JP5967242B2 - Projector and control method thereof - Google Patents

Description

  The present invention relates to a projector that projects an image and a control method thereof.

  In a projector that projects an image formed by a light modulation device such as a liquid crystal panel onto a projection surface such as a screen, when the image is projected with the projector tilted with respect to the projection surface, the image displayed on the projection surface ( A phenomenon in which the projected image) is distorted in a trapezoidal shape (trapezoidal distortion) occurs. In this case, when forming an image with the light modulation device, it is possible to correct the trapezoidal distortion by forming it in a shape that cancels the trapezoidal distortion and display the image in a regular shape (rectangular shape). It becomes possible.

  Patent Document 1 proposes a projector that can automatically correct trapezoidal distortion. The projector includes an imaging unit that captures an image of the projection surface. The projector detects a projected image or a screen frame from images captured by the imaging unit, and based on these shapes, an image to be formed by the light modulation device. The shape is determined. If such a projector is used, it becomes possible to easily correct the trapezoidal distortion.

JP 2006-5534 A

  However, when an image is projected onto a projection plane without a screen frame or a projection plane with an unclear screen frame, accurate correction becomes difficult. Therefore, it is necessary to provide means for manually correcting trapezoidal distortion. is there. In addition, it is desirable that a trapezoidal distortion can be manually corrected even in the case of an inexpensive projector that does not include an imaging unit. However, manual correction is more complicated for the user than the automatic correction, and it is easy to get lost in operation. Therefore, it is desired that correction can be easily performed with an easy-to-understand operation even if it is manual.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A projector according to this application example projects a light source, a light modulation device that modulates light emitted from the light source to form an image, and a projection that projects the image formed by the light modulation device. An optical image, an identification image display unit that projects and displays four identification images respectively corresponding to four corners of the image from the projection optical system, and the four identification images displayed by the identification image display unit A selection operation unit that accepts an operation for selecting one of the above, a highlight display unit that displays the identification image selected by the selection operation unit larger than the other three identification images, and the highlight display In the state where the identification image is displayed, the movement operation unit that receives an operation for moving the corner portion, and the operation selected by the selection operation unit based on the operation received by the movement operation unit Against identification image An image correcting unit that moves the corner portions, characterized by comprising a.

  According to this projector, since the identification image selected by the selection operation unit is displayed larger than the identification image not selected, it is possible to easily recognize which corner is the target of the moving operation. It becomes possible. As a result, it is possible to easily correct the image by moving the corner.

  Application Example 2 In the projector according to the application example, it is preferable that the highlighting unit enlarges and displays the identification image selected by the selection operation unit.

  According to this projector, since the identification image selected by the selection operation unit is enlarged and displayed, it becomes possible to more easily recognize the corner portion to be moved.

  Application Example 3 In the projector according to the application example, it is preferable that the highlighting unit does not display the three identification images that are not selected by the selection operation unit.

  According to this projector, since the identification image that has not been selected by the selection operation unit is not displayed, it is possible to more easily recognize the corner that is the target of movement.

  Application Example 4 In the projector according to the application example, the highlighting unit adds a direction mark corresponding to a direction that can be moved by the movement operation unit to the identification image selected by the selection operation unit. Is desirable.

  According to this projector, since the highlighting unit adds a direction mark corresponding to the movable direction to the identification image selected by the selection operation unit, it is easily recognized that the corner portion is movable. It becomes possible to do.

  Application Example 5 In the projector according to the application example described above, in the state where the corner portion is located at the limit of the movable range and cannot move in a predetermined direction, the direction mark corresponding to the direction is provided. It is desirable to make it inconspicuous.

  According to this projector, since the direction mark in the direction in which the corner cannot move is not conspicuous, it is possible to easily recognize the actually movable direction.

  Application Example 6 In the projector according to the application example described above, when the movement operation unit receives a predetermined operation, the identification image display unit returns to a state of displaying the four identification images, and the 4 It is desirable that the selection operation unit accepts an operation for selecting one of the two identification images.

  According to this projector, if a predetermined operation is performed after the corner corresponding to the selected identification image is moved, the identification image (corner) is selected again. Therefore, the plurality of corners are moved. Convenience is improved.

