WO2021243795A1 - 显示装置及背光模块 - Google Patents

显示装置及背光模块 Download PDF

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Publication number
WO2021243795A1
WO2021243795A1 PCT/CN2020/100399 CN2020100399W WO2021243795A1 WO 2021243795 A1 WO2021243795 A1 WO 2021243795A1 CN 2020100399 W CN2020100399 W CN 2020100399W WO 2021243795 A1 WO2021243795 A1 WO 2021243795A1
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WO
WIPO (PCT)
Prior art keywords
light
backlight module
ink layer
units
display device
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Application number
PCT/CN2020/100399
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English (en)
French (fr)
Inventor
付琳琳
李德华
张鑫
Original Assignee
Tcl华星光电技术有限公司
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Application filed by Tcl华星光电技术有限公司 filed Critical Tcl华星光电技术有限公司
Priority to US17/043,022 priority Critical patent/US11215875B2/en
Publication of WO2021243795A1 publication Critical patent/WO2021243795A1/zh

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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
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity

Definitions

  • the present invention relates to the field of display technology, in particular to a display device and a backlight module.
  • the backlight of the traditional low-end liquid crystal display turns on when the light is turned on, and turns off when the light is turned off.
  • the brightness adjustment of the final picture depends on the light shielding of the liquid crystal display layer.
  • the contrast can reach 5000:1 at most, and the visual effect of the picture displayed by this contrast is not good.
  • the traditional mid-range LCD display will also achieve tens to hundreds of partitions Local Dimming products can better improve a certain contrast, but because the number of partitions is limited by LED Pitch (light-emitting diode pitch), etc., the displayed display effect often has halo, which affects the viewing quality.
  • Mini LED Mini Light Emitting Diode (miniature light-emitting diode) technology was born, Mini LED products can be divided into thousands or even tens of thousands, and the contrast ratio can be increased to 1 million:1, to achieve the best light and dark contrast display, compared with traditional display products. A qualitative leap.
  • the current of the current Mini LED backlight module is injected through a single aspect.
  • voltage line loss IR Drop
  • Embodiments of the present invention provide a display device and a backlight module, which are used to alleviate the problem that the brightness of the backlight module near the power input side is higher than the brightness of the backlight module far away from the power input side, which causes uneven brightness display on the surface of the backlight module. .
  • the present invention provides a backlight module, including:
  • a substrate the substrate includes a first end and a second end that are oppositely arranged;
  • An ink layer is disposed on the substrate, and the ink layer includes a plurality of hollow cells gradually arranged from the first end to the second end;
  • a plurality of light-emitting units at least two of the light-emitting units are arranged in an array on the ink layer.
  • the number of the hollow units ranges from the first end to the second end.
  • the second end gradually decreases.
  • the interval between two adjacent hollowed-out units in the same row close to the first end is smaller than that of two adjacent hollowed out units in the same row far away from the first end. The interval between two adjacent hollowed-out units.
  • the area of any one of the hollow units is divided by the first end To the second end gradually decrease.
  • the ratio of the sum of the areas of the hollow units in the same row at the second end to the sum of the areas of the hollow units in the same row at the first end is between 0.05 and 0.3 .
  • the backlight module further includes:
  • the optical film is arranged on the light-emitting unit and used to transmit light emitted by the light-emitting unit.
  • the optical film includes a plurality of dot structures distributed in an array, and at least one light-emitting unit corresponds to the center of the dot structure distributed in an array.
  • the dot structure is composed of a plurality of protrusions, and at least two of the protrusions are arranged in an array.
  • the ink layer is formed by mixing white ink and metal oxide and then stirring.
  • the transmittance of the light near the first end of the ink layer is greater than the transmittance of the light far away from the first end.
  • the present invention also provides a display device including a backlight module, wherein the backlight module includes:
  • a substrate the substrate includes a first end and a second end that are oppositely arranged;
  • An ink layer is disposed on the substrate, and the ink layer includes a plurality of hollow cells gradually arranged from the first end to the second end;
  • a plurality of light-emitting units at least two of the light-emitting units are arranged in an array on the ink layer.
  • the number of the hollow cells ranges from the first end to the second end.
  • the second end gradually decreases.
  • the interval between two adjacent hollowed-out units in the same column close to the first end is smaller than that of the two adjacent hollowed out units in the same column far away from the first end. The interval between two adjacent hollowed-out units.
