CN101481615B - Fluorescent mixture, fluorescent lamp, backlight assembly and display device - Google Patents

Abstract

A fluorescent lamp includes a lamp body, a fluorescent layer and a discharge electrode. The lamp body has a discharge space in which ultraviolet light is generated. The fluorescent layer is formed on an inner surface of the lamp body to change the ultraviolet light into visible light. The discharge electrode is on an end portion of the lamp body to apply a voltage to the discharge space. A ratio of intensities of the visible light at wavelengths of about 545 nm and about 516 nm is about 1.32:1 to about 1.71:1. Therefore, color reproducibility and luminance may be improved.

Description

Fluorescent mixture, fluorescent lamp, backlight assembly and display device

technical field

The present disclosure relates to a fluorescent mixture, a fluorescent lamp, a backlight assembly having the fluorescent lamp, and a display device having the fluorescent lamp. More particularly, the present disclosure relates to a fluorescent mixture, a fluorescent lamp for a display device, a backlight assembly having the fluorescent lamp, and a display device having the fluorescent lamp.

Background technique

Liquid crystal display (LCD) devices generally have various characteristics such as thin thickness, light weight, low driving voltage, and low power consumption. Accordingly, LCD devices are widely used in various fields.

The LCD panel of the LCD device is a non-emissive display device that does not generate light. Accordingly, the LCD device includes a backlight assembly that supplies light to the LCD panel.

The backlight includes, for example, cold cathode fluorescent lamps (CCFLs), external electrode fluorescent lamps (EEFLs), flat fluorescent lamps (FFLs), light emitting diodes (LEDs) as light sources. Fluorescent lamps have various characteristics such as low price, long life, and low heat generation, and thus are widely used in LCD devices having various sizes.

A fluorescent lamp may include, for example, electrodes, a discharge space filled with a discharge gas, and a fluorescent layer. When a discharge voltage is applied to the electrodes, the discharge gas in the discharge space may generate excitons. In addition, when ultraviolet light generated by excitons is incident into the fluorescent layer, visible light may be generated from the fluorescent layer.

The fluorescent layer includes fluorescent material. Optical characteristics (eg, brightness, color, color reproducibility) of visible light may vary based on the kind of fluorescent material. Color reproducibility is a reference for determining colors displayed on an LCD device. Color reproducibility may be represented by a CIE1976 color coordinate system and an NTSC color coordinate system, and the color reproducibility may be a percentage of a color range with respect to the above color coordinates. However, when the fluorescent material has high color reproducibility, the brightness of visible light decreases. When the fluorescent material has high luminance, the color reproducibility of visible light decreases.

In addition, visible light may include red, green, and blue, and one of red, green, and blue may degrade brightness or color reproducibility of the remaining two of red, green, and blue. For example, the wavelength distribution of green light may be irregular, so that the color reproducibility of blue may deteriorate.

Contents of the invention

Exemplary embodiments of the present invention may provide a fluorescent mixture for a fluorescent lamp that improves brightness and color reproducibility.

Exemplary embodiments of the present invention may also provide a fluorescent lamp for a display device capable of improving brightness and color reproducibility.

Exemplary embodiments of the present invention may also provide a backlight assembly including the above fluorescent lamp.

Exemplary embodiments of the present invention may also provide a display device including the above fluorescent lamp.

According to an exemplary embodiment of the present invention, a fluorescent mixture is provided. Fluorescent mixtures include (Sr, Ca, Ba, Mg) ₅ (PO ₄ ) ₃ Cl:Eu ²⁺ (SCA), Y ₂ O ₃ :Eu ³⁺ (YOX) and (Ce, Mg, Zn)Al ₁₁ O ₁₉ :Mn ²⁺ (CMZ). SCA may be present in an amount of about 45% to about 50% by weight, YOX may be present in an amount of about 29% to about 33% by weight, and CMZ may be present in an amount of about 20% to about 26% by weight .

According to another exemplary embodiment of the present invention, a fluorescent lamp is provided. The fluorescent lamp includes a lamp body, a fluorescent layer and discharge electrodes. The lamp body has a discharge space, and ultraviolet light is generated in the discharge space. A fluorescent layer is formed on the inner surface of the lamp body to convert ultraviolet light into visible light. The fluorescent layer includes (Sr, Ca, Ba, Mg) ₅ (PO ₄ ) ₃ Cl:Eu ²⁺ (SCA), Y ₂ O ₃ :Eu ³⁺ (YOX) and (Ce, Mg, Zn)Al ₁₁ O ₁₉ : Fluorescent mixture of Mn ²⁺ (CMZ). A discharge electrode is on an end of the lamp body to apply a voltage to the discharge space.

The ratio of the intensity of visible light at a wavelength of about 445 nm to about 517 nm may be about 1:0.40 to about 1:0.50. The ratio of the intensity of visible light at a wavelength of about 445 nm to about 612 nm may be about 1:1.50 to about 1:1.60. A ratio of intensities of visible light at a wavelength of about 445 nm, at a wavelength of about 517 nm, and at a wavelength of about 612 nm may be about 1:0.46:1.55.

The fluorescent mixture may comprise: SCA, present in an amount of about 45% to about 50% by weight; YOX, present in an amount of about 29% to about 33% by weight; CMZ, present in an amount of about 20% to about 33% by weight; An amount of 26% is present. The fluorescent mixture may also comprise: SCA present in an amount of about 47% by weight; YOX present in an amount of about 31% by weight; CMZ present in an amount of about 22% by weight.

According to another exemplary embodiment of the present invention, a fluorescent lamp is provided. The fluorescent lamp includes a lamp body, a fluorescent layer and discharge electrodes.

The lamp body has a discharge space, and ultraviolet light is generated in the discharge space. A fluorescent layer is formed on the inner surface of the lamp body to convert ultraviolet light into visible light. A discharge electrode is on an end of the lamp body to apply a voltage to the discharge space. The ratio of the intensity of visible light at a wavelength of about 545 nm to about 516 nm is about 1.32:1 to about 1.71:1.

The ratio of the intensity of visible light at a wavelength of about 545 nm to about 516 nm may be about 1.32:1 to about 1.53:1. The ratio of the intensity of visible light at a wavelength of about 516 nm to about 579 nm may be about 1:0.25 to about 1:0.27. The ratio of intensities of visible light at a wavelength of about 545 nm, at a wavelength of about 516 nm, and at a wavelength of about 579 nm may be about 1.53:1:0.26.

The fluorescent layer may comprise a green fluorescent mixture comprising a primary green fluorescent material present in an amount of about 65% to about 85% by weight, a secondary green fluorescent material present in an amount of about 10% to about 20% by weight. An auxiliary green fluorescent material and a second auxiliary green fluorescent material are present in an amount of about 5% to about 15% by weight. The first auxiliary green fluorescent material may generate light with lower color reproducibility and higher brightness than the main green fluorescent material, and the second auxiliary green fluorescent material may generate light with higher color reproducibility and lower brightness than the main green fluorescent material. The primary green fluorescent material may include BaMgAl ₁₀ O ₁₇ :Eu ²⁺ , Mn ²⁺ . The first auxiliary green fluorescent material may include LaPO ₄ :Ce ³⁺ , Tb ³⁺ . The second auxiliary green fluorescent material may include a green fluorescent material selected from the group consisting of (Ce, Mg, Zn)Al ₁₁ O ₁₉ :Mn ²⁺ and BaMgAl ₁₄ O ₂₃ :Mn ²⁺ . For example, the second auxiliary green fluorescent material may include (Ce, Mg, Zn)Al ₁₁ O ₁₉ :Mn ²⁺ .

The main green fluorescent material may be about 75% by weight, the first auxiliary green fluorescent material may be about 15% by weight, and the second auxiliary green fluorescent material may be about 10% by weight.

The phosphor layer can be composed of Y ₂ O ₃ :Eu ³⁺ , Y(P,V)O ₄ :Eu ³⁺ , 3.5MgO·0.5MgF ₂ ·GeO ₂ :Mn ⁴⁺ , (Y,Gd)BO ₃ : A red fluorescent material selected from the group consisting of Eu ³⁺ , YVO ₄ :Eu ³⁺ , (Ce,Gd)MgB ₅ O ₁₀ :Mn ²⁺ and Y ₂ O ₂ S:Eu ³⁺ . The fluorescent layer can be composed of Sr ₅ (PO ₄ ) ₃ Cl:Eu ²⁺ , BaMgAl ₁₀ O ₁₇ :Eu ²⁺ , Sr ₂ Al ₆ O ₁₁ :Eu ²⁺ , BaAl ₈ O ₁₃ :Eu ²⁺ , CaMgSi ₂ A blue fluorescent material selected from the group consisting of O ₆ :Eu ²⁺ , (Sr, Ca, Ba, Mg) ₅ (PO ₄ ) ₃ Cl:Eu ²⁺ and Sr ₄ Al ₁₄ O ₂₅ :Eu ²⁺ .

According to an exemplary embodiment of the present invention, a backlight assembly is provided. The backlight assembly includes a fluorescent lamp, an optical member, and a receiving container.

A fluorescent lamp includes a lamp body, a fluorescent layer and a discharge electrode. The lamp body has a discharge space, and ultraviolet light is generated in the discharge space. A fluorescent layer is formed on the inner surface of the lamp body to convert ultraviolet light into visible light. The ratio of the intensity of visible light at a wavelength of about 516 nm to about 579 nm is about 1:0.25 to about 1:0.27. A discharge electrode is on an end of the lamp body to apply a voltage to the discharge space. The optical member is adjacent to the fluorescent lamp to enhance the optical characteristics of visible light. The receiving container houses the fluorescent lamp and the optical member.

