Touch Assembly Electrode Intersections for Reporting Rate
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Solution Overview
Problem
The high impedance load of diamond-shaped driving and sensing electrodes in capacitive touch screens leads to a decrease in touch reporting rate, which is not conducive to meeting the requirement of increasing reporting speed.
Innovation Solution
A touch assembly with a first electrode having recessed portions and a second electrode with protrusions near their intersection, reducing the impedance of one electrode while maintaining the other's impedance low, thereby reducing the resistance-capacitance load and increasing the reporting rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If diamond-shaped driving electrode and sensing electrode are used, then touch sensitivity is improved, but impedance load increases leading to decreased reporting rate
Solution Approach 1:
The patent applies local quality by making the electrodes non-uniform: the driving electrode has recessed portions at intersections to reduce its impedance, while the sensing electrode has protrusions at intersections to reduce its impedance. This local modification at critical intersection points allows both electrodes to have low impedance without compromising overall touch sensitivity.
Solution Approach 2:
The patent employs asymmetry by giving the driving electrode and sensing electrode different geometries at their intersections. The driving electrode has recessed portions while the sensing electrode has protrusions, creating asymmetric structures that optimize the electrical characteristics of each electrode type while maintaining their functional roles.
2Adaptability or versatility
If diamond-shaped electrodes are used, then multi-touch function is supported, but scanning time increases due to large impedance load
Solution Approach 1:
The patent applies local quality by making the electrodes non-uniform: the driving electrode has recessed portions at intersections to reduce its impedance, while the sensing electrode has protrusions at intersections to reduce its impedance. This local modification at critical intersection points allows both electrodes to have low impedance without compromising overall touch sensitivity.
Solution Approach 2:
The patent changes the geometric parameters of the electrodes at their intersections. By introducing recessed portions in the driving electrode and protrusions in the sensing electrode, the electrical parameters (impedance) are improved, which directly reduces scanning time while preserving multi-touch capability.
Data Source
AI summary
A touch assembly and a touch display device are provided. The touch assembly includes a touch layer, the touch layer includes a plurality of touch units, and each of the touch units includes a first electrode disposed along a first direction and a second electrode disposed along a second direction. The first electrode is electrically insulated from the second electrode; wherein near an intersection of the first electrode and the second electrode, the first electrode includes at least one recessed portion, and the second electrode includes at least one protrusion mating with the at least one recessed portion.