  • the area of any one of the hollow cells is divided by the first end To the second end gradually decrease.
  • the ratio of the sum of the areas of the hollow cells in the same row at the second end to the sum of the areas of the hollow cells in the same row at the first end is between 0.05 and 0.3 .
  • the backlight module further includes:
  • the optical film is arranged on the light-emitting unit and used to transmit light emitted by the light-emitting unit.
  • the optical film includes a plurality of dot structures distributed in an array, and at least one of the light-emitting units corresponds to the center of the dot structure distributed in the array.
  • the dot structure is composed of a plurality of protrusions, and at least two of the protrusions are arranged in an array.
  • the ink layer is formed by mixing white ink and metal oxide and then stirring.
  • the transmittance of the light near the first end of the ink layer is greater than the transmittance of the light far away from the first end.
  • the backlight module provided by the present invention is provided with an ink layer with gradually arranged hollow units on the substrate, so that the light emitted by the light-emitting unit and the light reflected by the optical film are partially absorbed by the hollow units. Since the hollow units are arranged gradually, In order to reduce the emissivity of light, the reflectivity of light at strong light is lower than the reflectivity of light at weak light, thereby improving the problem of uneven brightness display on the surface of the backlight module.
  • the present invention is provided with a white ink layer on the substrate. Because the ink layer has a high reflectivity, it can reflect the light emitted by the light-emitting unit to the optical film, and the ink layer can also reflect the optical film to the ink. The light of the layer is again reflected to the optical film, thereby improving the utilization rate of light. Furthermore, in the present invention, the ink layer is directly arranged on the substrate, which can replace the existing reflective sheet and save production cost.
  • the backlight module of the present invention also includes an optical film, by arranging a dot structure with different heights on the optical film.
  • the height of the protrusion is small, it is conducive to the diffusion of light; when the height of the protrusion away from the light-emitting unit is large, it is conducive to the concentration of light, so that the surface light source emits light uniformly.
  • FIG. 1 is a schematic structural diagram of a backlight module provided by an embodiment of the present invention
  • FIG. 2 is another schematic structural diagram of a backlight module provided by an embodiment of the present invention.
  • FIG. 3 is a schematic cross-sectional view of a backlight module provided by an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a display device provided by an embodiment of the present invention.
  • first and second are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with “first” and “second” may explicitly or implicitly include one or more of the features. In the description of the present application, "a plurality of" means two or more than two, unless otherwise specifically defined.
  • connection should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected or integrally connected; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components.
  • connection should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected or integrally connected; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components.
  • the backlight module 100 includes a substrate 10, an ink layer 20 and a plurality of light emitting units 30.
  • the substrate 10 includes a first end 10a and a second end 10b which are arranged oppositely.
  • the ink layer 20 is disposed on the substrate 10, and the ink layer 20 includes a plurality of hollow cells 201 gradually arranged from the first end 10a to the second end 10b.
  • At least two of the light-emitting units 30 are arranged in an array on the ink layer 20.
  • the substrate 10 is a glass substrate or a flexible substrate.
  • the light emitting unit 30 includes a Mini LED (Mini Light Emitting Diode, mini light emitting diode) light emitting unit.
  • the backlight module 100 includes a direct type Mini LED backlight module.
  • the substrate 10 at the hollow unit 201 in the embodiment of the present invention is exposed, that is, the hollow unit 201 is the upper surface of the substrate 10.
  • the shape of the hollow unit 201 is a circle or a square, but is not limited to this. For example, it can also be an ellipse, a honeycomb, or a triangle.
  • the ink layer 20 with the hollow unit 201 is formed by an inkjet printing process. Specifically, the CAD drawing file with the coordinates of the hollow unit 201 is imported into the software, and the inkjet printing device prints the ink layer with the hollow unit 201 according to the drawing file. In order to make the film thickness of the ink layer uniform, the ink layer 20 is formed through at least one inkjet printing process. In the present invention, the ink layer 20 with the hollow unit 201 is directly formed by the inkjet printing process, which not only can effectively improve the production efficiency, but also can save the production cost. In addition, the ink layer 20 with hollow cells 201 formed by inkjet printing has high reliability and stability.
  • the number of the hollow cells 201 is determined by the The first end 10a to the second end 10b gradually decrease. That is, the hollow density gradually decreases from the first end 10a to the second end 10b.
