JPH06230738A - Multiple screen display method and its application device - Google Patents

Abstract

PURPOSE:To display different videos on the different observation areas of one display device by using a double lenticular screen holding a diffusion plate between two lenticular lenses as a light directional control screen. CONSTITUTION:The light directional control screen (double lenticular screen) 109 is formed into such a structure that the diffusion plate 102 is held between the two lenticular lenses (1)101 and (2)103 provided with semicylindrical microlenses. The videos projected from projectors A105 and B106 form the observation areas A107, B108 at positions symmetric to the double lenticular screen 109, respectively. Thereby, the video can be observed at the area. Furthermore, since two projectors are installed at different positions, respectively, the observation areas can be formed at the different positions, respectively, that prevents overlapping from occurring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-screen display method and an apparatus for implementing the same, and more particularly to a technique effective when applied to a display device such as a video conference system and a game system.

[0002]

2. Description of the Related Art Conventionally, in order to display a plurality of different display screens on a display device such as a video conference system and a game system, one display screen is divided into a plurality of parts and a plurality of images are displayed respectively. Method, or method of creating a window on one display device and displaying a plurality of display screens in each window, and further preparing a plurality of display devices and displaying each display screen on each display device There was a way to do it.

The divided display method can be easily constructed, is used in a multipoint remote monitoring system, etc., and is useful for collectively grasping all the states. Although the method of displaying in a window has a complicated structure, it is generalized as a method of displaying a workstation or a personal computer. This display method is a flexible multi-screen display method that can respond to randomly generated user requests.

On the other hand, the method of displaying on each of a plurality of display devices has the simplest structure, and is used as a method of displaying images picked up from different angles in a video conference system.

[0005]

However, in the above-mentioned conventional multi-screen display technique, even if one display device is shared by a plurality of people and the video is viewed, the same video is viewed. In the case of a display device for a video game, there is a problem that the display screen cannot be monopolized (private) by each individual.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a novel multi-screen display method for displaying a plurality of projected images on a light directivity control screen. Especially.

Another object of the present invention is to provide a novel multi-screen display device having a double lenticular screen in which a diffusion plate is sandwiched between two lenticular lenses.

The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[0009]

In order to achieve the above object, the present invention projects a plurality of images from different positions on a light directivity control screen to display different images at different positions on the screen. Is a multi-screen display method.

Further, the present invention is a multi-screen display device for displaying projected images from a plurality of projectors installed at different positions as projected images on a light directivity control screen, wherein the light directivity control is performed. The screen is a double lenticular screen in which a diffusion plate is sandwiched between two lenticular lenses.

[0011]

According to the above-mentioned means, since the double lenticular screen in which the diffusion plate is sandwiched between the two lenticular lenses is used as the light directivity control screen, the different observing areas of one display device are different from each other. Video can be displayed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The principle and embodiments of the multi-screen display method of the present invention will be described in detail below with reference to the drawings. In all the drawings for explaining the embodiments, those having the same functions are designated by the same reference numerals, and the repeated description thereof will be omitted.

[Principle] FIG. 2 is a diagram for explaining the principle of the multi-screen display method of the present invention.

As shown in FIG. 2, the light directivity control screen includes a lenticular lens (1) 101 and a diffusion plate 10.
2 and the lenticular lens (2) 103 (the screen configured in this way is hereinafter referred to as a double lenticular screen). Projector 104
The light emitted from passes through the lenticular lens (1) 101 and then forms a point light source 110 on the diffusion plate 102. Light is emitted from the point light source 110 formed on the diffusion plate 102 and passes through the lenticular lens (2) 103. From the projector 104 to the lenticular lens (1)
The distance to 101 is L1, and the lenticular lens (2) 1
If the distance from 03 to the observation position is L2, the following equation is established from a simple proportional relationship.

[0015]

[Formula 1] L2 / L1 = (m2 · p2 · d2) / (m1 · p1 · d1) (1) where m1 and m2 are lenticular lenses (1) 10
1, the number of lenses constituting the lenticular lens (2) 103, p1 and p2 are the lenticular lens (1) 101,
Pitch length of lenticular lens (2) 103, d1, d
2 is the thickness of the lenticular lens (1) 101 and the lenticular lens (2) 103. Further, the lenticular lens (1) 101 and the lenticular lens (2) 103
Were assumed to be formed of the same material. Formula (1)
From the observation position L2, the lenticular lens (1) 10
1. If the number of pitches and pitches of the lenticular lens (2) 103 are the same, the formula (1) is modified to obtain the following formula determined only by the thickness ratio.

[0016]

## EQU00002 ## L2 / L1 = d2 / d1 (1) 'The distance L2 from the double lenticular screen to the observation position is the distance from the projector 104 to the screen.
That is, if the projection distance is constant (if it does not change), it is determined only by the thickness ratio of the lenticular lenses that form the display screen.

Next, how to form the thickness of the lenticular lens and the width of the observation region will be described. In a private display method in which one screen is shared to view a unique image, one viewing area and another viewing area require a wide viewing area which is completely separated from each other. The viewing area is usually formed by the main lobes of a double lenticular screen, which usually has many side lobes. It's a sidelob for one projector, but when another projector is using it as the main lob and it overlaps,
Private presentation cannot be achieved because crosstalk appears.

In designing a double lenticular screen, the thickness of the lenticular lens must be thin to avoid crosstalk.

Next, two lenticular screens were prepared and their light intensity distributions were measured.

