Capacitive Touch Device Boundary Line Segmentation for Frame Rate
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Solution Overview
Problem
In capacitive touch devices, the frame rate is significantly reduced due to the need for data transmission between adjacent touch ICs to determine the position of a touch, especially when using AI or APA capacitance sense technologies, which affects the performance of multi-point touch detection.
Innovation Solution
The capacitive touch device includes a touch panel with first and second sensing lines, where at least one first sensing line is electrically coupled to a second touch detection unit, and at least one second sensing line is coupled to a first touch detection unit, allowing for simultaneous scanning and calculation of touch positions without requiring data transmission between adjacent units, thereby maintaining a high frame rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ADC values of boundary sensing lines are transmitted between adjacent touch ICs to determine touch position, then touch position accuracy is improved, but frame rate is significantly reduced
Solution Approach 1:
The sensing lines are divided into first sensing lines and second sensing lines, with each type being scanned by dedicated touch ICs. Boundary sensing lines are shared between adjacent ICs, allowing each IC to independently process its portion of the sensing data without requiring inter-IC data transmission, thus maintaining high frame rate while ensuring accurate touch position detection.
2Adaptability or versatility
If multiple sensing lines are used to detect multi-point touch, then detection capability is improved, but sensing speed and calculation requirements increase
Solution Approach 1:
The touch detection system is segmented into multiple independent touch ICs, each responsible for scanning specific sensing lines. This segmentation allows parallel processing of touch detection across different regions, enabling multi-point touch detection without significantly reducing the overall sensing speed, as each IC operates independently on its assigned sensing lines.
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 configuration enables accurate multi-point touch detection without reducing the frame rate, improving the performance of capacitive touch devices by allowing both touch detection units to calculate touch positions independently, merging or averaging results for enhanced accuracy.
Implementation Method 1
a capacitive touch panel is applied to a large scale device, a number of sensing lines is increasing
Implementation Method 2
The first touch detection unit is electrically coupled to the first sensing lines. The second touch detection unit is electrically coupled to the second sensing lines.
Data Source
AI summary
A capacitive touch device and a sensing method thereof are disclosed. The capacitive touch device includes a touch panel and a plurality of touch detection units. The touch panel includes first sensing lines and second sensing lines. The position of a touch between a last one of the first sensing lines and a first one of the second sensing lines is calculated according to sensed values respectively corresponding to a first sensing line prior to the last one of the first sensing lines, the last one of the first sensing lines and the first one of the second sensing lines. The present invention is capable of avoiding the problem that the frame rate is reduced significantly because of the data transmission between the first and second touch detection units.