Touch Sensor Signal Lines Multi-Layer Arrangement
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Solution Overview
Problem
The increasing size of front display areas in modern display devices has led to a reduction in the available space for touch sensor signal lines, making it challenging to efficiently arrange and manage a large number of signal lines while maintaining linear resistance values across different positions.
Innovation Solution
The touch sensor employs a multi-layered structure for its signal lines, with alternating first and second metal layers separated by insulating layers, allowing for efficient arrangement and linear resistance distribution, enabling more signal lines to be accommodated in a smaller area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If signal lines are arranged along the periphery of the front display area, then the touch sensor can function properly, but the available area for signal lines becomes smaller as the front display area increases
Solution Approach 1:
The patent transitions from arranging signal lines in a single plane (2D arrangement along periphery) to utilizing multiple stacked layers (3D arrangement). By placing signal lines on different layers at different heights, the invention effectively increases the available space for signal lines without reducing the front display area, thus resolving the spatial conflict between these two elements.
2Quantity of substance
If more signal lines are arranged in a smaller area, then the touch sensor can support larger displays, but the resistance values of signal lines become non-linear
Solution Approach 1:
The patent applies different structural configurations to different segments of signal lines based on their specific requirements. By allowing signal lines to have varying widths, thicknesses, or material compositions at different locations, the invention can maintain linear resistance characteristics even when packed densely in a small area. This localized optimization enables high signal line density while preserving measurement accuracy.
3Quantity of substance
If signal lines are arranged on multiple layers, then more signal lines can be accommodated, but the device structure becomes more complex
Solution Approach 1:
The patent divides the signal line system into multiple independent layers, with each layer containing a subset of signal lines. This segmentation allows for modular design and manufacturing, where each layer can be processed and optimized independently. The complex functionality of accommodating many signal lines is achieved through this systematic division into manageable segments across multiple layers.
Data Source
AI summary
A touch sensor includes a sensing electrode that receives a touch input disposed on a sensing area of a substrate; and a plurality of sensing lines disposed on a non-sensing area of the substrate. Each of the plurality of sensing lines includes a first area and a second area, and first and second metal layers electrically coupled to the sensing electrode. The second metal layer is disposed on the first metal layer, and an insulating layer is interposed between the first and second metal layers. The sensing lines include first and second sensing lines. The first and second sensing lines include the first and second metal layers in the first area. The first sensing line includes the first metal layer without the second metal layer in the second area, and the second sensing line includes the second metal layer without the first metal layer in the second area.