Display Panel Transistor Gate Stack for High Pixel Density
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Solution Overview
Problem
There is a need to develop a display panel with improved pixel density (PPI) and desirable display effect to meet the demands of advanced display technology.
Innovation Solution
The display panel incorporates a base substrate with first and second transistors, where the first transistor has a silicon active layer and the second transistor has an oxide semiconductor active layer. The transistors are designed with specific gate and channel region configurations to optimize pixel circuit and drive circuit performance, thereby enhancing PPI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display pixel density is increased to improve display quality, then the PPI value increases and display fidelity improves, but the transistor area occupation increases and circuit layout becomes more complex
Solution Approach 1:
The patent applies local quality by using different semiconductor materials (silicon for first transistor, oxide semiconductor for second transistor) in different regions of the pixel circuit. This allows each transistor to be optimized for its specific function: the silicon transistor provides high-speed switching for the switch transistor role, while the oxide semiconductor transistor provides low leakage current for the drive transistor role, thereby achieving high PPI without compromising circuit performance
Solution Approach 2:
The patent changes the material parameter of the semiconductor layer to resolve the contradiction. By selecting silicon material for the first transistor and oxide semiconductor material for the second transistor, the patent achieves different electrical characteristics (mobility, leakage current) that allow compact circuit design at high PPI while maintaining proper transistor functionality
2Reliability
If the transistor channel width-to-length ratio is optimized to improve transistor performance, then the transistor area increases, but the available pixel area decreases
Solution Approach 1:
The patent optimizes transistor performance within limited area by assigning different material qualities to different transistors. The silicon-based first transistor achieves high mobility with smaller area, while the oxide semiconductor second transistor achieves ultra-low leakage with appropriate area, allowing the pixel circuit to meet performance requirements without excessive area occupation
Solution Approach 2:
The patent uses composite material strategy by combining silicon material and oxide semiconductor material in the same pixel circuit. This composite approach allows the circuit to benefit from both material systems: silicon provides high-speed operation and oxide semiconductor provides low leakage, achieving superior overall performance in compact area
Data Source
AI summary
A display panel includes a base substrate, a first transistor and a second transistor. The first transistor and the second transistor are formed on the base substrate. The first transistor includes a first active layer, a first gate electrode, a first source electrode, and a first drain electrode. The first active layer includes silicon. The second transistor includes a second active layer, a second gate electrode, a second source electrode, and a second drain electrode. The second active layer includes an oxide semiconductor. A length of a channel region of the first transistor is L1. Along a direction perpendicular to the base substrate, a distance between the first gate electrode and the first active layer is D1. The first transistor further includes a third gate electrode. Along the direction perpendicular to the base substrate, a distance between the third gate electrode and the first active layer is D3, and D1<D3.