Array Substrate with Alternating Strip Electrodes for Luminance Uniformity
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Solution Overview
Problem
In liquid crystal display devices, deviations in rubbing orientation or polarizer adherence lead to uneven luminance between odd and even rows of pixel electrodes, causing transverse striations due to inconsistent electric field orientations.
Innovation Solution
An array substrate with a 2×2 sub-pixel area matrix arrangement, where each sub-pixel area includes strip electrodes parallel to specific directions, ensuring that each row of sub-pixel electrodes has both strip electrodes parallel to the first direction and the second direction, which alternates high and low luminance, eliminating distinct luminance differences between odd and even rows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If strip electrodes from adjacent rows are arranged in a pseudo dual-domain structure with different parallel directions, then the display structure achieves domain control, but rubbing orientation deviation or polarizer adherence deviation causes uneven luminance between odd and even rows, generating transverse striations
Solution Approach 1:
The pixel electrode is segmented 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 independently control different domains, preventing the propagation of rubbing or polarizer deviations across entire rows, thereby eliminating transverse striations while maintaining domain control reliability.
2Ease of manufacture
If all strip electrodes in a row are parallel to the same direction, then the electrode structure is simple to manufacture, but any deviation in rubbing orientation or polarizer adherence causes distinct luminance differences between odd and even rows
Solution Approach 1:
Within each pixel electrode, different local regions contain strip electrodes with different 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 approach allows the overall structure to remain simple and manufacturable while introducing sufficient directional diversity at the pixel level to prevent transverse striations, thus resolving the contradiction between manufacturing simplicity and luminance uniformity.
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 switch.