Touch Driving Circuit Phase Delay Detection
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Solution Overview
Problem
Current display devices require a separate quadrature amplitude modulation circuit to calculate the amplitude and phase of touch signals for recognizing touch inputs, which increases complexity and cost.
Innovation Solution
A touch driving circuit that calculates the phase delay of touch signals without a separate quadrature amplitude modulation circuit by detecting voltages at different cycles of touch sensing signals, allowing it to recognize touch inputs and determine touch positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate quadrature amplitude modulation circuit is used to calculate amplitude and phase of touch signals, then touch input recognition accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines the quadrature amplitude modulation circuit functions directly into the touch driving circuit, merging previously separate functions into a single integrated circuit. This eliminates the need for separate quadrature amplitude modulation circuits while maintaining touch signal detection accuracy, thereby reducing device complexity and cost.
Solution Approach 2:
The touch driving circuit is designed to perform multiple functions: it not only drives the touch panel but also calculates the amplitude and phase of touch signals through integrated quadrature amplitude modulation capabilities. This multi-functional design eliminates the need for separate dedicated circuits, reducing overall system complexity.
2Measurement precision
If a separate quadrature amplitude modulation circuit is used, then touch position calculation accuracy is improved, but manufacturing cost increases
Solution Approach 1:
By merging the quadrature amplitude modulation circuit into the touch driving circuit, the patent reduces the total component count and assembly requirements. This integration simplifies the manufacturing process and reduces production costs while maintaining accurate touch position calculation capabilities.
Solution Approach 2:
The integrated touch driving circuit performs both driving and signal processing functions, reducing the number of separate components that need to be manufactured and assembled. This multi-functional approach lowers manufacturing complexity and cost while preserving touch position detection accuracy.
3Device complexity
If the touch driving circuit detects voltages at different cycles, then the circuit complexity is reduced, but the processing time increases
Solution Approach 1:
The patent utilizes periodic sampling of touch signals at different cycles within the touch driving circuit. By strategically selecting sampling points at different cycles, the circuit can extract amplitude and phase information through voltage comparisons, achieving accurate touch detection with simplified circuitry while managing processing time through efficient periodic sampling.
Data Source
AI summary
A display device includes a display layer, a touch layer including a plurality of driving electrodes and a plurality of sensing electrodes, and a touch driving circuit supplying touch driving signals to the plurality of driving electrodes, receiving touch signals from the plurality of sensing electrodes, and generating a touch sensing signal including first and second touch sensing signals. The touch driving circuit receives one of the touch signals, detects first sensed voltages of the one touch signal every first cycle of the first touch sensing signal to calculate a phase delay amount of the one touch signal, delays a phase of the second touch sensing signal based on the phase delay amount, calculates second sensed voltages of the one touch signal every second cycle of the second touch sensing signal different from the first cycle, and recognizes a touch input based on the second sensed voltages.