CN111458881A - Display system and head-mounted display equipment - Google Patents
Display system and head-mounted display equipment Download PDFInfo
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- CN111458881A CN111458881A CN202010402569.6A CN202010402569A CN111458881A CN 111458881 A CN111458881 A CN 111458881A CN 202010402569 A CN202010402569 A CN 202010402569A CN 111458881 A CN111458881 A CN 111458881A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B2027/0178—Eyeglass type
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Abstract
The invention discloses a display system, which comprises a waveguide and at least three image projection devices, wherein the at least three image projection devices are used for projecting at least three different primary color lights respectively, and the primary color light output by each image projection device carries image information; the waveguide comprises a second area and at least three first areas, the at least three first areas correspond to the at least three image projection devices one by one respectively, the first areas are used for coupling the primary color light output by the image projection devices corresponding to the first areas into the waveguide, and the second areas are used for coupling various primary color lights propagated through the waveguide out of the waveguide, so that the coupled various primary color lights are converged. The invention also discloses a head-mounted display device comprising the display system. The display system and the projection device in the head-mounted display equipment can adopt equipment with a miniaturized structure, and the light combining element is not required to be additionally adopted to combine the output light of each projection device, so that the volume of the equipment can be reduced, and the power consumption of the equipment can be reduced.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display system and a head-mounted display device.
Background
Augmented Reality (AR) technology is an optical technology, can add light and virtual image of a real scene into human eyes after superposition, achieves an Augmented Reality display effect, can integrate functions such as environmental perception and interaction at present, can bring immersive experience and experience for users, and enables the AR technology to be concerned and applied more and more widely.
The optical waveguide technology is a mainstream implementation mode for augmented reality display, has the characteristics of large eye box area, light weight, thinness and the like, can be used for manufacturing an augmented reality display optical system into a product which is close to the appearance of common glasses, and is popular among people.
In the prior art, in an AR optical system based on an optical waveguide technology, an imaging device uses a device based on a reflective display principle, such as a Digital light Processing (D L light Processing, D L P) projection optical machine or a Silicon-based liquid Crystal on Silicon (L COS) projection optical machine, the structure of the device comprises a light source, a display screen and an imaging lens, the device is large in size and difficult to meet the requirement of miniaturization of an AR product.
Disclosure of Invention
The invention aims to provide a display system and a head-mounted display device, which can reduce the volume of the head-mounted display device and reduce the power consumption of the head-mounted display device.
In order to achieve the purpose, the invention provides the following technical scheme:
a display system comprises a waveguide and at least three image projection devices, wherein the at least three image projection devices are used for projecting at least three different primary color lights respectively, and the primary color light output by each image projection device carries image information;
the waveguide comprises a second area and at least three first areas, the at least three first areas correspond to the at least three image projection devices one by one respectively, the first areas are used for coupling the primary color light output by the image projection devices corresponding to the first areas into the waveguide, and the second areas are used for coupling various primary color lights propagated through the waveguide out of the waveguide, so that the coupled various primary color lights are combined.
Preferably, at least three of the image projection devices are arranged on the same side of the waveguide, or at least three of the image projection devices are respectively arranged on two sides of the waveguide.
Preferably, the operating spectral band of the first region matches the spectral band of the primary color light output by the image projection device corresponding to the operating spectral band of the first region.
Preferably, the primary color light images projected by the respective image projection devices are uniform in size.
Preferably, the image processing device further comprises a processing device connected to each of the image projection devices, and configured to shift the pixels of the images output by each of the image projection devices so that the corresponding pixels of the images of the primary colors in the images output by the second area coincide with each other.
Preferably, the processing device is specifically configured to perform pixel shift on images output by other of the projection devices with reference to the primary color light image output by any one of the projection devices, so that pixels of the primary color light image output by the other projection devices in the image output by the second region coincide with corresponding pixels in the reference image.
Preferably, the image projection device comprises a multi-zone light distribution independent control light emitting diode image projection device.
Preferably, the projector comprises three image projection devices, and each image projection device is used for projecting three different primary color lights respectively.
A head mounted display device comprising a display system as described above.
