Dynamic Tactile Keypad Using Piezoelectric Materials
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Solution Overview
Problem
Existing interactive displays for electronic devices lack tactile feedback, making it difficult for users to locate keys, especially in keyboard-enabled modes, which can lead to errors and discomfort during data input.
Innovation Solution
An electronic device with a housing featuring a first surface for an image display and a second surface with a physical keypad that provides tactile feedback only in keyboard-enabled mode, using piezoelectric or magnetostrictive materials, and sensors to detect user interaction, allowing the image display to show an imaged representation of key presses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a physical keypad is always present on the second surface, then tactile feedback for key location is continuously available, but the device complexity increases and the surface cannot remain smooth in non-interactive modes
Solution Approach 1:
The physical keypad structure is made dynamic by using piezoelectric or magnetostrictive materials that can change their physical state (from smooth to raised keys) based on electrical or magnetic field activation. This allows the keypad to transition between a smooth surface state and a tactile feedback state, resolving the contradiction between always having tactile feedback and maintaining device simplicity.
Solution Approach 2:
The physical properties of the keypad material are changed on demand by applying electrical voltage or magnetic fields. The piezoelectric or magnetostrictive materials alter their shape, volume, or surface topology in response to these field changes, enabling tactile feedback only when needed rather than being permanently structured with raised keys.
2Ease of operation
If piezoelectric or magnetostrictive materials are used in the physical keypad, then tactile feedback is provided, but energy consumption increases
Solution Approach 1:
The piezoelectric or magnetostrictive materials are activated periodically or on-demand rather than continuously. Electrical voltage or magnetic fields are applied only when tactile feedback is needed (during keyboard-enabled mode), allowing the materials to return to their resting state when not in use, thereby reducing overall energy consumption while maintaining tactile feedback functionality when required.
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
Enhances user experience by providing tactile feedback for key location, reducing errors and improving comfort during data input, while maintaining a smooth surface in non-interactive modes.
Implementation Method 1
the physical keypad comprises piezoelectric material
Implementation Method 2
the physical keypad comprises magnetostrictive material
Data Source
AI summary
An electronic device including a housing having a first surface and a second surface, and an interactive display having a keyboard-enabled mode and a keyboard-disabled mode. The interactive display includes a first image display device disposed at the first surface that displays image data, and a physical keypad disposed at the second surface that provides tactile feedback to a user only when the interactive display is in the keyboard-enabled mode, the physical keypad being substantially smooth when the interactive display is in the keyboard-disabled mode.