Color Filter Substrate Merging Pixel Electrodes to Suppress Color Mixing
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Solution Overview
Problem
In liquid crystal display devices, misalignment of substrates during the layering process leads to shifted positional relationships between pixel electrodes and color filters, causing color mixing and decreased aperture ratio, especially as higher definition requirements necessitate narrower pixels, exacerbating display quality issues.
Innovation Solution
A color filter substrate design where pixel electrodes and color filters are disposed on the same substrate, with overlapping ends of color filters in specific border areas and crossing points to maintain even thickness and suppress color mixing, while also reducing the need for light-shielding layers along borders, thereby enhancing aperture ratio and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If substrates are misaligned in the layering process, then manufacturing simplicity is maintained, but positional alignment between pixel electrodes and color filters deteriorates, causing color mixing and decreased aperture ratio
Solution Approach 1:
The patent merges the pixel electrodes and color filters onto the same substrate, eliminating the need for precise alignment between separate substrates during layering. This integration resolves the contradiction by maintaining manufacturing simplicity while achieving precise positional alignment, as both elements are now formed on the same substrate plane.
Solution Approach 2:
The patent transitions from a multi-substrate three-dimensional stacking approach to a planar two-dimensional arrangement where pixel electrodes and color filters coexist on the same substrate. This dimensional change eliminates alignment issues between layers while maintaining ease of manufacture.
2Measurement precision
If pixels are made narrower to achieve higher definition, then display resolution is improved, but alignment sensitivity increases and color mixing worsens
Solution Approach 1:
By integrating pixel electrodes and color filters on the same substrate, the patent eliminates alignment sensitivity issues that would otherwise worsen with narrower pixels. The merged structure ensures that even as pixel dimensions decrease for higher definition, the positional relationship between electrodes and filters remains precisely controlled without requiring stringent alignment tolerances.
3Reliability
If light-shielding layers are added along borders to prevent color mixing, then display quality is improved, but aperture ratio decreases
Solution Approach 1:
The patent eliminates the need for additional light-shielding layers by merging pixel electrodes and color filters on the same substrate. This integration inherently prevents color mixing at borders without requiring extra shielding structures, thereby maintaining high aperture ratio while ensuring display quality.
Data Source
AI summary
A color filter substrate includes an insulating substrate, a first pixel electrode, a second pixel electrode, a third pixel electrode, a first color filter disposed between the first pixel electrode and the insulating substrate, a second color filter disposed between the second pixel electrode and the insulating substrate, and a third color filter disposed between the third pixel electrode and the insulating substrate, wherein the first pixel electrode, the second pixel electrode, and the third pixel electrode are adjacent to each other, the first color filter has a first end, the second color filter has a second end, and the third color filter has a third end, and two of the first end, the second end, and the third end overlap in the first overlap area.