PDLC Display Domain Tuning to Minimize Afterimage Haze
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Polymer dispersed liquid crystal displays (PDLCDs) suffer from afterimages due to haze differences between individually driven domains, which persist until the haze difference disappears.
Innovation Solution
A polymer dispersed liquid crystal display with specific domain sizes (0.8 to 1.5 μm) and thickness (15 to 25 μm) using a PDLC layer with a polymer precursor containing a first compound (5 to 50% by weight) and a liquid crystal droplet with a second compound (3 to 20% by weight) and a third compound (50 to 1000 ppm) to enhance interface energy, preventing haze differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If individually driven domains are implemented in PDLCD, then domain control flexibility is improved, but afterimage is generated due to haze differences between domains
Solution Approach 1:
The patent applies local quality by optimizing specific parameters (liquid crystal droplet size: 0.8-1.5 μm, PDLC layer thickness: 15-25 μm) in specific regions to reduce afterimage effects while maintaining individual domain control capability. This localized parameter optimization allows each domain to transition more uniformly, minimizing haze differences between adjacent domains.
Solution Approach 2:
The patent employs parameter changes by precisely controlling the liquid crystal droplet size (0.8-1.5 μm) and PDLC layer thickness (15-25 μm) to achieve uniform optical properties across domains. These parameter optimizations ensure that when domains transition between states, the haze difference is minimized to below 0.3%, thereby reducing afterimage while preserving domain control flexibility.
2Illumination intensity
If liquid crystal droplet size is reduced, then scattering efficiency is improved, but afterimage increases due to greater haze difference
Solution Approach 1:
The patent applies parameter changes by optimizing the liquid crystal droplet size to a specific range (0.8-1.5 μm). This optimized size range achieves the right balance: small enough to provide good scattering efficiency when needed, but not so small that excessive haze differences occur during domain transitions, thereby minimizing afterimage effects.
Solution Approach 2:
The patent uses composite materials by combining liquid crystal droplets of optimized size with a polymer matrix in specific proportions. This composite structure ensures uniform optical properties and controlled haze differences during domain transitions, achieving both good scattering efficiency and reduced afterimage.
3Illumination intensity
If PDLC layer thickness is increased, then scattering performance is improved, but response time increases
Solution Approach 1:
The patent applies parameter changes by optimizing the PDLC layer thickness to a specific range (15-25 μm). This optimized thickness provides sufficient scattering performance while maintaining fast response times, as the liquid crystal molecules can reorient quickly within this thickness range, enabling rapid transitions between scattering and transmission states.
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 effectively reduces afterimages to less than 0.3% haze difference, ensuring rapid transition between scattering and transmission states without color distortion or reduced scattering efficiency.
Implementation Method 1
in the absence of an initial potential difference, the scattered state in which incident light is scattered can be controlled
Implementation Method 2
by applying a potential difference to the film and aligning the liquid crystal molecules in the same direction as the light direction, the transparent state in which incident light passes without scattering can be controlled
Data Source
AI summary
One embodiment of the present application provide a polymer dispersed liquid crystal display including a first electrode; a second electrode on the first electrode; and a PDLC layer disposed between the first electrode and the second electrode; wherein the PDLC layer includes a liquid crystal droplet and a polymer surrounding the liquid crystal droplet, the liquid crystal droplet has a size in the range of 0.8 to 1.5 μm, the PDLC layer has a thickness in the range of 15 to 25 μm, and wherein the polymer dispersed liquid crystal display has multiple domains driven individually.