Touch Driving Circuit Compensation for Stable Display Touch Sensing
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Solution Overview
Problem
Existing touch detection modules in display devices face challenges in maintaining accurate touch detection due to variations in reference clock frequencies and voltage levels, leading to potential errors and reduced production yield.
Innovation Solution
A touch detection module that includes a touch driving circuit capable of varying frequency and voltage modulation parameters in response to changes in reference clock frequencies and voltage levels, ensuring consistent generation of touch driving signals through a reference clock generation unit, detection unit, data storage, and control unit, which adjusts the touch driving signals to maintain accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If reference clock frequency is used directly to generate touch driving signals, then the system is simple, but the touch detection accuracy deteriorates due to frequency variations
Solution Approach 1:
The patent implements a feedback mechanism where the actual frequency of the reference clock is measured and compared against a target frequency. Based on this comparison, the system adjusts the frequency modulation parameter of the touch driving signal to compensate for frequency deviations, thereby maintaining accurate touch detection despite variations in the reference clock frequency.
Solution Approach 2:
The patent dynamically changes the frequency modulation parameter of the touch driving signal based on the measured frequency of the reference clock. By adjusting this parameter in response to frequency variations, the system maintains consistent touch detection accuracy without requiring a perfectly stable reference clock frequency.
2Measurement precision
If frequency modulation parameter is adjusted to compensate for reference clock variations, then touch detection accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent employs a feedback control mechanism where the frequency of the reference clock is continuously monitored and compared to a target frequency. The difference between the actual and target frequencies is used to adjust the frequency modulation parameter of the touch driving signal, ensuring accurate touch detection while managing system complexity through a structured control approach.
Solution Approach 2:
The patent introduces a frequency measurement unit and a control unit as intermediary components between the reference clock and the touch driving signal generation. These intermediaries measure the reference clock frequency and adjust the touch driving signal accordingly, enabling accurate touch detection without directly coupling the touch driving to the unstable reference clock.
3Ease of manufacture
If touch driving signals are generated without frequency compensation, then the production process is simple, but the production yield decreases due to detection errors
Solution Approach 1:
The patent adjusts the frequency modulation parameter of the touch driving signal based on the measured reference clock frequency. This parameter adjustment compensates for frequency variations that would otherwise cause detection errors, thereby improving production yield without significantly complicating the manufacturing process.
Solution Approach 2:
The patent implements a feedback mechanism that measures the reference clock frequency and uses this information to adjust the touch driving signal frequency. This feedback approach reduces detection errors and improves production yield while maintaining a relatively simple production process through automated frequency compensation.
4Adaptability or versatility
If reference clock frequency varies, then adaptability to different operating conditions is improved, but touch detection reliability deteriorates
Solution Approach 1:
The patent dynamically changes the frequency modulation parameter of the touch driving signal in response to variations in the reference clock frequency. This parameter adjustment ensures that the touch driving signal frequency adapts to different operating conditions while maintaining consistent touch detection reliability through compensatory frequency modulation.
Solution Approach 2:
The patent uses a feedback mechanism to monitor the reference clock frequency and adjust the touch driving signal frequency accordingly. This feedback control enables the system to adapt to different operating conditions and reference clock frequencies while maintaining reliable touch detection through continuous frequency compensation.
Data Source
AI summary
A touch detection module, includes: a plurality of driving electrodes arranged side by side; a plurality of sensing electrodes staggered with respect to the driving electrodes; and a touch driving circuit configured to supply touch driving signals to the plurality of driving electrodes and to detect touch detection signals through the plurality of sensing electrodes to identify touch position coordinates, wherein the touch driving circuit is configured: to vary frequency modulation parameter set values in response to a change in a frequency of reference clocks, and to generate and supply a frequency of the touch driving signals by using the reference clocks and a varied frequency modulation parameter set value.