KR101667700B1 - Stereoscopic image projection device - Google Patents

Abstract

The present invention provides a stereoscopic image display device, comprising: a light source for generating light; a display device for forming a left eye image using a first polarization and converting a polarization direction of the left eye image; A first image forming unit having a reflective element for reflecting the light beam of the first polarized light and a reflective element for reflecting the light of the second polarized light, A second image forming unit that reflects light toward the incident path and separates the light generated from the light source into the first polarized light and the second polarized light by reflecting one of the first polarized light and the second polarized light and transmitting the other polarized light, The first image forming unit and the second image forming unit to be incident on the first and second image forming units and to combine the reflected left and right eye images, And a polarized light separating element disposed in the polarizing beam splitter.

Description

[0001] STEREOSCOPIC IMAGE PROJECTION DEVICE [0002]

The present invention relates to a stereoscopic image projection apparatus for projecting polarized light in different directions onto a left eye and a right eye image.

As the information age rapidly develops, the importance of a display system that realizes a large screen is emphasized. As an example of an apparatus for realizing such a large screen, there is an image projection apparatus having a function of enlarging and projecting an image. An image projection apparatus is a device that implements an image using light generated from a light source and projects an implemented image. Representative examples include a projector and a projection television.

Recently, image projection apparatuses are regarded as interior electronic devices for expressing their individuality, and various design forms are required. In addition, various attempts have been applied to an image projection apparatus to realize images that are closer to reality. For example, ultra-small projectors using LEDs as light sources and high-color projectors using laser as light sources have been developed.

In addition to the above attempts, a stereoscopic image projection apparatus that projects a stereoscopic image closer to reality may be considered.

It is an object of the present invention to provide a stereoscopic image projection apparatus that can increase the brightness and realize an image using polarized light.

Another object of the present invention is to provide a stereoscopic image projection apparatus with improved optical performance.

According to an aspect of the present invention, there is provided a stereoscopic image projection apparatus including a light source for generating light, a display device for forming a left eye image using the first polarized light and converting the polarization direction of the left eye image, A first image forming unit configured to reflect the left-eye image with the polarized direction converted to the incident path of the first polarized light, and a second image forming unit configured to reflect the right-eye image using a second polarized light having a polarization direction different from that of the first polarized light, A second image forming unit for converting the right-eye image into the first polarized light and reflecting it toward the incident path of the second polarized light, and a second image forming unit for reflecting the first polarized light and the second polarized light, And separating the light generated from the light source into the first polarized light and the second polarized light to be incident on the first and second image forming units, respectively, To synthesize and a polarization splitting device is disposed between the light source, a first image forming unit and the second image forming part.

In one embodiment of the present invention, the display elements are provided in plural to form the left eye image using the polarized light corresponding to each of the three primary colors, and the reflective element transmits any one of the three primary colors, Is made to reflect. The display device and the reflection device may be arranged in the same arrangement as the second image forming unit in the second image forming unit.

According to one embodiment of the present invention, the polarized light separating element includes an incident portion, a separating portion, first and second input / output portions, and an output portion. The incident portion is configured to cause the light to be incident, and the separator separates the light into the first and second polarized lights by reflecting one of the first and second polarized lights and transmitting the other. The first and second entrance and exit portions are paths through which the first and second polarized lights propagate toward the first and second image forming portions, respectively, and the left and right eye images are respectively incident on the first and second image forming portions It becomes a passage. And the exit portion is a passage through which the left eye and right eye images synthesized so as to face the same optical path in the separating portion are emitted.

According to one embodiment of the present invention, the light source is arranged to face the incident portion, and the first and second image forming portions are disposed to face the first and second entrance portions, respectively. The stereoscopic image projection apparatus may include at least one of a projection lens and a polarization changing element. A projection lens is disposed on the same optical path so as to face the emission part, and enlarges the left eye and right eye images. The polarization changing element is mounted on the emitting portion and is configured to convert the first and second polarized lights into circularly polarized light.

According to one embodiment of the present invention, the light source includes first and second light sources, and the stereoscopic image projection apparatus synthesizes the lights generated from the first and second light sources, respectively, And a synthesizing unit for advancing the image. The combining section includes first and second polarizing elements and a composite polarized light separating element. The first and second polarizing elements are formed to polarize light generated in the first and second light sources into the first and second polarized light, respectively. The composite polarized light separating element includes first and second incidence portions, in which first and second polarized lights polarized in the first and second polarized elements respectively are incident and orthogonal to each other, and the first and second incident polarized lights are synthesized So as to advance to the polarized light separating element.