According to another exemplary embodiment of the present invention, a display device is provided. The display device includes a fluorescent lamp, an optical member, a housing container, and a display panel.

A fluorescent lamp includes a lamp body, a fluorescent layer and a discharge electrode. The lamp body has a discharge space, and ultraviolet light is generated in the discharge space. A fluorescent layer is formed on the inner surface of the lamp body to convert ultraviolet light into visible light. The ratio of the intensity of visible light at a wavelength of about 545 nm to about 516 nm is about 1.32:1 to about 1.71:1. A discharge electrode is on an end of the lamp body to apply a voltage to the discharge space. The optical member is adjacent to the fluorescent lamp to enhance the optical characteristics of visible light. The receiving container houses the fluorescent lamp and the optical member. The display panel is disposed on the optical member to display an image using light passing through the optical member.

According to an exemplary embodiment of the present invention, there is provided a display device. The display device includes a fluorescent lamp, an optical member, and a display panel. A fluorescent lamp includes a lamp body, a fluorescent layer and a discharge electrode. The lamp body has a discharge space, and ultraviolet light is generated in the discharge space. A fluorescent layer is formed on the inner surface of the lamp body to convert ultraviolet light into visible light. The fluorescent layer includes (Sr, Ca, Ba, Mg) ₅ (PO ₄ ) ₃ Cl:Eu ²⁺ (SCA), Y ₂ O ₃ :Eu ³⁺ (YOX) and (Ce, Mg, Zn)Al ₁₁ O ₁₉ : Fluorescent mixture of Mn ²⁺ (CMZ). A discharge electrode is on an end of the lamp body to apply a voltage to the discharge space. The optical member is adjacent to the fluorescent lamp to enhance the optical characteristics of visible light. The display panel is disposed on the optical member, and includes a plurality of color filters that transmit light passing through the optical member to display images.

A ratio of intensities of visible light at a wavelength of about 445 nm, at a wavelength of about 517 nm, and at a wavelength of about 612 nm may be about 1:0.46:1.55. The color filters may include a red color filter that generates red light, a green color filter that generates green light, and a blue color filter that generates blue light. An intensity ratio of red light passing through the red color filter at a wavelength of about 445 nm to a wavelength of about 513 nm may be about 1:0.13 to about 1:0.14. In the CIE1931 color coordinate system, the color coordinates of green light may be about (0.23, 0.67) to about (0.24, 0.68). In the CIE1931 color coordinate system, the color coordinates of white light generated by mixing red, green, and blue lights may be about (0.29, 0.29) to about (0.30, 0.30).

The display panel may include an array substrate, an opposite substrate facing the array substrate, and a liquid crystal layer disposed between the array substrate and the opposite substrate.

Fluorescent lamps may include cold cathode fluorescent lamps, external electrode fluorescent lamps, flat type fluorescent lamps, and the like.

According to an exemplary embodiment of the present invention, a fluorescent lamp, a backlight assembly having the fluorescent lamp, and a display device having the fluorescent lamp include a fluorescent layer having a main green fluorescent material, a first auxiliary green fluorescent material, and a second auxiliary green fluorescent material, in which In the above-mentioned fluorescent lamps, green light is the key color for brightness compared with red light or blue light. Therefore, although the color reproducibility of the fluorescent lamp does not decrease, the brightness of the fluorescent lamp can be increased. In addition, the ratio among the main green fluorescent material, the first auxiliary green fluorescent material and the second auxiliary green fluorescent material is adjusted to optimize the color reproducibility and brightness of the backlight assembly.

In addition, green light generated from a green fluorescent mixture may not emit light having a blue wavelength, so that color reproducibility of blue light may not be deteriorated.

CMZ can be used for green fluorescent materials, so the color purity of light generated from the green fluorescent mixture can be improved.

In addition, the interference between the light generated by the green fluorescent material and the blue light or the interference between the light generated by the green fluorescent material and the red light is reduced, so that the color purity of the green light or the wavelength range comparable to that of the light generated by the green fluorescent material can be improved. The wavelength range is similar to the color purity of red light. Therefore, color reproducibility and image display quality of the display device can be improved.

Description of drawings

Exemplary embodiments of the present invention can be understood more particularly with reference to the accompanying drawings, in which:

FIG. 1 is an exploded perspective view illustrating a display device according to an exemplary embodiment of the present invention;

2 is a cross-sectional view showing a cold cathode fluorescent lamp (CCFL) shown in FIG. 1;

3 is an exploded perspective view illustrating a display device according to an exemplary embodiment of the present invention;

4 is a sectional view showing the external electrode fluorescent lamp shown in FIG. 3;

5 is a cross-sectional view illustrating a cold cathode fluorescent lamp according to an exemplary embodiment of the present invention;

6 is a graph showing the relationship between brightness and color reproducibility of cold cathode fluorescent lamps including various green fluorescent mixtures according to one example of the present invention;

7A to 7D are graphs showing the color reproducibility of red, green and blue light produced by cold cathode fluorescent lamps containing various green fluorescent mixtures according to one example of the present invention;

8 is a graph showing the relationship between the intensity and wavelength of light produced by CCFLs containing various green fluorescent mixtures according to one example of the present invention;

9 is a graph showing the relationship between the intensity and wavelength of light generated by cold cathode fluorescent lamps containing various green fluorescent mixtures according to a comparative example of the present invention;

10 is a graph showing the relationship between brightness and color reproducibility of CCFLs containing various green fluorescent mixtures according to a comparative example of the present invention;

11A to 11C are graphs showing color reproducibility of red, green and blue light when a green fluorescent mixture contains two kinds of green fluorescent materials according to a comparative example of the present invention;

12 is a graph showing a relationship between color reproducibility of blue light and a green fluorescent material according to a comparative example of the present invention;

13 is a graph showing the relationship between relative luminance and color reproducibility of cold cathode fluorescent lamps including various fluorescent materials according to another comparative example of the present invention;

14 is a graph showing the relationship between wavelength and intensity of light with good color reproducibility and poor color reproducibility;

15 is a graph showing color reproducibility of red light, green light, and blue light when a cold cathode fluorescent lamp includes a single green fluorescent material;

16 is a graph illustrating optical characteristics of fluorescent materials in a fluorescent mixture according to an exemplary embodiment of the present invention;

FIG. 17 is a graph showing optical characteristics of a fluorescent mixture comprising the fluorescent material shown in FIG. 16;

18 is a graph showing the optical characteristics of blue light produced by passing light having the spectrum of FIG. 17 through a blue color filter;

19 is a graph showing the optical characteristics of green light produced by passing the light having the spectrum of FIG. 17 through a green color filter;

FIG. 20 is a graph showing optical characteristics of red light generated by passing light having the spectrum of FIG. 17 through a red color filter;

21 is a graph showing a relationship between light having the spectrum of FIG. 17 and light of a comparative example with reference to the CIE1931 color coordinate system.

Detailed ways

In the following, the present invention will be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. However, this invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity.

It will be understood that when an element or layer is referred to as being "on," "connected to," or "coupled to" another element or layer, it can be directly on the other element or layer. or layer, directly connected or bonded to another element or layer, or intervening elements or layers may be present. In contrast, when an element or layer is referred to as being “directly on,” “directly connected to” or “directly coupled to” another element or layer, there are no intervening elements or layers present. Like reference numerals refer to like elements throughout. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It should be understood that although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections do not should be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present invention.

For the convenience of description, spatially relative terms may be used here, such as "below", "below", "below", "above", "above", etc., used to describe the relationship of one element or feature shown in the drawings to other elements or features. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of "above" and "beneath". The device may be otherwise positioned (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, singular forms are intended to include plural forms unless the context clearly dictates otherwise. It should also be understood that when the terms "comprises" and/or "comprises" are used in this specification, it means that the features, integers, steps, operations, elements and/or components exist, but does not exclude the existence or addition of one or more Various other features, integers, steps, operations, elements, components and/or groups thereof.

Exemplary embodiments of the invention are described herein with reference to cross-sectional illustrations that are schematic illustrations of idealized embodiments (and intermediate structures) of the invention. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances are to be expected. Thus, embodiments of the invention should not be construed as limited to the particular shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, an implanted region illustrated as a rectangle will, typically, have rounded or curved features and/or a gradient of implant concentration at its edges rather than a binary change from implanted to non-implanted region. Also, a buried region formed by implantation will result in some implantation in the region between the buried region and the surface through which the implantation takes place. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the actual shape of a region of a device and are not intended to limit the scope of the invention.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will also be understood that, unless expressly defined herein, terms (such as those defined in commonly used dictionaries) should be construed to have a meaning consistent with their meaning in the context of the relevant art, without being idealized or overly formal explain their meaning.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Green Fluorescent Mixture

The green fluorescent mixture includes about 65% to about 85% by weight of a primary green fluorescent material, about 10% to about 20% by weight of a first auxiliary green fluorescent material, and about 5% to about 15% by weight of a second green fluorescent material. 2. Auxiliary green fluorescent materials. Light generated by the first auxiliary green fluorescent material has lower color reproducibility and higher brightness than light generated by the main green fluorescent material. Light generated by the second auxiliary green fluorescent material has higher color reproducibility and lower brightness than light generated by the main green fluorescent material.

When the main green fluorescent material is less than about 65% by weight and the first auxiliary green fluorescent material is more than about 20% by weight, color reproducibility of green light decreases. When the main green fluorescent material is more than about 85% by weight and the first auxiliary green fluorescent material is less than about 10% by weight, the brightness of green light decreases.

When the second auxiliary green fluorescent material is less than about 5% by weight, color reproducibility of green light decreases. When the second auxiliary green fluorescent material is more than about 15% by weight, the brightness of green light decreases.

