Method and apparatus for modulating backlight source, lamp strip, backlight module, and display apparatus

The embodiments of the invention provide a method and apparatus for modulating a backlight source, a lamp strip, a backlight module, and a display apparatus, and relate to the technical field of display, for reducing noise output by a backlight source. The method of modulating backlight comprises inputting periodic AC voltages into the backlight source within image-frame time so as to enable the backlight source to be periodically turned on and turned off. The method is applied to a display apparatus with a fingerprint or palm print identification function.