Projection type display device and method for controlling operation of projection type display device
AssigneeNEC Display Solutions, Ltd.
InventorHiroshi Kato
Life of this patent
Estimating the term…
Abstract
A projection-type display which projects and displays images in accordance with an image signal includes a light source for projecting the images, output means that is equipped with a coil and switch, that uses electromagnetic induction of the coil to supply a current, and that changes the magnitude of the current by means of the switch, a cooling fan that cools the projection-type display device and for which the rotational speed is variable; and control means that, upon receiving an instruction to set a first mode in which a first current is intermittently supplied to the light source.
Claims11
A projection-type display device that projects and displays images in accordance with an image signal, comprising:
- a light source for projecting the images;
- an output unit that is equipped with a coil and switch, that uses electromagnetic induction of the coil to supply a current, and that changes the magnitude of the current by means of the switch;
- a cooling fan that cools a component within the projection-type display device and for which the rotational speed is variable;
- and
- a control unit including a memory unit and a regulator storing instructions to cause the control unit to:
- upon receiving an instruction to set a first mode, concurrently both controls the switch to set the output current of the output unit to a first current and intermittently supply the first current to the light source in accordance with a Pulse-Width Modulation (PWM) signal and sets the rotational speed of the cooling fan to a first rotational speed;
- and
- upon receiving an instruction to set a second mode in which the light source continuously emits light for projecting the images, concurrently both controls the switch to set the output current of the output unit to a second current that is smaller than the first current and continuously supply the second current to the light source and sets the rotational speed of the cooling fan to a second rotational speed that is lower than the first rotational speed,
- wherein, in the second mode, the regulator sets a state in which the LED lighting duty equals 100%.
An operation control method of a projection-type display device that includes a light source for projecting images according to an image signal, an output unit that is equipped with a coil and a switch, that uses electromagnetic induction of the coil to supply a current, and that changes a magnitude of the current by means of the switch, and a cooling fan for cooling a component within the projection-type display device and for which the rotational speed is variable;
- the operation control method comprising:
- upon receiving an instruction to set a first mode, concurrently both controlling the switch to set the output current of the output unit to a first current to intermittently supply the first current to the light source in accordance with a Pulse-Width Modulation (PWN) signal and setting the rotational speed of the cooling fan to a first rotational speed;
- and
- upon receiving an instruction to set a second mode in which the light source continuously emits light for projecting the images, concurrently both setting the output current of the output unit to a second current that is smaller than the first current to continuously supply the second current to the light source and setting the rotational speed of the cooling fan to a second rotational speed that is lower than the first rotational speed,
- wherein, in the second mode, a state in which the LED lighting duty equals 100% is set.
A projection-type display device that projects and displays images in accordance with an image signal, comprising:
- a light source for projecting the images;
- an output unit for supplying a current and for changing a magnitude of the current;
- a cooling fan for cooling a component within the projection-type display device and for which the rotational speed is variable;
- and
- a control unit that:
- upon receiving an instruction to set a first mode, concurrently sets the output current of the output unit to a first current and intermittently supplies the first current to the light source in accordance with a Pulse-Width Modulation (PWN) signal and sets the rotational speed of the cooling fan to a first rotational speed;
- and
- upon receiving an instruction to set a second mode in which the light source continuously emits light for projecting the images, concurrently sets the output current of the output unit to a second current that is smaller than the first current and continuously supplies the second current to the light source and sets the rotational speed of the cooling fan to a second rotational speed that is lower than the first rotational speed,
- wherein, in the second mode, the control unit sets a state in which the LED lighting duty equals 100%.
Dependencies are inferred from the claim text.