FR2996315A1 - MULTI-PROJECTION SYSTEM AND DISPLAY SYSTEM USING THE MULTI-PROJECTION SYSTEM. - Google Patents

Abstract

The present invention relates to a multi-projection system and a display system using the same. The multi-projection system for projecting a plurality of images (200) included in a beam on a screen (207) comprises a beam source providing the beam; an image splitter (202) near the beam source and has a positive magnification ratio; and an imaging device (203, 204) in the vicinity of the image separator (202), wherein the beam passes through the image separator (202) and the imaging device (203, 204) to be projected on the screen (207).

Description

The present invention relates to a projection system and a display system using the projection system. More particularly, it relates to a multi-projection system and a display system using the same. In the state of the art, there are various architectures that have been realized concerning a multi-projection display system, which is capable of associating a series of multiple images that may depend on each other and are respectively projected from a single projector or a plurality of projectors on a screen in an image or continuous full image, to construct the plurality of images together during display. Alternatively, the multi-projection display system may also display a plurality of images that are independent of each other and are respectively projected from a single or a plurality of projectors on a screen, a game screens or any target region. In a conventional multi-projection display system, an optical engine equipped with an off-axis optical valve is commonly required to provide a beam carrying a plurality of images to be projected; refer to Fig. 1 (a) and Fig. 1 (b), which are, respectively, a schematic diagram illustrating a conventional multiprojection display system in top view on an xy plane and a schematic diagram illustrating multiple images displayed on a display surface of a conventional off-axis optical valve in an optical engine in a side view on a plane yz. The multi-projection display system 100 in Fig. 1 (a) comprises an optical engine (not shown) having an off-axis optical valve 105 for producing a beam carrying a plurality of images, a pair of X-type dichroic mirrors. comprising a first mirror 101 and a second mirror 102, a pair of projection mirrors comprising a third mirror 103 and a fourth mirror 104, and a screen 107. The off-axis optical valve 105 is used to form a beam 106 carrying two images, a image A appearing in the upper half portion in the beam 106 in front of a lens 110 and an image B appearing in the lower half portion in the beam 106 in front of the lens 110, which respectively come from the upper half region RA and the lower half region RB on the display surface on the off-axis optical valve 105, as shown in Fig. 1 (b). The first mirror 101 and the second mirror 102 are respectively used to separate the image A from the image B by independently reflecting the upper half part and the lower half part of the beam 106 respectively to the third mirror 103 and the fourth mirror 104, whereby the plurality of images A and B in the beam 106 are separated, so that the image A and the image B are respectively reflected to the third mirror 103 and the fourth mirror 104 and are finally represented on the screen 107, the first mirror 101 and the third mirror 103 being arranged at the same upper level above the same lower level where the second mirror 102 and the fourth mirror 104 are arranged.

The off-axis optical valve 105, as shown in detail in Fig. 1 (b), has a mechanical center axis 108 and an upper display region RA and a lower display region RB for respectively displaying images A and B intended to be synthesized in cooperation with a backlight in the form of a beam 106 carrying multiple images A and B. The beam 106 propagates through the lens 111 to be displayed on the screen 107. Each of the region upper display RA and a lower display region RB has an optical axis 109 and an optical axis 110 offset from the mechanical central axis 108. The off-axis optical valve 105 is usually a micro-display unit of FIG. image or a light processing unit, using several of the latest micro-display chips or digital light processing technologies, respectively, for example an array chip. digital micro-mirror device, a liquid crystal on silicon (LCoS) chip, and a liquid crystal display chip LCD). The images A and B will finally be combined into an integral image and shown on the screen 107, depending on each other, by the multi-projection display system. In order to precisely associate the two images A and B, the images A and B will be aligned with each other on both horizontal and vertical directions on the screen 107. However, because of the off-axis optical valve introduced in the multi-projection display system, the beam 106 emitted out of the off-axis optical valve 105 has substantially an optical angle relatively greater than that of an ordinary optical system not off-center or coaxial, which ensures that, to guarantee horizontal and vertical alignments for the images A and B, each of the mirrors 101, 102, 103 and 104 has two-dimensional inclinations and must be arranged as far as possible from the off-axis optical valve 105, resulting in an increase in width or the total height, and vice versa, for the multi-projection display system. In view of the disadvantages of the foregoing arts, it is necessary to solve the above deficiencies / problems.

