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CN108169910B - Display apparatus and arrangement method thereof - Google Patents

Display apparatus and arrangement method thereof Download PDF

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Publication number
CN108169910B
CN108169910B CN201810003266.XA CN201810003266A CN108169910B CN 108169910 B CN108169910 B CN 108169910B CN 201810003266 A CN201810003266 A CN 201810003266A CN 108169910 B CN108169910 B CN 108169910B
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Prior art keywords
image
light
source
focal plane
splitting
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CN108169910A (en
Inventor
吕向博
李建国
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Lenovo Beijing Ltd
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Lenovo Beijing Ltd
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • G02B27/017Head mounted
    • G02B27/0172Head mounted characterised by optical features
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/283Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)

Abstract

An embodiment of the present disclosure provides a display device, including: the device comprises a light source, a light splitting device, a first image source, a second image source and an image synthesizing device. The light splitting device is positioned in front of the light source and is used for splitting the light emitted from the light source into a first light ray and a second light ray. The first image source is located on an optical path of the first light and used for modulating the first light so as to project a first image to be displayed on the first focal plane. The second image source is located on the optical path of the second light and used for modulating the second light so as to project a second image to be displayed on a second focal plane, wherein the focal length of the first focal plane is shorter than that of the second focal plane. The image synthesis device is positioned in front of the projection of the first image and the second image, and is used for synthesizing the first image and the second image into a synthesized image and displaying the synthesized image to a user. A method for arranging the above display device is also provided.

Description

Display apparatus and arrangement method thereof
Technical Field
The present disclosure relates to the field of imaging, and in particular to a display apparatus and a method of arranging the same.
Background
Portable displays, such as head mounted displays, are now becoming increasingly popular. Including augmented reality glasses and virtual reality helmet in, the optical system that the head mounted display that sees on the market at present adopted is all single focal plane, and optical system is just one at the virtual image that the user was seen before to this virtual image is fixed with user's distance. When a user uses such a head-mounted display, the user may experience dizziness, nausea, and even headache when viewing a scene that is relatively close to the user, which greatly reduces the comfort of using the head-mounted display.
Therefore, there is a need for a display that enables a user to comfortably view a scene at different distances.
Disclosure of Invention
One aspect of the disclosed embodiments provides a display apparatus. The display device comprises a light source, a light splitting device, a first image source, a second image source and an image synthesis device. The light splitting device is positioned in front of the light source and is used for splitting the light emitted from the light source into a first light ray and a second light ray. The first image source is located on an optical path of the first light and used for modulating the first light so as to project a first image to be displayed on a first focal plane. And the second image source is positioned on the optical path of the second light and used for modulating the second light so as to project a second image to be displayed on the second focal plane, wherein the focal length of the first focal plane is shorter than that of the second focal plane. The image synthesis device is positioned in front of the projection of the first image and the second image, and is used for synthesizing the first image and the second image into a synthesized image and displaying the synthesized image to a user.
In some examples, the light splitting device may include a prism including first and second polarization splitting films therein, the first and second polarization splitting films being arranged in the prism at respective angles with respect to the light source such that light of the first and second light paths split by the first and second polarization splitting films forms images to be displayed on the first and second focal planes, respectively, after passing through the first and second image sources.
In some examples, the first image source and the second image source are liquid crystal on silicon image sources.
In some examples, the image synthesis device includes the first and second polarization splitting films in the light splitting device, and the first and second images are reflected by the first and second polarization splitting films to propagate along a same optical path to form the synthesized image.
In some examples, the display device may further include a second prism including a transflective film and a mirror arranged to adjust an optical path of the formed composite image to be suitable for viewing by the user.
Another aspect of the disclosed embodiments provides a method of arranging a display device. The method comprises the following steps: arranging a light source; arranging a light splitting device in front of the light source to split light emitted from the light source into first and second light rays; arranging a first image source on an optical path of the first light, the first image source modulating the first light to project a first image to be displayed on a first focal plane; arranging a second image source on an optical path of the second light, the second image source modulating the second light to project a second image to be displayed on a second focal plane, wherein a focal length of the first focal plane is shorter than a focal length of the second focal plane; and arranging an image synthesis device in front of the projection of the first image and the second image so as to synthesize the first image and the second image into a synthesized image and display the synthesized image to a user.
