JP2012003043A - Projector and method for controlling projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector that can prevent the recurrence of an abnormality when a direct ON mode is set.SOLUTION: A projector 1 comprises: a mode setting unit 24 that can set a direct ON mode for starting turning on a light source 11 when power is supplied from an external power source; an abnormality detection unit for detecting an abnormality of the projector 1; an abnormality storage unit 23 for storing the abnormality detected by the abnormality detection unit as abnormality information; an abnormality notification unit (LED 27) for notifying the abnormality information stored in the abnormality storage unit 23; and a controlling unit 20 for controlling the operation of the projector 1. In a first state where power from the external power source is cut, when the direct ON mode is set at the mode setting unit 24 and the abnormality information is stored in the abnormality storage unit 23, supplying power from the external power source causes the controlling unit 20 to switch the state to a second state where the abnormality notification unit notifies the abnormality information without turning on the light source 11.

Description

  The present invention relates to a projector and a projector control method.

  Conventionally, projectors that have a mode (hereinafter referred to as “direct on mode”) in which projection is started by turning on the light source of the projector when power is supplied from a commercial power source (AC power source) are known. It has been. According to such a projector having the direct on mode, projection is started only by supplying power from a commercial power source, so that a power on operation with the power key is not required. Therefore, for example, when a plurality of projectors are used in combination, or when a projector is used in combination with other devices, it is possible to perform power on and power off collectively as a system, which is effective. .

  On the other hand, for example, when an abnormality such as a high temperature abnormality or a sensor abnormality is detected, the projector turns off the light source for safety, stops the projection and shifts to a standby state. Is provided.

  Here, when a projector having such a direct-on mode is used in the above-described system mode, when a projection image is not monitored by a user (for example, use in an amusement facility or electronic There was a use form as a signboard). When monitoring by the user is not performed in this way, even if the projector detects any abnormality and enters standby mode, the user does not notice the abnormality and shuts off the power from the commercial power supply. There was a case. In such a case, when power is supplied from the commercial power source to the projector next time by the user, the projector starts projection in the direct on mode.

  In Patent Document 1, when activated by AC on start (direct on mode), an image display device that turns off a light source lamp and shifts to a standby state when a no-video input signal state continues for a predetermined period of time ( Projector).

JP 2007-72322 A

  However, even in such a projector, after the user cuts off the power from the commercial power supply without noticing the abnormality of the projector, when the power is supplied from the commercial power supply, the projector turns on the light source in the direct on mode, At least a predetermined time of projection is performed. Then, by performing projection in this way, the projector may reoccur the abnormality that occurred last time. In other words, in the conventional projector, the abnormality may not be recognized by the user, and the abnormality may reoccur due to the lighting of the light source in the direct on mode.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A projector according to this application example is a projector having an image projection unit that modulates and projects light emitted from a light source into image light according to image information, and is supplied with power from an external power source. A mode setting unit capable of setting one of a first mode for starting lighting of the light source when the power is supplied, or a second mode for not lighting the light source when power is supplied from the external power source; An abnormality detection unit that detects an abnormality of the projector, an abnormality storage unit that stores the abnormality detected by the abnormality detection unit as abnormality information, an abnormality notification unit that notifies the abnormality information stored by the abnormality storage unit, and A control unit that controls the operation of the projector, wherein the control unit has the first mode setting unit in the first state in which power from the external power source is cut off. When the power is supplied from the external power source when the abnormality information is stored in the abnormality storage unit, the abnormality notification unit is turned on without turning on the light source. It switches to the 2nd state which alert | reports the said abnormality information, It is characterized by the above-mentioned.

  According to such a projector, the mode setting unit can set either the first mode or the second mode. The abnormality detection unit detects an abnormality of the projector. The abnormality storage unit stores abnormality information. The abnormality notification unit notifies the user of abnormality information. The control unit supplies power from the external power source when the first mode is set and abnormality information is stored in the first state where the power from the external power source is cut off. If it does, it will switch to the 2nd state which alert | reports abnormality information, without lighting a light source. As a result, when the user cuts off the power from the external power supply without noticing that the projector is abnormal, and the power is supplied from the external power supply, the projector does not turn on the light source. It is possible to prevent the abnormality from recurring. Further, the user can recognize the abnormality of the projector by notifying abnormality information. Then, the user can take measures against the abnormality.

