Array Substrate Layout for Higher Aperture and Uniform LCD Brightness
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Solution Overview
Problem
Existing liquid crystal display panels face issues with reduced aperture ratio and visual defects due to asymmetrical electric fields caused by the integration of touch signal lines in non-opening areas, leading to transmittance deviations and brightness inconsistencies.
Innovation Solution
The touch signal lines are arranged in the opening areas of sub-pixels, with a common electrode positioned between them and pixel electrodes to shield transmittance deviations, and a function electrode structure is used to enhance shielding and reduce the black matrix area, while maintaining symmetry and reducing the risk of short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If touch signal lines are placed in non-opening areas, then manufacturing is simplified, but aperture ratio is reduced and visual defects occur
Solution Approach 1:
The touch signal line is moved from the planar non-opening area to a three-dimensional position within the opening area, specifically between the pixel electrode and common electrode. This vertical positioning allows the signal line to occupy space that would otherwise be unused, maintaining manufacturing simplicity while increasing aperture ratio.
Solution Approach 2:
The touch signal line is nested within the sub-pixel structure by positioning it between the pixel electrode and common electrode in the opening area. This nested arrangement allows the signal line to be integrated into the existing pixel structure without requiring additional space, thereby increasing aperture ratio while maintaining manufacturing simplicity.
2Ease of manufacture
If touch signal lines are placed in non-opening areas, then manufacturing is simplified, but transmittance deviation and brightness inconsistency occur
Solution Approach 1:
By moving the touch signal line to a vertical position between the pixel electrode and common electrode within the opening area, the signal line no longer creates asymmetrical electric fields in the plane of the pixel. This three-dimensional positioning ensures uniform light transmittance across the pixel while maintaining manufacturing simplicity.
Solution Approach 2:
The organic insulating layer acts as an intermediary between the touch signal line and the pixel electrode, ensuring proper electrical isolation while allowing the signal line to be positioned within the opening area. This intermediary structure enables the signal line to be placed in a position that maintains both manufacturing simplicity and optical uniformity.
3Area of stationary object
If touch signal lines are placed in opening areas, then aperture ratio is improved, but risk of short circuit increases
Solution Approach 1:
The organic insulating layer serves as a mediator between the touch signal line and the pixel electrode, providing electrical isolation that prevents short circuits. This intermediary layer allows the touch signal line to be positioned within the opening area to maximize aperture ratio while ensuring reliable electrical isolation.
Solution Approach 2:
The structure uses a replicated insulating layer configuration that mirrors the insulation between other pixel components. By applying the same insulating layer thickness and material properties used elsewhere in the pixel structure, the design ensures consistent electrical isolation and prevents short circuits while maintaining the improved aperture ratio.
4Reliability
If thicker organic resin layer is used, then distance between signal line and electrodes is increased, but manufacturing complexity increases
Solution Approach 1:
Instead of increasing the thickness of the organic insulating layer, the design optimizes the vertical positioning of the touch signal line within the existing opening area. By adjusting the vertical position parameter rather than changing material thickness, the design achieves adequate electrical isolation while avoiding the manufacturing complexity associated with thicker resin layers.
Data Source
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AI summary
The present disclosure provides an array panel and a method of manufacturing the array substrate and a display device. The array substrate includes: a substrate; a sub-pixel, wherein the sub-pixel is located on the substrate, and the sub-pixel includes a pixel electrode and a common electrode, an orthographic projection of the pixel electrode on the substrate at least partially overlap an orthographic projection of an opening area of the sub-pixel on the substrate, and an orthographic projection of the common electrode on the substrate at least partially overlaps the orthographic projection of the opening area of the sub-pixel on the substrate; and a touch signal line, wherein the touch signal line is located on the substrate, and an orthographic projection of the touch signal line on the substrate partially overlaps the orthographic projection of the opening area of the sub-pixel on the substrate; the touch signal line, the common electrode and the pixel electrode are stacked in sequence along a direction away from the substrate.