Array Substrate Multi-Direction Strip Electrodes Luminance Uniformity
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Solution Overview
Problem
In liquid crystal display devices, deviations in the rubbing orientation direction or polarizer adherence lead to uneven luminance between odd and even rows of pixel electrodes, resulting in transverse striations.
Innovation Solution
An array substrate with a 2×2 sub-pixel area matrix, where each sub-pixel area includes three sub-pixel electrodes, with at least one from the first and third areas parallel to a first direction and at least one from the second and fourth areas parallel to a second direction, forming an angle between the directions, ensuring each row has both high and low luminance electrodes, thus eliminating luminance differences between odd and even rows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If strip electrodes from adjacent rows are arranged in a pseudo dual-domain structure with different parallel directions, then the display device achieves broader viewing angles and improved response characteristics, but deviations in rubbing orientation or polarizer adherence cause uneven luminance between odd and even rows, generating transverse striations
Solution Approach 1:
The pixel electrode is divided into multiple strip electrodes arranged in different directions within the same row. Specifically, each pixel electrode includes first strip electrodes extending in a first direction and second strip electrodes extending in a second direction, creating a multi-domain structure at the pixel level. This segmentation allows each pixel to display uniformly regardless of rubbing or polarizer deviations, while the overall array maintains the pseudo dual-domain structure for broad viewing angles.
2Ease of manufacture
If all strip electrodes in a row are parallel to the same direction, then the manufacturing process is simplified and luminance is uniform across the row, but the display device loses the pseudo dual-domain structure benefits and viewing angle performance deteriorates
Solution Approach 1:
Different regions within each pixel electrode are assigned different strip electrode orientations. The first strip electrodes extend in a first direction while second strip electrodes extend in a second direction, creating local directional variations within each pixel. This local quality differentiation maintains manufacturing simplicity through systematic arrangement while achieving the pseudo dual-domain structure benefits for viewing angle performance.
3Reliability
If the rubbing orientation direction deviates during manufacturing or the polarizer is adhered with deviation, then the alignment between electrode directions and optical components is compromised, but with traditional single-direction strip electrodes this causes distinct luminance differences between odd and even rows, the invention's multi-directional arrangement within each pixel compensates for this deviation and maintains luminance uniformity
Solution Approach 1:
The invention changes the directional parameters of strip electrodes within each pixel electrode, arranging them in multiple directions (first direction and second direction) rather than a single direction. This parameter change creates a multi-domain structure that compensates for rubbing or polarizer alignment deviations, making the display more robust to manufacturing variations while maintaining luminance uniformity across all pixel rows.
Data Source
AI summary
An array substrate including a plurality of pixel units each including a 2×2 sub-pixel area matrix, where each of the sub-pixel areas includes three sub-pixel electrodes. The strip electrode of at least one of the sub-pixel electrodes from each of the first sub-pixel area and the third sub-pixel area is parallel to a first direction, and the strip electrode of at least one of the sub-pixel electrodes from each of the second sub-pixel area and the fourth sub-pixel area is parallel to a second direction. The first direction intersects with the second direction. Also, a first area is defined by the sub-pixel electrodes including the strip electrodes parallel to the first direction and the sub-pixel electrodes including the strip electrodes parallel to the second direction, and the first area is provided with a sub-pixel electrode.