P‐118: Ellipsoidal Light Diffusing Film with Narrow Louver Micro Structure of Refractive index

Katagiri, Baku; Kusama, Kentaro; Orui, Tomoo; Shoshi, Satoru

doi:10.1002/j.2168-0159.2014.tb00376.x

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…When the mixture is irradiated with the UV light, the monomer with higher reactivity aggregates at the upper side of the mixture and photopolymerization of the monomer with higher reactivity is promoted under the aggregates. Consequently, the alternating polymer layers structure is formed by separating from the other monomer with lower reactivity [18], [19].…”

Section: Distribution Control Of Polymer Network Structurementioning

confidence: 99%

Polymer Distribution Control of Polymer-Dispersed Liquid Crystals by Uni-Directionally Diffused UV Irradiation Process

Horii

Shibata

Ishinabe

et al. 2018

IEICE Trans. Electron.

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Recently, a control technique of light distribution pattern has become important to improve the functionality and the light utilization efficiency of electronic displays, illumination devices and so on. As a light control technique, polymer-dispersed liquid crystals (PDLCs) have been commonly used so far. However, a precise control of the light diffusion distribution of conventional PDLC has been difficult due to the random polymer network structure, which results in the low light utilization efficiency. On the other hand, reverse-mode PDLCs with homogeneously aligned molecules can anisotropically diffuse light. The reverse-mode PDLC, however, has polarization dependency in the haze value due to homogeneously aligned molecules, which also results in the low light utilization efficiency. Therefore, it is necessary to establish the optimization method of light diffusion distribution without the molecules alignment treatment, and we have proposed a novel PDLC with structure-controlled polymer network which was fabricated by the irradiation with uni-directionally diffused UV light. In this paper, we investigated the effect of the process temperature during UV irradiation on the internal structure and light diffusion distribution of the proposed PDLC. As a result, in case that the mixture during UV irradiation was in isotropic phase, we clarified that the structure-controlled PDLCs with alternating striped LCs/polymer pattern could be obtained because the mixture was sufficiently irradiated with uni-directionally diffused UV light. For the high haze, this structure-controlled PDLC should be fabricated as low temperature as possible with maintaining the mixture in isotropic phase so that the mixture was not a nano-scaled molecular mixing state. Also, this PDLC had no polarization dependency in the haze value and could electrically switch the light distribution pattern between anisotropic light diffusion and light transmission. From the above results, we concluded that the proposed PDLC could precisely control the light diffusion distribution, and realize the high light utilization efficiency.

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Section: Distribution Control Of Polymer Network Structurementioning

confidence: 99%

Polymer Distribution Control of Polymer-Dispersed Liquid Crystals by Uni-Directionally Diffused UV Irradiation Process

Horii

Shibata

Ishinabe

et al. 2018

IEICE Trans. Electron.

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Elimination of ambient light reflection color in automotive organic light emitting diode displays

Choi

Baek²,

Lee

et al. 2022

Optical Materials

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Diffraction mechanism of a light-diffusing film with an alternate-polymer-layer structure

et al. 2017

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A diffraction mechanism, and an optical model to reflect that mechanism, for a light-diffusing film with an alternate-polymer-layer structure was proposed and validated. According to this model, the film forms an angular distribution of light intensity that is almost constant in a certain scattering-angle (cutoff angle) range and drastically decreases outside that range; that is, the profile is similar to a trapezoid. Although the trapezoid intensity distribution (TID) is a fundamental distribution of the film, the mechanism to form the TID has not previously been clarified. A key mechanism is that the refractive-index distribution of the layer structure is expressed as stacked phase gratings, some of which should diffract zeroth-order light to higher orders strongly, and the repetition of this multiple diffraction spreads light over the whole cutoff angle range, thereby generating the TID. To verify the proposed mechanism, intensity distributions were calculated by using the proposed model. The calculation results indicate that the proposed model reproduces the TID.

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P‐118: Ellipsoidal Light Diffusing Film with Narrow Louver Micro Structure of Refractive index

Cited by 4 publications

References 5 publications

Polymer Distribution Control of Polymer-Dispersed Liquid Crystals by Uni-Directionally Diffused UV Irradiation Process

Polymer Distribution Control of Polymer-Dispersed Liquid Crystals by Uni-Directionally Diffused UV Irradiation Process

Elimination of ambient light reflection color in automotive organic light emitting diode displays

Diffraction mechanism of a light-diffusing film with an alternate-polymer-layer structure

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