Air floating video display apparatus and light source apparatus

An air floating video display apparatus for forming an air floating video, comprising:

• a display panel as a video source;
• a light source apparatus configured to supply a light in a specific polarization direction to the display panel;
• and
• a retroreflector including a phase difference plate on a retroreflection surface, wherein
• a polarization separation member is disposed in a space between the display panel and the retroreflector,
• the polarization separation member is configured to once transmit a video light of a specific polarization from the display panel to the retroreflector, perform polarization conversion by the retroreflector and convert the video light into a video light of another polarization to cause the video light to be reflected by the polarization separation member, and display the air floating video as a real image at a side opposite to the video source in a transparent member disposed in an aperture through which the video light of the specific polarization passes, and
• the retroreflector is disposed to be inclined with respect to the display panel and disposed at a position apart from the aperture through which a retroreflection video light passes to hinder entrance of external light.

An air floating video display apparatus for forming an air floating video, comprising:

• a display panel;
• a light source apparatus configured to supply a light in a specific polarization direction to the display panel;
• and
• a retroreflector, wherein
• a light shielding member configured to block entrance of a video light flux having a divergence angle exceeding a specific angle from the display panel to the retroreflector is disposed in a space between the display panel and the retroreflector,
• a surface roughness of a reflecting surface of the retroreflector is set such that a proportion of an amount of blur l of the air floating video and a pixel size L of the display panel becomes 40% or less,
• the light source apparatus includes:
• a dotted or surface-shaped light source;
• an optical member configured to reduce a divergence angle of a light from the light source;
• a polarization conversion member configured to uniform the lights from the light sources to a polarized light in a specific direction;
• and
• a light guiding body having a reflecting surface for propagation to the display panel,
• the light guiding body is configured to adjust a divergence angle of a reflected light by a shape and surface roughness of the reflecting surface disposed on the light guiding body, and
• a video light flux having a narrow divergence angle from the display panel is reflected by the retroreflector to form the air floating video in midair.

An air floating video display apparatus for forming an air floating video, comprising:

• a display panel;
• a light source apparatus configured to supply a light in a specific polarization direction to the display panel;
• and
• a retroreflector, wherein
• a light shielding member configured to block entrance of a video light flux having a divergence angle exceeding a specific angle from the display panel to the retroreflector is disposed in a space between the display panel and the retroreflector,
• a surface roughness of a reflecting surface of the retroreflector is set such that a proportion of an amount of blur l of the air floating video and a pixel size L of the display panel becomes 40% or less,
• the light source apparatus includes:
• a dotted or surface-shaped light source;
• an optical member configured to reduce a divergence angle of light from the light source;
• a polarization conversion member configured to uniform the light from the light sources to a polarized light in a specific direction;
• and
• a light guiding body having a reflecting surface for propagation to the display panel,
• the light guiding body is disposed opposed to the display panel,
• a reflecting surface that causes the light from the light source to be reflected toward the display panel is disposed inside or on a surface of the light guiding body, and the reflecting surface causes the light in the specific polarization direction reflected by a reflective polarizing plate to pass through a surface connecting the adjacent reflecting surfaces of the light guiding body and be reflected by a reflective plate disposed at a surface opposite to a surface in contact with the display panel of the light guiding body, a polarization conversion is performed by causing the light to pass through a phase difference plate disposed on an upper surface of the reflective plate twice for conversion into a polarization passing through the reflective polarizing plate, and the light is caused to pass through the light guiding body to propagate the light to the display panel,
• the display panel modulates an optical intensity according to a video signal,
• the light source apparatus is configured to adjust a part of or all of divergence angles of video light flux that enters the display panel from the light source by a shape and surface roughness of a reflecting surface disposed on the light source apparatus, and
• a video light flux having a narrow divergence angle from the display panel is caused to be reflected by the retroreflector to form the air floating video in midair.

An air floating video display apparatus for forming an air floating video, comprising:

• a display panel;
• a light source apparatus configured to supply a light in a specific polarization direction to the display panel;
• and
• a retroreflector, wherein
• a light shielding member configured to block entrance of a video light flux having a divergence angle exceeding a specific angle from the display panel to the retroreflector is disposed in a space between the display panel and the retroreflector,
• a surface roughness of a reflecting surface of the retroreflector is set such that a proportion of an amount of blur l of the air floating video and a pixel size L of the display panel becomes 40% or less,
• the light source apparatus includes:
• a dotted or surface-shaped light source;
• an optical member configured to reduce a divergence angle of light from the light source;
• a light guiding body having a reflecting surface by which the light from the light source is reflected to propagates the light to the display panel;
• and
• a phase difference plate and a reflecting surface opposed to the other surface of the light guiding body and disposed in an order from the light guiding body,
• the reflecting surface of the light guiding body is disposed to cause the light from the light source to be reflected and propagate the light to the display panel disposed opposed to the light guiding body,
• a reflective polarizing plate is disposed between the reflecting surface of the light guiding body and the display panel,
• a polarization conversion is performed by causing the light in the specific polarization direction reflected by the reflective polarizing plate to be reflected by a reflecting surface disposed opposed to and close to the other surface of the light guiding body and pass through the phase difference plate disposed between the light guiding body and the reflecting surface twice, and the light is caused to pass through the reflective polarizing plate to propagate the light in the specific polarization direction to the display panel,
• the display panel modulates an optical intensity according to a video signal,
• the light source apparatus is configured to control a part of or all of divergence angles of light flux entering the display panel from the light source by a shape and surface roughness of a reflecting surface disposed on the light source apparatus, and
• a video light flux having a narrow divergence angle from the display panel is reflected by the retroreflector to form the air floating video in midair.

An air floating video display apparatus for forming an air floating video, comprising:

• a display panel;
• a light source apparatus configured to supply a light in a specific polarization direction to the display panel;
• and
• a retroreflector, wherein
• the light source apparatus includes:
• a dotted or surface-shaped light source;
• an optical member configured to reduce a divergence angle of light from the light source;
• a polarization conversion member configured to uniform the light from the light sources to a polarized light in a specific direction;
• and
• a light guiding body having a reflecting surface for propagation to the display panel,
• the light guiding body is disposed to be opposed to the display panel,
• a reflecting surface configured to cause the light from the light source to be reflected toward the display panel is disposed inside or on a surface of the light guiding body to propagate the light to the display panel,
• the light guiding body is configured to modulate an optical intensity according to a video signal by the display panel and adjust a part of or all of divergence angles of video light flux entering the display panel from the light source by a shape and surface roughness of the reflecting surface disposed on the light guiding body,
• the retroreflector is configured to cause a video light flux having a narrow divergence angle from the display panel to be reflected to form an air floating video in midair, and
• a shape of the retroreflector is formed in a concave surface or a convex surface having a curvature radius of 200 mm or more with respect to the display panel.

An air floating video display apparatus for forming an air floating video, comprising:

• a display panel;
• a light source apparatus configured to supply a light in a specific polarization direction to the display panel;
• a transmissive plate including a polarization separation member on a surface;
• an optical system including a retroreflector;
• a housing configured to house the display panel, the light source apparatus, the transmissive plate, and the optical system;
• and
• an outer frame that holds the transmissive plate and is coupled to the housing, wherein
• a video light of a specific polarization from the display panel is reflected by the polarization separation member, and a polarization conversion is performed on the video light on which retroreflection is performed by a phase difference plate disposed on the retroreflector, and the video light is caused to pass through the polarization separation member and the transmissive plate to form the air floating video;
• and
• the optical system is disposed in the housing such that a part of or all of the air floating video is caught by a part of or all of the outer frame when a watcher of the air floating video watches the air floating video.