WO2014180102A1 - Reflector plate, downright backlight module and display device - Google Patents

Reflector plate, downright backlight module and display device Download PDF

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Publication number
WO2014180102A1
WO2014180102A1 PCT/CN2013/086744 CN2013086744W WO2014180102A1 WO 2014180102 A1 WO2014180102 A1 WO 2014180102A1 CN 2013086744 W CN2013086744 W CN 2013086744W WO 2014180102 A1 WO2014180102 A1 WO 2014180102A1
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WO
WIPO (PCT)
Prior art keywords
reflective sheet
backlight module
light
protrusion
reflector plate
Prior art date
Application number
PCT/CN2013/086744
Other languages
French (fr)
Chinese (zh)
Inventor
韦飞
Original Assignee
京东方科技集团股份有限公司
合肥京东方显示光源有限公司
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Application filed by 京东方科技集团股份有限公司, 合肥京东方显示光源有限公司 filed Critical 京东方科技集团股份有限公司
Publication of WO2014180102A1 publication Critical patent/WO2014180102A1/en

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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
    • G02F1/133604—Direct backlight with lamps
    • 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

Definitions

  • Embodiments of the present invention relate to the field of backlight technologies for displays, and in particular, to a reflective sheet, a direct-lit backlight module, and a display device. Background technique
  • the liquid crystal display includes a backlight module for providing a surface light source for the liquid crystal display panel. According to the position of the light source, the backlight module can be divided into a side entry type and a direct type.
  • the light source of the direct type backlight module is distributed on the back side of the light emitting surface, and is mostly used in a large-sized display screen.
  • the backlight module is usually provided with a reflection sheet 11 to improve the utilization of the lamp tube 13 as a light source, where A is a light-emitting surface.
  • the reflective sheet 11 in the conventional direct type backlight module is generally designed to be flat, as shown in FIG.
  • Such a reflection sheet does not uniformly reflect light generated by the light source. Therefore, the light near the light source is strong, and the light away from the light source is weak, which causes the Mura of the liquid crystal display to be poor. Mura is a general term for uneven color.
  • problems are solved by increasing the distance between the light emitting surface and the light source, which in turn makes the overall thickness of the backlight module excessive. Summary of the invention
  • Embodiments of the present invention provide a reflective sheet for use in a direct type backlight module having a plurality of protrusions on the reflective sheet, the positions of the protrusions corresponding to positions of the lamps in the backlight module.
  • the protrusion may be located directly below the tube.
  • the height of the protrusions may be less than the height of the light mixing.
  • the projections may be inverted V-shaped projections.
  • the reflective sheet may be a white reflective sheet or a silver reflective sheet.
  • Embodiments of the present invention also provide a direct type backlight module including the above-described reflective sheet.
  • the reflective sheet may be fixed on the back panel of the backlight module, for example, by double-sided tape on the back panel of the backlight module.
  • the back plate may also have a plurality of protrusions and have the same protrusions as the reflection sheets shape.
  • Embodiments of the present invention also provide a display device including the above-described direct type backlight module.
  • DRAWINGS
  • FIG. 1 is a schematic view showing a light reflected from a reflective sheet in the prior art
  • FIG. 2 is a schematic structural view of a reflective sheet according to an embodiment of the present invention.
  • FIG. 3 is a schematic view showing a light reflected from a reflective sheet in an embodiment of the present invention.
  • FIG. 4 is a schematic view showing a structure of a backlight having a bump on the back plate. detailed description
  • the embodiment of the present invention provides a reflective sheet for use in a direct type backlight module.
  • the reflective sheet has a plurality of protrusions, and the position of the protrusion corresponds to the position of the lamp tube in the backlight module, and is usually located. Directly below the tube.
  • the height of the protrusion should be smaller than the height of the light mixing, wherein the height of the protrusion refers to the distance between the vertex of the protrusion and the flat surface of the reflection sheet, and the height of the light mixing refers to the flat surface of the reflection sheet to the light The distance between the tubes.
  • the reflective sheet 11 is located above the backing plate 12.
  • the reflective sheet 11 has a plurality of inverted V-shaped projections, and the projections are directly under the tube 13.
  • the position of the projection corresponds to the position of the bulb 13.
  • the two inclined faces of the inverted V-shaped projections may be connected by a circular arc surface, thereby further utilizing the circular arc surface as a reflecting surface.
  • the reflection sheet 11 has an unsealing line at a bend, and the reflection sheet 11 may be, for example, a white reflection sheet or a silver reflection sheet used for a conventional backlight.
  • Figure 3 is a schematic illustration of a reflective sheet reflecting light in an embodiment of the invention. Since the reflecting sheet has a plurality of convex structures, the light is unevenly reflected, so that the reflecting sheet reduces the light near the tube. The reflection acts to enhance the reflection of light away from the tube, thereby making the light reflected onto the illuminating surface more uniform.
  • the backlight module having the reflection sheet according to the embodiment of the present invention is applied to a liquid crystal display, the color of the display screen can be made more uniform, the Mura is reduced, and the display effect is improved.
  • the embodiment of the present invention further provides a direct-type backlight module, including the above-mentioned reflective sheet, and further includes a back plate, a lamp tube, and the like, and the reflective sheet is fixed on the back plate.
  • the reflective sheet may be adhered to the back plate by an adhesive, a double-sided tape or the like
  • the lamp tube is a CCFL lamp (cold cathode fluorescent lamp)
  • the distance between the lamp tube and the reflection sheet in the backlight module satisfies the mixing. Light height requirements.
  • the backing plate may be flat or may have a plurality of protrusions. As shown in Fig. 4, the reflection sheet 11 is attached to the back sheet 22, and the back sheet 22 has a convex structure identical to that of the reflection sheet 11. Further, the flat reflective sheet of the prior art can also be attached to the back plate having a plurality of protrusions, so that the film also has a convex structure to achieve a more uniform light.
  • Embodiments of the present invention also provide a display device including the above-described direct type backlight module.
  • the embodiment of the present invention reduces the shape of the reflection sheet so that the reflection sheet reduces the reflection effect on the light near the light source, and at the same time enhances the reflection effect on the light away from the light source, thereby making the display color more uniform and improving the display effect.

