TW201515431A - Stereoscopic projection apparatus - Google Patents

Abstract

A stereoscopic projection apparatus including a screen, a projector, a phase retarder and a view zone producer is provided. The projector is adapted to provide a first polarized light traveling toward the screen and the first polarized light has a first polarization state. The phase retarder is disposed on the traveling path of the first polarized light and located between the screen and the projector. The first polarized light passes through the phase retarder and is reflected by the screen. The reflected first polarized light further passes through the phase retarder to form a second polarized light having a second polarization state orthogonal to the first polarization state. The view zone producer is disposed on the traveling path of the second polarized light, wherein the second polarized light travels along specified paths to form different images within a plurality of view zones after passing through the view zone producer.

Description

Stereoscopic projection device

The present invention relates to a projection device, and more particularly to a stereoscopic projection device.

In recent years, with the maturity of display technology and the pursuit of more realistic and richer visual enjoyment, the development of electronic goods and technology in the field of three-dimensional image display is booming. On the other hand, since the projection device can provide a large-sized display screen with a small volume, and for a plurality of people to simultaneously view the display content on the screen, and can be further widely applied to various types of home, business, travel, games, actions, and the like. In the field of life. Therefore, the stereoscopic image projection display device has also become one of the products actively developed in the related art.

At present, the technology applied to the stereoscopic image projection system on the market can be divided into a shutter glasses type stereo display technology and a polarized glasses type stereo display technology. However, regardless of the above techniques, the user must wear stereo glasses to view the stereoscopic image. As a result, it is not convenient for the user, and the user often feels uncomfortable after watching the stereoscopic image for a long time.

The invention provides a stereoscopic projection device, which has the convenience of not having to match stereoscopic glasses to view stereoscopic images.

The stereoscopic projection device of the present invention comprises a screen, a projector, a phase retarder and a view generating sheet. The projector is adapted to provide a first polarized beam toward the screen, and the first polarized beam has a first polarization state. The phase retarder is located on the transmission path of the first polarized beam and between the screen and the projector. The first polarized beam passes through the phase retarder and enters the screen, and is reflected by the screen and passes through the phase retarder again to form a second polarized beam. The second polarized beam has a second polarization state and the second polarization state is orthogonal to the first polarization state. The field of view generation sheet is located on the transmission path of the second polarized beam. The second polarized beam is generated by the specified path after passing through the field of view to form different images in multiple fields of view.

In an embodiment of the invention, the view generating sheet has a plurality of first regions and a plurality of second regions, and the absorption axes of the first regions and one of the second regions are parallel to the second polarization state. And the other of the first regions and the second regions are adapted to allow the second polarized beam to penetrate.

In an embodiment of the invention, the first region and the second region provide substantially the same transmittance for the first polarized beam.

In an embodiment of the invention, the first region and the second region are alternately arranged.

In an embodiment of the invention, the view generating sheet further includes a plurality of polarization patterns and a plurality of optical compensation patterns, wherein the areas of the polarization patterns are In an area, the areas of these optical compensation patterns are these second areas.

In an embodiment of the invention, the view generating sheet includes a plurality of microlens units, and each of the microlens units provides a transmissive effect on the first polarized beam and a refractive effect on the second polarized beam.

In an embodiment of the invention, there is a first spacing between the view generating sheet and the phase retarder.

In an embodiment of the invention, there is a second spacing between the phase retarder and the screen.

In an embodiment of the invention, the view generating sheet includes a first material layer and a second material layer, and the first material layer and the second material layer respectively respectively pair the first polarized light beam and the second polarized light The light beam provides a first index of refraction and a second index of refraction, and the other of the first material layer and the second material layer provides a first index of refraction for both the first polarized beam and the second polarized beam.

In an embodiment of the invention, there is an interface between the first material layer and the second material layer, and the interface is not parallel to the screen.

In an embodiment of the invention, the projector includes a projection lens and a polarizer. A projection lens adapted to provide an image beam. A polarizing plate is disposed on the transmission path of the image beam, wherein the image beam passes through the polarizing plate to form a first polarized beam.

