WO2017036206A1 - 蓝光led直下式背光模组和液晶显示屏 - Google Patents

蓝光led直下式背光模组和液晶显示屏 Download PDF

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Publication number
WO2017036206A1
WO2017036206A1 PCT/CN2016/084238 CN2016084238W WO2017036206A1 WO 2017036206 A1 WO2017036206 A1 WO 2017036206A1 CN 2016084238 W CN2016084238 W CN 2016084238W WO 2017036206 A1 WO2017036206 A1 WO 2017036206A1
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Prior art keywords
reflective sheet
blue led
yellow
led lamp
dot
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PCT/CN2016/084238
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English (en)
French (fr)
Inventor
黄芳
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深圳Tcl新技术有限公司
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Publication of WO2017036206A1 publication Critical patent/WO2017036206A1/zh

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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
    • 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
    • G02F1/133603—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
    • G02F1/133606—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
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light

Definitions

  • the invention relates to the field of liquid crystal display technology, in particular to a blue LED direct-lit backlight module and a liquid crystal display.
  • the backlight module of the existing liquid crystal display screen is divided into two types: a direct type backlight module and a side-in type backlight module according to different backlight sources.
  • the flat display device is developing toward lighter and thinner.
  • the light mixing distance of the direct type backlight module is also shortened accordingly, and the shorting of the light mixing distance affects the effect of the light mixing, and the most intuitive performance. That is, after the liquid crystal display of the direct type backlight module with a short mixing distance is used, the brightness of the edge position of the liquid crystal display is significantly higher, and the edge bright frame problem is generated.
  • blue LED as the backlight can effectively improve the brightness of the light module.
  • the ratio of display color to NTSC color gamut can be increased from 75% to 100%, bringing more consumers. Good visual effects, so the blue LED backlight module will gradually become an industry trend; but when using the blue LED as the light source, the liquid crystal display with a short blending distance will also produce a bright border on the edge, and the edge is bright. It is blue and affects the display.
  • the main object of the present invention is to provide a blue LED direct-lit backlight module, which aims to improve the appearance of a bright blue frame on the edge of a liquid crystal display using a blue LED direct-lit backlight module due to a short light-mixing distance. .
  • the blue LED direct-lit backlight module of the present invention comprises an LED light source, a reflective sheet and a quantum dot film, wherein the LED light source comprises a blue LED lamp bead, and the blue LED lamp bead is disposed on the reflective sheet.
  • the quantum dot film is disposed above the blue LED lamp bead, and the edge of the reflective sheet is provided with a yellow dot, the yellow dot is used to scatter the blue light of the blue LED lamp to the yellow dot; among them,
  • the arrangement position of the yellow dot is calculated by Gtools lgp, Lighttools (lts) or Mathcad optical design software according to the aperture ratio a of the reflective sheet forming dot, wherein a is calculated by the following formula:
  • a S ⁇ 1(x,y)/D(x,y)b*L(x,y), where a is defined as the area of the yellow dot in the unit area divided by the area of the entire spot segment; S is (x) , y) the area of a dot; D is the grid area of the yellow dot at (x, y); ⁇ 1 (x, y) is the target luminous flux at (x, y); L (x, y) is no yellow The brightness of the light source at (x, y) when the dot is at the point; b is the conversion coefficient of the illuminance converted into the luminous flux;
  • the LED light source further includes a PCB board, the number of the blue LED lamp beads is several, and the plurality of the blue LED lamp bead arrays are arranged and electrically connected to the PCB board, and the reflective sheet corresponds to the plurality of A through hole is formed in the position of the blue LED lamp bead, and the reflective sheet is disposed on the PCB, and the blue LED lamp bead protrudes from the through hole to be disposed above the reflective sheet.
  • the yellow dots are formed on the reflective sheet by silk-screening of the formulated ink, and the formulated ink is prepared by blending yellow ink and white ink.
  • the reflective sheet is a split reflective sheet
  • the split reflective sheet includes a main reflective sheet and an auxiliary reflective sheet disposed around the main reflective sheet, and the yellow dot is disposed on the auxiliary reflective sheet.
  • the main reflection sheet is disposed in a rectangular shape
  • the auxiliary reflection sheet has four sheets
  • the four auxiliary reflection sheets are respectively spliced with the four sides of the main reflection sheet.
  • the invention also provides a blue LED direct-lit backlight module, comprising an LED light source, a reflective sheet and a quantum dot film, wherein the LED light source comprises a blue LED lamp bead, and the blue LED lamp bead is disposed on the reflective sheet, The quantum dot film is disposed above the blue LED lamp bead, and the edge of the reflective sheet is provided with a yellow dot to scatter the blue light of the blue LED lamp to the yellow dot.
  • the yellow dots are formed on the reflective sheet by silk-screening of the formulated ink, and the formulated ink is prepared by blending yellow ink and white ink.
