Retinal image display device

A retinal image scanning device, comprising:

• at least one light source that emits a light beam;
• an intensity modulating system that modulates the intensity of the light beam emitted by said at least one light source in accordance with a video signal;
• an optical system that directs the light beam to a pupil of an observer;
• a scanning system that scans the light beam in a first direction and in a second direction which is substantially perpendicular to the first direction so that a two-dimensional image frame defined by the first and second directions is periodically formed on a retinal of the observer;
• and
• a wavefront curvature modulating system that modulates a wavefront curvature of the light beam,
• wherein said wavefront curvature modulating system operates such that the wavefront curvature of the light beam forming the same image frame is substantially constant, the wavefront curvature of the light beam being changed only when frame image is switched to another frame.

A retinal image scanning device, comprising:

• at least one light source that emits a light beam;
• an intensity modulating system that modulates the intensity of the light beam emitted by said at least one light source in accordance with a video signal;
• an optical system that directs the light beam to a pupil of an observer;
• a scanning system that scans the light beam in a first direction and in a second direction which is substantially perpendicular to the first direction so that a two-dimensional image frame defined by the first and second directions is formed on a retinal of the observer;
• a synchronizing signal generating system that outputs a first synchronizing signal having a first frequency and a second synchronizing signal having a second frequency, said scanning system scans the light beam in the first direction and in the second direction synchronously with the first and second synchronizing signals, respectively;
• and
• a wavefront curvature modulating system that modulates a wavefront curvature of the light beam synchronously with the first synchronizing signal when the light beam is scanned in the first direction.