Double-Layer Touch Signal Line Layout for Narrow Display Corners
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Solution Overview
Problem
Existing touch control structures in display technology face challenges in achieving high touch control accuracy and minimizing the width of the peripheral area while avoiding defects such as shorts and etching issues.
Innovation Solution
A touch control structure with a double-layer region and a single-layer region in specific sub-areas of the peripheral area, where adjacent structures are alternately disposed in different layers, connected by vias through an insulating layer, reducing the width and pitch of signal lines, and optimizing the layout to minimize defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-layer structure is used for touch signal lines in the peripheral area, then the manufacturing process is simpler, but the peripheral area width cannot be minimized effectively
Solution Approach 1:
The patent transitions from a single-layer to a double-layer structure for touch signal lines in the peripheral area, utilizing the vertical dimension to stack conductive layers. This allows signal lines to be routed in different layers, reducing the horizontal space required and minimizing the peripheral area width while maintaining manufacturing feasibility through standard multi-layer deposition processes.
Solution Approach 2:
The peripheral area is segmented into different regions (first sub-area with double-layer structure, second sub-area with single-layer structure) based on functional requirements. This segmentation allows optimization of each region independently, using double-layer structures where space is constrained and single-layer structures where manufacturing simplicity is prioritized.
2Area of stationary object
If the peripheral area width is reduced, then the display area increases, but touch signal lines may suffer from shorts and etching defects
Solution Approach 1:
By routing touch signal lines through multiple layers vertically stacked, the patent reduces the horizontal pitch between adjacent signal lines while maintaining sufficient separation distance. This vertical arrangement prevents shorts and etching defects that would occur in single-layer dense routing, ensuring reliability even when the peripheral area is minimized.
Solution Approach 2:
The patent introduces an insulating layer between the first and second conductive layers, serving as an intermediary that electrically isolates adjacent signal lines. This insulating barrier prevents shorts and etching defects while allowing the signal lines to be positioned close together, maximizing the display area without compromising reliability.
3Length of stationary object
If a double-layer structure is used for touch signal lines, then the peripheral area width is minimized, but the device complexity increases
Solution Approach 1:
The patent applies the double-layer structure locally only in the first sub-area where space optimization is critical, while using single-layer structures in the second sub-area. This localized approach minimizes the peripheral area width where needed without unnecessarily increasing device complexity across the entire structure.
Solution Approach 2:
The patent merges the double-layer and single-layer regions through transition structures that connect the different layer configurations. This integration allows the complex double-layer structure to be combined with simpler single-layer areas, reducing overall device complexity while maintaining the space-saving benefits in critical regions.
4Productivity
If the pitch of signal lines is reduced, then more signal lines can be accommodated, but manufacturing precision requirements increase
Solution Approach 1:
The patent reduces signal line pitch by utilizing the vertical dimension with stacked conductive layers. This allows higher signal line density to be achieved without proportionally increasing manufacturing precision requirements, as the vertical separation provides inherent protection against fabrication variations that would affect horizontal routing.
Solution Approach 2:
The insulating layer acts as a mediator that maintains precise spacing between adjacent signal lines in different layers. This intermediary structure simplifies the manufacturing process by providing a robust spacer that is easier to control than direct horizontal spacing, thereby reducing the effective precision requirements for achieving high signal line density.
Data Source
AI summary
A touch control structure includes a plurality of touch signal lines in a peripheral area. A respective touch signal line includes a double-layer structure in a double-layer region and a single-layer structure in a single-layer region. The peripheral area includes a first sub-area on a first side, a second sub-area on a second side, a third sub-area on a third side, a fourth sub-area on a fourth side, of the touch control area. The first sub-area includes a side region, and one or more corner regions. The double-layer region and the single-layer region are in the first sub-area, the first sub-area has a first shortest width along a direction from the touch control area to the first sub-area, the first shortest width is greater than a shortest width of at least one of sub-areas of the peripheral area other than the first sub-area.