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WO2017206366A1 - Module de rétroéclairage et dispositif d'affichage - Google Patents

Module de rétroéclairage et dispositif d'affichage Download PDF

Info

Publication number
WO2017206366A1
WO2017206366A1 PCT/CN2016/095373 CN2016095373W WO2017206366A1 WO 2017206366 A1 WO2017206366 A1 WO 2017206366A1 CN 2016095373 W CN2016095373 W CN 2016095373W WO 2017206366 A1 WO2017206366 A1 WO 2017206366A1
Authority
WO
WIPO (PCT)
Prior art keywords
reflective
backlight
display device
ink layer
backlight module
Prior art date
Application number
PCT/CN2016/095373
Other languages
English (en)
Chinese (zh)
Inventor
尤君平
李圣
陆振华
李海鹰
孙小军
Original Assignee
深圳创维－Rgb电子有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳创维－Rgb电子有限公司 filed Critical 深圳创维－Rgb电子有限公司
Publication of WO2017206366A1 publication Critical patent/WO2017206366A1/fr

Links

Classifications

    • 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
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0274—Optical details, e.g. printed circuits comprising integral optical means

Definitions

  • the present invention relates to the field of display device technologies, and in particular, to a backlight module and a display device.
  • the backlight In today's display devices (such as liquid crystal display devices, liquid crystal televisions, etc.), there is usually a matching difference between the backlight and the optical component, for example, in a direct-lit type liquid crystal display device using a backlight as an LED, in order to make a reflective sheet It can be easily and firmly adhered to the PCB board and the LED fixed on the PCB board.
  • the reflective sheet usually has a through hole for the LED to be exposed and larger than the LED. In this case, the LED is in the through hole.
  • the PCB board not covered with the reflective sheet is exposed around, and the PCB board has a low reflection effect on the light, so that the backlight can not be fully utilized on the one hand, and the brightness around the backlight is low on the other hand, thereby The uniformity of the backlight brightness of the display device is reduced, both of which reduce the display quality of the display device.
  • the main object of the present invention is to provide a backlight module, which aims to improve the utilization ratio of the backlight and the uniformity of the backlight brightness of the display device, thereby improving the display quality of the display device.
  • a backlight module provided by the present invention includes a PCB board with a backlight and a reflective sheet attached to the inner surface of the PCB.
  • the reflective sheet is provided with the backlight.
  • the PCB board is provided with a reflective layer for reflecting light in a gap region between the outer edge of the backlight and the edge of the through hole.
  • the reflective layer is a reflective ink layer.
  • the reflective ink layer is white or silver white.
  • the material of the reflective ink layer comprises glass particles.
  • the glass particles have a particle size on the order of nanometers.
  • the reflective ink layer is formed onto the PCB by silk screen printing.
  • the reflective ink layer has a thickness of 10 um to 40 um.
  • the reflective ink layer has a thickness of 25 um to 40 um.
  • the reflective layer is a reflective film attached to the PCB board.
  • the backlight module further includes a diffusion plate disposed above the reflective sheet for uniformly distributing light, and an optical film assembly stacked on the diffusion plate for improving light distribution.
  • the optical film assembly includes a lower diffusion sheet, an upper diffusion sheet, and a prism sheet which are laminated in this order from the bottom to the top.
  • the present invention also provides a display device including a backlight module, the backlight module includes a PCB board with a backlight and a reflective sheet attached to the inner surface of the PCB, and the reflective sheet is provided with a supply A through hole through which the backlight is disposed, the PCB board is provided with a reflective layer for reflecting light in a gap region between the outer edge of the backlight and the edge of the through hole.
  • the backlight module includes a PCB board with a backlight and a reflective sheet attached to the inner surface of the PCB, and the reflective sheet is provided with a supply A through hole through which the backlight is disposed, the PCB board is provided with a reflective layer for reflecting light in a gap region between the outer edge of the backlight and the edge of the through hole.
  • the reflective layer is a reflective ink layer.
  • the reflective ink layer is white or silver white.
  • the material of the reflective ink layer comprises glass particles.
  • the glass particles have a particle size on the order of nanometers.
  • the reflective ink layer is formed onto the PCB by silk screen printing.
  • the reflective ink layer has a thickness of 10 um to 40 um.
  • the reflective ink layer has a thickness of 25 um to 40 um.
  • the reflective layer is a reflective film attached to the PCB board.
  • the backlight module further includes a diffusion plate disposed above the reflective sheet for uniformly distributing light, and an optical film assembly stacked on the diffusion plate for improving light distribution.
