JP2003330115A - Control over projector corresponding to no-input-signal state - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To speedily put a projector back into a normal display state without restarting the projector when the device enters an input presence state wherein an image signal is inputted again after the operation state of the projector changes from a normal display state to a no-input-signal state wherein the image signal is not inputted and then enters a power-saving operation state. <P>SOLUTION: An operation state control part changes the operation state of a projection display part to the no-input display state when the state of a synchronizing signal changes from the input-presence state to the no-input state. When the projector enters the no-input display state and the no-input state of the synchronizing signal lasts for a 1st period, the illumination light of an illumination device is made darker than the illumination light in the no-input display state to change the projection display part to the power-saving display state wherein the electric power is made smaller than that in the no- input display state. In the no-input display state or power-saving display state, the operation state of the projection display part is returned to the normal display state when the state of the synchronizing signal changes to the input- presence state. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control for a projector that projects an image when an image signal input from the outside is in a non-input state.

[0002]

2. Description of the Related Art A projector for projecting an image is a projection display device for enlarging and displaying an image generated by using a computer on a screen. The projector is a computer generated image, VTR (Video Tape Rec
It is possible to project various images such as images (images) reproduced by an order) or a DVD (Digital Versatile Disc) player.

[0003]

A VTR used when projecting an image reproduced by a VTR.
Depending on the type, the video signal (image signal) may not be output when the portion not recorded on the video tape is reproduced. Further, the video signal is not output when the reproduction is stopped and the video tape is rewound or fast-forwarded, or when the video tape is replaced. Also,
Even in the DVD player, no video signal is output when the DVD is replaced.

As described above, the output of the image signal supplied from the image supply source to the projector may be temporarily interrupted and the image signal may not be input.

In a conventional projector, when an image signal is not input, a predetermined image such as a warning message image indicating no signal input or a solid image of blue color is displayed for a certain period of time, and a part of the image is displayed. The power saving of the device is achieved by shutting off the power output of the power supplies (hereinafter, referred to as "main power supply") other than the power supply (so-called standby power supply).

Therefore, in the conventional projector, even if the output of the image signal is once interrupted as described above, the main power source of the projector is always turned off. Therefore, after the output of the image signal is temporarily stopped,
Even if the output of the image signal was restarted, the image could not be projected and displayed unless the projector was restarted.

However, when projecting an image reproduced by an image supply source such as a VTR or a DVD player, the above-mentioned interruption of the image signal may occur relatively frequently. Therefore, it is inconvenient for the user to restart the projector every time such input of the image signal is interrupted.

The present invention has been made in order to solve the above-mentioned problems in the prior art. The operation state of the projector is changed from the normal display state to the non-input state in which no image signal is input to the power saving operation state. It is an object of the present invention to provide a technique capable of promptly returning to the normal display state without restarting the device when the input state where the image signal is input again is entered in the case of transition.

[0009]

In order to solve at least a part of the above-mentioned problems, a projector of the present invention is a projector for projecting an image,
A projection display unit that projects an image corresponding to an input image signal, a synchronization signal detection unit that detects the state of a synchronization signal that represents the timing of the image signal, and the projection display unit that corresponds to the state of the synchronization signal. An operation state control unit that controls the operation state of the projection display unit when the state of the synchronization signal is an input state in which the synchronization signal is input. When the state is a normal display state for displaying an image in accordance with the input image signal, the state of the synchronization signal, from the input state, is a non-input state in which the synchronization signal is not input, The operation state of the projection display unit is set to a no-input display state in which an image corresponding to the no-input state prepared in advance in the projection display unit is displayed, and the operation state of the projection display unit is the normal display state. The become a no-input display state from,
When the non-input state is continued for the first period, the illumination light of the illumination device used for projecting an image by the projection display unit is dimmed compared to the illumination light in the non-input display state. The operating status of the projection display
In the power-saving display state in which power is saved more than in the no-input display state, and in the no-input display state or the power-saving display state, when the state of the synchronization signal is the input state, the projection display unit The operating state of is returned to the normal display state.

In the projector of the present invention, when the state of the sync signal detected by the sync signal detecting portion is in the non-input state, that is, when the image signal is in the non-input state,
When the operation state of the projection display unit is changed from the normal display state to the no input display state and the no input state is continued for the first period,
By dimming the illumination light, the operating state of the projection display section can be set to the power saving display state, and when the sync signal state is the input state with no input display state or power saving display state, It is possible to return the operation state of the projection display unit to the normal display state. Here, "return" means returning to the original normal display state without restarting the device. That is, in the projector described above, it is possible to quickly return from the no-input display state or the power-saving display state to the normal display state without restarting the projector.