In some examples, the light splitting device can include a prism including a first polarization splitting film and a second polarization splitting film therein. The method may further comprise: arranging the first and second polarization splitting films in the prism at respective angles with respect to the light source such that light of the first and second light paths split by the first and second polarization splitting films forms images to be displayed on the first and second focal planes, respectively, after passing through the first and second image sources.
In some examples, the first image source and the second image source are liquid crystal on silicon image sources.
In some examples, the image synthesis device includes the first and second polarizing splitting films in the light splitting device, the first and second polarizing splitting films further arranged to reflect the first and second images to propagate along a same optical path to form the synthesized image.
In some examples, the method may further include arranging a second prism comprising a transflective film and a mirror arranged to adjust an optical path of the formed composite image to be suitable for viewing by the user.
Another aspect of the disclosed embodiments provides an apparatus for arranging a display device. The apparatus includes a memory and a processor. The memory is to store executable instructions. The processor is configured to execute the executable instructions stored in the memory to perform the above-described method.
Another aspect of embodiments of the present disclosure provides a memory device having a computer program embodied thereon, which, when executed by a processor, causes the processor to perform the above-described method.
The technical scheme provided by the embodiment of the invention can form two focal planes, one is used for close-range imaging, and the other is used for far-range imaging, so that a user can comfortably observe scenes at different distances.
Drawings
For a more complete understanding of the present invention, and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:
fig. 1 shows a schematic block diagram of a display device according to an embodiment of the present invention.
FIG. 2 illustrates a schematic diagram of one implementation of the display device shown in FIG. 1, in accordance with embodiments of the invention.
Fig. 3 shows a schematic flow diagram of one specific implementation of a method for arranging the display device shown in fig. 1 according to an embodiment of the invention.
Fig. 4 shows a schematic block diagram of one specific implementation of an apparatus for arranging the display device shown in fig. 1 according to an embodiment of the invention.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood that the description is illustrative only and is not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The words "a", "an" and "the" and the like as used herein are also intended to include the meanings of "a plurality" and "the" unless the context clearly dictates otherwise. Furthermore, the terms "comprises," "comprising," and the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It is noted that the terms used herein should be interpreted as having a meaning that is consistent with the context of this specification and should not be interpreted in an idealized or overly formal sense.
Some block diagrams and/or flow diagrams are shown in the figures. It will be understood that some blocks of the block diagrams and/or flowchart illustrations, or combinations thereof, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the instructions, which execute via the processor, create means for implementing the functions/acts specified in the block diagrams and/or flowchart block or blocks.
Fig. 1 shows a schematic block diagram of a display device 100 according to an embodiment of the present invention.
As shown in fig. 1, the display device includes a light source 110, a light splitting device 120, a first image source 130, a second image source 140, and an image synthesizing device 150.
The light splitting means 120 is positioned in front of the light source 110 for splitting the light emitted from the light source 110 into a first light and a second light.
The first image source 130 is located on an optical path of the first light, and is configured to modulate the first light to project a first image to be displayed on the first focal plane.
The second image source 140 is located on the optical path of the second light, and is configured to modulate the second light to project a second image to be displayed on a second focal plane, wherein the focal length of the first focal plane is shorter than the focal length of the second focal plane.
The image synthesizing device 150 is located in front of the projection of the first image and the second image, and is used for synthesizing the first image and the second image into a synthesized image and displaying the synthesized image to a user.
The first focal plane may represent the focal plane when the user is viewing a near scene. In some examples, the focal length of the first focal plane may be 0.25m, although other distances are possible depending on the implementation. Likewise, the second focal plane may represent the focal plane when the user is viewing a scene that is far away. In some examples, the focal length of the second focal plane may be 3m, although other distances are possible depending on the implementation.
