JP2009251204A - Wide angle projection type video display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wide angle projection type video display device that can be easily and exactly installed when it is to be set and installed and can automatically correct trapezoidal distortion. <P>SOLUTION: The projection type video display device includes: a body case 1a; a projection lens 3 using a short focus lens; an aspherical reflection mirror 4 reflecting projection light R from the projection lens 3 toward a projection surface; a plurality of bar-like protrusions 5 protruding toward a wall surface Z from the body case 1a; a protrusion driving part that makes the protrusions 5 advance and retreat; and an operation part that performs running operation of the device. The plurality of protrusions 5 comprise at least three protrusions so as to form a fixed plane by all their edge surfaces, and are constituted to protrude by an initial set dimension L set in the operation part when the device is set and installed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is a wide-angle projection type equipped with a short-focus projection lens for projecting a video created by a computer or the like and video signal data recorded on a recording medium such as an optical disk or a magnetic tape onto a projection surface such as a screen as projection light. The present invention relates to a video display device.

  Projection-type video display devices are used as video display devices in various facilities such as home theaters, conference rooms, training rooms, classrooms, amusement halls, various exhibition rooms, and studios. Unlike a television, the projection display apparatus is a portable display apparatus in which the installation position of the projection display apparatus body and the projection surface are not integrated. For this reason, the projection display apparatus has a problem that trapezoidal distortion (or keystone distortion) occurs when the wall surface forming the projection surface and the projection optical axis are not perpendicular to each other. In addition, correction of the trapezoidal distortion is performed by adjusting the installation posture of the projection display apparatus while viewing the projection screen in the conventional normal projection display apparatus.

Furthermore, many conventional projection image display devices require a projection distance of several meters between the projection image display device and a projection surface such as a screen or a wall, and obstruct light in the meantime. Since it cannot be placed, there is a problem that the usage environment is restricted. Therefore, in order to eliminate such inconvenience, in recent years, a wide-angle projection-type video display device has been developed that has flexibility and improved installation by shortening the projection distance between the projection-type video display device and the projection surface. Has been. Such a wide-angle projection display apparatus uses a short focus lens as a projection lens as described in Patent Document 1 and the like, and reflects the projection light from the projection lens by an aspherical reflection mirror. And is projected onto a projection surface such as a wall surface, and can be projected onto the wall surface at a wide angle only by placing a slight distance between the projection surface and the apparatus.
JP 2004-252049 A JP 2000-241874 A Japanese Patent Laid-Open No. 2006-189585

  However, in such a wide-angle projection display apparatus, if there is a slight deviation in the perpendicularity between the projection optical axis and the projection surface, a large trapezoidal distortion occurs or the projection screen deviates from the planned location. There was a problem.

  Here, the generation of distortion in the case where a wide-angle liquid crystal projector as a wide-angle projection-type image display device is installed on a horizontal surface such as a floor surface and projection light is projected onto a wall surface will be specifically described. FIG. 7 shows an installation example in which a wide-angle liquid crystal projector 101 as a wide-angle projection display apparatus is installed on a mounting table 102 and projected onto a wall surface 103 at a position slightly away from the mounting table 102. In this case, the liquid crystal projector 101 reflects the projection light R from the short focus projection lens by the aspheric reflection mirror 104 and projects it onto the wall surface 103. In this example, the wall surface 103, the floor surface 105, and the mounting surface 102 a of the mounting table 102 on which the liquid crystal projector 101 is installed are not inclined, and the liquid crystal projector 101 also has a projection optical axis perpendicular to the wall surface 103. This is the case of an ideal installation state where the system is installed. Therefore, the projection screen 106 is projected at a predetermined position and size, and so-called trapezoidal distortion does not occur.

  FIG. 8 shows an installation example in the case where the angle α1 is inclined so that the mounting surface 102a of the mounting table 102 becomes higher toward the wall surface 103 with respect to such an ideal installation state. In this case, since the projection screen 106 is projected at a wide angle, a large trapezoidal distortion spreading upward due to a slight inclination of the mounting surface 102a of the mounting table 102 occurs. In this figure, the solid line indicates the projection screen 106, and the broken line indicates the projection setting surface 106A. This also applies to FIGS. 9 and 10 described below.

