JP2006317559A - Projection type image display apparatus and image display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To optimally adjust a projecting direction by linking a lens shift function and the attitude alteration of a housing. <P>SOLUTION: A projector 10 has a lens shifting section 15 for moving a projection lens 12 in X direction and Z direction, and also an adjusting leg section 16 for rotating the housing 11 around a vertical axis V and a horizontal axis H. Upon an operation instruction to alter a projecting direction, given by a user through a manual operation, the projector 10 first moves the projection lens 12 in a direction corresponding to the operation instruction. When the projection lens 12 is moved to its movable limit, the projector 10 next rotates the housing 11 in the direction corresponding to the operation instruction, thereby adjusting the projecting direction such that a lens shift function designed to minimize deterioration of a display image is utilized to the maximum. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a projection type image display apparatus and an image display method that facilitate adjustment of a projection direction and that can ensure an optimal display form in conjunction with adjustment of the projection direction.

  2. Description of the Related Art Conventionally, there is a projection type image display device (projector) that projects modulated light representing an image onto a (projected body) such as a screen and displays the image on a screen or the like. As shown in FIG. 12, it is generally preferable that the projector 1 is installed so that the projection lens 1a faces the screen S and displays the image 2 on the screen S. However, depending on the situation of the installation location, the screen S In some cases, the projector 1 cannot be installed so that the projection lens 1a faces each other.

  There are also devices equipped with a lens shift function so that display can be performed on the screen even when they cannot be placed facing each other. The lens shift function is a function in which the projection lens 1a can be moved linearly in the horizontal and vertical directions. For example, when the installation condition of the projector 1 is restricted as shown in FIG. 13A and the optical axis K of the projection lens 1a cannot coincide with the center of the screen S, the projection lens 1a as shown in FIG. Is moved (shifted) in the direction of the white arrow in the figure, the image 3 can be displayed in the screen S with the optical axis K aligned with the center of the screen S (see Patent Document 1).

Further, depending on the situation, the projector 1 may have to be installed obliquely with respect to the screen S. Under such installation conditions, distortion (trapezoidal distortion) occurs in the displayed image, but there is also an apparatus having a function of automatically correcting image distortion (trapezoidal distortion) (see Patent Documents 2 and 3). Furthermore, in order to adjust the projection direction so that the occurrence of trapezoidal distortion can be suppressed in any installation situation, a device provided with a lens shift function, a function to change the direction of the device housing, a camera for imaging the projection direction, etc. Is disclosed (see Patent Document 4).
JP 2005-49680 A JP-A-4-335740 JP 2000-241874 A Japanese Patent Laid-Open No. 2004-341029

  In the apparatus having the lens shift function according to Patent Document 1, since the range in which the projection lens can move is limited to a certain size, there is a problem that the projection direction cannot be adjusted beyond the movable range.

  Further, in the apparatus for correcting trapezoidal distortion according to Patent Documents 2 and 3, the trapezoidal distortion displayed on the screen S by the projection from the projector 1 installed obliquely with respect to the screen S as shown in FIG. First, the image 4 having the shape is deformed into a rectangular shape as shown in FIG. 14B by trapezoidal distortion correction, and then zoomed (enlarged) as shown in FIG. 14C.

  For this reason, as shown in FIG. 14B, the image 4 ′ subjected to the trapezoidal distortion correction is not the entire element range of the light modulation element such as a liquid crystal panel that generates the modulated light representing the image, but a part of the elements. The image 4 ″ in FIG. 14 (c), which corresponds to the range and is enlarged from the image 4 ′, has a coarser image quality (rougher lattice) than the image 4 in FIG. 14 (a), and has a trapezoidal distortion. The display associated with the correction has a problem that resolution degradation is inevitable.In the apparatus according to Patent Documents 2 and 3, means or display for detecting the distance to the screen S in order to automatically correct the trapezoidal distortion. Means for capturing the image and the screen S are indispensable, and there is also a problem that the processing load on the projector 1 is heavy because the trapezoidal distortion correction is performed based on the processing result of each means.

  Furthermore, in the apparatus according to Patent Document 4, when adjusting the projection direction, first, the vertical and horizontal directions and the horizontal inclination direction of the projector body (apparatus housing) are determined, and then the lens shift function is activated and the zoom / Since this is a control procedure for displaying an image on the screen by performing focus adjustment and distortion correction processing, the projection direction may not be adjusted so that the resolution of the display image does not deteriorate.

  That is, since the lens shift function linearly moves the projection lens 1a, the angle of the optical axis K with respect to the screen S does not change as shown in FIGS. 13A and 13B (in FIGS. 13A and 13B). 90 degrees constant). There is little deterioration in image quality. On the other hand, changing the direction of the apparatus casing is equivalent to the situation shown in FIG. 14A, and the angle of the optical axis K with respect to the screen S increases (90 degrees + angle A). When adjusted, the image quality becomes coarse. Therefore, since the lens shift function is activated after the image quality becomes coarse, the lens shift function with little deterioration in image quality may not be utilized to the maximum extent.

  Moreover, since it is assumed that the apparatus according to Patent Document 4 automatically adjusts the projection direction, the direction of the apparatus housing is changed with respect to the case where the projection direction is changed based on a user's manual operation. Since the function and the lens shift function are not linked to each other, there is a problem that the projection direction cannot be optimally adjusted by suppressing the deterioration of the image quality with an easy manual operation.

The present invention has been made in view of such problems, and by appropriately linking the lens shift function and the function of changing the direction of the apparatus housing, the image generation capability of the light modulation element in any installation situation It is an object of the present invention to provide a projection type image display apparatus and an image display method that can perform optimum projection direction adjustment by pulling out the image.
The present invention also provides a projection-type image display device and an image which can be automatically performed without reducing the processing load of distortion correction for a display image without depending on the means for detecting the distance to the screen and the imaging means. An object is to provide a display method.

