JP2013073076A - Projection type video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly adjust a quantity of light emitted from a light source device by reflecting variation of projection conditions which affect visibility of a projection image.SOLUTION: A projector 100 includes: a light source device 10; a light modulation element 40 for generating video light by modulating light emitted from the light source device 10 on the basis of an input video signal; a projection part 50 for projecting the video light generated by the light modulation element 40 on a projection surface; an imaging part 500 for imaging the projection surface to generate a picked-up image; projection condition estimation means for estimating projection conditions for specifying at least a display size of an image projected by the projection part 50 on the basis of the picked-up image; and light quantity adjustment means for adjusting quantity of light emitted from the light source device so that the projected image has a predetermined brightness in response to the projection conditions estimated by the projection condition estimation means.

Description

  The present invention relates to a projection display apparatus, and more specifically to a projection display apparatus having a function of adjusting the brightness of a projection image.

  As this type of projection display apparatus (hereinafter referred to as a projector), for example, Japanese Patent Application Laid-Open No. 2003-131323 (Patent Document 1) uses a zoom lens having a zoom mechanism as a projection lens, and the focus of the zoom lens. A projector that adjusts the brightness of a light source lamp in conjunction with the distance is disclosed.

JP 2003-131323 A

  In the projector described in Patent Document 1, when the size of the projection image is reduced by the zoom mechanism, the light emission output of the light source is automatically reduced to prevent the visibility from being lowered due to the projection image being too bright. .

  However, the size of the projected image varies not only with the zoom state of the projection lens but also with the projection distance that is the distance from the projector to the projection plane. Therefore, the brightness of the projected image changes according to the projection distance. In the above-mentioned Patent Document 1, it is impossible to cope with a change in the brightness of the projected image due to the projection distance. Therefore, when the installation location of the projector is changed, it becomes difficult to adjust the projected image to the optimum brightness. .

  In addition, the visibility of the projected image, such as brightness and contrast, varies depending on the installation environment of the projector, the state of the projection surface, etc., in addition to the size of the projected image. Further, in a projector configured to be capable of three-dimensional display, the relationship between the amount of light emitted from the light source device and the brightness of the projected image differs between two-dimensional display and three-dimensional display. Therefore, if the light quantity of the light source device is not adjusted by reflecting these elements, the visibility of the projected image may be reduced.

  Therefore, the present invention has been made to solve such a problem, and its purpose is to appropriately adjust the amount of light emitted from the light source device, reflecting changes in projection conditions that affect the visibility of the projected image. It is to be.

  According to an aspect of the present invention, a projection display apparatus includes: a light source device; a light modulation element that generates light by modulating light emitted from the light source device based on an input video signal; A projection unit that projects the image light generated by the modulation element onto the projection plane, an imaging unit that captures the projection plane and generates a captured image, and at least a display size of an image projected by the projection unit based on the captured image. A projection condition estimating unit for estimating a projection condition to be specified, and an amount of light emitted from the light source device is adjusted so that the projected image has a predetermined brightness according to the projection condition estimated by the projection condition estimating unit. Light amount adjusting means.

  Preferably, the projection display apparatus is configured to be able to switch between two-dimensional display and three-dimensional display. The projection unit projects the first video light based on the video signal for the left eye and the second video light based on the video signal for the right eye in a time division manner so as to realize a three-dimensional display on the projection surface. Composed. The projection condition estimation means includes a brightness reduction rate estimation means for estimating a brightness reduction rate that is a ratio of reducing the brightness of the projection image in the three-dimensional display with respect to the brightness of the projection image in the two-dimensional display. . The light amount adjusting unit adjusts the emitted light amount of the light source device according to the projection condition and the luminance reduction rate estimated by the projection condition estimating unit.

  Preferably, the projection condition estimating unit includes an ambient light luminance estimating unit for estimating the luminance of the ambient light. The light amount adjusting unit adjusts the emitted light amount of the light source device in accordance with the projection condition estimated by the projection condition estimating unit and the brightness of the ambient light.

  Preferably, the projection condition estimation unit includes a reflectance estimation unit for estimating the reflectance of the projection surface. The light amount adjusting unit adjusts the emitted light amount of the light source device according to the projection condition estimated by the projection condition estimating unit and the reflectance of the projection surface.

  Preferably, the projection unit is configured to be able to project image light at an arbitrary zoom magnification by adjusting a projection angle of view. The projection condition estimation means estimates the zoom magnification and the projection distance as projection conditions for designating the display size of the image projected by the projection unit.

  Preferably, the light amount adjusting means has a light amount adjustment coefficient calculated using at least the zoom magnification and the projection distance as parameters, and sets the light amount adjustment coefficient according to the estimated zoom magnification and projection distance.

  According to the present invention, the visibility of the projected image due to the change in the projection condition is impaired by appropriately controlling the amount of light emitted from the light source device by reflecting the change in the projection condition that affects the visibility of the projected image. Can be avoided.

It is a figure which shows the external appearance structure of the projector which concerns on Embodiment 1 of this invention. It is a perspective view for demonstrating the internal structure of a main body cabinet. It is a figure explaining the control structure of the projector which concerns on this Embodiment 1. FIG. It is the flowchart which showed the control processing procedure for implement | achieving the light quantity adjustment process in the projector which concerns on Embodiment 1 of this invention. It is a figure which shows an example of a test pattern. It is a figure which shows the other example of a test pattern. It is a flowchart explaining the process of step S03 of FIG. It is a figure explaining the detection of the feature point of a test pattern by a projection condition estimation part. It is a figure explaining the detection of the feature point of a test pattern by a projection condition estimation part. It is a conceptual diagram explaining the estimation of the zoom state by a projection condition estimation unit. It is a conceptual diagram explaining the estimation of the projection distance by a projection condition estimation part. It is a flowchart explaining the process of step S06 of FIG. It is the flowchart which showed the control processing procedure for implement | achieving light quantity adjustment in the projector which concerns on Embodiment 2 of this invention. It is a flowchart explaining the process of step S072 of FIG. It is a figure explaining the relationship between a projection surface and the light quantity adjustment coefficient Kr. It is the flowchart which showed the control processing procedure for implement | achieving light quantity adjustment in the projector which concerns on Embodiment 3 of this invention. It is a conceptual diagram explaining one form of the projector which can perform a three-dimensional display. It is the flowchart which showed the control processing procedure for implement | achieving light quantity adjustment in the projector which concerns on Embodiment 4 of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the same or corresponding parts in the drawings are denoted by the same reference numerals and description thereof will not be repeated.

