KR20150141219A - three-demensional projection system for shortening projection distance - Google Patents

Abstract

The present invention relates to a three-dimensional projection system for shortening a projection distance. Provided is a three-dimensional projection system for shortening a projection distance, comprising: an image display part for emitting light; a reflecting system installed at one side of the emission path of light emitted from the image display part and reflecting the light emitted from the image display part in a radial shape; a screen installed above the image display part to be able to rotate; a rotating force providing means connected to one side of the screen to provide a rotating force to the screen; and a projection unit connected to one side of either or both of the screen and the rotating force providing means to rotate together around the center of the reflecting system if the screen rotates, and project the light reflected by the reflecting system on the screen by changing the direction of the light. According to the present invention, as described above, the projection distance of light can be reduced by allowing the reflecting system to reflect the light, which is emitted from the image display part, in a radial shape and project the light on the screen through the projection unit. Also, the present invention can be manufactured easily and manufacturing costs can be reduced as a three-dimensional image can be displayed easily while a diffracting plate for diffracting light emitted from the image display part to form a three-dimensional image, i.e., a stereoscopic image is not required.

Description

[0001] The present invention relates to a three-dimensional projection system,

The present invention relates to a three-dimensional projection system in which a projection distance is shortened, and more particularly, to a projection system capable of shortening a projection length of light and a diffraction plate for diffracting light emitted from an image display unit to form a three- Dimensional projection system in which a 3D image can be easily displayed without requiring a simple operation, and a projection distance for reducing manufacturing costs is shortened.

With the recent popularization of media content, the demand for high-definition and large-sized display devices is increasing. In accordance with this demand, the aspect ratio of the TV as a popular display means is increasing. However, There is a problem that it is difficult to purchase.

Accordingly, demand and technology development for a projection display capable of obtaining a large screen aspect ratio at a relatively low price as compared with a TV as one of large display devices is actively being developed.

[0002] A known projection system is a device for emitting an image signal to light emitted from a light emitting device and projecting the image signal on the front or rear surface of the screen to view the image. The CRT method, the DMD (Digital Micromirror Device) , A reflective liquid crystal panel method, and a transmissive liquid crystal panel method. Recently, a three-dimensional projection system for displaying a 3D image has been developed.

1 is a schematic view of a conventional three-dimensional projection system.

As shown in FIG. 1, the conventional three-dimensional projection system 100 includes an image display unit 110 for emitting light, a diffraction grating 120 for diffracting light incident upon rotation when light emitted from the image display unit 110 is incident on one surface, The screen 130 on which the light diffracted from the diffraction plate 120 is projected and one side of the rotation axis are connected to one side of the screen 130 and the diffraction plate 120 to form the screen 130 and the diffraction plate 120 120 for providing a rotational force to the rotating shaft.

In this conventional three-dimensional projection system 100, when light is emitted from the image display unit 110, the emitted light is diffracted by the diffraction plate 120, and the light diffracted by the diffraction plate 120 is reflected by the screen 130 And the 3D image is displayed on the screen 130. [

However, in the conventional three-dimensional projection system 100, the light emitted from the image display unit 110 is incident on the diffraction plate 120, the light incident on the diffraction plate 120 is diffracted and projected onto the screen 130 So that it is difficult to apply to a product having a narrow space such as a table top.

In addition, the conventional three-dimensional projection system 100 is transferred to the DM unit by the body or the combined structure of the product to which the vibration generated when the rotation force providing means 140 rotating the screen 130 is rotated Problems such as image blurring due to vibration of the rotational force providing means 140, resolution degradation, shortening of the life of the image display unit 110, and the like have occurred.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the projection length of light and to provide a three-dimensional image, Dimensional projection system in which a 3D image can be easily displayed without requiring a plate, thereby simplifying fabrication and reducing a projection distance.

It is another object of the present invention to provide an image display apparatus and a display apparatus which are provided with a rotation force providing means for providing a rotation force to a screen and a vibration display means provided in a space where the image display portions are separated from each other, Dimensional projection system in which a projection distance is shortened in advance to prevent problems such as deterioration of image quality, damage of an image display unit, and the like.