  Application Example 7 A projector control method according to this application example includes a light modulation device that modulates light emitted from a light source to form an image, and projection optics that projects the image formed by the light modulation device. A method for controlling a projector including a system, comprising: an identification image display step of projecting and displaying four identification images respectively corresponding to corners of the four corners of the image from the projection optical system; and the identification image display step The selection operation step for accepting an operation for selecting one of the four identification images displayed in step (a) and the identification image selected in the selection operation step are displayed larger than the other three identification images. An emphasis display step, a move operation step for accepting an operation for moving the corner in a state where the identification image is displayed in the emphasis display step, Based on the operation received by the moving operation step, characterized in that and an image correcting step of moving the corner corresponding to the selected the identification image at the selected operation step.

  According to this projector control method, since the identification image selected in the selection operation step is displayed larger than the identification image not selected, it is easy to recognize which corner is the target of the movement operation. It becomes possible to do. As a result, it is possible to easily correct the image by moving the corner.

  When the projector and the control method described above are constructed using a computer provided in the projector, the form and the application example described above are a program for realizing the function, or the program is stored in the computer. It is also possible to constitute in the form of a recording medium or the like recorded so as to be readable by the user. Recording media include flexible discs, CD-ROMs, magneto-optical discs, IC cards, ROM cartridges, punch cards, printed matter printed with codes such as bar codes, projector internal storage devices (memory such as RAM and ROM), Various media that can be read by the computer, such as an external storage device, can be used.

1 is a block diagram showing a schematic configuration of a projector. It is explanatory drawing for demonstrating trapezoid distortion, (a) is the side view which looked at the projector and the projection surface from the side, (b) is the front view which shows a projection surface. It is explanatory drawing for demonstrating trapezoid distortion, (a) is the side view which looked at the projector and the projection surface from the side, (b), (d) is a front view which shows a projection surface, (c) is The figure which shows the pixel area | region of a liquid crystal light valve. 7 is a flowchart for explaining the operation of the projector when a keystone distortion correction key is operated. The figure which shows a corner selection image. The figure which shows a corner adjustment image. (A)-(i) is explanatory drawing for demonstrating the movement of the corner | angular part of an image formation area, and is a figure which shows the pixel area | region of a liquid crystal light valve. (A)-(f) is explanatory drawing for demonstrating the correction | amendment procedure of trapezoid distortion, and is a front view which shows a projection surface. (A), (b) is explanatory drawing for demonstrating the correction | amendment procedure of trapezoid distortion, and is a figure which shows the pixel area | region of a liquid crystal light valve. The figure which shows the corner adjustment image which concerns on a modification. The figure which shows the corner adjustment image which concerns on a modification. The figure which shows the corner adjustment image which concerns on a modification. The figure which shows the corner adjustment image which concerns on a modification. The figure which shows the corner selection image which concerns on a modification.

Hereinafter, the projector of this embodiment will be described with reference to the drawings.
The projector modulates the light emitted from the light source to form an image based on image information input from the outside (hereinafter referred to as “input image”), and this image is applied to a surface (hereinafter referred to as a screen or a wall surface). It is an optical device that projects onto a projection surface.

FIG. 1 is a block diagram showing a schematic configuration of the projector.
As shown in FIG. 1, the projector 1 includes an image projection unit 10, a control unit 20, a storage unit 21, an input operation unit 22, an image information input unit 23, an image processing unit 24, an OSD processing unit 25, an image correction unit 26, and the like. It has.

  The image projection unit 10 includes a light source 11, three liquid crystal light valves 12 (12R, 12G, 12B) as a light modulation device, a projection lens 13 as a projection optical system, a light valve drive unit 14, and the like. The image projection unit 10 corresponds to a display unit, modulates the light emitted from the light source 11 with the liquid crystal light valve 12 to form an image (image light), and enlarges and projects this image from the projection lens 13. Display on the projection surface S.

  The light source 11 includes a discharge-type light source lamp 11a made of an ultra-high pressure mercury lamp, a metal halide lamp, or the like, and a reflector 11b that reflects light emitted from the light source lamp 11a in a substantially constant direction. Light emitted from the light source 11 is converted into light having a substantially uniform luminance distribution by an integrator optical system (not shown), and red (R), green (G), and blue, which are the three primary colors of light, by a color separation optical system (not shown). After being separated into the color light components of (B), they are incident on the liquid crystal light valves 12R, 12G, and 12B, respectively.

