Eye-movement tracking apparatus and electronic device

An eye-movement tracking apparatus, comprising:

• a light source;
• a polarizer;
• a hot mirror, wherein the hot mirror is located on an out-light side of the polarizer;
• and
• a compact camera module, wherein the compact camera module is disposed on a side of the polarizer that faces away from the hot mirror, the light source is configured to emit a light ray to an eyeball of a user, the light ray is reflected by the eyeball to form a first light ray and a second light ray that are emitted to the polarizer, wherein, after being propagated between the polarizer and the hot mirror, the first light ray is emitted from a first area of the polarizer, wherein, after being propagated between the polarizer and the hot mirror, the second light ray is emitted from a second area of the polarizer, and wherein a receive field of view of the compact camera module covers the first area and is staggered in the second area,
• wherein a polarization of the first light ray is different from a polarization of the second light ray, and the polarization of the first light ray and the polarization of the second light ray are determined by a number of times the first light ray and the second light ray respectively are reflected by the hot mirror.

An electronic device, wherein the electronic device comprises a display screen and an eye-movement tracking apparatus comprising:

• a light source;
• a lens group;
• a hot mirror, wherein the hot mirror is disposed on an out-light side of the lens group;
• and
• a compact camera module;
• wherein the compact camera module comprises an image sensor and an optical component located on an in-light side of the image sensor, the light source is configured to emit light ray to an eyeball of a user, the light ray is reflected by the eyeball to form a first light ray and a second light ray that are emitted to the lens group, the first light ray is reflected by the hot mirror for N times to form a third light ray, the second light ray is reflected by the hot mirror for M times to form a fourth light ray, both M and N are natural numbers, M and N are different, and the optical component allows the third light ray to enter the image sensor and prevents the fourth light ray from entering the image sensor;
• and
• wherein the display screen is disposed on a side of the hot mirror that faces away from the lens group or a polarizer, and
• wherein a polarization of the third light ray is different from a polarization of the fourth light ray, and the polarization of the third light ray and the polarization of the fourth light ray are determined by the number of times the third light ray and the fourth light ray respectively are reflected by the hot mirror.