Touch Panel Delay Compensation for Accurate Multi-Channel Sensing
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Solution Overview
Problem
Touch panel systems experience accuracy deterioration due to signal delays caused by distances between channels and environmental factors, leading to imprecise touch position determination, especially in larger display devices.
Innovation Solution
A touch panel system and method that includes a signal generator, channels for detecting touches, a sensing unit, a delay unit to adjust the reference signal based on calculated delay compensation values, and a controller to determine these values, ensuring accurate touch detection by compensating for signal delays caused by channel distances and environmental changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch panel system uses multiple channels to detect touch positions, then the touch detection coverage and multi-touch capability are improved, but the signal delay difference among channels deteriorates the touch accuracy
Solution Approach 1:
The patent applies parameter changes by adjusting the reference signal characteristics (phase, frequency, or time) for each channel based on its specific distance from the signal generator. This allows the system to maintain consistent measurement conditions across all channels despite their different positions, thereby resolving the accuracy deterioration caused by distance-related signal delays while preserving multi-channel touch detection capabilities
2Area of stationary object
If the display device size is increased, then the display area and user interface capabilities are improved, but the signal delay among channels deteriorates the touch accuracy
Solution Approach 1:
The patent implements local quality by applying different reference signal adjustments to different channels based on their local characteristics (distance from signal generator). Each channel receives a customized reference signal with appropriate phase, frequency, or time adjustments, allowing the system to maintain high touch accuracy across large display areas where uniform signal distribution would be insufficient
3Device complexity
If the reference signal is supplied to all channels simultaneously, then the system complexity is reduced, but the delay difference among channels deteriorates the touch position determination accuracy
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-adjusting the reference signal parameters (phase, frequency, or time) for each channel before the actual touch detection process. This preliminary adjustment compensates for the inherent distance-related delays, allowing all channels to operate with synchronized effective reference signals without requiring complex real-time adjustment mechanisms
Data Source
AI summary
A touch panel system includes a signal generator configured to generate a reference signal and one or more channels. Each of the channels comprises a sensing unit configured to sense a touch thereon to output a sensing signal indicative of the touch; and a delay unit configured to adjust the reference signal based on a delay compensation value to compensate delay of the reference signal caused by the difference of distance between the signal generator and the channel. Further, each of the channels comprises an operation unit configured to perform an operation on the sensing signal and the reference signal from the delay unit to produce an operation result representing difference between the sensing signal and the adjusted reference signal; and a controller configured to determine the delay compensation value of the delay unit in each channel based on the voltage signal from the operation unit.