The invention discloses a circuit for eliminating LCD backlight black frame
insertion noises. The circuit comprises a first
phase modulation module, and / or a second
phase modulation module, wherein the first
phase modulation module is disposed between a first backlight control module and a first backlight IC, and the second phase modulation module is arranged between a second backlight control module and a second backlight IC; the first phase modulation module modulates
PWM signals outputted by the first backlight control module to the first backlight IC; the second phase modulation module modulates
PWM signals outputted by the second backlight control module to the second backlight IC; and therefore, the phases of the
PWM signals received by the first backlight IC and the second backlightIC are different, namely, the PWM signals received by the first backlight IC and the second backlight IC have
phase difference. According to the prior art, sound generated by two output capacitors has the same phase and contains large noises, while, with the circuit provided by the technical schemes of the invention adopted, the sound generated by the two output capacitors can be partially offset, and therefore, noises are reduced, and user experience can be improved. The invention also discloses a head-mounted device. The noises of the head-mounted device can be decreased, and an audiovisualeffect can be improved.