Micro LED Display Device With Pixel Separators For Color Interference
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Solution Overview
Problem
Current micro LED technology lacks the capability to implement full-color displays, as existing micro LED panel fabrication techniques are limited to single-color outputs, and there is a need for a process to transfer a separated thin film GaN layer to a flexible substrate for flexible and thin micro LED light sources.
Innovation Solution
A micro LED display device with a separator structure formed on a growth substrate or emission structure between pixels, allowing for the injection of R/G/B color light changing materials or fluorescent substances, and a method of fabricating the same by flip-chip bonding a micro LED panel onto a CMOS backplane with a photolithography process to minimize color interference and light scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If micro LED pixels are fabricated without separators, then the device structure is simpler and manufacturing is easier, but color interference and light scattering occur between adjacent pixels reducing display quality
Solution Approach 1:
The patent introduces separator structures that divide the micro LED panel into distinct pixel regions. These separators physically segment the active areas, preventing color interference and light scattering between adjacent pixels while maintaining a manageable manufacturing process through systematic placement.
Solution Approach 2:
The separators are strategically positioned only at critical boundaries between pixels where color interference occurs, rather than uniformly across the entire panel. This localized approach maintains manufacturing simplicity while achieving the necessary display quality improvement at specific problem areas.
2Manufacturing precision
If separators are added between micro LED pixels, then color interference and light scattering are reduced improving display quality, but the device structure becomes more complex and manufacturing difficulty increases
Solution Approach 1:
The separator structures are designed as separate, extractible elements that can be independently fabricated and then integrated into the micro LED panel. This extraction approach allows for standardized separator production and simplifies the overall manufacturing process despite the added structural element.
Solution Approach 2:
The separators serve multiple functions simultaneously: they prevent color interference, reduce light scattering, provide structural support, and facilitate alignment during assembly. This multi-functionality justifies the added structural complexity by delivering multiple benefits from a single element.
3Ease of manufacture
If traditional single-color micro LED fabrication is used, then the manufacturing process is simpler and more established, but full-color display capability cannot be achieved
Solution Approach 1:
The patent employs a nested structure where multiple micro LED pixels of different colors (red, green, blue) are arranged in combinations within each pixel unit. This nesting of multiple color elements enables full-color display capability while maintaining compatibility with existing single-color fabrication processes for each individual LED type.
Solution Approach 2:
The micro LED panel uses composite structures combining different colored LED pixels (red, green, blue) with separator materials and substrate layers. This composite approach enables full-color display functionality by integrating multiple material types and color sources while leveraging established manufacturing techniques for each component.
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 the implementation of full-color displays with high resolution by effectively removing color interference and light scattering, allowing for the application of R/G/B color light changing materials or fluorescent substances between separators, thereby achieving a high-resolution, flexible, and thin micro LED display.
Implementation Method 1
a method of fabricating the same by flip-chip bonding a micro LED panel onto a CMOS backplane with a photolithography process
Implementation Method 2
injecting a fluorescent substance for emitting a white color between separators and disposing a color filter on the fluorescent substance
Data Source
AI summary
Disclosed is a micro light emitting diode (LED) display device which is capable of implementing a full color of high resolution, the micro LED display device including: a micro LED driving substrate (backplane) in which a plurality of CMOS cells is arranged in rows and columns; and a micro LED panel which is flip-chip bonded onto the micro LED driving substrate, and includes a plurality of micro LED pixels electrically connected with the plurality of CMOS cells, in which the micro LED panel includes the plurality of micro LED pixels formed by etching a first surface of an emission structure along a unit pixel region, and a plurality of separators formed on a second surface of the emission structure corresponding to positions of portions formed by etching the emission structure in a vertical direction.