LCD Light-Shielding Layout for Dummy Pixel Leakage Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In liquid crystal display devices with a color filter on the array substrate, misalignment during bonding can lead to degraded display quality due to light leakage from dummy pixels, especially when the second substrate has a surrounding light-shielding layer.
Innovation Solution
The first light-shielding layer is designed with wider apertures and a wider width at the boundary with the display area to shield light from dummy pixels, and applying a common potential to dummy pixel electrodes to ensure they display black, even in cases of misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the color filter is provided on the array substrate, then bonding the array substrate and the opposed substrate together is easier, but misalignment during bonding degrades display quality due to light leakage from dummy pixels
Solution Approach 1:
The light-shielding layer is segmented into multiple regions: a first light-shielding layer on the array substrate with a first aperture pattern, and a second light-shielding layer on the opposed substrate with a second aperture pattern. This segmentation allows each layer to independently compensate for misalignment in different directions, reducing the impact of bonding errors on display quality.
Solution Approach 2:
The light-shielding layers are designed in advance with specific aperture patterns that anticipate potential misalignment during bonding. The first aperture in the first light-shielding layer and the second aperture in the second light-shielding layer are positioned and sized to pre-compensate for expected alignment errors, ensuring that even if misalignment occurs, light leakage from dummy pixels is prevented.
2Object-affected harmful factors
If the first light-shielding layer has a wider width at the boundary with the display area, then light leakage from dummy pixels is suppressed, but the aperture width for pixel display is reduced
Solution Approach 1:
The first light-shielding layer has non-uniform width: it is wider at the boundary with the surrounding area (to suppress light leakage from dummy pixels) and narrower in the central display area (to maintain aperture size for pixel display). This local variation in width optimizes both light shielding performance and display aperture area by placing different structural characteristics in different spatial locations.
Data Source
AI summary
According to one embodiment, a display device includes a first substrate, a second substrate, and a liquid crystal layer. The first substrate includes first pixels overlapping with a display area and second pixels overlapping with a surrounding area, color filters corresponding to each of the first pixels, and a first light-shielding layer including an aperture overlapping with each of the first and second pixels. The second substrate includes a second light-shielding layer surrounding the display area. The width of the first light-shielding layer arranged at a position overlapping with an end portion of the display area is greater than a width between apertures overlapping with each of first pixels adjacent to each other.