Segmented Touch Drive Lines for Pressure Sensitivity
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Solution Overview
Problem
The in-cell touch structure in existing touch panel technologies has limitations in pressure sensitivity detection, as the touch drive lines and sense lines are perpendicularly crossed, making it difficult to enhance touch sensitivity effectively.
Innovation Solution
A capacitive touch panel design featuring touch drive lines with a segmented structure and a metal layer in an 'S' shape or curved structure in the deformation area, where the insulating substrate and metal layer facilitate deformation, while the touch sense lines remain rigid, allowing for capacitance changes to detect pressure variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If touch drive lines and sense lines are perpendicularly crossed in an in-cell touch structure, then structural integration is improved, but pressure detection sensitivity deteriorates
Solution Approach 1:
The touch drive lines are divided into multiple segments with spacing therebetween, creating a segmented structure that allows differential deformation under pressure. This segmentation enables the drive lines to respond more sensitively to pressure changes while maintaining the integrated in-cell structure.
Solution Approach 2:
The touch drive lines are designed with flexibility to deform under pressure, creating a dynamic response system. The segmented structure allows the drive lines to change their configuration dynamically when pressure is applied, enabling the system to detect pressure variations through capacitance changes.
2Measurement precision
If touch drive lines are made flexible to improve pressure sensitivity, then pressure detection sensitivity is improved, but manufacturing precision deteriorates
Solution Approach 1:
The touch drive lines are segmented with defined spacing between segments. This segmentation approach allows for controlled flexibility while maintaining manufacturability, as the spacing can be precisely controlled during the manufacturing process using standard photolithography techniques.
Solution Approach 2:
The patent optimizes parameters such as the spacing between drive line segments, the thickness of the dielectric layer, and the dimensions of the touch sensors to achieve the desired balance between flexibility and manufacturing precision. These parameter adjustments enable pressure sensitivity improvement without compromising manufacturing capabilities.
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 improves touch pressure sensitivity by detecting changes in capacitance values between touch drive and sense lines, enabling differentiation between light and heavy presses, and simplifies the manufacturing process with fewer masks required, reducing costs.
Implementation Method 1
detecting changes in capacitance values between touch drive and sense lines
Implementation Method 2
the insulating substrate and metal layer facilitate deformation
Data Source
AI summary
An embedded touch panel and a manufacturing method are provided. Touch drive lines of a touch panel adopt a segmented structure design so that spacings between the touch drive lines and the touch sense lines are changed, and changes of the spacings cause changes of capacitance values between the touch drive lines and the touch sense lines. Through detecting an amount of change of the capacitance value, a magnitude of a user's pressing force is determined to make a further judgment as to whether it is a light press or a heavy press so as to retrieve a corresponding instruction. Only four masks are needed to fabricate the structure of the touch circuit lines. The manufacturing process is relatively simple to reduce the manufacturing cost.