Touch Substrate Bridge Routing for Rounded-Corner Signal Isolation
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Solution Overview
Problem
Existing touch substrates face challenges in connecting touch electrodes around notches and rounded corners while maintaining signal integrity and preventing signal interference, which is crucial for narrow bezel or bezel-less designs in touch display devices.
Innovation Solution
The touch substrate employs a bridge-connection design with U-shaped bent portions and shielding lines to connect touch electrodes across notches and rounded corners, ensuring electrical continuity and reducing signal interference by using different layers and insulation layers to isolate connection lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If touch electrodes are extended into rounded-corner regions to increase display area, then screen-to-body ratio is improved, but signal interference between connection lines increases
Solution Approach 1:
The patent transitions from planar routing to three-dimensional layering by arranging the touch-sensing connection line and touch-driving connection line in different layers. This vertical separation in the Z-dimension eliminates signal interference while allowing both lines to occupy the same footprint area, enabling touch electrodes to extend into rounded-corner regions without compromising signal integrity.
Solution Approach 2:
The patent introduces a bridge connection structure as an intermediary element that connects the second rounded-corner touch electrode to the touch-sensing connection line. This bridge structure includes a first bent portion, second bent portion, and first connection portion that overlaps with the touch-driving connection line in different layers, serving as a mediator that enables electrode connection while avoiding direct interference between signal lines.
2Device complexity
If connection lines are routed close to each other to save space, then device complexity is reduced, but signal interference increases
Solution Approach 1:
The patent resolves the contradiction between space efficiency and signal interference by utilizing the vertical dimension through multi-layer routing. The touch-sensing connection line and touch-driving connection line are positioned in different layers, allowing them to be closely spaced in the planar view without causing interference, thus maintaining simple routing while eliminating harmful electromagnetic coupling.
3Area of stationary object
If touch electrodes are connected across notches and rounded corners, then touch coverage is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-defining the bridge connection structure with specific geometric features (bent portions and connection portions) that are designed to overlap with connection lines in different layers. This pre-configured structure simplifies the manufacturing process by providing clear alignment targets and reducing the precision requirements for connecting touch electrodes across notches and rounded corners.
Data Source
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AI summary
A touch substrate and a touch display device are provided. The touch substrate (300) includes a touch region (101), the touch region (101) includes a rounded-corner region (1015), and the touch substrate (300) includes at least one first rounded-corner touch electrode (125) and at least one second rounded-corner touch electrode (135), a touch-driving connection line (145) connected with each first rounded-corner touch electrode (125), and a touch-sensing connection line (350) connected with each second rounded-corner touch electrode (135), the touch-sensing connection line (350) includes a first U-shaped bent portion (352) and a first extension portion (351) extending in a second direction, the first U-shaped bent portion (352) includes a first bent portion (3521), a second bent portion (3522), and a first connection portion (3523), the first bent portion (3521) is electrically connected with the second rounded-corner touch electrode (135) and is located at a side of the touch-driving connection line (145) close to the touch region (101), the second bent portion (3522) is connected with the first extension portion (351) and is located at a side of the touch-driving connection line (145) away from the touch region (101), and the first connection portion (3523) connects the first bent portion (3521) with the second bent portion (3522), the first connection portion (3523) and the touch-driving connection line (145) are arranged in different layers. Therefore, the touch substrate can use a bridge to lead out the second rounded-corner touch electrode.