| 摘要 |
A liquid crystal display television capable of automatically turning off a backlight source is provided, which turns off the backlight source in case of no video signal. The method includes the steps of: (A) selecting a signal source as a working signal source for the liquid crystal display television; (B) determining whether the working signal source contains a video signal; (C) determining whether an instruction is received when no video signal is determined in step (B); (D) further determining whether a period of no video signal exceeds a predetermined time when no instruction received is determined in step (C); and (E) turning off the backlight source on a panel of the liquid crystal display television when the period of no video signal exceeding the predetermined time is determined in step (D).
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