JPWO2018011942A1 - Projector and projector control method - Google Patents

Abstract

  In a projector 1 that includes a plurality of projection lenses 125 to 128 and projects an image, light sources 101 to 103, an optical modulator 113 that modulates light generated from the light source with a video signal, and a plurality of projections of the modulated video light A plurality of optical paths 114 to 119 leading to the lenses 125 to 128 and an optical path switching unit (control device 100) that selects and switches the optical paths from the plurality of optical paths to the predetermined projection lens are provided. The optical path switching unit 100 switches the optical path in a time-sharing manner according to the timing at which the optical modulator 113 modulates, and sequentially projects the modulated video light from the plurality of projection units 125 to 128.

Description

  The present invention relates to a projector and a projector control method.

  Research and practical application of a technique for expressing images using a plurality of projectors are in progress. Examples of the corresponding device include projection mapping, multi-projection, and multi-view type projection.

  As a technique related to this, Patent Document 1 discloses a method for presenting a three-dimensional image on a table as follows: “A plurality of projectors are arranged on a circumference around the axis of a light controller. A light ray group composed of a plurality of light rays is emitted toward the outer peripheral surface of the light source, thereby forming a set of virtual point light sources on the table, so that a stereoscopic image is presented on the table. Is described. Patent Document 2 discloses a high-resolution and high-brightness image that cannot be realized by a single projector by arranging partial images projected from a plurality of projectors on a screen that is a projection surface to form one whole image. A multi-projection system that can be generated is described.

JP 2013-210591 A JP 2011-217303 A

  However, in a system that configures a single image using a large number of projectors, the failure rate is high, the maintenance of individual projectors is difficult, the power consumption increases by the number of units, the arrangement adjustment of individual projectors and each There are problems such as an increase in the scale of the apparatus for synchronizing the projector.

  The above problems are solved by the technology described in the claims. For example, in a projector that projects a video with a plurality of projection units, a light source, a light modulation unit that modulates light generated from the light source with a video signal, and the plurality of projections of the modulated video light A plurality of optical paths that lead to the optical path, and an optical path switching unit that selects and switches an optical path from the plurality of optical paths to the predetermined projection unit, the optical path switching unit according to a modulation operation or a modulation timing of the light modulation unit The optical path is switched in a time-sharing manner, and the modulated image light is sequentially projected from the plurality of projection units.

  According to the present invention, it is possible to project an image from a plurality of different positions with one projector having a common light source and a light modulation unit. Therefore, projection mapping, multi-projection, multi-view type projection, and the like can be realized or configured with a relatively small number of projectors.

1 is a diagram illustrating an optical configuration of a projector according to Embodiment 1. FIG. Explanatory drawing in the case of projecting an image | video from the projection lens 125. FIG. Explanatory drawing in the case of projecting an image from the projection lens 128. The figure which shows the relationship between the output polarization state of a variable polarization part, and the projection lens which radiate | emits. The figure explaining the color shift which generate | occur | produces when using a prism. FIG. 5 is a diagram for explaining a method for correcting a color shift of a display image. The figure explaining the emission order of a some projection lens. FIG. 6 is a diagram illustrating an optical configuration of a projector according to a second embodiment. The figure which shows the relationship between the output polarization state of a variable polarization part, and the projection lens which radiate | emits. FIG. 10 is a diagram illustrating a projector and a projected image thereof in Embodiment 3. FIG. 6 is a diagram for explaining a correction amount ΔS in the first embodiment.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram illustrating an optical configuration of the projector according to the first embodiment. First, the overall configuration will be described. Video information is input from the external device 2 to the projector 1 and sent to the control device 100. The control device 100 controls a plurality of light sources 101, 102, 103, a light modulator (SLM: Spatial light modulator) 113, and a plurality of variable polarization units 114, 116, 118 in accordance with input video information. The inputted video is projected from a plurality of projection lenses 125, 126, 127, 128 arranged at different positions. Each of the projection lenses 125 to 128 is actually provided with a plurality of lens elements, but is shown as one lens in the drawing for simplification of illustration. In addition, the control device 100 transmits the display state on the screen and the operation state of the projector 1 to the external device 2.