The present invention provides a display system, including a waveguide and at least three image projecting devices, where the waveguide includes a second region and at least three first regions, the at least three first regions correspond to the at least three image projecting devices one by one, the image projecting devices are configured to project primary color lights carrying image information, each image projecting device projects at least three different primary color lights, the first regions are configured to couple the primary color lights output by the image projecting devices corresponding to the first regions into the waveguide, and the second regions are configured to couple various primary color lights propagated through the waveguide out of the waveguide, so that the coupled primary color lights are merged, and a user can view a virtual image. Compared with the prior art, the projection device in the display system can adopt equipment with a miniaturized structure, and the light combining element is not required to be additionally adopted to combine the output light of each projection device, so that the volume of the equipment can be reduced, and the power consumption of the equipment can be reduced.
According to the head-mounted display equipment, the display system is adopted, so that the size of the head-mounted display equipment can be reduced, and the power consumption of the head-mounted display equipment is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a display system according to an embodiment of the present invention;
FIG. 2 is a diagram of a display system according to another embodiment of the present invention;
FIG. 3 is a diagram of a first primary color image output by the display system according to an embodiment of the present invention;
FIG. 4 is an image output before calibration of the display system in an embodiment of the present invention;
fig. 5 is an image calibrated for the image shown in fig. 4.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Embodiments of the present invention provide a display system, which can be applied to a head-mounted display device, particularly an AR device, and can also be applied to other display devices. The display system comprises a waveguide and at least three image projection devices, wherein the at least three image projection devices are used for projecting at least three different primary color lights respectively, and the primary color light output by each image projection device carries image information;
the waveguide comprises a second area and at least three first areas, the at least three first areas correspond to the at least three image projection devices one by one respectively, the first areas are used for coupling the primary color light output by the image projection devices corresponding to the first areas into the waveguide, and the second areas are used for coupling various primary color lights propagated through the waveguide out of the waveguide, so that the coupled various primary color lights are combined.
The image projection device is used for projecting primary color light, wherein the primary color light carries image information, at least three image projection devices project at least three different primary color lights, and if the primary color lights are converged into eyes of a user, the user can view an image with the color close to an actual scene. The light projected by the image projection device is coupled into the waveguide through the corresponding first region on the waveguide, various primary color lights are transmitted in the waveguide, the light is coupled out of the waveguide through the second region of the waveguide when reaching the second region, and the coupled various primary color lights are converged and enter eyes of a user, so that the user can watch a virtual image. Compared with the prior art, the projection device in the display system of the embodiment can adopt equipment with a miniaturized structure, and the light combining element is not required to be additionally adopted to combine the output light of each projection device, so that the volume of the equipment can be reduced, and the power consumption of the equipment can be reduced.
The display system is described in detail below with reference to the following detailed description and accompanying drawings. The display system of this embodiment comprises a waveguide for propagating light rays, the light rays entering the waveguide propagating along the waveguide by total reflection, and at least three image projection means.
At least three image projection devices respectively project at least three different primary color lights, the primary color light output by each image projection device carries image information, the primary color lights output by the image projection devices are converged, and when user eyes acquire converged light, images with colors close to actual scenes can be observed.
The waveguide comprises a second area and at least three first areas, the at least three first areas correspond to the at least three image projection devices one by one respectively, and the first areas are used for coupling the primary color light output by the image projection devices corresponding to the first areas into the waveguide. In a specific implementation, a grating structure may be formed in the first region of the waveguide or a diffraction element may be disposed in the first region of the waveguide, and light incident on the first region may be diffracted to be coupled into the waveguide. The present embodiment does not specifically limit the grating structure and the diffraction element that the first region may have. Preferably, the working spectral band of the first region is matched with the spectral band of the primary color light output by the corresponding image projection device, and the working spectral band of the first region is a narrow spectrum, so that only the primary color light output by the corresponding image projection device can be coupled into the waveguide, and the coupling efficiency is high.
Referring to fig. 1, fig. 1 is a schematic diagram of a display system according to an embodiment, and it can be seen that the display system includes a waveguide 10, a first image projection device 11, a second image projection device 12, and a third image projection device 13, where the first image projection device 11, the second image projection device 12, and the third image projection device 13 respectively project three different primary color lights. The waveguide 10 comprises a first region 100, a first region 101, a first region 102 and a second region 103, wherein the first, second and third image projection means 11, 12, 13 correspond to the first region 100, the first region 101, 102 of the waveguide 10, respectively. The primary color light projected by the first image projection device 11 is coupled into the waveguide 10 through the first region 100 of the waveguide 10, the primary color light projected by the second image projection device 12 is coupled into the waveguide 10 through the first region 101 of the waveguide 10, and the primary color light projected by the third image projection device 13 is coupled into the waveguide 10 through the first region 102 of the waveguide 10.
