KR102340229B1 - Image projection system - Google Patents

Abstract

An image projection system is disclosed. The system includes a curved mirror, an image source device for providing an image to a projector, a curved screen on which an image is displayed, and a projector disposed on the top or bottom surface of the curved screen, and projecting the image to the curved mirror, the curved mirror comprises: It is disposed on the optical path of the image projected from the projector, the image is reflected and displayed on the curved screen, and the curvature of the curved mirror coincides with the curvature of the curved screen. Accordingly, device efficiency and user convenience may be improved.

Description

Image projection system {IMAGE PROJECTION SYSTEM}

The present invention relates to an image projection system, and more particularly, to an image projection system for projecting an image onto a curved screen using a projector.

BACKGROUND ART Projectors for magnifying and projecting the contents of an on-screen display of an information terminal such as a personal computer are widespread. For example, projectors can be commonly found in conference rooms, theaters, religious facilities, and the like.

However, when an image is reproduced using a projector, a certain distance between the projector and the screen, that is, a minimum projection distance is required. As such, when a certain distance between the projector and the screen is reduced, the viewer's image immersion may also be reduced.

Accordingly, a curved screen was employed to improve the viewer's image immersion, and to narrow the projection distance between the projector and the screen, a flat mirror was used to reflect the image beam through the flat mirror to project the image on the screen. .

In the prior art, an image projection system is configured including a curved screen and a flat mirror in order to improve the viewer's immersion and shorten the projection distance.

In this case, due to the shape of the curved screen, screen pincushion distortion (distortion in which the edge of the image is concave) and barrel distortion (distortion in which the center of the image protrudes convexly) may occur. For this, measures such as software correction processing and manual correction processing were necessary.

In addition, if the projection distance is configured to be short, there is a problem in that the viewer's shadow is displayed on the curved screen by blocking the image beam.

The present invention has been devised to solve the above problems, and one object of the present invention is to provide an image projection system equipped with a curved screen and a curved mirror having the same curvature.

Another object of the present invention is to provide an image projection system that improves a viewer's sense of immersion.

Another object of the present invention is to provide an image projection system that does not cover an image by a viewer and provides a relatively short projection distance.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the description below. will be able

In order to achieve the above or other objects, an image projection system according to an aspect of the present invention is disposed in a curved mirror, an image source device for providing an image to a projector, a curved screen on which the image is displayed, and an upper or lower surface of the curved screen and a projector for projecting the image onto the curved mirror, wherein the curved mirror is disposed on an optical path of the image projected from the projector, reflects the image and displays it on the curved screen, The curvature may match the curvature of the curved screen.

Here, the curved mirror and the curved screen may be configured in the form of a sphere, a cylinder, or an ellipse.

In addition, the present image projection system may further include a support for fixing the curved mirror, the curved screen and the projector.

Also, when the projector is tilted, the projector may adjust the keystone of the image to correct distortion of the image and control the image so that the image reflected from the curved mirror does not meet a specific region of the viewer.

In addition, the curved mirror and the curved screen are configured in a spherical shape, and the horizontal center of the center point (Pp) of the projector, the center point (Mp) of the curved mirror, and the center point (Sp) of the curved screen can be arranged on a straight line. .

The effect of the image projection system according to the present invention will be described as follows.

According to at least one of the embodiments of the present invention, there is an advantage in that image distortion can be alleviated by providing an image projection system equipped with a curved screen and a curved mirror having the same curvature.

In addition, according to at least one of the embodiments of the present invention, by employing the above-described image projection system, there is an advantage that the viewer's sense of immersion in the image can be improved.

In addition, according to at least one of the embodiments of the present invention, by employing the above-described image projection system, the image is not obscured by the viewer and a relatively short projection distance is provided, thereby improving device efficiency and economic feasibility.

In addition, according to at least one of the embodiments of the present invention, an image projection system for minimizing image distortion using one curved screen and one curved mirror is provided, thereby improving user convenience and device efficiency.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those of ordinary skill in the art to which the present invention belongs from the following description. will be.

1 is a view showing an example of an image projection system to which the present invention is applied.
2 is a block diagram of an image projection system according to an embodiment of the present invention.
3 to 5 are diagrams specifically illustrating the structure of the image projection system shown in FIG. 1 .
FIG. 6 is a diagram illustrating an image being projected in the image projection system shown in FIG. 1 .
7 and 8 are views showing various embodiments to which the image projection system proposed by the present invention is applied.

Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but the same or similar components are assigned the same reference numbers regardless of reference numerals, and redundant description thereof will be omitted. The suffixes "module" and "part" for components used in the following description are given or mixed in consideration of only the ease of writing the specification, and do not have distinct meanings or roles by themselves. In addition, in describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in this specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical idea disclosed herein is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present invention , should be understood to include equivalents or substitutes.

Terms including an ordinal number such as 1st, 2nd, etc. may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

When an element is referred to as being “connected” or “connected” to another element, it is understood that it may be directly connected or connected to the other element, but other elements may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

The singular expression includes the plural expression unless the context clearly dictates otherwise.

In the present application, terms such as “comprises” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

1 is a view showing an example of an image projection system to which the present invention is applied.

1, the image projection system 1 includes a curved screen 10, a projector 20, a curved mirror 30, and first to third supports 40-1 to 40-3, and an image source device (not shown). city) may be included.

First, the first support 40 - 1 may serve to fix the curved mirror 30 . The first support 40 - 1 may support the curved mirror 30 so that the lens direction of the projector 20 is directed toward the curved mirror 30 .

In addition, the second and third supports may fix the projector 20 and the curved screen 10 . Meanwhile, the first to third supports may be integrally configured.

The curved screen 10 is an area in which an image is displayed. The curved screen 10 is composed of a curved surface rather than a flat surface. The curved surface may be formed in the form of a sphere, an ellipse, a cylinder, or the like.

The projector 20 corresponds to a device for projecting an image in the form of a beam. The projector 20 may be disposed near the upper surface or the lower surface of the curved screen 10 .

Also, the projector 20 may receive an image from an image source device (not shown, for example, a PC) and project the image on the curved mirror 30 .

The projector 20 may perform keystone correction by tilting or the like by itself. Keystone correction can be said to be a correction that corrects image distortion.

Also, an image source device (not shown) that provides an image to the projector 20 may include a device and software capable of detecting and correcting image distortion.

The curved mirror 30 may be disposed on the optical path of the image projected from the projector 20 . The curved mirror 30 may be arranged to reflect an image beam projected from the projector 20 to the curved screen 10 to reproduce an image on the curved screen 10 .

When the image projection system 1 employs a flat mirror, the projection distance inevitably becomes longer. The image projection system 1 proposed by the present invention employs a curved mirror, so that the projection distance can be configured to be shorter than when a flat mirror is employed.

In addition, the present image projection system 1 provides a curved screen having the same curvature as that of the curved mirror, thereby reducing image distortion caused by employing the curved mirror.

In addition, the present image projection system 1 provides the advantage of making the screen more advantageous than the case of employing a flat mirror in the case where a shadow is formed on the screen by the viewer obscuring the image beam. This is because, when a flat mirror is employed, the projection distance is also relatively longer, so that the viewer is more likely to block the image beam.

2 is a block diagram of an image projection system according to an embodiment of the present invention.

According to FIG. 2 , the image projection system 1 may include an image source device 100 and a projector 200 . The image projection system 1 includes a curved mirror and a curved screen, but will be omitted in this drawing.

The image source device 100 is a device that provides an image to the projector 200 . The image source device 100 includes a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation system, a slate PC, It may include a tablet PC, an ultrabook, a wearable device, for example, a watch-type terminal (smartwatch), a glass-type terminal (smart glass), a head mounted display (HMD), etc. have. Also, the image source device 100 may include an image digital TV, a desktop computer, a digital signage, and the like.

The image source device 100 may transmit an image to the projector 200 by wire or wirelessly. In addition, the image source device 100 may be equipped with software capable of correcting image distortion when the image is distorted.

Also, the image source device 100 may detect that the image is displayed on the curved screen with the projector 200 and adjust the image so that the image itself is displayed on the curved screen.

The projector 200 may receive an image from the image source device 100 and display the image in the form of a beam with a curved mirror. The image projection system requires a certain distance (projection distance) to fall between the projector 200 and the screen.

When the projector 200 is tilted, the projector 200 may correct image distortion by adjusting the keystone of the image.

Here, the keystone distortion refers to distortion that occurs when an image beam is tilted and reaches the screen. In this case, the projector 200 may correct the distortion of the image by adjusting the keystone.

Also, the projector 200 may control the image so that the image reflected from the curved mirror does not meet a specific region of the viewer. That is, the projector 200 may adjust the image so that the image beam does not hit the viewer.

