Touch Panel Frequency-Phase Scanning for Low-Power Touch Detection
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Solution Overview
Problem
Existing touch panels in power saving mode suffer from prolonged calculation times and high power consumption due to row-by-row scanning of touch electrodes.
Innovation Solution
Simultaneously sending touch drive signals to multiple touch areas with different frequencies and phases, allowing the sensing circuit to determine touch events more quickly and reduce interference between adjacent areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If row-by-row scanning is used in power saving mode, then the touch panel can determine touch events, but the calculation time is prolonged and power consumption increases
Solution Approach 1:
The patent merges the scanning of multiple touch areas into a single time interval by simultaneously sending drive signals to multiple non-adjacent touch areas. This combining of previously sequential operations into a parallel operation reduces the total calculation time and lowers power consumption while maintaining touch detection accuracy.
Solution Approach 2:
The patent employs periodic action by using different frequencies and phases for drive signals sent to different touch areas. Non-adjacent touch areas receive signals with the same frequency but different phases, allowing simultaneous scanning without interference. This periodic modulation enables efficient multiplexing of the sensing circuit across multiple touch areas.
2Productivity
If multiple touch drive signals are simultaneously sent to multiple touch areas, then calculation time is reduced, but signal interference may occur between adjacent areas
Solution Approach 1:
The patent segments the touch panel into groups where non-adjacent touch areas are scanned simultaneously while adjacent areas are scanned sequentially. By dividing the touch areas into such groups and applying different scanning strategies, the system achieves high-speed detection without signal interference between adjacent regions.
Solution Approach 2:
The patent applies local quality by assigning different scanning characteristics to different regions. Non-adjacent touch areas use simultaneous scanning with same frequency but different phases, while adjacent areas use sequential scanning. This localized differentiation of scanning quality prevents interference while maximizing detection speed in appropriate regions.
Data Source
AI summary
A touch panel and an operating method for the touch panel are provided. The touch panel includes touch areas and a sensing circuit. In a power saving mode, adjacent touch areas among the touch areas receive touch drive signals with different frequencies. At least two non-adjacent touch areas have the same frequency and different phases. The touch panel sends touch drive signals to the touch areas simultaneously within a time interval. The sensing circuit receives touch sensing signals from the touch areas in the power saving mode, and determines whether the touch panel is touched according to at least one of the touch sensing signals. The touch panel is controlled to enter a normal mode in response to the touch panel being touched.