  The liquid crystal light valve 12 is configured by a liquid crystal panel in which liquid crystal is sealed between a pair of transparent substrates. The liquid crystal light valve 12 is formed with a rectangular pixel region 12a composed of a plurality of pixels 12p arranged in a matrix, and a driving voltage can be applied to the liquid crystal for each pixel 12p. When the light valve driving unit 14 applies a driving voltage corresponding to the input image information to each pixel 12p, each pixel 12p is set to a light transmittance corresponding to the image information. For this reason, the light emitted from the light source 11 is modulated by transmitting through the pixel region 12a of the liquid crystal light valve 12, and an image corresponding to the image information is formed for each color light.

  The formed images of the respective colors are synthesized for each pixel 12p by a color synthesizing optical system (not shown) to form a color image, and then enlarged and projected onto the projection plane S by the projection lens 13. The projection lens 13 is provided with a zoom mechanism (not shown) for changing the enlargement ratio of the image, and the user can adjust the display size of the image by the zoom mechanism.

  In the present specification, the entire image projected from the projection lens 13 is referred to as a “projected image”. The projected image is a projection of an image formed in the entire area of the pixel area 12a. Even when the entire area or a part of the area of the pixel area 12a is black (a state in which almost no light is transmitted), A range including a part corresponding to the region is a projection image. Further, for example, when an image is projected onto the screen, even if a part of the image protrudes from the screen and is projected onto the rear wall surface or the like, a range including the protruding portion is a projected image.

  The control unit 20 includes a CPU (Central Processing Unit), a RAM (Random Access Memory) used for temporary storage of various data (not shown), and the like, according to a control program stored in the storage unit 21. By operating, the overall operation of the projector 1 is controlled. That is, the control unit 20 functions as a computer together with the storage unit 21.

  The storage unit 21 includes a non-volatile memory such as a mask ROM (Read Only Memory), a flash memory, or an FeRAM (Ferroelectric RAM). The storage unit 21 stores a control program for controlling the operation of the projector 1, various setting data for defining operation conditions of the projector 1, and the like.

  The input operation unit 22 receives an input operation from the user, and includes a plurality of operation keys for the user to give various instructions to the projector 1. The operation keys provided in the input operation unit 22 include a power key for switching on / off the power, a menu key for displaying a menu image for performing various settings, and a determination for confirming an item selected by the menu image. There are a key, four direction keys corresponding to up, down, left, and right, a cancel key for instructing to cancel an operation, a trapezoid distortion correction key for correcting trapezoid distortion, and the like. When the user operates various operation keys of the input operation unit 22, the input operation unit 22 outputs an operation signal corresponding to the operation content of the user to the control unit 20. The input operation unit 22 may be configured using a remote control (not shown) capable of remote operation. In this case, the remote control transmits an infrared operation signal corresponding to the user's operation content, and a remote control signal receiving unit (not shown) receives this and transmits it to the control unit 20.

  The image information input unit 23 includes a connection terminal (not shown) for connection to an external image output device (not shown), and various types of image information (image signals) are input from the image output device. The The image information input unit 23 outputs the input image information to the image processing unit 24.

  The image processing unit 24 converts the various types of image information input from the image information input unit 23 into image information representing the gradation of each pixel 12p of the liquid crystal light valves 12R, 12G, and 12B. Here, the converted image information is classified by R, G, and B color lights, and is constituted by a plurality of pixel values corresponding to all the pixels 12p of the liquid crystal light valves 12R, 12G, and 12B. The pixel value defines the light transmittance of the corresponding pixel 12p, and the intensity (gradation) of light emitted from each pixel 12p is defined by this pixel value. In addition, the image processing unit 24 performs image quality adjustment processing for adjusting brightness, contrast, sharpness, hue, and the like on the converted image information based on an instruction from the control unit 20, and the processed image information Is output to the OSD processing unit 25.

  The OSD processing unit 25 performs processing for superimposing an OSD (on-screen display) image such as a menu image or a message image on the input image based on an instruction from the control unit 20. The OSD processing unit 25 includes an OSD memory (not shown), and stores image data representing graphics, fonts, and the like for forming an OSD image. When the control unit 20 instructs to superimpose an OSD image, the OSD processing unit 25 reads necessary image data from the OSD memory, and generates OSD image information for forming a specified OSD image. Then, the OSD image information is combined with the image information input from the image processing unit 24 so that the OSD image is superimposed at a predetermined position on the input image. The image information combined with the OSD image information is output to the image correction unit 26. When there is no instruction to superimpose the OSD image from the control unit 20, the OSD processing unit 25 outputs the image information input from the image processing unit 24 to the image correction unit 26 as it is.

