Processing apparatus, image projection device, and processing method

Abstract

To perform good white balance adjustment when performing stack projection using a plurality of projectors.SOLUTION: A processing apparatus 160 controls output of a plurality of light sources that emit color light different from each other and that are included in a plurality of image projection devices 1, 2 in performing stack projection using the plurality of image projection devices. The processing apparatus acquires information on output characteristics for each of the light sources in the plurality of image projection devices, and on the basis of the information on the output characteristics, controls output of each of the light sources so that the ratio between the composite brightnesses of the rays of color light in the stack projection becomes a ratio according to a target white balance.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a processing device that performs white balance adjustment when performing multi-projection (stack projection). [Background technology]

[0002] Stack projection is one of the methods of multi-projection that projects one image using multiple image projection devices (projectors). Some projectors have solid-state light sources such as laser diodes (LDs) and LEDs of multiple colors. Although solid-state light sources can emit strong light, they can deteriorate due to heat, so cooling control is performed to keep the temperature of the solid-state light source constant using cooling means such as fans. In order to adjust the white balance in a projector that uses solid-state light sources of multiple colors, it is necessary to change the output of one of these solid-state light sources.

[0003] Patent Document 1 discloses a method for adjusting white balance by adjusting the output by changing the temperature of solid-state light sources of multiple colors, utilizing the output characteristics of the solid-state light sources relative to their temperature. Specifically, the magnitude of the cooling capacity of a cooling unit provided in each solid-state light source is set according to the optical and thermal characteristics of each solid-state light source. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2008-158390 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the method disclosed in Patent Document 1 produces a solid-state light source with a very large temperature change for white balance adjustment. As a result, the life of the solid-state light source may be adversely affected or it may be destroyed by COD (catastrophic optical damage). In addition, if the temperature change of the solid-state light source is large, there is a risk that white balance adjustment cannot be performed by cooling the solid-state light source alone.

[0006] The present invention provides a processing device and the like that is capable of performing favorable white balance adjustment when stack projection is performed using a plurality of projectors. [Means for solving the problem]

[0007] A processing device as one aspect of the present invention controls the output of a plurality of light sources emitting different color lights included in each of a plurality of image projection devices when stack projection is performed by the plurality of image projection devices. The processing device is characterized by having an acquisition means for acquiring information on the output characteristics of each light source in the plurality of image projection devices, and a control means for controlling the output of each light source based on the information on the output characteristics so that the ratio of the composite brightness of each color light in stack projection becomes a ratio corresponding to a target white balance. Note that an image processing device equipped with the above processing device also constitutes another aspect of the present invention.

[0008] A processing method according to another aspect of the present invention is a method for controlling the output of a plurality of light sources emitting different color lights included in each of a plurality of image projection devices when stack projection is performed by the plurality of image projection devices. The processing method includes a step of acquiring information on the output characteristics of each light source in the plurality of image projection devices, and a step of controlling the output of each light source based on the information on the output characteristics so that the ratio of the composite brightness of each color light in stack projection corresponds to a target white balance. Note that a program for causing a computer to execute processing according to the above processing method also constitutes another aspect of the present invention. Effect of the Invention

[0009] According to the present invention, when stack projection is performed using a plurality of image projection devices, good white balance adjustment can be performed. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a block diagram showing a configuration of two projectors in the first and second embodiments. [Diagram 2] 4 is a flowchart showing a white balance adjustment process in the first embodiment. [Diagram 3] FIG. 1 is a graph showing IL characteristics of an LD. [Figure 4] A table explaining how to perform white balance calculations on a single projector. [Diagram 5] FIG. 4 is a table for explaining a method of performing white balance calculation using two projectors in the first embodiment. [Figure 6] 10 is a flowchart showing a white balance adjustment process in the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, embodiments of the present invention will be described with reference to the drawings. EXAMPLES

[0012] 1 shows the configuration of a projector (image projection device) 1 and a projector (another image projection device) 2 according to a first embodiment. The projectors 1 and 2 can communicate with each other via cables (wired communication) or wireless communication connected to communication units 400 and 800 provided in the projectors 1 and 2. As one type of multi-projection, the projectors 1 and 2 perform stack projection in which the images projected by the projectors 1 and 2 are overlapped with each other with high accuracy to display one bright projection image.

