JP2023082460A - Light source device, projection type display device, program, and method for controlling light source device - Google Patents

Abstract

To provide a light source device that facilitates control regardless of the number of projection units.SOLUTION: A light source device has: a light source unit that has a plurality of light sources emitting rays of light with different wavelength regions; switching means that temporally switches light paths of the rays of light emitted from the plurality of light sources; detection means that detects the number of a plurality of projection units projecting rays of light; and a control unit that controls output of the plurality of light sources and controls the switching time of the switching means. The control unit changes at least the switching time based on a result of detection performed by the detection means.SELECTED DRAWING: Figure 2

Description

The present invention relates to a light source device, a projection display device, a program, and a light source device control method.

2. Description of the Related Art In recent years, proposals have been made for projection-type display devices and systems that realize high-luminance and large-sized projection screens by connecting the light source section and the projection section of the projector with an optical fiber.

For example, there is a projection display device and system in which light from a plurality of light sources provided in a light source device is gathered into one projection unit to increase the brightness of the projection screen. Further, there is a projection display device and system in which light from a light source provided in a light source device is divided into a plurality of beams and projected by a plurality of projection units to enlarge the projection screen. Also, in each projection display device and system, the projection section is separated from the light source by a fiber. Therefore, rather than installing a projector with a general light source included in the housing, the configuration is such that only the projection unit is installed.

For example, in the light source device described in Patent Document 1, light is transmitted from one light source to a plurality of projection units via optical fibers, and the projection screens from the plurality of projection units are arranged to achieve a large screen and high resolution. there is

U.S. Pat. No. 7,014,318

However, in the conventional technology disclosed in the above-mentioned patent document, the light of three colors of light in the red wavelength range, light in the green wavelength range, and light in the blue wavelength range is divided into three and guided to the projection section. Therefore, when a display device such as a DMD (Digital Mirror Device) is used, it is necessary to time-divide light of three colors with a color wheel, which reduces light utilization efficiency. Moreover, the projection part becomes large by providing a color wheel in the projection part. Furthermore, when the number of projection units increases or decreases, it is necessary to set the distribution ratio and output ratio of the three colors of light to appropriate values according to the number of projection units, which causes problems such as complicating the control of the light source device. rice field.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a light source device that can be easily controlled regardless of the number of projection units.

In order to achieve the above object, a light source device as one aspect of the present invention includes a light source unit having a plurality of light sources that emit light in different wavelength ranges, and temporally dividing the optical paths of the light emitted from the plurality of light sources. a switching means for switching, a detection means for detecting the number of a plurality of projection units that project light, and a control unit for controlling outputs of the plurality of light sources and a switching time of the switching means; is characterized by changing at least the switching time based on the detection result of the detection means.

According to the present invention, for example, it is possible to provide a light source device that facilitates control regardless of the number of projection units.

1 is a schematic diagram of an overall configuration of a projection display device in an example; FIG. FIG. 10 is a detailed view of the inside of the synthesizing means when there are four projection units in the embodiment; FIG. 3 is a diagram showing temporal changes of time-division light in FIG. 2 ; 4 is a flow chart showing an example of a method for controlling the output of the light source or the switching time of the switching means in the embodiment. FIG. 10 is a detailed view of the inside of synthesizing means when there are three projection units in the embodiment; FIG. 6 is a diagram showing temporal changes of time-division light in FIG. 5 ;

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below using examples and drawings with reference to the accompanying drawings. In each figure, the same members or elements are denoted by the same reference numerals, and overlapping descriptions are omitted or simplified.

<Example>
Hereinafter, the configuration of the projection display apparatus 10 and the method of controlling the output of the light source 50 or the switching time of the switching means 71 will be described with reference to FIGS. 1 to 6. FIG.

First, the overall configuration of the projection display device 10 will be described below with reference to FIG. FIG. 1 is a schematic diagram showing an outline of a projection display device 10. As shown in FIG. A projection display device 10 of this embodiment includes a light source device 20 and a light transmission means 30 .

The light source device 20 includes a plurality of light sources (light source units) 50 , a light source control unit 60 , a synthesizing unit 70 , a switching control unit 80 , a detection unit 90 and a main control unit 100 .

