JP2005031413A - Projection type display device and projection type display system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a situation that a power source of a projector (projection type display device) is turned off prior to a PC (computer). <P>SOLUTION: The projection type display device for projecting an image onto a projection surface based on an inputted image signal is provided with: an operation part for receiving an operation to turn off a power source of the device main body; an input signal confirmation part for confirming the presence or absence of an input of the image signal; and a control part which does not turn off the power source of the device main body but warns that the input of the image signal is present when the operation to turn off the power source of the device main body is received by the operation part, and the presence of the input of the image signal is confirmed by the input signal confirmation part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a projection display device such as a liquid crystal projector or a DLP (Digital Light Processing) projector, and further to a projection display system in which a computer such as a personal computer (PC) is connected to the projection display device.
[0002]
[Prior art]
Generally, a discharge lamp such as a xenon lamp, a halogen lamp, or a metal halide lamp is used as a light source of a projector. This discharge lamp has many restrictions on the temperature, and it is necessary to control the temperature over a long time when it is turned on and off. In particular, once the discharge lamp is turned off, it cannot be turned on again immediately after that, and it is necessary to wait for some time before turning it on again.
[0003]
On the other hand, as described in Patent Document 1 and Patent Document 2, as a conventional technology, a projector is connected to a PC that outputs an image signal of a projected image, and a meeting or presentation is performed as a set of projection display systems. It is often used for etc.
[0004]
When a desktop PC main body or the like is used as the PC of such a projection display system, if a projector is turned off after a meeting or presentation, the desktop PC main body has a dedicated monitor. Therefore, the user cannot shut down by clicking the display button on the PC screen. Therefore, it is necessary to turn on the power of the projector again and turn on the discharge lamp. However, this requires a lot of time, which makes the user unusable.
[0005]
On the other hand, in the conventional projector, as shown in FIG. 9, the power-off operation key that does not turn off unless the power-off operation key is pressed twice in S91 and S92, and the power-off operation key are predetermined. A measure has been taken to prevent the projector from turning off with a simple key operation by providing a long-press function such that the power will not turn off unless the button is pressed for a long time.
[0006]
[Patent Document 1]
JP 2002-252880 A [Patent Document 2]
JP-A-2002-297119
[Problems to be solved by the invention]
However, even if the projector has such a double-pressing function or a long-pressing function, when the user tries to turn off the power of the projector, the user unconsciously presses it twice or presses and presses the PC. Before that, the projector was turned off and the PC could not be shut down.
[0008]
Therefore, the present invention is for solving the above-described problems, and an object of the present invention is to prevent a situation in which a projector (projection display device) is turned off before a PC (computer).
[0009]
[Means for Solving the Problems]
In order to solve the above object, a projection display device according to a first aspect of the present invention is a projection display device that projects an image on a projection surface based on an input image signal. An operation unit that accepts an operation to turn off, an input signal confirmation unit that confirms whether or not the image signal is input, and an operation that turns off the power of the apparatus main body by the operation unit are accepted, and the image signal is received by the input signal confirmation unit. And a control unit that issues a warning that the image signal is input without turning off the power of the apparatus main body.
[0010]
Furthermore, when the warning is issued by the control unit, a warning message corresponding to the warning is displayed in an overlapping manner on an image generated based on the image signal. In addition, a warning sound or a warning sound is generated when the warning is issued by the control unit.
[0011]
Furthermore, the control unit turns off the power of the apparatus body when the input signal confirmation unit confirms that the image signal is not input after issuing the warning.
[0012]
Furthermore, the image signals are sequentially input from a computer at a predetermined cycle, and the input signal confirmation unit confirms whether or not the image signals are input within a predetermined time.
[0013]
A projection display system according to a second aspect of the present invention includes a computer that generates and outputs an image signal, a projection unit that projects an image on a projection surface based on the image signal output from the computer, and a projection An operation unit that accepts an operation to turn off the power of the display-type display device main body, an input signal confirmation unit that confirms whether or not the image signal is input, and an operation to turn off the power of the projection-type display device main body by the operation unit are accepted And a control unit that issues a warning that the image signal is input without turning off the power of the projection display device body when the input signal confirmation unit confirms that the image signal is input. And a projection type display device.
[0014]
Further, the computer is shut down by using a display button on the image projected on the projection surface.