  In order to solve the above problems, a projection-type image display device according to the present invention includes a light modulation element housed in a housing, a projection lens that projects modulated light representing an image generated by the light modulation element, and A projection-type image display apparatus that includes a lens moving unit that moves the projection lens so as to change the projection direction, and displays an image on a projection target by projecting modulated light from the projection lens. A housing orientation changing means for changing the orientation of the housing, a receiving means for accepting a change instruction for the projection direction, and when the accepting means accepts the change instruction, the lens moving means projects the projection according to the change instruction. The projection lens is moved in the direction, and when the projection lens is moved to the movable limit, the casing attitude changing means changes the attitude of the casing in the projection direction according to the change instruction. The features.

In the projection-type image display device according to the present invention, the accepting unit accepts a change stop instruction, and when the accepting unit accepts a change stop instruction during the movement of the projection lens, the lens movement The means is characterized in that the movement of the projection lens is stopped.
Further, in the projection type image display device according to the present invention, when the accepting unit accepts a change stop instruction during the change in the posture of the casing, the casing posture changing unit stops the change in the posture of the casing. It is characterized by being.

  Furthermore, the projection-type image display apparatus according to the present invention includes an imaging unit that captures the projection direction, and an image related to the projection based on the captured image captured by the imaging unit when the reception unit receives a change instruction. A determination unit that determines whether or not the image is displayed in the projection target; and when the projection unit determines that an image related to the projection is displayed in the projection target during the movement of the projection lens, the lens movement unit The movement of the projection lens is stopped.

  In the projection type image display device according to the present invention, when the determination unit determines that the image related to the projection is displayed in the projection body during the change of the posture of the case, the case posture change unit The posture change of the casing is stopped.

Further, in the projection type image display apparatus according to the present invention, the lens moving means moves the projection lens in the horizontal direction, and the case posture changing means is the case about the vertical axis. Is characterized in that it is rotated.
Still further, in the projection type image display apparatus according to the present invention, the lens moving means moves the projection lens in the vertical direction, and the housing posture changing means has a housing around a horizontal axis. It is characterized by rotating the body.

  The projection-type image display apparatus according to the present invention further includes a distortion correction unit that performs distortion correction of an image related to the projection according to the amount of change in the posture of the housing by the housing posture change unit.

  The image display method according to the present invention is capable of moving the projection lens and changing the attitude of the casing so as to change the projection direction, and modulating light representing an image generated by the light modulation element in the casing from the projection lens. An image display method for a projection-type image display device that projects and displays an image on an object to be projected. When the projection-type image display device receives an instruction to change a projection direction, the projection direction according to the change instruction And a step of changing the posture of the housing in a projection direction according to the change instruction when the projection lens moves to a movable limit.

  Further, in the image display method according to the present invention, when the projection type image display apparatus changes the attitude of the casing, the image correction method includes a step of correcting distortion of the image related to the projection according to the attitude change amount of the casing. It is characterized by providing.

  In the present invention, when an instruction to change the projection direction is received, the projection lens is first moved, and the projection lens is moved to the movable limit at the end of the movement range, and then the posture of the housing is changed. The lens shift function and the function of changing the direction of the housing operate in a step-by-step manner. As a result, the image generation capability of the optical modulation element can be maximized, and the degree of image quality degradation due to adjustment of the projection direction can be suppressed.

  In the present invention, when the accepting unit accepts the change stop instruction during the movement of the projection lens, the movement of the projection lens stops, so that the projection direction can be smoothly adjusted based on the manual operation of the user. Thus, at the stage of movement of the projection lens, the movement of the projection lens can be reliably controlled based on the user's operation.

  In the present invention, when the accepting unit accepts the change stop instruction during the change in the posture of the casing, the change in the posture of the casing is stopped, so that the projection direction can be reliably adjusted based on the manual operation of the user. As a result, even when the posture of the housing is changed, the posture change of the housing can be easily controlled based on a user operation.

  In the present invention, the image pickup means is provided, and the movement of the projection lens is stopped when the image related to the projection is displayed in the predetermined projection body during the movement of the projection lens, so the movement is started. Thus, it is possible to automatically stop the projection lens, and it is possible to automatically complete the adjustment of the projection direction so that the image generation capability of the optical modulation element can be pulled out to the maximum.

  In the present invention, if the image related to the projection is displayed in the predetermined projection body during the change in the posture of the case, the change in the posture of the case is stopped. Can be automatically stopped, and the completion of adjustment of the projection direction that proceeds in stages can be automatically controlled.

In the present invention, the projection lens is moved in the horizontal direction and the casing is rotated around the vertical axis, so that the projection direction can be freely adjusted in either the left or right direction in the horizontal direction. It becomes like this.
In the present invention, the projection lens is moved in the vertical direction and the casing is rotated about the horizontal axis, so that the projection direction can be adjusted smoothly in any direction in the vertical direction. It becomes like this. In addition, when combining a configuration that can adjust the projection direction in either the left or right direction and a configuration that can adjust the projection direction in any direction of the top or bottom, the projection direction can be freely set in an oblique direction such as upper left, lower left, upper right, or lower right. Can be adjusted.

  In the present invention, since the distortion correction of the image related to the projection is performed according to the amount of change in the attitude of the housing, the distance detection means to the screen, the imaging means, etc., which have been required in the past, become unnecessary, and the distortion correction In addition to reducing the processing burden, distortion correction processing can be performed automatically. It should be noted that an arithmetic expression that specifies the relationship between the posture change amount and the distortion correction amount, or a table that defines the correspondence between the two is used for the projection type image so that the distortion correction processing can be performed in association with the posture change amount of the housing. By storing in advance in the display device and determining the distortion correction amount based on an arithmetic expression or a table, the processing load can be reduced and the processing speed can be improved. In addition, distortion correction may be performed on an image that is displayed simultaneously with the change in the posture of the housing, and the distortion correction processing that is performed simultaneously with the change in the posture of the housing makes the user unaware of the distortion correction. It is possible to adjust the projection direction.

  In the present invention, when changing the projection direction, first the projection lens is moved, the projection lens is moved to the movable limit, and then the orientation of the housing is changed to change the lens shift function and the orientation of the housing. Therefore, the image generation capability of the optical modulation element can be maximized, and image quality deterioration due to adjustment of the projection direction can be minimized.

