JP2021196447A - Image projection device and image projection system - Google Patents

Abstract

To provide an image projection device that, when performing stack projection, can reduce a deterioration in image quality due to color break with a simple configuration.SOLUTION: An image projection device (1000) can project an image by using a plurality of image projection devices (1000, 4000, 5000), and has: light separation means (70) that separates light from a light source (80) into a plurality of rays of light in different wavelength bands in time division; a light modulation element (400) that is driven according to the wavelength bands of the rays of light obtained by separation performed by the light separation means; and control means (30) that can switch the drive timing of the light modulation element. The drive timing of the light modulation element is different from the drive timing of a light modulation element in at least one another image projection device constituting the plurality of image projection devices.SELECTED DRAWING: Figure 1

Description

The present invention relates to an image projection device and an image projection system.

A DLP (Digital Light Processing) type image projection device using a digital micromirror device (DMD) or the like as a light modulation element (panel) has been put into practical use. In order to express colors by a single-plate DLP method that cannot emit light of each RGB color at the same time, it is necessary to switch the light of each color at high speed by a time division method. Therefore, a method of projecting by rotating a disk-shaped filter called an optical separation means (color wheel) so as to synchronize with an image corresponding to each RGB plane is used. By such a method, RGB images that are switched at high speed by the single plate type DLP method become afterimages on the human retina and are overlapped with each other, and as a result, they are recognized as full-color images.

On the other hand, when the screen moves violently, the afterimages of each color of RGB may shift without overlapping on the human retina, and the color of the shifted portion may be recognized as noise, and this phenomenon is called color break. Patent Document 1 discloses a method for reducing image quality deterioration due to color break.

Japanese Patent No. 3901186

It is also necessary to improve the color break when performing stack projection in which the same signal is input to a plurality of image projection devices and images from a plurality of image projection devices are superimposed to display a high-luminance image.

However, in the method disclosed in Patent Document 1, image data of different frames are output between the image projection devices at the time of stack projection, and appropriate stack projection cannot be performed. Further, in order to execute the method disclosed in Patent Document 1, a delay circuit, a delay time control circuit, or the like is required, which complicates the circuit.

Therefore, an object of the present invention is to provide an image projection device and an image projection system capable of reducing image quality deterioration due to color break with a simple configuration when performing stack projection.

The image projection device as one aspect of the present invention is an image projection device capable of projecting an image using a plurality of image projection devices, and the light from the light source is time-divided into light having a plurality of different wavelength bands. It has an optical separation means for separating into light, an optical modulation element driven according to the wavelength band of the light separated by the optical separation means, and a control means capable of switching the drive timing of the optical modulation element. However, the drive timing of the light modulation element is different from the drive timing of the light modulation element in at least one other image projection device constituting the plurality of image projection devices.

The image projection system as another aspect of the present invention is an image projection system capable of projecting an image using a plurality of image projection devices, and the plurality of image projection devices are connected to an image data output device. The image is projected based on the signal output from the image data output device, and at least one of the plurality of image projection devices is the image projection device.

Other objects and features of the present invention will be described in the following embodiments.

According to the present invention, it is possible to provide an image projection device and an image projection system capable of reducing image quality deterioration due to color break with a simple configuration when performing stack projection.

It is a block diagram of the image projection apparatus in this embodiment. It is explanatory drawing of the driving method of a panel in this embodiment. It is a block diagram of the data output circuit in this embodiment. It is a block diagram of the color wheel in this embodiment. It is a block diagram of the drive parameter generation circuit in this embodiment. It is a block diagram of the image projection system when the mode is set by operating the image projection system in this embodiment. It is a flowchart when the mode is set by operating the image projection system in this embodiment. It is a block diagram of the image projection system in the case of setting a mode by communication between image projection devices constituting the image projection system in this embodiment. It is a flowchart when the mode is set by the communication between the image projection apparatus constituting the image projection system in this embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same members are designated by the same reference numerals, and duplicate description will be omitted.

