Touch Panel Switch Circuits for Accurate Pressure Sensing
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Solution Overview
Problem
Existing pressure sensitive structures suffer from errors in pressure value measurement due to electric charge leakage to irrelevant electrodes, leading to inaccurate detection of pressure positions and magnitudes.
Innovation Solution
A touch panel design with a first electrode layer, an elastic dielectric layer, and a second electrode layer, incorporating switch circuits that connect or disconnect second electrodes to second circuits based on signal control, preventing charge leakage and enhancing precision in pressure sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If driving signals are provided to first electrodes and second electrodes are used for sensing, then pressure positions and magnitudes can be detected, but electric charges leak to irrelevant second electrodes causing measurement errors
Solution Approach 1:
The patent divides the second electrode layer into multiple independent second electrodes (122A-122E) arranged in parallel, each capable of being independently connected or disconnected from the sensing circuit through switch circuits. This segmentation allows the system to isolate and prevent charge leakage to irrelevant electrodes while maintaining detection capability at specific pressure points.
Solution Approach 2:
The patent introduces switch circuits that dynamically connect or disconnect second electrodes from the sensing circuit based on detection needs. This dynamic configuration allows the system to adaptively prevent charge leakage to irrelevant electrodes during the sensing process, resolving the contradiction between detection capability and charge leakage prevention.
2Adaptability or versatility
If multiple second electrodes are used to detect pressure points, then pressure position detection capability is improved, but charge leakage to irrelevant electrodes causes fake detections and errors
Solution Approach 1:
The patent segments the second electrode layer into multiple independent electrodes (122A-122E), each corresponding to specific pressure detection zones. This segmentation enables versatile pressure point detection while allowing individual electrodes to be isolated using switch circuits, preventing charge leakage from affecting detection accuracy.
Solution Approach 2:
The patent introduces switch circuits as intermediary components between the second electrodes and the sensing circuit. These switch circuits act as mediators that selectively connect or disconnect electrodes based on detection requirements, preventing charge leakage to irrelevant electrodes while maintaining detection versatility.
3Area of stationary object
If second electrodes are continuously connected to sensing circuits, then detection coverage is maximized, but charge leakage occurs to irrelevant electrodes sharing the same circuit
Solution Approach 1:
The patent segments the sensing circuit into multiple independent paths, each associated with a specific second electrode. This segmentation allows the system to maintain wide detection coverage by having multiple electrodes connected while preventing charge leakage through selective disconnection of irrelevant electrodes during specific measurements.
Solution Approach 2:
The patent implements dynamic connection control through switch circuits that adaptively connect or disconnect second electrodes from sensing circuits based on detection needs. This dynamic approach maintains maximum detection coverage while preventing charge leakage to irrelevant electrodes during specific measurement operations.
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 prevents electric charge leakage to irrelevant electrodes, enabling precise measurement of pressure positions and values by ensuring accurate detection and calculation of pressure points.
Implementation Method 1
An intersection of one of the first electrodes 111 and one of the second electrodes 122 forms a capacitor. Since there are pressures, the elastic dielectric layers 1800 at these three points deform accordingly. In other words, capacitances of the capacitors in the intersections around these three points would be changed as a result.
Implementation Method 2
the elastic dielectric layers 1800 at these three points deform accordingly
Data Source
AI summary
A touch panel sequentially comprising: a first electrode layer, an elastic dielectric layer, and a second structure, the first electrode layer comprises one or more first electrodes in parallel to a first axis, the second structure comprises multiple second circuits in parallel to a second axis, multiple third circuits in parallel to the first axis, multiple second electrodes, and multiple switch circuits, wherein each of the switch circuits connects one of the second electrodes and one of the second circuits, respectively, wherein each of the switch circuits is configured to connect or disconnect the one of the second electrodes and the one of the second circuits according to signals transmitted from one of the third circuits, wherein each of the first electrodes covers at least one of the third circuits, the switch circuits configured by the at least covered one of the third circuits, and the second electrodes corresponding to the switch circuits.