Pixel Light Collection Layer for Color Conversion Displays
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Solution Overview
Problem
Display devices face challenges in preventing color mixing between adjacent pixel areas, which affects display quality, especially in organic electroluminescence devices where colors may bleed due to the nature of light emission and conversion.
Innovation Solution
Incorporating a light collection layer between the light emitting element layer and the color conversion layer to collect and direct first color light efficiently, reducing color mixing by ensuring each pixel area emits light of a specific wavelength without interference from adjacent areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If quantum dots are used as a color conversion layer to convert light from light emitting elements, then display quality is improved, but colors may mix between adjacent pixel areas
Solution Approach 1:
The patent divides the light collection function into separate collection regions that correspond to individual pixel areas. The light collection layer segments the light paths from different light emitting elements, directing each color light to its designated color conversion layer while preventing cross-contamination between adjacent pixels. This segmentation resolves the color mixing issue while preserving the high display quality enabled by quantum dots.
Solution Approach 2:
The patent introduces a light collection layer as an intermediary component between the light emitting element layer and the color conversion layer. This intermediate layer collects and directs the light from each light emitting element before it reaches the color conversion layer, ensuring that each color light is properly directed to its corresponding quantum dot region. This intermediary structure prevents color mixing while maintaining the benefits of quantum dot color conversion.
2Adaptability or versatility
If light is emitted from multiple light emitting elements, then color variety is achieved, but light efficiency decreases due to color mixing
Solution Approach 1:
The light collection layer is divided into distinct collection regions, each responsible for collecting light from a specific light emitting element and directing it to the corresponding color conversion layer. This segmentation ensures that light energy from each source is efficiently utilized for its intended color conversion, preventing energy waste from color mixing while maintaining diverse color output.
Solution Approach 2:
Different regions of the light collection layer are optimized for collecting specific color lights from different light emitting elements. Each region has properties tailored to its function, such as specific optical characteristics that enhance collection efficiency for particular wavelengths. This local optimization ensures maximum light efficiency for each color channel while preserving the overall color variety of the display.
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 light efficiency and display quality by minimizing color mixing, allowing each pixel area to emit light of the intended color, thereby improving color purity and reproducibility.
Implementation Method 1
a light collection layer disposed between the light emitting element layer and the color conversion layer to collect the first color light, thereby providing the collected first color light to the color conversion layer
Implementation Method 2
the quantum dots may be used as a color conversion layer that converts the light having the specific color into light having different colors so as to display colors
Data Source
AI summary
A display device includes a light emitting element layer including a plurality of light emitting elements configured to output first color light, a color conversion layer on the light emitting element layer to receive the first color light, the color conversion layer being configured to convert the first color light so as to output at least two lights having colors different from each other, and a light collection layer between the light emitting element layer and the color conversion layer to collect the first color light, thereby providing the collected first color light to the color conversion layer. The light collection layer that collects the first color light may be disposed between the color conversion layer and the light emitting element layer to improve the light efficiency of the first color light outputted from the light emitting element layer, and also to prevent (or reduce) the colors from being mixed between the pixel areas, thereby improving the display quality.