KR20110075467A - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

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Publication number
KR20110075467A
KR20110075467A KR1020090131922A KR20090131922A KR20110075467A KR 20110075467 A KR20110075467 A KR 20110075467A KR 1020090131922 A KR1020090131922 A KR 1020090131922A KR 20090131922 A KR20090131922 A KR 20090131922A KR 20110075467 A KR20110075467 A KR 20110075467A
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KR
South Korea
Prior art keywords
liquid crystal
data
crystal display
lines
display panel
Prior art date
Application number
KR1020090131922A
Other languages
Korean (ko)
Inventor
송상무
Original Assignee
엘지디스플레이 주식회사
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.)
Filing date
Publication date
Application filed by 엘지디스플레이 주식회사 filed Critical 엘지디스플레이 주식회사
Priority to KR1020090131922A priority Critical patent/KR20110075467A/en
Publication of KR20110075467A publication Critical patent/KR20110075467A/en

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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
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • 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
    • G02F1/13458—Terminal pads
    • 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
    • G02F1/136204—Arrangements to prevent high voltage or static electricity failures
    • 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
    • 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
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3685—Details of drivers for data electrodes
    • G09G3/3688—Details of drivers for data electrodes suitable for active matrices only

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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)
  • Liquid Crystal (AREA)

Abstract

PURPOSE: A liquid crystal display device is provided to increase the reliability of a product and to discharge voltage which remains in a liquid crystal panel. CONSTITUTION: A liquid crystal display panel(100) is arranged in a plurality of data lines and a plurality of gate lines. A gate driver offers a scan signal to a plurality of gate lines. A data driver supplies a data signal to a plurality of data lines. A test pad unit(150) is electrically connected to the non-display area of the liquid crystal display panel.

Description

Liquid crystal display device

The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device that can improve the reliability of the product.

The liquid crystal display device uses the optical anisotropy and polarization property of the liquid crystal. By artificially adjusting the orientation direction of liquid crystal molecules having directionality using polarization, light transmission and blocking are possible with optical anisotropy according to the alignment direction. .

The liquid crystal display device includes a lower substrate and an upper substrate, and forms a liquid crystal display panel with a liquid crystal layer formed between two substrates.

The lower substrate is formed of a transparent glass material and has a plurality of gate lines arranged in one direction with a predetermined distance thereon, a plurality of data lines arranged at regular intervals in a direction perpendicular to the gate line, and the gate line; A plurality of pixel electrodes formed in a matrix form in a pixel region defined by crossing data lines and a thin film transistor which is switched by a gate signal to transfer a data signal to each pixel electrode are formed.

The upper substrate is formed of a transparent glass material to form a black matrix to block light in portions other than the pixel region, R, G, and B color filters to express color, and a common electrode to implement an image.

The completed liquid crystal display panel performs a lighting test to detect signal line defects such as short and open signal lines and defective thin film transistors after the manufacturing process.

The lighting test may provide an electrical signal through an inspection pad formed on a lower substrate of the liquid crystal display panel to determine a defect of signal lines formed in the liquid crystal display panel. In this case, the test pad serves as an antenna for static electricity generated during the manufacturing process.

If the power of an auto probe device that supplies an electrical signal to the test pad is turned off during the lighting test of the liquid crystal display panel, the electrical signal provided to the signal line of the liquid crystal display panel cannot be discharged. It remains on the display panel and generates frame-like stains.

In addition, when the liquid crystal display device is released as a finished product (for example, a mobile phone), when the battery of the mobile phone is forcibly removed, a frame-like stain that appears during the lighting test may appear on the liquid crystal display panel. Recognition of product defects can reduce the reliability of the product.

An object of the present invention is to provide a liquid crystal display device that can improve the reliability of the product by discharging the voltage remaining on the liquid crystal display panel when the lighting test or the power is forcibly separated.

The liquid crystal display according to the exemplary embodiment of the present invention is divided into a display area and a non-display area, and includes a liquid crystal display panel in which a plurality of gate lines and a plurality of data lines are arranged, and a gate driver providing scan signals to the plurality of gate lines. And a data driver for supplying data signals to the plurality of data lines, and a test pad portion formed in a non-display area of the liquid crystal display panel and electrically connected to the plurality of gate lines and the plurality of data lines. The test pad unit may include: a plurality of test pads electrically connected to the plurality of gate lines and the plurality of data lines; one antistatic unit electrically connected to any one of the plurality of gate lines and data lines; It includes a common electrode electrically connected to the antistatic portion.

The liquid crystal display according to the present invention forms an antistatic portion at any one of an input portion and an output portion of an auto probe pad portion or a data line to quickly discharge voltage remaining on the liquid crystal display panel when a lighting test or a power is forcibly separated. The reliability of the product can be improved.

Hereinafter, embodiments according to the present invention will be described with reference to the accompanying drawings.

1 is a view showing a liquid crystal display device according to the present invention.