The present invention provides an architecture for a multi-projection display system, which is also referred to as a multi-display projection system, and a display system using the architecture. The architecture proposed for a multi-projection display system has a relatively thin thickness or a relatively small width for the entire system compared to the same system in the prior art. In accordance with an aspect of the present invention, a display system for projecting a plurality of images included in a beam on a screen comprises an optical valve providing the beam; an image separator optically coupled to the optical valve and having a first optical axis and a positive magnification; and an optical imaging device optically coupled to the image splitter and having a second optical axis free from being coaxial with the first optical axis, wherein the beam from the optical valve passes through the splitter. image and the optical imaging device 10 to be projected on the screen. The positive magnification may be in the range of 1.0 to 5.0. According to a preferred feature, the display system according to the invention comprises a light source (703) providing a light and a light integrating rod (701) with a light input surface and an output surface of wherein the light source (703) is selected from a group consisting of a lamp (703p), a light-emitting diode, a laser and a combination thereof. According to another feature, the light source (703), the light integrating rod (701) and the optical valve (201) are configured so that the light emitted from the light source (703) 25 passes through the light integrating rod (701) by entering therefrom the light entry surface and exiting therefrom the light exit surface and propagating towards the optical valve (201) to form the beam , and the light integrating rod (701) functions to integrate and uniformize the light and to cause the light to be in an elliptical optical angle so that the beam entering the image separator (202, 502 , 603, 705) has a relatively small optical angle. According to yet another feature, the optical valve (201) is selected from a group consisting of a micro-mirror digital display chip, a silicon-on-silicon chip, and a transmissive liquid crystal display chip. and serves as an image display unit or a light processing unit for processing the plurality of images to be associated with the light in cooperation with the light source (703) and the integration rod (701) to form the beam comprising the plurality of images. According to another feature, the display system of the invention further comprises a first lens group (401) located on a first side near the optical valve (201) and a second lens group (402) located on a second side near the optical imaging device (203, 204, 604, 707). The first lens group (401) operates to realize a first convergence of the beam (404) and to separate the plurality of images in the beam into a state such that the plurality of images do not overlap in the beam, and the second group lens arrangement (402) operates to receive the beam and to realize a second convergence of the beam. Further, the first lens group (401) is selected from a group consisting of a positive lens, a negative lens and a combination thereof and the second lens group is selected from a group consisting of a positive lens, a negative lens and a combination thereof and coaxially disposed on the first optical axis (403, 601) with the first lens group (401). According to still other preferred features of the display system of the invention: the beam entering the optical imaging device (203, 204, 604, 707) correspondingly has a relatively small optical angle when the separator image (202, 502, 603, 705) has the positive magnification; the plurality of images are in one of a first state in which the plurality of images are independent of each other and a second state in which the plurality of images are dependent on one another; there is an offset displacement between the first optical axis (403, 601) and the second optical axis (602) so that the image separator (202, 502, 603, 705) and the optical imaging device (203, 204, 604, 707) are configured coaxially; there is a set of reflective elements (205, 500) between the image separator (202, 502, 603, 705) and the optical imaging device (203, 204, 604, 707) for dividing the beam from the image separator (202, 502, 603, 705) into a plurality of divided beams and to direct the plurality of divided beams into one of a plurality of optical imaging devices (203, 204, 604, 707). ).

The display system according to the present invention may be a rear projection display device.

According to one aspect of the present invention, a projection system for projecting a plurality of images included in a beam on a screen comprises a beam source providing the beam; an image splitter near the beam source, and has a positive magnification ratio; and an imaging device in the vicinity of the image separator, wherein the beam passes through the image separator and the imaging device to be projected onto the screen. In accordance with one aspect of the present invention, a projection system for projecting a plurality of images included in a beam from a beam source on a screen comprises an image separator between the beam source and the screen. and having a positive magnification. The present invention may be better understood from the following descriptions with reference to the accompanying drawings, in which: FIG. 1 (a) is a schematic diagram illustrating a conventional multi-projection display system in plan view from above xy; Fig. 1 (b) is a schematic diagram illustrating multiple images depicted on a display surface of a conventional off-axis optical valve in side view on a y-z plane; Fig. 2 is a schematic diagram illustrating a multi-projection display system viewed from above on an x-y plane in accordance with the present invention; FIGS. 3 (a) and 3 (b) are diagrammatic diagrams respectively illustrating a horizontally arranged type off-axis optical valve and an off-axis type optical valve arranged vertically in front view on a y-z plane in accordance with the present invention; Figure 4 is a schematic diagram illustrating a structure for an image separator in a side view on a y-z plane in accordance with the present invention; FIGS. 5 (a), 5 (b) and 5 (c) are schematic diagrams illustrating an illustrative configuration between the image separator and the optical imaging device in a top view on an xy plane in accordance with FIG. present invention; Figs. 6 (a) and 6 (b) are schematic diagrams illustrating a coaxial configuration mode for optically coupling the image separator 25 and the optical imaging device in side view on a y-z plane in accordance with the present invention; Figure 7 is a schematic diagram illustrating the multi-projection display system equipped with a light integration rod in accordance with the present invention.