In an aspect related to an embodiment of the present invention, the stereoscopic image projection apparatus includes a mirror. The mirror is configured to reflect either the first polarized light or the second polarized light emitted from any one of the first and second polarizing elements toward the composite polarized light separating element. Wherein the first and second light sources are parallel to each other, the first light source is disposed to face the mirror, and the second light source is positioned farther from the synthetic polarization separation element with respect to the parallel direction than the first light source have.

According to another aspect of the present invention, there is provided a stereoscopic image projecting apparatus including first and second light sources for generating light, first and second light sources for generating polarized light by first and second polarized lights having different polarization directions, A second polarizer for combining the first polarized light and the second polarized light so as to synthesize the first polarized light and the second polarized light so that the first polarized light and the second polarized light proceed through the same path; The first and second polarizers are formed so as to reflect one of the first polarized light and the second polarized light and transmit the other polarized light to the first polarized light and the second polarized light, The first image forming unit and the second image forming unit to separate the images into the first and second image forming units and to combine the images formed by the first and second image forming units, A first polarization separation element is arranged.

In one aspect related to another embodiment of the present invention, the combining section includes first and second polarizing elements, and a second polarized light separating element. The first and second polarizing elements polarize light generated in the first and second light sources to the first and second polarized lights, respectively, and the second polarized light separating element combines the first and second polarized lights to form the first And the first and second polarized lights are incident on the polarized light separating element.

In the stereoscopic image projection apparatus according to the present invention configured as described above, the left eye and right eye images respectively formed in the plurality of image forming units can be projected to the same optical path through the polarization splitting element. In addition, a stereoscopic image projection apparatus having better optical performance is realized.

Further, the present invention can further increase the brightness of a projected image by using a plurality of light sources and a combining unit.

Hereinafter, an image projection apparatus according to the present invention will be described in detail with reference to the drawings. In the present specification, the same or similar reference numerals are given to different embodiments in the same or similar configurations. As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

1 is a perspective view of a stereoscopic image display system 10 according to an embodiment of the present invention.

A stereoscopic image display system (10) of the present invention includes a stereoscopic image projection apparatus (100), a screen unit (101), and a polarizing glasses unit (102) arranged to implement a stereoscopic image.

The stereoscopic image projecting apparatus 100 is an apparatus that implements an image using light generated from a light source and projects an implemented image, and may be a projector for enlarging and projecting an image as shown in the figure. Hereinafter, the stereoscopic image projection apparatus 100 related to the present invention will be described with reference to a projector. However, the stereoscopic image projection apparatus 100 is not limited to this, and can be applied to, for example, a projection apparatus embedded in a projection television or the like.

The stereoscopic image projection apparatus 100 is formed to project the first and second images 104a and 104b having different polarization directions 103a and 103b together. The polarized light having the different polarization directions may be referred to as first and second polarized lights 103a and 103b, respectively. The first and second polarized lights 103a and 103b may be S waves and P waves, respectively, or P waves and S waves. In the description below, the first and second polarized lights 103a and 103b are S-wave and P-polarized, respectively.

The first and second images 104a and 104b may have a binocular parallax that forms a stereoscopic image. That is, the first and second images 104a and 104b may be left-eye and right-eye images, respectively. However, the present invention is not limited thereto, and the first and second images 104a and 104b may be right eye images and left eye images, respectively.

The screen unit 101 displays an image enlarged and projected by the image projection apparatus 100 on a screen. The screen unit 101 is disposed at a position intersecting the projection direction of the image projection apparatus 100 so that the left and right eye images 104a and 104b are projected. The screen portion 101 may be, for example, a wall surface, an achromatic or silver colored film, or the like. The screen portion 101 may be a polarization maintaining screen, which is formed to maintain the polarized state.

The polarizing glasses section 102 is formed of a polarizing plate corresponding to the different polarization directions 103a and 103b on the left and right sides. Thus, the left and right eye images 104a and 104b having binocular disparity respectively reach the left and right eyes of the user. Therefore, the user can view the stereoscopic image.

Hereinafter, a stereoscopic image projection apparatus capable of realizing the stereoscopic image will be described as an example. 2A and 2B are perspective views of the stereoscopic image projecting apparatus 100 of FIG. 1 viewed from the front and rear, respectively.

The casing (casing, housing, cover, etc.) constituting the appearance of the main body of the stereoscopic image projection apparatus 100 is formed by upper and lower cases 111 and 112. Various optical components and electronic components are embedded in the space formed by the upper and lower cases 111 and 112.

