JP2000171897A - Liquid crystal projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal projector which allows the free regulation of the screen size of projected images even when an installation place is limited and allows the easy regulation of various kinds accompanying installation. SOLUTION: The liquid crystal projector 1 is provided with an optical system reflection means 6 for freely changing the projection direction of the projection lens on the exit side of the projection lens 5. A mirror section 6 as the optical system reflection means is constituted by mounting a mirror 6a for reflecting the projecting light of the projection lens 5 at the mounting member of, for example, a hemispherical shape and rotatably mounting the mirror via a revolving shaft 7 to a mirror section supporting shaft 8. The mirror section supporting shaft 8 is freely elongatably and contractably constituted by using plural members 8a, 8b, 8c and is mounted rotatably around the projection lens 5 to the upper part of the projector body 2. As a result, even if the installation point is limited, the regulation of the screen size of the projected image and the regulation of the height of the screen may be freely carried out simply by adjusting the length of the mirror section supporting shaft 8. Even if the body 2 is inclined by the angle regulation of the mirror section 6, the regulation of various kinds, accompanying the installation, such as projection of the distortion-free projected image, may be easily carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front-projection type liquid crystal projector, and more particularly, to the height of the screen by providing an optical system reflecting means capable of freely changing the projection direction on the exit side of a projection lens. The present invention relates to a liquid crystal projector that can easily perform adjustment, direction adjustment, size adjustment, and the like.

[0002]

2. Description of the Related Art In recent years, a liquid crystal projector using a liquid crystal panel has been actively developed with a demand for a small-sized and lightweight display device having a large screen. Liquid crystal projectors are also expected to be used for high-definition televisions because they can easily be made larger.

[0003] Among them, a front projection type liquid crystal projector is small and lightweight, and can be easily installed and used.
In addition, since it is not so expensive in terms of cost, it is popular with users in recent years and widely used, and demand for the future is sufficiently expected.

Generally, in a liquid crystal projector, a processing circuit provided inside a main body performs processing required for displaying a video based on the video signal on a display surface of a liquid crystal display panel on a video signal of a video source to be displayed. As a result, a panel drive signal corresponding to the input video signal is obtained, and the panel drive signal is supplied to the liquid crystal display panel, so that a video screen based on the input video signal is displayed on the display surface of the liquid crystal display panel. Is done. At this time, visible light emitted from a light source using a reflector or the like is transmitted through the display surface of the liquid crystal display panel, and transmitted light of the transmitted liquid crystal display panel is
It is narrowed down by a condenser lens or the like, and is enlarged and projected by a projection lens, so that the image is enlarged and displayed on a screen. As a result, a video screen displayed on the liquid crystal display panel can be displayed on the screen.

By the way, the front projection type liquid crystal projector can freely change the size of the image screen by changing the distance from the set position to the screen, that is, the projection distance. It is very convenient for

However, in consideration of such a place where the liquid crystal projector is installed, no matter how small and light, the installation place is limited, for example, in an existing room, that is, the projection distance is inevitably determined. Therefore, the size of the projection screen cannot be freely adjusted.

When a liquid crystal projector is installed,
It is necessary to adjust the height of the liquid crystal projector according to the height of the screen, but in the case of such height adjustment, it is necessary to adjust the height using a table for mounting the projector body. .

As described above, in the conventional liquid crystal projector, not only the inconvenience that the screen size cannot be freely adjusted according to the installation location, but also the height adjustment and the direction adjustment of the main body accompanying the installation can be easily performed. There was also the inconvenience of not being able to.

[0009]

As described above, in the conventional liquid crystal projector, since the installation place of the liquid crystal projector is usually limited in the existing room, the size of the projection screen is changed according to the change of the projection distance. When adjustment cannot be performed and the height is adjusted to obtain a normal projection screen, use a stand for mounting the projector body, etc. according to the screen height. In other words, there is a problem that it is not easy to perform various adjustments such as height adjustment and direction adjustment accompanying the installation of the liquid crystal projector.

In view of the above, the present invention has been made in view of the above-mentioned problems, and it is possible to freely adjust the screen size of a projected image even when installation locations are limited, and to easily perform various adjustments accompanying installation. It is an object of the present invention to provide a liquid crystal projector that can perform the operation.

