OLED Subpixel Filling Parts for Color Separation
Solution Overview
Problem
Existing OLED display panels suffer from color separation issues due to differences in sub-pixel opening sizes and shapes, leading to uneven light emission and luminance.
Innovation Solution
A display substrate with a pixel defining layer featuring sub-pixel openings of the same shape and size, but with varying area ratios of filling parts within each opening, which are correlated with the emitted light wavelengths to ensure consistent light-emitting life across different colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If sub-pixel openings have different sizes and shapes to optimize light emission for different colors, then light emission efficiency is improved, but color separation occurs and display uniformity deteriorates
Solution Approach 1:
The patent introduces filling parts with different area ratios into different sub-pixel openings (red, green, blue) to compensate for their inherently different light emission characteristics. This local modification ensures that despite the different sizes and shapes of sub-pixel openings, the final display uniformity and color accuracy are maintained by adjusting the effective emitting area through the filling parts.
2Illumination intensity
If sub-pixel openings are made larger to increase aperture ratio, then brightness is improved, but color separation worsens
Solution Approach 1:
The patent changes the parameter of filling part area ratio for different sub-pixels. By setting different area ratios (red: 0.5-0.7, green: 0.3-0.5, blue: 0.1-0.3) in the pixel defining layer, it compensates for the different light emission efficiencies of larger sub-pixel openings, thereby maintaining color accuracy while achieving high brightness through large aperture ratio.
3Manufacturing precision
If sub-pixel openings have uniform size and shape, then display uniformity is improved, but light emission efficiency for different colors deteriorates
Solution Approach 1:
The patent applies local quality by introducing filling parts with color-specific area ratios into uniformly sized sub-pixel openings. This allows the openings to maintain uniform geometric dimensions for manufacturing precision while the filling parts provide color-specific optical compensation to optimize light emission efficiency for each sub-pixel type.
4Strength
If aperture ratio is increased for flexibility and thickness reduction, then bending resistance is improved, but color separation worsens
Solution Approach 1:
The patent utilizes parameter changes by adjusting the filling part area ratios according to the specific aperture ratio design. When aperture ratio is increased for flexible display applications, the filling parts provide compensatory adjustment to maintain color accuracy, allowing the display to achieve both high flexibility (through large aperture) and color uniformity (through filling part compensation).
Data Source
AI summary
Disclosed are a display substrate, an organic light-emitting diode display panel and a display device. The display substrate includes a base substrate and a pixel defining layer located on a side of the base substrate, wherein the pixel defining layer is provided with a plurality of sub-pixel openings, outer contour shapes and sizes of all the sub-pixel openings are the same, filling parts are arranged in at least parts of the sub-pixel openings, and for different sub-pixel openings, area ratios of the filling parts to the sub-pixel openings are different.