JP5737541B2 - Projector and lighting method of light source of projector - Google Patents

Description

  The present invention relates to a projector and a lighting method of a light source of the projector.

  A projector using a discharge lamp (lamp) such as a high-pressure mercury lamp or a metal halide lamp as a light source is known. Among such projectors, there are projectors that use a plurality of light sources.

JP 2001-125198 A

  In a projector that selectively turns on a lamp from a plurality of lamps, if the lamp selected for lighting does not turn on for some reason, a relighting operation is normally performed on the same lamp. It is known that when the lamp temperature rises, it becomes difficult to turn on the lamp. Therefore, after confirming that the lamp did not turn on and before starting the re-lighting operation, ensure a margin and cool down period ( For example, it is usual to provide 15 seconds to 30 seconds). For this reason, there is a problem that the waiting time until the start of use becomes long for the user.

  The present invention has been made in view of the above problems, and provides a projector and a light source lighting method for the projector that can reduce the waiting time until the start of use when the lamp does not light up. For the purpose.

  The projector according to the present invention, in a projector having a plurality of light source units, a determination unit that determines a lighting state in a lighting start period of the light source unit, and when the determination unit determines that the lighting state is non-lighting, And a control unit that selects a light source unit different from the light source unit and performs lighting control.

  The lighting start period of the light source unit is, for example, a period from the start of driving the light source until the lighting state can be determined. Specifically, it corresponds to a case where the lamp has not been lit from the beginning, or a case where the lamp has been lit once but has disappeared until the lighting state can be determined.

  According to the present invention, when the lamp does not light up, the light source unit different from the light source unit that did not light up is selected and the lighting control is performed. Absent. Therefore, when the lamp does not light up, a projector capable of shortening the waiting time until the start of use can be realized.

  In the projector, the light source unit includes a lamp and a lighting driving unit that drives the lamp, and the control unit outputs a lighting command to any one of the lighting driving units, and the lamp is turned on. If not, a lighting driving unit different from the lighting driving unit may be selected and a lighting command may be output.

In the projector, the light source unit includes a lamp and a lighting driving unit that drives the lamp, and any one of the lighting driving units includes the control unit, and the control unit includes any one of the lighting driving units. If a lighting command is output to the lamp and the lamp does not light up, a lighting driving unit different from the lighting driving unit may be selected and the lighting command may be output.

  The lighting method of the light source of the projector according to the present invention is a lighting method of a light source of a projector having a plurality of light sources. In the lighting method of the light source, a lighting state in a lighting start period of the light source is determined. When it determines with lighting, the lighting control process which selects a light source different from the said light source and performs lighting control is performed, It is characterized by the above-mentioned.

1 is a diagram illustrating an example of the overall configuration of a projector according to an embodiment. The figure which shows an example of the circuit structure of the lighting drive part which concerns on this embodiment. 6 is a flowchart for explaining a lamp lighting method of the projector according to the embodiment. 4A and 4B are timing charts in the lamp lighting method according to this embodiment, and FIG. 4C is a timing chart in the conventional lamp lighting method. FIG. 10 is a diagram illustrating an example of the overall configuration of a projector according to a modification.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The embodiments described below do not unduly limit the contents of the present invention described in the claims. Also, not all of the configurations described below are essential constituent requirements of the present invention.

1. Overall Configuration of Projector FIG. 1 is a diagram illustrating an example of the overall configuration of a projector according to the present embodiment.

  The projector 500 according to the present embodiment includes a plurality of light source units. In the example shown in FIG. 1, it is configured to include two light source units 100-1 and 100-2.

  The light source unit 100-1 includes a lamp 90-1 as a light source and a lighting drive unit 10-1 that drives the lamp 90-1. Similarly, the light source unit 100-2 includes a lamp 90-2 as a light source and a lighting drive unit 10-2 that drives the lamp 90-2. In the present embodiment, an example in which a discharge lamp such as a high-pressure mercury lamp or a metal halide lamp is used as the lamps 90-1 and 90-2 will be described.

