LCD Color Filter Columns for Lateral Visibility
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Solution Overview
Problem
Liquid crystal display (LCD) panels face challenges in improving lateral visibility due to step differences between color filters, which can cause a yellowish phenomenon when viewed from the side, affecting image color accuracy.
Innovation Solution
Incorporating columns protruding from the substrates into the color filters, particularly the white light filter, to reduce step differences and enhance color uniformity, allowing for improved visibility and color accuracy by matching the height and material of the columns with adjacent color filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If color filters are formed with different heights to accommodate different materials, then manufacturing flexibility is improved, but step differences between color filters increase causing yellowish phenomenon and reduced lateral visibility
Solution Approach 1:
The patent introduces columns protruding from the substrate surface to create a vertical dimension solution. By adding height through columns rather than varying color filter heights, the patent resolves the step difference problem while maintaining manufacturing flexibility. The columns provide the necessary height adjustment without creating harmful step differences between color filters.
Solution Approach 2:
The patent applies different structures to different regions: columns are added only to specific color filters (e.g., red, green, blue) that require height adjustment, while the white light filter remains flat. This localized application allows manufacturing flexibility for different materials while preventing yellowish phenomenon only where necessary.
2Adaptability or versatility
If color filters are formed with different heights, then material selection freedom is improved, but lateral visibility deteriorates due to step differences
Solution Approach 1:
The patent moves the height adjustment function from the color filter layer to a separate column structure protruding from the substrate. This dimensional separation allows color filters to be formed at uniform heights (improving lateral visibility) while still accommodating different materials with varying thicknesses through the column height.
Solution Approach 2:
The columns act as intermediary structures between the substrate and the color filters. They provide the necessary height adjustment and support for different color filter materials without directly increasing the color filter heights themselves, thus maintaining good lateral visibility while enabling material selection freedom.
3Ease of operation
If columns are added to color filters to reduce step differences, then lateral visibility is improved, but device complexity increases
Solution Approach 1:
The patent merges the column formation process with the existing color filter manufacturing process. The columns are formed using similar deposition and patterning techniques already employed for color filters, thereby reducing overall device complexity despite the additional structural element.
Solution Approach 2:
The patent uses the same material for both the columns and the color filters (e.g., organic electroluminescent materials). This material homogeneity simplifies the manufacturing process and reduces device complexity by eliminating the need for separate material deposition processes.
4Stability of the object's composition
If columns protruding from substrates are incorporated into color filters, then color uniformity is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent forms the columns before depositing the color filter materials. This preliminary action allows the color filter materials to be deposited uniformly across the surface without having to accommodate varying substrate heights, thereby improving color uniformity while managing manufacturing complexity through process sequencing.
Solution Approach 2:
By using the same material for columns and color filters, the patent achieves both color uniformity (through consistent material properties) and simplified manufacturing (through reduced process complexity). The homogeneous material approach eliminates the need for separate material handling and deposition processes.
Data Source
AI summary
A liquid crystal display panel includes a first substrate and a second substrate facing each other, a liquid crystal layer disposed between the first substrate and the second substrate, and color filters disposed on the first substrate, each color filters respectively configured to transmit light of one of first through fourth colors, in which at least one of the color filters includes at least one column protruding from the first substrate.