  The image correction unit 26 corrects the image (image information) based on an instruction from the control unit 20. Specifically, the image correction unit 26 sets the image forming area 12e having a shape set by the user in the pixel area 12a of the liquid crystal light valve 12 (see FIG. 3C). Then, the image information input from the OSD processing unit 25 is corrected so that the input image Pi is formed in the image forming area 12e. Further, the image correcting unit 26 sets the black pixel value, that is, the pixel value that minimizes the light transmittance, for the pixel 12p outside the image forming area 12e so as to invalidate the area outside the image forming area 12e. Set. The image correction unit 26 outputs the image information corrected as described above to the light valve driving unit 14. When there is no instruction to correct the image from the control unit 20, the image correction unit 26 outputs the image information input from the OSD processing unit 25 to the light valve driving unit 14 as it is. In this case, the input image Pi is formed over the entire pixel area 12a. In other words, the entire pixel area 12a becomes the image forming area 12e.

  When the light valve driving unit 14 drives the liquid crystal light valve 12 according to the input image information, the liquid crystal light valve 12 forms an image according to the image information, and projects it from the projection lens 13 onto the projection surface S as a projection image. Is done.

Next, an outline of the trapezoidal distortion correction of the projector 1 will be described.
2 and 3 are explanatory diagrams for explaining trapezoidal distortion. FIGS. 2A and 3A are side views of the projector 1 and the projection surface S viewed from the side, and FIG. FIGS. 3B, 3B, and 3D are front views showing the projection surface S, and FIG. 3C is a view showing the pixel region 12a of the liquid crystal light valve 12. FIG.

  As shown in FIG. 2A, in a state where the projector 1 is not inclined with respect to the projection surface S, that is, in a state where the optical axis direction of the projection lens 13 is substantially the same as the normal direction of the projection surface S. As shown in FIG. 2B, trapezoidal distortion does not occur in the projected image Ao, and the projected image Ao is displayed in its original shape (rectangular shape). In this case, it is only necessary to form the input image Pi over the entire pixel area 12a. Therefore, it is not necessary to perform correction by the image correcting unit 26, and the projection image Ao (input image Pi) is displayed over the entire projection surface S. Thus, the zoom adjustment, the adjustment of the installation position of the projector 1 and the like may be appropriately performed.

  On the other hand, as shown in FIG. 3A, in a state where the projector 1 is inclined with respect to the projection plane S, that is, in a state where the optical axis direction of the projection lens 13 is different from the normal direction of the projection plane S. As shown in FIG. 3B, trapezoidal distortion occurs in the projected image Ao. For this reason, when the input image Pi is formed over the entire pixel region 12a, the input image Pi is displayed distorted due to trapezoidal distortion. Here, as shown in FIG. 3C, an image forming area 12e having a shape capable of canceling the trapezoidal distortion, that is, a shape distorted in the opposite direction to the projected image Ao, is set in the pixel area 12a. If the input image Pi is formed in the image forming area 12e, the distorted shape of the image forming area 12e (input image Pi) is canceled out by the trapezoidal distortion, and the projection surface S has an original shape in which the trapezoidal distortion is corrected. The input image Pi is displayed in a (rectangular shape) (see FIG. 3D).

  As described above, the input operation unit 22 includes the trapezoidal distortion correction key, and the user can set the shape of the image forming area 12e by operating the trapezoidal distortion correction key.

  FIG. 4 is a flowchart for explaining the operation of the projector 1 when the keystone distortion correction key is operated. When the user operates the trapezoidal distortion correction key while the projector 1 is projecting the input image Pi, the control unit 20 operates according to the flow shown in FIG.

  As shown in FIG. 4, in step S101, the control unit 20 instructs the OSD processing unit 25 to superimpose and display the corner selection image Ps (see FIG. 5) on the input image Pi.

  As shown in FIG. 5, the corner selection image Ps includes a title portion Ta, four identification images C corresponding to the four corners of the input image Pi, that is, the four corners of the image forming area 12e, and a message to the user. The message part Ma, the operation key which can be operated, and the key guide part Ka which guides the operation | movement are included.

  The four identification images C are an identification image C1 corresponding to the upper left corner of the image forming area 12e (input image Pi), an identification image C2 corresponding to the upper right corner, and an identification image corresponding to the lower left corner. C3 and an identification image C4 corresponding to the lower right corner, all of which have the same size. The identification images C1 to C4 are arranged in a matrix of 2 rows and 2 columns, and are arranged at corresponding positions (for example, the identification image C1 corresponding to the upper left corner is arranged at the upper left. ) In addition, illustrations representing the corresponding corners are drawn on the identification images C1 to C4.

