Touch Sensor Bridge Lines for Uniform Sensitivity
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Solution Overview
Problem
Existing touch sensors in display devices often fail to achieve uniform touch sensitivity due to differences in load values and electrostatic capacitance across various sensing regions, leading to inconsistent user input experiences.
Innovation Solution
A touch sensor design with a base layer featuring multiple sensing regions of different areas, connected by bridge lines and additional non-sensing regions, which compensate for load value differences by electrically connecting touch electrodes and adjusting resistance values, ensuring uniform sensitivity across the sensor surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sensing regions have different areas to accommodate display panel variations, then the touch sensor can be adapted to different display sizes, but the touch sensitivity becomes non-uniform across regions
Solution Approach 1:
The patent applies local quality by making different parts of the touch sensor have different properties. Specifically, the touch electrode patterns, spacing, and/or materials are varied in different sensing regions to compensate for area differences, ensuring each region achieves uniform touch sensitivity despite having different sizes. This allows the touch sensor to adapt to different display panel sizes while maintaining consistent touch detection quality across all regions.
2Measurement precision
If touch electrode spacing is reduced to increase sensing resolution, then detection precision improves, but the load value differences between regions increase causing non-uniform sensitivity
Solution Approach 1:
The patent implements local quality by adjusting touch electrode characteristics in different sensing regions. In regions with smaller areas, the touch electrode patterns are modified (such as changing spacing, size, or arrangement) to compensate for the reduced area effect. This ensures that even with reduced electrode spacing for higher resolution, the load values and sensitivity remain uniform across all sensing regions, resolving the contradiction between resolution and sensitivity uniformity.
3Area of stationary object
If the touch sensor covers the entire display panel surface, then the sensing area increases, but the structural complexity increases due to need for uniform sensitivity across regions
Solution Approach 1:
The patent applies segmentation by dividing the touch sensor into multiple sensing regions with different characteristics. Each region is designed with specific touch electrode patterns and configurations tailored to its area and function. This segmentation allows the overall sensing area to cover the entire display panel while managing structural complexity through modular regional designs that can be independently optimized for uniform sensitivity.
Solution Approach 2:
The patent uses local quality by赋予ing different properties to different sensing regions. Each region has customized touch electrode patterns, spacing, and/or materials optimized for its specific area and display panel section. This approach enables full surface coverage while avoiding the need for a single complex uniform design, as each region can be independently designed to achieve optimal sensitivity with simpler local structures.
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 solution enables uniform touch sensitivity across the entire touch sensor surface, enhancing user input accuracy and consistency by equalizing load values and electrostatic capacitance in each sensing region.
Implementation Method 1
differences in load values and electrostatic capacitance across various sensing regions
Implementation Method 2
adjusting resistance values, ensuring uniform sensitivity across the sensor surface
Data Source
AI summary
A touch sensor includes a base layer including a first to third sensing region and a non-sensing region surrounding the first to third sensing region; a plurality of touch electrode rows provided in the first to third sensing regions and including a plurality of first touch electrodes connected in a first direction; and a plurality of touch electrode columns including a plurality of second touch electrodes connected in a second direction crossing the first direction. At least one of the first to third sensing regions has an area larger than that of other sensing regions. The non-sensing region includes an additional non-sensing region disposed between the second sensing region and the third sensing region and a bridge line provided in the additional non-sensing region and electrically connecting the first touch electrodes of the second sensing region to the first touch electrodes of the third sensing region.