[0011]

According to a first aspect of the present invention, there is provided a liquid crystal projector that projects an image formed on a liquid crystal display panel surface based on an input video signal by irradiation light from a light source, and projects the projected image. In a liquid crystal projector that enlarges and displays light on a screen via optical system means,
An optical system reflection that reflects the projection image light from the projection lens and freely changes the distance to the projection lens and the angle of the projection lens with respect to the optical axis on the emission side of the projection lens as the optical system means. Means for adjusting the height and size of the projection screen by changing the distance from the projection lens or projecting by changing the angle of the projection lens with the optical axis. It is characterized in that the projection direction can be freely changed so as to adjust the height of the screen and perform front projection without reflection by the optical system reflection means.

According to the present invention, in the above-mentioned liquid crystal projector, the projection image light from the projection lens is reflected on the emission side of the projection lens as the optical system means, the distance from the projection lens, and the distance of the projection lens. By providing an optical system reflecting means that can freely change the angle with respect to the optical axis, the height and size of the projection screen are adjusted by changing the distance from the projection lens, or the optical axis of the projection lens. The projection direction can be freely changed so that the height of the projection screen is adjusted and the front projection without reflection by the optical system reflection means is performed by changing the angle of the projection screen. Thereby, even when the installation location is limited, the screen size of the projected image can be freely adjusted, and various adjustments accompanying the installation can be easily performed. A liquid crystal projector according to a second aspect of the present invention is the liquid crystal projector according to the first aspect, wherein the optical system means is rotatably provided at an upper portion of the liquid crystal projector main body through a center of a projection lens provided at an upper portion of the liquid crystal projector main body. It is attached, and the projection direction is changed by rotating the optical system reflection means, and the projection screen is rotated.

According to this invention, in addition to the operation similar to the first aspect of the present invention, by rotating the optical system reflection means, the projection direction with respect to the horizontal direction can be freely changed, and the projection screen can be displayed. It can be rotated in any direction. As a result, the viewing range can be expanded, and a high-performance liquid crystal projector that does not limit installation locations can be realized.

According to a third aspect of the present invention, in the liquid crystal projector according to the first or second aspect, the optical system reflecting means includes a mirror for reflecting the projected image light, and a mirror. It is characterized by comprising a mounting member for mounting, and a supporting shaft member capable of freely adjusting the length while mounting the mounting member on the liquid crystal projector main body.

According to the present invention, the operations and effects in the first and second aspects of the invention are the same.

[0016]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a liquid crystal projector according to an embodiment of the present invention, and is a configuration diagram showing a schematic configuration of the entire apparatus.

In this embodiment, an optical system reflecting means is provided on the emission side of the projection lens of the liquid crystal projector, the distance between the projection lens and the projection lens being freely variable and the angle can be adjusted freely. By doing so, the above object is achieved.

As a specific overall configuration, as shown in FIG. 1, a liquid crystal projector 1 of the present embodiment is mounted on a projector body 2 and inside the projector body.
A light source 3 including a lamp 3a, a reflector 3b, and the like;
A liquid crystal display panel 4 for taking in irradiation light from the light source 3 and irradiating image light of a formed image, and a projector for enlarging and projecting image light from the liquid crystal panel 4.
A projection lens 5 having a focus adjustment function in which a plurality of lenses are arranged in a lens barrel, and a mirror support shaft on the upper surface of the projector body 2 on the emission side where the projection lens 5 is arranged. It is mainly composed of an optical system reflecting means (also referred to as a mirror unit) 6 attached via an intermediary 8.

The light source 3 reflects the light emitted from the lamp 3a by the reflector 3b, and irradiates the reflected light onto the surface of the liquid crystal display panel 4.

The liquid crystal display panel 4 forms an image based on the video signal of the video source to be displayed on its display surface as described in the background art, and the light emitted from the light source 3 is applied to the surface of the liquid crystal display panel 4. The transmitted image light irradiates the projection lens 5 as an optical system means by transmitting the light through the upper side. In this case, the liquid crystal display panel 4 is required to display an image based on the input image signal on the display surface of the liquid crystal display panel by a processing circuit (not shown) provided inside the projector main body 2. By being processed,
By obtaining a panel drive signal corresponding to the input video signal and supplying the panel drive signal to the liquid crystal display panel, a video screen based on the input video signal is displayed on the display surface of the liquid crystal display panel.

