WO2013155674A1 - 转换接口及液晶显示器检测系统 - Google Patents

转换接口及液晶显示器检测系统 Download PDF

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Publication number
WO2013155674A1
WO2013155674A1 PCT/CN2012/074233 CN2012074233W WO2013155674A1 WO 2013155674 A1 WO2013155674 A1 WO 2013155674A1 CN 2012074233 W CN2012074233 W CN 2012074233W WO 2013155674 A1 WO2013155674 A1 WO 2013155674A1
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WO
WIPO (PCT)
Prior art keywords
interface
liquid crystal
conversion interface
connector
line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2012/074233
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English (en)
French (fr)
Inventor
邓明锋
蔡荣茂
文松贤
庄益壮
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TCL China Star Optoelectronics Technology Co Ltd
Original Assignee
Shenzhen China Star Optoelectronics Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US13/576,400 priority Critical patent/US20130273776A1/en
Publication of WO2013155674A1 publication Critical patent/WO2013155674A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2092—Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • G09G3/2096—Details of the interface to the display terminal specific for a flat panel
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/04—Display protection
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2370/00—Aspects of data communication
    • G09G2370/14—Use of low voltage differential signaling [LVDS] for display data communication
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals

Definitions

  • the invention relates to the field of product detection, in particular to a conversion interface and a liquid crystal display detection system.
  • TFT LCD Thin Film Transistor Liquid Crystal Display, thin film transistor liquid crystal display
  • IT Information Technology, IT
  • Its main working principle is to load the Array glass substrate and color filter (Color) with appropriate voltage.
  • Filter, CF Between the liquid crystal layers between the glass substrates, the liquid crystal molecules of the liquid crystal layer are deflected under the action of voltage, and different transmittances are obtained by different voltage control, thereby realizing display.
  • LVDS Low-Voltage Differential
  • FIG. 1 is a schematic structural diagram of a liquid crystal display detection system according to the prior art, and the liquid crystal display detection system includes The test signal source 11, the LCD product 12, the LVDS signal line 13, the LVDS line 13 are connected to the interface 14 of the test signal source 11, the interface 15 of the LCD panel 12 to be lit and the LVDS line 13, and the LVDS of the test signal source 11.
  • the signal line 13 is externally connected to the interface 16.
  • test signal source 11 can be matched to different types of LCD products 12, it is necessary to connect using different LVDS signal lines 13. Since in the production, it is necessary to frequently replace different types of LCD products for testing, it is necessary to frequently insert and unplug the LVDS signal line interface 14 on the test signal source PCB interface 16, which is easy to cause damage to the part and is invalid.
  • the technical problem to be solved by the present invention is to provide a conversion interface and a liquid crystal display detection system, which can avoid the damage of the interface on the signal source caused by frequent plugging and unplugging of the external interface of the low voltage differential signal line on the test signal source.
  • a technical solution adopted by the present invention is to provide a conversion interface applied to a screen inspection of a liquid crystal display device, and the conversion interface includes a first connector, an adapter body, and a second connector that are sequentially connected; a connector for interfacing with a test signal source, and a second connector for interfacing with a connector connected to the liquid crystal display device, the connection cable being a low voltage differential signal LVDS connection line; wherein the adapter body comprises static electricity Protection circuit.
  • the static protection circuit includes a signal line in the conversion interface or a transient voltage suppressor directly connected in series between the power line and the ground, and the transient voltage suppressor maintains the voltage of the signal line or the power line in the conversion interface in the clamp position. Below the voltage.
  • the second joint is a snap joint.
  • a technical solution adopted by the present invention is to provide a conversion interface applied to a screen inspection of a liquid crystal display device, and the conversion interface includes a first connector, an adapter body, and a second connector that are sequentially connected; A connector is used for interfacing with a test signal source, and a second connector is for interfacing with an interface of a connection line connected to the liquid crystal display device.
  • the adapter body includes an electrostatic protection circuit.
  • the static protection circuit includes a signal line in the conversion interface or a transient voltage suppressor directly connected in series between the power line and the ground, and the transient voltage suppressor maintains the voltage of the signal line or the power line in the conversion interface in the clamp position. Below the voltage.
  • the connecting line is a low voltage differential signal LVDS connecting line.
  • the second joint is a snap joint.
