JP2012185406A - Projection type display device and control method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance accuracy of pixel shift correction while suppressing complication of an operation in a projection type display device.SOLUTION: A projection type display device comprises: a plurality of image forming panel sections disposed corresponding to color light of a plurality of colors; a panel driving section for driving each of the plurality of image forming panel sections such that the color light is modulated to image light corresponding to an image signal in an image forming region of each of the plurality of image forming panel sections; a synthesizing section for synthesizing the image light having been output; and a projection optical system for projecting the image light having been synthesized. The projection type display device further comprises: an instructions acquiring section for acquiring adjustment point instructions that select at least one point of four vertices constituting a rectangular shape in the image forming region and vertices on an outer circumference of an inner region set in the image forming region as an adjustment point, and adjustment amount instructions that individually instruct an adjustment amount of a relative shift between image light of an adjustment color and image light of a reference color for each adjustment point; and a shift correcting section for correcting the image signal corresponding to the adjustment color on the basis of the adjustment point instructions and the adjustment amount instructions.

Description

  The present invention relates to a projection display device and a control method for the projection display device.

  Projection display devices (projectors) that display images on projection surfaces such as screens and wall surfaces are widely used. As the projection display device, for example, there is a three-plate projection display device including three liquid crystal panels corresponding to the three primary colors of light (red (R), green (G), and blue (B)). A three-plate projection display device separates white light emitted from a light source into three color lights of red, green, and blue using a dichroic mirror, and converts the color light into image light corresponding to an image signal in each liquid crystal panel. The modulated image light output from the three liquid crystal panels is combined by the dichroic prism, and the combined image light is projected onto the projection plane by the projection optical system. The three-plate projection display device is advantageous in terms of brightness and resolution as compared with a single-plate projection display device having only one liquid crystal panel.

  In the three-plate projection display device, the relative displacement of the image light of each color (hereinafter referred to as “pixel”) constituting the projected image light due to the relative displacement of the mounting positions of the three liquid crystal panels and the magnification aberration of the projection optical system. May also occur). In a three-plate projection display device, a technique for correcting pixel shift by correcting an image signal supplied to a liquid crystal panel corresponding to an adjustment color in which pixel shift has occurred with respect to a reference color is known. (For example, refer to Patent Documents 1 and 2).

JP-A-8-201937 Japanese Patent Laid-Open No. 10-260389

  However, the conventional pixel deviation correction involves moving the entire adjustment color image horizontally or vertically with respect to the reference color image, and there is room for improvement in terms of the accuracy of pixel deviation correction. In addition, a technique for setting a plurality of grid-like areas on the liquid crystal panel, obtaining an instruction of an adjustment amount for each grid point, and correcting pixel shift in a region around each grid point with the specified adjustment quantity However, in this case, it is necessary for the operator to indicate the adjustment amount of each grid point, and the operation is complicated.

  This problem is not limited to a three-plate projection display device including three liquid crystal panels, but is a problem common to a projection display device including a plurality of image forming panel units corresponding to a plurality of color lights.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to improve the accuracy of pixel shift correction while suppressing complication of operation in a projection display device.

  In order to solve at least a part of the above problems, the present invention can be realized as the following forms or application examples.

Application Example 1 A projection display apparatus that displays an image on a projection surface,
An image acquisition unit for acquiring an image signal;
A color light output unit for outputting multiple colors of color light;
A plurality of image forming panel portions each having an image forming area that is provided corresponding to each of the plurality of colors of light and includes a plurality of pixels;
A panel driving section that drives each of the image forming panel sections so that the color light is modulated into image light corresponding to the image signal in the image forming area;
A combining unit that combines the image light output from each of the image forming panel units;
A projection optical system for projecting the combined image light;
At least one point among the four vertices forming a rectangle in the image forming area of each image forming panel and the outer peripheral vertex of the polygonal inner area set in the image forming area is selected as an adjustment point. Adjustment point instruction, and an adjustment amount for individually indicating the adjustment amount of relative deviation between the image light of the adjustment color selected from the plurality of colors and the image light of the reference color different from the adjustment color for each of the adjustment points An instruction acquisition unit for acquiring instructions;
A deviation correction unit that corrects a relative deviation of the image light of the adjustment color with respect to the image light of the reference color by correcting the image signal corresponding to the adjustment color based on the adjustment point instruction and the adjustment amount instruction; A projection display device comprising:

  In this projection display device, at least one point is adjusted among the four vertices forming a rectangle in the image forming area of each image forming panel unit and the outer peripheral vertex of the polygonal inner area set in the image forming area. An adjustment point instruction to be selected as a point and an adjustment amount instruction for individually instructing an adjustment amount of the relative deviation between the image light of the adjustment color and the image light of the reference color for each adjustment point are acquired. Based on the instruction, the image signal corresponding to the adjustment color is corrected, and the relative shift of the adjustment color image light with respect to the reference color image light is corrected. For this reason, it is possible to perform pixel shift correction for the entire image only by instructing adjustment amounts for the four vertices of the rectangle in the image forming area and the outer peripheral vertices of the inner area, and at the same time, the outer peripheral line of the image forming area The accuracy of pixel shift correction can be improved not only in the vicinity but also in the inner region of the image forming area, and the accuracy of pixel shift correction can be further improved while suppressing the complexity of the operation.

