发明名称 |
Backlight unit and display device having the same |
摘要 |
A backlight unit includes a DC-DC converter that converts a first voltage to a second voltage in response to a driving pulse signal and a driving controller that outputs the driving pulse signal in response to an over-current control signal to control a reference voltage and a level of the second voltage. The driving controller controls the reference voltage in response to the over-current control signal such that the reference voltage increases prior to the second voltage by a predetermined time when the second voltage needs to be increased. In addition, the driving controller controls the reference voltage in response to the over-current control signal when the second voltage needs to be decreased such that the reference voltage decreases later than the second voltage by the predetermined time. |
申请公布号 |
US9504107(B2) |
申请公布日期 |
2016.11.22 |
申请号 |
US201514614289 |
申请日期 |
2015.02.04 |
申请人 |
Samsung Display Co., Ltd. |
发明人 |
Lee Woojin;Kim Yu-chol;Kim Yeong Won |
分类号 |
H05B33/08;H05B37/04 |
主分类号 |
H05B33/08 |
代理机构 |
Innovation Counsel LLP |
代理人 |
Innovation Counsel LLP |
主权项 |
1. A backlight unit comprising:
a DC-DC converter that converts a first voltage to a second voltage in response to a driving pulse signal; and a driving controller that outputs the driving pulse signal to control a level of the second voltage and controls a reference voltage in response to an over-current control signal, wherein the driving controller comprises:
a reference voltage generator that generates a reference output voltage in response to the over-current control signal,an over-current protection circuit that controls the reference voltage in response to the reference output voltage, andan output controller that outputs a comparison pulse signal in response to the reference output voltage to decide a duty ratio of the driving pulse signal, and wherein the driving controller controls the reference voltage in response to the over-current control signal such that the reference voltage increases prior to the second voltage by a predetermined time when the second voltage is increased, and the driving controller controls the reference voltage in response to the over-current control signal when the second voltage is decreased such that the reference voltage decreases later than the second voltage by the predetermined time. |
地址 |
KR |