The present invention will be described with respect to particular embodiments and with reference to certain drawings, but the invention is not limited thereto and is only limited by the claims. The drawings described are only schematic and are not limiting. In the drawings, the size of some of the elements may be exaggerated and not drawn to scale for illustrative purposes. The dimensions and relative dimensions do not necessarily correspond to reductions as such in practice. In addition, the terms "first", "second" and the like in the description and in the claims are used to distinguish between like elements and not necessarily to describe a sequence temporally, spatially, by classification or in any other way that it would be. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments described herein may operate in sequences other than those described or illustrated herein. In addition, the terms "up", "down", "upward", "downward", "over", "below" and the like in the description and claims are used for purposes descriptive and not necessarily to describe relative positions. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments described herein may operate in orientations other than those described or illustrated herein. It should be noted that the term "comprising", as used in the claims, should not be construed as being limited to the means listed immediately after; it does not exclude other elements or steps. It must thus be interpreted as specifying the presence of the specified features, integers, steps or components referred to, but does not exclude the presence or addition of one or more other features, integers, steps or components, or groups thereof. Thus, the scope of the phrase "a device comprising means A and B" should not be limited to devices consisting only of components A and B. The reference throughout this specification to "an embodiment" means that a particular feature, structure or feature described in combination with the embodiment is included in at least one embodiment. Thus, occurrences of the phrase "in one embodiment" at various locations throughout this specification are not necessarily all references to the same embodiment, but this is possible. In addition, particular features, structures or features may be combined in any suitable manner, as would be apparent to one of ordinary skill in the art from the present invention, in one or more embodiments.

