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US 6,886,942 B2Granted
Projector with light source having variable brightness based on detected temperature information
AssigneeNEC Viewtechnology, Ltd.
InventorsTakayuki Okada, Atsushi Matsudaira
Life of this patent
Estimating the term…
Abstract
A projector changes stepwise electric energy supplied to a light source based on temperature information which is detected by a temperature sensor. The temperature sensor detects the temperature of components of an optical engine or an ambient air temperature. A lamp output control circuit changes stepwise the electric energy supplied to the light source based on the temperature information detected by the temperature sensor.
Claims8
A projector comprising:
- a light source for emitting light based on electric energy supplied thereto;
- an optical engine for generating an image with an electronic device energizable based on a video signal and optical means;
- a projection lens for enlarging and projecting the image generated by said light source onto a screen;
- an electric circuit for energizing said electronic device based on a video signal input thereto;
- a power supply for supplying electric energy to said electric circuit and said light source;
- a cooling fan for cooling said optical engine;
- temperature detecting means for detecting a temperature of components of said optical engine and an ambient air temperature;
- and
- light source electric energy changing means for selecting one of a plurality of non-zero electric energy levels supplied to said light source based on temperature information detected by said temperature detecting means.
6 more elements
A projector comprising:
- a light source for emitting light based on electric energy supplied thereto;
- an optical engine for generating an image with an electronic device energizable based on a video signal and optical means;
- a projection lens for enlarging and projecting the image generated by said light source onto a screen;
- an electric circuit for energizing said electronic device based on a video signal input thereto;
- a power supply for supplying electric energy to said electric circuit and said light source;
- a cooling fan for cooling said optical engine;
- temperature detecting means for detecting a temperature of components of said optical engine and an ambient air temperature;
- fan voltage changing means for controlling a voltage applied to said cooling fan based on temperature information detected by said temperature detecting means;
- and
- light source electric energy changing means for selecting one of a plurality of electric energy levels supplied to said light source if the voltage applied to said cooling fan is determined as having reached an upper limit.
7 more elements
A projector comprising:
- a light source for emitting light based on electric energy supplied thereto;
- an optical engine for generating an image with an electronic device energizable based on a video signal and optical means;
- a projection lens for enlarging and projecting the image generated by said light source onto a screen;
- an electric circuit for energizing said electronic device based on a video signal input thereto;
- a power supply for supplying electric energy to said electric circuit and said light source;
- a cooling fan for cooling said optical engine;
- temperature detecting means for detecting a temperature of components of said optical engine and an ambient air temperature;
- and
- light source electric energy changing means for gradually raising or gradually lowering the electric energy level supplied to said light source based on temperature information detected by said temperature detecting means.
6 more elements
A projector comprising:
- a light source for emitting light based on electric energy supplied thereto;
- an optical engine for generating an image with an electronic device energizable based on a video signal and optical means;
- a projection lens for enlarging and projecting the image generated by said light source onto a screen;
- an electric circuit for energizing said electronic device based on a video signal input thereto;
- a power supply for supplying electric energy to said electric circuit and said light source;
- a cooling fan for cooling said optical engine;
- temperature detecting means for detecting a temperature of components of said optical engine and an ambient air temperature;
- fan voltage changing means for controlling a voltage applied to said cooling fan based on temperature information detected by said temperature detecting means;
- and
- light source electric energy changing means for gradually lowering the electric energy level supplied to said light source supplied to said light source if the voltage applied to said cooling fan is determined as having reached an upper limit.
7 more elements
Dependencies are inferred from the claim text.