JP2019146047A - Display device and program - Google Patents

Abstract

To make a light amount difference among videos, displayed by a plurality of display devices, hard to be viewed.SOLUTION: A projection device 1a which, in cooperation with a projection device 1b, displays a display image based on an input image of a display target includes: a control information generation unit 176 which identifies a first order in which the self-device starts to change an amount of light of a first light source, and a second order, after the first order, in which a projection device 1b starts to change an amount of light of a second light source different from the first light source; a light source control unit 173 which displays a first display image corresponding to a first region of the input image, while changing the amount of light of the first light source in a first light amount change time corresponding to the first order; and a communication control unit 177 which notifies the projection device 1b which displays a second display image to a second region different from the first region of the input image of a second light amount change time, corresponding to the second order, which is shorter than the first light amount change time.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a display device and a program.

  A technique for displaying one entire image by combining display images displayed by a plurality of display devices is known. When displaying a whole image by combining a plurality of display devices, there has been a problem that the whole image will be broken if the timings at which each of the plurality of display devices starts displaying the display image are shifted. In response to this problem, Patent Document 1 discloses a technique for synchronizing the display timing of an image between a plurality of display devices based on time information included in an image signal.

JP 2017-3925 A

  With the technique of Patent Literature 1, it is possible to synchronize the timing at which image display is started in a plurality of display devices. However, there is a problem that even if images are displayed synchronously on a plurality of display devices, a light amount difference may be visually recognized between display images displayed by the plurality of display devices. For example, when the light amount of a light source such as a projector lamp or a backlight of a display is changed according to an image, if the change timing of the light amount is different for each display device, the light amount difference is visually recognized.

  Therefore, the present invention has been made in view of these points, and an object thereof is to provide a display device that makes it difficult to visually recognize a light amount difference between display images displayed by a plurality of display devices.

  In the first aspect of the present invention, the display device displays a display image based on an input image to be displayed in conjunction with another display device, and the device itself starts changing the light amount of the first light source. Specifying means for specifying a first order to be performed, and a second order after the first order in which the other display device starts changing the amount of light of the second light source different from the first light source; Display control means for displaying a first display image corresponding to the first region of the input image while changing the light amount of the first light source in a first light amount change time corresponding to the order, corresponding to the second order, Notification means for notifying the other display device that displays a second display image in a second region different from the first region of the input image, a second light amount change time shorter than the first light amount change time; A display device including the display device is provided.

  In the second aspect of the present invention, the display device displays a display image based on an input image to be displayed in conjunction with another display device, and the device itself starts changing the light amount of the first light source. Specifying means for specifying the first order to be performed and the second order before the first order in which the other display device starts changing the light quantity of the second light source different from the first light source; Display control means for displaying the first display image while changing the light amount of the first light source in a first light amount change time corresponding to the order; and the first region of the input image corresponding to the second order; A display device comprising: a notification unit configured to notify a second light amount change time longer than the first light amount change time to the other display device that displays a second display image in a different second region. provide.

  In the third aspect of the present invention, the first display image corresponding to the first region of the input image to be displayed is displayed in the first order while changing the light amount of the first light source during the first light amount change time. A display device that displays, in conjunction with another display device, a second display image corresponding to a second region different from the first region in a second order after the first order, wherein the second order Acquisition means for acquiring the notification, and the second light source corresponding to the second order and changing the light quantity of the second light source different from the first light source in a second light quantity change time shorter than the first light quantity change time. And a display control means for displaying two display images.

  In the fourth aspect of the present invention, the first display image corresponding to the first region of the input image to be displayed is displayed in the first order while changing the light amount of the first light source during the first light amount change time. A display device that displays, in conjunction with another display device, a second display image corresponding to a second region different from the first region in a second order before the first order, wherein the second order Acquisition means for acquiring the notification, and the second light source corresponding to the second order and changing the light quantity of the second light source different from the first light source in a second light quantity change time longer than the first light quantity change time. And a display control means for displaying two display images.

  In the fifth aspect of the present invention, the processor of the control device that displays a display image by interlocking a plurality of display devices is specified to specify the order in which each of the interlocking display devices starts changing the light amount of the light source. Means, the order is earlier than the first light quantity change time which is the time for changing the light quantity of the first light source of the first display device for displaying the first display image corresponding to the first area of the input image. Is a time for changing the light amount of the second light source different from the first light source of the second display device for displaying the second display image in a second region different from the first region of the input image. The calculation means for calculating the first light amount change time and the second light amount change time so as to shorten the light amount change time, and the first display device are notified of the first light amount change time, and the second display. The second light quantity variation in the device It provides a program for causing to function as a notification means, for notifying the time.

  Advantageous Effects of Invention According to the present invention, there is an effect that it is possible to make it difficult to visually recognize a light amount difference between display images displayed by a plurality of display devices.

It is a figure for demonstrating the outline | summary of the projection apparatus which concerns on 1st Embodiment. It is a figure which shows the function structure of a projection apparatus. It is a flowchart of the process which the projector which operate | moves in master mode performs. It is a flowchart of the process which the projector which operate | moves in a slave mode performs. It is a figure for demonstrating the principle which can make it difficult to visually recognize a light quantity difference. It is a figure for demonstrating the outline | summary of 2nd Embodiment. It is a figure for demonstrating the principle which can make it difficult to visually recognize the light quantity difference in 2nd Embodiment. It is a flowchart of the process which the projection apparatus of the master mode which concerns on 3rd Embodiment performs. It is a flowchart of the process which the projection apparatus of the slave mode which concerns on 3rd Embodiment performs. It is a flowchart of the process which the projection apparatus of the master mode which concerns on 4th Embodiment performs. It is a flowchart of the process which the projection apparatus of the slave mode which concerns on 4th Embodiment performs.

<First Embodiment>
[Outline of Projection Apparatus 1 According to First Embodiment]
FIG. 1 is a diagram for explaining the outline of the projection apparatus 1 according to the first embodiment. The projection device 1a and the projection device 1b are display devices that display a display image, and are, for example, a liquid crystal projector or a display. In this specification, the case where the projection apparatus 1a and the projection apparatus 1b are liquid crystal projectors will be described.

  The projection device 1a and the projection device 1b communicate via the hub 2. However, the present invention is not limited to this, and the projection device 1a and the projection device 1b may be configured not to use the hub 2 as long as they are configured to communicate with each other. For example, the projection device 1a and the projection device 1b may be configured to perform wireless communication using a wireless LAN (Local Area Network) router, and may be configured to be directly connected without using other devices. May be.

  In the first embodiment, a case will be described in which one entire image is displayed using the two projection apparatuses 1 of the projection apparatus 1a and the projection apparatus 1b. In FIG. 1, the projection device 1a displays a first display image Ia corresponding to the first region of the input image. The projection device 1b displays a second display image Ib corresponding to a second area different from the first area of the input image to be displayed. The first display image Ia and the second display image Ib display one whole image on the projection plane.

  The projection apparatus 1a and the projection apparatus 1b have two modes, ie, a master mode and a slave mode, as operation modes when performing display by a plurality of units. The projection apparatus 1 switches the operation mode based on an instruction input from the user. Further, the projection device 1 may switch the operation mode based on an instruction input from an external device connected to the projection device 1. In the following description, it is assumed that the projection apparatus 1a operates in the master mode and the projection apparatus 1b operates in the slave mode.

