Transparent Piezo Module for Position-Selective Haptic Feedback
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Solution Overview
Problem
Current display devices with haptic feedback systems using piezo actuators are limited by their non-transparent nature, which restricts view, and require additional mechanical coupling elements, leading to increased costs and reduced installation space, while combining touch sensor technology, haptic actuator technology, and anti-reflective coatings is challenging due to heterogeneous manufacturing steps and materials.
Innovation Solution
A transparent module for display devices featuring a transparent substrate with a second transparent electrode sandwiched between a transparent piezoelectric material, where the electrode islands are spaced apart to allow for position-selective haptic feedback without additional mechanical coupling, using a conductive path arrangement and electrode islands with specific layer thicknesses to achieve anti-reflective properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If piezo actuators with mechanical coupling elements are used for haptic feedback, then haptic feedback function is achieved, but transparency and view of the display are restricted
Solution Approach 1:
The patent extracts and removes the mechanical coupling elements from the system by directly integrating the piezo actuators onto the display surface. This eliminates the need for separate mechanical components that would block the display view, while maintaining the haptic feedback function through direct piezoelectric actuation.
Solution Approach 2:
The patent merges the piezo actuator structure with the display surface by coating the piezoelectric material directly onto the display. This integration combines the haptic actuation function with the display structure, eliminating the need for separate mechanical coupling elements and preserving display transparency.
2Illumination intensity
If piezo actuators are arranged in the peripheral area of the display, then transparency is maintained, but additional mechanical coupling elements are required increasing complexity and cost
Solution Approach 1:
The patent extracts and eliminates the mechanical coupling elements from the system by采用ing a direct coating approach where piezoelectric material is applied directly to the display surface, removing the need for separate mechanical components entirely.
Solution Approach 2:
The patent makes the piezoelectric coating serve multiple functions: it provides haptic feedback actuation while also serving as the structural interface between the actuator and display surface, eliminating the need for separate mechanical coupling elements.
3Reliability
If touch sensor technology, haptic actuator technology and anti-reflective coatings are implemented separately, then each function is achieved, but manufacturing complexity and material costs increase
Solution Approach 1:
The patent merges multiple functional layers (touch sensor electrodes, piezoelectric actuator material, and anti-reflective coating) into a single integrated coating structure on the display surface. This consolidation reduces the number of separate manufacturing steps and material applications while maintaining all required functions.
Solution Approach 2:
The patent creates a multi-functional coating layer that simultaneously serves as the touch sensor electrode, the piezoelectric actuator material, and the anti-reflective coating, allowing a single manufacturing process to achieve multiple functions that would otherwise require separate implementation steps.
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 enables position-selective haptic feedback on transparent display devices with reduced manufacturing and material costs, improved installation space, and enhanced quality characteristics by integrating haptic actuator technology and anti-reflective coatings within a single module.
Implementation Method 1
an electrical voltage is applied to the electrodes. This stimulates the piezo actuators to vibrate via the piezoelectric effect
Implementation Method 2
at least the first conductive path and/or one of the electrode islands has a layer thickness of 95 to 195 nm
Data Source
AI summary
The invention relates to a module (1) for a display and/or operating device (10), the module (1) comprising a first transparent electrode (3) having a first matrix of a plurality of electrode islands (3a, 3b, 3c); a transparent piezoelectric layer (2) having a first and a second area; a second transparent electrode (4); a transparent substrate (12); and a conductive path arrangement having at least a first conductive path (24a) on the transparent piezoelectric layer (2), wherein the transparent substrate (12) is coated with the second transparent electrode (4) and the second transparent electrode (4) is disposed between the transparent substrate and the transparent piezoelectric layer (2), and the first area is coated with the first transparent electrode and the second area is coated with the second transparent electrode (4); and the electrode islands (3a, 3b, 3c) are arranged electrically insulated from one another on the first area of the transparent piezoelectric material (2), wherein at least the first conductive path (24a) of the conductive path arrangement (25) is electrically connected to at least one of the electrode islands (3a, 3b, 3c), and at least the first conductive path (24a) and/or at least one of the electrode islands (3a, 3b, 3c) has a layer thickness from 95 nm to 195 nm.