JP2006295361A - Projector and method of forming its image - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector which can suppress an OSD image overflowing a display image, and to provide a method of forming its image. <P>SOLUTION: Either of nine positions P1-P9 in a display image forming region 41E is selected, according to the content of the OSD image as a position for forming the OSD image in a pixel region 41A. Here, the positions P1, P3, P7, and P9 are located near each corners of the display image forming region 41E, the positions P2, P4, P6, and P8 are near the middle point of each side of the display image forming region 41E, and the position P5 is at the center of the display image forming region 41E. That is, the positions P1-P9 are set as a relative position to the display image forming region 41E, and is different from the position to the picture element region 41A (for example, the coordinate values in XY coordinates which are set as the origin at the upper left corners AO of the pixel region 41A) in response to the size, the profile and the position of the display image forming region 41E. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a projector that inputs an image signal and projects an image corresponding to the image signal, and an image forming method thereof.

There is known a projector that modulates light emitted from a light source according to an image signal by a light modulation device, and enlarges and projects the modulated light on a screen with a projection lens (for example, a patent document). 1).
The projector described in Patent Document 1 uses an electronic zoom function (which adjusts the size of a screen using an electronic circuit instead of a lens) based on a zoom designation or the like by a user operation. Can be adjusted.
The electronic zoom function performs predetermined processing on an input image signal, and an image corresponding to the image signal (hereinafter referred to as a display image) within a region where light can be modulated in the light modulation device (hereinafter referred to as a modifiable region). The size of the projected image projected on the screen can be changed by changing the size of the area for forming the image (hereinafter referred to as a display image forming area).

JP 2002-365720 A

  However, when including images representing menus and various states when performing image quality adjustment or the like (hereinafter referred to as OSD (on-screen display) images) in a projected image of a projector, generally, a predetermined position in a modifiable region is used. In this way, an OSD image is formed. For this reason, the position of the OSD image with respect to the display image differs between the enlarged state and the reduced state of the projected image, and the OSD image may protrude from the display image. In particular, when the display image forming area can move within the modulatable area, the OSD image protrudes greatly from the display image depending on the position of the display image forming area, so that the visibility of the OSD image decreases. Has the problem.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a projector capable of suppressing an OSD image from protruding from a display image and an image forming method thereof.

  The projector of the present invention is a projector capable of projecting a second image superimposed on a first image corresponding to an input image signal, having a modifiable region capable of modulating light, and emitting from the light source. A light modulation device that modulates the modulated light in the modulatable region to form an image, and a formation that changes the size or shape of the first forming region for forming the first image in the modulatable region An area changing means, an image synthesizing means for setting a second forming area for forming the second image within the modifiable area, and a projection lens for enlarging and projecting the image formed by the light modulation device And the image synthesizing unit changes the position of the second forming region in the modifiable region in accordance with the size or shape of the first forming region changed by the forming region changing unit. It is characterized by .

  According to this projector, the image composition unit changes the position of the second formation region in the modifiable region in accordance with the size or shape of the first formation region changed by the formation region change unit. Regardless of the size or shape of the first formation region, the position of the second formation region relative to the first formation region can be substantially fixed. As a result, it is possible to suppress the second image from protruding from the first image.

  In this projector, when the first forming region whose size or shape has been changed by the forming region changing unit is movable in the modifiable region, a forming region moving unit that moves the first forming region is provided. Preferably, the image synthesizing unit changes the position of the second forming region in the modifiable region in accordance with the position of the first forming region changed by the forming region moving unit.

  According to the projector, the image composition unit changes the position of the second formation region in the modifiable region in accordance with the position of the first formation region changed by the formation region moving unit. Regardless of the position of the formation region, the position of the second formation region relative to the first formation region can be substantially fixed. As a result, it is possible to suppress the second image from protruding from the first image.

  In this projector, it is preferable that the image synthesizing unit further changes the position of the second formation region in accordance with the size of the second formation region.

  According to this projector, since the image composition unit changes the position of the second formation region in the modifiable region in accordance with the size of the second formation region, the second image protrudes from the first image. Can be further suppressed.

  In this projector, the formation area changing unit can make the first formation area trapezoidal in order to correct trapezoidal distortion, and the image synthesizing unit can form the trapezoidal first formation area. It is desirable to define a rectangular area on the top and change the position of the second formation area in the modifiable area in accordance with the size, shape, or position of the rectangular area.

  According to this projector, since the position of the second formation region in the modifiable region is changed according to the size, shape, and position of the rectangular region defined on the trapezoidal first formation region, the first formation is performed. Even when the region is trapezoidal, the position of the second formation region can be determined in the same procedure as when the first formation region is rectangular. As a result, even when the trapezoidal distortion is corrected, the position of the second formation region can be easily determined.

  An image forming method for a projector according to the present invention includes a light modulation device that has a modulatable region capable of modulating light, modulates light emitted from a light source in the modifiable region, and forms an image. An image forming method for a projector capable of projecting a second image on a first image according to a signal, wherein the first image is formed in the modifiable region. A forming region changing step for changing the size or shape of the region; and an image combining step for setting a second forming region for forming the second image in the modifiable region. Is characterized in that the position of the second formation region in the modifiable region is changed in accordance with the size or shape of the first formation region changed in the formation region change step.

