Hybrid LED OLED Illumination Source for Color Rendering
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Solution Overview
Problem
Current illumination technologies face challenges in achieving high efficiency and long lifetime for blue light emission using organic light emitting devices (OLEDs), while inorganic LEDs are efficient but limited in green light emission, leading to suboptimal color rendering index and correlated color temperature in lighting applications.
Innovation Solution
A combination of inorganic LEDs and OLEDs is used, where inorganic LEDs emit blue light and OLEDs emit green and red light, with a driving component to control current and maintain desired color characteristics, integrated with an optical waveguide structure for uniform light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If OLEDs are used for blue light emission, then flexibility and material cost advantages are achieved, but efficiency and lifetime are insufficient
Solution Approach 1:
The patent combines OLED and LED technologies into a hybrid illumination device. The OLED component provides blue light with flexibility and cost advantages, while the LED component compensates for the insufficient lifetime and efficiency of OLEDs in the blue region, achieving a synergistic effect that resolves the contradiction between ease of manufacture and reliability.
Solution Approach 2:
The illumination device uses a composite structure integrating organic light-emitting materials (OLED) and inorganic light-emitting materials (LED). This composite approach allows the device to leverage the advantages of both material systems - the flexibility and tunability of organic materials and the high efficiency and longevity of inorganic materials.
2Reliability
If inorganic LEDs are used for blue light emission, then efficiency and lifetime are improved, but color rendering index and correlated color temperature are suboptimal
Solution Approach 1:
The patent merges LED and OLED light sources in a single illumination device. The LED provides efficient blue light with long lifetime, while the OLED emits green and red light to complement the spectrum, thereby improving the overall color rendering index and correlated color temperature while maintaining the efficiency and lifetime advantages of LEDs.
Solution Approach 2:
The illumination device employs different light-emitting technologies for different spectral regions. LEDs are used for the blue region where high efficiency and lifetime are critical, while OLEDs are used for the green and red regions where color rendering benefits are prioritized. This local optimization resolves the contradiction between reliability and illumination quality.
3Illumination intensity
If a combination of LEDs and OLEDs is used, then color rendering index and efficiency are enhanced, but device complexity increases
Solution Approach 1:
The patent integrates LED and OLED components into a unified illumination device with a shared control system and optical structure. By merging the two technologies in a coordinated manner rather than as separate systems, the device achieves enhanced color rendering and efficiency while minimizing the increase in complexity through integrated design.
4Ease of manufacture
If OLEDs are used alone, then flexibility and cost advantages are achieved, but operating efficiency is limited
Solution Approach 1:
The hybrid illumination device combines OLED and LED technologies, where the LED component provides high operating efficiency for blue light emission, compensating for the energy efficiency limitations of OLEDs. The OLED component maintains the flexibility and cost advantages, creating a balanced system that resolves the contradiction between ease of manufacture and operating efficiency.
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
This combination enhances the color rendering index and operating efficiency, achieving a longer lifetime and higher efficiency than either technology alone, with improved color consistency and uniform illumination.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Implementation Method 2
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Data Source
AI summary
A first device is provided, wherein the first device is an illumination source comprising OLEDs and inorganic LEDs. The first device includes a first light source that has one or more first light emitting devices. Each of the first light emitting devices includes an inorganic light emitting diode (LED) that emits light that has a peak wavelength in the visible spectrum between 400 and 500 nm. The device also includes a second light source that has one or more second light emitting devices. Each of the second light emitting devices comprises an organic light emitting diode (OLED) that emits light that has peak wavelength in the visible spectrum between 500 and 800 nm. The device also includes a driving component. The first light source and the second light source are disposed such that their emissions combine.