  The plurality of light sources 101, 102, and 103 are, for example, LED light sources or laser light sources, and generate red, green, and blue light, respectively. Each of the light sources 101 to 103 adjusts the amount of light and starts / stops light emission according to a control signal from the control device 100. The plurality of collimating lenses 104, 105, and 106 converts light from each light source into parallel light. The dichroic mirrors 107, 108, and 109 reflect only red, green, and blue light from the light sources 101, 102, and 103, respectively. Polarizing beam splitters (PBS) 111, 115, 117, and 119 allow P-polarized light to pass therethrough and reflect S-polarized light in the PBS (bends by 90 degrees). The quarter wave plate 112 is an element that changes the phase of incident light by π / 2.

  The light modulator (SLM) 113 performs light modulation of the image light by reflecting incident light or changing the phase for each pixel in the SLM plane according to the image signal from the control device 100. In this embodiment, as the light modulator (SLM) 113, for example, a reflective liquid crystal element (LCOS) and a digital micromirror device (DMD: Digital mirror device) including a plurality of minute reflecting mirrors are used. The plurality of variable polarization units 114, 116, and 118 switch the polarization direction of incident light according to a control signal from the control device 100. The plurality of prisms 121, 122, 123, and 124 change the traveling direction of incident light and guide the projection light to the projection lenses 125, 126, 127, and 128, respectively. The plurality of projection lenses 125 to 128 adjust the focus of the incident image light in accordance with the distance to the screen and project it onto a screen (not shown).

  Here, the plurality of projection lenses 125 to 128 are arranged in a substantially arc shape with their projection optical axes facing different directions. Specifically, the direction of the projection optical axis is different between adjacent projection lenses by the same angle, and the image emitted from each projection lens is formed at substantially the same position. The plurality of prisms 121 to 124 change the traveling direction of the incident image light in the direction of the projection optical axis of the corresponding projection lens.

Next, the projection operation of the projector 1 of this embodiment will be described with reference to FIGS.
FIG. 2 shows an example of the projection operation (optical operation) according to the present embodiment. The optical path when the red light 150 generated from the light source 101 is modulated and projected from the projection lens 125 is indicated by a broken line. Show.

  The red light 150 generated from the light source 101 becomes parallel light by the collimating lens 104, is reflected by the dichroic mirror 107, passes through the dichroic mirrors 108 and 109, and enters the PBS 111 as P-polarized light. The P-polarized light that has entered the PBS 111 travels straight, passes through the quarter-wave plate 112, and enters the SLM 113.

  The SLM 113 performs reflection light modulation on the incident light according to the video signal from the control device 100. The modulated light reflected by the SLM 113 passes through the quarter-wave plate 112 again and is converted to S-polarized light. The modulated light having the S polarization is reflected by the PBS 111 and enters the variable polarization unit 114.

  The variable polarization unit 114 switches the polarization direction of light by the control device 100, and converts incident S-polarized modulated light into P-polarized light. The P-polarized modulated light travels straight through the PBS 115 and enters the prism 121. In the prism 121, the light traveling direction is bent by the angle of the prism. Thereafter, the projection lens 125 projects the image after adjusting the focus on the screen. As described above, the red light image can be projected from the desired projection lens 125 by modulating the red light and switching the polarization direction by the light source 101, the SLM 113, and the variable polarization unit 114.

  Also, the green light generated from the light source 102 can be projected from the projection lens 125 after proceeding in the same manner as the red light 150 from the light source 101 after being collimated by the collimating lens 105 and reflected by the dichroic mirror 108. . Also, the blue light generated by the light source 103 is converted into parallel light by the collimating lens 106 and reflected by the dichroic mirror 109, and then proceeds in the same manner as the red light 150 from the light source 101 and can be projected from the projection lens 125. . The red, green, and blue light emitted from the above three light sources 101, 102, and 103 is light-modulated into an image corresponding to each color in a time division manner by the SLM 113, thereby projecting a color image from the projection lens 125. can do.

  FIG. 3 shows a case where the red light 150 generated from the light source 101 is modulated and the light path is switched to project from the projection lens 128. The optical path of the light 150 from the light source 101 to the variable polarization unit 114 is the same as that in FIG.

  S-polarized modulated light is incident on the variable polarization section 114. The variable polarization unit 114 allows the incident polarization direction (S-polarized light) to pass through the polarization operation signal from the control device 100 without changing it. The S-polarized modulated light that has passed through the variable polarization unit 114 is reflected by the PBS 115 and enters the next variable polarization unit 116.

  The variable polarization unit 116 converts the incident S-polarized modulated light into P-polarized light according to the polarization operation signal from the control device 100. The P-polarized modulated light goes straight through the PSB 117 and enters the next variable polarization unit 118.

