Liquid crystal display device having particular constructed sapphire substrate

A transparent member for a projection-type liquid crystal display device in which a light from a light source transmits through a lens, a polarizing plate and a liquid crystal panel so as to be projected,

• wherein the transparent member forms any one of the lens, a retaining plate for retaining a polarizer of the polarizing plate and a transparent substrate constructing the liquid crystal panel,
• wherein the transparent member is comprised of a sapphire substrate, and
• wherein the sapphire substrate is constructed in a manner that an angle made by a C-axis direction or C-axis projection line direction and a polarized light transmission axis is set within a range of ±20°, or an angle made by an axis perpendicular to the C-axis and a polarized light transmission axis is set within a range of ±2° or an angle made by a C-plane and a plane vertical to a transmission direction of a polarized light to be transmitted is set within a range of ±2°.