JP4420739B2 - Projection type image display device - Google Patents

Description

The present invention relates to a projection type image display equipment.

  2. Description of the Related Art Conventionally, a projection type image display device that projects an optical image and projects it onto a screen via a projection lens, such as a liquid crystal projector, is known. The projection type image display device, for example, irradiates a light valve element such as a liquid crystal panel with a light beam from a light source such as a light bulb and projects the transmitted light on a screen, and the polarization amount is adjusted for each pixel in the light valve element. As a result, arbitrary display is performed. There are two types of light valve elements, transmission type and reflection type, depending on the operation method.

  In the conventional projection type image display device, when an optical image is projected from the front with the projection device aligned with the center of the screen, a square projection image is projected on the screen, but actually, it is more than the center of the screen. In many cases, a projection device is arranged on the lower side, and the projection lens is obliquely upwardly projected. This is generally a projection method called “tilting projection”, in which an image is projected above the center of the projection lens.

  However, when tilting projection is performed, the image projected on the screen is distorted in an inverted trapezoidal shape, extending upwards toward the upper end of the screen, and spreading in the horizontal direction. On the contrary, the same result is obtained when the projection device is arranged above the screen. In addition, when the projection device is in a horizontal direction with respect to the screen and is projected, more complicated distortion occurs.

  In order to correct the distortion of the projected image due to the above-described tilt projection, an apparatus that automatically corrects the image distortion by detecting the projection direction (for example, the inclination of the projection lens) from the projection apparatus has been proposed (for example, , See Patent Document 1). In order to correct distortion (inverted trapezoidal distortion) of the image projected on the screen, the device described in Patent Document 1 makes the image displayed on the liquid crystal light valve have a shape (trapezoidal shape) opposite to the projection distortion. Correction is performed, and the correction amount is controlled in accordance with the detection result from the projection direction detection means.

  Moreover, in the apparatus described in Patent Document 1, in order to eliminate the inconvenience that the image distortion of the projected image cannot be corrected when the projection apparatus is in the horizontal direction and the projection is performed, not only in the vertical direction but also in the horizontal direction. There has also been proposed an apparatus capable of correcting distortion caused by tilting projection in a direction (see, for example, Patent Documents 2 and 3).

  Japanese Patent Application Laid-Open No. 2004-228688 discloses a first unit that automatically corrects vertical image distortion according to a detection result of an angle detection unit such as a tilt sensor, and a first unit that corrects horizontal image distortion according to a user operation. And a projection display device capable of correcting distortion of a display image on a screen even when projected in the vertical and horizontal directions. Further, in Patent Document 3, in order to eliminate the problem that the apparatus described in Patent Document 2 is difficult in terms of correction operation, it is mainly configured with vertical lines when adjusting vertical tilt correction. A projection display device that displays an adjustment pattern mainly composed of horizontal lines when displaying the adjustment pattern and adjusting horizontal image distortion is described.

  On the other hand, when installing the projection type image display device, installation at an inclined installation angle invites the inclination of the projection image and is difficult for the viewer to see. Further, when stack setting or multi-screen setting is used with a plurality of projection type image display devices, the inclination of the image due to each projection screen becomes conspicuous. Note that the stack setting is a setting in which multiple units are installed one above the other, and the image is projected on one screen. The multi-screen setting is not limited to the upper and lower units, but one unit with multiple units installed on the left and right. In this setting, the image is projected on the screen, and these settings improve the dynamic range and gradation of the image.

  FIG. 9 is a diagram for explaining correction of image tilt in a projection-type image display device of the prior art. FIG. 9A is a display before adjustment when a multi-screen with three horizontal screens is configured, and is based on the OSD standard. FIG. 9B shows a state where the OSD reference line is shifted in the display before adjustment when a 3 × 3 9-screen multi-screen is configured. In the figure, 2a, 2b and 2c are areas to be projected on the screen in each projection type image display device, 30a, 30b and 30c are actual projection screens by each projection type image display device, and 31a, 31b and 31c are each It is an OSD (On Screen Display) reference line by a projection type image display apparatus.