The light source 50 has a light source optical system that emits light in different wavelength ranges, and is composed of, for example, a laser diode (LD). Light in different wavelength regions in this embodiment includes light in the red (R) wavelength region (light in the first wavelength region), light in the green (G) wavelength region (light in the second wavelength region), and blue (light in the second wavelength region). B) It becomes light in the wavelength range (light in the third wavelength range). The light source 50 of this embodiment includes a light source 501 that emits light in the red wavelength range, a light source 502 that emits light in the green wavelength range, and a light source 503 that emits light in the blue wavelength range. Furthermore, in this embodiment, the light source 502 that emits light in the green wavelength band includes a light source 5021 and a light source 5022 .

The light source control unit 60 includes, for example, a CPU, a memory, etc., and is composed of at least one computer, and controls the output of the light source 50 . Also, the light source control section 60 is connected to a main control section 100 (to be described later) through a line, and controls the output of the light source 50 based on a control signal from the main control section 100 when controlling the output of the light source 50 .

The synthesizing means 70 includes a plurality of switching means 71, a plurality of reflecting mirrors 72, and a plurality of dichroic mirrors 73, which will be described later. The combined light is generated by time-sharing light in the red wavelength range, light in the green wavelength range, and light in the blue wavelength range using a plurality of switching means 71 to generate cyclically switching combined light. The configuration of the synthesizing means will be described later. The switching control unit 80 includes, for example, a CPU, a memory, and the like, and is composed of at least one computer, controls the switching time of the switching means 71, and controls the light in the red wavelength range, the light in the green wavelength range, and the light in the blue wavelength range. controls the temporal proportion of Also, the switching control section 80 is connected to a main control section 100 to be described later through a line, and when controlling the switching time of the switching means 71 , controls this based on the control signal from the main control section 100 .

The detection means 90 detects the number of projection units 40, which will be described later. The detection unit 90 is configured as a sensor that detects the number of the projection units 40 by detecting a current value, an electric signal, or the like when the projection units 40 are activated, for example.

The main control unit 100 includes, for example, a CPU, a memory, and the like, is composed of at least one computer, and is connected to each component of the projection display device 10 via a line. The main control unit 100 controls the light source control unit 60 and the switching control unit 80 by transmitting control signals through lines, and through these control units, according to the programs stored in the memory, the projection display apparatus 10 Overall control of the operation and adjustment of each component of Further, the main control unit 100 may be configured integrally with other portions of the projection display device 10 (within a common housing), or may be configured separately from the other portions of the projection display device 10 (separately). ), or may be installed in a different location from the projection display device 10 and controlled remotely.

The light transmission means 30 connects the synthesizing means 70 and the projection section 40 and transmits the light from the light source 50 to the projection section 40 . The light transmission means 30 is composed of, for example, an optical fiber or the like. Further, the number of light transmission means 30 corresponds to the number of projection units 40. In this embodiment, first light transmission means 301, second light transmission means 302, and third light transmission means 302 are provided. Means 303 , including fourth light transmission means 304 .

The projection section 40 includes a projection lens, an optical modulation element (transmissive liquid crystal panel), and a control section (not shown). The projection lens is a lens that enlarges and projects an image synthesized by the light synthesis optical system onto a projection plane (screen), and the light modulation element modulates incident light to generate an image. The photosynthesis optical system synthesizes images of light in the red wavelength region, light in the green wavelength region, and light in the blue wavelength region generated by the light modulation element. The control unit (not shown) includes, for example, a CPU, a memory, and the like, is composed of at least one computer, controls each part of the projection unit 4, and is connected to the main control unit 100 through a line. Here, in this embodiment, as described above, there are three projection units 4 . The effect of the embodiment can be obtained.

In this embodiment, the case where the projection section 40 is composed of four projection sections 401, 402, 403, and 404 will be described. . In this embodiment, the synthesizing means 70 and the first projection section 401 are connected by the first light transmission means 301 . Also, the synthesis means 70 and the second projection section 402 are connected by the second light transmission means 302 . The synthesizing means 70 and the third projection section 403 are connected by the third light transmission means 303 . The synthesizing means 70 and the fourth projection section 404 are connected by the fourth light transmission means 304 .

Next, with reference to FIGS. 2 and 3, a method of controlling the light sources 50 and the synthesizing means 70 according to the number of projection units 40 will be described. FIG. 2 is a detailed view of the interior of the synthesizing means 70 in the projection display device 10. As shown in FIG. FIG. 3 is a diagram showing temporal changes of combined light in which light in the red wavelength range, light in the green wavelength range, and light in the blue wavelength range are cyclically switched in FIG. As described above, this embodiment shows the case where there are four projection units 40 . Each switching means 71 is indicated by a zigzag pattern in FIG. 2, each reflecting mirror is indicated by a vertical striped pattern, and the dichroic mirror 73 is indicated by a hatched pattern.

