Array Substrate Touch Electrode Segmentation for Signal Processing Speed
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Solution Overview
Problem
Current TDDI products face issues such as a large number of touch channels, weak anti-noise capability, slow processing speed of touch signals, and delays during rapid touch operations like line drawing due to the self-capacitance sensing principle, leading to 'ghost points' and slower signal processing.
Innovation Solution
The array substrate design includes touch electrodes, driving electrodes, sensing electrodes, driving leads, sensing leads, and driving connecting lines, where the sensing electrodes are insulated from driving electrodes, and the driving leads are connected to driving electrodes in a one-to-one manner, with sensing leads connected to sensing terminals and driving connecting lines having branches that reduce the number of pins and enable simultaneous signal input, improving touch accuracy and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If self-capacitance sensing principle is used in TDDI, then touch operation can be implemented, but processing speed becomes slow and ghost points occur
Solution Approach 1:
The patent divides the touch sensing function into separate driving electrodes and sensing electrodes, with driving electrodes responsible for signal output and sensing electrodes responsible for signal input. This segmentation allows independent optimization of each electrode type, enabling faster processing speed without sacrificing touch accuracy, thereby resolving the contradiction between speed and reliability in self-capacitance sensing.
2Adaptability or versatility
If number of touch channels is increased, then touch coverage is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple driving leads that connect to driving electrodes in the same row into a single common first branch. This merging reduces the number of separate connections required, thereby decreasing device complexity and pin count while maintaining comprehensive touch channel coverage across the display area.
Solution Approach 2:
The first branch serves as a universal connection structure that can simultaneously connect to multiple driving leads in the same row. This multi-functional design allows a single structure to handle multiple connections, reducing overall device complexity while maintaining full touch channel functionality.
3Area of stationary object
If touch electrode size is reduced, then display area is increased, but touch sensitivity decreases
Solution Approach 1:
By segmenting the touch sensing function into separate driving and sensing electrodes, the patent enables smaller electrode sizes while maintaining sensitivity. The specialized sensing electrodes can be optimized for sensitivity even at reduced sizes, allowing increased display area without sacrificing touch accuracy.
Data Source
AI summary
An array substrate, a driving method thereof, and a display panel. The array substrate includes a plurality of touch electrodes, including driving electrodes and sensing electrodes; a plurality of driving leads electrically connected with the driving electrodes in a one-to-one corresponding manner; a plurality of sensing leads, where the sensing electrodes in a same column are electrically connected with sensing lead terminals in a non-display area through the same sensing lead, the driving leads electrically connected with the driving electrodes in a same row are electrically connected with the same first branch, and the driving leads electrically connected with the driving electrodes in different rows are electrically connected with the different first branches.