Touch Routing Lines on Encapsulation Slope for Narrow Bezel
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Solution Overview
Problem
Touch display devices face challenges in minimizing bezel size and preventing parasitic capacitance, which affects touch sensitivity due to the presence of touch routing lines connecting the touch sensor to the touch sensing circuit.
Innovation Solution
A touch display device with a multilayer structure for touch routing lines, where the lines are arranged to avoid overlapping with the common electrode, using different metals and staggered layers to reduce bezel size and parasitic capacitance, and incorporating a power transmission pattern to improve touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch routing lines are disposed in a non-display area to connect touch sensor to touch sensing circuit, then touch functionality is enabled, but parasitic capacitance is increased and bezel size becomes larger
Solution Approach 1:
The patent applies dimensionality change by transitioning from a planar routing structure to a three-dimensional structure utilizing the inclined surface of the encapsulation layer. Touch routing lines are configured to extend along the inclined surface from the display area to the non-display area, effectively using the vertical dimension created by the encapsulation layer's slope to route signals while minimizing overlap with the common electrode and reducing parasitic capacitance.
Solution Approach 2:
The routing path is segmented into multiple sections: routing lines in the display area, routing lines along the inclined surface of the encapsulation layer, and routing lines in the non-display area. This segmentation allows each section to be optimized independently for minimizing parasitic capacitance while maintaining touch functionality.
2Adaptability or versatility
If touch routing lines are disposed in a non-display area, then touch signal transmission is achieved, but bezel size becomes larger
Solution Approach 1:
The patent utilizes the vertical dimension provided by the encapsulation layer's inclined surface to route touch signals. By having routing lines extend along the slope of the encapsulation layer rather than horizontally across the bezel area, the effective bezel width is reduced while maintaining complete touch signal transmission pathways.
3Device complexity
If touch routing lines overlap with common electrode, then routing path is simplified, but parasitic capacitance is increased reducing touch sensitivity
Solution Approach 1:
The patent extracts the routing path from the area where it would overlap with the common electrode by utilizing the inclined surface of the encapsulation layer. This separation removes the source of parasitic capacitance generation while maintaining the necessary electrical connections for touch functionality.
Solution Approach 2:
The encapsulation layer's inclined surface serves as an intermediary medium that enables touch routing lines to connect the touch sensor to the sensing circuit without directly overlapping the common electrode. This intermediate pathway reduces parasitic capacitance while maintaining routing functionality.
Data Source
AI summary
Embodiments of the present disclosure relate to a touch display device, and more particularly, to a touch display device which can have a small bezel size even when touch routing lines connecting a touch sensor to a touch sensing circuit are disposed in a non-display area and which can improve touch sensitivity by preventing or minimizing the formation of parasitic capacitance that can be caused by the touch routing lines.