JP2010169908A - Projection display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection display device capable of cooling and controlling all the parts inside the device optimally by taking the scope of temperature of a light source during operation into account. <P>SOLUTION: The projection display device includes the light source 1, a modulating means 13 for modulating light from the light source in accordance with an image signal, a projection lens 5 for projecting modulated light, an electronic circuit 12 including a power supply circuit and a signal processing circuit, a cooling device for cooling the inside of the device, and a controlling means 11 for controlling drive of the cooling device. The cooling device includes a light source cooler 2 for cooling the light source, a modulating means cooler 4 for cooling the modulating means, and a circuit cooler 6 for cooling the electronic circuit 12, wherein the cooling device includes an operation mode including usual operation mode and a highly cooling mode for cooling with higher power than that of the usual operation mode. The controlling means 11 controls in such a way that the specific cooler cools with power equal to the usual operation mode in the highly cooling mode and the other coolers cool with higher power than that in the usual operation mode. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to cooling control of a projection display device.

  Projection-type display devices, so-called projectors, have been used by various users in recent years, and required specifications and performance are diversified. Even companies and educational institutions where the introduction of projectors has been relatively popular in the past, not only the high brightness and resolution, but also the running costs are becoming more important, and the product life is longer and the performance is higher. What is better is needed.

  Cooling control is an important factor in extending the product life, and it is generally known that electronic components, optical components, and structural components all have longer lifetimes as the temperature is kept lower. Therefore, various cooling control methods have been conventionally employed.

  For example, Patent Document 1 discloses a technique for increasing the cooling capacity after turning off the light source.

Japanese Patent No. 2903655

  The conventional technique is to increase the cooling capacity after turning off the light source, and is not the cooling control when the light source is in the ON state, that is, when the product is operating. In order to extend the life of the product, it is important to increase the cooling capacity during operation when parts are thermally loaded.

  In addition, there is also a product provided with an operation mode that increases the cooling capacity compared to that during normal use, intended for use at high altitudes. This takes the approach of increasing the capacity of the total cooler. For general electronic parts, structural parts, and optical parts, the higher the cooling capacity, the more advantageous the life of the parts. Therefore, this operation mode can be used for the purpose of extending the life.

  However, discharge lamps used as light sources have an upper and lower temperature limit that is optimal for maintaining the discharge state. Even if the temperature is too low, it may cause blackening and cloudiness, which adversely affects performance. Will be affected. When viewed as a product, a lamp in which these symptoms have occurred cannot satisfy the predetermined performance, and is effectively synonymous with having reached the end of its life. That is, when the above-described high altitude operation mode is used at a place other than the high altitude, the discharge lamp is overcooled, and as a result, the life and performance are reduced. As a result, the product life is shortened.

  Therefore, in view of the above problems, the present invention performs as optimal cooling control as possible on all components in the projection display device while considering the temperature range of the light source during operation. With the goal.

  A projection display device according to the present invention includes a light source, a modulation unit that modulates light from the light source according to a video signal, a projection lens that projects light modulated by the modulation unit, and a power source for the projection display device. An electronic circuit including a power supply circuit to be supplied and a signal processing circuit that processes a video signal and outputs it to a modulation unit; a cooling device that cools the inside of the projection display device; and a control unit that controls driving of the cooling device. The cooling device includes a light source cooler that cools the light source, a modulation means cooler that cools the modulation means, and a circuit cooler that cools the electronic circuit. The cooling device is at least a projection type as an operation mode. A normal operation mode for performing cooling suitable for normal operation of the display device, and a high cooling mode for performing cooling with a higher capacity than the normal operation mode, and the control means is configured to perform specific cooling among the cooling devices in the high cooling mode. Container Performs the operation mode equivalent to cooling, other cooler is controlled so as to cool at a higher than normal operating mode capability.

  In the projection display device of the present invention, the cooling device includes at least a normal operation mode for performing cooling suitable for the normal operation of the device and a high cooling mode for performing cooling with higher capacity than the normal operation mode. The control means controls so that a specific cooler in the cooling device performs cooling equivalent to that in the normal operation mode even in the high cooling mode. If the specific cooler is a light source cooler, optimum cooling control can be performed on all the components inside the apparatus while considering the temperature range of the light source during operation.

1 is a configuration diagram of a projection display device according to Embodiment 1. FIG. 6 is a configuration diagram of a projection display apparatus according to Embodiment 2. FIG.

(Embodiment 1)
<Configuration>
FIG. 1 is a configuration diagram of a projection display apparatus according to the first embodiment. The projection display apparatus according to Embodiment 1 includes a light source 1, a color foil 3, and a modulation means 13 including a mirror 10 made of, for example, a DMD (digital micromirror device), a projection lens 5, and an electronic circuit 12.

