WO2016011781A1 - 显示装置 - Google Patents

显示装置 Download PDF

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Publication number
WO2016011781A1
WO2016011781A1 PCT/CN2014/095570 CN2014095570W WO2016011781A1 WO 2016011781 A1 WO2016011781 A1 WO 2016011781A1 CN 2014095570 W CN2014095570 W CN 2014095570W WO 2016011781 A1 WO2016011781 A1 WO 2016011781A1
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Prior art keywords
woa
traces
resistance
display device
trace
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PCT/CN2014/095570
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English (en)
French (fr)
Inventor
陈彩琴
连校许
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US14/416,642 priority Critical patent/US9507229B2/en
Publication of WO2016011781A1 publication Critical patent/WO2016011781A1/zh
Anticipated expiration legal-status Critical
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    • 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
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/136286—Wiring, e.g. gate line, drain line
    • 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
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G02F1/13452—Conductors connecting driver circuitry and terminals of panels
    • 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
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G02F1/13454—Drivers integrated on the active matrix substrate

Definitions

  • the present invention relates to the field of display technology, and in particular to a display device.
  • each pixel is controlled by a grid line and a data line which are criss-crossed on the substrate to realize display of an image.
  • the gate driving circuit and the data circuit are often fabricated on the same printed circuit board (PCB), and then the PCB is used for the transmission gate drive by using the Wire On Array (WOA).
  • WOA Wire On Array
  • the liquid crystal display usually includes at least two COFs for transmitting gate drive signals, and the adjacent two COFs are also connected by WOA. Each COF is connected to a set of fanouts on the substrate and connected to the respective gate lines by sector leads.
  • the resistance value of the gate line connected to the latter COF is larger than the resistance value of the gate line connected to the previous COF, so that the waveform of the gate driving signal on the two gate lines is obtained.
  • the difference in waveform of the gate drive signal at the junction of the two COFs that is, the last gate line of the previous COF connection and the first gate line connected to the latter COF, is particularly noticeable.
  • the thin film transistor (TFT) characteristic curve is shifted, the leakage current is increased or the charging becomes insufficient, and the difference of the waveform is more obvious, resulting in the liquid crystal display in the COF.
  • Linear bright spots or dark spots (mura) appear at the junction, which is the horizontal block defect (Hblock), which affects the display effect of the liquid crystal display.
  • the present invention provides a display device including a substrate, a gate driving circuit and at least two flip chip COFs for transmitting gate driving signals, the display device further comprising at least two traces, each of the COFs passing through One of the traces is connected to the gate driving circuit;
  • Each of the traces includes a substrate trace WOA, and all or part of the traces further include a resistor in series with the WOA.
  • the resistances of the respective traces are equal.
  • each of the traces includes a resistor in series with the WOA
  • the resistance of the WOA is not equal, and the difference between the resistances of the resistors in the two traces is equal to the difference between the resistances of the WOAs in the two traces.
  • the trace connected to the last COF consists only of the WOA, and the remaining traces each comprise a resistor in series with the WOA.
  • the resistance of the WOA in the trace connected to the last COF is greater than the resistance of the WOA in any other trace
  • the resistance of the resistor in any of the other traces is equal to the difference between the resistance of the WOA in the trace connected to the last COF and the resistance of the WOA in the trace.
  • the resistor is a variable resistor.
  • At least two sets of fan-shaped leads and a plurality of gate lines are disposed on the substrate, and each of the COFs is connected to the fan-shaped leads of each group in a one-to-one correspondence;
  • the sector lead includes a plurality of leads, and each of the leads is connected to the gate line in one-to-one correspondence.
  • the resistance of each of the leads is equal.
  • each COF is connected to the gate driving circuit through a trace, and each of the traces includes a WOA. Because the distance between each COF and the gate drive circuit is different, the length of the WOA in each trace is also different, and the resistance of the WOA in each trace is also different.