[0015]
A projection display system according to a third aspect of the present invention includes a computer that generates and outputs an image signal, a projection unit that projects an image on a projection surface based on the image signal output from the computer, and a projection An operation unit that accepts an operation to turn off the power of the display-type display device main body, an input signal confirmation unit that confirms whether or not the image signal is input, and an operation to turn off the power of the projection-type display device main body by the operation unit are accepted And a control unit that outputs a request to shut down the computer without turning off the power of the projection display device body when the input signal confirmation unit confirms that the image signal is input. A projection display device, and the projection display device main body is turned off after the computer is shut down. .
[0016]
DETAILED DESCRIPTION OF THE INVENTION
[Example 1]
First, the configuration of the projector according to the first embodiment will be described with reference to FIG.
[0017]
In FIG. 1, a projector main body 1 includes a CPU 2, an image signal processing unit 3, a synchronization signal detection unit 4, an OSD (On Screen Display) memory unit 5 for storing a warning message, an OSD processing unit 6, a liquid crystal panel driving unit 7, a liquid crystal Panel 8, power supply unit 9, ballast (power circuit for driving the light source) 10, light source (discharge lamp) 11, projection lens 12, various operation keys 14, infrared light receiving unit (IR) 15, remote control 16, image input terminal 17 It is comprised by.
[0018]
The CPU 2 is a control unit that controls each unit in the projector main body 1 according to various programs stored in a ROM or the like. The image signal processing unit 3 performs data processing on each image frame based on image signals sequentially input from the PC via the image input terminal 17 in a predetermined cycle, and determines the gradation of each pixel. Normally, the cycle in which the PC outputs an image signal, that is, the frame data update cycle (claim rate) is about 50 to 90 Hz, and the same image signal is sequentially output when a still image is projected and displayed.
[0019]
The synchronization signal detection unit 4 detects a horizontal synchronization signal and a vertical synchronization signal from the input image signal, and includes an input signal confirmation unit that confirms whether or not an image signal is input based on the detection result. Whether or not an image signal is input is confirmed by whether or not a horizontal synchronizing signal and a vertical synchronizing signal are detected from the image signal within a predetermined time corresponding to a predetermined period input from the PC.
[0020]
The OSD memory unit 5 stores data such as a warning message. When the OSD processing unit 6 receives an OSD display command from the CPU 2, the OSD memory unit 5 reads the stored data from the OSD memory unit 5, and the image signal processing unit. 3 is performed. On the other hand, when there is no OSD display command, the data processed by the image signal processing unit 3 is not displayed on the liquid crystal panel. This is output to the drive unit 7.
[0021]
The liquid crystal panel driving unit 7 considers the voltage-transmittance characteristics of the liquid crystal panel 8, converts the gradation value of each pixel into a voltage value, applies a voltage to the liquid crystal panel 8, and applies light to each pixel of the liquid crystal panel 8. The transmittance is adjusted.
[0022]
The power supply unit 9 supplies power to the ballast 10 and the above-described units (arrows are omitted in the drawing). The discharge lamp 11 is driven by the ballast 10, and the generated light irradiates the liquid crystal panel 8. Then, the light is focused on the liquid crystal panel 8 according to the gradation of each pixel, and is projected and displayed on the screen (projection surface) 13 through the projection lens 12.
[0023]
An operation unit such as the operation key 14 and IR 15 (a receiving unit that receives an operation with the remote controller 16) receives an operation for turning on or off the power of the projector body 1 and transmits it to the CPU 2.
[0024]
Next, the power-off processing operation according to the first embodiment will be described with reference to FIG.
[0025]
First, in order to turn off the projector, when the user presses the operation key 14 or the power key of the remote controller 16 (S21), the input signal confirmation unit in the synchronization signal detection unit 4 inputs an image signal from the PC. The presence or absence is confirmed (S22).
[0026]
When it is confirmed that there is an input of an image signal, the CPU 2 instructs the OSD processing unit 6 to project a warning message indicating that there is an input of the image signal as shown in FIG. The image is overlaid on the image and notified to the user (S23). With this warning message, the user notices that the user has made an erroneous operation to turn off the power of the projector prior to the PC even though an image signal is being input from the PC. Thereafter, the user can delete only the warning message from the projected image, for example, by pressing the power key again, and execute the shutdown of the PC using the projected image.
