Capacitive Touch Module With Film To Prevent Geometric Distortion
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Solution Overview
Problem
Capacitive touch screens face recognition errors and geometric relation distortions when multiple touch points are used, especially when touch units do not directly contact the screen and a film is present, leading to increased probability of non-recognition and distortion.
Innovation Solution
A multiple touch module with touch units disposed in a predesigned geometric relation on a capacitive touch screen, using a touch film to block visual exposure and apply pressure, ensuring all touch units are recognized without error, even when the number of touch points increases, by sequentially touching the screen with a minute time difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple touch units are disposed to form a geometric relation for identification and certification, then the security and reliability of touch-based services is improved, but the geometric relation may be visually exposed outside leading to easy illegal use including duplication or theft
Solution Approach 1:
A touch film is introduced as an intermediary layer between the touch units and the external environment. The touch film blocks visual exposure of the geometric relation formed by touch units while allowing capacitive touch signals to pass through to the touch screen, thus maintaining security without affecting functionality
Solution Approach 2:
A flexible touch film is used to cover and protect the touch units. The thin film structure effectively blocks visual exposure of the geometric relation while maintaining the capacitive properties needed for touch detection, preventing illegal duplication or theft of the geometric pattern
2Reliability
If the number of touch points is increased to three or more to form a geometric relation for identification, then the identification capability is improved, but the capacitance is dispersed causing recognition errors and non-recognition of touch points
Solution Approach 1:
The touch film acts as a mediator that distributes and transmits capacitive signals uniformly from multiple touch units to the touch screen. This intermediary layer prevents capacitance dispersion that would otherwise occur when multiple touch points contact the screen directly, ensuring all touch points are recognized accurately
Solution Approach 2:
The touch film serves multiple functions simultaneously: it blocks visual exposure of the geometric relation, distributes capacitive signals uniformly across multiple touch points, and enables reliable recognition of three or more touch units for identification purposes
3Reliability
If touch units are disposed behind a film to block visual exposure, then the security against illegal use is improved, but the capacitance is further dispersed increasing the probability of non-recognition of touch points
Solution Approach 1:
A specially designed flexible touch film with appropriate material properties is used. This thin film blocks visual exposure while maintaining sufficient capacitive coupling between touch units and the touch screen, preventing excessive capacitance dispersion and ensuring reliable touch point recognition
Solution Approach 2:
The electrical properties of the touch film are optimized by selecting materials and thickness parameters that balance optical blocking capability with capacitive signal transmission. The film parameters are tuned to prevent excessive capacitance dispersion while maintaining security protection
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 effectively prevents recognition errors and geometric relation distortions, ensuring all touch units are recognized and the geometric relation is maintained, enhancing the credibility of touch-based services as a secure identification and certification means.
Implementation Method 1
a plurality of touch units 105 each including a material which induces capacitance change of a capacitive touch screen
Data Source
AI summary
The present invention relates to a multiple touch module, and the multiple touch module according to the present invention includes, in a touch module touching a capacitive touch screen, a plurality of touch units each including a material which induces a capacitance change of the capacitive touch screen, and disposed in a geometric relation on a design projected on the capacitive touch screen in a predesigned unique geometric relation, and a touch film including a contact area which comes into contact with the capacitive touch screen, and configured to dispose and fix a certain number of touch units corresponding to the geometric relation on the design on an internal area provided on an opposite side of the contact area, or to come into contact with the certain number of touch units corresponding to the geometric relation on the design through the internal area when the multiple touch module touches the capacitive touch screen.