JP2004221716A - Position adjustment apparatus for optical modulator and position adjustment method for optical modulator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a position adjustment apparatus for an optical modulator and a position adjustment method for the optical modulator capable of controlling a position of the optical modulator to perform optimum focus adjustment. <P>SOLUTION: A focus position is positioned in a liquid crystal panel fitting step of a liquid crystal projector, a cross-shaped pattern is projected on the liquid crystal panel, every time the panel is moved in a direction of the Z axis, a video signal of a pattern image is read. The luminance of the pattern image is scanned in directions of the X and Y axes, and the position of the panel in the direction of the Z axis is obtained when contrast values B<SB>X</SB>, B<SB>Y</SB>are respectively maximized. Averaging the two positions obtains a position at which the panel is to be corrected. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical modulator adjustment device that is applied in a position adjustment step of an optical modulator when manufacturing a projection-type image display device that modulates light according to image information in an optical modulator and projects the light as a projection image. And an optical modulator adjustment method.
[0002]
[Prior art]
In a projection type image display device (projector), light modulated according to image information by a light modulator is synthesized, enlarged, and projected to form a projected image. For example, a three-panel type liquid crystal projector includes three liquid crystal panels corresponding to so-called R, G, and B primary colors of red, green, and blue as light modulators. FIG. 28 shows a schematic configuration of the main part. The light from the light source 101 is color-separated into R, G, and B by dichroic mirrors 102 and 103 and reflection mirrors 104, 105, and 106, and is incident on liquid crystal panels 107R, 107G, and 107B, respectively. In the liquid crystal panels 107R, 107G, and 107B, light is transmitted only at a pixel position to be displayed according to image information, and each modulated light is synthesized by the dichroic prism 108 and enlarged and projected by the projection lens 109.
[0003]
As described above, in the projector including a plurality of light modulators, (1) matching the position of each light modulator with the back focus of the projection lens so as not to cause blurring of the projected image; In order to prevent color misregistration of an image, it is important to match the projection positions of the same pixel between the optical modulators. For this reason, the optical modulators are fixed to the main body unit individually and after alignment between them. In the case of a liquid crystal projector, three liquid crystal panels 107R, 107G, and 107B are fixed to each surface of the dichroic prism 108 after alignment.
[0004]
FIG. 29 shows a schematic configuration of a position adjustment device used for position adjustment of a conventional optical modulator, and shows a state of position adjustment typified by a liquid crystal panel, particularly, a liquid crystal panel 107G. The position adjustment device includes a test pattern generator 110, a projection screen 111, an imaging unit 112 such as a CCD camera, a control unit 113 for controlling the operation of each unit, and an adjustment mechanism 114 for moving the liquid crystal panel 107G and adjusting its position. It has. The test pattern generator 110 gives a test pattern for displaying the four corners to the liquid crystal panel 107G, and projects a test pattern image on the projection screen 111. The test pattern images are picked up by four image pickup units 112 installed at four pattern projection positions in advance, converted into video signals, and input to the control unit 113. The control unit 113 calculates the amount of displacement and inclination of the liquid crystal panel 107G from the positions and contrast values of the four test patterns, converts the calculated amount into the amount of position correction of the liquid crystal panel 107G, and sends it to the adjustment mechanism 114. The adjustment mechanism 114 corrects the position and inclination of the liquid crystal panel 107G according to the input position correction amount.
[0005]
By such an operation, focus adjustment is performed to adjust each position of the liquid crystal panels 107R, 107G, and 107B to a position (back focus) where the projected image is most clearly formed on the projection screen 111. After the alignment of the panel 10G, the liquid crystal panels 107R and 107B are aligned based on this position, thereby performing registration for aligning the pixel positions between the panels.
[0006]
[Problems to be solved by the invention]
The focus adjustment is performed using the contrast value of the projected image when the position of the liquid crystal panel is changed in the optical axis direction as an index. The contrast value is a difference between the maximum value and the minimum value of the luminance in the projection image, and is usually calculated from a luminance change in one direction of the test pattern image. For example, as shown in FIG. 30A, the test pattern is subjected to luminance scanning of the lattice stripe 150 in the direction of the arrow 151, and a contrast value 152 is obtained from the luminance pattern corresponding to the lattice stripe 150 as shown in FIG. It is calculated (see Patent Document 1).
[0007]
[Problems to be solved by the invention]
However, in a projector whose focus has been adjusted by such a method, the projected image is clear in the luminance scanning direction at the time of adjustment, but if it deviates from that direction, a so-called out-of-focus state may occur, causing a large flare. Was.
[0008]
The present invention has been made in view of such a problem, and an object of the present invention is to control a position of an optical modulator to perform an optimal focus adjustment. It is to provide a position adjustment method.
[0009]
[Patent Document 1]
JP-A-11-178014
[0010]
[Means for Solving the Problems]
The position adjusting device for an optical modulator of the present invention modulates light by lighting pixels according to image information to generate one or more optical modulators to generate a projection image, and a projection image from the optical modulator. A position adjusting device for adjusting a mounting position of an optical modulator when manufacturing a projection type image display device including a video projection unit for enlarging and projecting, wherein the position of the optical modulator is adjusted. Position adjusting means, test pattern generating means having a function of giving a test pattern having a shape having components in two directions orthogonal to each other to the optical modulator, and a test pattern image generated by the optical modulator is used for projecting the image. Screen projected through the screen, imaging means for capturing an image on the projection screen and converting the image into a video signal, and a test pattern having a shape having two orthogonal directional components on the projection screen When the projected image is projected, while controlling the position adjusting means to move the optical modulator in the optical axis direction of the modulated light, acquire a video signal corresponding to the projected image every time the optical modulator moves. Calculating the contrast value of the projected image in each of two orthogonal directions based on the video signal, obtaining two position coordinates of the optical modulator in which each of the two contrast values is maximum, and obtaining two position coordinates. Is used as the correction position of the optical modulator, and control means having a function of controlling the position adjusting means based on the correction position is provided. In the present invention, the “shape having components in each direction of two orthogonal axes” refers to a shape including a line segment extending in each direction of two orthogonal axes. Examples of such a shape include a cross shape, a T-shape, an L-shape, and a rectangular shape (including a square).
[0011]
The position adjustment method of the light modulator according to the present invention modulates light by lighting pixels according to image information to generate one or more light modulators to generate a projection image, and the projection image from the light modulator. When manufacturing a projection type image display device including a video projection unit for enlarging and projecting, a position adjusting method for adjusting a mounting position of an optical modulator, wherein the optical modulator has two axes orthogonal to each other. Giving a test pattern having a shape having each direction component, projecting the projection image generated by the optical modulator on a projection screen via video projection means, moving the optical modulator in the optical axis direction of the modulated light, and moving At each time, a video signal of the projected image projected on the projection screen is obtained, and based on the video signal, the contrast value of the projected image is calculated in each direction of the two axes. Light modulation Obtains two position coordinates of the corrected position of the optical modulator with the average of the two coordinates, and corrects the position of the light modulator on the basis of the corrected position.
