KR100821736B1 - Method and apparatus for controlling of a project type image display device - Google Patents

Abstract

The present invention is to apply the lamp brightness differentially depending on whether the image signal is input in the projection image display device, and to use the lamp more efficiently by applying different cooling conditions according to the lamp brightness.

That is, the present invention maintains the brightness of the lamp at a constant constant when there is an image signal, and drives the cooling fan according to an ambient temperature for cooling the lamp, and when the image signal does not exist, the lamp is It is to be driven at a low power so that the rotational speed of the cooling fan can also be reduced while maintaining the brightness of the lamp to a minimum.

Therefore, according to the present invention, the brightness of the lamp can be differentially applied depending on whether or not an image signal is input, thereby not only extending the lamp life, but also optimally cooling by applying the rotational speed of the cooling fan differentially according to the lamp conditions. Conditions can be applied, and by selectively driving the lamp at the maximum or minimum brightness depending on the situation, there is an effect that can prevent unnecessary power consumption in advance.

Lamp / cooling

Description

Method and apparatus for controlling of a project type image display device}

1 is a flowchart illustrating a control method of a projection image display device according to the related art.

2 is a graph showing lamp brightness over time of a projection image display device according to the related art.

Figure 3 is a block diagram showing a control device of a projection image display device according to the present invention.

4 is a flowchart illustrating a control method of a projection image display device according to the present invention;

5 is a diagram illustrating lamp brightness depending on whether an image signal is present.

<Description of the symbols for the main parts of the drawings>

100: first temperature sensing unit 200: second temperature sensing unit

300: control unit 400: memory

500: lamp driving unit 510: lamp

600: fan drive unit 610: cooling fan

700: key input unit

The present invention relates to an image display device. In particular, in a projection image display device, the lamp brightness is differentially applied according to whether an image signal is input, and cooling conditions are differently applied according to the lamp brightness so that the lamp can be utilized more efficiently. A control apparatus and method for a projection image display apparatus are provided.

In general, a projector is a kind of advanced light exchanger that displays the image enlarged through a lens by receiving signals from various video devices such as a TV, a VCR, a DVD player, a PC, a camcorder, and the like.

Unlike three-tube projectors, called beam projectors, current LCD and DLP projectors automatically display optimal screens simply by connecting various video devices without the need for settings. It is rapidly spreading for theaters.

To be called a data projector, it must have a panel resolution of at least XGA (1024 x 768) or higher, and its brightness must be such that the screen is not dark in a medium-sized or larger conference room.

In particular, data projectors will mainly be used for presentations using a PC, so compatibility with PC input is very important, and additional functions such as enlarging a portion of the screen will be more convenient.

These projector types include PRT (CRT) projectors, LCD projectors, and DLP projectors.

PRT (CRT) projectors produce a desired picture in a small, fairly bright CRT, and then use the lens to form an image on the screen. One-tube, one PRT (CRT), R (red), G (green), B (Blue) There are three pipes with three PRTs (CRTs).

In the case of single tube type, the particles of R, G, and B are separated, so if the screen is large, the particles are separated, so it is not good to see the magnifier with magnifier. It is easy to adjust, and usually has low brightness and low resolution.

In the case of the three tube type, there are three PRT (CRT) tubes each for R, G, and B light, and they are projected to match the focus on one screen. Can be obtained, and brightness and resolution can also be better.

However, since the three PRTs (CRTs) do not coincide in the same optical axis, there is a difficulty in adjusting the convergence to configure the screen surface on the line where the three optical axes coincide and to focus there.

Nowadays, the usage is gradually decreasing due to the lack of brightness, difficulty in adjusting the deflection according to the frequency of the PC input, and difficulty in adjusting the convergence caused by structural disadvantages in the case of the three-pipe type.

In addition, the most widely used LCD projector is the projector which shows the fastest development. The projector is designed to pass light generated from a powerful lamp through a transmissive LCD panel and then use an lens to form an image on the front screen. to be.

