WO2017088447A1 - 一种直下式led背光模组及包含该背光模组的显示器 - Google Patents

一种直下式led背光模组及包含该背光模组的显示器 Download PDF

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WO2017088447A1
WO2017088447A1 PCT/CN2016/084990 CN2016084990W WO2017088447A1 WO 2017088447 A1 WO2017088447 A1 WO 2017088447A1 CN 2016084990 W CN2016084990 W CN 2016084990W WO 2017088447 A1 WO2017088447 A1 WO 2017088447A1
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backlight module
reflective material
light source
direct
display
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PCT/CN2016/084990
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English (en)
French (fr)
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付常佳
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乐视控股（北京）有限公司
乐视致新电子科技（天津）有限公司
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Publication of WO2017088447A1 publication Critical patent/WO2017088447A1/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
    • F21S8/00—Lighting devices intended for fixed installation

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  • the present application relates to the field of optics, and in particular, to a direct-lit LED backlight module and a display including the same.
  • the backlight module is a kind of light source behind the LCD (Liquid Crystal Display), and its illumination effect directly affects the visual effect of the LCM (Liquid Crystal Display Module).
  • the LCD itself does not emit light, it shows the pattern or the result of its modulation of the light.
  • the backlight module has two types: a direct type backlight module and a side-in type backlight module.
  • the light source of the direct type backlight module is mounted on a bottom plate parallel to the screen, and the light is directly emitted from the bottom.
  • the light source of the side-lit backlight module is mounted on the frame on the side of the screen, and the light is refracted by the light guide plate and then emitted from the screen.
  • the direct-lit backlight module has better color gamut, more natural image effect, more uniform screen brightness, and less screen leakage, and the direct-lit backlight module can enhance contrast and realize dynamic intelligent backlighting. Therefore, the direct type backlight module has better picture quality.
  • the Light Emitting Diode (LED) backlight module is a direct-type backlight module that is widely used.
  • 1 is a schematic cross-sectional structural view of a direct-lit LED backlight module in the prior art.
  • the direct type LED backlight module includes a back plate 11 , a reflective film 12 , an LED light source 13 , and a diffusion plate 14 .
  • the LED light source 13 is located above the reflective film 12
  • the back plate 11 is located below the reflective film 12
  • the diffuser plate 14 is located at the LED light source. 13 above.
  • FIG. 2 is a schematic diagram of a dark region generated by a direct-lit LED backlight module in the prior art.
  • the arrowed lines at the edges of each of the LEDs in FIG. 2 indicate the edge rays emitted by the LEDs, and the area between the two edge rays of each LED is the light-emitting area of the LED.
  • the diffusion plate 14 is divided into a dark area 141 and an illumination area 142 according to the illumination conditions received on the diffusion plate 14.
  • the dark area 141 is not illuminated by the LED light source, and the light area 142 is illuminated by the light of the LED light source.
  • thinning is a development trend of a backlight module, and the thinning of the direct-lit LED backlight module, the distance between the diffusing plate and the LED light source is required. It is bound to become smaller and smaller, which will make the dark area problem of the direct-lit LED backlight module more obvious. It can be seen that overcoming the dark area problem of the direct-lit LED backlight module is an important technical problem in the application of the backlight module.
  • the purpose of the embodiment of the present application is to provide a direct-lit LED backlight module and a display including the same, which overcomes the dark area problem of the direct-lit LED backlight module and improves the picture quality of the direct-lit LED backlight module.
  • the embodiment of the present application provides a direct-lit LED backlight module, including a back plate, a reflective film, an LED light source, and a diffusing plate.
  • the LED light source is located above the reflective film
  • the back plate is located at the Below the reflective film
  • the diffuser plate is positioned above the LED light source and further includes a coating of reflective material on a localized portion of the lower surface of the diffuser plate.
  • the above-mentioned direct type LED backlight module may further have the following feature, the reflective material coating is located between a dark area of a lower surface of the diffusing plate and a diffusing plate area corresponding directly above the LED light source, the dark The area refers to an area on the lower surface of the diffuser plate that is covered by the light-emitting area of the LED light source.
  • the direct type LED backlight module may further have the following feature: the reflective material coating is a nano reflective material coating.
