Touch Sensor Capacitance Balancing via Variable Resistance Bridges
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Solution Overview
Problem
The arrangement of touch electrode strings in display devices leads to unbalanced mutual capacitance due to differences in peripheral wiring, affecting touch performance.
Innovation Solution
A touch sensor design with parallel first and second touch electrode strings, where conductive bridges with varying resistances connect adjacent electrodes to adjust mutual capacitance, ensuring it is uniform or within a predetermined range, and conductive mediums are used to further balance capacitance, proportional to wiring length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch electrode strings are arranged with peripheral wirings, then the display device can function as a touch sensor, but the mutual capacitance between touch electrode strings becomes unbalanced
Solution Approach 1:
The patent applies local quality by introducing compensation capacitors at specific locations where capacitance imbalance occurs. Different electrode strings receive different compensation values based on their individual imbalance characteristics, rather than applying a uniform solution across all electrodes. This localized approach restores mutual capacitance uniformity while preserving the functional wiring arrangement.
Solution Approach 2:
The patent changes the capacitance parameter by adding compensation capacitors with specific capacitance values to counterbalance the wiring-induced capacitance differences. By adjusting the compensation capacitor values, the total mutual capacitance for each electrode pair is equalized, transforming the unbalanced system into a balanced one while maintaining the original functional structure.
2Ease of operation
If peripheral wirings are used to connect touch electrode strings, then the touch sensor can be operated, but the wiring arrangement causes unbalance on mutual capacitance
Solution Approach 1:
The compensation capacitors serve as intermediary elements that mediate between the peripheral wirings and the touch electrode strings. These intermediaries compensate for the harmful capacitance effects introduced by the wirings, allowing the system to maintain both operational ease and capacitance balance simultaneously.
3Ease of manufacture
If the arrangement of periphery wirings for connecting touch electrode strings is simplified, then the device structure is easier to manufacture, but the mutual capacitance balance is affected
Solution Approach 1:
Rather than complicating the overall wiring arrangement, the patent applies local quality by adding compensation capacitors only at specific electrode string locations where capacitance imbalance occurs. This maintains the simplicity of the general wiring structure while locally correcting the capacitance uniformity issue.
Solution Approach 2:
The patent changes the capacitance parameter by introducing compensation capacitors that offset the wiring-induced capacitance variations. This allows the simplified wiring arrangement to be maintained while achieving the required capacitance uniformity through parameter adjustment.
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 design balances mutual capacitance between touch electrode strings, enhancing touch performance by ensuring consistent input responsiveness across the display device.
Implementation Method 1
a first conductive bridge or a second conductive bridge connecting two adjacent first touch electrodes in the first touch electrode strings respectively, wherein the resistance of the first conductive bridge is different from the resistance of the second conductive bridge to adjust the mutual capacitance between the plurality of first touch electrode strings
Data Source
AI summary
A touch sensor comprises first and second touch electrode stings. Each first touch electrode string comprises the same number of first touch electrodes in a first direction. Two adjacent first touch electrodes connect by a first or second conductive bridge. The resistance of the bridges is different to adjust the mutual capacitance such that the mutual capacitance or the difference of the mutual capacitance of the first touch electrode strings is the same or within a first predetermined range. Each second touch electrode string comprises the same number of second touch electrodes arranged in a second direction. Two adjacent second touch electrodes connect by a third or forth conductive bridge. The resistance of the bridges is different to adjust the mutual capacitance such that the mutual capacitance or the difference of the mutual capacitance of the second touch electrode strings is the same or within a second predetermined range.