RGB OLED Optical Modulation for Color-Shift Control
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Solution Overview
Problem
Display devices using multiple image display panels with differing lifetime characteristics due to varying wavelength regions can experience color shifts and quality deterioration due to differences in deterioration rates, particularly when synthesizing light from these panels.
Innovation Solution
An optical modulation device comprising electro-optical devices emitting red, green, and blue wavelengths with specific conductive layer thicknesses to equalize the lifetime characteristics, utilizing a dichroic prism to synthesize these lights without polarization separation, and employing organic light-emitting diodes (OLEDs) for self-light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple image display panels with different wavelength regions are used to generate color light, then the display device can achieve full-color image output, but the lifetime characteristics and deterioration rates differ among panels causing color shift and image quality deterioration
Solution Approach 1:
The patent applies local quality by making the conductive layer thickness different for each wavelength region (red, green, blue panels). Specifically, the blue panel has a thinner conductive layer (5-20 nm) compared to red (10-30 nm) and green (10-25 nm) panels. This localized structural adjustment compensates for the inherently shorter lifetime of blue OLEDs, equalizing the luminance deterioration rates across all color panels and preventing color shift during operation.
2Reliability
If the conductive layer thickness is increased to improve electron injection, then the manufacturing complexity and control difficulty increase
Solution Approach 1:
The patent applies parameter changes by optimizing the conductive layer thickness within specific ranges (5-20 nm for blue, 10-30 nm for red, 10-25 nm for green) to achieve the best balance between electron injection efficiency and manufacturing controllability. This parameter optimization ensures reliable device performance while maintaining feasibility for mass production.
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 solution effectively minimizes color shifts and maintains image quality by equalizing the lifetime characteristics of the display panels, ensuring consistent performance and reduced power consumption.
Implementation Method 1
a conductive layer provided between the first electrode and the light-emitting layer, and having a lower reflectance with respect to the light emitted from the light-emitting layer than a reflectance of the first electrode
Implementation Method 2
a prism configured to synthesize light emitted from the first electro-optical device, the second electro-optical device, and the third electro-optical device
Implementation Method 3
a first light-emitting element including a light-emitting layer emitting light including a red wavelength region, a second light-emitting element including a light-emitting layer emitting light including a green wavelength region, a third light-emitting element including a light-emitting layer emitting light including a blue wavelength region
Data Source
AI summary
An optical modulation device includes a first electro-optical device including a first light-emitting element including a light-emitting layer emitting light including a red wavelength region, a second electro-optical device including a second light-emitting element including a light-emitting layer emitting light including a green wavelength region, a third electro-optical device including a third light-emitting element including a light-emitting layer emitting light including a blue wavelength region, and a prism that synthesizes light emitted from the first, second and third electro-optical devices. Each of the first, second and third light-emitting elements includes a first electrode, a second electrode, and a conductive layer provided therebetween and having a lower reflectance with respect to the light emitted from the light-emitting layer than from the first electrode. A thickness of the conductive layer of the third light-emitting element is thinner than thicknesses of the conductive layers of the first and second light-emitting elements.