  Application Example 2 The projector according to the application example further includes an operation reception unit that receives an operation on the projector, and a message screen storage unit that stores message screen information for representing the abnormality information as a message screen. In the second state, when the control unit receives the first operation by the operation receiving unit, the control unit causes the image projection unit to turn on the light source and adds the message screen information stored in the message screen storage unit to the message screen information. It switches to the 3rd state which projects the corresponding image light, It is characterized by the above-mentioned.

  According to such a projector, the operation reception unit receives an operation on the projector. The message screen storage unit stores message screen information representing abnormality information. Then, when receiving the first operation in the second state, the control unit switches to the third state in which the light source is turned on and the image light according to the message screen information is projected. Thereby, the user can visually recognize the abnormality information of the projector on the projected message screen. Further, if a countermeasure method for an abnormality is displayed on the message screen, the user can recognize the countermeasure method.

  Application Example 3 In the projector according to the application example described above, the projector further includes an image information input unit to which the image information is input, and the control unit performs a second operation by the operation reception unit in the third state. When accepted, the image projection unit terminates the projection of the image light according to the message screen information, and switches to the fourth state in which the image light according to the image information input to the image information input unit is projected. It is characterized by.

  According to such a projector, image information is input to the image information input unit. When the control unit receives the second operation in the third state, the control unit ends the projection of the image light according to the message screen information and switches to the fourth state in which the image light according to the input image information is projected. . Accordingly, the user can cancel the projection of the message screen of the abnormality information of the projector, and can start viewing an image corresponding to the input image information (hereinafter referred to as “input image”).

  Application Example 4 The projector according to the application example further includes an image information input unit to which the image information is input, and the control unit projects the image when a predetermined time has elapsed in the third state. The projector is switched to a fourth state in which the projection of the image light according to the message screen information is terminated and the image light according to the image information input to the image information input unit is projected.

  According to such a projector, image information is input to the image information input unit. When a predetermined time elapses in the third state, the control unit ends the projection of the image light according to the message screen information, and switches to the fourth state in which the image light according to the input image information is projected. Thereby, the user can cancel the projection of the abnormality information of the projector and start viewing the input image.

  Application Example 5 A projector control method according to this application example is a projector control method including an image projection unit that modulates light emitted from a light source into image light according to image information, and projects the image light. Either a first mode in which lighting of the light source is started when power is supplied from a power source or a second mode in which the light source is not turned on when power is supplied from the external power source is set. A mode setting step, an abnormality detection step for detecting an abnormality of the projector, an abnormality storage step for storing the abnormality detected by the abnormality detection step as abnormality information, and the abnormality information stored by the abnormality storage step. An abnormality notifying step for notifying, wherein the first mode is set by the mode setting step, and When the abnormality information is stored in the normal storage step, in the first state where the power from the external power source is cut off, when power is supplied from the external power source, the light source is not turned on, And a control step of switching to a second state in which the abnormality information is notified by the abnormality notification step.

  According to such a projector control method, when the user cuts off the power from the external power source without noticing that the projector is abnormal, Since the light source is not turned on, it is possible to prevent the abnormality from recurring. Further, the user can recognize the abnormality of the projector by notifying abnormality information. Then, the user can take measures against the abnormality.

  Further, when the projector and the control method thereof are constructed using a computer provided in the projector, the form and the application example described above are a program for realizing the function, or the program is stored in the computer. It is also possible to constitute in the form of a recording medium or the like recorded so as to be readable by the user. Recording media include flexible disks, hard disks, CD-ROM (Compact Disk Read Only Memory), DVD (Digital Versatile Disk), Blu-ray Disc (registered trademark), magneto-optical disk, nonvolatile memory card, internal storage of projector Use various computer-readable media such as devices (semiconductor memories such as RAM (Random Access Memory) and ROM (Read Only Memory)) and external storage devices (USB (Universal Serial Bus) memory, etc.). Can do.

