JP3519393B2 - Projection display device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type display device such as a liquid crystal projector, and more particularly to an enlarged projection of an optical image on a screen via a projection lens. The present invention relates to a projection-type display device capable of correcting screen distortion that occurs when horizontally (diagonally) projecting.

[0002]

2. Description of the Related Art Conventionally, a projection type display device utilizing a liquid crystal light valve, a DMD (digital micromirror device) or the like has been known. For example, a projection type display device using a transmissive liquid crystal panel (liquid crystal light valve) as a light modulator separates white light emitted from a light source into three primary color lights and modulates each separated color light by a liquid crystal light valve. The optical image transmitted through the liquid crystal light valve is projected on the screen through the projection lens.

FIG. 12 is a perspective view showing such a conventional projection type display device. As shown in FIG. 12, the conventional projection type display device 80 includes a projection device 81 and a screen 82.

Here, when the projection device 81 is aligned with the center of the screen 82 and an optical image is projected from the front, a rectangular image 91 is projected, but actually, as shown in the figure, it is more than the center of the screen 82. In many cases, the projection device 81 is arranged on the lower side, and the projection lens 83 is directed obliquely upward to perform enlarged projection. This is generally a projection method called “aortic projection”, and is a method of projecting an image above the center of the projection lens.

However, in the case of tilted projection, the image projected on the screen is distorted into an inverted trapezoidal shape and extends upward toward the upper end of the screen, and spreads horizontally. Further, when the projection device is tilted and projected in the horizontal direction with respect to the screen, more complicated distortion occurs.

This situation will be described with reference to FIG. In FIG. 12, projection images 91, 92, and 93 show display examples of optical images projected on the screen 82. When the center of the projection device 81 and the center of the screen coincide with each other and the image is projected from the front, the optical image becomes a square image like the projection image 91, but the projection device 81 is actually below the screen 82. In addition, since it is arranged in the vertical direction with a predetermined inclination angle (vertical tilt angle Ky) and tilted by the projection lens 83, the image projected on the screen is distorted into a trapezoidal shape like the projected image 92, and the upper end of the projected image is displayed. As it goes to the part, it becomes a shape that extends upward and expands horizontally.

Further, when the projection device 81 is arranged on the screen 82 in a horizontal direction (for example, on the right side) at a predetermined inclination angle (horizontal tilt angle Kx), the upper right end of the projected image is further widened and the projected image is projected by the projection device 93. As shown, it distorts into a more complex shape.

FIG. 13 shows the projection images 91, 92, 9 described above.
FIG. 3 is a diagram of 3 viewed from the front side of a screen 82.

In order to correct such a distortion of the projected image, for example, in Japanese Unexamined Patent Publication No. 10-111533, the direction of projection from the projection device (for example, the inclination of the projection lens) is detected and the image distortion is automatically performed. A device for compensating for is described.

In the example described in this publication, in order to correct the distortion (reverse trapezoidal distortion) of the image projected on the screen, the image displayed on the liquid crystal light valve has a shape (trapezoid) opposite to the projection distortion. In this way, the correction amount is controlled according to the detection result from the projection direction detecting means.

Therefore, in the one described in the above publication, although the image distortion of the projection image 92 due to the vertical tilt projection can be corrected, the image of the projection image 93 when the projection device 81 is horizontally tilt projected. There is a disadvantage that the distortion cannot be corrected. In order to correct the distortion due to the horizontal tilt projection, the projection device 81 may be turned to face the screen, but depending on the place where the projection device is placed or the position of the screen,
In some cases, there is no choice but to perform horizontal tilt projection, and there has been a long-awaited demand for a distortion correction function by horizontal tilt projection.

In response to this, Japanese Patent Application No. 2001-247700 by the applicant of the present application discloses a first means for automatically correcting the image distortion in the vertical direction according to the detection result of the angle detecting means, and a user. A projection display device having a second means for correcting image distortion in the horizontal direction in response to an operation and capable of correcting the distortion of the display image on the screen even when the projection is performed in the vertical and horizontal directions. Have been described.