First, the image projection device according to the present embodiment will be described with reference to FIG. FIG. 1 is a block diagram of an image projection device (PJ1) 1000. The image projection device 1000 projects an image on a projection surface 2000 such as a screen according to the display state of the panel (light modulation element) 400. The operation unit (operation means) 10 turns on / off the power of the image projection device 1000, inputs various projection mode settings, and the like. The control unit (control means) 30 receives the signal of the operation unit 10 and gives a control instruction to the input / image processing block 100, the display data generation block 200, or the drive parameter generation circuit 40, which will be described later. The EEPROM 11 is connected to the control unit 30 and reads and writes various parameters including a setting state set by the operation unit 10 and a shift amount parameter for correcting the deviation amount described later.

The input / image processing block 100 determines the input image data and performs each correction process of the image. The image data input unit 101 receives image data IN1 input from an input unit (not shown) such as an input unit DVI, HDMI (registered trademark), or a display port. The image data processing unit 102 performs noise removal, contour enhancement, image scaling, trapezoidal correction, and the like on the image data from the image data input unit 101, and outputs the image data to the display data generation block 200.

The display data generation block 200 generates display data for displaying the image data output from the input / image processing block 100 on the panel 400, and outputs drive control signals of the light source 80 and the motor 71. The drive data generation unit 201 generates display data for correction (γ correction / luminance unevenness, etc.) according to the characteristics of the panel 400. The data output circuit 202 outputs the RGB display data output from the drive data generation unit 201 to the panel drive unit 300 in chronological order for each color.

The panel drive unit 300 converts the display data into a panel drive signal and outputs the display data to the panel 400. The panel 400 displays according to the drive data output by the panel drive unit 300. The panel 400 of the present embodiment is a panel on which the display can be switched at once. For example, a hold-type liquid crystal panel that accumulates electric charge and displays it, a DMD (digital mirror device) that has a mirror and turns the mirror on and off to express gradation in a unit time, or a liquid crystal display in a unit time. It is a panel that turns ON / OFF to express gradation. However, the panel 400 is not limited to these.

The drive parameter generation circuit 40 outputs the drive control parameters of the light source 80 and the motor 71 according to the settings of the control unit 30. The light source driving unit 60 drives the light source 80 according to the parameters from the drive parameter generation circuit 40. Here, the light source 80 emits laser light, but is not limited thereto. The motor drive unit 50 performs control based on the detection result of the position detection unit 51, the rotation speed and angle of the so-called color wheel (optical separation means) 70, according to the parameters from the drive parameter generation circuit 40. In the present embodiment, the color wheel 70 is mentioned as the light separation means, but other configurations such as a phosphor wheel may be adopted instead of the color wheel 70. Here, the motor 71 is a motor for rotating the color wheel 70.

The light from the light source 80 is focused to a predetermined size of laser light through an illumination optical system 90 including an optical element such as a condenser lens, a fly-eye lens, and a condenser lens. The laser beam focused by the illumination optical system 90 is applied to the color wheel 70. By arranging the color wheel 70 that rotates at high speed between the light source 80 and the panel 400, the panel 400 is irradiated with red, blue, and green light in a time-division manner. This is called a veneer method. For example, when it is desired to project red, the mirror of the panel 400 is turned on only at the moment when the red light is applied to the panel 400. Since the mirror constituting the panel 400 can be turned ON / OFF in microsecond units, such a method can be used.

Next, a display method of the panel 400 will be described with reference to FIG. FIG. 2 is an explanatory diagram of a driving method of the panel 400, and explains a panel driving composed of one panel 400. Vsync in FIG. 2 is a vertical synchronization signal (vertical scanning frequency) of the input video data, and here, a general input frequency is 60 Hz. Image data (input data) input from an input means such as DVI, HDMI, or a display port is input to the image data input unit 101 in the input / image processing block 100 as described above. Upon receiving the input data, the image data processing unit 102 performs each correction on the input image data. As described above, the display data generation block 200 generates display data for driving the panel 400. The drive data generation unit 201 in the display data generation block 200 generates display data that is corrected (γ correction / luminance unevenness, etc.) according to the characteristics of the panel 400 in order to be displayed on the panel 400. The data output circuit 202 generates panel drive data based on the display data.

