KR200214652Y1 - Multi-panel connection device for rear projection screen - Google Patents

Abstract

The present invention relates to a multi-panel combining apparatus of a rear projection screen for arranging and fixing screen panels each provided with a Fresnel lens and a lenticular lens side by side up, down, left and right on the same plane, and scanning a beam from the rear of each screen panel. A groove of a predetermined depth is formed along each edge of the screen panel, and a rectangular cutout extending from the groove toward the Fresnel lens is formed at each edge of the screen panel. A fixing film is disposed at the cutout, and a locking part extending from one end of the fixing film to the left and right is disposed in the groove. The screen panel is fixed to the frame assembly by a fixing film.

Description

MULTI-PANEL CONNECTION DEVICE FOR REAR PROJECTION SCREEN}

The present invention relates to a rear projection screen, and more particularly, to a multi-panel combining apparatus of a rear projection screen formed of a multi-panel interconnected by a frame.

Projectors, i.e., projection type image display apparatuses, include a large-screen liquid crystal display (LCD), and the like. However, the LCD has a large light loss due to the polarizing plate, and a thin film transistor for driving the LCD is formed for each pixel, so that there is a limit in increasing the aperture ratio (light transmission area), and thus the light efficiency is very low.

Therefore, Aura, USA, has developed a projector using actuated mirror arrays (AMA). Projectors using AMA are distinguished from using one-dimensional AMA and two-dimensional AMA. The one-dimensional AMA has mirror surfaces arranged in an M × 1 array, and the two-dimensional AMA has mirror surfaces arranged in an M × N array. Therefore, a projector using a one-dimensional AMA pre-scans M × 1 rays using a scanning mirror, and a projector using a two-dimensional AMA projects an M × N beams to display an image having an array of M × N pixels. .

Projection screens used in the aforementioned projectors are generally of two types. In one type, there is a front projection screen in which the image is projected on the screen in the same direction as the viewer sees. In another type, there is a rear projection screen that projects the image on the back side of the screen in a direction opposite to the viewer viewing the image on the front of the screen. In most cases, the rear projection screen consists of multiple panels, which are interconnected to form a continuous viewing area. Multiple panels may be used to display multiple images or one large image.

An assembly of such panels is commonly called a screen, which has a Fresnel lens on the projector side and a lenticular lens on the observer side. In addition, the screen is made of a transparent resin to which a diffuser such as SiO ₂ , CaCO ₃ , TiO ₃ , BaSO ₄ , ZnO, Al (OH) _3, or the like is added.

According to the rear projection screen configured as described above, the Fresnel lens acts as a field lens for the projection image beam from the projection lens of the projector, thereby focusing the beam projected on the screen in the direction of the observer. The projection beam is dispersed to some extent as it passes through the diffusing agent inside the screen, and is determined by adjusting the concentration or thickness of the diffusing agent according to the required angle of field view. The lenticular lens, which is the final transmission path, serves to further disperse the projected image beam dispersed by the above-described process at a desired horizontal collimation angle in the horizontal direction. In this process, the observer can observe the projection image beam formed on the screen with a constant vertical and horizontal viewing angle.

In the structure of the multi-panel screen described above, frames are used to interconnect the screen panels in a screen forming relationship. One frame disclosed in US Pat. No. 5,103,339 employs front and rear brackets connected with fasteners. The brackets cooperate to interpose opposing edge portions of adjacent rear projection screen panels therebetween. The straight edges of the edge portions of the intervening panels are spaced at regular intervals by bracket fasteners disposed therebetween. Along the outer portion of the bracket, the front of the front and rear brackets frictionally engage the front and back of the panel superimposed by the bracket to hold and hold the panel in an assembled state. However, since the panels are not disposed between the fasteners, the central portion of the bracket where the fasteners are disposed at longitudinally spaced intervals no longer holds the panels.

Although the above described structure is very effective, there is a need to reduce the screen separation width of the front and rear brackets. In particular, although complex computer systems commonly used to generate data projected on multi-panel rear projection screens are designed to appear seamless across the entire screen surface, i.e. any image in a frame. Frames interfere with the continuity of the image even though there is no loss of the image because no projection is made.

More specifically, the front bracket disposed on the lenticular lens surface has a disadvantage in that when one image is formed on a screen formed of a multi-panel, the image is interrupted in a lattice form.

It is therefore an object of the present invention to provide a multi-panel combining device of a rear projection screen capable of maximally reducing the physical separation of the image generated at the contacts between the panels.