However, the above-mentioned Japanese Patent Application No. 2001-247.
In No. 700, the second means corrects the shape of the optical image emitted from the light modulating means according to the operation amount of a correction key for manually correcting the trapezoidal distortion of the remote control means. However, since the figure distortion of the projected image is not simple when horizontally projected, even if you try to correct the figure distortion using the correction key,
There was a problem that it was difficult to understand intuitively and the correction operation was difficult.

[0014]

As described above, in the conventional projection type display device, the distortion due to the horizontal tilt projection is corrected according to the operation amount of the correction key for manually correcting the trapezoidal distortion of the remote control means. Therefore, there is a problem that it is difficult to understand intuitively and the correction operation is difficult.

In view of such circumstances, it is an object of the present invention to provide a projection type display device capable of correcting distortion due to horizontal tilt projection by using an intuitive and easy-to-understand distortion correction adjusting method.

[0016]

According to a first aspect of the present invention, there is provided a projection type display apparatus, wherein light from a light source is incident and an optical image modulated based on an image signal is emitted, and the light modulating means. Projecting means for enlarging and projecting the optical image emitted from the modulating means onto the screen, and correcting the shape of the optical image emitted from the light modulating means, and correcting image distortion on the screen caused by tilted projection of the projecting means. In a projection display device including image distortion correction means, the image distortion correction means detects an angle detection means for detecting a vertical tilt angle of the projection means, and a vertical direction according to a detection result of the angle detection means. A first means for automatically correcting image distortion, and a means for correcting image distortion in a horizontal direction according to an operation amount, which has a rotation operation section, and is a means for horizontally adjusting the projection means with respect to the screen. Second means for correcting the image distortion in the horizontal direction by rotating the rotation operation part in the opposite direction by an angle corresponding to the tilt angle of the direction, wherein the rotation operation part comprises a rotation knob, The rotation knob is provided with a mark for adjusting the rotation angle thereof to a specific angle with respect to the surface of the screen, and the projection display device according to claim 2 of the present invention is ,
A light source, and a liquid crystal light valve on which light from the light source is incident, the light modulating means for emitting a light-modulated optical image by driving the liquid crystal light valve based on an image signal; and the light modulating means. Projection means for enlarging and projecting the optical image emitted from the screen onto the screen, and a step for correcting the shape of the optical image displayed on the liquid crystal light valve and correcting the image distortion on the screen caused by the tilted projection of the projection means. An angle detecting means for detecting a vertical inclination angle of the projection means, a first means for automatically correcting image distortion in the vertical direction according to a detection result of the angle detecting means, and a rotation operation Compensating for image distortion in the horizontal direction by rotating the rotation operation section in the opposite direction by an angle corresponding to the horizontal tilt angle of the projection means with respect to the screen. The image distortion correction means and means, comprising a, the rotation operating unit comprises at rotary knob,
The rotation knob is provided with a mark for adjusting the rotation angle thereof to a specific angle with respect to the surface of the screen, and the projection display device according to claim 3 of the present invention is provided. A light modulating means for emitting light from a light source and emitting an optical image modulated based on an image signal; a projecting means for enlarging and projecting the optical image emitted from the light modulating means onto a screen; and the light modulating means. In the projection display apparatus, the image distortion correction means corrects the shape of an optical image emitted from the projection means and corrects image distortion on the screen caused by tilted projection of the projection means. Angle detecting means for detecting a vertical tilt angle of the means, and first means for automatically correcting image distortion in the vertical direction according to the detection result of the angle detecting means,
A means for correcting image distortion in the horizontal direction according to an operation amount, which has a rotation operation part, and which rotates the rotation operation part in an opposite direction by an angle corresponding to a horizontal tilt angle of the projection means with respect to the screen Second means for correcting image distortion in the horizontal direction by rotating, and the rotation operating section is a turntable that supports the apparatus main body provided with the projection means. It is characterized in that a mark is provided for adjusting the horizontal installation angle of the device main body to a specific angle with respect to the surface of the screen,
A projection type display device according to claim 4 of the present invention includes a light source and a liquid crystal light valve on which light from the light source is incident,
A light modulating means for emitting a light-modulated optical image by driving the liquid crystal light valve based on an image signal, a projection means for enlarging and projecting the optical image emitted from the light modulating means on a screen, and the liquid crystal light. An angle detecting means for correcting the shape of the optical image displayed on the bulb to correct the image distortion on the screen caused by the tilting projection of the projection means, the angle detection means detecting the vertical inclination angle of the projection means. A first means for automatically correcting the image distortion in the vertical direction according to the detection result of the angle detecting means; and a horizontal operation angle corresponding to the horizontal tilt angle of the projection means with respect to the screen, which has a rotation operation section. Image distortion correction means including second means for correcting the image distortion in the horizontal direction by rotating the rotation operation part in the opposite direction by an angle, and the rotation operation part. It comprises a turntable supporting the device body provided with the projection means, and provided on this turntable is a mark for adjusting the horizontal installation angle of the device body to a specific angle with respect to the surface of the screen. It is characterized by.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 relate to a first embodiment of the present invention, FIG. 1 is a block diagram showing a projection type display device, FIG. 2 is a plan view showing the projection device, and FIG. 3 shows a relationship between the projection device and a screen. FIG.