The upper case 111 may be provided with an operation unit 113 or the like. The operation unit 113 is configured to input control commands such as start, end, zoom-in, zoom-out, focusing, and the like, tactile manner, any method can be employed.

The lower case 112 may be provided with a projection unit 114, first and second air flow units 115a and 115b, an interface 116, and the like. The projection unit 114 is formed to enlarge an image projected from the stereoscopic image projection apparatus 100.

The first and second air flow portions 115a and 115b are formed of a plurality of through holes so that air can flow into the image projection device. This makes it possible to cool the image projection device using forced convection.

The interface 116 is a path for allowing the stereoscopic image projection apparatus 100 to exchange data with an external device. The image data corresponding to the image to be projected from the stereoscopic image projection apparatus 100 through the interface 116 can be input from the outside. Referring to these drawings, the interface 116 includes a connection terminal that can be electrically connected to an electronic device, such as a computer, a DVD player, etc., capable of supplying image or audio data.

FIG. 3 is an exploded view of the image projection apparatus 100 of FIG. 1, and FIG. 4 is a conceptual diagram of an optical system of FIG. 3.

Referring to FIG. 3, a control circuit board 121 and a power board 122 may be mounted on the lower case 112. The control circuit board 121 may be configured as an example of a control unit for operating various functions of the stereoscopic image projection apparatus 100. The power supply board 122 receives an alternating current power supply or the like and converts it into a DC power required for driving the image projection apparatus 100.

In the lower case 112, optical elements such as lenses are arranged to form an image and project the light to the outside. A structure (not shown) in which the optical system 130 can be assembled may be additionally disposed between the optical system 130 and the lower case 112.

The optical system 130 includes a light source 131, first and second image forming units 140 and 150, and a polarization splitter 160.

The light source 131 is a device for converting electrical energy into electrical energy to generate light. The light source 131 may be, for example, an ultra high pressure mercury lamp (UHV lamp), an LED (LED), or the like. A stabilizer for stabilizing the electric power supplied to the light source 131 and a cooling fan for generating forced convection may be mounted on the lower case 112 to assist the operation of the light source 131.

The illumination optical element group 132 is disposed adjacent to the light source 131 so that light generated in the light source 131 is illuminated in a predetermined direction. The illumination optical element group 132 means that optical elements such as a lens are arranged so as to form a certain array so that light is focused.

The light focused by the illumination optical element group 132 is incident on the polarization splitting element 160. The polarization separator 160 is adjacent to the illumination optical element group 132 and is disposed between the light source 131, the first image forming unit 140, and the second image forming unit 150. The polarized light separating element 160 is formed so that one of the first and second polarized lights 103a and 103b (see FIG. 1) is reflected and the other is transmitted.

The polarized light separating element 160 may be, for example, a Polarizing Beam Splitter (PBS) element arranged such that the right angle prisms 161a and 161b face each other at the hypotenuse. The polarized light separating element 160 may be provided with polarizing plates 166a and 166b. The polarizers 166a and 166b are formed to further improve the polarization state of the S wave and the P wave.

The first image forming unit 140 includes display devices 141a, 141b, and 141c and a reflective element 142. [

The display elements 141a, 141b, and 141c form a left eye image using the first polarized light 103a and convert the polarization direction of the left eye image.

The display elements 141a, 141b, and 141c are controlled to reflect an incident polarized light to form an image. Specifically, the display elements 141a, 141b, and 141c independently reflect the first polarized light 103a in a plurality of cells corresponding to the left eye image to be realized. The display devices 141a, 141b and 141c are electrically connected to the control circuit board 121 and can be controlled by the control circuit board 121. [

The polarized light reflected by the display elements 141a, 141b, and 141c is converted into the second polarized light 103b. Referring to these drawings, the display devices 141a, 141b, and 141c are plurally provided to form the left eye image using the polarized light corresponding to the three primary colors.

The reflective element 142 is configured to transmit any one of the three primary colors and reflect the other. The reflective element 142 reflects the left eye image whose polarization direction has been converted by the display elements 141a, 141b, and 141c toward the incident path of the first polarized light 103a.

The second image forming unit 150 forms a right eye image using the second polarized light 103b having a polarization direction different from that of the first polarized light 103a and converts the right eye image into the first polarized light 103a And is reflected toward the incident path of the second polarized light 103b. The display devices 141a, 141b and 141c of the first image forming unit 140 and the reflection device 142 are disposed in the second image forming unit 150 so that the first image forming unit 140, They can be arranged in the same arrangement. A simpler optical system 130 can be constructed.