1 is a block diagram showing a schematic configuration of a projector according to an embodiment. The state transition diagram of a projector. 6 is a flowchart of processing when power is supplied from a commercial power supply in a power-off state of the projector. The flowchart of the process in the abnormal standby state of a projector. Explanatory drawing of the error message screen in case of high temperature abnormality. The flowchart of the process in the abnormal message projection state of a projector. The flowchart of the process in the normal projection state of a projector. The flowchart of the process in the normal standby state of a projector.

  Hereinafter, embodiments will be described.

(Embodiment)
In the present embodiment, a projector capable of preventing the recurrence of an abnormality even when the direct-on mode is set will be described.

  FIG. 1 is a block diagram illustrating a schematic configuration of a projector according to the present embodiment. The internal configuration of the projector 1 will be described with reference to FIG.

  The projector 1 includes an image projection unit 10, a control unit 20, an operation reception unit 21, a temperature detection unit 22, an abnormality storage unit 23, a mode setting unit 24, a light source control unit 25, an LED control unit 26, an LED 27, and an image information input unit 31. An image processing unit 32, an OSD (on-screen display) processing unit 33, and the like.

  The image projection unit 10 includes a discharge light source such as an ultra-high pressure mercury lamp and a metal halide lamp, or a light source 11 including a solid light source such as an LED (Light Emitting Diode) or a laser, a liquid crystal light valve 12 as a light modulation device, and a projection. A lens 13 and a light valve driving unit 14 for driving the liquid crystal light valve 12 are provided.

  The liquid crystal light valve 12 is configured by a transmissive liquid crystal panel in which liquid crystal is sealed between a pair of transparent substrates. When a driving voltage corresponding to an image signal is applied to each pixel of the liquid crystal light valve 12 by driving the light valve driving unit 14, each pixel transmits light source light with a light transmittance corresponding to the image signal.

  The light emitted from the light source 11 is modulated by passing through the liquid crystal light valve 12, and the modulated light is projected by the projection lens 13, whereby an image corresponding to the image signal is displayed on the screen SC or the like. The

  The control unit 20 includes a CPU (Central Processing Unit), a RAM used for temporary storage of various data, and a non-volatile memory such as a mask ROM, flash memory, FeRAM (Ferroelectric RAM), etc. (Not shown) and functions as a computer. The control unit 20 performs overall control of the operation of the projector 1 by the CPU operating according to a control program stored in a nonvolatile memory.

  Further, the control unit 20 detects an abnormality based on information notified from the temperature detection unit 22 or the light source control unit 25. The control unit 20 at this time corresponds to an abnormality detection unit. The control unit 20 includes a timer 20a that measures time. In the present embodiment, the timer 20a measures 30 seconds as the predetermined time for projecting the abnormal message screen.

  The operation reception unit 21 includes a plurality of keys and the like for issuing various instructions to the projector 1. As keys provided in the operation receiving unit 21, a “power key” for turning on / off the power, an “input switching key” for switching an input image signal, and a menu screen for performing various settings are displayed. There are “menu key” for switching / non-display, “cursor key” used for moving the cursor on the menu screen, “decision key” for determining various settings, and the like. When the user operates the operation reception unit 21, the operation reception unit 21 outputs control information corresponding to the operation content of the user to the control unit 20. The operation receiving unit 21 may have a configuration including a remote control signal receiving unit (not shown) and a remote controller (not shown) capable of remote operation. In this case, the remote controller emits an operation signal such as an infrared ray according to the operation content of the user, and the remote control signal receiving unit receives this and transmits it to the control unit 20 as control information.

  The temperature detection unit 22 includes one or more temperature sensors (such as a thermistor) (not shown), and the temperature of components that require cooling inside the housing of the projector 1, such as the temperature of the image projection unit 10 or the like. Measure. The temperature detection unit 22 outputs information on the measured temperature to the control unit 20.