In the case of installation adjustment using only the projected image, for example, the projection screen 30a and the OSD reference line 31a are projected onto the screen and visually adjusted. As illustrated in FIGS. 9A and 9B, the OSD reference is used. Even when the line 31a is projected, the OSD reference line 31a tends to be shifted. Therefore, even if it looks as if it is correctly aligned, there may actually be a slight shift as shown in FIGS. 9 (A) and 9 (B). This is not limited to the stack setting or the multi-screen setting, and the same deviation naturally occurs in one projection type image display apparatus. This deviation causes distortion of the image (projected image 30a and the like) as if projected.
JP-A-10-111533 JP 2003-057552 A JP 2003-198995 A

  However, the correction of tilt according to the conventional technique has a limit because only the correction line projected on the projection type image display apparatus is used and the tilt is corrected by looking at the correction line. Actually, it is very difficult to adjust the vertical and horizontal tilts in the projected image, and when adjusting two projection type image display devices to three units, as shown in FIG. Become. Further, the projection type image display device described in Patent Documents 1-3 corrects the projected image to eliminate screen distortion, and corrects the projected image even if the correction compensates for the tilt. Therefore, image quality degradation occurs.

The present invention has been made in view of such circumstances described above, the inclination of the projection screen of the projection type image display device, accurately correct projection morphism type image display equipment which can be without the image quality is deteriorated The purpose is to provide.

The present invention is constituted by the following technical means in order to solve the above-described problems.
The first technical means is a projection type image display device provided with an inclination correction unit for correcting the inclination of the projection image, and the inclination correction unit detects an inclination of the projection type image display device with respect to a gravitational field. The projection type has a detection unit and is projected onto the screen by superimposing a fixed line fixed to the projection type image display device and a correction line according to the tilt detected by the tilt detection unit. It is characterized in that the vertical and horizontal installation angles of the image display device can be adjusted.

  The second technical means includes light modulation means for emitting light from the light source and emitting an optical image modulated based on the image signal, and image projection means for projecting the optical image emitted from the light modulation means. An inclination correction means for correcting the inclination of the projection image projected by the image projection means, wherein the inclination correction means is fixed to the projection type image display apparatus. A fixed line projecting unit for projecting a line by the image projecting unit, an inclination detecting unit for detecting an inclination of the projection type image display device with respect to a gravitational field, and a correction line corresponding to the tilt detected by the tilt detecting unit. Correction line projecting means for projecting by the image projecting means, and by projecting the fixed line and the correction line on the screen in an overlapping manner, the vertical and horizontal installation angles of the projection type image display device Is obtained is characterized in that to enable settling.

  According to a third technical means, in the second technical means, the correction line projecting means generates an image signal for projecting the correction line by the image projecting means based on an inclination detection signal in the inclination detecting means. And a means for outputting to the light modulation means.

  According to a fourth technical means, in the second or third technical means, the fixed line projecting means outputs an image signal for projecting the fixed line by the image projecting means to the light modulating means. It is characterized by that.

  A fifth technical means is the technical means according to any one of the first to fourth technical means, wherein the inclination correcting means has an adjuster for adjusting the installation angle at the bottom of the projection type image display apparatus. It is what.

  A sixth technical means is any one of the first to fifth technical means, wherein the inclination detecting means is means for detecting an inclination of the projection lens with respect to the gravitational field in the projection type image display apparatus. It is what.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to correct | amend correctly the inclination of the projection screen of a projection type image display apparatus, without image quality deterioration.

