Micro LED Display Stacked Pixel Integration with Driving Circuit
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Solution Overview
Problem
Current micro LED displays face challenges in reducing pixel size and power consumption while maintaining resolution and accuracy in pixel arrangement, due to complex pixel structures and inefficient fabrication methods.
Innovation Solution
A micro LED display is fabricated using an integrated circuit (IC) device with a wired driving circuit, where multiple partial pixels emitting different colors are stacked and electrically connected to the driving circuit via connection members, simplifying the pixel structure and enabling accurate arraying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If pixels are fabricated using conventional methods with color filters and phosphors, then color emission is achieved, but pixel size cannot be reduced and power consumption increases
Solution Approach 1:
The patent transitions from planar pixel structures to three-dimensional stacked structures by vertically stacking multiple sub-pixels emitting different colors (red, green, blue) on top of each other. This vertical arrangement reduces the lateral footprint of each pixel while maintaining full-color emission capability, thereby reducing pixel size without increasing power consumption
Solution Approach 2:
The patent combines multiple sub-pixels emitting different colors into a single integrated pixel structure. By merging red, green, and blue sub-pixels vertically within one pixel location, the invention achieves full-color emission from a compact stacked structure, reducing both pixel size and power consumption compared to conventional lateral arrangements with color filters and phosphors
2Ease of manufacture
If pixels are individually arrayed using pick and place method, then pixel arrangement is flexible, but positioning accuracy is degraded
Solution Approach 1:
The patent merges multiple sub-pixels (red, green, blue) into a single stacked pixel unit that is fabricated as one integrated structure. This unified structure is then arrayed as a complete pixel unit using pick and place method, ensuring that all sub-pixels are precisely positioned together without the positioning errors that would occur if individual sub-pixels were placed separately. This maintains fabrication flexibility while achieving high positioning accuracy
3Illumination intensity
If complex pixel structures with color filters and phosphors are used, then color emission is achieved, but fabrication complexity increases
Solution Approach 1:
The patent extracts and eliminates the color filter layer and phosphor materials from the pixel structure. Instead of using these additional components to achieve color emission, the invention directly employs light-emitting diodes in red, green, and blue that inherently emit their respective colors. This removal of unnecessary components simplifies the pixel structure while maintaining full-color emission capability
Solution Approach 2:
The patent changes the emission parameters by selecting LED materials and structures that directly emit red, green, and blue light without requiring color conversion through filters or phosphors. By changing from indirect color generation (white light + color filter/phosphor) to direct color emission (red LED, green LED, blue LED), the invention simplifies the pixel structure while achieving the same color emission function
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 approach allows for a reduction in pixel size and power consumption while ensuring accurate pixel arrangement, simplifying the fabrication process and improving display resolution.
Implementation Method 1
a first light-emitting diode for emitting a red light, a second light-emitting diode for emitting a green light, and a third light-emitting diode for emitting a blue light
Data Source
AI summary
Disclosed is a micro LED display having a multi-color pixel array and a method of fabricating the same based on integration with a driving circuit thereof. According to various embodiments, the display may be fabricated by providing an IC device in which a driving circuit has been wired, forming, in one surface of the IC device, a plurality of pixels on which a plurality of partial pixels for emitting different color lights has been stacked, and electrically connecting the partial pixels to the driving circuit using connection members.