Curved LCD Pixel Electrode Slit Alignment
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Solution Overview
Problem
Conventional liquid crystal display (LCD) devices with curved substrates face challenges in maintaining alignment and preventing misalignment between the display and opposing substrates, leading to potential defects and light transmittance issues, especially when the substrates are curved along a specific direction.
Innovation Solution
The design incorporates a pixel electrode with specific stem and branch portions arranged in intersecting directions, including slits that are angled relative to the substrate's curvature, and a shielding electrode to prevent misalignment and light blocking, ensuring proper liquid crystal alignment and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the substrates are curved along a specific direction to provide stereoscopic sense and immersion, then the display quality and user experience are improved, but alignment defects and misalignment between display and opposing substrates occur leading to light transmittance issues
Solution Approach 1:
The pixel electrode is divided into multiple unit electrodes (first unit electrode, second unit electrode, third unit electrode, fourth unit electrode) with slits between them. This segmentation allows each unit electrode to be independently positioned and aligned, reducing the impact of substrate curvature on overall alignment. The slits act as reference markers that facilitate precise alignment between the display substrate and opposing substrate during the curving process.
Solution Approach 2:
The slits in the pixel electrode serve as intermediary alignment markers. These slits provide visual or detectable references that mediate the alignment process between the curved display substrate and the opposing substrate. By using these intermediary markers, the alignment precision is maintained even when the substrates are curved, preventing misalignment defects.
2Ease of manufacture
If the pixel electrode uses a conventional design without slits, then the manufacturing process is simpler, but alignment defects occur and light transmittance is degraded
Solution Approach 1:
The pixel electrode is segmented into unit electrodes with slits, which not only improves alignment but also enhances light transmittance. The slits allow light to pass through more efficiently by reducing the total electrode area that blocks light, while still maintaining the necessary electrical functionality through the connectors between unit electrodes.
Solution Approach 2:
The slits are strategically positioned in specific locations of the pixel electrode where they provide both alignment reference functionality and light transmittance enhancement. This local modification optimizes both alignment precision and light transmission without requiring complete redesign of the entire electrode structure.
3Ease of operation
If the slits are parallel to the curvature direction, then the alignment process is simpler, but alignment defects still occur and manufacturing precision is reduced
Solution Approach 1:
The slits are designed with asymmetric positioning and orientations relative to the curvature direction. This asymmetric design creates unique alignment patterns that are more sensitive to misalignment, allowing for higher precision alignment even though the operation becomes slightly more complex. The asymmetric slit configuration provides better reference characteristics for detecting and correcting alignment errors.
Data Source
AI summary
A display substrate includes a base substrate including pixel areas in a first direction and a pixel electrode. The pixel electrode includes a sub-pixel electrode including first and second unit electrodes connected by a first connector, and a first slit non-parallel to the first direction between the first and second unit electrodes. The first unit electrode includes a first vertical stem portion at a side of the pixel area, and a first horizontal stem portion including an end connected to the first vertical stem portion and an end adjacent to a first vertical stem portion of an adjacent pixel electrode. The second unit electrode includes a second vertical stem portion at another side of the pixel area, and a second horizontal stem portion including an end connected to the second vertical stem portion and another end adjacent to a second vertical stem portion of another adjacent pixel electrode.