In particular, the first and second image sources described above may modulate a near view and a far view onto the first and second light lines, respectively, for display at different focal planes in front of the human eye.
In some examples, light splitting device 120 may include a prism. The prism includes a first polarization splitting film and a second polarization splitting film. The first and second polarization splitting films are arranged in the prism at respective angles with respect to the light source 110 such that the light of the first and second light paths split by the first and second polarization splitting films forms images to be displayed on the first and second focal planes, respectively, after passing through the first and second image sources.
The parameters of the first polarization beam splitting film and the second polarization beam splitting film are adjustable. In some examples, the parameters of the first polarizing splitting film and the second polarizing splitting film may be different.
In some examples, the first image source 130 may be a liquid crystal on silicon image source and the second image source 140 may also be a liquid crystal on silicon image source. The first image source 130 and the second image source 140 may be devices having the same configuration, or may not have the same configuration. In some embodiments, the first image source 130 and the second image source 140 may not be LCOS image sources, but may be any other devices that modulate received light to form an image.
In some examples, the image synthesis device 150 may include a first polarization splitting film and a second polarization splitting film in the light splitting device 120, and the first image and the second image are reflected by the first polarization splitting film and the second polarization splitting film to propagate along the same optical path to form a synthesized image.
In some examples, the display apparatus 100 may further include a second prism 160, and the second prism 160 includes a half-mirror and a half-reflective film. The transflective film and the mirror are arranged to adjust the optical path of the resulting composite image for viewing by a user.
According to the scheme, the images displayed on the two different focal planes are formed by modulating the light of different light paths through the image source, so that the visual irradiation step adjustment conflict is effectively avoided, and the use comfort of a user is improved. It is noted that although in the above example two image sources/two optical paths/two focal planes are used, the approach can also be applied in scenarios where more focal planes are used.
FIG. 2 illustrates a schematic diagram of one implementation of the display device shown in FIG. 1, in accordance with embodiments of the invention. It should be noted that the implementation shown in fig. 2 is only an example provided for illustrating the technical solution of the embodiment of the present invention, and should not be considered as limiting the scope of the present invention.
The light source 110 is provided in the form of a Light Emitting Diode (LED) in fig. 2. Of course, any other available light source, existing or used in the future in the art, is within the scope of embodiments of the present invention and is not limited to LED light sources.
In the implementation shown in fig. 2, a Liquid Crystal On Silicon (LCOS) image source is used as the first image source 130 and the second image source 140 for imaging a real scene. Likewise, any other device known in the art or used in the future that is capable of modulating received light to form an image may also be used. Embodiments of the present invention are not limited by the specific implementation of the first image source 130 and the second image source 140.
In the implementation shown in fig. 2, for example, LCOS1 is used for close-range imaging, while LCOS2 is used for far-range imaging. However, in other implementations, the LCOS1 can also be used for long range imaging, and the LCOS2 for short range imaging, with the only change that needs to be made being to place the LCOS1 and the LCOS2 in the respective optical paths.
In the implementation shown in fig. 2, the prism 1 is used as a specific implementation of the light splitting device 120 shown in fig. 1. Similarly, any other light splitting device that can split the light emitted from the light source into two or more parts, which is currently used in the art or used in the future, may be used as the light splitting device 120 in the embodiment of the present invention.
The prism 1 shown in fig. 2 can be made by means of gluing. The prism 1 can be plated with two polarization light splitting films with different properties, namely a polarization light splitting film 1 and a polarization light splitting film 2. When the light emitted by the light source is contacted with the two polarization light splitting films for the first time, 50% of the light is reflected, and the other 50% of the light is transmitted and is respectively emitted to the LCOS1 and the LCOS 2. The light directed to the LCOS1 is modulated by the LCOS1 to display a near scene, and the light directed to the LCOS2 is modulated by the LCOS2 to display a far scene. These rays are reflected by the LCOS1 and the LCOS2 and change the polarization characteristics. Since the polarization characteristics thereof are changed, the light is totally reflected when coming into contact with the polarization splitting film 1 and the polarization splitting film 2 again.