  • the above-mentioned direct type LED backlight module may further have the following characteristics, and the reflectance of the reflective material coating of the reflective material is in a range of 90% to 100%.
  • the direct type LED backlight module of the embodiment of the present application overcomes the direct type LED backlight module
  • the dark area problem improves the picture quality of the direct-lit LED backlight module and enhances the user experience.
  • an embodiment of the present application further provides a display, where the display includes a direct-lit LED backlight module, and the direct-lit LED backlight module includes a back plate, a reflective film, an LED light source, and a diffusion plate.
  • An LED light source is located above the reflective film
  • the back plate is located below the reflective film
  • the diffuser plate is located above the LED light source
  • the direct type LED backlight module further includes a portion located on a lower surface of the diffuser plate A reflective coating of the area.
  • the above display may further have a feature that the reflective material coating is located between a dark area of a lower surface of the diffusing plate and a corresponding diffusing plate area directly above the LED light source, and the dark area refers to the diffusion.
  • the dark area refers to the diffusion.
  • the above display may further have the following feature, the reflective material coating is a nano reflective material coating.
  • the above display may further have the following feature, the reflectivity of the reflective material coating of the reflective material is in the range of 90% to 100%.
  • the above display may also have the following features, the display being a television display or a computer display.
  • the display of the embodiment of the present application includes a direct-lit LED backlight module that overcomes the dark area problem, improves the picture quality of the display, and improves the user experience.
  • FIG. 1 is a schematic cross-sectional structural view of a direct-lit LED backlight module in the prior art.
  • FIG. 2 is a schematic diagram of a dark region generated by a direct-lit LED backlight module in the prior art.
  • FIG. 3 is a schematic structural view of a cross section of a direct type LED backlight module according to an embodiment of the present application.
  • FIG. 4 is a schematic diagram of a direct type LED backlight module overcoming a dark area problem according to an embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of a display in an embodiment of the present application.
  • FIG. 3 is a schematic structural view of a cross section of a direct type LED backlight module according to an embodiment of the present application.
  • the direct type LED backlight module includes a back plate 21, a reflective film 22, an LED light source 23, and a diffusion plate 24.
  • the LED light source 23 is located above the reflective film 22, the back plate 21 is located below the reflective film 22, and the diffuser plate 24 is located above the LED light source 23.
  • the direct type LED backlight module of this embodiment further includes a reflective material coating 25 located in a partial area of the lower surface of the diffusion plate.
  • FIG. 4 is a schematic diagram of a direct type LED backlight module overcoming a dark area problem according to an embodiment of the present application.
  • the four light rays emitted by the LED light source 23 are respectively indicated by a solid arrow line, a crossed arrow line, a dotted line arrow line, and a dotted line arrow line, and the light between the reflective film 22 and the diffusion plate 24 represents the LED light source.
  • the reflected light path of the emitted light of 23, the light above the diffusing plate 24 represents the transmitted light path of the light emitted by the LED light source 23. Referring to FIG.
  • the reflective material coating 25 is applied to a partial area of the lower surface of the diffuser, a part of the light emitted by the LED light source 23 is irradiated onto the reflective material coating 25. Due to the reflective property of the reflective material coating 25, the reflective material The coating 25 reflects these light rays onto the reflective film 22, which then reflects the light into the dark regions 241 of the diffuser panel 24. It can be seen that the reflective material coating 25 increases the light incident of the dark area 241 of the diffusion plate 24, so that the picture light is uniform, can effectively overcome the dark area problem, and improve the picture quality of the direct type LED backlight module.
  • the direct-lit LED backlight module of the embodiment of the present invention overcomes the dark area problem of the direct-lit LED backlight module, improves the picture quality of the direct-lit LED backlight module, and improves the user experience.
  • This embodiment further details the reflective material coating 25 in the embodiment shown in FIG.
  • the reflective material coating 25 may be located between the dark region 241 of the lower surface of the diffuser plate 24 and the region of the diffuser plate 24 corresponding directly above the LED light source 23, wherein the dark region refers to the LED light source on the lower surface of the diffuser plate.
  • the area outside the coverage of the illuminating area such as the dark area 141 in Fig. 2, the dark area 241 in Fig. 4.
