Micro LED Pixel Unit Structure for Uniform RGB Intensity
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Solution Overview
Problem
Micro LED displays face challenges in handling and replacing small-sized LEDs due to their tiny size, leading to difficulties in maintaining uniform light intensity across sub-pixels, which affects color purity and overall light emission efficiency.
Innovation Solution
The design of an LED unit comprising multiple light emitting cells with varying areas and wavelength converters, allowing for independent driving of sub-pixels to optimize light emission efficiency and facilitate easier mounting and replacement, with a structure that includes a first, second, and third light emitting cell, each with a specific conductivity type semiconductor layer and active layer, and wavelength converters to convert ultraviolet light into blue, green, and red light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If micro LEDs are made extremely small (200 μm or less, further 100 μm or less) to increase pixel density, then display resolution is improved, but handling and replacement difficulty increases significantly
Solution Approach 1:
The invention divides the display into modular pixel units, each containing multiple sub-pixels with independent light emitting elements. This segmentation allows the entire pixel unit to be handled and replaced as a single module, overcoming the difficulty of manipulating extremely small individual micro LEDs while maintaining high display resolution through the dense arrangement of sub-pixels within each module.
2Ease of manufacture
If the same light emitting diode is used for all sub-pixels, then manufacturing is simplified, but differences in filter efficiency cause non-uniform light intensity across sub-pixels
Solution Approach 1:
The invention applies different characteristics to different sub-pixels by varying the light emitting element area according to the specific wavelength conversion efficiency requirements of each sub-pixel type (red, green, blue). This local optimization ensures that each sub-pixel compensates for its specific filter efficiency characteristics, achieving uniform light intensity across all sub-pixels while maintaining manufacturing feasibility through systematic design.
Solution Approach 2:
The invention changes the physical parameter of light emitting element area to compensate for differences in wavelength conversion efficiency and filter characteristics. By adjusting the area parameter of light emitting elements in different sub-pixels, the system achieves uniform light output intensity across all sub-pixels, resolving the non-uniformity issue that arises from using identical light emitting diodes for all sub-pixels.
3Illumination intensity
If operating current density is changed to compensate for filter efficiency differences, then light intensity uniformity is improved, but light emitting efficiency decreases
Solution Approach 1:
The invention changes the physical parameter of light emitting element area instead of operating current density to compensate for filter efficiency differences. By adjusting the area parameter, the system achieves uniform light intensity across sub-pixels while maintaining optimal current density operation, thereby preserving light emitting efficiency and avoiding the energy loss that would result from current density adjustments.
4Adaptability or versatility
If a large number of micro LEDs are arranged on a single substrate to create micro LED display, then display capability is improved, but the small size (200 μm or less, further 100 μm or less) causes handling and replacement difficulties
Solution Approach 1:
The invention segments the display system into modular pixel units, each containing multiple sub-pixels with independently optimized light emitting elements. This modular segmentation enables the entire pixel unit to be handled and replaced as a single manageable component, overcoming the difficulties associated with manipulating extremely small individual micro LEDs while maintaining the high display capability achieved through dense micro LED arrangement.
Solution Approach 2:
The invention creates universal pixel modules that can be systematically arranged to form displays of various sizes and resolutions. Each pixel module serves multiple functions: it contains the light emitting elements, wavelength conversion layers, and color filters integrated in a standardized configuration, enabling these modules to be universally applied across different display implementations while maintaining ease of handling and replacement.
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 enables improved light emission efficiency and easier handling of LEDs by optimizing the area ratios of light emitting cells based on wavelength conversion efficiencies, ensuring uniform light intensity across sub-pixels and enhancing color purity, thus addressing the challenges of small-sized LEDs in micro LED displays.
Implementation Method 1
a first wavelength converter that converts a wavelength of light emitted from the first light emitting cell... 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.