Holed Color Filter for Display Luminance
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Solution Overview
Problem
Display devices, particularly LCDs, face challenges in achieving improved luminance and visibility due to step differences and reduced color reproducibility in white pixel areas without a white color filter, leading to compromised visibility and luminance.
Innovation Solution
Incorporating a fourth color filter with a plurality of holes arranged in a zigzag pattern at the white pixel area, where the holes have equal distances and angles, and are shaped circularly, elliptically, or polygonally, overlapping 25-45% of the pixel electrode area, made of the same material as other color filters, to enhance white light emission and luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a white color filter is used in the white pixel area, then color reproducibility is improved, but step differences occur and luminance is reduced
Solution Approach 1:
The white color filter is segmented into multiple holes arranged in a zigzag pattern, allowing light to pass through while maintaining color accuracy. This segmentation resolves the contradiction by creating multiple small openings that collectively provide both color filtering and sufficient light transmission area.
Solution Approach 2:
The color filter is applied selectively in specific regions (the holes) rather than uniformly across the entire pixel area. This local application allows certain areas to transmit light while others provide color filtering, resolving the contradiction between color reproducibility and luminance.
2Illumination intensity
If the overlap area between holes and pixel electrode is increased, then luminance is improved, but manufacturing precision may be compromised
Solution Approach 1:
The zigzag arrangement of holes creates an asymmetric pattern that optimizes the overlap area with the pixel electrode while maintaining manufacturability. This asymmetric design allows for larger effective overlap area without requiring extremely precise alignment, resolving the contradiction between luminance and manufacturing precision.
Data Source
AI summary
A display device includes a substrate including first, second, third, and fourth pixel areas, first, second, and third color filters at the first, second, and third pixel areas on the substrate, respectively, and a fourth color filter at the fourth pixel area on the substrate, the fourth color filter having a plurality of holes, wherein the plurality of holes includes a first hole, a second hole, and a third hole adjacent to each other, and wherein a first imaginary straight line passing through a center of the first hole and a center of the second hole has an angle in a range from about 20 degrees to about 80 degrees with respect to a second imaginary straight line passing through the center of the first hole and a center of the third hole.