  Each of the lighting driving units 10-1 and 10-2 generates a high-voltage voltage pulse between the electrodes of the lamps 90-1 and 90-2 at the start-up to cause a dielectric breakdown, thereby forming a discharge path. -1 and 90-2 supply a driving current for maintaining a discharge with a given supply power.

  The projector 500 according to the present embodiment includes a control device 200. The control device 200 controls the operation from the start of lighting of the projector to the extinction thereof. The control device 200 is different from the light source unit when the determination unit 210 that determines the lighting state in the lighting start period of the light source units 100-1 and 100-2 and the determination unit 210 determines that the lighting state is non-lighting. It includes a control unit 220 that selects a light source unit and performs lighting control. The control device 200 and the lighting drive units 10-1 and 10-2 may communicate by serial communication using, for example, a UART (Universal Asynchronous Receiver Transmitter).

The control device 200 sends information related to the driving state of the lamp 90-1 such as the direct current Id1 that is the source of the driving current Ila1 of the lamp 90-1 from the lighting driving unit 10-1 to the communication signal 581.
Receive through. Similarly, the control device 200 receives information related to the driving state of the lamp 90-2 such as the direct current Id2 that is the source of the driving current Ila2 of the lamp 90-2 from the lighting driving unit 10-2 via the communication signal 582. .

  The determination unit 210 may determine that the lamp 90-1 has not been turned on when the direct current Id1 is a value equal to or less than a predetermined value in the lighting start period. Similarly, the determination unit 210 may determine that the lamp 90-2 has not been turned on when the direct current Id2 has a value equal to or less than a predetermined value during the lighting start period.

  Further, when the projector 500 receives a lighting operation from the user, the control device 200 transmits a lighting command as a communication signal 581 or 582 to the lighting driving unit 10-1 or 10-2 selected by the control unit 220. Also good. In addition, when the projector 500 receives a turn-off operation from the user, a turn-off command may be transmitted as the communication signal 581 or 582 to the lighting drive unit 10-1 or 10-2 corresponding to the lamp that is turned on.

A part or all of the control device 200 may be configured by a semiconductor integrated circuit. The control device 200 may be implemented by a dedicated circuit to perform the above-described various controls. For example, a CPU (Central Processing Unit) executes a control program stored in a storage unit (not shown) or the like. Accordingly, the computer can function as a determination unit corresponding to the determination unit 210 and a control unit corresponding to the control unit 220 to perform various controls of these processes.

  The projector 500 according to the present embodiment may include an image signal conversion unit 510, an image processing device 570, a DC power supply device 80, a mirror group 550, and liquid crystal panels 560R, 560G, and 560B.

  The image signal converter 510 converts an externally input image signal 502 (such as a luminance-color difference signal or an analog RGB signal) into a digital RGB signal having a predetermined word length to generate image signals 512R, 512G, and 512B. This is supplied to the image processing device 570.

  The image processing device 570 performs image processing on the three image signals 512R, 512G, and 512B, and outputs drive signals 572R, 572G, and 572B for driving the liquid crystal panels 560R, 560G, and 560B, respectively.

  The DC power supply device 80 converts an AC voltage supplied from an external AC power supply 600 into a constant DC voltage, and an image signal conversion unit on the secondary side of a transformer (not shown, but included in the DC power supply device 80). 510, the image processing device 570, and the lighting drive units 10-1 and 0-2 on the primary side of the transformer are supplied with a DC voltage.

  The light beams emitted from the lamps 90-1 and 90-2 are separated into R, G, and B color lights through two dichroic mirrors included in the mirror group 550, respectively, and reflected by the other mirrors, respectively, and the liquid crystal panels 560R and 560G, respectively. 560B.

  The liquid crystal panels 560R, 560G, and 560B are light modulation units that form images based on the drive signals 572R, 572G, and 572B, respectively, and modulate the amount of color light transmitted through each liquid crystal panel by the images. Each color light modulated by the light modulation means is again synthesized by the dichroic prism and projected onto the screen 700.

2. Configuration of Lighting Driver FIG. 2 is a diagram illustrating an example of a circuit configuration of the lighting driver according to the present embodiment. In the following description, the configuration of the lighting drive unit 10-1 will be described, but the same applies to the configuration of the lighting drive unit 10-2.

