OLED Microcavity Asymmetric Light Distribution
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Solution Overview
Problem
OLEDs with a microcavity structure face challenges in maintaining chromaticity consistency when inclined from a standard direction, leading to differences in light emission characteristics on either side of the standard direction.
Innovation Solution
A light-emitting system with a resonator structure, where the organic layer is positioned between the reflecting and semi-transparent reflecting layers, is designed to enhance luminous intensity and chromaticity in the standard direction while minimizing differences in chromaticity when inclined, by optimizing the thickness and refractive indices of the layers to achieve symmetric light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a microcavity structure is used in OLEDs to enhance light emission, then luminous intensity is improved, but chromaticity consistency deteriorates when the device is inclined from the standard direction
Solution Approach 1:
The patent applies asymmetry by intentionally designing the light-emitting unit with asymmetric light distribution characteristics. The microcavity structure is configured to produce asymmetric emission patterns where light intensity varies with viewing angle, creating higher luminous intensity in the standard direction while accepting chromaticity variations in inclined directions. This asymmetric design resolves the contradiction by prioritizing forward emission efficiency over omnidirectional chromaticity uniformity.
Solution Approach 2:
The patent employs parameter changes by optimizing the microcavity dimensions, layer thicknesses, and refractive indices to control the resonance conditions. By adjusting these parameters, the system achieves enhanced luminous intensity through constructive interference in the standard direction while managing chromaticity shifts in inclined directions through careful tuning of the optical path lengths and cavity resonances.
2Reliability
If the microcavity structure is optimized for standard direction emission, then chromaticity in the standard direction is improved, but light distribution symmetry deteriorates
Solution Approach 1:
The patent applies dynamics by designing the light-emitting unit to adapt its emission characteristics based on viewing angle. The system dynamically optimizes performance for the standard direction through the microcavity resonance, while accepting different emission patterns in inclined directions. This dynamic behavior allows the system to maintain high chromaticity quality in the standard direction while managing symmetry through angular-dependent emission control.
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 system achieves higher luminous intensity and consistent chromaticity in the standard direction, even when inclined, by carefully designing the light distribution to have maximum values in symmetric directions, thereby reducing chromaticity differences and enhancing light emission efficiency.
Implementation Method 1
The organic layer is between the reflecting layer and the semi-transparent reflecting layer and emits light
Implementation Method 2
The light from the organic layer is reflected between the reflecting layer and the semi-transparent reflecting layer and emitted from the semi-transparent reflecting layer side
Data Source
AI summary
A standard direction (S) is a horizontal direction (a direction along X direction in the drawing). A base material (200) is supported by a frame body (250) so that a second surface (204) of the base material (200) is oriented obliquely upward from the standard direction (S). Thereby, a reference direction (R) is oriented obliquely upward from the standard direction (S). Light from the light-emitting system (20) has standard chromaticity in the standard direction (S). In addition, the light from the light-emitting system (20) has first chromaticity and second chromaticity in a first side direction (S1) and a second side direction (S2), respectively, the first side direction (S1) and the second side direction (S2) being symmetric with respect to the standard direction (S). A difference between the first chromaticity and the standard chromaticity is smaller than a difference between the second chromaticity and the standard chromaticity.