  • the optical film assembly includes a lower diffusion sheet, an upper diffusion sheet, and a prism sheet which are laminated in this order from the bottom to the top.
  • a reflective layer is disposed on a PCB board at a gap region between the outer edge of the backlight and the edge of the via hole, and the reflective layer has a reflective characteristic for the light, so compared with the current common cause
  • the difference between the backlight and the reflective sheet leads to the bare exposure of the PCB in the gap region. Since the reflectivity of the reflective layer to the backlight is much higher than that of the PCB, the backlight can be emitted on the one hand. The light can be more reflected by the reflective layer, thereby improving the utilization of the backlight; on the other hand, the reflection of the light through the reflective layer can make the area of the original backlight having a lower brightness, that is, bare the PCB board.
  • the brightness of the gap region is increased, thereby avoiding the backlight or bright or dark situation of the display device, thereby improving the uniformity of the backlight brightness of the display device, and the two aspects can improve the picture display quality of the display device.
  • FIG. 1 is a cross-sectional structural view showing an embodiment of a backlight module of the present invention
  • FIG. 2 is a top plan view of the PCB board of FIG. 1;
  • Figure 3 is an enlarged schematic view of a portion A in Figure 1;
  • Figure 4 is an enlarged schematic view of the portion B in Figure 1.
  • Label name Label name 1 PCB board 2 Backlight twenty one LED light twenty two lens 3 A reflective sheet 4 Reflective ink layer 5 Diffuser 6 Optical diaphragm assembly 61 Lower diffuser 62 Upper diffuser 63 Prism sheet
  • the directional indication is only used to explain in a certain posture (as shown in the drawing)
  • the relative positional relationship between the components, the motion situation, and the like if the specific posture changes, the directional indication also changes accordingly.
  • first”, “second”, etc. in the embodiments of the present invention, the description of the "first”, “second”, etc. is used for the purpose of description only, and is not to be construed as an Its relative importance or implicit indication of the number of technical features indicated.
  • features defining “first” or “second” may include at least one of the features, either explicitly or implicitly.
  • the technical solutions between the various embodiments may be combined with each other, but must be based on the realization of those skilled in the art, and when the combination of the technical solutions is contradictory or impossible to implement, it should be considered that the combination of the technical solutions does not exist. It is also within the scope of protection required by the present invention.
  • the invention provides a backlight module for a display device.
  • the backlight module includes a PCB board 1 with a backlight 2 and a reflective sheet 3 attached to the inner surface of the PCB board 1.
  • the display device having the backlight module is a direct type liquid crystal television (not shown).
  • the reflective sheet 3 is provided with a through hole through which the backlight 2 is disposed
  • the PCB board 1 is provided with a reflective layer for reflecting light in a gap region between the outer edge of the backlight 2 and the edge of the through hole.
  • the reflective layer is the reflective ink layer 4.
  • the reflective ink layer 4 is disposed on the PCB board 1 in the gap region between the outer edge of the backlight 2 and the edge of the via hole, and the reflective ink layer 4 mainly has a reflective characteristic for the light, so
  • the PCB board 1 is directly exposed in the gap region.
  • the reflective ink layer 4 is emitted from the backlight 2 The reflectivity of the light is much higher than that of the PCB 1.
  • the light emitted by the backlight 2 can be more reflected by the reflective ink layer 4, thereby improving the utilization of the backlight 2;
  • the reflection of the light by the reflective ink layer 4 can improve the brightness of the area where the brightness of the original backlight 2 is low, that is, the gap area where the PCB board 1 is exposed, thereby avoiding the backlight or the bright or dark situation of the display device.
  • the uniformity of the backlight brightness of the display device is improved, and the combination of the two aspects can improve the picture display quality of the display device.
  • the reflective layer may also be designed as other reflective structures, such as, but not limited to, the reflective layer being a reflective film attached to the PCB 1.
  • the reflective ink layer 4 used in the present embodiment has a cost advantage, and because the reflective ink layer 4 can be attached to the PCB 1 by a simple screen printing process, it also has a process manufacturing. Convenience.
  • the backlight 2 preferably includes an LED lamp 21 and a lens 22 disposed on the LED lamp 21 for converting a point source into a surface light source.
  • the lens 22 is formed through the through hole to reveal the reflection.
  • Slice 3 It can be understood that, correspondingly, the gap area between the outer edge of the lens 22 and the edge of the through hole on the PCB board 1 should be the position where the reflective ink layer 4 is disposed.
