Micro LED Display Layout With Phosphor Color Conversion
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Solution Overview
Problem
High-definition display devices using micro LEDs face challenges in efficiently disposing micro LEDs on substrates, which can complicate the arrangement and reduce luminous efficacy due to the need for precise placement of light emitting elements for different colors.
Innovation Solution
A display device configuration featuring a first substrate with pixels, a light emitting element substrate, anode electrodes, and phosphor layers covering light emitting parts, allowing for efficient light conversion and higher luminous efficacy by using blue light emitting micro LEDs for all pixels, which are then converted to red and green light using phosphor layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If micro LEDs are disposed corresponding to respective pixels on a substrate to achieve high-definition display, then display definition is improved, but device complexity increases due to the need for precise placement of individual LEDs for each pixel
Solution Approach 1:
The light emitting element is segmented into multiple light emitting parts (first light emitting part, second light emitting part, third light emitting part) that can be disposed in a simplified manner while still providing the necessary color coverage for high-definition display. Each light emitting part corresponds to different color regions (blue, green, red) and can be independently controlled to achieve pixel-level precision without requiring individual LED placement for each pixel.
Solution Approach 2:
A single light emitting element substrate integrates multiple light emitting parts that serve different color functions (blue, green, red), allowing one substrate to replace multiple individual LED components. This multi-functional design simplifies the overall device structure while maintaining the capability for high-definition color display across all pixels.
2Manufacturing precision
If individual LEDs for different colors are placed for each pixel to achieve accurate color display, then color accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
Multiple light emitting parts (first light emitting part emitting blue light, second light emitting part emitting green light, third light emitting part emitting red light) are merged into a single light emitting element substrate. This integration maintains color accuracy for each pixel while dramatically simplifying the manufacturing process by reducing the number of discrete components that need to be placed and aligned.
Solution Approach 2:
The invention transitions from a planar arrangement of individual LEDs to a three-dimensional stacked structure where multiple light emitting parts are vertically integrated on a single substrate. This dimensional change allows for simplified manufacturing while maintaining the color precision required for high-definition display.
3Device complexity
If blue light emitting diodes are used for all pixels with light conversion structures to achieve red and green light, then device complexity is reduced, but luminous efficacy may be affected
Solution Approach 1:
Different light emitting parts are positioned in specific local regions corresponding to different color requirements. The first light emitting part (blue) is positioned to illuminate the second pixel, while the second light emitting part (green) and third light emitting part (red) are positioned for their respective pixels. This local optimization ensures that each region receives the appropriate wavelength of light for maximum phosphor conversion efficiency, thereby maintaining high luminous efficacy while using a simplified single-substrate structure.
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 enhances the luminous efficacy of the display device by simplifying the arrangement of light emitting elements and ensuring uniform chromaticity across different observation directions, while reducing the complexity of placing individual LEDs for each pixel.
Implementation Method 1
a plurality of phosphor layers provided to the respective light emitting parts and each covering at least part of the corresponding light emitting part
Implementation Method 2
Light output from the blue light emitting diode is converted into red or green light by a light conversion structure
Data Source
AI summary
A display device comprising: a first substrate; a plurality of pixels provided to the first substrate; a light emitting element comprising a light emitting element substrate provided over the pixels and a plurality of light emitting parts provided to the light emitting element substrate corresponding to the respective pixels; an anode electrode provided to the first substrate and electrically coupled to the light emitting element; and a plurality of phosphor layers provided to the respective light emitting parts and each covering at least part of the corresponding light emitting part.