  The title portion Ta is described as “corner position adjustment”, and it is understood that this function is a function of correcting the trapezoidal distortion by adjusting the position of the corner portion. In addition, the message portion Ma has a description “Please select an area.”, And prompts the user to select any one corner by the identification images C1 to C4. One of the identification images C1 to C4 (identification image C1 in the example of FIG. 5) has a color scheme different from the other three, indicating that the identification image C is in a selected state. . Hereinafter, the color scheme of the selected identification image C is also referred to as “selected color scheme”, and the color scheme of the unselected identification image C is also referred to as “non-selected color scheme”. The user can select a desired identification image C by operating the direction key. When the user presses the enter key after selecting the identification image C, the selection of the identification image C is confirmed.

  Returning to FIG. 4, in step S <b> 102, the control unit 20 determines whether or not the direction key is operated by the user. If the direction key is not operated, the process proceeds to step S104. If the direction key is operated, the process proceeds to step S103.

  When the direction key is operated and the process proceeds to step S103, the control unit 20 newly selects another identification image C arranged in the direction of the operated direction key and returns to step S101. As a result, the newly selected identification image C is displayed in the selected color scheme in the corner selection image Ps, and the identification image C that has been selected so far is displayed in the non-selected color scheme.

  When the direction key is not operated and the process proceeds to step S104, the control unit 20 determines whether or not the determination key is operated by the user. If the enter key is not operated, the process proceeds to step S105. If the enter key is operated, the process proceeds to step S107.

  When the determination key is not operated and the process proceeds to step S105, the control unit 20 determines whether or not the cancel key is operated by the user. If the cancel key has not been operated, the process returns to step S102. If the cancel key has been operated, the process proceeds to step S106.

  When the cancel key is operated and the process proceeds to step S106, the control unit 20 instructs the OSD processing unit 25 to end the superimposed display of the corner selection image Ps, and ends the flow.

  When the determination key is operated in step S104 and the process proceeds to step S107, the control unit 20 instructs the OSD processing unit 25 to replace the corner selection image Ps with the corner adjustment image Pz (see FIG. 6). ).

  As shown in FIG. 6, the corner adjustment image Pz includes a title part Tb, an enlarged image display part Z, a message part Mb in which a message to the user is written, an operable operation key, and keys for guiding the operation thereof. The title portion Tb is described as “corner position adjustment” in the title portion Tb, like the title portion Ta of the corner selection image Ps.

  In the enlarged image display unit Z, one identification image C (identification image C1 in the example of FIG. 6) selected from the corner selection image Ps among the above-described four identification images C1 to C4 is enlarged and displayed. The three identification images C that were not selected are not displayed. In addition, a triangular direction mark D indicating the up / down / left / right direction is added to the enlarged image display unit Z, and the corner corresponding to the enlarged identification image C can be moved (position adjustment) up / down / left / right. It is shown that. Further, a message “Please make adjustments” is written in the message part Mb, prompting the user to adjust the position of the corners. In a state in which the corner adjustment image Pz is displayed, the user can adjust the position of the corner by operating the direction key.

  Returning to FIG. 4, in step S108, the control unit 20 determines whether or not the direction key is operated. When the direction key is operated, the process proceeds to step S109, and when the direction key is not operated, the process proceeds to step S110.

  When the direction key is operated and the process proceeds to step S109, the control unit 20 instructs the image correction unit 26 to move the selected corner in the direction of the operated direction key, Return to S107. For example, when the identification image C1 is selected from the corner selection image Ps, that is, when the upper left corner is selected, the image correction unit 26, as shown in FIG. 7, the upper left corner of the image forming area 12e. The unit is moved by a predetermined amount in the direction of the operated direction key. Thereafter, the image correcting unit 26 corrects the image information so that the input image Pi is formed in the image forming region 12e having a new shape after the corner portion is moved. If the user repeatedly operates or presses the direction key, steps S108 and S109 are repeatedly executed, and the selected corner can be moved by a necessary amount.

  Note that the relationship between the top, bottom, left and right of the projected input image Pi and the top, bottom, left and right of the liquid crystal light valve 12 does not necessarily match. In this case, however, the corner of the projected input image Pi is in the operated direction. The corners of the image forming area 12e are moved so as to move.