  • the arrangement position of the yellow dot is calculated by Gtools lgp, Lighttools (lts) or Mathcad optical design software according to the aperture ratio a of the reflective sheet forming dot, wherein a is calculated by the following formula:
  • a S ⁇ 1(x,y)/D(x,y)b*L(x,y), where a is defined as the area of the yellow dot in the unit area divided by the area of the entire spot segment; S is (x) , y) the area of a dot; D is the grid area of the yellow dot at (x, y); ⁇ 1 (x, y) is the target luminous flux at (x, y); L (x, y) is no yellow The light source illuminates the brightness at (x, y) at the dot; b is the conversion coefficient of illuminance converted to luminous flux.
  • the LED light source further includes a PCB board, the number of the blue LED lamp beads is several, and the plurality of the blue LED lamp bead arrays are arranged and electrically connected to the PCB board, and the reflective sheet corresponds to the number A through hole is formed in the position of the blue LED lamp bead, and the reflective sheet is disposed on the PCB, and the blue LED lamp bead protrudes from the through hole to be disposed above the reflective sheet.
  • the blue LED direct-lit backlight module further includes a diffusing plate disposed above the quantum dot film and an optical film set disposed above the diffusing plate.
  • the reflective sheet is an integral reflective sheet.
  • the reflective sheet is a split reflective sheet
  • the split reflective sheet includes a main reflective sheet and an auxiliary reflective sheet disposed around the main reflective sheet, and the yellow dot is disposed on the auxiliary reflective sheet.
  • the main reflection sheet is arranged in a rectangle
  • the auxiliary reflection sheet has four pieces
  • the four pieces of the auxiliary reflection sheet are divided into four pieces. Do not splicing with the four sides of the main reflection sheet.
  • the invention also provides a liquid crystal display panel, comprising a blue LED direct-lit backlight module, wherein the blue LED direct-lit backlight module comprises an LED light source, a reflective sheet and a quantum dot film, and the LED light source comprises a blue LED lamp bead.
  • the blue LED lamp bead is disposed on the reflective sheet, and the quantum dot film is disposed above the blue LED lamp bead, and the edge of the reflective sheet is provided with a yellow dot.
  • the technical solution of the invention provides a yellow mesh point at the edge position of the reflective sheet.
  • the blue light is white after being reflected by the yellow dot, and the yellow dot can also absorb and scatter some of the light to reduce the brightness of the reflected light. It can effectively improve the phenomenon that the liquid crystal display using the blue LED direct-lit backlight module has a bright blue frame at the edge due to the short mixing distance, thereby improving the optical taste and improving the display effect.
  • FIG. 1 is a schematic structural view of an embodiment of a blue LED direct-lit backlight module according to the present invention
  • FIG. 2 is a schematic structural view of a reflective sheet of the blue LED direct type backlight module of FIG. 1;
  • FIG. 3 is a schematic structural view of a reflective sheet of another embodiment of a blue LED direct-lit backlight module of the present invention.
  • Label name Label name 100 LED light source 200 or 200’
  • a reflective sheet 300
  • Diffuser 500 Optical film set 120
  • Blue LED lamp beads 140
  • PCB board 220 Yellow dot 240 Through hole 210
  • Main reflection sheet 230 Auxiliary reflector
  • the invention provides a blue LED direct-lit backlight module, which improves the phenomenon that a blue bright frame is formed on the edge of the liquid crystal display using the blue LED direct-lit backlight module due to the short mixing distance.
  • the blue LED direct-lit backlight module includes an LED light source 100, a reflective sheet 200, and a quantum dot film 300.
  • the LED light source 100 includes a blue LED lamp bead 120, and the blue LED lamp bead 120 is disposed on the reflective sheet 200.
  • the quantum dot film 300 is disposed above the blue LED lamp bead 120.
  • the edge of the reflective sheet 200 is provided with a yellow dot 220.
  • the yellow dot 220 is used to scatter the blue LED lamp 120 to the yellow dot 220. Blu-ray.
  • the blue LED direct backlight module is prone to the bright blue edge of the edge, and the edge bright frame phenomenon is most prominent in the backlight module with a small light mixing distance (the light mixing distance is less than or equal to 18 mm). Therefore, the optical taste is seriously affected; therefore, in the present invention, for the bright edge of the blue color, the ink screen printing yellow dot 220 is used at the edge position of the reflective sheet 200.
  • the blue light is reflected by the yellow dot 220.
  • the yellow dot 220 can also absorb and scatter some of the light to reduce the brightness of the reflected light, so it can effectively improve the edge of the liquid crystal display using the blue LED direct-lit backlight module due to the short mixing distance.
  • the bright box phenomenon is not set, the blue LED direct backlight module is prone to the bright blue edge of the edge, and the edge bright frame phenomenon is most prominent in the backlight module with a small light mixing distance (the light mixing distance is less than or equal to 18 mm). Therefore, the optical taste is seriously affected; therefore, in the present invention
  • the yellow dots 220 are formed by silk-screening from the formulated ink onto the reflective sheet 200, and the formulated ink is prepared by blending the yellow ink with the white ink.
  • the yellow dot 220 is silk-printed onto the reflective sheet 200, and the operation is simple.
  • the blending ink is prepared by mixing yellow ink and white ink, wherein the yellow ink refers to a yellow ink for printing three primary colors, and the yellow ink and the white ink are blended to obtain a yellow shade.
