Thin Film Transistor Array Substrate Voltage Uniformity
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Solution Overview
Problem
In liquid crystal display (LCD) panels, voltage deviations across common electrodes due to different loads and factors lead to instability, which is addressed by adding multiple conductive electrodes, but this increases the black matrix area on the color filter substrate, reducing the aperture ratio and image quality.
Innovation Solution
A double-gate structure with two gate lines between adjacent rows of sub-pixel areas and a common electrode layer connected to each common electrode, ensuring uniform voltage application across the common electrode layer, reducing the need for additional conductive electrodes and minimizing the black matrix area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple conductive electrodes are added to the common electrodes to stabilize voltages, then voltage uniformity is improved, but the black matrix area increases and aperture ratio decreases
Solution Approach 1:
The patent combines the common electrode and conductive electrode functions into a single integrated common electrode structure with extended portions. This merging eliminates the need for separate conductive electrodes while maintaining voltage stabilization, thereby avoiding the increase in black matrix area that would reduce aperture ratio.
Solution Approach 2:
The patent extends the common electrode in the transistor gate direction (adding dimensional extension) to create extended portions that function as conductive electrodes. This dimensional change allows voltage stabilization without requiring additional electrodes that would increase black matrix area, thus preserving aperture ratio.
2Reliability
If multiple conductive electrodes are added to the common electrodes to stabilize voltages, then voltage uniformity is improved, but the black matrix area increases
Solution Approach 1:
The patent merges the common electrode and conductive electrode into a single integrated structure where the common electrode has extended portions that serve dual functions. This eliminates the need for separate conductive electrodes that would require additional black matrix coverage, thus reducing black matrix area while maintaining voltage uniformity.
Solution Approach 2:
The extended portions of the common electrode serve multiple functions: they act as both common electrodes for voltage application and as conductive electrodes for voltage stabilization. This multi-functionality eliminates the need for separate conductive electrodes, thereby reducing the black matrix area required.
3Reliability
If additional conductive electrodes are added, then voltage stability is improved, but device complexity increases
Solution Approach 1:
The patent combines the common electrode and conductive electrode into a single integrated structure, reducing the total number of electrode components. This merging simplifies the device structure while maintaining voltage stability, avoiding the increased complexity that would result from adding separate conductive electrodes.
Solution Approach 2:
The extended portions of the common electrode perform dual functions as both common electrodes and conductive electrodes. This multi-functionality reduces the number of separate components needed, thereby simplifying the overall device structure while maintaining voltage stability.
Data Source
AI summary
A thin film transistor array substrate includes an insulating substrate, a plurality of data lines, a plurality of common electrodes, and a common electrode layer. The insulating substrate defines a plurality of sub-pixel area arranged into a sub-pixel array including a plurality of rows and a plurality of columns. The plurality of data lines extend in a direction of the columns in the sub-pixel array. The plurality of common electrodes extend in the direction of the columns in the sub-pixel array. At least two of the plurality of data lines are between adjacent common electrodes of the plurality of common electrodes, and the plurality of common electrodes are applied with a same voltage. The common electrode layer is on the insulating substrate and the common electrodes are connected to different locations of the common electrode layer.