The switching unit 71 is configured to be capable of temporally switching the optical path of light emitted from the light source 50 having a plurality of light sources. In this embodiment, the switching means 71 is composed of an optical element that reflects light by a plurality of micromirrors, such as MEMS (Micro Electro Mechanical System) mirrors that can deflect light in two-dimensional directions. be. A plurality of switching units 71 are arranged inside the synthesizing unit 70 . The switching means for reflecting the light emitted from the light source 501 includes switching means 7111, 7112, and 7113, which function as first switching means in this embodiment. The switching means for reflecting the light emitted from the light source 502 includes switching means 7121 and 7122, which function as second switching means in this embodiment. Switching means for reflecting the light emitted from the light source 503 includes switching means 7131, 7132, and 7133, which function as third switching means in this embodiment.

The reflecting mirror 72 is an optical element that reflects the emitted light, and a plurality of reflecting mirrors 72 are arranged inside the synthesizing means 70 in this embodiment. The dichroic mirror 73 is an optical element that transmits light in a desired wavelength range and reflects light in other wavelength ranges. . The dichroic mirror 73 also includes a dichroic mirror 732 (horizontal stripe pattern) that reflects the light emitted from the light source 502 . The dichroic mirror 73 further includes a dichroic mirror 731 (hatched) that reflects the light reflected by the light source 503 and the dichroic mirror 732 . Dichroic mirror 732 further includes dichroic mirrors 7321 , 7322 , 7323 , and 7324 . Moreover, the dichroic mirror 731 further includes dichroic mirrors 7311 , 7312 , 7313 , and 7314 .

Here, in this embodiment, the light emitted from the light source 501 is first time-divided into two optical paths by the switching means 7111 . Next, one of the two time-divided optical paths is reflected by the reflecting mirror 72 and is further time-divided into two optical paths by the switching means 7112 . The other optical path is also reflected by the reflecting mirror 72 and time-divided into two optical paths by the switching means 7113, whereby the light emitted from the light source 501 is time-divided into a total of four optical paths.

Light emitted from the light source 5021 is first time-divided into two optical paths by the switching means 7121 . is reflected by The light emitted from the light source 5022 is further time-divided into two optical paths by the switching means 7122 , and one of the two optical paths is reflected by the reflecting mirror 72 . The light emitted from the light source 502 is time-divided into a total of four optical paths because the other optical path is also reflected by the reflecting mirror 72 .

Light emitted from the light source 503 is first time-divided into two optical paths by the switching means 7131 . Next, one of the two time-divided optical paths is reflected by the reflecting mirror 72 , time-divided into two optical paths by the switching means 7132 , and the other optical path is also reflected by the reflecting mirror 72 . Then, the light emitted from the light source 501 is time-divided into a total of four optical paths by time-dividing into two optical paths by the switching means 7133 . Thereby, the light emitted from each light source is time-divided into four optical paths.

Then, the light emitted from the light source 503 and split into four optical paths is reflected by each of the reflecting mirrors 72, changes its direction by 90 degrees by another reflecting mirror 72, and passes through the dichroic mirror 732 (horizontal stripe pattern), It is reflected by the dichroic mirror 731 (diagonal pattern). On the other hand, the light emitted from the light source 502 and time-divided into four optical paths is reflected by the dichroic mirror 732 and further reflected by the dichroic mirror 731 . Furthermore, the light emitted from the light source 501 and time-divided into four optical paths is reflected by the reflecting mirrors 72 and then transmitted through the dichroic mirror 731 . As a result, light emitted from the light sources 501, 502, and 503 and time-divided into four optical paths becomes synthetic light L1, synthetic light L2, synthetic light L3, and synthetic light L4 that are cyclically switched.

Here, light in the red wavelength region (light in the first wavelength region) from the light source 501, light in the green wavelength region (light in the second wavelength region) from the light source 502, and light in the blue wavelength region from the light source 503 (light in the third wavelength band) is emitted. Then, the combined light becomes combined light in which the light in the red wavelength range, the light in the green wavelength range, and the light in the blue wavelength range are cyclically switched. In this embodiment, the light source 502 that emits the light in the green wavelength range is divided into two to form the synthesizing means 70 that generates the four synthetic lights L1, L2, L3, and L4. However, not limited to this, the light source 501 that emits light in the red wavelength range and the light source 503 that emits light in the blue wavelength range are divided into two, and four cyclically switched combined lights L1, L2, L3, and L4 are generated. may be generated.

