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Liquid crystal display, testing method thereof and manufacturing method thereof

a technology of liquid crystal display and test pad, which is applied in the direction of identification means, instruments, measurement devices, etc., can solve the problems of increasing the difficulty of vi test, increasing the resistance of wires, and insufficient room for test wires and test pads

Inactive Publication Date: 2010-12-02
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This configuration provides enhanced space for the LCD design while maintaining accurate signal transmission and inspection capabilities, reducing signal interference and improving the reliability of visual inspection tests.

Problems solved by technology

However, rooms for the test wire and test pad is becoming insufficient since the size of an LCD is tried to be reduced, and accordingly difficulty in VI test is increasing.
The alteration of signal wire for VI test may cause lengthening of lines in signal wire and increasing of wire resistance, and accordingly, may adversely influence normal signal transmission.
Time delay that is increased due to distance between the gate line and the test pad may also deteriorate accuracy of the VI test.

Method used

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  • Liquid crystal display, testing method thereof and manufacturing method thereof
  • Liquid crystal display, testing method thereof and manufacturing method thereof
  • Liquid crystal display, testing method thereof and manufacturing method thereof

Examples

Experimental program
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first embodiment

[0130]In addition, the shorting bar 320 and the gate driving signal wire 321,136, 137, and 138 are formed as the same layer as the data wire 171, 173, 175, 176, and 179 but they are formed as the same layer as the gate wire 121, 124, and 129 according to this embodiment. Therefore, the connecting portions 122 directly interconnect the gate driving signal lines 321 and the gate pads 129 without an additional connecting member. Meanwhile, the auxiliary data pad 97 is elongated to interconnect the data pad 179 and the shorting bar 320.

[0131]In other words, the shorting bar 320 and the gate driving signal wire 321, 136, 137, and 138 are interposed between the substrate 110 and the gate insulating layer 140, and contact holes 184 and 185 that expose the gate driving signal wire 137 and 138 are formed through the protective layer 180 and the gate insulating layer 140. In addition, the contact hole 188 that exposes the shorting bar 320 is formed through the protective layer 180 and the ga...

second embodiment

[0141]According to a tested LCD of the present invention, all the gate lines are connected to one gate driving signal line 321 that has two pads 137 and 138, as shown in FIG. 8. For comparison, an LCD of the prior art as described with reference to FIG. 10 is prepared and tested.

[0142]The gate test signal of the waveform Al shown in FIG. 11 is applied to the same position as was in the case of FIG. 10, and output waveforms are also observed at the same position as was in the case of FIG. 10. Regarding LCDs according to embodiments of the present invention, waveform A2 is observed from an LCD of separate wire type, and waveform A3 is observed from an LCD of previous gate type. Waveform A4 is observed from an LCD of the prior art.

[0143]As shown in FIG. 11, output waveforms A2 and A3 according to embodiments of the present invention show less delay and reduction in output signal than the output waveform A4 according to the prior art.

[0144]The same VI test process as described above can...

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Abstract

A test method of a liquid crystal display device includes driving pixel electrodes through a plurality of switching elements by applying a first test signal to a first pad and a second test signal to a second pad, and cutting a connection between a driving signal wire and a first display signal wire. The liquid crystal display device includes a first display signal wire having a plurality of a first display signal lines, a second display signal wire having a plurality of a second display signal lines that cross the first display signal lines, a plurality of switching elements each of which is connected to both of one of the first display signal lines, pixel electrodes connected to the switching elements, and a driving signal wire including first and second pads respectively connected to the first display signal wire at a near end thereof and at an intermediate portion thereof.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a divisional application of U.S. application Ser. No. 10 / 646,008 filed Aug. 23, 2003, which claims priority to and the benefit of Korean Patent Application No. 2002-0050134 filed on Aug. 23, 2002, all of which are incorporated by reference herein in their entiretyBACKGROUND OF THE INVENTION[0002]a) Field of the Invention[0003]The present invention relates to a liquid crystal display (LCD), a testing method thereof and a manufacturing method thereof.[0004]b) Description of Related Art[0005]Liquid crystal displays (LCDs) are the most commonly used flat panel displays (FPDs) handy to carry.[0006]A typical liquid crystal display (LCD) includes a pair of panels having field-generating electrodes and polarizers, and a liquid crystal layer having dielectric anisotropy, which is interposed between the two panels and subject to electric field generated by the electrodes. The variation of the field strength changes molecular ori...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01R31/26G02F1/13G02F1/133G02F1/1345G02F1/1362G02F1/1368G09F9/00G09F9/30
CPCG02F1/1345G02F2001/136272G02F2001/136254G02F1/136286G02F1/136254G02F1/136272G02F1/13
Inventor MOON, SUNG-JAE
Owner SAMSUNG ELECTRONICS CO LTD