  The abnormality storage unit 23 includes a nonvolatile memory, and stores the abnormality type as abnormality information when the control unit 20 detects an abnormality. In this embodiment, as the abnormality type, a high temperature abnormality that is an abnormality of the temperature detected by the temperature detection unit 22, a sensor abnormality that is an abnormality of the temperature sensor of the temperature detection unit 22, a light source abnormality that is an abnormality of the light source 11, and the like. And The abnormality type is not limited to these, and may be an abnormality type detected by other abnormality detection means. The control unit 20 writes the abnormality type to the abnormality storage unit 23. The stored abnormality type is read by the control unit 20.

  The mode setting unit 24 includes a non-volatile memory and stores setting information for the direct-on mode. Here, the direct on mode setting information is information indicating whether the mode of the projector 1 is set to the direct on mode or the normal mode. That is, it is information about whether or not the setting of the direct on mode is valid. The direct on mode is a first mode in which the light source 11 starts to be turned on when power is supplied from an external power source (not shown) such as an AC power source (hereinafter also referred to as “commercial power source”). This is a second mode in which the light source 11 is not turned on when power is supplied from an external power source. The direct on mode setting information is written and read by the control unit 20. In the present embodiment, the user can set the direct-on mode setting information via the control unit 20 by operating various keys provided in the operation receiving unit 21. For example, a “direct on mode setting” item is provided on the menu screen of the projector 1, and the user operates the menu key, cursor key, determination key, and the like provided in the operation reception unit 21, thereby obtaining the direct on mode setting information. It can be set.

  The light source control unit 25 controls supply and stop of power to the light source 11 based on an instruction from the control unit 20 and switches between turning on and off the light source 11. Further, when the light source control unit 25 detects an abnormality of the light source 11, the light source control unit 25 notifies the control unit 20 of information on the light source abnormality.

  The LED control unit 26 controls the supply and stop of power to the LED 27 based on an instruction from the control unit 20, and switches between turning on and off the LED 27.

  The LED 27 is one or more LEDs controlled by the LED control unit 26. In the present embodiment, the LED 27 corresponds to an abnormality notification unit that notifies the user of the abnormality type according to the lighting state (color, blinking pattern, etc.).

  The image information input unit 31 includes various image input terminals for connecting to an external image supply device (not shown) such as a personal computer, a video playback device, a memory card, a USB storage, or a digital camera via a cable. The image information (image signal) is input from the image supply device. The image information input unit 31 converts input image information into image data in a format that can be processed by the image processing unit 32, and outputs the image data to the image processing unit 32.

  The image processing unit 32 adjusts brightness, contrast, sharpness, hue, and various image quality adjustments such as gamma correction on the image data input from the image information input unit 31 based on an instruction from the control unit 20. Apply. The image processing unit 32 outputs the image data subjected to such adjustment and processing to the OSD processing unit 33.

  The OSD processing unit 33 performs processing for superimposing an OSD image such as a menu screen or a message screen on image data input from the image processing unit 32 based on an instruction from the control unit 20. The OSD processing unit 33 includes an OSD memory 33a and stores OSD image data representing graphics, fonts, and the like for forming an OSD image. In the present embodiment, the OSD memory 33 a stores message screen information for representing an abnormality type as an OSD message screen (hereinafter also referred to as “abnormal message screen”). The OSD memory 33a corresponds to a message screen storage unit.

  When the control unit 20 instructs to superimpose the OSD image, the OSD processing unit 33 reads the necessary OSD image data from the OSD memory 33a, and the image processing unit so that the OSD image is superimposed at a predetermined position of the input image. The OSD image data is combined with the image data input from 32. The image data combined with the OSD image data is output to the light valve driving unit 14. When there is no instruction to superimpose the OSD image from the control unit 20, the OSD processing unit 33 outputs the image data output from the image processing unit 32 to the light valve driving unit 14 as it is.

  When the light valve driving unit 14 drives the liquid crystal light valve 12 according to the image data input from the OSD processing unit 33, the liquid crystal light valve 12 modulates light incident from the light source 11 into image light according to the image data. The image light is projected from the projection lens 13.

With the configuration described above, the projector 1 can notify the abnormality type detected by the control unit 20 by the LED 27 or can be projected by the image projection unit 10 as an OSD message screen.
Hereinafter, the operation process of the projector 1 will be described.