  • the reflective material coating 25 may be a nano reflective material coating.
  • the intensity of light entering the dark region and directly transmitted from the reflective material coating 25 can be controlled by adjusting the reflectance of the reflective material of the reflective material coating 25. That is, the higher the reflectivity of the reflective material, the more light entering the dark region, and the less light is directly transmitted from the reflective material; conversely, the lower the reflectivity of the reflective material, the less light entering the dark region, and the light is directly transmitted from the reflective material. The more light there is.
  • the reflectivity of the reflective material can be adjusted according to the actual picture condition, thereby adjusting the effect of the dark area and the picture above the reflective material.
  • the reflectivity of the reflective material coating 25 can be adjusted in accordance with the light distribution.
  • the reflectivity of the reflective material coating 25 can be between 90% and 100%.
  • the direct-lit LED backlight module of the embodiment of the present invention overcomes the dark area problem of the direct-lit LED backlight module, improves the picture quality of the direct-lit LED backlight module, and improves the user experience.
  • FIG. 5 is a schematic structural diagram of a display in an embodiment of the present application.
  • the display includes a direct type LED backlight module.
  • the direct type LED backlight module can be the direct type LED backlight module in any of the foregoing embodiments of the present application.
  • the direct-type LED backlight module included in the display comprises a back plate, a reflective film, an LED light source and a diffusing plate, wherein the LED light source is located above the reflective film, the back plate is located below the reflective film, the diffusing plate is located above the LED light source, and the direct-lit LED
  • the backlight module also includes a coating of reflective material located in a localized area of the lower surface of the diffuser.
  • the reflective material coating may be located between the dark area of the lower surface of the diffusing plate and the diffusing plate area corresponding directly above the LED light source, wherein the dark area refers to the lower surface of the diffusing plate covered by the light emitting area of the LED light source. Outside the area.
  • the dark area 141 in the aforementioned FIG. 2 or the dark area 241 in the aforementioned FIG.
  • the coating of the reflective material increases the brightness of the screen by increasing the light in the dark area of the diffusing plate, thereby effectively overcoming the dark area problem and improving the picture quality of the direct-lit LED backlight module, thereby improving the picture quality of the display.
  • the principle of the reflective material coating by increasing the light incident in the dark area of the diffusing plate to make the picture light uniform, thereby overcoming the dark area problem see the schematic diagram shown in FIG. 4 and its description, and details are not described herein.
  • the reflective material coating may be a nano reflective material coating.
  • the intensity of light entering the dark zone and directly transmitted from the reflective material coating can be controlled by adjusting the reflectivity of the reflective material of the reflective material coating. That is, the more reflective material reflects High, the more light entering the dark zone, the less light is transmitted directly from the reflective material; conversely, the lower the reflectivity of the reflective material, the less light entering the dark zone, and the more light that is transmitted directly from the reflective material.
  • the reflectivity of the reflective material can be adjusted according to the actual picture condition, thereby adjusting the effect of the dark area and the picture above the reflective material.
  • the reflectivity of the reflective material coating can be adjusted in accordance with the light distribution.
  • the reflective material coating may have a reflectance between 90% and 100%.
  • the display may be a television display, a computer (also called a computer) display, or the like.
  • the computer display may be a stand-alone display of a desktop computer or a display of a notebook computer.
  • the direct-lit LED backlight module included in the display of the embodiment of the present invention overcomes the dark area problem of the direct-lit LED backlight module, and improves the picture quality of the direct-lit LED backlight module, thereby making the display of the embodiment of the present application
  • the picture quality has been significantly improved, improving the user experience.