  The modulation means 13 modulates the light emitted from the light source 1 according to the video signal. The light source 1 is assumed to be a discharge lamp. The video signal modulated by the modulation means 13 is input to the projection lens 5 via the mirror 10 and projected as a video. The electronic circuit 12 is a power supply circuit that supplies power to the projection display device, a signal processing circuit that processes a video signal and outputs it to the modulation means 13, and the like.

  Furthermore, the projection display apparatus according to Embodiment 1 includes a light source cooler 2, a modulation means cooler 4, a circuit cooler 6, an intake device 7, and an exhaust device 8 as coolers, and the cooling power of these coolers. The control means 11 which controls is provided.

  The light source cooler 2 cools the light source 1, the modulation means cooler 4 cools the modulation means 13, and the circuit cooler 6 cools the electronic circuit 12. The intake device 7 takes in outside air into the device, and the exhaust device 8 is a means for discharging heat inside the device to the outside. For example, when all of the above-described coolers are assumed to be cooling fans, the control unit 11 controls the rotational speed of the fans.

<Operation>
These cooling fans can receive the control signal from the control means 11 and set the rotation speed to an arbitrary value. The number of revolutions is controlled by controlling the duty ratio of the control signal if the cooling fan is a PWM control fan and by controlling the supply voltage to the fan if the cooling fan is a DC fan.

  The projection display apparatus according to Embodiment 1 has two operation modes: a normal operation mode that performs cooling suitable for normal operation of the projection display apparatus, and a high cooling mode that performs cooling with higher capacity than the normal operation mode. Have.

  For example, in the normal operation mode, it is assumed that the control unit 11 controls the rotation speed of all the cooling fans to 1500 rpm, and the temperature of the discharge lamp of the light source 1 is maintained in an optimum temperature range. When switching to the high cooling mode, the control means 11 performs control to increase the rotational speed of the cooling fan to 3000 rpm. However, the light source cooler 2 that cools the light source 1 is not controlled to the high cooling mode, and the rotation speed of 1500 rpm is maintained in the normal operation mode.

  As a result, for components other than the light source 1, the thermal load is reduced in the high cooling mode to extend the life, and at the same time, the discharge lamp of the light source 1 can maintain the optimum temperature range for both performance and life.

  That is, the projection display apparatus according to Embodiment 1 projects the light source 1, the modulation unit 13 that modulates the light from the light source 1 according to the video signal, and the light modulated by the modulation unit 13. An electronic circuit 12 including a projection lens 5, a power supply circuit for supplying power to the projection display device, a signal processing circuit for outputting a video signal to the modulation means 13, a cooling device for cooling the inside of the projection display device, Control means 11 for controlling the driving of the cooling device, the cooling device being a light source cooler 2 for cooling the light source 1, a modulation means cooler 4 for cooling the modulation means 13, and a circuit for cooling the electronic circuit 12. A cooling device, and the cooling device has at least a normal operation mode that performs cooling suitable for normal operation of the projection display device as an operation mode, and a high cooling mode that performs cooling with higher capacity than the normal operation mode, Equipped with It means 11, in the high cooling mode, the particular cooler of the cooling device, performs a normal operation mode and equivalent cooling, other coolers and controlled to perform the cooling at higher than normal operating mode capability. Thereby, cooling according to the temperature characteristic of the component in an apparatus can be performed.

  Further, the specific cooler is the light source cooler 2. As a result, other parts can be cooled with high capacity without overcooling the light source 1, and a long-life product can be realized.

  The light source 1 is a discharge lamp. The discharge lamp has an appropriate temperature range, and if it deviates from this, it will cause blackening and white turbidity, but the light source cooler that cools the discharge lamp also performs cooling in the high cooling mode as in the normal operation mode. Thus, the above-described adverse effects due to overcooling can be prevented.

<Effect>
As described above, the projection display apparatus according to Embodiment 1 includes the light source 1, the modulation unit 13 that modulates the light from the light source 1 according to the video signal, and the light modulated by the modulation unit 13. Including a projection lens 5 for projecting, a power supply circuit for supplying power to the projection display device, and a signal processing circuit for outputting a video signal to the modulation means 13, and cooling for cooling the interior of the projection display device And a control means 11 for controlling the driving of the cooling device. The cooling device includes a light source cooler 2 for cooling the light source 1, a modulation means cooler 4 for cooling the modulation means 13, and an electronic circuit 12. And a circuit cooler 6 for cooling. The cooling device has at least a normal operation mode for performing cooling suitable for the normal operation of the projection display device as an operation mode, and high cooling for performing cooling with a higher capacity than the normal operation mode. Mode In the high cooling mode, the control means 11 controls so that a specific cooler in the cooling device performs cooling equivalent to that in the normal operation mode, and other coolers perform cooling with higher capacity than in the normal operation mode. To do. Thereby, cooling according to the temperature characteristic of the component in an apparatus can be performed.

