Touch Signal Line Layering for Narrower Display Peripheral Areas
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Solution Overview
Problem
Existing touch control structures in display technology face challenges in achieving high touch control accuracy and efficient signal line arrangement, particularly in reducing the width of the peripheral area and minimizing defects in the etching process.
Innovation Solution
A touch control structure with a double-layer and single-layer signal line configuration in specific sub-areas, including a touch insulating layer between layers, allows for reduced width and improved spacing of signal lines, reducing the peripheral area and minimizing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a double-layer structure is used for touch signal lines in the peripheral area, then the pitch between signal lines can be reduced and the peripheral area width can be minimized, but the etching process complexity increases and defects may occur
Solution Approach 1:
The peripheral area is divided into multiple sub-areas (first sub-area, second sub-area, third sub-area, fourth sub-area) with different signal line configurations. The first sub-area uses a double-layer structure to minimize width, while other sub-areas use single-layer structures for easier manufacturing. This segmentation allows optimization of each region based on its specific requirements.
Solution Approach 2:
Different regions of the peripheral area are assigned different structural qualities. The first sub-area (where signal lines connect to the integrated circuit) has a greater shortest width and uses a double-layer structure for compactness, while other sub-areas use single-layer structures for manufacturing simplicity. This local differentiation resolves the contradiction between minimizing area and ease of manufacture.
2Area of stationary object
If touch signal lines are arranged with reduced pitch in the peripheral area, then the peripheral area width is minimized, but the risk of manufacturing defects increases
Solution Approach 1:
The peripheral area is segmented into sub-areas with different pitch requirements. The first sub-area has reduced pitch with double-layer structures where space is critical, while other sub-areas maintain larger pitch with single-layer structures to reduce manufacturing defects. This segmentation balances area minimization with reliability.
Solution Approach 2:
Different reliability qualities are assigned to different regions. The first sub-area accepts higher defect risk in exchange for minimized width, while other sub-areas prioritize manufacturing reliability with larger pitch and single-layer structures. This local quality differentiation resolves the contradiction between area and reliability.
3Measurement precision
If a double-layer structure is used for touch signal lines, then touch control accuracy is enhanced through better signal line arrangement, but the device complexity increases
Solution Approach 1:
The touch control structure is segmented into a touch control area with touch electrodes and a peripheral area with signal lines. The peripheral area is further segmented into sub-areas with different layer configurations. This segmentation allows the double-layer structure to be applied only where it benefits touch control accuracy, while reducing complexity in other regions.
Solution Approach 2:
The double-layer structure is applied locally in the first sub-area where signal lines connect to the integrated circuit, providing enhanced touch control accuracy where most needed. Other sub-areas use simpler single-layer structures, reducing overall device complexity while maintaining performance where critical.
4Ease of manufacture
If the first sub-area has a greater shortest width than other sub-areas, then the double-layer and single-layer structures can be effectively transitioned, but the overall area efficiency is reduced
Solution Approach 1:
The peripheral area is segmented into sub-areas with different width characteristics. The first sub-area has a greater shortest width to accommodate the transition between double-layer and single-layer structures, while other sub-areas are optimized for minimal area. This segmentation allows the transition region to have the width it needs without forcing the entire peripheral area to be larger than necessary.
Solution Approach 2:
Different width qualities are assigned to different sub-areas. The first sub-area has increased width locally to facilitate structure transitions, while other sub-areas maintain minimal width for area efficiency. This local quality differentiation resolves the contradiction between manufacturability and area efficiency.
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.