Display Device Light Control Layer Wavelength Management
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Solution Overview
Problem
Current display devices with self-luminescence elements face challenges in achieving long lifespan and high efficiency due to limitations in light control and energy transfer mechanisms.
Innovation Solution
A display device incorporating a luminescence element layer and a light control layer with specific light control parts that absorb and emit light across different wavelength ranges, utilizing luminescence materials and auxiliary materials to enhance energy transfer and light conversion efficiency, including a structure with a first light control part emitting blue light, a second part transmitting green light, and a third part emitting red light, each optimized for specific energy levels and materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single luminescence element layer emits all colors, then device structure is simple, but light conversion efficiency and lifespan are limited
Solution Approach 1:
The display device divides the luminescence element layer into multiple separate luminescence elements (first, second, and third luminescence elements) that emit different colors (blue, green, red). Each luminescence element can be optimized for its specific wavelength range, improving overall reliability and lifespan while maintaining reasonable structural complexity through the shared electrode and substrate architecture.
2Device complexity
If luminescence materials convert light across wide wavelength ranges, then fewer materials are needed, but energy transfer efficiency decreases
Solution Approach 1:
Each luminescence element uses luminescence materials with energy levels specifically optimized for its designated color range. The first luminescence element uses materials with energy levels suitable for blue light emission, the second for green, and the third for red. This localized optimization of material properties ensures high energy transfer efficiency within each element while achieving full-color display capability.
3Illumination intensity
If luminescence materials have high energy levels to emit shorter wavelengths, then blue light emission is achieved, but device lifespan decreases due to higher energy degradation
Solution Approach 1:
The device separates blue light emission into a dedicated first luminescence element with materials optimized for high-energy blue emission, while the second and third elements handle lower-energy green and red emissions. This segmentation allows the blue-emitting element to use the most appropriate high-energy materials while the other elements can focus on longevity, and the shared electrode and substrate provide overall structural stability.
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 achieves improved light conversion efficiency and extended lifespan by effectively managing light emission across different colors, enhancing the overall performance and longevity of the display device.
Implementation Method 1
The luminescence auxiliary material may be to absorb the first color light, to be excited, and to transfer energy to the first luminescence material
Implementation Method 2
The luminescence auxiliary material may be to absorb the first color light, to be excited, and to transfer energy to the first luminescence material
Implementation Method 3
The first luminescence material may be a fluorescence material
Implementation Method 4
The emission layer may be to emit phosphorescent light
Implementation Method 5
holes and electrons injected from a first electrode and a second electrode, respectively, recombine in an emission layer, where an organic material or an inorganic material contained in the emission layer is configured to emit light
Data Source
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AI summary
A display device includes a luminescence element layer to emit a first color light, and a light control layer on the luminescence element layer. The light control layer includes a first light control part including a first luminescence material to emit a second color light in a shorter wavelength range than the first color light, a second light control part to transmit the first color light, and a third light control part including a second luminescence material to emit a third color light in a longer wavelength range than the first color light, and accordingly, a long life-time of the display device may be achieved.