Multi-channel Touch Screen Sampling Rate Optimization
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Solution Overview
Problem
Current touch screens face challenges in increasing resolution without increasing the number of infrared diodes, which affects response rate and costs, and off-axis scanning methods compromise response time due to interference light processing requirements.
Innovation Solution
A touch screen design that includes at least two infrared-receiving diodes receiving light from the same emitting diode, with first-stage processing circuits filtering out interfering signals and outputting them via a multiplexer to a second-stage processing circuit, optimizing circuit structure to enhance multi-channel sampling rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of infrared-receiving diodes is increased to improve resolution, then the resolution is improved, but the response rate deteriorates and the cost increases
Solution Approach 1:
Multiple infrared-receiving diodes share a single first-stage processing circuit through a multiplexer, combining processing resources to reduce the total number of processing circuits while maintaining the capability to handle signals from multiple receiving diodes simultaneously
Solution Approach 2:
The multiplexer performs periodic switching to sequentially connect different infrared-receiving diodes to the shared first-stage processing circuit, enabling time-multiplexed signal processing that maintains response rate while supporting multiple channels
2Measurement precision
If off-axis scanning is used to improve resolution without increasing the number of infrared diodes, then the resolution is improved, but the response time deteriorates due to interference light processing
Solution Approach 1:
The first-stage processing circuit extracts and removes interference light signals from the received signals before further processing, separating the harmful interference component from the useful touch detection signals to enable faster processing
Solution Approach 2:
Interference light filtering is performed as a preliminary action in the first-stage processing circuit before signals are passed to the second-stage processing circuit, eliminating the need for time-consuming interference removal later in the processing chain
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 approach increases the multi-channel sampling rate by reducing processing time and maintaining effective signal filtering, thereby improving touch screen performance without the need for additional infrared diodes.
Implementation Method 1
at least two infrared-receiving diodes receive infrared light emitted from the same infrared light-emitting diode simultaneously
Data Source
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AI summary
A touch screen and a multi-channel sampling method thereof are disclosed. The touch screen comprises infrared-emitting diodes, infrared-receiving diodes (102), a touch detection region, first-stage processing circuits, and a second-stage processing circuit (203). At least two infrared-receiving diodes receive infrared light emitted from the same infrared light-emitting diode simultaneously, and the at least two infrared-receiving diodes output the received signals to the second-stage processing circuit for processing after the first-stage processing circuits filter out interfering light signals. The touch screen and the multi-channel sampling method thereof according to the present invention can be used to increase the multi-channel sampling rate of the touch screen.