46.4: Ultra‐Thin O‐Polarizers' Superiority over E‐Polarizers for LCDs

Khan, Ir Gvon; Belyaev, Sergey V.; Malimonenko, N.V.; Kleptsyn, V. F.; Kukushkina, M. L.; Masanova, N. N.; Solovei, V. V.; Vorozhtsov, G. N.

doi:10.1889/1.1821346

Cited by 3 publications

(2 citation statements)

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“…A thin polarizer with a thickness less than 1 μm and based on lyotropic liquid crystalline (LLC) molecules has been reported . However, the dichroic ratio of this LLC polarizer is smaller than 25, which cannot satisfy the requirements of high-performance displays.…”

Section: Introductionmentioning

confidence: 99%

“…A thin polarizer with a thickness less than 1 μm and based on lyotropic liquid crystalline (LLC) molecules has been reported. 6 However, the dichroic ratio of this LLC polarizer is smaller than 25, which cannot satisfy the requirements of high-performance displays. Additionally, a high-contrast polarizer with a thickness of 5 μm and based on the guest−host effect has been demonstrated by Peeters et al, 2 but the film is not sufficiently thin and the fabrication process is complicated.…”

Section: Introductionmentioning

confidence: 99%

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Novel Photoalignment Method Based on Low-Molecular-Weight Azobenzene Dyes and Its Application for High-Dichroic-Ratio Polarizers

Pan

Chigrinov

et al. 2018

ACS Appl. Mater. Interfaces

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Photoalignment is a simple technique for the manipulation of molecular orientations, which has been widely used in liquid crystal displays. Here, we propose a novel photoalignment method, in which an azobenzene dye thin film is deposited by thermal evaporation and in situ exposed to linearly polarized light simultaneously. We obtain polarizers with a dichroic ratio of up to 62, which is the highest value ever realized by a photoalignment method. Moreover, the polarizing thin film has a thickness of just 200 nm, compatible with flexible substrates, making it perfect for use as a dichroic polarizer in ultrathin and flexible displays.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel Photoalignment Method Based on Low-Molecular-Weight Azobenzene Dyes and Its Application for High-Dichroic-Ratio Polarizers

Pan

Chigrinov

et al. 2018

ACS Appl. Mater. Interfaces

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Programmable broadband ultrathin micropolarizer based on photoalignment technology

Huang,

Wu,

Luo

et al. 2024

Sci Rep

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A method for creating broadband ultrathin azo dye micropolarizers is introduced, utilizing photoalignment technology and liquid crystal polymers to organize azo dyes into a long-range ordered structure. Achievements include a 3.63 μm thick polarizer with an extinction ratio over 140 and polarization efficiency over 99.3% across 400–650 nm, 5 μm × 5 μm pixel pitch flexible ultrathin checkerboard arrays and 6 μm pixel pitch flexible ultrathin one-dimensional grating with a 0.45 duty ratio through mask exposure technology. After a substrate-transfer technique, the bending cycle test demonstrates the mechanical stability and durability of the broadband ultrathin flexible polarizers, highlighting their potential for widespread use in integrated flexible optoelectronic systems.

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Optical characterization of the nematic lyotropic chromonic liquid crystals: Light absorption, birefringence, and scalar order parameter

et al. 2005

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We report on the optical properties of the nematic (N) phase formed by lyotropic chromonic liquid crystals (LCLCs) in well aligned planar samples. LCLCs belong to a broad class of materials formed by one-dimensional molecular self-assembly and are similar to other systems such as "living polymers" and "wormlike micelles." We study three water soluble LCLC forming materials: disodium chromoglycate, a derivative of indanthrone called Blue 27, and a derivative of perylene called Violet 20. The individual molecules have a planklike shape and assemble into rodlike aggregates that form the phase once the concentration exceeds about 0.1 M. The uniform surface alignment of the N phase is achieved by buffed polyimide layers. According to the light absorption anisotropy data, the molecular planes are on average perpendicular to the aggregate axes and thus to the nematic director. We determined the birefringence of these materials in the N and biphasic N-isotropic (I) regions and found it to be negative and significantly lower in the absolute value as compared to the birefringence of typical thermotropic low-molecular-weight nematic materials. In the absorbing materials Blue 27 and Violet 20, the wavelength dependence of birefringence is nonmonotonic because of the effect of anomalous dispersion near the absorption bands. We describe positive and negative tactoids formed as the nuclei of the new phase in the biphasic N-I region (which is wide in all three materials studied). Finally, we determined the scalar order parameter of the phase of Blue 27 and found it to be relatively high, in the range 0.72-0.79, which puts the finding into the domain of general validity of the Onsager model. However, the observed temperature dependence of the scalar order parameter points to the importance of factors not accounted for in the athermal Onsager model, such as interaggregate interactions and the temperature dependence of the aggregate length.

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46.4: Ultra‐Thin O‐Polarizers' Superiority over E‐Polarizers for LCDs

Cited by 3 publications

References 1 publication

Novel Photoalignment Method Based on Low-Molecular-Weight Azobenzene Dyes and Its Application for High-Dichroic-Ratio Polarizers

Novel Photoalignment Method Based on Low-Molecular-Weight Azobenzene Dyes and Its Application for High-Dichroic-Ratio Polarizers

Programmable broadband ultrathin micropolarizer based on photoalignment technology

Optical characterization of the nematic lyotropic chromonic liquid crystals: Light absorption, birefringence, and scalar order parameter

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