Alternatively, the display system may comprise at least three image projection devices arranged on the same side of the waveguide, for example as shown in fig. 1, the first region 101, the first region 102 and the second region 103 being arranged on the same side of the waveguide 10, and the corresponding first image projection device 11, the second image projection device 12 and the third image projection device 13 being arranged on the same side of the waveguide 10.
Optionally, at least three image projection devices included in the display system may be respectively arranged on both sides of the waveguide. Referring to fig. 2 for an exemplary illustration, fig. 2 is a schematic diagram of a display system according to yet another embodiment, and it can be seen that the display system includes a waveguide 20, a first image projecting device 21, a second image projecting device 22, and a third image projecting device 23, the waveguide 20 includes a first region 200, a first region 201, a first region 202, and a second region 203, wherein the first image projecting device 21, the second image projecting device 22, and the third image projecting device 23 project three different primary color lights, and the first image projecting device 21, the second image projecting device 22, and the third image projecting device 23 correspond to the first region 200, the first region 201, and the first region 202 of the waveguide 20, respectively. The first region 200, the first region 201 and the first region 202 are located on both sides of the waveguide 20, and the corresponding first, second and third image projection devices 21, 22 and 23 are respectively disposed on both sides of the waveguide 20.
The display system shown in fig. 1 and fig. 2 is only used as an example to illustrate the arrangement of each projection device and waveguide of the display system, and in practical application, the display system is not limited to the above embodiment, and the arrangement of each projection device and waveguide may be determined according to application requirements or product requirements, and may be designed flexibly. In addition, the display system shown in fig. 1 and 2 is exemplified to include three image projection devices that respectively emit three primary colors, and in other embodiments, the display system may include other numbers of image projection devices for projecting the primary colors, and all fall within the protection scope of the present invention.
Furthermore, the primary color light images projected by the respective image projection devices in the display system have the same size, including the length and the width of the images, so that the light rays projected by the respective image projection devices are coupled into the waveguide, and the light rays of the respective portions are coupled out through the second region of the waveguide, thereby aligning the corresponding pixels of the respective primary color light images.
The second region is used for coupling the various primary color lights propagated through the waveguide out of the waveguide, so that the coupled-out various primary color lights are merged. Referring to fig. 1, the first image projecting device 11, the second image projecting device 12, and the third image projecting device 13 respectively project three different primary color lights, the primary color lights coupled into the waveguide 10 respectively propagate along the waveguide 10, the primary color lights are coupled out of the waveguide 10 through the second region 103 when reaching the second region 103, and the coupled primary color lights are converged into the user's eyes 15, so that the user views a virtual image. In specific implementation, a grating structure may be fabricated in the second region of the waveguide or a diffraction element may be disposed in the second region of the waveguide, and the light reaching the second region is diffracted to couple out the light from the waveguide. The present embodiment does not specifically limit the grating structure and the diffraction element that the second region may have.
In practical application, because the pixel point of the display picture of the display system with a miniaturized structure is very small, usually only tens of microns to a few microns, if the alignment of the image pixel level is realized by only optical design and production assembly, the requirement on the production precision is too high, and the producibility is not high. In this regard, the display system of this embodiment further includes a processing device, which is connected to each of the projection devices, respectively, and is configured to perform pixel shift on the images output by each of the projection devices, so that corresponding pixels of the images of the primary colors in the images output by the second area coincide with each other.
Optionally, in a specific implementation, the processing device is specifically configured to perform pixel shift on images output by other projection devices with reference to the primary color light image output by any one of the projection devices, so that pixels of the primary color light images output by other projection devices in the image output by the second region coincide with corresponding pixels in the reference image.
Referring to fig. 3, fig. 3 is a diagram of a first primary color image output by the display system in an embodiment, which includes two kinds of pixels with gray scale values, i.e., a pixel 300 with gray scale value a1, a pixel 301 with gray scale value a2 represents a pixel of the first primary color image, a middle region, i.e., a region where the pixels 301 are distributed, is a normal display region, and the surrounding pixels 300 are used to adjust and shift the pixels.