  • the ink is formulated and printed to obtain a corresponding yellow dot 220.
  • the arrangement position of the yellow halftone dots 220 may affect the improvement effect.
  • the arrangement position of the yellow halftone dots 220 is calculated by Gtools lgp, Lighttools (lts) or Mathcad optical design software according to the aperture ratio a of the reflective sheet forming dots, wherein a is The following formula is calculated:
  • a S ⁇ (x,y)/D(x,y)b*L(x,y), where a is defined as the area of the yellow dot 220 in the unit area divided by the area of the entire spot segment; S is ( x, y) the area of a dot; D is the grid area of the yellow dot 220 at (x, y); ⁇ (x, y) is the luminous flux when there is no yellow dot 220 at (x, y); L ( x, y) is the luminance at which the light source is irradiated at (x, y) when there is no yellow dot 220; b is the conversion coefficient at which illuminance is converted into luminous flux.
  • a is defined as the aperture ratio of the reflection sheet forming the dot, and the aperture ratio is a fraction less than or equal to 1, and the value is mathematically defined by dividing the area of the dot area per unit area by the area of the entire reflection sheet dot area.
  • ⁇ 1(x, y) should be inversely proportional to the filling density function f(x, y) of the dot 200 of the reflection sheet 200 at (x, y), that is, f(x, y).
  • the larger the number of dots corresponding to (x, y), the less the luminous flux ⁇ 1 passing through the dots, indicating that the (x, y) is relatively darker, that is, ⁇ 1(x, y) a* ⁇ ( x, y) * f (x, y) (2).
  • the LED light source 100 further includes a PCB board 140.
  • the number of the blue LED lamp beads 120 is several.
  • the plurality of blue LED lamp beads 120 are arranged in an array and electrically connected to the PCB board 140.
  • the reflective sheet 200 corresponds to a plurality of blue LED lights.
  • a through hole 240 is defined in the position of the bead 120.
  • the reflective sheet 200 is disposed on the PCB board 140.
  • the blue LED lamp bead 120 is protruded from the through hole 240 to be disposed above the reflective sheet 200.
  • the PCB board 140 is used to drive the blue LED lamp bead 120.
  • the reflective sheet 200 is disposed on the PCB board 140 by providing a through hole 240 on the reflective sheet 200.
  • the blue LED lamp bead 120 is protruded from the through hole 240 to be disposed on the reflective sheet. Above the 200, part of the light emitted by the blue LED lamp bead directly enters the quantum dot film 300, and the other part is reflected by the reflection sheet 200 and enters the quantum dot film 300. By providing the through hole 240 on the reflection sheet 200, the blue LED lamp bead 120 is not affected. The position of the set can also prevent the blocking of the PCB board 140 to achieve a better reflection effect.
  • the blue LED direct-lit backlight module further includes a diffusion plate 400 disposed above the quantum dot film 300 and an optical film group 500 disposed above the diffusion plate 400.
  • the diffusion plate 400 By providing the diffusion plate 400, the light can be evenly distributed, and the underlying quantum dot film 300, the LED light source 100, and the reflection sheet 200 can be protected.
  • the optical film group 500 can refract light emitted from the diffusion plate 400 and improve the angular distribution of the light. Concentrate the light to the front view angle, increase the luminous flux of the front view angle, and improve the light utilization rate.
  • the reflective sheet 200 is an integral reflective sheet.
  • the blue LED direct-lit backlight module is a planar direct-type backlight module.
  • the reflective sheet 200 is of an integrated type, and has a simple structure.
  • the yellow mesh dots 220 are printed on the four sides of the reflective sheet 200 to achieve a corresponding effect.
  • the blue LED direct-lit backlight module is a curved direct-lit backlight module
  • the reflective sheet 200' is a split-type reflective sheet
  • the split-type reflective sheet 200' includes a main reflective sheet. 210 and an auxiliary reflection sheet 230 disposed around the main reflection sheet 210, and the yellow dot 220 is disposed on the auxiliary reflection sheet 230.
  • the reflective sheet 200' is set in a component type, which can well adapt to the curved surface of the blue LED direct-lit backlight module to achieve a better reflection effect.
  • the main reflection sheet 210 is disposed in a rectangular shape
  • the auxiliary reflection sheet 230 has four sheets, and the four auxiliary reflection sheets 230 are arranged in series with the four sides of the main reflection sheet 210.
  • the main reflection sheet 230 is disposed in a rectangular shape corresponding to the rectangular liquid crystal display panel, and the four auxiliary reflection sheets 230 are respectively disposed around the main reflection sheet 210.
  • the auxiliary reflection sheet 230 is installed first, and then the four sides are installed in the split assembly. In the middle of the final assembly, the main reflection sheet 210 is used to splicing and pressing the side of the auxiliary reflection sheet 230 close to the main reflection sheet 210 for positioning, thereby achieving a better fixing effect.
  • the present invention also provides a liquid crystal display panel, which includes a blue LED direct-lit backlight module.