  FIG. 1 is a schematic diagram illustrating a configuration example of a projection type image display apparatus according to an embodiment of the present invention, and FIG. 2 is a functional block diagram of main parts in the projection type image display apparatus of FIG. In the figure, 1 is a projection type image display device, 2 is a screen, 10 is a projection type image display device main body (housing), 11 is a projection unit, 21 is an angle sensor as an example of an inclination detection means, and 22 is a vertical angle adjustment. Adjuster 23 for adjusting the left / right angle, 24 for the angle sensor reference line generating circuit, 25 for the OSD reference line generating circuit, 26 for the OSD data synthesis circuit, α for the left / right angle, and β for the upper / lower angle.

  A projection-type image display apparatus (hereinafter referred to as a projector) according to the present invention includes an inclination correction unit that corrects an inclination of a projection image, and the inclination correction unit detects an inclination of the projector with respect to a gravitational field. It has detection means, and the projector's vertical, left, and right installation angles can be adjusted by projecting the fixed line fixed to the projector and the correction line corresponding to the inclination detected by the inclination detection means onto the screen. And Here, “adjustable” means that the user can assist with adjustment. Actually, the fixed line and the correction line are displayed on the screen so that the user can change the projector installation angle (vertical installation angle and / or left and right installation angle), and the fixed line and the correction line are displayed. The installation angle can be adjusted to match. Further, the tilt detection means is preferably means for detecting the tilt of the projection lens with respect to the gravitational field of the projector, and here it also includes detecting the tilt of the portion fixed to the projection lens. This tilt detection means is used to finally eliminate the physical tilt of the projector.

  The present invention can also be employed as an inclination correction device (a circuit or software for incorporation into a projector) including the inclination correction means and an inclination correction means according to each embodiment described later. A tilt sensor that detects the tilt with respect to the gravitational field is attached to measure the tilt of the projector installation state, and the correction line based on the measurement result and the fixed display line that is fixed to the projector are projected and displayed. Since the inclination can be corrected accurately and easily by matching (adjusting them so as to overlap each other), it is also called a projector installation auxiliary mechanism (projector installation auxiliary accessory device).

  The projector 1 normally includes a light modulation unit and an image projection unit as the projection unit 11. Here, the light modulation unit is a unit that emits an optical image that is modulated based on an image signal upon incidence of light from a light source, and the image projection unit receives the optical image emitted from the light modulation unit. The image projection unit projects a still image such as a video or a slide to be projected on the screen. Hereinafter, a projector according to an embodiment of the present invention will be described with reference to the drawings, assuming that the inclination correction unit corrects the inclination of the projected image projected by the image projection unit. The projection unit 11 may be a means for simply inserting an image film or the like and projecting the image film or the like onto the screen 2 or the like. However, the projection unit 11 needs to have a structure capable of projecting a correction line and a fixed line.

  A projector 1 according to the configuration example described with reference to FIGS. 1 and 2 includes a main body (housing) 10, a projection unit 11 including a projection lens, a light source, and the like, an angle sensor 21 as an example of an inclination detection unit, and a vertical angle adjustment unit. An adjuster 22, a left / right angle adjustment adjuster 23, an angle sensor reference line generation circuit 24, an OSD reference line generation circuit 25, and an OSD data synthesis circuit 26 are provided, and a projection image is projected onto the screen 2. As illustrated in FIG. 1, the installation angle of the main body 10 is expressed by a left / right angle α and a vertical angle β. As in this example, the tilt correction means preferably includes an adjuster for adjusting the installation angle at the bottom of the projector (generally the bottom of the housing), but a pedestal having a thickness that is simply desired to be adjusted is provided on the housing 10. It may be sandwiched below.

