Eye-tracking assembly

1 . A head-mountable electronic device, comprising:

an optical module frame;

a display coupled to the optical module frame and extending in a display plane; and

an eye-tracking assembly, comprising:

a flexible printed circuit (FPC) coupled to the optical module frame and disposed about a perimeter of the display, the FPC defining a major plane oriented generally orthogonal to the display plane; and

a light emitting diode (LED) electrically coupled to the FPC along the major plane and extending orthogonal to the major plane, the LED configured to direct light away from the display.

2 . The head-mountable electronic device of claim 1 , wherein the FPC comprises a flat electronic cable having a height and a width at least five times greater than the height.

3 . The head-mountable electronic device of claim 2 , wherein the width extends in the major plane.

4 . The head-mountable electronic device of claim 1 , wherein the LED comprises a side-firing LED.

5 . The head-mountable electronic device of claim 1 , wherein the LED comprises a black housing.

6 . The head-mountable electronic device of claim 5 , wherein the LED is coupled to the FPC via a black solder.

7 . The head-mountable electronic device of claim 1 , wherein:

the head-mountable electronic device further comprises a bezel secured to the optical module frame; and

the FPC is secured to the bezel.

8 . The head-mountable electronic device of claim 7 , wherein:

the bezel and the optical module frame define a cavity between the display and a lens secured to the optical module frame; and

the FPC is disposed within the cavity.

9 . The head-mountable electronic device of claim 7 , wherein:

the bezel and the optical module frame define a cavity between the display and a lens secured to the optical module frame; and

the bezel is disposed between the FPC and the cavity.

10 . The head-mountable electronic device of claim 9 , wherein:

the bezel includes an infrared (IR) window; and

the LED is positioned to direct the light through the IR window.

11 . An optical module for a wearable electronic device, comprising:

an optical module frame;

a display coupled to the optical module frame and extending in a display plane;

a bezel coupled to the optical module frame;

a seal disposed between the bezel and the optical module frame, wherein the seal is over molded with the bezel; and

an eye-tracking assembly, comprising:

an FPC coupled to the bezel and positioned radially outward from a perimeter of the display, the FPC defining a major plane oriented non-parallel to the display plane; and

a light emitting diode (LED) electrically coupled to the FPC.

12 . The optical module of claim 11 , wherein the FPC extends through the seal.

13 . The optical module of claim 11 , wherein the seal comprises silicone.

14 . The optical module of claim 11 , wherein the major plane is oriented generally orthogonal to the display plane.

15 . An eye-tracking assembly for a head-mountable display device, comprising:

an FPC defining a major plane and coupled to a display assembly of the head-mountable display device, the display assembly including a display coupled to a frame; and

a light emitting diode (LED) array, each LED of the LED array being electrically coupled to the FPC, extending radially outward from the display orthogonal to the major plane, and oriented to project light parallel to the major plane.

16 . The eye-tracking assembly of claim 15 , wherein each LED of the LED array is coupled to the FPC via black solder.

17 . The eye-tracking assembly of claim 15 , wherein an LED of the LED array includes a height extending orthogonal to the FPC and a width greater than the height, the width extending parallel to the major plane.

18 . The eye-tracking assembly of claim 15 , further comprising a camera secured to the frame and oriented away from the display.

19 . The eye-tracking assembly of claim 18 , wherein the camera is electrically coupled to the FPC.