IP Library › Granted Patent US 7,298,558
Granted Patent B2
US 7,298,558 · App. 11/240,875 · Granted Nov 20, 2007

Electronic adjustable color filter device

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Quick Facts
Patent No.
US 7,298,558
App. No.
11/240,875
Granted
Nov 20, 2007
Kind
B2
Abstract

An electronically adjustable, combinational color filter device is provided for generating color light. Incoming light is split in a polarizing beam splitter/combiner into a first and a second element of light. One or more wave plates operate to modify the polarization state of the first element of light, and one or more dichroic reflective filters reflect portions of the first element of light having a predetermined wavelength. Similarly, one or more wave plates operate to modify the polarization state of the second element of light, and one or more dichroic reflective filters reflect portions of the second element of light having a predetermined wavelength. Reflected portions of the first element and the second elements of light are combined in the polarizing beam splitter/combiner to create color light. A spatial light modulator may be used to create color images.

Claims (11)

1. A method for generating color light comprising:

receiving incoming light into a polarizing beam splitter/combiner;

splitting the incoming light into a first element of light having a first polarization state and a second element of light having a second polarization state;

selectively passing the first element of light through a first plurality of wave plates to alter the polarization state of the first element of light;

selectively reflecting the first element of light off a first plurality of dichroic reflective filters, each filter reflecting a portion of the first element of light having a predetermined wavelength;

selectively passing the second element of light through a second plurality of wave plates to alter the polarization state of the second element of light;

selectively reflecting the second element of light off a second plurality of dichroic reflective filters, each filter reflecting a potion of the second element of light having a predetermined wavelength; and

combining, in the polarizing beam splitter/combiner, reflected portions of the first element of light and reflected portions of the second element of light, to generate color light.

2. The method of claim 1 , wherein the first plurality of wave plates and the second plurality of wave plates are the same wave plates.

3. The method of claim 2 , further comprising reflecting light passing through each wave plate off a mirror.

4. The method of claim 1 , further comprising creating an image using a spatial light modulator optically aligned with the generated color light.