WO2019037356A1 - 直下式背光模组和显示器 - Google Patents

直下式背光模组和显示器 Download PDF

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Publication number
WO2019037356A1
WO2019037356A1 PCT/CN2017/116791 CN2017116791W WO2019037356A1 WO 2019037356 A1 WO2019037356 A1 WO 2019037356A1 CN 2017116791 W CN2017116791 W CN 2017116791W WO 2019037356 A1 WO2019037356 A1 WO 2019037356A1
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WIPO (PCT)
Prior art keywords
sheet
reflective
backlight module
reflective sheet
type backlight
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PCT/CN2017/116791
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English (en)
French (fr)
Inventor
郑少洪
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广州视源电子科技股份有限公司
广州视睿电子科技有限公司
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Application filed by 广州视源电子科技股份有限公司, 广州视睿电子科技有限公司 filed Critical 广州视源电子科技股份有限公司
Publication of WO2019037356A1 publication Critical patent/WO2019037356A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S4/00—Lighting devices or systems using a string or strip of light sources
    • F21S4/20—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports
    • F21S4/28—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports rigid, e.g. LED bars
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors

Definitions

  • the utility model relates to the technical field of display, in particular to a direct type backlight module and a display.
  • direct-lit backlight modules have also been used more and more widely.
  • the direct type backlight module is generally composed of a light bar, a reflection sheet and a diffusion plate, and the electric energy is converted into light energy through the light bar, and the light emitted from the light bar is transmitted through the mesh point at the bottom of the reflection sheet to reflect the received light to realize the light.
  • the screen is atomized by the diffuser to improve the uniformity of the screen.
  • the inventors found in the process of implementing the present invention that the prior art has the following technical defects: the dots at the bottom of the reflective sheet are usually arranged in an array, and the apex position of the bottom of the reflective sheet is compared with the other points. The large minimum distance, and generally only receives the light emitted by the LED at a position closest to the distance, so that the backlight module has a vignetting problem, which affects the uniformity of the picture.
  • the embodiment of the present invention provides a direct-lit backlight module and a display to solve the technical problem that the backlight module has a vignetting angle and a low image uniformity in the prior art.
  • an embodiment of the present invention provides a direct type backlight module including a first reflective sheet 10 and at least one second reflective sheet 20; the second reflective sheet 20 is disposed on the first reflective sheet 10 The inner side of the top corner, the reflecting surface of the second reflection sheet 20 and the reflecting surface of the first reflection sheet 10 The reflectivity of the reflective surface of the second reflection sheet 20 is higher than the reflectance of the reflective surface of the first reflection sheet 10.
  • the second reflective sheet 20 is attached to the first reflective sheet 10.
  • the first reflective sheet 10 includes a bottom surface 11 and a side surface 12;
  • the second reflective sheet 20 includes a first sub-reflective sheet 21 and a second sub-reflecting sheet 22, and the first sub-reflecting sheet 21 and the The second sub-reflective sheet 22 has a planar structure, one side of the first sub-reflective sheet 21 coincides with one side of the second sub-reflective sheet 22, and the first sub-reflective sheet 21 and the second sub-reflective sheet
  • the sheets 22 are respectively attached to the two adjacent side faces 12 of the first reflection sheet 10.
  • first sub-reflecting sheet 21 and the second sub-reflecting sheet 22 have a triangular structure.
  • the number of the second reflection sheets 20 is four, and the four second reflection sheets 20 are respectively located at the four vertex angles of the first reflection sheet 10.
  • the reflective surface of the second reflective sheet 20 is plated with a silver reflective layer, an aluminum reflective layer or a silver-aluminum mixed reflective layer.
  • the direct type backlight module provided by the present invention further includes an LED light bar 30 and a diffusion plate 40.
  • the LED light bar 30 is mounted under the first reflection sheet 10, and the diffusion plate 40 is installed in the The upper side of the first reflection sheet 10 is described.
  • a brightness enhancement sheet 50 and a diffusion sheet 60 are mounted.
  • the brightness enhancement sheet 50 is mounted above the diffusion plate 40, and the diffusion sheet 60 is mounted above the brightness enhancement sheet 50.
  • the second reflective sheet 20 is integrally formed with the first reflective sheet 10.
  • the embodiment of the present invention further provides a display, including the direct type backlight module according to the embodiment of the present invention.
  • the direct-lit backlight module and the display provided by the embodiment of the present invention increase the direct reflection type at the top corner position of the first reflection sheet of the backlight module, and the second reflection sheet having higher reflectance than the first reflection sheet.