[0027]
On the other hand, if it is confirmed in S22 that no image signal is input, S23 is skipped and no warning message is displayed.
[0028]
Subsequently, when the user presses the power key again as a final confirmation of power off (S24), the power of the projector is turned off.
[0029]
As described above, when an image signal is input when trying to turn off the power, the user needs to press the power key three times. It is possible to prevent a situation where the power of the projector is turned off earlier than that.
[0030]
In the first embodiment, as a warning to the user, the OSD processing unit 6 causes the warning message to be superimposed on the projected image. However, instead of such a warning message or in combination with the warning message, the warning message is displayed. It is also possible to generate warning sounds such as alarms and warning sounds such as language sounds.
[0031]
[Example 2]
The power-off processing operation according to the second embodiment will be described with reference to FIG.
[0032]
The second embodiment is a modification of the first embodiment, and steps (S31 to S33) from when the power key is first pressed until a warning message is displayed are the same as S21 to S23 in the first embodiment. This is the same and will not be described. The second embodiment is different from the first embodiment in that, following S33, the PC is shut down, and after the image signal is no longer input from the PC, the power of the projector is automatically turned on without having to press the power key. Is added, and the flow from S34 will be described below.
[0033]
In S34, as shown in FIG. 8B, after the image signal is no longer input from the PC, a warning message for asking the user whether or not to select a mode for automatically turning off the projector is displayed. The image is again displayed on the projected image. Thereafter, the user uses the operation key 14 or the remote controller 16 to input whether or not to perform mode selection.
[0034]
In S35, when the user inputs a mode selection in S34, the input signal confirmation unit in the synchronization signal detection unit 4 confirms again whether or not an image signal is input, and confirms that there is no image signal input. After that, the projector is automatically turned off.
[0035]
[Example 3]
The third embodiment is a modification of the first embodiment, and differs from the first embodiment in that when the image output device that outputs an image signal to the projector is a PC, command communication such as USB (Universal Serial Bus) or the like. This is to add a function of shutting down the PC using the line and then turning off the power of the projector.
[0036]
First, the configuration of the projection display system according to the third embodiment will be described with reference to FIG.
[0037]
In FIG. 7, the projector 1 and the PC 19 are connected by two lines. The image input terminal 17 of the projector 1 and the image output terminal 20 of the PC 19 are connected by a VGA cable 21 or the like, and an image signal is transmitted from the PC 19 to the projector 1. A USB interface 23 is provided on the projector 1 side, and a USB host controller 22 is provided on the PC 19 side. Both are connected by a USB cable 24, and commands are transmitted and received between the PC 19 and the projector 1.
[0038]
Next, the power-off operation on the projector side according to the third embodiment will be described with reference to FIG.
[0039]
Steps (S41 to S43) from when the power key is pressed for the first time until the warning message is displayed are the same as S21 to S23 in the first embodiment, and description thereof is omitted.
[0040]
In S44, it is determined whether the image signal is output from the PC based on the input cycle of the image signal. That is, when the frame rate is about 50 to 90 Hz, it is determined that the image signal is from the PC. Further, when the image signal is a sync on green signal (a green (G) signal among the image signals includes a synchronization signal), it may be determined that the image signal is from a PC. If the image signal is not from a PC, the process proceeds to final confirmation of power off (SS41).
[0041]
On the other hand, when the input signal is a PC, a warning message asking whether to output a request for shutting down the PC 19 from the projector 1 side using the command communication line as shown in FIG. It is displayed by OSD processing (S45). Thereafter, the user uses the operation key 14 or the remote control 16 to select whether or not to output a shutdown request.
[0042]
When the user selects to output a shutdown request, the projector 1 sends a shutdown request to the PC 19 via USB (S46). The USB host controller 22 on the PC 19 side receives the request and shuts down the PC 19. On the other hand, if the user selects not to output a shutdown request, the process proceeds to the final confirmation of power off (SS41).
[0043]
On the projector 1 side, after outputting a shutdown request, the input signal confirmation unit in the synchronization signal detection unit 4 confirms again whether or not an image signal is input (S47), and the power is automatically turned off.
[0044]
That is, the projector 1 is also automatically turned off on the condition that the synchronization signal is lost. If it is selected that the PC 19 is not shut down from the projector 1, the process proceeds to the final confirmation of power off.
[0045]
Next, the power-off operation on the PC side according to the third embodiment will be described with reference to FIG.
