发明名称 |
LED DRIVING CIRCUIT, SEMICONDUCTOR ELEMENT AND IMAGE DISPLAY DEVICE |
摘要 |
An LED driving circuit driving an LED array includes: n constant-current driving elements having a vertical structure, each of which is connected to each of LED strings in series and drives the LED string with a constant current; n constant-current control circuits controlling on voltages of the constant-current driving elements so that currents flowing to the LED strings become constant currents; a lowest-voltage detecting circuit to which terminal voltages of the constant-current driving elements on an LED string side are inputted, the lowest-voltage detecting circuit selecting a lowest voltage from among the terminal voltages and outputting a command signal based on difference between the lowest voltage and a predetermined set voltage; and a power-supply control circuit controlling a voltage applied to the LED array to a voltage lower than an initial set voltage based on the command signal.
|
申请公布号 |
US2010177127(A1) |
申请公布日期 |
2010.07.15 |
申请号 |
US20100683697 |
申请日期 |
2010.01.07 |
申请人 |
RENESAS TECHNOLOGY CORP., |
发明人 |
AKIYAMA NOBORU;HASHIMOTO TAKAYUKI;HIRAO TAKASHI;MATSUURA NOBUYOSHI |
分类号 |
G06F3/038;G09G5/10 |
主分类号 |
G06F3/038 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|