  FIG. 9 shows an installation example when the mounting surface 102 a of the mounting table 102 is inclined at an angle α2 so as to become lower toward the wall surface 103, contrary to FIG. 8. In this case, a large trapezoidal distortion is generated in which the upper end portion of the projection screen 106 shrinks downward. FIG. 10 shows an installation example in the case where the liquid crystal projector 101 is placed with an angle α3 inclined so that the left direction in plan view is separated from the wall surface 103, and the projection screen 106 has an upper left side and an upper left side. A large trapezoidal distortion spreads out.

  FIG. 11 shows an installation example in the case where the wall surface 103 is inclined unlike the above case. That is, FIG. 11A shows a case in which the wall surface 103 is inclined upward by an angle α1 as the wall surface 103 is directed upward as viewed from the liquid crystal projector 101. In this case, the trapezoidal distortion similar to that shown in FIG. FIG. 5B shows the opposite case, in which the wall surface 103 is inclined upward by an angle α2 as the wall surface 103 faces upward as viewed from the liquid crystal projector 101. In this case, a trapezoidal distortion similar to that shown in FIG. In these drawings, a two-dot chain line indicates a position 103A when the wall surface 103 is vertical.

  With respect to such a trapezoidal distortion problem, there is a conventional technique that corrects a trapezoidal distortion in terms of software, including the amount caused by the installation posture of the projection display apparatus. As such a thing, there exists patent document 2, for example. However, when the trapezoidal distortion is corrected by software including the trapezoidal distortion due to the installation posture of such a projection display apparatus, there is a problem that image quality deterioration is conspicuous. Therefore, in the case where a large distortion occurs due to a slight deviation in the perpendicularity between the projection optical axis and the projection surface as in the above wide-angle projection display apparatus, it is necessary to minimize the trapezoidal distortion caused by the installation posture. there were. Under such a way of thinking, there is Patent Document 3 that considers securing the perpendicularity between the projection optical axis of the projection display apparatus and the projection plane at the time of installation. However, this is not related to a wide-angle projection display, but a conventional projection display is placed on a pedestal and adjusted to maintain verticality. It was time consuming.

  The present invention has been made under such a background, and maintains verticality between the projection optical axis and the wall surface forming the projection surface at the time of deferred installation as accurately as possible, and automatically trapezoidal distortion. An object of the present invention is to provide a wide-angle projection image display device that can be corrected.

  The wide-angle projection display apparatus according to the present invention includes a main body case, a projection lens using a short focus lens, an aspheric reflection mirror that reflects projection light from the projection lens toward the projection surface, and a stationary installation. In addition, a plurality of rod-shaped protrusions housed in the main body case so as to protrude from the main body case toward the wall surface, a protrusion driving unit for moving the protrusions back and forth, and an operation for operating the apparatus The plurality of protrusions are composed of at least three so as to form a fixed plane by all the tip surfaces, and in the case of stationary installation, the initial set dimensions set in the operation unit are set. It is comprised so that it can protrude.

  Here, deferred installation refers to a projection in which a wide-angle projection display apparatus is installed on a horizontal surface such as a floor surface or a mounting surface of a mounting table in front of a wall surface constituting a projection surface and reflected by an aspherical reflecting mirror. An installation mode in which light is projected toward a wall surface.

  When configured in this way, the projection unit is operated by operating the operation unit at the time of installation so that the projecting object protrudes to an initial set dimension, and the projection surface is installed so that the tip of the projecting object abuts the wall surface constituting the projection surface. It can be installed with the perpendicularity between the wall surface to be formed and the projection optical axis as high as possible. Therefore, when there is no inclination or distortion on the installation surface and wall surface of the wide-angle projection display apparatus, the perpendicularity between the wall surface and the projection optical axis is ensured, and the occurrence of trapezoidal distortion is substantially prevented. Also, when the installation surface of the wide-angle projection display is inclined upward or downward toward the wall, or when viewed from the wide-angle projection display, the upper side of the wall is inclined forward or backward. In such a case, it is possible to minimize software trapezoidal distortion correction and to minimize degradation of image quality due to software trapezoidal distortion correction. In addition, when the wall surface is inclined in the left-right direction, occurrence of trapezoidal distortion is prevented by arranging the protrusions so that the tips of the protrusions are in contact with the inclination. Therefore, compared with the conventional one described in Patent Document 3 or the like, the installation effort is greatly reduced.

  In addition, the initial set dimension of the protrusion can be configured to be variably set by an operation in the operation unit. With this configuration, the projection distance can be changed and the size of the projection screen can be changed by changing the initial dimension, so that the handling is simplified.