The left eye and right eye images reflected by the polarization splitter 160 after being formed by the first and second image forming units 140 and 150 are synthesized again by the polarization splitter 160. The synthesized left and right eye images are projected outward to form a stereoscopic image.

Hereinafter, the process of forming and projecting an image in the optical system will be described in more detail with reference to FIGS. 5A and 5B. FIG. 5A is a conceptual view illustrating a process of forming an image in the optical system of FIG. 3, and FIG. 5B is a conceptual view illustrating a process of projecting an image in the optical system of FIG.

The polarized light separating element 160 separates the light generated from the light source 131 into the first and second polarized lights 103a and 103b and enters the first and second image forming units 140 and 150, respectively. Specifically, the polarized light separation element 160 reflects the S wave to the first image forming unit 140, and the P wave transmits the second image forming unit 150.

The polarized light separating element 160 includes an incident portion 162, a separating portion 163, first and second input and output portions 164a and 164b, and an output portion 165. [

The light source 131 is arranged to face the incidence portion 162 and the light generated from the light source 131 is incident on the polarization separation element 160 through the incidence portion 162. Referring to these drawings, the incident portion 162 may be one surface of a right angle prism 161a (see FIG. 4) disposed close to the light source 131. FIG.

The separating unit 163 separates the light into the first and second polarized lights 103a and 103b by reflecting one of the first and second polarized lights 103a and 103b and transmitting the other. Referring to these drawings, the separator 163 may be a coating layer of a polymer material that reflects S waves formed at the hypotenuse of the right angle prisms 161a and 161b (see FIG. 4) and transmits P waves.

The first and second access portions 164a and 164b may be one surface of the right angle prisms 161a and 161b arranged to be orthogonal to each other. The first and second image forming units 140 and 150 are disposed to face the first and second entrance portions 164a and 164b, respectively. The first and second entrance and exit portions 164a and 164b are arranged such that the first and second polarized lights 103a and 103b proceed toward the first and second image forming portions 140 and 150, And the left and right eye images are input from the second image forming units 140 and 150, respectively.

Referring to FIG. 5A, S waves incident on the first image forming unit 140 are separated into three primary colors at the reflective element 142.

The reflective element 142 separates the S waves incident on the first image forming unit 140 into blue, green, and red, and supplies the blue, green, and red display elements 141a, 141b, and 141c, (141a, 141b, 141c). The reflector 142 may be, for example, an X (X) dichroic prism, reflecting blue and red on the X (X) plane, and transmitting the green.

Referring to FIGS. 5A and 5B, the display devices 141a, 141b, and 141c include blue, green, and red LCOS (Liquid Crystal on Silicon) display devices, each of which displays polarized light of blue, green, (141a, 141b, 141c). However, the present invention is not limited thereto, and the display devices 141a, 141b, and 141c may be a micro LCD (Liquid Crystal Display) device and a DMD (Digital Micromirror Device).

Of the blue, green, and red that are respectively reflected by the display elements 141a, 141b, and 141c, blue and red are reflected again, and the green is transmitted. That is, the reflecting element 142 reflects the left-eye image in which the polarization direction is converted toward the incident path of the S wave.

The P wave incident on the second image forming unit 150 forms a right eye image through the reflective element 152 and the display elements 151a, 151b, and 151c configured in the same manner as the first image forming unit 140, And reflects the direction-converted right-eye image toward the incident path of the P wave.

5B, the P wave and the S wave emitted from the first and second image forming units 140 and 150 are incident on the polarization splitting element 160 through the first and second entrance and exit portions 164a and 164b, respectively, . The P wave is transmitted through the separator 163 of the polarization splitter 160 and the S wave is reflected so that the left eye and the right eye go through the same optical path.

The output unit 165 is a portion to which the left eye and right eye images synthesized so as to face the same optical path in the separating unit 163 of the polarization separating element 160 are outputted and which is a rectangular prism 161b ). ≪ / RTI >

Referring to FIG. 5B, the polarization converting element 171 may be mounted on the emitting portion 165. The polarization changing element 171 is formed so as to convert the first and second polarized lights 103a and 103b into circularly polarized light and may be, for example, a? / 4 plate which converts linearly polarized light into left circularly polarized light or right circularly polarized light . Thus, the image projection apparatus 100 can project left-eye and right-eye images polarized by left-handed circular polarization or right-handed circular polarization.