Next, the data output circuit 202 will be described in detail with reference to FIG. FIG. 3 is a block diagram of the data output circuit 202. The display data output from the drive data generation unit 201 is input to the drive data input unit 211 in the data output circuit 202. The display data for one frame or more is temporarily stored in the RAM (storage means) 213. Specifically, the display data N (R, G, B) shown in FIG. 2A is stored in the RAM 213. The RGB data output division circuit 212 is used, for example, when two panels 400 are provided in the image projection device 1000. Specifically, in the case of a configuration in which data for R and B are displayed on one panel and data for G is displayed on the other panel, the RGB data output division circuit 212 divides the data for R and B and the data for G. And output to each panel. When only one panel 400 is provided in the image projection device 1000, the RGB data output division circuit 212 is unnecessary.

Next, the configuration of the color wheel 70 will be described with reference to FIG. FIG. 4 is a block diagram of the color wheel 70. Here, the color wheel 70 having three colors of R, G, and B is taken as an example, but the configuration of the color wheel 70 is not limited to this. The display data N (R, G, B) temporarily stored in the RAM 213 is read out as drive data from the drive data generation unit 201 in the N + 1 frame. At this time, the panel data N_SF1_R of R is first read as the time-series drive data, and the panel drive unit 300 drives the panel 400 with the read drive data N_SF1_R. At this time, the light from the light source 80 is irradiated to the R portion of the color wheel 70 of FIG. 4, and the image is projected according to the drive data N_SF1_R of the panel 400.

Following the drive data N_SF1_R, the drive data N_SF1_G and N_SF1_B are read out in order, and the panel drive unit 300 drives the panel 400 in the order of the read drive data N_SF1_G and N_SF1_B. At this time, the light from the light source 80 is irradiated in the order of the G portion and the B portion of the color wheel 70 of FIG. 4, and the image is projected according to the drive data N_SF1_G and N_SF1_B of the panel 400. Image projection is realized by continuously driving the display data, the drive data, the panel drive, and the motor of the color wheel according to the panel drive. Further, the timing generation circuit 214 in the data output circuit 202 generates drive timing signals of the light source drive unit 60 and the motor drive unit 50. This drive timing signal is input to the drive parameter generation circuit 40 and serves as the basic timing for driving the light source 80 and the color wheel 70.

Next, the drive parameter generation circuit 40 will be described with reference to FIG. FIG. 5 is a block diagram of the drive parameter generation circuit 40. As described above, the drive parameter generation circuit 40 outputs the drive control parameters of the light source 80 and the motor 71. The light source control circuit 41 sets the brightness from the control unit 30 (laser intensity) or sets the intensity of the light source 80 according to the laser drive mode, and outputs a timing signal related to the control to the data output circuit 202. It receives from and controls the laser which is the light source 80.

The motor drive unit 50 drives the motor based on the control signal from the motor control circuit 42 according to the timing signal (vertical synchronization signal Vsync synchronized with the drive signal of each light modulation element) of the timing generation circuit 214 in the data output circuit 202. Output a signal. The timing signal (Vsync) is, for example, 120 Hz at double speed for an input of 60 Hz, and 100 Hz at double speed for an input of 50 Hz.

The motor 71 detects the position of the motor 71 by the position detection unit 51 (for example, a photoreflector), and performs rotation control so as to match the phase with the timing signal of the timing generation circuit 214. When a photoreflector is used as the position detection unit 51, the rotation position detection in FIG. 4 utilizes the reflectance of the shaft of the motor 71 for rotating the color wheel 70. The position detection unit 51 is not limited to the photoreflector, and a photoreinterruptor, a Hall element of the motor, or the like may be used.