Similarly, it should be appreciated that, in the description of illustrative embodiments, various features are sometimes grouped together in a single embodiment, in a single figure, or in a single description thereof for the purpose of simplification. the invention and to assist in the understanding of one or more of the various aspects of the invention. This method of invention, however, should not be interpreted as reflecting an intention that the claimed invention requires more features than those specifically stated in each claim. It should rather be understood, as the following claims reflect, that aspects of the invention do not necessarily require all the features of a single embodiment described above. Thus, the claims according to the detailed description are thus expressly incorporated in this detailed description, each claim being autonomous as a separate embodiment. In addition, although some embodiments described herein include some, but not all, of the features included in other embodiments, combinations of features of different embodiments are intended to be within the scope of the invention. the invention, and form different embodiments, as would be understood by those skilled in the art. For example, in the following claims, any of the claimed embodiments may be used in any combination. In the description provided herein, many specific details are presented. However, it is understood that embodiments may be practiced without these specific details. In other cases, well known methods, structures and techniques have not been presented in detail so as not to obscure an understanding of the present description. The invention will now be described through a detailed description of several embodiments. It is obvious that other embodiments may be configured according to the knowledge of those skilled in the art without departing from the true technical teaching of the present invention, the claimed invention being limited only by the terms of the above claims. attached. Fig. 2 is a schematic diagram illustrating a multi-projection display system in plan view on an x-y plane in accordance with the present invention. The multi-projection display system 200 in Fig. 2 is a display system for displaying digital media information with a projection of a plurality of images included in a beam on a screen 207 and includes an optical valve. 201, an image separator 202, optical imaging devices 203 and 204 (also referred to as secondary imaging devices or projection devices), a set of reflective dividers 205 and a set of reflective reflective elements 206 , the set of dividing reflective elements 205 comprising two dichroic mirrors 205a and 205b crossed with each other from top to bottom and the set of reflecting reflective elements 206 comprising two mirrors 206a and 206b which are preferably symmetrically configured. In one embodiment, the multi-projection display system 200 includes a multi-projection core. The multi-projection core comprises the optical valve 201, the image separator 202, the optical imaging devices 203 and 204, the set of dividing reflective elements 205 and the set of reflecting reflective elements 206. Certainly the Thus, the multi-projection core plus screen 207 forms the multi-projection display system 200. The multi-projection display system 200 is preferably a rear projection display system and, in In one embodiment, the multi-projection display system 200 is a front-projection display system. The image separator 202 is optically coupled to and between the optical valve 201 and the optical imaging devices 203 and 204, and receives a beam which carries a plurality of images and is produced by the optical valve 201 The plurality of images may be independent of one another or dependent on each other. The image separator 202 operates to separate the plurality of images in the beam into a state such that the plurality of images do not overlap in the beam and transmit the split image beam to the divider reflective element set 205. upper mirror 205a and a lower mirror 205b in the set of dividing reflective elements 205 are designed to divide the split-image beam into a plurality of divided beams under condition of maintaining the individual integrity for each of the plurality of images. At the same time, each of the mirrors 205a and 205b further directs one of the split beams carrying an integral image of the plurality of images in one of the optical imaging devices 203 and 204. Each of the optical imaging devices 203 and 204 provides functions relating to off-axis compensation, focal length change, chromatic aberration and error elimination, projection and focus settings to the divided beams and then transmits the adjusted beams to the set of reflective elements 206 by which the adjusted beams are projected on the screen 207. Finally, each of the integral images carried in the adjusted beams is respectively displayed on a different region of the screen 207. The multi-projection display system 200 further comprises a light source. The light source is preferably an ultra high pressure (UHP) lamp, a light emitting diode, a laser and operates to provide light. The optical image valve 201 processes the plurality of images to function as a display unit or light processing unit for being associated with the light in cooperation with the light source to form the beam comprising the light source. plurality of images and is preferably a digital micromirror display (DMD) chip, a liquid crystal on silicon (LCoS) chip and a microchip chip. transmissive liquid crystal display (LCD). Although the optical valve 201 is a DMD chip, there is a color wheel selectively disposed between the light source and the optical valve. As a result, the light emitted from the light source can be transformed into a beam carrying the plurality of images after passing through the optical valve, and the optical valve 201 is capable of providing a beam carrying a plurality of images. In one embodiment, the optical valve 201 is preferably an off-axis optical valve for providing the plurality of images. FIGS. 3 (a) and 3 (b) are diagrammatic diagrams respectively illustrating an offset type optical valve of horizontally arranged type and an off-axis type optical valve arranged vertically in front view on a y-z plane in accordance with the present invention. There are two types of off-axis optical valve, a horizontally arranged off-axis optical valve 301 and a vertically arranged off-axis optical valve 302 respectively shown in FIGS. 3 (a) and 3 (b), taken as control modes. illustrative embodiment to illustrate the off-axis optical valve to be included in the present invention. In Figures 3 (a) and 3 (b), the off-axis optical valves 301 and 302. have a mechanical central axis 303 and can provide multiple images 304 and 305, each of the multiple images 304 and 305 being separated from the others by a space distance G. The multiple images 304 and 305 have an optical axis 306 and an optical axis 307 respectively, each of the optical axes 306 and 307 being offset from the mechanical center axis 301 by a distance of an offset shift D. The multiple images 304 and 305 may be provided by the same micro display chip or multiple different micro-display chips, which means that the off-axis optical valve 302 (also called the optical valve 201) can be fabricated with a single chip, or two chips, or more.

