Touch Panel Built-in Display Peripheral Pressed State Detection
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Solution Overview
Problem
Existing capacitive touch panels struggle with lower detection accuracy of the pressed state in the display region compared to the peripheral region, as existing configurations either lack the ability to detect the pressed state or are designed for the display region only, limiting the effectiveness of touch position and pressed state detection.
Innovation Solution
A touch panel built-in display with a flexible protective plate and sensor electrodes (first, second, and third electrodes) is designed to detect the pressed state in the peripheral region by measuring changes in capacitance between the second and third electrodes, with the first electrode positioned on the back surface of the protective plate and the second and third electrodes adjacent on the sensor substrate, allowing for accurate detection of the pressed state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pressed state detection configuration is provided in the display region, then the touch panel can detect the pressed state, but the detection accuracy is lower due to smaller degree of curvature
Solution Approach 1:
The patent applies local quality by placing the pressed state detection configuration specifically in the peripheral region rather than uniformly across the entire surface. The peripheral region has a larger degree of curvature when pressed, providing better detection characteristics. This localized approach allows the system to leverage the natural deformation characteristics of specific areas to achieve higher detection accuracy.
2Strength
If a robust protective plate is used, then the protective plate can withstand touch operations, but the light transmittance and reflectance may be compromised
Solution Approach 1:
The patent employs a flexible protective plate that can deform under touch operations while maintaining its structural integrity. The flexibility of the protective plate allows it to conform to the curvature changes during pressing, enabling accurate detection without requiring the plate to be overly rigid. This flexible design maintains both robustness and optical properties.
3Strength
If the protective plate is made thicker for robustness, then the protective plate can better withstand damage, but the degree of curvature during pressing is reduced, lowering detection accuracy
Solution Approach 1:
The patent applies local quality by placing the pressed state detection configuration specifically in the peripheral region rather than uniformly across the entire surface. The peripheral region has a larger degree of curvature when pressed, providing better detection characteristics. This localized approach allows the system to leverage the natural deformation characteristics of specific areas to achieve higher detection accuracy.
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 configuration enhances detection accuracy of the pressed state in the peripheral region, improving sensitivity and enabling robust protective plates to be used without compromising light transmittance or reflectance, thus addressing the limitations of existing technologies.
Implementation Method 1
A projected capacitive touch panel has been proposed. The projected capacitive method is a method of detecting a touch position based on change in capacitance between a plurality of adjacent touch sensor electrodes.
Implementation Method 2
The touch panel built-in display detects the pressed state in which the protective plate is pressed based on change in capacitance between the second electrode and the third electrode accompanying change in a distance from the first electrode to the second electrode and a distance from the first electrode to the third electrode.
Data Source
AI summary
The touch panel built-in display includes a first electrode, a second electrode, and a third electrode for detecting the pressed state in which the protective plate is pressed. The first electrode is provided in the peripheral region on the back surface of the protective plate. The second and third electrodes are provided adjacent to each other in the peripheral region on the principal surface of the sensor substrate. That is, the first electrode, the second electrode, and the third electrode are provided in the peripheral region as a configuration for detecting the pressed state.