  • the intensity of the light reflected by the corner position of the optical module thereby improving the light intensity at the corner position of the direct type backlight module, avoiding the problem of the vignetting angle of the direct type backlight module, and improving the uniformity of the picture of the display device corresponding to the direct type backlight module Sex.
  • FIG. 1A is a schematic structural view of a first direct type backlight module according to Embodiment 1 of the present invention.
  • FIG. 1B is a schematic structural view and a positional view of a second reflective sheet in a first direct type backlight module according to Embodiment 1 of the present invention
  • FIG. 1C is a schematic structural view of a second direct type backlight module according to Embodiment 1 of the present invention.
  • FIG. 1D is a schematic view showing the structure and position of a second reflection sheet in a second direct type backlight module according to Embodiment 1 of the present invention
  • FIG. 2A is a schematic structural view of a first direct type backlight module according to Embodiment 2 of the present invention.
  • 2B is a schematic view showing the structure and position of a second reflection sheet in the first direct type backlight module according to the second embodiment of the present invention
  • FIG. 3A is a schematic structural view of a second direct type backlight module according to Embodiment 2 of the present invention.
  • 3B is a schematic view showing the structure and position of a second reflection sheet in a second direct type backlight module according to Embodiment 2 of the present invention
  • FIG. 4A is a schematic structural view of a third direct type backlight module according to Embodiment 2 of the present invention.
  • FIG. 4B is a schematic structural view and a positional view of a second reflective sheet in a third direct type backlight module according to Embodiment 2 of the present invention.
  • 5A is a schematic structural view of a fourth direct type backlight module according to Embodiment 2 of the present invention.
  • 5B is a schematic structural view of a fifth direct type backlight module according to Embodiment 2 of the present invention.
  • FIG. 5C is a schematic diagram of a light path in a fifth backlight module according to Embodiment 2 of the present invention.
  • Embodiment 1 of the present invention provides a direct type backlight module.
  • FIG. 1A is a schematic structural view of a direct type backlight module according to Embodiment 1 of the present invention.
  • the direct type backlight module includes: a first reflective sheet 10 and at least one second reflective sheet 20; the second reflective sheet 20 is disposed on an inner side of a top corner of the first reflective sheet 10, The reflective surface of the second reflective sheet 20 is connected to the reflective surface of the first reflective sheet 10; the reflective surface of the second reflective sheet 20 has a higher reflectance than the reflective surface of the first reflective sheet 10
  • the structure and position of the second reflection sheet 20 are as shown in FIG. 1B.
  • the first reflective sheet 10 may include a bottom surface 11 and a side surface 12, and the bottom surface 11 may be a quadrilateral shape.
  • the bottom surface 11 of the first reflection sheet 10 is a quadrilateral structure.
  • the number of the side surfaces 12 included in the first reflection sheet 10 may be four.
  • the four side faces 12 may be connected to the bottom surface 11 of the first reflecting edge 10 through the four sides of the bottom surface 11 of the first reflecting sheet 10, or the four edges of the first reflecting sheet 10 may be bent according to the set axis.
  • the angled portion, the bent portions of the four edges form the four side faces 12 of the first reflection sheet 10, and the intermediate unbent portion forms the bottom surface 11 of the first reflection sheet 10, wherein the set angle of the four edges is bent Same or different.
  • the first reflection sheet 10 may be provided with a mesh for transmitting light emitted by the light source, and the meshes may be uniformly or non-uniformly distributed on the bottom surface 11 of the first reflection sheet 10, which is not limited thereto. In view of the uniformity of the transmitted light, optionally, the meshes may be evenly distributed on the bottom surface 11 of the first reflective sheet 10.
  • the first reflective sheet 10 can be used to reflect the light received by the reflective surface thereof to achieve secondary utilization of the light.
  • the reflectance of the reflective surface of the first reflective sheet 10 may range from 95% to 98.5%.
  • the reflective material may be coated or foamed on the inner surface of the first reflective sheet 10 (the four surfaces of the side surface 12 facing the inner side of the first reflective sheet 10 and the upper surface of the bottom surface 11 in the first reflective sheet 10).
  • the reflective surface of the first reflective sheet 10 wherein the first reflective sheet 10 may be a polyethylene terephthalate (PET) material; the reflective material may be a flexible particle such as metal oxide TiO 2 or the like.
  • PET polyethylene terephthalate
  • the second reflective sheet 20 can be used to reflect the light received by the reflective surface thereof to achieve secondary utilization of the light.
