US 7,321,199 B2
Display apparatus and control method thereof
Sang-Hoon Lee, Ulsan (Korea, Republic of); Jeong-Il Kang, Yongin-si (Korea, Republic of); Yung-Jun Park, Yongin-si (Korea, Republic of); and Kyoung-Geun Lee, Suwon-si (Korea, Republic of)
Assigned to Samsung Electronic Co., Ltd., Suwon-Si (Korea, Republic of)
Filed on Jul. 11, 2006, as Appl. No. 11/483,628.
Claims priority of application No. 10-2005-0084611 (KR), filed on Sep. 12, 2005.
Prior Publication US 2007/0057638 A1, Mar. 15, 2007
Int. Cl. G05F 1/00 (2006.01)
U.S. Cl. 315—194  [315/224; 315/291; 345/82; 345/204] 10 Claims
OG exemplary drawing
 
1. A display apparatus comprising:
a light source;
a plurality of driving power units, which have pulse width modulation (PWM) generators generating a PWM signal, for providing driving electric powers to the light source; and
a controller for controlling the plurality of the driving power units whereby electric currents of the driving electric powers provided from the respective driving power units comprise a phase difference;
wherein the phase difference is expressed as 1/f*N, where f corresponds to a frequency of the PWM signal and N corresponds to the number of the driving power units.