  • the interval d1 between two adjacent hollowed-out units 201 in the same row close to the first end 10a is smaller than that between two adjacent hollowed-out units 201 in the same row far away from the first end 10a.
  • hollow cells 201 are evenly arranged.
  • the area of any one of the hollow cells 201 is determined by The first end 10a to the second end 10b gradually decrease. That is, in any row of hollowed-out units 201 in the direction perpendicular to the direction from the first end 10a to the second end 10b, while keeping the number of hollowed-out units 201 in each row unchanged, the area of any hollowed-out unit 201 is increased by The one end 10a to the second end 10b gradually decrease.
  • the ratio of the total area of the hollowed-out units 201 in the same row at the second end 10b to the total area of the hollowed-out units 201 in the same row at the first end 10a is between 0.05 and 0.3.
  • the ratio of the total area of the hollow cells 201 in the same row at the second end 10b to the total area of the hollow cells 201 in the same row at the first end 10a is any one of 0.05, 0.1, 0.15, 0.2, 0.25, and 0.30. . That is, the ratio of the total area of the hollow cells 201 at the second end 10b where the light is weak to the total area of the hollow cells 201 at the first end 10a where the light is strong is between 0.05 and 0.3.
  • the same row of hollowed-out cells 201 at the first end 10a in the embodiment of the present invention refers to the same row of hollowed-out cells 201 closest to the first end, that is, the area with the largest total area of the hollowed-out cells 201.
  • the hollowed-out cells 201 in the same row at the two ends 10b refer to the hollowed-out cells 201 in the same row closest to the second end, that is, the area where the total area of the hollowed-out cells 201 is the smallest.
  • the backlight module 100 in the embodiment of the present invention further includes an optical film 40, the optical film 40 is disposed on the light-emitting unit 30, and is used to transmit light emitted from the light-emitting unit 30.
  • the optical film 40 includes a plurality of dot structures 401 distributed in an array, and at least one light-emitting unit 30 corresponds to the center of the dot structure 401 distributed in an array.
  • the dot structure 401 is arranged on the side of the optical film 40 away from the light-emitting unit 30.
  • the dot structure 401 is used to diffuse the light of the light emitting unit 30.
  • the shape of the dot structure 401 includes a cone, a sphere, and the like.
  • the dot structure 401 is composed of a plurality of protrusions 4011, and at least two of the protrusions 4011 are arranged in an array.
  • the height of the protrusion 4011 close to the light-emitting unit 30 in the embodiment of the present invention is smaller than the height of the protrusion 4011 far away from the light-emitting unit 30.
  • the height of the protrusion 4011 is small, it is good for light diffusion; the light intensity far away from the light-emitting unit 30 is small, and when the height of the protrusion 4011 is large, it is good for light gathering, so that the surface light source emits light uniformly.
  • the optical film is made of light-transmitting materials, specifically, including glass, polymethyl methacrylate and polycarbonate.
  • a convex lens is provided on a side of the optical film 40 close to the light-emitting unit 30 for collecting the light emitted by the light-emitting unit 30.
  • the ratio of T1 to T2 is between 1 and 2 (not including 1).
  • the ratio of T1 to T2 is between 1 and 1.1 (not including 1).
  • the ratio of T1 to T2 is 1.01 Any one of, 1.02, 1.03, 1.04, 1.05, 1.06, 1.07, 1.08, 1.09, 1.1.
  • the light intensity received by the first area A is N% stronger than the light received by the second area B, and the hollow area of the first area A is greater than that of the second area.
  • the hollow area of area B is N% larger. It should be noted that the light intensity received by the first area A is greater than the light received by the second area B by N%, which is at least one of the light emitted by the light-emitting unit 30 and the reflected light of the optical film 40.
  • the value range of N% is determined according to the actual light emission of the backlight module 100.
  • the substrate 10 at the hollow unit 201 is directly exposed, so that the hollow density is greater in places where light is stronger than where light is weak, thereby reducing reflection of light, thereby realizing uniform light emission in the surface of the backlight module.
  • the ink layer 20 is formed by mixing white ink and metal oxide and then stirring, where the metal oxide is titanium dioxide (titanium dioxide) or aluminum oxide.
  • the ink layer 20 has a high reflectivity, and can reflect the light emitted by the light-emitting unit 30 to the optical film 40, and the ink layer 20 can also reflect the light from the optical film 40 to the ink layer 20 to the optical film again On the sheet 40, thereby improving the utilization of light.
