Projection device, projection control method, and recording medium
AssigneeNEC Platforms, Ltd.
InventorFujio Okumura
Life of this patent
Estimating the term…
Abstract
A projection device includes a light source, spatial light modulator, a control unit, and a shield. The spatial light modulator has a modulation part that modulates the phase of light emitted from the light source. The control unit divides the modulation part of the spatial light modulator into at least two regions and sets phase images of the target image in these regions. The light source is controlled to emit light onto the modulation parts with the phase images. The shield allows light from the image region for the desired image to pass through as projection light while blocking light from an unnecessary region, including ghost images.
Claims9
A projection device comprising:
- a light source;
- a spatial light modulator that includes a modulation part that is irradiated with light emitted from the light source and that modulates a phase of the light with which the modulation part is irradiated;
- a controller comprising:
- a memory storing instructions;
- and
- a processor connected to the memory and configured to execute the instructions to:
- allocate at least two modulation regions to the modulation part of the spatial light modulator;
- set phase images of at least two images constituting a target image on a face to be projected in the at least two respective modulation regions;
- and
- control the light source in such a way that the modulation part in which the phase images of the at least two images are set is irradiated with the light;
- a shield that is disposed on an optical path of modulated light modulated by the modulation part of the spatial light modulator and that is configured to transmit a light component in an image region where a desired image is formed as projection light and shield a light component in an unnecessary region including a ghost image of the desired image of the modulated light modulated in each of the at least two modulation regions set in the modulation part of the spatial light modulator;
- and
- a curved surface mirror that includes a curved reflecting surface irradiated with the modulated light modulated by the modulation part of the spatial light modulator, is disposed on an optical path of a light component of the image region forming the desired image, the light component having passed through the shield, of the modulated light modulated by the modulation part of the spatial light modulator, reflects the light component of the image region by the curved reflecting surface, and projects the projection light having a projection angle enlarged according to a curvature of the reflecting surface,
- wherein the processor of the controller is configured to execute the instructions to:
- allocate a first modulation region and a second modulation region to the modulation part of the spatial light modulator;
- and
- set phase images of a first image and a second image constituting the target image in the first modulation region and the second modulation region, respectively,
- wherein the shield is disposed at a position at which a light component of the unnecessary region included in the modulated light modulated in each of the first modulation region and the second modulation region is shielded, and
- wherein the processor of the controller is configured to execute the instructions to:
- set, in the first modulation region, a composite image obtained by combining a phase image of the first image constituting the target image and a virtual lens image condensing the modulated light forming the first image at a position of the reflecting surface of the curved surface mirror;
- and
- set, in the second modulation region, a composite image obtained by combining a phase image of the second image forming the target image and the virtual lens image condensing the modulated light forming the second image at a position of the reflecting surface of the curved surface mirror.
A projection control method of controlling a projection device including a light source, a spatial light modulator that includes a modulation part that is irradiated with light emitted from the light source and that modulates a phase of the light with which the modulation part is irradiated, and a shield that is disposed on an optical path of modulated light modulated by the modulation part of the spatial light modulator and that is configured to transmit a light component in an image region where a desired image is formed as projection light and shield a light component in an unnecessary region including a ghost image of the desired image of the modulated light modulated by the modulation part of the spatial light modulator, the projection control method comprising:
- allocating at least two modulation regions to the modulation part of the spatial light modulator;
- setting phase images of at least two images constituting a target image on a face to be projected in the at least two respective modulation regions;
- and
- controlling the light source in such a way that the modulation part in which the phase images of the at least two images are set is irradiated with the light,
- wherein the projection device further includes a curved surface mirror that includes a curved reflecting surface irradiated with the modulated light modulated by the modulation part of the spatial light modulator, is disposed on an optical path of a light component of the image region forming the desired image, the light component having passed through the shield, of the modulated light modulated by the modulation part of the spatial light modulator, reflects the light component of the image region by the reflecting surface, and projects the projection light having a projection angle enlarged according to a curvature of the reflecting surface,
- wherein the projection control method further comprises:
- allocating a first modulation region and a second modulation region to the modulation part of the spatial light modulator;
- and
- setting phase images of a first image and a second image constituting the target image in the first modulation region and the second modulation region, respectively,
- wherein the shield is disposed at a position at which a light component of the unnecessary region included in the modulated light modulated in each of the first modulation region and the second modulation region is shielded, and
- wherein the projection control method further comprises:
- setting, in the first modulation region, a composite image obtained by combining a phase image of the first image constituting the target image and a virtual lens image condensing the modulated light forming the first image at a position of the reflecting surface of the curved surface mirror;
- and
- setting, in the second modulation region, a composite image obtained by combining a phase image of the second image forming the target image and the virtual lens image condensing the modulated light forming the second image at a position of the reflecting surface of the curved surface mirror.
A non-transitory recording medium storing a program for controlling a projection device including a light source, a spatial light modulator that includes a modulation part that is irradiated with light emitted from the light source and that modulates a phase of the light with which the modulation part is irradiated, and a shield that is disposed on an optical path of modulated light modulated by the modulation part of the spatial light modulator and that is configured to transmit a light component in an image region where a desired image is formed as projection light and shield a light component in an unnecessary region including a ghost image of the desired image of the modulated light modulated by the modulation part of the spatial light modulator, the program causing a computer to execute operations comprising:
- allocating at least two modulation regions to the modulation part of the spatial light modulator;
- setting phase images of at least two images constituting a target image on a face to be projected in the at least two respective modulation regions;
- and
- controlling the light source in such a way that the modulation part in which the phase images of the at least two images are set is irradiated with the light,
- wherein the projection device further includes a curved surface mirror that includes a curved reflecting surface irradiated with the modulated light modulated by the modulation part of the spatial light modulator, is disposed on an optical path of a light component of the image region forming the desired image, the light component having passed through the shield, of the modulated light modulated by the modulation part of the spatial light modulator, reflects the light component of the image region by the reflecting surface, and projects the projection light having a projection angle enlarged according to a curvature of the reflecting surface,
- wherein the program further causes the computer to execute operations comprising:
- allocating a first modulation region and a second modulation region to the modulation part of the spatial light modulator;
- and
- setting phase images of a first image and a second image constituting the target image in the first modulation region and the second modulation region, respectively,
- wherein the shield is disposed at a position at which a light component of the unnecessary region included in the modulated light modulated in each of the first modulation region and the second modulation region is shielded, and
- wherein the program further causes the computer to execute operations comprising:
- setting, in the first modulation region, a composite image obtained by combining a phase image of the first image constituting the target image and a virtual lens image condensing the modulated light forming the first image at a position of the reflecting surface of the curved surface mirror;
- and
- setting, in the second modulation region, a composite image obtained by combining a phase image of the second image forming the target image and the virtual lens image condensing the modulated light forming the second image at a position of the reflecting surface of the curved surface mirror.
Dependencies are inferred from the claim text.