Display Controller Phase Compensation for Touch Interference
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Solution Overview
Problem
Display devices face interference issues due to the operation of input sensors, which can degrade the reliability and quality of the image displayed on the panel.
Innovation Solution
A display device with a controller that transmits input scanning signals to scanning electrodes and compensating signals to sensing electrodes, with the compensating signal having a phase different from the input scanning signals, to minimize interference and maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an input sensor is operated to sense external input on the display panel, then touch sensing capability is enabled, but interference is caused that degrades image quality and reliability
Solution Approach 1:
The patent applies preliminary anti-action by transmitting compensating signals to sensing electrodes before and during the input scanning signal transmission. These compensating signals are specifically designed to counteract the interference that will be generated by the input sensor operation, thereby preventing image quality degradation while maintaining touch sensing functionality
Solution Approach 2:
The patent converts the harmful interference generated by input sensor operation into a beneficial effect. By analyzing the interference pattern and transmitting compensating signals with opposite phase, the previously harmful interference is transformed into a cancellation effect that actually improves image quality by eliminating the distortion
2Ease of operation
If input scanning signals are transmitted to scanning electrodes for sensing external input, then touch detection function is achieved, but interference influences the displayed image
Solution Approach 1:
The patent introduces compensating signals as an intermediary element between the input scanning signals and the display system. These compensating signals act as a mediator that cancels out the harmful interference effects, allowing the input scanning signals to perform touch detection without adversely affecting the displayed image
3Reliability
If the controller transmits compensating signals with different phase to sensing electrodes, then interference is reduced, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the phase and amplitude parameters of the compensating signals transmitted to sensing electrodes. The controller adjusts these signal parameters dynamically based on the input scanning signal characteristics, enabling interference cancellation through parameter optimization rather than structural complexity
Data Source
AI summary
A display device includes a display panel that displays an image, an input sensor that senses an external input, and a sensing controller that controls the driving of the input sensor. The input sensor includes a plurality of scanning electrodes and a plurality of sensing electrodes. The sensing controller simultaneously transmits input scanning signals to at least two scanning electrodes of the plurality of scanning electrodes during a group scanning period. The group scanning period includes a plurality of scanning periods. The sensing controller transmits a compensating signal having a phase different from a phase of at least one of the input scanning signals to at least one sensing electrode of the plurality of sensing electrodes during at least one scanning period of the plurality of scanning periods.