  Further, the specific cooler is the light source cooler 2. As a result, other parts can be cooled with high capacity without overcooling the light source 1, and a long-life product can be realized.

  The light source 1 is a discharge lamp. The discharge lamp has an appropriate temperature range, and if it deviates from this, it will cause blackening and white turbidity, but the light source cooler that cools the discharge lamp also performs cooling in the high cooling mode as in the normal operation mode. Thus, the above-described adverse effects due to overcooling can be prevented.

(Embodiment 2)
<Configuration>
FIG. 2 is a configuration diagram of the projection display apparatus according to the second embodiment. The projection display device according to the second embodiment is obtained by adding the temperature sensor 9 to the first embodiment, and the other configuration is the same as that of the projection display device according to the first embodiment shown in FIG. Therefore, the description is omitted.

  The temperature sensor 9 is disposed in the vicinity of the intake device 7 that sends outside air into the apparatus as intake air, and measures the temperature of the outside air that is taken in by the intake device 7.

<Operation>
In the first embodiment, the rotation speed of the cooling fan is controlled to a constant value in each mode. However, in the second embodiment, the control unit 11 controls each cooling fan according to the intake air temperature measured by the temperature sensor 9. The number of rotations is variably controlled. In other words, the control is performed so that each cooling fan operates at a higher speed as the intake air temperature becomes higher.

  For example, the number of rotations of all the cooling fans in the normal operation mode is variably controlled by the control means 11 according to the intake air temperature in the range of 1500 rpm to 2500 rpm, and the temperature of the discharge lamp of the light source 1 is in the optimum temperature range. And

  When switching to the high cooling mode, the control means 11 increases the rotational speed of the fans other than the light source cooler 2 to, for example, a range of 2000 rpm to 4000 rpm to improve the cooling capacity. Only the light source cooler 2 is operated in the normal operation mode, and the rotation speed is variably controlled in the range of 1500 rpm to 2500 rpm.

  That is, in the projection display device according to Embodiment 2, the cooling device further includes an intake device 7 that sends outside air into the projection display device as intake air, and the projection display device determines the intake air temperature of the intake device 7. And a temperature sensor 9 for measuring, and the control means 11 controls the driving of the cooling device according to the intake air temperature. By variably controlling the cooling fan speed according to the intake air temperature, the cooling fan speed can be adjusted only when the cooling capacity needs to be improved. Can be realized.

<Effect>
That is, in the projection display device according to Embodiment 2, the cooling device further includes an intake device 7 that sends outside air into the projection display device as intake air, and the projection display device determines the intake air temperature of the intake device 7. And a temperature sensor 9 for measuring, and the control means 11 controls the driving of the cooling device according to the intake air temperature. As in the first embodiment, components other than the light source 1 extend the life by reducing the thermal load in the high cooling mode, and at the same time, the discharge lamp of the light source 1 can maintain the optimum temperature range for both performance and life. it can. In addition, by variably controlling the cooling fan speed according to the intake air temperature, the cooling fan speed can be adjusted only when the cooling capacity needs to be improved. , Low noise can be realized.

  DESCRIPTION OF SYMBOLS 1 Light source, 2 Light source cooler, 4 Modulation means cooler, 5 Projection lens, 6 Circuit cooler, 7 Intake device, 8 Exhaust device, 9 Temperature sensor, 11 Control means, 13 Modulation means

Claims (4)

A projection display device,
A light source;
Modulation means for modulating light from the light source according to a video signal;
A projection lens that projects the light modulated by the modulation means;
An electronic circuit including a power supply circuit that supplies power to the projection display device, and a signal processing circuit that processes the video signal and outputs the processed video signal to the modulation unit;
A cooling device for cooling the inside of the projection display device;
Control means for controlling the driving of the cooling device,
The cooling device is
A light source cooler for cooling the light source;
A modulation means cooler for cooling the modulation means;
A circuit cooler for cooling the electronic circuit;
With
The cooling device is at least as an operation mode,
A normal operation mode for performing cooling suitable for normal operation of the projection display device;
A high cooling mode for cooling at a higher capacity than the normal operation mode,
In the high cooling mode, the control unit is configured such that a specific cooler of the cooling device performs cooling equivalent to the normal operation mode, and other coolers perform cooling with a higher capacity than the normal operation mode. Projection type display device to control.   The projection display device according to claim 1, wherein the specific cooler is the light source cooler.   The projection display device according to claim 1, wherein the light source is a discharge lamp. The cooling device further includes an intake device that sends outside air as intake air into the projection display device,
A temperature sensor for measuring an intake air temperature of the intake device;
The projection display device according to claim 1, wherein the control unit controls driving of the cooling device according to the intake air temperature.

Images