  • the present invention by setting the resistance in series with the WOA in all or part of the trace, the different resistance values of the WOA in each trace are compensated, so that the resistance values of the traces can be as close as possible or even equal to eliminate the gate.
  • the waveform difference of the driving signal solves the technical problem of the horizontal block defect caused by the resistance value of the WOA in the prior art, and improves the display device. display effect.
  • FIG. 1 is a schematic diagram of a display device according to an embodiment of the present invention.
  • a display device provided by an embodiment of the invention includes a substrate, a printed circuit board (PCB), and a plurality of COFs for respectively transmitting gate drive signals and data signals.
  • PCB printed circuit board
  • the display device further includes two traces 21 and 22 , and each of the COFs 11 and 12 passes through a trace 21 . 22 is connected to the gate drive circuit 30 on the PCB 3. In other embodiments, there may be three COFs and three traces, or more COFs and traces.
  • the trace 21 connected to the first COF 11 includes a WOA 41 and a resistor 40 connected in series with the WOA 41; and the trace 22 connected to the second COF 12 is composed only of the WOA 42.
  • each of the COFs 11 and 12 is connected to the gate driving circuit 30 through a trace 21, 22, and each of the traces 21, 22 includes WOA 41, 42 respectively. Since the distance between the COFs 11 and 12 and the gate driving circuit 30 is different, the lengths of the WOAs 41 and 42 in the traces 21 and 22 are also different, and the resistance values of the WOAs 41 and 42 are also different. In the embodiment of the present invention, by setting the resistor 40 connected in series with the WOA 41 in the trace 21, the different resistance values of the WOA 41 and 42 are compensated, so that the resistance values of the traces 21 and 22 can be as close as possible or even equal. The waveform difference of the gate driving signal is eliminated, thereby solving the technical problem of the horizontal block defect (Hblock) caused by the resistance value of the WOA in the prior art, and improving the display effect of the display device.
  • Hblock horizontal block defect
  • the trace 21 and the trace 22 have the same resistance.
  • the resistance of the WOA 42 in the trace 22 connected to the COF 12 is greater than the resistance of the WOA 41 in the trace 21 connected to the COF 11.
  • the resistance of the resistor 40 in the trace 21 is equal to the difference between the resistance of the WOA 42 in the trace 22 and the resistance of the WOA 41 in the trace 21.
  • the substrate 5 is further provided with two sets of sector leads 7 and a plurality of gate lines 6.
  • the COFs 11 and 12 are connected to the two sets of fan-shaped leads 7 one by one, and are connected to the respective gate lines 6.
  • Each set of sector leads 7 includes a plurality of leads 70, and each of the leads 70 is connected to the gate line 6 in a one-to-one correspondence.
  • the resistances of the respective leads 70 are equal to avoid a difference in the waveform of the gate driving signals on the respective gate lines 6 due to the difference in resistance of the portion of the sector leads 7.
  • the resistance value of the WOA 41 in the trace 21 may be represented as R1; the resistance value of the WOA 42 in the trace 22 is greater than the resistance value of the WOA 41, and the WOA 42 and the WOA 41
  • the difference between the resistance values is expressed as R2, that is, the resistance of WOA42 is R1+R2; the resistance of each lead 70 in the sector lead 7 is R3; the resistance of the resistor 40 in the trace 21 is R2', and R2' and R2 equal.
  • the resistor 40 can be a variable resistor.
  • the resistance values of WOA41 and 42 may also change.
  • the resistor 40 is set as a variable resistor, which can more conveniently adjust the resistance of the resistor 40, so that the traces 21 and 22 can be in different environments. Have equal resistance values.
  • more COFs, traces, and sector leads may be provided in the display device. It is also possible to provide a resistor in series with the WOA in each of the traces, and both are variable resistors. In this way, the resistance of the resistor in each trace can be conveniently adjusted, so that the difference between the resistances of the resistors in any two traces is equal to the difference between the resistances of the WOAs in the two traces. That is, by adjusting the resistance of the resistors in each trace, each trace has an equal resistance.
  • the capacitive reactance of the WOA in addition to the main interference of the impedance of the WOA on the gate driving signal, the capacitive reactance of the WOA also generates a small amount of the gate driving signal. Interference, the longer the length of the WOA, the greater the capacitive reactance on the WOA. Therefore, the resistance of the resistor in series with the shorter WOA can be slightly less than the difference between the impedance of the shorter WOA and the other longer WOA, so that the impedance and the capacitive reactance of the WOA and the resistor in the two traces equal.

