Display Device Touch Detection Frequency Switching
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Solution Overview
Problem
Existing display devices face challenges in making the sensitivity of touch detection systems variable without causing image distortion, particularly when the touch detection period is changed to adjust sensitivity.
Innovation Solution
A display device with a touch detection system that selectively switches the scanning frequency of driving electrodes between two frequencies, allowing the capacity of video memory banks to remain fixed, enabling adjustable touch sensitivity without image distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch detection period is changed to adjust sensitivity, then touch detection sensitivity is improved, but image distortion occurs
Solution Approach 1:
The patent applies dynamics by making the scanning frequency of driving electrodes variable rather than fixed. The controller dynamically adjusts the scanning frequency between a first frequency and a second frequency based on touch detection requirements, allowing the system to adapt sensitivity without causing image distortion. This dynamic adjustment resolves the contradiction between improving touch detection sensitivity and maintaining image display accuracy.
Solution Approach 2:
The patent changes the parameter of scanning frequency from a fixed value to a variable parameter that can be adjusted between two frequencies. By changing this physical parameter, the system can optimize touch detection sensitivity at different times without affecting image quality, thus resolving the technical contradiction between measurement precision and manufacturing precision.
2Measurement precision
If the scanning frequency of driving electrodes is made variable to adjust touch sensitivity, then touch detection performance is improved, but device complexity increases
Solution Approach 1:
The controller dynamically switches between two fixed scanning frequencies based on operational requirements. This dynamic approach improves touch detection sensitivity when needed while maintaining simplicity by limiting the system to only two frequency states rather than continuous adjustment, thus balancing performance improvement with controlled complexity.
Solution Approach 2:
The system changes the scanning frequency parameter between two discrete values rather than implementing a continuous adjustment mechanism. This parameter change approach achieves variable touch sensitivity with relatively simple control logic, avoiding the complexity that would arise from more sophisticated frequency modulation schemes.
3Speed
If the scanning frequency is increased to improve touch detection response, then touch detection speed is improved, but image display stability deteriorates
Solution Approach 1:
The system dynamically adjusts scanning frequency based on operational mode: using a higher first frequency for improved touch detection response when touch interaction is needed, and switching to a lower second frequency for stable image display when touch detection is not required. This temporal separation of functions resolves the contradiction between speed and stability.
Solution Approach 2:
The controller employs periodic switching between two scanning frequencies, using the higher frequency periodically for touch detection enhancement and the lower frequency periodically for stable image display. This periodic action allows the system to achieve both fast response and stability at different time intervals, resolving the contradiction between speed and stability.
Data Source
AI summary
According to one embodiment, a pixel signal from a memory is supplied to an arbitrary pixel. A controller selectively switches a scanning frequency of common electrodes including a touch detection system, between a higher frequency and a lower frequency, and allocates banks in the memory, each bank having a capacity of a fixed number of items of the pixel data. The controller defines one unit including a group of lines of the pixel data, sets a line number of the one unit to the fixed number when the scanning frequency is the higher frequency, and sets the line number of the one unit to another line number which is greater than the fixed number when the scanning frequency is the lower frequency.