[0013] The configurations of projectors 1 and 2 are basically the same, so here we will explain the configuration of projector 1. Projector 1 has an R (red) panel 140r, a G (green) panel 140g, and a B (blue) panel 140b as light modulation elements, and projects an image onto a projection surface according to the display state of each panel. Each panel is a hold-type liquid crystal panel that displays by accumulating electric charge, or a digital micromirror device that displays by driving (ON) / not driving (OFF) each of a plurality of mirrors, or the like. The R panel 140r, the G panel 140g, and the B panel 140b are provided with temperature adjustment units 210r, 210g, and 210b, respectively, as temperature adjustment means.

[0014] The operation unit 300 is operated by a user who turns on / off the power of the projector 1 and selects various projection modes, and outputs a signal according to the operation.

[0015] The control unit 160 receives a signal from the operation unit 300 and controls the image processing unit 110, the LD light source driving unit 220, the temperature adjustment units 210r, 210g, and 210b, the communication unit 400, and the like.

[0016] The video input unit 100 receives an input image signal (video data) output from a video output device such as a personal computer (PC) or a DVD player. The video processing unit 110 performs processes such as noise removal, edge enhancement, scaling, and keystone correction on the video data from the video input unit 100, and outputs the processed video data to the panel drive signal generation unit 120. The panel drive signal generation unit 120 receives the video data from the video processing unit 110, converts it into a signal corresponding to the specifications of each panel, and outputs it to the panel drive unit 130. The panel drive unit 130 drives each panel according to the signal input from the panel drive signal generation unit 120. As a result, an image corresponding to the video data is displayed on each panel. The R-LD light source 200r, G-LD light source 200g, and B-LD light source 200b, which are solid-state light sources that emit different color lights, are driven by the R-LD drive unit 220r, G-LD drive unit 220g, and B-LD drive unit 220b in the LD light source drive unit 220, respectively. The control unit 160 can control the output of each LD light source via each LD driving unit or each temperature adjusting unit.

[0017] Illumination light (red light) output from the R-LD light source 200r is irradiated onto the R panel 140r via an illumination optical system (not shown). The R panel 140r generates image light by modulating the incident illumination light in accordance with a display image. The image light is enlarged and projected onto the projection surface via the projection optical system 150. Illumination light (green light) output from the G-LD light source 200g is also irradiated onto the G panel 140g via the illumination optical system, and the image light generated by the modulation by the G panel 140g is enlarged and projected onto the projection surface via the projection optical system 150. Illumination light (blue light) output from the B-LD light source 200b is also irradiated onto the B panel 140b via the illumination optical system, and the image light generated by the modulation by the B panel 140b is enlarged and projected onto the projection surface via the projection optical system 150. One full-color projection image is displayed by the red, green, and blue image lights.

[0018] Additionally, the projector 1 is provided with a storage unit 170 and a calculation unit 180, each of which is connected to the control unit 160. The storage unit 170 stores information on the output characteristics of the R-LD, G-LD, and B-LD light sources 200r, 200g, and 200b. The output characteristics will be described later.

[0019] The calculation unit 180 reads out information on the output characteristics of each LD light source from the storage unit 170. Then, based on the information on the output characteristics of each LD light source, a brightness adjustment parameter (specific parameter) is calculated so that the ratio of the composite brightness (total output value of the LD light sources of the same color in projectors 1 and 2) of each color light in stack projection becomes a ratio according to the target white balance. The brightness adjustment parameter in this embodiment is a temperature adjustment parameter indicating the temperature of the LD light source. The control unit 160 controls the output (brightness) of each LD light source by driving the temperature adjustment unit (210r, 210g, 210b) for each LD light source based on the temperature adjustment parameter. The same components in projector 2 as those in projector 1 are assigned symbols that are 400 larger than the symbols in projector 1.