[0046]
On the PC 19 side connected to the projector 1 via USB, the shutdown is performed when the keyboard 19 or mouse operation of the PC 19 or the shutdown request from the projector 1 is received (polling).
[0047]
In the third embodiment, USB is used as the command communication line, but communication means such as RS232C may be used instead.
[0048]
[Example 4]
FIG. 5 is a flowchart illustrating a power-off process operation flow according to the fourth embodiment.
[0049]
The fourth embodiment includes both the function described in the second embodiment and the function described in the third embodiment, and detailed description thereof is omitted.
[0050]
【The invention's effect】
As described above, according to the present invention, it is possible to prevent the projector (projection display device) from being turned off before the PC (computer).
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a projector according to a first embodiment.
FIG. 2 is a power-off process operation flow according to the first embodiment.
FIG. 3 is a flowchart of a power-off process operation according to the second embodiment.
FIG. 4 is a flowchart of a power-off process operation on the projector side according to the third embodiment.
FIG. 5 is a power off process operation flow according to the fourth embodiment.
FIG. 6 is a flowchart of a power-off process operation on the PC side according to the third embodiment.
7 is a configuration diagram of a projection display system according to Embodiment 3. FIG.
8A is an example of a message notifying that there is a PC input, FIG. 8B is an example of a message for automatically asking to select a projector power-off mode after the PC input is lost, and FIG. An example of a message asking you to select whether to output a request.
FIG. 9 is a flowchart of a power-off processing operation in the prior art.
[Explanation of symbols]
1 Projector 2 CPU
3 Image signal processing unit 4 Synchronization signal detection unit 5 OSD memory unit 6 OSD processing unit 7 Liquid crystal panel drive unit 8 Liquid crystal panel 9 Power supply unit 10 Ballast 11 Discharge lamp 12 Projection lens 13 Screen 14 Operation key 15 IR
16 Remote control 17 Image input terminal 18 Power plug 19 PC
20 Image output terminal 21 VGA cable 22 USB host controller 23 USB interface 24 USB cable

Claims (8)

In a projection display device that projects an image on a projection surface based on an input image signal,
An operation unit for accepting an operation to turn off the power of the apparatus body;
An input signal confirmation unit for confirming the presence or absence of input of the image signal;
When an operation for turning off the power of the apparatus main body is accepted by the operation unit and the input signal confirmation unit confirms that the image signal is input, the input of the image signal is performed without turning off the power of the apparatus main body. And a control unit that issues a warning that there is a projection. 2. The projection according to claim 1, wherein when the warning is issued by the control unit, a warning message corresponding to the warning is displayed in an overlapping manner on an image generated based on the image signal. Type display device. The projection display device according to claim 1, wherein when the warning is issued by the control unit, a warning sound or a warning sound is generated. The said control part turns off the power supply of an apparatus main body, when it is confirmed by the said input signal confirmation part that there is no input of the said image signal after issuing the said warning. A projection display device according to any one of the above. 5. The image signal is sequentially input from a computer in a predetermined cycle, and the input signal confirmation unit confirms whether or not the image signal is input within a predetermined time. The projection display device according to any one of the above. A computer that generates and outputs an image signal;
Based on the image signal output from the computer, a projection unit that projects an image on a projection surface, an operation unit that receives an operation for turning off the power of the projection display main body, and whether or not the image signal is input is confirmed. When the operation for turning off the power of the projection display device main body is accepted by the input signal confirmation unit and the operation unit, and the input signal confirmation unit confirms that the image signal is input, the projection display device A projection display system, comprising: a control unit that issues a warning that the image signal is input without turning off the power of the main body. The projection type display system according to claim 6, wherein the computer is shut down using a display button on an image projected on a projection surface. A computer that generates and outputs an image signal;
Based on the image signal output from the computer, a projection unit that projects an image on a projection surface, an operation unit that receives an operation for turning off the power of the projection display main body, and whether or not the image signal is input is confirmed. When the operation for turning off the power of the projection display device main body is accepted by the input signal confirmation unit and the operation unit, and the input signal confirmation unit confirms that the image signal is input, the projection display device A projection display device comprising: a control unit that outputs a request to shut down the computer without turning off the power of the main body;
A projection display system, wherein the power supply of the projection display device main body is turned off after the computer is shut down.

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