Embedded Touch Array Substrate Common Voltage Uniformity
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Solution Overview
Problem
In capacitive touch screens, the difference in wiring resistances between driving and sensing electrodes leads to uneven common voltages, affecting display quality.
Innovation Solution
An array substrate with an embedded touch structure is designed, featuring a common electrode layer and a touch wiring layer with isolated first and second electrodes, connected through switches and thin film transistors, allowing for even common voltage distribution between driving and sensing electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If driving and sensing electrodes are formed on the same layer structure with metal wiring layers disposed above, then the touch screen structure is simplified, but the wiring resistance difference between driving and sensing electrodes increases causing uneven common voltages
Solution Approach 1:
The patent divides the common electrode into separate driving electrode regions and sensing electrode regions with independent wiring paths. The driving electrode connecting lines and sensing electrode connecting lines are routed through different paths in the metal wiring layer, allowing independent optimization of each path's resistance to achieve uniform common voltages across both electrode types.
2Adaptability or versatility
If driving and sensing electrodes time-sharing transmit common voltage and touch signal, then the electrode structure is integrated, but the wiring path difference causes larger potential difference between common voltages
Solution Approach 1:
The patent applies different wiring configurations to different regions of the electrode structure. The driving electrode connecting lines are routed through specific paths optimized for driving electrode coverage, while sensing electrode connecting lines use different paths optimized for sensing electrode coverage. This localized wiring optimization ensures that each electrode type receives uniform common voltage despite their integrated time-sharing function.
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 ensures even common voltages for driving and sensing electrodes, enhancing display quality and maintaining touch signal integrity.
Implementation Method 1
a first switching signal line controls the first switch and the second switch to turn on to respectively connect the first electrode connecting line and the second electrode connecting line to the common voltage signal line. In a touch sequence, the first switching signal line controls the first switch and the second switch to turn off to disconnect the first electrode connecting line and the second electrode connecting line and the common voltage signal line.
Data Source
AI summary
An array substrate having an embedded touch structure is disclosed. A common electrode layer is divided in to multiple first and second electrodes. Multiple first and second electrode connecting lines disposed in a touch wiring layer are respectively connected the first and second electrodes to a driving integrated chip one by one. A common voltage signal line, a first switching signal line and a first and second switches are disposed in a layout area. In a display sequence, the first switching signal controls the first and second switches to turn on, so the first and second electrode connecting lines are respectively connected to the common voltage signal line. In a touch sequence, the first switching signal controls the first and second switches to turn off to disconnect the first and second electrode connecting lines and the common voltage signal line. A display panel having the array substrate is also disclosed.