JPH06334949A - Liquid crystal projector - Google Patents

Abstract

PURPOSE:To optionally and continuously set up an aspect ratio by simple structure and to synthesize a magnified picture by providing this liquid crystal projector with 1st and 2nd reflecting mirrors for fully reflecting respective pictures outputted from 1st and 2nd picture output devices and a projection lens for projecting the pictures reflected by the 1st and 2nd reflecting mirrors as magnified pictures. CONSTITUTION:The rotational axes of the 1st and 2nd reflectors 25, 29 are set up so as to be vertical to a projection optical axis 28 and coincident with the longitudinal direction of a picture and a driving part sets up the angle 24 formed between the reflecting mirrors 25, 29 to 100 deg. so as to equally open the reflectors 25, 29 with respect to the center of the optical axis 28 by 50 deg.. Consequently, the 1st and 2nd pictures supplied to the lens 26 become transversely long pictures uniformly expanded in the transverse direction without generating distortion. Thereby a magnified synthetic picture magnified by the lens 26 and projected on a screen 27 becomes transversely superlong display. When the angle 24 formed between the two reflectors 25, 29 is set up to 60, e.g. smaller than 90 deg. so as to equally open the reflectors 25, 29 by 30 deg., a transversely short picture compressed in the transverse direction is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal projector for continuously and freely setting the aspect ratio of a composite image for projection.

[0002]

2. Description of the Related Art Conventionally, a first projection is composed of a light source for a first image, a liquid crystal panel, and a projection lens for enlarging and projecting light transmitted through the liquid crystal panel, as one for enlarging and projecting a plurality of images. A system, a second projection system of similar construction for the second image, and a third projection system of similar construction for the third image,
The device for synthesizing the first image, the second image, the third image, and the like on the screen is disclosed in, for example, Japanese Patent Publication (1-68740). Its purpose is
It was mainly to obtain a bright image that was enlarged and projected without changing the aspect ratio of the original image by compositing a plurality of images so as to be superimposed on the screen. Therefore, when it is desired to change the aspect ratio of the display image, for example, it is necessary to provide several kinds of cylindrical lenses or the like having different enlargement ratios immediately in front of the projection lens and appropriately switch them to obtain a desired aspect ratio. Therefore, in addition to the need for the first and second projection systems, it is necessary to provide a plurality of cylindrical lenses or the like that are installed so as to magnify with directionality, for example, to magnify only the vertical direction. There was a problem that the price increased as the size increased. Further, in this example, only the aspect ratios that are scattered are obtained depending on the number of cylindrical lenses that are installed.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a liquid crystal projector which has a simple structure and which can continuously and freely set an aspest ratio to synthesize an enlarged image. And

[0004]

In order to achieve the above object, a first image output device including a light source and a liquid crystal panel, a second image output device including a light source and a liquid crystal panel, and the first image. A first reflecting mirror that totally reflects the image output by the output device, a second reflecting mirror that totally reflects the image output by the second image output device, the first reflecting mirror and the second reflecting mirror The projection lens magnifies and projects the image reflected by the mirror.

[0005]

With the above structure, the reflecting mirror is installed so that the rotation axis direction thereof is perpendicular to the projection optical axis and the longitudinal direction of the image, and the angle between the two reflecting mirrors is larger than 90 °. For example, when the angle is set to 100 ° and the projection optical axis is set as the center, the angles are set to be equally opened by 50 °.
The first and second images supplied to the projection lens are horizontally long images that are uniformly stretched in the horizontal direction without distortion. On the contrary, when the angle between the two reflecting mirrors is set to an angle smaller than 90 °, for example, 60 ° and the apertures are set to be equally opened by 30 °, the first and second images supplied to the projection lens are laterally arranged. The image becomes a horizontal and short image with the direction uniformly contracted without distortion. Further, if the rotation axis direction of the reflecting mirror is installed so as to be perpendicular to the projection optical axis and in the horizontal direction of the image, the length of the image in the vertical direction can be freely and continuously controlled.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquid crystal projector according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of a liquid crystal projector according to the present invention. A light source 1 illuminates the liquid crystal panel 2. Reference numeral 2 is a liquid crystal panel that outputs an original image. Reference numeral 8 is a first image output device including the light source 1 and the liquid crystal panel 2. Reference numeral 9 is a second image output device. Reference numeral 3 denotes a first reflecting mirror that totally reflects the image output by the first image output device 8. Reference numeral 4 denotes a second reflecting mirror that totally reflects the image output by the second image output device 9. A projection lens 5 magnifies and projects the image reflected by the first reflecting mirror and the second reflecting mirror.
Reference numeral 6 is a drive unit that moves the first reflecting mirror 3 and the first reflecting mirror 4 around the rotation axis so that the included angle becomes a required angle.

