WO2022077547A1 - 背光模组及显示装置 - Google Patents

背光模组及显示装置 Download PDF

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Publication number
WO2022077547A1
WO2022077547A1 PCT/CN2020/123174 CN2020123174W WO2022077547A1 WO 2022077547 A1 WO2022077547 A1 WO 2022077547A1 CN 2020123174 W CN2020123174 W CN 2020123174W WO 2022077547 A1 WO2022077547 A1 WO 2022077547A1
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WIPO (PCT)
Prior art keywords
led lamp
signal line
backlight module
lamp beads
substrate layer
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PCT/CN2020/123174
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English (en)
French (fr)
Inventor
李利霞
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Tcl华星光电技术有限公司
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Priority to US17/251,346 priority Critical patent/US11762234B2/en
Publication of WO2022077547A1 publication Critical patent/WO2022077547A1/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
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133612—Electrical details
    • 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
    • G02F1/133613—Direct backlight characterized by the sequence of light sources

Definitions

  • the invention relates to the field of display devices, in particular to a backlight module and a display device.
  • liquid crystal display devices such as Liquid Crystal Display (LCD) are widely used in mobile phones, TVs, Various consumer electronic products such as personal digital assistants, digital cameras, notebook computers, and desktop computers have become the mainstream of display devices.
  • Most of the liquid crystal display devices on the current market are backlight type liquid crystal display devices, which include a liquid crystal display panel and a backlight module.
  • the working principle of the liquid crystal display panel is to place liquid crystal molecules in two parallel glass substrates, and there are many vertical and horizontal thin wires between the two glass substrates. refracted to produce a picture. Since the liquid crystal display panel itself does not emit light, the light source provided by the backlight module needs to be used to display images normally. Therefore, the backlight module has become one of the key components of the liquid crystal display device.
  • the backlight modules are classified into two types: edge-lit backlight modules and direct-lit backlight modules according to the different incident positions of the light sources.
  • the direct type backlight module is provided with a plurality of LED lamp beads 11, and signal lines pass between the LED lamp beads 11. 12 is electrically connected. Due to the existence of resistance in the signal line 12, the problem of IR Drop occurs, which in turn makes the overall brightness of the backlight module uneven, which affects the display effect of the display device.
  • the purpose of the present invention is to provide a backlight module and a display device to solve the problem of uneven brightness of the backlight module in the prior art.
  • the present invention provides a backlight module, which includes a substrate layer and LED light bars equidistantly arranged on the substrate layer.
  • the LED light bar includes a signal line and a plurality of LED light beads.
  • the signal lines extend from one side of the substrate layer to the corresponding other side.
  • the LED lamp beads are arranged on the signal line and are electrically connected with the signal line. Wherein, from the low-level end of the signal line to the high-level end of the signal line, the distribution density of the LED lamp beads gradually decreases.
  • the distance between two adjacent LED light beads is less than 100 microns.
  • the distance between the nth LED lamp bead and the n+1th LED lamp bead close to the low-level end of the signal line is smaller than the distance between it and the high-level near the signal line.
  • the size of the LED lamp beads is less than 300 microns.
  • the backlight module further includes a chip-on film, and the chip-on film is disposed on one side of the substrate layer and connected to the high-level end of the signal line.
  • the backlight module further includes an array substrate, the array substrate is arranged on a surface of the substrate layer, and the LED light bar is arranged on a surface of the array substrate away from the substrate layer.
  • control circuit is provided in the chip-on-film, and the control circuit is connected to the signal line.
  • the LED lamp beads are at least one of white light LED lamp beads, red light LED lamp beads, green light LED lamp beads and blue light LED lamp beads.
  • the present invention also provides a display device, which includes the above-mentioned backlight module.
  • the advantages of the present invention are: in the backlight module and the display device provided by the present invention, by increasing the number of LED lamp beads at the low level of the signal line, the overall brightness here is increased, thereby solving the problem of voltage drop. However, the problem of uniform luminous brightness occurs, which improves the brightness uniformity of the backlight module and also improves the display effect of the display device.
  • FIG. 1 is a schematic diagram of the distribution of LED lamp beads of a backlight module in the prior art
  • FIG. 2 is a schematic diagram of a layered structure of a backlight module according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of the distribution of LED lamp beads in a backlight module according to an embodiment of the present invention.
