KR20110058195A - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

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Publication number
KR20110058195A
KR20110058195A KR1020090114893A KR20090114893A KR20110058195A KR 20110058195 A KR20110058195 A KR 20110058195A KR 1020090114893 A KR1020090114893 A KR 1020090114893A KR 20090114893 A KR20090114893 A KR 20090114893A KR 20110058195 A KR20110058195 A KR 20110058195A
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KR
South Korea
Prior art keywords
light
liquid crystal
crystal display
light emitting
color filter
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KR1020090114893A
Other languages
Korean (ko)
Inventor
이호천
Original Assignee
엘지디스플레이 주식회사
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Priority to KR1020090114893A priority Critical patent/KR20110058195A/en
Publication of KR20110058195A publication Critical patent/KR20110058195A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The present invention relates to a liquid crystal display device capable of improving display characteristics such as color reproducibility and luminance, the liquid crystal display device comprising: a liquid crystal display panel configured to include color filters of red, green, and blue; And a backlight unit generating white light using a light emitting diode and irradiating the generated white light to the liquid crystal display panel, wherein the red color filter has a wavelength position corresponding to half of a peak intensity of 580 nm or more. It is characterized by.

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY DEVICE}

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of improving display characteristics such as color reproducibility and luminance.

In general, a liquid crystal display device includes a liquid crystal display panel and a backlight unit disposed on a rear surface of the liquid crystal display panel to provide white light to the liquid crystal display panel.

The liquid crystal display panel uses the dielectric anisotropy of the liquid crystal in which the torsion angle changes according to the data voltage, thereby changing the amount of white light provided from the backlight unit for each of the red, green, and blue subpixels constituting the unit pixel. A desired color image is displayed by combining red, green, and blue light emitted through the red, green, and blue color filters formed to correspond to.

As a light source of the backlight unit, a cold cathode fluorescent lamp, an external electrode fluorescent lamp, and a light emitting diode are widely used.

Since the fluorescent lamps are line light sources, the backlight unit employing the fluorescent lamps disperses light generated from the fluorescent lamps by using optical members such as a light guide plate (or a diffuser plate), a diffusion sheet, and a prism sheet to a liquid crystal display panel. to provide.

However, even when the backlight unit employing the fluorescent lamp is used to provide light to the liquid crystal display panel, the optical unit, the liquid crystal, and the color filter are substantially lost while passing the light, thereby reducing the color reproducibility and luminance of the liquid crystal display. There is a problem.

Since light emitting diodes have characteristics such as small size, low power consumption and high reliability, they are widely used as light sources of backlight units. When the light emitting diodes are configured in an array form, the light emitting diodes can be used as surface light sources.

However, even when light is provided to the liquid crystal display panel using a back light unit employing a light emitting diode, a substantial portion is lost while passing through the optical members, the liquid crystal, and the color filter, thereby reducing the color reproducibility and luminance of the liquid crystal display. There is a problem.

Accordingly, there is a demand for a method of improving color reproducibility, luminance, and the like of the liquid crystal display.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and a technical object of the present invention is to provide a liquid crystal display device capable of improving display characteristics such as color reproducibility and luminance.

The present inventors found that display characteristics such as color reproducibility and luminance of a liquid crystal display device are mainly determined by a light emission spectrum of a backlight unit and a transmission spectrum of a color filter formed in the liquid crystal display panel, that is, emitted from the backlight unit. It has been recognized that the color filter is optimized when it has an appropriate transmission band and peak wavelength corresponding to the transmission spectrum of white light.

And it was confirmed that the characteristics of the color filter of the liquid crystal display are optimized for the light emission characteristics of the backlight unit employing the fluorescent lamp.

Therefore, the inventors of the present invention have not optimized the light emission characteristics of the fluorescent lamps and the transmission characteristics of the color filters, so that red (R '), green (G) and blue in the CIE coordinate system, as shown in Figs. It can be seen that the triangle R'GB formed by the color of (B) is not formed to match the triangle RGB corresponding to the NTSC standard. This is to recognize the problem that the color reproducibility (FIG. 1) and the luminance (FIG. 2) of the liquid crystal display are degraded by redishness generated at the left and right viewing angles due to the optical loss of the hatched regions of FIGS. 1 and 2. It became.