  • the ink layer 20 is directly disposed on the substrate 10, which can replace the existing reflective sheet and save production cost.
  • the backlight module 100 in the embodiment of the present invention further includes a driving circuit, wherein the first terminal 10a is disposed at the driving terminal of the driving circuit.
  • an embodiment of the present invention also provides a display device.
  • the display device 200 includes the above-mentioned backlight module 100.
  • the description of the backlight module 100 in the display device 200 is as above, and will not be repeated here.
  • the display device in the embodiment of the present invention may be any component with a backlight module 100 such as electronic paper, mobile phone, tablet computer, television, display, notebook computer, digital photo frame, or navigator.
  • a backlight module 100 such as electronic paper, mobile phone, tablet computer, television, display, notebook computer, digital photo frame, or navigator.
  • the backlight module provided by the present invention is provided with an ink layer with gradually arranged hollow units on the substrate, so that the light emitted by the light-emitting unit and the light reflected by the optical film are partially absorbed by the hollow units.
  • the hollow units are arranged gradually, In order to reduce the emissivity of light, make the reflectance of light at strong light less than the reflectivity of light at weak light, so as to improve the backlight caused by the brightness of the backlight module near the power input side is higher than the brightness of the backlight module far away from the power input side The problem of uneven brightness display on the module surface.
  • the present invention is provided with a white ink layer on the substrate. Because the ink layer has a high reflectivity, it can reflect the light emitted by the light-emitting unit to the optical film, and the ink layer can also reflect the optical film to the ink. The light of the layer is again reflected to the optical film, thereby improving the utilization rate of light. Furthermore, in the present invention, the ink layer is directly arranged on the substrate, which can replace the existing reflective sheet and save production cost.