First, referring to FIG. 3, the projection type display device 1
The relationship between the projection device 11 and the screen 12 that configure the above will be described.

In FIG. 3, the screen 12 is provided perpendicularly to the ground plane, and the projection device 11 is arranged so as to be inclined by a predetermined angle Ky with respect to the horizontal axis a. As a result, the optical image from the projection lens 13 is projected vertically on the screen 12 in the vertical direction. The angle Ky can be changed by adjusting the foot adjuster.

Next, the structure of such a projection device 11 will be described with reference to FIG. In FIG. 1, the projection device 11 includes a projection lens 13, a microcomputer (hereinafter, referred to as a microcomputer 21), a remote controller 22, and an operation unit 2.
3, a light source lamp 24, a lamp power supply circuit 25, a fan 26, a fan drive circuit 27, a liquid crystal panel 28,
Image processing circuit 29, signal source 30, and distortion correction circuit 31
A liquid crystal drive circuit 32, an inclination sensor 33, and a rotary knob 34.

The microcomputer 21 controls the operation of the projection device 11. The microcomputer 21 is provided with an input circuit (not shown) that receives instructions from the remote controller 22, the operation unit 23, and the rotary knob 34.

Further, the lamp power supply circuit 25 includes the light source lamp 2
4 is turned on and off. The fan drive circuit 27 drives the fan 26 for cooling the light source lamp 24.
Thereby, the projection device 11 irradiates the liquid crystal panel 28 with the light from the light source lamp 24.

A signal source 30 is connected to the video processing circuit 29, and a video signal obtained by receiving and processing a television broadcast signal and an information signal from a personal computer are supplied from the signal source 30.

The signal from the video processing circuit 29 is supplied to the liquid crystal drive circuit 32 via the distortion correction circuit 31.

The liquid crystal drive circuit 32 includes a distortion correction circuit 3
By driving the liquid crystal panel 28 by the signal supplied from the signal No. 1, the intensity of the transmitted light of the liquid crystal panel 28 is modulated and an optical image is displayed on the liquid crystal panel 28.

The optical image from the liquid crystal panel 28 is projected and displayed on the screen 12 via the projection lens 13.

The liquid crystal panel 28 may be a single plate type, or may be a multiple plate type using a plurality of (for example, three) liquid crystal panels. In the case of the multi-plate type, three liquid crystal panels are driven by R (red), G (green), and B (blue) primary color signals, respectively, and the light from the light source lamp is converted into R light, G light, and
It is configured such that the B light is split and made incident on each liquid crystal panel, and the transmitted light of each liquid crystal panel is recombined and projected on the screen.