  • the reflectivity of the reflective surface of the second reflective sheet 20 is greater than the reflectivity of the reflective surface of the first reflective sheet 10.
  • the reflectivity of the reflective surface of the second reflective sheet 20 may range from 98.5% to 99.9%, and the specific value may be reflected by the reflective sheet.
  • the material of the surface is determined.
  • the reflective surface of the second reflective sheet 20 may be the same or different material from the inner surface or other surfaces thereof.
  • the reflective material may be coated on the first surface of the second reflective sheet 20 facing the interior of the first reflective sheet 10 to form a second reflection.
  • the reflective surface of the sheet 20, the reflective material can be The surface of the second reflective sheet 20 is coated with a silver reflective layer, an aluminum reflective layer or a silver-aluminum mixed reflective layer.
  • the second reflective sheet 20 may be a planar structure or a non-planar surface.
  • the shape of the first reflective sheet 10 may be rectangular, trapezoidal, triangular or other shapes as needed; the reflective surface of the second reflective sheet 20 and the reflective surface of the bottom surface 11 of the first reflective sheet 10 and corresponding
  • the angle of the reflection surface of the side surface 12 of the first reflection sheet 10 may be greater than or equal to 90°, that is, the second reflection sheet 20 may or may not be attached to the first reflection sheet 10.
  • the second reflective sheet 20 can be attached to the first reflective sheet 10 (as shown in FIGS. 1C and 1D ) to reduce the internal space of the first reflective sheet 10 .
  • the angle between the reflection surface of the second reflection sheet 20 and the reflection surface of the corresponding first reflection sheet 10 is 180°, that is, the second emission sheet facing away from the reflection surface of the second reflection sheet 20
  • the non-reflective surface of 20 is adhered to the reflective surface of the first radiating sheet 10; alternatively, the second reflective sheet 20 is integrally formed with the first reflective sheet 10, that is, directly at the corresponding position of the first reflective sheet 10.
  • a reflective material having a higher reflectance is applied to form a second reflective sheet 20 having a higher reflectance than the reflectance of the first reflective sheet 10 at a corresponding position of the first reflective sheet 10.
  • the number of the second reflective sheets 20 can be set as needed. For example, one, four or other numbers of second reflective sheets 20 can be disposed in the backlight module.
  • the number of the second reflective sheets 20 is four, and the four The second reflection sheets 20 are respectively located at the four apex angles of the first reflection sheet 10. In the embodiment of the present invention, the number of the second reflection sheets 20 is four.
  • FIG. 1A is only a schematic view of the embodiment of the present invention, and the shape of the first reflective sheet 10 and the shape and number of the second reflective sheet 20 are not formed in the embodiment of the present invention.
  • the limitation is that when the first reflection sheet 10 and/or the second reflection sheet 20 have other shapes or the number of the first reflection sheets 10 is other values, it is also within the protection range of the present invention.
  • the direct type backlight module provided in the first embodiment of the present invention is at the top of the first reflection sheet of the backlight module Increasing the second reflection sheet having a higher reflectance than the first reflection sheet at the angular position can improve the intensity of the light reflected by the corner position of the direct type backlight module, thereby improving the light intensity at the corner position of the direct type backlight module, and avoiding the direct type
  • the backlight module has a vignetting problem, which improves the uniformity of the picture of the display device corresponding to the direct type backlight module.
  • FIG. 2A is a schematic structural view of a direct type backlight module according to an embodiment of the present invention
  • FIG. 2B is a schematic diagram showing the structure and position of the second reflective sheet 20 in the direct type backlight module according to the embodiment.
  • the present embodiment is optimized on the basis of the above embodiment, as shown in FIG. 2A and FIG.
  • the first reflective sheet 10 includes a bottom surface 11 and a side surface 12;
  • the second reflective sheet 20 includes a first sub-reflective sheet 21 and a second sub-reflective sheet 22, and the first sub-reflective sheet 21 and the second sub-reflective sheet 22 have a planar structure, and the first sub-reflective sheet One side of the second sub-reflecting sheet 22 is overlapped with one side of the second sub-reflecting sheet 22, and the first sub-reflecting sheet 21 and the second sub-reflecting sheet 22 are respectively attached to two adjacent sides of the first reflecting sheet 10. On the side 12.
