Electronic device with coordinated camera and display operation
An electronic device may have a camera and a display. The display may be configured to display virtual reality content for a user in which no real-world content from the camera is displayed or mixed reality content in which a combination of real-world content from the camera and overlaid virtual reality content is displayed. Control circuitry in the device may adjust the display and camera while transitioning between virtual reality and mixed reality modes. The control circuitry may reconfigure the camera to exhibit a desired frame rate immediately upon transitioning from virtual reality mode to mixed reality mode. Transitions between modes may be accompanied by smooth transitions between frame rates to avoid visible artifacts on the display. The camera frame rate may be synchronized to the display frame rate for at least part of the transition between the virtual reality and mixed reality modes.
1. An electronic device comprising:
a display;
a camera; and
control circuitry configured to:
control the display to exhibit a transitional display frame rate when transitioning between a first mode in which virtual reality content is displayed on the display and a second mode in which mixed reality content is displayed on the display using a display frame rate that is less than the transitional display frame rate, and
control the camera to operate at a camera frame rate synchronized with the transitional display frame rate when the display exhibits the transitional display frame rate.
2. The electronic device defined in claim 1 , wherein the control circuitry is configured to control the display to display the virtual reality content at a display frame rate different than the transitional display frame rate and different than the display frame rate used to display the mixed reality content.
3. The electronic device defined in claim 1 , wherein the control circuitry is configured to control the display to transition between the first and second modes using a frame period change rate of less than 0.1 ms per frame.
4. The electronic device defined in claim 1 , wherein the mixed reality content includes real-world content from the camera.
5. The electronic device defined in claim 4 , wherein the virtual reality content excludes real-world content from the camera.
6. The electronic device defined in claim 1 , wherein the display includes display pixels, the mixed reality content is refreshed on the display pixels at the display frame rate during the second mode, and the virtual reality content is refreshed on the display pixels at a display frame rate during the first mode different than the display frame rate during the second mode.
7. The electronic device defined in claim 6 , wherein the control circuitry is configured to control the camera to operate at a camera frame rate during the first mode that is different than the camera frame rate synchronized with the transitional display frame rate, and the display frame rate during the first mode is an integer multiple of the camera frame rate during the first mode.
8. The electronic device defined in claim 6 , wherein the control circuitry is configured to control the camera to operate at a camera frame rate during the second mode that is different than the camera frame rate synchronized with the transitional display frame rate, and the display frame rate during the second mode is an integer multiple of the camera frame rate during the second mode.
9. The electronic device defined in claim 1 , wherein the control circuitry is configured to control the camera to operate at a camera frame rate during the first mode that is different than the camera frame rate synchronized with the transitional display frame rate and to operate at a camera frame rate during the second mode that is different than the camera frame rate synchronized with the transitional display frame rate and different than the camera frame rate during the first mode.
10. The electronic device defined in claim 1 , wherein the control circuitry is configured to perform beam chasing operations using the display and the camera in the first mode and in the second mode.
11. An electronic device comprising:
a display;
a camera; and
control circuitry configured to operate the camera and the display at:
a first setting in which the camera captures a first set of image frames at a first camera frame rate, and in which the display displays augmented reality content that includes at least a portion of the captured first set of image frames and non-real-world content, and
a second setting in which the camera captures a second set of image frames at a second camera frame rate different than the first camera frame rate, and in which the display displays virtual reality content that includes non-real-world content and excludes the second set of image frames, wherein the first camera frame rate is greater than the second camera frame rate.
12. The electronic device defined in claim 11 , wherein the control circuitry is configured to detect an object based on the captured second set of image frames in the second setting.
13. The electronic device defined in claim 12 , wherein the control circuitry is configured to detect a location or a motion associated with the object based on the captured second set of image frames in the second setting.
14. The electronic device defined in claim 12 , wherein the control circuitry is configured to transition the camera and the display from the second setting to the first setting based on the detected object.
15. An electronic device comprising:
a display; and
control circuitry coupled to the display and configured to:
operate the display to display content at a frame rate in a virtual reality mode, and
operate the display to transition out of the virtual reality mode by varying the frame rate, at which the content is displayed during the transition, by a constant adjustment rate across a transition time period for the transition.
16. The electronic device defined in claim 15 , wherein varying the frame rate by the constant adjustment rate across the transition time period comprises decrementing the frame rate by a decrement rate across the transition time period.
17. The electronic device defined in claim 15 , wherein the control circuitry is configured to operate the display to display the content at a non-zero frame rate at an end of the transition time period.
18. The electronic device defined in claim 17 , wherein the control circuitry is configured to operate the display to display the content at the non-zero frame rate in a mixed reality mode.