Thus, the present inventors have recognized that the above-described specific problems, and when optimizing the light emission characteristics of the light emitting diode and the transmission characteristics of the color filter, it is confirmed that the display characteristics such as color reproducibility and luminance of the liquid crystal display device can be improved. To complete.

According to an aspect of the present invention, a liquid crystal display device includes: a liquid crystal display panel configured to include color filters of red, green, and blue colors; And a backlight unit generating white light using a light emitting diode and irradiating the generated white light to the liquid crystal display panel, wherein the red color filter has a wavelength position corresponding to half of a peak intensity of 580 nm or more. It is characterized by.

The blue color filter is characterized in that the wavelength position corresponding to half of the peak intensity is 500nm or less.

The green color filter is characterized in that the wavelength position corresponding to half of the peak intensity is 480nm or more and 570nm or less. In this case, the green color filter is characterized in that the width of the portion corresponding to half of the peak intensity is 90nm.

The backlight unit may include a light source unit generating the white light by using a light emitting diode array having a plurality of light emitting diodes; And a plurality of optical members which improve luminance characteristics of the white light emitted from the light source unit and irradiate the back surface of the liquid crystal display panel.

The color coordinates (x, y) of the white light emitted from the light emitting diode are (0.294, 0.268), and the white light emitted from the light emitting diode has a blue peak wavelength of 450 nm, a green peak wavelength of 530 nm, and a red peak of 630 nm. It is characterized by including the wavelength. In addition, the peak intensity ratio of the blue light, the green light, and the red light in the white light emitted from the light emitting diode may be 1.6: 1: 1.9.

As described above, the liquid crystal display according to the present invention optimizes the optical characteristics of the backlight unit emitting white light by using a light emitting diode and the optical characteristics of each of the red color filter, the green color filter, and the blue color filter. It works.

First, there is an effect that the white balance, color reproducibility and luminance of the liquid crystal display can be improved.

Second, there is an effect that can match the AdobeRGB color space of the liquid crystal display.

Third, the image quality of the liquid crystal display may be improved by preventing redishness at the left and right viewing angles.

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

3 is an exploded perspective view for schematically illustrating a liquid crystal display according to a first embodiment of the present invention.

Referring to FIG. 3, the liquid crystal display according to the first exemplary embodiment of the present invention includes a liquid crystal display panel 100 configured to include color filters of red, green, and blue; And a backlight unit 200 which irradiates the liquid crystal display panel 100 with white light emitted from red, green, and blue light emitting diodes.

The liquid crystal display panel 100 includes a liquid crystal layer (not shown) formed between the thin film transistor array substrate 110 and the color filter array substrate 120.

The thin film transistor array substrate 110 includes a thin film transistor (not shown) formed in each sub pixel region of a unit pixel defined by a plurality of gate lines (not shown) and a plurality of data lines (not shown). The thin film transistor array substrate 110 controls the light transmittance of the liquid crystal layer by switching the thin film transistors according to the gate pulses supplied to the gate lines to supply data voltages supplied to the data lines to the subpixels. For this purpose, the unit pixel may be composed of red, green, and blue subpixels.

The liquid crystal layer is formed between the thin film transistor array substrate 110 and the color filter array substrate 120 to adjust the amount of white light incident from the backlight unit 200 according to the driving of each subpixel.

The color filter array substrate 120 is bonded to face the thin film transistor array substrate 110 to convert white light incident through the liquid crystal layer of each sub-pixel into red light, green light, and blue light to convert a predetermined color light into a predetermined color light. Emits. Such a detailed description of the color filter array substrate 120 will be described later.

As described above, the liquid crystal display panel 100 drives the liquid crystal layer according to the data voltage supplied to each sub-pixel to adjust the amount of white light transmitted from the backlight unit 200 to pass through the liquid crystal layer. A predetermined color image is displayed by combining the emitted red light, green light, and blue light.

The backlight unit 200 may include a light source unit 210; And a plurality of optical members 220.

The light source unit 210 generates white light using a plurality of light emitting diode units having light emitting diodes. To this end, the light source unit 210 includes a light guide plate 212; Light emitting diode array 214; And a reflective sheet 216.