  • the PCB board 1 is a package carrier of the backlight 2, and the plurality of backlights 2 are fixedly mounted on the PCB board 1 and the plurality of backlights 2 are on the PCB board 1
  • the arrays are arranged in an array at intervals to form a backlight 2 light source matrix, which is the arrangement of the backlight 2 in a conventional direct type liquid crystal television.
  • the reflective ink layer 4 is preferably white or silver white.
  • the color of the reflective film may also be preferably white or silver white, because the LED lamp 21 generally used for display devices emits three primary colors.
  • the mixed white light having a wavelength of 450 nm to 600 nm is mixed, and the white or silver white reflective layer has a high reflectance for the white light.
  • the present invention is not limited thereto, and the color of the reflective ink layer 4 can be adjusted according to actual requirements, which is not limited by the present invention.
  • the material of the reflective ink layer 4 includes nanometers in addition to color materials, binders, and auxiliary agents. Grade of glass particles. It can be understood that, by virtue of the principle of lens refraction and concave spherical reflection, the glass particles can produce a high reflectance glare when the reflective ink layer 4 is irradiated by the backlight 2, which is much higher than the current common white. The reflectivity of the ink without glare.
  • the materials of the reflective ink layer 4 are preferably nano-scale, and the nano-scale composition of the reflective ink layer 4 can increase the heat radiation coefficient and heat conduction efficiency of the ink, so that the temperature of the PCB board 1 is lowered.
  • the effect of the backlight 2 can be indirectly improved.
  • the thickness of the reflective ink layer 4 is proportional to its reflectance. For example, when the thickness of the reflective ink layer 4 is 10 um to 40 um, the reflectance of the mixed white light emitted from the backlight 2 is 65 to 92%. The reflectance is greater than the reflectivity of the conventional PCB board 1 to the mixed white light.
  • the thickness of the reflective ink layer 4 is preferably 25 um to 40 um.
  • the reflectance of the mixed white light emitted from the backlight 2 can reach 85 to 92%, and the reflectance is substantially the same as or slightly lower than the reflectance of the conventional reflection sheet 3.
  • the reflectivity of the sheet 3 is much higher than the reflectivity of the PCB board 1, so that the light emitted by the backlight 2 can be more reflected by the reflective ink layer 4, thereby improving the utilization ratio of the backlight 2 and the backlight. Uniformity of brightness.
  • the reflective ink layer 4 by comprehensively adjusting the thickness, color, and pattern shape of the reflective ink layer 4, it is also possible to control the intensity of the reflected light amount and control the reflective ink layer 4 to reflect light of different wavelengths, thereby adjusting the overall light color distribution of the backlight module. And light intensity.
  • the reflective ink layer 4 is preferably formed on the PCB 1 by silk screen printing.
  • the thickness of the reflective ink layer 4 can be controlled by the number of screen printing and the number of printing times.
  • the reflective ink layer 4 can also be coated on the PCB 1.
  • this method is not as good as the screen printing method for the thickness of the reflective ink layer 4, and the silk screen printing is a mature process, which is advantageous for mass production of the product.
  • the backlight module further includes a diffusion plate 5 disposed above the reflection sheet 3 for uniformly distributing light, and laminated on the diffusion.
  • the optical film assembly 6 includes a lower diffusion sheet 61, an upper diffusion sheet 62, and a prism sheet 63 which are laminated in this order from the bottom to the top. It can be understood that, in the technical solution of the present invention, the reflective sheet 3 and the reflective ink layer 4 together form a reflecting surface, and the region between the diffusing plate 5 and the reflecting surface is a light mixing region.
  • the light color distribution of the light mixing region is obtained by mixing the light color of the LED lamp 21 of the lens 22, the reflective ink layer 4, and the light color reflected or absorbed by the reflection sheet 3, and can be adjusted according to actual needs.
  • light is refracted or reflected outwardly via the lens 22 via the LED lamp 21, and is reflected by the reflective ink layer 4 and the reflective sheet 3 at the bottom, and then uniform light is obtained via the diffuser 5 and the optical patch assembly 6.
  • Type distribution in the design of the present invention, in addition to adjusting the backlight wavelength by using the backlight module, it can also be used in combination with a filter (not shown) of the liquid crystal panel to perform overall correction on the backlight wavelength. The color gamut can be improved, and the overall display effect of the LCD TV is better.
  • the present invention also provides a display device, which includes a backlight module.
  • the specific structure of the backlight module refers to the above embodiment. Since the display device adopts all the technical solutions of all the above embodiments, at least the above embodiment is provided. All the beneficial effects brought about by the technical solutions are not repeated here.