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Abstract

一种直下式LED背光模组及包含该背光模组的显示器。其中，直下式LED背光模组包括背板（21）、反射膜（22）、LED光源（23）和扩散板（24），所述LED光源（23）位于所述反射膜（22）上方，所述背板（21）位于所述反射膜（22）下方，所述扩散板（24）位于所述LED光源（23）上方，还包括位于所述扩散板（24）下表面的局部区域的反射材料涂层（25）。所述直下式LED背光模组，克服了直下式LED背光模组的暗区（141，241）问题，提高了直下式LED背光模组的画面品质，提升了用户体验。

Description

一种直下式LED背光模组及包含该背光模组的显示器
交叉引用
本申请要求在2015年11月27日提交中国专利局、申请号为201520971155.X、发明名称为“一种直下式LED背光模组及包含该背光模组的显示器”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及光学领域，尤其涉及一种直下式LED背光模组及包含该背光模组的显示器。
背景技术
背光模组是位于LCD(Liquid Crystal Display，液晶显示器)背后的一种光源，它的发光效果将直接影响到LCM(Liquid Crystal Display Module，液晶显示模块)的视觉效果。液晶显示器本身并不发光，它显示图形或是它对光线调制的结果。
背光模组有直下式背光模组和侧入式背光模组两种。其中，直下式背光模组的光源安装在与屏幕平行的底板上，光线直接从底部射出。侧入式背光模组的光源安装在屏幕侧面的边框上，光线通过导光板折射后从屏幕射出。相比于侧入式背光模组，直下式背光模组的色域更好、图像效果更自然、屏幕亮度更均匀、屏幕漏光小，并且直下式背光模组能够提升对比度，实现动态智能背光，因而直下式背光模组具有更好的画面品质。
直下式LED(Light Emitting Diode，发光二极管)背光模组是应用广泛的一种直下式背光模组。图1为现有技术中直下式LED背光模组的横切面结构示意图。如图1所示，现有技术中，直下式LED背光模组包括背板11、反射膜12、LED光源13和扩散板14。其中，LED光源13位于反射膜12上方，背板11位于反射膜12下方，扩散板14位于LED光源 13上方。
由于直下式LED背光模组的LED发光角度有限，在相邻两个LED之间容易产生暗区，即扩散板上光线照射不到的地方。图2为现有技术中直下式LED背光模组产生暗区的原理图。如图2所示，图2中每个LED边缘处的带箭头线条表示该LED发出的边缘光线，每个LED的两条边缘光线之间的区域为该LED的发光区。图2中根据扩散板14上受到的光照情况将扩散板14分为暗区141和光照区142。暗区141没有受到LED光源的光照，光照区142有LED光源的光照射到。在实现本申请过程中，发明人发现现有技术中至少存在如下问题：薄型化是背光模组的发展趋势，要实现直下式LED背光模组的薄型化，扩散板与LED光源之间的距离势必越来越小，这将导致直下式LED背光模组的暗区问题更加明显。可见，克服直下式LED背光模组的暗区问题是背光模组应用中的重要技术问题。
发明内容
本申请实施例的目的在于提供一种直下式LED背光模组及包含该背光模组的显示器，克服直下式LED背光模组的暗区问题，提高直下式LED背光模组的画面品质。
为实现上述目的，本申请实施例提出了一种直下式LED背光模组，包括背板、反射膜、LED光源和扩散板，所述LED光源位于所述反射膜上方，所述背板位于所述反射膜下方，所述扩散板位于所述LED光源上方，还包括位于所述扩散板下表面的局部区域的反射材料涂层。
进一步地，上述直下式LED背光模组还可具有以下特点，所述反射材料涂层位于所述扩散板下表面的暗区与所述LED光源正上方对应的扩散板区域之间，所述暗区指所述扩散板下表面上被所述LED光源的发光区覆盖之外的区域。
进一步地，上述直下式LED背光模组还可具有以下特点，所述反射材料涂层为纳米反射材料涂层。
进一步地，上述直下式LED背光模组还可具有以下特点，所述反射材料涂层的反射材料的反射率处于90％至100％的区间。
