Variable emission period for scanned-beam display

A scanned-beam display configured to form a display image within a display frame, the scanned-beam display comprising:

• an emitter configured to emit light of a controlled variable intensity;
• a beam-steering optic configured to receive and steer the light to a controlled variable beam position;
• and
• coupled operatively to the emitter and to the beam-steering optic, a drive circuit configured to:
• apply a control signal to the beam-steering optic to move the beam position along a path of pixel positions, the path including a first pixel position at a center of the display frame and a second pixel position at a periphery of the display frame, and
• drive a series of current pulses through the emitter in synchronicity with the control signal, to illuminate the first pixel position during a first interval and to equivalently illuminate the second pixel position during a second interval, the emitter being driven at a higher duty cycle during the second interval than during the first interval.

A scanned-beam display system configured to form a display image in a field-of-view of a user, the scanned-beam display system comprising:

• a sensor providing an output responsive to displacement of the field-of-view relative to a display frame of the scanned-beam display device;
• logic coupled operatively to the sensor and configured to relate each portion of the field of view to a corresponding portion of the display frame;
• an emitter configured to emit light of a controlled variable intensity;
• a beam-steering optic configured to receive and steer the light to a controlled variable beam position;
• and
• coupled operatively to the emitter and to the beam-steering optic, a drive circuit configured to:
• apply a control signal to the beam-steering optic to move the beam position along a path of pixel positions, the path including a first pixel position at a center of the field of view and a second pixel position at a periphery of the field-of view, and
• drive a series of current pulses through the emitter in synchronicity with the control signal, to illuminate the first pixel position during a first interval and to equivalently illuminate the second pixel position during a second interval, the emitter being driven at a higher duty cycle during the second interval than during the first interval.