JPH0354592A - Projection type display device - Google Patents

Abstract

PURPOSE:To obtain a projection type display device which can optionally change the aspect ratio of an image on a screen by taking a cylindrical lens element having power which is different in a horizontal direction and in a vertical direction as an enlarging and projecting lens. CONSTITUTION:Light emitted from a light source 5 passes a light valve 4 as the nearly collimated beam of light and is projected to be formed into the image on the screen 1 through a vertical condensing cylindrical lens 3 and a horizontal condensing cylindrical lens 2. The enlargement ratio of the cylindrical lens 3 which is close to the light valve 4 is large and that of the cylindrical lens 2 which is distant from the light valve 4 is small. Therefore, the aspect ratio of the image on the light valve 4 and the screen 1 is changed, and a design in which the image resolution in the horizontal direction and the vertical direction is optionally changed is accomplished.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a projection type display device for displaying video images, computer graphics images, etc.

[Prior Art] A conventional projection display device uses a projection lens that is a combination of spherical lenses.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional technology, since the projection is simply enlarged, the screen shapes are similar. This imposes the restriction that the light valve must maintain the aspect ratio of the reduced size of the screen shape.Therefore, there are restrictions on the number of parts to be removed from the base material for making light pulp, and There are problems in that excess material is generated, making it impossible to take out material efficiently, resulting in a relatively high price, and that the aperture ratio decreases due to the requirement for vertical and horizontal resolution.

So. The present invention is intended to solve these problems, and its purpose is to make it possible to create a light valve with any aspect ratio of the liquid crystal panel, regardless of the aspect ratio of the screen, and to use the base material effectively. The purpose of the present invention is to provide a projection type display device that can be used for various purposes, that allows fine vertical and horizontal resolution in the desired direction, and that allows the aspect ratio of the screen to be arbitrarily changed.

[Means for Solving the Problems] The projection type display device of the present invention includes a light valve that modulates the intensity of light emitted from a light source, and a lens that magnifies and projects the light that has passed through the light valve onto a screen. The display device is characterized in that the magnifying projection lens is composed of cylindrical lens elements having different powers in the horizontal and vertical directions.

[Example] Fig. 1 is a three-dimensional perspective view of an example of the present invention, in which the light emitted from the light source 5 passes through the light pulp (LOLV>4) as approximately a thousand line rays, and the light passes through the vertical condensing cylindrical. The positional relationship is such that the image is projected onto the screen 1 after passing through the lens 3 and the horizontal condensing cylindrical lens 2.In other words, with respect to each cylindrical lens, the light bulb 4 and the screen are placed in a conjugate imaging position. This means that the horizontal and vertical magnification ratios are different, and both components of light are focused on the screen. are shown in Fig. 2 α and h. Fig. 2 1 α shows a vertical cross section of the projection optical system, and Fig. 2 1 b shows a horizontal cross section of the projection optical system. The cylindrical lens has a large magnification ratio, and the cylindrical lens, which is far from the light valve, has a smaller magnification ratio than the former.Thus, the aspect ratio of the light pulp and the screen on the screen can be changed.Horizontal and vertical It goes without saying that by changing the position of the cylindrical lenses and changing the distance, you can not only make it vertically or horizontally long, but also freely set the ratio.

[Effects of the Invention] As described above, the projection lens is composed of cylindrical lens elements having different powers in the horizontal and vertical directions, and the aspect ratio of the light valve and the aspect ratio of the image on the screen can be made different. According to
It is now possible to design the resolution in the horizontal and vertical directions to be arbitrarily changed, and by arbitrarily changing the external size of the light pulp, the base material area can be effectively utilized and the aperture ratio of the light valve can be increased. It has the effect of improving the performance, increasing the number of pieces by allocating more, and lowering the price per piece.

[Brief explanation of drawings]

FIG. 1 is a three-dimensional perspective view showing an embodiment of the projection display device of the present invention. FIG. 2(α) is a vertical sectional view showing an embodiment of the projection display device of the present invention. FIG. 2(b) is a horizontal sectional view showing an embodiment of the projection display device of the present invention. FIG. 3 is a main cross-sectional view 31 of a conventional projection display device.
... Screen 3, 31 ... Cylindrical lens 34 ...
...Light bulb (LOLV) 35...Light
Source: 1. Ball drunken lens or higher

Claims (1)

[Claims] In a projection display device that includes a light valve that modulates the intensity of light emitted from a light source and a lens that magnifies and projects the light that has passed through the light valve onto a screen, the magnifying projection lens has different powers in the horizontal and vertical directions. A projection type display device comprising a cylindrical lens element having a cylindrical lens element.