In an embodiment of the invention, the first polarized beam passes through the phase retarder to form a first circularly polarized beam, and the first circularly polarized beam is reflected by the screen to form a second circularly polarized beam, the first circularly polarized beam. Rotation with the second circularly polarized beam The directions of rotation are opposite to each other, and after the second circularly polarized beam is again incident on the phase retarder, a second polarized beam is formed.

In an embodiment of the invention, the screen is a screen that does not resolve the polarization state.

Based on the above, the stereoscopic projection device of the embodiment of the present invention uses a projector to provide an image and a phase retarder and a view generating sheet are disposed in front of the projector to form different images in a plurality of fields of view. In this way, the stereoscopic projection device of the embodiment of the present invention can allow the user to view the stereoscopic image without wearing the stereo glasses, and has the convenience of viewing the stereoscopic image, and helps to avoid the user's long-term matching. Discomfort caused by wearing stereo glasses.

The above described features and advantages of the invention will be apparent from the following description.

40a, 40b‧‧‧ eyes

50‧‧‧Image beam

60a, 60b‧‧‧ first polarized beam

70a, 70b‧‧‧ first circularly polarized beam

80a, 80b‧‧‧ second circularly polarized beam

90a, 90b‧‧‧second polarized beam

100, 200, 700‧‧‧ stereo projection device

110‧‧‧ screen

120‧‧‧Projector

121‧‧‧Projection lens

122‧‧‧Polarizer

130‧‧‧ phase retarder

140, 240, 340, 440, 540, 640, 740 ‧ ‧ Sight generation

240a, 440a, 540a, 640a‧‧‧ first material layer

240b, 440b, 540b, 640b‧‧‧ second material layer

2411, 341, 441, 541, 641, 741‧‧‧ microlens units

S1‧‧‧ first area

S2‧‧‧Second area

PL‧‧‧polarization pattern

CL‧‧‧Optical compensation pattern

N1‧‧‧first refractive index

N2‧‧‧second refractive index

G1‧‧‧ first spacing

G2‧‧‧Second spacing

VZ1, VZ2‧‧ Sight

O1, O2‧‧‧ absorption axis

W‧‧‧ distance

IS, PS‧‧‧ interface

D1‧‧‧first polarization state

D2‧‧‧Second polarization state

C1‧‧‧First circular polarization state

C2‧‧‧Second circular polarization state

FIG. 1A is a schematic structural diagram of a stereoscopic projection apparatus according to an embodiment of the invention.

1B is a schematic view of an optical path of light emitted by a projector in the stereoscopic projection device of the embodiment of FIG. 1A.

1C is a schematic view of an optical path of image light in the stereoscopic projection device of the embodiment of FIG. 1A.

Figure 1D is a schematic cross-sectional view of a field of view generation sheet of the embodiment of Figure 1A.

Figure 1E is a schematic illustration of the optical path of the beam passing through the field of view generation of the embodiment of Figure 1A.

2A is a schematic structural diagram of a stereoscopic projection device according to another embodiment of the present invention.

2B is a schematic view of the optical path of a view generating sheet of the embodiment of FIG. 2A.

2C is a schematic view of an optical path of light emitted by the projector in the stereoscopic projection device of the embodiment of FIG. 2A.

2D is a schematic view of the optical path of image light in the stereoscopic projection device of the embodiment of FIG. 2A.

3A is a schematic cross-sectional view of another view generating sheet of the embodiment of FIG. 2A.

FIG. 3B is a schematic diagram of an optical path of image light generated by applying the viewing zone generating sheet of FIG. 3A to the stereoscopic projection device. FIG.

4A is a cross-sectional view showing still another view generating sheet of the embodiment of FIG. 2A.

4B is a schematic diagram of an optical path of image light generated by applying the viewing zone generating sheet of FIG. 4A to the stereoscopic projection device.

Figure 5A is a cross-sectional view showing still another view generating sheet of the embodiment of Figure 2A.

FIG. 5B is a schematic diagram of an optical path of image light generated by applying the viewing zone generating sheet of FIG. 5A to the stereoscopic projection device. FIG.

Figure 6A is a cross-sectional view showing still another view generating sheet of the embodiment of Figure 2A.

FIG. 6B is a schematic diagram of an optical path of image light generated by applying the viewing zone generating sheet of FIG. 6A to the stereoscopic projection device. FIG.