  The projection device 1a and the projection device 1b have a function of improving the contrast by changing the light amount of the light source according to the input image. If there is a difference between the timing at which the projection device 1a changes the amount of light and the timing at which the projection device 1b changes the amount of light when the input image is switched, the first display image Ia and the second display image Ib are different. A light quantity difference will occur. For this reason, there is a possibility that the light amount difference generated between the first display image Ia and the second display image Ib may be visually recognized by the user.

  Therefore, each of the plurality of projection apparatuses 1 according to the first embodiment controls the light amount of the light source to change the light amount from the light amount before the input image changes to the light amount after the input image changes. Different light intensity change times. For example, among the plurality of projection apparatuses 1, the light quantity change time is shortened as the projection apparatus 1 in which the order of starting the light quantity change is later. Specifically, in the projection device 1b whose display image display order is after the projection device 1a, the projection device 1b changes the second light amount change time during which the light amount is changed, and the projection device 1a changes the first light amount. Make it shorter than the light intensity change time.

  By doing so, it is possible to shorten the time during which a light amount difference occurs between the projection apparatus 1a and the projection apparatus 1b after the input image is changed. Therefore, the plurality of projection devices 1 can make it difficult for the user who visually recognizes the entire image to visually recognize the light amount difference between the display images displayed by each of the plurality of projection devices 1.

[Functional configuration of projection apparatus 1a operating in master mode]
First, the functional configuration of the projection apparatus 1a that operates in the master mode will be described. FIG. 2 is a diagram showing a functional configuration of the projection apparatus 1a.

  The projection apparatus 1 includes a communication unit 101, an operation unit 102, an image input unit 103, a light source 11, a color separation unit 12, a light modulation element 13, a color composition unit 14, a projection optical system 15, and a RAM. (Random Access Memory) 161, ROM (Read Only Memory) 162, CPU (Central Processing Unit) 17, image processing unit 171, light modulation element control unit 172, light source control unit 173, and projection optical system control A unit 174, a feature amount calculation unit 175, a control information generation unit 176, and a communication control unit 177. Communication unit 101, operation unit 102, image input unit 103, RAM 161, ROM 162, CPU 17, image processing unit 171, light modulation element control unit 172, light source control unit 173, projection optical system control unit 174, feature quantity calculation unit 175, control The information generation unit 176 and the communication control unit 177 are connected to each other by a bus 19.

  The communication unit 101 transmits and receives control signals, still image data, moving image data, and the like with an external device. The communication method of the communication unit 101 may be a wireless LAN, a wired LAN, USB (Universal Serial Bus), Bluetooth (registered trademark), or the like, and the communication method is not particularly limited. Further, if the image input unit 103 is, for example, an HDMI (High-Definition Multimedia Interface) (registered trademark) terminal, CEC (Consumer Electronics Control) communication may be performed via the terminal. Here, the external device may be any device such as a personal computer, a camera, a mobile phone, a smartphone, a hard disk recorder, a game machine, or a remote controller as long as it can communicate with the liquid crystal projector 100. .

  The image input unit 103 receives an input image transmitted from an external device. Here, the external device may be any device that can output an image signal. The image input unit 103 reads an image recorded on a medium such as a USB flash memory or an SD card. The image input unit 103 outputs the received image data to the image processing unit 171. Further, the image input unit 103 superimposes and outputs an arbitrary OSD (On Screen Display) such as a GUI (Graphical User Interface) or a test pattern on the received image based on an instruction from the CPU 17. Further, the image input unit 103 may output the received image to the RAM 161 based on an instruction from the CPU 17.

  The operation unit 102 receives an instruction from the user and transmits an instruction signal to the CPU 17. The operation unit 102 includes, for example, a switch and a dial. Further, the operation unit 102 may include a signal receiving unit (such as an infrared receiving unit) that receives a signal from the remote controller, and may transmit a predetermined instruction signal to the CPU 17 based on the received signal.

  The light source 11 outputs light for projecting an image on the screen. The light source 11 is, for example, a halogen lamp, a xenon lamp, a high-pressure mercury lamp, a laser, an LED, or a phosphor.

  The color separation unit 12 separates the light output from the light source 11 into red (R), green (G), and blue (B). The color separation unit 12 is configured by, for example, a dichroic mirror or a prism. In addition, when the light source 11 is comprised by LED etc. corresponding to each color, the color separation part 12 is unnecessary.

  The light modulation element 13 </ b> R is a light modulation element corresponding to red, and light modulation of red light among the light separated into red (R), green (G), and blue (B) by the color separation unit 12. Control the rate. The light modulation element 13G is a light modulation element corresponding to green, and controls the light modulation rate of green light among the light separated by the color separation unit 12. The light modulation element 13 </ b> B is a light modulation element corresponding to blue, and controls the light modulation rate of blue light among the light separated by the color separation unit 12.

  The color synthesis unit 14 synthesizes red (R), green (G), and blue (B) light modulated by the light modulation elements 13R, 13G, and 13B. The color synthesizing unit 14 is composed of, for example, a dichroic mirror or a prism.

  The projection optical system 15 projects the light combined by the color combining unit 14 onto the screen. The projection optical system 15 includes a plurality of lenses, lens driving actuators, and the like.

  The ROM 162 stores a control program describing the processing procedure of the CPU 17. The RAM 161 temporarily stores a control program and data as a work memory. The CPU 17 is a control unit that controls each operation block of the projection apparatus 1. The CPU 17 temporarily stores still image data and moving image data received by the communication unit 101 in the RAM 161 and executes the program stored in the ROM 162 to reproduce each image and video. Further, the CPU 17 controls each operation block of the projection apparatus 1 based on a control signal received from the operation unit 102 or the communication unit 101.

  In the present embodiment, the image processing unit 171, the light modulation element control unit 172, the light source control unit 173, the projection optical system control unit 174, the feature amount calculation unit 175, the control information generation unit 176, and the communication control unit 177 include: It is assumed that each is composed of a control microprocessor. However, the present invention is not limited to this, and the CPU 17 executes a program stored in the ROM 162, whereby the image processing unit 171, the light modulation element control unit 172, the light source control unit 173, the projection optical system control unit 174, and the feature amount calculation unit. 175, the control information generation unit 176, and the communication control unit 177 may function.

  The image processing unit 171 performs processing for changing the number of frames, the number of pixels, the image shape, and the like on the input image acquired from the image input unit 103 and transmits the processed image to the light modulation element control unit 172. The image processing unit 171 may perform frame thinning processing, frame interpolation processing, resolution conversion processing, distortion correction processing (keystone correction processing), and the like. For example, the image processing unit 171 performs processing for extending the gradation of the video signal in accordance with the light amount control information calculated by the control information generation unit 176. Note that the image processing unit 171 may perform similar processing not only on the input image acquired from the image input unit 103 but also on the input image reproduced by the CPU 17.

  The light modulation element control unit 172 controls the light modulation rates of the light modulation elements 13R, 13G, and 13B based on the video signal output from the image processing unit 171. Specifically, the light modulation element control unit 172 controls the voltage applied to the light modulation elements of the pixels of the light modulation elements 13R, 13G, and 13B to control the light modulation rates of the light modulation elements 13R, 13G, and 13B. By controlling, the light modulation rate is controlled.

