KR20020023505A - 3-dimensional hologram image projector - Google Patents

Abstract

The present invention relates to a holographic three-dimensional image projection apparatus, the apparatus of the present invention is to enlarge the diameter of the light generated from the light source to provide a holographic film, and reflected from the transmissive hologram film by the light enlarged by the lens And a diffuser screen on which a stereoscopic image of the actual image to be reproduced is projected.

The present invention further includes a cruciform aperture attached to the front of the lens and converting the light magnified by the lens into a cruciform light.

Therefore, the image of the hologram can be projected onto the diffuser screen to observe a stereoscopic image through the screen, and the size of the hologram can be enlarged or reduced by changing the magnification of the lens.

Description

Hologram Stereo Image Projection Device {3-DIMENSIONAL HOLOGRAM IMAGE PROJECTOR}

The present invention relates to a hologram reproducing apparatus, and more particularly, to a holographic stereoscopic image projection apparatus capable of observing a holographic stereoscopic image by light that is transmitted and scattered by projecting a holographic image enlarged using a hologram on a screen. .

In general, a method of implementing a 3D stereoscopic image is largely divided into a stereoscopic image method and a hologram method. The stereoscopic imaging method separates a photographic or computer graphic image into a left eye image and a right eye image, and then enters the left and right eyes of an observer wearing glasses with a polarized liquid crystal plate to feel a stereoscopic image.

On the other hand, the hologram method is a method of observing a three-dimensional image as if it were a real object without wearing special glasses such as a polarizing liquid crystal panel when observing the hologram produced using a laser. Therefore, there is an advantage that the observer does not feel fatigue because the three-dimensional feeling is excellent and not wearing special glasses. Nevertheless, holographic stereoscopic images have not been presented with an effective projection apparatus, and thus practical problems have been raised.

Referring to Fig. 1, a diagram illustrating the principle of observing a hologram of a virtual image generated by a typical hologram reproducing method is illustrated. When the light source 20 shines on the hologram 10, the observer 30 observes the virtual image 40 while looking at the hologram at a predetermined distance away from the front surface of the hologram 10.

However, at this time, the size of the hologram 10 should be manufactured to the size corresponding to the stereoscopic image 40 to be observed. For example, in order to observe a stereoscopic image of 1 m x 1 m, there is a problem of making a large hologram 1 m x 1 m in size.

Therefore, the present invention has been filed to solve the problems in the holographic observation method of the prior art, to provide a holographic stereoscopic image projection apparatus that allows a plurality of observers to simultaneously observe an enlarged stereoscopic image using a small hologram. For that purpose.

A holographic stereoscopic image projection apparatus according to a preferred embodiment of the present invention for achieving the above object includes: a light source; A light transmitting hologram film in which an image to be reproduced is recorded; A color selective mirror array for selectively reflecting red, green and blue wavelengths of light from the light generated by the light source; A lens disposed between the color sorting mirror array and the transmissive hologram film to enlarge a diameter of light reflected from the color sorting mirror array and provide the holographic film; And a diffusion plate screen on which a stereoscopic image of a real image reproduced by being transmitted through the transmissive hologram film is projected by the light enlarged by the lens.

A holographic stereoscopic image projection apparatus according to another preferred embodiment of the present invention includes: a light source; A light reflective hologram film in which an image to be reproduced is recorded; A color selective mirror array for selectively reflecting red, green and blue wavelengths of light from the light generated by the light source; A lens disposed between the color sorting mirror array and the reflective holographic film to enlarge a diameter of light reflected from the color sorting mirror array and provide the holographic film; And a diffuser screen on which a three-dimensional image of a real image reflected and reproduced from the reflective hologram film is projected by the light enlarged by the lens.

1 illustrates a typical hologram observation scheme,

2 is a block diagram of a transmission holographic stereoscopic image projection device according to a first embodiment of the present invention;

3 is a block diagram of a reflective holographic stereoscopic image projection device according to a second embodiment of the present invention;

