Color Conversion Display Layout for BT.2020 Blue Vertex Alignment
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Solution Overview
Problem
Conventional display devices using short-wavelength light sources, such as blue light or ultraviolet light, struggle to achieve optimal color reproduction rates due to the dominant wavelength deviating from color reproduction standards like BT.2020, leading to inadequate color representation, especially around the blue vertex.
Innovation Solution
A display device with a substrate featuring a light source generating a first dominant wavelength outside the color triangle, accompanied by conversion layers and color filter layers to convert the light into second and third dominant wavelengths corresponding to the color vertices, ensuring the second light is positioned at the blue vertex of the BT.2020 standard, thereby improving color reproduction rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If short-wavelength light sources (blue light or ultraviolet light) are used to increase excitation efficiency in the color conversion layer, then the excitation efficiency increases, but the dominant wavelength deviates further from the blue vertex of the BT.2020 standard, causing color reproduction rate to deteriorate
Solution Approach 1:
The patent introduces a color conversion layer as an intermediary between the short-wavelength light source and the display output. This layer converts the blue or ultraviolet light from the light source into green light, and then a phosphor conversion layer converts the green light into red light. This two-stage conversion process allows the system to use short-wavelength light sources for high excitation efficiency while still achieving accurate color reproduction by converting to the appropriate wavelengths for each color channel.
Solution Approach 2:
The patent changes the wavelength parameter of the light through sequential conversion processes. The light source emits blue or ultraviolet light (short wavelength), the color conversion layer converts it to green light (medium wavelength), and the phosphor conversion layer converts it to red light (long wavelength). This parameter transformation allows the system to maintain high excitation efficiency at the source while delivering the correct wavelength parameters for accurate color reproduction.
2Manufacturing precision
If the dominant wavelength of the light source is positioned at the blue vertex of the BT.2020 standard to improve color reproduction, then color reproduction rate improves, but excitation efficiency of the color conversion layer decreases
Solution Approach 1:
The patent segments the color conversion process into distinct stages: the color conversion layer handles the blue to green conversion, and the phosphor conversion layer handles the green to red conversion. This segmentation allows each layer to be optimized for its specific function - the color conversion layer can be optimized for high excitation efficiency with blue light, while the phosphor conversion layer converts the green light to red light with appropriate efficiency.
Solution Approach 2:
The patent uses green light as an intermediary wavelength between the blue light source and the final red light output. The color conversion layer converts blue light to green light, and the phosphor conversion layer converts green light to red light. This intermediary approach allows the system to achieve both high excitation efficiency at the blue wavelength and accurate color reproduction at the red 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
The solution enhances color reproduction rates by adjusting the density of green conversion materials in the conversion layers, ensuring the second dominant wavelength aligns with the blue vertex, meeting various color reproduction standards and improving the overall color representation.
Implementation Method 1
a conversion layer disposed on the substrate to convert the first light into a plurality of lights having different dominant wavelengths
Data Source
AI summary
The display device includes a light source that generates first light, a conversion layer that outputs a plurality of lights using the first light, and a color filter layer.The conversion layer includes first to third conversion layers, and the color filter layer includes first to third color filters. The first conversion layer and the second conversion layer may include the same material.The first conversion layer and the first color filter may convert the first dominant wavelength of the first light to output second light having a second frequency. The second dominant wavelength of the second light may be located at the first color vertex of the color reproduction rate standard.