Fig. 4 is a schematic diagram illustrating a structure for an image separator in side view on a y-z plane in accordance with the present invention. The image separator 202 in Fig. 4 has a first optical axis 403 and includes a first lens group 401 located on a first side (for example, a light valve side (LVS)) near the an optical valve 201 and a second lens group 402 located on a second side (for example, an optical imaging device side ("Optical Imaging Device Side" or OIS) near the optical imaging devices 203 and 204. The first group 401 lens is selected from a group consisting of a positive lens, a negative lens and a combination thereof and operates to achieve a first convergence of the beam 404 and separate the plurality of images II and 12 in the beam 404 in a state such that the plurality of images 11 and 12 do not overlap in the beam The second lens group 402 is also selected from a group consisting of a positive lens, a Negative lens and a combination thereof and operates to receive the separated image beam passing through the first lens group 401 and to achieve secondary convergence on the separate image beam. The first lens group 401 and the second lens group 402 are coaxially configured on the first optical axis 403. Finally, when the incident beam 404 leaves the image separator 202 as the outgoing beam, the plurality of images included in the outgoing beam 405 are separated and do not overlap. Briefly, the image separator 202 includes, but is not limited to, one or more lens groups that include a positive lens, a negative lens or a series of positive and negative lenses to provide a positive magnification ratio. and to separate the plurality of images in the beam. The positive magnification ratio, also referred to as positive magnification, is preferably in the range of zero to infinity, or preferably in the range of 1.0 to 3.0. In one embodiment, the image separator 202 may comprise only one lens which may be a positive or negative lens as long as it is capable of causing a positive magnification on the beam, preferably in a range of 1, 0 to 3.0, and to separate the plurality of images in the beam. Thus, the outgoing beam or the split image beam 405 for input to the optical imaging devices 203 and 204 has correspondingly a relatively small optical angle because the image separator 202 has the positive magnification, in accordance with FIG. an invariant theory of optical extension. Subsequently, the split image beam 405 is then transmitted to the set of dividing reflective elements 205. An upper mirror 205a and a lower mirror 205b forming a pair in the set 205 are configured to cross each other horizontally from top to bottom. upper mirror 205a crossing the lower mirror 205b with or without a physical intersection. The pair of mirrors 205a and 205b are arranged to receive the split image beam 405 and divide it into a plurality of divided beams, provided that each of the divided beams just carries a complete image of the plurality of images. Each of the optical imaging devices 203 and 204 has a second optical axis and is designed to provide off-axis compensation, zooming, chromatic aberration, and appropriate error elimination, projection, and debugging settings. on each of the divided beams transmitted from each of the pair of mirrors 205a and 205b. The set beams propagate to the pair of mirrors 206a and 206b to be projected on the screen 207 by them. . Finally, each of the integral images of the multiple misaligned images 304 and 305 which are vertically arranged in a vertically arranged off-axis optical valve 302, as shown in FIG. 3 (b), which may be independent or dependent on each other. Other, from the optical valve 201 and carried in the plurality of split, split and adjusted image beams, is finally projected onto the screen 207 and well combined with the other images on the screen 207 in a horizontally assembled projection mode. wherein the set of dividing reflective elements 205 intersect horizontally from top to bottom, and the optical imaging devices 203 and 204 and the set of reflective projectors 206 are all arranged horizontally. In one embodiment, each of the integral images of the multiple misaligned images 304 and 305 that are horizontally arranged in a horizontally arranged type offset optical valve 301, as shown in FIG. 3 (a), from the optical valve 201 , is finally projected on the screen 207 and well combined on the screen 207 in a vertically assembled projection mode, in which the set of dividing reflective elements 205 intersect vertically from left to right, and the imaging devices 203 and 204 and the set of reflective elements 206 projectors are all arranged vertically.

In one embodiment, the image separator and the optical imaging device may be. optically coupled to each other in more diverse configurations, as long as the coupled relationship between the image separator and the optical imaging device is preferably subject to the condition that the respective optical axes for the image separator image and the optical imaging device are coaxial. Figs. 5 (a), 5 (b) and 5 (c) are schematic diagrams illustrating an illustrative configuration between the image separator and the optical imaging device in a top view on an xy plane according to the present invention. . Fig. 5 (a) shows a multi-projection display system 500, and, as shown in Fig. 5 (b), there is a cross point angle α between the upper mirror 505a and the mirror lower 505b in the set of dividing reflective elements 500 at the point of intersection where the upper mirror 505a crosses the lower mirror 505b and a reflecting angle p between an incident beam and a reflected beam for the mirror 506a. The amplitudes for the angles α and β can be freely adjusted so long as the respective optical axes for the image separator 502 and the imaging devices 503a and 503b are preferably coaxial so that the image separator 502 and Imaging devices 503a and 503b may be optically coupled to each other in more diverse configurations, for example, an illustrative configuration as shown in Figures 5 (a) and 5 (b). Certainly, in some embodiments, the optical axes for the image separator and the imaging device may be arranged coaxially as well. Furthermore, although the condition in which there are simply two images formed in a single beam is described in the previous embodiments, in practice the single image separator 502 can separate more than two images carried in a single beam. beam too. In Fig. 5 (c), a single image splitter 502 separates three images k, q, j carried in a single beam emitted from an off-axis optical valve 501 and this single image splitter 502 is optically coupled. to three imaging devices 503a, 503b and 503c. The imaging devices 503a, 503b, and 503c project the three images k, q, j onto a set of surrounded screens 507 to create a full-view theatrical effect. In order to compensate for and adjust the horizontal offset difference resulting from the gap between images on the off-axis optical valve, for example the vertical gap G existing in the vertically arranged off-axis optical valve, as shown on FIG. FIG. 3 (b), for each of the projected images, for horizontally aligning the plurality of projected images with each other on the screen, without at the same time increasing the overall height to the multi-projection core, the optical axes for the image separator and the imaging devices are preferably arranged in a coaxial configuration mode, in which the first optical axis of the image separator 502 and each of the second optical axes of the imaging devices 503a, 503b and 503c are offset relative to each other. Figs. 6 (a) and 6 (b) are schematic diagrams illustrating a coaxial configuration mode for optically coupling the image separator and the side view optical imaging devices on a y-z plane in accordance with the present invention. Since, although an extremely light displacement SD is established between the first optical axis 601 and the second optical axis 602 in the optically coupled position CP of the image separator 603 and the optical imaging device 604, it can cause a sufficiently large displacement LD for the specific projected image displayed on the screen 607 to correspondingly correct the offset deviation from the projected image resulting from the gap between images on the off-axis optical valve 605. Thus , the image separator 603 and the optical imaging device 604 are coaxially arranged to establish an appropriate shift shift SD between the first and second optical axes 601 and 602 to compensate for the horizontal shift for the image or adjust the horizontal position for the projected images displayed on the screen 607, whereby the total height H, namely the thickness, for the multi-project core ection 606 can be correspondingly reduced as well. The multi-projection display system 600 includes the multiprojection core 606 and the screen 607. To further enhance the magnification for the image separator, it is possible to minimize or delete, so that it is as small as possible, the optical angle for the incident beam, emitted from the optical valve, entering the image splitter. Thus, a light integration rod may further be used as a component in the multi-projection display system 200 in the present invention. An architecture of digital light processing technology is used for illustrative purposes in this embodiment. Fig. 7 is a schematic diagram illustrating the multi-projection display system equipped with a light integration rod in accordance with the present invention. In Fig. 7, the multi-projection display system 200 includes a beam source (also referred to as an optical engine) 711, an image splitter 705, an optical imaging device 707 and a screen 709. The source of beam 711 mainly comprises the light source 703, the light integration rod 701 and the optical valve 201.

