KR20200047942A - Display device - Google Patents

Abstract

A display device according to an exemplary embodiment of the present invention includes a display panel having a plurality of pixels; A light source unit that emits light; A light transmitting unit that directly transmits light to the plurality of pixels; And a light diffusion unit disposed between the light source unit and the light transmission unit to transmit light emitted from the light source unit to the light transmission unit.
According to an embodiment of the present invention, the color filter from the display panel is transmitted by directly transmitting the red, green, and blue light from the display panel to pixels of the display panel by using a light-transmitting unit applied to the optical fiber. By removing, the light efficiency of the display device can be improved, and heat from the light source unit is prevented from being transferred to the display panel, thereby improving the performance and service life of the display panel.

Description

Display device {DISPLAY DEVICE}

The present invention relates to a display device, and more particularly, to a display device without a color filter.

In general, a liquid crystal display (LCD) is composed of a liquid crystal panel having a liquid crystal pixel that functions as a light valve by controlling light transmittance and a backlight unit that supplies light to the liquid crystal panel.

As such, the backlight unit includes a CCFL (Cold Cathode Fluorescence Lamp), or an EEFL (External Electrode Fluorescence Lamp), or a white light LED, or a red, green, blue tricolor R, G, B LED, and other light source assembly parts. , It consists of light sheets that reflect light from the light source from a reflector located below the light source or mix it through a light sheet and deliver it to multiple liquid crystal pixels.

Here, referring to FIG. 1, the liquid crystal panel includes a rear polarizer 1, a front polarizer 2, a plurality of liquid crystal pixels 3 and a front polarizer 1 installed between the rear polarizer 1 and the front polarizer 2. ) And is provided between the liquid crystal pixels 3 and consists of a color filter 4 that transmits R, G, and B light.

Therefore, the white light coming from the backlight unit 5 passes through the color filter 4 disposed in front of the liquid crystal pixel 3 and transmits a specific color corresponding to the color filter 4 to the liquid crystal, thereby realizing a color image. do.

That is, in the conventional LCD, the color filter 4 is necessarily required as the backlight unit 5 emits white light.

However, in the conventional LCD, the white light emitted from the backlight unit 5 passes through the liquid crystal pixel 3 and the color filter 4 and is mostly lost, so that the light efficiency of the LCD is deteriorated.

In addition, in order to prevent the loss of light emitted from the backlight unit, the backlight unit is disposed in a position close to the liquid crystal panel, there is a problem that the heat emitted from the backlight unit affects the liquid crystal panel.

Korean Registered Patent Publication No. 10-0249187

The present invention has been devised to solve the above problems, and an object of the present invention is to provide a display device capable of improving light efficiency by removing color filters from the display panel by transmitting light directly to pixels of the display panel. Is to do.

The problems of the present invention are not limited to the problems mentioned above, and other problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

A display device according to an exemplary embodiment of the present invention for solving the above problems includes a display panel having a plurality of pixels; A light source unit spaced apart from the display panel and emitting light; A light transmitting unit that directly transmits light to the plurality of pixels; And a light diffusion unit disposed between the light source unit and the light transmission unit to transmit light emitted from the light source unit to the light transmission unit.

The light source unit may include a first light source that emits red light; A second light source that emits green light; And a third light source that emits blue light. The first light source, the second light source, and the third light source may include LEDs.

The light transmission unit, one side is directly connected to the light diffusion unit, the other side of the light transmission unit is directly connected to the plurality of pixels, respectively corresponding to the first light source, the second light source and the third light source It can be applied as a plurality of optical fiber bundles (BUNDLE).

The plurality of bundles of optical fibers may each include a plurality of optical fiber cables (CABLE) directly connected to the plurality of pixels.

The optical fiber cables transmitting each color may be sequentially arranged along a predetermined direction.

The light diffusion unit is spaced at a predetermined distance from the light source unit, is applied to at least one of the light guide plate, the lens, and the diffusion plate, and directs light to the light transmission unit through a direct method or a side dimming method according to the direction of light incident from the light source unit. Can deliver.

