Projection display apparatus having a cooling fan and controlling method for projection display apparatus having a cooling fan
AssigneeKabushiki Kaisha Toshiba
InventorKazuyuki Takeda
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Abstract
According to one embodiment, a projection display apparatus comprises an optical system configured to modulate light from a light source in accordance with an input image signal and to project modulated light onto a screen, a cooling fan configured to cool the optical system, an error detector configured to detect a driving error of the cooling fan, a target rotation speed setting unit configured to set a target rotation speed of the cooling fan, and a target rotation speed controller configured to increase the target rotation speed of the cooling fan when the error detector detects a drive error of the cooling fan.
Claims12
A projection display apparatus comprising:
- an optical system configured to modulate light from a light source in accordance with an input image signal and to project modulated light onto a screen;
- a cooling fan configured to cool the optical system based on a target rotation speed, the cooling fan comprises a shaft of a motor and a grease on the shaft;
- an error detector configured to detect a driving error of the cooling fan;
- and
- a target rotation speed controller configured to increase the target rotation speed of the cooling fan to a predetermined rotation speed when the error detector detects the driving error of the cooling fan, wherein the predetermined rotation speed comprises a rotation speed which prevents the grease from being solidified.
A projection display apparatus comprising:
- an optical system configured to modulate light from a light source in accordance with an input image signal and to project modulated light onto a screen;
- a cooling fan configured to cool the optical system based on a target rotation speed;
- a temperature measuring unit configured to measure a temperature;
- a target rotation speed controller configured to increase the target rotation speed of the cooling fan to a predetermined rotation speed when the temperature measured by the temperature measuring unit is below a predetermined temperature, the predetermined rotation speed for preventing a rotation of the cooling fan from being obstructed;
- and
- an error detector configured to detect a driving error of the cooling fan,
- wherein the target rotation speed controller is configured to increase the target rotation speed of the cooling fan when the error detector detects the driving error of the cooling fan.
A controlling method for a projection display apparatus including an optical system configured to modulate light from a light source in accordance with an input image signal and to project modulated light onto a screen, and a cooling fan configured to cool the optical system, the controlling method comprising:
- cooling the optical system by the cooling fan based on a target rotation speed;
- measuring a temperature;
- increasing the target rotation speed of the cooling fan when the measured temperature is below a predetermined temperature, the predetermined rotation speed for preventing a rotation of the cooling fan from being obstructed;
- detecting a driving error of the cooling fan;
- and
- increasing the target rotation speed of the cooling fan when the driving error of the cooling fan is detected.
A controlling method for a projection display apparatus including an optical system configured to modulate light from a light source in accordance with an input image signal and to project modulated light onto a screen and a cooling fan configured to cool the optical system, the cooling fan comprising a shaft of a motor and a grease on the shaft, the controlling method comprising:
- cooling the optical system by the cooling fan based on a target rotation speed;
- detecting a driving error of the cooling fan;
- increasing the target rotation speed when the driving error of the cooling fan is detected;
- increasing the target rotation speed of a predetermined rotation speed when the driving error of the cooling fan is detected,
- wherein the predetermined rotation speed comprises a rotation speed which prevents the grease from being solidified.
Dependencies are inferred from the claim text.