Next, with reference to FIG. 2, the flow of data output from the display data input to the panel 400 in the present embodiment will be described. FIG. 2A shows an example before the application of the present embodiment, and FIG. 2B shows an example after the application of the present embodiment. In FIG. 2A, the color wheel rotation position, the color of the color wheel, and the color of the panel drive data are the same for the image projection device (PJ1) 1000, the image projection device (PJ2) 4000, and the image projection device (PJ3) 5000. This is the case. In this case, the afterimages of each color of RGB are not properly overlapped and shifted in the eyes, and are visually recognized as a color break. On the other hand, in FIG. 2B, the color wheel rotation position, the color of the color wheel, and the color of the panel drive data are the image projection device (PJ1) 1000, the image projection device (PJ2) 4000, and the image projection device (PJ3) 5000. If different. In this case, the afterimages of each color of RGB are appropriately overlapped in the eyes and are not recognized as a color break.

FIG. 2B shows no change for the image projection device (PJ1) 1000 as compared with FIG. 2A, and the output delay and the image projection device (PJ3) 5000 for the image projection device (PJ2) 4000 and the image projection device (PJ3) 5000. The output order of the panel drive data is changed. Regarding the output delay of the image projection device (PJ2) 4000, the output of the display data of the image projection device (PJ1) 1000 to the panel (representing the panel drive data in FIG. 2) is output to each frame and the color wheel rotation position (PJ1). Is started according to R. On the other hand, the output of the display data of the image projection device (PJ2) to the panel is started by adjusting each frame and the color wheel rotation position (PJ2) to G. That is, in the image projection device (PJ2) 4000, the output to the panel 400 is delayed by one color from the image projection device (PJ1) 1000 in the detection timing of the color wheel rotation position. Regarding the output delay of the image projection device (PJ3) 5000, the output of the display data of the image projection device (PJ1) 1000 to the panel 400 (representing the panel drive data in FIG. 2) is output to each frame and the color wheel rotation position (PJ1). ) Is started according to R.

On the other hand, the output of the display data of the image projection device (PJ3) 5000 to the panel 400 is started by adjusting each frame and the color wheel rotation position (PJ3) 5000 to B. That is, the image projection device (PJ3) lags the image projection device (PJ1) by two colors at the detection timing of the color wheel rotation position in the output to the panel 400.

In the present embodiment, the replacement of the output order of the panel drive data of the image projection device (PJ2) 4000 and the image projection device (PJ3) 5000 is set as follows. The image projection device (PJ1) 1000 outputs display data to the panel 400 in the order of R → G → B, while the image projection device (PJ2) 4000 outputs G → B → R and the image projection device (PJ3) 5000. The display data is output to the panel 400 in the order of B → R → G.

As a specific replacement method, when the control unit 30 saves the display data in the RAM 213 in response to an instruction from the operation unit (operation means) 10 or the communication unit (communication means) 20, the order of the display data is changed. save. For example, when the data in the Nth frame is output to the panel 400, the order of the display data in the N + 1th frame is changed and the data is stored in the RAM 213. Subsequently, in the next frame, while the display data of the N + 1th frame is output to the panel, the order of the display data of the N + 2nd frame is changed and stored in the RAM 213. The synchronization between the image projection devices is performed by connecting the same image data output device to each image projection device and using the synchronization signal of the image data output device.

Next, with reference to FIG. 6, the configuration of the image projection system 1 when the operation unit 10 of each image projection device constituting the image projection system 1 in the present embodiment is operated to set the mode will be described. FIG. 6 is a configuration diagram of the image projection system 1 when the image projection system 1 is operated to set the mode.

The image projection system 1 includes three image projection devices: an image projection device (PJ1) 1000, an image projection device (PJ2) 4000, and an image projection device (PJ3) 5000. An image data output device 3000 is connected to each image data input unit 101 of the image projection devices 1000, 4000, and 5000. Further, the image projection devices 1000, 4000 and 5000 project an image on a common projection surface 2000. In the present embodiment, the number of image projection devices constituting the image projection system 1 is not limited to three, and if a plurality of image projection devices are provided, the number is two or four or more. May be good.

Next, a method of operating the image projection system 1 to set a mode will be described with reference to FIG. 7. FIG. 7 is a flowchart when the image projection system 1 is operated to set the mode.

First, in step S1, the image projection device (PJ1) 1000 determines whether or not there are a plurality of image projection devices constituting the image projection system 1. If there are a plurality of image projection devices, the process proceeds to step S2. On the other hand, if there are no multiple image projection devices, this flow ends.