  The projection optical system control unit 174 controls the projection optical system 15. For example, the projection optical system control unit 174 and the lens of the projection optical system 15 are driven by an actuator to perform enlargement, reduction, focus adjustment, and the like of the image.

  The feature amount calculation unit 175 calculates the feature amount of the input image input to the image input unit 103 or the input image output from the image processing unit 171. For example, the feature amount calculation unit 175 calculates an APL (Average Picture Leve) that is an average gradation value of the input image as a feature amount. The feature amount calculation unit 175 may calculate the maximum gradation value, the minimum gradation value, or the histogram included in the image as the feature amount. Note that if the input image is a video, the feature amount calculation unit 175 may calculate the change of the feature amount between images as the feature amount.

  The control information generation unit 176 creates light amount control information for controlling the light source 11. For example, the control information generation unit 176 creates light amount control information including a target light amount that indicates the light amount of the display image and a light amount change time that indicates a time during which the light amount of the display image is changed. The target light amount is a light amount suitable for the feature amount of the display image after the change when the display image changes.

  The control information generation unit 176 specifies a target light amount when the projection device 1a displays the first display image Ia based on the feature amount calculated by the feature amount calculation unit 175. When the communication control unit 177 (to be described later) acquires a feature amount from the projection device 1b via the communication unit 101, the control information generation unit 176 causes the projection device 1b to display a display image based on the feature amount acquired from the projection device 1b. Specify the target light intensity for display. The control information generation unit 176 identifies the target light amounts of the projection device 1a and the projection device 1b based on both the feature amount calculated by the feature amount calculation unit 175 of the own device and the feature amount acquired from the projection device 1b. Also good. For example, the control information generation unit 176 calculates an average value of the calculated feature value and the acquired feature value, and specifies a target light amount based on the calculated average value.

  In addition, the control information generation unit 176 functions as a time calculation unit that calculates the light amount change time until the light amount of the display image becomes the target light amount. For example, the control information generation unit 176 calculates the light amount change time based on the order of starting display of the display image. The control information generation unit 176 functions as a specifying unit that specifies the order in which the plurality of projection apparatuses 1 start displaying the display image, and calculates the light amount change time based on the specified order.

  The control information generation unit 176 specifies the first order in which the projection device 1a starts changing the light amount of the light source 11, and the second order in which the projection device 1b starts changing the light amount of the light source 11. Specifically, when the projection apparatus 1a operates in the master mode and the projection apparatus 1b operates in the slave mode, a transmission delay occurs until the light amount control information transmitted from the projection apparatus 1a reaches the projection apparatus 1b. Therefore, the timing at which the projection device 1b starts changing the amount of light is later than the timing at which the projection device 1a starts changing the amount of light. Therefore, the control information generation unit 176 of the projection device 1a specifies that the first order in which the projection device 1a starts changing the light amount is earlier than the second order in which the projection device 1b starts changing the light amount.

The control information generation unit 176 calculates a first light amount change time corresponding to the first order and a second light amount change time corresponding to the second order and shorter than the first light amount change time. For example, the control information generation unit 176 calculates the second light amount change time corresponding to the later projection device 1b based on the first light amount change time corresponding to the previous projection device 1a. Specifically, the control information generation unit 176 calculates the second light amount change time by subtracting the time corresponding to the order of starting the light amount change from the first light amount change time corresponding to the projection device 1a. More specifically, the control information generation unit 176 subtracts a value obtained by multiplying the order P of its own device by the correction coefficient A from the calculated first light amount change time T, thereby corresponding to the projection device 1b. The two light quantity change time TC is calculated.
TC = T−A × P (Formula 1)

  Note that the control information generation unit 176 may calculate the light amount change time based on the communication delay time. For example, the control information generation unit 176 specifies the communication delay time between the other projection apparatus 1 and the own apparatus, and calculates the light amount change time based on the specified communication delay time. Specifically, the control information generation unit 176 sets a time corresponding to the time elapsed from the transmission of the response request requesting the transmission of the response signal to the projection apparatus 1b until the reception of the response signal from the projection apparatus 1b. Identified as communication delay time. For example, the control information generation unit 176 specifies half of the time elapsed from transmission to reception as the communication delay time.

  The control information generation unit 176 specifies the correction coefficient A corresponding to the communication delay time, and calculates the light amount change time by Expression 1 using the specified correction coefficient A. For example, the control information generation unit 176 specifies the correction coefficient A so that the light amount change time becomes shorter as the communication delay time becomes longer. Specifically, the control information generation unit 176 increases the correction coefficient A as the communication delay time is longer.

  The light source control unit 173 functions as a display control unit that changes the light amount of the display image by controlling on / off of the light source 11 and the light amount. For example, the light source control unit 173 displays the first display image Ia while increasing the light amount in the first light amount change time corresponding to the first order. Specifically, the light source control unit 173 increases the light amount of the first display image Ia by increasing the light emission amount of the light source 11 that projects the display image based on the target input image to be displayed based on the light amount control information. . More specifically, the light source control unit 173 increases the light emission amount by increasing the voltage or current applied to the light source 11. The light source control unit 173 may control the light emission amount by driving an iris (aperture) or a mechanical shutter.

  The communication control unit 177 transmits / receives information to / from an external device via the communication unit 101. For example, the communication control unit 177 functions as a notification unit that notifies the projection device 1b corresponding to the second order of the second light amount change time shorter than the first light amount change time. Further, the communication control unit 177 acquires the feature amount of the input image input to the projection device 1b from the projection device 1b via the communication unit 101.

[Functional configuration of projection apparatus 1b operating in slave mode]
Next, the functional configuration of the projection apparatus 1b that operates in the slave mode will be described. The projection device 1b has the same configuration as the projection device 1a. Hereinafter, the functional configuration of the projection apparatus 1b will be described with respect to differences from the projection apparatus 1a, and similar points will be omitted as appropriate.

  When the communication control unit 177 of the projection device 1b operating in the slave mode receives a notification requesting transmission of the feature amount of the input image from the projection device 1a, the feature of the input image calculated by the feature amount calculation unit 175 of the projection device 1b. The quantity is transmitted to the projection device 1a. Further, the communication control unit 177 of the projection device 1b acquires the second light amount change time corresponding to the second order from the projection device 1a. When the communication control unit 177 obtains the second light amount change time from the projection device 1a, the light source control unit 173 of the projection device 1b performs the second display while increasing the light amount in the second light amount change time shorter than the first light amount change time. The image Ib is displayed.

[Processing executed by the projection apparatus 1a operating in the master mode]
FIG. 3 is a flowchart of processing executed by the projection apparatus 1a operating in the master mode. First, in step S1, the control information generation unit 176 includes a first order in which the projection device 1a starts displaying the first display image Ia, and a second order in which the projection device 1b starts displaying the second display image Ib. Is identified. Next, in step S <b> 2, the communication control unit 177 transmits a notification requesting transmission of feature amounts to the projection apparatus 1 b operating in the slave mode via the communication unit 101.