[0020] The flowchart in Fig. 2 shows a white balance adjustment process (processing method) executed in stack projection by the control unit (processing device) 160 of the projector 1 as the master projector in the first embodiment. The control unit 160 as a computer such as a CPU executes this process according to a computer program. The control unit 160 and the calculation unit 180 constitute an acquisition means and a control means. In the following description, S means a step.

[0021] In S1, the control unit 160 accepts a user's operation on the operation unit 300 and checks the set projection mode. The projection modes include image modes (standard mode, presentation mode, movie mode, sRGB mode, etc.), various video modes, and even energy saving mode, etc. These projection modes each have different target white balances in the projected image.

[0022] In S2, the control unit 160 determines whether or not readjustment of the white balance is necessary depending on the projection mode confirmed in S1. If readjustment of the white balance is necessary, the process proceeds to S3, and if not, the process proceeds to S8.

[0023] In S3, the control unit 160 reads out from the storage unit 170 data indicating the relationship between the drive current value, the light source output value, and the temperature, which are the output characteristics of each of the LD light sources 200r, 200g, and 200b.

[0024] In S4, the control unit 160 communicates with the projector 2, which is a sub-projector, through the communication units 400 and 800, and obtains information regarding the output characteristics of each of the LD light sources 600r, 600g, and 600b of the projector 2.

[0025] 3(a)-(c) show the output characteristics of the R-LD, G-LD and B-LD light sources 200r, 200g, 200b (600r, 600g, 600b) for each light source temperature (25, 35 and 45°C), that is, the light source output value for each drive current value for each light source temperature. The horizontal axis is the drive current value (Current) and the vertical axis is the light source output value (POWER). For each LD light source, the higher the drive current value, the higher the light source output value, and conversely, the lower the drive current value, the lower the light source output value. Also, for each LD light source, even with the same drive current value, the lower the light source temperature, the higher the light source output value, and conversely, the higher the light source temperature, the lower the light source output value. And, the amount of change in the light source output value due to the light source temperature (temperature sensitivity) is different for each LD light source. That is, the difference between the light source output value at 25°C, the light source output value at 35°C and the light source output value at 45°C is different for each LD light source.

[0026] The information on the output characteristics acquired in S4 may be information that directly indicates the light source output value for the drive current value for each light source temperature shown in Figures 3(a) to (c), or may be information that can be converted into these.

[0027] In S5, the control unit 160 causes the calculation unit 180 to calculate temperature adjustment parameters for the LD light sources 200r, 200g, and 200b and the LD light sources 600r, 600g, and 600b of the projectors 1 and 2. At this time, the calculation is performed using information on the output characteristics of each LD light source of the projectors 1 and 2 and the ratio of the composite brightness of each color light for obtaining a target white balance. A specific method of calculating the temperature adjustment parameters will be described later.

[0028] In S6, the control unit 160 drives the temperature adjustment units 210r, 210g, and 210b based on the temperature adjustment parameters calculated for each color LD light source of the projector 1 in S5, and adjusts (controls) the brightness of the LD light sources 200r, 200g, and 200b. The control unit 160 also transmits the temperature adjustment parameters calculated for each color LD light source of the projector 2 to the projector 2 through the communication units 400 and 800. This causes the control unit 560 of the projector 2 to drive the temperature adjustment units 610r, 610g, and 610b based on the temperature adjustment parameters to adjust the brightness of the LD light sources 600r, 600g, and 600b.

[0029] In S7, the control unit 160 determines whether or not the projection mode has been changed by a user operation on the operation unit 300, and if the projection mode has been changed, the process returns to S2. If the projection mode has not been changed, the process returns to S6.

[0030] On the other hand, in S8, which is reached when readjustment of the white balance is not required in S2, the control unit 160 drives the temperature adjustment units 210r, 210g, and 210b so that the temperatures of the LD light sources 200r, 200g, and 200b are constant. The control unit 160 also instructs the control unit 560 of the projector 2 through the communication units 400 and 800 to drive the temperature adjustment units 610r, 610g, and 610b so that the temperatures of the LD light sources 600r, 600g, and 600b are constant.