In step S2, whether or not the image projection device (PJ1) 1000 is selected by the user to stack and use a plurality of image projection devices, that is, via the operation unit 10 of the image projection device (PJ1) 1000. Determines if the user has chosen to use the stack. If stack use is not selected by the operation unit 10 of the image projection device (PJ1) 1000, this flow ends. On the other hand, when stack use is selected by the operation unit 10 of the image projection device (PJ1) 1000, the process proceeds to step S3. In step S3, the user sets the panel data output timing and the mode related to the output order to the first mode via the operation unit 10 of the image projection device (PJ1) 1000. For example, in the first mode, there is no output delay, and the output order of the panel drive data is R → G → B. Subsequently, in step S4, the image projection device (PJ1) 1000 drives the panel 400 in the first mode.

If stack use is selected by the operation unit 10 of the image projection device (PJ1) 1000 in step S2, the process proceeds to step S5. In step S5, the image projection device (PJ2) 4000 determines whether or not the user has selected to use the stack via the operation unit 10 of the image projection device (PJ2) 4000, as in step S2. If stack use is not selected by the operation unit 10 of the image projection device (PJ2) 4000, this flow ends. On the other hand, when stack use is selected by the operation unit 10 of the image projection device (PJ2) 4000, the process proceeds to step S6. In step S6, the user sets the panel data output timing and the mode related to the output order to the second mode via the operation unit 10 of the image projection device (PJ2) 4000. For example, in the second mode, the output delay is for one color of the detection timing of the color wheel rotation position, and the output order of the panel drive data is in the order of G → B → R. Subsequently, in step S7, the image projection device (PJ2) 4000 drives the panel 400 in the second mode.

If stack use is selected by the operation unit 10 of the image projection device (PJ2) 4000 in step S5, the process proceeds to step S8. In step S8, the image projection device (PJ3) 5000 determines whether or not the user has selected to use the stack via the operation unit 10 of the image projection device (PJ3) 5000, as in step S2. If stack use is not selected by the operation unit 10 of the image projection device (PJ3) 5000, this flow ends. On the other hand, when stack use is selected by the operation unit 10 of the image projection device (PJ3) 5000, the process proceeds to step S9. In step S9, the user sets the panel data output timing and the mode related to the output order to the third mode via the operation unit 10 of the image projection device (PJ3) 5000. For example, in the third mode, the output delay is for two colors of the detection timing of the color wheel rotation position, and the output order of the panel drive data is B → R → G. Subsequently, in step S10, the image projection device (PJ3) 5000 drives the panel 400 in the third mode. In this embodiment, the contents and combinations of the setting mode conditions and the number of image projection devices are not limited to the above.

Next, with reference to FIG. 8, the configuration of the image projection system 1 in the case of communicating between the image projection devices constituting the image projection system 1 in the present embodiment to set the mode will be described. FIG. 8 is a configuration diagram of an image projection system 1 when a mode is set by communication between image projection devices constituting the image projection system 1.

The image projection system 1 includes three image projection devices: an image projection device (PJ1) 1000, an image projection device (PJ2) 4000, and an image projection device (PJ3) 5000. An image data output device 3000 is connected to each image data input unit 101 of the image projection devices 1000, 4000, and 5000. The communication units 20 of the image projection devices 1000, 4000, and 5000 can communicate with each other by wire or wirelessly. Further, the image projection devices 1000, 4000 and 5000 project an image on a common projection surface 2000. In the present embodiment, the number of image projection devices constituting the image projection system 1 is not limited to three, and if a plurality of image projection devices are provided, the number is two or four or more. May be good.

Next, with reference to FIG. 9, a method of setting a mode by communication between a plurality of image projection devices constituting the image projection system 1 will be described. FIG. 9 is a flowchart when a mode is set by communication between image projection devices constituting the image projection system 1.

First, a plurality of image projection devices are connected in advance so as to be able to communicate with each other via the communication unit 20. The communication means is not limited to the wired connection, and may be a wireless connection. In step S11, the image projection device (PJ1) 1000 determines whether or not there are a plurality of image projection devices constituting the image projection system 1. If there are a plurality of image projection devices, the process proceeds to step S12. On the other hand, if there are no multiple image projection devices, this flow ends.

