公开(公告)号：US09443478B2

公开(公告)日：2016-09-13

申请号：US14567952

申请日：2014-12-11

Applicant: Samsung Display Co., LTD.

Inventor： Byung-Kyou Min ,  Won-Hyoung Kang ,  Song-Yi Han

IPC: H05B37/02 ,  G09G3/34

CPC classification number: G09G3/3413 ,  G09G3/3406 ,  G09G2310/0235 ,  G09G2320/0233 ,  G09G2320/064 ,  G09G2330/025

Abstract: A light source device capable of preventing luminance from being decreased, a driving method of the light source device and a display device having the light source device are disclosed. Alight source device includes a plurality of light-emitting diode (“LED”) strings and an LED driving circuit. The LED strings include LEDs emitting lights connected in serial. The LED driving circuit supplies a driving voltage to the LED strings. The LED driving circuit maximizes the driving voltage supplied to the LED strings by using the minimum string current of string currents supplied to each LED string in an initial driving period. The LED driving circuit supplies the maximum driving voltage to the LED strings by blocking a current flowing through a sensing resistor disposed to sense the minimum string current in a normal driving period.

Abstract translation: 公开了能够防止亮度降低的光源装置，光源装置的驱动方法以及具有该光源装置的显示装置。 光源装置包括多个发光二极管（LED）串和LED驱动电路。 LED串包括发射串联连接的灯的LED。 LED驱动电路向LED串提供驱动电压。 LED驱动电路通过使用在初始驱动周期中提供给每个LED串的串电流的最小串电流来最大化提供给LED串的驱动电压。 LED驱动电路通过阻止流过感应电阻器的电流来向LED串提供最大驱动电压，该感测电阻器设置为在正常驱动时段内感测最小串电流。