[0012]
In the position adjusting device of the optical modulator of the present invention, and the position adjusting method of the optical modulator of the present invention, in the mounting position adjusting step of the optical modulator when manufacturing the projection type image display device, from the optical modulator, An image of a test pattern having a shape having respective components of two orthogonal axes is projected. This projection image is acquired as a video signal every time the optical modulator is moved in the optical axis direction. From the video signal, the position coordinates of the optical modulator at which the contrast value is maximum are obtained in each of two orthogonal directions of the projection image. These two position coordinates usually do not coincide, and when the liquid crystal panel is arranged at one position coordinate, the projected image is clear in one direction but so-called out-of-focus in the other direction, and a large flare occurs. Comes out. This is due to flare characteristics of the projection lens and quality variations of optical components. Flare is an image blur caused by spherical aberration of a lens (a focal length is different between a central portion and a peripheral portion of the lens). The present invention has been made by paying attention to this phenomenon. In determining the position of the optical modulator that is just in focus (just focus position), it is not necessary to refer only to the contrast value viewed from one direction. The contrast values in two orthogonal directions are taken into account. That is, the correction position of the optical modulator in the optical axis direction is the average of the two position coordinates, and the optical modulator is moved to this position. At this correction position, blurring of the projected image is suppressed on average in both directions of the two orthogonal axes, and the position is adjusted so as to optimize the image quality.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0014]
[First Embodiment]
FIG. 1 is a diagram showing a configuration of a position adjusting device of an optical modulator according to a first embodiment of the present invention, and FIG. 2 shows a configuration of a video projection system centering on a projection screen. In the present embodiment, a case where a liquid crystal projector is manufactured will be specifically described, and the light modulator is a liquid crystal panel 10 (10R, 10G, 10B). The liquid crystal panels 10R, 10G, and 10B are for outputting modulated lights of three primary colors of R, G, and B, respectively. In addition, the dichroic prism 11 and the projection lens 12 are components of the liquid crystal projector, which are usually already integrated at the time of the panel position adjustment step. This position adjusting device adjusts (1) each of the three liquid crystal panels 10R, 10G, and 10B to a position where a projected image can be seen most clearly, and (2) matches the projection positions of the same pixel between each other. The main unit 1 includes an adjustment mechanism 2, a test pattern generator 3, a screen 4, imaging devices 61 to 64, and a control unit 7. Note that this position adjusting device has a function of joining and fixing the liquid crystal panel 10 to the dichroic prism 11 after the position adjustment. The liquid crystal panel 10 is joined by irradiating ultraviolet rays using, for example, an ultraviolet curable adhesive, but the specific configuration is not shown here.
[0015]
The main body 1 has a liquid crystal panel 10 to be adjusted, a dichroic prism 11, and a projection lens 12 mounted thereon. Six-axis operation is performed on each of the liquid crystal panels 10R, 10G, and 10B. A possible adjustment mechanism 2 is provided. That is, the adjusting mechanism 2 is composed of a driving mechanism such as a motor, and as shown in FIG. _Y , The angle about the Y axis as the axis of rotation _x , And Z are rotated in six directions of an angle と す る, and the position can be freely adjusted.
[0016]
The test pattern generator 3 sends a control signal for displaying a predetermined test pattern image to the liquid crystal panel 10 at a predetermined timing under the control of the control unit 7. The test pattern generator 3 gives the liquid crystal panel 10 the test patterns shown in FIGS. These test patterns are given to predetermined pixels at the four corners of the liquid crystal panel 10, and each test pattern image is placed in each of four regions corresponding to the pixel positions in the image projection range 13 (see FIG. 2) by the liquid crystal panel 10. Is displayed.
[0017]
The cross-shaped patterns 31 to 34 shown in FIG. 4 are used at the time of focus adjustment described later, and the L-shaped patterns 41 to 44 shown in FIG. 5 are used at the time of pixel position adjustment described later. It is. Here, the test pattern in FIG. 4 corresponds to a specific example of “a test pattern having a shape having components in each of two orthogonal axes” in the present invention.
[0018]
The screen 4 includes four projection screens 51 to 54 and a screen frame 5 for supporting and fixing these. The projection screens 51 to 54 are provided at four corners of the projection range 13 so as to receive each test pattern. That is, the four regions in each of FIGS. 4 and 5 correspond to the projection planes of the projection screens 51 to 54 as they are.
[0019]
The imaging devices 61 to 64 may be ordinary CCD cameras, each of which is installed so as to face the projection screens 51 to 54, captures images on the projection screens 51 to 54, converts the images to the video signals VS, and controls the control unit. 7 is output.
[0020]
The control unit 7 A / D converts the input video signal VS into luminance data, detects a positional deviation of the liquid crystal panel 10 based on the luminance data, and converts the deviation width into a six-axis control component amount. , The control signal CS is output to each of the adjusting mechanisms 2, and the adjusting mechanism 2 controls the liquid crystal panel 10 to move to the optimum position. Therefore, the control unit 7 is configured by a computer having a memory for storing data. The control unit 7 controls the adjusting mechanism 2 by a method corresponding to the type of the test pattern, and the procedure will be described in detail below. The control unit 7 controls the test pattern generator 3 to switch the test pattern to be generated.
[0021]
Next, the operation of the position adjusting device will be described with reference to FIGS. 6 to 9 are flowcharts showing the procedure for adjusting the position of the optical modulator by the position adjusting device. 9 and 10 are diagrams for explaining a data analysis method of the projected image of the test pattern in FIG.
[0022]
First, when the liquid crystal panel 10, the dichroic prism 11, and the projection lens 12 are installed on the main body 1, the adjusting mechanism 2 moves the liquid crystal panels 10R, 10G, and 10B to the initial positions (Step S1).
[0023]
[Focus adjustment]
Next, the focus position of each liquid crystal panel 10 is adjusted (see FIG. 6). First, each of the liquid crystal panels 10R, 10G, and 10B is separated from the dichroic prism 11 by a predetermined distance in the Z-axis direction (Step S2).
[0024]
Next, while moving the liquid crystal panel 10G in the Z-axis direction, the luminance data of the image of the test pattern in FIG. 4 is sampled as focus data. The test pattern generator 3 gives the test pattern of FIG. 4 to project the green patterns 31 to 34 on the liquid crystal panel 10G (step S3). Thereby, the images of the patterns 31 to 34 are projected on the respective projection screens 51 to 54 in the arrangement shown in FIG.