In step S12, the image projection device (PJ1) 1000 determines whether or not the user has selected to stack and use a plurality of image projection devices, that is, the user via the operation unit 10 of the image projection device (PJ1) 1000. Determines if you have chosen to use the stack. If stack use is not selected by the operation unit 10 of the image projection device (PJ1) 1000, this flow ends. On the other hand, when stack use is selected by the operation unit 10 of the image projection device (PJ1) 1000, the process proceeds to step S13.

In step S13, the image projection device (PJ1) 1000 allocates the panel data output timing of each of the plurality of image projection devices constituting the image projection system 1 and the mode setting regarding the output order. In step S14, the image projection device (PJ1) 1000 sets the mode of the image projection device (PJ1) to the first mode. In step S16, the image projection device (PJ1) 1000 sets the mode of the image projection device (PJ2) 4000 to the second mode. In step S18, the image projection device (PJ1) 1000 sets the mode of the image projection device (PJ3) 5000 to the third mode.

Subsequently, in step S15, the image projection device (PJ1) 1000 drives the panel 400 in the first mode. In step S17, the image projection device (PJ2) 4000 drives the panel 400 in the second mode. In step S19, the image projection device (PJ3) 5000 drives the panel 400 in the third mode. For example, in the first mode, there is no display delay, and the output order of the panel drive data is in the order of R → G → B. In the second mode, the display delay is for one color of the detection timing of the color wheel rotation position, and the output order of the panel drive data is in the order of G → B → R. In the third mode, the display delay is for two colors of the detection timing of the color wheel rotation position, and the output order of the panel drive data is B → R → G. The contents and combinations of the setting mode conditions and the number of image projection devices are not limited to the above.

As described above, the image projection device 1000 of the present embodiment can project an image using a plurality of image projection devices 1000, 4000, and 5000, and has an optical separation means (color wheel 70) and a light modulation element. It has (panel 400) and control means (control unit 30). The light separation means separates the light from the light source 80 into light having a plurality of different wavelength bands by time division. The light modulation element is driven according to the wavelength band of the light separated by the light separation means. The control means can switch the drive timing of the light modulation element. Further, the drive timing of the light modulation element is different from the drive timing of the light modulation element in at least one other image projection device (4000, 5000) constituting the plurality of image projection devices.

Preferably, the control means switches the drive timing of the light modulation element according to the mode. As an example, the modes include a first projection mode, a second projection mode, and a third projection mode. The first projection mode is a normal projection mode in which the image projection device is projected by itself. The second projection mode is a stack projection mode in which projection images of a plurality of image projection devices are superimposed and projected. The third projection mode is a multi-projection mode in which projection images of a plurality of image projection devices are arranged side by side to form an image. As another example, the mode includes a first drive mode, a second drive mode, and a third drive mode. The first drive mode is a mode in which an image projection device is used alone and an image is projected without switching the drive timing of the light modulation element. The second drive mode is a mode in which a plurality of image projection devices are used to superimpose and project light of a plurality of different wavelength bands at the same timing. The third drive mode is a mode in which a plurality of image projection devices are used and light of the same wavelength band is superimposed and projected at the same timing. The control means sets the light modulation element to the first drive mode when the first projection mode is selected, and sets the light modulation element to the second drive mode when the second projection mode is selected. You may.

Preferably, the image projection device has an operating means (operation unit 10). The control means sets the mode of the image projection device based on the operation of the operation means by the user. Further, preferably, the image projection device has a communication means (communication unit 20) that communicates with other image projection devices constituting the plurality of image projection devices. The control means sets the respective modes of the plurality of image projection devices via the communication means.

Preferably, the image projection device has a storage means (RAM 213) that stores at least one frame of display data output to the light modulation element. The control means changes the output timing of the display data output from the storage means to the light modulation element and the output order of the display data to switch the drive timing of the light modulation element.

