Capacitive Touch Screen Panel with Inclined Bridge Patterns
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Capacitive touch screen panels face reduced touch sensitivity due to differences in transverse and longitudinal directions, leading to variations in base capacitance and touch capacitance, which affects the accuracy of position detection.
Innovation Solution
The touch screen panel design includes first and second sensing patterns with different areas, inclined bridge patterns, and dummy patterns made of transparent conductive material, positioned on an upper substrate to minimize interference with display pixels and improve visibility, with the bridge patterns and dummy patterns optimized to reduce base capacitance and enhance touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If sensing patterns are connected more in the long side direction to cover the screen area, then the base capacitance increases, but the touch sensitivity decreases
Solution Approach 1:
The patent applies local quality by making the sensing patterns have different areas in different regions. Specifically, the first sensing patterns have a first area while the second sensing patterns have a second area, creating non-uniform capacitance distribution. This allows the base capacitance to be increased in certain regions for better screen coverage while maintaining touch sensitivity in other regions, thus resolving the contradiction between overall screen coverage and local touch sensitivity.
Solution Approach 2:
The patent employs asymmetry by designing the first and second sensing patterns with different areas rather than using uniform patterns. The first sensing patterns have a first area and the second sensing patterns have a second area, creating an asymmetric capacitance distribution across the screen. This asymmetric design enables different base capacitance values in different directions, allowing optimization of both screen coverage and touch sensitivity.
2Ease of manufacture
If uniform sensing patterns are used across the screen, then the manufacturing is simple, but the touch sensitivity varies in different directions
Solution Approach 1:
The patent implements local quality by varying the area of sensing patterns in different regions. The first sensing patterns have a first area while the second sensing patterns have a second area, creating localized differences in capacitance. This allows each region to be optimized for its specific functional requirements, improving touch sensitivity uniformity while maintaining manufacturing feasibility through standard photolithography processes.
Solution Approach 2:
The patent applies parameter changes by modifying the area parameter of the sensing patterns. Instead of using uniform patterns, the patent varies the area parameter to create first sensing patterns with a first area and second sensing patterns with a second area. This parameter variation enables different base capacitance values in different directions, achieving uniform touch sensitivity across the screen.
3Ease of manufacture
If bridge patterns are arranged horizontally or vertically to connect sensing patterns, then the connection is straightforward, but the visibility of display pixels is reduced due to interference
Solution Approach 1:
The patent applies dimensionality change by orienting the bridge patterns at an angle rather than horizontally or vertically. The bridge patterns are arranged to connect the first and second sensing patterns with an angular orientation, which moves the connection path into a different dimensional arrangement. This angular configuration reduces the overlap with vertically or horizontally arranged display pixels, thereby improving visibility while maintaining electrical connectivity.
Solution Approach 2:
The patent employs asymmetry in the bridge pattern arrangement by using angular orientations rather than symmetric horizontal or vertical alignments. The bridge patterns are positioned at angles that create asymmetric spacing relative to the display pixels, reducing interference. This asymmetric angular arrangement allows the bridge patterns to connect sensing patterns effectively while minimizing their impact on pixel visibility.
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 enhances touch sensitivity by balancing base and touch capacitance across the screen, reducing errors in position detection and improving visibility by minimizing interference with display pixels.
Implementation Method 1
A capacitive touch screen panel converts a contact position into an electric signal by sensing change of electrostatic capacity. The change of electrostatic capacity is generated by a conductive sensing pattern in association with other sensing patterns or a ground electrode.
Implementation Method 2
The capacitive touch screen panel converts a contact position into an electric signal by sensing change of electrostatic capacity.
Data Source
AI summary
The present embodiments provide a touch screen panel. The touch screen panel may include: a plurality of first sensing patterns connected to each other in a long side direction of a screen, the plurality of first sensing patterns having at least one indenting unit inwardly indented from respective sides of a polygon; and a plurality of second sensing patterns connected to each other in a short side direction of the screen, the second sensing patterns having at least one protrusion protruding outwardly from respective sides of a polygon. Vertical and horizontal edges of the first sensing patterns and the second sensing patterns are tilted by a predetermined angle.