[0031] In S9, the control unit 160 determines whether or not the projection mode has been changed by a user operation on the operation unit 300, similarly to S7, and if the projection mode has been changed, the process returns to S2. If the projection mode has not been changed, the process returns to S8.

[0032] 4(a) to (c), a comparative example will be described in which the temperature control of each color LD light source is performed when a single projector 1 performs white balance adjustment independently. Fig. 4(a) shows the light source output values ​​(Pred, Pgreen, Pblue) for each light source temperature (LD temperature) of the R-LD, G-LD, and B-LD light sources as numerical values ​​based on the output characteristics shown in Figs. 3(a) to (c).

[0033] The Peltier voltage is a voltage applied to the Peltier elements provided in the temperature adjustment units 210r, 210g, and 210b. The Peltier element is a plate-shaped semiconductor thermoelectric element that produces the Peltier effect. When a voltage is applied in a certain direction and a current is passed through it, heat is absorbed (cooled) on one side of the element, which is the cooling surface, and heat is generated on the other side, which is the heating surface. Also, when the direction of the voltage application is changed to change the direction of the current flow, the cooling surface and the heating surface are switched. By using the Peltier element, it becomes possible to perform highly accurate temperature control of the LD light source, that is, output control.

[0034] In Fig. 4(a), when the Peltier voltage is E [V], each LD light source is at 45°C, and the light source output values ​​at that time are Pred = 23 [W], Pgreen = 14 [W], and Pblue = 26 [W]. These light source output values ​​indicate the power consumption value when a certain current is passed through the LD light source, and represent the energy that replaces the brightness of the LD light source. In other words, the higher the power consumption value, the greater the brightness of the LD light source, and conversely, the lower the power consumption value, the less bright the LD light source.

[0035] Figure 4(b) shows the target light source output value (hereafter referred to as target output value) of each color LD light source to obtain the target white balance in single projection. As shown in the figure, the target output value is Pred:Pgreen:Pblue=27(W):12(W):24(W), so the ratio of the target output value of each color LD light source, that is, the target value of the ratio of brightness for each color light (hereafter referred to as target ratio) is 9:4:8.

[0036] Figure 4(c) shows the relationship between the light source output value of each color LD light source after white balance adjustment and the Peltier voltage and LD temperature at that time. Each color LD light source has the characteristic that it becomes brighter as the light source temperature is lower and becomes darker as the light source temperature is higher. Therefore, in order to adjust the white balance without reducing the brightness of each color LD light source, it is necessary to lower the LD temperature of each color LD light source.

[0037] Specifically, as shown by the arrows in Fig. 4(c), by lowering the LD temperature of each color LD light source, Pred:Pgreen:Pblue = 30 (W):14.5 (W):28 (W) is achieved. As a result, the ratio of the light source output values ​​of each color LD light source can be set to the target output value ratio of 9:4:8 without lowering the light source output value of each color LD light source.

[0038] At this time, for the R-LD light source, it is necessary to cool the LD temperature by 20°C from 45°C to 25°C by changing the Peltier voltage from E[V] to A[V]. For the G-LD light source, it is necessary to cool the LD temperature by 5°C from 45°C to 40°C by changing the Peltier voltage from E[V] to D[V]. For the B-LD light source, it is necessary to cool the LD temperature by 20°C from 45°C to 25°C by changing the Peltier voltage from E[V] to A[V]. However, it is unrealistic to cool the R-LD light source and the B-LD light source by 20°C when the LD light source is generating heat, and such a large temperature adjustment amount may affect the life of the LD light source or lead to COD destruction.

[0039] In contrast, in this embodiment, white balance adjustment is performed in total for two projectors 1 and 2. Temperature control of each color LD light source when performing white balance adjustment with two projectors will be described with reference to Figs. 5(a) to (c). The calculation unit 180 calculates temperature adjustment parameters for each color LD light source (temperature adjustment unit) in S5 of Fig. 2 so as to achieve the LD temperature described here.