[Embodiment 1]
FIG. 1 is a diagram showing an external configuration of a projector according to Embodiment 1 of the present invention. In the present embodiment, for the sake of convenience, the direction with the projection surface viewed from the projector 100 is forward, the direction opposite to the projection surface is behind, the right direction when viewed from the projector 100 from the projection surface is right, and the projector 100 is viewed from the projection surface. The left direction is defined as the left, the direction perpendicular to the front / rear / left / right direction, the direction from the projector 100 toward the projection plane is defined as the bottom, and the opposite direction is defined as the top. The left-right direction is defined as the X direction, the front-rear direction is defined as the Y direction, and the up-down direction is defined as the Z direction.

  Referring to FIG. 1, a projector 100 is a so-called short focus projection type projector, and includes a substantially rectangular main body cabinet 200 and an imaging unit 500.

  The main body cabinet 200 is provided with a projection port 210 for transmitting image light. The image light emitted obliquely downward and forward from the projection port 210 is enlarged and projected onto a projection surface arranged in front of the projector 100. In the present embodiment, the projection surface is provided on the floor surface on which projector 100 is placed. When projector 100 is installed so that the rear surface of main body cabinet 200 is in contact with the floor surface, the projection surface can be provided on the wall surface.

  The imaging unit 500 is installed on the upper surface side of the main body cabinet 200. The imaging unit 500 includes an imaging element such as a CCD (Charge Couple Device) sensor or a CMOS (Completely Metal Oxide Semiconductor) sensor and an optical lens disposed in front of the imaging element. The imaging unit 500 captures an area including at least a range (hereinafter also referred to as a “projection area”) 410 in which the projector 100 can project image light. The imaging unit 500 generates image data indicating the captured image (hereinafter referred to as “imaging data”). The imaging unit 500 may be provided in the main body cabinet 200 as shown in FIG. 1 or may be built in the main body cabinet 200.

FIG. 2 is a perspective view for explaining the internal configuration of the main body cabinet 200.
Referring to FIG. 2, main body cabinet 200 includes light source device 10, cross dichroic mirror 20, folding mirror 30, DMD (Digital Micromirror Device) 40, and projection unit 50.

  The light source device 10 includes a plurality of (for example, three) light sources 10R, 10G, and 10B. The light source 10R is a red light source that emits light in the red wavelength range (hereinafter referred to as “R light”), and is composed of, for example, a red LED (Light Emitting Device) or a red LD (Laser Diode). The light source 10R is provided with a cooling unit 400R (not shown) including a heat sink and a heat pipe for releasing the heat generated by the light source 10R.

  The light source 10G is a green light source that emits light in a green wavelength range (hereinafter referred to as “G light”), and includes, for example, a green LED and a green LD. The light source 10G is provided with a cooling unit 400G including a heat sink 410G and a heat pipe 420G for releasing heat generated by the light source 10G.

  The light source 10B is a blue light source that emits light in a blue wavelength range (hereinafter referred to as “B light”), and includes, for example, a blue LED or a blue LD. The light source 10B is provided with a cooling unit 400B including a heat sink 410B and a heat pipe 420B for releasing heat generated by the light source 10B.

  The cross dichroic mirror 20 transmits only the B light out of the light incident from the light source 10 and reflects the R light and the G light. The B light transmitted through the cross dichroic mirror 20 and the R light and G light reflected by the cross dichroic mirror 20 are guided to the folding mirror 30, where they are reflected, and enter the DMD 40.

  DMD 40 includes a plurality of micromirrors arranged in a matrix. One micromirror constitutes one pixel. The micromirror is driven on and off at high speed based on DMD drive signals corresponding to incident R light, G light, and B light.

  The light (R light, G light, B light) from each light source is modulated by changing the inclination angle of the micromirror. Specifically, when a micromirror of a certain pixel is in an off state, light reflected by the micromirror does not enter the projection unit 50. On the other hand, when the micromirror is on, the reflected light from the micromirror is incident on the projection unit 50. The gradation of the pixel is adjusted for each pixel by adjusting the ratio of the period during which the micromirror occupies the light emission period of each light source.

  The DMD 40 drives each micromirror in synchronization with the timing at which R light, G light, and B light are emitted from the light source device 10 in a time division manner. The projection unit 50 includes a projection lens unit 51 and a reflection mirror 52. The light (image light) reflected by the DMD 40 passes through the projection lens unit 51 and is emitted to the reflection mirror 52. The image light is reflected by the reflection mirror 52 and is emitted to the outside from the projection port 210 provided in the main body cabinet 200. Images of R, G, and B color lights are projected on the projection surface in order. The image of the color light of each color projected on the projection surface is recognized by the human eye as a color image generated by superimposing the images of the color lights.

  FIG. 3 is a diagram illustrating a control structure of projector 100 according to Embodiment 1 of the present invention.

  Referring to FIG. 3, projector 100 includes light source device 10 (FIG. 2), DMD 40 (FIG. 2), projection unit 50 (FIG. 2), imaging unit 500 (FIG. 1), and test pattern generation unit 310. A video signal input unit 320, a selector (selection circuit) 330, a correction instruction unit 350, a projection condition estimation unit 360, and an operation reception unit 340.

  The video signal input unit 320 receives a video signal given from an external video source device (not shown). The video signal input unit 320 processes the received video signal into a signal for display and outputs it.

  Specifically, the video signal input unit 320 writes the received video signal in a frame memory (not shown) for each frame (one screen) and reads the video written in the frame memory. In the process of writing and reading, various image processes are performed to convert the received video signal to generate a display video signal for a projected image. Note that image processing performed by the video signal input unit 320 includes image distortion correction processing for correcting image distortion caused by the relative inclination between the optical axis of the projection light from the projector 100 and the projection plane, Image size adjustment processing for enlarging or reducing the display size of the projected image to be displayed is included.

  The test pattern generation unit 310 generates a test pattern to be used for the adjustment process of the emitted light amount of the light source device 10 described later (hereinafter also simply referred to as “light amount adjustment process”). The test pattern is an image for estimating the projection condition of the image displayed on the projection plane (see FIGS. 5 and 6). The projection conditions include at least a projection condition for designating the display size of the projection image. The projection conditions for designating the display size of the projection image include the zoom magnification and projection distance of the projection lens unit 51.

  The test pattern can also be used as a test pattern for recognizing an image projection state (image distortion state, display position, etc.) in the above-described image distortion correction processing and image size adjustment processing.

