WO2020125661A1 - Liquid crystal display backlight module and display screen - Google Patents

Liquid crystal display backlight module and display screen Download PDF

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Publication number
WO2020125661A1
WO2020125661A1 PCT/CN2019/126218 CN2019126218W WO2020125661A1 WO 2020125661 A1 WO2020125661 A1 WO 2020125661A1 CN 2019126218 W CN2019126218 W CN 2019126218W WO 2020125661 A1 WO2020125661 A1 WO 2020125661A1
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WO
WIPO (PCT)
Prior art keywords
color
light source
liquid crystal
crystal display
backlight module
Prior art date
Application number
PCT/CN2019/126218
Other languages
French (fr)
Chinese (zh)
Inventor
杨敏娜
李健林
Original Assignee
深圳Tcl新技术有限公司
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Publication of WO2020125661A1 publication Critical patent/WO2020125661A1/en

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    • 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
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • 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
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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
    • G02F1/133609—Direct backlight including means for improving the color mixing, e.g. white
    • 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
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Definitions

  • the present disclosure relates to the technical field of LED display, and particularly to a liquid crystal display backlight module.
  • HDR High Dynamic Range
  • high dynamic range technology is beginning to be used more and more, high brightness and high color gamut technology has become a research hotspot in the display industry.
  • the screen displayed by the high-brightness display device has more levels of brightness detail.
  • global dimming is generally used to achieve dynamic control, but for high-brightness screens, such as the reflection of glass in the sun, fireworks in the night sky, etc.
  • high-brightness screens such as the reflection of glass in the sun, fireworks in the night sky, etc.
  • the backlight design In order to achieve this effect, the backlight design generally considers the partition design of the entire light source scheme, that is, the local dynamic backlight (Local Dimming) technology.
  • the combination of high brightness and high color gamut can display more perfect colors, because the high color gamut display technology has the characteristics of wide number of colors, high color saturation, more vivid colors and more beautiful pictures than ordinary color gamut TVs. If the highlighted screen appears on a display device with a low color gamut, the screen will appear whitish, distorted, and unclear details.
  • the backlight has three LED chips of red, green and blue to form a mixed three-in-one chip, or red, green and blue LEDs as the backlight light source.
  • the technical solution has better effect and higher color gamut, which can be up to 95% BT2020.
  • the red, green, and blue LED chips are mixed with white light as a backlight, a color cast phenomenon occurs around the liquid crystal display panel.
  • the present disclosure proposes a liquid crystal display backlight module capable of solving the color cast around the liquid crystal display panel using red, green and blue LEDs as the backlight.
  • a liquid crystal display backlight module is a direct type backlight module, including a back plate, an LED backlight light source, a reflection sheet, a diffusion plate and an optical film group; the LED backlight light source of the backlight module is red A color light source composed of LEDs, green LEDs, and blue LEDs.
  • the LED backlight light source is a light bar provided on a back plate.
  • a reflective sheet is attached to the inner surface of the back plate.
  • the diffusion plate and the optical film group are stacked.
  • the light exit surface of the LED backlight light source is characterized in that a color cast elimination layer is provided around the reflection sheet or the diffuser plate, and the color cast elimination layer can absorb the color cast by the LED backlight light source The color and/or the compensation color that reflects the color cast by the LED backlight light source.
  • the color cast elimination layer provided on the periphery of the reflective sheet is a membrane provided on the periphery of the reflective surface of the reflective sheet or the oblique side of the back plate, and the absorption spectrum range of the membrane is the LED backlight light source For the color cast around, the reflection spectrum is the compensated color for the cast color.
  • the absorption spectrum of the diaphragm provided on the periphery of the reflective surface of the reflective sheet or the oblique side of the back plate is red light
  • the diaphragm The absorption red light wavelength range is between 580nm-780nm
  • the membrane reflection spectrum is blue-green light or cyan light
  • the membrane reflection blue-green light wavelength range is between 380nm-580nm or the reflection blue light wavelength range is 490nm ⁇ 5nm.
  • the absorption spectrum of the diaphragm provided on the periphery of the reflective surface of the reflective sheet or the oblique side of the back plate is green, and the film The reflection spectrum of the film is red and blue.
  • the color cast elimination layer provided on the periphery of the reflective sheet is an ink dot provided on the periphery of the reflective surface of the reflective sheet or the oblique edge of the back plate, and the color of the ink dot is set around the LED backlight light source The compensated color for the color cast.
  • the color of the surrounding color of the LED backlight light source is red
  • the color of the ink dots provided on the periphery of the reflective surface of the reflective sheet or the oblique side of the back plate is cyan
  • the spectrum of the cyan color The wavelength range is 490nm ⁇ 5nm.
  • the ink dots are circular, square, triangular, rhombic, or quadrangular, wherein the radius of the ink dots when they are circular is ⁇ 0.2 mm.
  • the absorption spectrum of the diaphragm provided on the periphery of the reflective surface of the reflective sheet or the oblique side of the back plate is green, and the film The reflection spectrum of the film is red and blue.
  • the color cast elimination layer provided on the periphery of the diffuser plate is a diaphragm provided on the periphery of the light incident surface of the diffuser plate, and the absorption spectrum range of the diaphragm is biased around the LED backlight light source
  • the color of the color, the reflection spectrum is the compensated color of the color cast.
  • the absorption spectrum of the diaphragm disposed around the light entrance surface of the diffusion plate is red light
  • the diaphragm absorbs red light in the wavelength range It is between 580nm-780nm
  • the reflection spectrum of the diaphragm is blue-green light or cyan light
  • the wavelength range of the reflection blue-green light of the diaphragm is between 380nm-580nm or the reflection blue light wavelength range is 490nm ⁇ 5nm.
  • the absorption spectrum of the diaphragm provided on the periphery of the reflective surface of the reflective sheet or the oblique side of the back plate is green, and the film The reflection spectrum of the film is red and blue.
  • the color cast elimination layer provided on the periphery of the diffuser plate is an ink dot provided on the periphery of the light incident surface of the diffuser plate, and the color of the ink dot is set to compensate for the color cast around the LED backlight light source colour.
  • the color of the surrounding color of the LED backlight light source is red
  • the color of the ink dots provided around the light incident surface of the diffusion plate is cyan
  • the spectral wavelength range of the cyan is 490 nm ⁇ 5nm.
  • the ink dots are circular, square, triangular, rhombic, or quadrangular, wherein the radius of the ink dots when they are circular is ⁇ 0.2 mm.
  • the present disclosure also provides a liquid crystal display screen including the above-mentioned liquid crystal display backlight module.
  • the liquid crystal display backlight module of the present disclosure can effectively solve the problem of color cast around the backlight module using the RGB color light source as the backlight source.
  • a film or ink dot that can absorb the color shifted by the LED backlight light source or compensate the color shifted by the LED backlight light source is arranged around the reflection surface of the reflection sheet in the backlight module or around the light incident surface of the diffusion plate, The diaphragm can absorb the color shifted by the LED backlight and reflect the compensated color of the shifted color.
  • the color of the ink dot is set as the compensation color of the shifted color of the LED backlight to eliminate the color shift around the LED backlight.
