Array Substrate Color Filter Overlap for Liquid Crystal Uniformity
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Solution Overview
Problem
The uneven surface of array substrates in display devices can lead to poor distribution of liquid crystal material, affecting the display quality of LCD devices.
Innovation Solution
The array substrate design includes a substrate with signal lines, first and second color filters, and an overlapping portion where the color filters extend to overlap each other, preventing the liquid crystal material from accumulating unevenly and ensuring an even surface for uniform liquid crystal distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the array substrate has an uneven surface, then the manufacturing process is simpler, but the liquid crystal material distribution becomes uneven causing display quality deterioration
Solution Approach 1:
The color filters are designed to extend beyond the signal lines and overlap with adjacent color filters before liquid crystal material application. This preliminary overlapping structure pre-compensates for potential unevenness, creating a buffer zone that ensures uniform liquid crystal distribution without requiring additional manufacturing steps to flatten the substrate surface.
Solution Approach 2:
The color filters have different extension lengths on different sides of the signal lines. Specifically, the first color filter extends to overlap the signal line while the second color filter extends to overlap part of the signal line, creating asymmetric local structures that collectively achieve overall surface evenness and uniform liquid crystal spacing.
2Manufacturing precision
If the color filters do not overlap, then the manufacturing process is simpler, but the liquid crystal material accumulates unevenly affecting display quality
Solution Approach 1:
The overlapping color filter structure is established in advance during substrate manufacturing, creating a pre-formed even surface template. This preliminary structure guides uniform liquid crystal material distribution without requiring complex real-time adjustments during the liquid crystal application process.
Solution Approach 2:
Adjacent color filters are merged through overlapping regions that extend beyond the signal lines. This merging creates continuous coverage areas that prevent liquid crystal material from accumulating in gaps between color filters, ensuring uniform distribution across the entire substrate surface.
3Area of stationary object
If the overlapping portion overlaps the signal line, then the color filter coverage is more complete, but the liquid crystal margin is reduced causing display quality issues
Solution Approach 1:
The color filters exhibit asymmetric extension patterns relative to the signal lines. The first color filter extends to overlap the signal line while the second color filter extends to overlap part of the signal line, creating differentiated local coverage zones that maintain both complete color filter coverage and adequate liquid crystal margins through strategic non-uniform distribution.
Solution Approach 2:
The overlapping portion is strategically positioned to overlap adjacent color filters rather than the signal lines themselves. This preliminary positioning creates a buffer zone that simultaneously achieves complete color filter coverage and preserves sufficient liquid crystal margin by directing the overlap away from critical signal line regions.
Data Source
AI summary
The array substrate for display device includes: a substrate; a signal line disposed on the substrate; a first color filter disposed on one side of the signal line; a second color filter disposed on the other side of the signal line; and an overlapping portion disposed to overlap part of the first color filter and part of the second color filter. The first color filter extends to overlap the signal line and the overlapping portion is disposed on the other side of the signal line so as not to overlap the signal line.