For example, the main green fluorescent material includes BaMgAl ₁₀ O ₁₇ :Eu ²⁺ , Mn ²⁺ (BAM:Mn), and the second auxiliary green fluorescent material includes (Ce, Mg, Zn)Al ₁₁ O ₁₉ :Mn ²⁺ (CMZ) . In addition, the first auxiliary green fluorescent material may include, for example, LaPO ₄ :Ce ³⁺ , Tb ³⁺ (LAP). For example, the main green fluorescent material may be about 75% by weight, and the first auxiliary green fluorescent material may be about 10% by weight. The second auxiliary green fluorescent material may be about 15% by weight.

Optionally, the primary green fluorescent material may include, for example, (Ba,Sr)MgAl ₁₀ O ₁₇ :Eu ²⁺ , Mn ²⁺ or BaMgAl ₁₄ O ₂₃ :Mn ²⁺ . In addition, the green fluorescent mixture may also include, for example, CeMgAl ₁₁ O ₁₅ :Tb ³⁺ (CAT), (Ce, Gd)MgB ₅ O ₁₀ :Tb ³⁺ (CBT), (Y, Gd)BO ₃ :Tb ³⁺ ( YBT) and so on.

The main green fluorescent material, the first auxiliary green fluorescent material, and the second auxiliary green fluorescent material may include, for example, BAM:Mn, LAP, and CMZ, respectively. Optionally, the main green fluorescent material, the first auxiliary green fluorescent material and the second auxiliary green fluorescent material may include, for example, various green fluorescent materials. For example, the main green fluorescent material may include (Ba, Sr)MgAl ₁₀ O ₁₇ :Eu ²⁺ , Mn ²⁺ , and the first auxiliary green fluorescent material may include CAT, YBT and the like. In addition, the second auxiliary green fluorescent material may include, for example, BaMgAl ₁₄ O ₂₃ :Mn ²⁺ .

Table 1 shows the optical properties of green fluorescent materials that can be used in green fluorescent mixtures.

[Table 1]

green fluorescent material peak wavelength color brightness color reproducibility life BAM:Mn 515 green ○ △ △ CMZ 518 green △ ○ △ LAP 545 green ○ x ○ CAT 545 green ○ x ○ CBT 545 green △ x △ YBT 545 green ○ x ○ (Ba, Sr)MgAl ₁₀ O ₁₇ :Eu ²⁺ , Mn ²⁺ 515 green ○ △ △ BaMgAl ₁₄ O ₂₃ :Mn ²⁺ 518 green x ○ △

Referring to Table 1, when ultraviolet light is irradiated on BAM:Mn, the peak wavelength of green light generated by BAM:Mn is about 515nm, the brightness is good, and the color reproducibility and lifespan are mediocre. When ultraviolet light is irradiated on the CMZ, the wavelength of the peak of the green light generated by the CMZ is about 518nm, the color reproducibility is good, and the luminance and lifespan are mediocre. When ultraviolet light is irradiated on the LAP, the peak wavelength of the green light generated by the LAP is about 545nm, the luminance and lifespan are good, and the color reproducibility is poor. When ultraviolet light is irradiated on the CAT, the peak wavelength of green light generated by the CAT is about 545nm, the luminance and lifespan are good, and the color reproducibility is poor. When ultraviolet light is irradiated on the CBT, the peak wavelength of the green light generated by the CBT is about 545nm, the luminance and lifespan are mediocre, and the color reproducibility is poor. When ultraviolet light is irradiated on the YBT, the peak wavelength of the green light generated by the YBT is about 545nm, the luminance and lifespan are good, and the color reproducibility is poor. When ultraviolet light is irradiated on (Ba, Sr)MgAl ₁₀ O ₁₇ :Eu ²⁺ , Mn ²⁺ , the peak of green light produced by (Ba, Sr)MgAl ₁₀ O ₁₇ :Eu ²⁺ , Mn ²⁺ The wavelength was about 515 nm, the luminance was good, and the color reproducibility and lifespan were fair. When ultraviolet light is irradiated on BaMgAl ₁₄ O ₂₃ :Mn ²⁺ , the peak wavelength of green light generated by BaMgAl ₁₄ O ₂₃ :Mn ²⁺ is about 518nm, the color reproducibility is good, the life is average, and the brightness is poor .

The color reproducibility of the cold cathode fluorescent lamp including each of the green fluorescent materials alternates with the luminance of the cold cathode fluorescent lamp including the green fluorescent materials. For example, a green fluorescent material with good color rendition has poor or mediocre brightness. Green fluorescent materials with good brightness have poor or mediocre color rendition.

Method for manufacturing green fluorescent mixture for display device

In the method of manufacturing a green fluorescent mixture for a display device of the present invention, a primary green fluorescent material comprising about 65% to about 85% by weight, a first auxiliary green fluorescent material comprising about 10% to about 20% by weight is prepared. A green fluorescent mixture of fluorescent material and about 5% to about 15% by weight of a second auxiliary green fluorescent material. Light generated by the first auxiliary green fluorescent material has lower color reproducibility and higher brightness than light generated by the main green fluorescent material. Light generated by the second auxiliary green fluorescent material has higher color reproducibility and lower brightness than light generated by the main green fluorescent material.

The main green fluorescent material, the first auxiliary green fluorescent material, and the second auxiliary green fluorescent material may be mixed using, for example, a stirrer, a mixer, a circulator, and the like.

Fluorescent mixtures for display devices

The fluorescent mixture of the present invention includes red fluorescent material, green fluorescent material and blue fluorescent material.

The blue fluorescent material may include, for example, (Sr, Ca, Ba, Mg) ₅ (PO ₄ ) ₃ Cl:Eu ²⁺ (SCA).

When the SCA is less than about 45% by weight, the brightness of blue light decreases, thereby reducing color reproducibility. When the SCA is more than about 50% by weight, the brightness of blue light increases and green light is disturbed, thereby reducing color reproducibility. Accordingly, fluorescent mixtures of the present invention may include from about 45% to about 50% by weight of blue fluorescent material. Preferably, the blue fluorescent material may be about 47% to about 50% by weight. For example, blue fluorescent material may be about 47% by weight.

The red fluorescent material may include, for example, Y ₂ O ₃ :Eu ³⁺ (YOX).

When YOX is less than about 29% by weight, the luminance of red light decreases, thereby reducing color reproducibility. When YOX is more than about 33% by weight, the brightness of red light increases, but the brightness of blue light and green light decreases, thereby reducing color reproducibility. Accordingly, fluorescent mixtures of the present invention may include from about 29% to about 33% by weight of red fluorescent material. Preferably, the red fluorescent material may be about 30% to about 33% by weight. For example, red fluorescent material may be about 31% by weight.

The green fluorescent material may include, for example, (Ce, Mg, Zn)Al ₁₁ O ₁₉ :Mn ²⁺ (CMZ).

When the CMZ is less than about 20% by weight, the luminance of green light decreases, thereby reducing color reproducibility. When the CMZ is more than about 26% by weight, the brightness of green light increases, but red light is disturbed, thereby degrading color reproducibility. Accordingly, fluorescent mixtures of the present invention may include from about 20% to about 26% by weight of a green fluorescent material. Preferably, the green fluorescent material may be about 20% to about 25% by weight. For example, green fluorescent material may be about 22% by weight.

To prepare the fluorescent mixture, about 45% to about 50% by weight of SCA, about 29% to about 33% by weight of YOX, and about 20% to about 20% by weight to About 26% CMZ mixed.

display device

FIG. 1 is an exploded perspective view illustrating a display device according to an exemplary embodiment of the present invention.

Referring to FIG. 1 , the display device includes a backlight assembly 800 , a mold frame 500 and a liquid crystal display (LCD) panel 600 .

The backlight assembly 800 includes a receiving container 100 , a light source module 200 , a light guide plate 300 and a reflective plate 400 . The backlight assembly 800 supplies light to the LCD panel 600 through an opening formed through the mold frame 500 .

The receiving container 100 includes a bottom plate 110 and side walls 120 . The side wall 120 protrudes from the side of the bottom plate 110 to form a receiving space.

The light source module 200 is accommodated in the accommodation space of the accommodation container 100 and adjacent to the side wall 120 .

The light source module 200 includes a cold cathode fluorescent lamp (CCFL) 210 , a lampshade 220 and a lamp wire 230 .

2 is a cross-sectional view showing the cold cathode fluorescent lamp (CCFL) shown in FIG. 1;

Referring to FIG. 2 , the CCFL 210 includes a discharge electrode 211 , a lamp body 213 , a fluorescent layer 215 and a protective layer 217 .

For example, the lamp body 213 includes a glass tube extending in the axial direction to form the discharge space 212 in the lamp body 213 . A discharge gas is filled in the discharge space 212 . For example, the discharge gas includes mercury gas, argon gas, and the like.

The discharge electrode 211 is at an end of the discharge space 212 and protrudes toward the outside of the lamp body 213 .

When a discharge voltage is applied to the discharge electrode 211, the discharge gas in the discharge space 212 is discharged to generate excitons from the discharge gas.

Ultraviolet light is generated by excitons in the discharge space. Ultraviolet light is irradiated onto the fluorescent layer 215 , and visible light is generated from the fluorescent layer 215 .

For example, the fluorescent layer 215 includes a red fluorescent material, a green fluorescent mixture, and a blue fluorescent material.

Examples of red fluorescent materials include, but are not limited to: YOX, YPV, MFG, YGB, YV, CMB, YOS, etc. These materials may be used alone or in combination.

