Micro-LED Pixel Structure With Bragg Reflector for Color Angle Stability
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Solution Overview
Problem
Micro-LED displays face challenges in transferring large numbers of small LEDs to a circuit board due to their small form factor, and color tone changes occur depending on viewing angles due to differing radiation patterns of blue, green, and red light.
Innovation Solution
A light emitting device with a substrate featuring a protruding pattern, multiple sub-units with LED stacks emitting different wavelengths, and insulation layers including a distributed Bragg reflector to enhance light extraction and reduce angle-dependent color tone changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If micro LEDs are made with very small size (200 μm or less, further 100 μm or less), then the display resolution and pixel density are improved, but the difficulty of transferring large number of micro LEDs to circuit board increases
Solution Approach 1:
The invention divides the micro LED array into modular units with standardized mounting structures. Each micro LED is integrated with bonding pads and connection structures that enable batch transfer and mounting, transforming the transfer process from handling individual tiny LEDs to managing structured modules that are easier to manipulate and position accurately on circuit boards.
2Device complexity
If conventional light emitting devices are used as backlight units, then the device structure is simple, but the response speed and power consumption performance are insufficient
Solution Approach 1:
The invention replaces conventional backlight units with micro LED direct display devices, transitioning from indirect illumination through liquid crystal modulation to direct light emission from semiconductor LEDs. This substitution enables significantly faster response speeds and improved power consumption characteristics while maintaining manageable device complexity through integrated pixel structures.
3Adaptability or versatility
If blue, green, and red light emitting sub-units are arranged to form pixels, then various colors can be displayed, but color tone changes occur depending on viewing angle due to different radiation patterns
Solution Approach 1:
The invention applies different radiation control structures to different wavelength sub-units (blue, green, red LEDs) within each pixel. By tailoring the optical characteristics of each sub-unit with wavelength-specific radiation patterns and extraction structures, the device achieves consistent color emission across viewing angles while maintaining full-color display capability.
Solution Approach 2:
The invention modifies the radiation parameters (emission angle, intensity distribution) of each LED sub-unit through structural design elements such as lens shapes, reflective surfaces, and extraction patterns. By adjusting these optical parameters for each wavelength component, the device achieves uniform color perception across different viewing angles while preserving the ability to display various colors.
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 improves light extraction efficiency and reduces color tone variations by aligning radiation patterns, ensuring consistent color representation across viewing angles.
Implementation Method 1
at least one of the first insulation layer and the second insulation layer includes a distributed Bragg reflector
Data Source
AI summary
A light emitting device including a substrate having a protruding pattern on an upper surface thereof, a first sub-unit disposed on the substrate, a second sub-unit disposed between the substrate and the first sub-unit, a third sub-unit disposed between the substrate and the second sub-unit, a first insulation layer at least partially in contact with side surfaces of the first, second, and third sub-units, and a second insulation layer at least partially overlapping with the first insulation layer, in which at least one of the first insulation layer and the second insulation layer includes a distributed Bragg reflector.