Liquid Crystal Display Panel White Pixel Overlap
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Solution Overview
Problem
The manufacturing process of liquid crystal display panels with white pixels is complex and costly due to the need for photolithography in depositing and patterning materials, increasing processing time and costs.
Innovation Solution
A liquid crystal display panel design where at least two color filters overlap in the transmitting area of white pixels, forming an overlapping portion without additional photomasks or photolithography processes, allowing for simultaneous formation of spacers and filters to maintain cell gaps and improve flatness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photolithography process is used to deposit and pattern white filter material, then white pixels can be formed, but processing time and manufacturing cost increase
Solution Approach 1:
The patent combines the formation of white pixels and spacers into a single simultaneous process. Multiple color filters are deposited and patterned together to create both the white pixel regions and the spacer structures, eliminating the need for separate photolithography steps that would otherwise be required for white filter material deposition and patterning.
Solution Approach 2:
The color filters serve dual functions: they provide the filtering function for color pixels and simultaneously form the spacer structures for white pixels. This multi-functionality allows the same material deposition and patterning process to accomplish both white pixel formation and spacer creation, reducing overall processing time and complexity.
2Manufacturing precision
If photolithography process is used to deposit and pattern white filter material, then white pixels can be formed, but manufacturing cost increases
Solution Approach 1:
The patent merges the deposition and patterning of white filter material with the existing color filter manufacturing process. By using the same photolithography masks and deposition steps to create both color filters and white pixel regions, the patent eliminates additional manufacturing costs associated with separate white filter processing.
Solution Approach 2:
The color filter materials and patterning processes serve multiple purposes: creating color filters for colored pixels and simultaneously forming white pixel regions and spacer structures. This multi-functionality reduces the overall number of manufacturing steps and associated costs.
3Device complexity
If color filters are overlapped to form white pixel transmitting area, then manufacturing process is simplified, but cell gap stability must be maintained
Solution Approach 1:
The patent combines multiple color filters into overlapping layers to form the white pixel transmitting area. This merging approach simplifies the manufacturing process by eliminating the need for separate white filter material deposition, while the overlapping structure inherently maintains cell gap stability through the physical presence of multiple filter layers.
Solution Approach 2:
The patent uses the vertical stacking of multiple color filter layers in the overlapping region to create the white pixel effect. This dimensional approach (stacking layers vertically) maintains the cell gap structure while simplifying the manufacturing process, as the overlapping layers themselves define the white pixel transmitting area without requiring additional materials or processes.
Data Source
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AI summary
Provided is a liquid crystal display panel including white pixels. The liquid crystal display panel includes: a first substrate (210) and a second substrate (100) facing each other; a liquid crystal layer positioned between the first substrate and the second substrate; a plurality of color filters (230) positioned on the first substrate and representing different colors from each other, in which at least two of the plurality of color filters (230_1, 230_2, 230_3) overlap with each other in the transmitting area of the white pixel (PX_W) to form an overlapping portion in white (WOP).