OLED Light-Emitting System with Inclined Microprisms
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic light-emitting diodes (OLEDs) with a microcavity structure face challenges in maintaining consistent luminous intensity when inclined from their standard direction, leading to uneven light distribution.
Innovation Solution
A light-emitting system with a resonator and organic layer configuration that directs light emission to have a maximum value in a direction different from the standard direction, utilizing a specific layer structure and phase shift amounts to ensure consistent luminous intensity across various angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an OLED with microcavity structure is used to achieve high luminous intensity, then the luminous intensity in the standard direction is improved, but the luminous intensity becomes remarkably changed when the OLED is inclined from the standard direction
Solution Approach 1:
The patent introduces asymmetric structural elements including a scattering member with specific scattering characteristics and a microprism array where prisms are inclined at angles different from the normal direction. This asymmetric configuration redirects light paths to compensate for the angular shift caused by OLED inclination, thereby maintaining consistent luminous intensity distribution across different viewing angles.
Solution Approach 2:
The patent adds spatial dimensionality by incorporating a microprism array where prisms are inclined at specific angles (e.g., 10-45 degrees) relative to the normal direction of the OLED. This three-dimensional structural arrangement creates additional light redirection paths that counteract the angular dependence issue, allowing the light distribution maximum to remain in the standard direction even when the OLED is inclined.
2Adaptability or versatility
If a scattering member is added to widen the emitting range of light, then the light distribution in surrounding directions is improved, but the light distribution becomes uneven when the OLED is inclined
Solution Approach 1:
The patent combines the scattering member with asymmetrically inclined microprisms that have different inclination angles. This asymmetric configuration ensures that light scattered in various directions is systematically redirected, maintaining uniform light distribution characteristics even when the OLED is inclined from the standard direction. The asymmetric prism arrangement compensates for the directional bias introduced by OLED inclination.
Solution Approach 2:
The patent employs microprisms with curved or inclined surfaces rather than simple planar structures. The curved surfaces of the microprisms create multiple refraction and reflection paths that evenly distribute light across different angles, preventing uneven light distribution when the OLED is inclined while still widening the overall emitting range.
3Illumination intensity
If the light distribution maximum is in the reference direction (thickness direction), then the luminous intensity is maximized in the standard direction, but the luminous intensity changes remarkably when inclined from the standard direction
Solution Approach 1:
The patent introduces asymmetric microprism structures with inclination angles (e.g., 10-45 degrees) that are specifically designed to counteract the angular shift caused by OLED inclination. When the OLED is inclined, these asymmetric prisms redirect light paths to compensate for the deviation, ensuring that the light distribution maximum remains in the standard direction and luminous intensity consistency is maintained across different operating conditions.
Solution Approach 2:
The patent creates a dynamic light redirection system where the microprism array adapts to different OLED inclination angles. The inclined prisms provide dynamic compensation by redirecting light at varying angles depending on the OLED's orientation, thereby maintaining stable luminous intensity characteristics whether the OLED is in the standard position or inclined at various angles.
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 a consistent and enhanced light distribution with higher luminous intensity in desired directions, even when the OLED is inclined, by optimizing the layer thickness and phase shifts within the resonator, thereby maintaining luminous intensity and chromaticity across different angles.
Implementation Method 1
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
Implementation Method 2
The OLED described in Patent Document 2 includes a scattering member which scatters light emitted by the microcavity structure
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). A light distribution of light from a light-emitting region (242) (more specifically, a light-emitting unit (172)) has a maximum value in a first direction (D1). The first direction (D1) is different from the standard direction (S). Specifically, an angle formed between the first direction (D1) and the reference direction (R) is greater than an angle formed between the standard direction (S) and the reference direction (R).