Piezoelectric Touch Screen Sensing Layer for Low Power Pressure Detection
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Solution Overview
Problem
Current touch screens, such as resistive and capacitive types, face limitations in sensing non-conductive objects, have high power consumption, and lack sensitivity and multi-point touch capabilities.
Innovation Solution
A touch screen utilizing a transparent piezoelectric sensing layer between oppositely disposed electrodes, which converts pressure from any object into an electric signal, reducing power consumption and enabling precise position and force sensing without requiring a conductor for touch operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If resistive touch screen is used, then structure is simple and cost is low, but transmission rate is low and power consumption is high
Solution Approach 1:
The patent replaces the mechanical pressure-sensing mechanism of resistive touch screens with a capacitive sensing mechanism. The touch screen includes a capacitive sensing layer that detects touch through electrical field changes rather than mechanical contact, eliminating the need for multiple conductive layers and reducing overall device complexity while lowering power consumption.
Solution Approach 2:
The patent changes the sensing mechanism from mechanical resistance measurement to capacitive coupling detection. By using a capacitive sensing layer with specific dielectric properties and electrode configurations, the system detects touch through changes in electrical field parameters rather than mechanical pressure, achieving both structural simplification and reduced power consumption.
2Use of energy by stationary object
If capacitive touch screen is used, then transmission rate is high and power consumption is low, but precision is not enough and conductor or capacitive pen is required
Solution Approach 1:
The patent implements a grid arrangement of electrode fingers in the capacitive sensing layer, creating localized sensing zones with high precision. Each intersection of electrode fingers forms a discrete sensing point, enabling precise touch detection without requiring conductive materials or specialized pens, while maintaining low power consumption through the capacitive mechanism.
3Area of stationary object
If large detection area with high number of lines is used, then detection coverage is increased, but load of processor increases and power consumption is high
Solution Approach 1:
The patent divides the touch sensing area into a matrix of electrode fingers arranged in rows and columns, creating segmented sensing zones. This segmentation allows the system to detect touch position through the intersection points of the grid, providing large-area coverage with reduced processing load compared to continuous scanning methods, while maintaining low power consumption through capacitive sensing.
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 touch screen effectively senses pressure, position, and force changes from any object, offering sensitive and multi-point touch support with reduced power consumption, enhancing user experience and visual-acoustic enjoyment.
Implementation Method 1
The sensing layer is made of transparent material having piezoelectric effect
Data Source
AI summary
A touch screen includes a first electrode and a second electrode that are disposed oppositely, and a sensing layer disposed between the first electrode and the second electrode. The sensing layer is made of transparent material having piezoelectric effect. The touch screen can sense pressure by any object, and therefore cannot only sense a position of a contact, but also sense a magnitude and a change characteristic of acting force. Also, the touch screen according to the present disclosure directly converts the pressure applied by the object onto the touch screen into an electric signal, which reduces the power consumption greatly, and therefore reduces whole power consumption of the screen effectively.