  According to the image forming method of the projector, the position of the second formation region in the modifiable region is determined in the image composition step according to the size or shape of the first formation region changed in the formation region change step. Therefore, regardless of the size and shape of the first formation region, the position of the second formation region relative to the first formation region can be substantially fixed. As a result, it is possible to suppress the second image from protruding from the first image.

  In the image forming method of the projector, the first forming area is moved when the first forming area whose size or shape has been changed in the forming area changing step is movable in the modifiable area. A formation region moving step, wherein the image composition step determines the position of the second formation region in the modifiable region according to the position of the first formation region changed in the formation region movement step. It is desirable to change.

  According to the image forming method of the projector, the image composition step changes the position of the second forming region in the modifiable region according to the position of the first forming region changed in the forming region moving step. Therefore, regardless of the position of the first formation region, the position of the second formation region with respect to the first formation region can be substantially fixed. As a result, it is possible to suppress the second image from protruding from the first image.

  In the image forming method of the projector, it is preferable that the image composition step further changes the position of the second formation region in accordance with the size of the second formation region.

  According to the image forming method of the projector, since the image composition step changes the position of the second formation region in the modifiable region according to the size of the second formation region, the second image is the first image. It is possible to further suppress the protrusion of the image.

  In the image forming method of the projector, in the forming region changing step, the first forming region can be formed into a trapezoidal shape in order to correct trapezoidal distortion, and the image compositing step includes the trapezoidal shape. It is desirable that a rectangular area is defined on one forming area, and the position of the second forming area in the modifiable area is changed according to the size, shape, or position of the rectangular area.

  According to the image forming method of the projector, in order to change the position of the second forming region in the modifiable region in accordance with the size, shape, and position of the rectangular region defined on the trapezoidal first forming region, Even when the first formation region is trapezoidal, the position of the second formation region can be determined in the same procedure as when the first formation region is rectangular. As a result, even when the trapezoidal distortion is corrected, the position of the second formation region can be easily determined.

  Further, when the projector and the image forming method described above are constructed using a computer (CPU) provided in the projector, the present invention provides a program for realizing the function, or the program described above. It is also possible to configure in the form of a recording medium recorded so as to be readable by a computer. As recording media, flexible disks, CD-ROMs, magneto-optical disks, IC cards, ROM cartridges, punch cards, printed matter on which codes such as barcodes are printed, 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.

Hereinafter, a projector according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram illustrating a schematic configuration of a projector according to the present embodiment.
The projector 1 according to this embodiment modulates light emitted from a light source according to an image signal input from the outside to form an optical image, and enlarges and projects the formed optical image on a screen. As shown in FIG. 1, the optical device 2 and the control device 3 are provided.

FIG. 2 is a configuration diagram for explaining the details of the optical device 2 and shows an optical path from the light emitted from the light source to the screen.
As shown in FIG. 2, the optical device 2 includes an illumination optical system 10, a color light separation optical system 20, a relay optical system 30, three liquid crystal light valves 40R, 40G, and 40B as light modulation devices, and a cross dichroic. A prism 50 and a projection lens 60 are provided.

  The illumination optical system 10 includes a light source 11, a first lens array 12, a second lens array 13, a polarization conversion element 14, and a superimposing lens 15, and a light bundle emitted from the light source 11 is The minute lenses 12a are divided into a large number of minute light bundles by the first lens array 12 arranged in a matrix. The second lens array 13 and the superimposing lens 15 are provided so that each of the divided light bundles irradiates the entire three liquid crystal light valves 40R, 40G, and 40B that are illumination targets. For this reason, each light bundle is superimposed by the liquid crystal light valves 40R, 40G, and 40B, and the entire liquid crystal light valves 40R, 40G, and 40B are illuminated almost uniformly.

  The polarization conversion element 14 has a function of aligning polarized light having a specific polarization direction so that non-polarized light from the light source 11 can be efficiently used by the liquid crystal light valves 40R, 40G, and 40B. The polarized light emitted from the illumination optical system 10 enters the color light separation optical system 20.

  The color light separation optical system 20 separates the light emitted from the illumination optical system 10 into light of three colors having different wavelength ranges. The first dichroic mirror 21 transmits substantially red light and reflects light having a shorter wavelength than the transmitted light. The red light R that has passed through the first dichroic mirror 21 is reflected by the reflection mirror 22 and illuminates the liquid crystal light valve 40R for red light.

  Of the light reflected by the first dichroic mirror 21, green light G is reflected by the second dichroic mirror 23 and illuminates the liquid crystal light valve 40G for green light. Further, the blue light B passes through the second dichroic mirror 23, passes through the relay optical system 30, and illuminates the liquid crystal light valve 40B for blue light.

  In addition, since the path | route of blue light B becomes long compared with the path | route of other color lights, in order to suppress that the illumination efficiency to liquid crystal light valve 40B falls by the divergence of a light beam, blue light B The relay optical system 30 is provided in the path.

  The relay optical system 30 includes an incident side lens 31, a first reflection mirror 32, a relay lens 33, a second reflection mirror 34, and an emission side lens 35. The blue light B emitted from the color light separation optical system 20 converges in the vicinity of the relay lens 33 by the incident side lens 31 and diverges toward the emission side lens 35.

