US 11,722,777 B2
System and method for PWM control of a video display screen
Christopher Deighton, Chislehurst (GB)
Assigned to Brompton Technology Ltd., London (GB)
Filed by Brompton Technology Ltd., London (GB)
Filed on Aug. 8, 2022, as Appl. No. 17/883,316.
Application 17/883,316 is a continuation of application No. 17/486,412, filed on Sep. 27, 2021, granted, now 11,445,123.
Claims priority of provisional application 63/084,354, filed on Sep. 28, 2020.
Prior Publication US 2022/0375387 A1, Nov. 24, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 23/73 (2023.01); G09G 3/32 (2016.01); G09G 5/10 (2006.01); G09G 3/20 (2006.01); G09G 5/12 (2006.01)
CPC H04N 23/73 (2023.01) [G09G 3/2014 (2013.01); G09G 3/32 (2013.01); G09G 5/10 (2013.01); G09G 5/12 (2013.01); G09G 2320/064 (2013.01); G09G 2320/0626 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A pulse width modulation (PWM) control system comprising:
a memory configured to store instructions; and
a processor coupled to the memory and configured to execute instructions stored in the memory to:
obtain camera characteristics relating to a camera that is configured to capture an image displayed by a video display, the camera characteristics comprising a duration of a period when a shutter of the camera is open;
calculate a PWM timing control for the video display, the PWM timing control specifying a PWM cycle duration based on the period when the shutter of the camera is open, wherein the PWM cycle duration is a period of time during which the PWM cycle completes; and
send a signal to the video display, the signal including the PWM timing control and scan multiplexing control information, wherein:
the scan multiplexing control information is configured to cause a scan-multiplexed LED driver to activate each LED scan line an equal number of times during the period when the shutter of the camera is open, and
the signal 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.