  The inclination correcting means includes fixed line projecting means as means for projecting a fixed line, and correction line projecting means as means for projecting the correction line. The fixed line projecting means is a means for projecting a fixed line fixed to the projector, that is, a reference line indicating the current installation position (position on the vertical plane) by the image projecting means. The fixed line projecting unit may be any unit that outputs an image signal for projecting the fixed line by the image projecting unit to the light modulating unit, but may be simply replaced with a film containing a reference line. The correction line projecting unit projects the correction line corresponding to the tilt detected by the tilt detecting unit using the image projecting unit. The correction line projection unit is a unit that generates an image signal for projecting the correction line by the image projection unit based on the tilt detection signal in the tilt detection unit, and outputs the image signal to the light modulation unit. Based on this, a correction line is projected. Note that a film with a correction line installed so as to face downward by the function of the pendulum can be substituted.

  As described above, the fixed line and the correction line are overlapped and projected onto the screen 2, thereby enabling adjustment of the installation angle of the projector 1 in the vertical and horizontal directions. Hereinafter, the fixed line will be described as an OSD reference line, and the correction line will be described as an angle sensor reference line. The “installation angle” is not limited to the installation angle of the housing 10 of the projector 1, but is preferably the installation angle of the projection lens in the projection unit 11 as described above. It becomes the direction of gravity (or the direction of a plane perpendicular to the direction of gravity).

  Here, an inclination detecting means such as an angle sensor for detecting the inclination with respect to the gravitational field is exemplified. By using an acceleration sensor under gravity as the inclination detecting means, the inclination can be detected. As a detection method of the acceleration sensor, there are a piezoelectric type, a capacitance type, a piezoresistive type, and the like, and any method may be adopted. Here, only an example using a piezoresistive element will be briefly described as a piezoresistive detection method. A piezoresistive element is formed on a silicon single crystal substrate by a semiconductor process such as an ion implantation apparatus, and has a feature that the resistance value of the element increases or decreases when a tensile or compressive stress is applied by a mechanical external force or the like. . That is, by adopting a structure in which stress is applied to the piezoresistive element when acceleration is applied, the acceleration can be detected as a resistance change of the piezoresistive element.

  Next, the principle of detecting inclination with an acceleration sensor (three-axis acceleration sensor) will be described. The acceleration sensor is an inertial sensor that measures a component obtained by subtracting the gravitational acceleration component (g) from the motion acceleration component (a) with respect to the input axis (sensitive axis) direction. That is, the display acceleration (A) of this acceleration sensor is represented by A = a−g. Here, g is 1 g vertically downward. Accordingly, the acceleration sensor (a = 0) fixed on the earth displays +1 g when the sensitive axis is vertically upward, and +1 g of cos θ when the sensitive axis is inclined at an angle θ from the vertically upward direction. Display double. If this is utilized, the angle at which each axis is tilted from the vertical axis can be obtained from the gravitational acceleration detection values of the three axes of the acceleration sensor.

  FIG. 3 is a diagram for explaining a method of expressing the posture of the acceleration sensor attached to the object. First, a method for expressing the attitude of an acceleration sensor attached to an object is defined as follows based on FIG. In general, with respect to any axis, the posture is expressed by the angles θx, θy, and θz with respect to each axis measured from the vertical axis. In this expression method, the X axis, the Y axis, and the Z axis are handled in an equal manner, which is suitable for expressing an arbitrary posture. On the other hand, when the Z axis coincides with the vertical axis, the standard posture is used. In order to express the inclination from this standard posture, the angles α and β from the horizontal plane for the X and Y axes (signs are upward from the horizontal plane). Is more practical. In this definition, α, β, and θz are all zero when there is no inclination. In the present embodiment, α is used as the left and right installation angles, and β is used as the upper and lower installation angles.

  4 to 6 are diagrams for explaining the OSD reference line and the angle sensor reference line to be projected in the projection type image display apparatus shown in FIGS. 1 and 2, and the matching process thereof. In the figure, reference numeral 24a denotes an angle. A sensor reference line 25a is an OSD reference line. With reference to FIGS. 4 to 6, a mechanism for projecting a correction line on the projection type image display device based on the detected tilt signal will be exemplified below.