  • FIG. 1 is a schematic diagram of a cross-sectional structure principle of a prior art liquid crystal display backlight module (direct type).
  • FIG. 2 is a schematic diagram of the arrangement structure of the LED backlight light source (back panel LED light bar) of the prior art liquid crystal display backlight module.
  • FIG. 3 is a schematic diagram of a cross-sectional structure of a preferred embodiment of a liquid crystal display backlight module (direct type) of the present disclosure.
  • FIG. 4 is a schematic diagram of a cross-sectional structure of a preferred embodiment 2 of a liquid crystal display backlight module (direct type) of the present disclosure.
  • the backlight module is one of the key components of the LCD panel, and its function is to supply sufficient brightness and uniformly distributed light sources so that it can display images normally.
  • the luminous effect of the backlight will directly affect the visual effect of the LCD module.
  • the cost of the backlight accounts for 30-50% of the LCD module, and the power consumed accounts for 75% of the module. It can be said that it is a very important part of the LCD module. Components. With the advent of HDR technology, high brightness and high color gamut technology has become a hotspot in the display industry. The combination of high brightness and high color gamut can display more perfect colors.
  • FIG. 1 shows a schematic diagram of a cross-sectional structure of a prior art liquid crystal display backlight module.
  • the liquid crystal display backlight module is a direct type A backlight module, the direct type backlight module includes an optical film group 101, a diffusion plate 102, a reflection sheet and a back plate 103, an LED light bar 104 and a lens 105.
  • the LED backlight light source is a light bar provided on the reflective sheet and the back plate 103.
  • the reflective sheet and the back plate 103 are attached with a reflective sheet on the inner surface of the back plate.
  • the diffusion plate 102 and the optical film group 101 are stacked on the LED backlight The light exit surface of the light source.
  • the backlight light source used in the conventional direct-type backlight scheme is an LED white light source, that is, the LED lights arranged on the LED light bar 104 are white LED light sources.
  • LED white light source that is, the LED lights arranged on the LED light bar 104 are white LED light sources.
  • many LED backlight light sources of backlight modules now also use colored light sources composed of red LEDs, green LEDs, and blue LEDs. The arrangement of colored light bars is shown in Figure 2.
  • the prior art schematic diagram of the arrangement structure of the LED backlight light source (back panel LED light bar) of the liquid crystal display backlight module shows that the LED light bar 302 is evenly arranged on the reflective sheet and the back plate 301, and the LED lights 303 are evenly arranged in On the LED light bar, the LED light 303 uses a three-in-one color light source composed of a red LED, a green LED, and a blue LED.
  • the color of the periphery of this color light source will be caused by the red LED, green LED or blue LED at the edge, and the color cast area will appear on the periphery, as shown in Figure 2 .
  • the color cast area 100, 200, 300, 400
  • the color cast area 100, 200 , 300, 400
  • the color cast area 100, 200 , 300, 400
  • the color cast area 100, 200 , 300, 400
  • the present disclosure proposes a solution to reflect the color cast color or absorb the compensation color of the color cast color around the backlight light source, that is, around or around the reflective sheet
  • a color cast elimination layer is provided on the periphery of the diffusion plate, and the color cast elimination layer can absorb the color cast by the LED backlight light source and/or reflect the compensated color cast by the LED backlight light source.
  • FIG. 3 a schematic diagram of a cross-sectional structural principle of a preferred embodiment 1 of a liquid crystal display backlight module (direct type) of the present disclosure is implemented on the basis of the prior art direct type backlight module, including optical
  • the diaphragm group 101, the diffusion plate 102, the reflection sheet and the back plate 103, the LED light bar 104 and the lens 105 are composed.
  • the LED backlight light source is a plurality of light bars provided on the reflective sheet and the back plate 103.
  • the reflective sheet and the back plate 103 are attached with a reflective sheet on the inner surface of the back plate.
  • the shape of the back plate needs to be flanged at its periphery Beveled edges are formed; the diffusion plate 102 and the optical film group 101 are stacked on the light exit surface of the LED backlight light source, that is, the diffusion plate 102 is arranged opposite to the LED backlight light source.
  • the periphery of the reflective sheet is provided with a color cast elimination layer, where the periphery of the reflective sheet is the periphery of the reflective surface of the reflective sheet or the diaphragm 107 provided on the oblique side of the backplane.
  • this preferred embodiment 1 only shows A diaphragm 107 is provided on the periphery of the reflective surface of the reflective sheet to show the diaphragm 107 provided on the oblique side of the back plate; the absorption spectrum of the diaphragm 107 is the color of the color around the LED backlight light source, and the reflection spectrum is the partial Compensation color.
  • the absorption spectrum of the diaphragm provided on the periphery of the reflective surface of the reflective sheet or the oblique side of the back plate is red light
  • the wavelength range of the red light absorbed by the diaphragm is 580 nm
  • the reflection spectrum of the diaphragm is blue-green light or cyan light
  • the reflection wavelength range of the diaphragm is 380 nm-580 nm or the reflection cyan light wavelength range is 490 nm ⁇ 5 nm.
  • the color cast elimination layer provided on the periphery of the reflective sheet is an ink dot provided on the periphery of the reflective surface of the reflective sheet or the oblique side of the back plate, and the color of the ink dot is set to compensate for the color cast around the LED backlight light source colour.
  • the color of the surrounding color of the LED backlight light source is red
  • the color of the ink dots provided on the periphery of the reflective surface of the reflective sheet or the oblique side of the back plate is cyan
  • the spectral wavelength range of the cyan color is 490 nm ⁇ 5 nm.
  • the ink dots are circular, square, triangular, rhombic or quadrilateral, wherein the radius of the ink dots when circular is ⁇ 0.2mm.
  • FIG. 4 a schematic diagram of a cross-sectional structural principle of a preferred embodiment 2 of a liquid crystal display backlight module (direct type) of the present disclosure is implemented on the basis of the prior art direct type backlight module, including optical
  • the diaphragm group 101, the diffusion plate 102, the reflection sheet and the back plate 103, the LED light bar 104 and the lens 105 are composed.
  • the LED backlight light source is a plurality of light bars provided on the reflective sheet and the back plate 103.
  • the reflective sheet and the back plate 103 are attached with a reflective sheet on the inner surface of the back plate.
  • the shape of the back plate needs to be flanged at its periphery Beveled edges are formed; the diffusion plate 102 and the optical film group 101 are stacked on the light exit surface of the LED backlight light source, that is, the diffusion plate 102 is arranged opposite to the LED backlight light source.
  • the discoloration elimination layer provided on the periphery of the diffusion plate is a diaphragm 106 provided on the periphery of the light incident surface of the diffusion plate, and the light incident surface of the diffusion plate is the surface opposite to the LED backlight light source
  • the compensation colors are red and blue. If the color cast is blue, the compensation colors are red and green.
  • the absorption spectrum of the diaphragm disposed on the periphery of the light entrance surface of the diffusion plate is red light
  • the wavelength range of the red light absorbed by the diaphragm is between 580nm-780nm.
  • the reflection spectrum of the diaphragm is blue-green light or cyan light
  • the wavelength range of the reflection blue-green light of the diaphragm is between 380nm-580nm or the reflection blue light wavelength range is 490nm ⁇ 5nm.
