Touch Electrode Phase Compensation for Low-Noise Display Panels
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Solution Overview
Problem
Display devices with touch panels experience noise and voltage fluctuations due to electrical coupling, affecting image quality, particularly in light emitting diode displays.
Innovation Solution
A display device with a touch panel that includes a subset of touch electrodes receiving a touch driving signal and a complementary subset receiving a touch driving compensation signal in reverse phase, mitigating voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch panel is integrated with the display panel, then user interaction capability is improved, but voltage fluctuations and noise in the display panel increase due to electrical coupling
Solution Approach 1:
The touch electrode array is divided into multiple groups that are driven independently with different signal phases. This segmentation allows the touch panel to maintain its interaction capability while reducing the electrical coupling noise affecting the display panel, as each group's switching activity is distributed and phased differently.
Solution Approach 2:
The touch driving signals are applied in a periodic alternating fashion with different phases to different electrode groups. This periodic action with phase differentiation enables the system to maintain touch functionality while the alternating patterns cancel out or reduce the net electrical coupling noise transmitted to the display panel.
2Measurement precision
If touch driving signals are applied to all touch electrodes simultaneously, then touch sensitivity is improved, but noise in the display panel increases due to synchronized switching
Solution Approach 1:
The touch electrode array is divided into multiple groups that are driven independently with different signal phases. This segmentation allows the touch panel to maintain its interaction capability while reducing the electrical coupling noise affecting the display panel, as each group's switching activity is distributed and phased differently.
Solution Approach 2:
Different phases are applied to different groups of touch electrodes, creating an asymmetric driving pattern. This asymmetric phasing ensures that the switching activities of different electrode groups do not occur simultaneously, thereby reducing the synchronized noise coupling to the display panel while maintaining overall touch sensitivity.
3Device complexity
If the touch panel and display panel share common electrical connections, then device complexity is reduced, but image quality deteriorates due to voltage fluctuations
Solution Approach 1:
The shared electrical connections are effectively segmented through phased driving of different electrode groups. By distributing the switching activity across multiple phases, the instantaneous current demands and voltage fluctuations on common connections are reduced, allowing simpler electrical architecture to maintain image quality.
Solution Approach 2:
The electrical coupling that initially causes noise is converted into a beneficial effect through phased driving. The alternating phase signals create canceling effects in the electrical coupling, transforming the harmful noise transmission into a mechanism that reduces net noise while maintaining the simplicity of shared electrical connections.
Data Source
AI summary
A display device including: a touch panel including a plurality of touch electrodes; and a touch integrated circuit supplying a touch driving signal or a touch driving compensation signal to the plurality of touch electrodes through a plurality of channels. Among the plurality of touch electrodes, a subset of the plurality of touch electrodes receives a touch driving signal and a complement of the subset of touch electrodes receives a touch driving compensation signal, and the touch driving compensation signal and the touch driving signal are in reverse phase with each other.