FIG. 7 is a schematic structural diagram of a stereoscopic projection apparatus according to still another embodiment of the present invention.

FIG. 1A is a schematic structural diagram of a stereoscopic projection apparatus according to an embodiment of the invention. 1B is a schematic view of an optical path of light emitted by a projector in the stereoscopic projection device of the embodiment of FIG. 1A. 1C is a schematic view of an optical path of image light in the stereoscopic projection device of the embodiment of FIG. 1A. Referring to FIG. 1A to FIG. 1C , in the embodiment, the stereoscopic projection device 100 includes a screen 110 , a projector 120 , a phase retarder 130 , and a viewing area generating sheet 140 . Specifically, in the present embodiment, the projector 120 includes a projection lens 121 and a polarizing plate 122, and the projector 120 is adapted to provide a first polarized light beam 60a, 60b (as shown in FIG. 1B) toward the screen 110. To make a different image beam 50 of a user's right eye 40a and left eye 40b, respectively. In this embodiment, the projector 120 can be, for example, a digital light processing (DLP) projection system, but the invention is not limited thereto. In detail, the projection lens 121 is adapted to provide an image beam 50, and the polarizer 122 is located on the transmission path of the image beam 50. Since the polarizer 122 has an absorption axis O1, the image beam 50, after passing through the polarizer 122, will form the first polarized beams 60a, 60b. Here, the first polarized light beams 60a, 60b are, for example, a linearly polarized light and have a first polarization state D1, wherein the polarization direction of the first polarization state D1 is perpendicular to the absorption axis O1. In the content illustrated in FIG. 1B, the absorption axis O1 is, for example, a direction perpendicular to the paper surface, and the polarization direction of the first polarization state D1 is parallel to the paper surface and directed in the upper and lower directions of the drawing.

On the other hand, referring to FIG. 1B and FIG. 1C, in the present embodiment, the phase retarder 130 is located on the transmission path of the first polarized light beams 60a, 60b and between the screen 110 and the projector 120. In the present embodiment, the phase retarder 130 is, for example It may be composed of a phase retardation material such as a liquid crystal material, and may provide a phase retardation of a quarter wavelength to the first polarized light beams 60a, 60b. As a result, after the first polarized beams 60a, 60b pass through the phase retarder 130, the polarization states of the first polarized beams 60a, 60b will change to form a first circularly polarized beam 70a, 70b, wherein the first circular polarization The beams 70a, 70b have a first circular polarization state C1 as shown in Figure 1C.

Next, as shown in FIG. 1C, the first circularly polarized light beams 70a, 70b are incident on the screen 110 and reflected by the screen 110 to form a second circularly polarized light beam 80a, 80b having a second circular polarization state C2. In more detail, in the present embodiment, the screen 110 is, for example, a screen that does not resolve the polarization state. For example, the screen 110 may be a screen coated with a metal reflective layer or a screen with silver glue attached to the surface to avoid a change in the polar state of the screen 110. In other words, after being reflected by the screen 110, the light beam having a circular polarization state is still circularly polarized light. On the other hand, however, since the screen 110 will reflect the first circularly polarized beams 70a, 70b, it will still change its direction of rotation to form the second circularly polarized beams 80a, 80b, and the first circularly polarized beams 70a, 70b The directions of rotation with the second circularly polarized beams 80a, 80b are opposite to each other.

Thereafter, as also shown in FIG. 1C, when the second circularly polarized light beams 80a, 80b are again incident on the phase retarder 130, the phase retarder 130 also provides a quarter-wavelength phase delay to the second circularly polarized light beams 80a, 80b. . As a result, after the second circularly polarized light beams 80a, 80b are again incident on the phase retarder 130, a second polarized light beam 90a, 90b is formed. More specifically, the second polarized light beams 90a, 90b are linearly polarized light having a second polarization state D2, and the polarization directions of the second polarization state D2 and the first polarization state D1 are orthogonal to each other.