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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)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Liquid Crystal (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

一种显示装置，属于显示技术领域，解决了现有技术中由于WOA的阻值造成的水平区块不良的技术问题。显示装置，包括基板、栅极驱动电路（30）和至少两个用于传输栅极驱动信号的覆晶薄膜COF（11、12），显示装置还包括至少两条走线（21、22），每个COF（11、12）各通过一条走线（21、22）连接至栅极驱动电路（30）；每条走线（21、22）中均包括基板走线WOA（41、42），全部或部分走线（21、22）中还包括与WOA（41、42）串联的电阻。这种显示装置可用于液晶电视、液晶显示器、手机、平板电脑等显示装置。

Description

显示装置
本申请要求享有2014年7月22日提交的名称为“显示装置”的中国专利申请CN201410351534.9的优先权，其全部内容通过引用并入本文中。
技术领域
本发明涉及显示技术领域，具体地说，涉及一种显示装置。
背景技术
随着显示技术的发展，液晶显示器已经成为最为常见的平板显示装置。在液晶显示器中，由基板上纵横交错的栅线和数据线控制各个像素，以实现图像的显示。
目前，为了节省成本，经常将栅极驱动电路和数据电路制作在同一块印刷电路板(PCB)上，再利用基板走线(Wire On Array，简称WOA)将该PCB与用于传输栅极驱动信号的覆晶薄膜(Chip On Film，简称COF)连接。液晶显示器中通常包括至少两个用于传输栅极驱动信号的COF，相邻的两个COF之间也通过WOA连接。每个COF分别与基板上的一组扇形引线(fanout)相连，并通过扇形引线连接至各条栅线。
由于WOA具有一定的阻值，所以与后一个COF相连的栅线的阻值，会比与前一个COF相连的栅线的阻值大，使得这两条栅线上的栅极驱动信号的波形产生差异。在两个COF的交界处，也就是前一个COF连接的最后一条栅线与后一个COF连接的第一条栅线上的栅极驱动信号的波形差异会显得特别明显。尤其是经过信赖性高温高湿测试之后，会使薄膜晶体管(Thin Film Transistor，简称TFT)特性曲线偏移，漏电流增大或充电变得不足，使该波形差异更加明显，导致液晶显示器在COF的交界处出现线状的亮斑或暗斑(mura)，也就是水平区块不良(Hblock)，影响了液晶显示器的显示效果。
发明内容
本发明的目的在于提供一种显示装置，以解决现有技术中由于WOA的阻值造成的水 平区块不良的技术问题。
本发明提供一种显示装置，包括基板、栅极驱动电路和至少两个用于传输栅极驱动信号的覆晶薄膜COF，该显示装置还包括至少两条走线，每个所述COF各通过一条所述走线连接至所述栅极驱动电路；
每条所述走线中均包括基板走线WOA，全部或部分所述走线中还包括与所述WOA串联的电阻。
优选的，各条所述走线的阻值相等。
可选的，每条所述走线中均包括与所述WOA串联的电阻；
在任意两条走线中，WOA的阻值不等，该两条走线中电阻的阻值之差，等于该两条走线中WOA的阻值之差。
或者，与最后一个COF相连的走线仅由所述WOA构成，其余各条走线均包括与所述WOA串联的电阻。
进一步，与最后一个COF相连的走线中WOA的阻值，大于其他任意一条走线中WOA的阻值；
其他任意一条走线中电阻的阻值，等于所述与最后一个COF相连的走线中WOA的阻值与该任意一条走线中WOA的阻值之差。
优选的，所述电阻为可变电阻。
进一步，所述基板上设置有至少两组扇形引线及若干条栅线，各个所述COF与各组所述扇形引线一一对应相连；
所述扇形引线包括若干条引线，各条所述引线与所述栅线一一对应相连。
优选的，各条所述引线的阻值相等。
本发明带来了以下有益效果：本发明提供的显示装置中，每个COF各通过一条走线连接至栅极驱动电路，且每条走线中均包括WOA。因为各COF与栅极驱动电路之间的距离不同，所以各走线中WOA的长度也不同，则各走线中WOA的阻值也不同。本发明中，通过在全部或部分走线中设置与WOA串联的电阻，补偿各走线中WOA的不同阻值，使得各走线的阻值能够尽可能的接近，甚至相等，以消除栅极驱动信号的波形差异，从而解决了现有技术中由于WOA的阻值造成的水平区块不良的技术问题，改善了显示装置的 显示效果。
