| 摘要 |
A liquid crystal display includes a sensing device configured for sensing the presence or absence of a user and generating an indicating signal indicative of the presence or absence of the user, a controller configured to receive the indicating signal from the sensing device and produce a control signal in response to the indicating signal, and a switch being connected between a back-light power source and a back-light module, the switch being switched on or off in response to the control signal.
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