Micro LED Sub-Pixel Layout for Color Purity and Easy Replacement
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Solution Overview
Problem
Micro LED display devices face challenges in mounting and replacing micro LEDs due to their small size, and achieving optimal luminous efficiency and high color purity, as well as preventing color variation when viewed from different angles.
Innovation Solution
A light emitting device comprising first, second, and third light emitting cells with wavelength converters and color filters, where the area ratios of the cells are inversely proportional to the light conversion efficiencies, and partition walls are used to prevent light interference, allowing for optimal current density and efficient light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If micro LEDs are made very small (less than 200 micrometers) to achieve high resolution display, then the display resolution is improved, but the ease of mounting and replacement deteriorates
Solution Approach 1:
The invention divides the micro LED structure into multiple segments: a mounting pad structure with protrusions that engage with corresponding recesses in the substrate, and a replacement structure that allows individual micro LEDs to be removed and replaced. This segmentation enables precise positioning and facilitates maintenance despite the small size of individual LEDs.
Solution Approach 2:
The invention introduces an intermediary mounting structure that includes pads with protrusions and recesses, acting as a mediator between the micro LED and the substrate. This intermediary structure provides mechanical engagement features that make handling and mounting of tiny micro LEDs feasible without requiring complex assembly equipment.
2Illumination intensity
If different operating current densities are applied to different sub-pixels to compensate for filter efficiency differences, then the color purity is improved, but the luminous efficiency deteriorates
Solution Approach 1:
The invention applies different current density characteristics to different sub-pixel regions through dedicated current control circuits for each sub-pixel. This allows each sub-pixel to operate at its optimal current density point, compensating for differences in filter efficiency while maintaining high luminous efficiency by avoiding excessive current density that would cause efficiency droop.
Solution Approach 2:
The invention changes the operating parameters (current density) of different light emitting diodes based on their specific characteristics and the efficiency of their associated color filters. By dynamically adjusting current density parameters for each sub-pixel, the system achieves optimal color purity without sacrificing overall luminous efficiency.
3Manufacturing precision
If a large number of micro LEDs are disposed on one substrate to achieve high resolution, then the display quality is improved, but the device complexity increases
Solution Approach 1:
The invention creates a universal mounting structure and control architecture that can accommodate a large number of micro LEDs through standardized pad designs and modular current control circuits. This universality reduces device complexity by using repeated modular units rather than custom designs for each micro LED position.
Solution Approach 2:
The invention merges multiple functions into integrated structures: the mounting pad structure simultaneously provides electrical connection, mechanical support, and positioning alignment. The current control circuits are integrated with the substrate, combining control functionality with the display structure to reduce overall device complexity despite the high number of micro LEDs.
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
Enables easy mounting and replacement of micro LEDs, maintains high color purity and reproducibility, and prevents color variation when viewed from different angles by optimizing light emission and interference prevention.
Implementation Method 1
a first wavelength converter configured to convert a wavelength of light emitted from the first light emitting cell into a first wavelength, and a second wavelength converter configured to convert a wavelength of light emitted from the second light emitting cell into a second wavelength
Data Source
AI summary
A display apparatus including a substrate, a first sub-pixel, a second sub-pixel, and a third sub-pixel disposed on the substrate and configured to emit red light, green light, and blue light, respectively, partition walls disposed between the first sub-pixel, the second sub-pixel, and the third sub-pixel, and configured to not transmit light, in which the first sub-pixel, the second sub-pixel, and the third sub-pixel include a first light emitting cell, a second light emitting cell, and a third light emitting cell, respectively, and a height of each of the first, second, and third light emitting cells is lower than a height of the partition walls, and a difference between the height of the partition walls and the height of each of the first, second, and third light emitting cells is less than 100 μm.