The above-mentioned number "50%" is merely an example, and a different value may be used depending on the actual situation. For example, in some examples, the polarization splitting film 1 may be adjusted to reflect 60% of the light and transmit 40% of the light, so that the amount of light directed to the LCOS1 is greater than the amount of light directed to the LCOS2, resulting in the displayed near view becoming brighter and the far view becoming darker, thereby making the near view more prominent. Similarly, the polarization splitting film 2 may be similarly adjusted to change the light-dark contrast of the long-range view and the short-range view.
The reflected light rays enter the prism 2 after coming out of the prism 1, a semi-transparent and semi-reflective film and a reflector are arranged in the prism 2, and under the combined action of the semi-transparent and semi-reflective film and the reflector, the light rays change the propagation direction and finally enter human eyes.
In other examples, the prism 2 may not be necessary, and the light reflected from the prism 1 may enter the human eye directly without passing through the prism 2. However, the use of the prism 2 allows the direction in which light rays forming the final image are emitted (i.e., the direction of the human eye) to be set more flexibly.
According to the scheme, the images displayed on the two different focal planes are formed by modulating the light of different light paths through the image source, so that the visual irradiation step adjustment conflict is effectively avoided, and the use comfort of a user is improved. It should be noted that although two image sources/two optical paths/two focal planes are used in the above example, the scheme can also be applied in scenes with more focal planes. In such a scene, there may be one or more intermediate depths of field between the far and near views, and an image source and corresponding optical path corresponding to that depth of field are used.
The first focal plane formed by the light of the LCOS1 may characterize the focal plane when the user is viewing a close scene. In some examples, the focal length of the first focal plane may be 0.25m, although other distances are possible depending on the implementation. Likewise, the second focal plane formed by the light of the LCOS2 may characterize the focal plane when the user is viewing a distant scene. In some examples, the focal length of the second focal plane may be 3m, although other distances are possible depending on the implementation.
Further, the above-described display device (shown in fig. 2) having no moving or vibrating parts (e.g., liquid lens, MEMS, etc.) therein can achieve high reliability in a low-cost manner.
Fig. 3 shows a schematic flow diagram of one specific implementation of a method for arranging the display device shown in fig. 1 according to an embodiment of the invention.
The method shown in fig. 3 includes operation S310: a light source is arranged.
As mentioned above, the arranged light source may be any light source used in the art for enabling imaging.
In operation S320, a light splitting device is disposed in front of the light source to split light emitted from the light source into first and second light rays.
In some examples, the light splitting device may include a prism. The prism may include a first polarization splitting film and a second polarization splitting film therein. In this case, the method shown in fig. 3 may further include: the first and second polarization splitting films are arranged in the prism at respective angles with respect to the light source such that the light of the first and second light paths split by the first and second polarization splitting films forms images to be displayed on the first and second focal planes, respectively, after passing through the first and second image sources.
The first focal plane may represent the focal plane when the user is viewing a near scene. In some examples, the focal length of the first focal plane may be 0.25m, although other distances are possible depending on the implementation. Likewise, the second focal plane may represent the focal plane when the user is viewing a scene that is far away. In some examples, the focal length of the second focal plane may be 3m, although other distances are possible depending on the implementation
In operation S330, a first image source is disposed on an optical path of the first light, the first image source modulating the first light to project a first image to be displayed on a first focal plane.
In operation S340, a second image source is disposed on the optical path of the second light, and the second image source modulates the second light to project a second image to be displayed on a second focal plane.
In this operation, the focal length of the first focal plane is shorter than the focal length of the second focal plane.
In particular, the first and second image sources described above may modulate a near view and a far view onto the first and second light lines, respectively, for display at different focal planes in front of the human eye.
In some examples, the first image source and the second image source may be liquid crystal on silicon image sources. In other examples, the first and second image sources may not be LCOS image sources, but may be any other device that modulates received light to form an image.
