Patent ID: 11921406
Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 27:
28. A projection display apparatus comprising:
a light source unit that emits light;
an image forming unit that outputs image light including first light and second light having a longer wavelength band than the first light by using the light from the light source unit;
a projection lens unit that enlarges and projects the image light output from the image forming unit onto a projection target; and
a wavelength selection filter disposed on an optical path between the image forming unit and the projection lens unit,
wherein the projection lens unit includes a plurality of lenses coated with a first antireflection coating, and
the wavelength selection filter has a first region in a center of the wavelength selection filter through which an optical axis passes and a second region around the first region, and a transmittance of the first light in the second region is lower than a transmittance of the first light in the first region.