Optical device, retinal projection display, and head-mounted display
An optical device includes: a light source to emit light; a light scanner to deflect the light emitted from the light source to scan an image formation object with the light through a light deflector; the light deflector to deflect the light emitted from the light scanner to the image formation object; a reflector between the light scanner and the image formation object; and a controller to control the light deflector to deflect the light emitted from the light scanner in a deflection direction and the light scanner to deflect the light emitted from the light source in a deflection direction different from the deflection direction of the light deflector.
1 . An optical device, comprising:
a light source to emit light;
a light scanner to deflect the light emitted from the light source to scan an image formation object with the light through a light deflector;
the light deflector to deflect the light emitted from the light scanner to the image formation object;
a reflector between the light scanner and the image formation object, wherein the reflector includes a plurality of projection regions arranged in an array on a surface of the reflector along a first direction and a second direction orthogonal to the first direction, and the light scanner scans the light within one projection region of the plurality of projection regions; and
circuitry configured to:
control the light deflector to deflect the light emitted from the light scanner in a first deflection direction, and to shift a position of the light from one projection region of the plurality of projection regions to another projection region of the projection regions along the first direction; and
control the light scanner to deflect the light emitted from the light source in a second deflection direction different from the first deflection direction, and to shift the position of the light from one projection region of the plurality of projection regions to another projection region of the projection regions along the second direction.
2 . The optical device according to claim 1 , wherein the circuitry controls the light scanner and the deflection direction to change the first deflection direction and the second deflection direction to form a non-projection region on the plurality of projection regions.
3 . The optical device according to claim 1 , wherein the reflector includes a light reflecting-condensing element in each projection region of the plurality of projection regions, the light reflecting-condensing element configured to reflect and condense light.
4 . The optical device according to claim 3 , wherein the light reflecting-condensing element is a hologram.
5 . The optical device according to claim 1 , wherein the light scanner scans the image formation object with the light to form different images on the image formation object.
6 . The optical device according to claim 1 , further comprising:
projection position output circuitry configured to output at least one of positional information of projection and positional information of the image formation object to the circuitry, wherein
the circuitry controls the light scanner and the light deflector based on the at least one of the positional information of projection and the positional information of the image formation object.
7 . The optical device according to claim 1 , further comprising:
projection information output circuitry configured to output projection information to the light source.
8 . The optical device according to claim 1 , further comprising:
a detector to detect a sight-line-direction, wherein
the image formation object is at least one of a retina and a pupil of the eyeball, and
at least one of the light scanner and the light deflector deflects the light based on the sight-line-direction.
9 . The optical device according to claim 8 , wherein the circuitry adjusts a drive voltage of at least one of the light scanner and the light deflector to control the at least one of the light scanner and the light deflector.
10 . The optical device according to claim 1 , wherein to control the light deflector, the circuitry is configured to:
apply a first drive voltage to the light deflector;
apply a second drive voltage to the light deflector; and
change an amount of time between a timing at which a voltage value of the first drive voltage is adjusted and a timing at which a voltage value of the second drive voltage is adjusted.
11 . A retinal projection display comprising the optical device according to claim 1 .
12 . A head-mounted display comprising the optical device according to claim 1 .