Projection device having an increased efficiency
First Claim
1. A projection device for projecting an image comprising a light source for emitting light, a transmissive LCD projection subsystem and a projection means for projecting the image, said projection subsystem comprising:
- a waveguide integrator for guiding light from an entrance to an exit, the inner entrance surface of said integrator being coated with a reflective material and having a hole for coupling light emitted from said light source into said integrator, a reflective polarizer provided at the exit surface of said integrator for reflecting light having the wrong polarization back into said integrator, a transmissive LCD provided at the exit of said reflective polarizer for modulating the light transmitted by said polarizer, said LCD having an integrated reflective color filter array for reflecting light having the wrong color back into said integrator.
1 Assignment
0 Petitions
Accused Products
Abstract
The invention relates to a projection device for projecting an image, comprising a light source (1), a LCD projection subsystem (3) and a projection means (4, 5) for projecting the image. A small-sized and low-cost projection device is porposed wherein said projection subsystem comprises: a waveguide integrator (30) for guiding light from an entrance (31) to an exit (34), the inner entrance surface (33) of said integrator (30) being coated with a reflective material and having a hole (32) for coupling light emitted from said light source (1) into said integrator (30), a reflective polarizer (35) provided at the exit surface (34) of said integrator (30) for reflecting light having the wrong polarization backinto said integrator (30), a transmissive LCD (36) provided at the exit of said reflective polarizer (35) for modulating the light transmitted by said polarizer (35), said LCD (36) having an integrated reflective color filter array (37) for reflecting light having the wrong color back into said integrator (30).
-
Citations
10 Claims
-
1. A projection device for projecting an image comprising a light source for emitting light, a transmissive LCD projection subsystem and a projection means for projecting the image, said projection subsystem comprising:
-
a waveguide integrator for guiding light from an entrance to an exit, the inner entrance surface of said integrator being coated with a reflective material and having a hole for coupling light emitted from said light source into said integrator, a reflective polarizer provided at the exit surface of said integrator for reflecting light having the wrong polarization back into said integrator, a transmissive LCD provided at the exit of said reflective polarizer for modulating the light transmitted by said polarizer, said LCD having an integrated reflective color filter array for reflecting light having the wrong color back into said integrator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method of projecting an image, the method comprising the steps of:
-
emitting light using a light source, guiding light received from said light source at an entrance to an exit, using a waveguide integrator, the inner entrance surface of said integrator being coated with a reflective material and having a hole for coupling light emitted from said light source into said integrator, reflecting light having the wrong polarization back into said integrator, using a reflective polarizer provided at the exit surface of said integrator, modulating the light transmitted by said polarizer, using a transmissive LCD provided at the exit of said reflective polarizer, said LCD having an integrated reflective color filter array for reflecting light having the wrong color back into said integrator.
-
Specification