In FIG. 3 described above, the horizontal axis represents time, the vertical axis represents the output of the light source, and R represents light in the red wavelength range emitted from the light source 501 . G1 represents light in the green wavelength range emitted from the light source 5021 . G2 represents light in the green wavelength range emitted from the light source 5022 . B represents light in the blue wavelength range emitted from the light source 503 . As shown in FIG. 3, the cyclically switched combined lights L1, L2, L3, and L4 are combined lights in which three colors of RGB are switched in different circulations.

A method of controlling the output of the light source 50 or the switching time of the switching means 71 in this embodiment will be described below with reference to FIG. FIG. 4 is a flow chart of the switching time control process of the switching means 71 . Each operation (process) at this time is controlled by executing a computer program recorded in the memory by the main control unit 100 in this embodiment.

After starting the projection display device 10, first, in step S101, the main control unit 100 controls the detection means 90 to detect the number of each projection unit 40 (detection step). Next, in step S102, the main control unit 100 determines the output of the light source 50 based on the number of the detected projection units 40, and uses this as the output information of the light source 50, for example, in the memory of the main control unit 100. Store in a recording medium. Further, the switching time in each switching means 71 is calculated based on the number of detected projection units 40, and is stored as switching time information in a recording medium such as the memory of the main control unit 100, for example. do. At this time, the memory of the main control unit 100 also functions as a storage unit that stores the output information of the light source 50 and the switching time information of the switching means 71 determined according to the number of the plurality of projection units 40 . In addition, the main control unit 100 also detects the output information of the light source 50, the light emission method, and the switching time information of the switching means 71 according to the predetermined projection mode such as brightness priority, contrast priority, and color priority of each projection unit 40. These are stored based on the number of projection units 40 .

The main control unit 100 controls the output of the light source 50 or changes the output information to be transmitted to the light source control unit 60 by changing the output information to be transmitted to the light source control unit 60 according to the projection mode described above. This makes it possible to control the switching times of the switching means 71 respectively. The projection mode can be selected by the user operating a switching button provided in the projection display device 10 or by operating a menu screen or the like displayed on a display unit (not shown) provided in the projection display device 10 . . Here, each switching means 71 includes switching means 7111 , 7112 , 7113 , 7121 , 7122 , 7131 , 7132 , and 7133 .

Next, in step S<b>103 , the main control unit 100 transmits the output information of the light source 50 to the light source control unit 60 , and transmits the switching time information of the switching means 71 to the switching control unit 80 . Next, in step S104, based on the information transmitted from the main control unit 100, the light source control unit 60 and the switching control unit 80 control one or both of the output of the light source 50 and the switching time of the switching means 71. (control process). This allows the light source controller 60 to adjust the output of the light source 50 . The switching control unit 80 can perform control (switching step) for temporally switching the optical path of the light emitted to each switching unit 71 based on the switching time information. The cyclically switched combined light generated by the light sources 501 , 502 , and 503 of the light source device 20 is guided to the plurality of projection units 40 via the plurality of light transmission means 30 . After being guided to a plurality of projection units 40, the light is modulated by a display device having an image display device such as a single plate type DMD (Digital Mirror Device) (not shown). The light in the red wavelength range, the light in the green wavelength range, and the light in the blue wavelength range are projected from the projection unit 40 while being cyclically switched.

Further, the main controller 100 can change the ON/OFF pattern (on/off pattern) of each light source 50 based on the detection result of the detection means 90 . In this case, by transmitting ON/OFF control signals for each light source 50 to the light source control unit 60, lighting of each light source 50 can be controlled. For example, if the number of projection units 40 is changed from four to three while the configuration of the synthesizing means 70 of the present embodiment remains unchanged, the number of light sources 50 that were originally guided to the projection units 40 that do not project among the projection units 40 Control is performed such that the light amount is turned off only at the light emission timing. Further, for example, when the number of projection units 40 is changed from four to three, the switching time of the switching means 71 is controlled so that light is guided to only three optical paths. A case where the number of projection units 40 is changed from four to three will be described below with reference to FIG.

FIG. 5 is a diagram of the interior of the synthesizing means 70 in the projection display device 10 when the projection units 40 are three. In this case, the number of the projection units 40 is four as described above, but the detection means 90 may detect the number of the projection units 40 as three. The number of projection units may be three from the beginning, and the detection means 90 may detect three projection units 40 .