  First, the state transition of the projector 1 will be described. FIG. 2 is a state transition diagram of the projector 1 according to the present embodiment. As shown in FIG. 2, the projector 1 can transition to a power-off state ST10, an abnormal standby state ST11, an abnormal message projection state ST12, a normal projection state ST13, and a normal standby state ST14.

  The power cut-off state ST10 is a state where power from a commercial power source such as AC100V is cut off. In the power cut-off state ST10, since no power is supplied from the commercial power supply, the projector 1 is not operating. When power is supplied from the commercial power source in the power shut-off state ST10, the projector 1 follows the direct-on mode setting information set in the mode setting unit 24 and the presence / absence of abnormality information stored in the abnormality storage unit 23. Then, the state transits to any of the abnormal standby state ST11, the normal projection state ST13, or the normal standby state ST14. Specifically, if the direct on mode is set and abnormality information is stored, the state transits to the abnormality standby state ST11. If the direct on mode is set and no abnormality information is stored, the process proceeds to the normal projection state ST13. Further, if the normal mode is set, the process transits to the normal standby state ST14. In the present embodiment, the power shutdown state ST10 corresponds to the first state.

  The abnormal standby state ST11 is a state in which the projector 1 does not turn on the light source 11, turns on the LED 27, and notifies the abnormality type by the lighting state. In the abnormal standby state ST11, when a power-on operation is performed with the power key provided in the operation reception unit 21, the projector 1 transitions to an abnormal message projection state ST12. Further, when the power from the commercial power supply is cut off, the projector 1 enters the power cut-off state ST10. In the present embodiment, the abnormal standby state ST11 corresponds to the second state. Further, the power-on operation by the power key in the abnormal standby state ST11 corresponds to the first operation.

  The abnormal message projection state ST12 is a state in which the projector 1 lights up the light source 11 and projects an abnormal message screen by OSD. In the abnormal message projection state ST12, when a power-off operation is performed with the power key provided in the operation reception unit 21, the projector 1 transits to the normal standby state ST14. Further, in the abnormal message projection state ST12, when 30 seconds have elapsed or any key operation (excluding the power key operation) provided in the operation reception unit 21 is performed, the projector 1 transits to the normal projection state ST13. Further, when the power from the commercial power supply is cut off, the projector 1 enters the power cut-off state ST10. In the present embodiment, the abnormal message projection state ST12 corresponds to the third state. Any key operation in the abnormal message projection state ST12 corresponds to the second operation.

  The normal projection state ST13 is a state in which the projector 1 lights up the light source 11 and projects an image based on the input image information (image signal). When an abnormality is detected in the normal projection state ST13, the projector 1 transitions to an abnormality standby state ST11. In the normal projection state ST13, when a power-off operation is performed using the power key provided in the operation reception unit 21, the projector 1 transitions to the normal standby state ST14. Further, when the power from the commercial power supply is cut off, the projector 1 enters the power cut-off state ST10. In the present embodiment, the normal projection state ST13 corresponds to the fourth state.

  The normal standby state ST14 is a state in which the projector 1 is on standby for a power-on operation without turning on the light source 11. When a power-on operation is performed with the power key in the normal standby state ST14, the projector 1 transitions to the normal projection state ST13. Further, when the power from the commercial power supply is cut off, the projector 1 enters the power cut-off state ST10.

Next, processing in each state of the projector 1 will be described.
FIG. 3 is a flowchart of processing when power is supplied from a commercial power source in the power-off state ST10 of the projector 1.

  When power is supplied from the commercial power source in the power shutdown state ST10, the control unit 20 reads the direct on mode setting information stored in the mode setting unit 24 and determines whether the direct on mode is set. Judgment is made (step S101). If the direct on mode is set (step S101: YES), the control unit 20 determines whether or not abnormality information is stored in the abnormality storage unit 23 (step S102).

  When the abnormality information is stored (step S102: YES), the control unit 20 instructs the LED control unit 26 to turn on the LED 27 according to the abnormality type (step S103). Then, the control unit 20 causes the projector 1 to transition to the abnormal standby state ST11 (step S104). Then, the process when power is supplied to the projector 1 from the commercial power supply is terminated.

