Dual Blue Subpixel OLED Display for Distinct Wavelength Generation
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Solution Overview
Problem
Conventional display apparatuses have difficulty in realizing various colors under different conditions, particularly in generating distinct blue colors.
Innovation Solution
A display apparatus is designed with unit pixels comprising first and second blue sub-pixels, a green sub-pixel, and a red sub-pixel, each with intermediate layers of different thicknesses and materials, including sky blue and deep blue organic emission layers with specific dopants, to emit light with different wavelengths, allowing for the generation of two blue colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional display apparatus uses standard organic emission layers, then the device structure remains simple, but it cannot generate distinct blue colors with different wavelengths
Solution Approach 1:
The display apparatus divides the blue color generation into two separate blue sub-pixels, each with its own intermediate layer. The first blue sub-pixel uses a first intermediate layer with a first blue organic emission layer, while the second blue sub-pixel uses a second intermediate layer with a second blue organic emission layer. This segmentation allows independent control of different blue wavelengths, enabling versatile color generation while maintaining a manageable device structure through modular design.
Solution Approach 2:
The patent applies local quality by giving each blue sub-pixel distinct properties through different intermediate layer configurations. The first intermediate layer and second intermediate layer have different thicknesses and different organic emission layer materials, creating localized variations in light emission characteristics. This allows each region to emit a specific blue wavelength (first blue and second blue) while maintaining overall device functionality.
2Manufacturing precision
If the intermediate layers have different thicknesses and materials, then distinct blue colors with different wavelengths can be generated, but the manufacturing process becomes more complex
Solution Approach 1:
The patent controls color wavelength by changing key parameters of the intermediate layers, specifically thickness and organic emission layer material composition. The first intermediate layer has a first thickness and the second intermediate layer has a second thickness different from the first. Additionally, the organic emission layers use different dopants (first dopant and second dopant) to tune the emission wavelengths. These parameter changes enable precise control over the blue color wavelengths while using established OLED manufacturing techniques.
3Adaptability or versatility
If multiple blue sub-pixels with different intermediate layers are used, then various blue colors can be realized under different conditions, but the device structure becomes more complex
Solution Approach 1:
The display apparatus achieves multi-functionality by enabling the same blue sub-pixel structure to emit different blue wavelengths under different operating conditions. By controlling which blue sub-pixel is activated and adjusting the intermediate layer properties, the device can generate first blue color, second blue color, or combinations thereof. This universal design allows versatile blue color generation without requiring completely separate structures for each wavelength.
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 enables the display apparatus to produce blue colors with distinct wavelengths, suitable for applications such as wake-up light alarms and sleep promotion, by optimizing the thickness and materials of the intermediate layers.
Implementation Method 1
a first blue sub pixel including a first intermediate layer, the first intermediate layer including a first blue organic emission layer; a second blue sub pixel including a second intermediate layer, the second intermediate layer including a second blue organic emission layer
Data Source
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AI summary
A display apparatus (10) includes a unit pixel comprising a red sub pixel (R), a green sub pixel (G), a first blue sub pixel (B1), and a second blue sub pixel (B2). Each of the sub pixels include a first electrode (18a), an intermediate layer (18b) comprising an organic emission layer disposed on the first electrode (18a), and a second electrode (18c) disposed on the intermediate layer (18b-1, 18b-2, 18b-3, 18b-4). The first blue sub pixel (B1) includes a first intermediate layer (18b-1) including a first blue organic emission layer (18b-1a), the second blue sub pixel (B2) includes a second intermediate layer (18b-2) including a second blue organic emission layer (18b-2a), the green sub pixel (G) includes a third intermediate layer (18b-3) including a green organic emission layer (18b-3a), and the red sub pixel (R) includes a fourth intermediate layer (18b-4) including a red organic emission layer (18b-4a). The first intermediate layer (18b-1) and the second intermediate layer (18b-2) have different thicknesses, and the third intermediate layer (18b-3) and the fourth intermediate layer (18b-4) may also have different thicknesses.