Repairing Light Spot Defects in LCD Array Substrates
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Solution Overview
Problem
Defective manufacturing processes in liquid crystal panels often result in light spots due to TFT issues, leading to panel scrapping, and conventional methods to convert light spots into dark spots are not effective in resolving the problem.
Innovation Solution
A method involving a repairing process where a continuous common electrode is formed within a switch area and a pixel area, with a TFT, passivation layer, and through hole, allowing point welding of pixel and drain electrodes, cutting off the common electrode, and removing pixel electrodes above intersections to eliminate the storage capacitor, enabling light emission without it.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the conventional method of converting light spots into dark spots is used, then the quality of liquid crystal panel is improved, but the dark spot issue remains and cannot be fully resolved
Solution Approach 1:
The invention extracts and removes the storage capacitor component from the pixel structure by cutting off the common electrode. This eliminates the root cause of the light spot defect by preventing the storage capacitor from forming, rather than merely converting the visual appearance of the defect. The common electrode is selectively removed at specific intersections to disable the storage capacitor while maintaining display functionality.
Solution Approach 2:
The invention discards the storage capacitor component (by cutting the common electrode) to eliminate the light spot defect. The pixel is recovered to normal display function through alternative electrical connections, where the pixel electrode connects directly to the drain electrode, allowing the pixel to function without the defective storage capacitor structure.
2Ease of manufacture
If a continuous common electrode is formed across switch area and pixel area, then the storage capacitor is formed, but light spot defects occur and the panel may be scrapped
Solution Approach 1:
The continuous common electrode is segmented by cutting it at specific intersections between the switch area and pixel area. This segmentation disables the storage capacitor formation at defective pixels while maintaining the common electrode structure in non-defective areas. The cutting creates discrete sections that prevent the harmful light spot effect while preserving ease of manufacture for the overall structure.
3Reliability
If the pixel electrode is connected to the drain electrode via point welding, then the electrical connection is improved, but the storage capacitor remains and causes light spots
Solution Approach 1:
The storage capacitor is extracted from the circuit by cutting off the common electrode, eliminating the light spot defect. The point welding connection between pixel electrode and drain electrode is maintained for electrical functionality, but the harmful storage capacitor component is removed through selective cutting of the common electrode at the intersection areas.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method effectively repairs light spots by damaging the storage capacitor, allowing defective pixels to emit light, thus resolving the issue and preventing panel scrapping.
Implementation Method 1
connecting the pixel electrode and a drain electrode of the of the TFT via a point welding method; adopting laser to conduct the point welding method within the through hole to connect the pixel electrode and the drain electrode of the TFT
Implementation Method 2
cutting off the intersections of the main portion and each of the extended portion of the common electrode by laser such that the main portion and the main portion and each of the extended portions are independent from each other
Data Source
AI summary
A repairing method of defective pixels having light spots includes: connecting the pixel electrode and a drain electrode of the of the TFT via a point welding method; cutting off the continuous common electrode to divide the common electrode within the switch area and the common electrode within the pixel area; and removing the pixel electrode arranged above intersections of the common electrode, and connecting the pixel electrode within the switch area and the pixel electrode within pixel area. In addition, an array substrate and a liquid crystal panel are disclosed. By cutting off the common electrode within the pixel area switch area and the pixel area, the defective pixels having light spots are eliminated. In addition, such defective pixels are repaired to be pixels capable of emitting light normally.