CN101308283A - Color filter substrate and liquid crystal display using the same - Google Patents

Abstract

A color filter substrate and a liquid crystal display using the same are provided, wherein the color filter substrate includes a plurality of green photoresists. G (λ) is a transmission spectrum of the green resist, CMF _ x (λ) is a color matching function formulated by the International Commission on illumination, wherein the maximum value of G (λ) × CMF _ x (λ) between 450 nm and 510 nm is M1, the maximum value of G (λ) × CMF _ x (λ) between 550 nm and 590 nm is M2, and the ratio of M1 to M2 is less than or equal to 0.04, and the full width at half maximum of the peak of G (λ) is D, and D is less than or equal to 90 nm. The invention can improve the color saturation of the liquid crystal display.

Description

Color filter substrate and liquid crystal display using the color filter substrate

technical field

The invention relates to a display device; in particular, it relates to a liquid crystal display and its color filter substrate.

Background technique

With the advancement of flat panel display technology and the advantages of light weight, small size and power saving of flat panel displays, flat panel displays have become more and more popular. Common flat-panel displays include Liquid Crystal Display (LCD), Plasma Display Panel (PDP), Organic Light Emitting Diode Display (OLED Display), and Electrophoretic Display (EPD), etc. Among them, liquid crystal displays have the highest penetration rate.

The liquid crystal display includes a liquid crystal display panel (LCD panel) and a backlight module (BacklightModule), wherein the backlight module can provide flat light to the liquid crystal display panel. In addition, the color filter substrate of the liquid crystal display panel is an important component for colorizing the plane light.

Due to the gradual development of LCD monitors towards high color saturation (Color Saturation), LCD monitors that support sRGB color space (Color Space) can no longer meet the needs of professionals for color, so LCD monitors that support Adobe RGB color space have been developed.

However, in the prior art, the light sources of the backlight modules of LCDs supporting the Adobe RGB color space are all light emitting diodes (Light Emitting Diode, LED). Color Cold Cathode Fluorescent Lamp, Hi-Color CCFL), cannot fully cover the Adobe RGB color space.

Figure 1 illustrates the color space of an existing liquid crystal display using cold cathode fluorescent tubes in the chromaticity diagram (CIE 1931 Chromaticity Diagram) formulated by the International Commission on Illumination (Commission Internationale de L'Eclairage, CIE) in 1931 and the Adobe RGB color space. Please refer to FIG. 1 , the space inside the triangle 50 is the Adobe RGB color space, and the space inside the triangle 60 is the color space of an existing liquid crystal display using cold cathode fluorescent tubes. It can be seen from Figure 1 that the color space of an LCD using an existing CCFL cannot completely cover the Adobe RGB color space, especially in the areas R1 (i.e. green area) and area R2 (i.e. blue area) .

Contents of the invention

The object of the present invention is to provide a color filter substrate to improve the color saturation of a liquid crystal display.

Another object of the present invention is to provide a liquid crystal display which has the advantage of high color saturation.

To achieve the above purpose, the present invention provides a color filter substrate, which has a plurality of green photoresists. G(λ) is the transmission spectrum of green photoresist, CMF_x(λ) is the color matching function (Color Matching Function) formulated by the International Commission on Illumination, where G(λ)×CMF_x(λ) is at a wavelength of 450 nanometers (nanometer) and The maximum value between 510 nanometers is M1, the maximum value of G(λ)×CMF_x(λ) between wavelengths 550 nm and 590 nm is M2, and the ratio of M1 to M2 is less than or equal to 0.04, and G(λ) The full width at half maximum (FWHM) of the wave peak is D, and D is less than or equal to 90 nanometers.

In an embodiment of the present invention, the ratio of M1 to M2 is less than or equal to 0.03.

In an embodiment of the present invention, the material of each green photoresist includes Color Index Green 36 and Color Index Yellow 150 .

In an embodiment of the present invention, the material of each green photoresist includes color index green 36 , color index yellow 150 and color index yellow 139 .

In an embodiment of the present invention, the color filter substrate further has a plurality of blue photoresists and a plurality of red photoresists.