As shown in FIG. 1, the liquid crystal display according to the present invention crosses a plurality of gate lines GL1 to GLn and a plurality of data lines DL1 to DLm, and drives the liquid crystal cell Clc at an intersection thereof. Supplying data to the liquid crystal display panel 100 having the thin film transistor TFT formed therein, the gate driver 110 for supplying scan signals to the gate lines GL1 to GLn, and the data lines DL1 to DLm. A common voltage generator for supplying a common voltage Vcom to the data driver 120, the timing controller 130 controlling the gate driver 110, the data driver 120, and the liquid crystal display panel 100. 140.

The liquid crystal display panel 100 has a liquid crystal formed between two glass substrates, and a plurality of gate lines GL1 to GLn and a plurality of data lines DL1 to DLm cross each other on the lower glass substrate. The thin film transistor TFT formed at the intersection of the plurality of gate lines GL1 to GLn and the plurality of data lines DL1 to DLm is in response to a scan signal from the gate lines GL1 to GLn. The data from DLm is supplied to the liquid crystal cell Clc.

To this end, the gate electrode of the thin film transistor TFT is connected to the gate lines GL1 to GLn, and the source electrode is connected to the data lines DL1 to DLm. The drain electrode of the thin film transistor TFT is connected to the pixel electrode of the liquid crystal cell Clc.

In addition, a storage capacitor Cst is formed on the lower glass substrate of the liquid crystal display panel 100 to maintain the voltage of the liquid crystal cell Clc. The storage capacitor Cst may be formed between the liquid crystal cell Clc and the front gate line, or may be formed between the liquid crystal cell Clc and a separate common line.

On the upper glass substrate of the liquid crystal display panel 100, color filters of R, G, and B colors corresponding to each pixel area in which the thin film transistors TFT are formed, and the gate lines GL1 to GLn border each other. And a black matrix covering the data lines DL1 to DLm, the thin film transistor TFT, and the like, and a common electrode covering all of them.

The gate driver 110 supplies a plurality of scan signals to the plurality of gate lines GL1 to GLn in response to the gate control signal GCS from the timing controller 130. These multiple scan signals cause the multiple gate lines GL1 to GLn to be sequentially enabled for one horizontal synchronization signal. The gate driver 110 may include a plurality of gate driver integrated circuits.

The data driver 120 generates a plurality of pixel data voltages whenever any one of the gate lines GL1 to GLn is enabled in response to the data control signals DCS from the timing controller 130. And a plurality of data lines DL1 to DLm on the liquid crystal display panel 100. The data driver 120 may include a plurality of data driver integrated circuits.

The timing controller 130 may include synchronization signals Vsync and Hsync supplied from an external system (for example, a graphic module of a computer system or an image demodulation module of a television reception system, not shown) and data. The gate control signal GCS controlling the gate driver 110 and the data control signal DCCS controlling the data driver 120 are generated using the enable signal DE and the clock signal CLK.

In addition, the timing controller 130 arranges the image data Data input from an external system and supplies the sorted data to the data driver 120.

The common voltage generator 140 generates a common voltage Vcom using a power supply voltage Vdd applied from a power supply unit (not shown) to form the common voltage Vcom as a common electrode of the liquid crystal display panel 100. To supply.

The plurality of gate lines GL1 to GLn and the data lines DL1 to DLm arranged on the liquid crystal display panel 100 are inspected for defects using an auto probe device.

An inspection pad unit receiving an electrical signal from an auto probe device in the non-display area of the liquid crystal display panel 100 to provide the gate lines GL1 to GLn and the data lines DL1 to DLm. Not shown) is formed.

FIG. 2 is a schematic view of the liquid crystal display panel of FIG. 1.

1 and 2, the liquid crystal display panel 100 defines a pixel area by arranging a plurality of gate lines GL and a plurality of data lines DL. A thin film transistor TFT is formed at a portion where the gate line GL intersects the data line DL, and the thin film transistor TFT is electrically connected to the pixel electrode 160.

The plurality of gate lines GL and the plurality of data lines DL are electrically connected to the inspection pad unit 150 used in the inspection process.

The third test pad unit 150 includes a plurality of test pads 150_1, 150_2, 150_3, 150_4... 150_n electrically connected to each of the plurality of gate lines GL and the plurality of data lines DL.

In addition, the test pad unit 150 may include an antistatic unit 170 and the antistatic unit 170 that are electrically connected to any one of the test pads 150_1, 150_2, 150_3, 150_4. And a common electrode 180 electrically connected to the common electrode 180.

For convenience, the antistatic unit 170 will be described as being electrically connected to the fourth test pad 150_4 of the test pad unit 150. In this case, the antistatic unit 170 may be a diode or a resistor having one end electrically connected to the fourth test pad 150_4 and the other end electrically connected to the common electrode 180.

The plurality of test pads 150_1, 150_2, 150_3, 150_4... 150_n of the test pad unit 150 may include an auto probe for defect or visual inspection of the plurality of gate lines GL and data lines DL. (Not shown) to open with the probe pin of the device.

As a result, an electrical signal of the auto probe device is applied to the plurality of gate lines GL and data lines DL through the plurality of test pads 150_1, 150_2, 150_3, 150_4. In addition, the output from the liquid crystal display panel 100 may be read by an auto probe device.

