| 摘要 |
An illuminating device includes a light guide plate, a light source disposed on a side face of the light guide plate, and a light modulation element disposed on the surface or on the inside of the light guide plate and joined to the light guide plate. The light modulation element has a pair of transparent substrates disposed apart from each other and opposed to each other, an electrode capable of generating an electric field in a direction parallel to the surface of the transparent substrates, and a light modulation layer provided in a gap between the pair of transparent substrates, and including a first region and a second region whose response speeds to the electric field are different from each other, and at least one of the first region and the second region has optical anisotropy.
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