  The lighting drive unit 10-1 includes a power control circuit 20. The power control circuit 20 generates supply power to the lamp 90-1. In the present embodiment, the power control circuit 20 includes a down chopper circuit that receives the DC power supply device 80 as an input, steps down the input voltage, and outputs a DC current Id1.

  The power control circuit 20 can be configured to include a switch element 21, a diode 22, a coil 23, and a capacitor 24. The switch element 21 can be composed of, for example, a transistor. In the present embodiment, one end of the switch element 21 is connected to the positive voltage side of the DC power supply device 80, and the other end is connected to the cathode terminal of the diode 22 and one end of the coil 23. One end of a capacitor 24 is connected to the other end of the coil 23, and the other end of the capacitor 24 is connected to the anode terminal of the diode 22 and the negative voltage side of the DC power supply device 80. A current control signal is input from the lighting control unit 40 to the control terminal of the switch element 21 to control ON / OFF of the switch element 21. For example, a PWM (Pulse Width Modulation) control signal may be used as the current control signal.

  Here, when the switch element 21 is turned ON, a current flows through the coil 23 and energy is stored in the coil 23. Thereafter, when the switch element 21 is turned OFF, the energy stored in the coil 23 is released through a path passing through the capacitor 24 and the diode 22. As a result, a direct current Id1 corresponding to the proportion of time during which the switch element 21 is turned on is generated.

  The lighting drive unit 10-1 includes an AC conversion circuit 30. The AC conversion circuit 30 receives the DC current Id output from the power control circuit 20, and generates and outputs a drive current Ila1 having an arbitrary duty ratio and frequency by inverting the polarity at a given timing. In the present embodiment, the AC conversion circuit 30 is configured by an inverter bridge circuit (full bridge circuit).

  The AC conversion circuit 30 includes, for example, first to fourth switch elements 31 to 34 such as transistors, and the first and second switch elements 31 and 32 connected in series and the first switch elements 31 and 32 connected in series. The third and fourth switch elements 33 and 34 are connected in parallel to each other. An AC conversion control signal is input from the lighting control unit 40 to the control terminals of the first to fourth switch elements 31 to 34, and ON / OFF of the first to fourth switch elements 31 to 34 is controlled. .

  The AC conversion circuit 30 repeats ON / OFF of the first and fourth switch elements 31 and 34 and the second and third switch elements 32 and 33 alternately, thereby outputting the direct current output from the power control circuit 20. The polarity of the current Id1 is alternately reversed, and the controlled duty ratio and frequency are controlled from the common connection point of the first and second switch elements 31 and 32 and the common connection point of the third and fourth switch elements 33 and 34. A drive current Ila1 having the above is generated and output.

  That is, when the first and fourth switch elements 31 and 34 are ON, the second and third switch elements 32 and 33 are turned OFF, and when the first and fourth switch elements 31 and 34 are OFF, the second and third switch elements 31 and 34 are OFF. The third switch elements 32 and 33 are controlled to be turned on. Therefore, when the first and fourth switch elements 31 and 34 are ON, the drive current Ila1 that flows from the one end of the capacitor 24 in the order of the first switch element 31, the lamp 90-1, and the fourth switch element 34 is generated. . When the second and third switch elements 32 and 33 are turned on, a drive current Ila1 that flows from the one end of the capacitor 24 in the order of the third switch element 33, the lamp 90-1, and the second switch element 32 is generated. .

  The lighting drive unit 10-1 includes a lighting control unit 40. The lighting control unit 40 controls the power control circuit 20 and the AC conversion circuit 30 to control lighting and extinguishing of the lamp 90-1. For example, the lighting control unit 40 controls the power supply to the lamp 90-1 by controlling the power control circuit 20 to control the current value of the direct current Id1. Further, for example, the lighting control unit 40 controls the duty ratio, the frequency, and the like of the drive current Ila1 by controlling the polarity conversion timing of the drive current Ila1 by controlling the AC conversion circuit 30.