As the device used in the LCD Projector is an LCD panel, the resolution of the projector is determined according to the resolution of the LCD panel, and it has a strong side with respect to PC input because there is no deflection change due to the change of the input frequency.

LCD projectors also have low-priced single- and high-priced three-panel displays. Recently, the three-panel type is preferred except for ultra-low-priced ones. do.

In particular, in the case of a three-panel LCD projector, the optical axis is matched through the prism of the light passing through each of the R, G, and B panels, making the light appear to come from one light source, and then passing through the lens. There is no difficulty in focus and convergence adjustment, so it is easy to install and the size of the device is quite small compared to the PRT (CRT) type projector, and it can be made relatively bright compared to the PRT (CRT) type.

However, it is still technically difficult to realize natural color reproduction or high contrast ratio as in the conventional PRT (CRT) method, and Gamma characteristics are still inferior to PRT (CRT), so AV enthusiasts still prefer the PRT method. In some cases.

However, due to its price / performance ratio, superior PC input compatibility, small size, and bright screen, many businesses and individual users prefer LCD projectors.

Such a general projector may be composed of an engine unit (lamp unit), a power unit, a signal processing unit, and the like, and the engine unit may perform such a role by optically enlarging and displaying an input signal. It is an important factor, and lamp brightness is the most important factor that determines screen brightness.

Hereinafter, a lamp control method of a projection image display device according to the related art will be described with reference to the accompanying drawings.

1 is a flow chart illustrating a lamp control method of a projection image display device according to the prior art, and FIG. 2 is a graph showing lamp brightness over time of the projection image display device according to the prior art.

Referring to FIG. 1, a lamp control method of a projection image display device according to the related art first controls the driving of a cooling fan at a predetermined constant speed when the lamp is turned on (S11 to S12).

In operation S13, it is determined whether a video signal exists.

As a result of the determination (S13), if a signal is present, the corresponding video signal is output, and the lamp also maintains a constant brightness (S14 to S15).

When the user inputs the power off command, the process ends (S16).

That is, as shown in FIG. 2, the projection type image display device according to the related art always shows a constant brightness regardless of an input of an image signal.

Accordingly, the projection image display device according to the prior art has a problem in that the lamp life is always reduced and the unnecessary power consumption is increased by driving the lamp at a constant brightness without distinguishing between the presence and the absence of an image signal.

The present invention has been made to solve the above problems, and an object thereof is to enable a lamp to be differentially driven according to the presence or absence of an image signal.

In addition, there are other objectives to extend the lamp life.

Projection type image display apparatus according to the present invention for achieving the above object is a key input unit for inputting a user request command, and a first temperature for sensing the ambient temperature of the lamp in the projection image display device having a lamp and a cooling fan A detector, a second temperature detector for sensing a temperature of a space in which the projection image display device is installed, a signal determiner for determining whether an image signal is input, and the lamp according to a determination result of the signal determiner It is configured to include a control unit for controlling so that it can be driven differentially, and thereby selectively control the driving of the cooling fan.

Preferably, the lamp driver further includes a lamp driver driving the lamp in a normal mode or low power according to a control signal of the controller, and a fan driver selectively controlling the rotational speed of the cooling fan according to the control signal of the controller. There is a characteristic.

More preferably, the control unit outputs a control signal so that the lamp can be driven in a low power mode if the image signal input is not detected.

More preferably, the control unit outputs a control signal to reduce the rotational speed of the cooling fan if the image signal input is not detected.

More preferably, the first temperature sensing unit is mounted around the lamp, and the second temperature sensing unit is mounted outside the projection image display apparatus.

A control method of a projection image display device according to the present invention for achieving the above object is a control method of a projection image display device having a first temperature sensor, a second temperature sensor, a lamp and a cooling fan, the user is powered Driving the lamp and the cooling fan when an on command is input; sensing the lamp ambient temperature and the room temperature through the first and second temperature sensing units when the lamp and the cooling fan are driven; And determining the presence of the input signal and selectively controlling the lamp and the cooling fan according to the presence of the video signal.

