Touch Screen Sensing Lines with Variable Widths for Signal Equalization
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Solution Overview
Problem
Touch screens face challenges in accurately detecting touch events due to electrical characteristic differences in sensing lines, which distort signals and inhibit precise recognition, especially between touch electrodes close to and far from the pad unit.
Innovation Solution
The design includes a touch screen with a base substrate featuring a sensing area and peripheral area, where sensing lines connected to touch electrodes have varying line widths, with narrower lines closer to the pad unit, and a divided sensing area with different-sized touch electrodes and dummy electrodes to equalize electrical characteristics, minimizing signal distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sensing lines have uniform line widths, then manufacturing is simple, but electrical characteristics vary due to different line lengths causing signal distortion
Solution Approach 1:
The sensing lines are designed with different line widths in different regions. Specifically, sensing lines in the first region (farther from pad unit) have a first line width, while sensing lines in the second region (closer to pad unit) have a second line width that is narrower than the first line width. This local variation in line width compensates for the difference in line lengths, equalizing the electrical characteristics (resistance and capacitance) of sensing lines across different regions, thereby reducing signal distortion and improving touch event detection accuracy.
2Measurement precision
If sensing lines are made narrower to reduce capacitance, then electrical characteristics equalize, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the line width parameter of sensing lines based on their position. By adjusting the line width parameter (making it narrower in the second region and wider in the first region), the patent equalizes the electrical characteristics of sensing lines with different lengths. This parameter change approach allows achieving uniform electrical characteristics while using standard manufacturing processes, avoiding the need for excessively high manufacturing precision.
3Ease of manufacture
If all touch electrodes are made the same size, then manufacturing is straightforward, but electrical characteristics differ due to position
Solution Approach 1:
The touch electrodes are designed with different sizes depending on their position. Touch electrodes in the first region have a first size, while touch electrodes in the second region have a second size. This local variation in electrode size compensates for the difference in sensing line lengths, ensuring that the electrical characteristics (capacitance and resistance) are equalized across all touch electrodes, thereby improving touch recognition consistency and reliability.
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 improves touch recognition rates by equalizing electrical characteristics between touch electrodes, leading to more accurate detection of touch events and enhanced user input processing.
Implementation Method 1
since line lengths of sensing lines connected to the touch electrodes adjacent to the pad unit are short, the resistance value and the capacitance value of the sensing lines are relatively low, and since line lengths of sensing lines connected to the touch electrodes far away from the pad unit are long, the resistance value and the capacitance value of sensing lines are relatively high
Implementation Method 2
the resistance value and the capacitance value of the sensing lines are relatively low
Data Source
AI summary
The present disclosure relates to a touch screen which includes: a base substrate including a sensing area and a peripheral area enclosing an edge of the sensing area; a first touch electrode disposed in the sensing area and extending in a first direction; a second touch electrode disposed in the sensing area and extending in a second direction which crosses the first direction; a plurality of sensing lines disposed in the peripheral area, wherein one ends of the sensing lines are respectively connected to the first touch electrode and the second touch electrode; and a pad unit disposed in the peripheral area and connected to the other end of each of the sensing lines to electrically connect the sensing lines to a driving circuit, wherein the sensing lines have different line widths.