Abstract: A PWM control system includes a memory and a processor. The processor obtains characteristics of a camera capturing an image of a video display. The characteristics include a duration of a camera shutter open period. The processor calculates a PWM timing control for the display, specifying a PWM cycle duration based on the period. The processor sends a signal to the video display including the timing control and configured to control video display brightness when the camera shutter is open. The characteristics may further indicate that the camera has a global shutter. The signal may cause a plurality of PWM cycles to be output while the camera shutter is open. The signal may cause initiation of the PWM cycle based on a camera shutter synchronization signal received by the processor.

Abstract: A PWM control system includes a memory and a processor. The processor obtains characteristics of a camera capturing an image of a video display. The characteristics include a duration of a camera shutter open period. The processor calculates a PWM timing control for the display, specifying a PWM cycle duration based on the period. The processor sends a signal to the video display including the timing control and configured to control video display brightness when the camera shutter is open. The characteristics may further indicate that the camera has a global shutter. The signal may cause a plurality of PWM cycles to be output while the camera shutter is open. The signal may cause initiation of the PWM cycle based on a camera shutter synchronization signal received by the processor.

Abstract: A PWM control system includes a memory and a processor. The processor obtains characteristics of a camera capturing an image of a video display. The characteristics include a duration of a camera shutter open period. The processor calculates a PWM timing control for the display, specifying a PWM cycle duration based on the period. The processor sends a signal to the video display including the timing control and configured to control video display brightness when the camera shutter is open. The characteristics may further indicate that the camera has a rolling shutter. The cycle duration may further be based on a frame period of video data displayed by the display. The timing control may further specify the PWM cycle, configured to align a subset of the cycle to the period. The processor may adjust the timing control to reduce a visual artifact in the video output from the camera.

Abstract: A PWM control system includes a memory and a processor. The processor obtains characteristics of a camera capturing an image of a video display. The characteristics include a duration of a camera shutter open period. The processor calculates a PWM timing control for the display, specifying a PWM cycle duration based on the period. The processor sends a signal to the video display including the timing control and configured to control video display brightness when the camera shutter is open. The characteristics may further indicate that the camera has a rolling shutter. The cycle duration may further be based on a frame period of video data displayed by the display. The timing control may further specify the PWM cycle, configured to align a subset of the cycle to the period. The processor may adjust the timing control to reduce a visual artifact in the video output from the camera.

Abstract: A video display device includes LED pixels, a memory, and a processor. The processor receives video data that includes video pixels that correspond to the LED pixels. For at least some of the video pixels, the processor calculates a viewing angle for the LED pixel based on (i) a 3D location and optical axis vector for the LED pixel and (ii) a 3D location of a viewer of the LED pixel. The processor calculates a gain factor for the LED pixel based on the viewing angle and a relationship between pixel intensity and pixel viewing angle for the LED pixel. The processor calculates a compensated brightness for the LED pixel based on the gain factor and a brightness of the video pixel. The processor causes the LED pixel to emit light having the compensated brightness.

Abstract: A PWM control system includes a memory and a processor. The processor obtains camera characteristics relating to a camera that is configured to capture an image displayed by a video display. The camera characteristics include a duration of a period when a shutter of the camera is open. The processor also calculates a PWM timing control for the video display. The PWM timing control specifies a PWM cycle duration that is based on the period when the shutter of the camera is open. The processor further sends a signal to the video display. The signal includes the PWM timing control and is configured to cause the video display to control a brightness of the video display according to the PWM timing control during the period when the shutter of the camera is open.

Abstract: A PWM control system includes a memory and a processor. The processor obtains camera characteristics relating to a camera that is configured to capture an image displayed by a video display. The camera characteristics include a duration of a period when a shutter of the camera is open. The processor also calculates a PWM timing control for the video display. The PWM timing control specifies a PWM cycle duration that is based on the period when the shutter of the camera is open. The processor further sends a signal to the video display. The signal includes the PWM timing control and is configured to cause the video display to control a brightness of the video display according to the PWM timing control during the period when the shutter of the camera is open.

Abstract: A video display device includes LED pixels, a memory, and a processor. The processor receives video data that includes video pixels that correspond to the LED pixels. For at least some of the video pixels, the processor calculates a viewing angle for the LED pixel based on (i) a 3D location and optical axis vector for the LED pixel and (ii) a 3D location of a viewer of the LED pixel. The processor calculates a gain factor for the LED pixel based on the viewing angle and a relationship between pixel intensity and pixel viewing angle for the LED pixel. The processor calculates a compensated brightness for the LED pixel based on the gain factor and a brightness of the video pixel. The processor causes the LED pixel to emit light having the compensated brightness.