Active Device Array Substrate Shielding Pattern Capacitance Compensation
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Solution Overview
Problem
The high coupling capacitance caused by the disposition of a shielding pattern layer leads to issues such as crosstalk and excess loading, which negatively impact the aperture ratio of display panels.
Innovation Solution
The active device array substrate design includes a first shielding pattern layer overlapped with adjacent semiconductor pattern layers, allowing capacitance compensation between the semiconductor and shielding pattern layers, thereby alleviating crosstalk and improving the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shielding pattern layer is disposed under the semiconductor layer to reduce electric leakage, then the reliability of the active device is improved, but the coupling capacitance increases causing crosstalk and excess loading
Solution Approach 1:
The shielding pattern layer is segmented into different regions with different overlap configurations. Specifically, in the first pixel structure, the shielding pattern layer overlaps with the semiconductor pattern layer, while in the second pixel structure, the shielding pattern layer does not overlap with the semiconductor pattern layer. This segmentation allows different capacitance characteristics in different regions, enabling crosstalk compensation while maintaining electric leakage reduction.
2Reliability
If a shielding pattern layer is disposed under the semiconductor layer, then electric leakage is reduced, but the aperture ratio is reduced due to excess loading
Solution Approach 1:
Different pixel structures are assigned different local configurations of the shielding pattern layer. The first pixel structure has a shielding pattern layer that overlaps with the semiconductor pattern layer to provide strong shielding, while the second pixel structure has a shielding pattern layer that does not overlap to minimize capacitance. This local quality differentiation allows optimization of each pixel's performance characteristics.
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 design effectively reduces crosstalk and enhances the aperture ratio of display panels by compensating capacitance, leading to improved performance and reduced loading.
Implementation Method 1
the first shielding pattern layer is overlapped with the first semiconductor pattern layer and the second semiconductor pattern layer. The first shielding pattern layer is overlapped with the second data line and not overlapped with the first data line
Data Source
AI summary
An active device array substrate including a first scan line, a first data line, a second data line, a first active device, a first pixel electrode, a second active device, a second pixel electrode, and a first shielding pattern layer is provided. The first active device includes a first gate electrically connected to the first scan line, a first semiconductor pattern layer, a first source electrically connected to the first data line, and a first drain. The second active device includes a second gate electrically connected to the first scan line, a second semiconductor pattern layer, a second source electrically connected to the second data line, and a second drain. The first shielding pattern layer is overlapped with the first semiconductor pattern layer and the second semiconductor pattern layer. The first shielding pattern layer is overlapped with the second data line and not overlapped with the first data line.