  • the color cast elimination layer provided on the periphery of the diffuser plate is an ink dot provided on the periphery of the light incident surface of the diffuser plate, and the color of the ink dot is set as the compensation color of the color cast around the LED backlight light source.
  • the color of the surrounding color of the LED backlight light source is red
  • the color of the ink dots provided around the light incident surface of the diffusion plate is cyan
  • the spectral wavelength range of the cyan color is 490 nm ⁇ 5 nm.
  • the ink dots are circular, square, triangular, rhombic or quadrilateral, wherein the radius of the ink dots when circular is ⁇ 0.2mm.
  • the present disclosure also provides a liquid crystal display screen, which includes the above-mentioned liquid crystal display backlight module.
  • the above uses the film or ink dots arranged around the reflection sheet or the diffuser plate, through the principle of the targeted absorption of light and reflected light by the film, or by setting the ink dots as the compensated color for the color shift, to solve the problem of using red , Green and blue LED backlight light source causes color cast around the display area.

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

Abstract

A liquid crystal display backlight module. The backlight module is a direct-light-type backlight module, and comprises a backplane (103), an LED backlight source, a reflector plate, a diffuser plate (102) and an optical film assembly (101). The LED backlight source of the backlight module is a color light source consisting of a red LED, a green LED and a blue LED. The LED backlight source is a light bar (104) provided at the backplane (103). The reflector plate is attached to an inner surface of the backplane (103). The diffuser plate (102) and the optical film assembly (101) are stacked at a light emitting surface of the LED backlight source. A color cast correction layer is provided at a periphery of the reflector plate or a periphery of the diffuser plate (102). The color cast correction layer can absorb a tinted color of the LED backlight source and/or reflect a color compensating for the tinted color of the LED backlight source. The liquid crystal display backlight module can effectively resolve the issue of color cast at the periphery of a backlight module caused by using an RGB color light source as a backlight source.

Description

一种液晶显示背光模组及显示屏Liquid crystal display backlight module and display screen
优先权priority
所述PCT专利申请要求申请日为2018年12月21日，申请号为201811574706.3的中国专利优先权，本专利申请结合了上述专利的技术方案。The PCT patent application requires the application date to be December 21, 2018, and the Chinese patent priority of the application number 201811574706.3. This patent application combines the technical solutions of the above patents.
技术领域Technical field
本公开涉及LED显示技术领域，尤其涉及一种液晶显示背光模组。The present disclosure relates to the technical field of LED display, and particularly to a liquid crystal display backlight module.
背景技术Background technique
目前，在液晶显示技术领域，HDR(High Dynamic Range)高动态范围技术开始越来越多被使用，高亮度和高色域技术成为了显示行业研究的热点。高亮度显示设备所显示的画面更加具有亮度细节层次，目前一般选择用全局控光技术(Global Dimming)实现动态控制，但对于高亮度的画面，如玻璃在阳光下的反光，夜空中的烟花等，在显示画面中一般都不是整个显示画面的高亮，而是短时间、小面积的超高亮度。为了实现这种效果，背光设计时一般会考虑对整个光源方案进行分区设计，即局部动态背光(Local Dimming)技术。高亮度与高色域的结合才能显示更完美的色彩，因为高色域显示技术具有色彩数量广、色彩饱和度高、颜色较普通色域的电视更加生动、画质靓丽的特点。如果高亮的画面出现在色域不高的显示设备上时，会出现画面颜色发白、色彩失真、细节颜色不清楚的现象。对于高色域的显示技术而言，背光有采用红绿蓝三个LED芯片组成一个混合的三芯合一的芯片，或者采用红绿蓝LED作为背光光源，这种背光方案较其他高色域的技术方案效果更好，色域更高，可高达95％BT2020。但是，由于采用红绿蓝LED芯片混合白光来作为背光，在液晶显示面板的周边会出现偏色的现象。At present, in the field of liquid crystal display technology, HDR (High Dynamic Range) high dynamic range technology is beginning to be used more and more, high brightness and high color gamut technology has become a research hotspot in the display industry. The screen displayed by the high-brightness display device has more levels of brightness detail. Currently, global dimming is generally used to achieve dynamic control, but for high-brightness screens, such as the reflection of glass in the sun, fireworks in the night sky, etc. In the display screen, it is generally not the highlight of the entire display screen, but the ultra-high brightness in a short time and small area. In order to achieve this effect, the backlight design generally considers the partition design of the entire light source scheme, that is, the local dynamic backlight (Local Dimming) technology. The combination of high brightness and high color gamut can display more perfect colors, because the high color gamut display technology has the characteristics of wide number of colors, high color saturation, more vivid colors and more beautiful pictures than ordinary color gamut TVs. If the highlighted screen appears on a display device with a low color gamut, the screen will appear whitish, distorted, and unclear details. For high-gamut display technology, the backlight has three LED chips of red, green and blue to form a mixed three-in-one chip, or red, green and blue LEDs as the backlight light source. The technical solution has better effect and higher color gamut, which can be up to 95% BT2020. However, since the red, green, and blue LED chips are mixed with white light as a backlight, a color cast phenomenon occurs around the liquid crystal display panel.
因此，现有技术还有待于改进和发展。Therefore, the existing technology needs to be improved and developed.
发明内容Summary of the invention
鉴于上述现有技术的不足之处，本公开为解决现有技术缺陷和不足，提出了一种能够解决采用红绿蓝LED作为背光的液晶显示面板周边偏色问题的液晶显示背光模组。In view of the above shortcomings of the prior art, in order to solve the shortcomings and shortcomings of the prior art, the present disclosure proposes a liquid crystal display backlight module capable of solving the color cast around the liquid crystal display panel using red, green and blue LEDs as the backlight.
本公开解决技术问题所采用的技术方案如下：The technical solutions adopted by the present disclosure to solve the technical problems are as follows:
一种液晶显示背光模组，所述背光模组为直下式背光模组，包括背板、LED背光光源、反射片、扩散板和光学膜片组；所述背光模组的LED背光光源为红色LED、绿色LED、蓝色LED组成的彩色光源，所述LED背光光源为设置于背板上的灯条，所述背板的内面贴附反射片，所述扩散板和光学膜片组层叠设置于所述LED背光光源的出光面，其特征在于，所述反射片的周边或所述扩散板的周边设置有偏色消除层，该偏色消除层能够吸收所述LED背光光源所偏色的颜色和/或反射所述LED背光光源所偏色的补偿颜色。A liquid crystal display backlight module, the backlight module is a direct type backlight module, including a back plate, an LED backlight light source, a reflection sheet, a diffusion plate and an optical film group; the LED backlight light source of the backlight module is red A color light source composed of LEDs, green LEDs, and blue LEDs. The LED backlight light source is a light bar provided on a back plate. A reflective sheet is attached to the inner surface of the back plate. The diffusion plate and the optical film group are stacked. The light exit surface of the LED backlight light source is characterized in that a color cast elimination layer is provided around the reflection sheet or the diffuser plate, and the color cast elimination layer can absorb the color cast by the LED backlight light source The color and/or the compensation color that reflects the color cast by the LED backlight light source.