[0025]
Next, the imaging devices 61 to 64 read the projected images on the projection screens 51 to 54 as the video signal VS (Step S4). The control unit 7 takes in the video signal VS, converts it into luminance data, _X , B _Y Is calculated. As shown in FIG. 10, when the luminance data of each pattern is scanned in the X-axis direction and the Y-axis direction, the average luminance becomes maximum at the pattern position and the maximum contrast value B _X , B _Y Take. Maximum contrast value B _X , B _Y Is the largest and steep peak when the position of the liquid crystal panel 10G in the Z-axis direction matches the focal position, and becomes smaller as the position deviates from the focal point. Then, the obtained maximum contrast value B _X , B _Y Is stored in the memory for each of the patterns 31 to 34 as focus data corresponding to the position in the Z-axis direction (step S5).
[0026]
Next, the liquid crystal panel 10G is brought closer to the dichroic prism 11 by one step (step S6). The sampling step is in units of several microns. If the sampling has not been completed yet (step S7; N), the projection image is read again at this position (step S4), and the operation is continued according to the procedure to acquire the focus data. The focus data is stored for each pattern for each measurement.
[0027]
When the sampling is completed (Step S7; Y), the control unit 7 calculates the just focus position of the liquid crystal panel 10G. FIG. 11 shows sampled focus data, that is, the maximum contrast value B, where the horizontal axis represents the position of the liquid crystal panel 10 in the Z-axis direction. _X , B _Y Is shown on the vertical axis. Maximum contrast value B _X B representing the change in Z-axis direction _XZ And the maximum contrast value B _Y B representing the change in Z-axis direction _YZ Form one peak each. That is, the curve B _XZ Peak position F _X Is the just focus position in the X-axis direction, and the curve B _YZ Peak position F _Y Is the just focus position in the Y-axis direction. Incidentally, these peak positions F _X And peak position F _Y Correspond to the conventional correction position in the Z-axis direction.
[0028]
As shown, the peak position F _X And peak position F _Y Usually do not match. This is due to flare characteristics of the projection lens 12 and quality variations of optical components such as the liquid crystal panel 10, the dichroic prism 11, and the projection lens 12. For example, the liquid crystal panel 10 is moved to the peak position F. _X , The projected image is clear in the X-axis direction, but becomes so-called out of focus in the Y-axis direction, and a large flare appears. Peak position F _Y , The opposite is true.
[0029]
Therefore, here, the peak position F _X And peak position F _Y Average position F _P Is the true just focus position (step S8). This average position F _P In this case, the appearance of flare is reduced on average in both the X-axis direction and the Y-axis direction, and the image quality of the projected image can be optimized.
[0030]
In this way, the just focus positions for the four corners of the liquid crystal panel 10G are calculated corresponding to the patterns 31 to 34. The control unit 7 calculates the Θ from the four just focus positions. _X , Θ _Y The tilt of the direction and the correction position in the Z-axis direction are calculated and sent to the corresponding adjustment mechanism 2 as a control signal CS. The adjustment mechanism 2 corrects the tilt and moves the liquid crystal panel 10G to the correction position in the Z-axis direction (step S9). In this way, the focus of the liquid crystal panel 10G is adjusted. In the present embodiment, the correction position in the Z-axis direction for each liquid crystal panel 10 corresponds to the “first correction position” of the present invention.
[0031]
Next, focus adjustment is performed on the liquid crystal panel 10R in the same manner as the operation on the liquid crystal panel 10G (see FIG. 7). First, the patterns 31 to 34 are projected on the liquid crystal panel 10R (step S10), and the projected images are read as video signals by the imaging elements 61 to 64 (step S11), and focus data for the patterns 31 to 34 is determined based on the video signals. The calculation is performed (step S12). This series of operations is performed while moving the liquid crystal panel 10R in the Z-axis direction to sample focus data for the position in the Z-axis direction (steps S13 and S14). Next, based on the obtained focus data, the peak position F _X And peak position F _Y Average position F _P Is obtained (step S15), and Θ is calculated from the four just focus positions. _X , Θ _Y The tilt of the direction and the correction position in the Z-axis direction are obtained. The adjusting mechanism 2 corrects the position of the liquid crystal panel 10R according to these position correction amounts (Step S16).
[0032]
Next, similarly, focus adjustment is performed on the liquid crystal panel 10B (see FIG. 8). The patterns 31 to 34 are projected on the liquid crystal panel 10B (step S17), the projected images are read as video signals by the imaging elements 61 to 64 (step S18), and focus data for the patterns 31 to 34 is calculated based on the video signals. (Step S19). This series of operations is performed while moving the liquid crystal panel 10B in the Z-axis direction, and focus data for the position in the Z-axis direction is sampled (Steps S20 and S21). Next, from a series of focus data, the peak position F _X And peak position F _Y Average position F _P Is obtained (step S22), and Θ is obtained from the four just focus positions. _X , Θ _Y The tilt of the direction and the correction position in the Z-axis direction are obtained. The adjusting mechanism 2 corrects the position of the liquid crystal panel 10B according to these position correction amounts (Step S23).
[0033]
[Adjustment of pixel position]
Next, the relative positions of the liquid crystal panels 10G, 10R, and 10B are adjusted to match the pixel positions of the projected images of the liquid crystal panels 10 (see FIG. 9). That is, in FIG. 2, the projection range 13 is drawn at the center appropriate position, but before the position adjustment, the projection range from the liquid crystal panel 10 is shifted from this position or the pixel positions of the projected images correspond to each other. Or not. In this step, such a positional shift is detected as a shift amount of the four corners.
[0034]
First, the test pattern generator 3 gives the test pattern of FIG. 5, and the liquid crystal panel 10G projects green patterns 41 to 44 (step S24). The imaging elements 61 to 64 convert each image of the patterns 41 to 44 into a video signal VS and input the video signal VS to the control unit 7. After converting the video signal VS into luminance data, the control unit 7 determines the positions of the patterns 41 to 44, and based on these, determines the X-axis direction, the Y-axis direction and the Y-axis direction so that the projected image is located at the center of the screen. The position correction amount in the Θ direction is calculated. Next, the control unit 7 sends out these position correction amounts to the adjustment mechanism 2 as a control signal CS. The adjusting mechanism 2 adjusts the position of the liquid crystal panel 10G in the X-axis direction, the Y-axis direction, and the Θ direction according to the control signal CS (Step S25).
[0035]
Next, the pixel position of the liquid crystal panel 10R is adjusted to the pixel position of the liquid crystal panel 10G. First, the test pattern generator 3 gives the test pattern of FIG. 5, so that the liquid crystal panel 10R projects red patterns 41 to 44 (step S26).