Power of the auto probe device during the inspection of defects of the plurality of gate lines GL and data lines GL arranged on the liquid crystal display panel 100 using an auto probe device. When the abrupt turn off occurs, electrical signals applied to the plurality of test pads 150_1, 150_2, 150_3, 150_4... 150_n are introduced into the common electrode 180 through the antistatic unit 170.

As a result, even when the power of the auto probe device is turned off, the electrical signals applied to the gate line GL and the data line DL of the liquid crystal display panel 100 are shared by the antistatic unit 170. The defects of the signal lines flowing into the electrode 180 and arranged on the liquid crystal display panel 100 can be prevented.

3 is a diagram illustrating a case in which the antistatic part of FIG. 2 is positioned at an input terminal of a data line of a liquid crystal display panel.

2 and 3, in the liquid crystal display panel 100, a plurality of gate lines GL and a plurality of data lines DL are arranged to define a plurality of pixel regions. A thin film transistor TFT is formed at an intersection where the gate line GL and the data line DL intersect, and the thin film transistor TFT is electrically connected to the pixel electrode 160. The common electrode 280 is formed in the non-display area of the liquid crystal display panel 100.

One antistatic unit 270 is formed between the common electrode 280 and the data line DL, and the antistatic unit 270 is electrically connected to one data line of the plurality of data lines DL. Connected. For convenience, the common electrode 280 is described as being positioned between the second data line DL and the common electrode 280 of the plurality of data lines DL.

In this case, the antistatic unit 270 may be a diode or a resistor having one end electrically connected to the fourth test pad 150_4 and the other end electrically connected to the common electrode 180.

When a scan signal is provided to the gate line GL of the liquid crystal display panel 100 and the thin film transistor TFT is turned on, a data signal is provided to the data line DL to provide the pixel electrode. The data signal is supplied to the 160 to display an image corresponding to the data signal on the liquid crystal display panel 100.

The data signal provided to the data line DL of the liquid crystal display panel 100 in which the liquid crystal display panel 100 is suddenly turned off flows into the common electrode 280 through the antistatic portion 270. do.

As a result, even when the LCD panel 100 is turned off, the data signal provided to the data line DL flows into the common electrode 280 through the antistatic unit 270 and the liquid crystal. Display failure due to data remaining in the display panel 100 can be prevented. The antistatic unit 270 may also be located at an input terminal of the data driver 120 of FIG. 1 to apply a data signal to the data line DL.

As described above, the liquid crystal display device according to the present invention forms one antistatic part in any one of an output part and an input part of a test pad part or a data line, and thus, when the lighting test or power is forcibly separated from the liquid crystal display panel. The remaining voltage can be discharged quickly to improve the reliability of the product.

Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely exemplary and will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. . Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1 is a view showing a liquid crystal display device according to the present invention.

FIG. 2 is a schematic view of the liquid crystal display panel of FIG. 1; FIG.

3 is a diagram illustrating a case in which the antistatic part of FIG. 2 is positioned at an input terminal of a data line of a liquid crystal display panel.

<Brief description of the main parts of the drawing>

100: liquid crystal display panel 110: gate driver

120: data driver 130: timing controller

140: common voltage generator 150: test pad unit

150_1 to 150_n: multiple test pads 160: pixel electrodes

170, 270: Antistatic unit 180, 280: Common electrode

Claims (4)

A liquid crystal display panel divided into a display area and a non-display area and having a plurality of gate lines and a plurality of data lines arranged thereon; A gate driver providing a scan signal to the plurality of gate lines; A data driver for supplying data signals to the plurality of data lines; And And a test pad part formed in the non-display area of the liquid crystal display panel and electrically connected to the plurality of gate lines and the plurality of data lines. The test pad unit may include a plurality of test pads electrically connected to the plurality of gate lines and a plurality of data lines, and one antistatic electrode electrically connected to any one signal line among the plurality of gate lines and the plurality of data lines. And a common electrode electrically connected to the antistatic portion. The method according to claim 1, And the antistatic portion is formed between the data driver and the plurality of data lines on the non-display area and electrically connected to any one of the plurality of data lines. The method of claim 2, And the antistatic portion is electrically connected to the common electrode. The method according to claim 1, The antistatic unit is a liquid crystal formed between an input unit for providing data to the data driver from the outside on the non-display area and the data driver and electrically connected to any one input channel of the input channel of the data driver. Display.
KR1020090131922A 2009-12-28 2009-12-28 Liquid crystal display device KR20110075467A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180118854A (en) * 2017-04-21 2018-11-01 삼성디스플레이 주식회사 Display module and display module testing method
CN109872667A (en) * 2019-03-28 2019-06-11 惠科股份有限公司 Signal detection system and display device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180118854A (en) * 2017-04-21 2018-11-01 삼성디스플레이 주식회사 Display module and display module testing method
CN109872667A (en) * 2019-03-28 2019-06-11 惠科股份有限公司 Signal detection system and display device

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