Micro LED Unit Pixel Substrate for Uniform RGB Viewing Angles
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Solution Overview
Problem
Conventional micro LED displays face challenges in achieving uniform viewing angles for light emitted from sub-pixels, leading to color variations when viewed from different angles due to differing viewing angles of red, green, and blue light, which affects the quality of displayed images.
Innovation Solution
A unit pixel design featuring a transparent substrate with a concavo-convex pattern on its surface, where light emitting devices are arranged with an optical layer in between, enhancing light extraction efficiency and setting uniform viewing angles by reducing total internal reflection and optimizing light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional micro LED displays are used with flat substrates, then the structure is simple and manufacturing is easier, but the viewing angles of light from different sub-pixels are non-uniform causing color variations
Solution Approach 1:
The patent applies curvature by forming a concavo-convex pattern on the transparent substrate surface. This curved surface structure modifies the optical path of light from LED sub-pixels, enabling uniform viewing angles across different colors (red, green, blue) without requiring complex additional optical components for each sub-pixel
Solution Approach 2:
The patent implements local quality by creating localized concave and convex regions on the substrate surface corresponding to different LED sub-pixel positions. Each local region's curvature is optimized to control the viewing angle of light from its associated LED, achieving uniform color output across the entire display while maintaining a relatively simple overall substrate structure
2Productivity
If light emitting devices are arranged closely to increase pixel density, then productivity and resolution improve, but total internal reflection increases reducing light extraction efficiency
Solution Approach 1:
The concavo-convex pattern creates curved interfaces that reduce total internal reflection between the substrate and surrounding medium. This curvature allows light from closely spaced LED sub-pixels to be extracted more efficiently, enabling high pixel density while minimizing energy loss from internal reflection
Solution Approach 2:
The concavo-convex pattern effectively creates a porous-like surface structure with multiple interfaces. This structure increases the probability of light extraction by providing multiple escape paths for photons, thereby improving light extraction efficiency even when LEDs are densely packed
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 ensures substantially uniform viewing angles for light emitted from the unit pixels, reducing color differences when viewed from various angles and improving the overall image quality by maintaining consistent color representation across different viewing positions.
Implementation Method 1
enhancing light extraction efficiency and setting uniform viewing angles by reducing total internal reflection
Implementation Method 2
an optical layer disposed between the light emitting devices and the transparent substrate, and transmitting light emitted from the light emitting devices
Data Source
AI summary
A unit pixel includes a transparent substrate, a plurality of light emitting devices arranged on the transparent substrate, and an optical layer disposed between the light emitting devices and the transparent substrate and transmitting light emitted from the light emitting devices. The transparent substrate has a concavo-convex pattern on a surface facing the light emitting devices.