Holographic pattern generation for head-mounted display (HMD) eye tracking using a lens array

A system for making a holographic medium for use in generating light patterns for eye tracking, the system including:

• a light source configured to provide light;
• a beam splitter configured to separate the light into a first portion of the light and a second portion of the light that is spatially separated from the first portion of the light;
• a first set of optical elements configured to transmit the first portion of the light for providing a first wide-field beam onto an optically recordable medium;
• a second set of optical elements configured to transmit the second portion of the light through for providing a second wide-field beam;
• a plurality of lenses optically coupled with the second set of optical elements configured to receive the second wide-field beam and project a plurality of separate light patterns onto the optically recordable medium for forming the holographic medium;
• and
• a condenser lens that is distinct from the plurality of lenses and optically coupled with the plurality of lenses.

A method for making a holographic medium for use in generating light patterns for eye tracking, the method including:

• providing light from a light source;
• separating the light into a first portion of the light and a second portion of the light that is spatially separated from the first portion of the light;
• transmitting the first portion of the light through a first set of optical elements to provide a first wide-field beam;
• transmitting the second portion of the light through a second set of optical elements to provide a second wide-field beam that is spatially separated from the first wide-field beam onto an optically recordable medium;
• transmitting the second wide-field beam through a plurality of lenses to provide a plurality of separate light patterns;
• and
• concurrently projecting the first wide-field beam and the plurality of separate light patterns onto the optically recordable medium to form the holographic medium;
• and
• projecting, with a first lens of the plurality of lenses, a first light pattern of the plurality of separate light patterns onto the optically recordable medium at a first angle, and projecting, with a second lens of the plurality of lenses, a second light pattern of the plurality of separate light patterns onto the optically recordable medium at a second angle that is distinct from the first angle.