  • Chip on film 40 Chip on film 40 .
  • An embodiment of the present invention provides a display device, which has a liquid crystal display panel, and the liquid crystal display panel is used to provide a display image for the display device.
  • the display device can be any display device with a display function, such as a mobile phone, a notebook computer, a TV set, and the like. Since the liquid crystal layer in the liquid crystal display panel does not have a self-luminous function, the liquid crystal display panel also has a backlight module 1 for providing a backlight source for the liquid crystal display panel.
  • the backlight module 1 is a direct type backlight, which has a substrate layer 30 , a chip on film 40 , a plurality of LED light bars 10 and an array substrate 20 .
  • the array substrate 20 is disposed on a surface of the substrate layer 30 , and a plurality of thin film transistors are arranged in the array substrate 20 . closure.
  • the chip on film 40 is disposed on one side of the substrate layer 30 .
  • a control circuit is provided in the chip on film 40 , the array substrate 20 and the LED light bar 10 are both connected to the control circuit, and the control circuit is used for sending a control signal to control each LED light bar 10 The brightness of the LED lamp beads 11.
  • the LED light bars 10 are arranged on a surface of the array substrate 20 away from the substrate layer 30 , the distance between every two adjacent LED light bars 10 is equal, and the two adjacent LED light bars 10 are equally spaced.
  • the distance between them is less than 100 microns, preferably the distance between them is less than 50 microns.
  • a plurality of LED lamp beads 11 are installed on the LED light bar 10 , and the LED light beads 11 are arranged on the LED light bar 10 in a line shape.
  • the LED lamp beads 11 are Mini-LEDs with a size of less than 300 microns.
  • a plurality of LED light bars 10 are arranged in the backlight module 1, and the LED light beads 11 in each LED light bar 10 emit light to provide a backlight source for the display device.
  • the backlight source is generally white light, which can be formed by direct light emission of white LED lamp beads, or white light can be formed by combining red LED lamp beads, green LED lamp beads and blue LED lamp beads to emit light.
  • the distance between two adjacent LED lamp beads 11 is less than 100 microns, and the density of the LED lamp beads 11 on the LED light bar 10 is not the same, the distribution density of the LED lamp beads 11 is from the One end of the LED light bar 10 gradually decreases toward the other end.
  • the LED light bar 10 also has a signal line 12 .
  • the signal line 12 extends from the side of the array substrate 20 close to the chip on film 40 to the side of the array substrate 20 away from the chip on film 40 . side.
  • One end of the signal line 12 is connected to the control circuit in the chip-on-film 40 , and is sequentially connected to each LED lamp bead 11 on the LED light bar 10 to provide a voltage control signal for the LED lamp bead 11 . Due to the existence of the resistance in the signal line 12 , there is a difference between the voltage values at both ends of the signal line 12 , so that the level values at the two ends of the signal line 12 are different.
  • the high level end of the signal line 12 is the end connected to the chip on film 40 , and the low level end of the signal line 12 is the end far from the chip on film 40 . Because the voltage at the low-level end is low, the power of the LED lamp beads 11 located near the low-level end is also reduced accordingly, resulting in insufficient brightness, which causes the overall brightness distribution of the backlight module 1 to be uneven.
  • the distribution density of the LED lamp beads 11 near the low-level end of the signal line 12 is greater than the distribution density of the LED lamp beads 11 near the high-level end of the signal line 12 ,
  • the number of LED lamp beads 11 around the low-level end of the signal line 12 is increased, thereby improving the overall brightness at the low-level end.
  • the distance between the adjacent n th LED lamp beads 11 and the n+1 th LED lamp beads 11 close to the low level end of the signal line 12 is smaller than the distance between it and the high level end of the signal line 12
  • the second LED lamp bead 11 in an LED light bar 10 and its upper side are close to the signal line 12 high power
  • the distance between the first LED lamp beads 11 on the flat end is greater than the distance between the third LED lamp beads 11 on the lower side of the signal line 12 close to the low-level end of the signal line 12, and so on to gradually increase the low-level
  • the signal line is thinner, the resistance value thereof is greater, and the distribution density of the LED lamp beads is also greater.
  • the backlight module 1 provided in the embodiment of the present invention, by changing the arrangement of the LED lamp beads 11, the number of the LED lamp beads 11 at the low-level end of the signal line 12 is increased, and the brightness at the low-level end is improved, thereby solving the problem of solving the problem. Due to the problem of uneven brightness distribution caused by the voltage drop problem, the brightness of the dark part of the backlight module 1 is improved, the light emission is more uniform, and the display effect of the display device is improved.