作为一种改进技术方案，所述反射片的周边设置的偏色消除层为在反射片反光面的周边或者背板的斜边设置的膜片，该膜片吸收光谱范围为所述LED背光光源四周所偏色的颜色，反射光谱为所偏色的补偿颜色。As an improved technical solution, the color cast elimination layer provided on the periphery of the reflective sheet is a membrane provided on the periphery of the reflective surface of the reflective sheet or the oblique side of the back plate, and the absorption spectrum range of the membrane is the LED backlight light source For the color cast around, the reflection spectrum is the compensated color for the cast color.
作为一种改进技术方案，当所述LED背光光源四周所偏色的颜色为红色时，所述反射片反光面的周边或者背板的斜边设置的膜片的吸收光谱为红光，膜片吸收红光波长范围为580nm-780nm之间，所述膜片反射光谱为蓝绿光或青色光，膜片反射蓝绿光波长范围为380nm-580nm之间或反射青色光波长范围为490nm±5nm。As an improved technical solution, when the color shifted around the LED backlight light source is red, the absorption spectrum of the diaphragm provided on the periphery of the reflective surface of the reflective sheet or the oblique side of the back plate is red light, and the diaphragm The absorption red light wavelength range is between 580nm-780nm, the membrane reflection spectrum is blue-green light or cyan light, the membrane reflection blue-green light wavelength range is between 380nm-580nm or the reflection blue light wavelength range is 490nm±5nm.
作为一种改进技术方案，当所述LED背光光源四周所偏色的颜色为绿色时，所述反射片反光面的周边或者背板的斜边设置的膜片的吸收光谱为绿色，所述膜片反射光谱为红色和蓝色。As an improved technical solution, when the color shifted around the LED backlight light source is green, the absorption spectrum of the diaphragm provided on the periphery of the reflective surface of the reflective sheet or the oblique side of the back plate is green, and the film The reflection spectrum of the film is red and blue.
作为一种改进技术方案，所述反射片的周边设置的偏色消除层为在反射片反光面的周边或者背板的斜边设置的油墨网点，该油墨网点颜色设置为所述LED背光光源四周所偏色的补偿颜色。As an improved technical solution, the color cast elimination layer provided on the periphery of the reflective sheet is an ink dot provided on the periphery of the reflective surface of the reflective sheet or the oblique edge of the back plate, and the color of the ink dot is set around the LED backlight light source The compensated color for the color cast.
作为一种改进技术方案，当所述LED背光光源四周所偏色的颜色为红色时，所述反射片反光面的周边或者背板的斜边设置的油墨网点的颜色为青色，该青色的光谱波长范围为490nm±5nm。As an improved technical solution, when the color of the surrounding color of the LED backlight light source is red, the color of the ink dots provided on the periphery of the reflective surface of the reflective sheet or the oblique side of the back plate is cyan, and the spectrum of the cyan color The wavelength range is 490nm±5nm.
作为一种改进技术方案，所述油墨网点为圆形、正方形、三角形、菱形或四边形，其中油墨网点为圆形时的半径≥0.2mm。As an improved technical solution, the ink dots are circular, square, triangular, rhombic, or quadrangular, wherein the radius of the ink dots when they are circular is ≥ 0.2 mm.
作为一种改进技术方案，当所述LED背光光源四周所偏色的颜色为绿色时，所述反射片反光面的周边或者背板的斜边设置的膜片的吸收光谱为绿色，所述膜片反射光谱为红色和蓝色。As an improved technical solution, when the color shifted around the LED backlight light source is green, the absorption spectrum of the diaphragm provided on the periphery of the reflective surface of the reflective sheet or the oblique side of the back plate is green, and the film The reflection spectrum of the film is red and blue.
作为一种改进技术方案，所述扩散板的周边设置的偏色消除层为在所述扩散板入光面的周边设置的膜片，该膜片吸收光谱范围为所述LED背光光源四周所偏色的颜色，反射光谱为所偏色的补偿颜色。As an improved technical solution, the color cast elimination layer provided on the periphery of the diffuser plate is a diaphragm provided on the periphery of the light incident surface of the diffuser plate, and the absorption spectrum range of the diaphragm is biased around the LED backlight light source The color of the color, the reflection spectrum is the compensated color of the color cast.
作为一种改进技术方案，当所述LED背光光源四周所偏色的颜色为红色时，所述扩散板入光面的周边设置的膜片的吸收光谱为红光，膜片吸收红光波长范围为580nm-780nm之间，所述膜片反射光谱为蓝绿光或青色光，膜片反射蓝绿光波长范围为380nm-580nm之间或反射青色光波长范围为490nm±5nm。As an improved technical solution, when the color cast around the LED backlight light source is red, the absorption spectrum of the diaphragm disposed around the light entrance surface of the diffusion plate is red light, and the diaphragm absorbs red light in the wavelength range It is between 580nm-780nm, the reflection spectrum of the diaphragm is blue-green light or cyan light, and the wavelength range of the reflection blue-green light of the diaphragm is between 380nm-580nm or the reflection blue light wavelength range is 490nm±5nm.
作为一种改进技术方案，当所述LED背光光源四周所偏色的颜色为绿色时，所述反射片反光面的周边或者背板的斜边设置的膜片的吸收光谱为绿色，所述膜片反射光谱为红色和蓝色。As an improved technical solution, when the color shifted around the LED backlight light source is green, the absorption spectrum of the diaphragm provided on the periphery of the reflective surface of the reflective sheet or the oblique side of the back plate is green, and the film The reflection spectrum of the film is red and blue.
作为一种改进技术方案，所述扩散板的周边设置的偏色消除层为在扩散板入光面的周边设置的油墨网点，该油墨网点颜色设置为所述LED背光光源四周所偏色的补偿颜色。As an improved technical solution, the color cast elimination layer provided on the periphery of the diffuser plate is an ink dot provided on the periphery of the light incident surface of the diffuser plate, and the color of the ink dot is set to compensate for the color cast around the LED backlight light source colour.
作为一种改进技术方案，当所述LED背光光源四周所偏色的颜色为红色时，所述扩散板入光面的周边设置的油墨网点的颜色为青色，该青色的光谱波长范围为490nm±5nm。As an improved technical solution, when the color of the surrounding color of the LED backlight light source is red, the color of the ink dots provided around the light incident surface of the diffusion plate is cyan, and the spectral wavelength range of the cyan is 490 nm± 5nm.
作为一种改进技术方案，所述油墨网点为圆形、正方形、三角形、菱形或四边形，其中油墨网点为圆形时的半径≥0.2mm。As an improved technical solution, the ink dots are circular, square, triangular, rhombic, or quadrangular, wherein the radius of the ink dots when they are circular is ≥ 0.2 mm.
本公开还提供一种液晶显示屏，该液晶显示屏包括上述的液晶显示背光模组。The present disclosure also provides a liquid crystal display screen including the above-mentioned liquid crystal display backlight module.