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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)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Abstract

L'invention concerne un module de rétroéclairage et un dispositif d'affichage, le module de rétroéclairage comprenant une carte de circuit imprimé (1) ayant une source de rétroéclairage (2) disposée de manière fixe, et une feuille réfléchissante (3) fixée sur la surface interne de la carte de circuit imprimé (1), la feuille réfléchissante (3) étant pourvue d'un trou traversant destiné à être pénétré par de la source de rétroéclairage (2). La carte de circuit imprimé (1) est fournie, au niveau d'une région d'espacement entre un bord externe de la source de rétroéclairage (2) et un bord de trou du trou traversant, et comporte une couche réfléchissante (4) permettant de réfléchir les rayons lumineux. Par conséquent, le taux d'utilisation de la source de rétroéclairage (2) et la régularité de la luminosité du rétroéclairage du dispositif d'affichage peuvent être améliorés, rehaussant ainsi la qualité d'affichage du dispositif d'affichage.
PCT/CN2016/095373 2016-06-03 2016-08-15 Module de rétroéclairage et dispositif d'affichage WO2017206366A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610394199.X 2016-06-03
CN201610394199.XA CN105938273B (zh) 2016-06-03 2016-06-03 背光模组和显示设备

Publications (1)

Publication Number Publication Date
WO2017206366A1 true WO2017206366A1 (fr) 2017-12-07

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CN (1) CN105938273B (fr)
WO (1) WO2017206366A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109511217A (zh) * 2019-01-07 2019-03-22 深圳市顺荣昌电路有限公司 一种高反射率节能双面背光源线路板
CN110632790A (zh) * 2019-08-26 2019-12-31 武汉华星光电技术有限公司 一种背光模组、其制备方法及其显示装置
CN111812890A (zh) * 2020-08-06 2020-10-23 惠州视维新技术有限公司 发光结构、背光模组、显示装置
CN111948854A (zh) * 2020-08-21 2020-11-17 安徽芯瑞达科技股份有限公司 一种基于芯片级发光面的超薄直下式背光模组
CN113189814A (zh) * 2020-01-14 2021-07-30 海信视像科技股份有限公司 一种显示装置

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CN108761909A (zh) * 2018-05-28 2018-11-06 武汉华星光电技术有限公司 一种led面光源及其制备方法、显示面板
CN109307954B (zh) * 2018-10-31 2024-04-09 武汉华星光电技术有限公司 背光模块及液晶显示器
CN110161753A (zh) * 2019-05-31 2019-08-23 厦门天马微电子有限公司 一种背光模组及显示装置
CN113296309A (zh) * 2020-02-24 2021-08-24 海信视像科技股份有限公司 一种显示装置
CN111734982A (zh) * 2020-07-06 2020-10-02 安徽芯瑞达科技股份有限公司 一种超高反油墨直下式光学模组

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CN102080809B (zh) * 2009-11-30 2012-09-26 比亚迪股份有限公司 一种光学塑胶片材及其制作方法
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US20070153515A1 (en) * 2005-12-29 2007-07-05 Lg. Philips Lcd Co., Ltd. Backlight assembly and liquid crystal display module using the same
CN101303479A (zh) * 2007-05-10 2008-11-12 奇美电子股份有限公司 背光模块与液晶显示器
JP2010210891A (ja) * 2009-03-10 2010-09-24 Hitachi Displays Ltd 液晶表示装置
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109511217A (zh) * 2019-01-07 2019-03-22 深圳市顺荣昌电路有限公司 一种高反射率节能双面背光源线路板
CN110632790A (zh) * 2019-08-26 2019-12-31 武汉华星光电技术有限公司 一种背光模组、其制备方法及其显示装置
CN113189814A (zh) * 2020-01-14 2021-07-30 海信视像科技股份有限公司 一种显示装置
CN111812890A (zh) * 2020-08-06 2020-10-23 惠州视维新技术有限公司 发光结构、背光模组、显示装置
CN111948854A (zh) * 2020-08-21 2020-11-17 安徽芯瑞达科技股份有限公司 一种基于芯片级发光面的超薄直下式背光模组

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CN105938273B (zh) 2017-12-29

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