[0036]
The imaging devices 61 to 64 convert the images of the patterns 41 to 44 projected on the projection screens 51 to 54 into video signals VS, and input the video signals VS to the control unit 7. After converting the video signal VS into luminance data, the control unit 7 determines the position of each image of the patterns 41 to 44. Here, if the obtained position of the red image is shifted from the position of the green image, it is determined that the liquid crystal panel 10R is shifted from the liquid crystal panel 10G in accordance with the shift. Therefore, the position correction amounts of the liquid crystal panel 10R in the X-axis direction, the Y-axis direction, and the Θ direction are calculated based on the shift amounts of the images of the patterns 41 to 44.
[0037]
Further, the control unit 7 sends these position correction amounts as a control signal CS to the adjustment mechanism 2, and the adjustment mechanism 2 changes the position of the liquid crystal panel 10R in the X-axis direction, the Y-axis direction, The adjustment is made in the Θ direction (step S27).
[0038]
Next, the pixel position of the liquid crystal panel 10B is adjusted to the pixel position of the liquid crystal panel 10G. This operation is performed similarly to the adjustment of the liquid crystal panel 10R. First, the blue patterns 41 to 44 are projected on the liquid crystal panel 10B (step S28). next,
The positions of the respective images of the blue patterns 41 to 44 are determined based on the video signal VS, and the shift amounts with respect to the green images are obtained. Subsequently, based on these shift amounts, the position correction amounts of the liquid crystal panel 10B in the X-axis direction, the Y-axis direction, and the Θ direction are calculated, and the position of the liquid crystal panel 10B is adjusted according to the position correction amounts (step S29). ).
[0039]
Next, the test pattern of FIG. 5 is projected on all of the liquid crystal panels 10R, 10G, and 10B, the projected image at this time is read, and the projection positions of the patterns 41 to 44 of each color are determined (step S30). It is confirmed that the position is within the standard (step S31). If any of the R, G, and B pattern positions does not conform to the standard (step S48; N), the liquid crystal panels 10R and 10B are again aligned with the liquid crystal panel 10G as a reference.
[0040]
If the R, G, and B patterns are within the standard (Step S31; Y), each liquid crystal panel 10 is joined to the dichroic prism 11 by joining means (not shown) (Step S32). Thereafter, the adjusting mechanism 2 is moved to the position before the adjustment (Step S33), and the operation is ended.
[0041]
As described above, in the present embodiment, the position of the liquid crystal panel 10 is adjusted using the test pattern shown in FIG. _X , Peak position F _Y And find their average position F _P Is set as a true just focus position, the focus adjustment is performed. Therefore, the position of the liquid crystal panel 10 in the Z-axis direction is optimized so that the contrast of the image is averagely good in each direction. Therefore, the liquid crystal panel 10 can be adjusted to a state where a clear image can be obtained.
[0042]
Next, modified examples and applied examples of the above-described embodiment will be described by assigning the same reference numerals to the same components as those of the embodiment.
[0043]
(Modification)
In the focus adjustment step in the above embodiment, the maximum contrast value B of each pattern image _X , B _Y Has been described as the focus data, but the focus data can also be obtained as follows.
[0044]
As described above, when the luminance of the pattern image is scanned in the X-axis and Y-axis directions, a luminance distribution having a peak at the position of the pattern image in each direction is obtained. As shown in FIG. 12, the shape of this luminance distribution becomes steeper as the position of the liquid crystal panel 10 in the Z direction approaches the just focus position, and becomes gentler as the position is further away from the just focus position. Therefore, when a certain threshold value is determined, the range in which the brightness value is larger than the threshold value becomes narrower (width Wx1, Wy1) as the position is closer to the just focus position, and becomes wider (width Wx2, width Wy2) as the position becomes farther. In this modified example, utilizing this, the luminance is set to the threshold B ₀ Is set, and the luminance value is set to the threshold B ₀ A larger position width (flare width) is calculated and used as focus data.
[0045]
FIG. 13 shows a flare width change in the X-axis direction and a flare width change in the Y-axis direction with respect to the position of the liquid crystal panel 10 in the Z-axis direction. When the liquid crystal panel 10 is moved in the Z-axis direction, the flare width in the X-axis direction _XZ And the flare width in the Y-axis direction is _YZ It changes like In each direction, the flare width becomes smallest during just focus. Here, the Z-direction position F at which the flare width is minimized _X , F _Y Are obtained as just focus positions in the X-axis direction and the Y-axis direction, respectively, and the average position F _P Is the actual just focus position. Thereby, the position where the average flare in the X-axis direction and the Y-axis direction becomes minimum can be set as the just focus position.
[0046]
[Application example]
In the pixel position adjustment step in the above embodiment, the adjustment is performed based on the relative distance between the R, G, and B projection images. The chromatic aberration of the projection lens 12 affects the relative distance. That is, the refractive index of the optical material differs depending on the wavelength, and the convex lens of glass has a property that the focal length of blue light is shorter than the focal length of red light. Therefore, as shown in FIG. 14, in each of the R, G, and B images projected from the projection lens 12, the pattern image PR by the red light 50R is the smallest, and the pattern image PB by the blue light 50B is the largest. Since the measured value of the relative distance includes such chromatic aberration, it is not possible to correctly match the pixel positions of each other by simply matching one end of each image. Therefore, in this application example, the position adjustment is performed in consideration of the chromatic aberration.
[0047]
However, since the magnitude of chromatic aberration also changes due to manufacturing variations of the projection lens 12, it is not possible to preset a shift due to aberration between pattern images. Therefore, after the position adjustment of the liquid crystal panel 10G, when obtaining the correction positions of the liquid crystal panels 10R and 10B, the final adjustment is performed by the following calculation.
[0048]
The coordinates of the green patterns 41 to 44 by the liquid crystal panel 10G are (gx1, gy1), (gx2, gy2), (gx3, gy3), (gx4, gy4), and the coordinates of the red patterns 41 to 44 by the liquid crystal panel 10R. Are (rx1, ry1), (rx2, ry2), (rx3, ry3), and (rx4, ry4). At this time,
(Gx1−rx1) + (gx2−rx2) + (gx3−rx3) + (gx4−rx4) = 0
Then, the image projection position of the liquid crystal panel 10R in the X-axis direction is adjusted to the center on average with respect to the liquid crystal panel 10G. Also,
(Gy1-ry1) + (gy2-ry2) + (gy3-ry3) + (gy4-ry4) = 0
Then, the image projection position of the liquid crystal panel 10R in the Y-axis direction is adjusted to the center with respect to the liquid crystal panel 10G on average. Thereby, the correction position of the liquid crystal panel 10R can be obtained without the influence of the chromatic aberration. It should be noted that the same operation can also be performed on the liquid crystal panel 10B to obtain a correction position from which the influence of chromatic aberration has been eliminated. As a result, pixel registration (registration) can be performed with higher accuracy, and color misregistration can be suppressed.
