Pixel Structure Gate Electrode Aperture Ratio
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Solution Overview
Problem
Conventional electronic paper pixels with double-gate thin film transistors lack an indium tin oxide (ITO) layer on top, resulting in a large ITO gap and a low aperture ratio, leading to undesirable display effects.
Innovation Solution
A pixel structure is designed with a gate line, data line, first electrode, second electrode, and third electrode, where the second electrode has portions that form both a first and second thin film transistor on a single gate, effectively reducing the metal area occupied by the gate, thereby improving the aperture ratio and display effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two gates are used for double-gate thin film transistors, then the transistor control capability is improved, but the metal area occupied by gates increases, resulting in low aperture ratio
Solution Approach 1:
The patent merges two separate gates into a single shared gate structure that controls both thin film transistors. The gate line extends continuously to provide gate control for multiple transistor regions, reducing the total metal area occupied by gates while maintaining the dual-gate transistor control capability through a unified gate electrode design
Solution Approach 2:
The single gate structure serves multiple functions by controlling both the first thin film transistor (with first source and first drain) and the second thin film transistor (with second source and second drain). This multi-functional gate design eliminates the need for separate gates, thereby reducing metal area consumption while preserving reliable transistor control
2Ease of manufacture
If ITO layer is not covering the top of TFT, then the manufacturing process is simplified, but the ITO gap becomes large, causing low aperture ratio
Solution Approach 1:
The patent addresses the ITO gap issue by extending the gate line in the row direction beyond the conventional boundaries, creating an extended gate structure that spans across regions where ITO would normally be discontinuous. This dimensional extension of the gate structure allows the aperture ratio to improve without adding complex ITO layer processes
Data Source
AI summary
A pixel structure, an array substrate, a display panel and a display device. The pixel structure includes a gate line (10), a data line (20), a gate (30), a first electrode (40), a second electrode (50), and a third electrode (60); the gate (30) is connected to the gate line (10); the first electrode (40) is connected to the data line (20); and the second electrode (50) has a first portion and a second portion that are distributed in the extending direction of the second electrode, wherein the first portion of the second electrode (50) cooperates with the first electrode (40) and the gate (30) to form a first thin film transistor, and the second portion of the second electrode (50) cooperates with the third electrode (60) and the gate (30) to form a second thin film transistor.