Each of the liquid crystal light valves 40R, 40G, and 40B includes a liquid crystal panel 41, an incident-side polarizing plate 42, and an emission-side polarizing plate 43, and modulates incident light to form an image (optical image). .
FIG. 3 is a front view of the liquid crystal light valves 40R, 40G, and 40B of the present embodiment.
As shown in FIG. 3, each of the liquid crystal light valves 40R, 40G, and 40B includes a liquid crystal panel 41 in which liquid crystal is sealed between a pair of transparent substrates. Transparent electrodes (pixel electrodes) to which a driving voltage can be applied for each (pixel 41P) are formed in a matrix in a predetermined area (pixel area 41A as a modifiable area). In the liquid crystal light valves 40R, 40G, and 40B of this embodiment, the aspect ratio (Ax: Ay) of the pixel region 41A is 4: 3.

  Returning to FIG. 2, the incident-side polarizing plate 42 and the emitting-side polarizing plate 43 are attached to the incident-side surface and the emitting-side surface of the liquid crystal panel 41, respectively. The incident side polarizing plate 42 and the exit side polarizing plate 43 can transmit only polarized light in a specific polarization direction, respectively, and the incident side polarizing plate 42 transmits polarized light in the polarization direction aligned by the polarization conversion element 14. It is possible. Therefore, most of each color light incident on each of the liquid crystal light valves 40R, 40G, and 40B is transmitted through the incident-side polarizing plate 42 and is incident on the liquid crystal panel 41.

  Here, when a driving voltage corresponding to an image signal is applied to each pixel 41P of the liquid crystal panel 41, the light incident on the pixel region 41A of the liquid crystal panel 41 is modulated according to the driving voltage, and for each pixel 41P. The polarized light has different polarization directions. Of this polarized light, only the polarization component that can be transmitted through the exit-side polarizing plate 43 is emitted from the liquid crystal light valves 40R, 40G, and 40B. That is, the liquid crystal light valves 40R, 40G, and 40B transmit incident light with different transmittances for each pixel 41P according to the image signal, so that an optical image having a gradation is formed for each color light. An optical image composed of each color light emitted from the liquid crystal light valves 40R, 40G, and 40B enters the cross dichroic prism 50.

  The cross dichroic prism 50 combines the optical images of the respective colors emitted from the liquid crystal light valves 40R, 40G, and 40B for each pixel 41P to form an optical image representing a color image. The optical image synthesized by the cross dichroic prism 50 is enlarged and projected by the projection lens 60, and the projection image is displayed on the screen SC or the like.

  On the other hand, as shown in FIG. 1, the control device 3 includes a control unit 70, a storage unit 71, an operation unit 72, a receiver 73, an image quality adjustment unit 74, an image processing unit 75, and an OSD (on-screen display). ) A processing unit 76, an OSD memory 77, and a light valve driving unit 78 are provided.

  The control unit 70 is connected to the units 71, 72, 74 to 76. The control unit 70 is configured by a CPU (Central Processing Unit) or the like as a computer, and performs overall control of the operation of the projector 1 according to a control program stored in the storage unit 71. The control unit 70 outputs a control signal to the image processing unit 75 to instruct the processing content, and outputs a control signal to the region changing unit 70a and the region moving unit 70b and the OSD processing unit 76 to instruct the processing content. A possible OSD control unit 70c and the like are provided.

  The storage unit 71 includes a memory such as a flash ROM (Read Only Memory), and stores the control program and is used for storing various setting values.

  The operation unit 72 includes switches, keys, and the like for performing various operations on the projector 1 such as power on / off and image quality adjustment. Note that the projector 1 according to the present embodiment has an electronic zoom function capable of changing the enlargement / reduction ratio of the projected image, an aspect ratio changing function for changing the aspect ratio of the projected image, and trapezoidal distortion of the projected image caused by tilt projection or the like. Is provided with a trapezoidal distortion correction function, and the operation unit 72 is provided with keys for instructing execution of the respective functions. When the user operates the operation unit 72, the operation unit 72 outputs an operation signal corresponding to the operation content to the control unit 70.

  The receiver 73 receives an analog or digital image signal from an external image supply device (not shown), converts it into image data representing the gradation for each color (R, G, B), and sends it to the image quality adjustment unit 74. Supply.

  The image quality adjustment unit 74 adjusts brightness, contrast, sharpness, hue, and the like for the input image data based on an instruction from the control unit 70 and outputs the image data to the image processing unit 75.

  The image processing unit 75 converts the input image data based on an instruction from the control unit 70, that is, a control signal from the region changing unit 70a and the region moving unit 70b, and each pixel of the liquid crystal light valves 40R, 40G, and 40B. By deriving the gradation value corresponding to 41P, image data composed of the gradation values of all the pixels 41P is generated.

  Here, the control signal output from the area changing unit 70a includes electronic zoom information indicating the enlargement / reduction ratio of the projected image (zoom magnification of the electronic zoom function), aspect ratio information indicating the aspect ratio of the projected image, and trapezoidal distortion of the projected image. Size information consisting of trapezoidal distortion correction information and the like for correcting the image is included, and the control signal output from the area moving unit 70b includes position information indicating the position of the projected image.