  • a blue LED direct-lit backlight module refers to the above embodiment, and the liquid crystal display adopts all the above embodiments. All the technical solutions, therefore, also have all the beneficial effects brought about by the technical solutions of the above embodiments.
  • the liquid crystal display of Comparative Example 1 and the liquid crystal display of Example 1 were provided and tested to demonstrate the display effect of the liquid crystal display of the present invention.
  • Comparative Example 1 is a liquid crystal display with a light mixing distance of 15 mm without using a blue LED direct-lit backlight module, and the liquid crystal display of the contrast ratio 1 is illuminated, and the four sides of the liquid crystal display are obvious, if an optical brightness meter such as CA3000 is used (the measurement is performed) When the brightness unit is nit, the measurement will find that the brightness of the four sides is about 50 nit higher than the middle, and the four sides of the blue bright side can be clearly distinguished visually.
  • CA3000 optical brightness meter
  • Embodiment 1 is a liquid crystal display with a light mixing distance of 15 mm using a blue LED direct-type backlight module, and the liquid crystal display panel of Embodiment 1 is illuminated, and after using the blue LED direct-lit backlight module of the present invention, the four sides of the backlight are obtained. It is very good to improve. It is measured by optical brightness meter. The difference between the four sides and the middle is only about 10 nit. It is visually undetectable.
  • Example 1 Comparative example 1 Test instrument and / or standard Exterior Uniform brightness Blue bright frame around Visual inspection Central color and brightness White 420nit White 430nit CA3000 measurement Edge color and brightness White 400nit Blue 385nit CA3000 measurement
  • applying the blue LED direct-lit backlight module of the present invention to the liquid crystal display can significantly improve the phenomenon that the blue bright frame is generated at the edge due to the short mixing distance, and can be arranged through the dot. Location The settings get a better display.

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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)
  • Planar Illumination Modules (AREA)