In the present invention, when the accepting unit accepts the change stop instruction during the movement of the projection lens, the movement of the projection lens is stopped. Therefore, even in the manual operation, the user can surely set the projection direction without being aware of the operation target. Can be adjusted.
In the present invention, when the accepting unit accepts the change stop instruction during the change in the posture of the casing, the change in the posture of the casing is stopped, so that the projection direction can be easily adjusted by manual operation.

In the present invention, if the image related to the projection is displayed in the predetermined projection body during the movement of the projection lens, the movement of the projection lens is stopped. To be stopped.
In the present invention, if the image related to the projection is displayed in the predetermined projection body during the change in the posture of the case, the change in the posture of the case is stopped. Can be automatically stopped.

In the present invention, the projection lens is moved in the horizontal direction and the casing is rotated about the vertical axis, so that the projection direction can be freely adjusted in either the left or right direction.
In the present invention, the projection lens is moved in the vertical direction and the casing is rotated around the horizontal axis, so that the projection direction can be adjusted smoothly in any direction.

  In the present invention, distortion correction of an image related to projection is performed according to the amount of change in the attitude of the housing, so that processing related to distortion correction can be automatically performed with a simple configuration and processing load related to distortion correction is reduced. it can.

  FIG. 1 shows an appearance of a projector 10 corresponding to a projection type image display apparatus according to an embodiment of the present invention. In the projector 10, a projection lens 12 is disposed in a circular opening 11 b formed in a front surface 11 a of a rectangular parallelepiped casing 11, and the projection lens 12 has a lens shift function by a lens shift unit 15 provided in the casing 11. It has. The housing 11 is supported by a disk-shaped base portion 14, and the base portion 14 and the housing 11 are connected by adjusting leg portions 16 that variably adjust the posture of the housing 11. The housing 11 is provided with a remote control light receiving unit 23 at the lower right in the drawing of the front surface 11a, an imaging unit 22 at the upper left, and an operation unit 13 composed of a plurality of operation buttons on the upper surface 11b. ing.

  The projector 10 according to this embodiment can adjust the projection direction in the X direction (lateral direction) and the Z direction (longitudinal direction) within a predetermined range by the operation of the lens shift unit 15 of the projection lens 12, and the operation of the adjustment leg 16. Thus, the projection direction can be changed by rotating the housing 11 around the vertical axis V and the horizontal axis H.

  FIG. 2 shows the structure of the lens shift unit 15. The lens shift unit 15 is a positional relationship in which the first movable plate 17, the second movable plate 18, and the fixed plate 19 fixedly arranged in the housing 11 are overlapped with each other so that the outer cylinder 12 a of the projection lens 12 protrudes. And a second motor 21 that linearly moves the second movable plate 18 along the X direction, and a second motor 21 that linearly moves the first movable plate 17 along the Z direction. Each of the plates 17 to 19 has a hole (not shown) through which light projected from the projection lens 12 passes.

  The first movable plate 17 is attached to the second movable plate 18 so as to be slidable along the Z direction. The first movable plate 17 has a rack gear portion 17b formed on a vertical side portion 17a on the right side in the figure, and a rack gear mounted on a pinion gear 21b attached to a motor shaft 21a of a second motor 21 fixed to the second movable plate 18. The part 17b is meshed. Therefore, when the second motor 21 rotates the motor shaft 21a clockwise or counterclockwise, the first movable plate 17 moves up and down, and the projection lens 12 protruding from the first movable plate 17 accordingly moves up and down. It can move directly in any direction.

  The second movable plate 18 is attached to the fixed plate 19 so as to be slidable along the X direction. The second movable plate 18 has a rack gear portion 18b formed on the lateral side portion 18a on the upper side in the figure, and a pinion gear 20b attached to the motor shaft 20a of the first motor 20 fixed to the fixed plate 19 is formed on the rack gear portion 18b. The second movable plate 18 is moved directly to the left and right by meshing and rotating the motor shaft 20a clockwise or counterclockwise. Further, when the second movable plate 18 moves linearly, the first movable plate 17 and the projection lens 12 attached to the second movable plate 18 also move in the same manner, whereby the projection lens 12 moves linearly in either the left or right direction. Can be moved.

  The first motor 20 and the second motor 21 of the lens shift unit 15 rotate the motor shafts 20a and 20b according to the amount of the pulse signal sent from the motor driver 51 shown in FIG. 5, and when the pulse signal is interrupted. Stop rotation. Although not shown in FIG. 2, the lens shift unit 15 includes a first sensor 55 a and a second sensor 55 b (see FIG. 5) that detect that the first movable plate 17 is positioned at the upper and lower movable limits. A third sensor 55c and a fourth sensor 55d for detecting that the movable plate 18 is positioned at the left and right movable limits are provided. Each of the sensors 55a to 55d is connected to the motor driver 51. When it is detected that the movable plates 17 and 18 are located at the movable limit, a detection signal is sent to the motor driver 51.

  FIG. 3 shows the structure of the adjustment leg 16. The adjusting leg portion 16 has a standing portion 25 having a lower end 25 a fixed at the center of the upper surface of the base portion 14 and a movable portion 27 connected to the upper end 25 b side of the standing portion 25. The standing portion 25 is provided with two hinge portions 25c and 25d at both ends of the upper end 15b, and a central hinge portion 28a protruding from below the movable portion 27 is disposed between the hinge portions 25c and 25d. .

  The central hinge portion 28a has a horizontal (lateral) rotation shaft (not shown) protruding toward the hinge portions 25c and 25d, and the protruding portion of the rotation shaft is connected to each hinge portion 25c and 25d. The upper movable part 27 can be rotated about a horizontal rotation axis (coaxial with the horizontal axis H). The horizontal axis H is in an arrangement relationship orthogonal to the optical axis of the projection lens 12. A third motor 26 fixed in the vicinity of the side of the upper end 25b of the upright portion 25 is disposed at the end on the hinge portion 25c side, and the motor shaft of the third motor 26 and the rotary shaft related to the horizontal axis H are connected. Then, by the rotation of the third motor 26, the movable portion 27 provided with the central hinge portion 28a can be tilted back and forth.