  The image processing unit 75 forms a first image corresponding to an image signal (hereinafter referred to as a display image) in the pixel area 41A of the liquid crystal light valves 40R, 40G, and 40B based on the size information. By changing the size and shape of the formation area (hereinafter referred to as the display image formation area), an electronic zoom function, an aspect ratio change function, and a trapezoidal distortion correction function are realized, and the display image formation is performed based on the position information. The projection position of the display image can be changed by moving the position of the area within the pixel area 41A. For this reason, the region changing unit 70a and the image processing unit 75 function as a forming region changing unit of the present invention, and the region moving unit 70b and the image processing unit 75 function as a forming region moving unit of the present invention.

  FIGS. 4A to 4E and FIGS. 5A and 5B are explanatory diagrams for explaining processing in the image processing unit 75. Here, FIGS. 4A to 4E are explanatory diagrams for explaining processing according to size information, and FIGS. 5A and 5B are explanatory diagrams for explaining processing according to position information. In any of the figures, the liquid crystal light valves 40R, 40G, and 40B are viewed from the front side of the light source light incident side.

For example, when the size information from the area changing unit 70a indicates that the enlargement / reduction ratio of the electronic zoom is the maximum value (100%), the aspect ratio is 4: 3, and the keystone distortion correction is not performed, the image processing unit 75 The entire pixel area 41A is set as a display image forming area 41E (see FIG. 4A).
When the enlargement / reduction ratio of the electronic zoom is less than the maximum value, an area having a size corresponding to the enlargement / reduction ratio (Ex / Ax) is set as the display image forming area 41E (see FIG. 4B), and the aspect ratio is 16 : 9, an area having an aspect ratio (Ex: Ey) of 16: 9 is set as a display image forming area 41E (see FIG. 4C). Further, in the case of performing trapezoidal distortion correction with an aspect ratio of 4: 3, a display image forming region 41E is defined as a trapezoidal region in which a projected image has a rectangular shape with an aspect ratio of 4: 3 (FIG. 4 ( d)). FIG. 4E shows a display image forming area 41E when the keystone distortion correction is performed with an electronic zoom enlargement / reduction ratio less than the maximum value and an aspect ratio of 16: 9.

  The position information from the area moving unit 70b is information indicating the moving direction of the display image forming area 41E in the pixel area 41A, and the user can use the direction instruction key provided on the operation unit 72 to display the display image forming area. When the movement direction of 41E is instructed, the area moving unit 70b outputs the instruction to the image processing unit 75 as position information. The image processing unit 75 moves the display image forming area 41E in the designated direction (for example, the + X direction) as shown in FIGS. 5A and 5B in accordance with the input position information. In the present embodiment, the display image forming area 41E is moved by a predetermined number of pixels in the indicated direction by a single key operation (direction instruction), and the user repeatedly or continuously operates the direction instruction key to obtain a desired value. It can be moved by the amount. However, when the display image forming area 41E reaches the boundary of the pixel area 41A, the movement in the direction cannot be performed even if the direction instruction is continued.

  As described above, the image processing unit 75 determines the size, shape, and position of the display image forming area 41E in the pixel area 41A of the liquid crystal light valves 40R, 40G, and 40B, and then thins out the input image data. A gradation value corresponding to each pixel 41P of the display image forming area 41E is generated by performing processing and complement processing. In addition, the gradation value of the pixel 41P in the invalid area 41N (area other than the display image formation area 41E in the pixel area 41A) that does not contribute to image formation is set to 0 (value that minimizes the transmittance) in the pixel area 41A. The image data composed of the gradation values of all the pixels 41 </ b> P is generated, and the generated image data is output to the OSD processing unit 76.

  Returning to FIG. 1, the OSD processing unit 76, based on an instruction from the control unit 70, that is, a control signal from the OSD control unit 70 c, a second image made up of a menu image, a message image, etc. (hereinafter referred to as OSD image). Is performed on the display image. Specifically, the OSD control unit 70c outputs OSD image information for specifying an OSD image to be displayed to the OSD processing unit 76. The OSD processing unit 76 reads out OSD image data corresponding to the OSD image information from the OSD memory 77, and combines the OSD image data with the input image data so that the OSD image is superimposed at a predetermined position of the display image. . That is, the OSD control unit 70c and the OSD processing unit 76 function as an image composition unit of the present invention.

  FIGS. 6A to 6C illustrate the position (hereinafter referred to as the OSD formation position) of the second formation area (hereinafter referred to as the OSD formation area) for forming the OSD image in the pixel area 41A. (A) is a case where the entire pixel area 41A is the display image forming area 41E, (b) is a case where the display image forming area 41E having an aspect ratio of 16: 9 is reduced and moved, (c) These show the case where trapezoidal distortion correction is performed, that is, the case where the display image forming area 41E is trapezoidal.

  As shown in FIGS. 6A and 6B, in the present embodiment, any one of nine positions P1 to P9 in the display image forming area 41E corresponds to the contents of the OSD image as the OSD forming position. It is to be selected. For example, when the input source name is displayed as an OSD image, the upper right (position P3) in the display image formation area 41E, and when various menus and help screens are displayed, the center (position in the display image formation area 41E). P5) When displaying various warning messages, lower left (position P7) in the display image forming area 41E, and when displaying a gauge such as a volume gauge, the lower center (position P8) in the display image forming area 41E. Is selected as the OSD formation position.