  In addition, when the protrusions are installed so that the tip surfaces of as many protrusions as possible come into contact with the wall surfaces, by selecting the distortion correction operation with the operation unit, the tips of all the protrusions are brought into contact with the wall surfaces. The extension length of each protrusion is measured by the extension measurement unit, and the image is based on the measured extension length of each protrusion and the initial set dimension. It is preferable that the trapezoidal distortion correction of the signal data is automatically performed. With this configuration, if the installation surface of the wide-angle projection display is inclined upward or downward toward the wall, or the upper side of the wall as viewed from the wide-angle projection display is forward. Or when it inclines backward, those inclinations can be calculated from the extension length of a protrusion, and trapezoid distortion amount can be calculated. Therefore, the trapezoidal distortion correction of the video signal data is performed based on this result. Further, in this case, since the vertical angle between the projection optical axis and the wall surface of the wide-angle projection display apparatus is set as high as possible, software trapezoidal distortion correction is minimized. Therefore, image quality deterioration due to software-like trapezoidal distortion correction is minimized.

  In addition, when an initial setting dimension of the projecting object is set, a projection distance from the projecting dimension based on the initial setting dimension to the center of the projection screen is calculated, and the lens focus adjustment is automatically performed. Also good. If comprised in this way, a focus will be set in the step which set the initial setting dimension for installation of a wide angle projection type video display apparatus. Therefore, when the installation surface and wall surface of the wide-angle projection display device are not inclined, the perpendicularity between the wall surface and the projection optical axis is ensured, so that the entire tip surface of the projecting object is in contact with the wall surface. By installing the wide-angle projection type image display device on the screen, the trapezoidal distortion of the projection screen is prevented, and the lens focus is automatically adjusted, so that handling is simplified.

  In addition, when the distortion correction operation is selected in the operation unit as described above, the trapezoidal distortion correction of the video signal data is performed based on the extension length of each protrusion measured by the extension measurement unit and the initial setting dimension. The projection distance from the projecting dimension to the center of the projection screen may be calculated to automatically adjust the focus of the lens. With this configuration, when the wide-angle projection display device is installed, if the installation surface is inclined upward or downward toward the wall surface, or above the wall surface when viewed from the wide-angle projection display device. Since the keystone distortion correction and the lens focus adjustment can be automatically performed simultaneously by the operation of the operation unit when the lens is tilted forward or backward, handling is simplified.

  Further, when the zoom setting is performed by the operation unit, the focus adjustment of the lens may be automatically performed with respect to the position of the zoom lens at that time. In this way, since the lens focus is automatically set in the zoom setting state, handling is simplified.

  Further, when the zoom is changed in the operation unit, the focus adjustment may be automatically performed on the position of the zoom lens after the zoom change. In this way, since the focus adjustment of the lens is automatically performed when the zoom is changed, handling is simplified.

  According to the present invention, the wide angle projection is performed by operating the operation unit at the time of installation so that the projecting object protrudes by an initial set dimension, and the projecting object is installed so that the tip of the projecting object abuts the wall surface constituting the projection surface. The type image display apparatus can enhance the perpendicularity between the projection optical axis and the wall surface constituting the projection plane as much as possible. Therefore, when there is no inclination or distortion on the installation surface and wall surface of the wide-angle projection display apparatus, it is possible to substantially prevent the occurrence of trapezoidal distortion. Also, when the installation surface of the wide-angle projection display is inclined upward or downward toward the wall, or when viewed from the wide-angle projection display, the upper side of the wall is inclined forward or backward. In such a case, since the software trapezoidal distortion correction is suppressed to a minimum, image quality deterioration due to the software trapezoidal distortion correction is suppressed to a minimum.

(Embodiment 1)
A wide-angle projection display apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings. The wide-angle projection-type image display device according to the present embodiment is a three-plate wide-angle liquid crystal projector using a liquid crystal panel as a light modulation element, and the liquid crystal projector is installed on the floor surface and the mounting surface of the mounting table. Thus, the installation work of the liquid crystal projector 1 in the installation mode in which the projection light is projected onto the wall surface is simplified.