  • a technical solution adopted by the present invention is to provide a liquid crystal display detection system, which includes: a test signal source, a conversion interface, a low voltage differential signal wire, and a liquid crystal panel; wherein, the test signal source The first interface is provided; the conversion interface comprises a first connector, an adapter body and a second connector which are sequentially connected, and the adapter body is disposed at a middle portion of the conversion interface; the second interface is provided at one end of the low voltage differential signal wire, and the other end is provided There is a third interface; a fourth interface is disposed on the liquid crystal panel; wherein the first interface on the test signal source is connected to the first connector of the conversion interface; and the second connector on the conversion interface is connected to the second interface of the low voltage differential signal wire The third interface of the low voltage differential signal wire is connected to the fourth interface on the liquid crystal panel.
  • the signal body and the power line are arranged in the transfer body, and a transient voltage suppressor is directly connected in series between the signal line or the power line and the ground.
  • the liquid crystal panel is a thin film transistor liquid crystal display panel.
  • the second joint is a snap joint.
  • the invention has the beneficial effects that the detection signal source and the connection to the liquid crystal display device are connected in the invention when the test signal source and the liquid crystal panel are directly connected through the low voltage differential signal line when detecting the liquid crystal display in the prior art.
  • a conversion interface is added between the lines, wherein the conversion interface includes a first connector, an adapter body and a second connector that are sequentially connected, the first connector is used for interfacing with a test signal source, and the second connector is used for connection to The interface of the connection line of the liquid crystal display device is plugged in.
  • the invention has the function of adding a conversion interface, and the connection line connected to the liquid crystal display device does not need to be directly plugged directly with the interface of the test signal source, thereby avoiding the low voltage difference on the test signal source. The interface caused by frequent plugging and unplugging of the signal line external interface is damaged.
  • FIG. 1 is a schematic structural view of a liquid crystal display detection system in the prior art
  • FIG. 2 is a schematic structural view of an embodiment of a liquid crystal display detection system of the present invention.
  • FIG. 3 is a circuit diagram of an electrostatic protection circuit of an embodiment of a conversion interface of the present invention.
  • Figure 4 is a characteristic diagram of a diode analogous to the electrostatic protection circuit of Figure 3;
  • Figure 5 is a characteristic diagram 1 of the transient voltage suppressor of Figure 3 of the present invention.
  • Fig. 6 is a second characteristic diagram of the transient voltage suppressor of Fig. 3 of the present invention.
  • the LVDS wire is directly connected to the test signal source and the liquid crystal panel (Panel).
  • the test signal source In actual production, different models/categories of the Panel need to match different LVDS wires, which leads to frequent plugging and unplugging of the external interface of the low-voltage differential signal line on the test signal source, which is not only easy to cause the test signal source interface during the interface insertion and removal process.
  • the physical loss also brings about static electricity, which reduces the life of the test signal source.
  • FIG. 2 is a schematic structural diagram of an embodiment of a liquid crystal display detection system according to the present invention.
  • the liquid crystal display detection system includes a test signal source 1, a conversion interface 2, a low voltage differential signal wire 3, and a liquid crystal panel 4.
  • the test signal source 1 is provided with a first interface 17; the two ends of the conversion interface 2 are respectively provided with a first joint 21 and a second joint 22, and the middle dotted line portion is provided with an adapter body 23, a first joint 21, and a turn
  • the main body 23 and the second joint 22 are electrically connected in sequence; one end of the low-voltage differential signal wire 3 is provided with a second interface 31, and the other end is provided with a third interface 32; and the liquid crystal panel 4 is provided with a fourth interface 41.
  • the conversion interface 2 includes a first connector 21, an adapter body 23 and a second connector 22 that are sequentially connected, wherein the first connector 21 and the second connector 22 are respectively located at two ends of the conversion interface 2, and are switched.
  • the main body 23 is disposed at an intermediate portion of the conversion interface 2.
  • the first joint 21 is for interfacing with the interface 17 of the test signal source 1, and the second joint 22 is for mating with the interface 31 of the connection line 3 connected to the liquid crystal display device 4.
  • the specific connection mode is that the first interface 17 on the test signal source 1 is connected to the first connector 21 of the conversion interface 2, and the second connector 22 of the conversion interface 2 is connected to the second interface 31 of the low voltage differential signal wire 3, and the low voltage difference is The third interface 32 of the signal wire 3 is connected to the fourth interface 41 on the liquid crystal panel 4.