  Here, the positions P1, P3, P7, and P9 are near the corners of the display image forming area 41E, and the positions P2, P4, P6, and P8 are near the midpoint of each side of the display image forming area 41E. , Position P5 is the center of the display image forming area 41E. That is, each of the positions P1 to P9 is determined as a relative position with respect to the display image forming area 41E, and the position (for example, the pixel area 41A of the pixel area 41A) is determined according to the size, shape, and position of the display image forming area 41E. The coordinate values in XY coordinates with the upper left corner A0 as the origin are different.

  As shown in FIG. 6C, the OSD formation position in the case of performing the trapezoidal distortion correction is shorter among the upper and lower bases of the trapezoidal display image forming area 41E and the upper and lower bases. It is determined as a relative position with respect to a rectangular area surrounded by a perpendicular line extending from both ends of the side to the longer side. That is, the positions P1, P3, P7, and P9 when performing trapezoidal distortion correction are near the corners of the rectangular area, and the positions P2, P4, P6, and P8 are near the midpoints of the sides of the rectangular area. , Position P5 is the center of the rectangular area.

FIGS. 7A to 7C are explanatory diagrams showing the OSD formation region. As a specific example, the upper left (position P1) of the display image formation region 41E shown in FIGS. The case where it is set as the formation position is shown.
As shown in FIGS. 7A to 7C, depending on the size, shape, and position of the display image formation area 41E, the position of the OSD formation area 41S relative to the pixel area 41A (for example, the upper left corner A0 of the pixel area 41A is the origin. The coordinate values (S0x, S0y) of the upper left corner (S0) of the OSD formation area 41S in the XY coordinates are different.

  Returning to FIG. 1, the image data synthesized by the OSD processing unit 76 is output to the light valve driving unit 78. Note that when the OSD image is not displayed, the above synthesis processing is not performed, and thus the image data output from the image processing unit 75 is supplied to the light valve driving unit 78 as it is.

  The light valve driving unit 78 drives the liquid crystal light valves 40R, 40G, and 40B based on the image data input from the OSD processing unit 76. That is, an image is formed in the display image forming area 41E of the liquid crystal light valves 40R, 40G, and 40B by applying a driving voltage corresponding to each gradation value to each pixel 41P in the pixel area 41A. When light from the light source is irradiated onto the bulbs 40R, 40G, and 40B, a projected image is displayed on the screen SC.

FIGS. 8A to 8C are front views showing the projected images displayed on the screen SC, and show the projected images projected from the pixel area 41A shown in FIGS. 7A to 7C, respectively. ing.
When the entire pixel area 41A is the display image forming area 41E (see FIG. 7A), as shown in FIG. 8A, the screen SC is irradiated with light that has passed through the pixel area 41A (hereinafter, “ The display image GE is displayed over the entire projection area GA. When the display image forming area 41E having an aspect ratio of 16: 9 is reduced and moved (see FIG. 7B), as shown in FIG. 8B, the aspect ratio of the display image forming area 41E or The display image GE is displayed at a position corresponding to the amount of movement of the display image forming area 41E with a shape and size corresponding to the enlargement / reduction ratio. When trapezoidal distortion correction is performed (see FIG. 7C), as shown in FIG. 8C, the projection area GA is distorted into a trapezoidal shape, but the display image GE is displayed in a substantially rectangular shape. The Here, the region GN outside the display image GE in the projection region GA in FIGS. 8B and 8C is a region corresponding to the invalid region 41N in which the transmittance of the pixel 41P is set to the minimum. It becomes a black area where light is hardly irradiated. In each figure, the OSD image GS is superimposed on the upper left of the display image formation area 41E corresponding to the OSD formation area 41S.

Here, a method of determining the position of the OSD formation region 41S with respect to the pixel region 41A will be described in detail.
When OSD image information is input from the OSD control unit 70 c, the OSD processing unit 76 reads out OSD image data based on the OSD image information from the OSD memory 77. The OSD memory 77 displays the OSD image size information, that is, the horizontal dimension Sx and the vertical dimension Sy (hereinafter referred to as OSD size information) of the OSD formation area 41S, and the OSD image in association with each OSD image data. OSD position information (information indicating any one of P1 to P9 shown in FIG. 6) indicating the relative position (OSD formation position) is stored, and the OSD processing unit 76 stores the OSD image data from the OSD memory 77. At the same time, OSD size information and OSD position information are acquired.

  Further, the OSD processing unit 76 inputs position information and size information of the display image forming area 41E from the image processing unit 75. Specifically, when the display image forming area 41E has a rectangular shape, as information representing the position of the display image forming area 41E, for example, as shown in FIG. 4 or FIG. The coordinate value (E0x, E0y) of the upper left corner (reference point E0) of the display image formation area 41E in the XY coordinates with A0 as the right direction and the + X direction as the right direction and the + Y direction as the downward direction is acquired. As the information representing the size, the horizontal dimension Ex and the vertical dimension Ey are acquired. On the other hand, when the display image forming area 41E has a trapezoidal shape, that is, when performing trapezoidal distortion correction, as shown in FIGS. 9A to 9D, the upper and lower sides of the trapezoidal display image forming area 41E are displayed. The upper left corner of a rectangular area surrounded by the bottom and a perpendicular drawn from both ends of the shorter side to the longer side of the upper and lower bases is defined as a reference point E0, and its coordinate value (E0x, E0y) and the horizontal dimension Ex and the vertical dimension Ey of the rectangular area are acquired.