  The variable polarization unit 118 makes the light travel straight without changing the polarization direction (P-polarized light) of the incident modulated light according to the polarization operation signal from the control device 100 and makes it incident on the PBS 119. The P-polarized modulated light that has entered the PBS 119 travels straight through, changes its optical path by the mirror 120 (bends 90 degrees), and enters the prism 124. The prism 124 bends the light traveling direction by the prism angle. Thereafter, the focus is adjusted from the projection lens 128 onto the screen and a red light image is projected.

  The green light generated from the light source 102 and the blue light generated from the light source 103 are similarly projected from the projection lens 128. A color image can be projected from the projection lens 128 by modulating each color light by the SLM 113 in a time division manner.

  The same applies to the other projection lenses 126 and 127, and a color image can be emitted from a desired projection lens by appropriately switching the polarization directions of the variable polarization portions 114, 116, and 118.

  As described above, the optical path can be switched by controlling the polarization directions of the variable polarization sections 114, 116, and 118, and an image can be projected from a desired projection lens at an arbitrary timing.

  FIG. 4 is a diagram illustrating the relationship between the output polarization state of the variable polarization unit and the projection lens that emits light. The polarization direction of the light in the variable polarization units 114, 116, and 118 is switched and controlled by a control signal from the control device 100. For example, when the light is emitted from the projection lens 126, the output polarization of the variable polarization unit 114 and the variable polarization unit 116 may be switched to S polarization as illustrated. When the light is emitted from the projection lens 127, the output polarization of the variable polarization unit 116 may be switched to P polarization, and the output polarization of the variable polarization unit 114 and the variable polarization unit 118 may be switched to S polarization. That is, the control device 100 according to the present embodiment controls the output polarization of each variable polarization unit as shown in FIG. 4 according to the timing of emitting light from each projection lens or the position of the projection lens that emits light. The control signal is output.

  Thus, by selecting the optical path of the projection light by the variable polarization unit, it is possible to project an image from a desired projection lens. More specifically, the optical path is switched by the variable polarization unit in time-sharing with the desired projection lens in time-division by matching the timing with the modulation time (1/1500 sec) of the projection video (for example, 1500 frame / sec) that changes at high speed. Images can be emitted sequentially. The order in which the images are emitted may be, for example, the order of adjacent projection lenses (order of 125 → 126 → 127 → 128 → 125...) Or other order. The order in which the images are emitted may be determined in advance, and the optical path of the projection light may be sequentially switched by the control device 100 in accordance with this order.

  Here, the images from the projection lenses may be the same image or different images. For example, when the present embodiment is applied to an apparatus that performs stereoscopic display, a stereoscopic image of a certain object is prepared in the control apparatus 100. When projecting an image from the projection lens 125, the image reflected or output from the object at an angle A is displayed on the SLM 113, and then when projecting an image from the projection lens 126, Δα from the angle A When the image of the object reflected or output to the angle B shifted from the angle is displayed on the SLM 113 and then projected from the projection lens 127, the image is reflected or reflected from the angle B to the angle C further shifted by the Δα angle. The image of the object being output is displayed on the SLM 113. In this way, for example, a stereoscopic image corresponding to the object can be projected and displayed on a screen 500 shown in FIG.

  According to the present embodiment, a single projector having a common light source and an optical modulator can project an image in a time division manner from a plurality of projection lenses at different positions. Therefore, it is not necessary to prepare a large number of projectors, and there are effects such as a reduction in failure rate, ease of maintenance, reduction in power consumption, and reduction in the scale of the apparatus.

  Next, color misregistration correction and flicker countermeasures in a projector having a plurality of projection lenses will be described. First, color misregistration correction will be described with reference to FIGS. 5A and 5B.

  FIG. 5A is a diagram illustrating color misregistration that occurs when a prism is used. When the light traveling direction is changed using refraction of a prism or the like, images of the respective colors are separated on the projection surface from the difference in refractive index (chromatic aberration) depending on the wavelength. For example, in the case of a display image 400 composed of two colors a and b, if the light traveling direction is changed by the prism 124, it is affected by the difference in refractive index depending on the wavelength. As a result, on the screen 500, as shown in the display image 401 (color a) and the display image 402 (color b), it is displayed as an image separated for each color.

