Touch Panel Controller Two-Edge Detection Mode
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Solution Overview
Problem
Touch panels with larger sizes and higher electrode densities face challenges in achieving required integration signal amounts within shorter detection times, especially when combined with liquid crystal panels, leading to reduced accuracy and longer detection times.
Innovation Solution
Implementing a two-edge detection mode in the touch panel controller, where signals from detection electrodes are accumulated in synchronization with both rising and falling edges of the drive pulse, allowing for increased signal accumulation and reduced detection time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of drive pulse changes is increased to achieve required integration signal amount, then the integration signal amount is improved, but the detection time is elongated in proportion
Solution Approach 1:
The patent applies periodic action by utilizing both rising and falling edges of the drive pulse for signal accumulation. Instead of using only one edge (single-period), the system accumulates signals at both edges (double-period), effectively doubling the signal accumulation rate within the same detection time window, thus resolving the contradiction between signal amount and detection time
Solution Approach 2:
The patent implements continuity of useful action by continuously accumulating signals at both rising and falling edges throughout the entire drive pulse cycle. This eliminates idle periods where only single-edge detection would occur, maximizing the utilization of available time for signal accumulation and thereby reducing detection time while maintaining required signal amounts
2Manufacturing precision
If the electrode density of touch panel is increased to achieve larger size and higher resolution, then the touch panel size and resolution are improved, but the time allowed for detection with each electrode is shortened
Solution Approach 1:
By utilizing both rising and falling edges of the drive pulse for signal accumulation, the patent effectively doubles the signal accumulation rate. This allows high-resolution touch panels with increased electrode density to achieve required signal amounts within shorter detection time windows, thereby resolving the contradiction between resolution and detection time per electrode
3Manufacturing precision
If the gradation level of liquid crystal panel is increased to improve display quality, then the display quality is improved, but the time for display action is elongated, which further shortens the time allowed for touch panel detection
Solution Approach 1:
The patent utilizes both rising and falling edges of the drive pulse for signal accumulation, effectively doubling the signal accumulation rate within the same time window. This allows the system to maintain high display quality with increased gradation levels while still achieving required touch detection signal amounts within the reduced time available for detection
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
The two-edge detection mode enhances touch detection speed and accuracy by doubling the number of signal accumulations for the same detection time, while maintaining noise resistance and compatibility with high-resolution liquid crystal panels.
Implementation Method 1
drive electrodes and detection electrodes are arranged to intersect with each other at e.g. right angles with dielectric interposed therebetween; the cross-coupling capacitance of each intersection makes a node capacitance. When a capacitance produced by a finger or hand arises in the vicinity of each node capacitance, the mutual capacitance of the node decreases
Data Source
AI summary
The touch panel controller is connected with a touch panel having a plurality of drive electrodes, a plurality of detection electrodes, and a plurality of capacitance components formed at intersections of the drive and detection electrodes. A two-edge detection mode is adopted for the touch panel controller, in which signals arising on each detection electrode in synchronization with rising and falling edges of a drive pulse output to the drive electrodes, and alternately changing in polarity are accumulated in the integration circuit in terms of absolute value components. The integration circuit switches the connection of the integration capacitance between an input and an output before the drive pulse edge changing. The touch panel controller contributes to the shortening of the time for touch detection by the touch panel and the increase of the accuracy of touch detection.