To achieve the above purpose, the present invention also proposes a liquid crystal display, which includes a liquid crystal display panel and a backlight module. The liquid crystal display panel has a color filter substrate, and the color filter substrate has a plurality of green light resists. G(λ) is the transmission spectrum of the green photoresist, CMF_x(λ) is the color matching function formulated by the International Commission on Illumination, where the maximum value of G(λ)×CMF_x(λ) between the wavelengths of 450 nm and 510 nm is M1, the maximum value of G(λ)×CMF_x(λ) between wavelengths of 550 nm and 590 nm is M2, and the ratio of M1 to M2 is less than or equal to 0.04, and the half-maximum width of the peak of G(λ) is D , and D is less than or equal to 90 nm. In addition, the backlight module is arranged next to the liquid crystal display panel to provide planar light to the liquid crystal display panel. The emission spectrum of the planar light emitted by the backlight module has a relatively maximum value between the wavelength of 505 nm and 525 nm, and the emission of the planar light The spectrum has another relative maximum between wavelengths 540 nm and 550 nm.

In an embodiment of the present invention, the ratio of M1 to M2 is less than or equal to 0.03.

In an embodiment of the present invention, the material of each green photoresist includes color index green 36 and color index yellow 150 .

In an embodiment of the present invention, the material of each green photoresist includes color index green 36 , color index yellow 150 and color index yellow 139 .

In an embodiment of the present invention, the above-mentioned color filter substrate further has a plurality of blue photoresists and a plurality of red photoresists.

In an embodiment of the present invention, the green color displayed by the above-mentioned liquid crystal display panel corresponds to the values of the x-coordinate and the y-coordinate of the chromaticity diagram formulated by the International Commission on Illumination in 1931. The values of the coordinates are Gx and Gy, wherein Gy≥0.71 , and 0.1×Gy+0.15≥Gx≥(-1.13)×Gy+1.

In an embodiment of the present invention, the above-mentioned backlight module includes at least one CCFL tube.

In the color filter substrate of the present invention, since the FWHM D is limited to be less than or equal to 90 nanometers, and the ratio of M1 to M2 is less than or equal to 0.04, the color saturation of the liquid crystal display can be improved. Therefore, the liquid crystal display using the color filter substrate has higher color saturation.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments will be described in detail below together with the accompanying drawings.

Description of drawings

Figure 1 shows the color space of an existing liquid crystal display using cold cathode fluorescent tubes in the chromaticity diagram formulated by the International Commission on Illumination in 1931 and the Adobe RGB color space.

FIG. 2 is a schematic diagram of an embodiment of the liquid crystal display of the present invention.

FIG. 3 is a schematic diagram of a color filter substrate of the liquid crystal display panel in FIG. 2 .

FIG. 4 shows the color matching function and the transmission spectra of three kinds of green photoresists of the present invention and the transmission spectra of two existing green spectrums.

FIG. 5 shows the values of G(λ)×CMF_x(λ) for various green photoresists in FIG. 4 .

Figure 6 shows the partial color space of the chromaticity diagram formulated by the International Commission on Illumination in 1931 and a part of the Adobe RGB color space of the liquid crystal display using various green photoresists in Figure 4.

Wherein, the reference signs are explained as follows:

50, 60: triangle

100: LCD display

200: backlight module

202: Flat light

210: light source

300: LCD display panel

310: Color filter substrate

312: Substrate

314b: blue photoresist

314g: Green photoresist

314r: red photoresist

320: active element array substrate

330: liquid crystal layer

Detailed ways

FIG. 2 is a schematic diagram of an embodiment of the liquid crystal display of the present invention; FIG. 3 is a schematic diagram of a color filter substrate of the liquid crystal display panel in FIG. 2 . Referring to FIG. 2 and FIG. 3 , the LCD 100 includes a backlight module 200 and a LCD panel 300 , wherein the backlight module 200 is disposed next to the LCD panel 300 to provide planar light 202 to the LCD panel 300 . The backlight module 200 shown in FIG. 2 is a side-illuminated backlight module, and the light source 210 thereof can be a CCFL tube, but not limited thereto. In addition, the backlight module 200 can also be a direct type backlight module. In addition, the liquid crystal display panel 300 may include a color filter substrate 310 , an active element array substrate 320 (such as a TFT array substrate), and a liquid crystal layer 330 disposed between the color filter substrate 310 and the active element array substrate 320 .