  • the backlight module of the present invention also includes an optical film, by arranging a dot structure with different heights on the optical film.
  • the height of the protrusion is small, it is conducive to the diffusion of light; when the height of the protrusion away from the light-emitting unit is large, it is conducive to the concentration of light, so that the surface light source emits light uniformly.

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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

本发明公开了一种显示装置及背光模块，所述背光模块包括：基板、油墨层及多个发光单元，其中，所述基板包括相对设置的第一端和第二端；所述油墨层设置在所述基板上，所述油墨层包括由所述第一端至所述第二端渐变排布的多个镂空单元；至少两个所述发光单元在所述油墨层上阵列排布。

Description

显示装置及背光模块 技术领域
本发明涉及显示技术领域，尤其涉及一种显示装置及背光模块。
 背景技术
传统的低端液晶显示器的背光开灯即亮，关灯即灭，最终画面的亮暗调节依赖于液晶显示层对光线的遮挡。但是，因受制于各种实际工艺，材料等等局限，其对比度最多能达到5000：1，这种对比度显示出来的画面的视觉效果不佳。传统的中端的液晶显示器也会做到几十至几百分区Local Dimming产品，可以较佳的提高一定的对比度，但是由于其分区数受LED Pitch（发光二极管的间距）等限制，呈现的显示效果经常会有光晕情况出现，影响了观看的画质。
所以，Mini LED（Mini Light Emitting Diode，微型发光二极管）技术孕育而生，Mini LED产品可以将分区做到几千甚至上万，把对比度提高到100万：1，实现最佳的明暗对比度显示，与传统显示器产品相比有了质的飞跃。
目前的Mini LED背光模块的电流是通过单一方面灌入的，随着走线距离的增多，会产生电压线损（IR Drop），使得近入电侧的背光模块的亮度高于远离入电侧背光模块的亮度，从而造成背光模块面内的亮度显示不均的问题。
故，有必要提出一种新的技术方案，以解决上述技术问题。
 技术问题
本发明实施例提供一种显示装置及背光模块，用于改善由于近入电侧的背光模块的亮度高于远离入电侧的背光模块的亮度而造成背光模块面内的亮度显示不均的问题。
 技术解决方案
本发明提供一种背光模块，包括：
基板，所述基板包括相对设置的第一端和第二端；
油墨层，所述油墨层设置在所述基板上，所述油墨层包括由所述第一端至所述第二端渐变排布的多个镂空单元；
多个发光单元，至少两个所述发光单元在所述油墨层上阵列排布。
在本发明提供的背光模块中，在与从所述第一端指向所述第二端的方向垂直的方向上的一列所述镂空单元中，所述镂空单元的数量由所述第一端至所述第二端逐渐减少。
在本发明提供的背光模块中，在相邻两列所述镂空单元中，靠近所述第一端的同一列两个相邻所述镂空单元的间隔小于远离所述第一端的同一列两个相邻所述镂空单元的间隔。
在本发明提供的背光模块中，在与从所述第一端指向所述第二端的方向垂直的方向上的一列所述镂空单元中，任意一个所述镂空单元的面积由所述第一端至所述第二端逐渐减小。
在本发明提供的背光模块中，所述第二端的同一列所述镂空单元的面积的总和与所述第一端的同一列所述镂空单元的面积的总和的比值介于0.05至0.3之间。
在本发明提供的背光模块中，所述背光模块还包括：
光学膜片，所述光学膜片设置在所述发光单元上，用于透过所述发光单元发出的光线。
在本发明提供的背光模块中，所述光学膜片上包括多个阵列分布的网点结构，至少一个所述发光单元对应于所述阵列分布网点结构的中心。
在本发明提供的背光模块中，所述网点结构由多个凸起组成，至少两个所述凸起阵列排布。
在本发明提供的背光模块中，所述油墨层由白色油墨和金属氧化物混合后搅拌形成。
在本发明提供的背光模块中，所述油墨层靠近所述第一端的光的透过率大于远离所述第一端的光的透过率。
本发明还提供一种显示装置，包括背光模块，其中，所述背光模块包括：
基板，所述基板包括相对设置的第一端和第二端；
油墨层，所述油墨层设置在所述基板上，所述油墨层包括由所述第一端至所述第二端渐变排布的多个镂空单元；
多个发光单元，至少两个所述发光单元在所述油墨层上阵列排布。
