Abstract: A head-mounted display device is provided, including an at least partially see-through display, an electrical device, and a flexible printed circuit board (FPC) arranged on a surface of a see-through portion of the display. The FPC may include a plurality of electrical traces electrically coupled to the electrical device. Each electrical trace may be separated from at least one other electrical trace by one or more respective see-through gaps. The FPC may further include a transparent material arranged between the electrical traces in each see-through gap.

Abstract: A head-mounted display device is provided, including an at least partially see-through display, an electrical device, and a flexible printed circuit board (FPC) arranged on a surface of a see-through portion of the display. The FPC may include a plurality of electrical traces electrically coupled to the electrical device. Each electrical trace may be separated from at least one other electrical trace by one or more respective see-through gaps. The FPC may further include a transparent material arranged between the electrical traces in each see-through gap.

Abstract: A light source includes a side-emitting, light emitting diode (LED) that is mounted on a printed circuit board (PCB) or other substrate. The LED is used to illuminate a target such as a sensor or the like. In order to increase the amount of illumination emitted by the LED that reaches the target, a reflector is located on the PCB. The reflector receives light that is emitted by the LED and directed toward the PCB and not the target. This light, which would otherwise be lost, is reflected by the reflector and re-directed toward the target. By reducing the amount of light is lost, the amount of light reaching the target can be increased without a commensurate increase in the current supplied to the LED.