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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)

Abstract

A reflector plate, a downright backlight module and a display device. A plurality of bulges are provided on the reflector plate (11), and the locations of the bulges correspond to the locations of lamp tubes (13) in the backlight module. The downright backlight module comprises the reflector plate (11). The display device comprises the downright backlight module. By changing the shape of the reflector plate (11), the reflector plate (11) can be made to reduce the reflection of light in the location near a light source and enhance the reflection of light in the location far away from the light source, thereby making the display colour more uniform and improving the display effect.

Description

反射片、 直下式背光模组及显示装置 技术领域  Reflective sheet, direct type backlight module and display device
本发明的实施例涉及显示器的背光技术领域， 具体涉及一种反射片、 直 下式背光模组及显示装置。 背景技术  Embodiments of the present invention relate to the field of backlight technologies for displays, and in particular, to a reflective sheet, a direct-lit backlight module, and a display device. Background technique
近年来， 液晶显示屏广泛应用于手机、 便携电脑、 平板电视等消费电子 产品中。 液晶显示器中含有背光模组， 用于为液晶显示面板提供面光源。 根 据光源的位置不同， 背光模组可分为侧入式和直下式。 其中直下式背光模组 的光源分布于发光面的背面， 多用于大尺寸的显示屏中。  In recent years, liquid crystal displays have been widely used in consumer electronic products such as mobile phones, portable computers, and flat-panel televisions. The liquid crystal display includes a backlight module for providing a surface light source for the liquid crystal display panel. According to the position of the light source, the backlight module can be divided into a side entry type and a direct type. The light source of the direct type backlight module is distributed on the back side of the light emitting surface, and is mostly used in a large-sized display screen.
背光模组中通常配置有反射片 11，来提高作为光源的灯管 13，的利用率， 其中 A为出光面。 现有直下式背光模组中的反射片 11，通常设计为平整的， 如图 1所示。 此种反射片对光源产生的光进行的反射不均匀。 因此， 靠近光 源的地方光线较强， 远离光源的地方光线较弱， 造成了液晶显示器的 Mura 不良， Mura是色泽不均匀的统称。现有技术中通过增大发光面与光源之间的 距离来解决此类问题， 然而这又使得背光模组整体厚度过大。 发明内容  The backlight module is usually provided with a reflection sheet 11 to improve the utilization of the lamp tube 13 as a light source, where A is a light-emitting surface. The reflective sheet 11 in the conventional direct type backlight module is generally designed to be flat, as shown in FIG. Such a reflection sheet does not uniformly reflect light generated by the light source. Therefore, the light near the light source is strong, and the light away from the light source is weak, which causes the Mura of the liquid crystal display to be poor. Mura is a general term for uneven color. In the prior art, such problems are solved by increasing the distance between the light emitting surface and the light source, which in turn makes the overall thickness of the backlight module excessive. Summary of the invention
本发明的实施例提供了一种反射片， 应用于直下式背光模组中， 所述反 射片上具有多个凸起， 所述凸起的位置与背光模组中灯管的位置相对应。  Embodiments of the present invention provide a reflective sheet for use in a direct type backlight module having a plurality of protrusions on the reflective sheet, the positions of the protrusions corresponding to positions of the lamps in the backlight module.
所述凸起可以位于所述灯管的正下方。  The protrusion may be located directly below the tube.
所述凸起的高度可以小于混光高度。  The height of the protrusions may be less than the height of the light mixing.
所述凸起可以为倒 V型凸起。  The projections may be inverted V-shaped projections.
