CN111885364B - Micro-projection device and electronic device - Google Patents
Micro-projection device and electronic device Download PDFInfo
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- CN111885364B CN111885364B CN202010587806.0A CN202010587806A CN111885364B CN 111885364 B CN111885364 B CN 111885364B CN 202010587806 A CN202010587806 A CN 202010587806A CN 111885364 B CN111885364 B CN 111885364B
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- 230000003287 optical effect Effects 0.000 claims description 19
- 238000010168 coupling process Methods 0.000 claims description 11
- 238000005859 coupling reaction Methods 0.000 claims description 11
- 230000008878 coupling Effects 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000005530 etching Methods 0.000 claims description 2
- 238000001259 photo etching Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
- 239000011521 glass Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003190 augmentative effect Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/317—Convergence or focusing systems
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Mechanical Optical Scanning Systems (AREA)
- Projection Apparatus (AREA)
Abstract
Embodiments of the present disclosure provide a micro-projection device and an electronic device. The micro-projection device includes: a microelectromechanical system scanner; the micro light emitting diode is arranged on the rotating surface of the micro electro mechanical system scanner; and a micro-optic device disposed on the micro light emitting diode.
Description
Technical Field
The present disclosure relates to the field of projection technologies, and in particular, to a micro-projection device and an electronic device.
Background
Projection devices are increasingly receiving attention from technicians. A projection device may be used to project an image or video onto a screen for viewing by a user.
Fig. 1 shows the basic structure of the present projection apparatus. In the projection apparatus shown in fig. 1, a light source 11 emits image light. The light source 11 is, for example, a red, yellow, blue laser diode.
The image light is irradiated to the reflecting surface 13 through the optical device 12. The optical device 12 can correct optical characteristics such as dispersion and distortion of the image light emitted from the light source 11. The reflecting surface 13 may be, for example, a MEMS scanning micromirror. The MEMS scanning micromirror 13 can deflect along one axis to project image light to the projection surface 15 via another optics 14. Here, the optical device 14 may be omitted.
Since the laser diode has a large size, it is difficult to reduce the size of the projection apparatus. Further, in such a projection apparatus, a large optical module is required. This also results in a larger size of the projection device.
Therefore, there is a need to devise a new solution for projection devices.
Disclosure of Invention
Embodiments of the present specification provide new solutions for projection devices.
According to a first aspect of the present specification, there is provided a micro-projection device comprising: a microelectromechanical system scanner; the micro light emitting diode is arranged on the rotating surface of the micro electro mechanical system scanner; and a micro-optic device disposed on the micro light emitting diode.
According to a second aspect of the present description there is provided an electronic device comprising a micro-projection device as described herein.
In various embodiments, a novel micro-projection device is provided by combining micro-leds with a mems scanner.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the embodiments of the disclosure.
Further, not all of the effects described above need be achieved in any of the embodiments of the present specification.
Other features of embodiments of the present specification and its advantages will become apparent from the following detailed description of exemplary embodiments of the present specification, which refers to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present description or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the embodiments of the present description, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
Fig. 1 shows a schematic configuration of a conventional scanning apparatus.
Fig. 2 shows a schematic top view of a projection device according to an embodiment in operation.
Fig. 3 shows a schematic front view of a projection device according to another embodiment.
Fig. 4 shows a schematic top view of a projection device according to a further embodiment.
Fig. 5 shows a schematic diagram of a projection device pixel arrangement according to a further embodiment.
Fig. 6 shows a schematic diagram of a projection device pixel arrangement according to a further embodiment.
Fig. 7 shows a schematic diagram of an electronic device according to a further embodiment.
Detailed Description
Various exemplary embodiments will now be described in detail with reference to the accompanying drawings.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Different embodiments and examples of the present specification are described below with reference to the accompanying drawings.
Fig. 2 shows a schematic top view of a projection device according to an embodiment in operation.
As shown in fig. 2, the micro-projection apparatus includes: a microelectromechanical system scanner 21, a micro light emitting diode 22 disposed on a rotational surface 26 of the microelectromechanical system (MEMS) scanner 21, and a micro optical device 23 disposed on the micro light emitting diode.
In fig. 2, light emitted by the micro-leds 22 is concentrated via micro-optics 23 to a focal point 24, which focal point 24 is located in the plane to be projected. The micro-optics 23 may be micro-lenses and may be formed by means of photolithography, etching, coating, etc. MEMS scanner 21 may rotate along axis 25. As the MEMS scanner 21 rotates, the micro light emitting diode 22 located on the rotation surface 26 also rotates, thereby scanning out an image line of an image to be projected.