  When abnormality information is not stored (step S102: NO), the control unit 20 instructs the light source control unit 25 to turn on the light source 11 (step S105). Then, the control unit 20 instructs the image processing unit 32 to start projecting the input image (step S106). Then, the control unit 20 causes the projector 1 to transition to the normal projection state ST13 (step S107). Then, the process when power is supplied to the projector 1 from the commercial power supply is terminated.

  When the direct on mode is not set, that is, when the normal mode is set (step S101: NO), the control unit 20 causes the projector 1 to transition to the normal standby state ST14 (step S108). Then, the process when power is supplied to the projector 1 from the commercial power supply is terminated.

Next, processing in the abnormal standby state ST11 of the projector 1 will be described.
FIG. 4 is a flowchart of processing in the abnormal standby state ST11 of the projector 1.

  In the abnormal standby state ST11, the control unit 20 determines whether or not a power-on operation has been performed using the power key provided in the operation receiving unit 21 (step S201). If the power-on operation has been performed (step S201: YES), the control unit 20 instructs the light source control unit 25 to turn on the light source 11 (step S202). Then, the control unit 20 instructs the OSD processing unit 33 to project an abnormal message screen corresponding to the abnormal type stored in the abnormal storage unit 23 (step S203).

Here, the abnormal message screen will be described. In this embodiment, an error message screen in the case of a high temperature abnormality will be described.
FIG. 5 is an explanatory diagram of an abnormality message screen in the case of a high temperature abnormality. As shown in Fig. 5, the error message screen M1 shows "Internal high temperature error", "Check that the air filter / exhaust port is not blocked or installed near the wall", "Air If the filter is clogged, clean or replace it. "And" If the problem persists after checking the above, ask your dealer for repair. " The

  Returning to FIG. 4, the control unit 20 starts the timer 20a (step S204). Then, the control unit 20 causes the projector 1 to transition to the abnormal message projection state ST12 (step S205). Then, the process in the abnormal standby state ST11 of the projector 1 is terminated.

  When the power on operation by the power key is not performed (step S201: NO), the process returns to step S201 and continues to wait for the power on operation. In the abnormal standby state ST11, when the power from the commercial power supply is cut off, the projector 1 enters the power cut-off state ST10.

Next, processing in the abnormal message projection state ST12 of the projector 1 will be described.
FIG. 6 is a flowchart of processing in the abnormal message projection state ST12 of the projector 1.

  In the abnormal message projection state ST12, the control unit 20 determines whether or not a power-off operation has been performed using the power key provided in the operation reception unit 21 (step S301). If the power-off operation has been performed (step S301: YES), the control unit 20 instructs the light source control unit 25 to turn off the light source 11 (step S302). Then, the control unit 20 causes the projector 1 to transition to the normal standby state ST14 (step S303). Then, the process in the abnormal message projection state ST12 of the projector 1 is terminated.

  When the power-off operation is not performed (step S301: NO), the control unit 20 determines whether any key operation provided in the operation reception unit 21 is performed (step S304). If any key operation has been performed (step S304: YES), the control unit 20 instructs the OSD processing unit 33 to end the projection of the abnormal message screen (step S305).

  The control unit 20 instructs the image processing unit 32 to start projecting the input image (step S306). Then, the control unit 20 causes the projector 1 to transition to the normal projection state ST13 (step S307). Then, the process in the abnormal message projection state ST12 of the projector 1 is terminated.

  If any key operation has not been performed (step S304: NO), the control unit 20 determines whether or not the value of the timer 20a has passed 30 seconds (step S308). If the value of the timer 20a has passed 30 seconds (step S308: YES), the process proceeds to step S305, and the process proceeds to the normal projection state ST13.

  If the value of the timer 20a has not passed 30 seconds (step S308: NO), the process proceeds to step S301. In the abnormal message projection state ST12, when the power from the commercial power supply is cut off, the projector 1 enters the power cut-off state ST10.

