Device for projecting an image formed by a screen

A device for projecting an image onto an eye, the device comprising:

• a light emitter, configured to emit light waves along various respective emission axes;
• an optical combiner, optically coupled to the light emitter, and configured to form, from each light wave emitted by the light emitter, a collimated light wave that propagates towards a pupil of the eye;
• wherein:
• the light emitter comprises a directional screen, comprising various pixels, each pixel being configured to emit a divergent light wave that propagates around an emission axis of the pixel, the various pixels emitting respective divergent light waves that propagate along various emission axes, respectively, each light wave propagating such as to make a divergence angle of the pixel to the emission axis of the pixel;
• the optical combiner is configured to receive each light wave emitted by a pixel and to form a collimated light wave that propagates towards a central position corresponding to the centre of the pupil of the eye;
• the device comprises a convergent lens interposed between the directional screen and the optical combiner, the convergent lens extending around a centre, the centre of the lens forming, with a centre of the combiner, an optical axis of the device;
• wherein
• the image of the directional screen, as generated by the convergent lens, is formed in an object focal plane of the optical combiner;
• the image of the centre of the convergent lens, as generated by the combiner, is formed at the central position;
• so that the collimated light wave, resulting from the combiner, reaches the central position at an angle dependent on the position of the pixel of the screen;
• and wherein
• the respective emission axes of the pixels converge to the centre of the convergent lens.