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Abstract

一种蓝光LED直下式背光模组和液晶显示屏，其中，蓝光LED直下式背光模组包括LED光源（100）、反射片（200）及量子点薄膜（300），所述LED光源（100）包括蓝光LED灯珠（120），所述蓝光LED灯珠（120）设于所述反射片（200）上，所述量子点薄膜（300）设于蓝光LED灯珠（120）上方，所述反射片（200）的边缘位置设有黄色网点（220），所述黄色网点（220）用以散射所述蓝光LED灯珠（120）射到所述黄色网点（220）上的蓝光。改善了使用蓝光LED直下式背光模组的液晶显示屏由于混光距离较短而产生的边缘出现蓝色的亮框的现象。

Description

蓝光LED直下式背光模组和液晶显示屏 技术领域
本发明涉及液晶显示技术领域，特别涉及一种蓝光LED直下式背光模组和液晶显示屏。
背景技术
目前现有的液晶显示屏的背光模组按背光源的不同分为直下式背光模组和侧入式背光模组两大类。平面显示装置正在向轻薄化发展，随着显示装置厚度的降低，直下式背光模组的混光距离也相应变短，混光距离的变短会使混光的效果受到影响，最直观的表现就是，点亮使用混光距离较短的直下式背光模组的液晶显示屏后，液晶显示屏的边缘位置的亮度会明显较高，产生边缘亮框问题。
采用蓝光LED作为背光源可以有效提升本光模组的亮度，通过量子点薄膜将蓝光转化成白光，可以将显示颜色占NTSC色域的比例从75％提升到100％，给消费者带来更好的视觉效果，因此蓝光LED背光模组会逐渐成为行业趋势；但使用蓝色的LED作为光源的时候，混光距离较短的液晶显示屏的也会产生边缘亮框问题，而且边缘亮框呈蓝色，十分影响显示效果。
发明内容
本发明的主要目的是提供一种蓝光LED直下式背光模组，旨在改善使用蓝光LED直下式背光模组的液晶显示屏由于混光距离较短而产生的边缘出现蓝色的亮框的现象。
为实现上述目的，本发明提出的蓝光LED直下式背光模组，包括LED光源、反射片及量子点薄膜，所述LED光源包括蓝光LED灯珠，所述蓝光LED灯珠设于所述反射片上，所述量子点薄膜设于蓝光LED灯珠的上方，所述反射片的边缘位置设有黄色网点，所述黄色网点用以散射所述蓝光LED灯珠射到所述黄色网点上的蓝光；其中，
所述黄色网点的排布位置由Gtools lgp、Lighttools(lts)或者Mathcad光学设计软件根据反射片形成网点的开口率a计算得到，其中a由下述公式计算得到：
a＝S×Φ1(x，y)/D(x，y)b*L(x，y)，其中a的定义是单位面积内黄色网点面积除以整个反射片网点区域面积；S为(x，y)处一个网点的面积；D为(x，y)处设置黄色网点的网格面积；Φ1(x，y)为(x，y)处目标光通量；L(x，y)为无黄色网点时光源照射在(x，y)处的亮度；b为照度转换为光通量的转换系数；
所述LED光源还包括PCB板，所述蓝光LED灯珠的数量为数个，数个所述蓝光LED灯珠阵列排布并电性连接于所述PCB板，所述反射片对应数个所述蓝光LED灯珠的位置开设通孔，所述反射片设于所述PCB板上，所述蓝光LED灯珠由所述通孔伸出以设于所述反射片上方。
优选地，所述黄色网点由调配油墨通过丝印方式形成到所述反射片上，所述调配油墨由黄色油墨和白色油墨调配得到。
优选地，所述反射片为分体式反射片，所述分体式反射片包括主反射片及设于围绕主反射片设置的辅助反射片，所述黄色网点设于所述辅助反射片上。
优选地，所述主反射片呈矩形设置，所述辅助反射片有四片，四片所述辅助反射片分别与所述主反射片的四条边拼接设置。
本发明还提出一种蓝光LED直下式背光模组，包括LED光源、反射片及量子点薄膜，所述LED光源包括蓝光LED灯珠，所述蓝光LED灯珠设于所述反射片上，所述量子点薄膜设于蓝光LED灯珠的上方，所述反射片的边缘位置设有黄色网点，所述黄色网点用以散射所述蓝光LED灯珠射到所述黄色网点上的蓝光。
优选地，所述黄色网点由调配油墨通过丝印方式形成到所述反射片上，所述调配油墨由黄色油墨和白色油墨调配得到。
优选地，所述黄色网点的排布位置由Gtools lgp、Lighttools(lts)或者Mathcad光学设计软件根据反射片形成网点的开口率a计算得到，其中a由下述公式计算得到：
a＝S×Φ1(x，y)/D(x，y)b*L(x，y)，其中a的定义是单位面积内黄色网点面积除以整个反射片网点区域面积；S为(x，y)处一个网点的面积；D为(x，y)处设置黄色网点的网格面积；Φ1(x，y)为(x，y)处目标光通量；L(x，y)为无黄色网点时光源照射在(x，y)处的亮度；b为照度转换为光通量的转换系数。
优选地，所述LED光源还包括PCB板，所述蓝光LED灯珠的数量为数个，数个所述蓝光LED灯珠阵列排布并电性连接于所述PCB板，所述反射片对应数个所述蓝光LED灯珠的位置开设通孔，所述反射片设于所述PCB板上，所述蓝光LED灯珠由所述通孔伸出以设于所述反射片上方。
优选地，所述的蓝光LED直下式背光模组还包括设于所述量子点薄膜上方的扩散板和设于扩散板上方的光学膜片组。
优选地，所述反射片为一体式反射片。
优选地，所述反射片为分体式反射片，所述分体式反射片包括主反射片及设于围绕主反射片设置的辅助反射片，所述黄色网点设于所述辅助反射片上。
优选地，所述主反射片呈矩形设置，所述辅助反射片有四片，四片所述辅助反射片分 别与所述主反射片的四条边拼接设置。