  FIG. 5B is a diagram illustrating a method for correcting color misregistration of a display image according to the present embodiment. As a display image incident on the prism 124, for example, a display image 403 of color a and a display image 404 of color b, which are constituent components thereof, are incident with a position shifted by ΔS in advance. Specifically, the SLM 113 modulates the color a signal and the color b signal constituting the display image by shifting them by ΔS. For example, as shown in FIG. 10, a display area 113B on the SLM 113 that displays a red or blue image is displayed in a predetermined number of pixels (for example, left or right) with respect to the display area 113G on the SLM 113 that displays a green image. (Several to several tens of pixels). This predetermined number of pixels is ΔS, which is a shift amount between display areas on the SLM 113 that displays video of each color. This shift amount (correction amount) ΔS depends on the difference in refractive index between the wavelengths of the two colors a and b at the prism 124. As a result, an image without color separation is displayed on the screen 500, such as the display image 405.

  The color misregistration amount of the display image is determined by the difference in refractive index between wavelengths of each color (RGB) light and the distance to the screen 500. Therefore, from the distance between the projection lens and the screen 500, the correction amount ΔS for each projection lens and optical path corresponding to the video signal of each color can be obtained. This correction amount ΔS is stored in the control device 100 in advance. When the video signal is projected, the control device 100 outputs the video signal of each color and the correction amount ΔS corresponding to each optical path to the SLM 113 when the video signal of each color is output to the SLM 113, and is emitted from each projection lens. Image color misregistration can be corrected in a time-sharing manner. If the distance between each projection lens and the SLM 113 is different, the optical distance between each projection lens and the SLM 113 may be made equal by using a relay lens or the like as appropriate, or the optical design of each projection lens may be changed.

  Furthermore, in addition to the above-described color misregistration correction, light amount correction information corresponding to each projection lens (optical path) may be stored in the control device 100 in order to make the amount of light emitted from each projection lens uniform. This light amount correction information is, for example, the amount of light supplied or guided to a projection lens (for example, 128) having a long optical path through many optical elements (variable polarization section, PBS, etc.), and the optical path is short through an optical element smaller than this. Information for increasing the amount of light supplied or guided to the projection lens (for example, 125) is included. Therefore, the light amount correction information includes information for correcting the light amounts in the order of the projection lenses 128, 127, 126, and 125 in order. A control signal generated based on the light amount correction information is input from the control device 100 to the SLM 113. Then, the SLM 113 can equalize the light quantity of the image emitted from each projection lens by correcting the degree of light modulation for each projection lens based on this control signal.

Next, flicker countermeasures when using a plurality of projection lenses will be described with reference to FIG.
FIG. 6 is a diagram illustrating the emission order of a plurality of projection lenses. Here, the projector 1 includes twelve projection lenses 130 (reference characters A to L), and projects an image 410 onto the screen 500. The optical axis of each projection lens 130 is configured to be aligned in the direction of the user's viewpoint 510. The projection image generated by the light modulator (SLM) 113 is sequentially emitted from the plurality of projection lenses 130 by switching the optical path in a time division manner. The emission order of each projection lens at that time will be described.

  If the image 410 is a moving image, the SLM 113 performs, for example, 1500 light modulations per second, and the modulated images are moved at high speed in the order of A → B → C... → L (1/1500 sec). The light path is switched to and emitted. When the emission from the projection lens L is completed, the projection lens A is returned to the projection lens A and switched in the same order as described above. However, when the number of projection lenses increases, an image is emitted from each projection lens in a time-sharing manner, so that a blink phenomenon (flicker) of the image 410 viewed from the viewpoint 510 occurs.

  As a countermeasure, the projection lenses are not switched continuously but at a predetermined interval (n projection lenses). That is, the projection lenses are switched while skipping n projection lenses. For example, if the number of skips of the projection lens is n = 1, the switching is performed in the order of A → C → E → G → I → K, followed by B → D → F → H → J → L. Thereby, the flicker described above can be reduced. Note that the projection lens skip number n may be set as appropriate according to the number of projection lenses mounted on the projector.

  In this embodiment, the SLM 113 is used as an element for modulating the intensity of reflected light. However, the present invention is not limited to this, and an optical modulation element such as a transmissive liquid crystal element can also be used. As the variable polarization section, for example, a liquid crystal variable retarder may be used, or a combination of a polarizing plate and a rotation mechanism may be used. In addition, any element that can arbitrarily change the polarization direction of light can be used. In this embodiment, the switching of the optical path is realized by combining the variable polarization unit and the PBS. However, the optical path may be switched using a movable mirror such as a galvano mirror. In the present embodiment, the configuration is such that one color SLM is used to switch three colors of video in a time-sharing manner, but a configuration in which a plurality of SLMs are mounted in a projector and a multicolor video is projected by one irradiation may be adopted. As a light source, it is naturally possible to use a white light source (LED, metal halide lamp, etc.) instead of a light source that emits each color of RGB.