In operation S350, an image synthesizing device is disposed in front of the projection of the first and second images to synthesize the first and second images into a synthesized image and display the synthesized image to a user.
In some examples, the image compositing device includes first and second polarizing beam splitting films in the light splitting device, the first and second polarizing beam splitting films further arranged to reflect the first and second images to propagate along a same optical path to form a composite image.
The parameters of the first polarization beam splitting film and the second polarization beam splitting film are adjustable. In some examples, the parameters of the first polarizing splitting film and the second polarizing splitting film may be different.
In some examples, the method may further include disposing a second prism. The second prism may include a transflective film and a mirror. The transflective film and the mirror are arranged to adjust the optical path of the resulting composite image for viewing by a user.
According to the technical scheme provided by the embodiment of the invention, the light of different light paths can be modulated by the image source to form images which are respectively displayed on two different focal planes, one image is used for close-range imaging, and the other image is used for far-range imaging, so that a user can comfortably observe scenes at different distances. It is noted that although in the above example two image sources/two optical paths/two focal planes are used, the approach can also be applied in scenarios where more focal planes are used.
Fig. 4 shows a schematic block diagram of one specific implementation of an apparatus for arranging the display device shown in fig. 1 according to an embodiment of the invention.
The device shown in fig. 4 is only an example and should not bring any limitation to the function and use range of the embodiments of the present disclosure.
As shown in fig. 4, the apparatus 400 according to this embodiment includes a Central Processing Unit (CPU)401 that can perform various appropriate actions and processes in accordance with a program stored in a Read Only Memory (ROM)402 or a program loaded from a storage section 408 into a Random Access Memory (RAM) 403. In the RAM 403, various programs and data necessary for the operation of the device 400 are also stored. The CPU 401, ROM 402, and RAM 403 are connected to each other via a bus 404. An input/output (I/O) interface 405 is also connected to bus 404.
The device 400 may also include one or more of the following components connected to the I/O interface 405: an input portion 406 including a keyboard or a mouse, etc.; an output section 407 including a display such as a Cathode Ray Tube (CRT) or a Liquid Crystal Display (LCD), and a speaker; a storage section 408 including a hard disk and the like; and a communication section 409 including a network interface card such as a LAN card or a modem. The communication section 409 performs communication processing via a network such as the internet. A driver 410 is also connected to the I/O interface 405 as needed. A removable medium 411 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory, etc., is mounted on the drive 410 as necessary, so that a computer program read out therefrom is mounted into the storage section 408 as necessary.
In particular, according to an embodiment of the present disclosure, the processes described above with reference to the flowcharts may be implemented as computer software programs. For example, embodiments of the present disclosure include a computer program product comprising a computer program embodied on a computer readable medium, the computer program comprising program code for performing the method illustrated in the flow chart. In such an embodiment, the computer program may be downloaded and installed from a network through the communication section 409, and/or installed from the removable medium 411. The above-described functions defined in the apparatus of the embodiment of the present disclosure are performed when the computer program is executed by a Central Processing Unit (CPU) 401.
It should be noted that the computer readable media shown in the present disclosure may be computer readable signal media or computer readable storage media or any combination of the two. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present disclosure, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In contrast, in the present disclosure, a computer-readable signal medium may include a propagated data signal with computer-readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, fiber optic cable, or RF, etc., or any suitable combination of the foregoing.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams or flowchart illustration, and combinations of blocks in the block diagrams or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Methods, apparatus, units and/or modules according to embodiments of the present disclosure may also be implemented using hardware or firmware, or in any suitable combination of software, hardware and firmware implementations, for example, Field Programmable Gate Arrays (FPGAs), Programmable Logic Arrays (PLAs), system on a chip, system on a substrate, system on a package, Application Specific Integrated Circuits (ASICs), or in any other reasonable manner for integrating or packaging circuits. The system may include a storage device to implement the storage described above. When implemented in these manners, the software, hardware, and/or firmware used is programmed or designed to perform the corresponding above-described methods, steps, and/or functions according to the present disclosure. One skilled in the art can implement one or more of these systems and modules, or one or more portions thereof, using different implementations as appropriate to the actual needs. All of these implementations fall within the scope of the present invention.