相比现有技术仅采用LED白光作为背光源，本公开液晶显示背光模组能够有效解决采用RGB彩色光源作为背光源的背光模组的四周偏色问题。采用在背光模组中的反 射片的反射面四周或者扩散板的入光面四周设置能够吸收LED背光光源所偏色的颜色或者反射LED背光光源所偏色的补偿颜色的膜片或者油墨网点，膜片能够吸收LED背光光源所偏色的颜色，并反射所偏色的补偿颜色，油墨网点的颜色则设置为LED背光光源所偏色的补偿色，以消除LED背光光源四周所偏颜色现象。Compared with the prior art that only uses LED white light as the backlight source, the liquid crystal display backlight module of the present disclosure can effectively solve the problem of color cast around the backlight module using the RGB color light source as the backlight source. A film or ink dot that can absorb the color shifted by the LED backlight light source or compensate the color shifted by the LED backlight light source is arranged around the reflection surface of the reflection sheet in the backlight module or around the light incident surface of the diffusion plate, The diaphragm can absorb the color shifted by the LED backlight and reflect the compensated color of the shifted color. The color of the ink dot is set as the compensation color of the shifted color of the LED backlight to eliminate the color shift around the LED backlight.
附图说明BRIEF DESCRIPTION
图1是现有技术液晶显示背光模组(直下式)的截面结构原理示意图。FIG. 1 is a schematic diagram of a cross-sectional structure principle of a prior art liquid crystal display backlight module (direct type).
图2是现有技术液晶显示背光模组的LED背光光源(背板LED灯条)排布结构原理示意图。FIG. 2 is a schematic diagram of the arrangement structure of the LED backlight light source (back panel LED light bar) of the prior art liquid crystal display backlight module.
图3是本公开一种液晶显示背光模组(直下式)优选实施例一的截面结构原理示意图。FIG. 3 is a schematic diagram of a cross-sectional structure of a preferred embodiment of a liquid crystal display backlight module (direct type) of the present disclosure.
图4是本公开一种液晶显示背光模组(直下式)优选实施例二的截面结构原理示意图。FIG. 4 is a schematic diagram of a cross-sectional structure of a preferred embodiment 2 of a liquid crystal display backlight module (direct type) of the present disclosure.
具体实施方式detailed description
为使本公开的目的、技术方案及优点更加清楚、明确，以下参照附图并举实施例对本公开进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本公开，并不用于限定本公开。In order to make the purpose, technical solutions and advantages of the disclosure more clear and unambiguous, the disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not intended to limit the present disclosure.
背光模组为液晶显示器面板的关键零组件之一，功能在于供应充足的亮度与分布均匀的光源，使其能正常显示影像。背光源的发光效果将直接影响到液晶显示模块视觉效果。背光源性能的好坏除了会直接影响LCD显像质量外，背光源的成本占LCD模块的30-50％，所消耗的电力更占模块的75％，可说是LCD模块中相当重要的零组件。随着HDR技术到来，高亮度和高色域技术成为显示行业研究的热点。高亮度与高色域的结合才能显示更完美的色彩，高色域显示技术具有色彩数量广、色彩饱和度高、颜色较普通色域的电视更加生动、画质亮丽的特点。图1和图2所示为现有技术液晶显示背光模组的基本结构，图1所示是现有技术一种液晶显示背光模组的截面结构原理示意图，该 液晶显示背光模组为直下式背光模组，该直下式背光模组包括光学膜片组101、扩散板102、反射片及背板103、LED灯条104和透镜105组成。LED背光光源为设置于反射片及背板103上的灯条，反射片及背板103是在背板的内面贴附反射片，所述扩散板102和光学膜片组101层叠设置于LED背光光源的出光面。传统直下式背光方案所用的背光光源为LED白光光源，即LED灯条104上所布设的LED灯为白色的LED光源。为了达到高亮度、高色域的显示效果，现在很多背光模组的LED背光光源也会采用红色LED、绿色LED、蓝色LED组成的彩色光源，采用彩色光源灯条的排布方式如图2现有技术液晶显示背光模组的LED背光光源(背板LED灯条)排布结构原理示意图所示，LED灯条302被均匀布设在反射片及背板301上，LED灯303均匀地排列在LED灯条上，LED灯303采用红色LED、绿色LED和蓝色LED组成的三芯合一的彩色光源。而此种彩色光源的周边会因为边缘位置的红色LED、绿色LED或蓝色LED而导致周缘出现偏色区域，如图2中所示背光光源周边偏色区域(100、200、300、400)，当靠近边缘区域的LED为红色LED时，所述偏色区域(100、200、300、400)则偏红，当靠近边缘区域的LED为绿色LED时，所述偏色区域(100、200、300、400)则偏绿，当靠近边缘区域的LED为蓝色LED时，所述偏色区域(100、200、300、400)则偏蓝。为了解决背光光源四周偏色的问题，本公开提出在背光光源的四周对偏色的颜色进行反射或对偏色的颜色的补偿色进行吸收的解决方案，即在所述反射片的周边或所述扩散板的周边设置偏色消除层，该偏色消除层能够吸收所述LED背光光源所偏色的颜色和/或反射所述LED背光光源所偏色的补偿颜色。The backlight module is one of the key components of the LCD panel, and its function is to supply sufficient brightness and uniformly distributed light sources so that it can display images normally. The luminous effect of the backlight will directly affect the visual effect of the LCD module. In addition to the quality of the backlight, in addition to directly affecting the quality of the LCD display, the cost of the backlight accounts for 30-50% of the LCD module, and the power consumed accounts for 75% of the module. It can be said that it is a very important part of the LCD module. Components. With the advent of HDR technology, high brightness and high color gamut technology has become a hotspot in the display industry. The combination of high brightness and high color gamut can display more perfect colors. High color gamut display technology has the characteristics of wide number of colors, high color saturation, more vivid colors and brighter picture quality than ordinary color gamut TVs. 1 and 2 show the basic structure of a prior art liquid crystal display backlight module. FIG. 1 shows a schematic diagram of a cross-sectional structure of a prior art liquid crystal display backlight module. The liquid crystal display backlight module is a direct type A backlight module, the direct type backlight module includes an optical film group 101, a diffusion plate 102, a reflection sheet and a back plate 103, an LED light bar 104 and a lens 105. The LED backlight light source is a light bar provided on the reflective sheet and the back plate 103. The reflective sheet and the back plate 103 are attached with a reflective sheet on the inner surface of the back plate. The diffusion plate 102 and the optical film group 101 are stacked on the LED backlight The light exit surface of the light source. The backlight light source used in the conventional direct-type backlight scheme is an LED white light source, that is, the LED lights arranged on the LED light bar 104 are white LED light sources. In order to achieve the display effect of high brightness and high color gamut, many LED backlight light sources of backlight modules now also use colored light sources composed of red LEDs, green LEDs, and blue LEDs. The arrangement of colored light bars is shown in Figure 2. The prior art schematic diagram of the arrangement structure of the LED backlight light source (back panel LED light bar) of the liquid crystal display backlight module shows that the LED light bar 302 is evenly arranged on the reflective sheet and the back plate 301, and the LED lights 303 are evenly arranged in On the LED light bar, the LED light 303 uses a three-in-one color light source composed of a red LED, a green LED, and a blue LED. The color of the periphery of this color light source will be caused by the red LED, green LED or blue LED at the edge, and the color cast area will appear on the periphery, as shown in Figure 2 , When the LED near the edge area is a red LED, the color cast area (100, 200, 300, 400) is reddish, when the LED near the edge area is a green LED, the color cast area (100, 200 , 300, 400) is greenish, when the LED near the edge area is a blue LED, the color cast area (100, 200, 300, 400) is blueish. In order to solve the problem of color deviation around the backlight light source, the present disclosure proposes a solution to reflect the color cast color or absorb the compensation color of the color cast color around the backlight light source, that is, around or around the reflective sheet A color cast elimination layer is provided on the periphery of the diffusion plate, and the color cast elimination layer can absorb the color cast by the LED backlight light source and/or reflect the compensated color cast by the LED backlight light source.
