JPH0741519U - Display device - Google Patents

Abstract

(57) [Summary] [Object] To provide a configuration in a projection type display device in which a size of an image to be projected can be changed to either a horizontally long size or a vertically long size. A convex mirror 6 curved in one axis direction is arranged between a projector P including a light source, a transmissive image display, and a magnifying lens and a screen 5, and the convex mirror 6 reflects the convex mirror 6 to form an image on the screen. To project a horizontally long image or a vertically long image.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a display device for enlarging and displaying an image of a transmissive liquid crystal display device on a screen, for example.

[0002]

[Prior art]

FIG. 3 shows a schematic structure of a conventional projection display device. In the figure, P indicates a projector for enlarging and projecting an image. As is well known, the projector P includes a light source 1, a transmissive image display 2 such as a black and white liquid crystal display or a color liquid crystal display, and a magnifying lens 3. The light emitted from the projector P is bent by 90 ° by the reflecting mirror 4 as necessary and enlarged and projected on the screen 5. In FIG. 3, L ₁ indicates the video range of the image.

[0003]

[Problems to be solved by the device]

 According to the conventional structure, the aspect ratio of the image projected on the screen 5 is determined by the aspect ratio of the image of the transmissive image display 2 and cannot be changed. An object of the present invention is to provide a display device capable of projecting by changing the aspect ratio of an image projected on a screen to a size different from the aspect ratio of the original image.

[0004]

[Means for Solving the Problems]

 In this invention, in a display device having a structure in which light from a light source is transmitted through a transmissive image display and is magnified and projected on a screen by a magnifying lens, a convex mirror curved in one axis is arranged between the magnifying lens and the screen. However, the structure is such that an image is projected on the screen through this convex mirror.

[0005]

[Action]

 According to the structure of this invention, the image is stretched in the curved direction of the convex mirror and projected on the screen. As a result, a horizontally long image or a vertically long image can be projected smoothly, and the image can be viewed at a desired image size.

[0006]

【Example】

 FIG. 1 shows an embodiment of a display device according to the present invention. In the figure, P indicates a projector. The projector P is composed of the light source 1, the transmissive image display 2, and the magnifying lens 3, and the point that the light emitted from the projector P is projected on the screen 5 to display an image is the same as the description of FIG. Is.

In this invention, a convex mirror 6 curved in one axis direction is arranged between the magnifying lens 3 and the screen 5, and the convex mirror 6 reflects the convex mirror 6 to project it on the screen 5. Depending on whether the curvature of the convex mirror 6 is taken in the horizontal direction (horizontal direction) or in the vertical direction (vertical direction), the size of the image projected on the screen 5 can be selected to be horizontal or vertical. You can

L shown in the figure₂Indicates the image range on the side extended by the convex mirror 6. This video range L ₂ Is the image range L shown in FIG.₁Compared to L₂> L₁It becomes a relationship. Assuming that the curved direction of the convex mirror 6 is taken in the horizontal direction in FIG. Light is emitted from the horizontal direction, and the reflected light is reflected on the screen 5. With this arrangement, a horizontally long image is displayed on the screen 5.

On the other hand, when the curved direction of the convex mirror 6 is taken as the vertical direction in FIG. 1, the projector P is arranged, for example, on the lower side of the convex mirror 6, and an image is projected from the lower side of the convex mirror 6 in the vertical direction. It is bent by 90 ° and reflected to project it on the screen 5. In this case, a vertically long image is displayed on the screen 5. FIG. 2 shows another embodiment of this invention. In this example, the screen 5 is curved in accordance with the curvature of the convex mirror 6, and the optical path lengths are made equal at any part to be focused.

[0010]

[Effect of device]

 As described above, according to the present invention, the image projected on the screen 5 can be freely changed to a horizontally long size or a vertically long size with a simple structure. Therefore, the aspect ratio of the image can be selected according to the taste and the content of the image, and a display device having a high degree of freedom can be provided.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing another embodiment of the present invention.

FIG. 3 is a diagram for explaining a conventional technique.

[Explanation of symbols]

 1 light source 2 transmissive image display 3 magnifying lens 5 screen 6 convex mirror P projector

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Claims (6)

[Scope of utility model registration request] 1. A display device having a structure in which light from a light source transmits an image of a transmissive image display device and projects the image on a screen through a magnifying lens, wherein the magnifying lens and the screen are curved in one axis direction. A display device, characterized in that a convex mirror is arranged, and an image is projected on a screen through the convex mirror to change the aspect ratio of the projected image. 2. The display device according to claim 1, wherein the transmissive image display device is a monochrome liquid crystal display device. 3. The display device according to claim 1, wherein the transmissive image display is a color liquid crystal display. 4. The display device according to claim 1, wherein the screen has a structure in which the screen is curved in accordance with the curvature of a convex mirror to focus the screen. 5. A display device having a structure in which the convex mirror is bent in the horizontal direction, and an image projected on a screen is changed to a horizontally long size and displayed. 6. A display device having a structure in which the convex mirror is curved in the vertical direction, and an image projected on a screen is displayed in a vertically long size.