[Measurement 1] The lenticular lenses (1) and (2) had the same thickness as the focal length. At this time, the light source and the observation area were arranged at positions symmetrical with respect to the double lenticular screen.

FIG. 3 is a distribution diagram of the light intensity at this time. The strong distribution around 200 cm from the double lenticular screen is due to the main lob. A weak distribution due to sidelobes is observed on both sides.

FIG. 4 is a diagram showing the relationship between the observation position and the light intensity at a distance of 200 cm from the double lenticular screen. A strong peak with a width of about 10 cm is observed at the center of the observation position.

Since the width of the observation area is only 10 cm, when the observer turns his or her head, one eye is displaced from the observation area, and the width of this peak is not sufficient as the width of the observation area.

From this measurement, the lenticular lens (1)
If (2) and (2) have the same thickness, a sufficient observation region cannot be obtained, and it is understood that this is not suitable as a multi-screen display system.

[Measurement 2] Next, the thickness of the double lenticular lens (1) was set to the focal length or less, and the thickness of the lenticular lens (2) was set to the same as the focal length. That is, d
Since 1 <d2, the observation position L2 is calculated from the equation (1) ′.
Can be seen to move backwards.

FIG. 5 is a distribution chart of the light intensity at this time, and it is observed that the peak of the distribution is moved backward and the width of the distribution is expanded.

FIG. 6 is a diagram showing the relationship between the observation position and the light intensity at a distance of 220 cm from the double lenticular screen. It can be seen that although the light intensity is reduced to about 1/4, the width of the observation region is expanded to about 40 cm.

From this measurement, if the condition of d1 <d2 is satisfied, a plurality of different images can be obtained without overlapping on one double lenticular screen, and multi-screen display is possible.

[Embodiment 1] FIG. 1 is a diagram schematically showing a schematic configuration of an embodiment of the present invention.

In the multi-screen display device of this embodiment, as shown in FIG.
As shown in FIG. 3, the light directivity control screen (double lenticular screen) 109 has a structure in which the diffusion plate 102 is sandwiched by two lenticular lenses (1) 101 and lenticular lenses (2) 103 each having a semi-cylindrical micro lens. Has become. Here, the lenticular lens (1) 101 and the lenticular lens (2) 103
Are made of the same material having the same number of lenses, the same focal length, and the same pitch length. And
The thickness of the lenticular lens (1) 101 is thinner than that of the lenticular lens (2) 103 (d1 <d
2).

Projector A105, Projector B1
The images projected from 06 are located at positions symmetrical to the double lenticular screen 109 and the observation area A107,
Since the observation area B108 is formed, the image can be observed in that area.

In the first embodiment, since the two projectors are installed at different positions, the observation areas are also formed at different positions and do not overlap with each other. In addition, if the number of observers increases, within the range where the images do not overlap,
Just add more projectors.

Although the present invention has been specifically described based on the embodiments, the present invention is not limited to the above embodiments, and it goes without saying that various modifications can be made without departing from the scope of the invention. .

[0034]

As described above, according to the present invention, one display device can be shared by a plurality of persons, and an image unique to each person can be observed. That is, since the video can be used exclusively (private), it is not necessary to prepare a plurality of display devices, and the floor space can be effectively used.

In addition, the following new utilization method which has never existed is possible.

In the video conferencing apparatus, if all the attendees can see different images even if they are one display apparatus, instead of all the attendees seeing the same screen, there is an unprecedented application. Will spread. For example, one attendee could have a meeting with a branch office in Tokyo through a video conference, while another attendee could be in contact with a branch office in Osaka. Further, another attendee can display the materials necessary for the meeting on the display device and confirm the materials.

Also in the game display device, a new application can be expected by allowing the game participants to see different images. If two people sit side by side in front of the display device and can see different images, both can enjoy the game interactively, and can also independently enjoy different games.

Various applications can be expected as an educational display device. Different images for teachers and students are displayed on the large-screen display device installed in the classroom. For example, if a question is displayed for a student, the answer is not shown,
On the other hand, answers and explanations are displayed for teachers. The teacher and the student are looking at the same display device but are observing different display screens.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a schematic configuration of an embodiment of a multi-screen display device of the present invention,

FIG. 2 is a diagram for explaining the principle of the multi-screen display method of the present invention,

FIG. 3 is a light intensity distribution diagram of the double lenticular screen of Measurement 1,

FIG. 4 is a diagram showing the relationship between the observation position and the light intensity at a distance of 200 cm from the double lenticular screen of Measurement 1,

FIG. 5 is a light intensity distribution map of the double lenticular screen of measurement 2,

FIG. 6 is a diagram showing the relationship between the observation position and the light intensity at a distance of 220 cm from the double lenticular screen in measurement 2.

[Explanation of symbols]

101 ... Lenticular lens (1), 102 ... Diffusion plate,
103 ... Lenticular lens (2), 104 ... Projector, 105 ... Projector A, 106 ... Projector B, 107 ... Observation area A, 108 ... Observation area B, 109
... light directivity control screen, 110 ... point light source.

Claims (2)

[Claims] 1. A multi-screen display method comprising: projecting a plurality of images from different positions on a light directivity control screen to display different images at different positions on the screen. 2. A multi-screen display device for displaying projection images from a plurality of projectors installed at different positions as projection images on a light directivity control screen, wherein the light directivity control screen is 2 A multi-screen display device, which is a double lenticular screen in which a diffusion plate is sandwiched between a pair of lenticular lenses.