Meanwhile, the above-described keystone adjustment function of the projector 200 and the function of controlling the image so that the image beam does not strike the viewer may also be performed by the image source device 100 .

3 to 5 are diagrams specifically illustrating the structure of the image projection system shown in FIG. 1 .

According to FIG. 3 , if a line parallel to the floor is F and a line parallel to F is C, then the projector 320 is inclined at line C and T.

The angle T at which the projector 320 is tilted may be set within a range in which the projector 320 can correct keystone. Here, the keystone correction function may be referred to as a function of correcting image distortion due to the tilt of the projector 320 .

The projector 320 may project an image.

A path of the beam by the projector 320 toward the uppermost portion of the curved mirror 330 will be referred to as an A1 path, and a path through which the A1 path is reflected from the curved mirror 330 will be referred to as an A2 path. In addition, the path of the beam that the projector 320 faces toward the lowermost portion of the curved mirror 330 is called a B1 path, and the path B1 path is reflected from the curved mirror 330 is called a B2 path.

Here, the image projection system 1 may be set such that the angle A1B2 formed by A1 and B2 is smaller than the angle B1A2 formed by B1 and A2. Otherwise, light interference may occur.

In addition, the image can be clearly seen on the curved screen 310 only when the sum of the A1 path and the A2 path is equal to or greater than the minimum projection distance.

In addition, in the imaging system 1, each B2F formed by B2 and F may be configured to be less than or equal to 90 degrees.

In this case, the user must watch the curved screen 310 from the right side of the B2 path so that a shadow does not appear on the curved screen 310 .

Here, the imaging system 1 may set the curved screen 310 and the curved mirror 330 to have the same curvature. For example, the imaging system 1 may configure the curved screen 310 and the curved mirror 330 in a spherical shape.

Here, in the image projection system 1 , the plurality of vertical distances VD1 to VD3 between the curved screen 310 and the user may maintain a constant distance compared to the vertical distance of the flat display. Accordingly, the image projection system 1 may further enhance the image immersion to the user.

4 is a diagram illustrating an image projection system when a curved screen and a curved mirror are configured in a spherical shape according to an embodiment of the present invention.

According to FIG. 4 , the image projection system 1 may generate an image and provide it to the projector 420 . The projector 420 may project an image from the projector centripetal point Pp to the spherical mirror 430 .

In this case, in the image projection system 1 , the center point Mp of the spherical mirror 430 and the center point Sp of the spherical screen 410 may be arranged on a straight line. In this case, the image projection system 1 can alleviate the horizontal distortion of the image.

As such, the image projection system 1 sets the same curvature of the curved mirror 430 as well as the curved screen 410, and the center point of the mirror (Mp), the center point of the screen (Sp), and the center point of the projector (Pp). By placing it in a straight line, the distortion of the image can be alleviated.

In addition, the user may reduce keystone distortion occurring in the spherical screen 410 by adjusting the keystone opposite to the angle T at which the projector 420 is inclined. Accordingly, the image projection system 1 can be set so that the image can be projected evenly over the entire spherical screen 410 and alleviating image distortion without correction by software.

Also, in the image projection system 1 , the plurality of vertical distances HD1 to HD3 between the spherical screen 410 and the user may maintain a constant distance compared to the vertical distance of the flat panel display. Accordingly, the image projection system 1 may further enhance the image immersion to the user.

5 is a diagram illustrating an image projection system according to an embodiment of the present invention.

According to FIG. 5 , according to FIG. 3 , if a line parallel to the floor is C and a line parallel to C is F, the projector 320 is inclined at line C and T.

The projector 320 may be disposed at the lower end of the curved screen 310 . In this specification, the projector 320 has been described as being disposed in the upper and lower directions of the curved screen 310, but being disposed in the left/right lateral directions of the curved screen 310 may also fall within the scope of the present invention. . However, in this case, the curved mirror 330 may also be changed to a position corresponding thereto.

The projector 320 may project the image to the curved mirror 330 . A path of the beam by the projector 320 toward the uppermost portion of the curved mirror 330 will be referred to as an A1 path, and a path through which the A1 path is reflected from the curved mirror 330 will be referred to as an A2 path. In addition, the path of the beam that the projector 320 faces toward the lowermost portion of the curved mirror 330 is called a B1 path, and the path B1 path is reflected from the curved mirror 330 is called a B2 path.

Here, each A1B2 formed by A1 and B2 should be smaller than each B1A2 formed by B1 and A2. Otherwise, light interference may occur.

