Vehicular information display system and information display system

A vehicular information display system, comprising:

• a light source device that supplies light to an information display device,
• wherein the light source device includes:
• a point-shaped or planar light source;
• an optical means for reducing a divergence angle of light from the light source;
• and
• a light guide having a reflection surface that reflects light from the light source to propagate to the information display device,
• the reflection surface of the light guide is arranged so as to face the information display device, and image light in a specific polarization direction is generated by the information display device,
• a part of a divergence angle of a light flux incident on the information display device from the light source is controlled by a shape and surface roughness of the reflection surface provided in the light source device,
• light in a specific polarization direction is emitted from the information display device as image light, and
• the image light emitted in the specific polarization direction allows image information to be visually recognizable through a window glass by folding back an optical path with a reflection mirror, and the reflection mirror has a reflectance of 20% or more and 40% or less with respect to light having a wavelength in a visible light region so that a situation inside a vehicle can be visually recognized in an information non-display state.

A vehicular information display system, comprising:

• a light source device that supplies light to an information display device,
• wherein the light source device includes:
• a point-shaped or planar light source;
• a first optical means for reducing a divergence angle of light from the light source;
• and
• a second optical means for diffusing a light flux emitted from the first optical means in a horizontal direction of a screen of the information display device,
• light from the light source is incident on a light guide arranged close to a light emission surface of the second optical means, reflected by a reflection surface provided in the light guide, and converted into light in a specific polarization direction by the information display device arranged at a position facing the reflection surface, and a part of a divergence angle of a light flux emitted from the information display device is controlled by a shape and surface roughness of a reflection surface provided in the light source device, and
• the image light emitted in the specific polarization direction allows image information to be visually recognizable through a window glass by folding back an optical path with a reflection mirror, and the reflection mirror has a reflectance of 20% or more and 40% or less with respect to light having a wavelength in a visible light region so that a situation inside a vehicle can be visually recognized in an information non-display state.

An information display system, comprising:

• a light source device that supplies light to an information display device,
• wherein the light source device includes:
• a point-shaped or planar light source;
• an optical means for reducing a divergence angle of light from the light source;
• and
• a light guide having a reflection surface that reflects light from the light source to propagate to the information display device,
• the reflection surface of the light guide is arranged so as to face the information display device,
• light in a specific polarization direction is emitted from the information display device as image light, and
• the image light emitted in the specific polarization direction allows image information to be visually recognizable through a window glass by folding back an optical path with a reflective polarizing plate, and other polarized light is transmitted through the reflective polarizing plate so that an indoor situation can be visually recognized in an information non-display state.

An information display system, comprising:

• a light source device that supplies light to an information display device,
• wherein the light source device includes:
• a point-shaped or planar light source;
• an optical means for reducing a divergence angle of light from the light source;
• and
• a light guide having a reflection surface that reflects light from the light source to propagate to the information display device,
• the reflection surface of the light guide is arranged so as to face the information display device, and image light in a specific polarization direction is generated by the information display device,
• a part of a divergence angle of a light flux incident on the information display device from the light source is controlled by a shape and surface roughness of the reflection surface provided in the light source device,
• light in a specific polarization direction is emitted from the information display device as image light, and
• the image light emitted in the specific polarization direction allows image information to be visually recognizable through a window glass by folding back an optical path with a reflection mirror, and the reflection mirror has a reflectance of 20% or more and 40% or less with respect to light having a wavelength in a visible light region so that an indoor situation can be visually recognized in an information non-display state.

An information display system, comprising:

• a light source device that supplies light to an information display device,
• wherein the light source device includes:
• a point-shaped or planar light source;
• a first optical means for reducing a divergence angle of light from the light source;
• and
• a second optical means for diffusing a light flux emitted from the first optical means in a horizontal direction of a screen of the information display device,
• light from the light source is incident on a light guide arranged close to a light emission surface of the second optical means, reflected by a reflection surface provided in the light guide, and converted into light in a specific polarization direction by the information display device arranged at a position facing the reflection surface, and a part of a divergence angle of a light flux emitted from the information display device is controlled by a shape and surface roughness of a reflection surface provided in the light source device, and
• the image light emitted in the specific polarization direction allows image information to be visually recognizable through a window glass by folding back an optical path with a reflection mirror, and the reflection mirror has a reflectance of 20% or more and 40% or less with respect to light having a wavelength in a visible light region so that an indoor situation can be visually recognized in an information non-display state.