Touch Panel Electrode Zoning for Fingerprint Sensing Cost Control
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Solution Overview
Problem
Current touch panels incur increased costs when high-density touch electrodes are used for fingerprint recognition across all areas, as they are also required for touch operations, making it inefficient and costly to perform both functions effectively.
Innovation Solution
A touch panel design with distinct first and second touch areas, where the first touch area has a higher density of touch electrodes for fingerprint identification and the second area has a lower density for regular touch operations, along with a control device that detects capacitance variations and duration to differentiate between the two operations, thereby optimizing electrode density and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-density touch electrodes are used across all areas for fingerprint recognition, then fingerprint identification accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent applies local quality by configuring high-density touch electrodes specifically in the first touch area designated for fingerprint recognition, while using low-density electrodes in the second touch area for general touch operations. This localized differentiation ensures high fingerprint identification accuracy only where needed, avoiding the increased manufacturing costs that would result from uniformly high-density electrodes across the entire touch panel.
Solution Approach 2:
The touch panel is segmented into distinct functional zones: a first touch area with high-density electrodes for fingerprint recognition and a second touch area with low-density electrodes for regular touch operations. This segmentation allows the system to optimize electrode density according to specific functional requirements, thereby achieving accurate fingerprint identification without incurring the prohibitive costs of full-panel high-density electrode implementation.
2Ease of operation
If high-density touch electrodes are used across all areas, then touch operation sensitivity is improved, but device complexity increases
Solution Approach 1:
The patent implements local quality by assigning high electrode density only to the first touch area where fingerprint recognition requires enhanced sensitivity, while the second touch area maintains lower density sufficient for standard touch operations. This approach improves touch sensitivity precisely where needed without unnecessarily increasing device complexity across the entire panel.
Solution Approach 2:
The touch panel structure is segmented into functionally distinct regions with different electrode densities. The first touch area employs high-density electrodes optimized for fingerprint recognition sensitivity, while the second touch area uses lower-density electrodes adequate for general interaction. This segmentation achieves targeted sensitivity improvement while avoiding the uniform complexity increase that would result from high-density electrodes throughout.
3Measurement precision
If high-density touch electrodes are used across all areas for fingerprint recognition, then fingerprint identification capability is improved, but electrode material consumption increases
Solution Approach 1:
The patent applies local quality by concentrating high-density electrode configurations exclusively in the first touch area where fingerprint identification capability is required. The second touch area utilizes lower-density electrodes, thereby maintaining effective fingerprint recognition functionality while significantly reducing the overall consumption of electrode materials compared to a uniform high-density design.
Solution Approach 2:
The touch panel is segmented into a first touch area with high-density electrodes for fingerprint recognition and a second touch area with low-density electrodes for general use. This segmentation ensures that high material consumption is localized only to the extent necessary for achieving reliable fingerprint identification capability, thereby optimizing the balance between functional performance and material resource utilization.
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 allows for effective fingerprint identification and touch operations while reducing costs by using high-density electrodes only where necessary, improving accuracy through capacitance and duration threshold detection and minimizing parasitic capacitance.
Implementation Method 1
when a user performs a fingerprint identification operation through the touch panel, a capacitance between touch electrodes in the corresponding area changes. Through the detection of the capacitance variation, the fingerprint of the user can be identified
Data Source
AI summary
The disclosure provides a touch panel, a control method and a control device thereof, and a display device. The touch panel comprises at least one first touch area and at least one second touch area, wherein a density of touch electrodes in the first touch area is greater than a density of touch electrodes in the second touch area.