The OSD processing unit 76 reads the OSD formation area dimensions Sx, Sy and OSD position information (any one of P1 to P9) read from the OSD memory 77, and the coordinate value of the reference point E0 acquired from the image processing unit 75 ( E0x, E0y) and the dimensions Ex, Ey of the display image formation area 41E (or rectangular area) determine the position of the OSD formation area 41S relative to the pixel area 41A.
10 to 12 are explanatory diagrams for explaining a method of determining the position of the OSD formation area 41S with respect to the pixel area 41A, and examples where the OSD formation positions indicated by the OSD position information are positions P1, P5, and P9, respectively. FIG.

As shown in FIG. 10, when the OSD formation area 41S is set at the position P1 (see FIG. 6), the upper left corner of the OSD formation area 41S (hereinafter referred to as the OSD reference point S0) is the display image formation area 41E. The reference point E0 is determined so as to be positioned at a distance C _{L in} the X direction and a distance C _{T in the} Y direction. Here, the distances C _L and C _T are the left end offset amount and the upper end offset amount of the OSD forming area 41S with respect to the display image forming area 41E, respectively, and the OSD image GS is displayed in contact with the end (boundary) of the display image GE. This is a gap for displaying the OSD image GS at a predetermined distance from each end portion in order to suppress a decrease in visibility due to being performed.

That is, the coordinates (S0x, S0y) of the OSD reference point S0 when setting the OSD formation region 41S at the position P1 can be expressed by the following equations.
S0x = E0x + C _L (1)
S0y = E0y + C _T (2)
The X coordinate S0x of the OSD reference point S0 when the OSD formation position is the positions P4 and P7 is also expressed by the above equation (1), and the OSD reference point S0 when the OSD formation position is the positions P2 and P3. The Y coordinate S0y is also expressed by the above formula (2).

As shown in FIG. 11, when the OSD formation area 41S is set at the center of the display image formation area 41E, that is, at the position P5 (see FIG. 6), the center of the display image formation area 41E and the OSD formation area 41S. So that it matches the center of. At this time, the coordinates (S0x, S0y) of the OSD reference point S0 can be expressed by the following equations.
S0x = E0x + Ex / 2−Sx / 2 (3)
S0y = E0y + Ey / 2-Sy / 2 (4)
Note that the X coordinate S0x of the OSD reference point S0 when the OSD formation position is the positions P2 and P8 is also expressed by the above equation (3), and the OSD reference point S0 when the OSD formation position is the positions P4 and P6. The Y coordinate S0y is also expressed by the above formula (4).

Further, as shown in FIG. 12, when the OSD formation area 41S is set at the lower right of the display image formation area 41E, that is, at the position P9 (see FIG. 6), the lower right corner of the OSD formation area 41S is formed as a display image. It is determined to be located at a distance C _R (right end offset amount) in the X direction and a distance C _B (lower end offset amount) in the Y direction from the lower right corner of the region 41E. At this time, the coordinates (S0x, S0y) of the OSD reference point S0 can be expressed by the following equations.
S0x = E0x + Ex−C _R −Sx (5)
S0y = E0y + Ey−C _B −Sy (6)
The X coordinate S0x of the OSD reference point S0 when the OSD formation positions are positions P3 and P6 is also expressed by the above equation (5), and the OSD reference point S0 when the OSD formation positions are positions P7 and P8. The Y coordinate S0y is also expressed by the above formula (6).

When the large OSD formation area 41S is set in a state where the display image formation area 41E is reduced by the electronic zoom function, the OSD formation area 41S may protrude from the display image formation area 41E.
FIG. 13 is an explanatory diagram illustrating an example in which the OSD formation area 41S protrudes from the display image formation area 41E. FIG. 13A illustrates a case where the display image formation area 41E is substantially at the center of the pixel area 41A. Indicates a case where the display image forming area 41E is positioned so as to be in contact with the boundary of the pixel area 41A. The OSD formation area 41S is arranged at the center (position P5) of the display image formation area 41E, and the coordinate values (S0x, S0y) of the OSD reference point S0 are expressed by the above equations (3) and (4). ). Here, as shown in FIG. 13A, since the horizontal width Sx of the OSD formation area 41S is larger than the horizontal width Ex of the display image formation area 41E, the OSD formation area 41S protrudes from the left and right of the display image formation area 41E. .

  However, as shown in FIG. 13B, when the OSD formation area 41S is set in a state where the display image formation area 41E is in contact with the left boundary of the pixel area 41A, it is calculated by the above equation (3). The X coordinate value S0x becomes a negative value. Thus, when the coordinate values calculated by the above formulas (1) to (6) are outside the pixel area 41A, that is, the coordinate values S0x and S0y are negative values, or the OSD reference point When the coordinate values S0x + Sx and S0y + Sy of the diagonal point S1 of S0 exceed the dimensions Ax and Ay of the pixel area 41A, respectively, it is necessary to perform correction so that the OSD formation area 41S is within the pixel area 41A. In this embodiment, when S0x <0, S0x = 0, when S0y <0, S0y = 0, when S0x + Sx> Ax, S0x = Ax−Sx, and when S0y + Sy> Ay, S0y = By setting to Ay-Sy, as shown in FIG. 13B, the OSD formation region 41S is accommodated in the pixel region 41A.

