US 7,441,903 B2Granted

Power on/off system of thin projector and method for controlling the same

AssigneeLG Electronics Inc.

InventorHong Ki Kim

Life of this patent

Estimating the term…

Loading patent…

Abstract

A power on/off system of a thin projector including an optical system arranged in a housing with a panel shape having lateral sides and a front side having an area larger than an area of each lateral side is disclosed. The power on/off system includes a door, fans which cool a lamp, a shutter which opens/closes a projection lens, a first sensing unit which senses malfunctions of the lamp, the fans, the door, and the shutter, a second sensing unit which senses an internal temperature of the housing, and a controller which sequentially controls, in response to power-on of the thin projector, operations of opening the door and the shutter, driving the fans, driving the lamp, and sequentially controls, in response to power-off of the thin projector, operations of turning off the lamp, driving the fans, turning off the fans, and closing the door and shutter.

Claims20

Dependent claims

a door which opens/closes an air inlet or an air outlet allowing air to pass through the interior of the housing;
at least one fan which is arranged in the interior of the housing, and is adapted to cool the lamp;
a shutter which opens/closes the projection lens externally exposed from the housing;
a first sensing unit which senses malfunctions of the lamp, the fan, the door, and the shutter;
a second sensing unit which senses an internal temperature of the housing;
and
a controller which sequentially controls, in response to power-on of the thin projector, operations of opening the door and the shutter, driving the fan, and determining whether or not there is a malfunction associated with the opening of the door and the shutter, through the sensing units, driving the lamp, and determining whether or not there is a malfunction associated with the driving of the lamp and the fan, and sequentially controls, in response to power-off of the thin projector, operations of turning off the lamp, driving the fan, turning off the fan after a predetermined time elapses, closing the door and shutter, and determining whether or not there is a malfunction associated with the closing of the door and shutter, through the sensing units.

4 more elements

In a power-on/off control method for a thin projector including an optical system arranged in a housing with a panel shape having lateral sides and a front side having an area larger than an area of each lateral side, a fan adapted to cool a lamp arranged in the housing, an air inlet, an air outlet, a door adapted to open/close the air inlet or the air outlet, and a shutter adapted to open/close a projection lens, a power-off control method comprising the steps of:

powering off the thin projector;
turning off the lamp;
driving the fan;
turning off the fan after a predetermined time elapses;
closing the door and the shutter;
determining whether or not there is a malfunction as to the closing of the door;
determining whether or not there is a malfunction as to the closing of the shutter when it is determined that there is no malfunction as to the closing of the door;
and
completing the power-off control when there is no malfunction as to the closing of the shutter.

6 more elements

Dependencies are inferred from the claim text.