Patent ID: 7505188

Claim:
A light control device comprising a plurality of optical elements disposed between two transparent plates, said optical elements each comprising a pair of transparent substrates with transparent electrodes facing each other and a light control layer, disposed between the pair of transparent electrodes, capable of changing the light transmitting state by electrically controlling the pair of transparent electrodes, wherein a transparent solid layer is disposed in a space formed in the gap between the two transparent plates, the transparent substrates have taper-shaped side faces, the optical element is a transmitting and scattering type liquid crystal optical element, and when the refractive index of any of the transparent plates is represented by n a , the refractive index of the transparent solid layer is represented by n b , the refractive index of any of the transparent substrates is represented by n c and the taper angle of any of the transparent substrates is represented by θ (degree), there is a relation of n a >n b , and when n b >n c , the following Formula 1 is satisfied, and when n b <n c , the following Formula 2 is satisfied: θ<180−sin −1 (1 /n b )−sin −1 ( n c /n b ) Formula 1 θ<sin −1 ( n b /n c )−sin −1 (1 /n c ) Formula 2.