The light guide plate 212 is formed in a flat plate shape to have a light incident surface provided on one side thereof, and is disposed on the rear surface of the liquid crystal display panel 100. The light guide plate 212 propagates the white light incident from the light emitting diode array 214 through the light incident surface in the upward direction to uniformly irradiate the entire surface of the liquid crystal display panel 100.

The light emitting diode array 214 is disposed on the side surface of the light guide plate 212 so as to face the light incident surface of the light guide plate 212 and irradiates white light to the light incident surface. To this end, the light emitting diode array 214 includes a printed circuit board 214a and a plurality of light emitting diodes 214b.

The printed circuit board 214a is disposed on the side of the light guide plate 212 to face the light incident surface of the light guide plate 212 to supply driving power to each of the plurality of light emitting diodes 214b.

Each of the plurality of light emitting diodes 214b is disposed on the printed circuit board 214a at predetermined intervals to emit light by driving power supplied from the printed circuit board 214a to generate white light, and to generate the white light. ) Is irradiated to the light incident surface. In this case, each of the plurality of light emitting diodes 214b is configured in a package form and mounted on the printed circuit board 214a to emit white light generated by combining red light, green light, and blue light according to the white balance. The chip may be configured to be mounted on the printed circuit board 214a.

Meanwhile, the white light emitted from each of the plurality of light emitting diodes 214b may be set to have an emission spectrum as shown in FIG. 4. In this case, the color coordinates (x, y) of the white light may be set to (0.294, 0.268).

In addition, in the spectrum of the white light emitted from each of the plurality of light emitting diodes 214b, the blue light BL has a peak wavelength of 450 nm, the green light GL has a peak wavelength of 530 nm, and the red light RL It may have a peak wavelength of 630nm. In this case, the peak intensity ratio of the blue light BL, the green light GL, and the red light RL is preferably 1.6: 1: 1.9.

As such, the light emitting diode array 214 irradiates the light incident surface of the light guide plate 212 with white light emitted from each of the plurality of light emitting diodes 214b to have light emission spectral characteristics shown in FIG. 4.

Again, in FIG. 2, the reflective sheet 216 is disposed on the rear surface of the light guide plate 212 to minimize the loss of white light by reflecting the light incident through the rear surface of the light guide plate 212 toward the light guide plate 212.

The plurality of optical members 220 are disposed on the light guide plate 212 to improve luminance characteristics of the white light incident from the light guide plate 212 and emit them to the outside. To this end, the plurality of optical sheets 220 may include a lower diffusion sheet 222, a lower prism sheet 224, an upper prism sheet 226, and an upper diffusion sheet 228.

The lower diffusion sheet 222 is disposed on the light guide plate 212 and diffuses white light incident from the light guide plate 212 to emit to the lower prism sheet 224.

The lower prism sheet 224 is disposed on the lower diffusion sheet 222 to collect white light incident from the lower diffusion sheet 222 in the first direction to irradiate the upper prism sheet 226. Here, the first direction may correspond to the long side or short side direction of the light guide plate 212.

The upper prism sheet 226 is disposed on the lower prism sheet 224 to condense irradiated white light incident from the lower prism sheet 224 in the second direction to irradiate the upper diffusion sheet 228. Here, the second direction may be a direction orthogonal to the first direction. This upper prism sheet 226 may be omitted.

The upper diffusion sheet 228 is disposed on the upper prism sheet 226 to diffuse white light incident from the upper prism sheet 226 and emit the white light to the liquid crystal display panel 100. In this case, when the upper prism sheet 226 is omitted, the upper diffusion sheet 228 is disposed on the lower prism sheet 224 to diffuse white light incident from the lower prism sheet 224 to thereby form the liquid crystal display panel 100. Can be released.

5 is a diagram for schematically describing a color filter array substrate in a liquid crystal display according to an exemplary embodiment of the present invention.

5 and 3, the color filter array substrate 120 includes a red color filter 124R, a green color filter 124G, a blue color filter 124B, and a black block formed on the substrate 122. Matrix 126, and coating layer 128.