  • the first sub-reflecting sheet 21 and the second sub-reflecting sheet 22 can be attached to the reflecting surface of the corresponding first reflecting sheet 10, and the shapes and sizes of the first sub-reflecting sheet 21 and the second sub-reflecting sheet 22 can be
  • the first sub-reflecting sheet 21 and the second sub-reflecting sheet 22 may be triangular, quadrangular or other shapes, which are not limited herein. In practical applications, in the vicinity of the four corner positions of the first reflection sheet 10, generally the smaller the distance from the apex angle of the corresponding first reflection sheet 10, the weaker the intensity of the received light at the position, therefore, preferably,
  • the first sub-reflective sheet 21 and the second sub-reflecting sheet 22 have a triangular structure. (At this time, the schematic diagram of the direct-type backlight module is as shown in FIG. 3A, and the position and structure of the second sub-reflecting sheet 22 are as follows. Figure 3B).
  • the second reflective sheet 20 may further include a third sub- The apex angle of the reflection sheet 23 and the third sub-reflection sheet 23 is equal to the apex angle of the bottom surface 11 of the first reflection sheet 10, and the two sides of the apex angle are respectively associated with the first sub-reflection sheet 21 and the second sub-reflection sheet 22 The bottom edges coincide.
  • the shape and size of the third sub-reflecting sheet 23 can be set as needed.
  • the third sub-reflecting sheet 23 can be provided in a triangular structure or the like.
  • the direct type backlight module provided in this embodiment may further include an LED light bar 30 and a diffusion plate 40, and the LED The light bar 30 is mounted below the first reflection sheet 10, and the diffusion plate 40 is mounted above the first reflection sheet 10.
  • the LED light bar 30 is a backlight light-emitting device of a direct-type backlight module, which can be used to convert electrical energy into light.
  • the LED light bar 30 can include a lens, and the lens can be located above the LED light bar 30 to expand the LED.
  • the light-emitting angle of the light bar 30; the diffusing plate 40 can diffuse the incident light of any angle into the light of the beam angle of 160°-176° by using the principle of light refraction, thereby improving the correspondence of the direct-type backlight module by changing the beam angle of the light beam.
  • the thickness of the diffusion plate 40 may range from 1.2 mm to 2 mm. At this time, the diffusion plate 40 has a certain strength. When other films are present in the direct type backlight module, the diffusion plate 40 may also have a certain effect on other films. Supporting role.
  • the direct type backlight module provided in this embodiment may further include a brightness enhancing sheet 50 and a diffusion sheet 60, and the brightness enhancing sheet 50 Mounted above the diffusion plate 40, the diffusion sheet 60 is mounted above the brightness enhancement sheet 50.
  • the brightness enhancing sheet 50 can be a prism structure for improving the brightness of the display corresponding to the direct type backlight module;
  • the diffusion sheet 60 can be a film coated with a diffusion layer based on PET material, which can utilize the scattering basis of light. The angle of the large light is emitted, thereby atomizing the image, further improving the uniformity of the displayed image of the display corresponding to the direct type backlight module.
  • the transmission path of the light in a cycle of the direct type backlight module may be: the light emitted by the LED strip 30 is transmitted through the mesh in the first reflective sheet 10 to the diffusion plate. 40; the first reflection sheet 10 and the second reflection sheet 20 reflect the light received in the previous cycle process and the current cycle back to the diffusion plate 40; the diffusion plate 40 reflects the received partial light back to the first reflection sheet 10 and the second reflective sheet 20, the received part of the light is transmitted to the brightness enhancing sheet 50, wherein the light received by the diffusing plate 40 includes both the light emitted by the LED strip 30 and the first reflecting sheet during the cycle. 10 and the light reflected by the second reflection sheet 20; the brightness enhancement sheet 50 reflects the received partial light and transmits the received part of the light to the diffusion sheet 60; the diffusion sheet 60 reflects the received partial light and transmits Another part of the light received.
  • the direct-lit backlight module provided in the second embodiment of the present invention adds a second reflective sheet having a higher reflectance than the first reflective sheet and including at least two sub-reflective sheets at a top corner position of the first reflective sheet of the backlight module.
  • the sub-reflecting edge of the two reflective sheets is attached to the first reflective sheet, which can further improve the intensity of the light reflected by the corner position of the direct-lit backlight module, thereby further improving the light intensity at the corner position of the direct-lit backlight module, and avoiding the direct-lit backlight.
  • the module has a vignetting problem, which improves the uniformity of the picture of the display device corresponding to the direct type backlight module.
  • the third embodiment of the present invention provides a display, which includes the direct type backlight module according to the embodiment of the present invention, and has the corresponding beneficial effects of the direct type backlight module provided by the embodiment of the present invention.