  Further, the lighting control unit 40 transmits and receives a communication signal 581 to and from the control device 200 of the projector 500. For example, the lighting control unit 40 transmits information related to the driving state of the lamp 90-1 to the control device 200, such as a direct current Id1 that is a source of the driving current Ila1 of the lamp 90-1. Further, for example, the lighting control unit 40 receives a lighting command for instructing lighting of the lamp 90-1 from the control device 200. The lighting control unit 40 starts lighting control of the lamp 90-1 based on the lighting command received from the control device 200.

  The configuration of the lighting control unit 40 is not particularly limited, but in the present embodiment, the lighting control unit 40 includes a system controller 41, a power control circuit controller 42, and an AC conversion circuit controller 43. . Note that a part or all of the lighting control unit 40 may be configured by a semiconductor integrated circuit.

  The system controller 41 controls the power control circuit 20 and the AC conversion circuit 30 by controlling the power control circuit controller 42 and the AC conversion circuit controller 43. The system controller 41 includes a power control circuit controller 42 and an AC conversion circuit controller based on a drive voltage Vd detected by a voltage detection unit provided in the lighting drive unit 10-1 to be described later and a DC current Id1 detected by the current detection unit 60. 43 may be controlled.

  In the present embodiment, the system controller 41 includes a built-in storage unit 44. The built-in storage unit 44 may be provided independently of the system controller 41.

  The system controller 41 may control the power control circuit 20 and the AC conversion circuit 30 based on information stored in the built-in storage unit 44. The built-in storage unit 44 stores information on driving parameters such as the current value of the DC current Id1, the holding time that the driving current Ila1 continues with the same polarity, the current value of the driving current Ila1, the duty ratio, the frequency, and the waveform. May be.

  The power control circuit controller 42 controls the power control circuit 20 by outputting a current control signal to the power control circuit 20 based on the control signal from the system controller 41.

  The AC conversion circuit controller 43 controls the AC conversion circuit 30 by outputting an AC conversion control signal to the AC conversion circuit 30 based on the control signal from the system controller 41.

Note that the lighting control unit 40 can be realized by a dedicated circuit and perform the above-described control and various types of control described later. For example, a control (CPU) stored in the internal storage unit 44 or the like is provided. It is also possible to function as a computer by executing the program and to perform various controls of these processes.

  The lighting drive unit 10-1 includes a current detection unit 60. The current detector 60 detects the direct current Id1 and outputs drive current information. In the present embodiment, the current detection unit 60 includes a resistor 63. The current detection unit 60 detects the direct current Id1 output from the power control circuit 20 based on the voltage generated in the resistor 63 connected in series with the lamp 90-1.

  The lighting drive unit 10-1 may include a voltage detection unit. The voltage detector detects the drive voltage Vd. In the present embodiment, the voltage detection unit includes resistors 61 and 62. The voltage detection unit detects the drive voltage Vd based on the voltage divided by the resistors 61 and 62 connected in series with each other in parallel with the lamp 90-1.

  The lighting driving unit 10-1 may include an igniter circuit 70. The igniter circuit 70 operates only at the start of lighting of the lamp 90-1, and at the start of lighting of the lamp 90-1, a high voltage (usually required for dielectric breakdown between the electrodes of the lamp 90-1 to form a discharge path. A higher voltage pulse than the control operation is supplied between the electrodes of the lamp 90-1. In the present embodiment, the igniter circuit 70 is connected in parallel with the lamp 90-1.

3. Lamp lighting method In the lamp (light source) lighting method of the projector according to the present embodiment, a determination process for determining a lighting state in a lamp lighting start period, and a lamp (light source) that has not been turned on in the determination process When the determination is made, a lighting control process for selecting a lamp (light source) different from the lamp (light source) and performing lighting control is performed.

  FIG. 3 is a flowchart for explaining a lamp lighting method of the projector 500 according to the present embodiment.

  First, the projector 500 receives a lighting operation from the user (step S100). After receiving the lighting operation from the user, the control device 200 selects a lamp to be lit and performs lighting control (step S102). For example, an ID may be given to each lamp in advance, and the lamps that have not been used last time may be selected in the order of ID. In the following description, the case where the lamp 90-1 is selected in step S102 will be described as an example.

