Micro LED Display with Wavelength Conversion Layers
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Solution Overview
Problem
Current full color LED displays face challenges in achieving better performance and color fidelity, necessitating advancements in technology to enhance luminance intensity and color representation.
Innovation Solution
The LED display incorporates a micro light emitting device with a wavelength conversion layer that converts initial wavelengths into predetermined wavelengths, allowing for the creation of different colors, thereby enabling the display of full color images through the combination of various light colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple different color micro light emitting devices are used for different sub-pixels, then color representation is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent uses a single blue micro light emitting device structure for all sub-pixels, making it universal. Each sub-pixel achieves different colors not by using different LED devices, but by applying different wavelength conversion layers (yellow phosphor for green, red phosphor for red) on the same blue LED structure, thus achieving multi-functionality from a single device type
Solution Approach 2:
The patent introduces wavelength conversion layers as intermediary materials between the blue micro light emitting device and the final output colors. These phosphor layers convert the blue light into different wavelengths (yellow, red, green) to achieve the desired color output without changing the underlying LED device structure
2Illumination intensity
If multiple different color micro light emitting devices are used for different sub-pixels, then color fidelity is improved, but manufacturing precision requirements increase
Solution Approach 1:
By using the same blue micro light emitting device for all sub-pixels, the patent eliminates the need to manufacture and assemble multiple different colored LED devices. The universal blue LED structure is combined with different wavelength conversion layers during packaging, significantly reducing manufacturing precision requirements compared to assembling different colored micro LEDs
Solution Approach 2:
The patent changes the output color parameter by modifying the wavelength conversion layer composition rather than changing the LED device itself. By adjusting phosphor materials and their ratios in the wavelength conversion layers, different colors are achieved from the same blue LED source, simplifying manufacturing while maintaining color fidelity
3Illumination intensity
If wavelength conversion layer is used to convert light wavelengths, then color representation is improved, but light extraction efficiency may be affected
Solution Approach 1:
The patent applies different wavelength conversion layers selectively to different sub-pixel regions. Each sub-pixel has its specific phosphor composition optimized for its target color output, while the underlying blue LED structure remains uniform. This local optimization of wavelength conversion properties minimizes energy loss while achieving accurate color representation
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 solution effectively enhances color representation and simplifies manufacturing by using a single color micro light emitting device for all sub-pixels, improving luminance efficiency and light extraction efficiency.
Implementation Method 1
the wavelength conversion layer converts the light from a range of initial wavelengths into a range of predetermined wavelengths
Data Source
AI summary
A LED display includes a bottom substrate, a first bottom electrode, a micro light emitting device, a wavelength conversion layer, an opposite electrode, and a first isolation layer. The first bottom electrode is disposed on the bottom substrate. The micro light emitting device is disposed on the first bottom electrode and includes at least one current controlling structure having at least one opening therein. The wavelength conversion layer covers the micro light emitting device, in which the wavelength conversion layer converts the light from a range of initial wavelengths into a range of predetermined wavelengths, and the range of predetermined wavelengths is greater than the range of initial wavelengths. The opposite electrode is electrically connected to the micro light emitting device. The first isolation layer is disposed between the micro light emitting diode and the opposite electrode to isolate the first bottom electrode and the opposite electrode.