[0049]
[Second embodiment]
Next, a second embodiment will be described. In the present embodiment, focus adjustment and pixel position adjustment are simultaneously performed on a plurality of liquid crystal panels, but the basic operation on each liquid crystal panel is the same as in the first embodiment. . Therefore, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.
[0050]
In the position adjustment device used here, the test pattern generator 3 gives the test pattern shown in FIG. 15 to the liquid crystal panel 10, gives the test pattern shown in FIG. 16 when adjusting the focus, and gives the test pattern shown in FIG. 17 when adjusting the pixel position. The first embodiment is different from the first embodiment except that the control unit 7 performs arithmetic processing according to the test patterns in FIGS. 15 to 17 and performs control to simultaneously correct the positions of the plurality of liquid crystal panels 10. The configuration is the same as that of the first embodiment.
[0051]
That is, the test pattern generator 3 gives the three types of test patterns shown in FIGS. 15, 16, and 17 to the liquid crystal panel 10. The patterns 21 to 24 shown in FIG. 15 are sequentially given to each liquid crystal panel 10, and the outline (the boundary between the lit pixel in the test pattern and the non-lit pixel outside the test pattern) is used as an index. Is used to roughly adjust the position on the XY plane.
[0052]
The test pattern shown in FIG. 16 is used at the time of focus adjustment, and actually shows a state in which the patterns of FIGS. 18, 19, and 20 given to the liquid crystal panels 10G, 10R, and 10B are superimposed. It was done. The patterns in FIGS. 18 to 20 are arranged in mutually different pixel regions, and simultaneously apply patterns R31 to R34 to the liquid crystal panel 10R, patterns G31 to G34 to the liquid crystal panel 10G, and patterns B31 to B34 to the liquid crystal panel 10B. Are synthesized on the projection screens 51 to 54, and a projected image as shown in FIG. 16 is displayed.
[0053]
In the test pattern of FIG. 16, the distance between the patterns is previously defined on the pixel position in order to prevent the pattern images from overlapping and interfering with each other due to the displacement of the liquid crystal panel 10. FIG. 21 representatively shows an example of this by a pattern in the upper right region. The interval between the pattern R31 and the pattern G31 is defined on the left and right by the offset D1, and the interval between the pattern G31 and the pattern B31 is defined on the upper and lower sides by the offset D2. Furthermore, by arranging these patterns R31, G31, and B31 at the vertices of an equilateral triangle, the distance between them becomes equal, and interference between the patterns can be avoided more effectively. Here, the test pattern in FIG. 16 corresponds to a specific example of the test pattern “having a shape having each direction component of two orthogonal axes” in the present invention.
[0054]
The test pattern shown in FIG. 17 is used at the time of pixel position adjustment (registration). The test pattern in FIG. 17 is also generated by simultaneously applying the patterns R41 to R44, the patterns R41 to R44, and the patterns R41 to R44 to the liquid crystal panels 10R, 10G, and 10B, respectively, like the test pattern in FIG. . Also in the test pattern of FIG. 17, the distance between the patterns is relatively defined by the pixel position. FIG. 22 representatively shows one example of this by a pattern in the upper right area. In the pattern R41, the distance in the X-axis direction is defined by the offset W11 with respect to the pattern G41, and the distance in the Y-axis direction is defined by the offset W12. In the pattern B41, the distance in the X-axis direction is defined by the offset W21 with respect to the pattern G41, and the distance in the Y-axis direction is defined by the offset W22.
[0055]
Next, the operation of the position adjusting device will be described with reference to FIGS. FIGS. 23 to 26 are flowcharts showing a procedure for adjusting the position of the optical modulator by the position adjusting device. FIG. 27 is a diagram for explaining a data processing method for the projected image of the test pattern in FIG.
[0056]
First, when the liquid crystal panel 10, the dichroic prism 11, and the projection lens 12 are installed on the main body 1, the adjusting mechanism 2 moves the liquid crystal panels 10R, 10G, and 10B to the initial positions (Step S1).
[0057]
(Coarse adjustment)
Next, the position of each liquid crystal panel 10 is roughly adjusted. First, the test pattern generator 3 gives the test pattern of FIG. 15 to the liquid crystal panel 10G. Thereby, the liquid crystal panel 10G projects the green patterns 21 to 24 (Step S2).
[0058]
The patterns 21 to 24 are projected toward the projection screens 51 to 54, respectively. On the other hand, the imaging devices 61 to 64 capture the images on the projection screens 51 to 54, respectively, and send the images to the control unit 7 as video signals VS. Input (step S3). The control unit 7 obtains luminance data from the video signal VS, and based on the luminance data, determines whether or not the contours of the patterns 21 to 24 are projected on predetermined positions of the projection screens 51 to 54 (step S4). . Here, the patterns 21 to 24 are bright because they display a large pixel area, and even if the image is slightly out of focus and out of focus, the outline can be determined to some extent. In this way, coarse position identification is performed on the liquid crystal panel 10G.
[0059]
If the contours of the patterns 21 to 24 have not been projected at the predetermined positions (step S4; N), the control unit 7 calculates the amount of displacement in the X-axis direction, the Y-axis direction, and the Θ direction, and adjusts them as control signals. Output to mechanism 2. The adjusting mechanism 2 moves the liquid crystal panel 10G in the X-axis direction, the Y-axis direction, and the Θ direction according to the control signal, and adjusts the position (Step S5). Thereafter, the images on the projection screens 51 to 54 are read again by the imaging elements 61 to 64 (step S3), and the above-described series of operations is performed.
[0060]
When the contours of the patterns 21 to 24 have been projected at the predetermined positions (step S4; Y), the test pattern generator 3 gives the test pattern of FIG. 15 to the liquid crystal panel 10R based on the control of the control unit 7. . Thereby, the liquid crystal panel 10R projects the red patterns 21 to 24 (Step S6).
[0061]
The coarse adjustment of the position of the liquid crystal panel 10R is performed in the same procedure as in the case of the liquid crystal panel 10G described above (steps S7 to S9). After the coarse adjustment of the liquid crystal panel 10R is thus completed (Step S8; Y), next, the coarse adjustment is performed on the liquid crystal panel 10B. The procedure is the same as that of the liquid crystal panel 10R described above (steps S10 to S13).
[0062]
[Focus adjustment]
Next, the focal position of each liquid crystal panel 10 is adjusted. In this process, the test pattern generator 3 gives the test patterns of FIGS. 18, 19, and 20 to each of the liquid crystal panels 10G, 10R, and 10B.