  When the lamp 90-1 is selected in step S102, the control unit 220 of the control device 200 outputs a lighting command via the communication signal 581 to the lighting driving unit 10-1 corresponding to the lamp 90-1. The lighting driving unit 10-1 that has received the lighting command starts driving the lamp 90-1. For example, the driving of the lamp 90-1 is started by supplying a high voltage pulse for a predetermined period between the electrodes of the lamp in the igniter circuit 70.

  After step S102, the lighting drive unit detects the lamp drive current (step S104). In this description, since the lamp 90-1 is selected in step S102, the direct current Id1 is detected by the current detection unit 60 of the lighting drive unit 10-1. Information on the detected direct current Id1 is transmitted to the control device 200 via the communication signal 581.

  After step S104, the determination unit 210 of the control device 200 performs a determination process for determining the lighting state during the lamp lighting start period (step S106). The lamp lighting start period may be, for example, a period from when the igniter circuit 70 starts supplying a high voltage pulse between the lamp electrodes for a predetermined period until the lamp driving current can be detected stably thereafter. .

The determination unit 210 of the control device 200 determines that the lamp has not been lit (the lighting state is not lit) when the lamp driving current is equal to or less than a predetermined value. Specifically, the case where the lamp 90-1 has not been lit from the beginning, or the case where the lamp 90-1 has been lit once but has been extinguished until the lighting state can be determined, or the like is applicable. In this description, since the lamp 90-1 is selected in step S102, it is determined that the lamp 90-1 has not been turned on (the lighting state is not turned on) when the DC current Id1 is equal to or less than a predetermined value. To do.

  If it is determined in step S106 that the lamp has not been lit (the lighting state is not lit) (YES in step S106), the control unit 220 of the control device 200 is turned on differently from the lighting drive unit. A lighting control process for selecting a drive unit and outputting a lighting command is performed (step S108). In this description, since the lamp 90-1 is selected in step S102, the control unit 220 of the control device 200 selects the lighting drive unit 10-2 corresponding to the lamp 90-2, and transmits the communication signal 582 via the communication signal 582. Output lighting command.

  After step S110, the lighting drive unit detects the lamp drive current (step S104). In this description, since the lamp 90-2 is selected in step S108, the direct current Id2 is detected by the current detection unit 60 of the lighting drive unit 10-2. Information regarding the detected direct current Id2 is transmitted to the control device 200 via the communication signal 582.

  After step S104, the determination unit 210 of the control device 200 performs a determination process for determining the lighting state during the lamp lighting start period (step S106). In this description, since the lamp 90-2 is selected in step S108, it is determined that the lamp 90-1 has not been lit (the lighting state is not lit) when the direct current Id2 is equal to or less than a predetermined value. To do.

  If it is determined in step S106 that the lamp has not been lit (the lighting state is not lit) (YES in step S106), the control unit 220 of the control device 200 is turned on differently from the lighting drive unit. A lighting control process for selecting a drive unit and outputting a lighting command is performed (step S108). In this description, since the lamp 90-2 is selected in step S108, the control unit 220 of the control device 200 selects the lighting drive unit 10-1 corresponding to the lamp 90-1, and transmits the communication signal 581 via the communication signal 581. Output lighting command.

  In the present embodiment, an example of a projector having two lamps 90-1 and 90-2 has been described. However, in the case of a projector having three or more lamps, in step S108 described above, the lamp A third lamp different from 90-1 and 90-2 may be selected.

  Steps S108, S104, and S106 are repeated until it is determined in step S106 that the lamp has been turned on. If it is determined in step S106 that the lamp has been turned on (NO in step S106), the flow shown in FIG. 3 ends.

  4A and 4B are timing charts in the lamp lighting method according to this embodiment, and FIG. 4C is a timing chart in the conventional lamp lighting method. 4A and 4B show an example in which the lamp 90-1 is first selected. FIG. 4C shows an example of lighting the lamp 90-1.

  In the example shown in FIG. 4A, when the projector 500 receives a lighting operation from the user (step S100), the igniter circuit 70 is high between the electrodes of the lamp 90-1 in the ignition period from time t0 to time t1. A voltage pulse is supplied (step S102). The length of the ignition period is, for example, about 3 seconds.

