Display Color-Filter Layout to Reduce Peripheral Step Defects
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Solution Overview
Problem
Display devices face issues with defects due to steps generated in regions where multiple color filters are laminated, affecting light emission efficiency and color purity.
Innovation Solution
A display device design featuring a base layer with pixel regions and a peripheral region, utilizing a color filter layer with specific overlapping and spaced-apart patterns to minimize the thickness of steps, including single-layered and multi-layered regions to enhance reliability and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple color filters are laminated in the peripheral region, then color purity is improved, but step thickness increases causing defects
Solution Approach 1:
The peripheral region is segmented into a first peripheral region and a second peripheral region. The first color filter overlaps the first pixel region and the first peripheral region, while the second color filter overlaps the second pixel region and the second peripheral region. This segmentation allows different color filter arrangements in different peripheral regions, reducing step thickness in critical areas while maintaining color purity where needed.
Solution Approach 2:
Different regions of the color filter layer are given different structures: single-layered regions in areas where step thickness would be problematic, and multi-layered regions where color purity is prioritized. This local differentiation resolves the contradiction by optimizing each region's structure according to its specific functional requirements.
2Illumination intensity
If color filters are laminated to improve light emission efficiency, then display quality improves, but steps are generated affecting reliability
Solution Approach 1:
The color filter layer is divided into single-layered regions and multi-layered regions. Single-layered regions are positioned to reduce step thickness and prevent defects, while multi-layered regions maintain color purity and light emission efficiency. This segmentation allows the system to achieve both high light emission efficiency and reliability simultaneously.
Solution Approach 2:
Different regions of the color filter layer are optimized for different functions: some regions use multiple laminated color filters to maximize light emission efficiency and color purity, while other regions use single-layered structures to minimize step thickness and eliminate defects. This local optimization resolves the contradiction between light emission efficiency and reliability.
Data Source
AI summary
A display device including a base layer including first to third pixel regions and a peripheral region, light emission elements, and a color filter layer. The color filter layer includes a first color filter overlapping the first pixel region and the peripheral region, and including first and second openings, a second color filter overlapping the second pixel region and the peripheral region, and including third and fourth openings, and a third color filter overlapping the third pixel region and the peripheral region, and including fifth and sixth openings. The peripheral region includes a single-layered region not overlapped by the first and second color filters and overlapped by the third color filter and a multi-layered region overlapped by at least two of the first and third color filters. The single-layered region is disposed on an outer side of each of the first to fourth openings in a plan view.