Micro LED Pixel Unit Structure for Color Uniformity and Handling
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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 incorporates an LED unit with multiple light emitting cells of varying sizes, each with a wavelength converter, allowing for optimized light emission efficiency and easier mounting/replacement, where the second light emitting cell has a larger area than the first, and the third larger than the second, with color filters to enhance color purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If micro LEDs are made extremely small (200 μm or less, further 100 μm or less) to increase pixel density, then the display resolution is improved, but the ease of handling and replacement of LEDs deteriorates
Solution Approach 1:
The invention divides the display into modular units called light emitting units, where each unit contains multiple sub-pixels (red, green, blue) and their associated control circuits. This segmentation allows the entire unit to be handled and replaced as a single module rather than individual micro LEDs, resolving the contradiction between high resolution and ease of handling.
Solution Approach 2:
The patent introduces light emitting units as intermediary components between the micro LEDs and the display panel. These units serve as manageable modules that encapsulate the extremely small micro LEDs, making them easier to handle, test, and replace while maintaining the high resolution benefits of small-sized LEDs.
2Stability of the object's composition
If different operating current densities are applied to each light emitting diode to compensate for filter efficiency differences, then color uniformity across sub-pixels is improved, but light emitting efficiency deteriorates
Solution Approach 1:
The invention applies different current densities to different light emitting diodes based on their specific characteristics and the efficiency of their associated color filters. Each LED operates at an optimized current density tailored to its local requirements, achieving uniform color output across all sub-pixels while minimizing energy loss.
Solution Approach 2:
The patent dynamically adjusts the operating current density parameter for each light emitting diode according to the efficiency characteristics of its corresponding color filter. By changing this electrical parameter locally, the system achieves uniform color emission without sacrificing overall light emitting efficiency.
3Manufacturing precision
If a large number of micro LEDs are arranged on a single substrate to create micro LED display, then the display quality is improved, but the device complexity increases
Solution Approach 1:
The invention segments the complex micro LED display into multiple light emitting units, where each unit contains a manageable number of sub-pixels and their control circuits. This segmentation reduces the complexity of handling and manufacturing the entire display by breaking it down into standardized, repeatable modules.
Solution Approach 2:
The patent designs light emitting units with universal structures that can be repeatedly assembled to form the complete display. Each unit serves multiple functions including light emission, color filtering, and local control, reducing overall device complexity through functional integration and standardization.
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 enables improved light emission efficiency and easier handling of LEDs, facilitating uniform light distribution across sub-pixels, enhancing color purity and simplifying the mounting and replacement processes.
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.