Although the optical valve 201 is a digital light processing technology, for example a DMD chip, a color wheel 704 is selectively disposed between the light source 703 and the optical valve 201 and further included in the beam source. 711. The light source 703 consists of a lamp 703p and a reflective cover 703r and the light integration rod 701 has a light input end 701n and a light output end 701t. The light source 703, the light integrating rod 701 and the optical valve 201 are configured so that the light emitted from the light source 703 passes through the light integration rod 701 by making it enter from from the light input end 701n and out of the light output end 701t and propagates to the optical valve 201 to form the beam. The integration rod 701 functions to integrate and uniformize the light and is able to cause an elliptical optical angle on the light which correspondingly minimizes the total optical angle for the beam entering the image separator 705, at the same time. time, so that the beam entering the image splitter 705 has a relatively small optical angle. The multi-projection display system in the present invention is particularly adapted to include an image splitter with a positive magnification to be as large as possible and an optical valve capable of providing an elliptical optical angle for an incident beam entering the image separator. In accordance with optical extent theory describing an optical invariant law, it is known that in a specific imaging system, an optical extent amount for an optical cone must be invariant in its propagation path of a point P at a point P 'and obey the optical range invariant law of the following formula (1): 2 - 2 30 E = x A x sin (0) = - x A'xsm (8) wherein (A) is an area or also an enlargement for the point P, A 'is an area or also an enlargement for the point P', 6 is an optical angle at the point P and 0 'is an angle optical point P '. In accordance with the above-mentioned optical range invariant theory, as the magnification A in the image separator can be maximized, the optical angle θ 6 is correspondingly minimized, and vice versa. Accordingly, the present invention provides an image separator which has as large a positive magnification as possible, and an off-axis optical valve in cooperation with a light integration rod 15 which can produce an incident beam entering the separator of the beam. image in an elliptical optical angle as small as possible. Because of the above-mentioned image separator and optical valve 20, the total thickness or width for the multi-projection display system can be substantially reduced. The multi-projection display system in the present invention has a thin or small thickness relative to the same system in the prior art and is consistent with the trend and thinning requirements of consumer electronic devices over the current market. There are additional embodiments provided as follows. . Embodiment 1: Display system for projecting a plurality of images included in a beam on a screen comprises an optical valve providing the beam; an image separator optically coupled to the optical valve and having a first optical axis and a positive magnification; and an optical imaging device optically coupled to the image splitter and having a second optical axis free from being coaxial with the first optical axis, wherein the beam from the optical valve passes through the splitter. image and the optical imaging device to be projected on the screen. Embodiment 2: Display system according to the previous embodiment, wherein the positive magnification is in the range of 1.0 to 3.0. Embodiment 3: Display system according to the previous embodiments, further comprising a light source providing a light and a light integrating rod with a light input surface and a light output surface, wherein the light source is selected from a group consisting of a lamp, an electroluminescent diode, a laser and a combination thereof. Embodiment 4: Display system according to the previous embodiments, wherein the light source, the light integrating rod and the optical valve are configured so that the light emitted from the light source proceeds to through the light integrating rod by entering from the light entry surface and exiting from the light exit surface and propagating toward the optical valve, and the light integrating rod operates to integrating and rendering the light uniform and forcing the light to be in an elliptical optical angle so that the beam entering the image separator has a relatively small optical angle.