As illustrated in FIG. 5, the light emitted from the light source 501 is first time-divided into two optical paths by the switching means 7111 . One optical path is reflected by the reflecting mirror 72 and is further time-divided into two optical paths by the switching means 7112, and the other optical path is reflected by the reflecting mirror 72 and is switched in only one direction by the switching means 7113. FIG. Thereby, the light emitted from the light source 501 is time-divided into a total of three optical paths.

Light emitted from the light source 5021 is time-divided into two optical paths by the switching means 7121 and the reflecting mirror 72 . On the other hand, the light emitted from the light source 5022 is discontinuously lit. The lights emitted from the light sources 501, 5021, and 503 are continuously lit. Continuous lighting and discontinuous lighting are controlled by the light source controller 60 . As described above, in this embodiment, the light source control unit 60 can control lighting of the light sources so that each light source is lit continuously or discontinuously based on the detection result of the detection means 90 . The switching time (switching operation) of the switching means 7122 is synchronized with the light emission interval (light emission timing) of the light source 5022, and the light from the light source 502 can be calculated by switching the optical path only to one of the reflecting mirrors 72. It is time-divided into three optical paths. In the above description, the switching time of the switching means 7122 is controlled so as to be synchronized with the light emission interval of the light source 5022. However, according to the detection result of the detecting means 90, other light sources and other switching means are controlled similarly. I do. By synchronizing the switching time of the light emission of the light source 5022 and the switching time of the switching means 7122, the light is not led to an unnecessary optical path.

Light emitted from the light source 503 is first time-divided into two optical paths by the switching means 7131 . One optical path is reflected by the reflecting mirror 72 and is further time-divided into two optical paths by the switching means 7112 , and the other optical path is reflected by the reflecting mirror 72 and is switched in only one direction by the switching means 7133 . Thereby, the light emitted from the light source 501 is time-divided into a total of three optical paths.

The light emitted from the light source 503 and split into three optical paths is reflected by each of the reflecting mirrors 72 , changes its direction by 90 degrees by another reflecting mirror 72 , passes through the dichroic mirror 732 , and passes through the dichroic mirror 731 . reflect. On the other hand, the light emitted from the light source 502 and time-divided into three optical paths is reflected by the dichroic mirror 732 and then by the dichroic mirror 731 . Furthermore, the light emitted from the light source 501 and time-divided into three optical paths is reflected by the reflecting mirror 72 and then transmitted through the dichroic mirror 731 . As a result, light emitted from the light sources 501, 502, and 503 and time-divided into three optical paths becomes synthetic light L1, synthetic light L2, and synthetic light L3 that are cyclically switched.

FIG. 6 is a diagram showing temporal changes of combined light in which light in the red wavelength range, light in the green wavelength range, and light in the blue wavelength range are cyclically switched in FIG. FIG. 6A is a diagram showing a state equivalent to the state in which the light source output of L4 in FIG. 3 is turned off for all three colors. FIG. 6B is a diagram showing a state in which the control method of the switching means 71 in FIG. 3 is changed to change the order in which the three colors of light are cyclically switched. FIG. 6C is a diagram showing a state in which the outputs of the lights G1 and G2 in the green wavelength region and the control method of the switching means 71 are changed to change the order in which the three color lights are cyclically switched.

In this manner, the light source control section 60 and the switching control section 80 may change either one of the output of the light source and the switching time of the switching means, or may change both of them.

3 and 6, the number of projection units 40 is detected by the detecting means 90 as described with reference to FIG. Then, the main control unit 100 transmits information on the predetermined output of the light source 50 and switching time of the switching unit 71 based on the result of the detection unit 90 to the light source control unit 60 and the switching control unit 80 .

Here, as described above, the switching means 71 is an optical element that reflects light by a plurality of micromirrors such as MEMS mirrors. The life of the switching means 71 is defined as the hinge portion that supports the micromirror not moving normally, and the more the ON/OFF cycle of the hinge portion is biased towards one side, the more likely it is to deteriorate. Therefore, it is desirable that the switching means 71 be continuously driven in order to prevent deterioration of the switching means 7113 . For example, taking the switching means 7113 described above as an example, the switching means 7113 and the switching means 7111 are driven so as to synchronize with each other. Furthermore, the switching means 7113 may be driven at the same driving timing as the driving timing of the switching means 7111, and the driving of the switching means 7113 is not the same timing as the driving of the switching means 7111, but is continuous at any driving timing. It should be driven.