  The movable part 27 that can be tilted back and forth has a structure in which a lower side part 28 and a rotatable upper part 29 are connected to each other, and the lower side part 28 projects a motor shaft 30a upward. The motor shaft 30a is fitted in the center of the lower surface 29a of the upper portion 29, and the upper portion 29 rotates about the vertical axis V (coaxial with the motor shaft 30a) by the rotation of the motor shaft 30a. The vertical axis V is orthogonal to the horizontal axis H, and similarly tilts when the movable portion 27 tilts due to the rotation of the third motor 26.

  The upper surface 29b of the upper portion 29 constituting the movable portion 27 is attached to the lower surface of the casing 11 shown in FIG. 11, and the movable portion 27 of the adjusting leg portion 16 is rotated around the horizontal axis H as described above. In such a case, the posture of the housing 11 can be changed so as to adjust the elevation angle in the projection direction, and when the upper portion 29 of the adjustment leg 16 rotates about the vertical axis V, the left and right angles in the projection direction are adjusted. The attitude of the housing 11 can be changed. In addition, when the movable part 27 and the upper part 29 are rotated simultaneously, the housing | casing 11 changes an attitude | position so that both an elevation angle and a left-right angle may be adjusted simultaneously.

  The third motor 26 and the fourth motor 30 of the adjusting leg 16 are also driven in accordance with the amount of pulse signal, similarly to the first and second motors 20 and 21 described above. Although not shown in FIG. 3, the adjusting leg portion 16 is rotated by fifth and sixth sensors 55 e and 55 f that detect the front and rear tilt ends of the movable portion 27 tilted by the third motor 26 and the fourth motor 30. The seventh and eighth sensors 55g and 55h for detecting the left and right pivot ends of the upper portion 29 are provided, and the sensors 55e to 55h are connected to the motor driver 51 (see FIG. 5).

  FIG. 4 shows a configuration of an optical system provided in the projector 10. The optical system of the projector 10 includes a light source 40, a color wheel 41, a rod integrator 42, a total of three sets of condenser lenses 43 to 45, a reflection mirror 46, a display device 47, and the projection lens 12. A light beam emitted from the light source 40 passes through a predetermined region of the color wheel 41 having the RGB region, passes through the rod integrator 42 and the condenser lenses 43 to 45, is reflected by the reflection mirror 46, and travels toward the display device 47.

  The display device 47 corresponds to a light modulation element that generates modulated light representing an image displayed on a screen (projected body). In the present embodiment, a DMD (Digital Micromirror Device: registered trademark; hereinafter the same) is used. . In the display device 47, each element (mirror element) is driven so as to generate modulated light representing an image in accordance with image data input to the projector 10. In addition to the DMD, a display panel such as a liquid crystal panel can also be used as the display device 47. In this case, it is necessary to configure an optical system corresponding to the display panel.

  The projection lens 12 for projecting the modulated light generated by the display device 47 has a structure (not shown) related to a zoom function for enlarging / reducing an image size displayed on the screen, and an image displayed on the screen. The zoom function and the focus adjustment function can be operated manually or automatically by the user. The projector 10 includes a drive motor (not shown) for operating each function with respect to each of the zoom function and the focus adjustment function.

  FIG. 5 is a block diagram showing a main control system of the projector 10 related to the present invention. A control system of the projector 10 includes a control processing unit 50 that performs various controls, a motor driver 51, a display driving unit 52, an input unit 53, an image processing unit 54, an operation unit 13, and a remote control light receiving unit via an internal connection line 51. 23 is connected so that various signals can be transmitted and received between the units 50 and 51. Although not shown in FIG. 5, the projector 10 also includes a ballast circuit unit that emits light from the light source 40 and a power supply unit that supplies power to each unit. Hereinafter, each part of the control system will be described.

  The motor driver 51 controls the motors 20, 21, 26, and 30, and drives the motors 20, 21, 26, and 30 in response to an instruction signal for instructing motor driving from the control processing unit 50. A process of generating a pulse signal and outputting the generated pulse signal to predetermined motors 20, 21, 26, 30 is performed. For example, when the motor driver 51 receives an instruction signal for driving the first motor 20, it generates a pulse signal and sends it to the first motor 20. The motor driver 51 generates a number of pulse signals corresponding to the number of received instruction signals. Since the motor driver 51 sends a pulse signal while receiving the instruction signal, the motors 20, 21, 26, 30 rotate the motor shafts 20a, 21a, etc. in proportion to the number of pulse signals sent.

  On the other hand, each of the sensors 55 a to 55 h connected to the motor driver 51 transmits a detection signal to the motor driver 51 when a detection target is detected. When receiving the detection signal, the motor driver 51 stops outputting the pulse signal and outputs a notification signal for notifying the control processing unit 50 that the detection signal has been received.

  The display driving unit 52 includes a formatter circuit that performs control processing for driving each element of the display device 47 so as to generate modulated light, and performs drive control processing in accordance with an image generation instruction signal from the control processing unit 50. Is going. The input unit 53 corresponds to a connection unit with an external device, receives display image data from the external device, and transmits the image data to the control processing unit 50.

  The image processing unit 54 performs predetermined conversion processing and image processing on the image captured by the imaging unit 22, and sends data of the captured image that has been processed to the control processing unit 50. The operation unit 13 receives an operation instruction from the user, and a predetermined operation signal is assigned to each button constituting the operation unit 13, and the assigned operation signal is being pressed. Is sent to the control processing unit 50.

