Touch Display Panel Edge Electrode Area Optimization
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Solution Overview
Problem
Existing capacitive touch display panels face design limitations, particularly in achieving a slim border design without experiencing optical issues like the 'mura' phenomenon or moiré visual effects, which restricts design flexibility.
Innovation Solution
The design incorporates a touch electrode layer with non-edge and edge unit regions, where the edge unit regions overlap both the display and peripheral regions, and the electrode series areas and capacitance values are carefully optimized to ensure that the area and capacitance differences between non-edge and edge regions are within 10%, allowing for increased design flexibility while maintaining sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the touch panel and display panel are overlapped to achieve integration, then the response time is reduced and reliability is improved, but optical problems such as mura phenomenon and moiré visual effects occur
Solution Approach 1:
The patent introduces a third dimension (depth/layering) by creating distinct physical layers for touch sensing and display functions. The touch sensor layer is positioned above the display panel with a defined gap, allowing optical independence while maintaining functional integration. This vertical separation eliminates moiré effects and mura phenomena while preserving the responsive touch interface.
Solution Approach 2:
The patent divides the integrated display-touch structure into separate functional segments: a display panel layer and a touch sensor layer. This segmentation allows each layer to be optimized independently for its specific function while maintaining overall integration, thereby avoiding optical interference between the two functions.
2Volume of moving object
If a slim border design is implemented, then the compact volume and user-friendly design are improved, but design flexibility is restricted due to optical problems
Solution Approach 1:
By moving the touch sensing function to a separate vertical layer above the display, the patent enables slim border designs without the optical interference that previously constrained design flexibility. The vertical separation allows the touch panel to extend to the edges of the display without creating moiré effects, thus achieving both compact volume and design flexibility.
3Measurement precision
If the touch electrode layer extends to edge regions, then the touch sensitivity at edges and corners is improved, but the area difference and capacitance variation increase
Solution Approach 1:
The patent applies different electrode configurations to different regions of the touch panel. Edge unit regions have extended electrode patterns that reach the borders to improve edge touch sensitivity, while non-edge unit regions maintain standard configurations. This localized differentiation ensures uniform capacitance values across all regions while providing enhanced sensitivity where needed.
4Measurement precision
If the electrode series area is increased to improve touch sensitivity, then the capacitance value increases, but the area difference between edge and non-edge regions becomes larger
Solution Approach 1:
The patent implements region-specific electrode designs where edge unit regions have larger electrode areas to compensate for lower natural capacitance at borders, while non-edge regions maintain smaller, uniform areas. This localized quality adjustment ensures that capacitance values remain uniform across the entire touch panel (within 10% variation) while maintaining high sensitivity throughout, including at edges and corners.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables a slim border design with improved sensitivity and uniform electric field distribution, preventing resistive-capacitive delays and enhancing touch sensitivity, especially at edges and corners, thus increasing design flexibility without compromising performance.
Implementation Method 1
a capacitance value between the first electrode series and the second electrode series correspondingly disposed within each non-edge unit region is C1, a capacitance value between the first electrode series and the second electrode series correspondingly disposed within each edge unit region is C1′
Data Source
AI summary
A touch display panel including a display panel and a touch electrode layer is provided. The display panel has a display region and a peripheral region. The touch electrode layer includes a non-edge unit region and an edge unit region, wherein the vertical projection of the non-edge unit region is completely located within the vertical projection of the display region, the vertical projection of the edge unit region overlaps the vertical projections of the display region and the peripheral region, and the size of the edge unit region is greater than the size of the non-edge unit region. The touch electrode layer includes a first electrode series and a second electrode series extending in different directions. The area of the first electrode series disposed within the non-edge unit region is A1, the area of the first electrode series disposed within the edge unit region is A1′, and (|A1−A1′|)/A1≤10%. The area of the second electrode series disposed within the non-edge unit region is A2, the area of the second electrode series disposed within the edge unit region is A2′, and (|A2−A2′|)/A2≤10%. A capacitance value between the first and second electrode series disposed within the non-edge unit region is C1, a capacitance value between the first and second electrode series disposed within the edge unit region is C1′, and (|C1−C1′|)≤10%.