本发明的其它特征和优点将在随后的说明书中阐述，并且，部分地从说明书中变得显而易见，或者通过实施本发明而了解。本发明的目的和其他优点可通过在说明书、权利要求书以及附图中所特别指出的结构来实现和获得。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要的附图做简单的介绍：
图1是本发明实施例提供的显示装置的示意图。
具体实施方式
以下将结合附图及实施例来详细说明本发明的实施方式，借此对本发明如何应用技术手段来解决技术问题，并达成技术效果的实现过程能充分理解并据以实施。需要说明的是，只要不构成冲突，本发明中的各个实施例以及各实施例中的各个特征可以相互结合，所形成的技术方案均在本发明的保护范围之内。
本发明实施例提供的显示装置，包括基板、印刷电路板(PCB)，及分别用于传输栅极驱动信号和数据信号的若干个COF。
如图1所示，本实施例中具有两个用于传输栅极驱动信号的COF11、12，该显示装置还包括两条走线21、22，每个COF11、12各通过一条走线21、22连接至PCB3上的栅极驱动电路30。在其他实施方式中，也可以具有三个COF及三条走线，或者更多的COF及走线。
本实施例中，与第一个COF11相连的走线21包括WOA41，及与WOA41串联的电阻40；与第二个COF12相连的走线22仅由WOA42构成。
本发明实施例提供的显示装置中，每个COF11、12各通过一条走线21、22连接至栅极驱动电路30，且每条走线21、22中分别包括WOA41、42。因为COF11、12与栅极驱动电路30之间的距离不同，所以走线21、22中WOA41、42的长度也不同，则WOA41、42的阻值也不同。本发明实施例中，通过在走线21中设置与WOA41串联的电阻40，补偿WOA41、42的不同阻值，使得走线21、22的阻值能够尽可能的接近，甚至相等，以 消除栅极驱动信号的波形差异，从而解决了现有技术中由于WOA的阻值造成的水平区块不良(Hblock)的技术问题，改善了显示装置的显示效果。
作为一个优选方案，走线21与走线22的阻值相等。本实施例中，与COF12相连的走线22中WOA42的阻值，大于与COF11相连的走线21中WOA41的阻值。走线21中电阻40的阻值，等于走线22中WOA42的阻值与走线21中WOA41的阻值之差。
进一步，基板5上还设置有两组扇形引线7及若干条栅线6，COF11、12与两组扇形引线7一一对应相连，再连接至各条栅线6。每组扇形引线7均包括若干条引线70，各条引线70与栅线6一一对应相连。优选的，各条引线70的阻值相等，以避免由于扇形引线7部分的阻值差异造成各栅线6上的栅极驱动信号的波形产生差异。
为了更为直观的说明本发明实施例中栅线6的阻值，可以将走线21中WOA41的阻值表示为R1；走线22中WOA42的阻值大于WOA41的阻值，将WOA42与WOA41的阻值之差表示为R2，即WOA42的阻值为R1+R2；扇形引线7中各引线70的阻值为R3；走线21中电阻40的阻值为R2’，且R2’与R2相等。则与COF11相连的最后一条栅线6A的阻值RA＝R2’+R1+R3，与COF12相连的第一条栅线6B的阻值RB＝R1+R2+R3。因为R2＝R2’，所以RA＝RB，即这两条栅线6A、6B的阻值相等，从而消除了这两条栅线6A、6B上栅极驱动信号的波形差异，解决了现有技术中由于WOA的阻值造成的水平区块不良(Hblock)的技术问题，改善了显示装置的显示效果。
优选的，电阻40可以为可变电阻。在外界环境变化时，WOA41、42的阻值也可能会发生变化，将电阻40设置为可变电阻，可以更加方便的调节电阻40的阻值，使走线21、22在不同环境下都能具有相等的阻值。
在其他实施方式中，显示装置中可以设置有更多的COF、走线以及扇形引线。还可以在每条走线中都设置有与WOA串联的电阻，且均为可变电阻。这样就可以方便的调节每条走线中电阻的阻值，使任意两条走线中电阻的阻值之差，等于该两条走线中WOA的阻值之差。也就是通过调节各条走线中电阻的阻值，使每条走线都具有相等的阻值。
此外，栅极驱动信号在各条走线中的WOA上的传输过程中，除WOA的阻抗对栅极驱动信号产生的主要干扰之外，WOA的容抗也会对栅极驱动信号产生微小的干扰，WOA的长度越长，WOA上的容抗也会更大。因此，与较短的WOA串联的电阻的阻值可以略小于，该较短的WOA与其他较长的WOA的阻抗之差，使这两条走线中WOA与电阻的阻抗和容抗之和相等。
虽然本发明所公开的实施方式如上，但所述的内容只是为了便于理解本发明而采用的实施方式，并非用以限定本发明。任何本发明所属技术领域内的技术人员，在不脱离本发明所公开的精神和范围的前提下，可以在实施的形式上及细节上作任何的修改与变化，但本发明的专利保护范围，仍须以所附的权利要求书所界定的范围为准。