  In step S3, the communication control unit 177 determines whether or not a feature amount has been received from the projection apparatus 1b operating in the slave mode. If the communication control unit 177 determines that the feature value is not received from the projection device 1b (No in step S3), the communication control unit 177 waits until the feature value is received from the projection device 1b. If the communication control unit 177 determines that the feature amount is received from the projection device 1b operating in the slave mode (Yes in step S3), the communication control unit 177 proceeds to step S4.

  In step S4, the control information generation unit 176 calculates a first light amount change time corresponding to the projection device 1a. Further, the control information generation unit 176 calculates a second light amount change time that is shorter than the first light amount change time corresponding to the projection device 1b. In step S5, the control information generation unit 176 notifies the light source control unit 173 of the projection device 1a of the first light quantity change time. In step S6, the communication control unit 177 notifies the projection device 1b of the second light quantity change time. When the process of step S6 ends, the projection device 1a proceeds to step S1. The projection device 1a repeats the processing from step S1 to step S6 while the input image is input.

[Processing executed by the projection apparatus 1b operating in the slave mode]
FIG. 4 is a flowchart of processing executed by the projection apparatus operating in the slave mode. First, in step S <b> 21, the communication control unit 177 of the projection device 1 b determines whether a notification requesting transmission of a feature amount is received from the projection device 1 a operating in the master mode via the communication unit 101.

  If the communication control unit 177 determines that the notification requesting the transmission of the feature value has not been received (No in step S21), the communication control unit 177 waits until the notification requesting the transmission of the feature value is received. If the communication control unit 177 determines that a notification requesting transmission of the feature value has been received (Yes in step S21), the communication control unit 177 proceeds to step S22. In step S22, the communication control unit 177 transmits the feature amount calculated by the feature amount calculation unit 175 of the projection device 1b to the projection device 1a via the communication unit 101.

  In step S23, the communication control unit 177 determines whether or not the second light amount change time is received from the projection apparatus 1a operating in the master mode via the communication unit 101. If the communication control unit 177 determines that the second light quantity change time has not been received from the projection apparatus 1a (No in step S23), the communication control unit 177 waits until the second light quantity change time is received from the projection apparatus 1a. If the communication control unit 177 determines that the second light amount change time has been received from the projection device 1a (Yes in step S23), the communication control unit 177 proceeds to step S24. In step S24, the light source control unit 173 displays the second display image Ib while increasing the light amount in the second light amount change time shorter than the first light amount change time received from the projection device 1a. When the process of step S24 ends, the projection device 1b proceeds to step S21. The projection device 1a repeats the processing from step S21 to step S24 while the input image is input.

[Principle that makes it difficult to see the difference in light intensity]
Hereinafter, the projection device 1b displays the second display image Ib while increasing the light amount in the second light amount change time shorter than the first light amount change time, thereby causing a light source control synchronization deviation between the projection devices 1. A principle that makes it difficult to visually recognize the difference in light amount will be described. FIG. 5 is a diagram for explaining a principle that makes it difficult to visually recognize the light amount difference. In FIG. 5, the horizontal axis indicates the time when the unit is the number of frames. In the following description, the projection device 1a creates light amount control information including the target light amount and the light amount change time based on the feature amount acquired from the projection device 1b and the feature amount calculated by the projection device 1a. To do.

  (5-1) of FIG. 5 is a schematic diagram showing a time change of the input image. In (5-1) of FIG. 5, it is shown that a dark image is input until time t1, and a bright image is input from time t1. It is assumed that the left half of the input image is input to the projection apparatus 1a and the right half is input to the projection apparatus 1b. In (5-2) of FIG. 5, a number surrounded by a square indicates a target light amount that is a target value of the output light amount.

  (5-3) in FIG. 5 is a diagram showing a change in output light amount with respect to time in the projection apparatus 1a. (5-4) in FIG. 5 is a diagram showing a change in output light amount with respect to time in the projection apparatus 1b. (5-3) in FIG. 5 shows an example in which the target light amount is 100% and the light amount change time is 4 frames. In (5-4) of FIG. 5, when the projection apparatus 1a and the projection apparatus 1b change the light quantity in the same light quantity change time (broken line b1) as in the conventional case, the second light quantity change of the projection apparatus 1b. The case where time is shorter than the 1st light quantity change time of the projector 1a (solid line b2) is shown.

  In the example of (5-3) in FIG. 5, the projection device 1a starts displaying the display image at time t2. As shown in (5-3) of FIG. 5, the projection apparatus 1a increases the output light amount of the light source 11 so that the output light amount becomes 100% over 4 frames from time t2 to t6. Let

  The projection device 1a transmits light amount control information including the same output light amount and light amount change time as that of the projection device 1a to the projection device 1b. Since the light amount control information is transmitted from the projection apparatus 1a to the projection apparatus 1b via the communication path, a delay in the communication path and a delay in the hub 2 occur. Here, the projection device 1b starts the light amount control based on the light amount control information at a time t3 delayed by one frame period from the time t2 when the projection device 1a starts the light amount control based on the light amount control information. To do.

  In this case, as indicated by a broken line b1 in (5-4) in FIG. 5, the projection apparatus 1b operating in the conventional method is configured to have a light amount of 100% over a period of four frames from time t3 to t7. Increase the output light intensity. On the other hand, as indicated by the solid line b2 in (5-4) of FIG. 5, the projection apparatus 1b operating with the method according to the present embodiment has a light amount of 100% over a period of three frames from time t3 to t6. The output light quantity is increased so that

(5-5) in FIG. 5 is a schematic diagram showing a difference between the output light amount of the projection device 1a and the output light amount of the projection device 1b. Dashed E1 _ab of (5-5) of FIG. 5, the output light amount when the projection apparatus 1b is increased amount of output light such that the quantity of light of 100% over the four frames of time from the time t3 to t7 Indicates the difference.

As indicated by the broken line E1 _ab in (5-5) in FIG. 5, when the conventional method is used, the difference in the output light amount between the projection apparatus 1a and the projection apparatus 1b in the time corresponding to five frames from time t2 to t7. Occurs. In addition, there is a high possibility that the light amount difference is visually recognized by the user during a period corresponding to three frames from time t3 to time t6 in which the output light amount difference between the projection device 1a and the projection device 1b is the maximum.

On the other hand, when the method according to the present embodiment is used, as shown by the solid line _E2ab , the period in which the difference in the output light amount occurs is shortened to a time corresponding to four frames from time t2 to t6. Therefore, since the projector 1 can shorten the time during which the light amount difference occurs, it is difficult for the user to visually recognize the light amount difference. In addition, the period during which the output light amount difference between the projection device 1a and the projection device 1b is maximum is only the time t3, and the time during which a large light amount difference is obtained is shortened. Therefore, the projection device 1 can reduce the possibility that the user will visually recognize the light amount difference.

  Although FIG. 5 shows an example in which control is performed so that the amount of light change per unit time when changing the amount of light is constant, the method of changing the amount of light of the light source 11 is not limited. The projection device 1 only needs to be able to control the amount of light so that it becomes the target amount of light during a predetermined amount of light change time. In this embodiment, the light amount change time is expressed by a frame. However, the light amount change time may be an actual time and the light amount of the light source may be controlled with an accuracy shorter than a frame unit.

