Micro-LED Pixel Structure With Vertical Stacking for Red Brightness
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Solution Overview
Problem
Micro-LED displays face challenges in reducing the number of micro-LEDs mounted on a circuit board without compromising the intensity of red light emission, particularly in pixel modules where red light intensity is relatively low.
Innovation Solution
A pixel device is designed with a first light emitting device emitting red light, a second light emitting device emitting green or blue light, and a third light emitting device emitting the same or different color, stacked vertically, and connected through connection layers to enhance red light intensity and reduce the overall number of micro-LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If micro-LEDs are stacked vertically in pixel modules to reduce the number of mounted devices, then the number of micro-LEDs is reduced, but the intensity of red light emission decreases
Solution Approach 1:
The patent transitions from horizontal arrangement of micro-LEDs to vertical stacking configuration, utilizing the third dimension (depth) to accommodate multiple light emitting devices. This dimensional change allows multiple micro-LEDs to be integrated within a compact footprint, reducing the total number of devices while maintaining or enhancing light output intensity through optimized vertical light extraction paths.
Solution Approach 2:
The patent combines multiple light emitting devices (including red, green, and blue micro-LEDs) into a single integrated pixel module structure. By merging these devices vertically and sharing common support structures, electrical connections, and packaging elements, the design reduces the overall device count while achieving full-color display capability with enhanced red light intensity through the combined emission of multiple red micro-LEDs.
2Illumination intensity
If more micro-LEDs are mounted to increase red light intensity, then the intensity of red light is improved, but the number of micro-LEDs increases
Solution Approach 1:
Instead of increasing the number of micro-LEDs in the horizontal plane, the patent utilizes vertical stacking to position multiple red light emitting devices above one another. This vertical arrangement allows multiple red micro-LEDs to contribute to red light intensity while occupying minimal lateral space, effectively increasing light output without proportionally increasing device count or area.
Solution Approach 2:
The patent designs a universal pixel module structure that can accommodate multiple light emitting devices with different functions (red, green, blue) within a single integrated unit. This multi-functional design allows the module to achieve full-color display capability while using shared infrastructure (substrate, connection structures, packaging), thereby reducing the overall number of discrete components needed.
3Quantity of substance
If micro-LEDs are made smaller to increase display density, then the display density is improved, but the transfer and mounting difficulty increases
Solution Approach 1:
The patent segments the display into modular pixel units, each containing multiple stacked micro-LEDs. This segmentation allows for standardized module fabrication and simplifies the transfer process, as complete functional units can be moved and mounted together rather than handling individual tiny micro-LEDs. The modular approach maintains high display density while improving manufacturability through standardized handling sizes.
Solution Approach 2:
The patent implements a nested structure where multiple micro-LEDs are vertically integrated within each pixel module, with smaller components housed within larger structural frameworks. This nesting approach allows small micro-LEDs to be protected and positioned within robust module containers, facilitating easier transfer and mounting of the entire assembled unit rather than handling individual microscopic devices.
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
The solution effectively increases the intensity of red light emission while minimizing the number of micro-LEDs, improving the efficiency and density of micro-LED displays.
Implementation Method 1
a first light emitting structure, and the second light emitting device includes a second light emitting structure and a third light emitting structure, the first light emitting structure emitting light having a longer peak wavelength than peak wavelengths of light emitted from the second and third light emitting structures, the second and third light emitting structures emitting light having different peak wavelengths
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A pixel device includes a first light emitting device; a second light emitting device horizontally disposed adjacent to the first light emitting device; a first cover layer covering the first light emitting device and the second light emitting device; and connection layers disposed on the first cover layer and electrically connected to the first and second light emitting devices, wherein the first light emitting device includes a first light emitting structure, and the second light emitting device includes a second light emitting structure and a third light emitting structure, the first light emitting structure emitting light having a longer peak wavelength than peak wavelengths of light emitted from the second and third light emitting structures, the second and third light emitting structures emitting light having different peak wavelengths.