In the above projector, the operation state control section may be arranged so that when the operation state of the projection display section is changed from the no-input display state to the power-saving display state and the no-input state is continued for the second period. The operation state of the projection display unit may be set to a display power cutoff state in which a part of the power supply to the projection display unit is cut off.

In this way, when the display power is cut off,
It is possible to save more power than in the power saving display state.

Here, in the display power cutoff state, the operation state control unit maintains power supply to at least the projection display control unit which is included in the projection display unit and controls the display mode of a projected image. Preferably.

In this way, the operation of the projection display control unit for controlling the display mode of the projected image is maintained, so that the apparatus does not need to be restarted when the state of the sync signal becomes the input state. The operation state of the projection display unit can be returned to the normal display state.

In addition to the above-mentioned projector configuration, the present invention provides a projector control method, a computer program for implementing the same, a recording medium recording the program, and a data signal embodied in a carrier wave containing the program. It can be realized in various modes.

When the present invention is configured as a computer program or a recording medium recording the program, it may be configured as an entire program for driving the projector, or only a portion that fulfills the functions of the present invention is configured. It may be one. The recording medium may be a flexible disk, a CD-ROM, a magneto-optical disk, an IC card, a ROM cartridge, a punched card, a printed matter on which codes such as a bar code are printed, or an internal storage device of a computer (memory such as RAM or ROM). )
Also, various computer-readable media such as an external storage device can be used.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described in the following order based on examples. A. Overall Configuration of Projector: B. Operating state control: C. Modification:

A. Overall Configuration of Projector: FIG. 1 is an explanatory diagram showing a schematic configuration of a projector 10 as an embodiment of the present invention. The projector 10 includes a projection display unit 1
00, the synchronization signal detector 200, and the operation state controller 30
0 and a power supply unit 400.

The projection display unit 100 includes a signal conversion unit 120.
An image processing unit 130, a liquid crystal panel driving unit 140,
A liquid crystal panel 142 and a projection display control unit 150 are provided. Further, it is provided with an illuminating device 160 for illuminating the liquid crystal panel 142, and a projection optical system 170 for projecting the light transmitted through the liquid crystal panel 142 onto the screen SC.

The signal conversion unit 120 inputs an image signal VS supplied from the outside and converts it into image data in a format that can be processed by the image processing unit 130. The image signal may be an image signal supplied from a personal computer or an image signal supplied from an image reproducing device such as a VTR or a DVD player.

The image processing unit 130 adjusts image quality such as brightness adjustment, color balance adjustment, contrast adjustment, sharpness adjustment, and enlarges / reduces the image size of the image data input through the signal conversion unit 120. Various kinds of image processing such as processing and trapezoidal distortion correction when performing tilted projection by the projector 10 are performed. The parameter values for executing each process are stored in a memory (not shown) of the projection display control unit 150 and set in each block.

The liquid crystal panel drive section 140 is the image processing section 1.
A drive signal for driving the liquid crystal panel 142 is generated based on the image data subjected to the image processing in 30.

The liquid crystal panel 142 is the liquid crystal panel drive unit 1.
The illumination light is modulated according to the drive signal generated at 40.
The liquid crystal panel 142 is a transmissive liquid crystal panel, and is used as a light valve (light modulator) that modulates the illumination light emitted from the lighting device 160.

The projection display control unit 150 has a CP (not shown).
A microcomputer having a U and a memory,
According to various parameters set in the memory, the signal conversion unit 120, the image processing unit 130, and the liquid crystal panel drive unit 140.
Etc. to control the operation of each block.

The lighting device 160 includes a light source lamp 162,
And a lamp driving unit 164. In this embodiment, the light source lamp 162 is an ultrahigh pressure mercury lamp. Other discharge lamps such as a metal halide lamp and a xenon lamp may be used. The lamp driving unit 164 generates a driving signal according to the driving frequency set by the operation state control unit 300, and the light source lamp 16
Drive 2 In addition, the lamp driving unit 164 can change the output power according to the set value set by the operation state control unit 300, and can change the brightness of the illumination light emitted from the light source lamp 162. .

The illumination light modulated by the liquid crystal panel 142 serves as light (image light) representing an image and is projected by the projection optical system 17.
It is emitted toward the screen SC by 0. As a result, the image is projected on the screen SC. The projection magnification of the projection optical system 170 can be controlled by the projection display control unit 150.

