Image projector

An image projector for projecting a collimated image via an exit stop for injection into an input stop of a light-guide optical element, said collimated image being a representation of a digital image with a field of view, the image projector comprising:

• (a) an illumination arrangement comprising a plurality of illumination sources of different colors;
• (b) a tilt-mirror assembly comprising a mirror and a driver for driving tilt motion of said mirror between a plurality of positions;
• (c) a spatial light modulator having individually controlled pixel elements;
• (d) a controller in electronic connection with said spatial light modulator and said driver;
• and
• (e) an optical arrangement comprising a plurality of optical elements, said optical arrangement being configured to:
• (i) direct illumination from said plurality of illumination sources towards said mirror;
• (ii) direct the illumination reflected from said mirror towards said spatial light modulator such that illumination from one of said illumination sources illuminates said spatial light modulator;
• and
• (iii) collimate illumination from said spatial light modulator to generate a collimated image directed to said exit stop,
• wherein said controller drives said driver to displace said mirror between a first of said positions, in which said spatial light modulator is fully illuminated by a first of said illumination sources, and a second of said positions, in which said spatial light modulator is fully illuminated by a second of said illumination sources, thereby switching between colors of illumination, said controller actuating said spatial light modulator synchronously with switching between colors of illumination to generate corresponding content of the digital image for each of the colors of illumination.

An image projector for projecting a collimated image via an exit stop onto an entrance stop of a light-guide optical element, said collimated image being a representation of a digital image with a field of view, the image projector comprising:

• (a) an illumination arrangement comprising at least one illumination source;
• (b) a first tilt-mirror assembly comprising a first mirror and a first driver for driving tilt motion of said first mirror about a first tilt axis;
• (c) a second tilt-mirror assembly comprising a second mirror and a second driver for driving tilt motion of said second mirror about a second tilt axis;
• (d) a controller in electronic connection with said first and second drivers and with said illumination arrangement;
• and
• (e) an optical arrangement comprising a plurality of optical elements deployed to:
• (i) direct illumination from said at least one illumination source towards said first mirror;
• (ii) direct the illumination reflected from said mirror towards said second mirror;
• and
• (iii) collimate illumination from said second mirror to generate a collimated image directed to said exit stop,
• wherein said controller modulates an intensity of said at least one illumination source synchronously with said tilt motion of said first and second mirrors according to the content of the digital image,
• and wherein said optical arrangement is configured such that both said first mirror and said second mirror are located substantially in planes containing an image of the entrance stop of the light-guide optical element.