Thereafter, the current detection unit 60 detects the direct current Id1 at time t2 (step S104),
The determination unit 210 determines the lighting state of the lamp 90-1 at time t3 (step S106).

  When the determination unit 210 determines that the lamp 90-1 has not been turned on (the lighting state is not lit), the igniter circuit 70 is connected to the electrode of the lamp 90-2 in the ignition period from time t4 to time t5. In the meantime, a high voltage pulse is supplied (step S108), and a cooling period in which the lamp 90-1 is cooled from time t4 to time t9 is set. The length of the cooling period is, for example, about 30 seconds.

  After the end of the ignition period of the lamp 90-2, the current detection unit 60 detects the direct current Id2 at time t6 (step S104), and the determination unit 210 determines the lighting state of the lamp 90-2 at time t7 (step S106). ).

  When the determination unit 210 determines that the lamp 90-2 has been turned on, the lamp 90-2 is continuously turned on.

  FIG. 4B illustrates an example in which the determination unit 210 determines that the lamp 90-2 has not been turned on (the lighting state is not turned on) at time t7. The operation before time t7 is similar to the operation described with reference to FIG.

  When the determination unit 210 determines that the lamp 90-2 has not been turned on at time t7 (the lighting state is not turned on), the time from the time t10 to the time t11 after the end of the cooling period of the lamp 90-1. In the ignition period, the igniter circuit 70 supplies a high voltage pulse between the electrodes of the lamp 90-1 (step S108), and at the same time, the lamp 90-2 is cooled from time t8 to time t13. Thereafter, similarly, lighting control is alternately repeated until lighting of either the lamp 90-1 or the lamp 90-2 is successful.

  The conventional lamp lighting method shown in FIG. 4C is the operation on the lamp 90-1 side in the lamp lighting method according to this embodiment shown in FIG. 4B (the upper stage side operation in FIG. 4B). ).

  In the lamp lighting method according to the present embodiment, when one of the lamps does not come on, the other lamp is lit without waiting for the cooling period. For example, in the conventional lamp lighting method shown in FIG. 4C, the second ignition period starts at time t10, but the lamp lighting according to this embodiment shown in FIGS. 4A and 4B is performed. In the method, the second ignition period starts at time t4. Therefore, when the lamp does not light up, a projector capable of shortening the waiting time until the start of use can be realized.

  Also, the lighting success probability of the lamp in the first ignition period tends to be higher than the lighting success probability of the same lamp in the second ignition period. Therefore, in FIG. 4B and FIG. 4C, the lighting success probability in the ignition period of the lamp 90-2 starting from the time t4 is higher than the lighting success probability in the ignition period of the lamp 90-1 starting from the time t10. Is considered higher. Therefore, it is possible to turn on the lamp with higher probability at an early stage, and thus a projector capable of shortening the waiting time until the start of use can be realized.

[Modification]
In the above-described embodiment, the control unit 220 is provided in the control device 200, but the control unit 220 may be provided in any one of the lighting drive units 10-1 and 10-2.

  FIG. 5 is a diagram illustrating an example of the overall configuration of a projector according to a modification. In addition, the same code | symbol is attached | subjected to the structure similar to the structure shown in FIG. 1, and detailed description is abbreviate | omitted.

In the projector 501 illustrated in FIG. 5, the lighting drive unit 10-1 includes the determination unit 210 and the control unit 220. The lighting driving unit 10-1 and the lighting driving unit 10-2 may communicate by serial communication using, for example, a UART (Universal Asynchronous Receiver Transmitter).

  Information regarding the direct current Id2 detected by the current detection unit 60 of the lighting drive unit 10-2 is transmitted to the control device 200 via the communication signal 583.

  When the light source unit 100-1 is selected and the lighting control is performed, the control unit 220 outputs a lighting command to the lighting control unit 40 of the lighting driving unit 10-1. In addition, when the light source unit 100-2 is selected and the lighting control is performed, the control unit 220 outputs a lighting command to the lighting control unit 40 of the lighting driving unit 10-2 via the communication signal 583.