本申请实施例的直下式LED背光模组，克服了直下式LED背光模组 的暗区问题，提高了直下式LED背光模组的画面品质，提升了用户体验。
为实现上述目的，本申请实施例还提出了一种显示器，所述显示器包括直下式LED背光模组，所述直下式LED背光模组包括背板、反射膜、LED光源和扩散板，所述LED光源位于所述反射膜上方，所述背板位于所述反射膜下方，所述扩散板位于所述LED光源上方，所述直下式LED背光模组还包括位于所述扩散板下表面的局部区域的反射材料涂层。
进一步地，上述显示器还可具有以下特点，所述反射材料涂层位于所述扩散板下表面的暗区与所述LED光源正上方对应的扩散板区域之间，所述暗区指所述扩散板下表面上被所述LED光源的发光区覆盖之外的区域。
进一步地，上述显示器还可具有以下特点，所述反射材料涂层为纳米反射材料涂层。
进一步地，上述显示器还可具有以下特点，所述反射材料涂层的反射材料的反射率处于90％至100％的区间。
进一步地，上述显示器还可具有以下特点，所述显示器为电视机显示器或计算机显示器。
本申请实施例的显示器包括的直下式LED背光模组克服了暗区问题，提高了显示器的画面品质，提升了用户体验。
附图说明
图1为现有技术中直下式LED背光模组的横切面结构示意图。
图2为现有技术中直下式LED背光模组产生暗区的原理图。
图3为本申请实施例中直下式LED背光模组的横切面结构示意图。
图4为本申请实施例中直下式LED背光模组克服暗区问题的原理图。
图5为本申请实施例中显示器的结构示意图。
具体实施方式
以下结合附图对本申请实施例的原理和特征进行描述，所举实施例只用于解释本申请，并非用于限定本申请的范围。对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，根据本申请精神所获得的所有实施 例，都属于本申请的保护范围。
实施例一
图3为本申请实施例中直下式LED背光模组的横切面结构示意图。如图3所示，本实施例中，直下式LED背光模组包括背板21、反射膜22、LED光源23和扩散板24。其中，LED光源23位于反射膜22上方，背板21位于反射膜22下方，扩散板24位于LED光源23上方。本实施例中的直下式LED背光模组还包括位于扩散板下表面的局部区域的反射材料涂层25。
图4为本申请实施例中直下式LED背光模组克服暗区问题的原理图。图4中，LED光源23发出的四条光线分别以实线箭头线、划线箭头线、点线箭头线和点划线箭头线表示，反射膜22与扩散板24之间的光线表示了LED光源23发出的光线的反射光路，扩散板24之上的光线表示了LED光源23发出的光线的透射光路。参见图4，在扩散板下表面的局部区域涂布反射材料涂层25后，LED光源23发出的一部分光线会照射到反射材料涂层25上，由于反射材料涂层25的反射特性，反射材料涂层25会将这些光线反射到反射膜22上，然后反射膜22再将光线反射到扩散板24的暗区241。可见，反射材料涂层25增加了扩散板24的暗区241的光线射入，使画面光线均匀，能够有效地克服暗区问题，提高直下式LED背光模组的画面品质。
可见，本申请实施例的直下式LED背光模组，克服了直下式LED背光模组的暗区问题，提高了直下式LED背光模组的画面品质，从而提升了用户体验。
实施例二
本实施例对图3所示实施例中的反射材料涂层25作进一步详细说明。
参见图3，反射材料涂层25可以位于扩散板24下表面的暗区241与LED光源23正上方对应的扩散板24的区域之间，其中，暗区指扩散板下表面上被LED光源的发光区覆盖之外的区域，例如图2中的暗区141，图4中的暗区241。
其中，反射材料涂层25可以是纳米反射材料涂层。
在本申请实施例中，可以通过调整反射材料涂层25的反射材料的反射率来控制进入暗区和从反射材料涂层25直接透射出的光线强度。即反射材料反射率越高，进入暗区的光线越多，从反射材料直接透射出的光线越少；反之，反射材料反射率越低，进入暗区的光线越少，从反射材料直接透射出的光线越多。在应用中可以针对实际画面情况来调整反射材料反射率，进而调整暗区及反射材料上方的画面效果。
在应用中，可以按照光分布情况调节反射材料涂层25的反射率。一般情况下，反射材料涂层25的反射率可以在90％至100％之间。
本申请实施例的直下式LED背光模组，克服了直下式LED背光模组的暗区问题，提高了直下式LED背光模组的画面品质，提升了用户体验。
实施例三
