Display Touch Sensing With Reference Electrodes for Noise Mitigation
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Solution Overview
Problem
Existing display devices face challenges in accurately sensing touch inputs due to noise interference from the display panel, which affects the precision of input detection.
Innovation Solution
The display device incorporates sensor electrodes and sub-electrodes, with a driver configured to sense inputs based on sensing signals from the electrodes and reference signals from the sub-electrodes, utilizing different sensing methods in active and blank periods to identify and mitigate noise, thereby enhancing input accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensor electrodes are used to detect touch inputs, then touch input sensing capability is provided, but noise interference from the display panel reduces measurement precision
Solution Approach 1:
A sub-electrode is introduced as an intermediary component between the sensor electrode and the display panel. The sub-electrode generates a reference signal that serves as a mediator to cancel out noise interference from the display panel, allowing the sensor electrode to accurately detect touch inputs despite the harmful noise factors
Solution Approach 2:
The driver circuit uses feedback from the sub-electrode to continuously monitor and compare signals. By comparing the signal from the sensor electrode with the reference signal from the sub-electrode, the system can identify and compensate for noise interference, improving measurement precision through feedback-based noise cancellation
2Area of stationary object
If multiple sensor electrodes are used to improve coverage, then sensing area is increased, but device complexity increases
Solution Approach 1:
The sensing area is segmented into multiple regions with sensor electrodes, while the sub-electrode structure is segmented to correspond with each sensor electrode. This segmentation allows the system to cover a large area through multiple sensor electrodes while managing complexity through modular, corresponding sub-electrode pairs that can be independently controlled
Data Source
AI summary
A display device includes a display panel having a first area and a second area; sensor electrodes in the first area and the second area; at least one sub-electrode in the first area and separated from the sensor electrodes; and a driver electrically connected to the sensor electrodes and the at least one sub-electrode, and configured to sense an input to the display panel based on a sensing signal received from the sensor electrodes and a reference signal received from the at least one sub-electrode.