The tilt sensor 33 functions as an angle sensor for measuring the vertical tilt angle (Ky) of the projection device 11. The detection result from the tilt sensor 33 is supplied to the microcomputer 21. The microcomputer 21 creates data on the tilt angle based on the detection result from the tilt sensor 33 and supplies the data to the distortion correction circuit 31. Based on the data from the microcomputer 21, the distortion correction circuit 31 corrects the image displayed on the liquid crystal panel 28 according to the detected angle in order to correct the distortion due to vertical tilt projection (see 92 in FIG. 13). I have to.

In addition to the power key 37 and the menu key 38, the remote controller 22 is provided with an automatic trapezoidal distortion correction key 39 and the like.

The rotary knob 34 serves as a rotary operation unit for performing a rotary operation for correcting image distortion in the horizontal direction by a user operation. The rotary knob 34 outputs a voltage having a predetermined voltage value according to the rotation angle by a variable resistor or a rotary switch. The microcomputer 21 converts the output voltage of the rotary knob 34 into data related to the horizontal tilt angle set by the user operation, and the distortion correction circuit 31.
Supply to.

As a result, the distortion correction circuit 31 automatically corrects the image distortion in the vertical direction according to the detection result of the tilt sensor 33, and the horizontal tilt angle for correction with the rotation angle of the rotary knob 34. The image distortion in the horizontal direction is corrected so that

Next, the rotary knob 34 will be described in more detail with reference to FIG. In FIG. 2A, the rotary knob 34 is rotatably provided on the upper surface of the casing 35 of the projection device 11 toward the front left side. in this case,
The rotary shaft of the rotary knob 34 is perpendicular to the upper surface of the housing 35.

A mark 36 is provided on the upper surface of the rotary knob 34 for adjusting the rotation angle thereof to a specific angle with respect to the surface of the screen. The mark 36 is, for example, a straight line for aligning in parallel with the surface of the screen is printed on the upper surface of the rotary knob 34 by silk printing.

With such a configuration, the liquid crystal panel 28 and the image processing circuit 29 serve as a light modulator that receives the light from the light source lamp 24 and emits an optical image modulated based on the image signal from the signal source 30. Has become.

The projection lens 13 serves as projection means for enlarging and projecting the optical image emitted from the light modulating means on the screen.

The tilt sensor 33 is an angle detecting means for detecting the vertical tilt angle of the projection means.

The rotary knob 34 serves as a rotary operation section for performing a rotary operation for correcting a horizontal image distortion by a user operation.

The microcomputer 21 and the distortion correction circuit 31 are the first means for automatically correcting the image distortion in the vertical direction according to the detection result of the angle detection means.

Further, the microcomputer 21 and the distortion correction circuit 31
Is a second means for correcting the image distortion in the horizontal direction so that the rotation angle of the rotation operation section and the tilt angle in the horizontal direction for correction are equal.

Next, the operation of the projection type display device 1 will be described with reference to FIGS. 4 to 6.

FIG. 4 is an explanatory view for explaining vertical and horizontal tilt angles of the projection device 11, and FIG. 5 is a projection device 11.
6 is an explanatory view for explaining the projection angle of the liquid crystal panel 2
It is explanatory drawing explaining the optical image displayed on FIG.

First, the correction in the case of tilt projection in the vertical and horizontal directions will be described.

Assuming that the horizontal tilt angle is Kx and the vertical tilt angle is Ky as shown in FIG. 4, the horizontal projection angle Tx and the vertical projection angle shown in FIGS. Distortion correction is performed by converting the point (x, y) on the screen of Ty into (x ′, y ′).

When the image displayed on the screen 12 is distorted into a trapezoidal shape, the optical image displayed on the liquid crystal panel 28 is as shown in FIG.
The correction may be made as indicated by the broken line.