Although not shown, the projector 10 includes three liquid crystal panels 142 corresponding to the three colors of RGB. Each of the signal conversion unit 120, the image processing unit 130, and the liquid crystal panel driving unit 140 has a function of processing image data of three colors. The illumination device 160 also includes a color light splitting optical system that splits the light source light into three color lights. Further, the projection optical system 170 has a combining lens and a projection lens that combine the image lights of the three colors to generate image light representing a color image. As for the optical system configuration of such a projector, various general projector optical system configurations can be used.

The synchronizing signal detecting section 200 detects the synchronizing signal included in the image signal VS inputted from the outside and executes the following judgment. That is, it is determined whether the state of the sync signal is the no-input state in which the sync signal is not input or the input state in which the sync signal is input. Further, when the state of the synchronization signal is the input state, the predetermined specification of the synchronization signal for determining the display mode of the input image signal is detected. The detection result of the synchronization signal detection unit 200 is supplied to the projection display control unit 150.

When the input image signal is a component signal separated into a signal representing an image (hereinafter, this signal may be referred to as "image signal") and a synchronization signal, The separated sync signal is input to the sync signal detector 200. On the other hand, if the input image signal is a composite signal (including a sync-on-green signal) in which the image signal and the sync signal are combined, the sync signal detection unit 200 has the composite signal input. The sync signal is separated from the composite signal, and the sync signal detection operation is executed based on the separated sync signal.

The power supply section 400 is controlled by the operation state control section 300 and supplies electric power to each section of the projector 10. Specifically, the operating state control unit 300 is supplied with the first power PSV1, and the projection display control unit 150 of the projection display unit 100 and the synchronization signal detecting unit 200 are supplied with the second power PSV1.
V2 is supplied, and the fourth electric power PSV4 is supplied to the lamp driving unit 164 of the lighting device 160. In addition, the projection display unit 10
The third power PSV3 is supplied to the blocks except the projection display control unit 150 and the lamp driving unit 164 of 0. In addition,
Each power output may include a plurality of outputs instead of one output.

FIG. 2 is an explanatory diagram showing a configuration example of the power supply section 400. The power supply unit 400 includes a main power supply block 410,
And a standby power supply block 420. Electric power PS supplied from the outside is input to the main power supply block 410 and the standby power supply block 420. However, it is input to the main power source block 410 via the main power source switch 430. The main power switch 430 is the operating state control unit 30.
0 is turned on / off according to a first control signal PSC1 and the power PS input to the main power supply block 410 is turned on / off according to a first control signal PSC1 supplied from the operation state control unit 300. .

The main power supply block 410 includes a primary power supply 412.
And a secondary power source 414. Primary power source 412
Outputs the electric power supplied to the secondary power supply 414 based on the electric power PS. In addition, the lamp driving unit 16 of the lighting device 160
The fourth power PSV4 to be supplied to No. 4 is output.

The secondary power supply 414 outputs the first power PSV1 to be supplied to the operating state control section 300 based on the power supplied from the primary power supply 412. In addition, the secondary power source 4
14 includes two regulator blocks 416 and 418, and the first regulator block 416 outputs the second power PSV2 supplied to the projection display control unit 150 and the synchronization signal detection unit 200. This second power PS
In addition, V2 is a block necessary for maintaining various conditions required for normal projection display, that is, when power supply is cut off, V2 is restarted to return to a normal operation state. It is supplied to the various blocks that need it.

The second regulator block 418 outputs the third power PSV3 to be supplied to the blocks 120, 130, 140, 142 of the projection display unit 100 excluding the projection display control unit 150. In addition, the third power PSV2 is supplied to various blocks that have no effect on returning to the normal operating state even if the power supply is cut off. The second regulator block 418 includes the operating state control unit 3
According to the second control signal PSC2 supplied from 00,
The output of the third power PSV3 is turned on / off.

The standby power supply block 420 also includes the primary power supply 42.
2 and a secondary power source 424. Secondary power supply 424
Output of main power supply block 4 via diode 426.
It is connected to the output of 10 secondary power sources 414.

The output voltage of the secondary power source 424 of the standby power source block 420 is set to be lower than the output voltage of the secondary power source 414 of the main power source block 410. Therefore, when the main power supply switch 430 is turned off by the first control signal PSC1 and the power PS is not input to the main power supply block 410, the output of the secondary power supply 424 of the standby power supply block 420 is the first output. It is output as power PSV1. On the other hand, the main power switch 430 is
When the power PS is input to the main power supply block 410 by being turned on by the control signal PSC1 of No. 1, the output of the secondary power supply 414 of the main power supply block 410 is the first power PS.
It is output as V1. In addition, other power PSV2,
PSV3 and PSV4 are also output. However, the third power PSV3 is the second power supplied from the operation state control unit 300.
It is turned on / off according to the control signal PSC2.

