OLED Shielding Lamella Structure for Glare Reduction
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Solution Overview
Problem
Organic light-emitting diodes (OLEDs) used for large area illumination suffer from glare due to their lambertian characteristic, which causes discomfort by directing artificial light in all directions, including towards observers.
Innovation Solution
A light emitting device with a shielding structure comprising macroscopic lamella elements connected to the basic layer, guiding artificial light out of the device to prevent glare and acting as a heat dissipator through high thermal conductivity connections, such as gluing or welding, to channelize light flux and reduce direct visibility of the light-emitting layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If OLED is used as large area illumination device with high light flux, then illumination intensity is improved, but glare occurs due to lambertian light distribution
Solution Approach 1:
The patent divides the light-emitting surface into multiple segments by adding a shielding structure with lamella elements. These elements segment the uniformly emitting OLED surface into multiple zones, redirecting light from different areas to achieve non-uniform angular distribution and reduce glare while maintaining overall illumination intensity.
Solution Approach 2:
The shielding structure acts as an intermediary element between the OLED light source and the observer. It intercepts and redirects the lambertian light distribution, transforming the direct glare-causing light paths into indirect illumination paths that reduce discomfort while preserving light flux.
2Object-affected harmful factors
If shielding structure is added to prevent glare, then glare is reduced, but device complexity increases
Solution Approach 1:
The shielding structure is designed to serve multiple functions simultaneously: it prevents glare by controlling light distribution, dissipates heat through thermally conductive connections to the substrate, and maintains mechanical stability. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent optimizes parameters of the shielding structure such as the geometry of lamella elements, their spacing, and thermal conductivity properties to achieve effective glare reduction with minimal structural complexity. By carefully selecting these parameters, the design achieves the desired optical performance without excessive complexity.
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 effectively channels light to illuminate specific areas without glare, providing efficient heat dissipation and ensuring that observers do not have a direct line of sight to the light-emitting layer, thus addressing the glare issue while maintaining high light intensity and efficiency.
Implementation Method 1
the lamella elements guide the artificial light out of the light emitting device
Implementation Method 2
acting as a heat dissipator through high thermal conductivity connections, such as gluing or welding
Data Source
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AI summary
The invention relates to a light emitting device (10), comprising a stack of layers (15) of a substrate, with a basic layer (20), a first electrode layer (30) and a second electrode layer (40), wherein an organic light-emitting layer (50) is sandwiched between the first (30) and the second electrode layer (40), the organic light-emitting layer (50) is emitting an artificial light (51). The invention discloses that at least a part of the basic layer (20) is covered by a shielding structure (60), wherein the shielding structure (60) comprises a plurality of lamella elements (70,70'), the lamella elements (70,70') extend sheet like from the stack of layers (15) in such a way, that the lamella elements (70,70') guide the artificial light (51) out of the light emitting device (10).