The green fluorescent mixture includes about 65% to about 85% by weight of a primary green fluorescent material, about 10% to about 20% by weight of a first auxiliary green fluorescent material, and about 5% to about 15% by weight of a second green fluorescent material. 2. Auxiliary green fluorescent materials. The light generated by the first auxiliary green fluorescent material has lower color reproducibility and higher brightness than the light generated by the main green fluorescent material. Light generated by the second auxiliary green fluorescent material has higher color reproducibility and lower brightness than light generated by the main green fluorescent material. For example, the main green fluorescent material includes BAM:Mn, and the second auxiliary green fluorescent material includes, for example, CMZ. In addition, the first auxiliary green fluorescent material may include, for example, LAP. For example, the main green fluorescent material may be about 75% by weight, and the first auxiliary green fluorescent material may be about 10% by weight. The second auxiliary green fluorescent material may be about 15% by weight.

In FIG. 1 , the main green fluorescent material, the first auxiliary green fluorescent material, and the second auxiliary green fluorescent material include BAM:Mn, LAP, and CMZ, respectively. Optionally, the main green fluorescent material, the first auxiliary green fluorescent material and the second auxiliary green fluorescent material may include, for example, various green fluorescent materials. For example, the primary green fluorescent material may include (Ba,Sr)MgAl ₁₀ O ₁₇ :Eu ²⁺ , Mn ²⁺ , and the first auxiliary green fluorescent material may include CAT, YBT, and the like. In addition, the second auxiliary green fluorescent material may include, for example, BaMgAl ₁₄ O ₂₃ :Mn ²⁺ .

Examples of red fluorescent materials may include: Y ₂ O ₃ :Eu ³⁺ (YOX), Y(P,V)O ₄ :Eu ³⁺ (YPV), 3.5MgO·0.5MgF ₂ ·GeO ₂ :Mn ⁴⁺ ( MFG), (Y, Gd)BO ₃ :Eu ³⁺ (YGB), YVO ₄ :Eu ³⁺ (YV), (Ce,Gd)MgB ₅ O ₁₀ :Mn ²⁺ (CMB), Y ₂ O ₂ S :Eu ³⁺ (YOS) etc. These materials may be used alone or in combination.

Table 2 shows the optical properties of red fluorescent materials.

[Table 2]

red fluorescent material peak wavelength color brightness color reproducibility life YOX 613 red ○ △ ○ YPV 620 red △ ○ x MFG 623-664 red x ○ x YGB 611 red ○ △ ○ YV 620 red △ ○ x CMB 620 red x ○ △ YOS 626 red x ○ x

Referring to Table 2, when ultraviolet light is irradiated on YOX, the peak wavelength of red light generated by YOX is about 613nm, the brightness and lifespan are good, and the color reproducibility is fair. When ultraviolet light is irradiated on the YPV, the wavelength of the peak of the red light generated by the YPV is about 620nm, the color reproducibility is good, the brightness is mediocre, and the lifespan is poor. When ultraviolet light is irradiated on the MFG, the wavelength of the peak of the red light generated by the MFG is about 623nm to 664nm, the color reproducibility is good, and the brightness and lifespan are poor. When ultraviolet light is irradiated on YGB, the peak wavelength of red light generated by YGB is about 611 nm, the luminance and life are good, and the color reproducibility is fair. When the ultraviolet light was irradiated on the YV, the wavelength of the peak of the red light generated by the YV was about 620nm, the color reproducibility was good, the luminance was mediocre, and the lifespan was poor. When ultraviolet light was irradiated on the CMB, the wavelength of the peak of the red light generated by the CMB was about 620nm, the color reproducibility was good, the lifespan was mediocre, and the luminance was poor. When ultraviolet light is irradiated on the YOS, the wavelength of the peak of the red light generated by the YOS is about 626nm, the color reproducibility is good, and the luminance and lifespan are poor.

The color reproducibility of the cold cathode fluorescent lamp including each of the red fluorescent materials alternates with the luminance of the cold cathode fluorescent lamp including the red fluorescent materials. For example, a red fluorescent material with good color rendition has poor or mediocre luminance. A red fluorescent material with good brightness has poor or mediocre color rendition.

Examples of blue fluorescent materials may include Sr ₅ (PO ₄ ) ₃ Cl:Eu ²⁺ (SPE), BaMgAl ₁₀ O ₁₇ :Eu ²⁺ (BAM), Sr ₂ Al ₆ O ₁₁ :Eu ²⁺ (SAE), BaAl ₈ O ₁₃ :Eu ²⁺ (BAE), CaMgSi ₂ O ₆ :Eu ²⁺ (CMS), (Sr, Ca, Ba, Mg) ₅ (PO ₄ ) ₃ Cl:Eu ²⁺ (SCA), Sr ₄ Al ₁₄ O ₂₅ :Eu ²⁺ (SA), etc. These materials may be used alone or in combination.

Table 3 shows the optical properties of blue fluorescent materials.

[table 3]

blue fluorescent material peak wavelength color brightness color reproducibility life SPE 445 blue △ ○ △ BAM 450 blue ○ △ △ SAE 460 blue △ x ○ BAE 480 blue △ x ○ CMS 450 blue △ ○ ○ SCA 448 blue ○ ○ △ SA 490 blue ○ x ○

Referring to Table 3, when ultraviolet light is irradiated on the SPE, the peak wavelength of the blue light generated by the SPE is about 445nm, the color reproducibility is good, and the brightness and lifespan are fair. When ultraviolet light is irradiated on the BAM, the wavelength of the peak of the blue light generated by the BAM is about 450 nm, the luminance is good, and the color reproducibility and lifespan are mediocre. When ultraviolet light was irradiated on the SAE, the wavelength of the peak of the blue light generated by the SAE was about 460 nm, the lifespan was good, the luminance was mediocre, and the color reproducibility was poor. When ultraviolet light was irradiated on the BAE, the peak wavelength of the blue light generated by the BAE was about 480 nm, the lifespan was good, the luminance was mediocre, and the color reproducibility was poor. When ultraviolet light is irradiated on the CMS, the peak wavelength of blue light generated by the CMS is about 450 nm, the color reproducibility and lifespan are good, and the brightness is mediocre. When ultraviolet light is irradiated on the SCA, the peak wavelength of the blue light generated by the SCA is about 448nm, the luminance and color reproducibility are good, and the lifespan is mediocre. When ultraviolet light is irradiated on the SA, the wavelength of the peak of the blue light generated by the SA is about 490 nm, the luminance and lifespan are good, and the color reproducibility is poor.

The color reproducibility of the cold cathode fluorescent lamp including each of the blue fluorescent materials alternates with the luminance of the cold cathode fluorescent lamp including the blue fluorescent materials. For example, a blue fluorescent material with good color rendition has poor or mediocre luminance. Blue fluorescent materials with good brightness have poor or mediocre color rendition.

The brightness of light generated by the CCFL 210 is determined by mixing red light generated by a red fluorescent material, green light generated by a green fluorescent material, and blue light generated by a blue fluorescent material.

For example, the luminance of red light and blue light is inferior to that of green light so that the luminance of green light may be about 50% to 60% of the luminance of light generated by CCFL 210 . That is, the brightness of green light is greater than the sum of the brightness of red light and blue light.

Therefore, when the brightness of green light increases, the brightness of CCFL 210 increases.

When the cold cathode fluorescent lamp includes a single green fluorescent material, the color reproducibility of the green light decreases as the brightness of the green light increases.

However, in this exemplary embodiment, the green fluorescent mixture contains BAM:Mn having high luminance and used as the main green fluorescent material, CMZ having high color reproducibility and used as the second auxiliary green fluorescent material, and CMZ having high luminance and used as LAP of the first auxiliary green fluorescent material. Therefore, the color reproducibility and brightness of the green light generated from the cold cathode fluorescent lamp 210 are optimized.

For example, a red fluorescent material, a green fluorescent mixture, and a blue fluorescent material are mixed, and the mixed fluorescent material is coated on the inner surface of the lamp body 213 to form the fluorescent layer 215 .

A protective layer 217 is formed on the phosphor layer 215 to protect the phosphor layer 215 . For example, the protective layer 217 prevents mercury molecules of the discharge gas from adhering to the fluorescent layer 215 , thereby increasing the lifetime of the cold cathode fluorescent lamp 210 .

Referring again to FIG. 1 , the lampshade 220 includes a highly reflective material and covers the CCFL 210 to reflect light generated by the CCFL 210 toward the light guide plate 300 .

The lamp wire 230 is electrically connected to the discharge electrode 211 of the CCFL 210 to transmit a discharge voltage.

For example, the light source module 200 includes an edge light type light source module disposed on the side of the light guide plate 300 . Alternatively, the light source module may include a direct type light source module including a plurality of cold cathode fluorescent lamps arranged substantially parallel to each other.

The light guide plate 300 is disposed in the accommodation space of the accommodation container 100 , and the light source module 200 is on a side of the light guide plate 300 . The light guide plate 300 converts the line light generated by the light source module 200 into surface light to guide the surface light toward the LCD panel 600 .

The reflective plate 400 is disposed under the light guide plate 300 to reflect light leaked from the lower surface of the light guide plate 300 to the upper surface of the light guide plate 300 .

The mold frame 500 is at a peripheral portion of the light guide plate 300 , and the mold frame 500 includes a sidewall 520 and a stepped portion 510 .

The LCD panel 600 is disposed on the stepped portion 510 of the mold frame 500 , and the LCD panel 600 displays an image using light emitted from the light guide plate 300 . Alternatively, an electrophoretic display (EPD) panel may be used to display images.

According to the display device of FIGS. 1 and 2, the fluorescent layer 215 includes a green fluorescent mixture so that the brightness and color reproducibility of the cold cathode fluorescent lamp 210 are optimized to improve the image display quality of the display device.

FIG. 3 is an exploded perspective view illustrating a display device according to another exemplary embodiment of the present invention.

