Touch Detection Module with Drive-Signal Compensation for Process Deviations
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Solution Overview
Problem
Existing touch detection modules in display devices struggle with manufacturing process deviations and electrical signal transmission issues, leading to reduced touch sensing performance and increased defect rates.
Innovation Solution
A touch detection module with a touch sensing unit and inspection signal transmission line, where a touch driving circuit adjusts voltage magnitude and current amount of touch driving signals in real time to compensate for manufacturing and signal transmission deviations, enhancing touch sensing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If touch driving signals are supplied with fixed voltage magnitude and current amount, then device complexity is reduced, but touch sensing performance deteriorates due to manufacturing process deviations and signal transmission deviations
Solution Approach 1:
The touch driving circuit performs preliminary measurement of voltage magnitude and current amount of touch driving signals before actually driving the touch electrodes. Based on these measured values, the circuit pre-adjusts the signal parameters to compensate for anticipated manufacturing deviations and signal transmission losses, thereby improving touch sensing performance without requiring complex real-time adjustment mechanisms during touch detection
Solution Approach 2:
The touch driving circuit measures the actual voltage magnitude and current amount of touch driving signals and uses this feedback information to adjust subsequent signal parameters. This closed-loop feedback mechanism compensates for manufacturing process deviations and electrical signal transmission deviations, improving touch sensing performance while maintaining manageable device complexity through iterative optimization
2Measurement precision
If inspection signal transmission line is added to measure voltage magnitude and current amount, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The inspection signal transmission line is merged with the existing touch line structure, allowing the same physical infrastructure to serve dual purposes: transmitting touch driving signals to electrodes and carrying inspection signals for measuring voltage magnitude and current amount. This integration improves measurement precision while minimizing additional device complexity by reusing existing circuit pathways
Solution Approach 2:
The inspection signal transmission line performs multiple functions: it transmits inspection signals for measuring touch driving signal characteristics (voltage magnitude and current amount) and is integrated with the touch line structure for signal distribution. This multi-functionality approach improves measurement capability without proportionally increasing device complexity, as the same structural elements serve multiple purposes
Data Source
AI summary
A touch detection module includes a touch sensing unit and a touch driving circuit. The touch sensing unit includes touch electrodes and an inspection signal transmission line. The touch electrodes in a touch sensing area of the touch sensing unit connect to touch lines extending through a touch peripheral area of the touch sensing unit. The touch driving circuit supplies an inspection signal to the inspection signal transmission line and touch driving signals to the touch electrodes. The supplied touch driving signals depends on a voltage magnitude or a current amount of the inspection signal, wherein the touch driving circuit supplies the touch driving signals to the touch electrodes and detects touch sensing signals from the touch electrodes to detect coordinates of a touch location.