Dichroic Fluorescent Pigment Layer for Bright Display Emission
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Solution Overview
Problem
Display devices that emit fluorescence based on liquid crystal orientation face challenges in producing clear fluorescence in bright environments due to limited solubility of fluorescent materials in liquid crystals, making it impractical to increase the thickness of the liquid crystal layer to achieve sufficient fluorescence.
Innovation Solution
A display device with a separate fluorescent emission layer containing dichroic fluorescent pigment molecules that absorb light and emit fluorescence, oriented such that transition dipole moments are in the same direction, allowing for varying emission intensity without increasing the liquid crystal layer thickness, and incorporating an ultraviolet absorbing layer to protect the liquid crystal layer from UV light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a significant amount of fluorescent material is added to the liquid crystal layer to emit bright fluorescence, then the fluorescence intensity is improved, but the solubility of fluorescent material in liquid crystal is limited making it difficult to achieve clear fluorescence in bright environments
Solution Approach 1:
The patent divides the system into two separate functional layers: a liquid crystal layer for orientation control and a fluorescent emission layer for light emission. This segmentation allows the fluorescent material to be concentrated in the emission layer without being limited by solubility constraints in the liquid crystal layer, thereby achieving both high fluorescence intensity and material solubility requirements simultaneously.
Solution Approach 2:
The patent transitions from a single-layer liquid crystal system to a multi-layer structure with distinct functional zones. By adding the fluorescent emission layer as a separate dimension in the layer stack, the system achieves enhanced fluorescence emission without compromising the liquid crystal's optical properties or material solubility limits.
2Illumination intensity
If the thickness of the liquid crystal layer is increased to allow sufficient fluorescent material to be added, then the fluorescence emission is improved, but increased voltage is required which makes it impractical
Solution Approach 1:
The patent separates the fluorescence emission function from the liquid crystal layer by creating a dedicated fluorescent emission layer. This allows sufficient fluorescent material to be incorporated in the emission layer without increasing the liquid crystal layer thickness, thereby maintaining practical operating voltage levels while achieving strong fluorescence emission.
Solution Approach 2:
The patent extracts the fluorescent emission function from the liquid crystal layer and places it in a separate fluorescent emission layer. This extraction allows the liquid crystal layer to maintain its original thickness and voltage requirements while the fluorescent layer provides enhanced emission capability independently.
3Illumination intensity
If fluorescent material is added to the liquid crystal layer to increase color intensity, then the fluorescence is enhanced, but the display panel cannot emit clear fluorescence under bright environments due to solubility limitations
Solution Approach 1:
The patent segments the system into a liquid crystal layer for orientation control and a separate fluorescent emission layer for light emission. This separation allows the fluorescent emission layer to contain high concentrations of fluorescent material for intense color emission, while the liquid crystal layer maintains its optical clarity, together achieving clear fluorescence visibility in bright environments.
Solution Approach 2:
The patent creates a composite structure with a liquid crystal layer and a fluorescent emission layer, each optimized for its specific function. The fluorescent emission layer uses materials and compositions tailored for high fluorescence intensity, while the liquid crystal layer maintains its electro-optic properties, resulting in a composite system that achieves both color intensity and clarity in bright environments.
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 display device to emit sufficient fluorescence without increasing the liquid crystal layer thickness, providing improved brightness and contrast while protecting the liquid crystal layer from ultraviolet light.
Implementation Method 1
fluorescent pigment molecules that absorb light to emit fluorescence
Implementation Method 2
dichroic fluorescent pigment molecules with different emission intensities depending on a direction of emission
Implementation Method 3
controlling orientation of liquid crystal in the liquid crystal layer
Implementation Method 4
capable of switching between a transparent state and a scattering state
Implementation Method 5
incorporating an ultraviolet absorbing layer to protect the liquid crystal layer from UV light
Data Source
AI summary
A display device capable of emitting sufficient fluorescence is provided without an increase in the thickness of the liquid crystal layer. The device includes: a fluorescent emission layer (23) having fluorescent pigment molecules that absorb light to emit fluorescence; and a liquid crystal layer (4) capable of switching between a transparent state and a scattering state. The fluorescent pigment molecules are dichroic fluorescent pigment molecules (23a) with different emission intensities depending on the direction of emission. The dichroic fluorescent pigment molecules (23a) in the fluorescent emission layer (23) are oriented so as to have transition dipole moments with the same direction.