  • the second joint 22 may be a snap joint, and the second joint 22 is inserted into the interface 31 of the connecting wire 3 connected to the liquid crystal display device 4, and then fixed by using a buckle.
  • the invention only needs to insert and remove the end of the conversion interface and the LVDS wire when the Panel sample is replaced during the test, thereby avoiding the frequent insertion and removal of the external interface 17 of the low voltage differential signal line on the test signal source 1.
  • the interface is damaged.
  • the liquid crystal display device 4 includes a thin film transistor liquid crystal display panel or the like.
  • the connection line 3 connecting the test signal source 1 and the liquid crystal display device 4 is a low voltage differential signal connection line.
  • the test signal source 1 is an instrument that provides various electronic signals during the test.
  • the interface 16 on the signal source 11 of the prior art test and the interface 14 on the LVDS signal line 13 generate a certain electrostatic effect during the insertion and removal operation, and the electrostatic discharge (Electro-Static) The discharge, ESD) will cause an impact on the chip in the test signal source 11, resulting in a rapid failure of the test signal source 11.
  • ESD electrostatic discharge
  • FIG. 3 is a circuit diagram of an electrostatic protection circuit implemented by the conversion interface of the present invention.
  • the adapter body 23 is provided with a signal line and a power line.
  • a transient voltage suppressor Transient
  • a transient voltage suppressor is directly connected in series between the signal line or power line and ground (Gnd).
  • Voltage Suppressor, TVS) In is the input of the current
  • Out is the output of the current
  • U (TVS) is the voltage of the line
  • the characteristics of the TVS tube are similar to the characteristics of the diode.
  • FIG. 4 is a characteristic diagram of a diode analogous to the static electricity protection circuit of FIG.
  • VBR and IT are the voltage and current of the reverse diode breakdown, respectively.
  • Vc and Ipp are the clamping voltage after the breakdown of the diode and the allowable peak current.
  • FIG. 5 and FIG. 6 are characteristic curves of the transient voltage suppressor in the embodiment of the conversion interface of the present invention.
  • FIG. 5 when the current through the TVS tube reaches 1 mA, the TVS tube is in a reverse breakdown state. At this time, due to the avalanche effect, the internal resistance of the TVS tube is sharply reduced, and the current flows directly from the TVS tube to the ground to achieve stability. Pressure.
  • curve 61 represents the current characteristics of the TVS tube, which will decrease exponentially after the current through the TVS tube reaches a maximum Ipp.
  • Curve 62 represents the voltage characteristics of the TVS tube, and the voltage applied across the TVS tube is stabilized below the clamp voltage Vc, thereby ensuring that the voltage transfer peak of the line does not exceed Vc.
  • the LVDS wire is used to connect the conversion interface and the Panel to generate static electricity
  • both ends of the TVS tube are subjected to an instantaneous high-energy impact, it can be made within 1Ps (1*10-12S).
  • the resistance is reduced, so that most of the current is passed through the ground, thereby clamping the voltage across the TVS tube to Vc, thereby protecting the impact on the test signal source circuit, reducing the test signal source failure and the damage. possibility.
  • the present invention changes the connection between the test signal source and the Panel directly with the LVDS wire, and uses a conversion interface with ESD protection function to reduce the damage caused by static electricity generated by the plugging and unplugging to the test signal source.
  • the present invention connects the test signal source with the LVDS line by adding a conversion interface, and replaces the Panel sample.
  • the conversion interface and the LVDS line is plugged and unplugged, which avoids the interface damage caused by frequent plugging and unplugging of the external interface of the low voltage differential signal line on the test signal source.
  • a TVS tube is directly connected in series between the signal line or the power line and the ground, so that the static electricity caused by the plugging can be reduced to damage the test signal source.
  • a diode that is breakdowntable at a predetermined voltage may be directly connected in series between the signal line or the power line and ground in place of the aforementioned transient voltage suppressor.