For example, if the image displayed at the coordinates (x, y) in the upper right of FIG. 6 in the first quadrant is displayed at the position indicated by the coordinates (x ', y'), the trapezoidal distortion on the screen is corrected. can do.

The coordinates (x ', y') are shown in FIGS.
Therefore, for example, x '= x (cos Kx-sin Kx · tan Tx) − y (tan Ky · tanTx) y' ＝ y (cos Ky − sin Ky · tan Ty) − y (tan Kx · tanTy) Can be found at.

Also, as in the first quadrant, the second to fourth
The quadrant coordinates (x ′, y ′) can also be obtained.

The operation method of the first embodiment will be described in detail below. 7 is an explanatory view showing a horizontal projection range when the vertical and horizontal tilt angles of the projection device 11 are 0 °, and FIG. 8 is a vertical and horizontal tilt angle of the projection device 11 is 0 °. FIG. 9 is an explanatory diagram showing a vertical projection range in the case, and FIG. 9 is an explanatory diagram illustrating an image displayed on the screen.

As shown in FIG. 7, when the vertical and horizontal tilt angles of the projection device 11 are set to 0 °, the screen 1
2 to 0 to 21.8 ° to the right and 0 to 2 to the left
Projection is performed within a range of 1.8 ° and a projected image is displayed.

As shown in FIG. 8, when the vertical and horizontal tilt angles of the projection device 11 are 0 °, the screen 1
2 is projected upward in the range of 0 ° to 28.3 ° and downward in the range of 0 ° to 3.4 °, and the projected image is displayed.

When the projection device 11 tilts 10 ° to the right and 15 ° in the vertical direction, a trapezoidal distortion 43 as shown by the broken line in FIG. 9 is displayed on the screen 12. Since such distortion 43 has a complicated shape, it is difficult to intuitively understand what kind of correction should be made, and since it cannot be corrected unless two items of horizontal and vertical are adjusted, the conventional method requires manual operation. Adjustment is difficult.

In the present invention, first, the distortion correction circuit 31 automatically corrects the trapezoidal distortion in the vertical direction based on the tilt angle Ky in the vertical direction, which is the data of the tilt sensor 33 built in the projection apparatus 11. The corrected graphic becomes as shown by the alternate long and short dash line 42 in FIG. 9, and then the user manually adjusts the rotary knob 34 to align the mark 36 with the plane of the screen 12, for example. As a result, an output of the horizontal tilt angle Kx is obtained from the rotary knob 34, and the distortion correction circuit 31 automatically corrects the horizontal trapezoidal distortion based on the horizontal tilt angle Kx. As a result, in the corrected figure, the upper and lower parts of the projected image become horizontal as shown by the solid line 41 in FIG. That is, as shown in FIG. 2B, when the projection device 11 is tilted leftward with respect to the screen 12 by an angle α, the rotary knob 34 is marked with a mark 36.
If the image is rotated rightward by an angle α so that it becomes horizontal to the surface of the screen 12, it is possible to correct the distortion when tilting and projecting to the left. Further, as shown in FIG. 2C, when the projection device 11 is tilted to the right by an angle γ with respect to the screen 12, the rotary knob 34 is moved to the left so that the mark 36 is parallel to the surface of the screen 12. If the image is rotated by the angle γ in the direction, it is possible to correct the distortion when the tilting projection is performed to the right. This makes it possible to easily adjust the distortion of a complicated shape in which horizontal and vertical trapezoidal distortions are mixed.

As described above, according to the first embodiment, the distortion due to the horizontal tilting projection can be corrected by using the distortion correction adjusting method which is intuitive and easy to understand, so that the correction operation is easy. Therefore, even when the projection is performed vertically and horizontally, the distortion of the display image on the screen can be corrected by a simple correction operation, and the installation work time of the projection display device can be shortened.

10 to 11 relate to the second embodiment of the present invention. FIG. 10 is a perspective view showing a projection device, and FIG. 11 is a bottom view showing the projection device.