  The remote control light receiving unit 23 receives the operation signal sent as infrared light from the remote controller 60 and sends the received operation signal to the control processing unit 50. In particular, in this embodiment, the user in the projection direction Functions as a means for receiving a change instruction and a change stop instruction. The remote controller 60 has a plurality of push-type keys and buttons. In particular, in this embodiment, the remote controller 60 has up / down / left / right keys 60a to 60d for adjusting the projection direction by a user's manual operation, and automatically projects. An automatic adjustment key 60e is provided to give an instruction to adjust the direction. Similarly to the buttons of the operation unit 13 described above, each key 60a to 60e is assigned a predetermined operation signal, and the assigned operation signal is issued from the remote controller 60 while being pressed. .

  Therefore, when adjusting the projection direction, when the user presses each of the keys 60a to 60e, the remote control light receiving unit 23 receives an operation signal for adjusting the projection direction as an instruction to change the projection direction, and the user presses the keys 60a to 60e. Since the operation signal issued from the remote controller 60 is interrupted, the remote control light receiving unit 23 receives an instruction to stop changing the projection direction. When the user presses the automatic adjustment key 60e, the remote control light receiving unit 23 receives an operation signal for automatic adjustment of the projection direction as an instruction to automatically change the projection direction.

  Finally, the control processing unit 50 performs processing for displaying an image corresponding to the image data from the external device received by the input unit 53, rotation control of the color wheel 41, and other general control processing. In the embodiment, a control process related to the change of the projection direction, a distortion correction process corresponding to the change of the projection direction, and the like are performed. Note that the control processing unit 50 has a memory 50a therein, a program that defines the processing contents of the control processing unit 50, image data for displaying various test images, menu images, and the like, and distortion correction. A correction table T for processing is stored in advance.

  The outline of the process performed by the control processing unit 50 for the change of the projection direction is as follows. The control processing unit 50 starts the projection direction changing process based on the operation signal sent from the remote control light receiving unit 23, first operates the lens shift function for moving the projection lens 12, and moves the projection lens 12 to the movable limit. However, if it is necessary to further change the projection direction, control for changing the posture of the housing 11 is performed next. Therefore, when starting the change process of the projection direction, the control processing unit 50 first turns either or both of the first motor 20 and the second motor 21 of the lens shift unit 15 in accordance with an operation signal from the remote control light receiving unit 23. A process of outputting an instruction signal to be driven to the motor driver 51 is performed.

  In addition, the control processing unit 50 performs a control process of stopping the output of the instruction signal by the user's operation or the determination of the captured image of the imaging unit 22 during the output of the instruction signal related to driving of the motors 20 and 21. Furthermore, the control processing unit 50 also receives the notification signal for notifying the detection of each of the sensors 55a to 55d from the motor driver 51 during the output of the instruction signal related to the driving of the motors 20 and 21. A control process for stopping the output of the instruction signal related to driving is performed.

  Furthermore, when the control processing unit 50 stops outputting the instruction signal in response to the detection notification of each of the sensors 55a to 55d, it is necessary to further adjust the projection direction based on the user's operation or the captured image of the imaging unit 22. If it is determined, a process of outputting an instruction signal for driving either or both of the third motor 26 and the fourth motor 30 of the adjusting leg 16 to the motor driver 51 is performed. The output of the instruction signal related to the driving of the motors 26 and 30 is received when the control processing unit 50 determines to end the adjustment of the projection direction or the notification signal for notifying the detection of each of the sensors 55e to 55f from the motor driver 51. Continue until time.

  A specific example in the case where the above-described change in projection direction is performed based on a user's manual operation will be described below. The control processing unit 50 performs a projection direction control process based on an operation signal received via the remote control light receiving unit 23. For example, the user presses the right key 60d of the remote controller 60 to change the projection direction to the right direction. Then, the control processing unit 50 generates an instruction signal for driving the first motor 20 so that the projection lens 12 moves in the right direction according to the operation signal received via the remote control light receiving unit 23. An instruction signal is output to the motor driver 51.

  While the control processing unit 50 continues to receive the operation signal, the control processing unit 50 continues to generate the instruction signal for driving the first motor 20, but the user releases the press of the right key 60d to change the projection direction to the right direction. When the instruction to stop the change is made, the operation signal is interrupted, and the output of the instruction signal for driving the first motor 20 is stopped according to the interruption of the operation signal. When the notification signal indicating that the projection lens 12 is positioned at the right movable limit is received from the motor driver 51 while the operation signal is continuously received, the generation of the instruction signal for driving the first motor 20 is stopped. On the other hand, an instruction signal for driving the fourth motor 30 so that the housing 11 faces right is generated and output to the motor driver 51.

  The control processing unit 50 continues to generate an instruction signal for driving the fourth motor 30 while the operation signal is continuously received. However, when the user releases the right key 60d, the operation signal is interrupted. Therefore, the output of the instruction signal for driving the fourth motor 30 is stopped. In addition, when receiving a notification signal from the motor driver 51 that the housing 11 has reached the right rotation limit while continuously receiving the operation signal, generation of an instruction signal for driving the fourth motor 30 is generated. Process to stop. In addition, although the content with respect to the change of the projection direction mentioned above was demonstrated by the case where the right key 60d is operated by the user, also when other keys 60a-60c are operated, control is performed only by changing the motor to be controlled. The processing unit 50 performs the same processing as described above.

  On the other hand, the specific processing content of the control processing unit 50 when the above-described change in the projection direction is automatically performed will be described below. When the user presses the automatic adjustment key 60e of the remote controller 60, the control processing unit 50 receives an operation signal corresponding to the automatic adjustment key 60 and enters the automatic adjustment mode. When the automatic adjustment mode is entered, the control processing unit 50 controls the display driving unit 52 and the like to project the modulated light representing the test image G so as to display the test image G as shown in FIG. Project from the lens 12. After projecting the modulated light, the control processing unit 50 controls the imaging unit 22 to capture the projection direction, acquires the captured image of the imaging unit 22 via the image processing unit 54, and determines the projection direction according to the content of the captured image. The process for identifying the direction to change the is performed.

  The control processing unit 50 performs specific processing for changing the orientation according to the positional relationship between the test image G and the screen S indicated by the captured image. Specifically, the control processing unit 50 positions the four corners of the test image G and the four corners of the screen S. The relationship is detected, and the direction to be changed is specified based on the detection result.