The light diffusion unit may include a first light diffusion member corresponding to the first light source; A second light diffusion member corresponding to the second light source; And a third light diffusion member corresponding to the third light source. It may include.

Each of the plurality of optical fiber cables may be formed to have a smaller cross-sectional area than the size of the planar area of each pixel.

Each optical fiber cable may have a size of the largest outer diameter on a cross-section based on the plane of the pixel that is less than or equal to the size of the smallest width of the pixel, and greater than or equal to a size of 1/10 of the smallest width of the pixel.

According to an embodiment of the present invention, the color filter is removed from the display panel by directly transmitting the red, green, and blue light from the display panel to pixels of the display panel by using a light-transmitting unit applied to the optical fiber. By removing, the light efficiency of the display device can be improved, and heat from the light source unit is prevented from being transferred to the display panel, thereby improving the performance and service life of the display panel.

1 is a view schematically showing a conventional display device.
2 is a view schematically showing a display device according to an embodiment of the present invention.
3 is a cross-sectional view taken along line A'-A 'of FIG. 2.
4 is a diagram schematically showing a cross-section of a light transmission unit of a display device according to an embodiment of the present invention.
5 is a view schematically showing a state in which a light diffusion unit and a light source unit of a display device according to an embodiment of the present invention are spaced apart from a display panel.

Hereinafter, various embodiments will be described in detail with reference to the accompanying drawings. The embodiments described herein can be variously modified. Specific embodiments are depicted in the drawings and may be described in detail in the detailed description. However, the specific embodiments disclosed in the accompanying drawings are only for easy understanding of various embodiments. Therefore, the technical spirit is not limited by the specific embodiments disclosed in the accompanying drawings, and should be understood to include all equivalents or substitutes included in the spirit and technical scope of the invention.

Terms including ordinal numbers such as first and second may be used to describe various components, but these components are not limited by the above-described terms. The above-mentioned terms are used only for the purpose of distinguishing one component from other components.

In this specification, the terms "comprises" or "have" are intended to indicate the presence of features, numbers, steps, actions, components, parts or combinations thereof described in the specification, one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance. When an element is said to be "connected" or "connected" to another component, it is understood that other components may be directly connected to or connected to the other component, but there may be other components in between. It should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that no other component exists in the middle.

On the other hand, "module" or "unit" for the components used in the specification performs at least one function or operation. In addition, the "module" or "unit" may perform a function or operation by hardware, software, or a combination of hardware and software. In addition, a plurality of "modules" or a plurality of "parts" excluding "modules" or "parts" that are to be performed on specific hardware or performed on at least one processor may be integrated into at least one module. Singular expressions include plural expressions unless the context clearly indicates otherwise.

In addition, in describing the present invention, when it is determined that detailed descriptions of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, detailed descriptions thereof are abbreviated or omitted.

2 is a view schematically showing a display device according to an embodiment of the present invention, FIG. 3 is a cross-sectional view taken along line A'-A 'of FIG. 2, and FIG. 4 is a display device according to an embodiment of the present invention It is a diagram schematically showing a cross-section of the light-transmitting portion, and FIG. 5 is a diagram schematically showing a state in which the light diffusing portion and the light source portion of the display device according to the exemplary embodiment are spaced apart from the display panel.

Referring to FIG. 2, the display device 100 (hereinafter referred to as “display device 100”) according to an embodiment of the present invention directly displays light by transmitting light to the pixel 113 of the display panel 110. As a display device 100 capable of improving light efficiency by removing a color filter from the panel 110, the display panel 110 is included.

The display panel 110 includes a first polarizing plate 111 disposed on a side to which light flows, a second polarizing plate 112 disposed opposite to the first polarizing plate 111 along a direction in which light is emitted, and a first polarizing plate 111 ) And a plurality of pixels 113 disposed between the second polarizing plate 112.

