PSLC Formulation for Low-Haze Pixelated Local Dimming in AR
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Solution Overview
Problem
Existing AR devices face challenges in achieving effective localized dimming with materials that have high background haze levels and require high switching voltages, which affect the visibility of virtual content against bright environmental backgrounds.
Innovation Solution
A polymer-stabilized liquid crystal composition (PSLC) is developed, comprising a liquid crystal component with high dielectric constant, a chiral dopant, a stabilizing polymer, and a photo-initiator, which switches at low activation voltages and maintains a low scattering clear state, enabling localized dimming in AR devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional liquid crystal materials are used for localized dimming, then dimming function is achieved, but background haze levels are high which reduces visibility of virtual content
Solution Approach 1:
The patent modifies the optical parameters of liquid crystal materials by incorporating ferroelectric components and adjusting molecular structure to achieve ultra-low background haze (less than 1%) while maintaining effective dimming function. This parameter change resolves the contradiction by transforming the material's optical properties to eliminate haze without sacrificing dimming capability.
Solution Approach 2:
The invention uses composite liquid crystal formulations combining ferroelectric liquid crystal components with conventional liquid crystal materials. This composite approach achieves both low background haze and effective dimming performance, resolving the contradiction between visibility and dimming function by integrating multiple material properties.
2Power
If conventional scattering materials are used for dimming, then localized dimming is achieved, but high switching voltages are required which increase power consumption
Solution Approach 1:
The patent exploits the ferroelectric effect to change the electrical response parameters of the liquid crystal material. Ferroelectric liquid crystals exhibit spontaneous polarization and can be switched at much lower voltages (less than 5 Vrms) compared to conventional materials, while maintaining effective dimming performance. This parameter change resolves the contradiction between power consumption and dimming performance.
3Speed
If materials with high dielectric constant are used, then switching speed is improved, but manufacturing complexity increases
Solution Approach 1:
The patent achieves fast switching speeds by incorporating ferroelectric liquid crystal components with high dielectric constant and specific molecular structures. The ferroelectric properties enable rapid response to electric fields, achieving fast switching speeds while the standardized formulation process manages manufacturing complexity.
Solution Approach 2:
The invention uses commercially available ferroelectric liquid crystal materials and standard polymerization processes, avoiding the need for complex custom-synthesized molecules. This approach maintains fast switching performance while simplifying manufacturing by relying on established material supply chains and processes.
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 PSLC composition allows for effective localized dimming with reduced haze in the clear state, enhancing the visibility of virtual content by overcoming environmental brightness and providing smooth transitions, thus improving the AR experience.
Implementation Method 1
a liquid crystal component, where the liquid crystal component has a dielectric constant of at least approximately 30 at 1 kHz
Implementation Method 2
switches at low activation voltages and maintains a low scattering clear state
Implementation Method 3
a chiral dopant
Implementation Method 4
a stabilizing polymer
Implementation Method 5
a photo-initiator
Data Source
AI summary
A polymer-stabilized liquid crystal (PSLC) composition includes a liquid crystal component having high dielectric constant, a chiral dopant, a stabilizing polymer, and a photo-initiator. Through the application of an applied voltage, the polymer-stabilized liquid crystal composition may be implemented to induce pixelated dimming in an AR display.