US 12,224,719 B2
Signal processing device and image display apparatus including the same
Youngjae Jung, Seoul (KR); Sungwoong Kim, Seoul (KR); and Wooseong Kang, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Appl. No. 17/802,854
Filed by LG ELECTRONICS INC., Seoul (KR)
PCT Filed Feb. 28, 2020, PCT No. PCT/KR2020/002876
§ 371(c)(1), (2) Date Aug. 26, 2022,
PCT Pub. No. WO2021/172630, PCT Pub. Date Sep. 2, 2021.
Prior Publication US 2023/0283246 A1, Sep. 7, 2023
Int. Cl. H03F 3/183 (2006.01)
CPC H03F 3/183 (2013.01) [H03F 2200/03 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A signal processing device for outputting an audio output signal by signal processing, the signal processing device comprising:
an amplifier configured to perform amplification based on an input differential signal;
an output driver configured to output an audio output signal based on an output signal from the amplifier;
a reference voltage output device configured to output a reference voltage in response to power ON;
a pre-output driver configured to pre-compensate for an offset voltage and output a compensation signal, based on an output signal from the amplifier after the power ON; and
a first switching device disposed between an output terminal of the output driver and an output terminal of the pre-output driver,
wherein the output driver operates after the first switching device is turned on in response to the power ON, and
wherein after a level of the reference voltage output from the reference voltage output device increases in response to the power ON, a first gate driving signal input to a gate terminal of the first switching device includes a first level increase period for the first switching device in which a level of the first gate driving signal increases to a first level of the first gate driving signal, a first level maintaining period for the first switching device in which the first level of the first gate driving signal is maintained, and a second level maintaining period for the first switching device in which a second level of the first gate driving signal greater than the first level of the first gate driving signal is maintained.