Pressure Sensing Display With Compressible Layer For 3D Touch
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Solution Overview
Problem
Current touch technologies, such as 2D multi-touch, lack the capability to effectively sense pressing forces in the Z-axis, limiting their ability to provide 3D touch control and intuitive input interfaces.
Innovation Solution
A pressure sensing display is developed, comprising a first substrate with a TFT array, a first sensing element, a second sensing element, and a compressible layer, where the first sensing element is disposed on one surface and the second sensing element is disposed opposite to it, with the compressible layer in between, forming a capacitor that changes capacitance upon pressure, allowing for the determination of pressing position and intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional 2D multi-touch technology is used, then the touch device can provide a user-friendly and intuitive input interface for 2D touch control, but it lacks the capability to sense pressing forces in the Z-axis, limiting 3D touch control functionality
Solution Approach 1:
The patent transitions from 2D touch sensing to 3D touch sensing by adding a vertical dimension measurement capability. This is achieved by stacking multiple sensing elements (first sensing element, second sensing element, third sensing element) at different depths within the substrate, enabling detection of touch position and pressing force intensity along the Z-axis direction.
Solution Approach 2:
The patent embeds multiple sensing elements within the substrate structure in a nested configuration. The first, second, and third sensing elements are positioned at different depths within the same spatial footprint, allowing simultaneous measurement of touch position and pressing force without requiring additional lateral space.
2Adaptability or versatility
If multiple sensing elements are stacked to enable 3D touch sensing, then pressing force in the Z-axis can be sensed, but the device structure becomes more complex
Solution Approach 1:
The patent makes the sensing elements multi-functional by designing them to perform both touch position detection and pressing force sensing. The same stacked sensing element configuration that detects vertical position differences also measures pressing force intensity through capacitance changes, eliminating the need for separate sensing systems.
Solution Approach 2:
The patent combines multiple sensing functions into a single integrated structure. The first, second, and third sensing elements are merged within the same substrate region, and their combined output signals provide both 2D touch position and 3D pressing force information, reducing overall system 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
Enables 3D touch control by varying capacitance values based on pressure, allowing for the generation of corresponding control functions and enhancing the usability of touch-controlled devices with intuitive input interfaces.
Implementation Method 1
forming a capacitor that changes capacitance upon pressure
Implementation Method 2
the compressible layer is disposed between the first sensing element and the second sensing element
Data Source
AI summary
A pressure sensing display includes a first substrate, a thin film transistor (TFT) array, a first sensing element, a second sensing element and a compressible layer. The first substrate has a first surface and a second surface, and the first surface is opposite to the second surface. The TFT array is disposed on the first surface. The first sensing element is disposed on the second surface. The second sensing element is disposed opposite to the first sensing element. The compressible layer is disposed between the first sensing element and the second sensing element. A manufacturing method of the pressure sensing display is also disclosed.