  • the negative pole of the diode is connected to the signal line or the power line, and the positive pole is connected to the ground to prevent the damage of the electronic chip by static electricity.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
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Description

转换接口及液晶显示器检测系统
【技术领域】
本发明涉及产品检测领域，特别是涉及一种转换接口及液晶显示器检测系统。
【背景技术】
TFT LCD（Thin Film Transistor Liquid Crystal Display，薄膜晶体管液晶显示器 ）已经成为了现代信息技术（Information Technology，IT）、视讯产品中重要的显示平台。其主要工作原理是通过适当的电压加载在阵列（Array）玻璃基板与彩色滤光片（Color Filter，CF）玻璃基板之间的液晶层间，使液晶层的液晶分子在电压作用下发生偏转，通过不同电压控制得到不同的穿透率，从而实现显示。
为了保证LCD的出厂品质，在LCD 模组厂内，点灯检查、出货检查以及复判检查等工位中都需要对产品的画面进行检查，具体通过低压差分信号（Low-Voltage Differential Signaling，LVDS）线连接LCD产品与测试用信号源来实现检测。
现有技术中，通常采用LVDS线直接将LCD LVDS接口与测试用信号源印制电路板（Printed Circuit Board，PCB）连接的方式。如图1所示，是现有技术一种液晶显示器检测系统的结构示意图，所述液晶显示器检测系统包括 测试用信号源11、LCD产品12、LVDS信号线13、LVDS线13连接测试用信号源11的接口14、需要点亮的LCD面板12与LVDS线13的接口15以及测试用信号源11的LVDS信号线13外接接口16。
由于测试用信号源11可以匹配到不同型号的LCD产品12，因此需要使用不同的LVDS信号线13进行连接。由于在生产中，需要经常更换不同型号的LCD产品进行测试，因此需要频繁的在测试用信号源PCB接口16上进行插拔LVDS信号线接口14，很容易造成该部位损坏而作废。
【发明内容】
本发明主要解决的技术问题是提供一种转换接口及液晶显示器检测系统，能够避免测试用信号源上低压差分信号线外接接口的频繁插拔导致的信号源上接口的损坏。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种应用于液晶显示装置画面检查的转换接口，转换接口包括依次连接的第一接头、转接主体以及第二接头；其中，第一接头用于与测试用信号源的接口插接，第二接头用于与连接至液晶显示装置的连接线的接口插接，连接线是低压差分信号LVDS连接线；其中，转接主体包括静电防护电路。
其中，静电防护电路包括在转换接口中的信号线或电源线与地之间直接串联的瞬态电压抑制器，瞬态电压抑制器使转换接口中的信号线或电源线的电压保持在嵌位电压以下。
其中，第二接头为卡扣接头。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种应用于液晶显示装置画面检查的转换接口，转换接口包括依次连接的第一接头、转接主体以及第二接头；其中，第一接头用于与测试用信号源的接口插接，第二接头用于与连接至液晶显示装置的连接线的接口插接。
其中，转接主体包括静电防护电路。
其中，静电防护电路包括在转换接口中的信号线或电源线与地之间直接串联的瞬态电压抑制器，瞬态电压抑制器使转换接口中的信号线或电源线的电压保持在嵌位电压以下。
其中，连接线是低压差分信号LVDS连接线。
其中，第二接头为卡扣接头。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种液晶显示器检测系统，检测系统包括：测试用信号源、转换接口、低压差分信号线材以及液晶面板；其中，测试用信号源上设置有第一接口；转换接口包括依次连接的第一接头、转接主体以及第二接头，转接主体设置于转换接口的中间部分；低压差分信号线材的一端设有第二接口，另一端设有第三接口；液晶面板上设置有第四接口；其中，测试用信号源上的第一接口与转换接口的第一接头连接；转换接口的第二接头与低压差分信号线材的第二接口连接；低压差分信号线材的第三接口与液晶面板上的第四接口连接。
