Liquid Crystal Display Panel Using Reactive Mesogen Polymer Network
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Solution Overview
Problem
Liquid crystal display panels face challenges in achieving fast response speeds for 3D image display due to limitations in controlling liquid crystal properties such as rotating viscosity, bend modulus, and refractive anisotropy, which are interdependent, making it difficult to improve turn-on and turn-off response times effectively.
Innovation Solution
A display panel design incorporating a liquid crystal layer with reactive mesogen polymer and nano-rods between electrodes, where an electric field is applied and ultraviolet light is used to form a reactive mesogen polymer, supporting the alignment of liquid crystal molecules without an alignment layer, allowing for independent control of liquid crystal properties and improved response speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If liquid crystal properties (rotating viscosity, bend modulus, refractive anisotropy) are adjusted to improve turn-off response speed, then response speed improves, but the properties have traded-offs and cannot be independently controlled
Solution Approach 1:
The patent introduces a polymer network as an intermediary structure within the liquid crystal composition. This polymer network, formed by reactive mesogens, acts as a mediator that provides physical anchoring and structural support to the liquid crystal molecules, enabling independent control of response characteristics without being constrained by the traditional trade-offs between rotating viscosity, bend modulus, and refractive anisotropy.
Solution Approach 2:
The patent creates a composite liquid crystal system comprising liquid crystal molecules, reactive mesogens that form polymer networks, and nanoparticles. This composite structure allows the liquid crystal properties to be decoupled and controlled independently - the polymer network provides structural stability while the liquid crystal molecules maintain their optical properties, thus resolving the interdependence issue.
2Speed
If traditional liquid crystal display panels are used, then manufacturing is straightforward, but response speed is low making 3D image display quality difficult to improve
Solution Approach 1:
The patent applies preliminary action by forming the polymer network structure before final liquid crystal alignment is established. The reactive mesogens are positioned and oriented in advance within the liquid crystal composition, and upon UV irradiation, they form a pre-established polymer network that guides subsequent liquid crystal molecule alignment, thereby achieving fast response speeds while maintaining manufacturability.
Solution Approach 2:
The patent changes the physical and chemical parameters of the liquid crystal system by introducing reactive mesogens that undergo photopolymerization. This parameter change transforms the liquid crystal composition from a simple mixture to a dynamic system with controllable polymer network formation, enabling fast response speeds without significantly complicating the manufacturing process.
3Speed
If response speed is improved for 3D image display, then display quality improves, but brightness may decrease and crosstalk may increase
Solution Approach 1:
The patent applies local quality by creating spatially differentiated regions within the liquid crystal composition. The polymer network is formed locally at specific positions where reactive mesogens are concentrated, providing localized structural support and alignment guidance. This localized polymer network formation allows fast response in specific regions without compromising overall brightness and viewing quality.
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 approach enhances the response speed of liquid crystal molecules, enabling faster switching between white and black modes, improving light transmittance and reducing crosstalk, while maintaining high brightness and minimizing power consumption.
Implementation Method 1
An ultraviolet light is irradiated to the liquid crystal composition when the electric field is formed, to form a reactive mesogen polymer
Implementation Method 2
An electric field is provided to a liquid crystal composition interposed between the display substrate and the opposite substrate
Data Source
AI summary
In a display panel and a method of manufacturing the display panel, the display panel includes a display substrate including a first electrode and a second electrode insulated from the first electrode and disposed on the first electrode, an opposite substrate including a third electrode facing the second electrode, and a liquid crystal layer interposed between the display substrate and the opposite substrate. The liquid crystal layer includes liquid crystal molecules, a reactive mesogen polymer, and nano-rods.