在本发明提供的显示装置中，在与从所述第一端指向所述第二端的方向垂直的方向上的一列所述镂空单元中，所述镂空单元的数量由所述第一端至所述第二端逐渐减少。
在本发明提供的显示装置中，在相邻两列所述镂空单元中，靠近所述第一端的同一列两个相邻所述镂空单元的间隔小于远离所述第一端的同一列两个相邻所述镂空单元的间隔。
在本发明提供的显示装置中，在与从所述第一端指向所述第二端的方向垂直的方向上的一列所述镂空单元中，任意一个所述镂空单元的面积由所述第一端至所述第二端逐渐减小。
在本发明提供的显示装置中，所述第二端的同一列所述镂空单元的面积的总和与所述第一端的同一列所述镂空单元的面积的总和的比值介于0.05至0.3之间。
在本发明提供的显示装置中，所述背光模块还包括：
光学膜片，所述光学膜片设置在所述发光单元上，用于透过所述发光单元发出的光线。
在本发明提供的显示装置中，所述光学膜片上包括多个阵列分布的网点结构，至少一个所述发光单元对应于所述阵列分布网点结构的中心。
在本发明提供的显示装置中，所述网点结构由多个凸起组成，至少两个所述凸起阵列排布。
在本发明提供的显示装置中，所述油墨层由白色油墨和金属氧化物混合后搅拌形成。
在本发明提供的显示装置中，所述油墨层靠近所述第一端的光的透过率大于远离所述第一端的光的透过率。
 有益效果
由于Mini LED背光模块的电流是从单一方向接入的，随着走线距离的增多，会产生电压线损（IR Drop），使得近入电侧的背光模块的亮度高于远离入电侧的背光模块的亮度，导致背光模块10的背光模块面内的亮度显示不均。本发明提供的背光模块通过在基板上设置具有渐变排布的镂空单元的油墨层，使得发光单元发出的光和光学膜片反射的光部分被镂空单元吸收，由于镂空单元呈渐变排布，用于减少光的发射率，使得光强处光的反射率小于光弱处光的反射率，从而改善背光模块面内的亮度显示不均的问题。
另外，本发明在基板上设置白色的油墨层，由于油墨层具有较高的反射率，能够将发光单元发出的光反射至光学膜片上，以及，油墨层还可以将光学膜片反射至油墨层的光再次反射至光学膜片上，从而提高光的利用率。再者，本发明将油墨层直接设置在基板上，可以替代现有的反射片，并且节约生产成本。
最后，本发明的背光模块还包括光学膜片，通过在光学膜片上设置具有高度不同的凸起的网点结构。当凸起的高度较小时，利于光的扩散；远离发光单当凸起的高度较大时，利于光的聚集，从而显示面光源均匀出光。
 附图说明
图1为本发明实施例提供背光模块的结构示意图；
图2为本发明实施例提供背光模块的另一结构示意图；
图3为本发明实施例提供的背光模块的剖面示意图；
图4为本发明实施例提供的显示装置的示意图。
 本发明的实施方式
为了使本发明的目的、技术方案和优点更加清楚，下面将结合附图对本发明作进一步地详细描述，请参照附图中的图式，其中相同的组件符号代表相同的组件，以下的说明是基于所示的本发明具体实施例，其不应被视为限制本发明未在此详述的其他具体实施例。本说明书所使用的词语“实施例”意指实例、示例或例证。
在本申请的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“顺时针”、“逆时针”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个所述特征。在本申请的描述中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。
在本申请的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本申请中的具体含义。
请参考图1或图2，本发明实施例提供一种背光模块，背光模块100包括基板10、油墨层20和多个发光单元30。其中，所述基板10包括相对设置的第一端10a和第二端10b。所述油墨层20设置在所述基板10上，所述油墨层20包括由所述第一端10a至所述第二端10b渐变排布的多个镂空单元201。至少两个所述发光单元30在所述油墨层20上阵列排布。其中，基板10为玻璃基板或柔性基板。发光单元30包括Mini LED（Mini Light Emitting Diode，微型发光二极管）发光单元。其中，背光模块100包括直下式Mini LED背光模块。
需要说明的是，本发明实施例中的镂空单元201处的基板10是裸露的，即镂空单元201处为基板10的上表面。镂空单元201的形状为圆形或方形，但并不限于此，比如还可以为椭圆形，蜂巢形或三角形等。
具有镂空单元201的油墨层20是通过喷墨打印工艺形成的。具体的，将具有镂空单元201的坐标的CAD图档导入软件，喷墨打印设备根据图档打印出具有镂空单元201的油墨层。为了使油墨层的膜层厚度均一，油墨层20通过至少一次喷墨打印工艺形成。本发明中具有镂空单元201的油墨层20通过喷墨打印工艺直接形成，不仅可以有效提高制作效率，还可以节约生产成本。另外，通过喷墨打印形成的具有镂空单元201的油墨层20具有较高的可靠性和稳定性。
进一步的，请继续参考图1，在与从所述第一端10a指向所述第二端10b的方向垂直的方向上的一列所述镂空单元中201，所述镂空单元201的数量由所述第一端10a至所述第二端10b逐渐减少。即，镂空密度由第一端10a至第二端10b逐渐减小。