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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

一种背光模组（1）及包括背光模组（1）的显示装置。背光模组（1）中包括衬底层（30）以及等距排布在衬底层（30）上的LED灯条（10）。LED灯条（10）包括一讯号线（12）以及若干LED灯珠（11）。LED灯珠（11）排列在讯号线（12）上，并与讯号线（12）电连接。其中，从讯号线（12）的低电平一端到讯号线（12）的高电平一端，LED灯珠（11）分布密度逐渐减小。

Description

背光模组及显示装置 技术领域
本发明涉及显示器件领域，特别是一种背光模组及显示装置。
 背景技术
随着显示技术的发展，液晶显示装置（Liquid Crystal Display，LCD）等平面显示装置因具有高画质、省电、机身薄及应用范围广等优点，而被广泛的应用于手机、电视、个人数字助理、数字相机、笔记本电脑、台式计算机等各种消费性电子产品，成为显示装置中的主流。现有市场上的液晶显示装置大部分为背光型液晶显示装置，其包括液晶显示面板及背光模组(Backlight Module)。液晶显示面板的工作原理是在两片平行的玻璃基板当中放置液晶分子，两片玻璃基板中间有许多垂直和水平的细小电线，通过通电与否来控制液晶分子改变方向，将背光模组的光线折射出来产生画面。由于液晶显示面板本身不发光，需要借由背光模组提供的光源来正常显示影像，因此，背光模组成为液晶显示装置的关键组件之一。背光模组依照光源入射位置的不同分成侧入式背光模组与直下式背光模组两种。
如图1，现有技术中存在一种直下式背光模组，其采用阵列式LED面光源，该直下式背光模组上设有若干LED灯珠11，而LED灯珠11之间通过讯号线12实现电连接，由于讯号线12中存在电阻，从而导致出现压降（IR Drop）问题，进而使背光模组整体发光亮度不均匀，影响显示装置的显示效果。
 技术问题
本发明的目的是提供一种背光模组及显示装置，以解决现有技术中背光模组亮度不均匀的问题。
 技术解决方案
为实现上述目的，本发明提供一种背光模组，所述背光模组中包括衬底层以及等距排布在所述衬底层上的LED灯条。所述LED灯条包括一讯号线以及若干LED灯珠。所述讯号线从所述衬底层的一侧延伸至对应的另一侧。所述LED灯珠排列在所述讯号线上，并与所述讯号线电连接。其中，从所述讯号线的低电平一端到所述讯号线的高电平一端， 所述LED灯珠分布密度逐渐减小。
进一步地，每一LED灯条中，相邻的两个LED灯珠之间的距离小于100微米。
进一步地，所述LED灯条中，第n个LED灯珠与靠近所述讯号线低电平一端的第n+1个LED灯珠之间的距离小于其与靠近所述讯号线高电平一端的第n-1个LED灯珠之间的距离。其中，n大于或等于2。
进一步地，所述LED灯珠的尺寸小于300微米。
进一步地，所述背光模组还包括覆晶薄膜，所述覆晶薄膜设于所述衬底层的一侧，并与所述讯号线的高电平一端连接。
进一步地，所述背光模组还包括阵列基板，所述阵列基板设于所述衬底层的一表面上，所述LED灯条设于所述阵列基板远离所述衬底层的一表面上。
进一步地，所述覆晶薄膜中设有控制电路，所述控制电路与所述讯号线连接。
进一步地，所述讯号线越细，其阻值越大，所述LED灯珠分布密度越大。。
进一步地，所述的LED灯珠是白光LED灯珠、红光LED灯珠、绿光LED灯珠和蓝光LED灯珠中的至少一种。
本发明中还提供一种显示装置，所述显示装置中包括如上所述的背光模组。
 有益效果
本发明的优点是：本发明中所提供的一种背光模组及显示装置，其通过增加讯号线低电平处的LED灯珠数量，从而提高此处的整体亮度，进而解决由于压降问题而出现的发光亮度均匀的问题，提高背光模组的亮度均匀性，也提高显示装置的显示效果。
 附图说明
图1为现有技术中背光模组的LED灯珠分布示意图；
图2为本发明实施例中背光模组的层状结构示意图；
图3为本发明实施例中背光模组中LED灯珠的分布示意图。
图中部件表示如下：
背光模组1；LED灯条10；
LED灯珠11；讯号线12；
阵列基板20；衬底层30；
覆晶薄膜40。
 本发明的实施方式
以下参考说明书附图介绍本发明的优选实施例，证明本发明可以实施，所述发明实施例可以向本领域中的技术人员完整介绍本发明，使其技术内容更加清楚和便于理解。本发明可以通过许多不同形式的发明实施例来得以体现，本发明的保护范围并非仅限于文中提到的实施例。