Application Example 2 The projection display device according to Application Example 1, further including:
A non-volatile storage unit,
The instruction acquisition unit acquires a confirmation instruction for the adjustment amount at the adjustment point,
The deviation correction unit is a projection display device that stores information specifying the adjustment amount at the adjustment point in the nonvolatile storage unit when the confirmation instruction is acquired.

  In this projection display device, the processing can be simplified and speeded up as compared with the case where information for specifying the adjustment amount is stored in the nonvolatile storage unit every time the adjustment amount instruction is acquired.

Application Example 3 The projection display device according to Application Example 1 or Application Example 2,
The misalignment correction unit is configured such that a polygonal region having one of the four vertices of the rectangle in the image forming region and an outer peripheral vertex of the inner region as a vertex, and the adjustment point of the image forming region according to the adjustment amount instruction A projection display device that corrects the image signal using a conversion that associates an area corresponding to the polygonal area in an adjustment area that has been moved by an instructed adjustment amount.

  In this projection display device, pixel shift correction of the entire image can be executed based on the adjustment amount instructed for at least one of the four vertices of the rectangle in the image forming region and the outer peripheral vertex of the inner region.

Application Example 4 The projection display device according to any one of Application Examples 1 to 3, further comprising:
An image storage unit that stores a pattern image signal representing a pattern image indicating the positions of the four vertices of the rectangle in the image forming region and the positions of the outer peripheral vertices of the inner region;
The deviation correction unit supplies the pattern image signal as the image signal to the panel driving unit for at least the adjustment color and the reference color, and the adjustment color based on the adjustment point instruction and the adjustment amount instruction. A projection display device that corrects the pattern image signal corresponding to the above.

  In this projection display device, the pixel shift correction result based on the adjustment point instruction and the adjustment amount instruction is immediately reflected in the projected pattern image. Therefore, the adjustment point instruction and the adjustment amount instruction by the operator can be easily and accurately performed. Can be achieved.

  The present invention can be realized in various modes. For example, a projection display device, a control method for the projection display device, a computer program for realizing the functions of these methods or devices, and the computer thereof The present invention can be realized in the form of a recording medium that records the program, a data signal that includes the computer program and embodied in a carrier wave, and the like.

It is explanatory drawing which shows the external appearance structure of the projector 10 as a projection type display apparatus in 1st Example of this invention. 2 is an explanatory diagram schematically showing an optical configuration of a projector. FIG. 2 is a block diagram schematically showing an internal configuration of the projector. FIG. 3 is an explanatory diagram illustrating an example of a configuration of an operation unit 600. FIG. It is a flowchart which shows the flow of the pixel shift correction process in the projector 10 of a present Example. It is explanatory drawing which shows an example of the menu screen MI. It is explanatory drawing which shows an example of pattern image PI. It is explanatory drawing which shows a pixel shift correction notionally. It is explanatory drawing which shows an example of the confirmation screen CI. It is a flowchart which shows the flow of the pixel shift correction process in 2nd Example. It is explanatory drawing which shows an example of the pattern image PI in 2nd Example. It is explanatory drawing which shows notionally pixel shift correction in 2nd Example notionally. It is explanatory drawing which shows notionally pixel shift correction in 2nd Example notionally.

Next, embodiments of the present invention will be described in the following order based on examples.
A. First embodiment:
A-1. Device configuration:
A-2. Pixel shift correction processing:
B. Second embodiment:
C. Variations:

A. First embodiment:
A-1. Device configuration:
FIG. 1 is an explanatory diagram showing an external configuration of a projector 10 as a projection display device in the first embodiment of the present invention. The projector 10 includes a housing 800, a projection optical system 340 provided on the front surface of the housing 800, and an operation unit 600 provided on the outer surface (for example, the upper surface) of the housing 800.

  FIG. 2 is an explanatory diagram schematically showing the optical configuration of the projector 10. FIG. 3 is a block diagram schematically showing the internal configuration of the projector 10. As shown in FIG. 2, the projector 10 includes an illumination optical system 100, a color light separation optical system 200, a relay optical system 220, and three primary colors of light (red (R), green (G), and blue (B)). The three liquid crystal panel units 300 (300R, 300G, and 300B), the dichroic prism 320, and the projection optical system 340 corresponding to each of the above are provided.

  The illumination optical system 100 has a light source lamp and emits white light. The color light separation optical system 200 has a plurality of dichroic mirrors, and separates the white light emitted from the illumination optical system 100 into three color lights of red, green, and blue. The color light separation optical system 200 and the relay optical system 220 guide each color light to the corresponding liquid crystal panel unit 300. The illumination optical system 100, the color light separation optical system 200, and the relay optical system 220 correspond to a color light output unit in the present invention.

  Each liquid crystal panel unit 300 has an image forming area composed of a plurality of pixels, and modulates incident color light into image light representing an image corresponding to an image signal in the image forming area. Note that the image forming area does not have to be the entire area of the pixel matrix area of the liquid crystal panel unit 300, and may be a partial area of the pixel matrix area. The liquid crystal panel unit 300 corresponds to the image forming panel unit in the present invention.

  The dichroic prism 320 combines the three image lights output from the liquid crystal panel units 300. The dichroic prism 320 corresponds to the combining unit in the present invention. The projection optical system 340 projects the image light synthesized by the dichroic prism 320. Thereby, an image is displayed on the screen SC installed in the optical axis direction of the projection optical system 340.

  As shown in FIG. 3, the projector 10 includes a main processing unit 400, a light source lamp driving unit 110, a panel driving unit 330, a projection optical system adjustment unit 350, an image acquisition unit 412, and an operation unit 600. Have.

