LCD Light-Shielding Pattern Stepped Portions for Misalignment
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Solution Overview
Problem
In liquid crystal display (LCD) devices employing a black matrix-on-array substrate and black column spacers, misalignment between the light-shielding pattern and dummy color layer can occur due to different stitch shots used for their formation, leading to visible reflected light or smudges.
Innovation Solution
Incorporating stepped portions on the light-shielding pattern and strategically overlapping dummy color layers with these stepped portions to ensure proper alignment and prevent light reflection or smudges, even if the open portions and dummy color layers are misaligned.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the light-shielding pattern and dummy color layer are formed by different stitch shots, then the formation process is flexible and efficient, but misalignment occurs between the open portion of the light-shielding pattern and the dummy color layer
Solution Approach 1:
A dummy light-shielding pattern is introduced as an intermediary element formed by the same stitch shot as the dummy color layer. This dummy pattern acts as a reference marker that aligns with the actual light-shielding pattern, enabling precise positioning of the dummy color layer without requiring direct alignment between the two differently-formed structures
Solution Approach 2:
The dummy light-shielding pattern is formed in advance during the same stitching process as the dummy color layer. This preliminary formation establishes a reference framework that guides subsequent alignment operations, ensuring that the dummy color layer will be correctly positioned relative to the actual light-shielding pattern even though they are formed by different processes
2Reliability
If the dummy color layer is positioned to overlap the open portion, then contact between conductive balls and common electrode is ensured, but misalignment causes metal exposure leading to reflected light visibility
Solution Approach 1:
The dummy light-shielding pattern serves as a mediator that transfers the alignment information from the dummy color layer to the actual light-shielding pattern. By aligning the dummy color layer with the dummy light-shielding pattern (which were formed together), the system ensures both the open portion coverage and prevention of metal exposure without direct alignment between the differently-formed elements
3Object-affected harmful factors
If the dummy color layer and light-shielding pattern are perfectly aligned, then no reflected light or smudges are visible, but the formation process becomes complex and time-consuming
Solution Approach 1:
The alignment system is segmented into two independent but related components: the dummy light-shielding pattern formed with the dummy color layer, and the actual light-shielding pattern formed separately. This segmentation allows each component to be optimized for its specific formation process while maintaining overall alignment through the reference relationship between them
Solution Approach 2:
The dummy light-shielding pattern is essentially a copy or replica of the actual light-shielding pattern's structural characteristics, formed simultaneously with the dummy color layer. This copying approach allows the system to use the easily-formed dummy pattern as a template for achieving precise alignment in the final structure without replicating the complexity of direct alignment between differently-formed elements
Data Source
AI summary
A liquid crystal display device includes: a first substrate; a second substrate disposed opposite to the first substrate, where a display area and a non-display area are defined in each of the first and second substrates; a liquid crystal layer disposed between the first substrate and the second substrate; a common voltage line disposed in the non-display area of the first substrate; a light-shielding pattern disposed on the common voltage line and including an open portion, which at least partially exposes the common voltage line; and a dummy color layer disposed below the common voltage line and at least partially overlapping the open portion. The light-shielding pattern includes a first stepped portion disposed on a side of the open portion and a second stepped portion disposed on another side of the open portion, and the dummy color layer overlaps at least one of the first and second stepped portions.