更进一步的，在相邻两列所述镂空单元201中，靠近所述第一端10a的同一列两个相邻所述镂空单元201的间隔d1小于远离所述第一端10a的同一列两个相邻所述镂空单元201的间隔d2。在任意一列镂空单元201中，镂空单元201呈均匀排布。
可选的，请参考图2，在与从所述第一端10a指向所述第二端10b的方向垂直的方向上的一列所述镂空单元中201，任意一个所述镂空单元201的面积由所述第一端10a至所述第二端10b逐渐减小。即，第一端10a指向第二端10b的方向的垂直的方向上的任意一列镂空单元201中，在保持每列镂空单元201的数目不变的情况下，任意一个镂空单元201的面积由第一端10a至第二端10b逐渐减小。
进一步的，所述第二端10b的同一列所述镂空单元201的面积的总和与所述第一端10a的同一列所述镂空单元201的面积的总和的比值介于0.05至0.3之间。例如，第二端10b的同一列镂空单元201的面积的总和与第一端10a的同一列镂空单元201的面积的总和的比值为0.05、0.1、0.15、0.2、0.25、0.30中的任意一者。即，在出光弱的第二端10b处的镂空单元201的面积总和与光强的第一端10a处的镂空单元201的面积总和的比值介于0.05至0.3之间。需要说明的是，本发明实施例中的第一端10a的同一列镂空单元201指的是最靠近第一端的同一列镂空单元201，即具有镂空单元201的面积的总和最大的区域，第二端10b的同一列镂空单元201指的是最靠近第二端的同一列镂空单元201，即具有镂空单元201的面积的总和最小的区域。
进一步的，请参考图3，本发明实施例中的背光模块100还包括光学膜片40，所述光学膜片40设置在所述发光单元30上，用于透过所述发光单元30发出的光线。其中，所述光学膜片40上包括多个阵列分布的网点结构401，至少一个所述发光单元30对应于所述阵列分布网点结构401的中心。其中，网点结构401设置在光学膜片40远离发光单元30的一侧。网点结构401用于扩散发光单元30的光。网点结构401的形状包括锥体，球体等。
进一步的，请继续参考图3，所述网点结构401由多个凸起4011组成，至少两个所述凸起4011阵列排布。需要说明的是，本发明实施例中的靠近发光单元30的凸起4011的高度小于远离发光单元30的凸起4011的高度，其作用是，由于靠近发光单元30处光线强度较大，当凸起4011的高度较小时，利于光的扩散；远离发光单元30处光线强度较小，当凸起4011的高度较大时，利于光的聚集，从而显示面光源均匀出光。光学膜片由透光材料制成，具体的，包括玻璃、聚甲基丙烯酸甲酯和聚碳酸酯等。可选的，光学膜片40靠近发光单元30的一面设置有凸透镜，用于聚集发光单元30发光的光。
需要说明的是，请继续参考图1或图2，在具有镂空单元201的油墨层20上，任意相邻第一区域A的光的透过率T1大于第二区域B的光的透过率T2。即靠近第一端10a的第一区域A光的透过率T1大于远离第一端10a的第二区域B的光的透过率。其中，T1与T2的比值介于1至2之间（不包括1），优选的，T1与T2的比值介于1至1.1之间（不包括1），例如，T1与T2的比值为1.01、1.02、1.03、1.04、1.05、1.06、1.07、1.08、1.09、1.1中的任意一者。进一步的，在任意一第一区域A和第二区域B上，第一区域A接收到的光强比第二区域B接收到的光强大N%，则第一区域A的镂空面积比第二区域B的镂空面积大N%。需要说明的是，第一区域A接收到的光强比第二区域B接收到的光强大N%为由发光单元30发出的光及光学膜片40的反射光中的至少一者。其中N%的取值范围根据背光模块100的实际发光而定。
由于Mini LED背光模块的电流是从单一方面接入的，随着走线距离的增多，会产生电压线损（IR Drop），使得近入电侧的背光模块的亮度高于远离入电侧的背光模块的亮度，导致背光模块10的背光模块面内的亮度显示不均。本发明将镂空单元201处的基板10直接裸露，使得镂空密度在光较强处大于光较弱处，从而减少对光线的反射，从而实现背光模块面内均匀出光。
在本发明实施例中，所述油墨层20由白色油墨和金属氧化物混合后搅拌形成，其中，金属氧化物为二氧化钛（钛白粉）或氧化铝等。油墨层20具有较高的反射率，能够将发光单元30发出的光反射至光学膜片40上，以及，油墨层20还可以将光学膜片40反射至油墨层20的光再次发射至光学膜片40上，从而提高光的利用率。另外，本发明将油墨层20直接设置在基板10上，可以替代现有的反射片，并且节约生产成本。
需要说明的是，本发明实施例中的背光模块100还包括驱动电路，其中，第一端10a设置于驱动电路的驱动端。
请参考图4，本发明实施例还提供一种显示装置，显示装置200包括上述背光模块100。
对该显示装置200中背光模块100的描述如上，在此不再赘述。
需要说明的，本发明实施例中的显示装置可以为电子纸、手机、平板电脑、电视机、显示器、笔记本电脑、数码相框或导航仪等任何具有背光模块100的部件。