  In the above description, it is assumed that the time for shortening the second light quantity change time with respect to the first light quantity change time is the same as the communication delay time. However, the present invention is not limited to this, and the projection device 1 does not depend on the magnitude relationship between the time for shortening the second light amount change time relative to the first light amount change time and the delay time due to communication, but the light amount of the second light amount control information. What is necessary is just to make change time shorter than the light quantity change time of 1st light quantity control information. The projection device 1 can shorten the time during which the light quantity difference occurs by shortening the second light quantity change time from the first light quantity change time.

(Modification)
In the above description, it is assumed that the order in which the projection device 1b starts changing the light amount of the light source 11 is after the timing at which the projection device 1a starts changing the light amount of the light source 11. Not limited to this, the order in which the projection device 1b starts changing the light amount of the light source 11 may be before the timing at which the projection device 1a starts changing the light amount of the light source 11. Specifically, the control information generation unit 176 of the projection apparatus 1a sets the second light quantity change time to be notified to the projection apparatus 1b that starts changing the light quantity of the light source 11 before the projection apparatus 1a. It may be longer than the time.

[Effects of Projecting Apparatus 1a according to First Embodiment]
As described above, the projection device 1a operating in the master mode displays the display image while increasing the light amount during the first light amount change time corresponding to the first order, thereby displaying the first display image Ia. The light quantity of the light source 11 is increased. Further, the projection device 1b operating in the slave mode displays the second display image Ib while increasing the light amount of the light source 11 in the second light amount change time shorter than the first light amount change time. By doing in this way, since the projector 1a can shorten the time when the difference in the output light amount occurs, it is difficult for the user viewing the display image to see the difference in the light amount.

<Second Embodiment>
[Outline of Second Embodiment]
The second embodiment is an embodiment in which four projection devices 1 are used to display one entire image. FIG. 6 is a diagram for explaining the outline of the second embodiment. In FIG. 6, the projection device 1a displays a first display image Ia corresponding to the upper left area of the entire image. Similarly, the projection device 1b displays the second display image Ib corresponding to the upper right region of the entire image, and the projection device 1c displays the third display image Ic corresponding to the lower right region of the entire image. 1d displays a fourth display image Id corresponding to the lower left area of the entire image. Further, the projection device 1a to the projection device 1b are connected via the hub 2 in order to communicate with each other.

  In the second embodiment, description will be made assuming that the projection apparatus 1a operates in the master mode and the projection apparatuses 1b, 1c, and 1d operate in the slave mode. When the projection device 1a transmits the light amount control information to each of the projection devices 1b, 1c, and 1d, a delay in the communication path and a delay in the hub 2 occur as in the first embodiment. Therefore, if the projection device 1a transmits the same light amount change time to each of the projection devices 1b, 1c, and 1d, there is a possibility that a light amount difference is generated between the display images.

Therefore, the projection device 1a according to the second embodiment corrects the light amount change time based on the order in which the light amount control information is transmitted. Specifically, first, the control information generation unit 176 of the projection device 1a specifies the order in which the other connected projection devices 1 start changing the light amount. Next, the control information generation unit 176 of the projection device 1a has the second light amount whose light amount change time corresponding to the projection device 1 in the next order is relatively shorter than the light amount change time corresponding to the projection device 1 in the previous order. Calculate the change time. Specifically, when the projection apparatus 1a transmits the light amount control information in the order of the projection apparatuses 1b, 1c, and 1d, the light amount change times of the projection apparatuses 1a, 1b, 1c, and 1d are respectively T1, T2, T3, And T4, calculation is performed so as to satisfy the following (Formula 2).
T1>T2>T3> T4 (Formula 2)

  The communication control unit 177 of the projection device 1a transmits the light amount change time corresponding to the order in order from the projection device 1 that is in the order. Specifically, the projection device 1a transmits a light amount change time corresponding to the projection device 1b to the projection device 1b, and then transmits a light amount change time corresponding to the projection device 1c to the projection device 1c. Further, the projection device 1a transmits the light amount change time corresponding to the projection device 1c to the projection device 1c, and then transmits the light amount change time corresponding to the projection device 1d to the projection device 1d.

  With reference to FIG. 7, the principle that makes it difficult to visually recognize the light amount difference caused by the synchronization deviation of the light source control among the plurality of projection apparatuses 1 will be described in detail. In FIG. 7, the horizontal axis indicates the time when the unit is the number of frames. The broken line in FIG. 7 indicates the difference between the output light amount of each projection device 1 and the output light amount among the plurality of projection devices 1 when the conventional method is used, and the solid line uses the method according to the present embodiment. The difference between the output light amount of each projection device 1 and the output light amount among the plurality of projection devices 1 is shown.

  Similar to the first embodiment, since the light amount control information is transmitted from the projection device 1a to each of the projection devices 1b, 1c, and 1d via the communication path, a delay in the communication path and a delay in the hub 2 occur. .

The projection apparatus 1a according to the present embodiment transmits light amount control information including different light amount change times to each of the plurality of projection apparatuses 1 operating in the slave mode. Specifically, the projection device 1a calculates the light amount change time of each of the plurality of projection devices 1 operating in the slave mode based on the identified order. More specifically, when the projection device 1a calculates the first light amount change time T1 of the projection device 1a as 4 frames, the light amount change time is calculated as follows.
Second light amount change time T2 corresponding to the projection device 1b = 3 frames Third light amount change time T3 = 2 frames corresponding to the projection device 1c Fourth light amount change time T4 = 1 frame corresponding to the projection device 1d

  Each of the plurality of projection devices 1 operating in the slave mode displays a display image while increasing the light amount during the light amount change time corresponding to the own device transmitted from the projection device 1a. A solid line b2 in FIG. 7 indicates the output light amount when the projection apparatus 1b increases the output light amount in the second light amount change time T2. Similarly, a solid line c2 indicates the output light amount when the projection device 1c increases the output light amount in the third light amount change time T3 corresponding to the own device. Similarly, the solid line d2 indicates the output light quantity when the projection apparatus 1d increases the output light quantity during the fourth light quantity change time T4 corresponding to the own apparatus.

  A solid line E2 in FIG. 7 indicates two projections for displaying adjacent display images on the projection surface when the projection apparatus 1a transmits different light amount change times to each of the plurality of projection apparatuses 1 operating in the slave mode. The difference of the output light quantity of the apparatus 1 is shown.

The solid line E2 _ab in FIG. 7, showing the difference in the output light amount of the projection apparatus 1a projection apparatus 1b, the light amount difference occurs in the four frame periods of time t6 from time t2. A solid line E2 _bc indicates a difference in output light amount between the projection device 1b and the projection device 1c, and a light amount difference occurs in a three-frame period from time t3 to time t6. A solid line E2 _cd indicates a difference in output light amount between the projection device 1c and the projection device 1d, and a light amount difference occurs in a two-frame period from time t4 to time t6. The solid line E2 _ad represents the difference between the output light amount of the projection apparatus 1a projection device 1d, the light amount difference occurs in the four frame periods of time t6 from time t2.

  On the other hand, when the conventional method is used, as indicated by broken lines b1, c1, and d1 in FIG. 7, the light amounts in the projection apparatuses 1b, 1c, and 1d change over the four frame periods. As a result, it can be seen that the time during which the state in which the light amount difference between the plurality of adjacent projectors 1 is large continues is longer than when the method according to this embodiment is used. As described above, the projection apparatus 1a has a light quantity change time corresponding to the projection apparatus 1 whose turn of starting the light quantity change is later than a light quantity change time corresponding to the projection apparatus 1 of which the turn is started. By calculating a relatively short light amount change time, a light amount difference between adjacent display images can be reduced.

