Display Input Sensor Trace Layout for Parasitic Capacitance
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Solution Overview
Problem
Existing display devices lack sufficient design freedom in the arrangement of sensing electrodes and trace lines, leading to inefficiencies in touch sensitivity and capacitance issues.
Innovation Solution
A display device with an input sensor design that includes overlapping sensing regions, featuring group electrodes and trace lines arranged in specific patterns to optimize sensing and reduce parasitic capacitance, with varying trace line lengths and resistances to enhance touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If trace lines are arranged in a regular grid pattern, then manufacturing is simplified, but parasitic capacitance increases and touch sensitivity decreases
Solution Approach 1:
The patent applies asymmetry by making trace line lengths unequal in the first direction. Specifically, trace lines extending from different sensing electrodes have different lengths, with at least one trace line being longer than others. This asymmetric arrangement reduces the overlap area between trace lines and sensing electrodes, thereby reducing parasitic capacitance and improving touch sensitivity while maintaining manufacturability through a systematic design approach.
2Measurement precision
If sensing electrodes are densely arranged, then sensing resolution improves, but parasitic capacitance between electrodes increases
Solution Approach 1:
The patent applies local quality by varying the characteristics of trace lines connected to different sensing electrodes. Specifically, trace lines have different lengths and configurations depending on their position and the sensing electrode they connect to. This localized optimization allows dense electrode arrangement for high resolution while managing parasitic capacitance through tailored trace line designs for each electrode.
3Area of stationary object
If trace line length is increased to cover larger sensing regions, then sensing area expands, but resistance increases and touch sensitivity decreases
Solution Approach 1:
The patent applies parameter changes by systematically varying trace line parameters (length, width, configuration) to optimize performance. Longer trace lines are designed with specific width adjustments or routing optimizations to maintain acceptable resistance levels. The parameter variations allow coverage of larger sensing regions while preserving touch sensitivity through compensated design parameters.
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 solution provides a display device with improved touch sensitivity and reduced parasitic capacitance, offering enhanced design flexibility and performance in touch sensing.
Implementation Method 1
reduced parasitic capacitance between touch electrode lines and touch electrodes by having openings in the touch electrodes lines so that the overlap area is reduced
Implementation Method 2
Respective resistances of the (i+1) th trace line and the (i+2) th trace line are different from each other
Data Source
Figure 1~2
Figure 3
Figure 4A
AI summary
Disclosed is a display device (DD) including an input sensor (200). The input sensor (200) includes a first group electrode (E1) and a second group electrode (E2) that overlap a sensing region (200-SA). A first group line (TL1) is connected to the first group line (TL1), and overlaps the sensing region (200-SA). The first group line (TL1) is substantially uniformly located in a first region of the sensing region (200-SA), and is located more densely in a second region of the sensing region (200-SA) than in the first region. A length of the first group line (TL1) located in the second region is less than that of the first group line (TL1) located in the first region.