  Further, since the corner of the image forming area 12e cannot move to the outside of the pixel area 12a, the corner is located on the outer edge (boundary) of the pixel area 12a, that is, at the limit of the movable range. The control unit 20 ignores the operation of the direction key in the direction toward the outside of the pixel region 12a. Further, when the corner portion is located on the outer edge of the pixel region 12a, the control unit 20 instructs the OSD processing unit 25 to notify the user that it cannot move in the outer direction. Thus, the color of the direction mark D in the direction toward the outside of the pixel region 12a, that is, the direction incapable of moving, is less conspicuous than the color of the direction mark D in another direction (for example, a bright color such as orange) (for example, , Dark color such as gray). For example, as shown in FIGS. 7A, 7 </ b> B, and 7 </ b> C, when the corner to be moved is located at the upper end of the pixel region 12 a, the upward direction mark D is inconspicuous. When the up direction key is operated, the operation is ignored. Further, as shown in FIGS. 7A, 7D, and 7G, when the corner to be moved is located at the left end of the pixel region 12a, the left direction mark D is inconspicuous. When the left direction key is operated, the operation is ignored. The reason why the corner adjustment image Pz is displayed again after returning to step S107 after step S109 is to update the color of the direction mark D according to the situation. The limit of the movable range may be set not only on the outer edge of the pixel region 12a but also in the direction inside the pixel region 12a.

  Returning to FIG. 4, when the direction key is not operated in step S108 and the process proceeds to step S110, the control unit 20 determines whether or not the enter key or the cancel key is operated. If neither the enter key nor the cancel key is operated, the process returns to step S108. On the other hand, if either the enter key or the cancel key is operated, the movement of the selected corner is completed and the process returns to step S101 to return to the state where the corner selection image Ps is displayed. Thereafter, the user can select another corner and continue the adjustment, or can operate the cancel key to end the process.

Next, a specific procedure for correcting the trapezoidal distortion shown in FIG. 3 according to the above-described flow will be described.
8 and 9 are explanatory diagrams for explaining the trapezoidal distortion correction procedure. FIGS. 8A to 8F are front views showing the projection surface S, and FIGS. 9A and 9B. FIG. 4 is a diagram showing a pixel region 12 a of the liquid crystal light valve 12.

  If the user operates the trapezoidal distortion correction key in a state where the trapezoidal distortion as shown in FIG. 3B is generated in the input image Pi projected on the projection surface S, the control unit 20 will be shown in FIG. The operation according to the flow is started, and first, as shown in FIG. 8A, the corner selection image Ps is superimposed on the input image Pi (step S101).

  The user operates the direction key as necessary (step S102), and first selects the identification image C1 corresponding to the upper left corner (step S103). When the user operates the enter key (step S104), the control unit 20 displays the corner adjustment image Pz superimposed on the input image Pi as shown in FIG. 8B (step S107), and the enlarged image. The identification image C1 is enlarged and displayed on the display unit Z.

  When the corner adjustment image Pz is displayed, the user can move the corner of the image forming area 12e (input image Pi) by operating the direction key, and the user can move the selected upper left corner to the right. In order to move in the downward direction, the right direction key and the downward direction key are appropriately operated (step S108). As shown in FIG. 7, the upper left corner of the image forming area 12e moves by a predetermined amount each time the right key is operated, and is moved downward each time the lower key is operated. It moves by fixed amount (step S109). Then, the user moves the upper left corner of the image forming area 12e to the lower right by a necessary amount while viewing the input image Pi projected on the projection surface S (see FIG. 8C) (FIG. 9 ( a)). Thereafter, when the user operates the enter key or the cancel key (step S110), the movement of the upper left corner is completed, and the state returns to the state where the corner selection image Ps is displayed as shown in FIG. S101).

  Next, the user operates the direction key as necessary (step S102), and this time selects the identification image C2 corresponding to the upper right corner (step S103). When the user operates the enter key (step S104), the control unit 20 causes the corner adjustment image Pz to be superimposed on the input image Pi as shown in FIG. 8E (step S107), and the enlarged image thereof. The identification image C2 is enlarged and displayed on the display unit Z.