In addition, referring to FIG. 1C, in the present embodiment, the viewing zone generating sheet 140 is located on the transmission path of the second polarized light beams 90a, 90b. Specifically, after the second polarized light beams 90a, 90b pass through the viewing zone to generate the slice 140, they will be emitted by the specified path to provide different view images for different views VZ1 and VZ2, and define multiple views VZ1. , VZ2. In this way, the stereoscopic projection device 100 will enable a user's right eye 40a and left eye 40b to view different view images to achieve a stereoscopic effect. The structure design of the viewing zone generating sheet 140 and the formation mechanism of the viewing zones VZ1 and VZ2 will be further described below with reference to FIG. 1D and FIG. 1E.

1D is a partial cross-sectional view of a view generating sheet of the embodiment of FIG. 1A. Figure 1E is a schematic illustration of the optical path of the beam passing through the field of view generation of the embodiment of Figure 1A. Referring to FIG. 1C to FIG. 1E, in the present embodiment, the viewing zone generating sheet 140 is, for example, a patterned polarizing plate. Specifically, in the present embodiment, the viewing area generating sheet 140 has a plurality of first areas S1 and a plurality of second areas S2, wherein the first areas S1 and the second areas S2 are alternately arranged. Further, one of the first region S1 and the second region S2 has an absorption axis O2 that is parallel to the second polarization state, and the other of the first region S1 and the second region S2 is adapted to allow the second polarized light beam 90a, 90b penetration. Therefore, by the arrangement of the view generating sheet 140, the first region S1 and the second region S2 can provide different optical effects to further form different images in the plurality of viewing zones VZ1, VZ2.

Further, in the embodiment, the view generating sheet 140 includes a plurality of polarization patterns PL and a plurality of optical compensation patterns CL respectively located in the first region S1 and the second regions S2, such that the first regions S1 With these second areas S2 can provide different optical effects of the second polarized beams 90a, 90b, respectively. For example, in the embodiment, the area of the polarization pattern PL is the first area S1, and the area of the optical compensation pattern CL is the second area S2, but the invention is not limited thereto. In other embodiments, the area of the polarization pattern PL may also be the second area S2, and the area of the optical compensation pattern CL may be the first area S1, and the viewing area generating sheet 140 may have a similar effect.

Specifically, as shown in FIG. 1B, in the present embodiment, these polarization patterns PL may have, for example, a light absorption axis O2 parallel to the second polarization state D2, thereby providing absorption of the second polarized light beams 90a, 90b. So that the second polarized light beams 90a, 90b incident on these first regions S1 are absorbed. As such, the polarization pattern PL of the first region S1 can block the passage of the second polarized light beams 90a, 90b, providing a function similar to a light barrier pattern, such that the user's right eye 40a and left eye 40b see differently. The image, thereby defining a plurality of viewing zones VZ1, VZ2, achieves a stereoscopic display effect, as shown in FIG. 1C. On the other hand, since the distance W between the right eye 40a and the left eye 40b of the general user has an approximate range, in general, the design of the widths of the respective viewing areas VZ1 and VZ2 is also based on the range distance W. The right eye 40a and the left eye 40b of the user can be positioned in different fields of view VZ1, VZ2.

Furthermore, the transmittances provided by the first region S1 and the second regions S2 to the first polarized light beams 60a, 60b are substantially the same. In other words, these polarization patterns PL and these optical compensation patterns CL will provide the same transmittance for the first polarized light beams 60a, 60b. For example, in the present embodiment, the transmittances provided by the polarization pattern PL and the optical compensation pattern CL for the first polarized light beams 60a, 60b are, for example, 80~90%. As such, when the first polarized light beams 60a, 60b are incident on the phase retarder 130 through the field of view generating sheet 140, the uniform brightness will still be maintained, and thus the second polarized light beams 90a, 90b formed thereafter will also be uniform. Brightness. In this way, the brightness of each view image does not appear to fall, but affects the stereoscopic effect. In other words, the stereoscopic projection device 100 of the present embodiment can provide a stereoscopic image with good image quality. It should be noted that the above various parameters are merely illustrative and are not intended to limit the invention.

In the embodiment of FIG. 1A, the structural design of the viewing zone generating sheet 140 is described by taking a patterned polarizing plate as an example, but the invention is not limited thereto. In other embodiments, the view generating sheet 140 can also perform structural design using other optical members that can provide different optical effects, while still allowing the stereoscopic projection device 100 to produce a stereoscopic effect. The possible variations of the view generating sheet 140 will be further described below in conjunction with FIGS. 2A through 7.

