OLED Display Color Accuracy via Segmented Emission Layers
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Solution Overview
Problem
Conventional organic light-emitting display devices using primary colors red, green, and blue struggle to accurately display colors close to natural colors, particularly distinguishing between deep and light shades of yellow, cyan, and magenta.
Innovation Solution
Incorporating deep-red, light-red, deep-blue, light-blue, deep-green, and light-green light-emitting layers with specific emission peak wavelengths into the organic light-emitting display device, allowing for the creation of sub-pixels that enhance color display capabilities beyond traditional primary colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional primary color light-emitting layers (red, green, blue) are used, then the device structure remains simple, but the color display accuracy and ability to distinguish deep and light shades deteriorates
Solution Approach 1:
The patent divides each primary color light-emitting layer into multiple sub-layers with different emission characteristics. Specifically, the red light-emitting layer is segmented into deep-red and light-red sub-layers, the green light-emitting layer into deep-green and light-green sub-layers, and the blue light-emitting layer into deep-blue and light-blue sub-layers. This segmentation enables precise control over color shades and improves color display accuracy while maintaining a systematic structure.
2Adaptability or versatility
If only three primary color pixels are used, then the device complexity is low, but the ability to display additional colors and natural hues deteriorates
Solution Approach 1:
Each pixel is segmented into multiple sub-pixels corresponding to different color shades. For example, a red pixel contains both deep-red and light-red sub-pixels, allowing independent control of different red shades. This enables the display of additional colors and natural hues that cannot be achieved with conventional single-shade pixels, while maintaining a systematic pixel structure.
Solution Approach 2:
Different regions within each pixel are assigned different emission characteristics. The deep-color sub-pixels emit light with higher wavelength concentration for deep shades, while light-color sub-pixels emit light with lower wavelength concentration for light shades. This local differentiation of emission properties enables versatile color display capability.
3Manufacturing precision
If conventional red, green, and blue light-emitting layers are used, then the manufacturing process remains simple, but the distinguishability between deep and light shades deteriorates
Solution Approach 1:
The light-emitting layers are fabricated as multiple discrete sub-layers with specific emission peak wavelengths. Each sub-layer can be manufactured using standard organic light-emitting material deposition techniques, but with precise control over the emission characteristics of each layer. This segmentation approach enables high shade distinguishability while using conventional manufacturing methods.
Solution Approach 2:
The patent controls the emission peak wavelengths of each sub-layer to achieve optimal shade distinguishability. Deep-color sub-layers are designed with emission peaks shifted toward the center of their color range, while light-color sub-layers have emission peaks shifted toward the edge. This parameter optimization enables clear distinction between deep and light shades.
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
Enables the display of additional colors and improved distinguishability between deep and light shades, effectively rendering colors closer to natural hues.
Implementation Method 1
holes injected from the hole injection electrode and electrons injected from the electron injection electrode are combined with each other in the light-emitting layer to form excitons, and light is emitted by energy that is generated when the excitons fall to the ground state
Data Source
AI summary
An organic light-emitting display device including a red light-emitting layer that includes a deep-red light-emitting layer and a light-red light-emitting layer, and a blue light-emitting layer that includes a deep-blue light-emitting layer and a light-blue light-emitting layer. The organic light-emitting display device is capable of displaying a deep color and a light color so as to be distinguishable from each other.