Each of the red color filter 124R, the green color filter 124G, and the blue color filter 124B has optical characteristics optimized for the emission spectrum of the white light emitted and irradiated from the backlight unit 200 shown in FIG. It is formed to. The optical characteristics of the red color filter 124R, the green color filter 124G, and the blue color filter 124B are transmitted through the red color filter 124R, the green color filter 124G, and the blue color filter 124B, respectively. It may be a wavelength position corresponding to half the peak intensity or a width corresponding to half the peak intensity in the spectrum.

In detail, the red color filter 124R is formed to correspond to the red sub-pixel and emits red light by transmitting the light corresponding to the wavelength band of the red light of the wavelength band of the white light incident through the liquid crystal layer. At this time, the red color filter 124R is set so that the wavelength position corresponding to half of the peak intensity is 580 nm or more, as can be seen from the emission spectrum of the white light and the transmission spectrum of the red color filter 124R shown in FIG. 6. 6, the wavelength corresponding to half of the peak intensity of the red color filter 124R is less than 580 nm, and the light corresponding to the wavelength band of the green light included in the white light is included in the red color filter 124R. By passing through the light, red color coordinates deteriorate in characteristics, thereby degrading color reproducibility.

The green color filter 124G is formed to correspond to the green subpixel, and transmits light corresponding to the wavelength band of the green light among the wavelength bands of the white light incident through the liquid crystal layer to emit green light. At this time, the green color filter 124G may have a wavelength position corresponding to half of the peak intensity of 480 nm or more and 570 nm or less, as can be seen from the emission spectrum of the white light and the transmission spectrum of the green color filter 124G shown in FIG. 7. Is set. Here, when the wavelength position corresponding to half of the peak intensity in the green color filter 124G is less than 480 nm, the green color filter 124G transmits light corresponding to the wavelength band of the blue light included in the white light, thereby causing the green color coordinates. The characteristic is deteriorated and the color reproducibility is lowered. In addition, when the wavelength position corresponding to half of the peak intensity of the green color filter 124G is 570 nm or more, the green color filter 124G transmits light corresponding to the wavelength band of the red light included in the white light, thereby causing green color coordinates. The characteristic is deteriorated and the color reproducibility is lowered. As a result, the width of the portion corresponding to half of the peak intensity of the green color filter 124G is preferably about 90 nm.

The blue color filter 124B is formed to correspond to the blue subpixel, and transmits light corresponding to the wavelength band of the blue light among the wavelength bands of the white light incident through the liquid crystal layer to emit blue light. At this time, the blue color filter 124B is set so that the wavelength position corresponding to half of the peak intensity is 500 nm or less, as can be seen from the emission spectrum of the white light and the transmission spectrum of the blue color filter 124B shown in FIG. 8. . Here, when the wavelength position corresponding to half of the peak intensity in the blue color filter 124B is 500 nm or more, the blue color filter 124B transmits light corresponding to the wavelength band of the green light included in the white light, thereby providing a blue color coordinate. The characteristic is deteriorated and the color reproducibility is lowered.

The red color filter 124R, the green color filter 124G, and the blue color filter 124B each have optical characteristics optimized for the optical characteristics of the backlight unit 200, thereby improving color reproducibility and increasing luminance. Can be improved.

In FIG. 5, the black matrix 126 may separate the red color filter 124R, the green color filter 124G, and the blue color filter 124B, respectively, from the red color filter 124R, the green color filter 124G, and the blue color. It is formed every time between the filters 124B.

The coating layer 128 is formed to cover the red color filter 124R, the green color filter 124G, the blue color filter 124B, and the black matrix 126. The coating layer 128 is formed flat to remove the steps of the red color filter 124R, the green color filter 124G, the blue color filter 124B, and the black matrix 126 formed on the substrate 122. The alignment layer for alignment of the common electrode and the liquid crystal layer may be formed on the coating layer 128 according to the driving mode of the liquid crystal layer, or only the alignment layer may be formed without the common electrode.

As described above, the liquid crystal display according to the first exemplary embodiment of the present invention provides an optical characteristic of the backlight unit 200 that emits white light using a light emitting diode, a red color filter 124R, a green color filter 124G, By optimizing the optical characteristics of each of the blue color filters 124B, the color reproducibility can be improved as shown in FIG. 9 and the luminance can be improved as shown in FIG.

