Stacked Micro LED Pixel Structure for Red Brightness Balance
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Solution Overview
Problem
Micro LED displays face challenges in maintaining high luminous intensity, particularly for red light, due to the small size of micro LEDs and difficulties in transferring them to circuit boards, leading to reduced efficiency and increased costs.
Innovation Solution
A pixel device design featuring a first light emitting device emitting red light and second and third light emitting devices emitting green and blue light, respectively, with a stacked structure and adhesive layers to enhance light emission efficiency, and a display apparatus incorporating these pixel devices on a circuit board to improve luminous intensity and reduce the number of micro LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If micro LEDs are arranged on a plane for each sub-pixel, then the display can show various colors, but the number of micro LEDs becomes very large and transfer to circuit board becomes difficult
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement of micro LEDs to a three-dimensional stacked structure. Multiple light emitting devices are vertically stacked to form a single pixel module, reducing the number of devices needed on the circuit board while maintaining full-color display capability through the combination of stacked devices.
Solution Approach 2:
The patent combines multiple light emitting devices (red, green, blue) into a single stacked pixel module. This merging approach allows multiple functions (emitting different colors) to be integrated into one compact structure, reducing the total number of separate micro LEDs required for the display.
2Device complexity
If a pixel module with vertically stacked blue, green, and red light emitting devices is used, then the number of micro LEDs is reduced, but the luminous intensity of red light becomes relatively low
Solution Approach 1:
The patent applies different structural characteristics to different light emitting devices within the stacked module. Specifically, the red light emitting device is designed with a larger active area or optimized structure compared to green and blue devices, compensating for its inherently lower luminous intensity and achieving balanced overall output across all colors.
3Manufacturing precision
If micro LEDs are made extremely small (200 μm or less, further 100 μm or less), then the display resolution is improved, but transfer to circuit board becomes increasingly difficult
Solution Approach 1:
The patent moves the assembly process to the vertical dimension by stacking multiple light emitting devices vertically before transferring to the circuit board. This approach allows larger, easier-to-handle devices to be stacked and then transferred as a single module, avoiding the difficulty of transferring extremely small individual micro LEDs while maintaining high display resolution.
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 luminous intensity of red light while reducing the number of micro LEDs, enhancing display efficiency and reducing manufacturing complexities, thereby improving the overall performance and cost-effectiveness of micro LED displays.
Implementation Method 1
Light emitting device are semiconductor devices using a light emitting diode which is an inorganic light source
Implementation Method 2
a first light emitting structure, and the second light emitting device includes a second light emitting structure and a third light emitting structure, in which the first light emitting structure emits light having a peak wavelength longer than peak wavelengths of light emitted from the second and third light emitting structures
Data Source
AI summary
A pixel device including a first light emitting device; a second light emitting device disposed laterally 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, in which 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, in which the first light emitting structure emits light having a peak wavelength longer than peak wavelengths of light emitted from the second and third light emitting structures, and the second and third light emitting structures emit light having different peak wavelengths from each other.