Claims (8)

  1. 一种显示装置，包括基板、栅极驱动电路和至少两个用于传输栅极驱动信号的覆晶薄膜COF，其中，还包括至少两条走线，每个所述COF各通过一条所述走线连接至所述栅极驱动电路；
    每条所述走线中均包括基板走线WOA，全部或部分所述走线中还包括与所述WOA串联的电阻。
  2. 如权利要求1所述的显示装置，其中，各条所述走线的阻值相等。
  3. 如权利要求1所述的显示装置，其中，每条所述走线中均包括与所述WOA串联的电阻；
    在任意两条走线中，WOA的阻值不等，该两条走线中电阻的阻值之差，等于该两条走线中WOA的阻值之差。
  4. 如权利要求1所述的显示装置，其中，与最后一个COF相连的走线仅由所述WOA构成，其余各条走线均包括与所述WOA串联的电阻。
  5. 如权利要求4所述的显示装置，其中，与最后一个COF相连的走线中WOA的阻值，大于其他任意一条走线中WOA的阻值；
    其他任意一条走线中电阻的阻值，等于所述与最后一个COF相连的走线中WOA的阻值与该任意一条走线中WOA的阻值之差。
  6. 如权利要求1所述的显示装置，其中，所述电阻为可变电阻。
  7. 如权利要求1所述的显示装置，其中，所述基板上设置有至少两组扇形引线及若干条栅线，各个所述COF与各组所述扇形引线一一对应相连；
    所述扇形引线包括若干条引线，各条所述引线与所述栅线一一对应相连。
  8. 如权利要求7所述的显示装置，其中，各条所述引线的阻值相等。
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