OLED Color-Correction Layer for Wide-Angle Color Uniformity
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Solution Overview
Problem
Organic light emitting diode (OLED) displays experience significant color shift and efficiency variations when viewed from different angles due to their strong cavity design, which is particularly problematic in active-matrix OLEDs, leading to inferior angular color uniformity compared to liquid crystal displays.
Innovation Solution
Incorporating a hybrid color correction component with a nanostructured interface and an angular transformation layer between the OLED stack and the nanostructured interface, which redirects light to improve angular brightness and color distribution, thereby reducing color shift and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a strong cavity design is used in OLED displays, then the OLED structure is simplified and manufacturing is easier, but color shift and efficiency variations occur when viewed from different angles
Solution Approach 1:
The patent introduces an angular transformation layer as an intermediary component between the OLED stack and the external environment. This layer transforms the angular distribution of light without requiring changes to the OLED cavity structure itself, thereby maintaining manufacturing simplicity while achieving improved angular color uniformity
Solution Approach 2:
The patent modifies the angular distribution parameter of light emission by introducing the angular transformation layer. This layer changes the propagation angles of emitted light, effectively compensating for the color shift that occurs in strong cavity OLED designs when viewed from different angles
2Device complexity
If conventional OLED displays are used without color correction components, then device complexity is reduced, but significant color shift occurs as view angle varies
Solution Approach 1:
The hybrid color correction component acts as an intermediary element that addresses color shift without requiring fundamental changes to the OLED structure. By adding this relatively simple component, the system achieves significantly reduced white-point color shift (WPCS45 < 0.005) while maintaining reasonable device complexity
Solution Approach 2:
The patent employs a hybrid color correction component that combines multiple materials and structures (angular transformation layer and nanostructured interface) to achieve superior color uniformity. This composite approach allows for precise control of light properties while keeping the overall device complexity manageable
3Use of energy by moving object
If the OLED display is designed for high brightness efficiency, then on-axis performance is improved, but angular color uniformity deteriorates
Solution Approach 1:
The angular transformation layer serves as a mediator that preserves the high on-axis brightness efficiency of the OLED while correcting the angular color distribution. It transforms off-axis light propagation without affecting the on-axis emission, thereby maintaining energy efficiency while improving angular color uniformity
Solution Approach 2:
The patent applies local quality modification by using the angular transformation layer to specifically address off-axis light emission characteristics. The layer leaves on-axis emission unchanged (preserving brightness efficiency) while locally modifying the angular distribution of off-axis light to achieve uniform color across viewing angles
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
The hybrid color correction component significantly reduces color shift and increases efficiency by optimizing the angular distribution of light, resulting in improved color uniformity and brightness across various viewing angles, outperforming conventional OLED displays in terms of white-point and subpixel axial efficiency.
Implementation Method 1
an angular transformation layer between the OLED stack and the nanostructured interface, which redirects light to improve angular brightness and color distribution
Implementation Method 2
The hybrid color-correction component can include a nanostructured interface and an angular transformation layer... optimizing the angular distribution of light
Data Source
AI summary
An organic light emitting diode (OLED) display is described, and includes a pixelated OLED display panel including N a plurality of pixels, each pixel including a plurality of subpixels, and each subpixel including a plurality of OLED layers. A hybrid color correction component is disposed on the pixelated OLED display panel, and the hybrid color-correction component includes a nanostructured interface and an angular transformation layer, the angular transformation layer is disposed between the nanostructured interface and the pixelated OLED display panel.