The operation state control unit 300 shown in FIG. 1 is operated by a remote controller (not shown) or a button or key provided on the main body of the projector 10 to operate the image processing unit 130 and the projection optical unit via the projection display control unit 150. The system 170 is controlled to control the lamp driving unit 164 and the power supply unit 400.
To control. For example, the operating state control unit 300 sets various parameter values used in the image processing unit 130, and sets the output power and the driving frequency of the lamp driving unit 164. Further, the processing of the image processing unit 130 is controlled according to the state of the synchronization signal detected by the synchronization signal detection unit 200, the output power of the lamp drive unit 164 is changed, and the power supply of the power supply unit 400 is turned on / off. I do. Hereinafter, the control executed by the operation state control unit 300 according to the state of the synchronization signal detected by the synchronization signal detection unit 200 will be described.

B. Operating State Control: FIG. 3 is an explanatory diagram showing operating state control executed by the operating state control unit 300. The synchronization signal detection unit 200 (FIG. 1) constantly detects the presence or absence of the input of the synchronization signal, and the result is the projection display control unit 1
It is supplied to the operation state control unit 300 via 50. It should be noted that the operation state control unit 300 may be directly supplied without using the projection display control unit 150.

The operation state control section 300 determines that the input state of the sync signal is the state in which the sync signal is input (input state).
Or no sync signal is input (no input)
That is, it is determined whether or not an image signal is input (step S10). When it is determined that the image signal is input, the projection display control unit 150 is controlled so that the projection display unit 100 is in the normal display state (step S20). The image signal input presence / absence determination (step S10) is repeated until it is determined that the image signal is not input.

When it is determined that the image signal is not input, the projection display control unit 150 is controlled so that the projection display unit 100 is in the no input display state (step S30). At this time, the image processing unit 130 outputs predetermined image data prepared in advance to the liquid crystal panel drive unit 140. The predetermined image may be, for example, a message image that warns that the image signal is not input, a blue solid image, or the like, but is not limited to this. Any image may be used as long as it is an image associated with. The predetermined image data may be prepared in advance in the image processing unit 130, or may be prepared in advance in the projection display control unit 150 and supplied from the projection display control unit 150 to the image processing unit 130. May be.

Further, the operation state control section 300 sets the operation of the projection display section 100 to the non-input display state as described above, and starts the timer for measuring the preset first time (step S40). . And
Until the time measured by the timer ends (step S7
0), the determination of the presence or absence of the input of the image signal is repeated (step S50). However, when it is determined that the image signal is input, the time counting by the timer is stopped (step S60), and the projection display control unit 150 is controlled so that the projection display unit 100 is in the normal display state (step S2).
0). The first time counted by the timer will be described later.

Even if the time counting by the timer is finished (step S70), if the image signal is still not input, the operation state control unit 300 controls the lamp driving unit 164 of the lighting device 160 to control the light source lamp. The illumination light of 162 is dimmed to bring the projection display unit 100 into a power saving display state (step S80). At this time, as the image to be displayed, the display of the image associated with the no-input operation state displayed before dimming may be maintained, or a different image may be displayed. .

Further, the operation state control section 300 reduces the illumination light of the light source lamp 162 as described above, and
A timer for measuring the preset second time is newly started (step S90). Then, until the time measurement by the timer is completed (step S1
20) and the determination of the presence or absence of the input of the image signal is repeated (step S100). However, when it is determined that the image signal is input, the time counting by the timer is stopped (step S60), and the projection display control unit 150 is controlled so that the projection display unit 100 is in the normal display state (step S2).
0). The second time counted by the timer will be described later.

Even when the time counting by the timer is finished (step S120), if the no-input state of the image signal still continues, the operation state control unit 300 causes the second regulator block 418 (see FIG. The operation of 2) is stopped and the output of the third power PSV3 is turned off (step S130). As a result, the projection display unit 100
Of the above, the signal conversion unit 12 other than the projection display control unit 150
0, power supply to each block of the image processing unit 130, the liquid crystal panel drive unit 140, the liquid crystal panel 142, and the like is stopped, and the projection display on the projection display unit 100 is stopped.
This state corresponds to the display power cutoff state of the present invention.