  The selector 330 receives a display video signal from the video signal input unit 320 at a first input terminal, and receives a test pattern from the test pattern generation unit 310 at a second input terminal. The selector 330 selects either the display video signal or the test pattern in accordance with the select signal given from the correction instruction unit 350 and outputs it to the DMD 40.

  The operation reception unit 340 receives a remote control signal transmitted from a remote controller operated by the user. The operation receiving unit 340 can receive not only a remote control signal but also a signal from an operation panel provided in the main body cabinet 200. When an operation is performed on the remote controller or the operation panel, the operation receiving unit 370 receives the operation and generates a command signal that triggers various operations.

  Specifically, the operation reception unit 340 adjusts the amount of light emitted from the light source device 10 when the user instructs the brightness adjustment of the projected image by operating the remote control, the operation panel, or the menu screen. A command signal (hereinafter also referred to as “light quantity adjustment instruction”) for performing adjustment processing is generated and output to the correction instruction unit 350.

  Alternatively, the correction instruction unit 350 automatically performs the light amount adjustment process according to the brightness of the display video signal given from the video signal input unit 320, in addition to the configuration in which the light amount adjustment process is performed according to the user's instruction. Is also possible. Alternatively, when the change in the arrangement of the projector 100 is detected by an inclination sensor (not shown) or the like, the light amount adjustment process may be automatically executed.

  The correction instruction unit 350 generates a select signal for selecting either the display video signal or the test pattern in response to the light amount adjustment instruction from the operation reception unit 340 and outputs the select signal to the selector 330. Specifically, the correction instruction unit 350 generates a selection signal for selecting a display video signal and outputs the selection signal to the selector 330 when the light amount adjustment instruction is not received from the operation reception unit 340. The selector 330 outputs the display video signal to the DMD 40 according to the select signal. When the DMD 40 generates a DMD drive signal (on / off signal) based on the display video signal, the DMD 40 is based on the DMD drive signal in synchronization with the timing at which the R light, G light, and B light are emitted from the light source device 10 in a time division manner. To drive each micromirror. Thereby, image light corresponding to the display image signal is formed for each color light, and is enlarged and projected on the projection plane by the projection unit 50.

  On the other hand, when a light amount adjustment instruction is received from the operation reception unit 340, the correction instruction unit 350 generates a select signal for selecting a test pattern and outputs it to the selector 330. The selector 330 outputs the test pattern to the DMD 40 according to the select signal. The DMD 40 drives each micromirror based on the DMD drive signal generated based on the test pattern. Thereby, image light corresponding to the test pattern is formed for each color light, and is enlarged and projected on the projection surface by the projection unit 50.

  The correction instructing unit 350 generates a select signal for selecting a test pattern, and also generates a control signal for instructing the estimation of the projection condition of the test pattern displayed on the projection plane to generate the projection condition estimating unit 360. Output to.

  The projection condition estimation unit 360 estimates the projection condition according to the instruction from the correction instruction unit 350. Specifically, when the projection condition estimation unit 360 acquires image data (imaging data) representing the captured image of the projection plane generated by the imaging unit 500, the projection condition estimation unit 360 estimates the projection condition based on the imaging data. Then, the projection condition estimation unit 360 adjusts the amount of light emitted from the light source device 10 in order to set the brightness of the projected image to a predetermined brightness according to the estimated projection conditions.

  Hereinafter, the light amount adjustment processing executed in projector 100 according to Embodiment 1 of the present invention will be described with reference to the drawings.

(Light intensity adjustment process)
FIG. 4 is a flowchart showing a control processing procedure for realizing the light amount adjustment processing in the projector according to Embodiment 1 of the present invention. In addition, the process of each step of the flowchart shown below including FIG. 4 is performed by the software process or hardware process by the control structure shown in FIG. Further, the process of the flowchart shown in FIG. 4 is executed every predetermined time or every time a predetermined condition is satisfied.

  Referring to FIG. 4, correction instruction unit 350 determines whether or not a light amount adjustment instruction is input from operation accepting unit 340 in step S <b> 01. If the light amount adjustment instruction has not been input (NO in step S01), the processing is terminated without performing the subsequent processing.

  On the other hand, when a light amount adjustment instruction is input (when YES is determined in step S01), the correction instruction unit 350 performs a light amount adjustment process. Specifically, the correction instruction unit 350 generates a select signal for selecting a test pattern and outputs it to the selector 330 in step S02. The selector 330 selects a test pattern according to the select signal and outputs it to the DMD 40. When the image light corresponding to the test pattern is formed by the DMD 40, the projection unit 50 projects the image light on the projection surface.

  FIG. 5 shows an example of a test pattern. Referring to FIG. 5, the test pattern is an image that constitutes at least a part of four line segments (L1 to L4) that constitute four intersections (C1 to C4). In the figure, the four line segments (L1 to L4) are represented by shading or light / dark differences (edges). The test pattern is an image composed of a black background and a white diamond, and the four sides of the white diamond constitute at least a part of the four line segments (L1 to L4). Note that the four line segments (L1 to L4) have an inclination with respect to a predetermined readout direction (horizontal direction).

  As shown in FIG. 6A, the test pattern may be an image composed of a black background and a white triangle. Alternatively, as shown in FIG. 6B, it may be an image composed of a black background and a pair of white triangles, or as shown in FIG. (Also referred to as a 0% luminance image).

  Returning to FIG. 4, in step S <b> 03, the imaging unit 500 captures the test pattern displayed on the projection plane and generates imaging data. The projection condition estimation unit 360 detects a projection area based on the imaging data. Specifically, the projection condition estimation unit 360 detects the four corners of the projection area 410 in the captured image 400 of FIG. Furthermore, the projection condition estimation unit 360 detects three or more intersections in the captured image based on the captured data. Hereinafter, a case where the test pattern is the image shown in FIG. 5 (open diamond) will be exemplified. Three or more intersections in the captured image respectively correspond to three or more intersections in the test pattern. Three or more intersections in this test pattern are also referred to as “feature points” of the test pattern.

  Hereinafter, detection of feature points of a test pattern by the projection condition estimation unit 360 will be described with reference to FIGS.

FIG. 7 is a flowchart for explaining the processing in step S03 in FIG.
With reference to FIG. 7, the projection condition estimation unit 360 acquires imaging data of the test pattern generated by the imaging unit 500 in step S031. Then, in step S032, the projection condition estimation unit 360 sequentially reads captured images of the test pattern along a predetermined reading direction in the test pattern.

  Specifically, the projection condition estimation unit 360 includes a line buffer, and among the captured images generated by the image capturing unit 500, for each predetermined line that configures the test pattern, a captured image corresponding to the predetermined line is displayed. Read to line buffer.

