Abstract: An optical member including a polarizing plate having an absorption axis and a transmission axis which are orthogonal to each other, a reflective polarizing plate having a reflection axis and a transmission axis which are orthogonal to each other, and an optical anisotropic diffusion layer which is provided between the polarizing plate and the reflective polarizing plate and whose linear transmittance varies according to an incident light angle.

Abstract: A head-up display device includes: a light source; a liquid crystal display device that controls a transmittance of light from the light source and displays an image on a display member; an illuminance sensor that measures an environmental illuminance; and a control circuit that uses a measurement result of the illuminance sensor to control a brightness of the light source. The control circuit controls the brightness of the light source to prevent a border caused by a difference between a black brightness of a display area displayed on the display member by the liquid crystal display device and a black brightness of a background around the display area from being visually recognized.

Abstract: A liquid crystal display device for a head-up display device includes: a light source unit including a reflection film provided on a substrate, and a light-emitting element; a liquid crystal display element including a first polarizer provided on the light source unit side, and a second polarizer disposed to be opposed to the first polarizer via a liquid crystal layer; a retardation plate provided between the reflection film and the first polarizer, and imparting a retardation of ?/4 to light; a reflective polarizer provided between the retardation plate and the first polarizer, and reflecting a light component which is parallel to a reflection axis; and a diffusion member provided between the reflective polarizer and the first polarizer, and diffusing light.

Abstract: A liquid crystal display includes: a liquid crystal panel of a vertical alignment (VA) type; first and second TAC (triacetyl cellulose) films which sandwich the liquid crystal panel; first and second retardation plates which sandwich the first and second TAC films; and first and second polarizers which sandwich the first and second retardation plates. The first and second polarizers include first and second absorption axes, respectively, which are substantially perpendicular to each other. The first and second retardation plates include first and second slow axes, respectively, which are substantially perpendicular to each other. The first and second slow axes intersect at about 45° with the first and second absorption axes, respectively.

Abstract: A liquid crystal display device for a head-up display device includes: a light source unit including a reflection film provided on a substrate, and a light-emitting element; a liquid crystal display element including a first polarizer provided on the light source unit side, and a second polarizer disposed to be opposed to the first polarizer via a liquid crystal layer; a retardation plate provided between the reflection film and the first polarizer, and imparting a retardation of ?/4 to light; a reflective polarizer provided between the retardation plate and the first polarizer, and reflecting a light component which is parallel to a reflection axis; and a diffusion member provided between the reflective polarizer and the first polarizer, and diffusing light.