Stand-by power control device, liquid crystal display device including the same, and method of controlling stand-by power

摘要

A stand-by power control device includes a power block unit that receives a driving power voltage and a non-driving power voltage from a power supply unit and that selectively provides the driving power voltage or the non-driving power voltage as a supply voltage, a stand-by power generation unit that receives the supply voltage and that outputs a stand-by voltage generated by reducing the supply voltage, a power selection unit that receives the supply voltage and the stand-by voltage and that selectively outputs the supply voltage or the stand-by voltage as an operating voltage, and a state detection unit that receives a state detection voltage from the power supply unit and that controls the power block unit, the stand-by power generation unit, and the power selection unit based on the state detection voltage.

主权项

1. A power control subsystem for use in a power consuming device, the subsystem comprising:
a liquid crystal display (LCD) device; a power block unit configured to receive a driving power voltage and a non-driving power voltage from a power supply unit, and to selectively provide the driving power voltage or the non-driving power voltage as a supply voltage; a stand-by power generation unit configured to receive the supply voltage, and to output a stand-by voltage that is generated by reducing the supply voltage; a power selection unit configured to receive the supply voltage and the stand-by voltage, and to selectively output the supply voltage or the stand-by voltage as an operating voltage; and a state detection unit configured to receive a state detection voltage from the power supply unit, and to control the power block unit, the stand-by power generation unit, and the power selection unit based on the state detection voltage, wherein the state detection unit is configured to control the liquid crystal display (LCD) device so as to operate in an idle mode when the state detection voltage is within a predetermined first voltage range, the state detection unit is configured to control the LCD device so as to operate in a normal mode when the state detection voltage is within a non-overlapping and predetermined second voltage range that is higher than the first voltage range, and the state detection unit is configured to control the LCD device so as to operate in a stand-by mode when the state detection voltage is within a non-overlapping and predetermined third voltage range that is higher than the second voltage range.