Active Device Array Substrate with Raised Patterns for LC Alignment
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Solution Overview
Problem
In multi-domain vertical alignment mode displays, liquid crystal molecules are difficult to fix at the intersections of truck electrodes, leading to unstable reorientation and poor image quality due to asymmetrical branch electrodes and lack of raised patterns to stabilize the electric field.
Innovation Solution
An active device array substrate with asymmetrical branch electrodes and raised patterns between truck electrodes and the substrate, forming distinct domains and electric field structures to stabilize liquid crystal molecule alignment and reorientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If liquid crystal molecules are aligned in various directions to reach multi-domain liquid crystal, then the viewing angle performance is enhanced, but the nodes of liquid crystal molecules are difficult to fix at the intersections of truck electrodes exactly, causing unstable reorientation
Solution Approach 1:
The patent introduces raised patterns at specific locations (intersections of truck electrodes) to create localized electric field enhancements. This local modification allows the bulk of the pixel to maintain multi-domain vertical alignment for wide viewing angles, while the raised patterns provide localized stabilization points that fix the nodes of liquid crystal molecules at the intersections, resolving the contradiction between viewing angle performance and reorientation stability.
Solution Approach 2:
The patent adds a vertical dimension by introducing raised patterns that protrude from the substrate surface. This third dimension (height) creates localized electric field concentrations at the intersections of truck electrodes, providing additional control over liquid crystal molecule orientation. The raised patterns act as electric field anchors that stabilize the nodes without interfering with the overall multi-domain alignment configuration.
2Reliability
If asymmetrical branch electrodes are used to form distinct domains, then the electric field distribution is enhanced, but the structure complexity increases
Solution Approach 1:
The patent employs asymmetrical branch electrodes that extend from the intersections of truck electrodes in non-uniform patterns. These asymmetrical configurations create distinct electric field domains with different orientations, improving the control over liquid crystal molecule alignment. The asymmetry is deliberately designed to generate the required multi-domain structure while maintaining manufacturability through standard photolithography processes.
Solution Approach 2:
The pixel electrode structure is segmented into multiple components: truck electrodes that intersect to form nodes, and branch electrodes that extend from these intersections. This segmentation allows independent optimization of each component's function - the truck electrodes provide the primary alignment structure, while the branch electrodes create the asymmetrical electric field distributions needed for multi-domain operation, thereby managing complexity through functional decomposition.
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
The substrate design effectively stabilizes liquid crystal molecule alignment at intersections, improving image quality by enhancing the electric field distribution and preventing alignment issues, resulting in improved image quality and node stability.
Implementation Method 1
the first raised pattern is disposed at least between the first node and the substrate to form a first raised structure at least at the first node
Data Source
AI summary
An active device array substrate includes a substrate, a first pixel electrode, and a first raised pattern. The first pixel electrode is disposed on or above the substrate, and the first pixel electrode includes a first truck electrode, a second truck electrode, and a plurality of first branch electrodes. The first truck electrode and the second truck electrode intersect to form a first node at the intersection of the first truck electrode and the second truck electrode. The first branch electrodes are connected to the first truck electrode and the second truck electrode to form a plurality of first domains, wherein the first branch electrodes are asymmetrical with respect to the second truck electrode. The first raised pattern is disposed at least between the first node and the substrate to form a first raised structure at least at the first node.