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

110: light source 120: color sorting mirror array

130 lens 140 cross-shaped opening

150: scanning module 160: light transmitting hologram film

170: diffuser screen 180: reflective mirror

190: light reflective holographic film

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

Prior to the description of the present invention, a method of reproducing holograms is described. The reproduction of the hologram is to generate an image by the light scattered from the hologram film by scanning at a constant angle a laser of the same wavelength used to record the image on the hologram film. In this case, two types of hologram images to be reproduced are virtual images and virtual images. In general, the hologram image refers to a virtual image of a virtual image, and the image of the real image is not important. The virtual image is a three-dimensional image that can be observed when looking directly at the hologram, while the holographic three-dimensional image has a distinctive feature, while the magnification cannot be magnified by itself, resulting in a narrow viewing angle. On the other hand, in reality, the light is incident on the hologram is reflected from the outside of the hologram, that is, the three-dimensional image exiting into the space, the feature itself has a problem of expanding itself, but had to be projected on the screen. The fact that the image is enlarged makes it possible to obtain a large screen image from a small hologram. However, when the magnified image is projected onto the screen and the reflected wave scattered on the screen is observed, it is not seen as a 3D image but appears as a form close to 2D.

The present invention will be described in detail as follows so that the image enlarged from the hologram can be viewed as a three-dimensional stereoscopic image opposite to the direction of incidence of light, and the same components will be used with the same reference numerals throughout the drawings.

Referring now to FIG. 2, there is shown a transmission holographic stereoscopic projection apparatus constructed in accordance with a first embodiment of the present invention.

As shown in FIG. 2, the transmissive holographic stereoscopic image transmitting apparatus of the present invention includes a light source array 110, a color sorting mirror array 120, a lens 130, a cross opening 140, a scanning module 150, and a light beam. The transmissive hologram film 160 and the diffuser screen 170 are included.

The light source 110 includes a small general white light laser or diode laser that generates white light in which red, green, and blue are mixed for color stereoscopic image reproduction. Alternatively, as a light source 110, a set of small light emitting diodes 111, 112, and 113 which respectively generate red, green, and blue light may be used. The beam generated from the light source 110 is incident on the color sorting mirror array 120.

The color selective mirror array 120 is composed of wavelength selective mirrors 121, 122, 123 that selectively filter light of a desired wavelength. Each of the wavelength selection mirrors 121, 122, and 123 selectively filters the light of the red, blue, and green wavelengths required from the light incident from the light source 110, and each of the filtered red, green, and blue wavelengths. Reflect light in the 90 ° direction. Light of each of the red, green, and blue wavelengths reflected by the wavelength selection mirrors 121, 122, and 123 travels in the same path in a straight line and is collected in the lens 130.

The lens 130 enlarges the diameter of the incident light reflected from each of the wavelength selection mirrors 121, 122, and 123, and the light enlarged by the lens 130 is cross-shaped opening 140 and the scanning module 150. It is incident to the hologram film 160 via the. As a result of employing the lens 130, the size of the actual image reproduced from the hologram film 160 can be further enlarged, and the size of the holographic image is changed by changing the magnification of the lens 130 or moving the position of the lens 130. Can change.

On the other hand, the cross-shaped opening 140 is disposed in front of the lens 130, and has a structure of cross-shaped slit for light to pass through. The cross-shaped opening 140 converts light whose diameter is enlarged by the lens 130 into cross-shaped light through the cross-shaped slit, and transmits the light to the hologram film 160 through the scanning module 150.

By using a method of converting the shape of the light provided from the lens 130 through the cross-shaped opening 140 into a cross shape and then entering the hologram film 160, the out of focus of the stereoscopic image projected on the diffuser screen 170 is reduced. As a result, the speckle phenomenon can be reduced, and a clean image that maximizes the horizontal and vertical effect of the stereoscopic image can be realized.

According to the present invention, the cross-shaped slits formed in the cross-shaped opening 140 may have a cross-shaped shape of up, down, left and right symmetrical or asymmetrical, may be prepared by forming a cross-shaped opening on a glass plate, or may be manufactured by forming a cross-shaped opening in a thin metal plate. . The more efficient form of this slit is preferably an asymmetrical cross shape with longer left and right than up and down because the viewer's moving range is larger than the top and bottom, so that the horizontal three-dimensional effect is increased in preparation for the left and right movement. This is because implementation is effective. However, when the size of the screen is not large, the shape of the slit does not necessarily have to be cross-shaped, and may be manufactured in consideration of convenience in any form of square, rectangular, or polygonal.