  The light source lamp driving unit 110 drives a light source lamp included in the illumination optical system 100 (FIG. 2). The projection optical system adjustment unit 350 adjusts the arrangement of the lens group composed of a plurality of lenses of the projection optical system 340.

  The main processing unit 400 includes a CPU 401, a display image processing unit 410, a ROM 430, and a nonvolatile memory 450. The CPU 401 controls the entire projector 10.

  The image acquisition unit 412 acquires an image signal representing an image and supplies it to the display image processing unit 410. For example, the image acquisition unit 412 acquires an RGB signal from a computer, a composite signal from a video recorder, or the like, or reads and acquires an image signal stored in the memory card MC.

  The display image processing unit 410 performs predetermined processing on the image signal supplied from the image acquisition unit 412, generates an image signal for driving the liquid crystal panel unit 300, and supplies the image signal to the panel drive unit 330. The panel driving unit 330 drives each liquid crystal panel unit 300 based on the supplied image signal.

  The ROM 430 of the main processing unit 400 includes a pixel shift correction unit 440. The pixel shift correction unit 440 is a computer program for executing a pixel shift correction process described later. The CPU 401 functions as a pixel shift correction unit by reading and executing the pixel shift correction unit 440 from the ROM 430. The pixel shift correction unit 440 includes an instruction acquisition unit 442 and a pattern image signal 446. The non-volatile memory 450 of the main processing unit 400 stores adjustment data 452 that specifies an adjustment amount in pixel shift correction. Details of the pixel shift correction will be described later.

  The operation unit 600 receives an instruction operation from the operator and outputs a signal corresponding to the operation to the main processing unit 400. FIG. 4 is an explanatory diagram illustrating an example of the configuration of the operation unit 600. As shown in FIG. 4, in the present embodiment, the operation unit 600 includes a direction button group 610, an ENTER button 620, an ESC (escape) button 630, and a DEFAULT button 640. The direction button group 610 includes an upper button 612, a lower button 614, a left button 616, and a right button 618.

A-2. Pixel shift correction processing:
FIG. 5 is a flowchart showing a flow of pixel shift correction processing in the projector 10 of the present embodiment. Since the projector 10 is a three-plate projection display device having the three liquid crystal panel units 300, the projector 10 is projected due to relative displacement of the mounting positions of the three liquid crystal panel units 300 and magnification aberration of the projection optical system 340. There may be a relative shift (pixel shift) between the image lights of the respective colors constituting the image light. The pixel shift correction process is a process for correcting a relative shift (pixel shift) of the adjustment color image light with respect to the reference color image light in the projected image light by correcting the image signal supplied to the panel drive unit 330. It is.

  In the pixel shift correction process, first, an adjustment color is selected (step S110). The adjustment color is a color that is subject to pixel shift correction. In this embodiment, the reference color is set to green (G), and the adjustment color is selected from red (R) and blue (B).

  When the operator performs a predetermined operation via the operation unit 600, the pixel shift correction unit 440 controls the display image processing unit 410 and the panel drive unit 330 to project and display the menu screen MI on the screen SC. FIG. 6 is an explanatory diagram showing an example of the menu screen MI. The menu screen MI includes a selection button for enabling (ON) or disabling (OFF) correction and an adjustment color selection button. The operator selects validity / invalidity of correction and an adjustment color via the operation unit 600. The pixel shift correction unit 440 sets an adjustment color according to the signal input from the operation unit 600.

  Further, as will be described later, in this embodiment, the pattern image PI is projected during the pixel shift correction process. Menu screen MI also includes a display color selection button for pattern image PI. As the display color of the pattern image PI, it is possible to select only the adjustment color and the reference color or all colors. For example, when the adjustment color is red, it is possible to select only red and green or all red, green and blue as the display color of the pattern image PI.

  When the operator selects the adjustment color or the display color of the pattern image PI and then selects the start button of the menu screen MI, the pixel shift correction unit 440 supplies the pattern image signal 446 to the panel drive unit 330. Then, the pattern image PI is projected and displayed on the screen SC (step S120).

  FIG. 7 is an explanatory diagram showing an example of the pattern image PI. As shown in FIG. 7, the pattern image PI of the present embodiment is an image showing the positions of the four vertices of the outer periphery of the image forming area of the liquid crystal panel unit 300. That is, the pattern image PI includes a rectangular outer peripheral line having four vertices PP1, PP2, PP3, and PP4, and the four vertices of the outer peripheral line are image formation in which color light is modulated in each liquid crystal panel unit 300. It corresponds to the four vertices of the outer periphery of the region. The outer peripheral line of the pattern image PI may substantially correspond to the outer peripheral line of the image forming region of each liquid crystal panel unit 300. That is, the outer peripheral line of the pattern image PI does not have to correspond exactly to the outer peripheral line of the image forming area of each liquid crystal panel unit 300. It may correspond to the line to be.

  The pattern image PI also includes grid-like lines that divide a region surrounded by a rectangular outer peripheral line into a predetermined number of length and width. In the present embodiment, the grid-like lines of the pattern image PI are lines that equally divide the region surrounded by the outer peripheral line into 10 in the horizontal direction and the vertical direction.