  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, as shown in the above formulas (3) to (6), the size or shape of the display image forming area 41E changed by the image processing unit 75 by the OSD processing unit 76. That is, since the position (coordinate values S0x, S0y) of the OSD formation area 41S in the pixel area 41A is changed according to the horizontal dimension Ex and the vertical dimension Ey, the display is performed regardless of the size and shape of the display image formation area 41E. The relative position of the OSD formation area 41S with respect to the image formation area 41E can be substantially fixed. As a result, it is possible to suppress the OSD image GS from protruding from the display image GE.

  (2) According to the projector 1 of the present embodiment, as shown in the above formulas (1) to (6), the OSD processing unit 76 changes the position of the display image forming area 41E changed by the image processing unit 75, that is, In order to change the position of the OSD formation area 41S (coordinate values S0x, S0y) in the pixel area 41A according to the coordinate values E0x, E0y of the reference point E0, the display image formation is performed regardless of the position of the display image formation area 41E. The relative position of the OSD formation area 41S with respect to the area 41E can be substantially fixed. As a result, it is possible to suppress the OSD image GS from protruding from the display image GE.

  (3) According to the projector 1 of the present embodiment, as shown in the above formulas (3) to (6), the OSD processing unit 76 corresponds to the size (horizontal dimension Sx, vertical dimension Sy) of the OSD formation region 41S. Thus, since the position (coordinate values S0x, S0y) of the OSD formation area 41S in the pixel area 41A is changed, it is possible to further suppress the OSD image GS from protruding from the display image GE.

  (4) According to the projector 1 of the present embodiment, when trapezoidal distortion correction is performed, OSD formation in the pixel area 41A is performed according to the size, shape, and position of the rectangular area defined on the trapezoidal display image formation area 41E. Since the position of the area 41S is changed, the position (coordinate values S0x, S0y) of the OSD formation area 41S can be determined by the same procedure as when the display image formation area 41E has a rectangular shape. As a result, even when the trapezoidal distortion is corrected, the position of the OSD formation region 41S can be easily determined.

(Modification)
In addition, you may change embodiment of this invention as follows.
In the embodiment, the OSD formation position is selected from the nine positions P1 to P9 in the display image formation area 41E. However, the OSD formation position is not limited to the nine positions. The number may be determined as appropriate.

  In the above-described embodiment, a method of determining a rectangular area when performing vertical or horizontal trapezoidal distortion correction (see FIG. 9) is shown. However, the projector 1 is distorted in an arbitrary direction, that is, trapezoidal distortion in the vertical direction. A rectangular region may be determined as appropriate even when a distortion obtained by combining the horizontal trapezoidal distortion and the horizontal distortion can be corrected. For example, as shown in FIG. 14, a line parallel to the X axis and the Y axis is drawn from each vertex of the display image forming area 41E into the display image forming area 41E, and the area surrounded by these parallel lines is defined as a rectangular area. Also good.

In the embodiment, when trapezoidal distortion correction is performed, the longer side from both ends of the shorter side of the upper and lower bases of the trapezoidal display image forming region 41E and the upper and lower bases The position of the OSD formation area 41S is determined based on a rectangular area shape surrounded by a perpendicular line drawn downward, but the method of determining the rectangular area is not limited to the above. In addition, it is not always necessary to define a rectangular area, and for example, each vertex of the trapezoid (display image forming area 41E) or a midpoint of each side may be used as a reference.
In the case where the position of the OSD formation area 41S is determined based on the rectangular area defined on the trapezoidal display image formation area 41E as in the above-described embodiment, the offset amount C is determined according to the OSD formation positions P1 to P9. _L , C _R , C _T , and C _B may be increased or decreased. For example, as shown in FIG. 6, at the position P1 and the position P7, the distance between the left boundary line (hypotenuse) of the display image forming area 41E becomes different, by increasing or decreasing the left offset amount C _L, left The distance from the boundary line can be made substantially uniform.

  In the embodiment, the electronic zoom function, the aspect ratio change function, and the trapezoidal distortion correction function can all be executed by the user operating the operation unit 72 and instructing, for example, an input image An aspect ratio recognizing unit capable of recognizing the aspect ratio of the signal may be provided so that the aspect ratio of the projected image can be changed in conjunction with the input of the image signal. In addition, a tilt detection unit that can detect the tilt of the projector and a trapezoidal distortion detection unit that can recognize the shape of the projected image may be provided, and the trapezoidal distortion correction may be performed in conjunction with these detection operations.

  In the above-described embodiment, the size, shape, and position of the display image formation area 41E are determined in the pixel area 41A, the image data including the gradation values of all the pixels 41P in the pixel area 41A is generated, and then the OSD formation area Although the OSD image data is synthesized by setting 41S, the synthesis order is not limited to the above. For example, the OSD formation area 41S is determined according to the size, shape, and position of the display image formation area 41E, and after the OSD image data is set in the OSD formation area 41S, the image data representing the display image is synthesized. Also good.

  In the above-described embodiment, the transmissive liquid crystal light valves 40R, 40G, and 40B are used as the light modulator, but it is also possible to use a liquid crystal on silicon (LCOS) that is a reflective light modulator. is there. Further, a DMD (registered trademark of Texas Instruments) (digital micromirror device) that modulates the light emitted from the light source by controlling the emission direction of the incident light for each micromirror as a pixel is used. You can also.

