Pancake window display system employing one or more switchable holographic optical elements
AssigneeDigiLens Inc.
InventorMilan M. Popovich
Life of this patent
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Abstract
An optical system including one or more switchable holographic optical elements is described for use with a pancake window display system. Each of the switchable holographic optical elements of the optical system operates between active and inactive states in accordance with control signals provided by a control logic circuit. In the active state, each switchable holographic optical element operates to reflect and collimate a narrow band of incident light thereon. In the inactive state, the switchable holographic optical element operates to transmit a substantial portion of light thereon without substantial alteration.
Claims15
An apparatus comprising:
- first and second linear polarizers;
- first and second quarter wave plates positioned between the first and second linear polarizers;
- a beam splitting mirror positioned between the first and second quarter wave plates, and;
- a first optical element positioned between the first linear polarizer and the first quarter wave plate, the first optical element formed from polymer dispersed liquid crystal material, wherein the first optical element is configured to transmit substantially all light incident thereon without substantial alteration when the first optical element operates in an inactive state, and wherein the first optical element is configured to alter a substantial portion of a first bandwidth of light incident thereon when the first optical element operates in an active state;
- a second optical element positioned between the first optical element and the first quarter wave plate, the second optical element formed from polymer dispersed liquid crystal material, wherein the second optical element is configured to transmit substantially all light incident thereon without substantial alteration when the second optical element operates in an inactive state, and wherein the second optical element is configured to alter light a substantial portion of a second bandwidth of light incident thereon when the second optical element operates in an active state, and;
- a third optical element positioned between the first optical element and the first quarter wave plate, the third optical element formed from polymer dispersed liquid crystal material, wherein the third optical element is configured to transmit substantially all light incident thereon without substantial alteration when the third optical element operates in an inactive state, and wherein the third optical element is configured to alter a substantial portion of a third bandwidth of light incident thereon when the third optical element operates in an active state;
- wherein the third optical element is positioned between the second optical element and the first quarter wave plate.
Dependencies are inferred from the claim text.