Laser illuminated projection displays

A projection display, comprising:

• a spatial light modulator;
• first, second, and third lasers for generating and delivering respectively a red light beam, a green light beam and a blue light beam, at least one of said first, second, and third lasers being an optically pumped semiconductor laser;
• an optical arrangement for delivering said red, green and blue light beams to said spatial light modulator, said spatial light modulator being arranged to amplitude modulate said red, green and blue light beams in accordance with red, green, and blue components of an image to be displayed;
• a time modulation arrangement for periodically interrupting delivery of said red, green, and blue light beams to said spatial light modulator in a manner such that said light beams are received and spatially modulated separately by said spatial light modulator;
• and
• wherein said time modulation arrangement includes periodically interrupting said optical pumping of said optically pumped semiconductor laser, thereby periodically interrupting generation of said light beam provided thereby.

A projection display, comprising:

• first, second, and third lasers for generating and delivering respectively a red light beam, a green light beam and a blue light beam, at least one of said first, second, and third lasers being an optically pumped semiconductor laser, and each of said beams having an original beam divergence;
• an optical arrangement for directing said red, blue, and green, beams along a common path;
• a first lens;
• a scanning arrangement for scanning said red, green and blue beams in said common path in a particular pattern over said first lens, such that averaged over time each of said beams has an apparent beam divergence greater than said original divergence thereof, said first lens being arranged to direct said scanned beams into a beam homogenizer;
• a spatial light modulator, said spatial light modulator arranged to receive said red green and blue light beams homogenized by said beam homogenizer spatially modulate said homogenized beams in accordance with a red, green or blue portion of an image to be displayed;
• and
• projection optics for projecting said homogenized, spatially modulated, red, green, and blue beams onto a screen on which said image is to be displayed.

A projection display, comprising:

• first, second, and third lasers for generating and delivering respectively a red light beam, a green light beam and a blue light beam, at least one of said first, second, and third lasers being an optically pumped semiconductor laser, and each of said beams having an original beam divergence;
• an optical arrangement for directing said red, blue, and green, beams along a common path;
• a first lens;
• a scanning arrangement for scanning said red, green and blue beams in said common path in a particular pattern over said first lens, such that averaged over time, each of said beams has an apparent beam divergence greater than said original divergence thereof, said first lens being arranged to direct said scanned beams into a beam homogenizer;
• a spatial light modulator, said spatial light modulator arranged to receive said red green and blue light beams homogenized by said beam homogenizer spatially modulate said homogenized beams in accordance with a red, green or blue portion of an image to be displayed;
• a screen for displaying said image;
• projection optics for projecting said homogenized, spatially modulated, red, green, and blue beams onto said screen;
• and
• wherein said screen includes a transparent sheet having a plurality of raised surfaces features for directing light in said beams incident thereon in a plurality of directions, each of said features having a dimension that is greater than the coherence radius of said light on said screen but is not resolvable by a viewer at normal viewing distance from said screen.

A projection display, comprising:

• first, second, and third lasers for generating and delivering respectively a red light beam, a green light beam and a blue light beam, at least one of said first, second, and third lasers being an optically pumped semiconductor laser, and each of said beams having an original beam divergence;
• an optical arrangement for directing said red, blue, and green, beams along a common path;
• a first lens;
• a scanning arrangement for scanning said red, green and blue beams in said common path in a particular pattern over said first lens, such that averaged over time each of said beams has an apparent beam divergence greater than said original divergence thereof, said first lens being arranged to direct said scanned beams into a beam homogenizer;
• a spatial light modulator, said spatial light modulator arranged to receive said red green and blue light beams homogenized by said beam homogenizer spatially modulate said homogenized beams in accordance with a red, green or blue portion of an image to be displayed;
• a screen for displaying said image;
• projection optics for projecting said homogenized, spatially modulated, red, green, and blue beams onto said screen;
• and
• wherein said screen includes a transparent cell containing a liquid having a plurality of particles in suspension therein said particles being sufficiently small to scatter light from said red, green and blue beams and being in continuous random motion with respect to each other while said image is being displayed.