According to the present invention, it is also possible to configure the hologram film 160 in a symmetrical or asymmetrical cross shape instead of using the cross opening 140 having the cross slit, in which case the same as using the cross opening 140. Results in:

The scanning module 150 is disposed between the lens 130 and the transmissive hologram film 160 to change the position of the light scanned on the hologram 160 through the cross slit of the cruciform opening 140. The scanning module 150 includes a step motor 152 and a scanning mirror 154 mounted on the step motor 152. The step motor 152 rotates the scanning mirror 154 at a predetermined angle to rotate the cross slit. The position of the light that passes through the hologram film 160 and is scanned is varied. As a result, the real stereoscopic image 200 generated from the hologram film 160 may be implemented as a moving image to give a moving animation effect. In addition, by controlling the rotation speed of the step motor 152, it is possible to control the playback speed of the video.

According to the present invention, the video may be implemented in a state in which the light reflected from the reflective mirror 154 is fixed without using the step motor 152 in the scanning module 150. It is like a conventional film that rotates the film wound on the reel of the projector to realize the video, and puts the reel that rolls the hologram film in the form of a roll in which the images of continuous motion are recorded in sections. The video can be realized by irradiating a white light laser while rotating the reels by section.

The hologram film 160 records an image to be reproduced, and the diffusion screen 170 includes a holographic stereoscopic image 200 in which light from the light source 110 passes through the hologram film 160 and is transmitted to the space. A display panel to be projected, comprising a diffuser screen of translucent material. Accordingly, the observer can spatially observe the holographic stereoscopic image of the real image reproduced from the hologram film 160 on the front surface of the diffusion screen 170, that is, opposite the direction of light travel. Substantially, the actual image of the hologram reproduced from the hologram film 160 is largely magnified primarily by the laser beam generated from the light source 110 and secondly magnified by the lens 130.

In terms of material, the screen 170 may use a holographic diffuser screen manufactured by a holographic method. In this case, the view angle of the holographic image may be widened to about 180 ° and the brightness of the stereoscopic image may be further improved. Can be.

3 shows a reflective holographic stereoscopic projection apparatus of a second preferred embodiment of the present invention.

The holographic stereoscopic projection apparatus shown in FIG. 3 uses a light reflection hologram film 190 instead of the light transmission hologram film 160 used in FIG. 2 as a hologram film, and the light of the light source 110 is a light reflection hologram film ( It is similar to the holographic stereoscopic projection apparatus shown in FIG. 2 except that a reflecting mirror 180 is used that is incident toward the front of 190. Therefore, detailed description of the same components as in FIG. 2 is omitted.

The reflective mirror 180 is generated from the light source 110 to perform the function of reflecting the cross-shaped light passing through the color screening mirror array 120, the lens 130, and the cross-shaped opening 140 to the scanning module 150. . The reflection function by the reflecting mirror 180 is a light reflecting film instead of the light transmitting hologram film 160 used in FIG. 2, so that light is incident on the front surface of the reflecting hologram film 190. It is used for the purpose. Therefore, the cross-shaped light whose position is changed through the scanning module 150 is scanned into the hologram film 190, is reflected from the hologram film 190, and is projected as a real hologram stereoscopic image on the translucent diffuser screen 170.

Accordingly, the observer can watch a stereoscopic image as if the translucent diffuser screen 170 on which the actual hologram image 200 transmitted from the hologram 190 is projected is observed from the front, that is, opposite the hologram 190. .

As described above, the holographic stereoscopic image projection apparatus of the present invention is an original stereoscopic image projection apparatus that has not been developed yet, and the configuration of the device is simpler than that of any conventional stereoscopic image projection that does not use the hologram system. A perfect viewing angle close to ° can be obtained.

In addition, the holographic stereoscopic image projection apparatus of the present invention can project a stereoscopic image through the screen from the opposite side by projecting the actual image of the hologram on the diffuser screen instead of observing the virtual image of the hologram when viewing the conventional hologram By solving the problem of the conventional hologram, which requires a large hologram to obtain a large three-dimensional image, it is possible to enlarge the projection from the small hologram to the large three-dimensional image and project it on the screen.

The present invention also provides the effect of faithfully realizing the horizontal and vertical three-dimensional effects inherent in the hologram by using a lens and a cross-shaped aperture, and reducing the out-of-focus phenomenon on the screen due to the large distance sense of the three-dimensional image. I have it. In addition, by changing the magnification of the lens, it is possible to freely enlarge or reduce the size of the hologram.

According to the present invention, since the image transmitted through the diffuser screen is viewed from the opposite side, it is as if the effect of watching a large projection television, the three-dimensional image can be realized by the holographic stereoscopic image projection apparatus of the present invention The effect of video projection television can be obtained.