The color filter substrate 310 includes a substrate 312 and a plurality of color photoresists (such as a green photoresist 314g , a red photoresist 314r and a blue photoresist 314b ) disposed on the substrate 312 . In addition, the transmission spectrum of the green photoresist 314g is G(λ), and the color matching function formulated by the International Commission on Illumination is CMF_x(λ), where λ is the wavelength. The maximum value of G(λ)×CMF_x(λ) between wavelength 450nm and 510nm is M1, the maximum value of G(λ)×CMF_x(λ) between wavelength 550nm and 590nm is M2, and The full width at half maximum of the peak of G(λ) is D. In order to enhance the color saturation of the liquid crystal display 100 , the green photoresist 314 g of this embodiment needs to meet the following conditions: the ratio of M1 to M2 is less than or equal to 0.04, and D is less than or equal to 90 nanometers. In a preferred embodiment, the ratio of M1 to M2 is less than or equal to 0.03.

In the liquid crystal display 100 , the color filter substrate 310 can also be integrated into the active element array substrate 320 (ie, an array substrate with a color filter film (Color Filter On Array Substrate, COASubstrate)). The emission spectrum of the planar light 202 provided by the backlight module 200 has a relative maximum value between the wavelengths of 505 nm and 525 nm, and the emission spectrum of the planar light 202 has another relative maximum value between the wavelengths of 540 nm and 550 nm .

The green displayed on the liquid crystal display panel 300 corresponds to the values of the x-coordinate and the y-coordinate of the chromaticity diagram formulated by the International Commission on Illumination in 1931. The values of the coordinates are Gx and Gy respectively, wherein Gy is, for example, greater than or equal to 0.71, and 0.1×Gy +0.15≥Gx≥(-1.13)×Gy+1. In addition, the material of each green photoresist 314g may include color index green 36 and color index yellow 150 , or include color index green 36 , color index yellow 150 and color index yellow 139 , but not limited thereto.

FIG. 4 shows the color matching function and the transmission spectra of three kinds of green photoresists of the present invention and the transmission spectra of two existing green spectrums. In FIG. 4 , G(λ)-P1 and G(λ)-P2 are the transmission spectra of two existing green photoresists, and their FWHMs are 98.4 nm and 88.7 nm, respectively. G(λ)-E1 is the transmission spectrum of the green photoresist 314g according to the first embodiment of the present invention, its FWHM is 86.3nm, and the material of the green photoresist 314g includes color index green 36 and color index yellow 150 . G(λ)-E2 is the transmission spectrum of the green photoresist 314g according to the second embodiment of the present invention, its FWHM is 67.7 nanometers, and the material of the green photoresist 314g includes color index green 36, color index yellow 150 and Color index yellow 139. G(λ)-E3 is the transmission spectrum of the green photoresist 314g according to the third embodiment of the present invention, and its FWHM is 64.4 nm. The material of the green photoresist 314g includes color index green 36 , color index yellow 150 and color index yellow 139 .

Compared with the prior art, the green photoresist 314g in each embodiment of the present invention has a smaller FWHM of the transmission spectrum (all less than 90 nm), so the color saturation of the liquid crystal display 100 can be improved. In addition, compared with the prior art, since the transmission spectrum of the green photoresist 314g in each embodiment of the present invention is shifted to the right in FIG. 4 , the liquid crystal display 100 can support the Adobe RGB color space.

FIG. 5 shows the values of G(λ)×CMF_x(λ) for various green photoresists in FIG. 4 . In Fig. 5, G(λ)-E1×CMF_x(λ), G(λ)-E2×CMF_x(λ), G(λ)-E3×CMF_x(λ), G(λ)-P1×CMF_x( λ) and G(λ)-P2×CMF_x(λ) at wavelengths between 550nm and 590nm (M2) are both about 1, while G(λ)-P1×CMF_x(λ) and G( λ)-P2×CMF_x(λ) has a maximum value (namely M1) greater than 0.04 between wavelengths of 450 nm and 510 nm, while G(λ)-E1×CMF_x(λ), G(λ)-E2×CMF_x( λ), G(λ)−E3×CMF_x(λ) have a maximum value (ie, M1) of wavelengths between 450 nm and 510 nm that is less than 0.03. Therefore, the green photoresist 314g of each embodiment of the present invention can meet M1/M2≤0.04, which helps to reduce the transmittance of short-wavelength light, thereby improving the color saturation of the liquid crystal display 100 and supporting the Adobe RGB color space .