  4A shows an example of the OSD reference line, FIG. 4B shows an example of the angle sensor reference line when the projector is tilted in the vertical direction, and FIG. 4C shows the projector in the horizontal direction. FIG. 5A shows an example of the angle sensor reference line in a tilted state, FIG. 5A shows the matching process of two reference lines when the projector is tilted up and down, and FIG. 5B shows the projector tilted in the left and right direction. FIG. 5 (C) shows how the two reference lines are matched, FIG. 5 (B) shows how it looks when projected on the screen, and FIGS. 6 (A) to 6 (C) show how the projector looks. The matching processing of two reference lines in a state tilted in the vertical direction and the horizontal direction is shown.

  As illustrated in FIG. 1, in a projector having an angle sensor 21 built in the projector 1 and having an up / down angle adjustment adjuster 22 and a left / right angle adjustment adjuster 23, an angle sensor reference line generation circuit 24, an OSD reference line generation A circuit 25 and an OSD data synthesis circuit 26 are provided. The OSD reference line generation circuit 25 generates an OSD reference line 25a as shown in FIG. Further, the angle sensor reference line generation circuit 24 generates an angle sensor reference line 24a shown in FIG. 4B or 4C based on information from the angle sensor 21. In addition, although the cross reference line is illustrated here as the OSD reference line 25a and the angle sensor reference line 24a, the present invention is not limited to this.

  The generation of the reference line in the angle sensor reference line generation circuit 24 and the OSD reference line generation circuit 25 will be described. When a projection (or angle adjustment) of the OSD reference line 25a is instructed by a user operation unit (not shown) (which may be a remote controller or the like), the microcomputer instructs the OSD reference line generation circuit 25, and in the example of the liquid crystal projector, a liquid crystal drive circuit Is driven to control the liquid crystal panel to display the OSD reference line 25a, and is projected from the projection lens onto the screen 2. Further, when the projection (or angle adjustment) of the angle sensor reference line 24 a is instructed by the user operation unit, the microcomputer instructs the angle sensor reference line generation circuit 24 and similarly projects the angle sensor reference line 24 a onto the screen 2. . Here, it is preferable to set both reference lines to be projected when the user instructs angle adjustment, and to set both reference lines to be projected when the power is turned on. May be.

  The angle sensor reference line generation circuit 24 acquires inclination detection data. When the inclination with respect to the gravitational field becomes 0 degree (horizontal with respect to the ground), the angle sensor reference line 24a and the panel reference line (OSD reference line 25a) are obtained. The angle sensor reference line 24a is drawn and projected so as to overlap. If there is an inclination, the angle sensor reference line 24a is drawn by shifting in the direction opposite to the inclination angle. At this time, correct installation can be easily performed by adjusting the angle of the apparatus so that the OSD reference line 25a and the angle sensor reference line 24a overlap. For example, if the inclination is shifted 30 ° to the left (left-right angle α = 30 °), the angle sensor reference line 24a is drawn to the right 30 °, and if the right is 10 ° (left-right angle α = −10 °), the left 10 An angle sensor reference line 24a is drawn, and when it is 5 ° (vertical angle β = 5 °) forward, an angle sensor reference line 24a shifted by 5 ° is drawn downward, and 5 ° (vertical angle β = − 5 °), the angle sensor reference line 24a shifted by 5 ° downward is drawn, and the angle sensor reference line 24a of 0 ° is drawn at an inclination of 0 ° (left and right angle α, up and down angle = 0 °). When it overlaps and overlaps the 0 ° line (OSD reference line 25a), the adjustment is completed.

