Pixel structure and its repairing method

Abstract

A pixel structure comprises a standby thin film transistor and a working thin film transistor. A grid electrode or drain electrode of the standby thin film transistor is preserved as an independent metal electrode. When a bad pixel appears, the standby thin film transistor substitutes for the working thin film transistor, and then the bad pixel can be recovered as a normal pixel. The repairing method of the present invention is that: the drain electrode of the working thin film transistor with the bad pixel appearing is cut off from an electric pathway of a pixel electrode; the grid electrode of the standby thin film transistor is electrically connected with a scanning line or with the pixel electrode, so as to replace the working thin film transistor.

Description

technical field

[0001] The present invention relates to a pixel structure and its repairing method, in particular to a pixel structure and its repairing method for repairing bad pixels by using spare thin film transistors. Background technique

[0002] For pixel repair of TFT-LCD, a common method is to repair the bright spots of the pixels into permanent dark spots or micro-bright spots, but they are still permanent defect spots.

[0003] 11 is an equivalent circuit diagram of a known pixel structure, illustrating the circuit of a thin film transistor, wherein the gate 410 of the thin film transistor is electrically connected to the scan line 200, the source 420 is electrically connected to the data line 100, and the drain 430 is electrically connected to A pixel electrode 300 .

[0004] figure 2 It is an equivalent circuit diagram of permanent dark spot repair in the prior art. The drain 430 of the thin film transistor is short-circuited through the repair point 510 and e...

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