2A is a schematic structural diagram of a stereoscopic projection device according to another embodiment of the present invention. 2B is a schematic view of the optical path of a view generating sheet of the embodiment of FIG. 2A. Referring to FIGS. 2A and 2B, the stereoscopic projection device 200 of the present embodiment is similar to the stereoscopic projection device 100 of the embodiment of FIG. 1A, and the differences are as follows. In the present embodiment, the viewing area generating sheet 240 of the stereoscopic projection device 200 includes a plurality of microlens units 241, and the microlens unit 241 will provide different colors for the first polarized light beams 60a, 60b and the second polarized light beams 90a, 90b, respectively. Optical effect. More specifically, the microlens unit 241 can provide direct transmission to the first polarized light beams 60a, 60b and provide refraction to the second polarized light beams 90a, 90b.

In detail, as shown in FIG. 2B, in the embodiment, the viewing zone generating sheet 240 may be composed of a first material layer 240a and a second material layer 240b, wherein the first material layer 240a and the second material layer There is an interface IS between 240b, and the interface IS is not parallel to the screen 110. Specifically, one of the first material layer 240a and the second material layer 240b provides a first refractive index n1 and a second refractive index n2 to the first polarized light beams 60a, 60b and the second polarized light beams 90a, 90b, respectively. And the other of the first material layer 240a and the second material layer 240b provides a first refractive index n1 for the first polarized light beams 60a, 60b and the second polarized light beams 90a, 90b. In other words, in the present embodiment, the first material layer 240a is a refractive index material having an anisotropic property.

For example, in this embodiment, the first material layer 240a provides a first refractive index n1 and a second refractive index n2 to the first polarized light beams 60a, 60b and the second polarized light beams 90a, 90b, respectively, and second. The material layer 240b provides a first index of refraction n1 for both the first polarized beams 60a, 60b and the second polarized beams 90a, 90b. As such, as shown in FIG. 2B, when the first polarized light beams 60a, 60b pass through the field of view to produce the sheet 240, they will not be deflected, but will be transmitted directly out of the field of view generating sheet 240. However, when the second polarized light beams 90a, 90b pass through the field of view generating sheet 240, then the second polarized light beams 90a, 90b will be due to the interface IS being non-parallel to the screen 110 and the first material layer 240a and the second material layer 240b. The refractive index is different and a deflection occurs.

Further, in more detail, in the present embodiment, the first refractive index n1 is smaller than the second refractive index n2, and the interface IS constitutes a center in each of the microlens units 241 that is farther from the screen 110 and the edge is closer to the screen 110. Curved surface. Therefore, the incident field of view produces a refraction phenomenon in which the second polarized light beams 90a, 90b of the sheet 240 converge. change In other words, as shown in FIG. 2B, the plurality of microlens units 241 of the viewing area generating sheet 240 will provide a deflecting effect on the incident second polarized light beams 90a, 90b, thereby forming different images in multiple fields of view. . 2C and 2D, the mechanism for how the microlens unit 241 forms different images in a plurality of fields of view will be further described.

2C is a schematic view of the optical path of light emitted by the projector in the stereoscopic projection device of the embodiment of FIG. 2A. 2D is a schematic view of the optical path of image light in the stereoscopic projection device of the embodiment of FIG. 2A. Referring to FIG. 2C and FIG. 2D, in the present embodiment, since the microlens unit 241 can provide a convergent refraction effect on the incident second polarized light beams 90a, 90b, the second polarized light beam 90a of the sheet 240 is generated through the field of view, 90b will fall in different fields of view VZ1, VZ2. Specifically, in the present embodiment, the focal length of the microlens unit 241 can be adjusted such that the normal incidence field of view produces the sheet 240 and the second polarized light beam 90a, 90b having the second polarization state D2 forms a different view. The domain image can be focused and imaged on the screen 110. According to the design principle of the lenticular lens in the stereoscopic display, when the light vertically inserted into the lenticular lens can be focused on the screen, the viewer can view the clear stereoscopic image.