所述反射片可以为白反射片或者银色反射片。  The reflective sheet may be a white reflective sheet or a silver reflective sheet.
本发明的实施例还提供一种直下式背光模组， 其包括上述的反射片。 所述反射片可以固定于所述背光模组的背板上， 例如通过双面胶粘贴于 所述背光模组的背板上。  Embodiments of the present invention also provide a direct type backlight module including the above-described reflective sheet. The reflective sheet may be fixed on the back panel of the backlight module, for example, by double-sided tape on the back panel of the backlight module.
所述背板上也可以具有多个凸起， 并且与所述反射片上的凸起具有相同 的形状。 The back plate may also have a plurality of protrusions and have the same protrusions as the reflection sheets shape.
本发明的实施例还提供一种显示装置， 其包括上述的直下式背光模组。 附图说明  Embodiments of the present invention also provide a display device including the above-described direct type backlight module. DRAWINGS
图 1是现有技术中反射片反射光线的示意图；  1 is a schematic view showing a light reflected from a reflective sheet in the prior art;
图 2是依照本发明一种实施例的反射片结构示意图；  2 is a schematic structural view of a reflective sheet according to an embodiment of the present invention;
图 3是本发明的实施例中反射片反射光线的示意图；  3 is a schematic view showing a light reflected from a reflective sheet in an embodiment of the present invention;
图 4是背板具有凸起的背光源结构示意图。 具体实施方式  4 is a schematic view showing a structure of a backlight having a bump on the back plate. detailed description
为使本发明实施例的目的、 技术方案和优点更加清楚， 下面将结合本发 明实施例的附图，对本发明实施例的技术方案进行清楚、 完整地描述。显然， 所描述的实施例是本发明的一部分实施例， 而不是全部的实施例。 基于所描 述的本发明的实施例， 本领域普通技术人员在无需创造性劳动的前提下所获 得的所有其他实施例， 都属于本发明保护的范围。 下面结合附图和实施例， 对本发明的具体实施方式作进一步详细描述。 以下实施例用于说明本发明， 但不用来限制本发明的范围。  The technical solutions of the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings of the embodiments of the present invention. It is apparent that the described embodiments are part of the embodiments of the invention, rather than all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the described embodiments of the present invention without departing from the scope of the invention are within the scope of the invention. The specific embodiments of the present invention are further described in detail below with reference to the drawings and embodiments. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
本发明的实施例提供一种反射片， 应用于直下式背光模组中， 所述反射 片上具有多个凸起， 所述凸起的位置与背光模组中灯管的位置相对应， 通常 位于所述灯管的正下方。 所述凸起的高度应小于混光高度， 其中， 所述凸起 的高度指凸起的顶点与反射片的平整表面之间的距离， 所述混光高度指所述 反射片平整面到灯管之间的距离。  The embodiment of the present invention provides a reflective sheet for use in a direct type backlight module. The reflective sheet has a plurality of protrusions, and the position of the protrusion corresponds to the position of the lamp tube in the backlight module, and is usually located. Directly below the tube. The height of the protrusion should be smaller than the height of the light mixing, wherein the height of the protrusion refers to the distance between the vertex of the protrusion and the flat surface of the reflection sheet, and the height of the light mixing refers to the flat surface of the reflection sheet to the light The distance between the tubes.
图 2是依照本发明一种实施例的反射片结构示意图，图中反射片 11位于 背板 12之上， 反射片 11具有多个倒 V型凸起， 凸起位于灯管 13的正下方， 凸起的位置与灯管 13的位置相对应。 所述倒 V型凸起的两个斜面之间可以 通过圓弧面连接，从而进一步利用该圓弧面作为反射面。所述反射片 11的弯 折处具有启封线，所述反射片 11例如可以为常规背光使用的白反射片或者银 色反射片。  2 is a schematic structural view of a reflective sheet according to an embodiment of the present invention. The reflective sheet 11 is located above the backing plate 12. The reflective sheet 11 has a plurality of inverted V-shaped projections, and the projections are directly under the tube 13. The position of the projection corresponds to the position of the bulb 13. The two inclined faces of the inverted V-shaped projections may be connected by a circular arc surface, thereby further utilizing the circular arc surface as a reflecting surface. The reflection sheet 11 has an unsealing line at a bend, and the reflection sheet 11 may be, for example, a white reflection sheet or a silver reflection sheet used for a conventional backlight.