Embodiment 5: Display system according to the previous embodiments, wherein the optical valve is selected from a group consisting of a micro-mirror digital display chip, a silicon-on-silicon chip and a chip transmissive liquid crystal display and serves as an image display unit or a light processing unit for processing the plurality of images to be associated with the light in cooperation with the light source and the rod integrating the beam comprising the plurality of images. Embodiment 6: A display system according to the previous embodiments, wherein the image separator further comprises a first lens group located on a first side near the optical valve and a second lens group located on a first one. second side near the optical imaging device. Embodiment 7: A display system according to the foregoing embodiments, wherein the first lens group operates to achieve a first beam convergence and to separate the plurality of images in the beam into a state such that the plurality of lenses images do not overlap in the beam, and the second lens group operates to receive the beam and to achieve a second convergence of the beam. Embodiment 8: Display system according to the previous embodiments, wherein the first lens group is selected from a group consisting of a positive lens, a negative lens and a combination thereof. the second lens group is selected from a group consisting of a positive lens, a negative lens and a combination thereof and configured coaxially on the first optical axis with the first lens group. Embodiment 9: Display system according to the previous embodiments, wherein the beam entering the optical imaging device has a relatively small optical angle when the image separator has the positive magnification. Embodiment 10: Display system according to the previous embodiments, wherein the plurality of images are in one of a first state in which the plurality of images are independent of one another and a second state in which the plurality of images are dependent on each other. Embodiment 11: Display system according to the previous embodiments, wherein there is an offset displacement between the first optical axis 30 and the second optical axis. . Embodiment 12: Display system according to the previous embodiments, wherein there is a set of reflective elements between the image separator and the optical imaging device to divide the beam from the image separator. image into a plurality of divided beams and to direct the plurality of divided beams into respective optical imaging devices. Embodiment 13: Display system for projecting a plurality of images included in a beam on a screen, characterized in that it comprises: an optical valve providing the beam; an image separator optically coupled to the optical valve and having a first optical axis and a positive magnification; and an optical imaging device optically coupled to the image separator and having a second optical axis free from being coaxial with the first optical axis, wherein the beam from the optical valve passes through the image separator and the optical imaging device to be projected on the screen, the display system being a rear projection based display device. Embodiment 14: A projection system for projecting a plurality of images included in a beam on a screen comprises a beam source providing the beam; an image splitter near the beam source and has a positive magnification ratio; and an imaging device in the vicinity of the image splitter, wherein the beam passes through the image splitter and the imaging device to be projected onto the screen. Embodiment 15: projection system according to the previous embodiment, wherein the image separator has a first optical axis and the image device has a second free axis not to be coaxial with the first optical axis. Embodiment 16: A projection system according to the previous embodiments, wherein the beam source further comprises a light source providing light, a light integrating rod having a light input end and a light end. light output and an optical valve, and the light source, the light integrating rod and the optical valve are configured so that light emitted from the light source passes through the light integrating rod upon entering from the light input end and exiting from the light output end and propagates toward the optical valve. Embodiment 17: projection system according to the previous embodiments, wherein the light integrating rod functions to integrate and uniformize the light and to make the light be in an elliptical optical angle, and the optical valve is selected from a group consisting of a micro-mirror digital display chip, a silicon-on-silicon chip, and a liquid crystal transmissive display chip and serves as a light processing unit for processing plurality. images to be associated with the light in cooperation with the light source and the integration rod to form the beam comprising the plurality of images.