  In the pattern image signal 446, the gradation value of each color at the position of each line of the pattern image PI is the highest gradation value, and the gradation value of each color in the portion other than each line of the pattern image PI is the lowest gradation value. It is an image signal. Therefore, when the display color of the pattern image PI is set to all colors, if there is no pixel shift between the three colors, each line of the pattern image PI is displayed in white and there is a pixel shift between the three colors. In this case, each line of the pattern image PI is displayed with the three color lines (or two color lines) shifted. When the display color of the pattern image PI is set to only the adjustment color and the reference color, if there is no pixel shift between the three colors, each line of the pattern image PI is displayed as a composite color of the adjustment color and the reference color. Is done. For example, when the adjustment color is red, each line is yellow, which is a composite color of red and green. If such a pattern image PI is used, the operator instructs the pixel shift correction with the goal that the color of each line in the pattern image PI is white (or a composite color of the adjustment color and the reference color). It can be carried out. The thickness of each line in the pattern image PI can be set as appropriate, but in this embodiment, the thickness corresponds to one pixel of the liquid crystal panel unit 300.

  Further, the pattern image PI of the present embodiment includes a guide screen GI that is superimposed and displayed on a grid line. The guide screen GI shows the color selected as the adjustment color and the current shift adjustment value along the horizontal and vertical directions.

  When the pattern image PI is projected and displayed, next, an adjustment point is instructed (step S130). The adjustment point is a point for instructing an adjustment amount in pixel shift correction. In this embodiment, points corresponding to the four vertices of the outer periphery of the image forming area of the liquid crystal panel unit 300 can be selected as adjustment points. The instruction for the adjustment point is acquired by the instruction acquisition unit 442.

  The instruction of the adjustment point is performed on the pattern image PI shown in FIG. When the pattern image PI is projected and displayed, a point corresponding to the upper left point PP1 of the outer peripheral line is selected as a default adjustment point. Each time the ENTER button 620 of the operation unit 600 is pressed by the operator, each of the four outer vertices of the image forming area of the liquid crystal panel unit 300 is selected in turn as an adjustment point. In the pattern image PI, a cursor CU is displayed as a display for identifying the current adjustment point.

  After the adjustment point instruction, an instruction for an adjustment amount for pixel shift correction is made (step S140). The adjustment amount is a value that specifies how much the adjustment point is moved in which direction. That is, the “adjustment amount” in the present embodiment is a concept including not only the movement amount of the adjustment point but also the movement direction of the adjustment point. The instruction for the adjustment amount is acquired by the instruction acquisition unit 442.

  The adjustment amount is instructed when the pattern image PI is projected and displayed. When any one of the buttons (up button 612, down button 614, left button 616, right button 618) constituting the direction button group 610 of the operation unit 600 is pressed, the adjustment amount of the current adjustment point is changed to the pressed button. An adjustment amount of one unit is specified for the corresponding direction. In the present embodiment, the adjustment amount of one unit is set to ¼ of the pixel interval of the liquid crystal panel unit 300.

  When there is a pixel shift of the adjustment color, the adjustment color image and the reference color image are not displayed at the position of each line of the pattern image PI, and are displayed doubly. The operator refers to the pattern image PI, and presses a button in a direction to bring the adjustment color image closer to the reference color image, and instructs the adjustment amount.

  When any one of the direction buttons 610 of the operation unit 600 is pressed and an adjustment amount instruction is acquired, the pixel shift correction unit 440 executes pixel shift correction (step S150). Specifically, the pixel shift correction unit 440 corrects the image signal corresponding to the adjustment color (pattern image signal 446) based on the instruction of the adjustment point and the adjustment amount, thereby adjusting the adjustment color for the reference color image light. The relative deviation of the image light is corrected.

  FIG. 8 is an explanatory diagram conceptually illustrating pixel shift correction. FIG. 8 shows an image forming area IA (area surrounded by points A0, B0, C0, and D0) of the liquid crystal panel unit 300 and an adjustment area AA (the position of each vertex of the image forming area IA is adjusted according to the instruction. (Areas surrounded by points A1, B1, C1, and D1).

  The pixel shift correction unit 440 divides the image forming area IA into a plurality of triangular areas whose apexes are any of the four outer vertices of the image forming area IA, and performs affine transformation that associates the triangular areas before and after the adjustment of the position of the adjustment point. calculate. For example, when an instruction to adjust the vertex B0 or the vertex C0 is acquired, an affine transformation that associates a triangular area having the vertices A0, B0, C0 with a triangular area having the vertices A1, B1, C1 as vertices; An affine transformation for associating a triangular area having vertices B0, C0, and D0 with vertices and a triangular area having vertices B1, C1, and D1 as vertices is calculated. In addition, when an instruction to adjust the vertex A0 or the vertex D0 is acquired, an affine transformation that associates a triangular area having the vertices A0, B0, and D0 with vertices and a triangular area having the vertices A1, B1, and D1 as vertices; An affine transformation for associating a triangular area having vertices A0, C0, and D0 as vertices with a triangular area having vertices A1, C1, and D1 as vertices is calculated. Such affine transformation is uniquely determined by the correspondence between the coordinate values of the four vertices A0 to D0 in the coordinate system of the image forming area IA and the coordinate values of the four vertices A1 to D1 in the coordinate system of the adjustment area AA.

  The pixel shift correction unit 440 converts the coordinate value of each pixel of the image after correction into the coordinate value of each pixel of the image before correction using the calculated conversion, and converts the pre-correction image signal in the converted coordinate value. A gradation value is calculated by interpolation, and a corrected image signal is generated. The pixel shift correction unit 440 supplies the corrected pattern image signal 446 to the panel drive unit 330. As a result, the projected and projected pattern image PI is updated to an image corresponding to the corrected pattern image signal 446, and the relative shift of the adjustment color image light with respect to the reference color image light is corrected by the instructed correction amount. Is done.