[0040] Fig. 5(a) shows the light source output values ​​(Pred, Pgreen, Pblue) for each LD temperature of the R-LD, G-LD, and B-LD light sources of projectors 1 and 2 based on the output characteristics shown in Fig. 3(a) to (c). The values ​​for projector 1 are the same as those shown in Fig. 4(a).

[0041] In projector 2, when the Peltier voltage is E [V], each LD light source is at 45°C, but the light source output values ​​are Pred = 26 [W], Pgreen = 12.5 [W], and Pblue = 24.5 [W], which are different from projector 1.

[0042] FIG. 5(b) shows the target output values ​​(target ratio 9:4:8) of the LD light sources for each color to obtain the target white balance, just like FIG. 4(b).

[0043] Figure 5(c) shows the relationship between the light source output value of each color LD light source of projectors 1 and 2 after white balance adjustment and the Peltier voltage and LD temperature at that time. The brightness of each color light in stack projection by projectors 1 and 2 is twice that of single projection by one projector. For this reason, the light source output value of each color LD light source shown in Figure 5(b) is doubled. In other words, the target output value of each color LD light source to obtain the target white balance in stack projection is Pred = 54 [W], Pgreen = 24 [W], Pblue = 48 [W] as the total brightness (composite brightness) of projectors 1 and 2. The target ratio, which is the ratio of the target output value of each color LD light source at this time, is also 9:4:8, the same as in single projection.

[0044] Next, while minimizing the temperature adjustment amount of each LD light source, search for the light source output value of each color LD light source of projectors 1 and 2 that will obtain the target white balance in stack projection. For example, lower the LD temperature of each color LD light source as shown by the arrow in Figure 5(c).

[0045] That is, in projector 1, the Peltier voltage for the R-LD light source is changed from E [V] to B [V], and the LD temperature is cooled by 15°C from 45 [°C] to 30 [°C]. The Peltier voltage for the G-LD light source is left at E [V], and the LD temperature is also left unchanged at 45 [°C]. The Peltier voltage for the B-LD light source is changed from E [V] to C [V], and the LD temperature is cooled by 10°C from 45 [°C] to 35 [°C].

[0046] On the other hand, in projector 2, the Peltier voltage for the R-LD light source is changed from E [V] to C [V], and the LD temperature is cooled by 10°C from 45 [°C] to 35 [°C]. The Peltier voltage for the G-LD light source is left at E [V], and the LD temperature is also left unchanged at 45 [°C]. The Peltier voltage for the B-LD light source is changed from E [V] to C [V], and the LD temperature is cooled by 10°C from 45 [°C] to 35 [°C].

[0047] As a result, the light source output values ​​of the LD light sources of each color in projector 1 are Pred:Pgreen:Pblue=28.5(W):14(W):27(W). Also, the light source output values ​​of the LD light sources of each color in projector 2 are Pred:Pgreen:Pblue=30(W):12.5(W):25.5(W). The light source output values ​​of the LD light sources of each color are not reduced (increased or maintained) in either projector 1 or 2. At this time, the ratio of the light source output values ​​of the LD light sources of each color in projector 1 is Pr:Pg:Pb=9.5:4.7:9, and the ratio in projector 2 is 10:4.2:8.5, which differs from the target ratio of 9:4:8 for each projector. However, the combined light source output value (composite brightness) of projectors 1 and 2 is Pr:Pg:Pb = 58.5 (W):26.5 (W):52.5 (W), and the ratio of these is approximately the same as the target ratio of 9:4:8. Therefore, the target white balance is obtained in stack projection.

[0048] And, compared to the temperature adjustment amount (maximum value -20°C) of the color LD light source in one projector explained in Fig. 4(c), the temperature adjustment amount (maximum value -15°C) of the color LD light source in two projectors explained in Fig. 5(c) is smaller. That is, in this embodiment, the temperature adjustment parameter for each LD light source is calculated so that the maximum value of the change amount of the temperature adjustment parameter for each LD light source is the smallest.

[0049] As described above, according to this embodiment, good white balance adjustment can be performed in stack projection by the projectors 1 and 2.