  For example, when the positional relationship between the two in the captured image is the state shown in FIG. 6A, the control processing unit 50 includes the four corners G1 to G4 of the test image G and the four corners of the screen S (projected body). The positional relationship between the corners S1 to S4 is detected. In the state of FIG. 6A, since the test image G does not overlap the screen S at all, the corners (G2, G3) close to the screen S among the corners G1 to G4 of the test image G are shown. The direction approaching the screen S is specified as the direction in which the projection direction is changed (the arrow direction in the figure, the right direction). In the state shown in FIG. 6B, the test image G partially overlaps the screen S when the positional relationship between the captured images is in the state shown in FIG. 6B, so that the non-overlapping corners (G1, G4) are on the screen S. The approaching direction is specified as the direction in which the projection direction is changed (the arrow direction in the figure, the right direction).

  Next, the control processing unit 50 sends an instruction signal for driving either or both of the first motor 20 and the second motor 21 of the lens shift unit 15 so that the projection lens 12 moves in the specified change direction. The process which outputs to 51 is performed. Further, the control processing unit 50 determines the positional relationship between the test image G and the screen S based on the captured image even during the output of the instruction signal related to the driving of the motors 20 and 21, and the captured image is shown in FIG. When it is determined that the test image G is within the screen S as shown in FIG.

  Further, when a notification signal for notifying that each of the sensors 55 a to 55 d has detected is received from the motor driver 51 during the output of the instruction signal related to driving of the motor 20 and the motor 21, the control processing unit 50 performs the motor 20. After performing the control process for stopping the output of the instruction signal related to the driving of the motor 21, an instruction signal for driving one or both of the third motor 26 and the fourth motor 30 of the adjusting leg 16 is sent to the motor driver 51. Process to output to.

  Furthermore, the control processing unit 50 determines the positional relationship between the test image G and the screen S based on the captured image in the same manner as described above during the output of the instruction signal related to the driving of the motors 26 and 30, and the captured image When it is determined that the test image G is within the screen S as shown in FIG. 6C, the output of the instruction signal is stopped. The control processing unit 50 also performs a process of stopping the output of the instruction signal even when receiving a notification signal from the motor driver 51 notifying that each of the sensors 55e to 55f has detected.

  Further, when the instruction signal related to driving of the motors 26 and 30 is output, the control processing unit 50 counts the number of instruction signals output, and the distortion correction amount corresponding to the counted number is stored in the built-in memory 50a. The identification process is performed based on the correction table T. The correction table T has a content that defines a distortion correction amount for each type of instruction signal for driving the motors 20, 21, 26, and 30.

  The distortion correction amount defined by the correction table T employs a value based on the result of a previous projection experiment, and examines how much trapezoidal distortion occurs in the image displayed according to the change in the attitude of the housing 11. Then, a distortion correction amount for correcting the trapezoidal distortion is calculated, and the distortion correction amount calculated for each number of instruction signals is associated with the correction table T. Therefore, since the control processing unit 50 specifies the distortion correction amount based on the correction table T, the processing load is small, the distortion correction amount is specified in a very short time, and the display device 47 modulates the modulated light based on the specified distortion correction amount. The display driving unit 52 is controlled so as to generate.

  Further, the control processing unit 50 also performs a process of adjusting the zoom based on the captured image with respect to the test image G displayed on the screen S, and projects so that the test image G in the screen S is displayed to the maximum extent. The zoom adjustment of the lens 12 is automatically controlled. The control processing unit 50 also automatically controls the focus adjustment of the projection lens 12 based on the captured image. The zoom adjustment and the focus adjustment can be performed manually by the user by performing a predetermined operation with the operation unit 13 or the remote controller 60.

The first flowchart shown in FIG. 7 is an arrangement of the projection direction changing process according to the manual operation of the projector 10 based on the control processing unit 50 described above, and an image related to the projection change adjustment of the projector 10 according to the first flowchart. The processing procedure of the display method will be described below.
First, the projector 10 (control processing unit 50) determines whether or not a projection direction change operation has been performed by the user pressing one of the up / down / left / right keys 60a to 60d of the remote controller 60 (S1). If there is no change operation (S1: NO), the change operation is waited. If there is a change operation (S1: YES), the lens shift function is activated in the direction corresponding to the change operation to move the projection lens 12 (S2). ).

  Next, the projector 10 determines whether or not the moved projection lens 12 has moved to the movable end (S3). When the projection lens 12 has not moved to the movable end (S3: NO), the projector 10 has been operated. It is determined whether the up / down / left / right keys 60a to 60d are not pressed and the change operation is turned off (S4). When the change operation is not turned off (S4: NO), the process returns to the step (S2) of moving the projection lens 12, and the movement of the projection lens 12 is continued. When the change operation is turned off (S4: YES), the projector 10 stops the movement of the projection lens 12 (S5) and ends the projection direction change process. Note that when adjustment of the projection direction is completed only by moving the projection lens 12, trapezoidal distortion does not normally occur in the image displayed on the screen S, so that distortion correction processing is not automatically performed.

  On the other hand, when the projection lens 12 has moved to the movable end in the determination regarding the movement of the projection lens 12 (S3: YES), the projector 10 stops the movement of the projection lens 12 and moves in the direction according to the change operation. The housing 11 is rotated to change the posture of the housing 11 (S6). Then, the projector 10 determines whether or not the up / down / left / right keys 60a to 60d that have been operated are not pressed and the change operation is turned off (S7).

  When the change operation is not turned off (S7: NO), the process returns to the step of changing the posture of the casing 11 (S6), and the rotation of the casing 11 is continued. When the change operation is turned off (S7: YES), the projector 10 stops the posture change of the housing 11 (S8), and according to the amount of rotation of the housing 11 for the posture change. The projector 10 automatically performs the distortion correction process (S9), and the projection direction change process ends. It should be noted that after the projection direction changing process is completed, if necessary, zoom and focus adjustment are performed by a user's manual operation.