9 is a diagram illustrating color reproducibility of a liquid crystal display according to an exemplary embodiment of the present invention in color coordinate values.

As can be seen in FIG. 9, the color coordinate values of red (R), green (G), and blue (B) according to the color reproducibility of the liquid crystal display according to the exemplary embodiment of the present invention are formed in a triangle (RGB). By matching the triangle (RGB) corresponding to the NTSC standard, it can be seen that redishness generated in the left and right viewing angles is prevented and image quality is improved. This color reproducibility is 100% superimposed on the AdobeRGB standard.

10 is a diagram illustrating luminance of a liquid crystal display according to an exemplary embodiment of the present invention in color coordinate values.

As shown in FIG. 9, the triangle RGB formed by the color coordinate values of red (R), green (G), and blue (B) according to the luminance of the liquid crystal display according to the exemplary embodiment of the present invention in the CIE coordinate system is NTSC. By matching the triangle (RGB) corresponding to the standard it can be seen that the redish (Redish) generated in the left and right viewing angle is prevented to improve the brightness.

The liquid crystal display according to the first exemplary embodiment of the present invention may improve white balance, color reproducibility, and luminance by optimizing the optical characteristics of the liquid crystal display panel 100 and the backlight unit 200, and at the left and right viewing angles. It is possible to improve the image quality of the liquid crystal display by preventing redish and to match the AdobeRGB color space.

FIG. 11 is a diagram schematically illustrating a liquid crystal display according to a second exemplary embodiment of the present invention.

Referring to FIG. 11, a liquid crystal display according to a second exemplary embodiment of the present invention may include a liquid crystal display panel 100 configured to include color filters of red, green, and blue; And a backlight unit 300 that irradiates the liquid crystal display panel 100 with white light emitted from red, green, and blue light emitting diodes, wherein the backlight unit 300 includes a light source unit 310; And a plurality of optical members 220.

Since the liquid crystal display according to the second exemplary embodiment of the present invention has the same configuration as the above-described liquid crystal display of the first exemplary embodiment of the present invention except for the light source unit 310, a description of the same configuration will be omitted. The description will be replaced with the above description.

The light source unit 310 may include at least one light emitting diode array 312; And a diffusion plate 314.

The at least one light emitting diode array 312 includes a printed circuit board 312a and a plurality of light emitting diodes 312b disposed on the printed circuit board 312a at predetermined intervals.

The printed circuit board 310a is disposed to face the rear surface of the diffusion plate 314 to supply driving power to each of the plurality of light emitting diodes 312b.

Each of the plurality of light emitting diodes 312b is disposed on the printed circuit board 312a at predetermined intervals to emit light by driving power supplied from the printed circuit board 312a to generate white light, and to generate the white light. 314). In this case, each of the plurality of light emitting diodes 312b is configured in a package form and mounted on the printed circuit board 312a to generate and emit white light in which red light, green light, and blue light are combined according to the white balance. The chip may be configured to be mounted on the printed circuit board 312a.

Meanwhile, the white light emitted from each of the plurality of light emitting diodes 312b may be set to have an emission spectrum as shown in FIG. 4. In this case, the color coordinates (x, y) of the white light may be set to (0.294, 0.268).

In addition, in the spectrum of white light emitted from each of the plurality of light emitting diodes 312b, blue light BL has a peak wavelength of 450 nm, green light GL has a peak wavelength of 530 nm, and red light RL. May have a peak wavelength of 630 nm. In this case, the peak intensity ratio of the blue light BL, the green light GL, and the red light RL is preferably 1.6: 1: 1.9.

In FIG. 11 again, the diffusion plate 314 diffuses white light incident from the light emitting diode array 312 to the entire area and irradiates the plurality of optical members 230.

As described above, the liquid crystal display according to the second exemplary embodiment of the present invention has an optical characteristic of the backlight unit 300 that emits white light using a light emitting diode, a red color filter 124R, a green color filter 124G, By optimizing the optical characteristics of each of the blue color filters 124B, color reproducibility and brightness can be improved, white balance can be improved, and redish at the left and right viewing angles as shown in FIGS. 9 and 10. Can improve the image quality of the liquid crystal display and match the AdobeRGB color space.

