Haptic Display Device Integrating EAP Actuators
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Solution Overview
Problem
Existing haptic display devices face challenges in miniaturization and flexibility due to the limited space for haptic actuators, which complicates the integration of haptic feedback in mobile devices and flexible displays.
Innovation Solution
A haptic display device design that incorporates haptic control lines and members within the display structure, using Electro Active Polymer (EAP) materials, allowing for miniaturization and slimming by eliminating the need for a separate haptic actuator, and enabling haptic feedback through changes in the height of these members due to voltage differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate haptic actuator is used, then haptic feedback function is achieved, but device size increases and flexibility is reduced
Solution Approach 1:
The patent combines the haptic actuator function with the display structure by integrating haptic control lines and haptic members directly into the display device layers. This merging eliminates the need for a separate haptic actuator component, thereby reducing device volume while maintaining the haptic feedback function.
Solution Approach 2:
The display device structure is designed to serve multiple functions: it provides both visual display and haptic feedback through the integrated haptic control lines and haptic members. This multi-functionality allows the same structure to deliver both display and tactile feedback without requiring additional dedicated components.
2Reliability
If a separate haptic actuator is used, then haptic feedback is provided, but device complexity increases
Solution Approach 1:
By merging the haptic control lines and haptic members into the existing display device layers, the patent reduces the number of separate components and interfaces that need to be integrated. This integration simplifies the overall device structure and reduces integration complexity compared to using a separate haptic actuator.
3Measurement precision
If haptic control lines are integrated within display structure, then haptic resolution is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the haptic control into individual haptic control lines corresponding to different pixel rows or columns, allowing for precise local control of haptic feedback. This segmentation enables high haptic resolution by independently controlling haptic actuators at different locations, while the systematic arrangement facilitates manufacturing through standardized processes.
Solution Approach 2:
The haptic control lines are arranged in a systematic pattern within the display layers, utilizing the two-dimensional plane of the display structure. This dimensional arrangement allows for high-resolution haptic control across the display area while maintaining compatibility with standard flat-panel manufacturing processes.
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 design allows for improved haptic resolution and recognition, enabling miniaturization and flexibility in haptic feedback systems, suitable for use in mobile and flexible displays without the need for additional haptic actuators.
Implementation Method 1
A haptic member may be provided at a crossing region between the haptic control line and the scan line
Data Source
AI summary
A haptic display device is disclosed. In one aspect, the device includes a plurality of scan lines disposed over a substrate and configured to transfer a scan signal and a plurality of data lines electrically insulated from the scan lines and configured to transfer a data signal, wherein the data lines cross the scan lines. The device also includes a plurality of haptic control lines electrically insulated from the scan lines or the data lines and configured to transfer a haptic signal and a thin film transistor electrically connected to the scan lines and the data lines, wherein the thin film transistor is formed in each of a plurality of pixels. The device further includes a first electrode electrically connected to the thin film transistor, a second electrode facing the first electrode and an optical adjustment member disposed between the first and second electrodes.