图5为本申请实施例中显示器的结构示意图。如图5所示，本实施例中，显示器中包括直下式LED背光模组。该直下式LED背光模组可以是本申请前述任一实施例中的直下式LED背光模组。
该显示器中包括的直下式LED背光模组包括背板、反射膜、LED光源和扩散板，其中，LED光源位于反射膜上方，背板位于反射膜下方，扩散板位于LED光源上方，直下式LED背光模组还包括位于扩散板下表面的局部区域的反射材料涂层。
在本申请实施例中，反射材料涂层可以位于扩散板下表面的暗区与LED光源正上方对应的扩散板区域之间，其中，暗区指扩散板下表面上被LED光源的发光区覆盖之外的区域。例如，前述图2中的暗区141，或者前述图4中的暗区241。
反射材料涂层通过增加扩散板的暗区的光线射入，使画面光线均匀，从而能够有效地克服暗区问题，提高直下式LED背光模组的画面品质，进而提高了显示器的画面品质。关于反射材料涂层通过增加扩散板的暗区的光线射入，使画面光线均匀，从而克服暗区问题的原理参见前述的图4所示的原理图及其说明，此处不再赘述。
在本申请实施例中，反射材料涂层可以为纳米反射材料涂层。
在应用中，可以通过调整反射材料涂层的反射材料的反射率来控制进入暗区和从反射材料涂层直接透射出的光线强度。即反射材料反射率越 高，进入暗区的光线越多，从反射材料直接透射出的光线越少；反之，反射材料反射率越低，进入暗区的光线越少，从反射材料直接透射出的光线越多。在应用中可以针对实际画面情况来调整反射材料反射率，进而调整暗区及反射材料上方的画面效果。具体地，在应用中，可以按照光分布情况调节反射材料涂层的反射率。一般情况下，反射材料涂层的反射率可以在90％至100％之间。
其中，显示器可以是电视机显示器、计算机(也称电脑)显示器等等。其中，计算机显示器可以是台式计算机的独立显示器，也可以是笔记本电脑的显示器。
本申请实施例的显示器中包括的直下式LED背光模组，克服了直下式LED背光模组的暗区问题，提高了直下式LED背光模组的画面品质，因而使得本申请实施例的显示器的画面品质得到了显著提高，提升了用户体验。
以上所述仅为本申请的较佳实施例，并不用以限制本申请，凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (9)

  1. 一种直下式LED背光模组，包括背板、反射膜、LED光源和扩散板，所述LED光源位于所述反射膜上方，所述背板位于所述反射膜下方，所述扩散板位于所述LED光源上方，其特征在于，还包括位于所述扩散板下表面的局部区域的反射材料涂层。
  2. 根据权利要求1所述的直下式LED背光模组，其特征在于，所述反射材料涂层位于所述扩散板下表面的暗区与所述LED光源正上方对应的扩散板区域之间，所述暗区指所述扩散板下表面上被所述LED光源的发光区覆盖之外的区域。
  3. 根据权利要求1所述的直下式LED背光模组，其特征在于，所述反射材料涂层为纳米反射材料涂层。
  4. 根据权利要求1所述的直下式LED背光模组，其特征在于，所述反射材料涂层的反射材料的反射率处于90％至100％的区间。
  5. 一种显示器，所述显示器包括直下式LED背光模组，其特征在于，所述直下式LED背光模组包括背板、反射膜、LED光源和扩散板，所述LED光源位于所述反射膜上方，所述背板位于所述反射膜下方，所述扩散板位于所述光源上方，所述直下式LED背光模组还包括位于所述扩散板下表面的局部区域的反射材料涂层。
  6. 根据权利要求5所述的显示器，其特征在于，所述反射材料涂层位于所述扩散板下表面的暗区与所述LED光源正上方对应的扩散板区域之间，所述暗区指所述扩散板下表面上被所述LED光源的发光区覆盖之外的区域。
  7. 根据权利要求5所述的显示器，其特征在于，所述反射材料涂层为纳米反射材料涂层。
  8. 根据权利要求5所述的显示器，其特征在于，所述反射材料涂层的反射材料的反射率处于90％至100％的区间。
  9. 根据权利要求5所述的显示器，其特征在于，所述显示器为电视机显示器或计算机显示器。
PCT/CN2016/084990 2015-11-27 2016-06-06 一种直下式led背光模组及包含该背光模组的显示器 WO2017088447A1 (zh)

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