  Further, the projection condition estimation unit 360 detects a feature point of the test pattern based on the captured image read to the line buffer in step S033.

  Specifically, the projection condition estimation unit 360 first acquires a point Pedge having a difference in density (lightness) or darkness (edge) based on the captured image read into the line buffer (see FIG. 8). That is, the projection condition estimation unit 360 acquires a point Pedge group corresponding to the four sides of the white diamond in the test pattern (FIG. 5).

  Next, as shown in FIG. 9, the projection condition estimation unit 360 acquires four line segments (L1 to L4) in the captured image based on the point Pedge group. That is, the projection condition estimation unit 360 acquires four line segments (L1 to L4) corresponding to the four line segments (L1 to L4) in the test pattern.

  Furthermore, the projection condition estimation unit 360 acquires four intersection points (C1 to C4) in the captured image based on the acquired four line segments (L1 to L4). That is, the projection condition estimation unit 360 acquires four intersection points (C1 to C4) corresponding to the four intersection points (C1 to C4) that are the characteristic points of the test pattern.

  Returning to FIG. 4, when the feature points C1 to C4 of the test pattern in the captured image are detected by the process of step S03, the projection condition estimation unit 360 uses the detected feature points C1 to C4 in step S04. Thus, the zoom magnification of the projection lens unit 51 is estimated. Then, the projection condition estimation unit 360 calculates a light amount adjustment coefficient Kz in the light amount adjustment process based on the estimated zoom magnification.

FIG. 10 is a conceptual diagram illustrating the estimation of the zoom state by the projection condition estimation unit 360.
Projector 100 according to the first embodiment has a zoom adjustment function for adjusting the display size of an image displayed on the projection surface. Specifically, the zoom magnification of the projection lens unit 51 can be adjusted by changing the relative position of the projection lens unit 51 in the optical axis direction by a zoom mechanism (not shown) provided in the projection unit 50. it can.

  FIG. 10A shows a test pattern displayed on the projection plane when the zoom magnification is set to the widest side (wide end). FIG. 10B shows a test pattern displayed on the projection plane when the zoom magnification is set to the telephoto side (tele end).

  In the first embodiment, when the zoom magnification is set to the wide end, the display size is doubled compared to when the zoom magnification is set to the tele end. That is, as shown in FIG. 10A, if the distance x from the center point M1 of the test pattern displayed when the zoom magnification is at the wide end to each feature point C1 to C4 is defined as 1, the zoom magnification is When the test pattern is displayed on the same projection plane with the tele end, the distance x from the center point M1 of the test pattern to each of the feature points C1 to C4 is ½.

  In the first embodiment, when the projection condition estimation unit 360 detects the feature points (C1 to C4) of the test pattern by the processing in step S03 in FIG. 4, the center point M1 and each feature point C1 at the current zoom magnification. The distance x to ~ C4 is calculated. Then, the projection condition estimation unit 360 calculates the ratio of the distance x at the current zoom magnification to the distance x = 1 when the zoom magnification is at the wide end as the light amount adjustment coefficient Kz. For example, as shown in FIG. 10B, when the zoom magnification is set to the tele end, the light amount adjustment coefficient Kz = 1/2.

  In FIG. 10, the method for estimating the zoom magnification is described assuming that the optical axis of the projector 100 and the normal line of the projection plane are parallel to each other, but the optical axis of the projector 100 and the normal line of the projection plane are It is also possible to estimate the zoom magnification in consideration of the amount of deviation. In this case, since the center point of the captured image and the center point M1 of the test pattern (open diamond) do not match, the projection condition estimation unit 360 determines the distance from the center point of the captured image to the feature points C1 to C4. The zoom magnification is estimated by calculating x1 to X4 respectively and comprehensively considering the calculated distances x1 to X4. Then, the projection condition estimation unit 360 calculates a light amount adjustment coefficient Kz based on the estimated zoom magnification.

  Referring to FIG. 4 again, in step S05, projection condition estimation unit 360 uses projection test feature points C1 to C4 detected in step S03 to calculate a projection distance that is the distance from projector 100 to the projection plane. presume. The projection condition estimation unit 360 calculates a light amount adjustment coefficient Kd in the light amount adjustment process based on the estimated projection distance.

FIG. 11 is a conceptual diagram for explaining projection distance estimation by the projection condition estimation unit 360.
FIG. 11A shows a captured image generated by the imaging unit 500 when the projection distance is set to a maximum value (maximum projection distance) Dmax of a predetermined settable range. In the figure, it is assumed that the imaging unit 500 is disposed on the right side of the projection unit 50 toward the projection surface. In this case, the positional relationship between the imaging area of the imaging unit 500 and the projection area of the projector 100 is shifted to the left with respect to the imaging area.

  When the projection distance is shortened from the state shown in FIG. 11A, the positional relationship between the imaging region and the projection region changes. FIG. 11B shows a captured image generated by the imaging unit 500 when the projection distance D is shorter than the maximum projection distance Dmax (D <Dmax).

  As shown in FIG. 11B, when the projection distance D is set, the amount of deviation of the projection area with respect to the imaging area becomes larger than in the case of the maximum projection distance Dmax. In the figure, the test pattern at the projection distance D (D <Dmax) is indicated by a solid line, and the test pattern when the positional relationship between the imaging area and the projection area at the maximum projection distance Dmax is applied is indicated by a broken line. In the case of the projection distance D, the test pattern is shifted to the left as compared with the case of the maximum projection distance Dmax.

  In the first embodiment, the projection condition estimation unit 360 compares the captured image of the test pattern at the maximum projection distance Dmax with the captured image of the test pattern at the current projection distance, and shifts the projection area in the imaging area. Detect the amount. Then, the current projection distance is estimated based on the detected deviation amount of the projection area.

  Specifically, the projection condition estimation unit 360 detects the relative position of the center point M1 of the test pattern with respect to the imaging region from the captured image of the test pattern when the projection distance is the maximum projection distance Dmax. Furthermore, the projection condition estimation unit 360 detects the relative position of the center point M1 of the test pattern with respect to the imaging region from the captured image of the test pattern at the current projection distance. Then, the projection condition estimation unit 360 is based on the amount of deviation of the relative position of the center point M1 at the current projection distance from the relative position of the center point M1 at the maximum projection distance Dmax (corresponding to Δs in the figure). Estimate the projection distance. In the first embodiment, the projection condition estimation unit 360 responds by acquiring the relationship between the relative position shift amount Δs of the center point M1 and the projection distance in advance and referring to the acquired relationship. The projection distance is estimated from the relative position shift amount Δs.