1 is a perspective view, partially broken away, of a multi-panel combining device of a rear projection screen having a rectangular frame assembly and a screen panel attached to the assembly;

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

10a, 10b: screen panel

12: home

20: fixed film

22: locking part

30: frame assembly

32, 34: frame

In order to achieve the above object, according to the present invention, the rear projection screen for arranging and fixing the screen panel on which the Fresnel lens and the lenticular lens, respectively, are arranged side by side up, down, left and right on the same plane, and scanning a beam from the rear of each screen panel. In the multi-panel combining apparatus of claim 1, grooves of a predetermined depth are formed along each edge of the screen panel, and each edge of each of the screen panels is formed with a rectangular cutout extending from the groove toward the Fresnel lens. A fastening film is disposed at the attachment, a locking portion extending from one end of the fixed film to the left and right sides is disposed in the groove, and the screen panel is provided by the multi-panel combining device of the rear projection screen, which is fixed to the frame assembly by the fastening film. do.

Each of the frames has a support and a support extending from the support and having a thickness less than that of the support. The thin plate-like fixing film is preferably a synthetic resin plate or a steel plate, and the holder is interposed between a pair of opposite fixing films.

Hereinafter, with reference to the drawings, a multi-panel coupling device according to a preferred embodiment of the present invention will be described in detail.

In the screen panels 10a and 10b shown in the drawing, grooves 12 having a predetermined depth are formed along edges in the thickness direction. Each of the grooves is formed with a rectangular cutout 11 extending from the groove toward the Fresnel lens side.

The cutout portion 11 is disposed with a thin plate-shaped fixing film 20 having a thickness of about 0.35mm. The fixing film 20 includes a locking portion 22 inserted into the groove 12 formed at the edge of the screen panel, and a through hole 24 in the main body. If necessary, in order to more securely fix the fixing film 20 to the screen panel, the fixing film 20 may be adhered to the screen panel by an adhesive. The fixed film is preferably a synthetic resin plate or steel sheet.

The fixing film 20 inserted into the screen panel is fixed to the frame assembly 30 by screws 42. In addition to fixing the screen panel as described above, the frame assembly also serves to remove the afterimage of the beam projected from the projector. The frame assembly is shown only partially in the figure, but is configured by arranging the plurality of longitudinal frames 32 and the transverse frames 34 to be orthogonal to one another to accommodate individual screen panels.

Each of the frames 32 and 34 has supports 32a and 34a and supports 32b and 34b extending from the support and having a smaller thickness than the supports. As shown in the figure, the fixing stand 32b is interposed between the opposite fixing films 20, and is fixed in place by screws 24. Although not shown in the figure, the fixing film attached to the other side of the screen panel is also fastened to the holder of the other support.

According to the above-described configuration, the screen panels are only disposed closely to each other, and no clamping force is applied to each other. Therefore, even if the screen panel is deformed due to humidity, temperature, or the like in the room, the shape can be maintained individually. Therefore, concave / convex phenomenon due to shrinkage, expansion, etc. of the screen does not occur.

In addition, since there is no gap between the screen panels, there is little effect on the continuity of the image. Therefore, even if a plurality of screen panels are provided, an effect similar to using one large screen can be obtained.

Claims (4)

In the multi-panel combining apparatus of the rear projection screen for arranging and fixing screen panels each having a Fresnel lens and a lenticular lens side by side up, down, left and right on the same plane, and scanning a beam from the rear of each screen panel, A groove having a predetermined depth is formed along each edge of the screen panel, At each edge of the screen panel is formed a rectangular cutout extending from the groove toward the Fresnel lens, A fixing film is disposed at the cutout, and a locking part extending from the one end of the fixing film to the left and right is disposed in the groove. And the screen panel is fixed to the frame assembly by a fixing film. The multi-panel bonding apparatus of claim 1, wherein the thin plate fixing film is a synthetic resin plate or a steel thin plate. 3. The frame assembly of claim 2, wherein the frame assembly is comprised of a plurality of transverse and longitudinal frames joined with the securing film, the transverse and longitudinal frames being arranged in a mutually orthogonal manner to individually surround the screen panels. And each of the frames includes a support and a support extending from the support and having a thickness less than that of the support. 4. The multi-panel combining device of a rear projection screen according to claim 3, wherein the holder is interposed between a pair of opposite fixing films, and the fixing plate and the pair of fixing films are fixed by screws.