  The pixel shift correction unit 440 determines whether or not the adjustment for the selected adjustment point has been finalized after the pixel shift correction (step S160). Specifically, after the pixel shift correction, when the operator performs an adjustment amount instruction operation via the operation unit 600, the pixel shift correction unit 440 determines that the adjustment has not been confirmed, and the adjustment amount instruction Acquisition (step S140) and pixel shift correction (step S150).

  As described above, in this embodiment, the instruction of the adjustment amount for a certain adjustment point can be continuously executed. For example, when a button in a certain direction (for example, the down button 614) is pressed once, pixel shift correction is performed so that the position of the adjustment point is shifted by an adjustment amount of one unit in the direction, and the corrected pattern image PI Is displayed. When the button in the direction is pressed again, pixel shift correction is performed so that the position of the adjustment point is further shifted by one unit of adjustment amount in the direction, and the corrected pattern image PI is displayed. When a button in another direction (for example, the right button 618) is pressed once, pixel shift correction is performed so that the position of the adjustment point is shifted by one unit of adjustment amount in the other direction. A pattern image PI is displayed. In this manner, the operator instructs the adjustment amount so that the adjustment color image overlaps (or comes closest to) the reference color image while confirming the projected and displayed pattern image PI.

  After the pixel shift correction (step S150), when the operator performs an adjustment determination operation for the current adjustment point via the operation unit 600 (step S160: YES), the pixel shift correction unit 440 displays the current adjustment amount. Is stored in the nonvolatile memory 450 as the adjustment data 452 (step S170). In this embodiment, when the ENTER button 620 of the operation unit 600 is pressed after the pixel shift correction, it is determined that the confirmation of adjustment has been instructed.

  Next, the pixel shift correction unit 440 determines whether or not the pixel shift correction for the selected adjustment color has been completed (step S180). As described above, in this embodiment, every time the ENTER button 620 of the operation unit 600 is pressed, the outer four vertices of the image forming area are selected in order. Therefore, when the vertex PP1 is first selected as the adjustment point and the adjustment amount is instructed as necessary, when the ENTER button 620 of the operation unit 600 is pressed, the adjustment of the vertex PP1 is confirmed, and the next The vertex PP2 is selected as the adjustment point (step S130), and if necessary, the adjustment amount of the vertex PP2 is instructed (step S140). When adjustment is not necessary for the selected adjustment point, the operator presses the ENTER button 620 without operating the direction button group 610. As a result, the adjustment of the selected adjustment point is confirmed (assuming the adjustment amount is zero), and the next adjustment point is selected. When the ESC button 630 is pressed, the adjustment point returns to the previous point. As described above, in this embodiment, each of the four vertices of the outer periphery of the image forming area can be selected as an adjustment point, and the adjustment amount of the pixel shift at the position of each adjustment point can be individually indicated.

  After such an operation is repeated, when the ENTER button 620 of the operation unit 600 is pressed while the last vertex PP4 is selected as the adjustment point, the pixel shift correction unit 440 causes the display image processing unit 410 and the display image processing unit 410 and The panel driving unit 330 is controlled to project and display a confirmation screen CI for confirming completion of the pixel shift correction for the selected adjustment color on the screen SC. FIG. 9 is an explanatory diagram showing an example of the confirmation screen CI. In the confirmation screen CI, when the operator selects to execute the adjustment again (“No” button), the pixel shift correction unit 440 determines that the pixel shift correction for the selected adjustment color has not been completed. (Step S180: NO), the process returns to the processing after the selection of the adjustment point (Step S130). On the other hand, when the operator selects completion of adjustment (“Yes” button) on the confirmation screen CI, the pixel shift correction unit 440 determines that the pixel shift correction for the selected adjustment color has been completed ( Step S180: YES), the pixel shift correction for the selected adjustment color is terminated.

  Thereafter, the menu screen MI (FIG. 6) is displayed again, and when the start of pixel shift correction for other adjustment colors is selected (step S190: NO), pixel shift correction for the selected adjustment color (step S110). Subsequent processing) is executed. On the other hand, when completion of pixel shift correction for all colors is selected on the menu screen MI (step S190: YES), the pixel shift correction unit 440 ends the pixel shift correction processing.

  As described above, in the projector 10 according to the present embodiment, each of the four vertices of the outer periphery of the image forming area of the liquid crystal panel unit 300 can be selected as the adjustment point, and the adjustment color for the reference color image light at the position of each adjustment point. The amount of adjustment of the relative deviation of the image light can be individually indicated. The pixel shift correction unit 440 calculates a conversion that associates the image forming area with the adjustment area in which the position of each vertex of the image forming area is adjusted based on the instruction, and corrects the entire image signal using the calculated conversion. Thus, the relative shift of the image light of the adjustment color with respect to the image light of the reference color is corrected. For this reason, the projector 10 according to the present embodiment is a conventional pixel in which the operator only moves the adjustment color image horizontally or vertically in parallel with the reference color image only by instructing the adjustment amounts of the four adjustment points. Compared with shift correction, it is possible to realize pixel shift correction with higher accuracy. Therefore, the projector 10 according to the present embodiment can improve the accuracy of pixel shift correction while suppressing complication of operation.