  Then, the projection condition estimation unit 360 calculates the ratio of the current projection distance with respect to the maximum projection distance Dmax as the light amount adjustment coefficient Kd. That is, the light quantity adjustment coefficient Kd is Kd = 1 at the maximum projection distance Dmax, and the light quantity adjustment coefficient Kd = D / Dmax at the projection distance D as shown in FIG.

  Returning to FIG. 4, in step S06, the projection condition estimation unit 360 adjusts the amount of light emitted from the light source device 10 using the light amount adjustment coefficients Kz and Kd calculated in steps S04 and S05.

FIG. 12 is a flowchart for explaining the processing in step S06 in FIG.
Referring to FIG. 12, in step S061, the projection condition estimation unit 360 acquires a light amount adjustment coefficient Kz calculated based on the zoom magnification and a light amount adjustment coefficient Kd calculated based on the projection distance.

  Further, the projection condition estimation unit 360 sets a target value (hereinafter also referred to as “target light amount”) Lg of the emitted light amount of the light source device 10 in step S062. The target light amount Lg corresponds to the emitted light amount of the light source device 10 for making the projected image have a predetermined brightness when the light amount adjustment coefficients Kz and Kd are both 1. In other words, the target light amount Lg is the amount of light emitted from the light source device 10 that is necessary for setting the projected image to a predetermined brightness under the projection condition that the zoom magnification is at the wide end and the projection distance is the maximum projection distance Dmax. Equivalent to.

  Next, in step S063, the projection condition estimation unit 360 emits the light source device 10 necessary for setting the projected image to a predetermined brightness under the current projection conditions based on the target light amount Lg and the light amount adjustment coefficients Kz and Kd. The light quantity Lp is set.

  Here, the relationship shown in Expression (1) is established between the target light amount Lg and the emitted light amount (hereinafter also referred to as “current light amount”) Lp of the light source device 10 under the current projection conditions.

  In the above formula (1), when the light amount adjustment coefficient Kz = Kd = 1, the target light amount Lg = the current light amount Lp. That is, when the zoom magnification is at the wide end and the projection distance is the maximum projection distance Dmax, the light source device 10 is driven and controlled so that the emitted light amount Lp of the light source device 10 becomes the target light amount Lg.

On the other hand, as described with reference to FIG. 10, when the zoom magnification changes from the wide end to the tele end, the light amount adjustment coefficient Kz becomes a value smaller than 1. According to the above equation (1), the current light amount Lp becomes smaller than the target light amount Lg as the light amount adjustment coefficient Kz decreases. This is because even if the amount of light emitted from the light source device 10 is the same, the projection area becomes narrower as the zoom magnification becomes higher (that is, as the projection angle of view becomes smaller), and thus the projected image becomes brighter. For example, when the zoom magnification is at the tele end (light quantity adjustment coefficient Kz = 1/2), the projection area is reduced to 1/4 compared to when the zoom magnification is at the wide end (light quantity adjustment coefficient Kz = 1). Since it decreases, the brightness of the projected image is quadrupled. Therefore, even if the emitted light amount Lp of the light source device 10 is reduced to 1/4 times the target light amount Lg when the zoom magnification is at the wide end, a projected image with a predetermined brightness can be obtained. 1 / Kz ² in the above formula (1) reflects the relationship between the zoom magnification and the brightness of the projected image.

For the same purpose, in the above formula (1), 1 / Kd ² reflects the relationship between the projection distance and the brightness of the projected image. When the projection angle of view is constant, even if the amount of light emitted from the light source device 10 is the same, the projection area decreases as the projection distance becomes shorter, so the projected image becomes brighter. For example, in FIG. 11, when the projection distance becomes ½ of the maximum projection distance Dmax, the projection area decreases to ¼, and the brightness of the projected image increases four times. Therefore, even if the emitted light amount Lp of the light source device 10 is reduced to 1/4 times the target light amount Lg when the projection distance is the maximum projection distance Dmax, a projected image with a predetermined brightness can be obtained.

  Returning to FIG. 12, when the projection light amount estimation unit 360 sets the emitted light amount Lp of the light source device 10 by the process of step S063, the projected light amount Lp is output to the light source device 10 as a command value of the emitted light amount in step S064. . The light source device 10 adjusts the emitted light amounts of the light sources 10R, 10G, and 10B according to the command value of the emitted light amount given from the projection condition estimation unit 360.

  As described above, according to the projector according to the first embodiment of the present invention, the projection condition (zoom magnification and projection distance) is estimated based on the captured image of the predetermined test pattern, and the light source device is set according to the estimated projection condition. The amount of emitted light is adjusted. Thereby, even if the display size of the image on the projection surface changes due to the change in the projection distance due to the change in the arrangement of the projectors, the projected image can be kept at a predetermined brightness. Further, since the amount of light emitted from the light source device is adjusted so as to adapt to the projection conditions, it is possible to achieve low power consumption while ensuring the visibility of the projected image.

  Although the projection condition estimation according to the first embodiment has exemplified the configuration in which the zoom magnification and the projection distance for designating the display size of the projection image are used as parameters, and these parameters are estimated, the visibility of the projection image is improved. The parameters are not limited to the above-described examples as long as they are influential parameters. In the following second to fourth embodiments, a configuration in which parameters other than the zoom magnification and the projection distance are further estimated, and the amount of light emitted from the light source device 10 is adjusted by comprehensively considering the estimated parameters will be described. .

[Embodiment 2]
In addition to the zoom magnification and the projection distance (that is, the display size of the projection image) described above, the brightness of the projection image varies depending on the reflectance of the image light on the projection surface. For example, a reflective screen can display a bright projected image because of the high reflectance of the projection surface, whereas a diffuse screen has a lower reflectance than that of the above-described reflective screen. Even if the amount of image light emitted from 100 is the same, the brightness of the projected image decreases.

  As shown in FIG. 1, when the projection surface is provided on the floor surface on which the projector 100 is placed, the floor surface does not have gloss when the floor surface is glossy or white. The reflectance of the projection surface is higher than when the color is black or black. For this reason, ambient light such as illumination light is reflected on the floor surface and enters the projection area, which may reduce the contrast of the projected image.

  Therefore, in the second embodiment, by further including the reflectance of the projection surface in the projection condition, the influence of the reflectance of the projection surface is compensated by adjusting the light amount of the light source device 10.