Preferably, the image projection system 1 has a first image projection device (PJ1), a second image projection device (PJ2), and a third image projection device (PJ3). These image projection devices are connected to the image data output device 3000 and project the image based on the signal output from the image data output device. In the image projection system, at the same timing, the light of the first wavelength band (for example, R) from the first image projection device, the light of the second wavelength band (for example, G) from the second image projection device, and the second. The light of the third wavelength band (for example, B) is superimposed and projected from the image projection device of 3.

According to the present embodiment, it is possible to provide an image projection device and an image projection system capable of reducing image quality deterioration due to color break with a simple configuration when performing stack projection.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and modifications can be made within the scope of the gist thereof.

30 Control unit (control means)
70 color wheel (light separation means)
400 panel (light modulation element)
1000 image projection device (PJ1)

Claims (13)

An image projection device capable of projecting an image using a plurality of image projection devices.
An optical separation means that separates the light from the light source into light of multiple different wavelength bands by time division.
An optical modulation element driven according to the wavelength band of the light separated by the optical separation means, and
It has a control means capable of switching the drive timing of the light modulation element, and has.
An image projection device characterized in that the drive timing of the light modulation element is different from the drive timing of the light modulation element in at least one other image projection device constituting the plurality of image projection devices. The image projection device according to claim 1, wherein the control means switches the drive timing of the light modulation element according to a mode. The mode includes a first projection mode, a second projection mode, and a third projection mode.
The first projection mode is a normal projection mode in which the image projection device is projected by itself.
The second projection mode is a stack projection mode in which projection images of the plurality of image projection devices are superimposed and projected.
The image projection device according to claim 2, wherein the third projection mode is a multi-projection mode in which projection images of the plurality of image projection devices are arranged to form an image. The mode includes a first drive mode, a second drive mode, and a third drive mode.
The first drive mode is a mode in which the image projection device is used alone and the image is projected without switching the drive timing of the light modulation element.
The second drive mode is a mode in which the plurality of image projection devices are used to superimpose and project light of the plurality of different wavelength bands at the same timing.
The image projection device according to claim 2, wherein the third drive mode is a mode in which the plurality of image projection devices are used to superimpose and project light having the same wavelength band on each other at the same timing. The mode includes a first drive mode and a second drive mode.
The first drive mode is a mode in which the image projection device is used alone and the image is projected without switching the drive timing of the light modulation element.
The second drive mode is a mode in which the plurality of image projection devices are used to superimpose and project light of the plurality of different wavelength bands at the same timing.
The control means is
When the first projection mode is selected, the light modulation element is set to the first drive mode.
The image projection apparatus according to claim 3, wherein when the second projection mode is selected, the light modulation element is set to the second drive mode. Has more operating means,
The image projection device according to any one of claims 1 to 5, wherein the control means sets a mode of the image projection device based on the operation of the operation means by the user. Further having a communication means for communicating with other image projection devices constituting the plurality of image projection devices.
The image projection device according to any one of claims 1 to 5, wherein the control means sets each mode of the plurality of image projection devices via the communication means. Further, it has a storage means for storing at least one frame of display data output to the light modulation element.
The control means is characterized in that the output timing of the display data output from the storage means to the light modulation element and the output order of the display data are changed to switch the drive timing of the light modulation element. The image projection device according to any one of claims 1 to 7. The image projection device according to claim 8, wherein the control means reorders and stores the display data according to the mode of the image projection device. The image projection device according to any one of claims 1 to 9, wherein the light modulation element is a panel whose display can be switched at once. The image projection device according to any one of claims 1 to 10, wherein the light separation means is a color wheel having three colors of R, G, and B. An image projection system that can project images using multiple image projection devices.
The plurality of image projection devices are connected to the image data output device, and the image is projected based on the signal output from the image data output device.
The image projection system according to any one of claims 1 to 11, wherein at least one of the plurality of image projection devices is the image projection device. The plurality of image projection devices include a first image projection device, a second image projection device, and a third image projection device.
In the image projection system, at the same timing, the light in the first wavelength band from the first image projection device, the light in the second wavelength band from the second image projection device, and the third image projection. The image projection system according to claim 12, wherein the device superimposes and projects light in a third wavelength band.

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