KR100303801B1 - rear projection typed LCD projection system - Google Patents

Abstract

The rear projection LCD projection system is designed to reduce the overall height of the system by reducing the space occupied by the optical engine. The present invention locates an optical engine comprising an illumination optical system including an LCD and a projection lens at the side of the screen and the vertical center line of the screen, so that the optical axis of the projection light projected from the optical engine is aligned with the horizontal center line of the screen. Configure. Thus, the present invention provides the effect of making it easier to mount in a general home and office by reducing the overall height of the system.

Description

Rear projection typed LCD projection system

The present invention relates to a rear projection LCD projection system, and more particularly, a rear projection LCD projection system in which an optical engine is positioned on the side of the screen and the vertical center line of the screen to reduce the overall height of the system. It is about.

A typical rear projection LCD projection system forms a configuration in which the illumination optical system, the LCD and the projection lens are located at the bottom of the cabinet. In addition, the rear projection type LCD projection system is configured such that the projection lens, the projection optical axis and the normal of the LCD surface coincide in a straight line.

The illumination optical system of the rear projection LCD projection system generally includes a color separation optical system for forming a lamp and a color for a light source, and a scrambler or fly-eye optical system for evening an illumination light distribution on the LCD. do. The color separation optical system is classified into one panel system or three panel system according to the number of panels to be used.

1A and 1B show side and front views of a typical rear projection LCD projection system.

As shown in Fig. 1, the rear projection LCD projection system projects an image from the LCD 12 and the LCD 12 which forms an image by the optical signal from the illumination optical system 11, the illumination optical system 11, and the like. A projection lens 13, a reflection mirror 14 for converting the projection light path by reflecting the projection light from the projection lens 13, a screen 15 for diffusing the projected image into a wide viewing range, and a cabinet surrounding the system. It is formed of (16).

The illumination optical system 11 includes a light source lamp 111, a scrambler or fly-eye optical system 112, and a color separation optical system 113.

In the rear projection type LCD projection system having such a configuration, the illumination optical system 11 illuminates the LCD 12 surface. The LCD 12 forms an image by the optical signal from the illumination optical system 11. This formed image is projected onto the projection lens 13 having an arbitrary focal length. This projected image is reflected by the reflection mirror 14 and imaged on the screen 15.

In the rear projection LCD projection system of FIG. 1, the optical engine, that is, the illumination optical system 11, the LCD 12, and the projection lens 13 are located at the lower end of the cabinet 16, so that the projection from the LCD 12 to the screen 15 is performed. The path of view is upward projection from bottom to top.

In addition, since the projection lens 13, the projection optical axis, and the normal line of the LCD 12 surface coincide with each other in a straight line, the system can accommodate a space from the first surface a of the projection lens to the illumination optical system 11. Secure (A).

However, due to such space, a large height is generated between the bottom surface of the screen 15 and the bottom surface of the cabinet 16, resulting in a height of the system. Because of the height of the system, it was inconvenient to mount such a system in a normal home or office. In other words, if you want to mount such a system in a normal home or office, if you want to place the system on the cabinet, the height of the system is too high, and if you want to place the system on the floor, there is a separate auxiliary support for adjusting the height of the system. Need.

Therefore, the rear projection type LCD projection system of the present invention is designed to solve the above problems, and has an object to reduce the overall height of the system by reducing the space occupied separately by the optical engine in the conventional rear projection type LCD projection system. .

1A-1B are side and front views of a conventional rear projection type LCD projection system,

2A-2C are a plan view, a front view and a side view showing a rear projection type LCD projection system according to the present invention.

<Description of the symbols for the main parts of the drawings>

21: illumination optical system 23: projection lens

24: reflection mirror 25: screen

26 cabinet

A rear projection type LCD projection system of the present invention for achieving the above object, the rear projection type LCD projection system, a screen for forming an image projected; A reflection mirror installed at an angle with the screen surface and reflecting the projection light toward the screen; And an optical engine positioned laterally behind the screen and with respect to the vertical center line of the screen, and projecting an image to be formed by the reflecting mirror, wherein the projection optical axis is parallel to the horizontal center line of the screen.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2A, 2B and 2C are a plan view, a front view and a side view of a rear projection type LCD projection system according to the present invention.

The rear projection type LCD projection system of FIG. 2 reflects an illumination optical system 21 including an LCD (not shown), a projection lens 23 for projecting an image from the LCD, and projection light from the projection lens 23. A reflection mirror 24 for converting the projection light path, a screen 25 for diffusing the projected image in a wide viewing range, and a cabinet 26 surrounding the system.

Since the operation of each component is the same as the operation of each component constituting the rear projection type LCD projection system of Figure 1 will not be described the detailed operation.

As shown in FIG. 2, the optical engine is disposed behind the screen 25 and on the left or right side with respect to the vertical center line c of the screen 25. In FIG. 2, the optical engine is disposed at the right side. As shown in FIG. 2A, the optical axis generated by the optical path projected onto the screen 25 is parallel to the horizontal center line of the screen 25.

In addition, as shown in the front view of FIG. 2B, the optical engine is disposed so that the optical axis formed between the first lens (a) and the second surface (b) of the projection lens coincides with the horizontal center line (d) of the screen. The projection optical axis formed from the surface a to the screen 25 coincides with the horizontal center line d of the screen 25. The reason why the projection optical axis from the projection lens first surface a to the screen 25 coincides with the horizontal center line d of the screen is because the reflecting mirror 24 has an angle with the screen 25. In other words, the projection image by the projection lens 24 is directed to the screen 25 accurately. By constructing the optical engine in this way, the space occupied by the conventional optical engine is reduced.

As described above, the rear projection type LCD projection system of the present invention has an advantage that it can be easily mounted in general homes and offices because it reduces the overall height of the system by reducing the space occupied by the optical engine.

Claims (3)

In the rear projection type LCD projection system, A screen for forming an image to be projected; A reflection mirror installed at an angle with the screen surface and reflecting the projection light toward the screen; And A rear projection LCD including an optical engine positioned behind the screen and on the side of the screen with the vertical center line, and projecting an image formed by the reflection mirror, wherein the projection optical axis is parallel to the horizontal center line of the screen. Projection system. The method of claim 1, wherein the optical engine LCD; An illumination optical system for illuminating the LCD; And And a projection lens configured to project an image formed on the LCD with the reflection mirror and to project a projection optical axis formed between the projection lens first surface and the screen to coincide with the horizontal center line of the screen when viewed from the front of the system. System. 3. The system of claim 2, wherein the projection lens is configured such that the optical axis between at least the first and second projection lenses coincides with the horizontal center line of the screen when viewed from the front of the system.