The operation of the liquid crystal projector according to the present invention will be described. FIG. 2 shows an embodiment of a liquid crystal projector according to the present invention. Reference numeral 20 is a parabolic mirror having a parabolic cross section in which a light source lamp 21 is installed at a focal position. Reference numerals 22 and 23 denote a first liquid crystal panel and a second liquid crystal panel which display an original image. Reference numerals 25 and 29 denote a first reflecting mirror and a second reflecting mirror, which are plane mirrors that rotate about a rotation axis perpendicular to the projection optical axis 28. For example, the first reflecting mirror 25 and the second reflecting mirror 2
In a state where the rotation axis of 9 is installed so as to match the vertical axis of the original image, the drive unit 6 is set so that the included angle 24 of the reflecting mirror is set to 100 ° and the projection optical axis 28 is equally opened by 50 °. Then, the first and second images supplied to the projection lens 26 become horizontally long images that are uniformly stretched in the horizontal direction without distortion. Therefore, it is enlarged and projected by the projection lens 26,
The enlarged composite image projected on the screen 27 is shown in FIG.
As shown in (a), a horizontally long display is obtained in which the first enlarged image (A) and the second enlarged image (B) are combined so as to be adjacent to each other.

It should be noted that four image output devices from the first image output device to the fourth image output device are arranged at predetermined positions, for example,
The two image output devices described in the above-mentioned two screen display examples are installed in a structure in which two stages are vertically combined, and the respective output images are set to a required angle from the first reflecting mirror to the fourth reflecting mirror. Alternatively, the liquid crystal projector for four-screen enlarged display shown in FIG. 3B may be configured by projecting each reflected image with a projection lens. Further, the content of the display image may be such that each screen is independent by performing a predetermined process of displaying the original image on each liquid crystal panel, and each screen is combined to display one type of program. May be. Further, by finely adjusting the angle of the reflecting mirror, the connection between the screens can be completely eliminated.

FIG. 4 is a table for explaining the relationship between the included angle of the liquid crystal projector according to the present invention and the display vertical ratio of the screen. For example, if the included angle is set to 90 °,
The vertical / horizontal ratio of the display screen (A + B) of (a) is 3: 8. Since the included angle can be set to any continuous angle, the aspect ratio of the enlarged image can be any continuous aspect ratio.

[0010]

As described above, the present invention provides a liquid crystal projector capable of synthesizing enlarged images by setting the aspect ratio in a freely continuous state with a simple structure. Therefore, an image can be enlarged and displayed in a 4: 3 screen without being distorted, for example, in a 4: 3 screen without throwing away a part of a high-definition or movie Vista-sized source, which is highly useful.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a liquid crystal projector according to the present invention.

FIG. 2 is an embodiment of a liquid crystal projector according to the present invention.

FIG. 3 is an enlarged screen display example of the liquid crystal projector according to the present invention.

FIG. 4 is a table for explaining the relationship between the included angle of the liquid crystal projector according to the present invention and the vertical ratio of display on the screen.

[Explanation of symbols]

 1 light source 2 liquid crystal panel 3 first reflecting mirror 4 second reflecting mirror 5 projection lens 6 driving unit 8 first image output device 9 second image output device 20 parabolic mirror 21 light source lamp 22 first liquid crystal Panel 23 second liquid crystal panel 24 included angle 25 first reflecting mirror 26 projection lens 27 screen 28 projection optical axis 29 second reflecting mirror

Claims (3)

[Claims] 1. A first image output device composed of a light source and a liquid crystal panel, a second image output device composed of a light source and a liquid crystal panel, and a first device which totally reflects an image output by the first image output device. Reflection mirror, a second reflection mirror that totally reflects the image output by the second image output device, and a projection lens that magnifies and projects the image reflected by the first reflection mirror and the second reflection mirror. The liquid crystal projector is characterized by synthesizing display images to be enlarged and projected with a required aspect ratio. 2. The liquid crystal projector according to claim 1, wherein an included angle formed by the first reflecting mirror and the second reflecting mirror can be set to a predetermined angle. 3. A first image output device including a light source and a liquid crystal panel, a second image output device including a light source and a liquid crystal panel, a third image output device including a light source and a liquid crystal panel, a light source and a liquid crystal. A fourth image output device formed of a panel, a first reflecting mirror that totally reflects an image output by the first image output device, and a second reflective mirror that totally reflects an image output by the second image output device. A reflecting mirror, a third reflecting mirror that totally reflects an image output by the third image output device, a fourth reflecting mirror that totally reflects an image output by the fourth image output device, and Consists of a projection lens that magnifies and projects the image reflected by the first reflecting mirror, the second reflecting mirror, the third reflecting mirror, and the fourth reflecting mirror, and combines the display image to be magnified and projected with the required aspect ratio. A liquid crystal projector characterized by: