Microlens Layout for Micro-LED Luminance and Viewing Angle
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Solution Overview
Problem
Display devices with micro-sized light-emitting diodes face challenges in achieving uniform luminance distribution and high viewing angles, with existing technologies potentially complicating the transfer process of light-emitting elements and resulting in varying luminance across different viewing directions.
Innovation Solution
The display device incorporates a substrate with a combination of first and second light-emitting elements, each overlapped by lenses of different diameters to optimize luminance and viewing angle, with larger lenses in the center region enhancing front-direction luminance and smaller lenses in peripheral regions improving viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light-emitting elements are mounted on array substrate in an inclined manner, then distribution of output light in display region is changed, but the process of transferring light-emitting elements becomes complicated
Solution Approach 1:
The patent maintains elements in a planar arrangement (avoiding inclined mounting complexity) while achieving different light distributions by implementing local quality differences in the microlens characteristics. Specifically, microlenses in different regions have different focal lengths to achieve the desired light distribution pattern without complicating the element transfer process.
2Adaptability or versatility
If uniform luminance distribution is achieved across display region, then viewing angle is improved, but luminance in front direction may be reduced
Solution Approach 1:
The patent resolves this contradiction by applying local quality differentiation: central pixels use microlenses with shorter focal lengths to maintain high front-direction luminance, while peripheral pixels use microlenses with longer focal lengths to widen the emission angle and improve viewing characteristics. This regional optimization achieves both high front luminance and wide viewing angle simultaneously.
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
This configuration achieves enhanced luminance in the front direction while maintaining high viewing angles, providing a balanced light distribution across the display region.
Implementation Method 1
a first microlens overlapping each of the first light-emitting elements and having a first diameter in planar view seen from a direction perpendicular to the array substrate, and a second microlens overlapping each of the second light-emitting elements and having a second diameter smaller than the first diameter
Data Source
AI summary
A display device includes a substrate, a plurality of first light-emitting elements and a plurality of second light-emitting elements provided in a display region of the substrate, a first lens provided overlapping each of the first light-emitting elements and having a first diameter in planar view seen from a direction perpendicular to the substrate, and a second lens provided overlapping each of the second light-emitting elements and having a second diameter smaller than the first diameter in planar view seen from the direction perpendicular to the substrate.