实施例一：Example one:
如图3本公开一种液晶显示背光模组(直下式)优选实施例一的截面结构原理示意图所示，该直下式背光模组在现有技术直下式背光模组的基础上实现，包括光学膜片组101、扩散板102、反射片及背板103、LED灯条104和透镜105组成。LED背光光源为设置于反射片及背板103上的若干灯条，反射片及背板103是在背板的内面贴附反射片，为了反光效果，背板的形状设置需要在其周缘翻边形成斜边；所述扩散板102和光学膜片组101层叠设置于LED背光光源的出光面，即扩散板102与LED背光光源相对 设置。As shown in FIG. 3, a schematic diagram of a cross-sectional structural principle of a preferred embodiment 1 of a liquid crystal display backlight module (direct type) of the present disclosure is implemented on the basis of the prior art direct type backlight module, including optical The diaphragm group 101, the diffusion plate 102, the reflection sheet and the back plate 103, the LED light bar 104 and the lens 105 are composed. The LED backlight light source is a plurality of light bars provided on the reflective sheet and the back plate 103. The reflective sheet and the back plate 103 are attached with a reflective sheet on the inner surface of the back plate. In order to reflect the light, the shape of the back plate needs to be flanged at its periphery Beveled edges are formed; the diffusion plate 102 and the optical film group 101 are stacked on the light exit surface of the LED backlight light source, that is, the diffusion plate 102 is arranged opposite to the LED backlight light source.
所述反射片的周边设置有偏色消除层，此处反射片的周边为反射片反光面的周边或者背板的斜边设置的膜片107，作为示例，本优选实施例一仅示出了反射片反光面的周边设置了膜片107，为示出背板斜边设置的膜片107；该膜片107吸收光谱范围为所述LED背光光源四周所偏色的颜色，反射光谱为所偏色的补偿颜色。由于采用了红色、绿色和蓝色LED作为背光光源，本公开中所说的补偿颜色是根据补色法，即红色+绿色+蓝色＝白色的方法进行补色，如果偏色为红色，则补偿颜色为绿色和蓝色，如果偏色为绿色，则补偿颜色为红色和蓝色，如果偏色为蓝色，则补偿颜色为红色和绿色。当所述LED背光光源四周所偏色的颜色为红色时，所述反射片反光面的周边或者背板的斜边设置的膜片的吸收光谱为红光，膜片吸收红光波长范围为580nm-780nm之间，所述膜片反射光谱为蓝绿光或青色光，膜片反射蓝绿光波长范围为380nm-580nm之间或反射青色光波长范围为490nm±5nm。The periphery of the reflective sheet is provided with a color cast elimination layer, where the periphery of the reflective sheet is the periphery of the reflective surface of the reflective sheet or the diaphragm 107 provided on the oblique side of the backplane. As an example, this preferred embodiment 1 only shows A diaphragm 107 is provided on the periphery of the reflective surface of the reflective sheet to show the diaphragm 107 provided on the oblique side of the back plate; the absorption spectrum of the diaphragm 107 is the color of the color around the LED backlight light source, and the reflection spectrum is the partial Compensation color. Since red, green, and blue LEDs are used as the backlight light source, the compensation color mentioned in the present disclosure is based on the complementary color method, that is, red + green + blue = white method. If the partial color is red, the compensation color It is green and blue. If the color cast is green, the compensation colors are red and blue. If the color cast is blue, the compensation colors are red and green. When the color of the surrounding color of the LED backlight light source is red, the absorption spectrum of the diaphragm provided on the periphery of the reflective surface of the reflective sheet or the oblique side of the back plate is red light, and the wavelength range of the red light absorbed by the diaphragm is 580 nm Between -780 nm, the reflection spectrum of the diaphragm is blue-green light or cyan light, and the reflection wavelength range of the diaphragm is 380 nm-580 nm or the reflection cyan light wavelength range is 490 nm±5 nm.
或者，所述反射片的周边设置的偏色消除层为在反射片反光面的周边或者背板的斜边设置的油墨网点，该油墨网点颜色设置为所述LED背光光源四周所偏色的补偿颜色。当所述LED背光光源四周所偏色的颜色为红色时，所述反射片反光面的周边或者背板的斜边设置的油墨网点的颜色为青色，该青色的光谱波长范围为490nm±5nm。所述油墨网点为圆形、正方形、三角形、菱形或四边形，其中油墨网点为圆形时的半径≥0.2mm。Alternatively, the color cast elimination layer provided on the periphery of the reflective sheet is an ink dot provided on the periphery of the reflective surface of the reflective sheet or the oblique side of the back plate, and the color of the ink dot is set to compensate for the color cast around the LED backlight light source colour. When the color of the surrounding color of the LED backlight light source is red, the color of the ink dots provided on the periphery of the reflective surface of the reflective sheet or the oblique side of the back plate is cyan, and the spectral wavelength range of the cyan color is 490 nm±5 nm. The ink dots are circular, square, triangular, rhombic or quadrilateral, wherein the radius of the ink dots when circular is ≥0.2mm.
实施例二：Example two:
如图4本公开一种液晶显示背光模组(直下式)优选实施例二的截面结构原理示意图所示，该直下式背光模组在现有技术直下式背光模组的基础上实现，包括光学膜片组101、扩散板102、反射片及背板103、LED灯条104和透镜105组成。LED背光光源为设置于反射片及背板103上的若干灯条，反射片及背板103是在背板的内面贴附反射片，为了反光效果，背板的形状设置需要在其周缘翻边形成斜边；所述扩散板102和光学膜片组101层叠设置于LED背光光源的出光面，即扩散板102与LED背光光源相对设置。As shown in FIG. 4, a schematic diagram of a cross-sectional structural principle of a preferred embodiment 2 of a liquid crystal display backlight module (direct type) of the present disclosure is implemented on the basis of the prior art direct type backlight module, including optical The diaphragm group 101, the diffusion plate 102, the reflection sheet and the back plate 103, the LED light bar 104 and the lens 105 are composed. The LED backlight light source is a plurality of light bars provided on the reflective sheet and the back plate 103. The reflective sheet and the back plate 103 are attached with a reflective sheet on the inner surface of the back plate. In order to reflect the light, the shape of the back plate needs to be flanged at its periphery Beveled edges are formed; the diffusion plate 102 and the optical film group 101 are stacked on the light exit surface of the LED backlight light source, that is, the diffusion plate 102 is arranged opposite to the LED backlight light source.