(Modification)
In the above description, the case where the projection apparatus 1a operates in the master mode has been described as an example. However, all the projection apparatuses 1 may operate in the slave mode. For example, the control device that controls the projection device 1 connected to the hub 2 may be configured to perform processing in the same processing procedure as the projection device 1a operating in the master mode. For example, a PC or a server can be used as the control device.

[Effects of Projecting Apparatus 1a according to Second Embodiment]
As described above, the projection device 1a operating in the master mode according to the second embodiment starts the change in the light amount during the light amount change time corresponding to the later projection device 1 in the order of starting the change in the light amount. A light amount change time that is relatively shorter than the light amount change time corresponding to the earlier projection apparatus 1 is calculated. By doing in this way, since the projector 1a can shorten time when a light quantity difference arises, it can make it difficult for a user to visually recognize a light quantity difference.

<Third Embodiment>
The projection apparatus 1a that operates in the master mode according to the first embodiment and the second embodiment directly transmits the light amount control information to the projection apparatus 1 that operates in the slave mode.

  When the light quantity control information is transmitted and received using three or more projection apparatuses, it may not be possible to guarantee that the order in which the light quantity control information is transmitted and the reception order in which the light quantity control information is received are the same. In this case, when the light amount change time is corrected based on the order in which the projection apparatus 1a transmits the light amount control information, the effect of reducing the light amount difference may be reduced.

  Therefore, in the third embodiment, the amount of light change time and the amount of light of all the projection devices 1 linked to one of the plurality of projection devices 1 operating in the slave mode from the projection device 1 operating in the master mode are changed. Send the order in which to start the change. The projection apparatus 1 that operates in the slave mode that has received the light amount change time of all the projection apparatuses 1 and the order of starting the change of the light quantity controls the light quantity to the projection apparatus 1 whose order of starting the change of the light quantity is after the own apparatus. Send information. By doing in this way, the projection apparatus 1 operating in the slave mode displays the display screen based on the order specified by the projection apparatus 1a even if it is not possible to guarantee that the order and the reception order are the same. Can be made.

[Operation of Projector 1a Operated in Master Mode According to Third Embodiment]
First, the operation of the projection apparatus 1a that operates in the master mode according to the third embodiment will be described. The control information generation unit 176 of the projection apparatus 1a functions as a creation unit that creates order information in which the order of starting the change in the amount of light and the identification information for identifying the projection apparatus 1 are associated with each other. The order information is not limited to a data format as long as the order in which the light quantity control information should be transmitted can be identified. For example, the order information is a data table as follows.
Order 0: Projector 1a
Order 1: Projector 1b
Order 2: Projector 1c
Order 3: Projector 1d

  The communication control unit 177 of the projection device 1a uses the plurality of light amount change times corresponding to each of the plurality of projection devices 1 operating in the slave mode and the created order information to determine the light amount of the projection device 1 operating in the slave mode. It transmits to the projection apparatus 1 with the earliest order to start the change.

  FIG. 8 is a flowchart of processing executed by the projection apparatus 1a in the master mode according to the third embodiment. In the flowchart of FIG. 8, the processing from step S1 to step S5 is the same as the processing executed by the projection apparatus 1a according to the first embodiment, and thus the description thereof is omitted.

  In step S11, the communication control unit 177 of the projection device 1a uses the plurality of light amount change times corresponding to the plurality of connected projection devices 1 and the created order information of the projection device 1 operating in the slave mode. Of these, the projector apparatus 1b in the earliest order is notified. When the projection apparatus 1a completes the process of step S11, the process proceeds to step S1, and the processes from step S1 to step S11 are repeated while the input image is input.

[Operation of Projecting Apparatus 1b Operated in Slave Mode According to Third Embodiment]
Next, the operation of the projection apparatus 1b that operates in the slave mode according to the third embodiment will be described. Note that the projection apparatuses 1c and 1d operating in the slave mode operate in the same manner as the projection apparatus 1b, and thus the description thereof is omitted.

  The communication control unit 177 of the projection device 1b functions as an acquisition unit that acquires a plurality of light amount change times and order information corresponding to each of the plurality of projection devices 1 from the projection device 1a. For example, the communication control unit 177 acquires the order information in which the order of starting the change of the light amount is associated with the identification information for identifying the projection device 1.

  The communication control unit 177 functions as a notification unit that notifies the light source control unit 173 of the own device of the light amount change time corresponding to the order associated with the identification information of the own device indicated in the order information received from the projection device 1a. . Further, the communication control unit 177 notifies the projection apparatus 1 of the order information indicated by the identification information corresponding to the next order of the order associated with the identification information of the own apparatus. Specifically, the communication control unit 177 notifies the order information to the projection apparatus 1c corresponding to the next order of the projection apparatus 1b. Then, the light source control unit 173 displays the display image while increasing the light amount in the light amount change time corresponding to the order associated with the identification information of the own device indicated in the order information.

  FIG. 9 is a flowchart of processing executed by the slave mode projection apparatus 1b according to the third embodiment. In the flowchart of FIG. 9, the processes in step S21 and step S22 are the same as the processes executed by the projection apparatus 1b according to the first embodiment, and thus the description thereof is omitted.

  In step S <b> 30, the communication control unit 177 of the projection device 1 b determines whether or not the light amount change information and the order information are received from another projection device 1. If the communication control unit 177 determines that the light quantity change information and the order information are not received from the other projection apparatuses 1 (No in step S30), the communication control unit 177 waits until the light quantity change information and the order information are received from the other projection apparatuses 1. To do. If the communication control unit 177 determines that the light amount change information and the order information are received from the other projection apparatus 1 (Yes in step S30), the communication control unit 177 proceeds to step S31.

  In step S31, the communication control unit 177 of the projection device 1b notifies the light source control unit 173 of the light amount change time corresponding to the own device among the plurality of received light amount change times. Subsequently, in step S <b> 32, the communication control unit 177 transmits a plurality of light amount change times and order information corresponding to each of the plurality of projection apparatuses 1 to the next projection apparatus 1. For example, when the communication control unit 177 receives the data table exemplified as the order information, the communication control unit 177 specifies that the order of the own apparatus is the order 1, and the projection apparatus 1c corresponding to the order 2 after the order 1 of the own apparatus. A plurality of light quantity change times are notified. When the process of step S32 ends, the projection device 1b proceeds to step S21, and repeats the processes from step S31 to step S32 while the input image is input.

  In the above description, the case where the projection apparatus 1a operates in the master mode has been described as an example. However, the present invention is not limited to this, and it is the same as in the second embodiment that all the projection apparatuses 1 may operate in the slave mode.

[Effect of the projection device 1 according to the third embodiment]
As described above, in the projection device 1 according to the third embodiment, the order of starting the change of the light amount is based on the plurality of light amount change times corresponding to each of the plurality of projection devices 1 and the order information. Notification is made to the projection apparatus 1 after the own apparatus. By doing in this way, the projection apparatus 1 can perform projection that operates in the master mode even when it is not possible to guarantee that the order of starting the change in the amount of light and the reception order are the same in the path used for communication. The light amount change time can be transmitted in the order specified by the device 1a. For this reason, the projection device 1 can reduce the light amount difference when displaying the display image, so that the light amount difference between the display images displayed by each of the plurality of projection devices 1 can be made difficult to be visually recognized by the user.

