Display Substrate Touch Routing Around Blocking Dam for Narrow Bezel
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Solution Overview
Problem
The existing design of touch signal lines in flexible multi-layer on cell (FMLOC) technology limits the ability to narrow the bezel width due to the arrangement of routing wires between the blocking dam and the display region, hindering the development of thinner display screens.
Innovation Solution
The display substrate design includes touch signal lines with first and second routing wires arranged on inner and outer sides of the blocking dam, utilizing the space on both sides of the dam to reduce the frame region width, and incorporates a double-layer routing wire structure to prevent touch failure and reduce resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch signal lines are arranged between the blocking dam and the display region, then the touch function can be integrated, but the bezel width cannot be narrowed
Solution Approach 1:
The patent transitions from a single-plane routing arrangement to a three-dimensional multi-layer structure. Touch signal lines are distributed across multiple layers (first touch signal line layer, second touch signal line layer, third touch signal line layer) with vertical stacking, allowing signals to route above and below the blocking dam simultaneously. This dimensional expansion resolves the contradiction by providing sufficient routing capacity without increasing horizontal bezel width.
Solution Approach 2:
The patent implements nested routing where touch signal lines are organized in concentric patterns around the blocking dam. Inner routing wires are positioned closer to the display region while outer routing wires are positioned farther away, creating a nested arrangement that efficiently utilizes the annular space between the blocking dam and the display region boundaries, thereby narrowing the bezel width while maintaining touch functionality.
2Device complexity
If routing wires are arranged in a single layer between blocking dam and display region, then the structure is simple, but the bezel width is increased
Solution Approach 1:
The patent adds vertical dimension to the routing structure by implementing multiple layers stacked in the thickness direction. The first touch signal line layer, second touch signal line layer, and third touch signal line layer are positioned at different heights, creating a multi-level routing architecture that reduces horizontal space requirements and narrows the bezel width while maintaining structural organization.
Solution Approach 2:
The routing structure is segmented into multiple functional layers with distinct purposes. The first layer handles primary signal routing, the second layer provides additional routing capacity, and the third layer offers further signal paths. This segmentation allows complex routing requirements to be met while distributing the complexity across multiple manageable layers rather than concentrating it in a single plane.
3Length of moving object
If routing wires are placed close to the blocking dam, then the bezel width is reduced, but the risk of touch failure increases
Solution Approach 1:
The patent uses vertical layering to separate routing wires from the blocking dam horizontally. By positioning routing wires in multiple layers at different heights, the design achieves close proximity to the blocking dam for space efficiency while maintaining adequate physical separation through the vertical dimension, thereby reducing touch failure risk while narrowing the bezel width.
Solution Approach 2:
The patent applies different spatial arrangements to different routing wires based on their specific signal requirements. Some routing wires are positioned closer to the blocking dam in certain layers, while others are positioned farther away in different layers. This localized optimization allows the bezel width to be narrowed in critical areas while maintaining reliability in areas where touch signal transmission is more sensitive to interference.
4Reliability
If more routing wires are added to reduce resistance, then the signal transmission efficiency improves, but the space requirement increases
Solution Approach 1:
The patent resolves the space conflict by routing additional wires in the vertical dimension through multiple layers. The first, second, and third touch signal line layers are stacked to provide multiple parallel signal paths without significantly increasing the horizontal footprint. This allows resistance to be reduced by adding more routing wires while maintaining a compact frame region area.
Solution Approach 2:
The patent arranges routing wires in nested concentric patterns where inner wires are positioned closer to the blocking dam and outer wires are positioned farther away. This nested configuration maximizes the utilization of the annular space, allowing multiple wires to be packed efficiently in a compact area, thereby reducing resistance while minimizing the frame region space requirement.
Data Source
AI summary
Disclosed are a display substrate and a display device. The display substrate includes a base substrate which includes a display region and a frame region surrounding the display region; at least one circle of blocking dam arranged around the display region in the frame region; and a touch metal layer located on the side, away from the base substrate, of the layer where the blocking dam is located; the touch metal layer includes a plurality of touch electrodes and a plurality of touch signal lines electrically connected to the plurality of touch electrodes, wherein the plurality of touch electrodes are at least partially located in the display region, and the plurality of touch signal lines are located in the frame region; the plurality of touch signal lines include: a plurality of first wirings and a plurality of second wirings arranged in parallel in a first direction.