图 3是本发明的实施例中反射片反射光线的示意图。 由于反射片上具有 多个凸起结构， 对光进行不均等反射， 使得反射片在靠近灯管处减少对光的 反射作用， 而在远离灯管处加强对光的反射作用， 从而使反射到发光面上的 光线更加均匀。 将具有本发明的实施例所述反射片的背光模组应用于液晶显 示器中， 能够使显示画面的色泽更均匀， 减小 Mura不良， 提高显示效果。 Figure 3 is a schematic illustration of a reflective sheet reflecting light in an embodiment of the invention. Since the reflecting sheet has a plurality of convex structures, the light is unevenly reflected, so that the reflecting sheet reduces the light near the tube. The reflection acts to enhance the reflection of light away from the tube, thereby making the light reflected onto the illuminating surface more uniform. When the backlight module having the reflection sheet according to the embodiment of the present invention is applied to a liquid crystal display, the color of the display screen can be made more uniform, the Mura is reduced, and the display effect is improved.
本发明的实施例还提供了一种直下式背光模组， 包括上述反射片， 还包 括背板、 灯管等， 所述反射片固定于背板上。 例如， 反射片可以通过粘结剂、 双面胶等粘贴于所述背板上， 所述灯管为 CCFL灯（冷阴极荧光灯） ， 背光 模组中灯管与反射片之间的距离满足混光高度的要求。  The embodiment of the present invention further provides a direct-type backlight module, including the above-mentioned reflective sheet, and further includes a back plate, a lamp tube, and the like, and the reflective sheet is fixed on the back plate. For example, the reflective sheet may be adhered to the back plate by an adhesive, a double-sided tape or the like, the lamp tube is a CCFL lamp (cold cathode fluorescent lamp), and the distance between the lamp tube and the reflection sheet in the backlight module satisfies the mixing. Light height requirements.
所述背板可以是平整的， 也可以具有多个凸起。 如图 4中所示， 反射片 11贴附于背板 22上，背板 22具有与反射片 11的凸起形状相同的凸起结构。 进一步地,还可以将现有技术中的平整反射片贴附到具有多个凸起的背板上， 从而^ 射片也具有凸起结构， 到达^ 射光线更加均匀的目的。  The backing plate may be flat or may have a plurality of protrusions. As shown in Fig. 4, the reflection sheet 11 is attached to the back sheet 22, and the back sheet 22 has a convex structure identical to that of the reflection sheet 11. Further, the flat reflective sheet of the prior art can also be attached to the back plate having a plurality of protrusions, so that the film also has a convex structure to achieve a more uniform light.
本发明的实施例还提供一种显示装置， 其包括上述的直下式背光模组。 本发明的实施例通过改变反射片的形状， 使得反射片在靠近光源处减少 对光的反射作用， 同时在远离光源处加强对光的反射作用， 从而使显示色泽 更均匀， 提高显示效果。  Embodiments of the present invention also provide a display device including the above-described direct type backlight module. The embodiment of the present invention reduces the shape of the reflection sheet so that the reflection sheet reduces the reflection effect on the light near the light source, and at the same time enhances the reflection effect on the light away from the light source, thereby making the display color more uniform and improving the display effect.
以上所述仅是本发明的优选实施方式， 应当指出， 对于本技术领域的普 通技术人员来说， 在不脱离本发明技术原理的前提下， 还可以做出若干改进 和替换， 这些改进和替换也应视为本发明的保护范围。  The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make several improvements and substitutions without departing from the technical principles of the present invention. It should also be considered as the scope of protection of the present invention.