1 is a block diagram showing a schematic configuration of a projector according to an embodiment. The block diagram for demonstrating the detail of an optical apparatus. The front view of a liquid crystal light valve. (A)-(e) is explanatory drawing for demonstrating the process according to the size information in an image process part. (A), (b) is explanatory drawing for demonstrating the process according to the positional information in an image process part. (A)-(c) is explanatory drawing explaining an OSD formation position. (A)-(c) is explanatory drawing which shows an OSD formation area. (A)-(c) is a front view which shows the projection image displayed on the screen. (A)-(d) is explanatory drawing which shows the rectangular area | region in the case of performing trapezoid distortion correction. Explanatory drawing explaining the determination method of the position of the OSD formation area with respect to a pixel area. Explanatory drawing explaining the determination method of the position of the OSD formation area with respect to a pixel area. Explanatory drawing explaining the determination method of the position of the OSD formation area with respect to a pixel area. (A), (b) is explanatory drawing which shows the example in case an OSD formation area protrudes from a display image formation area. Explanatory drawing which shows the rectangular area | region in the case of correct | amending the distortion | strain which the trapezoid distortion of the vertical direction and the trapezoid distortion of the horizontal direction were synthesize | combined.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Optical apparatus, 3 ... Control apparatus, 10 ... Illumination optical system, 11 ... Light source, 12 ... 1st lens array, 13 ... 2nd lens array, 14 ... Polarization conversion element, 15 ... Superimposition lens , 20 ... color light separation optical system, 21 ... dichroic mirror, 22 ... reflection mirror, 23 ... dichroic mirror, 30 ... relay optical system, 31 ... incident side lens, 32 ... reflection mirror, 33 ... relay lens, 34 ... reflection mirror, 35 ... Exit-side lens, 40R, 40G, 40B ... Liquid crystal light valve, 41 ... Liquid crystal panel, 41A ... Pixel area, 41E ... Display image forming area, 41N ... Invalid area, 41P ... Pixel, 41S ... OSD forming area, 42 ... Incident side polarizing plate, 43... Emission side polarizing plate, 50... Cross dichroic prism, 60... Projection lens, 70. 0b ... Area moving unit, 70c ... OSD control unit, 71 ... Storage unit, 72 ... Operating unit, 73 ... Receiver, 74 ... Image quality adjusting unit, 75 ... Image processing unit, 76 ... OSD processing unit, 77 ... OSD memory, 78 ... light valve driving unit, GA ... projection area, GE ... display image, GS ... OSD image.

Claims (8)

A projector capable of projecting a second image superimposed on a first image corresponding to an input image signal,
A light modulation device having a modulatable region capable of modulating light, and forming an image by modulating light emitted from a light source in the modifiable region;
A formation region changing means for changing the size or shape of the first formation region for forming the first image in the modifiable region;
Image synthesizing means for setting a second forming area for forming the second image in the modifiable area;
A projection lens for enlarging and projecting an image formed by the light modulation device;
And the image synthesizing unit changes the position of the second forming region in the modifiable region according to the size or shape of the first forming region changed by the forming region changing unit. Projector. The projector according to claim 1,
Forming region moving means for moving the first forming region when the first forming region whose size or shape has been changed by the forming region changing unit is movable in the modifiable region;
The image synthesizing unit changes the position of the second forming region in the modifiable region according to the position of the first forming region changed by the forming region moving unit. .   3. The projector according to claim 1, wherein the image synthesizing unit further changes the position of the second formation area in accordance with the size of the second formation area.   4. The projector according to claim 1, wherein the formation region changing unit can make the first formation region trapezoidal in order to correct trapezoidal distortion, The image composition means defines a rectangular area on the trapezoidal first forming area, and determines the position of the second forming area in the modifiable area according to the size, shape, or position of the rectangular area. A projector characterized by changing. A light modulation device that has a modulatable area capable of modulating light, modulates light emitted from a light source in the modulatable area to form an image, and a first image corresponding to an input image signal, An image forming method for a projector capable of superimposing and projecting a second image,
A forming region changing step of changing the size or shape of the first forming region for forming the first image in the modifiable region;
An image composition step for setting a second formation region for forming the second image in the modifiable region;
And the image synthesizing step changes the position of the second forming region in the modifiable region according to the size or shape of the first forming region changed in the forming region changing step. An image forming method for a projector. The projector image forming method according to claim 5,
A formation region moving step of moving the first formation region when the first formation region whose size or shape has been changed in the formation region change step is movable in the modifiable region;
In the image composition step, the position of the second formation region in the modifiable region is changed according to the position of the first formation region changed in the formation region movement step. Projector image forming method.   7. The image forming method for a projector according to claim 5, wherein the image composition step further changes the position of the second formation region in accordance with the size of the second formation region. An image forming method for a projector. 8. The image forming method for a projector according to claim 5, wherein in the forming region changing step, the first forming region can be trapezoidal in order to correct trapezoidal distortion. In the image composition step, a rectangular area is defined on the trapezoidal first formation area, and the second formation in the modifiable area is determined according to the size, shape, or position of the rectangular area. An image forming method for a projector, characterized by changing a position of an area.

Images