Array Substrate Layout for Higher In-Cell Touch Aperture
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Solution Overview
Problem
The conventional in-cell touch screens suffer from a low pixel aperture ratio due to the arrangement of touch signal lines and data lines, which limits display quality.
Innovation Solution
The touch signal lines and data lines are arranged in different layers and insulated from each other, with their projections partially overlapping, allowing for reduced spacing requirements and minimizing the non-aperture region, thereby improving the pixel aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If touch signal lines and data lines are arranged in the same layer, then manufacturing process is simpler, but pixel aperture ratio decreases due to increased spacing requirements
Solution Approach 1:
The patent applies dimensionality change by transitioning from a two-dimensional planar arrangement to a three-dimensional stacked arrangement. Touch signal lines and data lines are positioned in different layers (different z-dimensions) rather than the same layer, allowing their projections to overlap in the xy-plane. This vertical stacking enables the lines to occupy the same footprint area without physical interference, eliminating the need for lateral spacing and thereby maximizing the pixel aperture ratio while maintaining manufacturing feasibility through standard multi-layer thin-film fabrication processes.
2Area of moving object
If touch signal lines and data lines are placed closer together, then pixel aperture ratio improves, but shielding requirements increase leading to additional manufacturing complexity
Solution Approach 1:
The patent eliminates the need for additional shielding structures by utilizing the third dimension for spatial separation. By positioning touch signal lines and data lines in different layers, the inherent vertical distance provides natural electrical isolation, replacing the need for lateral shielding structures. This approach maintains signal integrity while maximizing aperture ratio without introducing additional manufacturing complexity.
Solution Approach 2:
The patent introduces insulating layers as intermediary elements between the touch signal lines and data lines in different layers. These insulating layers serve as mediators that provide electrical isolation and prevent signal interference, enabling the lines to be placed in close horizontal proximity without requiring complex active shielding structures. The insulating layers are integrated into the existing multi-layer fabrication process.
3Reliability
If spacing between touch signal lines and data lines is increased, then signal interference is reduced, but pixel aperture ratio decreases
Solution Approach 1:
The patent resolves the signal interference issue by exploiting the vertical dimension. Touch signal lines and data lines are separated in the z-direction (different layers) rather than the xy-plane, allowing their projections to overlap completely or partially. This vertical separation provides sufficient electrical isolation to prevent signal interference while enabling maximum horizontal packing density, thereby maximizing the pixel aperture ratio without compromising signal integrity.
Solution Approach 2:
The patent employs insulating layers as intermediary barriers between touch signal lines and data lines in adjacent layers. These insulating layers provide dielectric isolation that prevents capacitive coupling and signal interference, enabling the lines to be positioned in close horizontal proximity. The insulating layers are seamlessly integrated into the multi-layer thin-film fabrication process, adding no significant manufacturing complexity.
Data Source
AI summary
An array substrate including: a base substrate; a data line on the base substrate and extending in a first direction; and a touch signal line on the base substrate, wherein an extending direction of the touch signal line is the same as an extending direction of the data line; an orthographic projection of the touch signal line on the base substrate at least partially overlaps an orthographic projection of the data line on the base substrate, which is within an orthographic projection of a gap between two touch electrode units adjacent in a second direction on the base substrate, and a size of the data line in the second direction is smaller than a size, in the second direction, of the gap between the two touch electrode units adjacent in the second direction, where the second direction is perpendicular to the first direction.