与上述优选实施例一同理，所述扩散板的周边设置的偏色消除层为在所述扩散板入 光面的周边设置的膜片106，扩散板入光面即为相对LED背光光源的表面，该膜片106吸收光谱范围为所述LED背光光源四周所偏色的颜色，反射光谱为所偏色的补偿颜色。由于采用了红色、绿色和蓝色LED作为背光光源，本公开中所说的补偿颜色是根据补色法，即红色+绿色+蓝色＝白色的方法进行补色，如果偏色为红色，则补偿颜色为绿色和蓝色，如果偏色为绿色，则补偿颜色为红色和蓝色，如果偏色为蓝色，则补偿颜色为红色和绿色。当所述LED背光光源四周所偏色的颜色为红色时，所述扩散板入光面的周边设置的膜片的吸收光谱为红光，膜片吸收红光波长范围为580nm-780nm之间，所述膜片反射光谱为蓝绿光或青色光，膜片反射蓝绿光波长范围为380nm-580nm之间或反射青色光波长范围为490nm±5nm。In the same way as the above preferred embodiment, the discoloration elimination layer provided on the periphery of the diffusion plate is a diaphragm 106 provided on the periphery of the light incident surface of the diffusion plate, and the light incident surface of the diffusion plate is the surface opposite to the LED backlight light source The absorption spectrum range of the diaphragm 106 is the color shifted around the LED backlight light source, and the reflection spectrum is the compensated color shifted by the color shift. Since red, green, and blue LEDs are used as the backlight light source, the compensation color mentioned in the present disclosure is based on the complementary color method, that is, red + green + blue = white method. If the partial color is red, the compensation color It is green and blue. If the color cast is green, the compensation colors are red and blue. If the color cast is blue, the compensation colors are red and green. When the color of the surrounding color of the LED backlight light source is red, the absorption spectrum of the diaphragm disposed on the periphery of the light entrance surface of the diffusion plate is red light, and the wavelength range of the red light absorbed by the diaphragm is between 580nm-780nm. The reflection spectrum of the diaphragm is blue-green light or cyan light, and the wavelength range of the reflection blue-green light of the diaphragm is between 380nm-580nm or the reflection blue light wavelength range is 490nm±5nm.
或者，所述扩散板的周边设置的偏色消除层为在扩散板入光面的周边设置的油墨网点，该油墨网点颜色设置为所述LED背光光源四周所偏色的补偿颜色。当所述LED背光光源四周所偏色的颜色为红色时，所述扩散板入光面的周边设置的油墨网点的颜色为青色，该青色的光谱波长范围为490nm±5nm。所述油墨网点为圆形、正方形、三角形、菱形或四边形，其中油墨网点为圆形时的半径≥0.2mm。Alternatively, the color cast elimination layer provided on the periphery of the diffuser plate is an ink dot provided on the periphery of the light incident surface of the diffuser plate, and the color of the ink dot is set as the compensation color of the color cast around the LED backlight light source. When the color of the surrounding color of the LED backlight light source is red, the color of the ink dots provided around the light incident surface of the diffusion plate is cyan, and the spectral wavelength range of the cyan color is 490 nm±5 nm. The ink dots are circular, square, triangular, rhombic or quadrilateral, wherein the radius of the ink dots when circular is ≥0.2mm.
实施例三Example Three
本公开还提供了一种液晶显示屏，该液晶显示屏包括上述的液晶显示背光模组，工作原理参照上述液晶显示背光模组，不赘述。The present disclosure also provides a liquid crystal display screen, which includes the above-mentioned liquid crystal display backlight module.
以上通过在反射片或扩散板的周边设置的膜片或油墨网点，通过膜片有针对性的吸收光和反射光的原理，或者通过设置油墨网点为所偏色的补偿颜色，以解决采用红色、绿色和蓝色LED的背光光源导致的显示区域周边偏色问题。The above uses the film or ink dots arranged around the reflection sheet or the diffuser plate, through the principle of the targeted absorption of light and reflected light by the film, or by setting the ink dots as the compensated color for the color shift, to solve the problem of using red , Green and blue LED backlight light source causes color cast around the display area.
应当理解的是，以上所述仅为本公开的较佳实施例而已，并不足以限制本公开的技术方案，对本领域普通技术人员来说，在本公开的精神和原则之内，可以根据上述说明加以增减、替换、变换或改进，而所有这些增减、替换、变换或改进后的技术方案，都应属于本公开所附权利要求的保护范围。It should be understood that the above is only the preferred embodiments of the present disclosure and is not sufficient to limit the technical solutions of the present disclosure. For those of ordinary skill in the art, within the spirit and principles of the present disclosure, the above It is stated that addition, subtraction, replacement, transformation or improvement is carried out, and all these technical solutions after addition, subtraction, replacement, transformation or improvement shall fall within the protection scope of the claims appended to this disclosure.

Claims (15)

  1. 一种液晶显示背光模组，所述背光模组为直下式背光模组，包括背板、LED背光光源、反射片、扩散板和光学膜片组；所述背光模组的LED背光光源为红色LED、绿色LED、蓝色LED组成的彩色光源，所述LED背光光源为设置于背板上的灯条，所述背板的内面贴附反射片，所述扩散板和光学膜片组层叠设置于所述LED背光光源的出光面，其特征在于，所述反射片的周边或所述扩散板的周边设置有偏色消除层，该偏色消除层能够吸收所述LED背光光源所偏色的颜色和/或反射所述LED背光光源所偏色的补偿颜色。A liquid crystal display backlight module, the backlight module is a direct type backlight module, including a back plate, an LED backlight light source, a reflection sheet, a diffusion plate and an optical film group; the LED backlight light source of the backlight module is red A color light source composed of LEDs, green LEDs, and blue LEDs. The LED backlight light source is a light bar provided on a back plate. A reflective sheet is attached to the inner surface of the back plate. The diffusion plate and the optical film group are stacked. The light exit surface of the LED backlight light source is characterized in that a color cast elimination layer is provided around the reflection sheet or the diffuser plate, and the color cast elimination layer can absorb the color cast by the LED backlight light source The color and/or the compensation color that reflects the color cast by the LED backlight light source.
  2. 根据权利要求1所述的一种液晶显示背光模组，其特征在于，所述反射片的周边设置的偏色消除层为在反射片反光面的周边或者背板的斜边设置的膜片，该膜片吸收光谱范围为所述LED背光光源四周所偏色的颜色，反射光谱为所偏色的补偿颜色。The liquid crystal display backlight module according to claim 1, wherein the color-shifting elimination layer provided on the periphery of the reflection sheet is a membrane provided on the periphery of the reflective surface of the reflection sheet or the oblique side of the back plate, The absorption spectrum range of the diaphragm is the color shifted around the LED backlight light source, and the reflection spectrum is the compensated color shifted by the color shift.
