Touch Panel Electrode Patterns for Accurate Input Recognition
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Solution Overview
Problem
Existing touch panels, particularly self-capacitance and mutual capacitance types, face issues with coordinate detection errors due to signal size differences and high power consumption when using a stylus pen as a transmission unit, limiting accurate input recognition regardless of the input means.
Innovation Solution
A touch panel structure featuring electrode patterns with electrode lines arranged in different widths and spaces, allowing for precise coordinate detection by distinguishing between finger and stylus pen inputs through varying signal processing, enabling accurate touch input recognition using a self-capacitance type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a self-capacitance type touch panel with uniform electrode patterns is used, then the structure is simple and manufacturing is easy, but coordinate detection errors occur due to signal size differences when touched at different positions
Solution Approach 1:
The patent applies local quality by varying the spacing between electrode lines in different regions of the touch panel. Specifically, the spacing between adjacent first electrode lines in the first direction and the spacing between adjacent second electrode lines in the second direction are set to be different, creating non-uniform local characteristics that compensate for position-dependent signal variations and improve coordinate detection accuracy across the entire touch surface.
Solution Approach 2:
The patent changes the geometric parameters of the electrode patterns by setting different spacing intervals between electrode lines in different directions and regions. This parameter modification allows the touch panel to maintain simple manufacturing processes while achieving uniform signal characteristics and accurate coordinate detection across all touch positions.
2Measurement precision
If a mutual capacitance type touch panel is used with a stylus pen as transmission unit, then precise touch detection is possible, but power consumption becomes relatively large
Solution Approach 1:
The patent achieves multi-functionality by designing a self-capacitance type touch panel that can accurately detect both finger touches and stylus pen inputs through its non-uniform electrode patterns. This eliminates the need for separate mutual capacitance structures specifically optimized for stylus detection, thereby reducing overall system complexity and power consumption while maintaining precise touch detection capability for multiple input types.
3Measurement precision
If electrode lines are arranged with different widths and spaces, then input sensitivity and coordinate detection precision are improved, but device structure becomes more complex
Solution Approach 1:
The patent segments the electrode pattern into two orthogonal sets of electrode lines (first electrode lines in the first direction and second electrode lines in the second direction), with each set having different spacing characteristics. This segmentation allows independent optimization of spacing in each direction to achieve uniform signal distribution and accurate coordinate detection, while the modular segmented structure actually simplifies the overall design compared to completely irregular patterns.
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
The touch panel achieves improved input sensitivity and precise coordinate detection, allowing for accurate recognition of both finger and stylus pen inputs, reducing coordinate detection errors and power consumption.
Implementation Method 1
In the capacitance type touchscreen, the subject of sensing should be a conductor, and a predetermined contact area is required in order to change the sensible capacitance
Implementation Method 2
The resistance film type touchscreen senses direct contact of two thin conduction layers on the screen by pressure applied onto the layers by a user's finger or stylus pen
Data Source
AI summary
A touch panel is provided including at least one first electrode pattern including a plurality of electrode lines arranged in a first direction; and at least one second electrode pattern including a plurality of second electrode lines arranged in a second direction to intersect the first electrode lines; wherein the first electrode lines are spaced apart at different intervals from one another in the first direction.