Referring to FIG. 3 , the display device includes a backlight assembly 850 and an LCD panel 600 .

The backlight assembly 850 includes the receiving container 100 , the side mold 450 and a plurality of external electrode fluorescent lamps 710 .

The receiving container 100 includes a bottom plate 110 and side walls 120 protruding from sides of the bottom plate 110 to form a receiving space.

The external electrode fluorescent lamps 710 are arranged substantially parallel to each other in the accommodation space of the accommodation container 100 .

Fig. 4 is a cross-sectional view showing the external electrode fluorescent lamp shown in Fig. 3 . The external electrode fluorescent lamp of FIG. 4 is the same as the fluorescent lamp of FIG. 2 except for the discharge electrode 711 . Therefore, the same reference numerals will be used to designate the same or similar parts as those described in FIG. 2, and any further explanation about the above elements will be omitted.

Referring to FIG. 4 , an external electrode fluorescent lamp 710 includes a discharge electrode 711 , a lamp body 713 , a fluorescent layer 715 and a protective layer 717 .

The discharge electrode 711 is on the end of the lamp body 713 and covers the outer surface of the lamp body 713 .

For example, a plurality of external electrode fluorescent lamps 710 are arranged substantially parallel to each other to form a direct type light source module.

Referring again to FIG. 3 , the side mold 450 is adjacent to a side of the receiving space of the receiving container 100 to fix the end of the external electrode fluorescent lamp 710 to the receiving container 100 .

The optical member 350 is on the side mold 450 to improve optical characteristics of light generated from the external electrode fluorescent lamp 710 . For example, the optical member 350 may include a diffusion plate 310 and an optical sheet 320 .

The diffusion plate 310 is supported by the side mold 450 and diffuses light generated from the external electrode fluorescent lamps 710 to improve brightness uniformity.

The optical sheet 320 is on the diffusion plate 310 and may include, for example, a prism sheet, a diffusion sheet, and the like. The prism sheet increases the front brightness of light passing through the diffusion plate 310 .

The LCD panel 600 is on the backlight assembly 850 and includes an array substrate 610 , an opposite substrate 620 , a liquid crystal layer 630 , an integrated printed circuit board 640 and a flexible circuit board 650 .

The liquid crystal layer 630 is disposed between the array substrate 610 and the opposite substrate 620 . The light transmittance of the liquid crystal layer 630 changes in response to an image signal applied to the array substrate 610 through the integrated printed circuit board 640 and the flexible circuit board 650 . Light generated from the backlight assembly 850 passes through the liquid crystal layer 630 having changed light transmittance to display images.

For example, the display device may further include a top frame 150 that fixes the LCD panel 600 to the backlight assembly 850 .

According to the present exemplary embodiment, the discharge electrode 711 is formed on the outer surface of the lamp body 713, so that the backlight assembly 850 having the external electrode fluorescent lamp 710 can be easily manufactured.

5 is a cross-sectional view illustrating a cold cathode fluorescent lamp according to another exemplary embodiment of the present invention. The CCFL of FIG. 5 is the same as that of FIG. 1 except for the fluorescent mixture. Therefore, the same reference numerals will be used to designate the same or similar components as those described in FIG. 1 , and any further explanation about the above elements will be omitted.

Referring to FIG. 5 , the cold cathode fluorescent lamp 410 includes a discharge electrode 411 , a lamp body 413 , a fluorescent layer 415 and a protective layer 417 .

The fluorescent layer 215 includes a fluorescent mixture. The fluorescent mixture comprises about 45% to about 50% by weight blue fluorescent material, about 29% to about 33% by weight red fluorescent material and about 20% to about 26% by weight green fluorescent material . For example, the blue fluorescent material may include (Sr, Ca, Ba, Mg) ₅ (PO ₄ ) ₃ Cl:Eu ²⁺ (SCA), and the red fluorescent material may include Y ₂ O ₃ :Eu ³⁺ (YOX). The green fluorescent material may include, for example, (Ce, Mg, Zn)Al ₁₁ O ₁₉ :Mn ²⁺ (CMZ).

For example, the fluorescent mixture may be coated on the inner surface of the lamp body 213 to form the fluorescent layer 215 .

Green fluorescent mixture for display devices

Example 1

To manufacture a fluorescent lamp, a green fluorescent mixture is coated on the inner surface of the lamp body to form a fluorescent layer. The fluorescent lamp of Example 1 is the same as that in FIG. 2 . Therefore, the same reference numerals will be used to designate the same or similar parts as those described in FIG. 2, and any further explanation about the above elements will be omitted.

In order to prepare the green fluorescent mixture, about 75% by weight of BAM:Mn as the main green fluorescent material, about 15% by weight of LAP as the first auxiliary green fluorescent material, and about 10% by weight of BAM as the second Two auxiliary green fluorescent materials are mixed in CMZ.

In this example, the powdery green fluorescent material is mixed and bonded with an adhesive, and the mixture is coated on the inner surface of the lamp body 215 .

Example 2

The fluorescent material of Example 2 is the same as that of Example 1 except for the ratio of the main green fluorescent material, the first auxiliary green fluorescent material, and the second auxiliary green fluorescent material. Therefore, any further explanation about the above elements will be omitted.

In order to prepare the green fluorescent mixture, about 65% by weight of BAM:Mn as the main green fluorescent material, about 15% by weight of LAP as the first auxiliary green fluorescent material, and about 20% by weight of BAM as the second Two auxiliary green fluorescent materials are mixed in CMZ.

Example 3

The fluorescent material of Example 3 is the same as that of Example 1 except for the ratio of the main green fluorescent material, the first auxiliary green fluorescent material, and the second auxiliary green fluorescent material. Therefore, any further explanation about the above elements will be omitted.

In order to prepare the green fluorescent mixture, about 80% by weight of BAM:Mn as the main green fluorescent material, about 10% by weight of LAP as the first auxiliary green fluorescent material, and about 10% by weight of LAP as the second Two auxiliary green fluorescent materials are mixed in CMZ.

Comparative example 1

To manufacture a fluorescent lamp, a green fluorescent mixture is coated on the inner surface of the lamp body to form a fluorescent layer. The fluorescent lamp of Comparative Example 1 was the same as that in FIG. 2 . Therefore, the same reference numerals will be used to designate the same or similar parts as those described in FIG. 2, and any further explanation about the above elements will be omitted.

In order to prepare the green fluorescent mixture, about 55% by weight of BAM:Mn as the main green fluorescent material, about 15% by weight of LAP as the first auxiliary green fluorescent material, and about 30% by weight of BAM as the second Two auxiliary green fluorescent materials are mixed in CMZ.

Comparative example 2

The fluorescent material of Comparative Example 2 was the same as that of Comparative Example 1 except for the ratio of the main green fluorescent material, the first auxiliary green fluorescent material, and the second auxiliary green fluorescent material. Therefore, any further explanation about the above elements will be omitted.

In order to prepare the green fluorescent mixture, about 45% by weight of BAM:Mn as the main green fluorescent material, about 15% by weight of LAP as the first auxiliary green fluorescent material, and about 40% by weight of BAM as the second Two auxiliary green fluorescent materials are mixed in CMZ.

Comparative example 3

To manufacture a fluorescent lamp, a green fluorescent mixture is coated on the inner surface of the lamp body to form a fluorescent layer. The fluorescent lamp of Comparative Example 3 was the same as that in FIG. 2 . Therefore, the same reference numerals will be used to designate the same or similar parts as those described in FIG. 2, and any further explanation about the above elements will be omitted.

To prepare a green fluorescent mixture, about 90% by weight of BAM:Mn and about 10% by weight of LAP were mixed.

Comparative example 4

The fluorescent material of Comparative Example 4 was the same as that of Comparative Example 3 except for the ratio of BAM:Mn and LAP. Therefore, any further explanation about the above elements will be omitted.

To prepare a green fluorescent mixture, about 85% by weight of BAM:Mn and about 15% by weight of LAP were mixed.

Comparative example 5

The fluorescent material of Comparative Example 5 was the same as that of Comparative Example 3 except for the ratio of BAM:Mn and LAP. Therefore, any further explanation about the above elements will be omitted.

To prepare a green fluorescent mixture, about 80% by weight of BAM:Mn and about 20% by weight of LAP were mixed.

Comparative example 6

The fluorescent material of Comparative Example 6 was the same as that of Comparative Example 3 except for the ratio of BAM:Mn and LAP. Therefore, any further explanation about the above elements will be omitted.

To prepare a green fluorescent mixture, about 70% by weight of BAM:Mn and about 30% by weight of LAP were mixed.

Comparative example 7

The fluorescent material of Comparative Example 7 was the same as that of Comparative Example 3 except for the ratio of BAM:Mn and LAP. Therefore, any further explanation about the above elements will be omitted.

To prepare a green fluorescent mixture, about 50% by weight of BAM:Mn and about 50% by weight of LAP were mixed.

test 1

6 is a graph showing the relationship between luminance and color reproducibility of cold cathode fluorescent lamps including various green fluorescent mixtures according to one example of the present invention. The green fluorescent mixture of FIG. 6 is the same as that in Example 1 and Example 2. Therefore, any further explanation about the above elements will be omitted.

Referring to FIG. 6, the green fluorescent mixture includes BAM:Mn as a main green fluorescent material, LAP as a first auxiliary green fluorescent material, and CMZ as a second auxiliary green fluorescent material.

In this experiment, the proportion of LAP was fixed at approximately 15% by weight and the proportion of CMZ was varied. The color reproducibility of the cold cathode fluorescent lamp including a red fluorescent material to generate red light, a green fluorescent mixture to generate green light, and a blue fluorescent mixture to generate blue light is about 98.1%.

