| abstract |
The present invention provides a composite retardation plate that is thinner and capable of performing uniform polarization conversion in a wider wavelength range. A retardation plate (1) obtained by polymerizing a liquid crystal compound having a polymerizable group, and a retardation plate (2) containing an organically modified clay complex and a binder resin, the wavelength λ (nm ) In which the birefringence index Δn (λ) satisfies the expressions (3) and (4). Δn (451) / Δn (549) ≦ 1.04 (3) 0.98 ≦ Δn (628) / Δn (549) (4) [Selection figure] None |