Touch Sensor Driving Circuit for Event-Triggered Display Sensing
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Solution Overview
Problem
Display apparatuses with touch interface processing face increased power consumption due to continuous sensor operation for non-temporary touch sensing, leading to higher processor load and potential sensing errors from environmental noise.
Innovation Solution
A sensor driving circuit and display apparatus that efficiently reduce processor load and power consumption by implementing a sensing channel connected with sensors, a sensor monitoring part to generate a sensing start signal based on the sensing signal, and a sensing part to sample the sensing signal and obtain sensing data only when a touch or pressure is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensors operate continuously for non-temporary touch sensing, then touch sensing capability is maintained, but power consumption increases
Solution Approach 1:
The sensor driving circuit performs sensing operations periodically rather than continuously. The controller activates sensors only at specific intervals or when triggered by certain conditions, allowing sensors to remain in a low-power state between sensing periods while still maintaining touch sensing capability when needed.
2Reliability
If sensors operate continuously for non-temporary touch sensing, then touch sensing capability is maintained, but processor load increases
Solution Approach 1:
The controller manages sensor operations periodically, activating sensors and processing data only when necessary rather than continuously. This reduces the computational burden on the processor while maintaining touch sensing functionality through scheduled or event-driven sensing operations.
3Use of energy by moving object
If sensing operation is reduced to decrease power consumption, then power consumption decreases, but sensing error from environmental noise increases
Solution Approach 1:
The sensor driving circuit incorporates feedback mechanisms where the controller monitors sensing signals and adjusts sensing operations accordingly. When environmental noise is detected or sensing quality degrades, the system can increase sensing frequency or activate additional sensors to maintain accuracy, while normally operating in a lower-power mode.
Data Source
AI summary
A sensor driving circuit includes a sensing channel connected with at least one sensor, a sensor monitoring part configured to receive a sensing signal from the sensing channel and generate a sensing start signal based on the sensing signal, and a sensing part sampling the sensing signal to obtain sensing data based on the sensing start signal.