LCD Array Substrate Repair Pattern for Dead Pixel Restoration
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Solution Overview
Problem
Existing liquid crystal display (LCD) devices face issues with dead pixels due to static electricity or foreign materials, leading to noticeable bright or dark spots, which affect image quality and can only be partially repaired by changing dead pixels into dark points.
Innovation Solution
An array substrate design with a repair pattern that allows electrical connection between a dead pixel electrode and an adjacent pixel electrode through a second storage electrode, enabling the dead pixel to be driven like an active pixel, thereby improving image quality by addressing both bright and dark spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a dead pixel is repaired by changing it into a dark point, then the bright spot defect is improved, but the image quality is still degraded because dark spots are noticeable and the pixel remains non-functional
Solution Approach 1:
The patent uses a repair electrode as an intermediary component to restore electrical connection to the dead pixel. The repair electrode is positioned in the pixel electrode formation region and electrically connected to the pixel electrode through a contact hole, serving as a mediator to reactivate the non-functional pixel without requiring pixel electrode pattern reformation
Solution Approach 2:
The repair electrode and contact hole structure are prepared in advance during the manufacturing process, before defects are detected. This preliminary preparation enables quick repair activation without requiring additional fabrication steps after defect identification, allowing the dead pixel to be restored by simply applying voltage through the repair electrode
2Ease of manufacture
If traditional repair methods are used to change dead pixels into dark points, then the manufacturing process is simple, but additional fabrication processes are required and manufacturing costs increase
Solution Approach 1:
The patent merges the repair functionality with the existing pixel electrode structure by forming the repair electrode in the same region and using the same contact hole formation process. This integration allows the repair function to be added without requiring separate fabrication processes, maintaining manufacturing simplicity while improving efficiency
Solution Approach 2:
The repair electrode structure serves multiple functions: it acts as a normal pixel electrode during regular operation and as a repair mechanism when defects are detected. This multi-functionality eliminates the need for dedicated repair structures and processes, improving manufacturing efficiency without complicating the production flow
Data Source
AI summary
An array substrate for a liquid crystal display device includes a gate line and a first storage electrode on a substrate, a data line crossing the gate line to define a first pixel region, a thin film transistor connected to the gate line and the data line, a second storage electrode over the first storage electrode, a first pixel electrode in the first pixel region, the first pixel electrode connected to the thin film transistor and the second storage electrode, the second storage electrode including a first portion over the first storage electrode and a second portion in a second pixel region adjacent to the first pixel region, and a repair pattern for the first pixel region between the second storage electrode and a second pixel electrode in the second pixel region.