Black Matrix Color Filter Layout for Micro OLED Color Isolation
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Solution Overview
Problem
Micro OLED displays in head-mounted displays and electronic viewfinders face issues with color mixing due to finer pixel sizes, leading to reduced color saturation and uneven viewing angle characteristics, especially when viewed from directions other than the front.
Innovation Solution
A display device design featuring a color filter layer with colored portions and a black matrix where the black matrix's top surface is higher than the color filter layer's top surface, and optionally includes a lens layer with lenses facing the colored portions, preventing light from one subpixel from entering adjacent subpixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel size is reduced to obtain higher resolutions, then the resolution is improved, but color mixing occurs and color saturation is reduced
Solution Approach 1:
The invention introduces a black matrix that segments the display area into distinct subpixel regions. The black matrix includes partition portions positioned between adjacent colored portions (red, green, blue subpixels) to physically separate and isolate light emission from each subpixel, preventing color mixing while maintaining high resolution
Solution Approach 2:
The black matrix is strategically positioned only where needed - between adjacent colored portions - rather than uniformly across the entire display. This localized approach prevents color mixing at critical boundaries while preserving light transmission efficiency in the colored subpixel regions
2Measurement precision
If the pixel size is reduced to obtain higher resolutions, then the resolution is improved, but viewing angle characteristics deteriorate
Solution Approach 1:
The black matrix partitions the display into isolated subpixel regions, preventing light from one subpixel from leaking into adjacent subpixels. This segmentation ensures that each color (red, green, blue) maintains its intended characteristics from all viewing angles, eliminating the uneven color saturation that normally occurs when viewed from directions shifted from the front
Solution Approach 2:
The black matrix acts as an intermediary barrier between adjacent colored portions. It blocks and absorbs stray light that would otherwise travel between subpixels at oblique angles, ensuring consistent color saturation and viewing angle characteristics across the entire display
3Object-generated harmful factors
If a black matrix is added to prevent color mixing, then color saturation is improved, but device complexity increases
Solution Approach 1:
The invention combines the black matrix formation with the existing color filter layer manufacturing process. The black matrix and colored portions are formed in an integrated structure, where the black matrix serves both as a structural element and as an optical isolation barrier, eliminating the need for separate manufacturing steps
Solution Approach 2:
The black matrix performs multiple functions simultaneously: it provides structural support, defines subpixel boundaries, prevents color mixing, and maintains viewing angle characteristics. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity
Data Source
AI summary
A display device and method of manufacture of a display device having good viewing angle characteristics. The device includes a substrate, a plurality of light-emitting elements that are provided on the substrate, a color filter layer that is provided on the plurality of light-emitting elements and includes a plurality of colored portions facing the respective plurality of light-emitting elements, and a black matrix that includes a plurality of partition portions each of which is sandwiched between adjacent ones of the plurality of colored portions. A height of a top surface of the black matrix is equal to or greater than a height of a top surface of the color filter layer.