Head-up display apparatus and image display apparatus thereof

An image display apparatus used in a head-up display apparatus, the head-up display apparatus projecting image light onto a windshield of a vehicle or a combiner provided just before the windshield to provide an image to a driver by a virtual image obtained from reflected light of the image light, the image display apparatus comprising at least:

• a solid light source;
• a collimator converting, into substantially parallel light, light emitted from the solid light source;
• a light guide, the light emitted from the collimating optical system being incident on the light guide, and the light guide emitting the incident light in a predetermined direction;
• and
• a liquid crystal display element provided on an emission surface of the light guide,
• wherein the light guide is configured to emit the incident light in a desired optical-axis direction different from an optical axis of the incident light, and to have a distribution about an intensity of light propagating emitted from the light guide,
• wherein the light guide includes:
• an incident portion, the light being incident on the incident portion;
• a reflection portion reflecting the incident light;
• and
• an emission portion emitting the light reflected by the reflection portion,
• wherein the reflection portion is composed of a plurality of reflection surfaces reflecting the incident light, and a plurality of connection surfaces each connected between the plurality of reflection surfaces, and
• wherein a ratio Lr/Lc between lengths Lr and Lc is different depending on the location, the length Lr being a length of a slope projected in a normal direction with respect to each emission direction of the reflection surfaces of the reflection portion, and the length Lc being a length of a slope projected in a normal direction with respect to each emission direction of the connection surfaces connected to the reflection surfaces.