In FIG. 10, the casing 52 of the projection device 51
A turntable 54 is rotatably provided on the lower surface of the. The rotation axis of the turntable 54 is perpendicular to the lower surface of the housing 52.

The rotary table 54 is a combination of the knob for adjusting the horizontal tilt correction in the first embodiment and the rotary table for supporting the apparatus main body provided with the projection lens 13.

As shown in FIG. 11, the turntable 54 has a shape in which a part of a circle is missing. The part 55 that is linear due to the lack of a part of the circle of the turntable 54
It serves as a mark for adjusting the installation angle in the horizontal direction to a specific angle with respect to the plane of the screen.

Further, the same correction method as in the first embodiment is used for correcting the vertical distortion in the second embodiment.

In the second embodiment as well, since the rotation angle of the turntable 54, which serves as the rotation operation unit, and the amount of horizontal distortion correction by the distortion correction circuit are interlocked with each other, when the projection device 51 is installed in advance, the screen By setting the orientation of the rotary table 54, it is possible to obtain a projected image without distortion regardless of the orientation of the apparatus main body provided with the projection lens 13.

Specifically, the direction in which a part of the circle of the rotary table 54 is cut is directed toward the screen, and the linear portion 55 is installed parallel to the screen. The main body of the projection device 51 can rotate in the horizontal direction on the turntable 54, and the horizontal tilt correction is performed according to the rotation angle. Therefore, even if the device body is rotated, the image projected on the screen is a correctly corrected image.

As described above, according to the second embodiment, if the orientations of the screen and the turntable 54 are set in advance when the projection device 51 is installed, the projection lens 1
Since a projection image without distortion can be obtained regardless of the orientation of the apparatus main body provided with 3, the same effect as that of the first embodiment can be obtained.

In the above description, the projection type display device using the transmissive liquid crystal light valve has been described as an example. However, in addition to this, the projection type display device using the reflection type liquid crystal panel, C
It goes without saying that the present invention can also be applied to other projection type display devices such as an RT type projection type display device or a projection type display device using a micromirror device (DMD).

[0063]

As described above, in the projection display device of the present invention, trapezoidal distortion can be easily corrected even when the projection device is projected in the vertical and horizontal directions with respect to the screen. It is possible to shorten the installation work time of the projection display device.

[Brief description of drawings]

FIG. 1 is a block diagram showing a projection type display device according to a first embodiment of the invention.

FIG. 2 is a plan view showing a projection device according to the first embodiment of the present invention.

FIG. 3 is a layout diagram showing a relationship between a projection device and a screen according to the first embodiment of the present invention.

FIG. 4 is an explanatory diagram illustrating a tilt angle of the projection device according to the first embodiment of the present invention.

FIG. 5 is an explanatory diagram illustrating a projection angle of the projection device according to the first embodiment of the present invention.

FIG. 6 is an explanatory diagram illustrating an optical image displayed on the liquid crystal panel according to the first embodiment of the present invention.

FIG. 7 is an explanatory diagram showing a horizontal projection range of the projection device according to the first embodiment of the present invention.

FIG. 8 is an explanatory diagram showing a vertical projection range of the projection device according to the first embodiment of the present invention.

FIG. 9 is an explanatory diagram illustrating an image displayed on the screen according to the first embodiment of the present invention.

FIG. 10 is a perspective view showing a projection device according to a second embodiment of the present invention.

FIG. 11 is a bottom view showing the projection device according to the second embodiment of the present invention.

FIG. 12 is an explanatory diagram illustrating a state of tilt projection by a conventional projection display device.

FIG. 13 is an explanatory diagram illustrating an example of a projection image by a conventional projection display device.

