Nighttime heads up display unit apparatuses, systems, and methods

A method to optically fuse first output light emitted from a waveguide display with second output light emitted from a night vision device, comprising:

• generating emitted light from a display, wherein the generating is responsive to a display input signal containing visual data;
• coupling the emitted light into the waveguide display to provide the first output light emitted from the waveguide display;
• and
• fusing the first output light with the second output light as the second output light passes through the waveguide display, wherein the night vision device has a data input and the second output light and the first output light are confined to separate portions of a field of view presented by the night vision device.

An apparatus to optically fuse first output light containing visual data with second output light emitted from a night vision device, comprising:

• a waveguide display, the waveguide display is aligned relative to an eyepiece of the night vision device, such that when the waveguide display is in an ON state and the second output light exits the eyepiece, the second output light passes through the waveguide display;
• a display, the display having an input, the input is configured to receive a display input signal containing visual data, the display is configured to emit light responsive to the display input signal;
• and
• an optical device, the optical device is disposed between the display and the waveguide display, the optical device to couple emitted light from the display into the waveguide display, wherein, in the ON state, the waveguide display emits the first output light which optically fuses with the second output light, wherein a brightness of the second output light is monitored and a brightness of the first output light is adjusted to maintain a constant brightness ratio of the first output light to the second output light.

A method to optically fuse first output light emitted from a waveguide display with second output light emitted from a night vision device, comprising:

• generating emitted light from a display, wherein the generating is responsive to a display input signal containing visual data;
• coupling the emitted light into the waveguide display to provide the first output light emitted from the waveguide display;
• fusing the first output light with the second output light as the second output light passes through the waveguide display;
• monitoring a brightness of the second output light;
• and
• adjusting a brightness of the first output light based on the monitoring to maintain a constant brightness ratio of the first output light to the second output light.