  Example 2 is a case where the projector is configured such that the number of optical elements through which the projection light passes is equal in any projection lens.

  FIG. 7 is a diagram illustrating an optical configuration of the projector according to the second embodiment. Here, only portions different from the first embodiment (FIG. 1) will be described. Each of the plurality of variable polarization units 200, 203, and 204 switches the polarization direction of incident light according to a control signal from the control device 100. Polarization beam splitters (PBS) 201, 205, and 207 pass P-polarized light and reflect S-polarized light within the PBS. In addition, mirrors 202, 206, and 208 are provided. Also in this configuration, a color image can be emitted from the desired projection lenses 125 to 128 by appropriately switching the polarization directions of the variable polarization units 200, 203, and 204. However, in this embodiment, the number of optical elements through which the projection light passes is constant regardless of which projection lens emits an image.

  FIG. 8 is a diagram illustrating the relationship between the output polarization state of the variable polarization unit and the projection lens that emits light. Hereinafter, how the optical path is switched to emit an image from each projection lens will be described.

  The image light modulated by the SLM 113 is reflected by the PBS 111 and enters the variable polarization unit 200. When the output of the variable polarization unit 200 is P-polarized light, the image light passes through the PBS 201 and enters the variable polarization unit 203. Further, when the output of the variable polarization unit 203 is P-polarized light, the image is emitted from the projection lens 125 after passing through the PBS 205 and entering the prism 121 and changing the traveling direction. On the other hand, when the output of the variable polarization unit 203 is S-polarized light, the PSB 205 is reflected, reflected again by the mirror 206, the traveling direction is changed by the prism 122, and then an image is projected from the projection lens 126.

  When the output of the variable polarization unit 200 is S-polarized light, the image light is reflected by the PBS 201 and reflected again by the mirror 202 and then enters the variable polarization unit 204. Further, when the output of the variable polarization unit 204 is P-polarized light, the image is projected from the projection lens 127 after passing through the PBS 207 and changing the traveling direction by the prism 123. On the other hand, when the output of the variable polarization unit 204 is S-polarized light, the image is projected from the projection lens 128 after the PBS 207 is reflected and reflected again by the mirror 208 and the traveling direction is changed by the prism 124.

  In the configuration of the second embodiment, the number of variable polarization units and PBSs through which the light to be projected passes is equal in any projection lens. That is, the number of optical elements (excluding the mirrors 202, 206, and 208) that pass from the variable polarization unit 200 to each of the projection lenses 125 to 128 is six in any optical path. Incidentally, in the case of the first embodiment (FIGS. 1 to 3), the number of optical elements that pass from the variable polarization section 114 to the projection lens 125 is four, the number of the optical elements up to the projection lens 126 is six, and the projection lens 127 and the projection lens. Up to 128, there are 8 such as different. For this reason, a phenomenon occurs in which the amount of light decreases as the projection lens has an optical path that passes through many optical elements.

  On the other hand, according to the second embodiment, the decrease in the amount of light caused by passing through the optical element is almost constant in any optical path. As a result, there is an advantage that the necessity of varying the light amount correction amount for each projection lens is reduced. Further, image light does not enter the variable polarization unit 203 and the variable polarization unit 204 at the same time. Therefore, since it is allowed to control the variable polarization unit 203 and the variable polarization unit 204 with a common signal, the number of control signals can be reduced.

In the third embodiment, the case of projecting on a large screen by a plurality of projection lenses will be described.
FIG. 9 is a diagram illustrating a projector and a projected image thereof according to the third embodiment. In the projector 1, two projection lenses 125 and 126 are arranged with a distance L apart. The projection range of each projection lens 125, 126 has a spread of the projection angle φ, and each projection direction (center axis direction) is arranged to be separated by an angle θ. At this time, overlapping portions 303 are formed on the image projection surfaces 301 and 302 on the screen by the projection lenses 125 and 126.

When the distance from the projection lenses 125 and 126 to the screen is x, the ratio R of the overlap amount y to the projection surface size is:
R = {xtan (φ−θ) −L} / 2xtan (φ / 2) (1)
Is required.

  At this time, in the present embodiment, a process (blend process) for partially darkening the projected image according to the projection distance of the projection lenses 125 and 126 is performed in the overlapping portion 303 of the two video projection surfaces 301 and 302. That is, in the SLM 113, the amount of modulation with respect to the video signal is reduced in the overlapping portion 303. Specifically, the blend process is performed by an amount that is half of the ratio R described above, and an image is projected so that the display images on the projection surfaces 301 and 302 are connected at that position. As a result, the resolution of the projected image is improved to 2-R when the resolution of one projection lens is 1, and the image has almost twice the number of pixels that can be expressed by one projection lens. Can be projected.