  Further, in the projector 10 according to the present embodiment, when the instruction acquisition unit 442 acquires the adjustment amount determination instruction at the adjustment point via the operation unit 600, the pixel shift correction unit 440 stores information for specifying the adjustment amount at the adjustment point in a nonvolatile manner. Compared with the case where information for specifying the adjustment amount is stored in the non-volatile memory 450 every time there is an instruction for the adjustment amount by pressing the direction button group 610, the processing is simplified and speeded up. Can be achieved.

  In the projector 10 of the present embodiment, the pixel shift correction unit 440 supplies the pattern image signal 446 as an image signal to the panel drive unit 330 for at least the adjustment color and the reference color, and the adjustment point instruction and the adjustment amount instruction. Therefore, the correction result based on the adjustment point instruction and the adjustment amount instruction is immediately reflected in the projected pattern image PI to correct the pattern image signal 446 corresponding to the adjustment color. Instructions can be made easier and more accurate.

B. Second embodiment:
FIG. 10 is a flowchart showing the flow of pixel shift correction processing in the second embodiment. In the pixel shift correction process in the second embodiment, candidates for selecting an adjustment point (step S132) are different from those in the first embodiment shown in FIG. 5, but the other points are the same as in the first embodiment. It is. That is, in the second embodiment, in addition to the points corresponding to the four outer peripheral vertices of the image forming area of the liquid crystal panel unit 300, the outer peripheral vertices of the inner area set in the image forming area can be selected as the adjustment points. ing.

  FIG. 11 is an explanatory diagram showing an example of a pattern image PI in the second embodiment. As shown in FIG. 11, in the pattern image PI of the second embodiment, the positions of the outer periphery 4 vertices of the image forming area of the liquid crystal panel unit 300 and the outer periphery 4 vertices of the rectangular inner area set in the image forming area. It is an image to show. That is, the pattern image PI includes a rectangular second peripheral line having four vertices PP5, PP6, PP7, and PP8 in addition to a rectangular peripheral line having four vertices PP1, PP2, PP3, and PP4. The four vertices of the second outer peripheral line correspond to the four vertices of the outer peripheral line of the inner area set in the image forming area in each liquid crystal panel unit 300. As shown in FIG. 11, the outer peripheral line (second outer peripheral line) of the inner region is the same line as any of the grids that divide the region surrounded by the outer peripheral line of the image forming region of the liquid crystal panel unit 300. .

  Also in the pixel shift correction process of the second embodiment, an adjustment point is instructed after the pattern image PI is projected and displayed, as in the first embodiment (step S132). The operator can adjust the adjustment point from among the points corresponding to the four vertices of the outer periphery of the image forming area of the liquid crystal panel unit 300 and the points corresponding to the four vertices of the outer periphery of the inner area in the image forming area. The selection instruction is performed.

  Also in the pixel shift correction process of the second embodiment, as in the first embodiment, after an adjustment point instruction, an instruction for an adjustment amount for pixel shift correction is made (step S140). Pixel shift correction is performed based on the instruction (step S150).

  12 and 13 are explanatory diagrams conceptually showing pixel shift correction in the second embodiment. 12A shows an image forming area IA (area surrounded by points A0, B0, C0, and D0) of the liquid crystal panel unit 300 and an inner area SA (points E0, E0, D) set in the image forming area IA. (Area surrounded by F0, G0, H0). FIG. 12B shows each of the adjustment area AA (area surrounded by the points A1, B1, C1, and D1) in which the position of each vertex of the image forming area IA is adjusted in accordance with the instruction, and the inner area SA. An adjustment inner area ASA (area surrounded by points E1, F1, G1, and H1) in which the position of the vertex is adjusted in accordance with the instruction is shown.

  The pixel shift correction unit 440 uses the image forming area IA and the inner area SA as the apexes of the four outer peripheries of the image forming area IA (adjustment area AA) and the outer perimeter 4 vertices of the inner area SA (adjustment inner area ASA). Are divided into a plurality of triangular regions, and an affine transformation for associating the triangular regions before and after adjusting the position of the adjustment point is calculated. For example, when the adjustment instruction for the vertex A0 is acquired, as shown in FIG. 12B, before and after the adjustment for the triangular region T1 having the vertexes A0 (A1), C0 (C1), and E0 (E1) as vertices And an affine transformation that associates the area before and after adjustment with respect to the triangular area T2 having vertices A0 (A1), B0 (B1), and E0 (E1) as vertices. When the adjustment instruction for the vertex E0 is acquired, as shown in FIG. 13, the areas before and after the adjustment of the triangular area T1 having the vertexes A0 (A1), C0 (C1), and E0 (E1) as vertices are obtained. Corresponding affine transformation, affine transformation for associating regions before and after adjustment with respect to triangular region T2 having vertices A0 (A1), B0 (B1), E0 (E1) as vertices, and vertices B0 (B1), E0 (E1), F0 The affine transformation that associates the area before and after adjustment with the triangular area T3 having the vertex (F1) and the area before and after adjustment with respect to the triangular area T4 having the vertex E0 (E1), F0 (F1), and H0 (H1) as the vertex An affine transformation and an affine transformation for associating regions before and after adjustment with respect to a triangular region T5 having vertices C0 (C1), E0 (E1), and G0 (G1) Point E0 (E1), G0 (G1), and the affine transformation are calculated to associate the region before and after adjustment for the triangular region T6 whose vertices H0 (H1). Such affine transformation is uniquely determined by the correspondence between the coordinate value of each vertex in the coordinate system of the image forming area IA and the coordinate value of each vertex in the coordinate system of the adjustment area AA.

