Organic Electroluminescent Element with Dynamic Color Temperature
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Solution Overview
Problem
Existing organic electroluminescent elements do not effectively adjust luminance to provide comfortable lighting across varying environments, leading to increased material and development costs due to the need for multiple product types and user selection challenges.
Innovation Solution
An organic electroluminescent element with a color temperature that increases with luminance, within the range of 100 cd/m2 to 6000 cd/m2, ensuring comfortable lighting by maintaining a color temperature difference of 500 K or more, and emitting light within a white range defined by JIS Z9112, achieved through a multi-unit structure with blue, green, and red light emitting layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple types of organic electroluminescent elements are designed to meet different lighting purposes, then lighting comfort across varying environments is improved, but material cost, development cost, and production complexity increase
Solution Approach 1:
The patent applies universality by designing a single organic electroluminescent element that can provide comfortable lighting across varying luminance levels (100-6000 cd/m2) without requiring multiple product types. The element achieves this by incorporating multiple light emitting units with different emission characteristics that work together to maintain appropriate color temperature relationships across the full luminance range, eliminating the need for users to select from multiple specialized products.
Solution Approach 2:
The patent applies dynamics by enabling the light emitting units to dynamically adjust their relative contribution based on the operating luminance level. At different luminance levels, different units become dominant, allowing the element to adapt its color temperature characteristics automatically. This dynamic behavior enables a single element to replace multiple static products designed for specific luminance ranges.
2Ease of manufacture
If a single type of organic electroluminescent element is used across all luminance levels, then production cost is reduced, but lighting comfort varies at different luminance levels
Solution Approach 1:
The patent applies segmentation by dividing the light emitting structure into multiple distinct light emitting units, each optimized for different luminance ranges. The first light emitting unit (with first and second light emitting layers) and the second light emitting unit (with third light emitting layer) are segmented to operate at different luminance levels, with their relative outputs dynamically adjusted to maintain lighting comfort across the full 100-6000 cd/m2 range.
Solution Approach 2:
The patent applies composite materials by combining multiple light emitting layers with different emission characteristics within a single element. The first light emitting layer emits light with a first color temperature, the second light emitting layer emits light with a second color temperature, and these are composite together to achieve the desired color temperature relationship across varying luminance levels, enabling cost-effective mass production of a universal element.
3Device complexity
If the color temperature of emitted light remains constant across luminance changes, then product design is simplified, but user comfort decreases when luminance is adjusted
Solution Approach 1:
The patent applies parameter changes by intentionally designing the element so that the color temperature of emitted light changes with luminance level. Specifically, the color temperature increases as luminance increases from 100 to 6000 cd/m2, with the ratio between the first color temperature (at lower luminance) and second color temperature (at higher luminance) being controlled to fall within 0.8 to 1.2. This parameter change approach maintains user comfort across luminance adjustments while keeping the element design unified.
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 allows for comfortable lighting across different luminance levels without changing product types, reducing production costs and user selection complexity, while maintaining workability and natural color perception.
Implementation Method 1
a blue region light emitting layer designed to emit blue light and a first green region light emitting layer designed to emit green light via fluorescence
Implementation Method 2
a red region light emitting layer designed to emit red light and a second green region light emitting layer designed to emit green light via phosphorescence
Data Source
AI summary
The objective of the present invention is to propose an organic electroluminescent element capable of realizing lighting with which a person feels comfortable irrespective of change in luminance of emitted light. The organic electroluminescent element according to the present invention is constituted by a plurality of layers stacked. The organic electroluminescent element has such characteristics that, in a range of 100 cd/m2 to 6000 cd/m2 inclusive, a color temperature of emitted light increases with an increase in luminance of the emitted light in a direction identical to a direction in which the plurality of layers are stacked.