  3. 根据权利要求2所述的一种液晶显示背光模组，其特征在于，当所述LED背光光源四周所偏色的颜色为红色时，所述反射片反光面的周边或者背板的斜边设置的膜片的吸收光谱为红光，膜片吸收红光波长范围为580nm-780nm之间，所述膜片反射光谱为蓝绿光或青色光，膜片反射蓝绿光波长范围为380nm-580nm之间或反射青色光波长范围为490nm±5nm。The liquid crystal display backlight module according to claim 2, wherein when the color of the color cast around the LED backlight light source is red, the periphery of the reflective surface of the reflective sheet or the beveled edge of the back plate is provided The absorption spectrum of the diaphragm is red light, the wavelength range of the red light absorption of the diaphragm is between 580nm-780nm, the reflection spectrum of the diaphragm is blue-green light or cyan light, and the wavelength range of the blue light reflected by the diaphragm is 380nm-580nm The wavelength range of reflected cyan light is 490nm±5nm.
  4. 根据权利要求3所述的一种液晶显示背光模组，其特征在于，当所述LED背光光源四周所偏色的颜色为绿色时，所述反射片反光面的周边或者背板的斜边设置的膜片的吸收光谱为绿色，所述膜片反射光谱为红色和蓝色。The liquid crystal display backlight module according to claim 3, characterized in that, when the color cast around the LED backlight light source is green, the periphery of the reflective surface of the reflective sheet or the beveled edge of the back plate is provided The absorption spectrum of the diaphragm is green, and the reflection spectrum of the diaphragm is red and blue.
  5. 根据权利要求1所述的一种液晶显示背光模组，其特征在于，所述反射片的周边设置的偏色消除层为在反射片反光面的周边或者背板的斜边设置的油墨网点，该油墨网点颜色设置为所述LED背光光源四周所偏色的补偿颜色。The liquid crystal display backlight module according to claim 1, wherein the color cast elimination layer provided on the periphery of the reflective sheet is an ink dot provided on the periphery of the reflective surface of the reflective sheet or the oblique side of the back plate, The ink dot color is set as the compensation color of the color deviation around the LED backlight light source.
  6. 根据权利要求5所述的一种液晶显示背光模组，其特征在于，当所述LED背光光源四周所偏色的颜色为红色时，所述反射片反光面的周边或者背板的斜边设置的油墨网点的颜色为青色，该青色的光谱波长范围为490nm±5nm。The liquid crystal display backlight module according to claim 5, characterized in that, when the color of the color cast around the LED backlight light source is red, the periphery of the reflective surface of the reflective sheet or the beveled edge of the back plate is provided The color of the ink dots is cyan, and the spectral wavelength range of the cyan is 490nm±5nm.
  7. 根据权利要求6所述的一种液晶显示背光模组，其特征在于，当所述LED背光光源四周所偏色的颜色为绿色时，所述反射片反光面的周边或者背板的斜边设置的油墨 网点的吸收光谱为绿色，所述膜片反射光谱为红色和蓝色。The liquid crystal display backlight module according to claim 6, characterized in that, when the color of the color cast around the LED backlight light source is green, the periphery of the reflective surface of the reflective sheet or the beveled edge of the back plate is provided The absorption spectrum of the ink dots is green, and the reflection spectrum of the diaphragm is red and blue.
  8. 根据权利要求5-7任一项所述的一种液晶显示背光模组，其特征在于，所述油墨网点为圆形、正方形、三角形、菱形或四边形，其中油墨网点为圆形时的半径≥0.2mm。A liquid crystal display backlight module according to any one of claims 5-7, wherein the ink dots are circular, square, triangular, diamond or quadrilateral, wherein the radius when the ink dots are circular is ≥ 0.2mm.
  9. 根据权利要求1所述的一种液晶显示背光模组，其特征在于，所述扩散板的周边设置的偏色消除层为在所述扩散板入光面的周边设置的膜片，该膜片吸收光谱范围为所述LED背光光源四周所偏色的颜色，反射光谱为所偏色的补偿颜色。The liquid crystal display backlight module according to claim 1, wherein the color-shifting elimination layer provided around the diffusion plate is a diaphragm provided around the light incident surface of the diffusion plate, the diaphragm The absorption spectrum range is the color shifted around the LED backlight light source, and the reflection spectrum is the compensated color shifted by the color shift.
  10. 根据权利要求7所述的一种液晶显示背光模组，其特征在于，当所述LED背光光源四周所偏色的颜色为红色时，所述扩散板入光面的周边设置的膜片的吸收光谱为红光，膜片吸收红光波长范围为580nm-780nm之间，所述膜片反射光谱为蓝绿光或青色光，膜片反射蓝绿光波长范围为380nm-580nm之间或反射青色光波长范围为490nm±5nm。The liquid crystal display backlight module according to claim 7, wherein when the color of the LED backlight light source is red, the absorption of the diaphragm provided around the light entrance surface of the diffusion plate The spectrum is red light, the membrane absorbs red light in the wavelength range of 580nm-780nm, the membrane reflection spectrum is blue-green or cyan light, and the membrane reflects blue-green light in the wavelength range of 380nm-580nm or reflects cyan light The wavelength range is 490nm±5nm.
  11. 根据权利要求10所述的一种液晶显示背光模组，其特征在于，当所述LED背光光源四周所偏色的颜色为绿色时，所述扩散板入光面的周边设置的膜片的吸收光谱为绿色，所述膜片反射光谱为红色和蓝色。The liquid crystal display backlight module according to claim 10, characterized in that when the color of the color cast around the LED backlight light source is green, absorption of the diaphragm provided around the light incident surface of the diffusion plate The spectrum is green, and the reflection spectrum of the diaphragm is red and blue.
  12. 根据权利要求1所述的一种液晶显示背光模组，其特征在于，所述扩散板的周边设置的偏色消除层为在扩散板入光面的周边设置的油墨网点，该油墨网点颜色设置为所述LED背光光源四周所偏色的补偿颜色。The liquid crystal display backlight module according to claim 1, wherein the color cast elimination layer provided on the periphery of the diffusion plate is an ink dot provided on the periphery of the light incident surface of the diffusion plate, the ink dot color is set The compensation color for the color deviation around the LED backlight light source.
  13. 根据权利要求12所述的一种液晶显示背光模组，其特征在于，当所述LED背光光源四周所偏色的颜色为红色时，所述扩散板入光面的周边设置的油墨网点的颜色为青色，该青色的光谱波长范围为490nm±5nm。A liquid crystal display backlight module according to claim 12, wherein when the color of the color cast around the LED backlight light source is red, the color of the ink dots provided around the light incident surface of the diffusion plate It is cyan, and the spectral wavelength range of the cyan is 490 nm±5 nm.
  14. 根据权利要求12或13所述的一种液晶显示背光模组，其特征在于，所述油墨网点为圆形、正方形、三角形、菱形或四边形，其中油墨网点为圆形时的半径≥0.2mm。The liquid crystal display backlight module according to claim 12 or 13, wherein the ink dots are circular, square, triangular, rhombic or quadrangular, wherein the radius of the ink dots when they are circular is ≥0.2mm.
  15. 一种液晶显示屏，其特征在于，该液晶显示屏包括权利要求1至14任一项所述的液晶显示背光模组。A liquid crystal display, characterized in that the liquid crystal display comprises the liquid crystal display backlight module according to any one of claims 1 to 14.
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