The projection lens 5 is composed of a plurality of optical lenses as described above, and projects the transmitted image light from the liquid crystal display panel 4 in an enlarged manner. Also, this projection lens 5
A focus adjustment function for adjusting the focal length is provided, and when the projected image displayed by the enlarged projection is out of focus, the focus is adjusted using the focus adjustment function so that there is no focus shift. An optimal projection image can be obtained.

In this embodiment, there is provided an optical system reflecting means 6 for freely changing the projection direction of the projection light of the projection lens 5 by utilizing the reflection action of the optical system.

Mirror section 6 as this optical system reflecting means
Is configured by mounting, for example, a mirror 6a that reflects the projection light of the projection lens 5 on a hemispherical mounting member. The mirror unit 6 is attached to the mirror unit support shaft 8 so as to be freely rotatable about a rotation shaft 7. The mirror support shaft 8 is mounted on the upper surface of the projector main body 2 so as to be movable on the outer periphery of the projection lens 5. Further, the mirror portion support shaft 8 has a structure such that the length thereof can be freely expanded and contracted, that is, the height of the mirror portion 6 attached to the distal end portion can be freely adjusted. It has become.

FIG. 2 is an explanatory view for explaining the angle adjusting structure of the mirror section. The angle adjustment structure of the mirror unit 6 will be further described in detail with reference to FIG.

As shown in FIG. 2, the mirror 6 is pivoted about a rotation shaft 7 of a mirror support shaft 8, and the mirror 6a is connected to the lamp 3.
It is configured to be rotatable by about 90 ° or more from a point directed perpendicularly to an optical axis connecting a to the center of the projection lens 5 and to be able to be locked at an arbitrary angle. It is configured.

That is, by performing the fine angle adjustment by such an angle adjustment structure, even when the projector main body 2 and the screen (not shown) are inclined, it is possible to view a screen without distortion.

When the mirror unit 6 is set at 45.degree. With respect to the optical axis by using such an angle adjusting structure, as shown in FIG. 1, the projection light of the projection lens 6 is projected by the mirror 6a by the mirror 6a. The projection image can be reflected on a screen (not shown) provided with the main body 2 and projected. That is, front projection becomes possible.

Further, for example, the mirror section 6 is moved 9 degrees with respect to the optical axis.
If it is set to be rotated by 0 ° or more, although not shown, the projection light of the projection lens 6 is projected toward the ceiling without being reflected by the mirror 6a. The projected image can be projected on the provided screen. That is, ceiling projection becomes possible. However, in this case, since the left and right of the screen is inverted with respect to the front projection, for example, by performing a left and right inversion process on the input video signal using a processing circuit in the projector body 2 (not shown), there is no left and right inversion effect of the screen. A normal projection image is projected.

The liquid crystal projector 1 according to the present embodiment can also adjust the height of the projection screen. FIG. 3 is an explanatory diagram for explaining the height adjusting structure of the mirror section. The structure for adjusting the height of the mirror section will be further described in detail with reference to FIG.

The mirror support shaft 8 on which the mirror 6 is mounted is composed of a plurality of cylindrical shaft members 8a, 8b, 8c,... Having different ring diameters as shown in FIG. For example, when the shaft member 8a has the largest ring diameter and the certain member 8a
Is mounted on the upper surface of the projector body 2, a certain member 8b having a small ring diameter is slidably inserted into the certain member 8a, and the next ring slidably inserted into the certain member 8b. The rod member 8c having a small diameter is configured to be inserted. In the case where the mirror supporting shaft 8 is constituted by, for example, three certain members 8a, 8b, 8c as described above, the rotating shaft 7 is attached to the tip of the rod member 8a having the smallest ring diameter.
The mirror unit 6 is rotatably mounted via the. In this example, the case where three mirror members are used has been described. However, the present invention is not limited to this case. You may.