Figure 6 shows the partial color space of the chromaticity diagram formulated by the International Commission on Illumination in 1931 and a part of the Adobe RGB color space of the liquid crystal display using various green photoresists in Figure 4. In FIG. 6 , G-E1 is the color space of the liquid crystal display 100 using the green photoresist 314g of the first embodiment of the present invention, and its green coordinates (Gx, Gy) are (0.208, 0.708). G-E2 is the color space of the liquid crystal display 100 using the green photoresist 314g according to the second embodiment of the present invention, and its green coordinates are (0.208, 0.713). G-E3 is the color space of the liquid crystal display 100 using the green photoresist 314g according to the third embodiment of the present invention, and its green coordinates are (0.209, 0.711). G-P1 is a color space of a liquid crystal display using an existing green photoresist, and its green coordinates are (0.209, 0.685). G-P2 is a color space of a liquid crystal display using another existing green photoresist, and its green coordinates are (0.192, 0.712). Also, the green coordinates of the Adobe RGB color space are (0.210, 0.710).

It can be seen from FIG. 6 that, compared with the prior art, the color space of the liquid crystal display 100 using the green photoresist 114g of each embodiment of the present invention can at least roughly cover the Adobe RGB color space. Therefore, the liquid crystal display 100 can indeed support the Adobe RGB color space under the condition that the CCFL is used as the light source 210 .

To sum up, in the color filter substrate of the present invention, since the FWHM D is limited to be less than or equal to 90 nanometers, and the ratio of M1 to M2 is less than or equal to 0.04, the color saturation of the liquid crystal display can be improved. Therefore, the liquid crystal display using the color filter substrate has higher color saturation. In addition, the liquid crystal display using the color filter substrate can support the Adobe RGB color space when the cold cathode fluorescent tube is used as the light source.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those skilled in the art may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection of the present invention The scope should be determined as defined by the appended claims.

Claims (12)

1. A color filter substrate, comprising: A plurality of green photoresists, and G(λ) is the transmission spectrum of these green photoresists, CMF_x(λ) is a color matching function, wherein G(λ)×CMF_x(λ) is at wavelengths between 450 nm and 510 nm The maximum value is M1, the maximum value of G(λ)×CMF_x(λ) is M2 between the wavelength of 550 nm and 590 nm, and the ratio of M1 to M2 is less than or equal to 0.04, and the half-height of the peak of G(λ) The width is D, and D is less than or equal to 90 nanometers. 2. The color filter substrate as claimed in claim 1, wherein the ratio of M1 to M2 is less than or equal to 0.03. 3 . The color filter substrate as claimed in claim 1 , wherein the material of each green photoresist comprises color index green 36 and color index yellow 150 . 4 . The color filter substrate as claimed in claim 1 , wherein the material of each green photoresist comprises color index green 36 , color index yellow 150 and color index yellow 139 . 5. The color filter substrate as claimed in claim 1, further comprising a plurality of blue photoresists and a plurality of red photoresists. 6. A liquid crystal display, comprising: A liquid crystal display panel, which has a color filter substrate, the color filter substrate has a plurality of green photoresists, G(λ) is the transmission spectrum of the plurality of green photoresists, CMF_x(λ) is a color matching function, wherein G The maximum value of (λ)×CMF_x(λ) between the wavelengths of 450 nm and 510 nm is M1, the maximum value of G(λ)×CMF_x(λ) between the wavelengths of 550 nm and 590 nm is M2, and M1 and The ratio of M2 is less than or equal to 0.04, and the peak of G(λ) has a full width at half maximum of D, and D is less than or equal to 90 nanometers; and The backlight module is arranged next to the liquid crystal display panel to provide planar light to the liquid crystal display panel, wherein the emission spectrum of the planar light has a relatively maximum value between the wavelengths of 505 nm and 525 nm, and the emission spectrum of the planar light There is another relative maximum between wavelengths 540 nm and 550 nm. 7. The liquid crystal display as claimed in claim 6, wherein the ratio of M1 to M2 is less than or equal to 0.03. 8 . The liquid crystal display as claimed in claim 6 , wherein the material of each green photoresist comprises color index green 36 and color index yellow 150 . 9 . The liquid crystal display as claimed in claim 6 , wherein the material of each green photoresist comprises color index green 36 , color index yellow 150 and color index yellow 139 . 10. The liquid crystal display as claimed in claim 6, wherein the color filter substrate further has a plurality of blue photoresists and a plurality of red photoresists. 11. The liquid crystal display as claimed in claim 6, wherein the green color displayed by the liquid crystal display panel corresponds to the values of the x coordinate and the y coordinate in the chromaticity diagram are Gx and Gy respectively, wherein Gy≥0.71, and 0.1×Gy +0.15≥Gx≥(-1.13)×Gy+1. 12. The liquid crystal display as claimed in claim 6, wherein the backlight module has at least one CCFL.

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