  • the direct type backlight module provided by any embodiment of the present invention.

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Abstract

一种直下式背光模组和显示器。直下式背光模组包括第一反射片和至少一个第二反射片；第二反射片设置于第一反射片的顶角的内侧，第二反射片的反射面与第一反射片的反射面相连；第二反射片的反射面的反射率高于第一反射片的反射面的反射率。通过在直下式背光模组光线强度较低的角落区域增加反射率较高的第二反射片，可以提高直下式背光模组角落位置的光线强度，避免直下式背光模组出现暗角问题，从而提高直下式背光模组对应的显示设备的画面的均匀性。

Description

直下式背光模组和显示器 技术领域
本实用新型涉及显示技术领域，尤其涉及一种直下式背光模组和显示器。
背景技术
目前，随着电脑和电视等电子产品应用范围的扩大，直下式背光模组也得到了越来越广泛的应用。
直下式背光模组通常由灯条、反射片和扩散板构成，通过灯条将电能转化为光能，通过反射片底部的网点透射灯条发出的光线并反射所接收到的光线以实现对光线的二次利用，通过扩散板雾化画面，提高画面的均匀性。然而，发明人在实现本实用新型的过程中发现现有技术存在如下技术缺陷：反射片底部的网点通常以列阵形式排列，反射片底部的顶角位置相对于其他位置而言与网点具有较大的最小距离，且一般只能接收到与其距离最近的一个网点位置处的发光二极管发射出的光线，使得背光模组存在暗角问题，影响画面的均匀性。
实用新型内容
有鉴于此，本实用新型实施例提供一种直下式背光模组和显示器，以解决现有技术中背光模组存在暗角、画面均匀性较低的技术问题。
第一方面，本实用新型实施例提供了一种直下式背光模组，包括第一反射片10和至少一个第二反射片20；所述第二反射片20设置于所述第一反射片10的顶角的内侧，所述第二反射片20的反射面与所述第一反射片10的反射面相 连；所述第二反射片20的反射面的反射率高于所述第一反射片10的反射面的反射率。
进一步地，所述第二反射片20与所述第一反射片10贴合。
进一步地，所述第一反射片10包括底面11和侧面12；所述第二反射片20包括第一子反射片21和第二子反射片22，所述第一子反射片21与所述第二子反射片22为平面结构，所述第一子反射片21的其中一边与所述第二子反射片22的其中一边重合，所述第一子反射片21与所述第二子反射片22分别贴合于所述第一反射片10的两相邻侧面12上。
进一步地，所述第一子反射片21与所述第二子反射片22为三角形结构。
进一步地，所述第二反射片20的数量为4个，4个所述第二反射片20分别位于所述第一反射片10的四个顶角。
进一步地，所述第二反射片20的反射面上镀有银反射层、铝反射层或者银铝混合反射层。
进一步地，本实用新型提供的直下式背光模组还包括LED灯条30和扩散板40，所述LED灯条30安装于所述第一反射片10的下方，所述扩散板40安装于所述第一反射片10的上方。
进一步地，还包括增亮片50和扩散片60，所述增亮片50安装于所述扩散板40的上方，所述扩散片60安装于所述增亮片50的上方。
进一步地，所述第二反射片20与所述第一反射片10一体成型。
第二方面，本实用新型实施例还提供了一种显示器，包括本实用新型实施例所述的直下式背光模组。
本实用新型实施例提供的直下式背光模组及显示器，在背光模组第一反射片的顶角位置处增加反射率高于第一反射片的第二反射片，可以提高直下式背 光模组角落位置所反射的光线的强度，进而提高直下式背光模组角落位置的光线强度，避免直下式背光模组出现暗角问题，提高直下式背光模组对应的显示设备的画面的均匀性。
附图说明
通过阅读参照以下附图所作的对非限制性实施例所作的详细描述，本实用新型的其它特征、目的和优点将会变得更明显：
图1A为本实用新型实施例一提供的第一种直下式背光模组的结构示意图；
图1B为本实用新型实施例一提供的第一种直下式背光模组中第二反射片的结构与位置示意图；
图1C为本实用新型实施例一提供的第二种直下式背光模组的结构示意图；
图1D为本实用新型实施例一提供的第二种直下式背光模组中第二反射片的结构与位置示意图；
图2A为本实用新型实施例二提供的第一种直下式背光模组的结构示意图；