  FIG. 13 is a flowchart showing a control processing procedure for realizing light amount adjustment in the projector according to Embodiment 2 of the present invention. Note that the flowchart shown in FIG. 13 is executed as the process of step S06 (the light amount adjustment process of the light source device 10) in the flowchart shown in FIG.

  With reference to FIG. 13, the projection condition estimation unit 360 acquires the light amount adjustment coefficients Kz and Kd in step S071, and subsequently estimates the reflectance of the projection plane in step S072. Then, the projection condition estimation unit 360 calculates a light amount adjustment coefficient Kr in the light amount adjustment process based on the estimated reflectance.

FIG. 14 is a flowchart illustrating the process of step S072 of FIG.
Referring to FIG. 14, correction instruction unit 350 projects a test pattern (see FIG. 6C) composed of a 0% luminance image in step S081. Specifically, the correction instruction unit 350 generates a select signal for selecting the test pattern of the 0% luminance image generated by the test pattern generation unit 310 and outputs it to the selector 330. The selector 330 outputs the test pattern to the DMD 40 according to the select signal. The DMD 40 drives each micromirror based on the DMD drive signal generated based on the test pattern. As a result, image light corresponding to the 0% luminance image is formed for each color light, and is enlarged and projected on the projection plane by the projection unit 50.

  The imaging unit 500 captures a projection surface on which a test pattern having a 0% luminance image is projected. In step S082, the projection condition estimation unit 360 captures the captured image acquired by the imaging unit 500, and stores it as a first image.

  Further, in step S83, the projection condition estimation unit 360 performs a process similar to that in step S081, thereby projecting a test pattern including a white plain image (hereinafter also referred to as a 100% luminance image) on the projection surface. The imaging unit 500 captures a projection surface on which a test pattern having a 100% luminance image is projected. In step S084, the projection condition estimation unit 360 captures the captured image acquired by the imaging unit 500 and stores it as a second image.

  Next, the projection condition estimation unit 360 compares the first image and the second image by comparing the first image (luminance 0% display) and the second image (luminance 100% display) in step S085. The difference from the image is detected. Then, the projection condition estimation unit 360 estimates the reflectance of the projection surface based on the detected difference. The difference between the first image (luminance 0% display) and the second image (luminance 100% display) corresponds to the amount of video light reflected by the projection surface. The projection condition estimation unit 360 can estimate the reflectance of the projection surface by calculating the ratio of the amount of image light reflected by the projection surface to the amount of image light incident on the projection surface from the projector 100. .

  In order to estimate the reflectance of the projection surface, two images having different brightness may be projected onto the projection surface, and these two images are not limited to the 0% luminance image and the 100% luminance image.

  In step S086, the projection condition estimation unit 360 sets the estimated reflectance of the projection surface to the light amount adjustment coefficient Kr.

  Returning to FIG. 13, the projection condition estimation unit 360 sets the target light amount Lg of the light source device 10 in step S073. The processing in step S073 is the same as the processing in step S062 in FIG.

  Next, in step S074, the projection condition estimation unit 360, based on the target light amount Lg and the light amount adjustment coefficients Kz, Kd, Kr, the light source device 10 necessary for setting the projected image to a desired brightness under the current projection conditions. Is set.

  In the second embodiment, the relationship shown in Expression (2) is established between the target light amount Lg and the emitted light amount (current light amount) Lp of the light source device 10 under the current projection conditions.

  The above equation (2) further multiplies the current light amount Lp by a light amount adjustment coefficient Kr based on the reflectance of the projection surface, as compared with the equation (1) shown in the light amount adjustment processing according to the first embodiment. It is different in point. This is based on the fact that the reflectance of the projection surface is proportional to the brightness of the projected image. That is, the lower the reflectance of the projection surface (the smaller the light amount adjustment coefficient Kr), the lower the brightness of the projected image. Therefore, the influence of the reflectance of the projection surface is compensated by increasing the emitted light amount Lp of the light source device 10 over the target light amount Lg when the reflectance of the projection surface is 1 (light amount adjustment coefficient Kr = 1).

  When the projection condition estimation unit 360 sets the emitted light amount Lp of the light source device 10 by the processing in step S073, in step S074, the projection condition estimation unit 360 outputs the emitted light amount Lp to the light source device 10 as a command value for the emitted light amount. The light source device 10 adjusts the emitted light amounts of the light sources 10R, 10G, and 10B according to the command value of the emitted light amount given from the projection condition estimation unit 360.

  As described above, according to the projector according to the second embodiment of the present invention, the projection conditions (zoom magnification, projection distance, and reflectance of the projection plane) are estimated based on the captured image of the predetermined test pattern, and the estimated projection The amount of light emitted from the light source device is adjusted according to the conditions. As a result, even when the display size of the projected image or the reflectance of the projection surface changes due to changes in the projection conditions, the visibility (brightness and contrast) of the projected image is optimized while achieving low power consumption. Can be kept in a state.

  In the second embodiment, the reflectance of the projection plane is estimated based on the captured images of two test patterns having a luminance difference. However, various objects that are assumed to be used on the projection plane are described. The reflectance (corresponding to the light amount adjustment coefficient Kr) can be acquired in advance. FIG. 15 shows an example of the relationship between the projection plane and the light amount adjustment coefficient Kr (reflectance). The user can set the light quantity adjustment coefficient Kr according to the corresponding projection plane by referring to the relationship between the projection plane and the light quantity adjustment coefficient Kr shown in FIG.

[Embodiment 3]
The visibility of a projected image also changes depending on ambient light (environment light) such as illumination light in a room where the projector is installed. For example, when the brightness of the ambient light is high, the contrast and color reproducibility of the projected image are reduced. In the third embodiment, the influence of the environmental light is compensated by adjusting the light amount of the light source device 10 by further including the luminance of the environmental light in the projection conditions.

  FIG. 16 is a flowchart showing a control processing procedure for realizing light amount adjustment in the projector according to Embodiment 3 of the present invention. Note that the flowchart shown in FIG. 16 is executed as the process of step S06 (the light amount adjustment process of the light source device 10) in the flowchart shown in FIG.

  Referring to FIG. 16, projection condition estimation unit 360 acquires the light amount adjustment coefficients Kz and Kd in step S091, and then estimates the brightness of the ambient light in step S092. Then, the projection condition estimation unit 360 calculates a light amount adjustment coefficient Ke in the light amount adjustment process based on the estimated luminance of the ambient light.