A projection lens 114a is disposed in the projection path of the left eye and right eye images. The projection lens 114a is disposed on the optical path of the left eye and the right eye combined with the output unit 165 to enlarge the left eye and right eye images. The projection lens 114a, for example, can be classified into a projection unit 114 (see Fig.

As described above, polarized lights having different polarization directions are transmitted to the plurality of image forming units through the polarization splitting element 160, and the left and right eye images respectively formed by the plurality of image forming units are transmitted through the same optical path A compact optical system can be realized, and a stereoscopic image projection apparatus with better optical performance is realized. Specifically, since the left and right eye images can be projected simultaneously, disturbance of the stereoscopic image due to the projection time difference of the left eye and right eye images can be alleviated.

6 is a conceptual diagram showing an optical system 230 applied to another embodiment of the stereoscopic image projection apparatus according to the present invention.

Referring to this drawing, an optical system 230 of a stereoscopic image projection apparatus includes first and second light sources 231a and 231b that generate light. Light generated by the first and second light sources 231a and 231b is focused through the first and second illumination optical element groups 232a and 232b.

A combining unit 280 is disposed between the light sources 231a and 231b and the polarization splitting element 260. The combining unit 280 polarizes the light beams generated by the first and second light sources 231a and 231b into first and second polarized lights 203a and 203b having different polarization directions, 1 and the second polarized light 203a and 203b. Referring to this figure, the first and second polarized lights 203a and 203b are S wave and P wave, respectively.

The combining unit 280 includes first and second polarizing elements 281a and 281b and a combined polarized light separating element 282. [

The first and second polarizing elements 281a and 281b are formed to polarize light generated by the first and second light sources 231a and 231b to the first and second polarized lights 203a and 203b, respectively. The polarizing elements 281a and 281b are formed by combining polarizing beamsplitter (PBS) and half wave plate (HWP) to convert unpolarized light into first or second polarized light 203a or 203b Lt; / RTI > The polarizing elements 281a and 281b may be, for example, PCS elements.

The composite polarized light separation element 282 is arranged such that the first and second polarized lights 203a and 203b are respectively incident thereon. More specifically, the composite polarized light separating element 282 receives first and second polarized lights 203a and 203b polarized in the first and second polarizing elements 281a and 281b, respectively, The first and second polarizers 203a and 203b are combined to advance to the polarized light separating element 260. [

The composite polarized light separating element 282 is formed so that one of the first and second polarized lights 203a and 203b is reflected and the other is transmitted. For example, a polarizing beam (PBS) Splitter. Specifically, the S polarized light separating element 282 reflects the S wave to the polarized light separating element 260, and the P wave transmits the polarized light separating element 260.

The S polarization and the P wave synthesized by the composite polarization separation element 282 are arranged between the first image forming section 240 and the second image forming section 250 And are reflected and transmitted toward the first and second image forming units 240 and 250, respectively.

The first and second image forming units 240 and 250 form different images such as a left eye and a right eye using the S wave and the P wave, respectively. The polarization states of the formed images are converted into P wave and S wave, Conversion. The images formed by the first and second image forming units 240 and 250 are synthesized again by the polarization splitter 260 and projected onto the same optical path. As described above, the stereoscopic image projection apparatus 200 in which the brightness of the image projected by the optical system 230 using the plurality of light sources 231a and 231b is increased is realized.

Referring to FIG. 3, the first and second light sources 231a and 231b are disposed parallel to each other, and the stereoscopic image projecting apparatus 200 may include a mirror 290. FIG. The mirror 290 reflects any one of the first and second polarized lights 203a and 203b emitted from any one of the first and second polarizing elements 281a and 281b toward the combined polarized light separating element 282 Respectively.

The first light source 231a is disposed to face the mirror 290. That is, the mirror 290 is disposed between the first light source 231a and the composite polarized light separation element 282. The second light source 231b is located farther from the first polarized light separation element 282 in the parallel direction than the first light source 231a. Accordingly, when combining the light beams focused by the first and second illumination optical element groups 232a and 232b, the path of light can be made identical.

The stereoscopic image projection apparatus is not limited to the configuration and method of the embodiments described above, but all or some of the embodiments may be selectively combined so that various modifications may be made to the embodiments.

1 is a perspective view of a stereoscopic image display system according to an embodiment of the present invention;

2A and 2B are perspective views of the image projection apparatus of FIG. 1 viewed from the front and rear, respectively.

3 is an exploded view of the image projection apparatus of FIG.

4 is a conceptual diagram illustrating the optical system of FIG.