<Fourth Embodiment>
In the fourth embodiment, as in the second embodiment, the four projectors 1 display one entire image. The projection apparatus 1a that operates in the master mode according to the second embodiment calculates the light amount change time of all the projection apparatuses 1 that operate in the slave mode. However, if the light amount change time of all the projection apparatuses 1 operating in the slave mode is calculated by the projection apparatus 1a, the processing load on the projection apparatus 1a increases. Therefore, each of the plurality of projection apparatuses 1 according to the fourth embodiment calculates the light amount change time corresponding to the own apparatus based on the order information. By doing in this way, the processing load of the projection apparatus 1a which operate | moves in master mode can be reduced.

[Operation of Projecting Apparatus 1a Operated in Master Mode According to Fourth Embodiment]
First, the operation of the projection apparatus 1a that operates in the master mode according to the fourth embodiment will be described. When calculating the light amount change time based on the feature amount, the control information generation unit 176 of the projection device 1a calculates only the light amount change time corresponding to the own device, and calculates the light amount change time corresponding to the other projection devices 1. do not do. The communication control unit 177 of the projection device 1a performs another projection of the light amount change time corresponding to the calculated own device and the order information indicating the second order after the first order in which the own device starts displaying the display image. Transmit to device 1.

  FIG. 10 is a flowchart of processing executed by the projection apparatus 1a in the master mode according to the fourth embodiment. Since the processing from step S1 to step S3 is the same as the processing executed by the projection apparatus 1a according to the first embodiment, the description thereof is omitted. In step S40, the control information generation unit 176 of the projection apparatus 1a calculates only the light amount change time corresponding to the own apparatus. In step S41, the control information generation unit 176 notifies the light source control unit 173 of the light amount change time corresponding to the own device.

  In step S <b> 42, the communication control unit 177 transmits the light amount change time corresponding to the own apparatus and the order information to the other projection apparatus 1. When the projection device 1a finishes the process of step S42, the projection apparatus 1a proceeds to step S1, and repeats the processes from step S1 to step S42 while the input image is input.

[Operation of Projecting Apparatus 1b Operated in Slave Mode According to Fourth Embodiment]
Next, the operation of the projection apparatus 1b that operates in the slave mode according to the fourth embodiment will be described. Note that the projection apparatuses 1c and 1d operating in the slave mode operate in the same manner as the projection apparatus 1b, and thus the description thereof is omitted.

  The communication control unit 177 of the projection device 1b according to the fourth embodiment obtains a notification in the second order after the first order in which the projection device 1a starts changing the light amount of the first display image Ia. Function as. Specifically, the communication control unit 177 acquires the order information and the light amount change time corresponding to the projection device 1a.

  The control information generation unit 176 functions as a time calculation unit that calculates the light amount change time corresponding to the device itself. The control information generation unit 176 subtracts the time corresponding to the order of the own apparatus from the light quantity change time of the projection apparatus 1a in which the order of starting the change of the light quantity is earlier than the order of the own apparatus. Is calculated. Specifically, the control information generation unit 176 subtracts the value obtained by multiplying the order P corresponding to the own device by the correction coefficient A from the received light amount change time T, thereby obtaining the light amount change time TC corresponding to the own device. Is calculated. The correction coefficient A can be set to an arbitrary value, but is preferably set to the same value among the plurality of projection apparatuses 1 operating in the slave mode.

Here, the light amount change time TC calculated by the control information generation unit 176 will be described by substituting specific values. For example, the control information generation unit 176 assumes that the light amount change time T = 4, the order P = 1, and the correction coefficient A = 1.
TC = 4-1 × 1 = 3
And calculate.

  The light source control unit 173 displays the second display image Ib while increasing the light amount in the second light amount change time corresponding to the second order and shorter than the first light amount change time. Specifically, the light source control unit 173 displays the second display image Ib while increasing the light amount during the light amount change time TC calculated by the control information generation unit 176.

  FIG. 11 is a flowchart of processing executed by the slave mode projection apparatus 1b according to the fourth embodiment. In the flowchart of FIG. 11, the processes in step S21 and step S22 are the same as the processes executed by the projection apparatus 1b according to the first embodiment, and thus the description thereof is omitted.

  In step S50, the communication control unit 177 determines whether the light amount change time and order information of the projection apparatus 1a operating in the master mode has been received. If the communication control unit 177 determines that the light amount change time and the order information are not received (No in step S50), the communication control unit 177 stands by until the light amount change time and the order information is received. If the communication control unit 177 determines that the light amount change time and the order information have been received (Yes in step S50), the communication control unit 177 proceeds to step S51.

  In step S51, the control information generation unit 176 calculates a light amount change time corresponding to the order of the own device based on the received light amount change time and the order information. In step S52, the control information generation unit 176 notifies the light source control unit 173 of the calculated light amount change time. When the process of step S52 ends, the projection device 1b proceeds to step S21, and repeats the processes from step S21 to step S52 while the input image is input.

(Modification)
In the above description, the projection device 1 calculates the light amount change time of the own device with reference to the light amount change time of the previous projection device 1 in the order of starting the change of the light amount. However, the present invention is not limited to this, and the projection apparatus 1 may calculate the light quantity change time of the own apparatus with reference to the light quantity change time of the projection apparatus 1 whose turn to start the change of the light quantity is the reference. In this case, the communication control unit 177 of the projection device 1a notifies the projection device 1b of the notification in the second order before the first order.

  The communication control unit 177 of the projection device 1b obtains the notification in the second order before the first order from the projection device 1a. Then, the control information generation unit 176 adds the time corresponding to the order of the own apparatus to the light quantity change time of the projection apparatus 1 after the order of starting the change of the light quantity is later than the order of the own apparatus. Calculate the change time. Specifically, the control information generation unit 176 adds the value obtained by multiplying the received light amount change time T by the correction coefficient A to the order P corresponding to the own device, thereby changing the light amount change time TC corresponding to the own device. Is calculated. The light source control unit 173 of the projection device 1 displays the second display image while increasing the light amount in the second light amount change time corresponding to the second order and longer than the first light amount change time.

  By doing in this way, the projector 1b can reduce the maximum value of the light amount difference generated between the display images. Therefore, the projection device 1b can make it difficult for the user to visually recognize the light amount difference.

[Effect of the projection device 1 according to the fourth embodiment]
As described above, the projection apparatus 1a operating in the master mode according to the fourth embodiment calculates the light amount change time corresponding to the own apparatus. Then, the projection device 1b operating in the slave mode calculates the light amount change time corresponding to the own device based on the light amount change time and the order information calculated by the projection device 1a. By doing so, the projection apparatus 1b according to the fourth embodiment can reduce the processing load of the projection apparatus 1a operating in the master mode.

<Fifth Embodiment>
The fifth embodiment is a control device that displays a display image by interlocking a plurality of display devices. The control device is, for example, a desktop personal computer or a server. In the fifth embodiment, the display device is assumed to be a projection device such as a liquid crystal projector, but may be a liquid crystal display or the like.

