Pressing Force Sensor Auxiliary Spacer Gap Stability
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Solution Overview
Problem
Existing pressing force sensors face challenges in accurately detecting pressing forces due to shifts and wrinkles in substrates, leading to peeling off of spacers and incorrect force measurement.
Innovation Solution
The implementation of an auxiliary spacer made of a different material, such as optical clear adhesive or UV curable resin, is introduced between the substrates to maintain the gap and reduce the force on frame spacers, preventing shifts and wrinkles, and ensuring accurate pressing force detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If spacers are used to maintain gap between substrates, then measurement precision is improved, but spacers peel off under high curvature leading to measurement errors
Solution Approach 1:
The spacer system is segmented into two distinct types: frame spacers positioned at peripheral regions and auxiliary spacers positioned in internal regions. This segmentation allows each type to be optimized for its specific location and function, with frame spacers providing structural support at boundaries and auxiliary spacers maintaining gap stability in the center, preventing peeling under curvature stress
Solution Approach 2:
Different regions of the sensor are assigned different spacer configurations tailored to local requirements. Frame spacers with larger dimensions are placed at peripheral regions where structural support is needed, while auxiliary spacers are positioned in internal regions where gap maintenance is critical. This local differentiation ensures optimal performance in each region without compromising overall reliability
2Adaptability or versatility
If substrate curvature increases, then sensor adaptability is improved, but substrate shifts and wrinkles occur causing measurement errors
Solution Approach 1:
The frame spacers are installed at peripheral regions before the substrate undergoes curvature changes, establishing a stable reference framework in advance. This preliminary positioning prevents substrate shifts and wrinkles from occurring during curvature transitions, maintaining measurement precision while enabling adaptability to different curvature states
3Reliability
If force on frame spacers is reduced, then spacer reliability is improved, but gap maintenance capability may be compromised
Solution Approach 1:
The gap maintenance function is segmented between frame spacers and auxiliary spacers. Frame spacers primarily provide structural support and prevent substrate shifts, while auxiliary spacers positioned in internal regions specifically maintain the gap distance. This segmentation allows frame spacers to have reduced force requirements while gap maintenance capability is preserved by auxiliary spacers
Solution Approach 2:
Auxiliary spacers act as intermediary elements between the substrates in internal regions, specifically tasked with maintaining gap distance. This intermediary function relieves the frame spacers from bearing the full responsibility of gap maintenance, allowing them to operate with reduced force while overall gap stability is maintained by the combined spacer system
Data Source
AI summary
A pressing force sensor includes a sensor area, individual electrodes arranged in a matrix in a first direction and a second direction crossing the first direction in the sensor area, a common electrode opposed to the individual electrodes, first spacers arranged between the individual electrodes and the common electrode and overlapping the individual electrodes, and second spacers disposed in the sensor area and formed of a different material from the first spacers. With that arrangement, the dynamic range of the pressing force sensor is increased.