Display Device with Reactive Mesogen Alignment and Color Conversion
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Solution Overview
Problem
Conventional liquid crystal display devices face challenges in achieving high color purity and reliability, particularly in terms of optical efficiency and manufacturing processes that can degrade display components.
Innovation Solution
A display device design incorporating a light source, a display panel with a liquid crystal layer, alignment-inducing layers containing polymerized reactive mesogens, and a color conversion layer with fluorescent substances or quantum dots, which absorbs one color of light to emit another, improving color gamut and light efficiency while omitting high-temperature manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional liquid crystal display devices use traditional alignment methods (rubbing, optical alignment), then liquid crystal molecules can be aligned in a determined direction, but the manufacturing process becomes complex and time-consuming
Solution Approach 1:
The patent changes the chemical parameters of the alignment-inducing layer by using reactive mesogens that undergo polymerization. This chemical transformation allows the alignment function to be achieved through material property changes rather than complex mechanical or optical processes, simplifying the manufacturing while maintaining effective liquid crystal alignment
Solution Approach 2:
The patent extracts and eliminates the need for traditional rubbing or optical alignment processes by incorporating alignment-inducing functionality directly into the polymerized reactive mesogen layer. This removal of separate alignment steps reduces manufacturing complexity while preserving the essential alignment function
2Stability of the object's composition
If high-temperature manufacturing processes are used to form alignment layers, then proper alignment can be achieved, but display components degrade and reliability decreases
Solution Approach 1:
The patent utilizes photopolymerization phase transition instead of thermal curing. The reactive mesogens transition from liquid monomer state to solid polymer network through UV irradiation, enabling alignment layer formation at low temperatures that prevent degradation of heat-sensitive display components while achieving the necessary structural organization for proper alignment
Solution Approach 2:
The patent changes the temperature parameter of the manufacturing process from high-temperature thermal curing to low-temperature photopolymerization. This parameter change allows alignment layer formation without exposing display components to degrading high temperatures, thereby improving reliability while maintaining alignment functionality
3Stability of the object's composition
If the color conversion layer is disposed away from the light source, then liquid crystal alignment is maintained, but optical efficiency and color purity decrease
Solution Approach 1:
The patent segments the display structure into distinct functional layers with the color conversion layer positioned in the optical path between the light source and liquid crystal layer. This segmentation allows each layer to perform its function optimally - the color conversion layer converts wavelengths before light enters the liquid crystal layer, improving optical efficiency while the alignment-inducing layers maintain proper liquid crystal orientation
Solution Approach 2:
The patent introduces alignment-inducing layers as intermediary elements between the color conversion layer and the liquid crystal layer. These intermediary layers mediate the interaction between converted light and liquid crystal molecules, maintaining proper alignment while allowing the color conversion layer to be positioned optimally for energy efficiency and color purity
4Stability of the object's composition
If conventional alignment methods are used, then liquid crystal molecules can be aligned, but the manufacturing time and process complexity increase
Solution Approach 1:
The patent merges the alignment layer formation process with the liquid crystal layer fabrication process. The reactive mesogen layer is applied and polymerized in integration with the liquid crystal layer manufacturing sequence, eliminating separate alignment steps and reducing total manufacturing time while achieving effective liquid crystal alignment through the polymerized mesogen structure
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
Enhances color purity and reliability by improving light efficiency and reducing component degradation, resulting in a display with better color reproduction and longer-lasting performance.
Implementation Method 1
The color conversion layer includes fluorescent substances or quantum dots, which absorbs one color of light to emit another
Implementation Method 2
The first alignment-inducing layer includes a polymerized first reactive mesogen
Data Source
AI summary
A display device includes a display panel and a light source to provide a first color light to the display panel. The display panel includes a first substrate, a second substrate facing the first substrate, a liquid crystal (LC) layer disposed between the first substrate and the second substrate, a first alignment-inducing layer disposed between the first substrate and the LC layer, a second alignment-inducing layer disposed between the second substrate and the LC layer, a color conversion layer disposed on the LC layer. The second substrate is disposed more adjacent to the light source than the first substrate. The LC layer includes LC molecules. The first alignment-inducing layer includes a polymerized first reactive mesogen. The color conversion layer includes an illuminant to absorb the first color light from the light source to emit a color of light different from a first color of the first color light.