JPH0511238A - Projection system - Google Patents

Abstract

PURPOSE:To make combination of the screens themselves more natural, when a multi-screen is composed by combining mutually plural screens projected from plural projectors. CONSTITUTION:The combined part of 2 screens A, B obtained by an enlarged projection on a screen from 2 sets of a first and a second liquid crystal projector is made a comb-shaped form respectively with an electric means or a mechanical means and the positions of both projectors are adjusted such that the comb- shaped combined parts are mutually engaged and then both screens A and B are combined, so the multi-screen is composed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection system having a plurality of projectors.

[0002]

2. Description of the Related Art Conventionally, in a projection system including a plurality of projectors, a plurality of screens projected from the respective projectors are combined with each other to form a multi-screen. For example, in a liquid crystal projection system including two front projection type first and second liquid crystal projectors, three liquid crystal displays for red (R), green (G), and blue (B) from both liquid crystal projectors. Two images A and B are obtained by enlarging and projecting the composite image (color image) of the panel on the screen,
As shown in FIG. 9, these two screens A and B are precisely adjusted so that they do not overlap each other, or they are joined together, or, as shown in FIG. 10, a common image P is projected on the joined portion of the screens A and B, respectively. The images P are combined while being adjusted so as to accurately overlap each other to form a multi-screen.

[0003]

However, in such a conventional screen combining method, in the former case, the image is not smooth and dirty at the connecting part of the screens A and B, and in the latter case, the image is common at the connecting part. It was very difficult to adjust the overlapping of the images of the above, and the blurring occurred due to the double projection of the images, and the joint part became bright due to the increase in the brightness due to the overlapping, and the connection between the screens in both became unnatural. . The present invention has been made in view of such a point, and when a plurality of screens projected from a plurality of projectors are combined with each other to form a multi-screen, the combination of the screens is more natural. The purpose of the invention is to provide a projection system.

[0004]

In order to achieve the above object, according to the present invention, in a projection system in which a plurality of screens projected from a plurality of projectors are combined with each other to form a multi-screen, The present invention is provided with means for forming comb-shaped portions so that the joint portions on which a common image is displayed are meshed with each other. Specifically, the means is supplied to each projector so that the joint portions of each screen are comb-shaped. A replacement circuit that replaces a part of the video signal with a black level signal, or a comb-teeth-shaped mask plate that partially blocks the projection light from each projector.

[0005]

According to this structure, the joint portion on which a common image on each screen is projected is formed into a comb tooth shape by an electrical or mechanical means, and the comb tooth shaped joint portions are mutually formed. By combining the screens so that they mesh with each other, a multi-screen is constructed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquid crystal projection system for connecting two screens A and B projected from two first and second liquid crystal projectors to each other as an embodiment of the present invention will be described below with reference to the drawings. In the present embodiment, as shown in FIG. 1, two screens A and B obtained by enlarging and projecting on the screen from two first and second liquid crystal projectors are made into comb teeth, and the comb teeth are formed. Adjust the positions of both liquid crystal projectors so that the connecting parts of
By combining B, a multi-screen as shown in FIG. 2 is configured. Specifically, a part of the video signal supplied to each of the first and second liquid crystal projectors (that is, a common video part) is alternately replaced with a black level signal for a certain period of time to electrically generate the video. Is provided with a replacement circuit as shown in FIG.
1 and 2 are video signals SA1 to both liquid crystal projectors,
Input terminals SB1 are input from the digital multi-image creation apparatus, and input terminals 3, 4 are input image signals SA1 and SB, respectively.
1 to horizontal and vertical sync signals H1, V1, H2, V2-S
A sync separator circuit 5 for extracting YNC is provided for horizontal and vertical sync signals H1, V1, H2, V from the sync separator circuits 3, 4, respectively.
A pulse generation circuit for alternately outputting the replacement pulses SP1 and SP2 for each certain period as shown in FIGS. 4 (c) and 4 (f) based on 2-SYNC, and 6 is a black level signal SBK (see FIG. 4 (b)). The black level signal circuits 7 and 8 for outputting output the video signals SA1 and SB1 respectively inputted to the input terminals 1 and 2 based on the replacement pulses SP1 and SP2 respectively, or the black level signal from the black level signal circuit 6 A switching circuit for switching whether to output SBK. The switching circuits 7 and 8 change the black level signal SBK to the video signal S for the pulse width period T of the replacement pulses SP1 and SP2 (corresponding to the width L of the common video P).
The output is made in place of A1 and SB1. Here, by changing the output cycle of the replacement pulses SP1 and SP2 which are alternately output from the pulse generating circuit 5, the comb tooth width M of the common image P displayed on the combined portion of the screens A and B is changed. You can

