Touch Display Panel Common Electrode Reuse for Signal Noise Reduction
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Solution Overview
Problem
In vertical alignment (VA) display mode, the common electrode on the color filter side of touch display panels causes shielding interference, reducing the signal-to-noise ratio and sensitivity of touch functions.
Innovation Solution
A touch display panel design where the first common electrode is reused as a touch electrode, integrated within the panel structure, with the display surface located on the side of the first substrate away from the second substrate, avoiding interference from the second common electrode and improving signal-to-noise ratio and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common electrode is provided on the entire surface of the color filter side in VA display mode, then the display structure is complete, but the touch signal-to-noise ratio is reduced due to shielding effect
Solution Approach 1:
The patent divides the common electrode into two separate common electrodes: one on the first substrate and one on the second substrate. This segmentation allows the touch detection to be performed on the first substrate side where the display surface is located, avoiding the shielding effect from the common electrode on the color filter side (second substrate). The segmentation resolves the contradiction by separating the display function from the touch detection function in terms of electrode placement.
Solution Approach 2:
The patent changes the dimensional arrangement by moving the touch detection function to the first substrate side (display surface side) rather than keeping it on the second substrate side (color filter side). This dimensional change allows touch signals to be detected before passing through the liquid crystal layer and common electrode, thereby avoiding the shielding effect and improving the signal-to-noise ratio.
2Reliability
If the display surface is located on the second substrate side, then the conventional structure is maintained, but the second common electrode causes interference with touch signals
Solution Approach 1:
The patent inverts the conventional arrangement by making the first substrate (array substrate) the display surface side instead of the second substrate (color filter substrate). This inversion allows the touch detection to occur on the first substrate side where there is no common electrode causing shielding, thereby eliminating the interference problem while maintaining complete display functionality.
3Adaptability or versatility
If separate touch electrodes and common electrodes are used, then the touch function is complete, but the device complexity and thickness increase
Solution Approach 1:
The patent makes the first common electrode serve dual functions: as part of the display driving structure and as the touch detection electrode. By reusing the first common electrode for touch detection instead of adding a separate touch electrode layer, the patent reduces device complexity and thickness while maintaining complete touch functionality. This multi-functionality approach resolves the contradiction between functional completeness and structural simplicity.
Data Source
AI summary
The present disclosure discloses a touch display panel and a display device. The touch display panel includes a first substrate and a second substrate arranged opposite to each other. The first substrate includes a first base and a first common electrode arranged on the first base. The first common electrode is reused as a touch electrode. The second substrate includes a second base and a second common electrode. The second common electrode is arranged over an entire surface of one side of the second base close to the first base. One surface of the first substrate away from the second substrate is a display surface.