Touch Panel Electrode Layout for Uniform Capacitance Detection
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Solution Overview
Problem
Capacitive type touch screen panels face accuracy issues due to non-uniform electrode widths and cover thickness, which affect capacitance detection and touch input accuracy.
Innovation Solution
The touch screen panel design includes first and second electrodes with varying widths, and a cover with non-uniform thickness, maintaining constant capacitance between electrodes to improve touch input accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform electrode widths are used in capacitive touch screen panels, then manufacturing is simplified, but touch input accuracy is reduced when cover thickness is non-uniform
Solution Approach 1:
The patent applies local quality by making electrode widths non-uniform to match the non-uniform cover thickness. Specifically, electrodes in regions with greater cover thickness are made wider, and electrodes in regions with lesser thickness are made narrower, so that the capacitance value remains substantially constant across all electrodes despite variations in cover thickness.
2Measurement precision
If non-uniform electrode widths are used to compensate for cover thickness variations, then touch input accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The patent changes the geometric parameter of electrode width to compensate for variations in cover thickness. By adjusting the width parameter of electrodes based on the underlying cover thickness, the capacitance value is maintained substantially constant, thereby improving touch input accuracy while managing the complexity through systematic parameter adjustment.
3Measurement precision
If uniform capacitance is maintained across all electrodes, then touch detection precision is improved, but electrode design becomes more complex
Solution Approach 1:
The patent applies preliminary anti-action by pre-compensating for the harmful effect of non-uniform cover thickness through non-uniform electrode width design. This preliminary adjustment ensures that the capacitance value remains substantially constant across all electrodes before touch detection occurs, thereby improving detection precision while systematically managing the design complexity.
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 touch input accuracy by maintaining consistent capacitance, regardless of cover thickness variations, thereby improving detection precision.
Implementation Method 1
a capacitive scheme which detects a touched portion by detecting a location where a change in voltage of the upper/lower plate according to a touch in a state in which an equipotentiality is formed on a conductive film
Data Source
AI summary
The present invention provides a touch screen panel and a display device which include a plurality of first electrodes arranged in a first direction in parallel; a plurality of second electrodes arranged in a second direction to intersect with the first electrodes; and a cover, wherein a width of at least one electrode of the first electrodes is different from widths of the other first electrodes, a width of at least one electrode of the second electrodes is different from widths of the other second electrodes, or the width of the at least one electrode of the first electrodes is different from the widths of the other first electrodes and the width of the at least one electrode of the second electrodes is different from the widths of the other second electrodes.