Therefore, when a video signal as shown in FIG. 4A is input to the input terminal 1, a video partially replaced with the black level signal SBK as shown in FIG. 4D based on the replacement pulse SP1. The signal SA2 is output from the switching circuit 7 to the video processing circuit of the first liquid crystal projector. for that reason,
The video processing circuit performs signal processing and demodulation processing into R, G, and B, and supplies them to the R, G, and B liquid crystal display panels, respectively, and the video projected on each liquid crystal display panel (see FIG. 5). When a part of the common image P is black Q (image in which light is shielded) and is enlarged and projected on the screen as shown in FIG.
As described above, it is possible to obtain the screen A in which the joint portion on which the common image P is projected is comb-shaped. Similarly, when the video signal SB1 as shown in FIG. 4 (e) is input to the input terminal 2, the video signal partially replaced with the black level signal SBK as shown in FIG. 4 (g) based on the replacement pulse SP2. SB2 is output to the video processing circuit of the second liquid crystal projector. Therefore, the video processing circuit performs signal processing and demodulation processing into R, G, and B and supplies the signals to the R, G, and B liquid crystal display panels, respectively, and the video projected on each liquid crystal display panel (Fig. As shown in 6, a part of the common image P is black Q
When the (light-shielded image) is combined and enlarged and projected on the screen, a screen B having a comb-shaped connecting portion on which the common image P is displayed can be obtained as shown in FIG.

Next, in FIGS. 7 and 8, so-called masking is performed so that the end portions of the liquid crystal display panels of the first and second liquid crystal projectors are covered with comb-shaped mask plates 9 and 10 to prevent light from passing therethrough. By performing the operation so as not to project the image mechanically, it is possible to obtain the screens A and B in which the joint portion where the common image P is projected is comb-shaped as shown in FIG. That is, as shown in FIG. 7, the comb-teeth shaped mask plate 9 is moved from the solid line to the dotted line position to mechanically cover one end side of each of the R, G and B liquid crystal display panels of the first liquid crystal projector. When light is prevented from passing through and a video signal is supplied to each liquid crystal display panel in this state and the images displayed on each liquid crystal display panel are combined and enlarged and projected on the screen, the combined portion is changed as shown in FIG. It is possible to obtain a comb-shaped screen A. Similarly, as shown in FIG. 8, the comb-teeth-shaped mask plate 10 is moved from the solid line to the dotted line position to mechanically cover one end sides of the R, G, and B liquid crystal display panels of the second liquid crystal projector. When light is prevented from passing through and a video signal is supplied to each liquid crystal display panel in this state and the images displayed on each liquid crystal display panel are combined and enlarged and projected on the screen, the combined portion is changed as shown in FIG. It is possible to obtain a screen B having a comb shape. Here, the comb tooth length N of the comb-shaped mask plates 9 and 10 is adapted to correspond to the width L of the common image, and the first and second
When only one of the liquid crystal projectors is projected to obtain a normal screen, the mask plates 9 and 10 may be moved from the dotted line to the solid line position. In the present embodiment, the edges of each liquid crystal display panel are covered with comb-shaped mask plates to partially block the light projected from each projector onto the screen. A plate may be provided to partially block light.

[0009]

As described above, according to the projection system of the present invention, the joint portion on which a common image on each screen is projected is formed into a comb-like shape, and the comb-like joint portion is adjusted so as to mesh well. By connecting each screen to each other to form a multi-screen, it is easy to combine the screens and smooth without causing blurring or increase in brightness due to double projection of images at the combined part. Can be combined with, to form a more natural multi-screen.

[Brief description of drawings]

FIG. 1 is a diagram showing a combined portion of screens A and B according to the present invention.

FIG. 2 is a diagram showing the combined state.

FIG. 3 is a diagram showing an example of a replacement circuit for obtaining a combined portion of the screens A and B.

FIG. 4 is a signal waveform diagram thereof.

FIG. 5 is a diagram showing an image example of each liquid crystal display panel in the first liquid crystal projector.

FIG. 6 is a diagram showing an image example of each liquid crystal display panel in the second liquid crystal projector.

FIG. 7 is a diagram showing an example in which a combined portion of the screen A is formed in a comb shape by a mask plate.

FIG. 8 is a diagram showing an example in which a combined portion of the screen B is formed in a comb shape by a mask plate.

FIG. 9 is a diagram showing a conventional multi-screen configuration example.

FIG. 10 is a diagram showing another example of a multi-screen configuration.

[Explanation of symbols]

3, 4 sync separation circuit 5 pulse generation circuit 6 Black level signal circuit 7, 8 switching circuit 9,10 mask plate

Claims (3)

[Claims] 1. In a projection system in which a plurality of screens projected from a plurality of projectors are combined with each other to form a multi-screen, a comb-teeth shape is formed so that common parts of the screens on which a common image is projected are meshed with each other. A projection system, characterized in that it is provided with means. 2. The replacement means replaces a part of a video signal supplied to each projector with a black level signal so that a combined portion of each screen has a comb shape. 1. The projection system according to 1. 3. The comb-shaped mask plate for partially blocking the projection light from each projector so that the combined portion of each screen has a comb-teeth shape. The projection system described in.