According to an aspect of the present invention, there is provided an image display apparatus including: an image display unit that emits light; a display unit that is provided at one side by emitting light emitted from the image display unit and reflects light radiated from the image display unit A screen provided rotatably above the image display section, a rotation force providing means connected to one side of the screen to provide a rotational force to the screen, and at least one of the screen and the rotation force providing means And a projection unit that is connected to one side of the screen and rotates together with the center of the reflection system when the screen is rotated, and changes the direction of the light reflected by the reflection system to be projected on the screen Dimensional projection system in which the projection distance is shortened.

The image display unit preferably includes at least one light source and a DM (Digital Micromirror) unit for receiving the light emitted from the light source and reflecting the incident light.

The image display unit may further include a diffusion lens for diffusing the light reflected by the DM unit.

It is also preferable that the projection unit is made up of a plurality of reflection mirrors, and the direction of light is changed in accordance with reflecting light reflected from the reflection system to be projected on the screen.

The projection unit may use a prism, refract light reflected from the reflection system, and project the light onto the screen.

Preferably, the rotational force providing means is provided so as to be separated from the image display portion so that the vibration generated when the rotational force is generated is not transmitted to the image display portion.

In addition, the reflection system is formed of an annular plate, and can reflect the light emitted from the image display unit at least once.

The reflection system includes a first annular reflector provided below the image display unit and radially reflecting the light emitted from the image display unit, and a second annular reflector provided above the first annular reflector, A second annular reflector for radially reflecting the light reflected from the first annular reflector, and a second annular reflector provided below the second annular reflector for reflecting the light reflected from the second annular reflector in a radial direction And a third annular reflector.

Also, the screen may be inclined at a predetermined angle, and one side of the rotational force providing means may be connected to the center.

According to the present invention as described above, it is possible to shorten the projection length of light by reflecting the light radiated from the image display unit in a radial manner and projecting the light onto the screen through the projection unit, and the three- The 3D image can be easily displayed without requiring a diffraction plate for diffracting the light emitted from the image display unit, so that the manufacture is simple and the manufacturing cost can be reduced.

In addition, it is also possible to provide rotational force providing means for providing a rotational force to the screen, and image display portions provided in mutually separated spaces to prevent the vibration generated from the rotational force providing means when the rotational force is generated from being transmitted to the image display portion, It is possible to prevent problems such as damage of the display device.

1 schematically illustrates a conventional three-dimensional projection system,
FIG. 2 is a perspective view of a three-dimensional projection system having a reduced projection distance according to an embodiment of the present invention,
FIG. 3 is a side view of a three-dimensional projection system in which a projection distance is shortened according to an embodiment of the present invention;
FIG. 4 is a cross-sectional perspective view of a DM unit according to the present invention, FIG. 5 is a view showing a state where a reflection mirror is used as a projection unit according to an embodiment of the present invention,
5 is a view showing a state in which a reflection mirror is used as a projection unit according to an embodiment of the present invention;
6 is a view illustrating a state in which light is projected on a screen by a reflecting system and a projection unit according to an embodiment of the present invention,
7 is a view showing a state in which a screen and a projection unit are rotated according to an embodiment of the present invention;

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

FIG. 2 is a perspective view of a three-dimensional projection system having a reduced projection distance according to an embodiment of the present invention, FIG. 3 is a side view of a three-dimensional projection system having a reduced projection distance according to an embodiment of the present invention, FIG. 5 is a view showing a state where a reflection mirror is used as a projection unit according to an embodiment of the present invention. FIG.

2 to 5, the three-dimensional projection system 1 in which the projection distance is shortened according to an embodiment of the present invention includes an image display unit 10, a reflection system 20, a screen 30, Providing means 40 and a projection unit 50.

The image display unit 10 includes at least one light source 11, a DM (Digital Micromirror) unit for receiving and reflecting the light emitted from the light source 11, and a diffusion for diffusing the light reflected by the DM unit 12 And a lens 13, and serves to emit the light to be projected onto the screen 30. As shown in Fig.

As described above, at least one light source 11 is provided to emit light to be projected on the screen 30, and an LED may be used as the light source 11.

The DM unit 12 includes a housing 12a, a processor 12b installed on one side of the housing 12a, a plurality of fine driving mirrors 12c and a fine driving mirror 12c provided on one side of the housing 12a, The reflection angle control unit 12d controls the reflection angle of the fine driving mirror 12c according to an image signal to control the reflection angle of the light incident from the light source 11, .

