TFT LCD Array Substrate Aperture Ratio via Drain Electrode Extension
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Solution Overview
Problem
Conventional TFT LCD array substrates face challenges in maximizing aperture ratio due to the occupation of pixel area by TFT components, and there is a need to enhance signal stability and reduce voltage jumping, while also providing a simple method for repairing defective pixels.
Innovation Solution
The solution involves overlapping the common electrode with a part of the drain electrode connected to the pixel electrode and forming light blocking bars as an integrated structure to increase the aperture ratio, enhance signal stability, and facilitate easy repair of defective pixels by fusing electrodes and gate lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drain electrode is located in the pixel area to connect with the pixel electrode, then the electrical connection is achieved, but the aperture ratio decreases due to the occupied pixel area
Solution Approach 1:
The patent extends the drain electrode in the vertical direction (along the data line) beyond the pixel area boundaries. By moving part of the drain electrode connection to the non-pixel area, the electrical connection function is maintained while reducing the occupation of pixel area, thus improving the aperture ratio.
2Ease of manufacture
If the common electrode and light blocking bars are formed as separate structures, then the manufacturing process is straightforward, but the signal stability decreases and voltage jumping occurs
Solution Approach 1:
The patent integrates the light blocking bars with the common electrode to form a unified structure. This merging eliminates the interface between separate structures, preventing voltage jumping and improving signal stability, while the light blocking function and common electrode function are simultaneously achieved.
3Reliability
If the TFT components occupy the pixel area, then the switching function is provided, but the aperture ratio is limited
Solution Approach 1:
The patent extracts part of the drain electrode from the pixel area and extends it to the non-pixel area along the data line direction. This extraction reduces the area occupied by TFT components within the pixel area, thereby increasing the aperture ratio while maintaining the complete switching function through the retained TFT structure.
Data Source
AI summary
A TFT LCD array substrate and manufacturing method thereof are provided. In the TFT LCD array substrate, a part of the drain electrode of the thin film transistor that is connected with the pixel electrode is overlapped with the common electrode that is formed to increase the storage capacity for the respective pixel area. The TFT LCD of the present invention increases the aperture ratio of the pixel area.