FIG. 5A is a conceptual diagram illustrating a process of forming an image in the optical system of FIG. 3; FIG.

5B is a conceptual diagram illustrating a projection process of an image in the optical system of FIG.

6 is a conceptual diagram showing an optical system applied to another embodiment of a stereoscopic image projection apparatus according to the present invention.

Claims (13)

A light source for generating light; A display device for forming a left eye image using the first polarized light and converting the polarization direction of the left eye image and a reflection element for reflecting the left eye image with the polarization direction converted to the incident path of the first polarized light, 1 image forming unit; A second image forming unit which forms a right eye image using a second polarized light having a polarization direction different from that of the first polarized light and converts the right-eye image into the first polarized light and reflects the right-eye image toward the incident path of the second polarized light; And Wherein the first and second polarized lights are separated from each other by the first polarized light and the second polarized light and are incident on the first and second image forming parts, respectively, And a polarized light separating element disposed between the light source, the first image forming section and the second image forming section so as to synthesize reflected left eye and right eye images, The display device includes a blue display device, a green display device, and a red display device to form the left eye image using polarized light corresponding to three primary colors, Wherein the first polarized light is incident along one direction and is separated into the three primary colors to transmit any one of the three primary colors so as to be directed to the blue display device, the green display device and the red display device, The stereoscopic image projecting device comprising: delete delete The method according to claim 1, The polarized light separating element comprises: An incidence portion through which the light is incident; A separator for separating the light into the first and second polarized lights by reflecting one of the first and second polarized lights and transmitting the other polarized light; First and second entrance portions in which the first and second polarized lights propagate toward the first and second image forming portions respectively and the left eye and right eye images are incident from the first and second image forming portions, respectively; And And an output unit for outputting the left eye and right eye images synthesized so as to face the same optical path in the separation unit. 5. The method of claim 4, Wherein the light source is disposed to face the incident portion, and the first and second image forming portions are disposed to face the first and second entrance portions, respectively. 5. The method of claim 4, And a projection lens disposed on the same optical path facing the emission unit and enlarging the left eye and right eye images. 5. The method of claim 4, And a polarization changing element mounted on the emitting unit and configured to convert the first and second polarized lights into circularly polarized light. The method according to claim 1, Wherein the light source includes first and second light sources, And a combining unit for synthesizing the lights generated from the first and second light sources and advancing the combined lights to the polarization splitting element. 9. The method of claim 8, The synthesizing unit, First and second polarizing elements for polarizing the light generated from the first and second light sources into the first and second polarized lights, respectively; And And first and second incident portions orthogonally intersecting with the first and second polarized lights respectively polarized in the first and second polarizing elements, wherein the first and second polarized lights incident on the first and second polarized elements are synthesized, And a synthesized polarized light separating element for causing the light to pass through the device. 10. The method of claim 9, Further comprising a mirror for reflecting one of the first and second polarized lights emitted from any one of the first and second polarizing elements toward the combined polarized light separating element. 11. The method of claim 10, Wherein the first and second light sources are parallel to each other and the first light source is disposed to face the mirror and the second light source is positioned farther from the synthetic polarization separation element with respect to the parallel direction than the first light source The stereoscopic image projecting device comprising: First and second light sources for generating light; A combining unit for polarizing the light beams generated from the first and second light sources into first and second polarized lights having different polarizing directions, respectively, and combining the first and second polarized lights to travel through the same path; First and second image forming units for forming different images using the first and second polarized lights, respectively, and converting the polarization states of the formed images into the second and first polarized lights, respectively; And Wherein the first polarized light and the second polarized light are separated from each other and are incident on the first and second image forming units, And a first polarization splitting element disposed between the combining unit, the first image forming unit, and the second image forming unit to combine the images formed by the first and second image forming units, The first image forming unit includes a display device for forming a left eye image using the first polarized light and converting the polarization direction of the left eye image, And a reflection element The display device includes a blue display device, a green display device, and a red display device to form the left eye image using polarized light corresponding to three primary colors, Wherein the first polarized light is incident along one direction and is separated into the three primary colors to transmit any one of the three primary colors so as to be directed to the blue display device, the green display device and the red display device, The stereoscopic image projecting device comprising: 13. The method of claim 12, The synthesizing unit, First and second polarizing elements for polarizing the light generated from the first and second light sources into the first and second polarized lights, respectively; And And a second polarized light separating element arranged such that the first and second polarized lights are incident on the first polarized light separating element so that the first and second polarized lights are incident on the first polarized light separating element.

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