As described above, with the configuration shown in this embodiment, the light that has been time-divided in advance by the switching means 71 is guided to the projection section 40 by the light transmission means 30, so that the light utilization efficiency is improved. In addition, since the light that has been time-divided in advance is guided to the projection section 40, the projection section can be made compact because an optical element such as a color wheel is not required in the projection section.

Furthermore, even if the number of the projection units 40 increases or decreases, by controlling the output of the light source 50 and the switching time of the switching means 71 according to the number of the projection units 40, light in the red wavelength range and light in the green wavelength range can be Image quality can be stabilized by adjusting the balance of light in the blue wavelength range. Accordingly, it is possible to provide the light source device 20 and the projection display device 10 that are easy to control regardless of the number of projection units. Furthermore, it is possible to simplify the light source separation system that guides the light from the light source device 20 to the plurality of projection units 40 .

The above-described embodiments described above are merely representative examples, and various modifications and changes can be made to the above-described embodiments when implementing the present invention.

Further, a computer program that implements the functions of the above-described embodiments may be supplied to the projection display apparatus 10 or the like via a network or various storage media for some or all of the controls in the above-described embodiments. Then, the computer (or CPU, MPU, etc.) in the projection display device 10 or the like may read and execute the program. In that case, the program and the storage medium storing the program constitute the present invention.

10 Projection type display device 20 Light source device 30 Light transmission means 40 Projection unit 50 Light source 60 Light source control unit 70 Synthesis unit 71 Switching unit 72 Reflecting mirror 73 Dichroic mirror 80 Switching control unit 90 Detection unit 100 Main control unit L Synthesis that switches cyclically light

Claims (15)

a light source unit having a plurality of light sources that emit light in different wavelength ranges;
switching means for temporally switching optical paths of the light emitted from the plurality of light sources;
detection means for detecting the number of a plurality of projection units that project the light;
a control unit that controls the outputs of the plurality of light sources and controls the switching time of the switching means;
The light source device, wherein the control section changes at least the switching time based on the detection result of the detection means. 2. The light source device according to claim 1, further comprising a storage section for storing information on said switching time of said switching means according to the number of said plurality of projection sections. 3. The light source device according to claim 2, wherein the storage section stores information on the switching time of the switching means corresponding to a predetermined projection mode of the projection section. 4. The light source device according to claim 3, wherein the projection mode includes a mode according to any one of brightness priority, contrast priority, and color priority. The light source device according to any one of claims 1 to 4, wherein the control section changes the on/off pattern of the plurality of light sources according to the detection result of the detection means. 6. The control unit controls the plurality of light sources so that the plurality of light sources are lit continuously or discontinuously based on the detection results of the detection means. The light source device according to any one of . the plurality of light sources emit at least light in a first wavelength range, light in a second wavelength range, and light in a third wavelength range;
The switching means includes first switching means for switching the optical path of the light in the first wavelength range, second switching means for switching the optical path of the light in the second wavelength range, and light in the third wavelength range. 7. The light source device according to any one of claims 1 to 6, further comprising third switching means for switching the optical path. 8. The light source according to claim 7, further comprising synthesizing means for synthesizing said first, second and third lights so that said first, second and third lights are cyclically switched by said first, second and third switching means. Device. 9. The light of the first, second, and third wavelength regions synthesized by the synthesizing means is modulated by an image display device while being cyclically switched, and projected from the projection unit. A light source device as described. The switching operation of the first, second and third switching means and the light emission timing of the plurality of light sources emitting light in the first, second and third wavelength ranges are synchronized. Item 9. The light source device according to any one of items 7 to 9. 11. The light source device according to claim 1, wherein said switching means is driven continuously. The light source device according to any one of claims 1 to 11, wherein the lights in the different wavelength ranges are light in a red wavelength range, light in a green wavelength range, and light in a blue wavelength range. A program for controlling each part of the light source device according to any one of claims 1 to 12 by a computer. A light source device according to any one of claims 1 to 12;
light transmission means for transmitting light from the light source unit having a plurality of light sources that emit light in different wavelength ranges;
the plurality of projection units projecting the light transmitted from the light transmission means;
A projection display device comprising: a switching step of temporally switching the optical path of the light emitted from a light source unit having a plurality of light sources that emit light in different wavelength ranges;
a detection step of detecting the number of a plurality of projection units that project the light;
a control step of controlling outputs of the plurality of light sources and controlling a switching time in the switching step;
A control method for a light source device, wherein in the control step, at least the switching time is changed based on a detection result of the detection step.

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