Accordingly, the display panel 110 may implement color by allowing light directly transmitted to the plurality of pixels 113 to pass through the plurality of pixels 113 and the second polarizing plate 112 and enter the liquid crystal.

In addition, the display device 100 includes a light source unit 120.

The light source unit 120 is configured to emit light spaced apart from the display panel 110, but is configured to emit red, green, and blue light.

More specifically, the light source unit 120 may include a first light source 121 emitting red light, a second light source 122 emitting green light, and a third light source 123 emitting blue light. .

For example, a plurality of light sources can be applied to the LED module having high luminance with low power. However, the plurality of light sources is not necessarily limited thereto, and may be applied as other light emitting means capable of implementing the same function.

In addition, the display device 100 includes a light transmission unit 130.

One side of the light transmitting unit 130 is directly connected to the light diffusion unit 140, which will be described later, and the other side is connected to the plurality of pixels 113 to directly transmit light to the plurality of pixels 113.

More specifically, the light transmission unit 130 corresponds to a first light source 121 emitting red light, a second light source 122 emitting green light, and a third light source 123 emitting blue light, respectively. , By connecting the light diffusion unit 140 and the pixels 113 of the display panel 110 to each other, the red, green, and blue light transmitted to the light diffusion unit 140 through the light source unit 120 is displayed on the display panel 110 ) May be formed of a plurality of bundles of optical fibers (BUNDLE) that directly transfer to the plurality of pixels 113 provided in).

In addition, the plurality of bundles of optical fibers may be composed of a plurality of optical fiber cables (CABLEs) directly connected to the plurality of pixels 113, respectively.

Each fiber (Optical fiber, Fiber optics) cable is a thin, flexible fiber made by drawing a thin and long transparent dielectric material such as quartz glass or plastic. The light incident through the light passes through the center and does not leak even when slightly bent. It can propagate long distances without loss. For example, each optical fiber cable may be bonded to the pixel 113 and the light diffusion unit 140 using an adhesive member or melted through heat to be fused to the pixel 113 and the light diffusion unit 140. However, the method in which the optical fiber cable is connected to the light diffusion unit 140 and the pixel 113 is not limited thereto, and may be applied in various ways such as a connector contact method.

4, each optical fiber cable is composed of a core (131) (CORE) through which light passes and a cladding (132) (CLADDING) that wraps around the core 131 to reflect light passing through the core (131). Can be.

That is, the optical fiber cable may transmit light to a long distance by repeatedly reflecting light passing through the core 131 by the cladding 132 when the light passes through the core 131.

Accordingly, the light source unit 120 and the light transmission unit 130 connected through the plurality of optical fiber cables as described above are separated from the display panel 110 as shown in (a) and (b) of FIG. 5 and the display panel. It is separated from the (110) and a long distance, through which it is possible to minimize the occurrence of the influence of heat on the display panel (110).

In addition, referring to FIG. 2, optical fiber cables transmitting each color may be sequentially arranged along a preset direction.

For example, a plurality of optical fiber cables may be sequentially arranged in the order of red, green, and blue along the horizontal direction based on FIG. 2 to transmit light of each color to the plurality of pixels 113.

Meanwhile, each optical fiber cable directly connected to each pixel 113 may be formed in a predetermined size.

Referring to FIG. 3, the plurality of optical fiber cables may be formed to have a smaller cross-sectional area than that of each pixel 113 to which the size of the cross-sectional area is connected.

More specifically, each optical fiber cable has a size (B) of the largest outer diameter in a cross-section with respect to the plane of the pixel 113 smaller than or equal to the size (A) of the smallest width of the pixel 113, and the pixel 113 It may be formed equal to or larger than the size of 1/10 of the smallest width of. ((0.1 × A) ≤ B ≤ A)

In addition, the display device 100 includes a light diffusion unit 140.

