Asymmetric OLED Projections for Flexible Display Color Uniformity
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Solution Overview
Problem
Flexible OLED displays with curved and flat portions suffer from white angle difference (WAD) issues, leading to variations in color quality when viewed from different angles due to differences in light emission characteristics between the curved and flat portions.
Innovation Solution
The display device incorporates a substrate with a curved and flat portion, featuring an insulating layer and organic light emitting diodes (OLEDs) with asymmetric and symmetric projections, along with a wiring layer positioned to reduce light emission angles from the curved portion, enhancing the white angle difference characteristic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible OLED display uses a curved portion connected to the flat portion, then the display can achieve flexible and curved forms, but the white angle difference increases causing color quality variation
Solution Approach 1:
The patent applies local quality by differentiating the projection characteristics between the curved portion and flat portion. The curved portion has an asymmetric projection that compensates for its specific optical properties, while the flat portion maintains a symmetric projection. This localized differentiation resolves the color quality variation issue while preserving overall flexibility.
Solution Approach 2:
The patent introduces asymmetry in the projection configuration of the curved portion. Specifically, the projection in the curved portion is designed to be asymmetric with respect to the light emission direction, which compensates for the white angle difference caused by the curved geometry. This asymmetric design equalizes the color quality between curved and flat portions.
2Device complexity
If the curved portion is located at the edge of the flat portion, then the display maintains a compact structure, but users observe different white characteristics from curved versus flat portions
Solution Approach 1:
The patent applies local quality by differentiating the projection characteristics between the curved portion and flat portion. The curved portion has an asymmetric projection that compensates for its specific optical properties, while the flat portion maintains a symmetric projection. This localized differentiation resolves the color quality variation issue while preserving overall flexibility.
Solution Approach 2:
The patent converts the harmful white angle difference effect in the curved portion into a beneficial compensation mechanism. By designing the projection to be asymmetric in the curved portion, the patent turns the geometric disadvantage into an advantage that actually improves color uniformity when viewed from the front, effectively using the curved geometry's optical characteristics to compensate for its inherent defects.
3Manufacturing precision
If the projection in the curved portion is made asymmetric to compensate for white angle difference, then color quality uniformity improves, but device structure becomes more complex
Solution Approach 1:
The patent applies local quality by differentiating the projection characteristics between the curved portion and flat portion. The curved portion has an asymmetric projection that compensates for its specific optical properties, while the flat portion maintains a symmetric projection. This localized differentiation resolves the color quality variation issue while preserving overall flexibility.
Solution Approach 2:
The patent segments the display into distinct functional regions with different projection characteristics. The curved portion and flat portion are treated as separate segments with tailored projection configurations. This segmentation allows each region to be optimized independently, achieving color uniformity without requiring complete redesign of the entire display structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration improves color quality uniformity across different viewing angles by minimizing the color shift and luminance variations, particularly in high-resolution applications, while maintaining manufacturing efficiency and reducing manufacturing costs.
Implementation Method 1
An organic light emitting diode (OLED) display displays an image by using light that is emitted from a plurality of OLEDs
Data Source
AI summary
A display device includes: a substrate including a curved portion and a flat portion; an insulating layer disposed on the substrate; a first organic light emitting diode disposed on the insulating layer and having a first projection; and a second organic light emitting diode having a second projection, wherein a light emission portion is disposed in the curved portion and the flat portion, the first projection overlaps the light emission portion disposed in the curved portion and is asymmetric in the light emission portion, and the second projection overlaps the light emission portion in the flat portion and is symmetric in the light emission portion.