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System and method for modulating light intesity

  • US 20020126332A1
  • Filed: 09/19/2001
  • Published: 09/12/2002
  • Est. Priority Date: 09/14/1998
  • Status: Abandoned Application
First Claim
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1. An image projection system comprising a first set of red, green, and blue light sources for generating first red, green, and blue bandwidth lights, respectively;

  • a first set of red, green, and blue bandwidth sensitive switchable holographic optical elements;

    a circuit coupled to the first set of red, green, and blue bandwidth sensitive switchable holographic optical elements, wherein the circuit is configured to receive first red, green, and blue pixel component digital signals, wherein the control circuit generates first red, green, and blue pixel component analog voltages in response to receiving the first red, green, and blue pixel component digital signals, respectively, wherein the magnitudes of the first red, green, and blue pixel component analog voltages depend on the first red, green, and blue pixel component digital signals, respectively;

    wherein the first set of red, green, and blue bandwidth sensitive switchable holographic optical elements diffract portions of the first red, green, and blue bandwidth lights, respectively, in response to receiving the first red, green, and blue pixel component analog voltages, respectively, wherein the diffracted portions of the first red, green, and blue bandwidth lights emerge from the first set of red, green, and blue bandwidth sensitive switchable holographic optical elements, respectively, as first red, green, and blue output lights, respectively, and wherein undiffracted portions of the first red, green, and blue bandwidth lights emerge from the first set of red, green, and blue bandwidth sensitive switchable holographic optical elements, respectively, as second red, green, and blue output lights, respectively;

    wherein the intensities of the first red, green, and blue bandwidth output lights are inversely proportional to the magnitudes of the first red, green, and blue pixel component analog voltages, respectively, and wherein the intensities of the second red, green, and blue bandwidth output lights are proportional to the magnitudes of the first red, green, and blue pixel component analog voltages, respectively;

    a light deflection device configured to receive the first red, green, and blue bandwidth output lights or the second red, green, and blue bandwidth output lights, wherein the light deflection device is configured to deflect the received first red, green, and blue bandwidth output lights or the received second red, green, and blue bandwidth output lights onto one of a first plurality of areas on a display surface.

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