  At this time, the OSD data synthesizing circuit 26 synthesizes the data of both the angle sensor reference line generation circuit 24 and the OSD reference line generation circuit 25 and projects the combined data on the projection unit 11 to display on the screen. Here, in practice, if there is a circuit for creating and displaying a simple OSD, it is common to draw and display both with software. In the OSD data synthesis circuit 26, when the data of FIG. 4A and the data of FIG. 4B are synthesized, the image of FIG. 5A is projected, and the data of FIG. When the data of C) are combined, the image of FIG. 5B is projected. At this time, since the projector is tilted, in reality, the projected image looks tilted as shown in FIG. When the image looks like FIG. 5A, the vertical angle adjustment adjuster 22 is adjusted, and the height is adjusted until the image looks like FIG. Further, if the image looks like FIG. 5B (actually FIG. 5C), adjust the left / right angle adjuster 23 until the image looks like FIG. 4A. Do. 4 and 5 are projection screens reflected on the screen 2, and adjustment can be performed reliably while viewing the screen.

  The matching process of the two reference lines in a state where the projector is tilted in the vertical direction and the horizontal direction, first, as shown in FIG. 6A, the OSD reference line 25a and the OSD reference line 25a are displayed on the OSD display screen before adjustment. The angle sensor reference line 24a is in a separated state, and the projector is not horizontal. Next, when only the right and left inclinations are adjusted, the front and rear inclinations (up and down inclinations) are not adjusted as shown in FIG. 6B. After that, when the front and rear inclinations are also adjusted, FIG. As shown in (C), the OSD reference line 25a and the angle sensor reference line 24a are completely matched, and the adjustment is completed.

  7 and 8 are diagrams for explaining correction of image tilt in the projection type image display apparatus shown in FIGS. 1 and 2, FIG. 7 shows a state before correction, and FIG. 8 shows a state after correction. Shows the state. Here, FIG. 7 is a diagram for explaining a state before image distortion adjustment when a multi-screen is configured using a plurality of projection type image display apparatuses according to the present invention, and FIG. 7D shows a state in which the OSD reference line and the angle sensor reference line are deviated in the display before adjustment when a multi-screen of 3 screens is configured, and FIG. 7B shows a case of configuring a multi-screen of 3 × 3 9 screens In the display before the adjustment, the OSD reference line and the angle sensor reference line are shifted. FIG. 8 is a diagram for explaining a state in which image distortion adjustment has been completed from the state of FIG. 7, and FIG. 8A illustrates the adjustment of the multi-screen of three horizontal screens from the state of FIG. 7A. 8D shows a state in which the OSD reference line and the angle sensor reference line coincide with each other, and FIG. 8B shows a state in which the adjustment of the 3 × 3 9-screen multi-screen is completed from the state of FIG. 7B. Indicates that the OSD reference line and the angle sensor reference line coincide with each other. In the figure, 2a, 2b, and 2c are areas to be projected on the screen in each projection type image display device, 24a, 24b, and 24c are angle sensor reference lines, and 25a, 25b, and 25c are OSD reference lines.

  When the installation adjustment is performed only with the projection image as in the prior art, there may be a case where a slight deviation actually occurs as shown in FIGS. Yes, it may cause distortion of the projected image. However, by making adjustments by applying the present invention, each unit can be easily installed parallel to the ground, and as illustrated in FIGS. 7A and 7B in the stage before adjustment. In each projector, the OSD reference lines 25a, 25b, and 25c and the angle sensor reference lines 24a, 24b, and 24c are normally shifted, but as illustrated in FIGS. 8A and 8B, Installation adjustment can be performed so that they match and are accurately projected onto the areas 2a, 2b, and 2c to be projected on the screen.

  As described above, the present invention is used as an auxiliary function for installing the projector in front of the screen and does not correct the projection image. Therefore, the projection image is not corrected as in the prior art. Can be used with image quality. That is, according to the present invention, since no correction is applied to the projected image, image quality degradation does not occur. As described above, according to the present invention, it is possible to accurately correct the inclination of the projection screen of the projection type image display device without deterioration of the image quality. Therefore, the projection screen is also distorted by the projection type image display device. Thus, it is possible to correct accurately without degrading the image quality. Furthermore, the present invention is easy to operate. In addition, when setting up a projector or stacking with multiple projectors or setting up multiple screens, when installing the projector, the physical position (tilt) of the set with respect to the screen is eliminated, and there is no variation in the tilt of the projection screen between sets. Projection in a simple state is possible.

