PDLC Light Blocking Device with Twisted LC-Dye Droplets
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Solution Overview
Problem
Current transparent display devices face challenges in achieving high light blocking rates and transmittance due to limitations in polymer dispersed liquid crystal (PDLC) technology, particularly with regards to power consumption and contrast ratio, especially in varying environmental conditions.
Innovation Solution
A light blocking device utilizing a PDLC layer where liquid crystals and dichroic dyes are twisted within droplets, allowing for enhanced light blocking in the light blocking mode and increased transmittance in the light transmitting mode, while controlling the twisted angle to optimize performance and prevent increased driving voltage and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a PDLC layer is used to achieve light blocking mode, then light blocking capability is improved, but power consumption increases
Solution Approach 1:
The patent applies parameter changes by modifying the voltage application strategy to the PDLC layer. By using a two-stage voltage approach (initial high voltage for rapid transition, then reduced voltage for maintenance), the system achieves effective light blocking while reducing overall power consumption compared to continuous high voltage application.
Solution Approach 2:
The patent implements periodic action through pulsed voltage application to the PDLC layer. The initial voltage pulse triggers the phase transition to blocked state, followed by periodic maintenance pulses at lower amplitude, creating a rhythm of energy input that sustains the light blocking function with reduced average power consumption.
2Object-affected harmful factors
If liquid crystals and dichroic dyes are twisted in droplets to enhance light blocking, then light blocking rate is improved, but driving voltage increases
Solution Approach 1:
The patent utilizes parameter changes by optimizing the twisted angle of liquid crystals and dichroic dyes within the PDLC droplets. By controlling the twist angle parameter, the system enhances light blocking rate through improved optical anisotropy and dichroic absorption, while the two-stage voltage approach prevents excessive driving voltage by using reduced maintenance voltage after initial alignment.
3Object-affected harmful factors
If liquid crystals and dichroic dyes are twisted in droplets to enhance light blocking, then light blocking rate is improved, but power consumption increases
Solution Approach 1:
The patent applies parameter changes by optimizing the twisted angle of liquid crystals and dichroic dyes within the PDLC droplets. By controlling the twist angle parameter, the system enhances light blocking rate through improved optical anisotropy and dichroic absorption, while the two-stage voltage approach prevents excessive driving voltage by using reduced maintenance voltage after initial alignment.
Solution Approach 2:
The patent implements periodic action through pulsed voltage application to the PDLC layer. The initial voltage pulse triggers the phase transition to blocked state, followed by periodic maintenance pulses at lower amplitude, creating a rhythm of energy input that sustains the light blocking function with reduced average power consumption.
4Illumination intensity
If LCD technology with polarizer is used to achieve transparency, then transparency is improved, but outdoor visibility deteriorates
Solution Approach 1:
The patent applies composite materials by combining PDLC technology with dichroic dyes embedded in liquid crystal droplets. This composite structure provides both the transparency control of PDLC and the wavelength-selective absorption of dichroic dyes, enabling high transparency in indoor conditions while maintaining contrast and visibility in outdoor environments through the dichroic absorption properties.
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 improves light blocking rates and transmittance, maintaining image quality and reducing power consumption by effectively managing the alignment and interaction of liquid crystals and dichroic dyes, thus addressing the limitations of existing PDLC technologies.
Implementation Method 1
A light blocking device utilizing a PDLC layer where liquid crystals and dichroic dyes are twisted within droplets, allowing for enhanced light blocking in the light blocking mode and increased transmittance in the light transmitting mode
Implementation Method 2
A light blocking device utilizing a PDLC layer where liquid crystals and dichroic dyes are twisted within droplets
Implementation Method 3
The liquid crystal is converted into a droplet in the polymer, thereby producing the PDLC. When an electric field is applied to the PDLC, the alignment of the liquid crystal located in the polymer is changed.
Data Source
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Figure 5~6A
AI summary
Disclosed are a light blocking device, a method of manufacturing the same, and a transparent display device including the same, which transmit or block light by using a polymer dispersed liquid crystal (PDLC) layer. The light blocking device includes a first substrate and a second substrate facing each other, a first electrode on the first substrate, a second electrode on the second substrate, and a PDLC layer between the first electrode and the second electrode. The PDLC layer includes a droplet including liquid crystal and dichroic dye, and the liquid crystal and the dichroic dye are twisted with each other and aligned.