In FIG. 6 , when the LAP was about 15%, the luminance was increased and the color reproducibility was decreased compared to the green fluorescent material including pure BAM:Mn.

When the green fluorescent mixture contained about 75% by weight of BAM:Mn, about 15% by weight of LAP, and about 10% by weight of CMZ, the color reproducibility was 98.1% and the brightness was about 540 nit.

When the green fluorescent mixture contained about 65% by weight of BAM:Mn, about 15% by weight of LAP, and about 20% by weight of CMZ, the color reproducibility was 99.2% and the brightness was about 520nit.

When the green fluorescent mixture contained about 55% by weight of BAM:Mn, about 15% by weight of LAP, and about 30% by weight of CMZ, the color reproducibility was 100.2% and the brightness was about 490 nit.

When the green fluorescent mixture contained about 45% by weight of BAM:Mn, about 15% by weight of LAP, and about 40% by weight of CMZ, the color reproducibility was 101.8% and the brightness was about 460 nit.

In this test, the color reproducibility of red light and blue light generated by the red fluorescent material and the blue fluorescent material was about 98.1%. Therefore, when the color reproducibility of green light generated by the green fluorescent mixture is greater than about 98.1%, the color reproducibility of green light is sufficient.

Therefore, the optimal ratio of the green fluorescent material maintaining a color rendition greater than about 98.1% is: about 75% by weight of BAM:Mn, about 15% by weight of LAP, and about 10% by weight of CMZ.

When the color reproducibility of red light and blue light changes, the ratio of CMZ may also be changed based on the change of color reproducibility of red light and blue light. For example, the proportion of CMZ may be about 5% to about 15%. Alternatively, when the color reproducibility of red light and blue light is greater than about 100%, the content of CMZ may be greater than about 30%.

7A is a graph showing color reproducibility of red, green, and blue lights of cold cathode fluorescent lamps including various green fluorescent mixtures according to an example of the present invention. In FIG. 7A , the blue fluorescent material contains SCA, and the red fluorescent material contains YOX.

Referring to curve 'a' in Figure 7A, when the green fluorescent material contains pure BAM:Mn, the color coordinates (u', v') of red, green and blue light are (0.469, 0.524), (0.078, 0.567) respectively and (0.163, 0.181). The brightness of curve 'a' is set to 100% of the relative brightness of curve 'b' and curve 'c'. With respect to the CIE1976 color coordinate system, the color reproducibility of the curve 'a' is about 98.1%.

With reference to the curve 'b' of Figure 7A, when the green fluorescent material comprises about 85% by weight of BAM:Mn and about 15% by weight of LAP, the color coordinates (u', v' of red, green and blue light ) are (0.455, 0.522), (0.091, 0.565) and (0.168, 0.179), respectively. The relative brightness of curve 'b' is about 112%. Relative to the CIE1976 color coordinate system, the color reproducibility of the curve 'b' is about 90.9%.

Referring to curve 'c' of FIG. 7A, when the green fluorescent material contains about 75% by weight of BAM:Mn, about 15% by weight of LAP and about 10% by weight of CMZ, red, green and blue light The color coordinates (u', v') of are (0.464, 0.523), (0.090, 0.567) and (0.169, 0.170), respectively. Curve 'c' has a relative brightness of 108%. With respect to the CIE1976 color coordinate system, the color reproducibility of the curve 'c' is 97.4%.

FIG. 7B is a graph showing a portion 'A' of FIG. 7A corresponding to a green region of CIE1976 color coordinates.

Referring to FIG. 7B, when the green fluorescent material includes pure BAM:Mn corresponding to curve 'a', the color reproducibility of green light is better than that of curve 'b' and curve 'c'. When corresponding to the curve 'b', the green fluorescent material comprises about 85% by weight of BAM:Mn and about 15% by weight of LAP, the color reproducibility of green light is better than that of the curve 'a' or the curve 'c' Color reproduction is poor. When corresponding to the curve 'c', the green fluorescent material comprises about 75% by weight of BAM:Mn, about 15% by weight of LAP and about 10% by weight of CMZ, the color reproducibility ratio curve of green light The color reproducibility of 'b' is good and worse than that of curve 'a'. Although the color reproducibility of curve 'a' is better than that of curve 'b' and curve 'c', the luminance of pure BAM:Mn corresponding to curve 'a' is higher than that of curve 'b' and curve 'c' Brightness is poor.

FIG. 7C is a graph showing part 'B' of FIG. 7A corresponding to the blue region of the CIE1976 color coordinate system.

7C, when corresponding to the curve 'c', the green fluorescent material contains about 75% by weight of BAM:Mn, about 15% by weight of LAP and about 10% by weight of CMZ, the color of blue light The reproducibility is better than the color reproducibility of curve 'a' and curve 'b'. When the green fluorescent material includes pure BAM:Mn corresponding to curve 'a', the color reproducibility of blue light is worse than that of curve 'b' or curve 'c'. When the green fluorescent material contains about 85% by weight of BAM:Mn and about 15% by weight of LAP corresponding to curve 'b', the color reproducibility of blue light is better than that of curve 'a' and Color reproducibility is worse than curve 'c'.

FIG. 7D is a graph illustrating a portion 'C' of FIG. 7A corresponding to a red region of the CIE1976 color coordinate system.

Referring to FIG. 7D , when the green fluorescent material includes pure BAM:Mn corresponding to curve 'a', the color reproducibility of red light is better than that of curve 'b' and curve 'c'. When the green fluorescent material contains about 85% by weight of BAM:Mn and about 15% by weight of LAP corresponding to curve 'b', the color reproducibility of red light is higher than that of curve 'a' or curve 'c' Color reproduction is poor. When corresponding to the curve 'c', the green fluorescent material comprises about 75% by weight of BAM:Mn, about 15% by weight of LAP and about 10% by weight of CMZ, the color reproducibility ratio curve of red light The color reproducibility of 'b' is good and worse than that of curve 'a'.

7A to 7D, when corresponding to the curve 'c', the green fluorescent material contains about 75% by weight of BAM:Mn, about 15% by weight of LAP and about 10% by weight of CMZ, by The color reproducibility of the light produced by the green fluorescent material comprising BAM:Mn, LAP and CMZ is substantially the same as that of the light produced by the green fluorescent material comprising pure BAM:Mn, and is similar to that produced by the green fluorescent material comprising pure BAM:Mn. Compared with the brightness of the light generated by the green fluorescent material, the brightness of the curve 'c' is increased by about 8%. In addition, when the green fluorescent material contains about 75% by weight of BAM:Mn, about 15% by weight of LAP, and about 10% by weight of CMZ corresponding to the curve 'c', by including BAM:Mn, The brightness of the light produced by the green fluorescent material of LAP and CMZ is substantially the same as that of the light produced by the green fluorescent material comprising BAM:Mn and LAP, and is similar to that of the light produced by the green fluorescent material comprising BAM:Mn and LAP. The color reproducibility of the curve 'c' is improved by about 6.3% compared to the color reproducibility.

test 2

8 is a graph showing the relationship between intensity and wavelength of light generated by CCFLs containing various green fluorescent mixtures according to one example of the present invention. The green fluorescent mixture of FIG. 8 is the same as that in Example 1 and Example 3. Therefore, any further explanation about the above elements will be omitted.

Referring to FIG. 8 , the green fluorescent mixture includes BAM:Mn as a main green fluorescent material, LAP as a first auxiliary green fluorescent material, and CMZ as a second auxiliary green fluorescent material. In this experiment, the proportion of CMZ was fixed at approximately 10% by weight and the proportion of LAP was varied.

When corresponding to the curve 'd', the green fluorescent mixture contains about 80% by weight of BAM:Mn, about 10% by weight of LAP and about 10% by weight of CMZ, the first peak d1, the second peak The wavelengths of d2 and the third peak d3 are about 545nm, about 516nm and about 579nm, respectively, and the intensities of the first peak d1, the second peak d2 and the third peak d3 are about 50705a.u., about 38455a.u. and Circa 9064a.u. The ratio between the intensities of the first peak d1, the second peak d2, and the third peak d2 is about 1:0.76:0.18. When the intensity of the second peak d2 is set to 1, the ratio between the intensities of the first peak d1, the second peak d2, and the third peak d2 is about 1.32:1:0.25.

When corresponding to the curve 'e', the green fluorescent mixture contains about 75% by weight of BAM:Mn, about 15% by weight of LAP and about 10% by weight of CMZ, the first peak e1, the second peak The wavelengths of e2 and the third peak e3 are about 545nm, about 516nm and about 579nm, respectively, and the intensities of the first peak e1, the second peak e2 and the third peak e3 are about 55641a.u., about 36400a.u. and Circa 9339a.u. The ratio between the intensities of the first peak e1, the second peak e2, and the third peak e3 is about 1:0.65:0.17. When the intensity of the second peak e2 is set to 1, the ratio among the intensities of the first peak e1, the second peak e2, and the third peak e3 is about 1.53:1:0.26. Accordingly, a ratio between intensities of the first peak e1, the second peak e2, and the third peak e3 may be about 1.32:1:0.25 to about 1.53:1:0.26.

As the proportion of LAP increases, the intensity of the first peaks d1 and e1 increases. As the ratio of BAM:Mn increases, the intensity of the second peaks d2 and e2 increases. Therefore, the intensity of the third peaks d3 and e3 corresponds to the proportion of CMZ.

In this experiment, the intensity of the first peak d1 and e1, the intensity of the second peak d2 and e2 and the intensity of the third peak d3 and e3 can be increased with the ratio of LAP, BAM:Mn and CMZ, respectively. When the proportion of CMZ is about 10% by weight and the proportion of LAP is about 10% to 20% by weight, the ratio between the intensities of the first peaks d1 and e1 and the intensities of the second peaks d2 and e2 may be About 1.32:1 to about 1.71:1. In addition, the ratio of BAM:Mn is about 70% to about 80%, and the ratio between the intensity of the second peaks d2 and e2 and the intensity of the third peaks d3 and e3 may be about 1:0.25 to 1:0.27.