[0050] The temperature control method of the LD light source in this embodiment is merely an example, and other temperature control methods may be used. Also, the output characteristics of the LD light sources of each color shown in Figures 3(a) to (c) and the numerical values ​​in Figures 4(a) to (c) and Figures 5(a) to (c) are merely examples, and other output characteristics and numerical values ​​may be used. Furthermore, in this embodiment, a case has been described in which a Peltier element is used to cool the LD light source, but other cooling methods such as a liquid cooling pump or an air cooling fan may also be used. EXAMPLES

[0051] 6 shows a flow chart of white balance adjustment processing executed in stack projection by the control unit 160 of the projector 1 as the master projector in the embodiment 2. The configurations of the projectors 1 and 2 in the embodiment are the same as those in the embodiment 1, but the processing executed by the control unit 160 is different from that in the embodiment 1.

[0052] The processes from S1 to S4 and the processes from S7 to S9 are respectively the same as the processes from S1 to S4 and the processes from S7 to S9 in FIG.

[0053] The control unit 160, which has acquired information (see FIG. 3) regarding the output characteristics of the LD light sources of each color of the projectors 1 and 2 in S3 and S4, causes the calculation unit 180 to calculate current adjustment parameters as brightness adjustment parameters of the LD light sources of each color of the projectors 1 and 2 based on the information in S15.

[0054] In this embodiment, unlike the first embodiment in which the temperature adjustment parameters were calculated, a current adjustment parameter indicating the drive current value of each color LD light source is calculated. The light source output value can be controlled by adjusting the drive current value of each color LD light source based on the current adjustment parameter. When calculating the current adjustment parameter, as in the first embodiment, the calculation is performed so that the ratio of the composite brightness of each color light in stack projection becomes a ratio according to the target white balance. Also in this embodiment, the current adjustment parameter for each LD light source is calculated so that the maximum value of the change amount of the current adjustment parameter for each LD light source becomes the smallest. In the next S16, the control unit 160 adjusts the brightness of each color LD light source by setting the drive current value of each color LD light source based on the current adjustment parameter calculated for each color LD light source of the projector 1 in S15. Also, the control unit 160 transmits the current adjustment parameter calculated for each color LD light source of the projector 2 to the projector 2 through the communication units 400 and 800. This causes the control unit 560 of the projector 2 to set the drive current value of each color LD light source based on the current adjustment parameter to adjust the brightness. In this embodiment, the temperature adjustment units of the projectors 1 and 2 are driven to suppress changes in the temperature of the LD light sources of each color due to changes in the drive current value (to maintain the temperature constant).Then, the process proceeds to S7.

[0055] According to this embodiment, excellent white balance adjustment can be performed in stack projection by the projectors 1 and 2.

[0056] The projectors in the above-mentioned first and second embodiments use LD light sources, but may use other light sources such as LEDs. Also, the projectors in the first and second embodiments have light sources of three colors, R, G, and B, but may have light sources of two or more colors.

[0057] In addition, in the first and second embodiments, the case where two projectors perform stack projection has been described, but the processing of each embodiment may be performed when stack projection is performed by three or more projectors.

[0058] In addition, in the first and second embodiments, the temperature adjustment parameter and the current adjustment parameter are used separately as the brightness adjustment parameters. However, the brightness of the light source may be adjusted using both the temperature adjustment parameter and the current adjustment parameter.

[0059] Furthermore, in the first and second embodiments, a processing device (control unit 160) included in projector 1 as a master projector performs brightness adjustment processing for both projectors 1 and 2. Alternatively, a processing device configured with a personal computer or the like may be provided separately from projectors 1 and 2, and the processing device may perform brightness adjustment processing for both projectors 1 and 2. Also, projectors 1 and 2 may each include a processing device and perform brightness adjustment processing for their own projector while checking the brightness of the other projector. The above embodiments include the following configurations.