[Explanation of symbols]

1 Projection display device 11 Projector 12 screens 13 Projection lens 21 Microcomputer 28 LCD panel 29 Video processing circuit 31 Distortion correction circuit 32 LCD drive circuit 33 Tilt sensor 34 Rotary knob

Claims (4)

(57) [Claims] 1. Light from a light source is incident on the basis of an image signal.
Light modulating means for emitting a modulated optical image, and the optical modulator
The optical image emitted from the adjusting means is enlarged and projected on the screen.
Projection means and an optical image emitted from the light modulation means.
The shape is corrected and caused by the tilting projection of the projection means.
Image distortion correction means for correcting image distortion on the screen
In the projection type display device, the image distortion correction means detects an angle of inclination of the projection means in a vertical direction.
And image distortion in the vertical direction according to the detection result of the angle detection means.
Image correction in the horizontal direction according to the operation amount
Means for correcting the
Reverse the angle corresponding to the horizontal tilt angle of the projection means
By rotating the rotary operation part in the horizontal direction
And a second means for correcting the image distortion of the above , wherein the rotation operation part is composed of a rotation knob, and the rotation knob is for adjusting the rotation angle to a specific angle with respect to the surface of the screen. A projection type display device characterized by being provided with a mark. 2. A light source and a liquid crystal light valve on which light from the light source is incident.
Drive the liquid crystal light valve based on the image signal.
And an optical image emitted from the optical modulator, and an optical image emitted from the optical modulator on the screen.
Corrects the shape of the optical image displayed on the liquid crystal light valve and the projection means for large projection
The screen produced by the tilting projection of the projection means
And a projection means for correcting image distortion on the screen.
An angle detecting means for detecting a vertical inclination angle of
Image distortion in the vertical direction is detected according to the detection result of the angle detection means.
It has a first means for automatically correcting and a rotation operation section,
Horizontal tilt angle of the projection means with respect to the screen
Rotate the rotation operation part in the opposite direction by the angle corresponding to
Means for correcting horizontal image distortion by adjusting
And an image distortion correction means including the image forming apparatus, wherein the rotation operation section is composed of a rotation knob, and a mark for adjusting the rotation angle to a specific angle with respect to the surface of the screen is provided on the rotation knob. A projection display device characterized by being provided. 3. Light from a light source is incident on the basis of an image signal.
Light modulating means for emitting a modulated optical image, and the optical modulator
The optical image emitted from the adjusting means is enlarged and projected on the screen.
Projection means and an optical image emitted from the light modulation means.
The shape is corrected and caused by the tilting projection of the projection means.
Image distortion correction means for correcting image distortion on the screen
In the projection type display device, the image distortion correction means detects an angle of inclination of the projection means in a vertical direction.
And image distortion in the vertical direction according to the detection result of the angle detection means.
Image correction in the horizontal direction according to the operation amount
Means for correcting the
Reverse the angle corresponding to the horizontal tilt angle of the projection means
By rotating the rotary operation part in the horizontal direction
Second means for compensating for image distortion of the device, and the rotation operation part comprises a turntable that supports the device body provided with the projection means. A projection type display device comprising a mark for adjusting an installation angle to a specific angle with respect to the surface of the screen. 4. A light source, and a liquid crystal light valve into which light from the light source is incident.
Drive the liquid crystal light valve based on the image signal.
And an optical image emitted from the optical modulator, and an optical image emitted from the optical modulator on the screen.
Corrects the shape of the optical image displayed on the liquid crystal light valve and the projection means for large projection
The screen produced by the tilting projection of the projection means
And a projection means for correcting image distortion on the screen.
An angle detecting means for detecting a vertical inclination angle of
Image distortion in the vertical direction is detected according to the detection result of the angle detection means.
It has a first means for automatically correcting and a rotation operation section,
Horizontal tilt angle of the projection means with respect to the screen
Rotate the rotation operation part in the opposite direction by the angle corresponding to
Means for correcting horizontal image distortion by adjusting
And an image distortion correction unit including a rotary operation unit that supports a main body of the apparatus provided with the projection unit. The rotary base is provided with a horizontal installation angle of the main body of the apparatus. A projection type display device, characterized in that a mark is provided for adjusting the screen to a specific angle.