OLED Touch Electrode Grid Layout for Narrow-Bezel Signal Integrity
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Solution Overview
Problem
Existing OLED-based touch structures face challenges in achieving lightweight, flexible, and narrow border designs while maintaining effective signal transmission and grounding for touch functionality.
Innovation Solution
The display panel incorporates a touch panel with multiple touch electrodes and grounding wires, including auxiliary grounding wires and dummy line segments, arranged in a specific border region to optimize signal lead and grounding configurations, ensuring orthographic projections and overlapping patterns for efficient signal transmission and grounding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a flexible covering surface type touch structure is used with a flexible touch substrate arranged on an encapsulation layer, then the device achieves lightweight, small thickness, and foldability, but the border width increases and signal transmission integrity deteriorates
Solution Approach 1:
The touch electrode is divided into multiple grid patterns (first grid pattern, second grid pattern, third grid pattern) arranged in different orientations. This segmentation allows the signal lead to connect with multiple separated electrode segments, improving signal transmission integrity while maintaining a narrow border width, as the segmented electrodes can be distributed more efficiently within the constrained border region.
Solution Approach 2:
The patent transitions from conventional linear or simple patterned touch electrodes to a two-dimensional grid pattern structure. The grid patterns are arranged in multiple dimensions (first direction, second direction, third direction) and connect to the signal lead through vertical and horizontal connections. This dimensional transformation enables better signal distribution and integrity within the narrow border region while maintaining flexibility.
2Reliability
If the touch electrode uses a simple linear structure, then the manufacturing process is simpler, but the signal transmission efficiency and grounding effectiveness deteriorate
Solution Approach 1:
The patent combines multiple grid patterns (first, second, and third grid patterns) with different orientations into a unified touch electrode structure. These merged grid patterns work together to provide multiple signal transmission paths, improving signal transmission efficiency and grounding effectiveness while distributing the structural complexity across multiple coordinated components.
Solution Approach 2:
The grid pattern structure serves multiple functions simultaneously: it provides touch sensing capability, ensures signal transmission integrity, provides effective grounding through multiple connection points, and maintains flexibility. The vertical and horizontal connections in the grid structure enable the electrode to fulfill multiple electrical functions within a single integrated design.
3Reliability
If the signal lead connects directly to the touch electrode with minimal routing, then the border region becomes smaller, but the grounding effectiveness and signal stability worsen
Solution Approach 1:
The signal lead connection is segmented into multiple connection points with the grid patterns rather than a single direct connection. The vertical connections and horizontal connections create multiple discrete connection segments that distribute the electrical load, improving signal stability and grounding effectiveness while the segmented structure can be compactly arranged within a reduced border region.
Data Source
AI summary
Provided are a display panel, a preparation method thereof, and a display device. The display panel includes a display substrate and a touch panel including multiple touch electrodes, At least one of which includes multiple grid patterns enclosed by metal wires. At least one grid pattern includes a first edge, second edge, third edge and fourth edge that form a ring. The first edge and the third edge extend in a second direction. The second edge and the fourth edge extend in a first direction. A shape of the grid pattern includes a first curved ring, a second curved ring, a third curved ring, or a fourth curved ring. A first edge and third edge of the first curved ring are curves curved towards a direction opposite to the first direction. A first edge and third edge of the second curved ring are curves curved towards the first direction.