In addition, the image can be clearly seen on the curved screen 310 only when the sum of the A1 path and the A2 path is equal to or greater than the minimum projection distance.

Here, in the image projection system 1 , the plurality of vertical distances VD1 to VD3 between the curved screen 310 and the user may maintain a constant distance compared to the vertical distance of the flat display. Accordingly, the image projection system 1 may further enhance the image immersion to the user.

FIG. 6 is a diagram illustrating an image being projected in the image projection system shown in FIG. 1 .

Referring to FIG. 6 , the image projection system 1 may include a curved screen 310 , a projector 320 , and a curved mirror 330 . In addition, the image projection system 1 may further include a support.

The image projection system 1 may display an image on the curved screen 310 . An image source device (not shown) may generate an image and transmit it to the projector 320 . The projector 320 may transmit an image to the curved mirror 330 in the form of a beam, and the curved mirror 330 may display the reflected image on the curved screen 310 .

In this case, the image projection system 1 may maintain a constant distance between the curved screen 310 and the user (VD1 to VD3, Vertical Distance) compared to the vertical distance of the flat panel display. In addition, the image projection system 1 may maintain a constant distance between the curved screen 310 and the user (User) for a plurality of horizontal distances HD1 to HD3 compared to the vertical distance of the flat display. Accordingly, it is possible to provide a feeling of image immersion to the user.

7 and 8 are views showing various embodiments to which the image projection system proposed by the present invention is applied.

7 , an image may be displayed on the curved screen 310 .

In this case, an image source device (not shown) may provide an image to a projector, and the projector may provide an image to a user using a curved mirror and a curved screen.

In this case, the image projection system 1 may provide a feeling of image immersion to the user.

In particular, when the image source device (not shown) generates a 3D image and provides it to the user, it is possible to provide a greater sense of immersion in the image to the user.

Referring to FIG. 8 , the image projection system 1 may provide an image that enhances the exercise effect in the gym GYM to the User.

The image projection system 1 may provide a more excellent exercise effect to the user by providing a more immersive image to the user.

The present invention described above can be implemented as computer-readable codes on a medium in which a program is recorded. The computer-readable medium includes all types of recording devices in which data readable by a computer system is stored. Examples of computer-readable media include Hard Disk Drive (HDD), Solid State Disk (SSD), Silicon Disk Drive (SDD), ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, etc. There is also a carrier wave (eg, transmission over the Internet) that is implemented in the form of. In addition, the computer may include the control unit 180 of the terminal. Accordingly, the above detailed description should not be construed as restrictive in all respects but as exemplary. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are included in the scope of the present invention.

1: image projection system 100: image source device
200: projector

Claims (5)

In the image projection system,
curved mirror;
an image source device that provides an image to the projector;
a curved screen on which the image is displayed; and
A projector disposed in the upper surface or lower surface direction of the curved screen and projecting the image to the curved mirror; includes,
The curved mirror is
disposed on the optical path of the image projected from the projector, the image is reflected and displayed on the curved screen, the curvature of the curved mirror coincides with the curvature of the curved screen,
A path of the beam directed by the projector toward the uppermost portion of the curved mirror is referred to as an A1 path, and a path through which the A1 path is reflected from the curved mirror toward the upper side of the curved screen is referred to as an A2 path, and the projector is located on the curved surface When the path of the beam toward the lowermost part of the mirror is referred to as the B1 path, and the path where the B1 path is reflected from the curved mirror toward the lower side of the curved screen is referred to as the B2 path,
The angle A1-B2 formed by the A1 path and the B2 path facing the lower side of the curved screen is set to be smaller than the angle B1-A2 formed by the B1 path and the A2 path facing the upper side of the curved screen. system. According to claim 1,
The curved mirror and the curved screen are image projection system, characterized in that configured in the form of a sphere, a cylinder, or an ellipse. According to claim 1,
The image projection system further comprising a; support for fixing the curved mirror, the curved screen and the projector. According to claim 1,
The projector is
When the projector is tilted, the image projection system, characterized in that by adjusting the keystone of the image to correct the distortion of the image and to control the image so that the image reflected from the curved mirror does not meet a specific area of the viewer. According to claim 1,
The curved mirror and the curved screen are configured in a spherical shape,
The image projection system, characterized in that the horizontal center of the center point (Pp) of the projector, the center point (Mp) of the curved mirror, and the center point (Sp) of the curved screen are arranged on a straight line.

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