其中，转接主体中设有信号线和电源线，信号线或电源线与地之间直接串联一个瞬态电压抑制器。
其中，液晶面板是薄膜晶体管液晶显示面板。
其中，第二接头为卡扣接头。
本发明的有益效果是：区别于现有技术液晶显示器检测时，将测试用信号源与液晶面板通过低压差分信号线直接连接的情况，本发明在测试用信号源和连接至液晶显示装置的连接线之间增设转换接口，其中，转换接口包括依次连接的第一接头、转接主体以及第二接头，第一接头用于与测试用信号源的接口插接，第二接头用于与连接至液晶显示装置的连接线的接口插接，显然，本发明通过增加转换接口，连接至液晶显示装置的连接线无需直接和测试用信号源的接口直接插接，避免了测试用信号源上低压差分信号线外接接口的频繁插拔导致的接口损坏。
【附图说明】
图1是 现有技术中液晶显示器检测系统的结构示意图；
图2是 本发明液晶显示器检测系统一实施例的结构示意图；
图3是 本发明转换接口一实施例的静电防护电路图；
图4是 与图3中静电防护电路进行类比的二极管的特性曲线图；
图5是 本发明图3中瞬态电压抑制器的特性曲线图一；
图6是 本发明图3中瞬态电压抑制器的特性曲线图二。
【具体实施方式】
在传统的液晶显示器检测技术中，LVDS线材直接连接测试用信号源以及液晶面板（Panel）。在实际生产中，不同型号/类别的Panel需要匹配不同的LVDS线材，从而导致测试用信号源上低压差分信号线外接接口的频繁插拔，在接口插拔过程中不仅容易导致测试用信号源接口的物理损耗同时也会带来静电的产生，降低了测试用信号源的寿命。
本发明将插拔对象由LVDS接口与测试用信号源接口之间转变成为LVDS接口与转换接口之间。如图2所示，图2是本发明液晶显示器检测系统一实施例的结构示意图，液晶显示器检测系统包括：测试用信号源1、转换接口2、低压差分信号线材3以及液晶面板4。
其中，测试用信号源1上设置有第一接口17；转换接口2的两端分别设置有第一接头21和第二接头22，中间虚线部分设置有转接主体23，第一接头21、转接主体23以及第二接头22依次电连接；低压差分信号线材3的一端设有第二接口31，另一端设有第三接口32；液晶面板4上设置有第四接口41。
如图2所示，转换接口2包括依次连接的第一接头21、转接主体23和第二接头22，其中，第一接头21和第二接头22分别位于转换接口2的两端，转接主体23设置于转换接口2的中间部分。第一接头21用于与测试用信号源1的接口17插接，第二接头22用于与连接至液晶显示装置4的连接线3的接口31插接。
具体连接方式为，测试用信号源1上的第一接口17与转换接口2的第一接头21连接，转换接口2的第二接头22与低压差分信号线材3的第二接口31连接，低压差分信号线材3的第三接口32与液晶面板4上的第四接口41连接。
在其他应用中，第二接头22也可以为卡扣接头，则第二接头22与连接至液晶显示装置4的连接线3的接口31插接后，使用卡扣予以固定。
本发明通过增加转换接口2，可使得测试过程中更换Panel样品时只需要插拔转换接口与LVDS线材连接的一端，避免了测试用信号源1上低压差分信号线外接接口17的频繁插拔导致的接口损坏。
当更换Panel样品插拔LVDS线材发生接口损坏或静电破坏时只需更换转换接口即可，极大的提高了测试用信号源的使用寿命，且转换接口的成本远远低于测试用信号源的整机维修费，因此可减少插拔损耗的成本。
其中，液晶显示装置4包括薄膜晶体管液晶显示面板等。连接测试用信号源1与液晶显示装置4的连接线3为低压差分信号连接线。测试用信号源1为测试时提供各种电子信号的仪器。
现有技术测试用信号源11上的接口16与LVDS信号线13上的接口14在插拔作业过程中会产生一定的静电效应，静电释放（Electro-Static discharge，ESD）会对测试用信号源11中的芯片产生冲击，从而导致测试用信号源11的快速失效。
请参阅图3，图3是本发明转换接口一实施的静电防护电路图。转接主体23设有信号线以及电源线。为了实现ESD保护功能，如图3所示，在信号线或电源线与地（Gnd）之间直接串联一个瞬态电压抑制器（Transient Voltage Suppressor，TVS），In为电流的输入端，Out为电流的输出端，U（TVS）为线路的电压，其中，TVS管特性类似二极管特性。
请参阅图4，图4是与图3中静电防护电路进行类比的二极管的特性曲线图。如图4所示，VBR和IT分别为反向二极管击穿下的电压以及电流，Vc和Ipp分别为向二极管击穿后的嵌位电压以及允许的峰值电流。
TVS管实现稳压的具体过程，请参阅图5和图6，图5和图6均是本发明转换接口实施例中瞬态电压抑制器的特性曲线图。如图5所示，当通过TVS管的电流大小达到1mA时，TVS管处于反向击穿状态，此时由于雪崩效应，TVS管内阻急剧变小，电流直接从TVS管通过流向地，实现稳压。