  Similar to the first embodiment, the pixel shift correction unit 440 converts the coordinate value of each pixel of the image after correction into the coordinate value of each pixel of the image before correction by using the calculated conversion, and the conversion is performed. The gradation value of the image signal before correction in the coordinate value is calculated by interpolation, and the image signal after correction is generated. The pixel shift correction unit 440 supplies the corrected pattern image signal 446 to the panel drive unit 330. As a result, the projected and projected pattern image PI is updated to an image corresponding to the corrected pattern image signal 446, and the relative shift of the adjustment color image light with respect to the reference color image light is corrected by the instructed correction amount. Is done.

  As described above, in the projector 10 of the second embodiment, each of the outer periphery 4 vertices of the image forming area of the liquid crystal panel unit 300 and the outer periphery 4 vertices of the inner area set in the image forming area can be selected as an adjustment point. At the same time, the adjustment amount of the relative shift of the adjustment color image light with respect to the reference color image light at the position of each adjustment point can be individually indicated. As in the first embodiment, when the adjustment point selection candidates are the four vertices of the outer periphery of the image forming area, the pixel shift is reduced near the outer periphery by the pixel shift correction, but the pixel shift is performed in the inner area. In some cases, the pixel shift is not reduced or the pixel shift increases. In the second embodiment, by setting the four outer peripheral vertices of the inner area in the image forming area as adjustment point selection candidates, the operator only indicates the adjustment amount of eight adjustment points at the maximum. It is possible to achieve both pixel shift reduction and pixel shift reduction in the inner region, and more accurate pixel shift correction can be realized.

C. Variations:
The present invention is not limited to the above-described examples and embodiments, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible.

C1. Modification 1:
The configuration of the projector 10 in the above embodiment is merely an example and can be variously modified. For example, in the above-described embodiment, the white light emitted from the illumination optical system 100 is separated into three color lights of red, green, and blue. Instead, the three color lights of red, green, and blue can be emitted. A light source may be used. The projector 10 is not limited to the three color lights of red, green, and blue, and emits a plurality of color lights that become white when combined, and the image light corresponding to each of the plurality of color lights is displayed on the liquid crystal panel unit. It is good also as what produces | generates by 300 and synthesize | combines and projects several image light.

  The projector 10 may include another device that modulates the input color light into image light corresponding to the image signal, instead of the liquid crystal panel unit 300.

  The configuration of the operation unit 600 of the projector 10 (FIG. 4) is merely an example, and the operation unit 600 may not have some of the buttons shown in FIG. 4 or may have other buttons. Good. In addition, the operation unit 600 may include another interface (for example, a touch panel) that receives an instruction operation by the operator. In addition to the operation unit 600 (or instead of the operation unit 600), the projector 10 may include a remote control interface that receives an operation of a remote control by the operator as an interface that receives an instruction operation of the operator.

  In the above embodiment, a part of the configuration realized by hardware may be replaced by software, and conversely, a part of the configuration realized by software may be replaced by hardware. Good. For example, in the above-described embodiment, the pixel shift correction unit 440 is realized by the CPU 401 reading out and executing a computer program. However, these functional units may be realized by hardware.

  In addition, when part or all of the functions of the present invention are realized by software, the software (computer program) can be provided in a form stored in a computer-readable recording medium. In the present invention, the “computer-readable recording medium” is not limited to a portable recording medium such as a flexible disk or a CD-ROM, but an internal storage device in a computer such as various RAMs and ROMs, a hard disk, etc. It also includes an external storage device fixed to the computer.

C2. Modification 2:
In the second embodiment, the inner area set in the image forming area of the liquid crystal panel unit 300 is a rectangle, but the inner area may be a polygonal shape other than the rectangle. In the second embodiment, a single inner area is set in the image forming area of the liquid crystal panel unit 300. In other words, the inner area has a polygonal inner area. It may be a set triple region configuration. In this case as well, more accurate pixel shift correction can be performed by selecting an adjustment point from among the outer peripheral vertex of the image forming area, the outer peripheral vertex of the inner area, and the outer peripheral vertex of the innermost area and indicating the adjustment amount. Can be realized. Furthermore, the area configuration set in the liquid crystal panel unit 300 may be a quadruple or more area configuration.

C3. Modification 3:
The configuration of the pattern image PI in the first embodiment is merely an example. The configuration of the pattern image PI can be variously modified as long as it is an image indicating the positions of the four vertices of the outer periphery of the image forming area of the liquid crystal panel unit 300. For example, the pattern image PI may be an image that displays only the vicinity of the four vertices of the outer periphery of the image forming area, or may be an image that does not include grid-like lines in the outer periphery.

  Similarly, the configuration of the pattern image PI in the second embodiment is merely an example. The configuration of the pattern image PI can be variously modified as long as it is an image showing the positions of the outer peripheral four vertices of the image forming area of the liquid crystal panel 300 and the outer peripheral four vertices of the inner area.

C4. Modification 4:
In the above embodiment, every time one of the direction buttons 610 is pressed, pixel shift correction is performed so that the position of the adjustment point is shifted by one unit of adjustment amount in the direction, and the display update of the pattern image PI is performed. However, if a confirmation operation (for example, pressing the ENTER button 620) is performed after any of the direction button groups 610 is pressed at least once, execution of pixel shift correction and display update of the pattern image PI are performed. It may be performed.

