Grid Touch Electrode Array Substrate for Display Panels
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Solution Overview
Problem
The existing array substrates for capacitive touch functions have a long charging time due to high resistance and large load capacitance, limiting the time available for both touch and display states to operate in a time division manner.
Innovation Solution
The array substrate design features touch electrodes with a grid shape formed by intersecting first and second sub-electrodes, reducing resistance and overlapping area with source electrodes and metals, thereby decreasing load capacitance and charging time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a planar common electrode made of transparent conductive material is used as the touch electrode, then the touch function can be achieved, but the resistance of the touch electrode becomes large
Solution Approach 1:
The touch electrode is divided into multiple sub-electrodes arranged in a grid pattern, where first sub-electrodes extend in a first direction and second sub-electrodes extend in a second direction intersecting the first direction. This segmentation reduces the resistance of the touch electrode while maintaining the touch function.
2Reliability
If the common electrode has a planar shape, then the touch electrode can be formed, but the overlapping area with source electrode and first metal becomes large, forming large load capacitance
Solution Approach 1:
The touch electrode is segmented into a grid of sub-electrodes, which reduces the overlapping area with the source electrode and first metal below the pixel electrode, thereby reducing the load capacitance.
Solution Approach 2:
The touch electrode transitions from a planar two-dimensional structure to a three-dimensional grid structure with sub-electrodes arranged in multiple directions, reducing the overlapping area with underlying conductive layers.
3Reliability
If the product of resistance and load capacitance is large, then the touch electrode can be formed, but the charging time of the touch driving signal becomes long
Solution Approach 1:
The touch electrode is segmented into multiple sub-electrodes, reducing both resistance and load capacitance, thereby reducing the charging time of the touch driving signal and enabling time-division operation of touch and display states.
Data Source
AI summary
An array substrate includes a plurality of data lines; a plurality of scanning lines intersecting the data lines to define pixel units; a plurality of pixel electrodes within the pixel units; and a plurality of touch electrodes having a grid shape and formed by a plurality of first sub-electrodes and a plurality of second sub-electrodes intersecting each other. Projections of the first sub-electrodes and the second sub-electrodes onto a layer containing the pixel electrodes are respectively located between adjacent pixel electrodes, or the first sub-electrodes and the second sub-electrodes are respectively located between adjacent pixel electrodes. The product of the resistance of the touch electrode and the load capacitance between the touch electrode, the source electrode and the first metal is reduced, which reduces the charging time of the touch driving signal and enables the touch state and the display state to operate in a time division manner.