Those skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, it is to be understood that the embodiments described above are exemplary in all respects and not restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. do.

1 is a diagram illustrating color reproducibility of a liquid crystal display according to the related art in color coordinate values.

2 is a diagram illustrating luminance of a liquid crystal display according to the related art in color coordinate values.

3 is an exploded perspective view for schematically illustrating a liquid crystal display according to a first embodiment of the present invention.

4 is a diagram illustrating an emission spectrum of white light emitted from the light emitting diode of FIG. 3.

FIG. 5 is a cross-sectional view illustrating a color filter array substrate according to the present invention shown in FIG. 3.

6 is a view for explaining the emission spectrum of the white light and the transmission spectrum of the red color filter according to the present invention.

7 is a view for explaining the emission spectrum of the white light and the transmission spectrum of the green color filter according to the present invention.

8 is a view for explaining the emission spectrum of the white light and the transmission spectrum of the blue color filter according to the present invention.

9 is a diagram illustrating color reproducibility of a liquid crystal display according to an exemplary embodiment of the present invention in color coordinate values.

10 is a diagram illustrating luminance of a liquid crystal display according to an exemplary embodiment of the present invention in color coordinate values.

11 is a diagram schematically illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

<Explanation of Signs of Major Parts of Drawings>

100: liquid crystal display 110: thin film transistor array substrate

120: color filter array substrate 124R: red color filter

124G: Green Color Filter 124B: Blue Color Filter

126: black matrix 128: coating layer

200, 300: backlight unit 210, 310: light source unit

212: Light guide plate 214, 312: Light emitting diode array

220: optical member 314: diffuser plate

Claims (10)

A liquid crystal display panel configured to include red, green, and blue color filters; And A backlight unit for generating white light using a light emitting diode and irradiating the generated white light to the liquid crystal display panel; The red color filter has a wavelength position corresponding to half of the peak intensity of 580 nm or more. The method of claim 1, The blue color filter has a wavelength position corresponding to half of the peak intensity of 500 nm or less. The method according to claim 1 or 2, The green color filter is a liquid crystal display, characterized in that the wavelength position corresponding to half of the peak intensity is 480nm or more and 570nm or less. The method of claim 3, wherein And wherein the green color filter has a width of 90 nm corresponding to half the peak intensity. The method of claim 3, wherein The backlight unit, A light source unit generating the white light by using the light emitting diode array including the plurality of light emitting diodes; And And a plurality of optical members which improve luminance characteristics of the white light emitted from the light source unit and irradiate the back surface of the liquid crystal display panel. The method of claim 5, The color coordinates (x, y) of the white light emitted from the light emitting diodes are (0.294, 0.268). The method of claim 5, Wherein the white light emitted from the light emitting diode comprises a blue peak wavelength of 450 nm, a green peak wavelength of 530 nm, and a red peak wavelength of 630 nm. The method of claim 5, And a peak intensity ratio of blue light, green light, and red light in the white light emitted from the light emitting diode is 1.6: 1: 1.9. The method of claim 5, The light source unit, A light guide plate configured to propagate the white light incident through the light incident surface provided on one side toward the liquid crystal display panel; And And a plurality of light emitting diode arrays disposed to face the light incident surface, the plurality of light emitting diodes emitting white light having a predetermined interval. The method of claim 5, The light source unit, At least one light emitting diode array disposed to face a rear surface of the liquid crystal display panel, the plurality of light emitting diodes emitting white light having a predetermined interval; And And a diffuser plate disposed on the light emitting diode array and configured to diffuse the white light incident from each light emitting diode to an entire area and irradiate the plurality of optical members.
KR1020090114893A 2009-11-26 2009-11-26 Liquid crystal display device KR20110058195A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115561931A (en) * 2022-08-23 2023-01-03 京东方科技集团股份有限公司 Quantum dot backlight module, backlight device and manufacturing method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115561931A (en) * 2022-08-23 2023-01-03 京东方科技集团股份有限公司 Quantum dot backlight module, backlight device and manufacturing method
CN115561931B (en) * 2022-08-23 2024-04-09 京东方科技集团股份有限公司 Quantum dot backlight module, backlight device and manufacturing method

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