[0063]
First, the test pattern generator 3 gives the test pattern of FIG. 18, and the liquid crystal panel 10G projects green patterns G31 to G34 (step S14). Next, the images of the patterns G31 to G34 on the projection screens 51 to 54 are taken into the control unit 7 as the video signals VS by the imaging elements 61 to 64. After converting the video signal VS into luminance data, the control unit 7 determines the position of each of the patterns G31 to G34 and stores these in the memory as position data (step S15).
[0064]
This operation is similarly performed on the liquid crystal panels 10R and 10G. At this time, the test pattern shown in FIG. 19 is given to the liquid crystal panel 10R, red patterns R31 to R34 are projected, and the positions are stored in the memory (steps S16 and S17). The test pattern shown in FIG. 20 is given to the liquid crystal panel 10B, blue patterns B31 to B34 are projected, and the positions are stored in a memory (steps S18 and S19).
[0065]
Next, each of the liquid crystal panels 10R, 10G, and 10B is separated from the dichroic prism 11 by a predetermined distance in the Z-axis direction (Steps S20 to S22). Next, the test patterns of FIGS. 18 to 20 are simultaneously applied to each of the liquid crystal panels 10R, 10G, and 10B, and patterns R31 to R34, patterns G31 to G34, and patterns B31 to B34 are projected (steps S23 to S25). . Thereby, each pattern image is projected on the projection screens 51 to 54 in the arrangement shown in FIG.
[0066]
Next, while simultaneously moving each of the liquid crystal panels 10R, 10G, and 10B in the Z-axis direction, the luminance data of each pattern is sampled as focus data. At this time, the projected images on the projection screens 51 to 54 are as shown in FIG. 16, and these are read by the imaging elements 61 to 64 as the video signal VS (step S26).
[0067]
After taking in the video signal VS and converting it into luminance data, the control unit 7 separates and extracts luminance data for each pattern from the luminance data corresponding to the test pattern in FIG. 16 (step S27). FIG. 27 shows the situation using a projection image on the projection screen 51 as an example. From the luminance data corresponding to the projection image, luminance data corresponding to the minute areas A1 to A3 centered on the patterns R31, G31, and B31 are extracted and stored separately in the memory. The small areas A1 to A3 are set to a size such that the luminance data of each pattern does not interfere with each other based on the position data of the patterns R31, G31, and B31 previously stored in the memory. In this manner, three types of luminance data of patterns R31, G31, and B31 are obtained from one piece of luminance data obtained by imaging.
[0068]
Next, the control unit 7 sets a maximum contrast value B for each pattern. _X , B _Y Are calculated and stored in the memory as focus data corresponding to the position in the Z-axis direction (steps S28 to S30).
[0069]
Next, each of the liquid crystal panels 10R, 10G, and 10B is brought closer to the dichroic prism 11 by one step (Steps S31 to S33). If the sampling has not been completed yet (step S34; N), the projection image is read again at this position (step S26), and focus data is acquired.
[0070]
When the sampling is completed (Step S34; Y), the control unit 7 sets the peak position F for each pattern. _X And peak position F _Y Average position F _P To calculate a true just focus position (steps S35 to S37).
[0071]
Thus, the just-focus positions at the four corners are calculated for each of the liquid crystal panels 10R, 10G, and 10B. The control unit 7 determines the position of each liquid crystal panel 10 from four just focus positions _X , Θ _Y The tilt of the direction and the correction position in the Z-axis direction are calculated and sent to the corresponding adjustment mechanism 2 as a control signal CS. The adjustment mechanism 2 simultaneously performs the tilt correction and the movement to the correction position in the Z-axis direction for the liquid crystal panels 10R, 10G, and 10B (steps S38 to S40).
[0072]
[Adjustment of pixel position]
Next, the relative position of each liquid crystal panel 10 is adjusted (registration). In this step, the test pattern generator 3 gives the liquid crystal panels 10G, 10R, and 10B a pattern having the same sign at the end of the test patterns in FIG.
[0073]
First, the test pattern generator 3 gives the patterns G41 to G44, and the liquid crystal panel 10G projects the green patterns G41 to G44 (step S41). The imaging elements 61 to 64 convert each image of the patterns G41 to G44 into a video signal VS and input the video signal VS to the control unit 7. After converting the video signal VS into luminance data, the control unit 7 determines each position of the patterns G41 to G44. Further, based on these, the position correction amounts in the X-axis direction, the Y-axis direction, and the Θ direction are calculated so that the projection image is located at the center of the screen. Next, the control unit 7 sends out these position correction amounts to the adjustment mechanism 2 as a control signal CS. The adjusting mechanism 2 adjusts the position of the liquid crystal panel 10G in the X-axis direction, the Y-axis direction, and the Θ direction according to the control signal CS (Step S42).
[0074]
Next, the test pattern generator 3 gives a test pattern, so that the liquid crystal panels 10R and 10B respectively project red patterns R41 to R44 and blue patterns B41 to B44 (steps S43 and S44). At this time, the test patterns of FIG. 17 are projected on the projection screens 51 to 54, and the imaging elements 61 to 64 collectively convert the images of the respective patterns into the video signals VS and input them to the control unit 7.
[0075]
After converting the video signal VS into luminance data, the control unit 7 determines each position of the patterns R41 to R44. The relative positions of the patterns R41 to R44 with respect to the patterns G41 to G44 are already defined by the pixel positions as shown in FIG. 22, and if the projected image is shifted from the specified relative position, the liquid crystal panel is correspondingly shifted. It turns out that 10R is located at a position shifted from the liquid crystal panel 10G. Therefore, the position correction amounts of the liquid crystal panel 10R in the X-axis direction, the Y-axis direction, and the Θ direction are calculated from the shift amounts of the patterns R41 to R44 based on the specified relative positions (offsets W11, W12).
[0076]
The control unit 7 also performs the same calculation for the patterns B41 to B44 in the same manner as the patterns R41 to R44, and calculates the liquid crystal based on the shift amounts of the patterns B41 to B44 based on the relative positions (offsets W21 and W22) shown in FIG. The position correction amounts of the panel 10B in the X-axis direction, the Y-axis direction, and the Θ direction are calculated.
[0077]
The control unit 7 sends these position correction amounts to the adjustment mechanism 2 as control signals CS, and the adjustment mechanism 2 changes the positions of the liquid crystal panels 10R and 10B in the X-axis direction and the Y-axis direction according to the control signal CS. The adjustment is made in the directions Θ and Θ (steps S45 and S46).
