OLED Luminaire With Laterally Spaced RGB Pixels
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Solution Overview
Problem
There is a need for new OLED structures and processes for making them suitable for lighting applications, as existing technologies lack efficient methods for producing white light-emitting diodes with high color rendering and low power consumption.
Innovation Solution
An OLED luminaire is designed with a patterned first electrode, a second electrode, and a light-emitting layer comprising pixels of blue, green, and red-orange electroluminescent materials, arranged laterally to achieve white light emission through additive mixing, along with a process involving substrate preparation, deposition of electroluminescent materials in pixellated patterns, and drying to form the pixelated structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional OLED structures are used for lighting applications, then device simplicity is maintained, but color rendering quality and power consumption efficiency are insufficient
Solution Approach 1:
The light-emitting layer is segmented into multiple distinct electroluminescent materials, each responsible for emitting a specific color (blue, green, red-orange). This segmentation allows each material to be optimized for its specific emission wavelength, achieving high color rendering quality while maintaining manageable device complexity through functional division.
Solution Approach 2:
Different regions of the light-emitting layer are assigned different electroluminescent materials with specific emission characteristics (blue, green, red-orange). This local quality assignment enables precise control over the spectral composition of the emitted light, achieving superior color rendering by tailoring the emission properties of each local region.
2Illumination intensity
If multiple electroluminescent materials are used to achieve white light emission, then color rendering index is improved, but manufacturing complexity increases
Solution Approach 1:
The patent transitions from vertical stacking of electroluminescent layers to a lateral arrangement where blue, green, and red-orange emitting materials are positioned side-by-side within the same light-emitting layer. This dimensional change simplifies manufacturing by eliminating the need for multiple precise layer deposition steps while maintaining the ability to produce high-quality white light through additive color mixing.
3Use of energy by moving object
If conventional lighting technologies are used, then manufacturing processes are simple, but power consumption is high and light quality is poor
Solution Approach 1:
The patent changes the fundamental parameters of the light-emitting layer by incorporating multiple electroluminescent materials with different emission characteristics. This parameter change enables the OLED to achieve high color rendering index and tunable brightness while maintaining low power consumption, as OLED technology inherently operates more efficiently than conventional lighting solutions.
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 enables the production of OLEDs with high color rendering index and low power consumption, offering improved light quality and tunable brightness, while simplifying the manufacturing process and reducing material waste.
Implementation Method 1
The organic active layer emits light through the light-transmitting electrode upon application of electricity across the electrodes
Implementation Method 2
drying the deposited compositions to form pluralities of pixels
Data Source
AI summary
There is provided an organic light-emitting diode luminaire. The luminaire includes a patterned first electrode, a second electrode, and a light-emitting layer therebetween. The light-emitting layer includes a first plurality of pixels having an emission color that is blue; a second plurality of pixels having an emission color that is green, the second plurality of pixels being laterally spaced from the first plurality of pixels; and a third plurality of pixels having an emission color that is red-orange, the third plurality of pixels being laterally spaced from the first and second pluralities of pixels. The additive mixing of all the emitted colors results in an overall emission of white light.