  The control device 100 calculates and stores the overlapping portion 303 of the image of each projection lens from the projection distance x, the projection angle φ, the angle difference θ between the projection lenses, the projection lens distance L, and the projection distance x. . The SLM 113 performs a blending process according to the overlapping portion. As a result, it is possible to project a video whose screen is simply expanded.

1: projector,
2: External equipment,
100: control device,
101-103: light source,
104-106: collimating lens,
107-109, 202, 206, 208: Dichroic mirror,
111, 115, 117, 119, 205, 207: polarization beam splitter (PBS),
112: 1/4 wavelength plate,
113: Light modulator (SLM)
114, 116, 118, 200, 203, 204: variable polarization section,
121-124: Prism,
125-128, 130: projection lens,
303: Overlapping portion of the projection surface,
400 to 405: display image,
500: Screen.

Claims (13)

In a projector that projects a video with a plurality of projection units,
A light source;
A light modulating unit that modulates light generated from the light source with a video signal;
A plurality of optical paths for guiding the modulated image light to the plurality of projection units;
An optical path switching unit that selects and switches an optical path from the plurality of optical paths to the predetermined projection unit;
The projector, wherein the optical path switching unit switches the optical path in a time-sharing manner according to the timing of modulation by the light modulation unit, and sequentially projects the modulated video light from the plurality of projection units. The projector according to claim 1, wherein
Each of the plurality of projection units includes a projection lens that projects image light and a prism that guides the image light to the projection lens,
The plurality of projection lenses are arranged in a substantially arc shape with different directions of the projection optical axis,
The plurality of prisms guide the modulated image light in a direction of a projection optical axis of the corresponding projection lens. The projector according to claim 2, wherein
The projector according to claim 1, wherein the plurality of projection lenses are arranged such that the direction of the projection optical axis is different by the same angle between adjacent projection lenses. The projector according to any one of claims 1 to 3,
The light modulation unit modulates a signal of each color component constituting the video signal by a predetermined amount in order to correct a color shift of the image projected from the projection unit, and
A projector that corrects the color misregistration for each of the plurality of corresponding projection units in accordance with the switching of the optical path. The projector according to any one of claims 1 to 4,
The projector, wherein the optical path switching unit switches the optical path so as to project video light in the order of the adjacent projection units. The projector according to any one of claims 1 to 4,
The projector is characterized in that the optical path switching unit switches an optical path so as to project video light while skipping a predetermined number of adjacent projection units. The projector according to any one of claims 1 to 3,
Each of the optical paths includes a variable polarization element and a polarization beam splitter that can switch a polarization direction by the optical path switching unit,
The projector according to claim 1, wherein the number of optical elements included in each optical path is the same in any optical path. The projector according to claim 7,
The optical path switching unit controls a plurality of variable polarization elements with a common signal. The projector according to any one of claims 1 to 3,
In the plurality of images projected on the screen from the plurality of projection units, comprising a calculation means for calculating an overlapping portion of adjacent images,
The projector according to claim 1, wherein the light modulation unit performs a blending process for reducing a modulation amount with respect to a video signal in the calculated overlapping portion. In a projector control method for projecting an image with a plurality of projection units,
A modulation step for modulating light generated from the light source with a video signal;
An optical path switching step of sequentially switching a plurality of optical paths for guiding the modulated image light to the plurality of projection units at a predetermined timing;
A projection step of sequentially projecting the modulated video light from the plurality of projection units;
A projector control method comprising: A projector control method according to claim 10, comprising:
In the modulation step,
In order to correct the color shift of the image projected from the projection unit, the signal of each color component constituting the video signal is shifted by a predetermined amount and modulated,
A projector control method, wherein the color misregistration correction amount is made different for each of the corresponding plurality of projection units in accordance with the switching of the optical path. A projector control method according to claim 10, comprising:
In the optical path switching step, the optical path is switched so as to sequentially project video light while skipping a predetermined number of adjacent projection units. A projector control method according to claim 10, comprising:
In the plurality of images projected on the screen from the plurality of projection units, the calculation step of calculating the overlapping portion of the adjacent images,
In the modulation step, a blending process for reducing a modulation amount for a video signal in the calculated overlapping portion is performed.

Images