Light Emitting Device Partial Regions Homogenize Light Density
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Solution Overview
Problem
Radiation emitting devices suffer from non-homogeneous light density due to voltage drops along the lateral direction, resulting in uneven brightness across the surface.
Innovation Solution
Incorporating a layer sequence with varying distribution densities of partial regions that modify light emission, using insulating and non-transparent elements between electrode surfaces to regulate light density, and employing transparent conductive oxides to reduce conductivity and voltage drop, thereby achieving a more uniform light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large surface radiation emitting device is used, then the lighting coverage is improved, but the light density becomes non-homogeneous due to voltage drops along the lateral direction
Solution Approach 1:
The patent introduces partial regions with different optical properties (varying light density) into specific locations of the radiation emitting device. These partial regions are strategically positioned to compensate for voltage drop effects, creating local variations in light emission that overall homogenize the light density across the large surface area.
Solution Approach 2:
The patent modifies the light density parameter by introducing partial regions with different optical characteristics. By changing the optical parameters (transparency, light absorption) in specific regions, the overall light density distribution is adjusted to achieve uniformity across the large surface area.
2Illumination intensity
If the light density is increased in certain regions, then the brightness is improved, but the homogeneity of light distribution deteriorates
Solution Approach 1:
The patent creates partial regions with specific local optical qualities that differ from the surrounding areas. These regions are designed to have reduced light density and are positioned to balance out brightness variations, thereby maintaining overall homogeneity while allowing local brightness adjustments.
Solution Approach 2:
The patent introduces asymmetric distributions of partial regions with varying light densities to compensate for the symmetric voltage drop pattern. By creating controlled asymmetric light density variations, the overall light distribution achieves improved homogeneity across the device surface.
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 homogenizes light density across the radiation emitting device surface, reducing brightness differences to a maximum of 20% and providing a more uniform and aesthetically pleasing lighting effect.
Implementation Method 1
at least one functional layer (300) that emits radiation during operation
Implementation Method 2
employing transparent conductive oxides to reduce conductivity and voltage drop
Implementation Method 3
using insulating and non-transparent elements between electrode surfaces to regulate light density
Data Source
AI summary
A radiation emitting device includes a substrate and a layer sequence disposed on top of the substrate. The layer sequence includes a first electrode surface with a first contact for applying a voltage, at least one functional layer that emits radiation during operation, and a second electrode surface. In the layer sequence, a plurality of partial regions is present that is modified in such a way that the emission of radiation visible to an external observer therefrom is interrupted. The distribution density of these partial regions can vary depending on their distance from the contact.