Referring to FIG. 2, the light diffusion unit 140 is disposed between the light source unit 120 and the light transmission unit 130 to transmit light emitted from the light source unit 120 to the light transmission unit 130.

More specifically, the light diffusion unit 140 is spaced a predetermined distance from the light source unit 120, and may be applied to at least one of a light guide plate, a lens, and a diffusion plate. Then, the light diffusion unit 140 may transmit light to the light transmission unit 130 through a direct method or a side dimming method according to the direction of the light incident from the light source unit 120, that is, the position of the light source unit 120. Through this, the viewing angle and luminance can be appropriately adjusted.

For example, the light diffusion unit 140 may include a first light diffusion member 141 corresponding to the first light source 121 emitting red light and a second light diffusion corresponding to the second light source 122 emitting green light. A member 142 and a third light diffusion member 143 corresponding to the third light source 123 emitting blue light may be included. Further, an optical pattern may be further formed on each light diffusion unit 140 material.

As described above, according to an embodiment of the present invention, the red, green, and blue light of the light source unit 120 disposed at a long distance from the display panel 110 using the optical transmission unit 130 applied as an optical fiber is displayed on the display panel 110. By directly transmitting to the pixel 113 of the color filter can be removed from the display panel 110 to improve the light efficiency of the display device 100, the heat of the light source unit 120 is transferred to the display panel 110 It is possible to improve the performance and service life of the display panel 110 by preventing it.

In the above, preferred embodiments of the present invention have been illustrated and described, but the present invention is not limited to the specific embodiments described above, and it is usually in the technical field to which the present invention belongs without departing from the gist of the present invention claimed in the claims. It is of course possible to perform various modifications by a person having knowledge of, and these modifications should not be individually understood from the technical idea or prospect of the present invention.

100. Display device
110. Display panel
111. 1st polarizing plate
112. Second polarizing plate
113.Pixel
120. Light source
121. First light source
122. Second light source
123. Third light source
130. Optical transmission
131.Core
132. Cladding
140. Light Diffusion Department
141.First light diffusion member
142. Second light diffusion member
143. Third light diffusion member

Claims (9)

A display panel having a plurality of pixels;
A light source unit spaced apart from the display panel and emitting light;
A light transmitting unit that directly transmits light to the plurality of pixels; And
A light diffusion unit disposed between the light source unit and the light transmission unit to transmit light emitted from the light source unit to the light transmission unit;
Display device comprising a. According to claim 1,
The light source unit,
A first light source emitting red light;
A second light source that emits green light; And
A third light source that emits blue light;
Including,
The first light source, the second light source and the third light source are LED display devices. According to claim 2,
The light transmitting unit,
One side is directly connected to the light diffusion unit, the other side is directly connected to the plurality of pixels, and the plurality of optical fiber bundles (BUNDLE) respectively corresponding to the first light source, the second light source, and the third light source. Applied display device. According to claim 3,
Each of the plurality of optical fiber bundles includes a plurality of optical fiber cables (CABLEs) directly connected to the plurality of pixels. The method of claim 4,
The optical fiber cable that carries each color is a display device that is sequentially arranged along a preset direction. According to claim 1,
The light diffusion unit is spaced at a predetermined distance from the light source unit, is applied to at least one of the light guide plate, the lens, and the diffusion plate, and directs light to the light transmission unit through a direct method or a side dimming method according to the direction of light incident from the light source unit. Display device to convey. According to claim 2,
The light diffusion unit,
A first light diffusion member corresponding to the first light source;
A second light diffusion member corresponding to the second light source; And
A third light diffusion member corresponding to the third light source;
Display device comprising a. The method of claim 4,
Each of the plurality of optical fiber cables has a cross-sectional area, which is formed smaller than the size of a planar area of each pixel. The method of claim 8,
Each optical fiber cable has a display device having a largest outer diameter on a cross-section with respect to the plane of the pixel that is less than or equal to the size of the smallest width of the pixel, and greater than or equal to 1/10 of the smallest width of the pixel.

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