Flexible Display Keyswitch Layer for False-Touch Prevention
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Solution Overview
Problem
Capacitive touch modules in flexible display devices suffer from false touch issues and inadequate tactile feedback, particularly in virtual keyboard applications.
Innovation Solution
A flexible display input device is designed with a keyswitch layer comprising elastic films and electrodes, along with a trigger layer and supporting structures, which enhances tactile feedback and accuracy by limiting the area of deformation and preventing accidental key activations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a capacitive touch module is used in a flexible display device, then the device can achieve a thin and flexible structure, but false touch issues occur and tactile feedback is inadequate
Solution Approach 1:
The touch-sensitive surface is divided into multiple independent keyswitch regions, each with its own electrode pair. This segmentation allows each key to be detected independently, preventing false touches between adjacent keys while providing distinct tactile feedback for each key press.
Solution Approach 2:
The patent replaces traditional mechanical switches with a capacitive sensing system that uses electrical field detection instead of mechanical contact. This substitution maintains the thin and flexible structure while providing tactile feedback through capacitive coupling between electrodes and the user's finger.
2Measurement precision
If a capacitive touch module is used, then the device structure remains simple and flexible, but the accuracy of key input is reduced due to lack of physical boundaries
Solution Approach 1:
The sensing surface is segmented into discrete key regions with clearly defined electrode boundaries. Each key corresponds to a specific electrode pair, providing precise key identification without requiring complex mechanical structures or additional layers.
Solution Approach 2:
Different regions of the flexible display have different electrical properties - key areas have electrode pairs with specific capacitance values, while non-key areas have different capacitance characteristics. This local differentiation enables accurate key detection without increasing overall structural complexity.
3Ease of operation
If the flexible display layer is pressed for key activation, then key input can be registered, but adjacent keys may be accidentally triggered due to displacement
Solution Approach 1:
Each key is associated with a dedicated electrode pair positioned at specific locations. The electrical detection is localized to each electrode pair, so pressing one key only affects its corresponding electrodes, not adjacent ones. This spatial segmentation prevents accidental triggering of neighboring keys.
Solution Approach 2:
The flexible substrate acts as an intermediary that transmits the pressing force locally to the specific electrode pair beneath the pressed key. The force distribution is confined to the key region, preventing propagation to adjacent keys and ensuring accurate key registration.
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 reduces accidental touches and improves tactile feedback by allowing precise keyswitch activation with reduced displacement of the flexible display layer, while minimizing the risk of triggering adjacent keys.
Implementation Method 1
The keyswitch layer is disposed under the flexible display layer and includes a first elastic film, a first electrode, a second elastic film, and a second electrode
Data Source
AI summary
A flexible display input device includes a flexible display layer and a keyswitch layer. The keyswitch layer is disposed under the flexible display layer and includes a first elastic film, a first electrode, a second elastic film, and a second electrode. The first electrode is disposed on a side of the first elastic film facing toward the flexible display layer. The second elastic film is located between the flexible display layer and the first elastic film. The second electrode is disposed on a side of the second elastic film facing toward the first elastic film and is opposite to the first electrode.