First, the schematic structure of the liquid crystal projector according to the present embodiment will be described with reference to the schematic structure diagram shown in the side view of the installation explanatory diagram of FIG.
A wide-angle liquid crystal projector 1 according to the present embodiment includes a light source 2, a projection lens 3, and an aspherical reflection mirror 4 that reflects the projection light R from the projection lens 3 toward the projection surface inside the main body case 1 a. Control circuit components (not shown in FIG. 1) and the like are accommodated. In addition, as shown in FIGS. 1A to 1C, the liquid crystal projector 1 is configured such that a protrusion 5 made of four round bars can be protruded and stored by a motor from the outer surface 1b on the wall surface side. Is provided. The protrusions 5 are disposed at portions close to substantially four corners of the outer surface 1b, and are configured to advance and retreat based on an operation at an operation unit 17 described later.

  Further, as shown in the functional block diagram of FIG. 2, the liquid crystal projector 1 includes a video signal input unit 11 that inputs video signal data from an external video signal generator (not shown) and outputs it as a digital RGB signal; A video signal processing unit 12 that performs video signal processing such as image quality adjustment on the video signal data from the video signal input unit 11 and outputs it as analog data is provided. The liquid crystal projector 1 also receives a video signal data from the video signal processing unit 12, a liquid crystal drive circuit unit 13 that drives the liquid crystal panel, a control unit 14 that controls the whole, and a projecting object drive that moves the projecting object 5 forward and backward. A projection optical system drive unit 16 for projecting the projection light R light-modulated by the liquid crystal panel, and an operation unit 17 for operating the liquid crystal projector 1.

  The protrusion drive unit 15 includes a motor drive unit 15a that drives the protrusion 5 to advance and retract, and an extension measurement unit 15b. The motor drive unit 15a drives the motor so that all the protrusions 5 protrude by the initial set dimension L when the liquid crystal projector is installed. Further, in the case where the liquid crystal projector 1 is installed so that the protruding object 5 contacts the wall surface Z as much as possible, the installation surface of the liquid crystal projector 1 is inclined upward or downward toward the wall surface Z, or the liquid crystal projector When the top of the wall surface Z is inclined forward or backward as viewed from 1, a gap remains between the tip surface of the upper and lower protrusions 5 and the wall surface Z. In this case, when the trapezoidal distortion correction operation unit is operated in the operation unit 17, the motor driving unit 15 a is activated, and the motor extends all the protruding objects 5 whose tip surfaces are separated from the wall surface so as to contact the wall surface Z. . The extension measuring unit 15b measures the extension length when the protrusion 5 is extended in this way.

  In order to automatically adjust the focus of the lens, the projection optical system drive unit 16 performs zoom setting by the focus lens drive unit 16a that moves the position of the focus lens based on a command from the control unit 14 and the operation unit 17. The zoom lens driving unit 16b is provided for adjusting the movement of the zoom lens when it is performed.

  In addition to the power switch 17a of the liquid crystal projector 1, the operation unit 17 sets an initial setting dimension L of the projecting object 5 and issues a drive command, and a trapezoidal distortion correction operation for automatically operating trapezoidal distortion correction. 17c, a zoom adjustment operation unit 17d for setting a zoom amount, and the like.

  The protrusion 5 described above is installed so that the distance between the liquid crystal projector 1 and the wall surface Z is kept at a preset distance, and the projection optical axis of the liquid crystal projector 1 is perpendicular to the wall surface Z forming the projection surface. It functions as a jig. In addition, all projecting objects 5 whose tip surfaces are separated from the wall surface are extended so as to abut against the wall surface Z, and by measuring the extension length, trapezoidal distortion correction is automatically performed and automatic focus adjustment of the lens is possible. It is to make.

  A procedure of trapezoidal distortion adjustment and lens focus adjustment at the time of installation in the liquid crystal projector 1 according to the present embodiment will be described with reference to the flowchart of FIG. As shown in FIG. 1, the liquid crystal projector 1 is assumed to be installed stationary with the mounting surface 6 a of the mounting table 6 as an installation surface.

  First, the power switch 17a of the liquid crystal projector 1 is turned on (step S1), and the initial setting operation unit 17b is operated to set the protrusion 5 to project the initial setting dimension L when the liquid crystal projector 1 is installed (step S1). S2). The initial setting dimension L can be freely set within a predetermined range by the setting menu of the initial setting operation unit 17b. With this setting, in the liquid crystal projector 1, the motor driving unit 15 a is operated and the protrusion 5 protrudes by the initial set dimension L by the motor driving. The protrusions 5 are formed so as to protrude from the portions near the four corners of the outer surface 1b, and the initial setting dimension L of each protrusion 5 is set to be the same. Form. Therefore, when the front end surface of each protrusion 5 is in contact with the wall surface Z, the perpendicularity between the wall surface Z and the projection optical axis of the liquid crystal projector 1 is ensured.