As described above, the plurality of certain members 8a, 8b, 8c
The mirror support shaft 8 composed of, for example, is adjusted by sliding, for example, so that the mirror
Can be adjusted in the vertical direction, and can be locked so that the height of the adjustment can be maintained.

For example, when the liquid crystal projector 1 according to the present embodiment is used for front projection, the above-mentioned mirror unit support shaft 8 is slid up and down to enlarge or reduce the screen size of the projected image and adjust the screen height. . This allows
It is possible to easily adjust the screen size of the projection image freely, such as enlargement or reduction, and it is possible to easily adjust the height of the mirror unit 6 optimally according to the screen (not shown).

The size of the mirror 6a needs to be configured so that the mirror portion 6 is moved to the uppermost position and the screen is not chipped when the angle is set to 45 °. In addition, the liquid crystal projector 1 according to the present embodiment
By configuring the mirror unit supporting shaft 8 to be movable near the outer periphery of the projection lens 5 to which the mirror unit support shaft 8 projects, the horizontal projection direction of the mirror unit 6 can be freely adjusted. The structure for adjusting the projection direction of the mirror support shaft 8 in the horizontal direction will be described in more detail with reference to FIG. FIG. 4 illustrates a structure for adjusting the horizontal projection direction of the mirror support shaft, and illustrates a mounting structure of the mirror support shaft as viewed from the upper surface of the projector main body.

As shown in FIG. 4, the projection lens 5 is disposed on the upper surface of the liquid crystal projector main body 2 as described above, and a mirror support shaft larger than the diameter of the projection lens 5 is provided near the outer periphery of the projection lens 5. A groove 10 is formed. The mirror supporting shaft 8 is inserted into the mirror supporting shaft groove 10, and the mounting state is maintained by a locking portion 9 (see FIG. 3) at the base end of the mirror supporting shaft 8. It has become. In other words, the mirror support shaft 8 is movably mounted while being guided by the mirror support shaft groove 10. Further, by the locking action of the locking portion 10 with the groove 10 for the mirror support shaft, the locked state can be maintained at an arbitrary position.

The mirror support shaft 8 and the locking portion 9 are
When the mirror support shaft 8 moves along the groove 10 for the mirror support shaft, the mirror portion 6 attached to the tip always acts so as to be positioned on the projection lens side.

With such a configuration, the mirror supporting shaft 8
Can be freely moved around the projection lens 5 along the mirror supporting shaft groove 10, and of course, it can be moved so as to make one round. Therefore, by rotating the mirror support shaft 8 or adjusting the angle, the projection direction can be freely changed and can be easily performed.

Next, the operation which is a feature of this embodiment will be described in detail with reference to FIG. Now, assume that the liquid crystal projector 1 is used. Then, the luminous flux of the lit lamp 3a is reflected by the reflector 3b and condensed on the effective surface of the liquid crystal display panel 4. Liquid crystal display panel 4
Forms an image based on the input video signal on its display surface, and the condensed irradiation light from the light source 3 is applied to the liquid crystal display panel 4.
The transmitted image light is captured by the projection lens 5 and is enlarged and projected on a screen (not shown) via the mirror 6a of the mirror unit 6. At this time, the mirror unit 6
Of the mirror 6a is 45 degrees with respect to the optical axis of the projection lens 5.
When set to °, a projected image can be projected on a screen (not shown) perpendicular to the optical axis without distortion. At this time, the back focus of the projection lens 5 is on the liquid crystal display surface.

Here, for example, it is assumed that the liquid crystal projector 1 is installed in a small room and the projection distance between the screen installed on the wall and the projector body 2 is short. Has a mirror 6
The mirror support shaft 8 is moved up and down while maintaining the angle of 45 °. Thereby, the screen size of the projection image can be freely changed.

For example, when the screen is installed on the upper part of the wall and the height of the projection screen from the liquid crystal projector 1 needs to be adjusted, the mirror section 6 is similarly set at 45 ° according to the height of the screen. The mirror unit support shaft 8 is moved up and down while maintaining the angle of (1). Thus, the height of the screen of the projection image can be adjusted optimally. Therefore, height adjustment can be performed without using a table or the like on which the projector main body is conventionally required.

