Light-Emitting Device With Shifted Microlenses for Optical Efficiency
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Solution Overview
Problem
Existing light emitting devices, particularly those using organic EL elements, suffer from insufficient light utilization efficiency when combined with optical systems, leading to increased power consumption.
Innovation Solution
The configuration of the light emitting device involves disposing microlenses shifted from the light-emission regions to improve light intensity in specific directions, utilizing a microlens shift amount to enhance light utilization efficiency in both front and oblique directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If microlenses are disposed on organic EL elements to increase emission intensity in the front direction, then emission intensity is improved, but light utilization efficiency when combined with optical systems is insufficient
Solution Approach 1:
The patent applies local quality by differentiating the microlens arrangement across different regions of the light emitting device. Specifically, microlenses are disposed with different shift amounts from the light-emitting regions depending on the viewing direction: larger shift amounts for front-viewing microlenses and smaller shift amounts for oblique-viewing microlenses. This regional differentiation optimizes light extraction efficiency for each specific viewing angle, thereby improving overall light utilization efficiency when combined with optical systems while maintaining high emission intensity.
2Illumination intensity
If microlenses are arranged to concentrate light, then emission intensity in specific directions is increased, but power consumption increases due to insufficient light utilization efficiency
Solution Approach 1:
The patent applies parameter changes by systematically varying the shift amount parameter of microlenses from light-emitting regions based on viewing direction. Front-viewing microlenses have larger shift amounts while oblique-viewing microlenses have smaller shift amounts. This parameter optimization ensures that light is concentrated in the desired directions with minimal loss, thereby improving power consumption efficiency while maintaining high emission intensity in specific directions.
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 increases emission intensity in desired directions, thereby improving light utilization efficiency in optical systems, reducing power consumption.
Implementation Method 1
a microlens that light from a light-emission region of the light emitting element enters
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3B
AI summary
A light emitting device is provided that includes a first light emitting element, a second light emitting element, and a third light emitting element; a first lens that overlaps a center of a first light-emission region of the first light emitting element; a second lens that overlaps a center of a second light-emission region of the second light emitting element; and a third lens that overlaps a center of a third light-emission region of the third light emitting element. A first pixel including the first light emitting element, a second pixel including the second light emitting element, and a third pixel including the third light emitting element each emit light of a first color. In the pixels that each emit the light of the first color, the second light emitting element is disposed between the first light emitting element and the third light emitting element and is adjacent to the first light emitting element and adjacent to the third light emitting element. A distance between a center of the second light-emission region and a vertex of the second lens is larger than a difference between a distance between a vertex of the first lens and the vertex of the second lens and a distance between the vertex of the second lens and a vertex of the third lens.