  Next, the liquid crystal projector 1 is installed on the installation surface. At this time, the liquid crystal projector 1 is installed using the mounting surface 6a of the mounting table 6 as an installation surface so that as many tip surfaces of the protrusions 5 as possible come into contact with the wall surface Z (step S3). In the case of an ideal installation state in which the installation surface and the wall surface Z are neither distorted nor inclined as shown in FIG. 1, the tip surfaces of all the protrusions 5 can be installed in contact with the wall surface Z. In this case, trapezoidal distortion is not generated, so that it is not necessary to correct the trapezoidal distortion. Further, if the focus adjustment of the lens at the position of the focus lens is automatically performed when the initial dimension L is set, it is not necessary to adjust the focus of the lens after installation. In this embodiment, it is assumed to be configured as such. Therefore, when it is installed as shown in FIG. 1, step S4 and subsequent steps described below can be omitted.

  Next, when the wall surface Z is inclined in the left-right direction, when the liquid crystal projector 1 and the wall surface Z are viewed in a relative positional relationship, the liquid crystal projector 1 is in front of the left side with respect to the wall surface Z as shown in FIG. Is the same as when the angle θ1 is inclined. Accordingly, in this case, as shown in FIG. 1C, the installation posture of the liquid crystal projector 1 is corrected by the angle θ1 so that the tip surfaces of all the protrusions 5 are in contact with the wall surface Z. The verticality of 1 and the wall surface Z is ensured.

  In addition, as shown in FIG. 6A, when the mounting surface 6a of the mounting table 6 is inclined at an angle θ2 so as to become higher toward the wall surface Z, the tip surface of as many protrusions 5 as possible is disposed on the wall surface. When installed so as to be in contact with Z, the tip surface of the upper protrusion 5 is separated from the wall surface Z, and a gap having a gap length La is formed. In addition, when the mounting surface 6a of the mounting table 6 is horizontal and the wall surface Z is inclined backward as it goes upward, as described in FIG. 11 (a), the same as FIG. 6 (a). become. Further, when the mounting surface 6a of the mounting table 6 is inclined so as to become lower toward the wall surface Z, or when the mounting surface 6a is horizontal and the wall surface Z is inclined upward, the surface is inclined forward. As can be seen by referring to FIG. 9 and FIG. 11 (b), the lower protrusion 5 forms a gap, contrary to the case of FIG. 6 (a).

  Therefore, it is next selected that the trapezoidal distortion correction operation unit 17c of the operation unit 17 is operated to automatically perform the trapezoidal distortion correction (step S4). Thereby, when a gap is generated between the tip surface of the upper or lower protrusion 5 and the wall surface Z of the protrusion 5 as described above, all the protrusions 5 that generate the gap are set to the gap length. The length is extended by La and the tip end surface is brought into contact with the wall surface Z (step S5). Then, the extension length La (equal to the gap length La) of all the protrusions 5 extended by the extension measuring unit 15b is measured (step S6). Then, based on this measurement result and the above-described initial setting dimension L, the distortion correction amount of the video signal data is calculated in the control unit 14, and in the video signal processing unit 12 based on the instruction from the control unit 14, Distortion correction is performed (step S7). The extension length La may be measured, for example, by measuring the rotation angle of a motor that drives the protrusion 5 and calculating from the rotation angle.

  Next, the control unit 14 calculates the projection distance to the center of the projection screen based on the measurement result of the initial setting dimension L and the extension length La for all the protrusions 5 (step S8). Then, the current position of the focus lens is confirmed (step S9), and if the zoom is set, the current position of the zoom lens is confirmed (step S10), and the operating amount of the focus lens is calculated (step S11). . Then, based on the result, the focus lens driving unit operates to adjust the focus lens (step S12). In this way, the focus of the lens is adjusted.

  Further, when the zoom adjustment operation unit 17d of the operation unit 17 is subsequently operated to change the zoom setting value, the lens focus adjustment is automatically performed again as shown in FIG. That is, when the zoom setting value is changed by the zoom adjustment operation unit 17d (step S21), the zoom lens driving unit 16b is operated to adjust the position of the zoom lens (step S22). Next, the current position of the focus lens is confirmed (step S23), the current position of the zoom lens is confirmed (step S24), and the operating amount of the focus lens is calculated (step S25). Based on the result, the focus lens driving unit 16a is operated to adjust the focus lens (step S26). When the zoom setting value is changed in this way, the focus adjustment of the lens is automatically performed.