本发明还提出一种液晶显示屏，包括蓝光LED直下式背光模组，所述蓝色LED直下式背光模组包括LED光源、反射片及量子点薄膜，所述LED光源包括蓝光LED灯珠，所述蓝光LED灯珠设所述反射片上，所述量子点薄膜设于蓝光LED灯珠上方，所述反射片的边缘位置设有黄色网点。
本发明技术方案在反射片的边缘位置设置黄色网点，根据光源互补原理，蓝色的光经过黄色网点反射后呈白色，同时黄色网点还可以将部分光线吸收和散射，降低反射光的亮度，因此可以有效改善使用蓝光LED直下式背光模组的液晶显示屏由于混光距离较短而产生的边缘出现蓝色的亮框的现象，从而提高光学品味，改善显示效果。
附图说明
图1为本发明蓝光LED直下式背光模组一实施例的结构示意图；
图2为图1中蓝光LED直下式背光模组的反射片结构示意图；
图3为本发明蓝光LED直下式背光模组另一实施例的反射片的结构示意图。
附图标号说明：
标号 名称 标号 名称
100 LED光源 200或200’ 反射片
300 量子点薄膜 400 扩散板
500 光学膜片组 120 蓝光LED灯珠
140 PCB板 220 黄色网点
240 通孔 210 主反射片
230 辅助反射片    
本发明目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
下面结合附图及具体实施例就本发明的技术方案做进一步的说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
本发明提出一种蓝光LED直下式背光模组，改善使用蓝光LED直下式背光模组的液晶显示屏由于混光距离较短而产生的边缘出现蓝色的亮框的现象。
请参阅图1和图2，以LED光源100指向量子点薄膜300的方向为上方，此时提到 的上方、下方均是相对位置，在实际应用中，LED光源100与量子点薄膜300可能为前后设置。在本发明实施例中，该蓝光LED直下式背光模组，包括LED光源100、反射片200及量子点薄膜300，LED光源100包括蓝光LED灯珠120，蓝光LED灯珠120设反射片200上，量子点薄膜300设于蓝光LED灯珠120上方，反射片200的边缘位置设有黄色网点220，所述黄色网点220用以散射所述蓝光LED灯珠120射到所述黄色网点220上的蓝光。
如果不设置黄色网点220，蓝光LED直下式背光模组容易出现边缘蓝色亮框的情况，且在小混光距离(混光距离小于等于18mm)的背光模组中，边缘亮框现象最为显著，会严重影响光学品味；因此在本发明中针对蓝色的边缘亮框，在反射片200的边缘位置使用油墨丝印黄色网点220，根据光源互补原理，蓝色的光经过黄色网点220反射后呈白色，同时黄色网点220还可以将部分光线吸收和散射，降低反射光的亮度，因此可以有效改善使用蓝光LED直下式背光模组的液晶显示屏由于混光距离较短而产生的边缘出现蓝色的亮框的现象。
优选地，黄色网点220由调配油墨通过丝印方式形成到反射片200上，调配油墨由黄色油墨和白色油墨调配得到。黄色网点220通过丝印到反射片200上，操作简单，调配油墨由黄色油墨和白色油墨调配得到，其中黄色油墨是指印刷三原色的黄色油墨，通过黄色油墨和白色油墨和调配，得到黄色深浅合适的调配油墨，印刷得到相应的黄色网点220。
黄色网点220的排布位置会影响改善效果，优选地，黄色网点220的排布位置由Gtools lgp、Lighttools(lts)或者Mathcad光学设计软件根据反射片形成网点的开口率a计算得到，其中a由下述公式计算得到：
a＝S×Φ(x，y)/D(x，y)b*L(x，y)，其中a的定义是单位面积内黄色网点220面积除以整个反射片网点区域面积；S为(x，y)处一个网点的面积；D为(x，y)处设置黄色网点220的网格面积；Φ(x，y)为(x，y)处无黄色网点220时的光通量；L(x，y)为无黄色网点220时光源照射在(x，y)处的亮度；b为照度转换为光通量的转换系数。
该公式的原理如下：
定义反射片200上的网点填充密度函数x，y为：f(x，y)＝D(x，y)/S(1)，其中S为(x，y)处一个网点的面积，D(x，y)为(x，y)处设置的黄色网点220的网格面积。
设(x，y)处无黄色网点220之前的光通量为Φ(x，y)，(x，y)处形成黄色网点220后的光通量为Φ1(x，y)，Φ1(x，y)即为目标光通量，定义a为反射片形成网点的开口率，该开口率是一个小于等于1的小数，其值数学定义是由单位面积内网点面积除以整个反射片网点区域面积。
当LED光源100一定、反射片200尺寸一定时，Φ1(x，y)应该反比于(x，y)处反射片200网点的填充密度函数f(x，y)，即f(x，y)越大，表示(x，y)处对应的网点越多，那么透过网点的光通量Φ1越少，表示(x，y)处相对越暗，即有Φ1(x,y)＝a*Φ(x,y)*f(x,y)(2)。
同理，Φ(x，y)与无黄色网点时光源照射在(x，y)处的亮度L(x，y)成正比关系，即Φ(x,y)＝L(x,y)*Ω*m2，其中Ω表示某一特定方向的单位立体角，m2表示单位面积，在此定义b＝Ω*m2，b即为照度转换成光通量的转换系数，其是一个大小一定的向量，该向量的方向可以根据需要进行选取，则Φ(x,y)＝b*L(x,y)(3)，其中光通量Φ可以通过积分球测得。
由公式(2)(3)得出：Φ1(x，y)＝a*b*L(x，y)*f(x，y)    (4)；
从而由公式(1)(4)得出：a＝S×Φ1(x，y)/D(x，y)b*L(x，y)    (5)
再将a值输入GTOOLS、LIGHTTOOLS(LTS)或者Mathcad等光学设计软件，运行后即可得到所需的反射片网点的排布位置。
