Array Panel Electrode Stacking for Touch Integration and Aperture Ratio
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Solution Overview
Problem
Current liquid crystal display panels face challenges in integrating touch functionality while maintaining high display quality, as the arrangement of touch signal lines and data lines can lead to asymmetrical electric fields and visual defects such as brightness deviations and stains, and the integration of touch electrodes into the array substrate complicates the manufacturing process.
Innovation Solution
The array panel design includes a substrate with a sub-pixel structure where the touch signal line, common electrode, and pixel electrode are stacked in sequence, with the touch signal line overlapping the opening area of the sub-pixel, and the common electrode overlapping the touch signal line and pixel electrode, allowing the common electrode to act as a shield and improve the aperture ratio and reduce manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch signal line is arranged in the non-opening area, then the touch functionality can be integrated, but the aperture ratio decreases due to increased non-opening area
Solution Approach 1:
The touch signal line is arranged in the vertical direction overlapping the opening area, utilizing the third dimension (depth/stacking) to resolve the spatial conflict between touch signal lines and opening areas, thereby maintaining high aperture ratio while enabling touch functionality
Solution Approach 2:
The touch signal line is nested within the opening area's vertical space by stacking it between the common electrode and pixel electrode, allowing the touch signal line to occupy the same planar area as the opening area without reducing the aperture ratio
2Area of stationary object
If the touch signal line overlaps the opening area, then the aperture ratio is improved, but asymmetrical electric fields are generated causing visual defects
Solution Approach 1:
The common electrode serves as an intermediary between the touch signal line and the pixel electrode, providing electrical shielding that blocks the electric field from the touch signal line, thereby preventing asymmetrical electric fields and visual defects while maintaining the touch signal line's position in the opening area
Solution Approach 2:
The common electrode is positioned between the touch signal line and pixel electrode to preemptively counteract the harmful electric field effect before it can reach the pixel electrode, preventing visual defects from occurring
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances the aperture ratio of the liquid crystal display panel by 2-3% and reduces visual defects, while simplifying the manufacturing process by eliminating the need for additional patterning steps and improving the yield by shielding transmittance deviations caused by asymmetrical electric fields.
Implementation Method 1
When the liquid crystal display panel is in operation, a driving electric field is generated between the array substrate and the opposite substrate, the liquid crystal molecules in the liquid crystal layer are deflected under the driving action of the driving electric field
Data Source
AI summary
An 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.