Display Touch Sensor Frequency Coordination for Reliable Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electronic devices face challenges in maintaining reliable touch sensing due to interference between display and sensor signals, leading to noise and reduced sensitivity in touch-based input mechanisms.
Innovation Solution
The electronic device employs a host processor to output signals at specific frequencies, including a first frequency for display data and a higher second frequency for sensor data, with overlapping and staggered transmit periods to minimize interference, and uses noise measurement techniques to select optimal frequencies, reducing noise and enhancing sensing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If display signals and sensor signals are transmitted simultaneously, then device operation is simplified, but signal interference increases causing noise and reduced sensing reliability
Solution Approach 1:
The patent implements periodic action by alternating between display signal transmission periods and sensor signal transmission periods. The host processor controls the display layer to transmit display signals during display periods and controls the sensor driver to transmit sensor signals during sensor periods, preventing simultaneous transmission and reducing interference. This periodic switching resolves the contradiction by maintaining operational simplicity while ensuring sensing reliability through temporal separation.
Solution Approach 2:
The patent applies segmentation by dividing the signal transmission timeline into distinct display periods and sensor periods. The one-shot register mechanism segments the transmission process, ensuring that either display signals or sensor signals are transmitted at any given time, but not both simultaneously. This segmentation eliminates signal interference while maintaining system functionality.
2Reliability
If noise measurement and frequency selection processes are implemented, then sensing reliability is improved, but processing time and system complexity increase
Solution Approach 1:
The patent implements self-service by having the host processor automatically perform noise measurement across multiple candidate frequencies and autonomously select the optimal frequency without external intervention. The one-shot register mechanism automatically manages the frequency selection process, reducing the need for complex external control systems. This self-service approach improves sensing reliability while minimizing the increase in system complexity.
Solution Approach 2:
The patent applies feedback by measuring noise levels at multiple frequencies and using this information to select the optimal frequency for transmission. The host processor receives feedback about noise characteristics and adjusts the transmission frequency accordingly, creating a closed-loop system that improves sensing reliability while managing complexity through automated feedback-based decision making.
Data Source
AI summary
An electronic device includes a host processor to output a first signal having a first frequency and a second signal having a second frequency higher than the first frequency and containing frame data, a driving controller configured to receive the frame data from the host processor and to generate image data, a display layer to display an image based on the image data, a sensor layer disposed on the display layer and including a plurality of sensing electrodes, and a sensor driver to provide a transmit signal having a third frequency to the plurality of sensing electrodes. The host processor determines the first frequency based on the third frequency.