As will be understood by those skilled in the art, for any and all purposes, such as in terms of providing a written description, all ranges disclosed herein also encompass any and all possible subranges and combinations of subranges thereof. Any listed range can be easily identified as a sufficient description and enabling the same range to be at least broken down into equal halves, thirds, quarters, fifths, tenths, etc. As a non-limiting example, each range discussed in this application can be readily broken down into a lower third, a middle third, and an upper third, among others. As those skilled in the art will also appreciate, all language such as "up to," "at least," "greater than," "less than," or the like, includes the recited quantity and refers to a range that can be subsequently broken down into subranges as discussed above. Finally, as will be understood by those skilled in the art, a range includes each individual component. So, for example, a group having 1-3 cells refers to a group having 1, 2, or 3 cells. Similarly, a group having 1-5 cells refers to groups having 1, 2, 3, 4, or 5 cells, and so forth.
While the present invention has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. Accordingly, the scope of the present invention should not be limited to the above-described embodiments, but should be defined not only by the appended claims, but also by equivalents thereof.

Claims (8)

1. A display device, comprising:
a light source;
a light splitting device positioned in front of the light source and used for splitting the light emitted from the light source into a first light ray and a second light ray;
the first image source is positioned on the light path of the first light and used for modulating the first light so as to project a first image to be displayed on a first focal plane;
a second image source, located on an optical path of the second light, for modulating the second light to project a second image to be displayed on a second focal plane, wherein a focal length of the first focal plane is shorter than a focal length of the second focal plane; and
an image synthesizing device positioned in front of the projection of the first image and the second image and used for synthesizing the first image and the second image into a synthesized image and displaying the synthesized image to a user,
the image synthesizing device comprises a first polarization light splitting film and a second polarization light splitting film, and the first image and the second image are reflected by the first polarization light splitting film and the second polarization light splitting film to be transmitted along the same light path so as to form the synthesized image.
2. A display apparatus according to claim 1, wherein the first and second polarization splitting films are arranged in a prism at respective angles relative to the light source such that light of the first and second light paths split by the first and second polarization splitting films forms an image to be displayed on the first and second focal planes, respectively, after passing through the first and second image sources.
3. The display device of claim 1 or 2, wherein the first image source and the second image source are liquid crystal on silicon image sources.
4. The display device of claim 1, further comprising a second prism comprising a transflective film and a mirror arranged to adjust an optical path of the formed composite image to be suitable for viewing by the user.
5. A method of arranging a display device, comprising:
arranging a light source;
arranging a light splitting device in front of the light source to split light emitted from the light source into first and second light rays;
arranging a first image source on an optical path of the first light, the first image source modulating the first light to project a first image to be displayed on a first focal plane;
arranging a second image source on an optical path of the second light, the second image source modulating the second light to project a second image to be displayed on a second focal plane, wherein a focal length of the first focal plane is shorter than a focal length of the second focal plane; and
arranging an image synthesis device in front of the projection of the first image and the second image to synthesize the first image and the second image into a synthesized image and display the synthesized image to a user,
wherein the image compositing device comprises first and second polarizing beam splitting films further arranged to reflect the first and second images to propagate along a same optical path to form the composite image.
6. The method of claim 5, wherein the method further comprises:
disposing the first and second polarization splitting films in a prism at respective angles with respect to the light source such that light of the first and second light paths split by the first and second polarization splitting films forms images to be displayed on the first and second focal planes, respectively, after passing through the first and second image sources.
7. The method of claim 5 or 6, wherein the first image source and the second image source are liquid crystal on silicon image sources.
8. The method of claim 5, further comprising arranging a second prism comprising a transflective film and a mirror arranged to adjust an optical path of the formed composite image to be suitable for viewing by the user.
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