图2B为本实用新型实施例二提供的第一种直下式背光模组中第二反射片的结构与位置示意图；
图3A为本实用新型实施例二提供的第二种直下式背光模组的结构示意图；
图3B为本实用新型实施例二提供的第二种直下式背光模组中第二反射片的结构与位置示意图；
图4A为本实用新型实施例二提供的第三种直下式背光模组的结构示意图；
图4B为本实用新型实施例二提供的第三种直下式背光模组中第二反射片的结构与位置示意图；
图5A为本实用新型实施例二提供的第四种直下式背光模组的结构示意图；
图5B为本实用新型实施例二提供的第五种直下式背光模组的结构示意图；
图5C为本实用新型实施例二提供的第五种背光模组中的一种光线路径示意图。
图中：
10-第一反射片；20-第二反射片；30-LED灯条；40-扩散板；50-增亮片；60-扩散片；
11-底面；12-侧面；
21-第一子反射片；22-第二子反射片。
具体实施方式
下面结合附图和实施例对本实用新型作进一步的详细说明。可以理解的是，此处所描述的具体实施例仅仅用于解释本实用新型，而非对本实用新型的限定。另外还需要说明的是，为了便于描述，附图中仅示出了与本实用新型相关的部分而非全部内容。
实施例一
本实用新型实施例一提供一种直下式背光模组。图1A是本实用新型实施例一提供的直下式背光模组的结构示意。如图1A所示，该直下式背光模组包括：第一反射片10和至少一个第二反射片20；所述第二反射片20设置于所述第一反射片10的顶角的内侧，所述第二反射片20的反射面与所述第一反射片10的反射面相连；所述第二反射片20的反射面的反射率高于所述第一反射片10的反射面的反射率，第二反射片20的结构与位置示意图如图1B所示。
其中，第一反射片10可以包括底面11和侧面12，其底面11可以为四边形 结构、三角形结或其他多边形结构等等，以下以第一反射片10的底面11为四边形结构为例，此时，相应的，第一反射片10所包含的侧面12的数量可以为四个，四个侧面12可以通过第一反射片10底面11的四个边与第一反射边10的底面11连接，或者，也可以将第一反射片10的四个边缘按照设定的轴线弯折设定角度，四个边缘的弯折部分形成第一反射片10的四个侧面12，中间未弯折部分形成第一反射片10的底面11，其中，四个边缘所弯折的设定角度可以相同或不同。第一反射片10上可以设置有用于透射光源所发出的光线的网孔，各网孔可以均匀或非均匀分布在第一反射片10的底面11上，此处不作有限。考虑到透射光线的均匀性，可选的，各网孔可以在第一反射片10的底面11上均匀分布。
本实施例中，第一反射片10可用于反射其反射面所接收到的光线，以实现对光线的二次利用。其中，第一反射片10反射面的反射率的范围可以为95％～98.5％。示例性的，可以在第一反射片10的内表面(第一反射片10中朝向第一反射片10内侧的侧面12的四个表面和底面11的上表面)涂布或发泡反射材料形成第一反射片10的反射面，其中，第一反射片10可以为聚对苯二甲酸乙二醇酯(Polyethylene Terephthalate，PET)材料；反射材料可以为柔性粒子，如金属氧化物TiO2等。
在上述方案中，第二反射片20可用于反射其反射面所接收到的光线，实现对光线的二次利用。第二反射片20反射面的反射率大于第一反射片10反射面的反射率，如，第二反射片20反射面反射率的范围可以为98.5％～99.9％，其具体数值可以由其反射面的材质决定。其中，第二反射片20反射面与其内部或其他表面可以为相同或不同材质，如，可以在第二反射片20的朝向第一反射片10内部的第一表面涂布反射材料形成第二反射片20的反射面，反射材料可以根据 需要进行确定，可选的，所述第二反射片20的反射面上镀有银反射层、铝反射层或者银铝混合反射层；第二反射片20可以为平面结构，也可以为非平面结构，当第一反射片10为平面结构时，其形状可以根据需要设置为矩形、梯形、三角形或其他形状；第二反射片20反射面与第一反射片10底面11的反射面以及对应的第一反射片10侧面12的反射面的夹角的范围可以大于或等于90°，即第二反射片20可以贴合或不贴合在第一反射片10上。可选的，在本实施例中，所述第二反射片20可以与所述第一反射片10贴合(如图1C和图1D所示)，以降低对第一反射片10内部空间的占用，此时，第二反射片20的反射面与对应所贴合的第一反射片10的反射面的夹角为180°，即与第二反射片20的反射面相背离的第二发射片20的非反射面粘贴于第一发射片10的反射面上；或者，所述第二反射片20与所述第一反射片10一体成型，即，可以直接在第一反射片10的相应位置处涂布反射率较高的反射材料，以在第一反射片10的相应位置处形成反射率高于第一反射片10反射率的第二反射片20。
