US 12,279,078 B2
Projection apparatus
Shang-Wei Chen, Hsin-Chu (TW); and Ming-Tsung Weng, Hsin-Chu (TW)
Assigned to Coretronic Corporation, Hsin-Chu (TW)
Filed by Coretronic Corporation, Hsin-Chu (TW)
Filed on Dec. 20, 2023, as Appl. No. 18/389,799.
Claims priority of application No. 202211649662.2 (CN), filed on Dec. 21, 2022.
Prior Publication US 2024/0214530 A1, Jun. 27, 2024
Int. Cl. H04N 9/31 (2006.01)
CPC H04N 9/3152 (2013.01) [H04N 9/3105 (2013.01); H04N 9/3155 (2013.01); H04N 9/3158 (2013.01); H04N 9/3164 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A projection apparatus, comprising:
an illumination system, comprising:
a blue light emitting element, configured to emit a blue beam;
a red light emitting element, configured to emit a red beam;
a wavelength conversion device, comprising a reflection area and a wavelength conversion area, wherein the reflection area and the wavelength conversion area are located on a transmission path of the blue beam in time sequence, and the wavelength conversion area is configured to convert the blue beam into a green beam;
a dichroic assembly, disposed between the blue light emitting element and the wavelength conversion device;
a first light diffusing element, disposed between the red light emitting element and the dichroic assembly; and
a second light diffusing element, disposed on transmission paths of the blue beam, the red beam and the green beam from the dichroic assembly, the second light diffusing element having a diffusion area and a non-diffusion area, an angle of the non-diffusion area relative to a central axis of the second light diffusing element being greater than an angle of the diffusion area relative to the central axis of the second light diffusing element, the diffusion area being located on the transmission path of the blue beam, and the non-diffusion area being located on a transmission path of the green beam;
a prism assembly, disposed on transmission paths of the red beam, the green beam and the blue beam from the second light diffusing element, and having a dichroic film;
a first light valve, wherein the dichroic film is configured to transmit the red beam to the first light valve, and the first light valve is configured to convert the red beam into a first image beam;
a second light valve, wherein the dichroic film is configured to transmit the green beam and the blue beam to the second light valve, and the second light valve is configured to convert the green beam and the blue beam into a second image beam and a third image beam; and
a projection lens, disposed on a transmission path of an image beam, and configured to project the image beam out of the projection apparatus, wherein the image beam comprises at least one of the first image beam, the second image beam and the third image beam.