  When the corner adjustment image Pz is displayed, the user appropriately operates the left and down keys while looking at the input image Pi projected on the projection plane S (see FIG. 8F) (step S108). ) The upper right corner of the image forming area 12e is moved to the lower left by a necessary amount (see FIG. 9B). When the user operates the enter key or the cancel key (step S110), the movement of the upper right corner is completed and the state returns to the state where the corner selection image Ps is displayed (step S101). Thereafter, when the user operates the cancel key (step S105), the superimposed display of the corner selection image Ps ends (step S106), and the input image Pi is displayed in a state in which the trapezoidal distortion is eliminated (FIG. 3D). reference).

  As described above, according to the projector 1 of the present embodiment, the following effects can be obtained.

(1) According to the projector 1 of the present embodiment, since the identification image C selected in the corner selection image Ps is enlarged and displayed in the corner adjustment image Pz, the corner is moved (position adjustment). At this time, it is possible to easily recognize which corner portion is the object of movement. As a result, it is possible to easily perform image correction (keystone distortion correction) by moving the corners.
Here, similarly to the corner selection image Ps, also in the corner adjustment image Pz, the four identification images C1 to C4 are displayed with the same size, and the selected identification image C and the other identification images C are displayed only by the color scheme. Assuming that it is determined, it becomes difficult to distinguish between the corner selection image Ps and the corner adjustment image Pz, which may confuse the user. However, according to the projector 1 of the present embodiment, the distinction between the two is clear and the user is not confused.

  (2) According to the projector 1 of the present embodiment, since the direction mark D corresponding to the direction in which the corner can move (up / down / left / right direction) is added to the corner adjustment image Pz, the corner adjustment image Pz is displayed. In this state, it can be easily recognized that the corner portion is movable. Further, since the direction mark D in the direction in which the corner cannot move is made inconspicuous, it is possible to easily recognize the actually movable direction.

  In the present embodiment, the control unit 20 and the OSD processing unit 25 when executing step S101 (see FIG. 4) to display the corner selection image Ps including the identification images C1 to C4 are the identification image display unit. It corresponds to. Further, the control unit 20 and the OSD processing unit 25 when the corner adjustment image Pz is displayed in step S107 and the selected identification image C is enlarged correspond to the highlighting unit. The direction keys provided in the input operation unit 22 are an operation (selection operation) for selecting the identification image C in the corner selection image Ps and an operation (movement) for moving the corner while the corner adjustment image Pz is displayed. Since it is used for both operations, it corresponds to both the selection operation unit and the movement operation unit. Steps S101, S102, S107, S108, and S109 correspond to an identification image display step, a selection operation step, a highlight display step, a movement operation step, and an image correction step, respectively.

(Modification)
Moreover, you may change the said embodiment as follows.

  In the above embodiment, only the identification image C selected in the corner selection image Ps is displayed in the corner adjustment image Pz. That is, other identification images C that have not been selected are not displayed in the corner adjustment image Pz, but as shown in FIGS. 10 and 11, from the selected identification image C (identification image C1 in the example in the figure). If the size is small, a part or all of the identification images C that are not selected (identification images C2 to C4 in the illustrated example) may be included in the corner adjustment image Pz. Further, as shown in FIGS. 12 and 13, the selected identification image C does not necessarily need to be enlarged, and the identification image C that has not been selected may simply be reduced or hidden. As described above, the corner adjustment image Pz may be an aspect that displays the identification image C selected by the corner selection image Ps larger than the identification image C that is not selected. As described above, a mode in which only the selected identification image C is displayed and the other identification images C are not displayed is also included.

  In the above embodiment, in the corner adjustment image Pz, the color of the direction mark D in the direction that cannot be moved is made inconspicuous, and this operation is ignored when the direction key in that direction is operated. However, when a direction key in a direction in which movement is not possible is operated, a message notifying that movement is not possible may be displayed on the message part Mb or the like.

  In the above embodiment, if it is possible to identify whether or not the position adjustment of each corner has been completed on the corner selection image Ps, it becomes easier to grasp the implementation status of the position adjustment and the convenience is improved. For example, as shown in FIG. 14, an adjusted mark F indicating that the position adjustment has been completed when the movement of the corner (position adjustment) is completed in steps S107 to S110 (see FIG. 4) and the process returns to step S101. May be added to the identification image C (the identification image C1 in the example of FIG. 14). Alternatively, the color scheme of the identification image C whose position has been adjusted may be changed.

  In the above embodiment, when a direction key is operated while the corner adjustment image Pz is displayed, the color of the corresponding direction mark D may be temporarily changed in conjunction with the operation. . According to this, since the color of the direction mark D changes every time the direction key is operated, the user can recognize that the operation of the direction key is normally received.

