Green OLED Array Substrate with Color Conversion Layers for AR Displays
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Solution Overview
Problem
Monochrome OLED display products in Augmented Reality (AR) products face low brightness and poor display performance due to inefficient light utilization and poor stability of blue OLED components, limiting their application.
Innovation Solution
An array substrate with sub-pixels featuring a green electroluminescence component and color conversion layers that convert green light into red and blue light, utilizing materials like isothiocyanate, fluoroboron-based fluorescent dyes, and rare earth doped phosphors to enhance light utilization and stability, along with scattering structures to balance brightness across viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a monochrome OLED structure (WOLED combined with color film and fluorescence) is used, then the brightness is improved compared to simple WOLED, but the light utilization rate remains low due to spectral mismatch between phosphor absorption and OLED emission
Solution Approach 1:
The patent uses color conversion layers containing phosphors (yellow phosphor for red sub-pixels, blue phosphor for green sub-pixels, red phosphor for blue sub-pixels) that convert the green light emitted by the OLED into the required display colors. This approach changes the color of the emitted light to match the absorption spectra of the phosphors, achieving high light utilization rate while maintaining high brightness.
2Illumination intensity
If blue OLED is used to achieve high brightness, then the brightness can be increased, but the lifetime and stability are poor
Solution Approach 1:
Instead of using blue OLED directly to emit blue light, the patent uses green OLED (which has better stability and lifetime) combined with a red phosphor color conversion layer that converts green light to blue light. This inverts the conventional approach of using blue OLED, achieving high blue brightness while maintaining the superior stability of green OLED.
3Reliability
If red phosphor and green phosphor are used in WOLED combined with fluorescence structure, then the color display is improved, but the brightness is still limited due to low fluorescence utilization
Solution Approach 1:
The patent applies different color conversion layers to different sub-pixels based on their specific requirements: yellow phosphor for red sub-pixels, blue phosphor for green sub-pixels, and red phosphor for blue sub-pixels. This localized optimization ensures that each sub-pixel has high light utilization rate, thereby achieving high overall brightness while maintaining good color display performance.
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 significantly improves brightness and display performance by optimizing light conversion efficiency and stability, particularly for red and blue sub-pixels, while maintaining high green light brightness, thus enhancing user experience and AR product capabilities.
Implementation Method 1
a first up-conversion luminescence layer that converts green light into red light
Implementation Method 2
a down-conversion luminescence layer that converts green light into near-infrared light
Implementation Method 3
an second up-conversion luminescence layer that converts the near-infrared light into blue light
Implementation Method 4
a green electroluminescence component
Data Source
AI summary
The present disclosure is related to an array substrate. The array substrate may include a substrate; and a plurality of sub-pixels emitting different colors of light on the substrate. Each of the plurality of sub-pixels may include a green electroluminescence component, and each of the plurality of the sub-pixels other than green sub-pixels further may include a color conversion layer on a light-exiting side of the green electroluminescence component.