Touch Routing Line Layout for Display Apparatus
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Solution Overview
Problem
Existing touch screen display apparatuses suffer from uneven parasitic capacitance between touch routing lines due to step differences, leading to degraded touch precision and increased non-display area requirements, which also causes signal delay due to longer line lengths.
Innovation Solution
The display apparatus incorporates a configuration where first touch routing lines are disposed under the first touch electrodes with all lines having substantially the same length in the non-display area, and a touch signal supply line is positioned in a direction crossing over the routing lines, minimizing parasitic capacitance variations and eliminating the need for additional vertical routing lines, thus enhancing touch precision and reducing signal delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch routing lines are arranged in the non-display area with different distances from the display area, then the touch screen can be implemented, but parasitic capacitance varies unevenly leading to degraded touch precision
Solution Approach 1:
The patent applies equipotentiality by designing touch routing lines that extend from the display area to the non-display area boundary at substantially equal distances. This ensures that all routing lines experience similar parasitic capacitance conditions, creating equipotential conditions for signal transmission. The routing lines are configured to maintain uniform length and spacing in the non-display area, eliminating the step differences that cause uneven parasitic capacitance in conventional designs.
2Adaptability or versatility
If additional non-display area is allocated for touch routing lines, then touch screen functionality is achieved, but signal delay increases due to longer line lengths
Solution Approach 1:
The patent utilizes the non-display area dimension efficiently by arranging routing lines to extend perpendicular to the display area boundary rather than parallel. This dimensional optimization allows routing lines to reach the edge of the non-display area with minimal length, reducing signal transmission distance and delay while still providing adequate space for touch screen operation.
3Adaptability or versatility
If touch routing lines are positioned at different distances from the display area, then routing flexibility is improved, but parasitic capacitance differences cause uneven electrical characteristics
Solution Approach 1:
The patent applies local quality by differentiating the arrangement of routing lines in different regions. In the display area, routing lines connect to touch electrodes with optimal spacing. In the non-display area, all routing lines are configured to extend to the boundary at equal distances with uniform spacing, ensuring consistent electrical characteristics. This localized optimization maintains routing flexibility where needed while ensuring uniformity where electrical performance is critical.
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 minimizes parasitic capacitance variations and reduces signal delay, improving touch precision and reducing the non-display area required for touch routing lines, resulting in a more efficient and accurate touch screen experience.
Implementation Method 1
touch routing lines disposed in the non-display area of the display panel and configured to receive the touch driving signal from the switching unit and supply the touch driving signal to the plurality of first touch electrodes
Data Source
AI summary
A display apparatus having a touch screen can include a display area and a non-display area; a plurality of first touch electrodes in the display area; a plurality of second touch electrodes crossing over the plurality of first touch electrodes; a gate driver in the non-display area and configured to generate gate signals; a switching unit in the non-display area of the display panel and configured to be controlled based on the gate signals; at least one touch signal supply line in the non-display area of the display panel and configured to supply a touch driving signal to the switching unit; a plurality of first touch routing lines in the non-display area and configured to receive the touch driving signal from the switching unit and supply the touch driving signal to the plurality of first touch electrodes; and a plurality of second touch routing lines in the non-display area of the display panel and configured to sense the plurality of second touch electrodes.