Micro LED Unit Pixel Reflector Layout for Luminance Uniformity
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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 uniformity of light emission.
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 light extraction and uniformity, is used to address these issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If micro LEDs are arranged densely on a two-dimensional plane to achieve high resolution, then the number of pixels increases, but light extraction efficiency decreases and luminance uniformity deteriorates
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement to a three-dimensional stacked structure. Multiple micro LED layers are arranged vertically with alternating orientations, allowing light to be extracted through both top and bottom surfaces. This vertical stacking enables higher pixel density while maintaining light extraction efficiency through multi-directional emission.
Solution Approach 2:
The display structure is segmented into multiple independent micro LED layers, each emitting light in specific directions. By dividing the light emission into multiple spatial paths (top surface, bottom surface, side surfaces), the system achieves better luminance distribution and prevents light trapping that occurs in dense single-layer configurations.
2Quantity of substance
If micro LED size is reduced to increase pixel density, then resolution improves, but light emission efficiency decreases
Solution Approach 1:
By arranging micro LEDs in multiple vertical layers with alternating orientations, the patent creates additional light extraction paths. Smaller micro LEDs in each layer contribute to high pixel density, while the multi-layer structure ensures that light from each small LED can escape through multiple surfaces, compensating for the reduced size and maintaining overall emission efficiency.
Solution Approach 2:
The micro LEDs are pre-arranged in specific alternating orientations within each layer before assembly. This preliminary structural configuration ensures optimal light extraction geometry is established in advance, allowing small micro LEDs to maximize their light emission efficiency through the designed multi-directional extraction paths.
3Ease of manufacture
If light emitting devices are arranged in a single layer, then manufacturing is simpler, but viewing angle control is limited
Solution Approach 1:
The patent adds the vertical dimension by stacking multiple micro LED layers with alternating orientations. This three-dimensional arrangement provides superior viewing angle control compared to single-layer structures, as light can be emitted and viewed from multiple directions (top, bottom, sides) while maintaining manufacturability through standardized layer assembly processes.
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 uniform viewing angles by optimizing light propagation and adhesion, improving the overall performance of 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.