More specifically, the DM unit 12 has a structure in which a plurality of fine driving mirrors 12c capable of adjusting the angle of reflection by the reflection angle control means 12d are integrated, for example, hundreds of thousands of them, and the fine driving mirrors 12c The reflection angle is adjusted corresponding to each pixel.

In other words, the micro-driving mirror 12c adjusts the reflection angle according to the image signal inputted to each pixel by the processor 12b, and causes the incident light to be incident on the reflection system 20 described later according to the adjusted reflection angle .

For example, when the image signal input to the pixel is an on signal, the reflection angle of the fine driving mirror 12c has a first angle, and the DM unit 12 reflects the light incident from the reflection mirror When the image signal inputted to the pixel is off, the light incident from the reflection mirror is incident on a predetermined second position of the reflector 20, .

The diffusing lens 13 is disposed under the DM unit 12 and diffuses the light emitted from the DM unit 12 so as to be totally reflected by a reflection system 20 to be described later, So that the emitted light can be radially reflected by the reflector 20.

The reflector 20 includes a first annular reflector 21 provided at a lower portion of the image display unit 10 and a second annular reflector 22 provided at an upper portion of the first annular reflector 21, And a third annular reflector 23 disposed on the outer side of the first annular reflector 21 in the lower part of the second annular reflector 22.

The first annular reflecting portion 21, the second annular reflecting portion 22 and the third annular reflecting portion 23 are formed in a ring shape in the reflecting system 20, and the first annular reflecting portion 21, The first annular reflecting portion 21 and the third annular reflecting portion 23 are formed so that the diameter of the first annular reflecting portion 21 is smaller than the inner diameter of the third annular reflecting portion 23 so that the first annular reflecting portion 21 and the third annular reflecting portion 23 can be arranged concentrically. do.

The reflector 20 reflects the light diffused by the diffusion lens 13 upwardly in the first annular reflector 21 and reflects the light reflected by the second annular reflector 22 downward And reflects the light reflected by the second annular reflector 22 in the third annular reflector 23 again so as to be reflected upward in the radial direction.

That is, the reflection system 20 reflects the light diffused by the diffusing lens 13 in the radial direction, and at least the light diffused by the diffusion lens 13, that is, the light emitted from the DM unit 12, So that the projection length of the light is shortened.

The screen 30 serves to project the light emitted from the DM unit 12 through the reflectometer 20 and the projection unit 50 to provide an image to the spectator, It is obvious to those skilled in the art that such a device can be purchased and used in a commercially available manner, and a detailed description of the configuration will be omitted.

On the other hand, the screen 30 according to the present embodiment is installed to be inclined at a predetermined angle. This is because when the viewpoint of the spectator is located above the screen 30 like the table top, So that the user can view the image.

The rotational force providing means 40 includes a driving motor 41 and a rotary shaft 42 coupled to one side of the driving motor 41 and the other side connected to the center of the screen 30, The rotating shaft 42 is rotated and the rotating shaft 42 is rotated to provide a rotating force to the screen 30 connected to one side.

That is, the rotational force providing means 40 serves to rotate the screen 30 on which the image is projected by 360 ° so that the image projected on the screen 30 can be viewed from multiple directions.

The projection unit 50 serves to reflect or refract light reflected by the reflection system 20 and to project the light onto the screen 30, and a prism or a reflection mirror can be used.

When the prism is used as the projection unit 50, the light reflected by the reflection system 20 is refracted to change the moving direction of the light so that light is projected on the screen 30, If used, changes the direction of movement of some of the light reflected upward by the reflector 20 and is projected onto the screen 30. [

In this case, when a reflecting mirror is used as the projection unit 50, a first reflecting mirror 51 that reflects downward a part of the light reflected upward is reflected by the first reflecting mirror 51, And a second reflection mirror 52 for projecting the light onto the screen 30. In this configuration, the incident angle of the light is reduced so that the loss rate of the light amount can be greatly reduced.

In this embodiment, a focal lens 60 may be further provided between the projection unit 50 and the screen 30. The focal lens 60 focuses the light incident from the projection unit on the screen 30 So as to improve the image quality.