[0060] (Configuration 1) A processing device that controls outputs of a plurality of light sources that emit different color lights and are included in each of a plurality of image projection devices when stack projection is performed by the plurality of image projection devices, an acquisition unit for acquiring information regarding an output characteristic of each of the light sources in the plurality of image projection devices; A processing device characterized by having a control means that controls the output of each of the light sources based on information about the output characteristics so that the ratio of the composite brightness of each of the color lights in the stack projection corresponds to a target white balance. (Configuration 2) 2. The processing device according to configuration 1, wherein the control means controls the output of each of the light sources so as not to decrease the output. (Configuration 3) The light source changes the output by changing a specific parameter, 3. The processing device according to claim 1, wherein the control means sets the specific parameter for each of the light sources so that a maximum value of a change amount of the specific parameter for each of the light sources is minimized. (Configuration 4) the specific parameter is the temperature of the light source; 4. The processing device according to configuration 3, wherein the control means controls a temperature adjustment means provided for each of the light sources to change the temperature, thereby controlling the output. (Configuration 5) the specific parameter is a driving current value of the light source, 4. The processing device according to configuration 3, wherein the control means controls the output by changing the drive current value for each of the light sources. (Configuration 6) 6. The processing device according to any one of configurations 1 to 5, wherein the control unit changes the target white balance in accordance with a projection mode selected by a user. (Configuration 7) An image projection device including the processing device according to any one of configurations 1 to 6, The image projection device, characterized in that the processing device controls the output of each of the multiple light sources of an image projection device equipped with the processing device, and also controls the output of each of the multiple light sources of another image projection device via communication. (Other Examples) The present invention can also be realized by a process in which a program for implementing one or more of the functions of the above-described embodiments is supplied to a system or device via a network or a storage medium, and one or more processors in a computer of the system or device read and execute the program. The present invention can also be realized by a circuit (e.g., ASIC) that implements one or more of the functions.

[0061] The embodiments described above are merely representative examples, and various modifications and alterations are possible for each embodiment when implementing the present invention. [Explanation of symbols]

[0062] 1,2 Projector 140r,540r R panel 140g,540g G panel 140b,540b B Panel 160,560 Control section 180,580 Computing Department 200r, 600r R-LD light source 200g,600g G-LD light source 200b, 600b B-LD light source 210r,610r,210g,610g,210b,610b Temperature Control Unit

Claims

1. A processing device that controls outputs of a plurality of light sources that emit different color lights and are included in each of a plurality of image projection devices when stack projection is performed by the plurality of image projection devices, an acquisition unit for acquiring information regarding an output characteristic of each of the light sources in the plurality of image projection devices; A processing device characterized by having a control means that controls the output of each of the light sources based on information about the output characteristics so that the ratio of the composite brightness of each of the color lights in the stack projection corresponds to a target white balance.

2. 2. The processing apparatus according to claim 1, wherein the control means controls the output of each of the light sources so as not to decrease the output.

3. The light source changes the output by changing a specific parameter, 2. The processing apparatus according to claim 1, wherein the control means sets the specific parameter for each of the light sources so that a maximum value of a change amount of the specific parameter for each of the light sources becomes smallest.

4. the specific parameter is the temperature of the light source; 4. The processing apparatus according to claim 3, wherein the control means controls a temperature adjustment means provided for each of the light sources to change the temperature, thereby controlling the output.

5. the specific parameter is a driving current value of the light source, 4. The processing device according to claim 3, wherein the control means controls the output by changing the drive current value for each of the light sources.

6. The processing device according to claim 1 , wherein the control unit changes the target white balance in accordance with a projection mode selected by a user.

7. An image projection device comprising the processing device according to any one of claims 1 to 6, The image projection device, characterized in that the processing device controls the output of each of the multiple light sources of an image projection device equipped with the processing device, and also controls the output of each of the multiple light sources of another image projection device via communication.

8. 1. A processing method for controlling outputs of a plurality of light sources that emit different color lights and are included in each of a plurality of image projection devices when stack projection is performed using the plurality of image projection devices, comprising: acquiring information regarding output characteristics of each of the light sources in the plurality of image projection devices; and controlling the output of each of the light sources based on information about the output characteristics so that the ratio of the composite brightness of each of the color lights in the stack projection corresponds to a target white balance.

9. A program for causing a computer to execute a process according to the processing method of claim 8.

Images