In this experiment, the CMZ prevented the interference of blue light caused by the LAP.

Comparative test 1

9 is a graph showing the relationship between the intensity and wavelength of light generated by cold cathode fluorescent lamps containing various green fluorescent mixtures according to a comparative example of the present invention. The green fluorescent mixture of FIG. 9 is the same as those in Comparative Example 3 to Comparative Example 7. Therefore, any further explanation about the above elements will be omitted.

Referring to FIG. 9, when the green fluorescent mixture contains about 90% by weight of BAM:Mn and about 10% by weight of LAP corresponding to the curve 'a', the wavelengths of the first peak and the second peak are about 515nm, respectively and about 545 nm, and the intensities of the first peak and the second peak are about 2.08 a.u. and about 1.40 a.u., respectively.

When corresponding to the curve 'b', the green fluorescent mixture comprises about 70% by weight of BAM:Mn and about 30% by weight of LAP, the wavelengths of the first peak and the second peak are respectively about 545nm and about 515nm, And the intensities of the first peak and the second peak are about 2.10 a.u. and about 1.60 a.u., respectively.

When corresponding to the curve 'c', the green fluorescent mixture comprises about 50% by weight of BAM:Mn and about 50% by weight of LAP, the wavelengths of the first peak and the second peak are respectively about 545nm and about 515nm, And the intensities of the first peak and the second peak are about 2.8 a.u. and about 1.12 a.u., respectively.

When BAM:Mn is mixed with LAP to form a green fluorescent mixture, the maximum intensity of green light generated from the green fluorescent mixture decreases, so that the bandwidth of green light increases. In addition, the brightness of green light increases. However, when the ratio of LAP is greater than about 50% by weight, the intensity of green light is concentrated on a wavelength of about 545 nm, so that the bandwidth of green light is narrowed. Therefore, color reproducibility decreases.

10 is a graph showing the relationship between brightness and color reproducibility of cold cathode fluorescent lamps including various green fluorescent mixtures according to a comparative example of the present invention.

Referring to FIG. 10 , when the ratio of BAM:Mn increases, brightness decreases and color reproducibility increases. However, when the content of LAP increases, color reproducibility decreases and brightness increases. When the ratio of LAP is about 10% to about 20% by weight, brightness and color reproducibility of green light are optimized.

FIG. 11A is a graph showing color reproducibility of red, green, and blue lights when a green fluorescent mixture contains two kinds of green fluorescent materials according to a comparative example of the present invention. FIG. 11B is a graph illustrating a portion 'A1' of FIG. 11A corresponding to a green area. FIG. 11C is a graph illustrating a portion 'B1' of FIG. 11A corresponding to a blue area.

Referring to Figures 11A to 11C, when corresponding to curve b1, the green fluorescent mixture contains about 10% by weight of LAP or corresponding to curve c1, when the green fluorescent mixture contains about 20% by weight of LAP, and by containing pure BAM : Compared with the green light produced by the fluorescent mixture of Mn as the green fluorescent mixture and the blue light, the color reproducibility of the green light of the curve b1 or the curve c1 is poor, but the color reproducibility of the blue light is good.

FIG. 12 is a graph showing a relationship between color reproducibility of blue light and a green fluorescent material according to a comparative example of the present invention.

Referring to FIG. 12, when SCA is used as a blue fluorescent material generating blue light, the blue light has a wide bandwidth around a peak having a wavelength of about 448nm.

When BAM:Mn is used as a green fluorescent material that generates green light, the green light has a wide bandwidth around a peak at a wavelength of about 515 nm.

When LAP is used as a green fluorescent material generating green light, the green light has a maximum peak at a wavelength of about 545nm, a second peak at a wavelength of about 576nm, and a third peak at a wavelength of about 490nm. A third peak having a wavelength of about 490 nm may overlap with a band of blue light, so that blue light may have multiple peaks.

Therefore, when LAP is used as a green fluorescent material, blue light may be disturbed, so that the color reproducibility of blue light may be reduced.

Comparative example 2

13 is a graph showing the relationship between relative luminance and color reproducibility of cold cathode fluorescent lamps including various fluorescent materials according to another comparative example of the present invention. In FIG. 13, the fluorescent layer of the cold cathode fluorescent lamp contains a single green fluorescent material.

The CCFL of FIG. 13 is the same as that of FIG. 2 except for the green fluorescent mixture. Therefore, the same reference numerals will be used to designate the same or similar parts as those described in FIG. 2, and any further explanation about the above elements will be omitted.

Table 4 shows the red, green and blue fluorescent materials used in the CCFL of FIG. 13.

[Table 4]

serial number blue fluorescent material green fluorescent material red fluorescent material 1 SCA BAM:Mn YVO 2 SCA BAM:Mn YOX 3 SCA CMZ YVO 4 SCA ZnSi YVO 5 SCA CMZ YOX 6 SCA ZnSi YOX 7 SCA CMZ YOS

Referring to FIG. 13 and Table 4, when a single green fluorescent material is used for the cold cathode fluorescent material, the color reproducibility of the cold cathode fluorescent lamp including the single green fluorescent material alternates with the brightness of the cold cathode fluorescent lamp including the single green fluorescent material . For example, a green fluorescent material with good color rendition has poor or mediocre brightness. Green fluorescent materials with good brightness have poor or mediocre color rendition.

14 is a graph showing the relationship between the wavelength and intensity of light with good color reproducibility and light with poor color reproducibility.

Referring to FIG. 14 , curve 'a' represents light with high color reproducibility, which has a wide band, a peak, and a narrow full width at half maximum (FWHM). A band is the width of the spectrum of light. The half-peak width is the width between wavelengths having half the amplitude of the peak. When the band is narrow and the number of peaks increases, color reproducibility decreases.

Table 5 shows color reproducibility in the CIE1976 color coordinate system when a single green fluorescent material is used for a fluorescent mixture.

[table 5]

FIG. 15 is a graph showing color reproducibility of red, green, and blue lights when a cold cathode fluorescent lamp includes a single green fluorescent material. In Fig. 15, the light produced by the lamps of Table 5 is shown in the CIE1976 color coordinate system (u', v').

Referring to Table 5 and FIG. 15, when YOX, LAP, and BAM are used as red, green, and blue fluorescent materials, the color reproducibility of curve 'a' corresponding to lamp 21 (Table 5) with low color reproducibility is about 72%. The relative brightness of curve 'a' is set to 100%.

When YOX, LAP, and SCA were used as red, green, and blue fluorescent materials, the color reproducibility of curve 'b' corresponding to the high color reproducibility lamp 22 (Table 5) was about 92%.

The color rendition of the lamp with high color rendition is about 20% higher than that of the lamp with low color rendition, and the brightness of the lamp with high color rendition is about 15% lower than that of the lamp with low color rendition. Furthermore, in FIG. 15 , the blue color B2 generated by the lamp 22 with high color reproducibility is shifted upward compared with the blue color B1 generated by the lamp 21 with low color reproducibility. Therefore, the color reproducibility of blue light decreases.

Fluorescent mixtures for display devices

Example 1

To manufacture a fluorescent lamp, a fluorescent mixture is coated on the inner surface of the lamp body to form a fluorescent layer. The fluorescent lamp of this exemplary embodiment is the same as that in FIG. 5 . Therefore, the same reference numerals will be used to designate the same or similar parts as those described in FIG. 5, and any further explanation about the above elements will be omitted.

To prepare a fluorescent mixture, about 47% by weight of SCA as a blue fluorescent material, about 31% by weight of YOX as a red fluorescent material, and about 22% by weight of CMZ as a green fluorescent material were mixed.

In this example, fluorescent materials in powder form are mixed and bonded with an adhesive, and the mixture is coated on the inner surface of the lamp body 213 (shown in FIG. 2 ).

Example 2

To prepare the fluorescent mixture, about 48% by weight of SCA, about 30% by weight of YOX, and about 22% by weight of CMZ were mixed.

Example 3

To prepare the fluorescent mixture, about 45% by weight of SCA, about 29% by weight of YOX, and about 26% by weight of CMZ were mixed.

Comparative example

To manufacture a fluorescent lamp, a fluorescent mixture is coated on the inner surface of the lamp body to form a fluorescent layer. The fluorescent lamp of this exemplary embodiment is the same as that in FIG. 2 . Therefore, the same reference numerals will be used to designate the same or similar parts as those described in FIG. 2, and any further explanation about the above elements will be omitted.

To prepare a fluorescent mixture, about 47.5 g of SCA as a blue fluorescent material, about 31.2 g of YOX as a red fluorescent material, and about 21.3 g of BaMgAl ₁₀ O ₁₇ : Eu ²⁺ , Mn ²⁺ as a green fluorescent material (BAM:Mn) mixed.

Optical Properties of Fluorescent Mixtures

FIG. 16 is a graph illustrating optical characteristics of fluorescent materials in a fluorescent mixture according to another exemplary embodiment of the present invention.

Referring to FIG. 16 , the light generated by the fluorescent lamp including the SCA coated on the inner surface of the lamp body (corresponding to curve 'a') has a maximum peak at a wavelength of about 445 nm, and has a broad spectrum covering the blue wavelength range.

Light generated by a fluorescent lamp comprising YOX coated on the inner surface of the lamp body (corresponding to curve 'b') has a maximum peak at a wavelength of about 612 nm, and has a spectrum that includes random distribution peaks.

