| abstract |
A thin and low-cost polarization conversion element and a polarization conversion device capable of controlling polarization conversion are provided. A lens array layer having a function of separating incident light into a first polarization component and a second polarization component, and a function of condensing at least one of the polarization components, and polarization In the polarization conversion element having the polarization conversion layer 6 that periodically forms the rotation region and the polarization non-rotation region, the lens array layer 7 is provided on at least one of the pair of substrates and the pair of substrates. And an electrode capable of applying an electric field between the pair of substrates, and a liquid crystal 8 provided between the pair of substrates and capable of controlling the refractive index distribution by the electric field applied by the electrodes. [Selection] Figure 1 |