  As described above, when adjusting the projection direction of the projector 10 according to the present invention by manual operation, since the movement of the projection lens 12 and the rotation (posture change) of the housing 11 are performed in cooperation, the user can It is not necessary to be aware of the movement operation with respect to 12 and the rotation operation with respect to the housing 11, and it is only necessary to perform an operation instructing to change the projection direction. As a result, the projection direction is changed to the instructed direction only while the keys 60a to 60d are being pressed, and if the operation is stopped by releasing the press, the change of the projection direction is also stopped. The projection direction can be freely adjusted to the desired direction. In addition, after the casing 11 is rotated and the projection direction is adjusted, a process for correcting the trapezoidal distortion is performed without performing a special operation, so that the operation burden on the user can be reduced.

Further, the second flowchart shown in FIG. 8 is an arrangement of the automatic change process of the projection direction of the projector 10 based on the control processing unit 50 described above. Hereinafter, the image related to the automatic projection change of the projector 10 according to the second flowchart. A processing procedure of the display method will be described.
First, the projector 10 (control processing unit 50) determines whether or not the automatic adjustment mode is turned on when the user presses the automatic adjustment key 60e of the remote controller 60 (S10). When the automatic adjustment key 60e is not operated and the automatic adjustment mode is not set (S10: NO), the operation of the automatic adjustment key 60e is awaited. When the automatic adjustment mode is set (S10: YES), the projector 10 projects the modulated light representing the test image and performs imaging in the projection direction (S11).

  Next, the projector 10 specifies the direction in which the projection is adjusted based on the captured image (S12), and moves the projection lens 12 in the specified direction (S13). Then, the projector 10 determines whether or not the moved projection lens 12 has moved to the movable end (S14). If the projection lens 12 has not moved to the movable end (S14: NO), the projector 10 projects based on the captured image. It is determined whether or not the display image by is within the screen (S15). If the display image does not fit within the screen (S15: NO), the process returns to the stage of moving the projection lens 12 (S13), and the movement of the projection lens 12 is continued. If the display image fits within the screen (S15: YES), the projector 10 stops the movement of the projection lens 12 (S16) and ends the projection direction changing process.

  On the other hand, when the projection lens 12 has moved to the movable end in the determination regarding the movement of the projection lens 12 (S14: YES), the projector 10 stops the movement of the projection lens 12 and moves in the specified direction to the housing 11. Is rotated to change the attitude of the casing 11 (S17), and it is determined whether the casing 11 has been rotated to the rotating end or whether the display image obtained by the projection is within the screen based on the captured image. (S18). When the casing 11 does not rotate to the rotation end and the display image does not fit in the screen (S18: NO), the process returns to the stage of changing the attitude of the casing 11 (S17). Keep moving. Further, when at least one of the rotation to the rotation end of the casing 11 and the display image being within the screen corresponds (S18: YES), the projector 10 stops the attitude change of the casing 11 ( S19), distortion correction processing (S20) is performed according to the amount by which the housing 11 is rotated for posture change, and further, dimension adjustment (zoom processing) of the display image is performed based on the captured image (S21).

  After the dimension adjustment, the projector 10 determines whether or not the size of the display image matches the screen S based on the captured image (S22). If the display image does not match the screen S (S22: NO) Returning to the dimension adjustment stage (S21), the dimension adjustment process is continued. If the display image matches the screen S (S22: YES), the projection method adjustment process is terminated. As described above, when the projection direction of the projector 10 according to the present invention is automatically adjusted, the user can adjust the projection direction to an optimum state only by pressing the automatic adjustment key 60e.

  Further, in the projector 10 according to the present invention, even when the projection direction is adjusted by any of the above-described manual operation and automatic adjustment, the image quality of the display image is deteriorated due to the adjustment of the projection direction accompanying the rotation of the housing 11. It is demonstrated below according to the content shown to FIGS. 9 to 11, the positional relationship between the center of the housing 11 and the screen S in the plan view of the projector 10 is the same as the case center in the plan view of the conventional projector 1 shown in FIGS. The positional relationship with the screen S is the same.

  First, as shown in FIG. 9A, when the projector 10 performs projection without adjusting the projection direction, a part of the screen S and the display image 70 resulting from the projection overlap. When the projection direction is adjusted from this state, as shown in FIG. 9B, the projector 10 operates the lens shift function of the projection lens 12 to move the optical axis K to the screen S side (arrow direction in the figure). Let

  Even if the projection lens 12 is moved to the right movable end, the display image 70 does not fit in the screen S. Therefore, the projector 10 next rotates the casing 11 about the vertical axis V so as to face the screen S. The attitude of the housing 11 is changed (see FIG. 10A). The image displayed by the rotation of the housing 11 becomes a display image 71 with trapezoidal distortion, but the display image 71 fits within the screen S. At this time, the angle B between the optical axis K and the perpendicular C to the display surface of the screen S is smaller than the conventional angle A shown in FIG. This is because, in the projector 10 of the present invention, the casing 11 is rotated after the projection lens 12 is first moved to the screen S side as much as possible, whereby the display image 71 in FIG. Compared to the image 4 in FIG. 14A, the amount of distortion of the trapezoidal distortion is small.

  Furthermore, when the display image 71 fits within the screen S and the adjustment of the projection direction is completed, the projector 10 of the present invention automatically performs trapezoidal distortion correction as shown in FIG. The image 72 is displayed on the screen S. The image 72 has a larger outer dimension than the image 4 ′ in FIG. 14B because the distortion amount of the display image 71 before correction is small.

  Finally, as shown in FIG. 11, the projector 10 zooms in accordance with the screen S, but since the image 72 before zooming is larger than the conventional image 4 ′, the enlargement rate can be reduced as compared with the conventional one. Therefore, the size of the grid indicating the image quality of the enlarged image 73 is finer than that of the image 4 ″ displayed by the conventional projector 1 shown in FIG. 14C, and deterioration of the image quality is suppressed.

