Touch Control Chip Channel Switching for Detection Speed
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Solution Overview
Problem
Capacitive touch screens face inefficiencies in touch detection due to the limited number of sensing channels that can be sampled at one time, leading to increased detection time, which affects refresh rate and user experience.
Innovation Solution
A touch control chip method that switches N driving channels to N sensing channels and K sensing channels to K driving channels, allowing for the collection of sensing signals from M−K and N sensing channels in two phases, reducing detection time by optimizing channel utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the number of sensing channels per sampling is limited by the original sensing channels, then the touch detection time increases, but the detection completeness is improved
Solution Approach 1:
The patent divides the sensing channels into two groups: original sensing channels and switched sensing channels. By segmenting the channel sampling into phases (first phase samples M-K channels, second phase samples K channels after switching), the system achieves complete detection of all M sensing channels while reducing the number of driving channel repetitions needed, thereby decreasing touch detection time without compromising detection completeness.
2Reliability
If driving channels are repeated multiple times to sample all sensing channels, then detection completeness is improved, but detection speed deteriorates
Solution Approach 1:
The patent dynamically switches the configuration of sensing channels during the detection process. In the first phase, M-K sensing channels are sampled while driven by N driving channels. In the second phase, K sensing channels are switched to become driving channels, and the original N driving channels are switched to become sensing channels. This dynamic switching enables complete detection of all M sensing channels in two phases instead of requiring multiple repetitions, significantly improving detection speed while maintaining completeness.
Data Source
AI summary
The present disclosure discloses a touch detection method which includes: inputting, by a driving unit, driving signals to N driving channels, respectively; receiving, by a sensing unit, sensing signals output by M−K sensing channels; switching, by a switching unit, the N driving channels to N sensing channels, and switching other K sensing channels to K driving channels; inputting, by the driving unit, driving signals to the K driving channels after the switching, respectively; receiving, by the sensing unit, sensing signals output by the N sensing channels after the switching; and determining, by a processing unit, touch information according to the sensing signals output by the M−K sensing channels and the sensing signals output by the N sensing channels after the switching. Therefore, time consumption is reduced and a detection speed of touch detection is improved in a case where sensing channels sampled at one time are insufficient.