US Patent No. 10,342,085

BACK LIGHT DEVICE AND CONTROLLING METHOD THEREOF


Patent No. 10,342,085
Issue Date July 02, 2019
Title Back Light Device And Controlling Method Thereof
Inventorship Sung Yong Joo, Hwaseong-si (KR)
Jin Hyung Lee, Anyang-si (KR)
Moon Young Kim, Pohang-si (KR)
Assignee SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)

Claim of US Patent No. 10,342,085

1. A back light device comprising:a first light emitting block comprising a first plurality of light emitting modules connected in series to each other;
a power supply module configured to apply a driving voltage to the first light emitting block;
a first power switch connected to the first light emitting block and configured to control the driving voltage on or off; and
a control module configured to turn on or off the first power switch such that a constant current is supplied to the first light emitting block and to control an on/off of the first plurality of light emitting modules based on a dimming signal,
wherein the control module is configured to, in response to a ripple value of the constant current being different from a certain ripple value, change at least one of a turn-on period and a turn-off period of the first power switch to calibrate the ripple value of the constant current to the certain ripple value.