Transparent Touch Interface With Angled Piezoelectric Layers
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Solution Overview
Problem
Existing vibrating touch interfaces for display screens have a contact surface that occupies more space than the display area, limiting the usable surface for viewing objects, and cannot utilize the entire contact surface for display purposes.
Innovation Solution
A touch interface with a transparent contact surface and rigid piezoelectric layers arranged non-parallel to the surface, specifically at angles between 45° and 90°, or perpendicular to the surface, which generates stationary waves like Lamb waves, allowing for a larger display area without increasing the total contact surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If piezoelectric transducers are deposited on the contact surface to generate vibrations, then the touch interface can generate stationary waves for tactile feedback, but the contact surface area available for display is reduced
Solution Approach 1:
The piezoelectric layer is arranged in a plane non-parallel to the contact surface, specifically at an angle between 45° and 90°, transforming the traditional planar deposition into a three-dimensional configuration. This angular arrangement allows the piezoelectric material to generate vibrations effectively while occupying minimal surface area on the contact surface, thereby preserving maximum display area.
Solution Approach 2:
The piezoelectric layer is segmented into discrete elements arranged in specific patterns on the contact surface. This segmentation allows the vibrations to be generated at specific locations while leaving other areas of the contact surface free for display purposes, optimizing the balance between tactile feedback capability and display area.
2Area of stationary object
If the contact surface is made entirely transparent for viewing, then the display area is maximized, but the ability to generate vibrations for tactile feedback is compromised
Solution Approach 1:
By arranging the piezoelectric layer at an angle between 45° and 90° relative to the contact surface, the system maintains transparency of the contact surface for display purposes while the angled piezoelectric material provides the necessary vibration generation capability. The three-dimensional arrangement ensures that the piezoelectric layer does not obstruct the transparent viewing surface.
Solution Approach 2:
The piezoelectric layer is positioned specifically at the periphery of the transparent portion, concentrating the vibration generation function at the edges while maintaining the center and majority of the surface as transparent display area. This local placement allows different regions of the contact surface to serve different functions optimally.
3Ease of manufacture
If piezoelectric layers are arranged parallel to the contact surface, then the structure is simple and manufacturing is easier, but the contact surface area available for display is reduced
Solution Approach 1:
The piezoelectric layer is arranged at an angle between 45° and 90° to the contact surface, moving from a simple planar configuration to a three-dimensional angular arrangement. This angular configuration reduces the surface area occupied by the piezoelectric material, thereby increasing the display area while still maintaining manufacturing feasibility through standardized angular placement procedures.
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 larger portion of the contact surface to be used for display while minimizing the space occupied by the piezoelectric layers, allowing all of the contact surface to be utilized for viewing, thus enhancing the efficiency of the touch interface in display screens.
Implementation Method 1
said vibration means comprise at least one rigid piezoelectric layer, firmly fixed to said contact surface
Implementation Method 2
The at least one piezoelectric layer is arranged so as to generate, in said contact surface, stationary surface acoustic waves called Lamb or Rayleigh waves, and more particularly Lamb waves of the order of a few tens of kHz
Data Source
AI summary
The The invention relates to a touch interface comprising a contact surface and means for vibrating the contact surface, said means being provided to generate standing waves in said surface. The contact surface includes at least one transparent portion forming a surface for seeing through the touch interface, and the vibration generating means include at least one rigid piezoelectric layer that is rigidly connected to the contact surface and disposed on the periphery of the transparent portion. The interface is characterized in that the at least one piezoelectric layer is disposed in a plane that is not parallel to the contact surface. The invention also relates to a display screen using such an interface, and to an electric appliance using such a display screen.