Preferably, the step of selectively controlling the lamp and the cooling fan includes controlling the lamp to be driven at low power when the image signal does not exist, and when the lamp is driven at low power, the cooling fan at a low speed below a preset speed. It is characterized by including the step of rotating to.

More preferably, controlling the lamp to be driven at low power is characterized by reducing the brightness of the lamp.

More preferably, the method further includes determining whether the lamp is driven for a predetermined time or more at low power and shutting down the power when the lamp is driven at a low power for more than a predetermined time. It has its features.

More preferably, the step of selectively controlling the lamp and the cooling fan further comprises driving the lamp at the maximum brightness when the image signal exists, and driving the cooling fan according to a preset condition. There is this.

Hereinafter, a control apparatus and a method of a projection image display device according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram illustrating a control device of a projection image display device according to the present invention, FIG. 4 is a flowchart illustrating a control method of a projection image display device according to the present invention, and FIG. 5 is a lamp brightness according to an image signal input. The figure which shows.

As shown in FIG. 3, the control device of the projection image display device according to the present invention includes a lamp 510, a cooling fan 610, a key input unit 700 for inputting a user request command, and the lamp ( It is determined whether the first temperature sensing unit 100 for sensing the ambient temperature of the 510, the second temperature sensing unit 200 for sensing the temperature of the space in which the projection image display device is installed, and whether an image signal is input. Control the lamp 510 to be differentially driven, thereby selectively controlling the driving of the cooling fan 610 and the lamp according to a control signal of the controller 300. Lamp driving unit 500 for driving the 510, the fan driver 600 for driving the cooling fan 610 according to the control signal of the control unit 300, the memory 400 for storing menus and information It is configured to include.

Here, the first temperature sensor 100 is mounted around the lamp 510 to detect the ambient temperature of the lamp 510, and the second temperature sensor 200 is provided with the projection image display device. In order to measure the room temperature of the space, it is mounted on the outside of the projection image display device, that is, in an area such as a power supply terminal (not shown).

The operation of the control device of the projection type image display device according to the present invention configured as described above is as follows.

When the user inputs a power-on command through the key input unit 700, the controller 300 outputs a control signal to the lamp driver 500 to drive the lamp 510 and detects the first temperature. The ambient temperature of the lamp 510 is detected at a predetermined period through the unit 100, and the room temperature of the space in which the projection image display device is installed is detected at a predetermined period through the second temperature detector 200.

In addition, the controller 300 periodically checks whether an image signal is input. This is because when the user does not input any image with only the projection image display device turned on, only the preset image (blue) is displayed on the projected screen side, and the lamp 510 is continuously detected at the maximum brightness. to be.

Therefore, the controller 300 controls to selectively output the brightness of the lamp 510 according to whether or not an image signal exists, and when the image signal does not exist, the lamp 510 may be driven at low power. Switch to dimming mode.

In addition, if the lamp 510 is driven at low power, the brightness of the lamp 510 will also be reduced. If the brightness of the lamp 510 is reduced, the temperature detected by the first temperature sensing unit 100 will also decrease. Therefore, the control unit 300 accordingly outputs a control signal to the fan driver 600 so that the rotational speed of the cooling fan 610 can also be reduced.

Meanwhile, when an image signal is detected, the controller 300 controls signals to the lamp driver 500 and the fan driver 600 to drive the lamp 510 and the cooling fan 610 to preset default values. Outputs

The control method of the projection type image display device according to the present invention configured as described above will be described with reference to FIG. 4. First, when the lamp is driven, the cooling fan is also driven according to preset conditions (S101 to S102).

Then, the ambient temperature (light source temperature) and room temperature of the lamp are sensed through the first and second temperature detectors 100 and 200 (S103 to S104).

Next, it is determined whether a video signal exists (S105).

As a result of the determination (S105), if there is no image signal, the lamp 510 is switched to the dimming mode to be driven in the low power mode, and the brightness of the lamp 510 is minimized (S106).