Light generated by a fluorescent lamp including CMZ coated on the inner surface of the lamp body (corresponding to curve 'c') has a maximum peak at a wavelength of about 517 nm, and has a broad spectrum covering the green wavelength range.

Light generated by a fluorescent lamp containing mercury gas injected into the discharge space of the lamp body (corresponding to curve 'h') has a maximum peak at a wavelength of about 610 nm, a second peak at a wavelength of about 436 nm, and a second peak at a wavelength of about 546 nm. three peaks. The largest peak corresponds to red light. The second peak corresponds to blue light. The third peak corresponds to green light.

FIG. 17 is a graph showing optical characteristics of a fluorescent mixture including the fluorescent material shown in FIG. 16 . In FIG. 17, a fluorescent mixture was prepared by mixing 47.9g of SCA, 31.2g of YOX, and 22.4g of CMZ, and coated the mixture on the inner surface of the lamp body 213 with an adhesive.

17, the spectrum of light produced by the fluorescent mixture has a peak at a wavelength of about 152382 a.u. at a wavelength of about 436 nm, a peak at about 102015 a.u. at a wavelength of about 445 nm, and a peak at a wavelength of about 102015 a.u. There is a peak at 517 nm with an intensity of about 46588 a.u., a peak at a wavelength of about 546 nm with an intensity of about 54828 a.u. and a wavelength of about 612 nm with an intensity of about 158600 a.u.

The peak at about 436 nm and the peak at about 445 nm are in the blue wavelength range. The peak at about 517 nm and the peak at about 546 nm are in the green wavelength range. The peak at about 612 is in the red wavelength range.

The peak at approximately 445 nm corresponds to the light generated by the SCA (corresponding to curve 'a' in Figure 16). The peak at approximately 517 nm corresponds to light generated by the CMZ (corresponding to curve 'c' in Figure 16). The peak at approximately 612 nm corresponds to light generated by YOX (corresponding to curve 'b' in Figure 16). The peak at about 436 nm and the peak at about 546 nm correspond to light generated by mercury gas (corresponding to curve 'h' in Figure 16).

The ratio between the intensity at about 445 nm, the intensity at about 517 nm and the intensity at about 612 nm is about 1:0.46:1.55. In another exemplary embodiment, the ratio between the intensity at about 445 nm and the intensity at about 517 nm may be about 1:0.4 to about 1:0.5, and the intensity at about 445 nm and the intensity at about 612 nm The ratio between the intensities may be about 1:1.50 to about 1:1.60.

FIG. 18 is a graph showing optical characteristics of blue light generated by light having the spectrum of FIG. 17 passing through a blue color filter.

Referring to FIG. 18, the spectrum of the light produced by the fluorescent mixture and passed through the blue color filter has a peak at a wavelength of about 436 nm with an intensity of about 107261 a.u., and a peak with an intensity of about 77811 a.u. peak. In addition, the spectrum of light passing through the blue color filter has a peak at a wavelength of about 513 nm with an intensity of about 10187 a.u., which is adjacent to the green wavelength range. In FIG. 18, the ratio between the intensity at about 445 nm and the intensity at about 513 nm may be about 1:0.131. In another exemplary embodiment, the ratio between the intensity at about 445 nm and the intensity at about 513 nm may be about 1:0.13 to about 1:0.14.

FIG. 19 is a graph showing optical characteristics of green light generated by light having the spectrum of FIG. 17 passing through a green color filter.

Referring to FIG. 19, the spectrum of light generated by the fluorescent mixture and passed through the green color filter has a peak at a wavelength of about 517nm with an intensity of about 38810a.u., and a peak at a wavelength of about 546nm with an intensity of about 44865a.u. .

FIG. 20 is a graph showing optical characteristics of red light generated by light having the spectrum of FIG. 17 passing through a red color filter.

Referring to FIG. 20, the spectrum of light generated from the fluorescent mixture and passed through the red color filter has a peak at a wavelength of about 612 nm with an intensity of about 137212 a.u.

Table 6 represents the color coordinates of the light generated by the fluorescent mixture according to the exemplary embodiment of the present invention. In Table 6, the fluorescent mixture containing SCA, YOX and CMZ corresponding to Example 1 and the fluorescent mixture containing SCA, YOX and BAM:Mn corresponding to Comparative Example were tested.

[Table 6]

21 is a graph showing a relationship between light having the spectrum of FIG. 17 and light of a comparative example with reference to the CIE1931 color coordinate system.

Referring to Figure 21 and Table 6, the color reproducibility 'a' of the red, green and blue light produced by the fluorescent mixture containing SCA, YOX and CMZ is different from the red, green and green light produced by the fluorescent mixture containing SCA, YOX and BAM:Mn It is basically the same as the color reproducibility 'b' of blue light.

When the CMZ corresponding to the curve 'a' is used as the green fluorescent material of the fluorescent mixture, the color coordinates of the red, green and blue light relative to the CIE1931 color coordinate system 'c' are about (0.6494, 0.3267), about ( 0.1501, 0.0650) and approximately (0.2311, 0.6773). Alternatively, with respect to the CIE1931 color coordinate system 'c', the color coordinates of red light may be about (0.64, 0.32) to about (0.65, 0.33), and the color coordinates of blue light may be about (0.15, 0.06) to about (0.16, 0.07), the color coordinates of the green light may be about (0.23, 0.67) to about (0.24, 0.68).

Table 7 shows the brightness, color reproducibility and white coordinates of the light generated by the fluorescent mixtures of Table 6. In Table 7, the luminance was relatively determined with respect to the comparative example, and the white coordinates are the color coordinates of white light generated by mixing red, green, and blue lights generated from the fluorescent mixture.

[Table 7]

fluorescent mixture brightness color reproducibility white coordinates SCA-YOX-BAM:Mn 100.0% 90.6% (0.2763, 0.2811) SCA-YOX-CMZ 91.9% 89.9% (0.2949, 0.2924)

Referring to Table 7, white coordinates of white light generated by mixing red, green, and blue lights are about (0.2949, 0.2924). The brightness of the white light generated from the fluorescent mixture containing CMZ as the green fluorescent material was lower than that of the white light generated from the fluorescent mixture containing BAM:Mn as the green fluorescent material. However, the color reproducibility of white light produced by the fluorescent mixture containing CMZ as the green fluorescent material was substantially the same as that of the white light produced by the fluorescent mixture containing BAM:Mn as the green fluorescent material, and the color reproducibility of white light produced by the fluorescent mixture containing CMZ as the green fluorescent material The white coordinates of the white light produced by the fluorescent mixture of materials are substantially the same as those produced by the fluorescent mixture comprising BAM:Mn as the green fluorescent material. Alternatively, the white color coordinates of the white light may be about (0.29, 0.29) to about (0.30, 0.30).

According to an exemplary embodiment of the present invention, a fluorescent lamp, a backlight assembly having the fluorescent lamp, and a display device having the fluorescent lamp include a fluorescent layer having a main green fluorescent material, a first auxiliary green fluorescent material, and a second auxiliary green fluorescent material, in which In the above-mentioned fluorescent lamps, green light is the key color for brightness compared with red light or blue light. Therefore, although the color reproducibility of the fluorescent lamp of the exemplary embodiment of the present invention is not lowered, the luminance of the fluorescent lamp may be increased. In addition, the ratio among the main green fluorescent material, the first auxiliary green fluorescent material and the second auxiliary green fluorescent material is adjusted to optimize the color reproducibility and brightness of the backlight assembly.

In addition, green light generated from the green fluorescent mixture may not emit light having a wavelength of blue light, so that color reproducibility of blue light may not be deteriorated.

In addition, since CMZ is used as a green fluorescent material, the color purity of light generated from a fluorescent mixture including CMZ can be improved. In addition, interference between green light and blue light having similar wavelength ranges or interference between red light and green light having similar wavelength ranges can be reduced, thereby improving color purity of red, green and blue lights. Therefore, color reproducibility and image display quality of the display device can be improved.

Having described exemplary embodiments of the present invention, it should also be noted that those skilled in the art will readily appreciate that various modifications can be made without departing from the spirit and scope of the present invention as defined by the metes and bounds of the claims. kind of modification.

Claims (3)

1. a backlight assembly, comprising:

Fluorescent light, described fluorescent light comprises: lamp body, there is discharge space, in discharge space, produce ultraviolet light; Fluorescence coating, is formed on the inside surface of lamp body so that ultraviolet light is converted to visible ray, at wavelength, is that 516nm place and wavelength are that the intensity of the visible ray at 579nm place is 1: 0.25 to 1: 0.27; Sparking electrode, on the end of lamp body so that voltage is applied to discharge space;

Optical component, contiguous fluorescent light is to improve the optical characteristics of visible ray;

Hold container, hold fluorescent light and optical component,

Wherein, at wavelength, be that 545nm place and wavelength are that the intensity of the visible ray at 516nm place is 1.32: 1 to 1.71: 1.

2. a display device, comprising:

Fluorescent light, described fluorescent light comprises: lamp body, there is discharge space, in discharge space, produce ultraviolet light; Fluorescence coating, is formed on the inside surface of lamp body so that ultraviolet light is converted to visible ray, at wavelength, is that 545nm place and wavelength are that the intensity of the visible ray at 516nm place is 1.32: 1 to 1.71: 1; Sparking electrode, on the end of lamp body so that voltage is applied to discharge space;

Optical component, contiguous fluorescent light is to improve the optical characteristics of visible ray;

Hold container, hold fluorescent light and optical component;

Display panel, is arranged on optical component, to utilize the light through optical component to show image.

3. display device as claimed in claim 2 wherein, is that 545nm place, wavelength are that 516nm place and wavelength are that the intensity of the visible ray at 579nm place is 1.32: 1: 0.25 to 1.53: 1: 0.26 at wavelength.