Since the embodiment according to the present invention is configured as described above, the following operational effects can be obtained.
(1) When the liquid crystal projector 1 is installed, the operation unit 17 is operated so that the protrusion 5 protrudes by an initial setting dimension L, and the front end surface of the protrusion 5 abuts against the wall surface Z constituting the projection surface. By installing, it is possible to install in a state where the perpendicularity between the wall surface Z forming the projection surface and the projection optical axis is as high as possible. Therefore, when the installation surface and the wall surface Z of the liquid crystal projector 1 are not inclined or distorted, the perpendicularity between the wall surface Z and the projection optical axis is secured, so that the generation of trapezoidal distortion is substantially prevented. Further, when the installation surface of the liquid crystal projector 1 is inclined upward or downward toward the wall surface Z, or when the upper side of the wall surface Z is inclined forward or backward as viewed from the liquid crystal projector 1 Can suppress software trapezoidal distortion correction to a minimum, and can suppress deterioration of image quality due to software-based trapezoidal distortion correction to a minimum.

(2) By changing the initial setting dimension L, the projection distance can be changed, and the size of the projection screen can be changed. Therefore, handling is simplified.
(3) When the installation surface of the liquid crystal projector 1 such as a floor surface or a mounting surface of the pedestal is inclined upward or downward toward the wall surface Z, or when the upper surface of the wall surface Z is viewed from the liquid crystal projector 1 When tilted in the forward or backward direction, the tilt can be calculated from the extension length of the protrusion, and the amount of strain can be calculated. Therefore, the trapezoidal distortion correction of the video signal data is performed based on this result. In this case, since the perpendicularity between the projection optical axis of the liquid crystal projector 1 and the wall surface Z is set as high as possible, software trapezoidal distortion correction is minimized. Therefore, image quality deterioration due to software-like trapezoidal distortion correction is minimized.

  (4) At the stage where the initial setting dimension L for installation in the liquid crystal projector 1 is set, the focus is set. Therefore, when the installation surface of the liquid crystal projector 1 and the wall surface Z are not inclined, the perpendicularity between the wall surface Z and the projection optical axis is ensured, so that the front end surface of all the protrusions 5 comes into contact with the wall surface Z. By simply installing the liquid crystal projector 1, the occurrence of trapezoidal distortion is substantially prevented and the focus adjustment of the lens is automatically performed.

  (5) When the liquid crystal projector 1 is installed, if the installation surface of the liquid crystal projector 1 is inclined upward or downward toward the wall surface Z, or the upper side of the wall surface Z when viewed from the liquid crystal projector 1 is the forward direction. Alternatively, when tilted backward, distortion correction and lens focus adjustment can be performed automatically and simultaneously by operation on the operation unit 17, so that handling is simplified.

  (6) When the zoom is set, the focus is automatically adjusted with respect to the position of the zoom lens at that time, so the lens focus is automatically set in the zoom setting state, and handling is simplified. .

  (7) When the zoom change is performed by the zoom adjustment operation unit 17d of the operation unit 17, the focus adjustment is automatically performed on the position of the zoom lens after the zoom change, so that handling is simplified.

(Modification)
The above embodiment can be modified as follows.
(1) The protrusion 5 has a circular cross section in the embodiment, but may have another shape. Further, although four protrusions 5 are used in the embodiment, the number of protrusions 5 may be any number as long as the tip surface forms a certain flat surface when the protrusions 5 are protruded by the initial setting dimension L. May be three or more.

  (2) In the above embodiment, the three-plate liquid crystal projector 1 is shown as the projection display apparatus. However, the present invention can also be applied to a liquid crystal projector 1 having another projection light generation system.

  (3) In the above embodiment, the liquid crystal projector 1 using the liquid crystal panel as the light modulation element is shown as the projection display apparatus. However, the present invention is not limited to this, and other image light generation systems are used. It is good also as a projection type projector provided with. For example, a DLP (Digital Light Processing) (registered trademark of Texas Instruments (TI)) system projector may be applied to the present invention.