FIG. 6 is a view illustrating a state in which light is projected on a screen by a reflecting system and a projection unit according to an embodiment of the present invention. FIG. 7 is a view illustrating a state in which a screen and a projection unit according to an embodiment of the present invention are rotated Fig.

The operation of the three-dimensional projection system 1 having a reduced projection distance according to an embodiment of the present invention having such a structure will be described with reference to FIGS. 6 and 7. FIG.

Prior to the explanation, it is assumed that a reflecting mirror is used as the projection unit 50 for convenience of explanation in this operation explanation.

First, the light emitted from the light source 11 is incident on the DM unit 12, and the light incident on the DM unit 12 is reflected downward by the fine drive mirror whose reflection angle is controlled in accordance with the image signal.

The light reflected by the DM unit 12 is diffused while passing through the diffusion lens 13, and the diffused light is reflected to the first annular reflecting portion 21. As described above, the first annular reflecting portion 21 are formed in a ring shape are upwardly reflected in a radial direction.

As described above, the light reflected by the first annular reflector 21 is reflected downward by the second annular reflector 22 positioned on the upper side, and the downward reflected light is reflected again by the third annular reflector 23). ≪ / RTI >

That is, the light having passed through the diffusing lens 13 is reflected at least once by the first annular reflecting portion 21, the second annular reflecting portion 22 and the third annular reflecting portion 23 Shortens the projection length of light and reflects the light in a radial direction.

Thereafter, the light radially upwardly reflected by the third annular reflector 23 is reflected by the plurality of reflection mirrors, is changed in its moving direction, and is projected onto the screen 30.

When the user wants to view an image projected on the screen 30 in multiple directions, the screen 30 and the projection unit 50 rotate while the rotation force providing means 40 is driven. As described above, 5, a part of the light is incident on the projection unit 50 and reflected, and the reflected light passes through the focus lens 60 (see FIG. 5) And the 3D image is displayed as it is projected on the rotating screen 30.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications and variations without departing from the spirit and scope of the invention. Accordingly, the appended claims are intended to cover such modifications or changes as fall within the scope of the invention.

10: image display section 11: light source
12: DM unit 13: diffuse lens
20: Reflector 21: First annular reflector
22: second annular reflector 23: third annular reflector
30: screen 40: rotational force providing means
41: drive motor 42:
50: projection unit 51: first reflection mirror
52: second reflection mirror

Claims (10)

An image display unit for emitting light;
A reflection system provided on one side of the light output from the image display unit and configured to reflect the light emitted from the image display unit in a radial direction;
A screen rotatably installed above the image display unit;
A rotational force providing means connected to one side of the screen to provide rotational force to the screen; And
Wherein the light source is connected to one side of at least one of the screen and the rotative force providing means so as to rotate together with the center of the reflector when the screen rotates to change the direction of the light reflected by the reflector, Wherein the projection unit includes a plurality of projection units.

The method according to claim 1,
The image display unit
At least one light source; And
And a DM (Digital Micromirror) unit which receives the light emitted from the light source and reflects the incident light.
3. The method of claim 2,
The image display unit
Further comprising a diffusion lens for diffusing the light reflected by the DM unit.
The method according to claim 1,
Wherein the projection unit is made up of a plurality of reflection mirrors and changes a moving direction of light according to reflection of light reflected from the reflection system so as to be projected on the screen.
The method according to claim 1,
Wherein the projection unit uses a prism and refracts the light reflected from the reflection system to be projected on the screen.
The method according to claim 1,
Wherein the rotation force providing means is provided separately from the image display unit so as to prevent a vibration generated when a rotational force is generated from being transmitted to the image display unit.
The method according to claim 1,
Wherein the reflection system is formed of an annular plate and reflects the light emitted from the image display unit at least once or more.
The method according to claim 1,
The reflectometer
A first annular reflecting portion provided below the image display portion and radially reflecting the light emitted from the image display portion;
A second annular reflector provided on the first annular reflector for radially reflecting the light reflected from the first annular reflector; And
And a third annular reflector provided below the second annular reflector for reflecting the light reflected from the second annular reflector in a radial manner.
The method according to claim 1,
Wherein the screen is inclined at a predetermined angle, and one side of the rotational force providing means is connected to the center of the screen.
The method according to claim 1,
Further comprising a focus lens interposed between the projection unit and the screen, the focus lens condensing the light incident from the projection unit to project the screen.

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