Piezoelectric Touch Screen for Accurate Coordinate Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional resistance type touch screens face limitations in accuracy and durability due to complex structures and non-uniform thin film thickness, which affect touch coordinate determination and longevity.
Innovation Solution
A touch screen design featuring a substrate with first and second signal lines connected to piezoelectric switches, where the switches are turned on to determine touch coordinates, simplifying the structure and reducing manufacturing complexity, while using a conductive thin film for voltage application and a light-blocking layer for improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional resistance type touch screen structure is used, then the touch screen can achieve basic touch functionality, but the structure is complex and manufacturing is difficult
Solution Approach 1:
The patent extracts and removes the complex resistance thin film structure from the touch screen design. Instead of using multiple layers of conductive films and resistance networks, the invention uses a simplified structure with piezoelectric switches that directly convert mechanical pressure into electrical signals, eliminating the need for complex resistance film patterning and assembly
Solution Approach 2:
The patent replaces the mechanical resistance-based touch detection system with a piezoelectric-based system. The piezoelectric switches convert mechanical pressure directly into electrical signals through the piezoelectric effect, substituting the complex mechanical resistance measurement system with a simpler electro-mechanical conversion approach
2Measurement precision
If a conventional resistance type touch screen structure is used, then the touch screen can achieve basic touch functionality, but the manufacturing precision is insufficient affecting touch coordinate determination accuracy
Solution Approach 1:
The patent replaces the resistance-based measurement system with piezoelectric switching. Instead of measuring resistance changes that require precise thin film thickness control, the piezoelectric switches provide a direct binary signal (on/off) based on applied pressure, eliminating the need for high manufacturing precision in thin film deposition while maintaining accurate touch detection
Solution Approach 2:
The patent changes the detection parameter from continuous resistance measurement to discrete piezoelectric switch state detection. This parameter change allows for accurate touch coordinate determination without requiring uniform thin film thickness, as the piezoelectric switches provide clear on/off states that can be precisely located
3Reliability
If a conventional resistance type touch screen structure is used, then the touch screen can achieve basic touch functionality, but the durability is reduced
Solution Approach 1:
The patent removes the fragile resistance thin film structure that is prone to wear and degradation. By using piezoelectric switches integrated into the touch screen structure, the invention eliminates the need for multiple thin conductive films that can delaminate or degrade over time, thereby improving durability
Solution Approach 2:
The patent employs piezoelectric materials that combine mechanical sensitivity with electrical output in a single integrated component. This composite approach uses materials that are inherently more durable than separate thin film layers, as the piezoelectric material can be deposited as a single robust layer that maintains its properties over time
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 design enhances touch accuracy, reduces manufacturing costs, and extends the lifespan of the touch screen by simplifying the structure and utilizing a conductive thin film for voltage application and a light-blocking layer for improved accuracy.
Implementation Method 1
a first piezoelectric switch and a second piezoelectric switch provided in each touch region, wherein when the touch region is touched by a force, the first piezoelectric switch and the second piezoelectric switch are turned on
Data Source
AI summary
A touch screen and a manufacturing method thereof, and a color filter substrate and a manufacturing method thereof are provided in the invention. The touch screen comprises a substrate, a plurality of touch regions defined by a plurality of first signal lines and a plurality of second signal lines are provided on the substrate. In each touch region, the first signal line is connected with a first piezoelectric switch, the second signal line is connected with a second piezoelectric switch, when the touch region is touched by a force the first piezoelectric switch and the second piezoelectric switch are turned on and transfer voltage signals respectively via the first signal line and the second signal line to determine the coordinate of the touched touch region.