Touch Panel Adhesive Segmentation for Ultrasound Noise Reduction
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Solution Overview
Problem
Conventional operation input devices using touch panels often emit strange sounds due to interference between the vibrating panel and the fingerprint of the user's finger tip, which affects the tactile sensation experience.
Innovation Solution
The device incorporates a substrate that vibrates at an ultrasound frequency, with a protection film and an adhesive agent strategically placed to reduce the generation of strange sounds by creating air passages and varying the intensity of squeeze films formed between the substrate and the protection film, thereby enhancing tactile sensation while minimizing unwanted noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the touch panel vibrates at ultrasound frequency to provide tactile sensation, then the tactile sensation is improved, but strange sounds are generated due to interference with fingerprint
Solution Approach 1:
The adhesive agent is divided into multiple discrete spots rather than being applied continuously. This segmentation creates multiple small air passages between the protection film and substrate, which disrupts the formation of large-scale interference patterns that cause strange sounds, while still maintaining sufficient bonding and tactile sensation.
Solution Approach 2:
Air passages are introduced as an intermediary layer between the substrate and protection film. These air passages modify the vibration transmission characteristics, reducing the interference between substrate vibration and fingerprint that causes strange sounds, while allowing the tactile sensation function to be maintained.
2Strength
If adhesive agent is applied to bond protection film to substrate, then bonding strength is improved, but air passages are blocked and strange sounds increase
Solution Approach 1:
The adhesive agent is applied in discrete spots rather than as a continuous layer. This segmentation strategy maintains bonding strength at the adhesive-substrate interface while creating air passages in the non-adhesive regions, thereby reducing strange sounds without sacrificing overall bonding performance.
Solution Approach 2:
Different regions of the protection film-substrate interface have different properties: adhesive spots provide strong bonding while non-adhesive regions provide air passages. This local differentiation allows the system to simultaneously achieve both strong bonding and reduced strange sounds.
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 suppresses the generation of strange sounds during vibration, providing a smoother tactile sensation to the user while maintaining the clarity and uniformity of the image displayed on the touch panel.
Implementation Method 1
The substrate vibrates at an ultrasound frequency, and receives a touch input operation
Implementation Method 2
The adhesive agent is provided to a plurality of locations between the substrate and the protection film, and the protection film is bonded to the substrate by the adhesive agent
Data Source
AI summary
An operation input device according to an embodiment includes a substrate, a protection film, and an adhesive agent. The substrate vibrates at an ultrasound frequency, and receives a touch input operation. The protection film is disposed on the substrate on the side of an operation surface. The adhesive agent is provided to a plurality of locations between the substrate and the protection film, and the protection film is bonded to the substrate by the adhesive agent.