Picture generation apparatus, projection apparatus, and vehicle
View Patent ↗A picture generation apparatus includes at least a light source assembly, a spatial light modulation assembly, a beam adjustment assembly and a lens assembly. The light source assembly is configured to generate a first beam. The spatial light modulation assembly is configured to modulate the first beam to generate a picture beam. The lens assembly is configured to project the picture beam onto a projection surface to display a target picture. The beam adjustment assembly is disposed in the lens assembly or on an optical path between the light source assembly and the spatial light modulation assembly, and is configured to adjust a light amount of the first beam, to adjust brightness of the target picture.
1 . A picture generation apparatus comprising:
a light source assembly configured to generate a light beam;
a spatial light modulation assembly configured to modulate the light beam to generate a picture beam;
a lens assembly configured to project the picture beam onto a projection surface to display a target picture;
a light homogenizing assembly disposed on a first optical path between the light source assembly and the spatial light modulation assembly and configured to perform light homogenization on the light beam generated by the light source assembly; and
a beam adjustment assembly disposed on a second or third optical path, and configured to adjust a light amount of the light beam to adjust brightness of the target picture,
wherein the second optical path is between the light source assembly and the light homogenizing assembly, and
wherein the third optical path is between the light homogenizing assembly and the spatial light modulation assembly.
2 . The picture generation apparatus according to claim 1 , wherein the beam adjustment assembly comprises a control element and an adjustable aperture stop element, and the control element controls a size of a light transmission hole of the adjustable aperture stop element to adjust the light amount of the light beam.
3 . The picture generation apparatus according to claim 2 , wherein the light transmission hole of the adjustable aperture stop element is a circular light transmission hole or a rectangular light transmission hole.
4 . The picture generation apparatus according to claim 1 , wherein the light homogenizing assembly is a compound eyes lens.
5 . The picture generation apparatus according to claim 1 , wherein the spatial light modulation assembly is a reflective spatial light modulation assembly.
6 . The picture generation apparatus according to claim 5 , wherein the reflective spatial light modulation assembly is a liquid crystal on silicon (LCOS) assembly, and the picture generation apparatus further comprises:
a polarization beamsplitter element disposed on a fourth optical path between the light source assembly and the LCOS assembly, and configured to reflect a second beam of S-polarized light to the LCOS assembly, and transmit a third beam of P-polarized light to the lens assembly.
7 . The picture generation apparatus according to claim 6 , wherein the picture generation apparatus further comprises:
a polarized light conversion element disposed on a fifth optical path between the light source assembly and the polarization beamsplitter element, and configured to modulate the light beam into the second beam of the S-polarized light.
8 . The picture generation apparatus according to claim 5 , wherein the reflective spatial light modulation assembly is a digital micromirror display (DMD) assembly, and the picture generation apparatus further comprises:
a first collimation lens element disposed between the light source assembly and the DMD assembly, and configured to collimate the light beam; and
a reflector element disposed between the first collimation lens element and the DMD assembly, and configured to reflect, to the DMD assembly, a beam collimated by the first collimation lens element.
9 . The picture generation apparatus according to claim 6 , wherein the LCOS assembly comprises a rectangular LCOS panel; and
an extension direction of a short side of the rectangular LCOS panel is parallel to an incident surface, and the incident surface is a plane determined by an incident beam and a reflected beam of the polarization beamsplitter element.
10 . The picture generation apparatus according to claim 1 , wherein the light source assembly comprises:
a red light emitting diode (LED) element configured to generate a red beam;
a green LED element configured to generate a green beam;
a first blue LED element configured to generate a first blue beam;
a second blue LED element disposed opposite to the first blue LED element to generate a second blue beam;
a first dichroic mirror element disposed on a first transmission path of the green beam, a second transmission path of the first blue beam, and a third transmission path of the second blue beam, and configured to reflect the first blue beam to the green LED element, and transmit the green beam and reflect the second blue beam onto the first transmission path of the green beam to form a mixed beam; and
a second dichroic mirror element disposed on a fourth transmission path of the red beam and a fifth transmission path of the mixed beam, and configured to transmit the mixed beam, and reflect the red beam onto the fifth transmission path of the mixed beam to form the first beam.
11 . The picture generation apparatus according to claim 10 , wherein the light source assembly further comprises:
a second collimation lens element disposed on the fifth transmission path of the mixed beam, and configured to collimate the mixed beam to the second dichroic mirror element.
12 . The picture generation apparatus according to claim 1 , wherein the beam adjustment assembly comprises:
a controllably adjustable aperture stop configured to vary an aperture size to actively control an amount of light supplied toward the spatial light modulation assembly,
wherein adjustment of brightness of the target picture is performed by varying the aperture size without varying a brightness of the light beam generated by the light source assembly.
13 . A vehicle comprising:
a picture generation apparatus comprising:
a light source assembly configured to generate a light beam;
a spatial light modulation assembly configured to modulate the light beam to generate a picture beam;
a lens assembly configured to project the picture beam onto a projection surface to display a target picture;
a light homogenizing assembly disposed on a first optical path between the light source assembly and the spatial light modulation assembly and configured to perform light homogenization on the light beam generated by the light source assembly; and
a beam adjustment assembly disposed on a second or third optical path, and configured to adjust a light amount of the light beam to adjust brightness of the target picture,
wherein the second optical path is between the light source assembly and the light homogenizing assembly, and
wherein the third optical path is between the light homogenizing assembly and the spatial light modulation assembly.
14 . The vehicle according to claim 13 , wherein the beam adjustment assembly comprises a control element and an adjustable aperture stop element, and the control element controls a size of a light transmission hole of the adjustable aperture stop element to adjust the light amount of the light beam.
15 . The vehicle according to claim 14 , wherein the light transmission hole of the adjustable aperture stop element is a circular light transmission hole or a rectangular light transmission hole.
16 . A method for generating a picture, the method comprising:
modulating a light beam to generate a picture beam;
projecting the picture beam onto a projection surface to display a target picture;
adjusting a light amount in a first or a second optical path of the light beam to adjust brightness of the target picture,
wherein the first optical path is between a light source assembly and a light homogenizing assembly, and
wherein the second optical path is between a light homogenizing assembly and a spatial light modulation assembly;
detecting brightness of an environment in which the projection surface is located; and
using the detected brightness of the environment in adjusting the light amount in the first or the second optical path of the light beam.
17 . The method according to claim 16 , wherein the method further includes controlling a size of a light transmission hole of an adjustable aperture stop element to adjust the light amount of the light beam.
18 . The method according to claim 17 , wherein controlling a size of a light transmission hole of the adjustable aperture stop element is based on the brightness of the environment in which the projection surface is located to adjust the brightness of the target picture.
19 . The method according to claim 17 , wherein the light transmission hole of the adjustable aperture stop element is a circular light transmission hole or a rectangular light transmission hole.
20 . The method according to claim 16 , wherein the method includes performing light homogenization on the light beam.