Patent ID: 7057683
Filing Date: 2006-06-06
Classification: G02B,G02F,H04N

Abstract:
1. A light control device comprising: a guest-host liquid crystal element for controlling light, comprising a negative or positive liquid crystal as a host material and a positive or negative dichroic dye as a guest material; a filter material which comprises at least one selected from an ultraviolet cut-off film, ultraviolet cut-off coated glass, and ultraviolet absorbing glass, and which is provided in the same area as the section of an effective optical path of incident light on the light incidence side of the liquid crystal element, for absorbing at least ultraviolet rays; and a polarizer provided as that it can be taken in and out of the effective optical path of light incident on the liquid crystal element; wherein the polarizer is taken in and out of the effective optical path of incident light according to the predetermined transmittance of the guest-host liquid crystal element for controlling light.