Claims

权利要求书 claims
1、 一种反射片， 用于直下式背光模组中， 其中， 所述反射片的平整表面 上具有多个凸起， 所述凸起的位置与背光模组中灯管的位置相对应。 1. A reflective sheet used in a direct-lit backlight module, wherein the flat surface of the reflective sheet has a plurality of protrusions, and the positions of the protrusions correspond to the positions of the lamp tubes in the backlight module.
2、如权利要求 1所述的反射片，其中，所述凸起位于所述灯管的正下方。 2. The reflective sheet according to claim 1, wherein the protrusion is located directly below the lamp tube.
3、 如权利要求 1所述的反射片， 其中， 所述凸起的高度小于混光高度， 所述凸起的高度为凸起的顶点与反射片的平整表面之间的距离， 所述混光高 度为所述反射片平整面到灯管之间的距离。 3. The reflective sheet according to claim 1, wherein the height of the protrusion is less than the height of the mixed light, the height of the protrusion is the distance between the vertex of the protrusion and the flat surface of the reflective sheet, and the height of the mixed light is The light height is the distance between the flat surface of the reflective sheet and the lamp tube.
4、 如权利要求 1至 3中任一项所述的反射片， 其中， 所述凸起为倒 V 型凸起。 4. The reflective sheet according to any one of claims 1 to 3, wherein the protrusion is an inverted V-shaped protrusion.
5、 如权利要求 4所述的反射片， 其中所述倒 V型凸起的两个斜面之间 通过圓弧面连接。 5. The reflective sheet according to claim 4, wherein the two inclined surfaces of the inverted V-shaped protrusion are connected by an arc surface.
6、如权利要求 1至 5中任一项所述的反射片， 其中， 所述反射片为白反 射片或者银色反射片。 6. The reflective sheet according to any one of claims 1 to 5, wherein the reflective sheet is a white reflective sheet or a silver reflective sheet.
7、一种直下式背光模组，其包括如权利要求 1-6中任一项所述的反射片。 7. A direct-lit backlight module, comprising the reflective sheet according to any one of claims 1-6.
8、如权利要求 7所述的直下式背光模组， 其中， 所述反射片固定于所述 背光模组的背板上。 8. The direct-lit backlight module of claim 7, wherein the reflective sheet is fixed on the backplate of the backlight module.
9、如权利要求 7或 8所述的直下式背光模组， 其中， 所述背板上具有多 个凸起， 并且与所述反射片上的凸起具有相同的形状。 9. The direct-lit backlight module according to claim 7 or 8, wherein the back plate has a plurality of protrusions and has the same shape as the protrusions on the reflective sheet.
10、 一种显示装置， 其包括如权利要求 7-9中任一项所述的直下式背光 模组。 10. A display device comprising the direct backlight module according to any one of claims 7-9.
PCT/CN2013/086744 2013-05-09 2013-11-08 Reflector plate, downright backlight module and display device WO2014180102A1 (en)

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