In addition, since the viewing zone generating sheet 240 of the present embodiment only provides a deflecting effect on the second polarized light beams 90a, 90b, and does not block the passage of the partial second polarized light beams 90a, 90b, the stereoscopic projection device 200 will be More good light utilization efficiency. It should be noted that, in this embodiment, although the interface IS is exemplified by a curved surface, the present invention is not limited thereto. The possible changes in the interface IS will be further described below in conjunction with FIGS. 3A and 3B.

Figure 3A is a cross-sectional view showing another view generating sheet of the embodiment of Figure 2A. Figure. FIG. 3B is a schematic diagram of an optical path of image light generated by applying the viewing zone generating sheet of FIG. 3A to the stereoscopic projection device. FIG. Referring to FIGS. 3A and 3B, the viewing zone generating sheet 340 of the present embodiment is similar to the viewing zone generating sheet 240 of the embodiment of FIG. 2A, and the differences are as follows. In the present embodiment, the interface PS in the microlens unit 341 of the viewing zone generating sheet 340 may be composed of, for example, a plurality of planes having different slopes. As such, as shown in FIG. 3B, the viewing zone generating sheet 340 will also have an effect similar to the viewing zone generating sheet 240, and can provide refraction to the incident second polarized light beams 90a, 90b, thereby forming an image thereon. Multiple views. When the view generating sheet 340 is applied to the stereoscopic projection device 200, the stereoscopic projection device 200 will still have the aforementioned functions and advantages, and will not be described again.

On the other hand, it should be noted that, in the embodiment of FIG. 2B and FIG. 3A described above, the microlens units 241 and 341 can provide a refractive refraction effect on the incident second polarized light beams 90a and 90b as an example. However, the invention is not limited thereto. In other embodiments, the refractive index difference between the first material layer 240a and the second material layer 240b for different polarization states can be modulated, so that the microlens units 241 and 341 can provide different types of refraction. effect. The following description will be further described with reference to FIGS. 4A and 4B.

4A is a cross-sectional view showing still another view generating sheet of the embodiment of FIG. 2A. 4B is a schematic diagram of an optical path of image light generated by applying the viewing zone generating sheet of FIG. 4A to the stereoscopic projection device. Referring to FIGS. 4A and 4B, the viewing zone generating sheet 440 of the present embodiment is similar to the viewing zone generating sheet 240 of the embodiment of FIG. 2A, and the differences are as follows. In this embodiment, the first material layer 440a of the viewing zone generating sheet 440 is opposite to the first polarized light beam 60a, 60b and the second polarized light beams 90a, 90b each provide a first refractive index n1, and the second material layer 440b provides a first refractive index n1 and a second refractive index to the first polarized light beams 60a, 60b and the second polarized light beams 90a, 90b, respectively. The rate is n2. In other words, in the present embodiment, the second material layer 440b is a refractive index material having an anisotropic property. Since the first refractive index n1 is smaller than the second refractive index n2 in the present embodiment, as shown in FIG. 4A, the microlens unit 441 at this time will refract the incident second polarized light beams 90a, 90b. . As such, as shown in FIG. 4B, the plurality of microlens units 441 of the viewing zone generating sheet 440 will also provide a deflecting effect on the incident second polarized light beams 90a, 90b, thereby forming different viewing angle images. One of the fields of view VZ1, VZ2. When the view generating sheet 440 is applied to the stereoscopic projection device 200, the stereoscopic projection device 200 will also have the aforementioned functions and advantages, and will not be described again.

On the other hand, it should be noted that, in the foregoing embodiments of FIG. 2B and FIG. 4A, although the interface IS is formed in each microlens unit 241 (441), the center is farther from the screen 110 and the edge is closer to the screen 110. The case of the curved surface (i.e., the concave surface of each microlens unit 241 (441) faces the screen 110) is exemplified, but the invention is not limited thereto. The following description will be further described with reference to FIGS. 5A to 6B.