Claims (23)

In the holographic stereoscopic projection apparatus, Light source; A light transmitting hologram film in which an image to be reproduced is recorded; A color selective mirror array for selectively reflecting red, green and blue wavelengths of light from the light generated by the light source; A lens disposed between the color sorting mirror array and the transmissive hologram film to change the size of light reflected from the color sorting mirror array and provide the holographic film; And a diffuser screen for projecting a stereoscopic image of the actual image reproduced by passing through the transmissive hologram film by light enlarged by the lens. The apparatus of claim 1, wherein the holographic stereoscopic image projection device comprises: And a cross-shaped opening disposed between the lens and the hologram film and having a cross-shaped slit for converting light changed by the lens into cross-shaped light. The holographic stereoscopic image projection apparatus of claim 2, wherein the cross slit is symmetrical. The holographic stereoscopic image projection apparatus of claim 2, wherein the cross slit is asymmetrical. The holographic stereoscopic image projection apparatus according to claim 1, wherein the light source comprises a white light laser diode. The holographic stereoscopic image projection apparatus of claim 1, wherein each of the light sources includes red, green, and blue light emitting diodes that emit red, green, and blue light, respectively. The holographic stereoscopic image projection apparatus of claim 1, wherein the diffuser screen is a holographic diffuser screen. The holographic projection apparatus of claim 1, wherein: And a scanning module disposed between the lens and the hologram to change the position of light scanned on the hologram film to implement an animated stereoscopic video. The method of claim 8, wherein the scanning module is: A scanning mirror that scans the light provided from the lens into the hologram film; And a motor for rotating the scanning mirror at a preset angle and speed, wherein the scanning mirror is mounted. The holographic stereoscopic image projection apparatus of claim 1, wherein the holographic projection apparatus enables an image of light scattered and projected onto the diffuser screen to be viewed from the front of the screen. The method of claim 1, wherein the hologram film comprises a hologram film in the form of a roll film in which an image of a continuous motion is recorded, The hologram projection apparatus may further include a reel module disposed between the lens unit and the hologram film in the form of a roll film to continuously move the roll form hologram film to realize an animated stereoscopic video. Holographic stereoscopic projection apparatus. In the holographic stereoscopic projection apparatus, Light source; A light reflective hologram film in which an image to be reproduced is recorded; A color selective mirror array for selectively reflecting red, green and blue wavelengths of light from the light generated by the light source; A lens disposed between the color sorting mirror array and the reflective holographic film to change the size of light reflected from the color sorting mirror array and provide the holographic film; And a diffuser screen for projecting a stereoscopic image reflected and reproduced from the light reflective hologram film by the light changed by the lens. The apparatus of claim 12, wherein the holographic stereoscopic image projection device comprises: And a cross-shaped opening disposed between the lens and the hologram film and having a cross-shaped slit for converting light enlarged by the lens into cross-shaped light. The holographic stereoscopic image projection apparatus of claim 13, wherein the cross slit is symmetrical. The holographic stereoscopic image projection apparatus of claim 13, wherein the cross slit is asymmetrical. The holographic stereoscopic image projection apparatus of claim 12, wherein the light source comprises a white light laser diode. The holographic stereoscopic image projection apparatus of claim 12, wherein each of the light sources includes red, green, and blue light emitting diodes that emit red, green, and blue light, respectively. 13. The holographic stereoscopic image projection apparatus according to claim 12, wherein the diffuser screen is a holographic diffuser screen. 13. The holographic projection device of claim 12, wherein: And a scanning module disposed between the lens and the hologram to change the position of light scanned on the hologram film to implement an animated stereoscopic video. 20. The apparatus of claim 19, wherein the scanning module is: A scanning mirror that scans the light provided from the lens into the hologram film; And a motor for rotating the scanning mirror at a predetermined angle and speed, wherein the scanning mirror is mounted. 13. The holographic stereoscopic image projection apparatus of claim 12, wherein the holographic projection apparatus enables an image of light scattered and projected onto the diffuser screen to be viewed from the front of the screen. The holographic stereoscopic projection apparatus of claim 12, wherein the holographic projection apparatus further comprises a reflection mirror reflecting light magnified by the lens to the scanning module. The method according to claim 11, wherein the hologram film comprises a hologram film in the form of a roll film in which continuous motion is recorded, The hologram projection apparatus may further include a reel module disposed between the lens unit and the hologram film in the form of a roll film to continuously move the roll form hologram film to realize an animated stereoscopic video. Holographic stereoscopic projection apparatus.