  In the above embodiment, each time the ENTER button 620 is pressed, the adjustment point is selected in order. However, the adjustment point selection instruction is performed by moving the cursor CU with the direction button group 610 and moving the cursor CU to a desired point. May be displayed by pressing the ENTER button 620.

C5. Modification 5:
In the above-described embodiment, the pixel shift correction unit 440 performs pixel shift correction using affine transformation that associates triangular regions before and after adjustment of the position of the adjustment point. However, the method of pixel shift correction is not limited to this. For example, the pixel shift correction unit 440 may perform the pixel shift correction by using a projective transformation that associates the image forming area IA with the adjustment area AA or a projective transformation that associates the inner area SA with the adjustment inner area ASA. Such projective transformation is uniquely determined by the correspondence between the coordinate value of each vertex in the coordinate system of the image forming area IA and the coordinate value of each vertex in the coordinate system of the adjustment area AA. Further, the pixel shift correction unit 440 may perform pixel shift correction by another method using a known interpolation method.

DESCRIPTION OF SYMBOLS 10 ... Projector 100 ... Illumination optical system 110 ... Light source lamp drive part 200 ... Color light separation optical system 220 ... Relay optical system 300 ... Liquid crystal panel part 320 ... Dichroic prism 330 ... Panel drive part 340 ... Projection optical system 350 ... Projection optical system adjustment Unit 400 ... Main processing unit 401 ... CPU
410 ... Display image processing unit 412 ... Image acquisition unit 430 ... ROM
440: Pixel shift correction unit 442 ... Instruction acquisition unit 446 ... Pattern image signal 450 ... Non-volatile memory 452 ... Adjustment data 600 ... Operation unit 610 ... Direction button group 612 ... Up button 614 ... Down button 616 ... Left button 618 ... Right button 620 ... ENTER button 630 ... ESC button 640 ... DEFAULT button 800 ... casing

Claims (5)

A projection display device that displays an image on a projection surface,
An image acquisition unit for acquiring an image signal;
A color light output unit for outputting multiple colors of color light;
A plurality of image forming panel portions each having an image forming area that is provided corresponding to each of the plurality of colors of light and includes a plurality of pixels;
A panel driving section that drives each of the image forming panel sections so that the color light is modulated into image light corresponding to the image signal in the image forming area;
A combining unit that combines the image light output from each of the image forming panel units;
A projection optical system for projecting the combined image light;
At least one point among the four vertices forming a rectangle in the image forming area of each image forming panel and the outer peripheral vertex of the polygonal inner area set in the image forming area is selected as an adjustment point. Adjustment point instruction, and an adjustment amount for individually indicating the adjustment amount of relative deviation between the image light of the adjustment color selected from the plurality of colors and the image light of the reference color different from the adjustment color for each of the adjustment points An instruction acquisition unit for acquiring instructions;
A deviation correction unit that corrects a relative deviation of the image light of the adjustment color with respect to the image light of the reference color by correcting the image signal corresponding to the adjustment color based on the adjustment point instruction and the adjustment amount instruction; A projection display device comprising: The projection display device according to claim 1, further comprising:
A non-volatile storage unit,
The instruction acquisition unit acquires a confirmation instruction for the adjustment amount at the adjustment point,
The deviation correction unit is a projection display device that stores information specifying the adjustment amount at the adjustment point in the nonvolatile storage unit when the confirmation instruction is acquired. The projection display device according to claim 1 or 2, wherein
The misalignment correction unit is configured such that a polygonal region having one of the four vertices of the rectangle in the image forming region and an outer peripheral vertex of the inner region as a vertex, and the adjustment point of the image forming region according to the adjustment amount instruction A projection display device that corrects the image signal using a conversion that associates an area corresponding to the polygonal area in an adjustment area that has been moved by an instructed adjustment amount. The projection display device according to any one of claims 1 to 3, further comprising:
An image storage unit for storing a pattern image signal representing a pattern image indicating the positions of the four vertices of the rectangle of the image forming area and the positions of the outer peripheral vertices of the inner area;
The deviation correction unit supplies the pattern image signal as the image signal to the panel driving unit for at least the adjustment color and the reference color, and the adjustment color based on the adjustment point instruction and the adjustment amount instruction. A projection display device that corrects the pattern image signal corresponding to the above. An image acquisition unit that acquires an image signal, a color light output unit that outputs color light of a plurality of colors, and a plurality of image formation regions that are provided corresponding to each of the color lights of the plurality of colors and that include an image formation region that includes a plurality of pixels From the image forming panel unit, a panel driving unit that drives each image forming panel unit so that the color light is modulated into image light corresponding to the image signal in the image forming region, and from each image forming panel unit A control method for a projection display device, comprising: a combining unit that combines the output image light; and a projection optical system that projects the combined image light,
At least one point among the four vertices forming a rectangle in the image forming area of each image forming panel and the outer peripheral vertex of the polygonal inner area set in the image forming area is selected as an adjustment point. Adjustment point instruction, and an adjustment amount for individually indicating the adjustment amount of relative deviation between the image light of the adjustment color selected from the plurality of colors and the image light of the reference color different from the adjustment color for each of the adjustment points Obtaining the instructions; and
Correcting the image signal corresponding to the adjustment color based on the adjustment point instruction and the adjustment amount instruction, and correcting a relative deviation of the image light of the adjustment color with respect to the image light of the reference color. ,Method.

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