  The projector 10 according to the present invention is not limited to the above-described form, and various modifications can be applied. For example, the trapezoidal distortion correction process is automatically performed after the adjustment of the projection direction is completed, but when the casing 11 is rotated and the projection direction is adjusted, the trapezoidal distortion correction is performed simultaneously. Correction processing may be performed. In this case, each time the control processing unit 50 generates an instruction signal for rotating the housing 11, the distortion correction amount is specified based on the correction table T, and display driving is performed. Control for the unit 52 is performed. By simultaneously performing the distortion correction processing in this way, the image displayed on the screen S is always an image without distortion, and the user always shows a rectangular display image without distortion, and is based on the distortion. The discomfort can be eliminated.

  In addition to using the correction table T for the distortion correction process, a relational expression representing the relationship between the number of instruction signals of the control processing unit 50 that causes the casing 11 to rotate and the distortion correction amount is created. It is also possible to specify the distortion correction amount from the number of instruction signals using a relational expression. In this case, since the correction table T is not necessary, the storage area of the built-in memory 50a can be released.

  Further, the projection direction adjustment process shown in FIG. 8 may be started based on an ON operation of the power button of the projector 10, and in this case, the projector 10 receives an instruction to change the projection direction by the ON operation of the power button. become. Furthermore, when simplifying the specification, the projector 10 can omit the automatic projection direction adjustment processing function shown in FIG. 8, and further omits the function of automatically performing distortion correction processing. In this case, the imaging unit 22 and the image processing unit 54 illustrated in FIG. 5 are not necessary, which can contribute to simplification of the internal configuration. In addition, the projector 10 does not need to have both horizontal and vertical adjustment functions, and may have a specification having only one of the adjustment functions to simplify the apparatus configuration.

1 is a perspective view showing an external appearance of a projector according to an embodiment of the invention. It is a schematic perspective view which shows the lens shift part of a projection lens. It is a schematic perspective view which shows an adjustment leg part. It is the schematic which shows the optical system of a projector. It is a block diagram which shows the control system of a projector. (A) is a schematic diagram showing a case where the image is separated from the screen, (b) is a schematic diagram showing a case where the image partially overlaps the screen, and (c) is a schematic diagram showing a case where the image is within the screen. FIG. It is a 1st flowchart which shows the process sequence of the image display method which concerns on adjustment of the projection direction by manual operation. It is a 2nd flowchart which shows the process sequence of the image display method which concerns on adjustment of the projection direction by automatic adjustment mode. (A) is the schematic which shows the case where the image displayed with the projector partially overlaps with a screen, (b) is the schematic which shows the case where the projection direction is moved by the movement of a projection lens. (A) is the schematic which shows the state which rotated the housing | casing and stored the image in the screen, (b) is the schematic which shows the state which performed the distortion correction process. It is the schematic which shows the state which expanded the image according to the screen. It is the schematic which shows the state which has arrange | positioned the projector with the projection lens facing the screen. (A) is the schematic which shows the case where the image displayed with the projector partially overlaps with the screen, (b) is the schematic which shows the state which stored the image in the screen by the movement of a projection lens. (A) is a schematic diagram showing a case where a projector is installed obliquely with respect to the screen, (b) is a schematic diagram showing a state where distortion correction processing is performed, and (c) is a state where an image is enlarged in accordance with the screen. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Projector 11 Housing | casing 12 Projection lens 15 Lens shift part 16 Adjustment leg part 22 Imaging part 23 Remote control light-receiving part 47 Display device 50 Control processing part 60 Remote controller

Claims (10)

A light modulation element housed in the housing, a projection lens that projects modulated light representing an image generated by the light modulation element, and a lens moving unit that moves the projection lens to change the projection direction. A projection-type image display device that displays an image on a projection object by projecting modulated light from the projection lens;
A housing posture changing means for changing the posture of the housing so as to change the projection direction;
Accepting means for accepting an instruction to change the projection direction;
When the accepting means accepts the change instruction, the lens moving means moves the projection lens in the projection direction according to the change instruction,
When the projection lens is moved to a movable limit, the casing posture changing unit changes the posture of the casing in a projection direction according to the change instruction. The accepting means accepts a change stop instruction,
2. The projection type image display device according to claim 1, wherein when the accepting unit accepts a change stop instruction during the movement of the projection lens, the lens moving unit stops the movement of the projection lens.   The projection type image display according to claim 2, wherein when the accepting unit accepts a change stop instruction during the change of the posture of the housing, the housing posture changing unit stops the posture change of the housing. apparatus. Imaging means for imaging the projection direction;
A determination unit that determines whether an image related to the projection is displayed in the projection target based on a captured image captured by the imaging unit when the reception unit receives a change instruction;
The lens moving unit stops the movement of the projection lens when the projection unit determines that an image related to the projection is displayed in the projection target during the movement of the projection lens. The projection type image display apparatus according to claim 1.   When the determination unit determines that an image related to the projection is displayed in the projection body during the change in the posture of the casing, the case posture change unit stops the change in the posture of the casing. The projection type image display apparatus according to claim 4. The lens moving means is configured to move the projection lens in a lateral direction,
The projection type image display device according to any one of claims 1 to 5, wherein the casing posture changing means rotates the casing about a vertical axis. The lens moving means is configured to move the projection lens in a vertical direction,
The projection type image display device according to any one of claims 1 to 6, wherein the casing posture changing means rotates the casing about a horizontal axis.   The projection type image display apparatus according to claim 1, further comprising a distortion correction unit that performs distortion correction of an image related to the projection according to an amount of change in the posture of the housing by the housing posture changing unit. . The projection lens can be moved and the orientation of the housing can be changed so as to change the projection direction, and the modulated light representing the image generated by the light modulation element in the housing is projected from the projection lens to display the image on the projection target. An image display method of a projection type image display device to display,
The projection-type image display device
A step of moving the projection lens in a projection direction according to the change instruction when receiving an instruction to change the projection direction;
And a step of changing the posture of the housing in a projection direction according to the change instruction when the projection lens moves to a movable limit.   The image display method according to claim 9, wherein the projection-type image display device includes a step of correcting distortion of an image related to projection according to an amount of change in posture of the housing when the posture of the housing is changed.

Images