[0078]
Next, the projected images are read again, the projection positions of the patterns R41 to R44, the patterns G41 to G44, and the patterns B41 to B44 are determined (step S47), and it is confirmed that the pixel position of each pattern is within the standard (step S47). S48). If the R, G, and B patterns do not conform to the standard (step S48; N), the liquid crystal panels 10R and 10B are again aligned with the liquid crystal panel 10G as a reference.
[0079]
If the R, G, and B patterns are within the standard (Step S48; Y), each liquid crystal panel 10 is joined to the dichroic prism 11 by joining means (not shown) (Step S49). Thereafter, the adjusting mechanism 2 is moved to the position before the adjustment (Step S50), and the operation is ended.
[0080]
As described above, in the present embodiment, when adjusting the position of the liquid crystal panel 10, the liquid crystal panels 10R, 10G, and 10B are simultaneously projected with the patterns arranged in different pixel regions, so that the liquid crystal is projected onto the projection screens 51 to 54. The projection images from the panels 10R, 10G, and 10B are projected so as not to overlap with each other, and the image pickup devices 61 to 64 simultaneously convert the respective projection images of R, G, and B into one image and simultaneously convert them into the video signal VS. Therefore, the position information of the liquid crystal panels 10R, 10G, and 10B is obtained at one time. Since the R, G, and B projection images are arranged so as not to overlap with each other, interference with other color components does not occur. Further, in the focus adjustment step, data is separated and extracted for each pattern image from the video signal VS, and a position correction amount for each liquid crystal panel 10 is obtained based on the data. In the pixel position adjustment step, the video signal VS is extracted from the video signal VS. Since the relative distance between the pattern images is detected and the position is adjusted based on the relative distance, in both of the focus adjustment and the adjustment of the pixel position, the acquisition of the position information for the liquid crystal panels 10R, 10G, and 10B and the correction of the position correction amount are performed. Calculation and position adjustment can be performed simultaneously. Therefore, in addition to the effects of the above-described first embodiment, the time required for adjusting the position of the liquid crystal panel can be shortened without significant modification from the conventional device, and the liquid crystal projector can be manufactured efficiently. Play.
[0081]
In the focus adjustment step, the data for each pattern image is obtained by separating and extracting the data from one image signal. Therefore, the area indicated by the data of each pattern image, that is, the image processing range becomes narrower than before, and the control unit 7, the calculation processing time is reduced. Therefore, the time required for adjustment can be reduced.
[0082]
In addition, not only the cross-shaped test pattern shown in FIG. 16 is used for focus adjustment, but also the test patterns shown in FIGS. 15, 16 and 17 are selectively used for each of the steps of coarse adjustment, focus adjustment and pixel position adjustment. Therefore, a test pattern having a shape suitable for the purpose of each step is selected, and optimal position correction can be performed on the liquid crystal panel 10.
[0083]
Note that the present invention is not limited to the above-described embodiment, modifications, and application examples, and various modifications can be made. For example, in the above-described embodiment, only the cross shape is illustrated as a test pattern of “a shape having each direction component of two orthogonal axes”. However, other than the above, a corresponding shape such as a T-shape or an L-shape may be used. Of course it is good. Further, the modified examples and the applied examples can be applied to the second embodiment, and may be applied not only individually but also in combination.
[0084]
Furthermore, in the above-described embodiment, the case of manufacturing a liquid crystal projector has been described. However, this is merely an example, and the present invention can be applied to the case of manufacturing a projector including a light modulator other than a liquid crystal panel. The configuration of the projector may be not only a three-panel type but also a single-panel type. In the above embodiment, the case of the front projection type in which an image is projected toward a directly facing screen has been described. A rear projection method for projecting an image on the back side of the screen by using the same may be used.
[0085]
【The invention's effect】
As described above, according to the position adjusting device and the position adjusting method of the present invention, when adjusting the mounting position of the optical modulator when manufacturing the projection type image display device, the position orthogonal to the optical modulator is adjusted. A test pattern having a shape having each direction component of the axis is given, and a projection image generated by the light modulator is projected on a projection screen via video projection means, and the light modulator is moved in the optical axis direction of the modulated light. The video signal of the projected image projected on the projection screen is acquired at each movement, and the contrast value of the projected image is calculated in each of the two axes based on the video signal. The position coordinates of the optical modulator are determined based on the average of the two position coordinates of the optical modulator, and the average of the two position coordinates is determined. The position of the optical modulator is corrected based on the corrected position. Is Blur in both the two orthogonal axes is suppressed on the average. As a result, optimal focus adjustment becomes possible.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a position adjustment device according to a first embodiment of the present invention.
FIG. 2 is a configuration diagram of a video projection system of the position adjustment device shown in FIG.
FIG. 3 is a diagram showing a position adjustment direction of a liquid crystal panel by the adjustment mechanism shown in FIG.
FIG. 4 is a diagram showing a test pattern given to a liquid crystal panel by the test pattern generator shown in FIG. 1 during focus adjustment in the first embodiment.
FIG. 5 is a diagram showing a test pattern given to the liquid crystal panel by the test pattern generator shown in FIG. 1 in adjusting a pixel position in the first embodiment.
FIG. 6 is a flowchart of a position adjustment procedure of the optical modulator according to the first embodiment.
FIG. 7 is a flowchart of a position adjustment procedure following FIG. 12;
FIG. 8 is a flowchart of a position adjustment procedure following FIG. 7;
FIG. 9 is a flowchart of a position adjustment procedure following FIG. 8;
FIG. 10 is a diagram for explaining an analysis method applied to the test pattern image of FIG. 4 during focus adjustment.
FIG. 11 is a diagram illustrating an analysis procedure following FIG. 10;
FIG. 12 is a diagram for explaining a data analysis method of a projection video according to a modification of the first embodiment.
FIG. 13 is a diagram illustrating an analysis procedure following FIG. 12;
FIG. 14 is an explanatory diagram of chromatic aberration during adjustment of a pixel position according to an application example of the first embodiment.
FIG. 15 is a diagram showing a test pattern given to the liquid crystal panel by the test pattern generator shown in FIG. 1 at the time of coarse adjustment in the second embodiment.
FIG. 16 is a diagram of a test pattern given to a liquid crystal panel by the test pattern generator shown in FIG. 1 during focus adjustment in the second embodiment.
FIG. 17 is a diagram of a test pattern given to the liquid crystal panel when the pixel position is adjusted by the test pattern generator shown in FIG. 1 in the second embodiment.
18 is a diagram showing only a green projection pattern among the test patterns shown in FIG.
FIG. 19 is a diagram showing only a red projection pattern of the test patterns shown in FIG. 16;
20 is a diagram showing only a blue projection pattern among the test patterns shown in FIG. 16;
FIG. 21 is a diagram for explaining a positional relationship between patterns of each color of the test pattern shown in FIG.
