Transparent Conductive Layered Product Time Constant Correction
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Solution Overview
Problem
The detection accuracy of operating positions in projected capacitance touch panels is compromised due to differences in wiring length and electrical properties caused by branching around non-wiring regions, leading to variations in time constants that affect capacitance measurements.
Innovation Solution
A transparent conductive laminate with a correction pattern that adjusts capacitance values between reference and branch connection elements, reducing time constant differences by incorporating correction electrodes or varying wiring widths/shapes to maintain accurate capacitance measurements across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wirings branch around non-wiring regions to avoid placing accessories, then the peripheral region can accommodate sensors and cameras, but the wiring length differences cause time constant variations that decrease detection accuracy
Solution Approach 1:
The patent applies local quality by introducing correction patterns specifically in regions where wiring branching occurs near non-wiring regions. These correction patterns have different capacitance values than standard patterns, allowing localized compensation for time constant variations without affecting the entire panel. This enables flexible positioning of non-wiring regions while maintaining detection accuracy through targeted local adjustments.
Solution Approach 2:
The patent changes the capacitance parameter of specific correction patterns to compensate for time constant differences. By adjusting the capacitance values of correction patterns based on their position relative to non-wiring regions and branching wirings, the system maintains uniform time constants across all sensing electrodes despite wiring length variations, thereby preserving detection accuracy while allowing flexible non-wiring region placement.
2Measurement precision
If wirings are routed in straight lines without considering non-wiring regions, then wiring length is minimized, but wirings cannot be disposed in regions for placing accessories
Solution Approach 1:
The patent introduces correction patterns as intermediary elements between the sensing electrodes and the non-wiring regions. These correction patterns act as mediators that compensate for the electrical property variations caused by wiring routing around non-wiring regions. By placing correction patterns with adjusted capacitance values in specific locations, the system enables accessory placement in peripheral regions while maintaining uniform time constants and detection accuracy.
3Area of stationary object
If the peripheral region is reduced in size, then the overall panel size is minimized, but there is insufficient space for both wirings and accessory placement regions
Solution Approach 1:
The patent applies local quality by introducing correction patterns specifically in regions where wiring branching occurs near non-wiring regions. These correction patterns have different capacitance values than standard patterns, allowing localized compensation for time constant variations without affecting the entire panel. This enables flexible positioning of non-wiring regions while maintaining detection accuracy through targeted local adjustments.
Solution Approach 2:
The patent utilizes the spatial dimension by strategically positioning correction patterns in specific locations relative to non-wiring regions and branching wirings. By distributing correction patterns with different capacitance values across different regions, the system optimizes the use of peripheral space, allowing both wiring routing and accessory placement within a compact form factor while maintaining electrical performance.
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 solution enhances detection accuracy by minimizing time constant variations, allowing for flexible positioning of non-wiring regions and reducing the size of the peripheral region, while maintaining high detection precision and design freedom.
Implementation Method 1
a transparent dielectric layer located between the first electrode layer and the second electrode layer
Implementation Method 2
An electrostatic capacitance between the drive electrode and the sensing electrode which face each other decreases when a finger or the like touches an operating surface of the touch panel
Data Source
Figure 1~2
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Figure 6~7
AI summary
A first electrode layer in a transparent conductive laminate includes a plurality of first electrodes and a plurality of first wirings. Two adjacent first wirings form a wiring pair. The plurality of first wirings are divided into a plurality of connection elements, and each of the connection elements includes one or more first wirings. The plurality of connection elements include a reference connection element and a branch connection element which are adjacent to each other, and a path of the branch connection element branches from a path of the reference connection element. At least one of the first electrode layer and the second electrode layer includes a correction pattern, and the correction pattern is configured to reduce a time constant difference which occurs due to the branch between the two first wirings that constitute the wiring pair which extends over the reference connection element and the branch connection element.