Embodiment 18: Projection system according to the previous embodiments, wherein the image separator further comprises a first lens group on a beam source side thereof to the beam source and a second group of lenses on one side imaging device from it to the imaging device. Embodiment 19: projection system according to the previous embodiments, wherein the first lens group operates to realize a first convergence of the beam and to separate the plurality of images in the beam so that the plurality of the images do not overlap in the beam, and the second lens group operates to receive the beam and achieve a second convergence of the beam. Embodiment 20: Projection system for projecting a plurality of images included in a beam from a beam source on a screen comprises an image separator between the beam source and the screen and having a positive magnification . Of course, the invention is not limited to the embodiments described above and shown, from which we can provide other modes and other embodiments, without departing from the scope of the invention. .

Claims (13)

REVENDICATIONS1. A display system for projecting a plurality of images (200, 500, 600) included in a beam on a screen (207, 709), characterized in that it comprises: an optical valve (201) providing the beam; an image separator (202, 502, 603, 705) optically coupled to the optical valve (201) and having a first optical axis (403, 601) and a positive magnification; and an optical imaging device (203, 204, 604, 707) optically coupled to the image separator (202, 502, 603, 705) and having a second optical axis (602) free from being coaxial with the first optical axis (403, 601), wherein the beam from the optical valve (201) passes through the image separator (202, 502, 603, 705) and the optical imaging device (203, 204, 604, 707) to be projected on the screen (207, 709). The display system (200, 500, 600) according to claim 1, characterized in that the positive magnification is in the range of 1.0 to 3.0. The display system (200, 500, 600) according to claim 1 or 2, further characterized in that it comprises a light source (703) providing a light and a light integrating rod (701). with a light input surface and a light output surface, wherein the light source (703) is selected from a group consisting of. 34. lamp (703p), a light-emitting diode, a laser and a combination thereof. 4. Display system (200, 500, 600) according to claim 3, characterized in that the light source (703), the light integration rod (701) and the optical valve (201) are configured so that the light emitted from the light source (703) passes through the light integration rod (701) by entering from the light input surface and exiting from the exit surface of light and propagates toward the optical valve (201) to form the beam, and the light integrating rod (701) functions to integrate and uniformize the light and to cause the light to be in an elliptical optical angle of so that the beam entering the image separator (202, 502, 603, 705) has a relatively small optical angle. 5. Display system (200, 500, 600) according to claim 3 or 4, characterized in that the optical valve (201) is selected from a group consisting of a micro-mirror digital display chip, a silicon-on-silicon chip and a transmissive liquid crystal display chip and serves as an image display unit or a light processing unit for processing the plurality of images to be associated with the light in cooperation with the light source (703) and the integration rod (701) to form the beam comprising the plurality of images. Display system (200, 500, 600) according to any one of claims 1 to 5, characterized in that. 35. that the image separator (202, 502, 603, 705) further comprises a first lens group (401) located on a first side near the optical valve (201) and a second lens group (402) located on a second side near the optical imaging device (203, 204, 604, 707). The display system (200, 500, 600) according to claim 6, characterized in that the first lens group (401) operates to realize a first convergence of the beam (404) and to separate the plurality of the images in the beam in a state such that the plurality of images do not overlap in the beam, and the second lens group (402) operates to receive the beam and achieve a second convergence of the beam. The display system (200, 500, 600) according to claim 6, characterized in that the first lens group (401) is selected from a group consisting of a positive lens, a negative lens and a a combination thereof and the second lens group is selected from a group consisting of a positive lens, a negative lens and a combination thereof and coaxially disposed on the first optical axis (403 , 601) with the first lens group (401). The display system (200, 500, 600) according to any one of claims 1 to 8, characterized in that the beam entering the optical imaging device (203, 204, 604, 707) has correspondingly a relatively small optical angle when the image separator (202, 502, 603, 705) has the positive magnification. Display system (200, 500, 600) according to any one of claims 1 to 9, characterized in that the plurality of images are in one of a first state in which the plurality of images are independent of each other. others and a second state in which the plurality of images are dependent on each other. Display system (200, 500, 600) according to any one of claims 1 to 10, characterized in that there is an offset displacement between the first optical axis (403, 601) and the second optical axis ( 602) so that the image separator (202, 502, 603, 705) and the optical imaging device (203, 204, 604, 707) are coaxially configured. Display system (200, 500, 600) according to any one of claims 1 to 11, characterized in that there is a set of reflective elements (205, 500) between the image separator (202, 502, 603, 705) and the optical imaging device (203, 204, 604, 707) for dividing the beam from the image separator (202, 502, 603, 705) into a plurality of divided beams and for directing the plurality of divided beams into one of a plurality of optical imaging devices (203, 204, 604, 707). The display system (200, 500, 600) according to any one of claims 1 to 12, being a rear projection based display device.