22 is a diagram for explaining a positional relationship between patterns of each color of the test pattern shown in FIG.
FIG. 23 is a flowchart of a position adjustment procedure of the optical modulator according to the second embodiment.
FIG. 24 is a flowchart of a position adjustment procedure following FIG. 23;
FIG. 25 is a flowchart of a position adjustment procedure following FIG. 24;
FIG. 26 is a flowchart of a position adjustment procedure following FIG. 25;
FIG. 27 is a diagram for explaining a data processing method for a projected image of the test pattern of FIG. 16;
FIG. 28 is a main part configuration diagram of a general liquid crystal projector.
FIG. 29 is a schematic configuration diagram of a conventional position adjusting device.
FIG. 30 is a view for explaining a conventional position adjustment method disclosed in Patent Document 1.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Body part, 2 ... Adjustment mechanism, 3 ... Test pattern generator, 4 ... Screen, 5 ... Screen frame, 51-54 ... Projection screen, 61-64 ... Image sensor, 7 ... Control part, 10, 10R, 10G , 10B: liquid crystal panel, 11: dichroic prism, 12: projection lens, 13: projection range, 21 to 24, 31 to 34, R31 to R34, G31 to G34, B31 to B34, 41 to 44, R41 to R44, G41 ... G44, B41 to B44 ... pattern, VS ... video signal, CS ... control signal, D1, D2, W11, W12, W21, W22 ... offset, A1 to A3 ... minute area, B _X ... Maximum contrast value in the X-axis direction, B _Y ... Maximum contrast value in the Y-axis direction, F _X ... Peak position (just focus position) in the X axis direction, F _Y ... Peak position (just focus position) in the Y axis direction, F _P ... True just focus position, Wx1, Wx2, Wy1, Wy2 ... Flare width.

Claims (7)

A configuration including one or a plurality of light modulators that modulate light by lighting pixels according to image information to generate a projection image, and image projection means for enlarging and projecting the projection image from the light modulator. When manufacturing a projection type image display device is a position adjustment device for adjusting the mounting position of the optical modulator,
Position adjusting means for adjusting the position of the optical modulator,
Test pattern generating means having a function of providing the optical modulator with a test pattern having a shape having components in each of two orthogonal axes;
A projection screen on which a test pattern image generated by the light modulator is projected via the video projection unit,
Imaging means for capturing an image on the projection screen and converting the image to a video signal,
When a projection image of a test pattern having a shape having each of the two orthogonal axes is projected on the projection screen, the position adjustment unit moves the optical modulator in the optical axis direction of the modulated light. While controlling the optical modulator, obtains a video signal corresponding to the projected image each time the optical modulator moves, and calculates a contrast value of the projected image in each of the two orthogonal axes based on the video signal. Then, two position coordinates of the optical modulator at which each of these two types of contrast values become maximum are obtained, and an average of the two position coordinates is used as a first correction position of the optical modulator, and the first correction position is obtained. Control means having a function of controlling the position adjustment means based on the correction position. 2. The position adjusting device of an optical modulator according to claim 1, wherein the test pattern generating means gives a cross-shaped pattern as a test pattern having a shape having components in each of two orthogonal axes. The test pattern generator further provides a rectangular pattern and an L-shaped pattern to the plurality of optical modulators,
The control means,
When an image signal corresponding to the rectangular pattern is obtained, a second set position for coarsely adjusting the positions of the plurality of optical modulators is obtained based on the image signal, and the L (L (3) When a video signal corresponding to a character-shaped pattern is obtained, a third set position is obtained based on the video signal so as to adjust a relative position between the plurality of optical modulators. The position adjusting device for an optical modulator according to claim 2. The test pattern generator provides a test pattern having a shape having the respective components of the two orthogonal axes to different pixel regions of each of the plurality of light modulators,
The imaging means collectively captures a projection image of a test pattern having a shape having the respective components of the two orthogonal axes projected onto different regions of the projection screen for each of the light modulators, and collectively captures a video signal. To
The control means acquires a video signal corresponding to the plurality of projection images, separates and extracts a video signal for each of the projection images from the video signal, and analyzes the projection image based on the extracted video signal. Calculating the first correction position for each of the plurality of optical modulators,
2. The position adjusting device for an optical modulator according to claim 1, wherein the position adjusting unit adjusts each position of the plurality of optical modulators to the first correction position at the same time. A configuration including one or a plurality of light modulators that modulate light by lighting pixels according to image information to generate a projection image, and image projection means for enlarging and projecting the projection image from the light modulator. When manufacturing a projection type image display device is a position adjustment method for adjusting the mounting position of the light modulator,
The light modulator is provided with a test pattern having a shape having two orthogonal directional components, and the projection image generated by the light modulator is projected on a projection screen via the video projection unit.
Move the light modulator in the direction of the optical axis of the modulated light, to obtain a video signal of the projected image projected on the projection screen for each movement,
On the basis of the video signal, a contrast value of the projected image is calculated in each of the two axes, and two position coordinates of the optical modulator at which each of the two contrast values is maximum are obtained. A position adjustment method for an optical modulator, wherein an average of two position coordinates is used as a first correction position of the optical modulator, and the position of the optical modulator is corrected based on the first correction position. A video signal corresponding to the rectangular pattern is obtained by projecting a rectangular pattern on each of the light modulators, and a second correction position is obtained based on the video signal corresponding to the rectangular pattern. Performing coarse adjustment of each position of the optical modulator by the second correction position;
By projecting a cross-shaped pattern on each of the optical modulators as a test pattern having a shape having each direction component of the two orthogonal axes, a video signal corresponding to the cross-shaped pattern is obtained and the first signal is obtained. Is calculated, and each position of the optical modulator is corrected to the first correction position,
By projecting an L-shaped pattern on each of the optical modulators, a video signal corresponding to the L-shaped pattern is obtained, and the video signal corresponding to the L-shaped pattern is obtained. The position adjustment method for an optical modulator according to claim 5, wherein a third correction position is obtained based on a video signal, and a relative position between the optical modulators is adjusted based on the third correction position. . A test pattern having a shape having each direction component of the two orthogonal axes is provided to mutually different pixel regions of each of the plurality of light modulators,
A projection image of a test pattern having a shape having each direction component of the two orthogonal axes projected onto different regions of the projection screen for each light modulator is collectively captured and converted into a video signal,
By separating and extracting the video signal for each of the projection images from the video signals corresponding to the plurality of projection images, and analyzing the projection image based on the extracted video signals, the plurality of light modulators for each of the Find the first correction position,
6. The position adjusting method for an optical modulator according to claim 5, wherein the positions of the plurality of optical modulators are simultaneously corrected to the first correction position.

Images