When the lamp 510 is driven at low power, the temperature of the lamp 510 is also reduced, thereby reducing the rotation speed of the cooling fan 610 (S107).

Subsequently, it is determined whether a predetermined time has elapsed in this state (S108).

As a result of the determination (S108), if the predetermined time has not elapsed, the steps S102 to S107 are repeated, and if the lamp 510 maintains a low power state even after the predetermined time elapses, the power is automatically shut down ( Shut Down) (S109).

On the other hand, the determination result (S105), if the video signal is present to drive the lamp 510 and the cooling fan 610 to a predetermined default value (S110). At this time, the lamp 510 maintains the maximum brightness.

If the user inputs the power-off command, all routines are terminated, otherwise, the process enters the step S102 (S111).

As described above, the user determines whether an image signal is present in driving the lamp 510 and the cooling fan 610 after the user turns on the projection image display device, and accordingly, the lamp 510 according to the result. In addition to determining whether to operate in a normal or low power mode, it is possible to apply the rotational speed of the cooling fan 610 differentially.

Therefore, as shown in (a) of FIG. 5, when the image signal is present, the brightness of the lamp 510 is kept at a constant maximum, and the cooling fan 610 according to the ambient temperature for cooling the lamp 510. 5), and when there is no image signal as shown in (b) of FIG. 5, the lamp 510 is driven at a low power so that the brightness of the lamp 510 is kept to a minimum. The rotation speed of 610 is also to be reduced.

As described above, the control device and method of the projection image display device according to the present invention have the following effects.

First, the brightness of the lamp may be differentially applied depending on whether an image signal is input.

Second, the lamp life can be differentially applied depending on the situation, thereby extending the lamp life.

Third, the optimum cooling conditions can be applied by differentially applying the rotational speed of the cooling fan according to the lamp conditions.

Fourth, it is possible to prevent unnecessary power consumption by selectively driving the lamp to the maximum or minimum brightness depending on the situation.

Claims (10)

In a projection image display device having a lamp and a cooling fan, A key input unit for inputting a user request command; A first temperature sensor configured to sense an ambient temperature of the lamp; A second temperature sensor mounted outside the projection image display device to sense a temperature of a space in which the projection image display device is installed; A fan driving unit controlling a rotation speed of the cooling fan according to the temperature sensed by the first temperature sensing unit; And, A control unit for controlling the lamp to be differentially driven by determining whether an image signal is input, and accordingly selectively controlling a driving of the cooling fan. . The method of claim 1, And a lamp driver for driving the lamp in a normal mode or low power according to a control signal of the controller. The method of claim 1, The control unit enables the lamp to be driven in a low power mode if an image signal input is not detected, and outputs a control signal to shut down the power when the power is maintained even after a preset time elapses. Control of the instrument. The method of claim 1, And the control unit outputs a control signal to reduce the rotational speed of the cooling fan if the image signal input is not detected. delete In the control method of a projection type image display device having a first temperature sensor, a second temperature sensor, a lamp and a cooling fan, Driving the lamp and the cooling fan when a user inputs a power on command; Sensing ambient temperature and ambient temperature of the lamp through the first and second temperature sensing units when the lamp and the cooling fan are driven; Determining whether an input of a video signal exists; Selectively controlling the lamp and the cooling fan according to the presence or absence of the video signal; And controlling the power according to a lamp state for a preset time. The method of claim 6, Selectively controlling the lamp and the cooling fan And controlling the lamp to be driven at a low power when the image signal does not exist, and rotating the cooling fan at a low speed below a preset speed when the lamp is driven at a low power. Control method of display device. The method of claim 6, And controlling the lamp to be driven with low power reduces the brightness of the lamp. The method of claim 6, Determining whether the lamp has been driven at low power for a predetermined time or more, and if the lamp has been driven at low power for a predetermined time or more, shutting down a power supply. Control method of projection image display device. The method of claim 6, Selectively controlling the lamp and the cooling fan And driving the lamp to the maximum brightness when the image signal is present, and driving the cooling fan according to a preset condition.

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