  Specifically, the correction instruction unit 350 projects a test pattern (see FIG. 6C) composed of a 0% luminance image. The projection condition estimation unit 360 is an illuminance sensor (not shown) installed on the side surface of the main body cabinet 200 to determine the brightness of the installation environment of the projector 100 in a state where a test pattern of a 0% luminance image is projected on the projection surface. Detect by. Then, the projection condition estimation unit 360 estimates the brightness of the ambient light based on the detection value of the illuminance sensor.

  The projection condition estimation unit 360 sets the light amount adjustment coefficient Ke so that the light intensity adjustment coefficient Ke is 1 when the brightness of the ambient light is equal to or less than a predetermined threshold, and becomes a larger value as the brightness of the ambient light increases.

  The projection condition estimation unit 360 sets the target light amount Lg of the light source device 10 in step S093. The processing in step S093 is the same as the processing in step S062 in FIG.

  Next, in step S094, the projection condition estimation unit 360, based on the target light amount Lg and the light amount adjustment coefficients Kz, Kd, Ke, the light source device 10 necessary for setting the projected image to a desired brightness under the current projection conditions. Is set.

  In the third embodiment, the relationship shown in Expression (3) is established between the target light amount Lg and the emitted light amount (current light amount) Lp of the light source device 10 under the current projection conditions.

  The above equation (3) further multiplies the current light amount Lp by the reciprocal of the light amount adjustment coefficient Ke based on the brightness of the ambient light, as compared with the equation (1) shown in the light amount adjustment processing according to the first embodiment. It is different in point to do. This is based on the fact that the visibility (contrast, color reproducibility, etc.) of the projected image decreases as the brightness of the ambient light increases, that is, as the light amount adjustment coefficient Ke increases. In the third embodiment, when the light amount adjustment coefficient Ke is large, the influence of the environmental light is increased by increasing the emitted light amount Lp of the light source device 10 over the target light amount Lg when the light amount adjustment coefficient Ke = 1. To compensate.

  When the projection condition estimation unit 360 sets the emitted light amount Lp of the light source device 10 by the process of step S094, in step S095, the projection condition estimation unit 360 outputs the emitted light amount Lp to the light source device 10 as a command value for the emitted light amount. The light source device 10 adjusts the emitted light amounts of the light sources 10R, 10G, and 10B according to the command value of the emitted light amount given from the projection condition estimation unit 360.

  As described above, according to the projector according to the third embodiment of the present invention, the brightness of the ambient light is estimated as the projection condition in addition to the zoom magnification and the projection distance, and the amount of light emitted from the light source device according to the estimated projection condition. Adjust. Thereby, even if the display size of the projection image or the brightness of the ambient light changes due to the change of the projection condition, the visibility of the projection image can be maintained in the optimum state while realizing low power consumption.

  In the third embodiment, the configuration in which the brightness of the ambient light is estimated based on the detection value of the illuminance sensor when the 0% brightness image is projected has been described. However, the brightness 0% image (or 100% brightness image) is described. It is good also as a structure which estimates the brightness | luminance of environmental light based on the captured image when this is projected. In this case, the brightness of the ambient light is estimated based on the difference between the 0% brightness image (or 100% brightness image) formed by the DMD 40 and the captured image of the brightness 0% image (or 100% brightness image). Can do.

[Embodiment 4]
In the fourth embodiment, application of the present invention to a projector configured to be capable of three-dimensional display for perceiving a projected image in three dimensions will be described.

  FIG. 17 is a conceptual diagram illustrating an embodiment of a projector capable of three-dimensional display. In the fourth embodiment, as one form of three-dimensional display, a side-by-side method is used in which video light for the right eye is positioned on the right side of the screen and video light for the left eye is positioned on the left side of the screen. The three-dimensional display method is not particularly limited to the side-by-side method, and various known methods may be used. Also, as a side-by-side method, instead of a configuration in which the right eye image light and the left eye image light are divided into left and right, the right eye image light and the left eye image light are divided vertically. It is good also as a structure to form.

  Referring to FIG. 17, projector 100 according to Embodiment 4 receives a video signal for three-dimensional display. In this three-dimensional display video signal, the left-eye (L-side) video signal frame and the right-eye (R-side) video signal frame are each compressed in half in the horizontal direction. One frame is arranged in the horizontal direction. In the projection direction of the projector 100, an optical shutter 70 for shielding or transmitting image light emitted from the projector 100, and a polarizing element for polarizing light incident in a polarization direction corresponding to the L side or the R side. 80 are arranged.

  In the projector 100, the DMD 40 sequentially forms video light corresponding to the L-side video signal (video light for left eye) and video light corresponding to the R-side video signal (video light for right eye). When the image light for the left eye and the image light for the right eye are emitted from the projector 100 in a time-sharing manner, the image light passes through the optical shutter 70 and is further polarized in a predetermined polarization direction by the polarizing element 80 and then displayed on the projection plane. Is done.

  When the user wears the polarizing glasses 1000, the left eye image light is incident on the left eye, and the right eye image light is incident on the right eye. Thereby, the user can perceive the stereoscopic image by binocular parallax. In the two-dimensional display, since there is no such binocular parallax, the image visually recognized by the left eye and the image visually recognized by the right eye are the same.

  As described above, when three-dimensional display is performed by one projector 100, the video light for the left eye and the video light for the right eye are displayed in a time division manner. Therefore, the light amounts of the left-eye image light and the right-eye image light are reduced to ½ compared to the light amount of the image light when performing two-dimensional display. Therefore, in order to display an image three-dimensionally with the same brightness as in two-dimensional display, it is necessary to increase the amount of light emitted from the light source device 10 twice.

  When the projector is configured to be able to realize multi-viewpoint three-dimensional display, the light amounts of the left-eye video light and the right-eye video light are further reduced as the set number of viewpoints increases. For example, when the number of viewpoints is N (N is a natural number), the light amount of each image light is reduced to 1 / (2N) of the light amount of the image light at the time of two-dimensional display.

In the fourth embodiment, the ratio of the light amount of the image light at the time of three-dimensional display to the light amount of the image light at the time of two-dimensional display is calculated as a luminance reduction rate indicating the degree of brightness reduction of the projected image. Then, the brightness reduction rate calculated as the light amount adjustment coefficient K _3D during three-dimensional display to adjust the emitted light amount of the light source device 10.

  FIG. 18 is a flowchart showing a control processing procedure for realizing light amount adjustment in the projector according to Embodiment 4 of the present invention. Note that the flowchart shown in FIG. 18 is executed as the process of step S06 (the light amount adjustment process of the light source device 10) in the flowchart shown in FIG.