  The projection display apparatus according to the present invention can be used as an image display system in various facilities such as a home theater, a conference room, a training room, a classroom, an amusement hall, various exhibition rooms, and a studio.

It is an installation state figure of the liquid crystal projector concerning an embodiment of the invention, and is a case where an installation surface and a wall are not inclined, (a) is an appearance perspective view, (b) is a side view, (c) is It is a top view. It is a functional block diagram which shows schematic structure of the projection type video display apparatus in the liquid crystal projector. It is the flowchart which showed the trapezoid distortion adjustment procedure at the time of installation of the liquid crystal projector, and the focus adjustment procedure of a lens. It is the flowchart which showed the focus adjustment procedure of the lens at the time of zoom change in the liquid crystal projector. FIG. 2 is a plan view of the liquid crystal projector installed in a plan view, and is a state diagram in which the liquid crystal projector is inclined leftward with respect to a wall surface Z; FIG. 6 is an explanatory diagram of the installation of the liquid crystal projector, in which the mounting surface of the mounting table is inclined upward toward the wall surface, and (a) a state diagram in which the protruding object protrudes by an initial set dimension. (B) State diagram after trapezoidal distortion correction. FIG. 6 is a diagram illustrating generation of trapezoidal distortion when a short focus projection type image display device is installed in a stationary manner, where the installation surface and the wall surface are not inclined, (a) is a plan view, (b) is a front view, (C) is a side view. It is the same figure, Comprising: It is a case where the mounting surface of a mounting base inclines upwards toward a wall surface, (a) is a top view, (b) is a front view, (c) is a side view. It is the same figure, Comprising: It is a case where the mounting surface of a mounting base inclines below toward a wall surface, (a) is a top view, (b) is a front view, (c) is a side view. It is the same explanatory drawing, and is a case where the installation posture of the liquid crystal projector is installed so as to be inclined toward the left direction with respect to the wall surface, (a) is a plan view, (b) is a front view, ( c) is a side view. In the same figure, (a) is a case where the wall surface is inclined backward as viewed from the liquid crystal projector, and (b) is a case where the wall surface is inclined forward.

Explanation of symbols

  L: Initial setting dimensions, R: Projection light, Z: Wall surface, La: Extension length, 1 ... Liquid crystal projector (as projection image display device), 1a ... Main body case, 4 ... Aspherical reflection mirror, 5 ... Projection An object drive unit, 15b, an extension measurement unit, and 17 an operation unit.

Claims (7)

The main body case, a projection lens using a short focus lens, an aspherical reflecting mirror that reflects the projection light from the projection lens toward the projection surface, and, in the case of a stationary installation, projecting from the main body case toward the wall surface A plurality of rod-like protrusions housed in the main body case, a protrusion driving part for moving the protrusions forward and backward, and an operation part for operating the apparatus,
The plurality of protrusions are composed of at least three so as to form a fixed plane by all the tip surfaces, and can project the initial set dimensions set in the operation unit in the case of stationary installation. A wide-angle projection-type image display device characterized by being configured as described above.   The wide-angle projection display apparatus according to claim 1, wherein an initial setting dimension of the protrusion is configured to be variably set by an operation in an operation unit.   In the state in which the protrusions are installed so that the tip surfaces of as many protrusions as possible come into contact with the wall surfaces, the tips of all the protrusions come into contact with the wall surfaces by selecting the distortion correction operation with the operation unit. In this case, the extension length of each protrusion is measured by the extension measuring unit, and the video signal data is based on the measured extension length of each protrusion and the initial dimension. The wide-angle projection display apparatus according to claim 1, wherein the trapezoidal distortion correction is automatically performed.   When an initial set dimension of the projecting object is set, a projection distance from the projecting dimension based on the initial set dimension to the center of the projection screen is calculated, and the focus adjustment of the lens is automatically performed. The wide-angle projection display apparatus according to claim 1 or 2.   The extension length of each protrusion measured by the extension measurement unit and the projection distance from the protrusion dimension based on the initial setting dimension to the center of the projection screen are calculated, and the focus adjustment of the lens is automatically performed. The projection display apparatus according to claim 3.   6. The wide-angle projection display apparatus according to claim 4, wherein when the zoom is set by the operation unit, the focus of the lens is automatically adjusted with respect to the position of the zoom lens set to zoom. .   The wide-angle projection display apparatus according to claim 6, wherein when the zoom is changed in the operation unit, focus adjustment is automatically performed on the position of the zoom lens after the zoom change.

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