Further, when the projector main body 2 is installed with a slight inclination, the projected image is distorted. In such a case, the angle of the mirror unit 6 may be finely adjusted via the rotation shaft 7. This makes it possible to project a projection image without distortion.

Further, in the case of projecting on a screen arranged on a wall or the like in the other direction in addition to the above-mentioned screen, the mirror supporting shaft 8 is optimally aligned with the mirror supporting shaft groove 10 of the projector main body 2. What is necessary is just to rotate so that it may become a projection direction. Thereby, the projection direction in the horizontal direction can be easily changed to the direction where the screen exists, and the projection screen can be rotated. That is, it is possible to provide an unconventional liquid crystal projector that can change the projection direction even in the horizontal direction in the installed state.

Therefore, according to the present embodiment, the screen size of the projected image can be freely adjusted even when the installation location is limited, and various adjustments such as height adjustment and angle adjustment accompanying the installation can be performed. Can be easily performed. As a result, the viewing range of the projected image can be expanded, and a high-performance liquid crystal projector that is not limited to the installation location can be realized.

In the embodiment according to the present invention, the mirror unit 6 disposed on the upper surface of the projector main body 2 is used.
Although the description has been given of the case where the liquid crystal projector is used in a state where it is arranged on the upper part of the main body, it is needless to say that the projector main body 2 can be used in a horizontal position as in the case of a normal front projection type liquid crystal projector. However, in this case, the mirror unit 6 is set to 9 so that the projection light of the projection lens 5 is not obstructed.
Needless to say, the image is rotated by 0 ° or more, and the left / right inversion processing is performed by the processing circuit.

[0044]

As described above, according to the present invention, the screen size of the projected image can be freely adjusted even when the installation location is limited, and various adjustments such as height adjustment accompanying the installation can be performed. , It is possible to realize the provision of a liquid crystal projector that can easily perform the liquid crystal projector.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a liquid crystal projector of the present invention, and showing a schematic configuration of the entire apparatus.

FIG. 2 is an explanatory diagram for explaining an angle adjusting structure of a mirror unit in FIG. 1;

FIG. 3 is an explanatory diagram for explaining a vertical height adjusting structure of a mirror unit in FIG. 1;

FIG. 4 is a top view of the projector main body for explaining a rotating structure of the mirror unit in FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Liquid crystal projector, 2 ... Projector main body, 3 ... Light source, 3a ... Lamp, 3b ... Reflector, 4 ... Liquid crystal display panel, 5 ... Projection lens, 6 ... Reflecting means (mirror part), 6
a: mirror, 7: rotating shaft, 8: mirror part supporting shaft.

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2H088 EA13 EA19 HA21 HA24 HA28 MA20 5C058 AA18 AB06 BA14 BA27 EA02 EA12 EA13 EA26 5C060 GA01 GB09 GB10 HC11 HC20 JA01 JB06 5G435 AA00 BB12 BB17 CC12 DD02 DD06 FF16GG01 LL15

Claims (3)

[Claims] 1. A liquid crystal for projecting an image formed on a liquid crystal display panel surface based on an input video signal by irradiation light from a light source and enlarging and displaying the projected image light on a screen via optical system means. In the projector, the projection image light from the projection lens is reflected on the emission side of the projection lens as the optical system means, and the distance to the projection lens and the angle of the projection lens with respect to the optical axis can be freely changed. An optical system reflecting unit is provided, and the optical system reflecting unit adjusts the height and size of the projection screen by changing the distance to the projection lens, or changes the angle of the projection lens with the optical axis. It is characterized in that it is possible to freely change the projection direction so as to perform height adjustment of the projection screen and front projection without reflection by the optical system reflection means. A liquid crystal projector that. 2. The optical system means is rotatably mounted on the upper part of the liquid crystal projector through a center of a projection lens on the upper part of the liquid crystal projector main body. 2. The liquid crystal projector according to claim 1, wherein the projection direction is changed and the projection screen is rotated. 3. The liquid crystal projector, further comprising: a mirror for reflecting the projection image light, a mounting member for mounting the mirror, and a mounting member mounted on the liquid crystal projector main body. 3. A liquid crystal projector according to claim 1, wherein said liquid crystal projector comprises a support shaft member which can be freely adjusted.