With reference to FIG. 18, the projection condition estimation unit 360 acquires the light amount adjustment coefficients Kz and Kd in step S011, and subsequently determines whether or not the projector 100 is performing three-dimensional display in step S012. When the projector 100 is performing two-dimensional display (when NO is determined in step S012), the projection condition estimation unit 360 sets the light amount adjustment coefficient K _3D = 1 in response to the luminance reduction rate being 1. Set.

On the other hand, when the projector 100 is performing three-dimensional display (when YES is determined in step S012), the projection condition estimating unit 360 proceeds to step S013 and calculates a luminance reduction rate by the three-dimensional display. Then, the projection condition estimation unit 360 sets the calculated luminance reduction rate to the light amount adjustment coefficient K _3D in the light amount adjustment process. That is, the light quantity adjustment coefficient K _3D = 1 / (2N) is set using the viewpoint number N.

  Next, the projection condition estimation unit 360 sets the target light amount Lg of the light source device 10 in step S015. The processing in step S015 is the same as the processing in step S062 in FIG.

In step S016, the projection condition estimation unit 360 emits light from the light source device 10 necessary for setting the projected image to a desired brightness under the current projection conditions based on the target light amount Lg and the light amount adjustment coefficients Kz, Kd, K _3D. The light quantity Lp is set.

  In the fourth embodiment, the relationship shown in Expression (4) is established between the target light amount Lg and the emitted light amount (current light amount) Lp of the light source device 10 under the current projection conditions.

Compared with the equation (1) shown in the light amount adjustment processing according to the first embodiment, the above equation (4) is obtained by adding a light amount adjustment coefficient K _3D based on the number N of viewpoints of three-dimensional display to the current light amount Lp. Furthermore, it is different in that it is multiplied. This is because as the number of viewpoints N in the three-dimensional display increases, that is, as the light amount adjustment coefficient K _3D decreases, the amount of video light for the left eye and right eye decreases, and the brightness of the projected image decreases. In the third embodiment, when the light amount adjustment coefficient K _3D is small, the emitted light amount Lp of the light source device 10 is increased compared to the target light amount Lg at the time of two-dimensional display (light amount adjustment coefficient K _3D = 1). The image during three-dimensional display is set to a desired brightness.

  When the projection condition estimation unit 360 sets the emitted light amount Lp of the light source device 10 by the process of step S016, in step S017, the projection condition estimation unit 360 outputs the emitted light amount Lp to the light source device 10 as a command value for the emitted light amount. The light source device 10 adjusts the emitted light amounts of the light sources 10R, 10G, and 10B according to the command value of the emitted light amount given from the projection condition estimation unit 360.

  As described above, according to the projector according to the fourth embodiment of the present invention, as a projection condition, in addition to the zoom magnification and the projection distance, a luminance reduction rate by three-dimensional display is estimated, and a light source according to the estimated projection condition Adjust the amount of light emitted from the device. Thereby, the visibility of the projected image can be maintained in an optimum state even during three-dimensional display by changing the projection conditions.

  In Embodiments 2 to 4, as parameters affecting the visibility of the projected image, the reflectance of the projection surface, the brightness of the ambient light, and the brightness reduction rate during three-dimensional display are exemplified, and for each parameter. The light quantity adjustment processing procedure has been described. However, the fact that the light amount adjustment process can be executed by combining these parameters will be described in a confirming manner.

  In the first to fourth embodiments, the DMD is exemplified as the light modulation element that modulates the light emitted from the light source device. However, a reflective liquid crystal panel or a transmissive liquid crystal panel may be used.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include meanings equivalent to the scope of claims for patent and all modifications within the scope.

  DESCRIPTION OF SYMBOLS 10 Light source device, 10R, 10G, 10B Light source, 20 Cross dichroic mirror, 30 Mirror, 50 Projection unit, 51 Projection lens unit, 52 Reflection mirror, 70 Optical shutter, 80 Polarization element, 100 Projector, 200 Main body cabinet, 210 Projection opening 310 test pattern generation unit, 320 video signal input unit, 330 selector, 340 operation reception unit, 350 projection condition estimation unit, 360 projection condition estimation unit, 370 operation reception unit, 400R, 400G, 400B cooling unit, 400 captured image, 410G, 410B heat sink, 410 projection area, 420G, 420B heat pipe, 500 imaging unit, 1000 polarized glasses.

Claims (6)

A light source device;
A light modulation element for generating image light by modulating light emitted from the light source device based on an input video signal;
A projection unit that projects image light generated by the light modulation element onto a projection surface;
An imaging unit that images the projection plane and generates a captured image;
A projection condition estimating means for estimating a projection condition for designating at least a display size of an image projected by the projection unit based on the captured image;
A projection-type image display device, comprising: a light amount adjusting unit for adjusting an emitted light amount of the light source device so that a projection image has a predetermined brightness according to the projection condition estimated by the projection condition estimating unit. . The projection display apparatus is configured to be able to switch between two-dimensional display and three-dimensional display,
The projection unit projects the first image light based on the video signal for the left eye and the second video light based on the video signal for the right eye in a time division manner, thereby realizing the three-dimensional display on the projection surface. Configured to
The projection condition estimation means estimates a luminance reduction rate for estimating a luminance reduction rate that is a ratio of reducing the luminance of the projected image in the three-dimensional display with respect to the luminance of the projected image in the two-dimensional display. Including means,
2. The projection display apparatus according to claim 1, wherein the light amount adjusting unit adjusts an emitted light amount of the light source device according to the projection condition estimated by the projection condition estimating unit and the luminance reduction rate. The projection condition estimating unit includes an ambient light luminance estimating unit for estimating an ambient light luminance,
2. The projection display apparatus according to claim 1, wherein the light amount adjusting unit adjusts an emitted light amount of the light source device according to the projection condition estimated by the projection condition estimating unit and the luminance of the ambient light. The projection condition estimation unit includes a reflectance estimation unit for estimating the reflectance of the projection surface,
2. The projection display apparatus according to claim 1, wherein the light amount adjusting unit adjusts an emitted light amount of the light source device according to the projection condition estimated by the projection condition estimating unit and a reflectance of the projection surface. . The projection unit is configured to project image light at an arbitrary zoom magnification by adjusting a projection angle of view,
5. The projection according to claim 1, wherein the projection condition estimation unit estimates the zoom magnification and the projection distance as a projection condition for designating a display size of an image projected by the projection unit. 6. Type image display device.   6. The light quantity adjusting means has a light quantity adjustment coefficient calculated using at least the zoom magnification and projection distance as parameters, and sets the light quantity adjustment coefficient according to the estimated zoom magnification and projection distance. The projection type image display device described in 1.

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