Method for optically repairing point defect

Abstract

The invention provides a method for optically repairing point defect, which is used for optically repairing a point defect of a display panel. The method comprises the following steps: firstly, applying voltage to a display panel; secondly, detecting defect pixels; and thirdly, changing the alignment way of an alignment film where the defect pixels are located through optical alignment. According to the method, the alignment direction of the alignment film on a substrate of an LCD (liquid crystal display) is changed through the optical alignment, so that the alignment directions which are vertical to each other originally are same in directions; and when light passes through polarizers on two sides of the substrate with polarization axes in vertical distribution and the alignment films in the same alignment direction, the pixels are in dark state, so that the defects of bright pixels can be repaired.

Description

technical field [0001] The invention relates to a method for optically repairing point defects of a display panel. Background technique [0002] In the process of engineering manufacturing, point defects will inevitably appear in liquid crystal display devices due to process errors, foreign matter pollution and other reasons. Point defects are generally divided into bright spot defects and dark spot defects. In actual production, bright spot defects are the majority, and the human eye is more sensitive to bright spots. Therefore, dark spots are allowed at relatively high shipping levels, but bright spots are not allowed. The general method in the engineering repair of point defects is to repair bright point defects into dark point defects, but dark point defects are still point defects. In addition, if there are 3 or more consecutive bright spot defects or dark spot defects in the display area, the display will generally be judged as unqualified. Therefore, the commonly u...

AI Technical Summary

Problems solved by technology

[0005] Patent KR20080065748 uses laser to irradiate defective pixels to change the physical properties of the filter on it and reduce the light transmittance to repair bright spots. Bubbles and polarizer damage that may occur during repair must depend on the precise control of laser wavelength and time, so The method is complex and carries significant risks

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