第二反射片20的数量可以根据需要进行设定，如，背光模组中可以设置1个、4个或其他数量的第二反射片20。当第一反射片10的底面11为四边形结构时，为了进一步提高背光模组对应的显示设备显示画面的均匀性，优选的，所述第二反射片20的数量为4个，4个所述第二反射片20分别位于所述第一反射片10的四个顶角，本实用新型实施例以第二反射片20的数量为4个为例。
在此，需要指出的是，图1A仅为本实用新型实施例的一个示意图，其内所示的第一反射片10的形状、第二反射片20的形状与数量不对本实用新型实施例构成限制，当第一反射片10和/或第二反射片20为其他形状或者第一反射片10的数量为其他数值时，同样在本实用新型的保护范围之内。
本实用新型实施例一提供的直下式背光模组，在背光模组第一反射片的顶 角位置处增加反射率高于第一反射片的第二反射片，可以提高直下式背光模组角落位置所反射的光线的强度，进而提高直下式背光模组角落位置的光线强度，避免直下式背光模组出现暗角问题，提高直下式背光模组对应的显示设备的画面的均匀性。
实施例二
图2A为本实用新型实施例提供的一种直下式背光模组的结构示意图，图2B为本实施例所提供的直下式背光模组中第二反射片20的结构与位置示意图。本实施例在上述实施例的基础上进行优化，如图2A和图2B所示，在本实施例所提供的直下式背光模组中，所述第一反射片10包括底面11和侧面12；所述第二反射片20包括第一子反射片21和第二子反射片22，所述第一子反射片21与所述第二子反射片22为平面结构，所述第一子反射片21的其中一边与所述第二子反射片22的其中一边重合，所述第一子反射片21与所述第二子反射片22分别贴合于所述第一反射片10的两相邻侧面12上。
其中，第一子反射片21和第二子反射片22可贴合在其对应的第一反射片10的反射面上，第一子反射片21和第二子反射片22的形状及大小可以相同或不同，第一子反射片21和第二子反射片22可以为三角形、四边形或其他形状，此处不作限制。实际应用中，在第一反射片10的四个角落位置附近，一般与对应的第一反射片10顶角的距离越小，该位置处接收到的光线的强度越弱，因此，优选的，所述第一子反射片21与所述第二子反射片22为三角形结构(此时，直下式背光模组的结构示意图如图3A所示，第二子反射片22的位置与结构示意图如图3B所示)。
此外，示例性的，如图4A和图4B所示，第二反射片20还可以包括第三子 反射片23，第三子反射片23的某一顶角与第一反射片10底面11的顶角相等，该顶角的两条边分别与第一子反射片21和第二子反射片22的底边重合。第三子反射片23的形状及大小可以根据需要进行设置，如，第三子反射片23可以设置为三角形结构等。
在上述方案的基础上，如图5A所示(图中未给出第二反射片)，本实施例提供的直下式背光模组，还可以包括LED灯条30和扩散板40，所述LED灯条30安装于所述第一反射片10的下方，所述扩散板40安装于所述第一反射片10的上方。其中，LED灯条30为直下式背光模组的背光发光器件，其可用于将电能转化为光，LED灯条30中可包含透镜，透镜可位于LED灯条30灯珠的上方，以扩大LED灯条30的发光角度；扩散板40可利用光的折射原理将任意角度的入射光扩散为光束角为160°～176°的出射光，从而通过改变光线的光束角提高直下式背光模组对应的显示器所显示画面的均匀性。扩散板40的厚度范围可以为1.2mm～2mm，此时，扩散板40具有一定的强度，当直下式背光模组中存在其他膜片时，扩散板40还可对其他膜片起到一定的支撑作用。
在上述方案的基础上，如图5B所示(图中未给出第二反射片)，本实施例提供的直下式背光模组还可以包括增亮片50和扩散片60，所述增亮片50安装于所述扩散板40的上方，所述扩散片60安装于所述增亮片50的上方。其中，增亮片50可以为棱镜结构，用于提升直下式背光模组对应的显示器的亮度；扩散片60可以为一种基于PET材质涂布扩散层的薄膜，其可以利用光的散射基理增大光线的出射角度，从而雾化画面，进一步提升直下式背光模组对应的显示器所显示画面的均匀性。