Next, processing in the normal projection state ST13 of the projector 1 will be described.
FIG. 7 is a flowchart of processing in the normal projection state ST13 of the projector 1.

  In the normal projection state ST13, the control unit 20 determines whether or not a power-off operation has been performed using the power key provided in the operation receiving unit 21 (step S401). If the power-off operation has been performed (step S401: YES), the control unit 20 instructs the light source control unit 25 to turn off the light source 11 (step S402). Then, the control unit 20 causes the projector 1 to transition to the normal standby state ST14 (step S403). Then, the processing in the normal projection state ST13 of the projector 1 ends.

  When the power-off operation is not performed (step S401: NO), the control unit 20 confirms the temperature information from the temperature detection unit 22 and the lighting state of the light source 11 from the light source control unit 25, and an abnormality is detected. It is determined whether or not (step S404). If an abnormality is detected (step S404: YES), the control unit 20 stores the abnormality type in the abnormality storage unit 23 (step S405).

  The control unit 20 instructs the light source control unit 25 to turn off the light source 11 (step S406). Then, the control unit 20 causes the projector 1 to transition to the abnormal standby state ST11 (step S407). Then, the processing in the normal projection state ST13 of the projector 1 ends.

  When no abnormality is detected (step S404: NO), the process proceeds to step S401. In the normal projection state ST13, when the power from the commercial power supply is cut off, the projector 1 enters the power cut-off state ST10.

Next, processing in the normal standby state ST14 of the projector 1 will be described.
FIG. 8 is a flowchart of processing in the normal standby state ST14 of the projector 1.

  In the normal standby state ST14, the control unit 20 determines whether or not a power-on operation has been performed using the power key provided in the operation receiving unit 21 (step S501). If the power-on operation has been performed (step S501: YES), the control unit 20 instructs the light source control unit 25 to turn on the light source 11 (step S502). Then, the control unit 20 instructs the image processing unit 32 to start projecting the input image (step S503). Then, the control unit 20 causes the projector 1 to transition to the normal projection state ST13 (step S504). Then, the process in the normal standby state ST14 of the projector 1 is terminated.

  If the power-on operation has not been performed (step S501: NO), the process proceeds to step S501 and continues to wait for the power-on operation. In the normal standby state ST14, when the power from the commercial power supply is cut off, the projector 1 enters the power cut-off state ST10.

  As described above, the projector 1 can transition between the power-off state ST10, the abnormal standby state ST11, the abnormal message projection state ST12, the normal projection state ST13, and the normal standby state ST14.

According to the embodiment described above, the following effects can be obtained.
(1) When power is supplied from a commercial power source in the power shut-off state ST10, the projector 1 turns on the light source 11 when the direct on mode is set and abnormality information is stored. Instead, the state transits to an abnormal standby state ST11 in which the abnormality information is notified by the LED 27. Thus, when the user cuts off the power from the commercial power supply without noticing that the projector 1 is abnormal and then supplies the power from the commercial power supply, the projector 1 turns on the light source 11. Therefore, it is possible to prevent the abnormality from recurring. Further, the user can recognize the abnormality by the LED 27 of the projector 1. Since the user can take measures against the abnormality, it is beneficial.

  (2) When the projector 1 receives a power-on operation in the abnormal standby state ST11, the projector 1 turns on the light source 11 and transitions to an abnormal message projection state ST12 in which the abnormal message screen M1 is projected. Thereby, the user can visually recognize the abnormality of the projector 1 on the projected abnormality message screen M1. In addition, since the countermeasure method for the abnormality is displayed on the abnormality message screen M1, the user can recognize the specific countermeasure method without looking at the instruction manual and the like, and the convenience is improved. .

  (3) In the abnormal message projection state ST12, the projector 1 terminates the projection of the abnormal message screen M1 when any key operation is performed or 30 seconds have elapsed, and the projector 1 responds to the input image information. A transition is made to the normal projection state ST13 in which image light is projected. As a result, the user can cancel the projection of the abnormal message screen M1 of the projector 1 and start viewing the input image.

  In addition, it is not limited to embodiment mentioned above, It is possible to implement by adding various change, improvement, etc. A modification will be described below.