Further, the operation state control section 300 cuts off the power supply to some blocks of the projection display section 100 to bring it into the display power cutoff state as described above, and sets the preset third time. A timer for measuring time is newly started (step S140). Then, the input signal presence / absence determination is repeatedly performed until the timer completes the time counting (step S170) (step S15).
0). However, when it is determined that the image signal is input, the time measurement by the timer is stopped (step S16).
0), the projection display control unit 150 is controlled so that the projection display unit 100 is in the normal display state (step S20). The third time counted by the timer will be described later.

Even when the time counting by the timer is finished (step S170), if the image signal is still not input, the operation state control unit 300 turns off the main power switch 430 in the power supply unit 400. , The operation of the apparatus is stopped (step S180).

Even when the main power supply is turned off, power is supplied from the standby power supply block 420 to the operating state control unit 300, so the user restarts the device by inputting an operation key such as a remote controller. can do.

As described above, in this embodiment, even if the image signal is in the no input state, the image corresponding to the no input state is displayed (no input display state). When the no-input state continues for a certain period of time, the light source lamp 162 can be dimmed to save the operation of the apparatus (power saving display state). Further, when the no-input state continues for a certain period of time, the power supply to each block included in the projection display unit 100 other than the projection display control unit 150 that controls the projection display is cut off. Further, it is possible to further reduce the power consumption by turning off the light source lamp 162, stopping the projection display by the projection display unit 100, and reducing the illumination light of the light source lamp 162 (display power cutoff state).

Further, in the present embodiment, power is saved by dimming the illumination light of the light source lamp 162 to enter the power-saving display state, and it is not the image data supplied from the outside but the non-input operation state. It is the same as the normal display state except that an image is displayed by the associated image data and the illumination light of the light source lamp 162 is dimmed. Therefore, when the input of the image signal is restarted during the power saving display state, the light source lamp 162 is returned to the normal illumination state, and the image based on the input image signal is displayed so that the apparatus is re-activated. It is possible to easily return to the normal display state without activating.

Further, in this embodiment, among the blocks included in the projection display unit 100, the power supply to each block other than the projection display control unit 150 for controlling the projection display is shut off, and the light source lamp 162 is turned off. By setting the display power cut-off state, the power saving is measured more than the power saving display state. As described above, the projection display unit 10
Various conditions such as parameters set in each block of 0 are set via the projection display control unit 150. Therefore, even if the power supply to some blocks of the projection display unit 100 is cut off, if the power supply to the projection display control unit 150 is maintained, the input of the image signal is restarted during the display power cutoff state. In this case, by restarting the interrupted power supply and displaying the image based on the input image signal, it is possible to easily return to the normal display state without restarting the device. .

The time measured by the timer when no image signal is input is set as follows, for example. FIG. 4 is an explanatory diagram showing an example of setting the time count of the timer. In the example of FIG. 4, the time count in the no-input display state is 5 minutes, and the time in the power saving display state is 10 minutes.
Minutes, the time in the display power cutoff state is set to 7 to 8 minutes. This setting is determined in consideration of the following points.

After the image signal is not input for a certain period of time and then the input is restarted, the reproduction software such as a DVD or a video tape or the reproduction device is changed, the video tape is rewound or fast-forwarded. Etc. are possible.
In such a situation, empirically, there is a possibility that the no-signal state will occur for at least about 15 minutes. Further, once the light source lamp is turned off, a certain period of cooling time (about 60 seconds in forced air cooling by a cooling fan) is required to turn on the light source lamp again.

Therefore, the total time of the non-input operation state and the power saving operation state is set to 15 minutes. In addition, as the time for turning off the circuit power to be in the display power cutoff state, it is set to 7 to 8 minutes in consideration of the cooling time and the time for allowing recovery by restarting the input.

Further, the degree of dimming of the illumination light of the light source lamp 162 in the power saving display state is not particularly limited, and it is what extent the dimming light is diminished as compared with the illumination light in the normal display state. May be. However, in the ultra-high pressure mercury lamp used in this example, the state where the arc discharge can be maintained in a stable state is 80 to 85% of the normal rated output.
This is the case with the above electric power, and if the electric power is less than this, deterioration of the lamp life and flicker generally occur. Therefore, the degree of dimming in the power saving display state is preferably 80 to 85% of the normal rated output.

C. Modifications: The present invention is not limited to the above-described embodiments and embodiments, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are also possible. is there.

The set time of the timer is not limited to the time shown in the above embodiment, but various times can be set. Further, the set time of the timer may be arbitrarily set by an operation key such as a remote controller.

