Eye tracking device and head-mounted display device

An eye tracking device, comprising:

• at least one infrared camera, at least one infrared light group and a control circuit;
• wherein the control circuit is electrically connected with the at least one infrared light group, each of the at least one infrared light group comprises at least two infrared lights which are arranged at different locations;
• each of the at least one infrared camera is configured to collect an eye image of a user when the at least two infrared lights are turned on;
• the control circuit is configured to respectively control the number of infrared lights that achieve effective operating brightness in each infrared light group when the eye tracking device performs iris recognition and eye tracking, and the effective operating brightness refers that a brightness is not less than a threshold brightness;
• wherein the at least one infrared light group comprises an infrared light group which is arranged at a first location and an infrared light group which is arranged at a second location, infrared light which is emitted when the infrared light group arranged at the first location works may not directly irradiate an eye of the user, and infrared light which is emitted when the infrared light group arranged at the second location works may directly irradiate the eye of the user;
• and the control circuit is further configured to control the infrared light group which is arranged at the first location to achieve the effective operating brightness when the eye tracking device performs the iris recognition, and control the infrared light group which is arranged at the second location to achieve the effective operating brightness when the eye tracking device performs the eye tracking;
• wherein the infrared light group at the first location comprises at least two infrared lights, and the infrared light group at the second location comprises at least three infrared lights;
• a light-emitting wavelength of each infrared light in the infrared light group at the first location is less than a light-emitting wavelength of any infrared light in the infrared light group at the second location.