  The lamp lighting method in the projector 501 shown in FIG. 5 is the same as the lamp lighting method in the projector 500 described with reference to FIG. 3 and FIGS. 4A to 4C, and has the same effect.

  In each of the above embodiments, a projector using three liquid crystal panels has been described as an example. However, the present invention is not limited to this, and one, two, four or more liquid crystal panels are used. It can also be applied to projectors.

In each of the above embodiments, the projector provided with the transmission type light modulation means has been described as an example. Is possible. Here, “transmission type” means that an electro-optic modulation device as a light modulation means such as a transmission type liquid crystal panel transmits light, and “reflection type” means This means that an electro-optic modulator as a light modulator such as a reflective liquid crystal panel or a micromirror type light modulator is a type that reflects light. As the micromirror light modulator, for example, DMD (digital micromirror device; trademark of Texas Instruments) can be used. Even when the present invention is applied to a projector including a reflection type light modulation unit, the same effect as that of a projector including a transmission type light modulation unit can be obtained.

  In addition, this invention is not limited to this embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention.

  The present invention includes configurations that are substantially the same as the configurations described in the embodiments (for example, configurations that have the same functions, methods, and results, or configurations that have the same objects and effects). In addition, the invention includes a configuration in which a non-essential part of the configuration described in the embodiment is replaced. In addition, the present invention includes a configuration that exhibits the same operational effects as the configuration described in the embodiment or a configuration that can achieve the same object. Further, the invention includes a configuration in which a known technique is added to the configuration described in the embodiment.

  For example, in the above description, an example of a projector mainly including two lamps has been described. However, a projector including three or more lamps may be used. Moreover, the illumination apparatus and projector which select and light two or more lamps out of three or more lamps may be used.

10-1, 10-2 lighting drive unit, 80 DC power supply, 90-1, 90-2 lamp,
100-1, 100-2 Light source unit, 200 control unit, 210 determination unit, 220 control unit, 500, 501 projector, 502 image signal, 510 image signal conversion unit, 512R image signal (R), 512G image signal (G) 512B Image signal (B), 550
Mirror group, 560R liquid crystal panel (R), 560G liquid crystal panel (G), 560B liquid crystal panel (B), 570 image processing device, 572R liquid crystal panel (R) drive signal, 572G liquid crystal panel (G) drive signal, 572B liquid crystal panel (B) Drive signal, 581, 582, 583 Communication signal, 600 AC power supply, 700 screen

Claims (4)

A first light source unit and a second light source unit;
A control unit that selects one of the first light source unit and the second light source unit and performs lighting start control of the selected light source unit;
A determination unit that determines a lighting state during a lighting start period of the first light source unit and the second light source unit;
Including
The controller is
A first lighting start control process for selecting one of the first light source unit and the second light source unit and performing the lighting start control;
When the determination unit determines that the lighting state of the one light source unit is not lit after the first lighting start control process, the one light source unit enters a cooling period and the first lighting start control process A second lighting start control process for selecting the other light source unit not selected in step and performing the lighting start control;
Do the projector. The projector according to claim 1.
When the determination unit determines that the lighting state of the other light source unit is not lit after the second lighting start control process, the other light source unit becomes the cooling period and the other light source unit becomes the cooling period. The light source unit performs a third lighting start control process for selecting the one light source unit selected in the first lighting start control process and performing the lighting start control during the cooling period. The projector according to claim 1 or 2,
The said control part is a projector which preferentially selects the light source part which was not used last time among the said 1st light source part and the said 2nd light source part in a said 1st lighting start control process. A lighting method for a light source of a projector having a first light source unit and a second light source unit,
A first lighting start control process of selecting one of the first light source unit and the second light source unit and performing lighting start control of the one light source unit;
A first determination process for determining a lighting state during a lighting start period of the one light source unit after the first lighting start control process;
When it is determined that the lighting state is non-lighting in the first determination process, the one light source unit is in a cooling period, and the other light source unit not selected in the first lighting start control process is selected, A second lighting start control process for performing the lighting start control of the other light source unit;
To turn on the light source of the projector.

Images