本发明实施例提供了一种显示装置，其具有一液晶显示面板，所述液晶显示面板用于为所述显示装置提供显示画面。所述显示装置可以为任何带有显示功能的显示器件，例如手机、笔记本电脑、电视机等。由于液晶显示面板中的液晶层不具有自发光功能，所以所述液晶显示面板中还具有一背光模组1，用于为液晶显示面板提供背光源。
如图2所示，所述背光模组1为直下型背光源，其具有一衬底层30，覆晶薄膜40、若干LED灯条10以及阵列基板20。
所述阵列基板20设于所述衬底层30的一表面上，所述阵列基板20中排列有若干薄膜晶体管，所述薄膜晶体管用于控制LED灯条10上每一个LED灯珠11的开启或关闭。
所述覆晶薄膜40设于所述衬底层30的一侧。在所述覆晶薄膜40中设有控制电路，所述阵列基板20和所述LED灯条10都与所述控制电路连接，所述控制电路用于发送控制信号控制LED灯条10上每一LED灯珠11的明暗。
所述LED灯条10排列在所述阵列基板20远离所述衬底层30的一表面上，每两根相邻的LED灯条10之间的距离相等，且相邻的两根LED灯条10之间的距离小于100微米，优选的其之间的距离小于50微米。
如图2所示，所述LED灯条10上安装了若干LED灯珠11，所述LED灯珠11呈一字型排列在所述LED灯条10上。所述LED灯珠11采用的是尺寸小于300微米的Mini-LED。若干LED灯条10排布在背光模组1中，每一LED灯条10中的LED灯珠11发光，为显示装置提供背光源。所述背光源一般为白光，其可以是通过白光LED灯珠直接发光形成，也可以通过红光LED灯珠、绿光LED灯珠和蓝光LED灯珠的组合发光形成白光。其中，相邻的两个LED灯珠11之间的距离小于100微米，并且所述LED灯条10上的LED灯珠11的密度并不相同，所述LED灯珠11的分布密度从所述LED灯条10的一端往另一端逐渐减小。
所述LED灯条10中还具有一根讯号线12，所述讯号线12从所述阵列基板20靠近所述覆晶薄膜40的一侧延伸至所述阵列基板20远离所述覆晶薄膜40的一侧。所述讯号线12的一端与所述覆晶薄膜40中的控制电路连接，并依次连接LED灯条10上的每一LED灯珠11，为LED灯珠11提供电压控制信号。由于所述讯号线12中电阻的存在，导致讯号线12两端的电压值之间具有差异，使所述讯号线12两端的电平值不同。其中，所述讯号线12高电平的一端为与所述覆晶薄膜40连接的一端，所述讯号线12低电平一端为远离所述覆晶薄膜40的一端。由于所述低电平一端的电压低，所以位于低电平一端的附近的LED灯珠11功率也随之降低，亮度不足，并导致背光模组1的整体亮度分布不匀。
在本发明实施例所提供的LED灯条10中，其靠近讯号线12低电平一端处的LED灯珠11分布密度大于其靠近讯号线12高电平一端处的LED灯珠11分布密度，增加了讯号线12低电平一端周围的LED灯珠11数量，从而提高低电平一端处的整体亮度。其中，相邻的第n个LED灯珠11与靠近所述讯号线12低电平一端的第n+1个LED灯珠11之间的距离小于其与靠近所述讯号线12高电平一端的第n-1个LED灯珠11之间的距离，例如，从图3上方往下方数，一LED灯条10中的第2个LED灯珠11与其上侧靠近所述讯号线12高电平一端的第1个LED灯珠11之间的距离大于与其下侧靠近所述讯号线12低电平一端的第3个LED灯珠11之间的距离，并以此类推逐渐增加低电平一端处的LED灯珠11分布密度，越靠近所述低电平一端，设置的LED灯珠11越多，从而解决低电平一端处LED灯珠11亮度不足而导致的背光模组1整体亮度不匀的问题。当所述讯号线越细，其阻值越大，所述LED灯珠分布密度也越大。
本发明实施例中所提供的背光模组1，通过改变LED灯珠11的排布方式，增加讯号线12低电平一端处的LED灯珠11数量，提高低电平一端处的亮度，解决由于压降问题而导致的亮度分布不匀的问题，提高背光模组1暗处的亮度，使发光更加均匀，并提高显示装置的显示效果。
虽然在本文中参照了特定的实施方式来描述本发明，但是应该理解的是，这些实施例仅仅是本发明的原理和应用的示例。因此应该理解的是，可以对示例性的实施例进行许多修改，并且可以设计出其他的布置，只要不偏离所附权利要求所限定的本发明的精神和范围。应该理解的是，可以通过不同于原始权利要求所描述的方式来结合不同的从属权利要求和本文中所述的特征。还可以理解的是，结合单独实施例所描述的特征可以使用在其他所述实施例中。