示例性的，如图5C所示，光线在直下式背光模组一个循环过程中的传输路径可以为：LED灯条30发出的光线经过第一反射片10中的网孔透射至扩散板 40；第一反射片10和第二反射片20将前面各循环过程和本循环过程中所接收到的光线反射回扩散板40；扩散板40将所接收到的部分光线反射回第一反射片10和第二反射片20，将所接收到的另一部分光线透射至增亮片50，其中，扩散板40接收到的光线既包括LED灯条30发出的光线，也包括循环过程中第一反射片10和第二反射片20反射的光线；增亮片50反射所接收到的部分光线，并将所接收到的另一部分光线透射至扩散片60；扩散片60反射所接收到的部分光线，并透射所接收到的另一部分光线。
本实用新型实施例二提供的直下式背光模组，在背光模组第一反射片的顶角位置处增加反射率高于第一反射片且包含至少两个子反射片的第二反射片，第二反射片的子反射边贴合在第一反射片上，可以进一步提高直下式背光模组角落位置所反射的光线的强度，进而进一步提高直下式背光模组角落位置的光线强度，避免直下式背光模组出现暗角问题，提高直下式背光模组对应的显示设备的画面的均匀性。
实施例三
本实用新型实施例三提供一种显示器，该显示器包括本实用新型实施例所述的直下式背光模组，具备本实用新型实施例提供的直下式背光模组相应有益效果。未在本实施例中详尽描述的技术细节，可参见本实用新型任意实施例所提供的直下式背光模组。
注意，上述仅为本实用新型的较佳实施例及所运用技术原理。本领域技术人员会理解，本实用新型不限于这里所述的特定实施例，对本领域技术人员来说能够进行各种明显的变化、重新调整和替代而不会脱离本实用新型的保护范 围。因此，虽然通过以上实施例对本实用新型进行了较为详细的说明，但是本实用新型不仅仅限于以上实施例，在不脱离本实用新型构思的情况下，还可以包括更多其他等效实施例，而本实用新型的范围由所附的权利要求范围决定。

Claims (10)

  1. 一种直下式背光模组，其特征在于，包括第一反射片(10)和至少一个第二反射片(20)；所述第二反射片(20)设置于所述第一反射片(10)的顶角的内侧，所述第二反射片(20)的反射面与所述第一反射片(10)的反射面相连；所述第二反射片(20)的反射面的反射率高于所述第一反射片(10)的反射面的反射率。
  2. 根据权利要求1所述的直下式背光模组，其特征在于，所述第二反射片(20)与所述第一反射片(10)贴合。
  3. 根据权利要求2所述的直下式背光模组，其特征在于，所述第一反射片(10)包括底面(11)和侧面(12)；所述第二反射片(20)包括第一子反射片(21)和第二子反射片(22)，所述第一子反射片(21)与所述第二子反射片(22)为平面结构，所述第一子反射片(21)的其中一边与所述第二子反射片(22)的其中一边重合，所述第一子反射片(21)与所述第二子反射片(22)分别贴合于所述第一反射片(10)的两相邻侧面(12)上。
  4. 根据权利要求3所述的直下式背光模组，其特征在于，所述第一子反射片(21)与所述第二子反射片(22)为三角形结构。
  5. 根据权利要求1所述的直下式背光模组，其特征在于，所述第二反射片(20)的数量为4个，4个所述第二反射片(20)分别位于所述第一反射片(10)的四个顶角。
  6. 根据权利要求1所述的直下式背光模组，其特征在于，所述第二反射片(20)的反射面上镀有银反射层、铝反射层或者银铝混合反射层。
  7. 根据权利要求1-6任意一项所述的直下式背光模组，其特征在于，还包括LED灯条(30)和扩散板(40)，所述LED灯条(30)安装于所述第一反射片(10)的下方，所述扩散板(40)安装于所述第一反射片(10)的上方。
  8. 根据权利要求7所述的直下式背光模组，其特征在于，还包括增亮片(50)和扩散片(60)，所述增亮片(50)安装于所述扩散板(40)的上方，所述扩散片(60)安装于所述增亮片(50)的上方。
  9. 根据权利要求1所述的直下式背光模组，其特征在于，所述第二反射片(20)与所述第一反射片(10)一体成型。
  10. 一种显示器，其特征在于，包括权利要求1-9任意一项所述的直下式背光模组。
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