优选地，LED光源100还包括PCB板140，蓝光LED灯珠120的数量为数个，数个蓝光LED灯珠120阵列排布并电性连接于PCB板140，反射片200对应数个蓝光LED灯珠120的位置开设通孔240，反射片200设于PCB板140上，蓝光LED灯珠120由通孔240伸出以设于反射片200上方。PCB板140用于驱动蓝光LED灯珠120，通过在反射片200上设置通孔240，将反射片200设于PCB板140上，蓝光LED灯珠120由通孔240伸出以设于反射片200上方，蓝光LED灯珠发出的光一部分直接进入量子点薄膜300，另一部分经过反射片200反射后进入量子点薄膜300，通过在反射片200上设置通孔240，不影响蓝光LED灯珠120的设置位置，同时还能够防止PCB板140的阻挡，达到更好的反射效果。
优选地，蓝光LED直下式背光模组还包括设于量子点薄膜300上方的扩散板400和设于扩散板400上方的光学膜片组500。通过设置扩散板400，可以让光均匀分布，还可以保护下方的量子点薄膜300、LED光源100和反射片200，光学膜片组500能够折射从扩散板400射出的光线，改善光线的角分布，将光线集中到正视角度上，提高正视角度的出光光通量，提高光线利用率。
优选地，反射片200为一体式反射片。在本实施例中，蓝光LED直下式背光模组为平面直下式背光模组，该反射片200采用一体式，其结构简单，在该反射片200四边丝印黄色网点220即可达到相应效果。
请参阅图3，在本发明的另一实施例中，蓝光LED直下式背光模组为曲面直下式背光模组，反射片200’为分体式反射片，分体式反射片200’包括主反射片210及设于围绕主反射片210设置的辅助反射片230，黄色网点220设于辅助反射片230上。将反射片200’设置成分体式，能够很好的适应蓝光LED直下式背光模组的曲面，达到更好的反射效果。
优选地，主反射片210呈矩形设置，辅助反射片230有四片，四片辅助反射片230与主反射片210的四条边拼接设置。主反射片230对应矩形的液晶显示屏设置设置为矩形，四片辅助反射片230分别设置在主反射片210的四周，安装时，先安装辅助反射片230再安装分体式装配时先装四边，最后装中间，利用主反射片210拼接并压住辅助反射片230靠近主反射片210的侧边来进行定位，达到更好的固定效果。
本发明还提出一种液晶显示屏，该液晶显示屏包括蓝光LED直下式背光模组，该蓝光LED直下式背光模组的具体结构参照上述实施例，由于本液晶显示屏采用了上述所有实施例的全部技术方案，因此同样具有上述实施例的技术方案所带来的所有有益效果。
兹提供对比例1的液晶显示屏和实施例1的液晶显示屏并进行测试以说明本发明液晶显示屏的显示效果。
对比例1为未使用蓝光LED直下式背光模组的混光距离为15mm的液晶显示屏，点亮对比例1的液晶显示屏，其四边亮边明显，若使用CA3000等光学亮度计(其测出亮度单位为nit)测量会发现，四边亮度比中间高出约50nit左右，视觉上能很明显分辨出四边蓝亮边。
实施例1为使用蓝光LED直下式背光模组的混光距离为15mm的液晶显示屏，点亮实施例1的液晶显示屏，使用本发明的蓝光LED直下式背光模组后，四边亮边得到很好改善，使用光学亮度计测量，四边和中间只相差10nit左右，视觉上已经察觉不出其差异。
具体测试方法和测试结果如表1所示。
表1
  实施例1 对比例1 测试仪器和/或标准
外观 亮度均匀 四周有蓝色亮框 目测
中部颜色及亮度 白色420nit 白色430nit CA3000测量
边缘颜色及亮度 白色400nit 蓝色385nit CA3000测量
由此可见，将本发明的蓝光LED直下式背光模组应用到液晶显示屏中，能够明显改善由于混光距离较短而产生的边缘出现蓝色的亮框的现象，并且可以通过网点排布位置的 设置得到较好的显示效果。
应当说明的是，在本发明的描述中，术语“上”、“下”、““左”、“右”、“竖直”、“水平”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，并不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。本发明的各个实施例的技术方案可以相互结合，但是必须是以本领域的技术人员能够实现为基础，当技术方案的结合出现相互矛盾或无法实现时应当人认为这种技术方案的结合不存在，也不在本发明要求的保护范围之内。
以上所述仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (20)

  1. 一种蓝光LED直下式背光模组，其特征在于，包括LED光源、反射片及量子点薄膜，所述LED光源包括蓝光LED灯珠，所述蓝光LED灯珠设于所述反射片上，所述量子点薄膜设于蓝光LED灯珠的上方，所述反射片的边缘位置设有黄色网点，所述黄色网点用以散射所述蓝光LED灯珠射到所述黄色网点上的蓝光；其中，
    所述黄色网点的排布位置由Gtools lgp、Lighttools(lts)或者Mathcad光学设计软件根据反射片形成网点的开口率a计算得到，其中a由下述公式计算得到：
    a＝S×Φ1(x，y)/D(x，y)b*L(x，y)，其中a的定义是单位面积内黄色网点面积除以整个反射片网点区域面积；S为(x，y)处一个网点的面积；D为(x，y)处设置黄色网点的网格面积；Φ1(x，y)为(x，y)处目标光通量；L(x，y)为无黄色网点时光源照射在(x，y)处的亮度；b为照度转换为光通量的转换系数；