Claims (10)

  1. 一种背光模组，其包括：
    衬底层；
    至少两条LED灯条，等距排布在所述衬底层上；
    所述LED灯条包括：
    一讯号线，从所述衬底层的一侧延伸至对应的另一侧；
    LED灯珠，排列在所述讯号线上，并与所述讯号线电连接；
    从所述讯号线的低电平一端到所述讯号线的高电平一端， 所述LED灯珠分布密度逐渐减小。
  2. 如权利要求1所述的背光模组，其中，每一LED灯条中，相邻的两个LED灯珠之间的距离小于100微米。
  3. 如权利要求1所述的背光模组，其中，所述LED灯条中，第n个LED灯珠与靠近所述讯号线低电平一端的第n+1个LED灯珠之间的距离小于其与靠近所述讯号线高电平一端的第n-1个LED灯珠之间的距离；其中，n大于或等于2。
  4. 如权利要求1所述的背光模组，其中，所述LED灯珠的尺寸小于300微米。
  5. 如权利要求1所述的背光模组，其还包括：
    覆晶薄膜，设于所述衬底层的一侧，并与所述讯号线的高电平一端连接。
  6. 如权利要求1所述的背光模组，其还包括：
    阵列基板，设于所述衬底层的一表面上，所述LED灯条设于所述阵列基板远离所述衬底层的一表面上。
  7. 如权利要求5所述的背光模组，其中，所述覆晶薄膜中设有控制电路，所述控制电路与所述讯号线连接。
  8. 如权利要求1所述的背光模组，其中，所述讯号线越细，其阻值越大，所述LED灯珠分布密度越大。
  9. 如权利要求1所述的背光模组，其中，所述的LED灯珠是白光LED灯珠、红光LED灯珠、绿光LED灯珠和蓝光LED灯珠中的至少一种。
  10.     一种显示装置，其包括如权利要求1中所述的背光模组。
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