It is the schematic which shows the structural example of the projection type image display apparatus which concerns on one Embodiment of this invention. It is a functional block diagram of the principal part in the projection type image display apparatus of FIG. It is a figure for demonstrating the method of expressing the attitude | position of the acceleration sensor attached to the object. It is a figure for demonstrating the OSD reference line and angle sensor reference line which are projected in the projection type image display apparatus shown in FIG.1 and FIG.2, and those matching processes. It is a figure for demonstrating the OSD reference line and angle sensor reference line which are projected in the projection type image display apparatus shown in FIG.1 and FIG.2, and those matching processes. It is a figure for demonstrating the OSD reference line and angle sensor reference line which are projected in the projection type image display apparatus shown in FIG.1 and FIG.2, and those matching processes. It is a figure for demonstrating correction | amendment of the image inclination in the projection type image display apparatus shown in FIG.1 and FIG.2, and is a figure which shows the state before correction | amendment. It is a figure for demonstrating correction | amendment of the image inclination in the projection type image display apparatus shown in FIG.1 and FIG.2, and is a figure which shows the state after correction | amendment. It is a figure for demonstrating correction | amendment of the image inclination in the projection type image display apparatus of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Projection type image display apparatus (projector), 2 ... Screen, 2a, 2b, 2c ... Area to be projected on screen 10 ... Projection type image display apparatus main body (housing), 11 ... Projection part, 21 ... Angle sensor, 22 ... adjuster for adjusting vertical angle, 23 ... adjuster for adjusting right / left angle, 24 ... angle sensor reference line generating circuit, 24a, 24b, 24c ... angle sensor reference line, 25 ... OSD reference line generating circuit, 25a, 25b , 25c... OSD reference line, 26... OSD data synthesis circuit, α.

Claims (6)

  A projection type image display apparatus comprising an inclination correction means for correcting an inclination of a projection image, wherein the inclination correction means includes an inclination detection means for detecting an inclination of the projection type image display apparatus with respect to a gravitational field, By projecting the fixed line fixed to the projection type image display device and the correction line corresponding to the tilt detected by the tilt detection unit onto the screen, the upper, lower, left, and right sides of the projection type image display device can be projected. A projection-type image display device characterized in that an installation angle can be adjusted.   Light modulation means that emits light from a light source and emits an optical image modulated based on an image signal, image projection means that projects an optical image emitted from the light modulation means, and projection by the image projection means And a tilt correction unit that corrects the tilt of the projected image, wherein the tilt correction unit uses the image projection unit to fix a fixed line fixed to the projection type image display device. Fixed line projecting means for projecting, tilt detecting means for detecting the tilt of the projection type image display apparatus with respect to the gravitational field, and correction for projecting a correction line according to the tilt detected by the tilt detecting means by the image projecting means Line projection means, and by allowing the fixed line and the correction line to overlap and project on the screen, the vertical and horizontal installation angles of the projection type image display device can be adjusted. Projection type image display device comprising.   The correction line projecting unit is a unit that generates an image signal for projecting the correction line by the image projecting unit based on a tilt detection signal in the tilt detecting unit and outputs the image signal to the light modulating unit. The projection type image display device according to claim 2, wherein   4. The projection type image according to claim 2, wherein the fixed line projecting unit is a unit that outputs an image signal for projecting the fixed line by the image projecting unit to the light modulating unit. Display device.   5. The projection type image display device according to claim 1, wherein the inclination correction unit has an adjuster for adjusting the installation angle at a bottom portion of the projection type image display device.   The projection type image display device according to claim 1, wherein the tilt detection unit is a unit that detects a tilt of the projection lens with respect to a gravitational field in the projection type image display device.

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