Touch Control Structure with Spaced Intersection Fill Patterns
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Solution Overview
Problem
Current touch control structures face challenges in optimizing touch performance due to high mutual capacitance, leading to longer signal loading times, particularly in multi-layer-on-cell (MLOC) touch panels, where the integration of touch electrodes and fill patterns does not effectively manage capacitance at intersections.
Innovation Solution
A touch control structure is designed with interlaced matrices of first and second touch electrodes, featuring bridge intersections and non-bridge intersections, where the latter includes intersection fill patterns that are spaced apart from the electrodes, reducing mutual capacitance by controlling the surface area ratio and optimizing electrode protrusions to minimize signal loading time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch electrodes are integrated in multi-layer-on-cell (MLOC) touch panels to achieve high touch control accuracy, then touch control accuracy is improved, but mutual capacitance increases leading to longer signal loading times
Solution Approach 1:
The touch electrode layer is segmented into multiple discrete electrode blocks arranged in interlaced matrices, with gaps between blocks. This segmentation reduces the continuous surface area of conductive material, thereby reducing mutual capacitance and signal loading time while preserving touch detection accuracy through the distributed electrode block arrangement.
Solution Approach 2:
Different regions of the touch panel have different electrode configurations: bridge intersections contain connecting bridges for electrical continuity, while non-bridge intersections contain fill patterns for capacitance management. This local differentiation optimizes both signal loading time and touch control accuracy in specific regions.
2Reliability
If electrode surface area is increased to improve touch detection sensitivity, then touch detection sensitivity is improved, but mutual capacitance increases leading to longer signal loading times
Solution Approach 1:
The surface area ratio of conductive material is controlled within a specific range (0.5%-5%) to optimize the balance between touch detection sensitivity and signal loading time. The electrode block dimensions, spacing, and fill pattern densities are adjusted as parameters to achieve optimal performance.
Solution Approach 2:
The electrode structure incorporates a porous or mesh-like configuration with gaps and spaces between electrode blocks and within the fill patterns. This porous structure reduces the effective conductive surface area and mutual capacitance while maintaining sufficient charge accumulation for sensitive touch detection.
3Loss of time
If fill patterns are added at all intersections to reduce mutual capacitance, then signal loading time is reduced, but manufacturing complexity increases
Solution Approach 1:
The fill patterns are selectively applied only at non-bridge intersections, segmenting the capacitance management approach by location. This reduces manufacturing complexity compared to uniform fill patterns at all intersections, while still achieving signal loading time reduction through targeted capacitance control.
Solution Approach 2:
Different intersection types (bridge vs. non-bridge) receive different treatments: bridge intersections maintain electrode connectivity with bridges, while non-bridge intersections receive fill patterns for capacitance reduction. This local differentiation simplifies manufacturing by providing clear, location-specific fabrication guidelines.
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
The proposed structure enhances touch performance by reducing mutual capacitance and signal loading time, improving accuracy and efficiency in multi-point touch control, while maintaining resistance levels, thus addressing the limitations of existing MLOC touch panels.
Implementation Method 1
reducing mutual capacitance by controlling the surface area ratio and optimizing electrode protrusions to minimize signal loading time
Data Source
AI summary
A touch control structure is provided. The touch control structure includes a plurality of first touch electrodes arranged in a plurality of rows and a plurality of second touch electrodes arranged in a plurality of columns, forming a plurality of bridge intersections and a plurality of non-bridge intersections. The touch control structure at a respective one of the plurality of bridge intersections includes a respective one of a plurality of first bridges connecting two adjacent first touch electrode blocks in a respective row and a respective one of a plurality of second bridges connecting two adjacent second touch electrode blocks in a respective column. The touch control structure at a respective one of the plurality of non-bridge intersections includes a respective one of a plurality of intersection fill patterns spaced apart from the first touch electrode blocks and the second touch electrode blocks.