Dai Nippon Printing Co., Ltd.

Dai Nippon Printingco., Ltd.

Yasunori Hayashida

Yusuke Hagiwara

Keisuke Miura

Makoto Yamaki

Hiroshi Kubota

Tomoya Kawashima

Yukihiro Kyouden

Provided is a light control film capable of gradually changing the in-plane transmittance and thereby adding an in-plane gradation between light and dark. A light control filmaccording to the present invention includes: a first electrodeA and a second electrodeB disposed facing each other; a light control materialdisposed between the first electrodeA and the second electrodeB and changing the transmittance in accordance with the potential difference between the first electrodeA and the second electrodeB; and a potential gradient forming part for providing the gradient of the potential difference in the extension direction of the first electrodeA and the second electrodeB.

Light control film, method for driving light control film, light control member, and vehicle

Provided is a laminate which can not only control the amount of external light transmitted, but can also be used as a mirror. A laminatecomprises: a first liquid crystal member; a reflection type polarizing member; and a second liquid crystal member. The first liquid crystal member has first liquid crystal cells with changing orientation states, and a first absorption type polarizing member. The first liquid crystal cells can be switched: between a mode where one type of polarized light of the incident light is blocked and the other type of polarized light is transmitted, and a mode where one type of polarized light of the incident light is blocked and the other type of polarized light is shifted and then transmitted; between a mode where the incident light is transmitted as-is, and a mode where one type of the polarized light is blocked and the other type of polarized light is transmitted; and between a mode where one type of polarized light of the incident light is blocked and the other type of polarized light is transmitted, and a mode where one type of polarized light of the incident light is transmitted and the other type of polarized light is blocked. The reflection type polarizing member receives the light transmitted by the first liquid crystal member, transmits one type of polarized light of the incident light, and reflects the other type of polarized light. The second liquid crystal member has second liquid crystal cells with changing orientation states, and a second absorption type polarizing member. When the reflection type polarizing member has transmitted polarized light, the second liquid crystal cells can be switched between a mode where the polarized light is blocked and a mode where the polarized light is transmitted.

Laminate, light control device, light control member, and vehicle

A liquid crystal light control apparatus includes a liquid crystal light control film and power supply device that drives liquid crystal light control film. Liquid crystal light control film has a structure wherein liquid crystal layer is sandwiched between paired transparent electrode layers, and used by being adhered to a large transparent member. Power supply device supplies a predetermined AC voltage between terminals a and b of liquid crystal light control film. A condition |Z|&#x2264;&#x3b1;&#xd7;RF is set where RF is a DC resistance between terminals a and b of liquid crystal light control film, |Z| is an output impedance between terminals A and B of power supply device, and predetermined coefficient &#x3b1;=0.2. In order to protect power supply device, condition Vp/Imax&#x2264;|Z|&#x2264;&#x3b1;&#xd7;RF is set where Vp is output peak voltage of power supply device and Imax is maximum allowable current.

Liquid crystal light control apparatus and method for manufacturing same

A light control film is capable of gradually changing the in-plane transmittance and thereby adding an in-plane gradation between light and dark. A light control film includes: a first electrode and a second electrode disposed facing each other; a light control material disposed between the first electrode and the second electrode and changing the transmittance in accordance with the potential difference between the first electrode and the second electrode; and a potential gradient forming part for providing the gradient of the potential difference in the extension direction of the first electrode and the second electrode.

Growing community of inventors

Tokyo, Japan

Yasunori Hayashida