Capacitive Touchscreen Split Electrode Overlap Reduction
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Solution Overview
Problem
Capacitive touchscreens with solid driving electrodes and split sensing electrodes often have reduced touch sensitivity due to significant overlap, leading to lower sensitivity and visibility issues.
Innovation Solution
A capacitive touchscreen design featuring split electrodes and dummy electrodes with slits on both surfaces of a transparent insulating substrate, reducing overlap area and enhancing touch sensitivity while minimizing pattern visibility through uniform slit distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If solid driving electrodes and split sensing electrodes are used with large overlap area, then the touchscreen structure is simplified and manufacturing is easier, but touch sensitivity decreases
Solution Approach 1:
The patent divides both the driving electrodes and sensing electrodes into multiple split electrodes arranged in interleaved patterns. This segmentation reduces the overlap area between driving and sensing electrodes while maintaining electrical functionality, thereby improving touch sensitivity without significantly complicating the manufacturing process
Solution Approach 2:
The patent introduces a dimensional arrangement where split electrodes are positioned in alternating sequences on the same surface, creating a non-overlapping interleaved pattern. This spatial reconfiguration reduces capacitance coupling between driving and sensing electrodes, enhancing touch sensitivity while keeping the electrode structure on a single substrate plane
2Stability of the object's composition
If dummy electrodes are added to reduce pattern visibility, then the uniformity of pattern distribution is improved, but parasitic capacitance increases
Solution Approach 1:
The dummy electrodes are divided into multiple fine segments or splits, which reduces the continuous conductive area and thereby minimizes parasitic capacitance while still achieving the optical effect of reducing pattern visibility through uniform distribution
Solution Approach 2:
The patent applies dummy electrodes selectively in specific regions where pattern visibility needs to be reduced, rather than uniformly across the entire touchscreen. This localized application maintains pattern uniformity in critical areas while minimizing overall parasitic capacitance
3Area of stationary object
If larger overlap area between driving and sensing electrodes is used, then the touchscreen coverage is improved, but touch detection speed decreases
Solution Approach 1:
By segmenting electrodes into multiple smaller units arranged in interleaved patterns, the patent achieves full touchscreen coverage while reducing the overlap area of individual electrode pairs. This segmentation allows for faster charge discharge cycles, improving touch detection speed without sacrificing coverage
Solution Approach 2:
The patent employs dynamic voltage switching between adjacent split electrodes in sequence, enabling rapid scanning across the touchscreen surface. This dynamic activation pattern allows comprehensive coverage to be achieved through time-multiplexed scanning rather than simultaneous activation, thereby improving touch detection speed
Data Source
AI summary
A capacitive touchscreen has higher touch sensitivity. In a capacitive touchscreen, a first electrode pattern is located on a first surface of a first substrate and includes a plurality of first split electrodes. A first dummy electrode pattern is located on the first surface of the first substrate and includes a plurality of first dummy electrodes. A second electrode pattern is located on a second surface of the first substrate and includes a plurality of second split electrodes. A second dummy electrode pattern is located on the second surface of a second substrate and includes a plurality of second dummy electrodes.