In the above embodiment, the case where the operation state of the projection display unit is set to the non-input display state, the power saving display state, or the display power cutoff state when the state of the synchronization signal is the no input state will be described. However, the present invention is not limited to this, and when one of the horizontal sync signal and the vertical sync signal of the sync signal is in the non-input state, the operation state of the projection display unit is changed to the non-input display state. Alternatively, the power saving display state or the display power cutoff state may be set.

In the above embodiment, the configuration of the projector using the transmissive liquid crystal panel has been described, but the present invention can be applied to other types of projectors. Other types of projectors include those using a reflective liquid crystal panel and those using a digital micromirror device (trademark of Texas Instruments Incorporated).

In this embodiment, the light source lamp is dimmed as the power saving operation state to show the power saving display state.
Without being limited to this, when the state of the synchronization signal changes from the no-input state to the input state, that is, when the image signal changes from the no-input state to the input state, the device is not restarted. Any state may be used as long as the operation state of the projection display unit can be returned to the normal display state and power saving is performed as compared with the no input display state.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of a projector 10 as an embodiment of the invention.

FIG. 2 is an explanatory diagram showing a configuration example of a power supply section 400.

FIG. 3 is an explanatory diagram showing operation state control executed by an operation state control unit 300.

FIG. 4 is an explanatory diagram showing an example of setting a time count of a timer.

[Explanation of symbols]

10 ... Projector 100 ... Projection display section 120 ... Signal converter 130 ... Image processing unit 140 ... Liquid crystal panel drive unit 142 ... Liquid crystal panel 150 ... Projection display control unit 160 ... Lighting device 162 ... Light source lamp 164 ... Lamp driving unit 170 ... Projection optical system 200 ... Sync signal detector 300 ... Operation state control unit 400 ... Power supply unit 410 ... Main power supply block 412 ... Primary power supply 414 ... Secondary power supply 416, 418 ... Regulator block 420 ... Standby power block 422 ... Primary power supply 424 ... Secondary power supply 426 ... Diode 430 ... Main power switch PS ... power PSC1 ... First control signal PSC2 ... Second control signal PSV1, PSV2, PSV3, PSV4 ... Electric power SC ... Screen VS ... Image signal

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) G09G 3/20 680 G09G 3/20 680C 3/34 3/34 J 3/36 3/36 H04N 5/74 H04N 5 / 74 ZF Term (reference) 2K103 AA05 BA14 BA15 CA54 CA60 CA64 5C006 AA01 AF45 AF46 AF51 AF53 AF61 AF69 AF71 BB11 BB29 BF14 BF24 EA01 EC11 FA11 FA47 5C058 BA26 BA29 EA01 EA02 BB02 JJ02 GG02 DD08 DD26 DD26 DD26 DD26

Claims (3)

[Claims] 1. A projector for projecting an image, comprising: a projection display section for projecting an image according to an input image signal; and a sync signal detecting section for detecting a state of a sync signal indicating timing of the image signal. An operation state control unit that controls an operation state of the projection display unit according to a state of the synchronization signal, wherein the operation state control unit receives the synchronization signal when the state of the synchronization signal is input. When the input state is present, the operation state of the projection display unit is set to a normal display state in which an image according to the input image signal is displayed, and the state of the synchronization signal is changed from the input state to the synchronization state. When there is no signal input and there is no input,
The operation state of the projection display unit is a no-input display state in which an image corresponding to the no-input state prepared in advance in the projection display unit is displayed, and the operation state of the projection display unit changes from the normal display state to the normal display state. When the non-input display state is entered and the non-input state is continued for the first period, the illumination light of the illumination device used for projecting an image by the projection display unit is changed to the illumination light in the non-input display state. In comparison, the operating state of the projection display unit is changed to a power-saving display state in which power is saved compared to the non-input display state by dimming, and the synchronization is performed in the no-input display state or the power-saving display state. A projector, wherein when the signal state is the input state, the operation state of the projection display unit is returned to the normal display state. 2. The projector according to claim 1, wherein the operation state control unit changes the operation state of the projection display unit from the no-input display state to the power-saving display state, and the no-input state is the second input state. The projector is characterized in that when the period is continued, the operation state of the projection display unit is set to a display power cutoff state in which a part of the power supply to the projection display unit is cut off. 3. The projector according to claim 2, wherein the operation state control unit is included in at least the projection display unit and controls a display mode of a projected image in the display power cutoff state. A projector that maintains power supply to a display control unit.