Figure 5A is a cross-sectional view showing still another view generating sheet of the embodiment of Figure 2A. FIG. 5B is a schematic diagram of an optical path of image light generated by applying the viewing zone generating sheet of FIG. 5A to the stereoscopic projection device. FIG. Referring to FIGS. 5A and 5B, the viewing zone generating sheet 540 of the present embodiment is similar to the viewing zone generating sheet 240 of the embodiment of FIG. 2A, and the differences are as follows. In the present embodiment, the interface IS constitutes an arcuate face in the center of each of the microlens units 541 that is closer to the screen 110 and has an edge farther from the screen 110. In other words, in this embodiment, each The convex surface of the microlens unit 541 faces the screen 110. On the other hand, in the present embodiment, since the first material layer 540a of the viewing zone generating sheet 540 is a refractive index material having an opposite direction (that is, the first material layer 540a is opposite to the first polarized light beams 60a, 60b and the second The polarized light beams 90a, 90b provide a first refractive index n1 and a second refractive index n2, and the second material layer 540b provides a first refractive index n1 for the first polarized light beams 60a, 60b and the second polarized light beams 90a, 90b. And the first refractive index n1 is smaller than the second refractive index n2, so that as shown in FIG. 5B, the microlens unit 541 at this time will cause a refraction phenomenon in which the incident second polarized light beams 90a, 90b are diverged.

Figure 6A is a cross-sectional view showing still another view generating sheet of the embodiment of Figure 2A. FIG. 6B is a schematic diagram of an optical path of image light generated by applying the viewing zone generating sheet of FIG. 6A to the stereoscopic projection device. FIG. Referring to FIGS. 6A and 6B, the viewing area generating sheet 640 of the present embodiment is similar to the viewing area generating sheet 440 of the embodiment of FIG. 4A, and the differences are as follows. In the present embodiment, the interface IS constitutes an arcuate face in the center of each of the microlens units 641 that is closer to the screen 110 and whose edge is farther from the screen 110. In other words, in the present embodiment, the convex surface of each microlens unit 641 faces the screen 110. On the other hand, in the present embodiment, since the second material layer 640b of the viewing zone generating sheet 640 is a refractive index material having an anisotropic property (that is, the first material layer 640a is opposite to the first polarized light beams 60a, 60b and the second The polarized light beams 90a, 90b each provide a first refractive index n1, and the second material layer 640b provides a first refractive index n1 and a second refractive index n2) to the first polarized light beams 60a, 60b and the second polarized light beams 90a, 90b, respectively. Further, since the first refractive index n1 is smaller than the second refractive index n2, as shown in FIG. 6B, the microlens unit 641 at this time refracts a phenomenon in which the incident second polarized light beams 90a, 90b converge.

In addition, in the embodiments of FIGS. 2B, 3A, 4A, 5A, and 6A, the case where the first refractive index n1 is smaller than the second refractive index n2 is exemplified, but The invention is not limited to this. In other embodiments, the first refractive index n1 may also be greater than the second refractive index n2. In the case where the first refractive index n1 is greater than the second refractive index n2, the structure of the aforementioned microlens units 241, 341, 641 will cause a refractive phenomenon in which the incident second polarized light beams 90a, 90b are diverged, and the aforementioned microlens unit The structure of 441, 541 will cause the incident second polarized light beams 90a, 90b to converge to a refractive phenomenon.

In view of the above, due to the optical effects of the microlens units 241, 341, 441, 541, and 641, the incident second polarized light beams 90a, 90b can be deflected, thereby forming different images. In the field of view VZ1, VZ2, therefore, those skilled in the art can perform appropriate optical path design according to actual needs, and can achieve similar stereoscopic effects, which will not be described here.

FIG. 7 is a schematic structural diagram of a stereoscopic projection apparatus according to still another embodiment of the present invention. Referring to FIGS. 2A and 7, the stereoscopic projection device 700 of the present embodiment is similar to the stereoscopic projection device 200 of the embodiment of FIG. 2A, and the differences are as follows. In the present embodiment, a first pitch G1 will exist between the view generating chip 740 and the phase retarder 130, and a second pitch G2 may optionally exist between the phase retarder 130 and the screen 110. The first pitch G1 and the second pitch G2 may be adjusted according to the optical effect of the viewing zone generating sheet 740. For example, it can be seen from the foregoing embodiments that the viewing zone generating sheet 740 can provide a diverging or converging deflection effect on the second polarized light beams 90a, 90b. At this time, in order to achieve the desired image quality, the view field produces a slice 740 and a screen. The distance between the curtains 110 is preferably equal to the focal length associated with the deflection. Therefore, the adjustment of the first pitch G1 and the second pitch G2 can adjust the distance between the viewing zone generating sheet 740 and the screen 110 to a desired size. In this way, the stereoscopic projection device 700 of the present embodiment can have a desired display effect, and still retain the functions and advantages mentioned by the stereoscopic projection device 200 described above.

