Transparent Unit Pixel Reflector Structure for Micro LED Viewing Angles
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Solution Overview
Problem
Micro LED displays face challenges in maintaining luminance and controlling viewing angles due to the small size of micro LEDs, which affects the efficiency and quality of image representation.
Innovation Solution
A unit pixel design featuring a transparent substrate with light emitting devices and a reflector that directs light through both surfaces, along with a light blocking layer and adhesive layer, to enhance luminance and viewing angles, and a step adjustment layer for electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If micro LEDs are arranged densely on a two-dimensional plane to achieve high-resolution display, then the number of pixels increases, but the handling and mounting difficulty increases significantly
Solution Approach 1:
The patent transitions from arranging micro LEDs on a two-dimensional plane to a three-dimensional structure by placing multiple micro LEDs at different heights (first, second, and third heights) above the substrate. This vertical arrangement enables high pixel density while simplifying handling through group mounting operations.
Solution Approach 2:
The patent divides the micro LED array into multiple groups, each group containing micro LEDs at different heights. This segmentation allows independent handling and mounting of each group, reducing the complexity of managing individually tiny micro LEDs while achieving high overall pixel density.
2Device complexity
If conventional light emitting diodes are used as backlight light sources, then the structure is simple, but the response speed is slow and power consumption is high
Solution Approach 1:
The patent replaces conventional backlight LED systems with a direct-view micro LED display structure where micro LEDs are directly mounted on the display panel substrate. This substitution eliminates the need for complex backlight units and achieves faster response speeds while maintaining structural efficiency.
3Manufacturing precision
If micro LEDs are made extremely small (200 μm or less, further 100 μm or less) to increase pixel density, then the resolution improves, but the luminance decreases
Solution Approach 1:
The patent compensates for the reduced luminance of individual tiny micro LEDs by arranging multiple micro LEDs at different vertical heights. This three-dimensional arrangement increases the total light output area and improves overall luminance while maintaining the small pixel size for high resolution.
Solution Approach 2:
The patent uses a composite structure combining multiple micro LEDs at different heights with transparent adhesives and reflective layers. This composite arrangement maximizes light extraction efficiency and overall luminance output from the collection of small micro LEDs, compensating for the low luminance of individual devices.
4Illumination intensity
If multiple micro LEDs are arranged in a three-dimensional structure at different heights, then the luminance and viewing angle improve, but the device complexity increases
Solution Approach 1:
The patent employs transparent adhesives that serve multiple functions: bonding micro LEDs to the substrate, positioning them at precise heights, and acting as optical elements for light extraction. This multi-functionality reduces the need for additional structural components, simplifying the overall device despite the three-dimensional micro LED arrangement.
Solution Approach 2:
The patent uses the adhesive material itself to provide both mechanical bonding and optical functions. The adhesive's refractive index and transparency properties are utilized to enhance light extraction, eliminating the need for separate optical elements and reducing structural complexity while maintaining improved luminance.
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 luminance and uniformity of viewing angles, preventing color differences and improving the overall image quality in micro LED displays.
Implementation Method 1
the reflector is configured to reflect light proceeding to the upper surface of the transparent substrate from the inside of the transparent substrate
Data Source
AI summary
A unit pixel includes a transparent substrate having an upper surface and a lower surface, a plurality of light emitting devices arranged over the upper surface of the transparent substrate, and a reflector disposed between the light emitting devices and the transparent substrate. Light emitted from the light emitting devices is configured to exit to the outside through the upper and lower surfaces of the transparent substrate, and the reflector is configured to reflect light proceeding to the upper surface of the transparent substrate from the inside of the transparent substrate.