LCD Pixel Protrusions for Inkjet Color Filter Planarization
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Solution Overview
Problem
Liquid crystal displays (LCDs) face issues with color reproducibility due to light leakage caused by uneven thickness of color filters formed using the inkjet method, leading to differences in color between the edge and center of pixels, which reduces aperture ratio and overall display quality.
Innovation Solution
The implementation of protrusion members on the substrate within the pixel, made of the same material as the partition, restricts the movement of color filter ink during the inkjet process, ensuring even thickness and planarization across the pixel, preventing light leakage and enhancing color reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the color filter is formed using the inkjet method, then the manufacturing process is simplified and a light exposer is not used, but the thickness of the color filter becomes different between the edge and the center of the pixel, causing light leakage and decreasing color reproducibility
Solution Approach 1:
The protrusion members are formed in advance on the substrate before the color filter ink is deposited. These protrusions create physical barriers that guide and restrict the flow of the inkjet-deposited color filter material, ensuring uniform thickness distribution across the pixel area before subsequent processing steps occur.
Solution Approach 2:
The protrusion members are strategically positioned at specific locations within the pixel (such as at the corners or along the edges) to provide localized control over ink flow. This creates different structural characteristics in different regions of the pixel, with protrusions placed where they are most needed to prevent ink accumulation or uneven distribution.
2Reliability
If the area of the light blocking member is increased to provide a misalignment margin, then alignment tolerance is improved, but the size of the openings is decreased, reducing the aperture ratio of the pixels
Solution Approach 1:
The invention changes the structural parameters of the pixel by adding protrusion members that modify the effective optical path and light distribution. This allows for optimization of the opening size and light blocking member area parameters to achieve both good alignment tolerance and maintained aperture ratio through improved light utilization rather than simply increasing physical dimensions.
Data Source
AI summary
A liquid crystal display according to an exemplary embodiment of the present invention includes: a substrate; a partition formed on the substrate and defining a pixel; a plurality of protrusion members formed with the same material as the partition on the substrate, and disposed with a linear plane shape inside the pixel defined by the partition; and a color filter filled inside the pixel defined by the partition. Accordingly, in the liquid crystal display according to an exemplary embodiment of the present invention, a plurality of transparent protrusion members are formed in the pixel defined by the partition such that movement of color filter ink dripped through an Inkjet method is controlled such that a color filter may be planarized on the whole surface of the pixel.