如图6所示，曲线61表示TVS管的电流特性，通过TVS管的电流达到最大Ipp后将呈指数方式递减。曲线62表示TVS管的电压特性，加载在TVS管两端的电压稳定在嵌位电压Vc之下，从而保证线路的电压传输峰值不会超过Vc。
在具体操作过程中，当使用LVDS线材对转换接口和Panel进行连接产生静电时，由于TVS管两端经受瞬间的高能量冲击，其可以在1Ps（1*10-12S）的时间内使其内阻降低，使得绝大部分的电流得于通过导入地中，从而将TVS管两端电压钳制在Vc，从而保护线路中对测试用信号源电路的冲击，降低测试用信号源失效以及击坏的可能性。
综上所述，本发明改变测试用信号源与Panel直接用LVDS线材的连接方式，使用一个具有ESD保护功能的转换接口，可以减小插拔导致的静电对测试用信号源的破坏。
区别于现有技术液晶显示器检测时，将测试用信号源与液晶面板通过低压差分信号线直接连接的情况，本发明通过增加转换接口，将测试用信号源与LVDS线进行连接，更换Panel样品进行测试时，只需插拔转换接口与LVDS线连接的一端，避免了测试用信号源上低压差分信号线外接接口的频繁插拔导致的接口损坏。同时，由于增加的转换接口中，在信号线或电源线与地之间直接串联了一个TVS管，因此可减小插拔导致的静电对测试用信号源的破坏。
在其它实施例中，也可在信号线或电源线与地之间直接串联一个预定电压下可击穿的二极管，以替代前述的瞬态电压抑制器。二极管的负极连接信号线或电源线，正极连接地，也能防止静电对电子芯片的破坏。
以上所述仅为本发明的实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (12)

  1. 一种应用于液晶显示装置画面检查的转换接口，其特征在于：
    所述转换接口包括依次连接的第一接头、转接主体以及第二接头；
    其中，所述第一接头用于与测试用信号源的接口插接，所述第二接头用于与连接至液晶显示装置的连接线的接口插接，所述连接线是低压差分信号LVDS连接线；
    其中，所述转接主体包括静电防护电路。
  2. 根据权利要求1所述的转换接口，其特征在于：
    所述静电防护电路包括在转换接口中的信号线或电源线与地之间直接串联的瞬态电压抑制器，所述瞬态电压抑制器使所述转换接口中的信号线或电源线的电压保持在嵌位电压以下。
  3. 根据权利要求1所述的转换接口，其特征在于：
    所述第二接头为卡扣接头。
  4. 一种应用于液晶显示装置画面检查的转换接口，其特征在于：
    所述转换接口包括依次连接的第一接头、转接主体以及第二接头；
    其中，所述第一接头用于与测试用信号源的接口插接，所述第二接头用于与连接至液晶显示装置的连接线的接口插接。
  5. 根据权利要求4所述的转换接口，其特征在于：
    所述转接主体包括静电防护电路。
  6. 根据权利要求5所述的转换接口，其特征在于：
    所述静电防护电路包括在转换接口中的信号线或电源线与地之间直接串联的瞬态电压抑制器，所述瞬态电压抑制器使所述转换接口中的信号线或电源线的电压保持在嵌位电压以下。
  7. 根据权利要求4所述的转换接口，其特征在于：
    所述连接线是低压差分信号LVDS连接线。
  8. 根据权利要求4所述的转换接口，其特征在于：
    所述第二接头为卡扣接头。
  9. 一种液晶显示器检测系统，其特征在于：
    所述检测系统包括：测试用信号源、转换接口、低压差分信号线材以及液晶面板；
    其中，所述测试用信号源上设置有第一接口；转换接口包括依次连接的第一接头、转接主体以及第二接头，所述转接主体设置于所述转换接口的中间部分；低压差分信号线材的一端设有第二接口，另一端设有第三接口；液晶面板上设置有第四接口；
    其中，所述测试用信号源上的第一接口与转换接口的第一接头连接；所述转换接口的第二接头与低压差分信号线材的第二接口连接；所述低压差分信号线材的第三接口与液晶面板上的第四接口连接。
  10. 根据权利要求9所述的检测系统，其特征在于：
    所述转接主体中设有信号线和电源线，所述信号线或电源线与地之间直接串联一个瞬态电压抑制器。
  11. 根据权利要求9所述的检测系统，其特征在于：
    所述液晶面板是薄膜晶体管液晶显示面板。
  12. 根据权利要求9所述的检测系统，其特征在于：
    所述第二接头为卡扣接头。
PCT/CN2012/074233 2012-04-16 2012-04-18 转换接口及液晶显示器检测系统 Ceased WO2013155674A1 (zh)

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