Referring to fig. 4 and 5, fig. 4 is an image outputted before the display system is calibrated in an embodiment, and fig. 5 is an image obtained after the image shown in fig. 4 is calibrated, wherein the image includes three gray-level pixels, a gray-level pixel 300 of a1, a gray-level pixel 301 of a2 represents a pixel of the first primary color image, and a gray-level pixel 302 of A3 represents a pixel of the second primary color image. It can be seen that, in fig. 4, the pixel point 301 of the first primary color light image and the pixel point 302 of the second primary color light image are not completely aligned, and there is a position deviation, and by performing pixel offset on the pixels of the two images, specifically, the pixel point 302 of the second primary color light image can be used as a reference, the pixel point 301 of the first primary color light image is offset rightward and upward by 1 pixel point, and the image after pixel offset is performed on fig. 4 is as shown in fig. 5, and the pixel point 301 of the first primary color light image and the pixel point 302 of the second primary color light image are overlapped in fig. 5 (for convenience of observation, the pixel point 301 and the pixel point 302 are not completely overlapped in fig. 5).
Preferably, the projection device in the display system of this embodiment may adopt a multi-partition light distribution independent control light emitting diode projection device, that is, a U L ED projection device, and the U L ED projection device adopts a self-luminous display technology, and due to its self-luminous display principle, only bright pixel points consume power, and other non-bright pixel points do not consume power at all, and the power consumption of the pixel points with low brightness may also be reduced, which may greatly save power consumption, and is beneficial to improve the endurance time of the AR glasses using battery power supply.
Correspondingly, the embodiment of the invention also provides a head-mounted display device which comprises the display system.
The head-mounted display device of the embodiment adopts a display system comprising a waveguide and at least three image projection devices, wherein the waveguide comprises a second region and at least three first regions, the at least three first regions are respectively in one-to-one correspondence with the at least three image projection devices, the image projection devices are used for projecting primary color light carrying image information, each image projection device projects at least three different primary color light respectively, the first regions are used for coupling the primary color light output by the image projection devices corresponding to the first regions into the waveguide, and the second regions are used for coupling various primary color light propagated through the waveguide out of the waveguide, so that the coupled primary color light is converged and a user can watch a virtual image. Compared with the prior art, the projection device in the head-mounted display equipment can adopt equipment with a miniaturized structure, and the output light of each projection device is converged without adopting a light converging element additionally, so that the size of the equipment can be reduced, and the power consumption of the equipment is reduced.
The display system and the head-mounted display device provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. A display system is characterized by comprising a waveguide and at least three image projection devices, wherein the at least three image projection devices are used for projecting at least three different primary color lights respectively, and the primary color light output by each image projection device carries image information;
the waveguide comprises a second area and at least three first areas, the at least three first areas correspond to the at least three image projection devices one by one respectively, the first areas are used for coupling the primary color light output by the image projection devices corresponding to the first areas into the waveguide, and the second areas are used for coupling various primary color lights propagated through the waveguide out of the waveguide, so that the coupled various primary color lights are combined.
2. The display system according to claim 1, wherein at least three of the image projection devices are arranged on the same side of the waveguide, or at least three of the image projection devices are arranged on both sides of the waveguide, respectively.
3. The display system of claim 1 wherein the first region has an operating spectral band that matches a spectral band of primary color light output by the image projection device to which it corresponds.
4. The display system of claim 1 wherein the primary color light images projected by the respective image projection devices are of uniform size.
5. A display system according to any one of claims 1 to 4, further comprising processing means, respectively associated with each of the image projecting means, for pixel shifting the image output by each of the image projecting means such that corresponding pixels of the images of the primary colours in the image output by the second region coincide.
6. The display system according to claim 5, wherein the processing means is specifically configured to perform pixel shifting on the images output by the other projection devices with reference to the primary color image output by any one of the projection devices, so that the pixels of the primary color images output by the other projection devices in the image output by the second region coincide with the corresponding pixels in the reference image.
7. The display system of claim 1, wherein the image projection device comprises a multi-zone light distribution independently controlled light emitting diode image projection device.
8. A display system according to claim 1, comprising three said image projection devices, each for projecting a different one of three primary colors.
9. A head-mounted display device comprising a display system according to any one of claims 1-8.
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| CN202010402569.6A CN111458881A (en) | 2020-05-13 | 2020-05-13 | Display system and head-mounted display equipment |
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| CN202010402569.6A CN111458881A (en) | 2020-05-13 | 2020-05-13 | Display system and head-mounted display equipment |
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Application publication date: 20200728 |