In summary, the stereoscopic projection device of the embodiment of the present invention uses a projector to provide images and has a phase retarder disposed in front of the projector and a view generating sheet in front of the projection screen to form different images in multiple fields of view. . In this way, the stereoscopic projection device of the embodiment of the present invention allows the user to view the stereoscopic image without wearing the stereo glasses, and has the convenience of viewing the stereoscopic image, and helps to prevent the user from wearing for a long time. Discomfort caused by stereo glasses.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧ Stereoscopic projection device

110‧‧‧ screen

120‧‧‧Projector

121‧‧‧Projection lens

122‧‧‧Polarizer

130‧‧‧ phase retarder

140‧‧‧Sight Producer

S1‧‧‧ first area

S2‧‧‧Second area

PL‧‧‧polarization pattern

CL‧‧‧Optical compensation pattern

O1‧‧‧ absorption axis

Claims (13)

A stereoscopic projection device comprising: a screen; a projector adapted to provide a first polarized light beam toward the screen, wherein the first polarized light beam has a first polarization state; and a phase retarder located at the first polarized light beam And a path between the screen and the projector, wherein the first polarized light beam passes through the phase retarder and enters the screen, and is reflected by the screen and passes through the phase retarder again to form a second polarization. a light beam, the second polarized light beam has a second polarization state, and the second polarization state is orthogonal to the first polarization state; and a field of view generating sheet is disposed on a transmission path of the second polarized light beam, wherein the The two polarized beams are generated by the field of view and emitted by the specified path to form different images in multiple fields of view. The stereoscopic projection device of claim 1, wherein the viewing zone generating sheet has a plurality of first regions and a plurality of second regions, and the absorption axes of the first regions and one of the second regions Parallel to the second polarization state, and the other of the first region and the second regions are adapted to allow the second polarized beam to penetrate. The stereoscopic projection device of claim 2, wherein the first regions and the second regions provide substantially the same transmittance for the first polarized light beam. The stereoscopic projection device of claim 2, wherein the first regions and the second regions are alternately arranged. The stereoscopic projection device of claim 2, wherein the viewing area generating sheet further comprises a plurality of polarization patterns and a plurality of optical compensation patterns, wherein the areas of the polarization patterns are the first areas, and the optical compensation The area of the pattern is the second area. The stereoscopic projection device of claim 1, wherein the viewing zone generating sheet comprises a plurality of microlens units, and each of the microlens units provides a transmissive effect on the first polarized light beam, and the second polarized light beam Provides refraction. The stereoscopic projection device of claim 6, wherein there is a first spacing between the viewing zone generating sheet and the phase retarder. The stereoscopic projection device of claim 6, wherein there is a second spacing between the phase retarder and the screen. The stereoscopic projection device of claim 6, wherein the viewing zone generating sheet comprises a first material layer and a second material layer, and the first material layer and the second material layer respectively The first polarized light beam and the second polarized light beam provide a first refractive index and a second refractive index, and the other of the first material layer and the second material layer is the first polarized light beam and the second polarized light The beams all provide the first index of refraction. The stereoscopic projection device of claim 9, wherein an interface exists between the first material layer and the second material layer, and the interface is not parallel to the screen. The stereoscopic projection device of claim 1, wherein the projector comprises: a projection lens adapted to provide an image beam; and a polarizer disposed on the transmission path of the image beam, wherein the image beam passes through the polarizer to form the first polarized beam. The stereoscopic projection device of claim 1, wherein the first polarized light beam passes through the phase retarder to form a first circularly polarized light beam, and the first circularly polarized light beam is reflected by the screen to form a second circle. The polarized light beam, the first circularly polarized light beam and the second circularly polarized light beam are opposite to each other, and the second circularly polarized light beam is incident on the phase retarder again to form the second polarized light beam. The stereoscopic projection device of claim 1, wherein the screen is a screen that does not resolve the polarization state.