Piezoelectric Force Sensing Array in Display Panels
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Solution Overview
Problem
Current pressure sensing technologies in display technology, such as in mobile phones and tablets, face challenges in achieving high accuracy without significant modifications to the hardware and are limited by large assembly tolerances.
Innovation Solution
A display panel design incorporating a force sensing array with a substrate, pixel units, lower and upper sensing electrodes, a piezoelectric layer, and leads laminated sequentially, allowing for precise pressure detection and integration into flexible or non-flexible display panels, enabling three-dimensional touch and bending sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an additional mechanism is incorporated into the backlight portion or intermediate frame to achieve pressure sensing, then pressure sensing capability is added, but device complexity and hardware modification increase
Solution Approach 1:
The patent combines the pressure sensing function with the display panel structure by integrating the piezoelectric layer between the lower and upper electrode layers that are already part of the display panel. This merging approach adds pressure sensing capability without requiring separate additional mechanisms in the backlight portion or intermediate frame, thereby reducing device complexity while maintaining adaptability.
Solution Approach 2:
The electrode layers in the display panel are designed to serve dual functions: as display electrodes for visual output and as sensing electrodes for pressure detection. The piezoelectric layer enables these existing structural elements to perform the additional function of pressure sensing, achieving multi-functionality without increasing hardware complexity.
2Ease of manufacture
If assembly tolerance is large in the additional mechanism, then manufacturing is easier, but detection accuracy is limited
Solution Approach 1:
The patent replaces the mechanical pressure sensing mechanism with an electric field-based detection system. The piezoelectric layer converts mechanical pressure directly into electrical signals that can be precisely measured by the electrode layers, substituting a tolerance-prone mechanical assembly with an electronic detection system that achieves high detection accuracy while maintaining ease of manufacture.
3Measurement precision
If a piezoelectric layer is integrated between electrode layers in the display panel, then detection accuracy improves, but manufacturing complexity increases
Solution Approach 1:
The piezoelectric layer is integrated into the display panel structure during the existing manufacturing process, before the display panel is assembled into the final device. By performing the piezoelectric layer integration as a preliminary action during panel fabrication rather than as a post-assembly modification, the patent achieves high detection accuracy while minimizing the increase in manufacturing complexity.
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 solution enhances pressure sensing accuracy and allows for precise detection of touch location and force levels, enabling advanced control commands, such as zooming and screen navigation, while minimizing hardware modifications and maintaining compatibility with various display types.
Implementation Method 1
a piezoelectric layer (303) disposed between the plurality of lower sensing electrodes (302) and the plurality of upper sensing electrodes (304)
Data Source
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AI summary
The present disclosure relates to a display panel, a method for manufacturing the same and a display device. The display panel includes: a substrate; pixel units; and a force sensing array, the force sensing array comprises lower leads, lower sensing electrodes, a piezoelectric layer, upper sensing electrodes and upper leads; wherein lower sensing electrodes and upper sensing electrodes are aligned with each other one by one, and arranged in an array, and each of lower sensing electrodes and each of upper sensing electrodes form a force sensing unit with the piezoelectric layer therebetween; and wherein each of the plurality of lower leads and each column of the force sensing units are aligned with each other one by one, and each of the plurality of upper leads and each row of the force sensing units are also aligned with each other one by one. According to the present disclosure, it is possible to realize a pressure sensing with high detection accuracy in the case where the hardware of the display panel is not substantially changed.