  The control device includes a communication unit, a storage unit, and a control unit. The communication unit is a communication interface for communicating with other devices. The communication unit may include a wireless communication module or a USB connection terminal, and the communication method is not particularly limited.

  The storage unit is a storage medium such as a ROM, a RAM, and a hard disk. The storage unit stores a control program describing the processing procedure of the control unit. The control unit is, for example, a CPU. The control unit functions as a specifying unit, a calculation unit, and a transmission control unit by executing a program stored in the storage unit.

  The specifying unit functions as a specifying unit that specifies the order in which each of the interlocking display devices starts changing the light amount. The specifying unit specifies the order of starting the change in the light amount based on the instruction information input from the user or the instruction information input from another device.

  Each of the plurality of display devices functions as a calculation unit that calculates a light amount change time during which the light amount of the light source 11 is changed. Specifically, first, the calculation unit calculates a first light amount change time that is a time during which the display device in the first order increases the light amount of the light source 11. Next, the calculation unit calculates the second light amount change time so that the second light amount change time, which is the time for the display device in the later order to increase the light amount of the light source 11, is shorter than the first light amount change time. . Then, the calculation unit calculates the light amount change time of each of the plurality of display devices so that the light amount change time corresponding to the later display device becomes shorter.

  The transmission control unit functions as a transmission unit that notifies each of the plurality of display devices of the light amount change time corresponding to each of the plurality of display devices. The transmission control unit may transmit the order information indicating the order of starting the change in the light amount together with the light amount change time. If it cannot be ensured that the order in which the light quantity control information is transmitted and the order in which it is received are the same, the transmission control unit displays a plurality of pieces of information in which the light quantity change time and the order information are associated with each of the plurality of display devices. May be transmitted to the display device with the earliest order among the display devices.

[Effect of the control device according to the fifth embodiment]
As described above, the control device according to the fifth embodiment calculates the light amount change time corresponding to each of the plurality of display devices so that the light amount change time becomes shorter as the order becomes later. By doing in this way, the control apparatus can shorten the time which a light quantity difference produces in a display image. Therefore, the control device can make it difficult for the user who views the entire image to visually recognize the light amount difference.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment, A various deformation | transformation and change are possible within the range of the summary. is there. For example, although it has been described as a projection device that projects an image, the present invention is not limited to this, and a display device such as a liquid crystal display may be used. Further, the specific embodiments of the distribution / integration of the devices are not limited to the above-described embodiments, and all or a part of them may be configured to be functionally or physically distributed / integrated in arbitrary units. Can do. In addition, new embodiments generated by any combination of a plurality of embodiments are also included in the embodiments of the present invention. The effect of the new embodiment produced by the combination has the effect of the original embodiment.

DESCRIPTION OF SYMBOLS 1 Projection apparatus 173 Light source control part 175 Feature-value calculation part 176 Control information generation part 177 Communication control part

Claims (12)

A display device that displays a display image based on an input image to be displayed in conjunction with another display device,
A second order after the first order in which the own device starts changing the amount of light of the first light source and the first order in which the other display device starts changing the amount of light of the second light source different from the first light source. A specifying means for specifying the order;
Display control means for displaying a first display image corresponding to a first region of the input image while changing the light amount of the first light source in a first light amount change time corresponding to the first order;
A second light amount change time that is shorter than the first light amount change time on the other display device that displays the second display image in a second region different from the first region of the input image, corresponding to the second order. A notification means for notifying
A display device comprising: A display device that displays a display image based on an input image to be displayed in conjunction with another display device,
A second order before the first order in which the own device starts changing the amount of light of the first light source and the first order in which the other display device starts changing the amount of light of the second light source different from the first light source. A specifying means for specifying the order;
Display control means for displaying the first display image while changing the light quantity of the first light source in a first light quantity change time corresponding to the first order;
A second light amount change time that is longer than the first light amount change time on the other display device that corresponds to the second order and displays a second display image in a second region different from the first region of the input image. A notification means for notifying
A display device comprising: In conjunction with another display device that displays the first display image corresponding to the first region of the input image to be displayed in the first order while changing the light amount of the first light source in the first light amount change time, A display device that displays a second display image corresponding to a second region different from the first region in a second order after the first order,
Obtaining means for obtaining said second order notification;
Display control means for displaying the second display image while changing the light quantity of the second light source different from the first light source in the second light quantity change time corresponding to the second order and shorter than the first light quantity change time. When,
A display device comprising: In conjunction with another display device that displays the first display image corresponding to the first region of the input image to be displayed in the first order while changing the light amount of the first light source in the first light amount change time, A display device that displays a second display image corresponding to a second area different from the first area in a second order before the first order,
Obtaining means for obtaining said second order notification;
Display control means for displaying the second display image while changing the light quantity of the second light source different from the first light source in the second light quantity change time corresponding to the second order and longer than the first light quantity change time. When,
A display device comprising: A feature amount calculating means for calculating a feature amount of the input image;
Based on the feature amount calculated by the feature amount calculation means, a target light amount when the display device displays a display image is specified, and a light amount change time until the light amount of the first light source becomes the target light amount is determined. Time calculating means for calculating;
The display device according to claim 1, further comprising:   The said display control means increases the said light quantity by increasing the light emission amount of said 1st light source which projects the display image based on the input image of the object to display, The any one of Claim 1 to 5 characterized by the above-mentioned. The display device according to item. Obtaining means for obtaining order information in which the order of starting the change in the amount of light of the first light source and identification information for identifying the display device are associated;
Notification means for notifying the order information to the display device indicated by the identification information corresponding to the next order of the order associated with the identification information of the own device;
Further comprising
The display control means displays the display image while increasing the light amount of the first light source in a light amount change time corresponding to the order associated with the identification information of the own device indicated by the order information. The display device according to any one of claims 1 to 6.   The display device according to claim 7, further comprising a creation unit that creates the order information in which the order of starting display of the display image is associated with identification information for identifying the display device.   By subtracting the time corresponding to the order of the own device from the second light amount change time of the other display device, the order of starting the change of the light amount of the first light source before the order of the own device. The display device according to claim 1, further comprising time calculating means for calculating the first light quantity change time.   By adding a time corresponding to the order of the own device to the second light amount change time of the display device after the order of starting the change of the light amount of the first light source is later than the order of the own device. The display device according to claim 1, further comprising time calculation means for calculating the first light quantity change time.   It further includes time calculation means for specifying a communication delay time between the other display device and the own device and calculating the first light amount change time and the second light amount change time based on the specified communication delay time. The display device according to claim 1, wherein the display device is a display device. A processor of a control device that displays a display image by interlocking a plurality of display devices;
A specifying means for specifying the order in which each of the plurality of interlocking display devices starts changing the light amount of the light source;
The order is first, and the order is later than the first light amount change time, which is the time for changing the light amount of the first light source of the first display device that displays the first display image corresponding to the first region of the input image. A second light amount change that is a time for changing the light amount of the second light source different from the first light source of the second display device that displays the second display image in a second region different from the first region of the input image. Calculating means for calculating the first light quantity change time and the second light quantity change time so as to shorten the time; and notifying the first display apparatus of the first light quantity change time, and Notification means for notifying the second light quantity change time;
A program characterized by functioning as