    所述LED光源还包括PCB板，所述蓝光LED灯珠的数量为数个，数个所述蓝光LED灯珠阵列排布并电性连接于所述PCB板，所述反射片对应数个所述蓝光LED灯珠的位置开设通孔，所述反射片设于所述PCB板上，所述蓝光LED灯珠由所述通孔伸出以设于所述反射片上方。
  2. 如权利要求1所述的蓝光LED直下式背光模组，其特征在于，所述黄色网点由调配油墨通过丝印方式形成到所述反射片上，所述调配油墨由黄色油墨和白色油墨调配得到。
  3. 如权利要求1所述的蓝光LED直下式背光模组，其特征在于，所述反射片为分体式反射片，所述分体式反射片包括主反射片及设于围绕主反射片设置的辅助反射片，所述黄色网点设于所述辅助反射片上。
  4. 如权利要求3所述的蓝光LED直下式背光模组，其特征在于，所述主反射片呈矩形设置，所述辅助反射片有四片，四片所述辅助反射片分别与所述主反射片的四条边拼接设置。
  5. 一种蓝光LED直下式背光模组，其特征在于，包括LED光源、反射片及量子点薄膜，所述LED光源包括蓝光LED灯珠，所述蓝光LED灯珠设于所述反射片上，所述量子点薄膜设于蓝光LED灯珠的上方，所述反射片的边缘位置设有黄色网点，所述黄色网点用以散射所述蓝光LED灯珠射到所述黄色网点上的蓝光。
  6. 如权利要求5所述的蓝光LED直下式背光模组，其特征在于，所述黄色网点由调配油墨通过丝印方式形成到所述反射片上，所述调配油墨由黄色油墨和白色油墨调配得到。
  7. 如权利要求5所述的蓝光LED直下式背光模组，其特征在于，所述黄色网点的排布位置由Gtools lgp、Lighttools(lts)或者Mathcad光学设计软件根据反射片形成网点的开口率a计算得到，其中a由下述公式计算得到：
    a＝S×Φ1(x，y)/D(x，y)b*L(x，y)，其中a的定义是单位面积内黄色网点面积除以整个反射片网点区域面积；S为(x，y)处一个网点的面积；D为(x，y)处设置黄色网点的网格面积；Φ1(x，y)为(x，y)处目标光通量；L(x，y)为无黄色网点时光源照射在(x，y)处的亮度；b为照度转换为光通量的转换系数。
  8. 如权利要求5所述的蓝光LED直下式背光模组，其特征在于，所述LED光源还包括PCB板，所述蓝光LED灯珠的数量为数个，数个所述蓝光LED灯珠阵列排布并电性连接于所述PCB板，所述反射片对应数个所述蓝光LED灯珠的位置开设通孔，所述反射片设于所述PCB板上，所述蓝光LED灯珠由所述通孔伸出以设于所述反射片上方。
  9. 如权利要求5所述的蓝光LED直下式背光模组，其特征在于，还包括设于所述量子点薄膜上方的扩散板和设于扩散板上方的光学膜片组。
  10. 如权利要求5所述的蓝光LED直下式背光模组，其特征在于，所述反射片为一体式反射片。
  11. 如权利要求5所述的蓝光LED直下式背光模组，其特征在于，所述反射片为分体式反射片，所述分体式反射片包括主反射片及设于围绕主反射片设置的辅助反射片，所述黄色网点设于所述辅助反射片上。
  12. 如权利要求11所述的蓝光LED直下式背光模组，其特征在于，所述主反射片呈矩形设置，所述辅助反射片有四片，四片所述辅助反射片分别与所述主反射片的四条边拼接设置。
  13. 一种液晶显示屏，其特征在于，包括蓝光LED直下式背光模组，所述蓝光LED 直下式背光模组包括LED光源、反射片及量子点薄膜，所述LED光源包括蓝光LED灯珠，所述蓝光LED灯珠设于所述反射片上，所述量子点薄膜设于蓝光LED灯珠的上方，所述反射片的边缘位置设有黄色网点，所述黄色网点用以散射所述蓝光LED灯珠射到所述黄色网点上的蓝光。
  14. 如权利要求13所述的液晶显示屏，其特征在于，所述黄色网点由调配油墨通过丝印方式形成到所述反射片上，所述调配油墨由黄色油墨和白色油墨调配得到。
  15. 如权利要求13所述的液晶显示屏，其特征在于，所述黄色网点的排布位置由Gtoolslgp、Lighttools(lts)或者Mathcad光学设计软件根据反射片形成网点的开口率a计算得到，其中a由下述公式计算得到：
    a＝S×Φ1(x，y)/D(x，y)b*L(x，y)，其中a的定义是单位面积内黄色网点面积除以整个反射片网点区域面积；S为(x，y)处一个网点的面积；D为(x，y)处设置黄色网点的网格面积；Φ1(x，y)为(x，y)处目标光通量；L(x，y)为无黄色网点时光源照射在(x，y)处的亮度；b为照度转换为光通量的转换系数。
  16. 如权利要求13所述的液晶显示屏，其特征在于，所述LED光源还包括PCB板，所述蓝光LED灯珠的数量为数个，数个所述蓝光LED灯珠阵列排布并电性连接于所述PCB板，所述反射片对应数个所述蓝光LED灯珠的位置开设通孔，所述反射片设于所述PCB板上，所述蓝光LED灯珠由所述通孔伸出以设于所述反射片上方。
  17. 如权利要求13所述的液晶显示屏，其特征在于，还包括设于所述量子点薄膜上方的扩散板和设于扩散板上方的光学膜片组。
  18. 如权利要求13所述的液晶显示屏，其特征在于，所述反射片为一体式反射片。
  19. 如权利要求13所述的液晶显示屏，其特征在于，所述反射片为分体式反射片，所述分体式反射片包括主反射片及设于围绕主反射片设置的辅助反射片，所述黄色网点设于所述辅助反射片上。
  20. 如权利要求19所述的液晶显示屏，其特征在于，所述主反射片呈矩形设置，所述辅助反射片有四片，四片所述辅助反射片分别与所述主反射片的四条边拼接设置。
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