TFT Array Substrate Common Voltage Uniformity
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Solution Overview
Problem
In touch display panels, the long electric lines connecting sub-electrodes to the driving circuit result in high resistance and capacitance loading, leading to poor common voltage uniformity and affected display functionality.
Innovation Solution
The implementation of a thin film transistor array substrate with a multi-layer structure, including a common electrode layer, controlling switches, and strategically arranged first and second lines, which reduce RC loading by applying voltages in a time division method, improving common voltage uniformity and display effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If long lines are used to electrically connect sub-electrodes away from the driving circuit, then the connection coverage is improved, but the resistance and capacitance loading increase resulting in poor common voltage uniformity
Solution Approach 1:
The patent introduces intermediate electrodes between the driving circuit and sub-electrodes, dividing the long connection lines into shorter segments. This segmentation reduces the cumulative RC loading effect while maintaining comprehensive connection coverage across the display panel.
Solution Approach 2:
The patent adds an intermediate electrode layer between the driving circuit layer and the sub-electrode layer, creating a multi-layer electrical connection structure. This dimensional addition allows for shorter individual connection paths while achieving the same overall coverage.
2Length of stationary object
If long lines are used to electrically connect sub-electrodes, then the connection reach is improved, but the RC loading increases affecting display function
Solution Approach 1:
By introducing intermediate electrodes, the patent segments the long connection paths into multiple shorter segments. This reduces the RC loading of individual connections while maintaining the overall connection reach across the display panel.
Solution Approach 2:
The intermediate electrodes serve as intermediary connection points between the driving circuit and sub-electrodes. This mediator approach reduces the direct connection length and associated RC loading while achieving the required connection reach.
3Device complexity
If traditional single-layer connection structure is used, then the device structure is simple, but the common voltage uniformity is poor
Solution Approach 1:
The patent transitions from a single-layer connection structure to a multi-layer structure by introducing an intermediate electrode layer. This dimensional change improves common voltage uniformity by reducing connection path lengths while adding manageable structural complexity.
Solution Approach 2:
The multi-layer structure segments the electrical connection paths through intermediate electrodes, improving voltage uniformity by reducing the length of individual connection segments while maintaining overall structural organization.
Data Source
AI summary
A thin film transistor array substrate in a touch display panel having reinforced common voltage uniformity on sub-electrodes therein includes a common electrode layer, a driving circuit, a controlling switch, a plurality of first lines, at least one second line, and at least one third line. The common electrode layer includes the spaced sub-electrodes. Each sub-electrode uses a first line electrically connect to the driving circuit and the controlling switch. The at least one second line is electrically connected to the driving circuit and the controlling switch, and when the controlling switch is turned on, the second line is electrically connected to the first lines, the driving circuit thus applying a common voltage to the sub-electrodes. A touch display panel using the thin film transistor array substrate is also provided.