Array Substrate Touch Signal Line Overlap Aperture Ratio
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Solution Overview
Problem
The integration of touch signal lines and data lines in liquid crystal display panels often results in a reduced aperture ratio due to the need for wider spacing to avoid short circuits, which compromises display quality.
Innovation Solution
An array substrate design that incorporates a touch electrode layer and touch signal lines within the substrate, where the touch signal lines overlap the opening area of sub-pixels, allowing for reduced non-opening areas and increased aperture ratio without short circuit risks, while also integrating touch functionality for a Full In Cell Touch structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch signal lines are arranged adjacent to data lines with wider spacing to avoid short circuits, then reliability is improved, but aperture ratio deteriorates
Solution Approach 1:
The patent applies dimensionality change by arranging touch signal lines and data lines in different layers (stacked configuration) rather than in the same plane. The touch signal lines are positioned in a touch electrode layer above or below the data lines, allowing their orthographic projections to overlap on the substrate. This vertical separation eliminates the need for lateral spacing while maintaining electrical isolation through insulating layers, thereby resolving the contradiction between avoiding short circuits and maximizing aperture ratio
Solution Approach 2:
The patent implements nesting by placing the touch signal lines within the projection area of the opening areas of sub-pixels, effectively nesting the touch signal line paths within the light-transmitting regions. This allows the touch signal lines to occupy space that would otherwise be wasted, as they are positioned over the opening areas rather than requiring additional lateral space, thus maintaining high aperture ratio while enabling touch functionality
2Area of stationary object
If touch signal lines overlap opening areas of sub-pixels, then aperture ratio is improved, but risk of short circuit increases
Solution Approach 1:
The patent resolves the short circuit risk by transitioning to a three-dimensional stacked architecture where touch signal lines and data lines/pixel electrodes are separated by insulating layers in the vertical dimension. The touch signal lines are formed in a touch electrode layer that is physically separated from the data line layer and pixel electrode layer by insulating films, allowing their projections to overlap on the substrate without creating electrical contact, thus enabling aperture ratio improvement without increasing short circuit risk
Solution Approach 2:
The patent introduces insulating layers as intermediary elements between the touch signal lines and the data lines/pixel electrodes. These insulating films act as mediators that prevent direct electrical contact between conductive elements whose projections overlap on the substrate, thereby allowing the touch signal lines to be positioned over opening areas for maximum aperture ratio while maintaining reliability through electrical isolation
Data Source
AI summary
An array substrate includes a substrate, a gate line on the substrate, a sub-pixel, two data lines, a touch signal line, a functional electrode, and a touch electrode unit. The orthographic projection of the touch signal line on the substrate partially overlaps orthographic projection of an opening area of the sub-pixel on the substrate; the touch electrode unit is coupled to the touch signal line; the extension directions of the first and second sub-function electrode portions of the functional electrode are the same as that of the data line, the first/second sub-functional electrode portion is located on a first/second side of the sub-pixel opening area; along the extending direction of the gate line, a distance between the first/second sub-functional electrode portion and the touch signal line is smaller than a distance between the data line on the first/second side and the touch signal line.