  (Modification 1) In the above embodiment, the projector 1 turns on the LED 27 in the abnormal standby state ST11 and notifies the abnormality type according to the lighting state. However, the present invention is not limited to this. For example, a buzzer or a speaker (both not shown) may be provided, and the abnormality type may be notified by a buzzer sound or voice. Further, the projector 1 may be provided with a liquid crystal display (not shown) or the like, and the abnormality type may be notified by the liquid crystal display.

  (Modification 2) In the above embodiment, in the abnormal message projection state ST12, 30 seconds are counted as the predetermined time for projecting the abnormal message screen, but the time is not limited to 30 seconds.

  (Modification 3) In the above-described embodiment, the transmissive liquid crystal light valve 12 is used as the light modulator, but a reflective light modulator such as a reflective liquid crystal light valve can also be used. In addition, it is possible to use a micromirror array device that modulates light emitted from a light source by controlling the emission direction of incident light for each micromirror as a pixel.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 10 ... Image projection part, 11 ... Light source, 12 ... Liquid crystal light valve, 13 ... Projection lens, 14 ... Light valve drive part, 20 ... Control part, 20a ... Timer, 21 ... Operation reception part, 22 ... Temperature Detection unit, 23 ... abnormality storage unit, 24 ... mode setting unit, 25 ... light source control unit, 26 ... LED control unit, 27 ... LED, 31 ... image information input unit, 32 ... image processing unit, 33 ... OSD processing unit, 33a: OSD memory.

Claims (5)

A projector having an image projection unit that modulates and projects light emitted from a light source into image light according to image information,
Either the first mode in which the light source is turned on when power is supplied from an external power source or the second mode in which the light source is not turned on when power is supplied from the external power source can be set Mode setting section,
An abnormality detection unit for detecting an abnormality of the projector;
An abnormality storage unit that stores the abnormality detected by the abnormality detection unit as abnormality information;
An abnormality notification unit that notifies the abnormality information stored in the abnormality storage unit;
A control unit for controlling the operation of the projector;
With
In the first state in which the power from the external power source is cut off, the control unit is configured such that the first mode is set in the mode setting unit, and the abnormality information is stored in the abnormality storage unit. When the power from the external power supply is supplied, the projector is switched to the second state in which the abnormality notification unit is notified of the abnormality information without turning on the light source. The projector according to claim 1,
An operation accepting unit for accepting an operation on the projector;
A message screen storage unit for storing message screen information for representing the abnormality information as a message screen;
Further comprising
In the second state, when the control unit receives the first operation by the operation receiving unit, the control unit causes the image projection unit to turn on the light source and adds the message screen information stored in the message screen storage unit to the message screen information. A projector that switches to a third state in which corresponding image light is projected. The projector according to claim 1 or 2,
An image information input unit for inputting the image information;
In the third state, when the operation accepting unit accepts a second operation, the control unit causes the image projecting unit to finish projecting image light according to the message screen information, and the image information input unit The projector is switched to a fourth state in which image light corresponding to the image information input to the projector is projected. The projector according to claim 1 or 2,
An image information input unit for inputting the image information;
In the third state, when a predetermined time has elapsed, the control unit causes the image projection unit to finish projecting image light according to the message screen information, and the image information input to the image information input unit The projector is switched to a fourth state in which image light is projected according to the condition. A method of controlling a projector including an image projection unit that modulates and projects light emitted from a light source into image light according to image information,
Either a first mode in which lighting of the light source is started when power is supplied from an external power source or a second mode in which the light source is not turned on when power is supplied from the external power source is set. A mode setting step to perform,
An abnormality detection step for detecting an abnormality of the projector;
An abnormality storage step of storing the abnormality detected by the abnormality detection step as abnormality information;
An abnormality notification step of notifying the abnormality information stored in the abnormality storage step;
With
When the first mode is set by the mode setting step and the abnormality information is stored by the abnormality storage step,
In the first state in which power from the external power source is cut off, when power is supplied from the external power source, the abnormality information step notifies the abnormality information without turning on the light source. A control step for switching to a state;
A projector control method comprising:

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