Patent ID: 8023188

Claim:
A display device, comprising: a liquid crystal display panel including a liquid crystal layer; and an optical film positioned on a side of the liquid crystal display panel, the optical film comprising: an anisotropic layer having a first refractive index for a first ray and a second refractive index for a second ray, the first ray and the second ray being included in a light that is incident upon the anisotropic layer from a first side in an incident direction, the first ray is polarized in a first direction that is substantially perpendicular to the incident direction, the second ray is polarized in a second direction that is substantially perpendicular to the incident direction, the second ray comprising a first component and a second component, the first ray and the second component of the second ray irradiate from the anisotropic layer; an isotropic layer provided below the anisotropic layer, the isotropic layer having a third refractive index that is substantially identical to the first refractive index so that the first ray and the second component of the second ray, which irradiate from the anisotropic layer, pass through the isotropic layer; a λ/4 phase difference layer formed below the isotropic layer to delay a wavelength of the first ray and the second component of the second ray, which irradiate from the isotropic layer by approximately λ/4, when the first ray and the second ray pass through the λ/4 phase difference layer; and a λ/2 phase difference layer partially provided below the λ/4 phase difference layer to delay the wavelength of the second component of the second ray by approximately λ/2 when the second component of the second ray passes through the λ/2 phase difference layer and irradiates toward a second side that is opposite to the first side.