OLED Color-Correction Component With Tuned Angular Weights
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Solution Overview
Problem
Organic light emitting diode (OLED) displays exhibit significant color variation with view direction, particularly in strong cavity designs, leading to undesirable angular color uniformity compared to liquid crystal displays (LCDs).
Innovation Solution
A color-correction component, such as an optical stack with a nanostructured interface or partial reflectors, is integrated with the OLED display panel to reduce color variation with view direction while maintaining or improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a strong cavity design is used in OLED displays to improve light output efficiency, then the axial efficiency is improved, but the angular color uniformity deteriorates due to significant color variation with view direction
Solution Approach 1:
A color-correction component is introduced as an intermediary element between the OLED display panel and the viewer. This component includes optical elements such as waveplates and retarders that actively correct the angular color variation by manipulating the polarization state of light, thereby compensating for the color shift caused by the strong cavity design without reducing axial efficiency
Solution Approach 2:
The patent modifies optical parameters by incorporating waveplates with specific retardance values and orientations, as well as adjusting the cavity thickness and refractive index profiles. These parameter changes enable the system to maintain high axial efficiency while correcting angular color variation through controlled interference and polarization effects
2Stability of the object's composition
If the OLED display panel is designed to reduce white-point color shift, then angular color uniformity is improved, but manufacturing precision requirements increase due to sensitivity to layer thickness variations
Solution Approach 1:
The color-correction component serves as a robust intermediary that compensates for manufacturing variations. By using polarization-based optical elements with well-defined properties, the system achieves color stability without requiring extremely tight control over OLED layer thicknesses, as the correction layer absorbs the sensitivity to dimensional variations
Solution Approach 2:
The design incorporates a tolerance buffer by deliberately designing the color-correction component to compensate for expected manufacturing variations. The optical parameters are chosen such that the system maintains acceptable color performance even when layer thicknesses deviate from nominal values, effectively cushioning against manufacturing imprecision
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 integrated color-correction component enhances angular color uniformity and efficiency, offering improved performance in terms of reduced white-point and blue-point color shifts and increased brightness, while also providing tolerance to manufacturing variations.
Implementation Method 1
A color-correction component, such as an optical stack with a nanostructured interface or partial reflectors, is integrated with the OLED display panel to reduce color variation with view direction
Implementation Method 2
an optical stack with a nanostructured interface
Implementation Method 3
Organic light emitting diode (OLED) displays
Data Source
AI summary
An organic light emitting diode (OLED) display includes a pixelated OLED display panel and a color-correction component disposed on the pixelated OLED display panel. The pixelated OLED display panel has a ratio of blue-to-red color mixing weights at 30 degrees of β030, and a ratio of blue-to-red color mixing weights at 45 degrees of β045, where β045≥β030≥1.05 and 1.5≥β045≥1.1. The color-correction component is configured such that a ratio of blue-to-red color mixing weights at 45 degrees of the display is β45 and a ratio of blue-to-red color mixing weights at 30 degrees of the display is β30, where β045−0.1≥β45≥2.1−β045 and β030−0.05≥β30≥2.05−β030. Methods of making OLED displays are described.