Electrostatic Input Device Frame Region Reduction
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Solution Overview
Problem
Conventional touch panels face challenges in reducing the size of the frame region due to the placement of second touch sensors, which limits the miniaturization of electrostatic input devices.
Innovation Solution
The electrostatic input device incorporates a second detection electrode with a longer detection range between first detection electrodes, allowing for a more compact design by dividing the second detection electrode into multiple segments and using noise-cancelling interconnects and widened portions to enhance detection precision and reduce noise impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If second touch sensors are placed in the frame region, then detection coverage is improved, but device size cannot be reduced
Solution Approach 1:
The second detection electrode is divided into multiple segments (second detection electrodes 151-155) that are strategically positioned between the first detection electrodes. This segmentation allows the detection function to be distributed across the display region rather than concentrated in the frame region, enabling size reduction while maintaining detection coverage.
Solution Approach 2:
The patent transitions from a conventional layout where secondary detection elements are placed in the frame region to a novel arrangement where detection electrodes are integrated within the display region. This dimensional reorganization allows the electrostatic input device to achieve compact form factor without sacrificing detection capabilities.
2Reliability
If detection range is extended, then detection capability is improved, but noise interference increases
Solution Approach 1:
The patent converts the harmful noise effect into a beneficial detection mechanism by using noise-cancelling interconnects. These interconnects are designed to generate opposite-phase signals that cancel out noise, transforming what would be interference into a tool for enhancing signal clarity and extending effective detection range.
Solution Approach 2:
Noise-cancelling interconnects serve as intermediary elements between the detection electrodes and the detection circuit. These interconnects mediate the signal transmission by actively canceling noise, allowing the system to maintain high detection capability over extended ranges without suffering from noise degradation.
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 configuration enables a smaller form factor for the electrostatic input device while maintaining precise detection capabilities, reducing power consumption, and minimizing noise interference, thus enhancing user interaction with touch-sensitive interfaces.
Implementation Method 1
a detection circuit that is configured to detect change in capacitance of the plurality of first detection electrodes and the second detection electrode
Implementation Method 2
first detection electrodes that are configured to detect approach of an object to be detected within a first distance from a detection face
Data Source
AI summary
An electrostatic input device includes: a plurality of first detection electrodes that are configured to detect approach of an object within a first distance from a detection face; a second detection electrode that is provided between the plurality of first detection electrodes and configured to detect approach of the object within a second distance from the detection face, where the second distance is longer than the first distance; and a detection circuit that is configured to detect change in capacitance of the plurality of first detection electrodes and the second detection electrode.