由于Mini LED背光模块的电流是从单一方面接入的，随着走线距离的增多，会产生电压线损（IR Drop），使得近入电侧的背光模块的亮度高于远离入电侧的背光模块的亮度，导致背光模块10的背光模块面内的亮度显示不均。本发明提供的背光模块通过在基板上设置具有渐变排布的镂空单元的油墨层，使得发光单元发出的光和光学膜片反射的光部分被镂空单元吸收，由于镂空单元呈渐变排布，用于减少光的发射率，使得光强处光的反射率小于光弱处光的反射率，从而改善由于近入电侧的背光模块的亮度高于远离入电侧的背光模块的亮度而造成背光模块面内的亮度显示不均的问题。
另外，本发明在基板上设置白色的油墨层，由于油墨层具有较高的反射率，能够将发光单元发出的光反射至光学膜片上，以及，油墨层还可以将光学膜片反射至油墨层的光再次反射至光学膜片上，从而提高光的利用率。再者，本发明将油墨层直接设置在基板上，可以替代现有的反射片，并且节约生产成本。
最后，本发明的背光模块还包括光学膜片，通过在光学膜片上设置具有高度不同的凸起的网点结构。当凸起的高度较小时，利于光的扩散；远离发光单当凸起的高度较大时，利于光的聚集，从而显示面光源均匀出光。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。

Claims (20)

  1. 一种背光模块，其中，包括：
    基板，所述基板包括相对设置的第一端和第二端；
    油墨层，所述油墨层设置在所述基板上，所述油墨层包括由所述第一端至所述第二端渐变排布的多个镂空单元；
    多个发光单元，至少两个所述发光单元在所述油墨层上阵列排布。
  2. 根据权利要求1所述的背光模块，其中，在与从所述第一端指向所述第二端的方向垂直的方向上的一列所述镂空单元中，所述镂空单元的数量由所述第一端至所述第二端逐渐减少。
  3. 根据权利要求2所述的背光模块，其中，在相邻两列所述镂空单元中，靠近所述第一端的同一列两个相邻所述镂空单元的间隔小于远离所述第一端的同一列两个相邻所述镂空单元的间隔。
  4. 根据权利要求1所述的背光模块，其中，在与从所述第一端指向所述第二端的方向垂直的方向上的一列所述镂空单元中，任意一个所述镂空单元的面积由所述第一端至所述第二端逐渐减小。
  5. 根据权利要求1所述的背光模块，其中，所述第二端的同一列所述镂空单元的面积的总和与所述第一端的同一列所述镂空单元的面积的总和的比值介于0.05至0.3之间。
  6. 根据权利要求1所述的背光模块，其中，所述背光模块还包括：
    光学膜片，所述光学膜片设置在所述发光单元上，用于透过所述发光单元发出的光线。
  7. 根据权利要求6所述的背光模块，其中，所述光学膜片上包括多个阵列分布的网点结构，至少一个所述发光单元对应于所述阵列分布网点结构的中心。
  8. 根据权利要求7所述的背光模块，其中，所述网点结构由多个凸起组成，至少两个所述凸起阵列排布。
  9. 根据权利要求1所述的背光模块，其中，所述油墨层由白色油墨和金属氧化物混合后搅拌形成。
  10. 根据权利要求1所述的背光模块，其中，所述油墨层靠近所述第一端的光的透过率大于远离所述第一端的光的透过率。
  11. 一种显示装置，其中，包括背光模块，其中，所述背光模块包括：
    基板，所述基板包括相对设置的第一端和第二端；
    油墨层，所述油墨层设置在所述基板上，所述油墨层包括由所述第一端至所述第二端渐变排布的多个镂空单元；
    多个发光单元，至少两个所述发光单元在所述油墨层上阵列排布。
  12. 根据权利要求11所述的显示装置，其中，在与从所述第一端指向所述第二端的方向垂直的方向上的一列所述镂空单元中，所述镂空单元的数量由所述第一端至所述第二端逐渐减少。
  13. 根据权利要求12所述的显示装置，其中，在相邻两列所述镂空单元中，靠近所述第一端的同一列两个相邻所述镂空单元的间隔小于远离所述第一端的同一列两个相邻所述镂空单元的间隔。
  14. 根据权利要求11所述的显示装置，其中，在与从所述第一端指向所述第二端的方向垂直的方向上的一列所述镂空单元中，任意一个所述镂空单元的面积由所述第一端至所述第二端逐渐减小。
  15. 根据权利要求11所述的显示装置，其中，所述第二端的同一列所述镂空单元的面积的总和与所述第一端的同一列所述镂空单元的面积的总和的比值介于0.05至0.3之间。
  16. 根据权利要求11所述的显示装置，其中，所述背光模块还包括：
    光学膜片，所述光学膜片设置在所述发光单元上，用于透过所述发光单元发出的光线。
  17. 根据权利要求16所述的显示装置，其中，所述光学膜片上包括多个阵列分布的网点结构，至少一个所述发光单元对应于所述阵列分布网点结构的中心。
  18. 根据权利要求17所述的显示装置，其中，所述网点结构由多个凸起组成，至少两个所述凸起阵列排布。
  19. 根据权利要求11所述的显示装置，其中，所述油墨层由白色油墨和金属氧化物混合后搅拌形成。
  20. 根据权利要求11所述的显示装置，其中，所述油墨层靠近所述第一端的光的透过率大于远离所述第一端的光的透过率。
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