  In the above embodiment, the three-plate projector 1 using the three liquid crystal light valves 12R, 12G, and 12B as the light modulation device has been described. However, the aspect of the light modulation device is not limited to this. For example, it is possible to adopt an aspect in which an image is formed by one liquid crystal light valve including sub-pixels that can transmit R light, G light, and B light in each pixel 12p.

  In the above-described embodiment, the transmissive liquid crystal light valve 12 is used as the light modulator, but a reflective light modulator such as a reflective liquid crystal light valve may be used. Further, by controlling the emission direction of the incident light for each micromirror as the pixel 12p, a micromirror array device that modulates the light emitted from the light source 11 can be used.

  In the above embodiment, the light source 11 is configured by the discharge-type light source lamp 11a, but a solid light source such as an LED light source or other light sources can also be used.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 10 ... Image projection part, 11 ... Light source, 11a ... Light source lamp, 11b ... Reflector, 12, 12R, 12G, 12B ... Liquid crystal light valve, 12a ... Pixel area, 12e ... Image formation area, 12p ... Pixel, DESCRIPTION OF SYMBOLS 13 ... Projection lens, 14 ... Light valve drive part, 20 ... Control part, 21 ... Memory | storage part, 22 ... Input operation part, 23 ... Image information input part, 24 ... Image processing part, 25 ... OSD processing part, 26 ... Image Correction unit, Ao ... projected image, Pi ... input image, Ps ... corner selection image, Pz ... corner adjustment image, Ta, Tb ... title part, C, C1-C4 ... identification image, Ma, Mb ... message part, Ka, Kb ... key guide part, Z ... enlarged image display part, D ... direction mark, F ... adjusted mark, S ... projection surface.

Claims (5)

A light source;
A light modulation device that modulates the light emitted from the light source to form an image;
A projection optical system for projecting the image formed by the light modulation device;
An identification image display unit that projects and displays a corner selection image including four identification images respectively corresponding to the corners of the four corners of the image;
A selection operation unit for receiving an operation for selecting one of the corner selection images including the four identification images displayed by the identification image display unit;
A highlighting display for displaying the identification image selected by the selection operation unit larger than the other three identification images;
A movement operation unit that receives an operation for moving the corner in a state where the highlighting unit displays the identification image;
An image correction unit configured to move a first corner corresponding to the identification image selected by the selection operation unit and adjust a position of the first corner based on an operation received by the movement operation unit; ,
Equipped with a,
The highlighting unit adds a direction mark corresponding to a direction movable by the movement operation unit to the identification image selected by the selection operation unit, and the first corner is at the limit of the movable range. The projector, wherein the direction mark corresponding to the direction is made inconspicuous in a state where it is positioned and cannot move in a predetermined direction . The projector according to claim 1,
The highlight display unit enlarges and displays the identification image selected by the selection operation unit. The projector according to claim 1 or 2,
The highlighting unit is configured to hide the three identification images that are not selected by the selection operation unit. The projector according to any one of claims 1 to 3 ,
When the movement operation unit accepts a predetermined operation, the identification image display unit returns to a state in which the four identification images are displayed and one of the four identification images is selected. A projector characterized in that the selection operation unit receives an operation again. A light source, a control method of a projector having a projection optical system for projecting a light modulation device to form an image by modulating light emitted from the light source, the image formed in the previous SL light modulator ,
An identification image display step of projecting and displaying a corner selection screen including four identification images respectively corresponding to the corners of the four corners of the image;
A selection operation step of accepting an operation for selecting one of the corner selection images including the four identification images displayed in the identification image display step;
A first highlighting step for displaying the identification image selected in the selection operation step larger than the other three identification images;
A movement operation step for receiving an operation for moving the corner in a state where the identification image is displayed in the highlighting step;
An image correction step of moving the first corner corresponding to the identification image selected in the selection operation step and adjusting the position of the first corner based on the operation received in the movement operation step; ,
A second highlighting step of displaying the identification image selected in the selection operation step again after the image correction step ;
In the first highlighting step and the second highlighting step, a direction mark corresponding to a direction movable in the image correction step is added to the identification image selected in the selection operation step and displayed. ,
In the second highlighting step, when the first corner is located at the limit of the movable range and cannot move in a predetermined direction, the direction mark corresponding to the direction is changed to an inconspicuous display. And a projector control method.

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