Capacitive Touch Screen Sensing Pattern Area Balancing
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Solution Overview
Problem
Capacitive touch screen panels often exhibit uneven touch sensitivity due to differences in base capacitance between sensing patterns aligned along the long and short sides of the screen, leading to reduced precision and increased errors in position detection.
Innovation Solution
The capacitive touch screen panel incorporates first and second sensing patterns with specific shape and size configurations, where the first patterns have concave portions and the second patterns have projection portions, ensuring that the base capacitance is identical in both directions, thereby enhancing touch sensitivity by adjusting the areas and shapes of these patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the sensing patterns are arranged with uniform area and shape, then the manufacturing process is simple, but the base capacitance varies between long-side and short-side directions causing uneven touch sensitivity
Solution Approach 1:
The patent applies local quality by making the sensing patterns have different areas depending on their orientation. Specifically, sensing patterns in the first direction have a first area while those in the second direction have a second area, where the areas are specifically designed to compensate for base capacitance differences. This local differentiation ensures uniform touch sensitivity across the screen while maintaining manufacturability through systematic area variation.
Solution Approach 2:
The patent changes the area parameter of the sensing patterns to resolve the contradiction. By adjusting the area of sensing patterns based on their orientation (first direction vs. second direction), the base capacitance values are equalized. This parameter change transforms the system from having uniform but imbalanced capacitance to having varied but balanced capacitance, achieving uniform touch sensitivity.
2Measurement precision
If the base capacitance is reduced to enhance touch sensitivity, then position detection precision improves, but the manufacturing complexity increases due to specific area requirements
Solution Approach 1:
The patent resolves this contradiction by applying local quality through systematic area differentiation. Rather than making all sensing patterns have different areas, it creates a predictable pattern where first-direction patterns have area A1 and second-direction patterns have area A2. This localized, systematic approach achieves the required base capacitance reduction for enhanced touch sensitivity while keeping the manufacturing process relatively simple through clear area specifications.
3Reliability
If the sensing patterns have different areas to balance base capacitance, then touch sensitivity is enhanced, but the pattern design complexity increases
Solution Approach 1:
The patent applies asymmetry by intentionally creating asymmetric area relationships between sensing patterns in different directions. Specifically, the area of sensing patterns in the first direction is made different from the area of sensing patterns in the second direction. This asymmetric design is necessary to compensate for the inherent asymmetric capacitance distribution in the display panel, thereby enhancing touch sensitivity reliability.
Solution Approach 2:
The patent uses parameter changes by systematically varying the area parameter of sensing patterns based on their orientation. By defining specific area values or relationships for first-direction versus second-direction patterns, the design achieves balanced base capacitance. This parameter-based approach manages design complexity through clear, rule-based area specifications rather than ad-hoc adjustments.
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 balances base and touch capacitance, reducing errors in position detection and enhancing overall touch sensitivity, ensuring precise and uniform touch recognition across the screen.
Implementation Method 1
The capacitive touch screen panel converts a contact position into an electrical signal by sensing a change in capacitance between a conductive sensing pattern and an adjacent sensing pattern, ground electrode, or the like when a user's hand or object is in contact with the touch screen panel.
Data Source
Figure 1
Figure 2A~2C
Figure 3A~3C
AI summary
A capacitive touch screen panel including a plurality of first sensing patterns (12a, 12a') connected along a long-side direction of a screen; and a plurality of second sensing patterns (12b, 12b') connected along a short-side direction of the screen, wherein an area of each of the first sensing patterns (12a, 12a') is smaller than an area of each of the second sensing patterns (12b, 12b').