Modular Micro-LED Pixel Units for Uniform RGB Light Output
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Solution Overview
Problem
Micro LEDs in displays face challenges in handling and replacing defective LEDs due to their small size, and variations in light intensity across sub-pixels due to differences in filter efficiency and current density, leading to inefficient light emission.
Innovation Solution
A LED unit comprising a plurality of pixels with three light emitting cells, each with a conductivity type semiconductor layer and wavelength converters, allowing for independent driving and optimized light emission efficiency through varying cell areas and wavelength conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If micro LEDs are used to achieve high resolution displays, then display resolution is improved, but handling and replacement difficulty increases
Solution Approach 1:
The display is divided into modular LED units, each containing multiple sub-pixels (red, green, blue). This segmentation allows the entire unit to be replaced as one module rather than individual micro LEDs, significantly easing handling and replacement while maintaining high display resolution through the dense arrangement of sub-pixels within each unit.
2Ease of manufacture
If same area light emitting cells are used for all sub-pixels, then manufacturing simplicity is improved, but light intensity uniformity deteriorates
Solution Approach 1:
Different area light emitting cells are assigned to different sub-pixels based on their specific requirements. The red sub-pixel uses a larger area cell to compensate for lower luminous efficiency, while green and blue sub-pixels use smaller area cells. This local customization of cell areas ensures uniform light intensity across all sub-pixels while maintaining reasonable manufacturing complexity.
3Measurement precision
If wavelength converters with different conversion efficiencies are used, then color accuracy is improved, but light emission efficiency deteriorates
Solution Approach 1:
Different area light emitting cells are matched with appropriate wavelength converters based on the specific conversion efficiency requirements of each color channel. The larger area cells compensate for lower conversion efficiency, ensuring that each sub-pixel achieves optimal light output and color accuracy while minimizing overall energy loss through localized optimization.
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
Facilitates easy mounting and replacement of LED units, reduces process complexity, and ensures optimal light emission efficiency by adjusting cell areas based on conversion efficiencies, improving color purity and reducing variations in light intensity.
Implementation Method 1
a first wavelength converter that converts a wavelength of light emitted from the first light emitting cell; and a second wavelength converter that converts a wavelength of light emitted from the second light emitting cell
Data Source
AI summary
A light-emitting diode (LED) unit for a display including a plurality of pixels each including a first light emitting cell, a second light emitting cell, and a third light emitting cell, each of the first, second, and third light emitting cells including a first conductivity type semiconductor layer, an active layer, and a second conductivity type semiconductor layer, a first wavelength converter configured to convert a wavelength of light emitted from the first light emitting cell, a second wavelength converter configured to convert a wavelength of light emitted from the second light emitting cell, in which the first, second, and third light emitting cells of each pixel share the first conductivity type semiconductor layer.