Fig. 2 (a) shows a case where the rotation surface 26 is located at the intermediate position (0 °) when the projection apparatus is in operation. Fig. 2 (B) shows a case where the rotation surface 26 is rotated rightward by an angle θ° when the projection apparatus is in operation. Fig. 2 (C) shows a case where the rotation surface 26 is rotated to the left by an angle- θ° when the projection apparatus is in operation. As shown in fig. 2 (a), (B), and (C), when the rotation surface 26 rotates, the light emitted from the micro-light emitting secondary stage 22 forms an image line in the horizontal direction.
Here, the MEMS scanner, the micro light emitting diode, and the micro optical device are combined, so that the size of the entire optical system can be reduced, and a miniaturized scanning system can be realized.
Fig. 3 shows a schematic front view of a projection device according to another embodiment.
As shown in fig. 3, the MEMS scanner 31 may include two rotation axes 311 and 312. One or more micro-leds 32 are provided on the rotating surface 313 of the MEMS scanner 31, and micro-optics (micro-optics are not shown here for clarity) are provided on each micro-led 32. The rotation surface 313 of the mems scanner 31 can form an image line in the horizontal direction by the rotation shaft 311. The rotation surface 313 of the mems scanner 31 can form an image line in the vertical direction by the rotation shaft 312.
In fig. 3, only one micro light emitting diode may be provided on the rotation surface 313, or a plurality of micro light emitting diodes may be provided. The plurality of micro light emitting diodes may be arranged to have a common focal point so that the formed image has a higher brightness. Further, the plurality of micro light emitting diodes may be arranged to form a plurality of pixels at the same time, so that the rate of image scanning may be increased, thereby increasing the frame rate of the image.
Fig. 4 shows a schematic top view of a projection device according to a further embodiment.
As shown in fig. 4, the MEMS scanner 41 can be rotated horizontally (first direction) along an axis 45. The scanning surface of the MEMS scanner 41 includes two inclined planes 46a, 46b to form a V-shaped surface. Micro light emitting diodes 42a, 42b are provided on the inclined planes 46a, 46b, respectively. Micro-optics 43a, 43b are formed on the micro light emitting diodes 42a, 42b. The V-shaped surface allows the micro light emitting diodes located in the same row to be confocal in the image plane. In the horizontal plane as shown in fig. 4, the light emitted by the micro light emitting diodes 42a, 42b is concentrated to a common focal point 44 due to the inclined planes 46a, 46 b. Here, the micro light emitting diodes 42a, 42b in different pixel rows may form two columns of light sources (micro light emitting diodes) and form one column of pixels.
Fig. 4 shows only the case where two micro light emitting diodes 42a, 42b have a common focus. According to the technical scheme disclosed herein, more than two micro light emitting diodes in the same image row can be converged to the same focus.
By focusing the light emitted by the plurality of micro light emitting diodes to a common focal point, the brightness of the image pixel can be increased.
In addition, the light of the micro light emitting diodes with different colors can be converged to one focus in this way, so as to generate the pixels of the color image.
In addition, since one pixel is formed by a plurality of micro light emitting diodes, the pixel can still be displayed when one micro light emitting diode fails. In this case, a redundant backup of display pixels may be performed. Therefore, this may increase the reliability of the display device.
It will be appreciated by those skilled in the art in light of the teachings herein that in addition to focusing light from a plurality of micro light emitting diodes to a common focal point by the angled surfaces 46a, 46b, light from a plurality of micro light emitting diodes may be focused to a common focal point by micro optics.
Fig. 5 shows a schematic diagram of a projection device pixel arrangement according to a further embodiment.
As shown in fig. 5, the scanning surface of the MEMS scanner 51 rotates (scans) in a first direction (X direction) of an image to be projected. The micro light emitting diodes are arranged in a micro light emitting diode column on the rotation plane in a second direction (Y direction) of the image to be projected. The micro light emitting diodes in the Y direction form pixel columns in the Y direction. In fig. 5, the micro light emitting diode 52r is a red micro light emitting diode, the micro light emitting diode 52g is a green micro light emitting diode, and the micro light emitting diode 52b is a blue micro light emitting diode. The light emitted by a set of micro-leds 52r, 52g, 52b is focused to a common focal point to form an image pixel 52.
Fig. 6 shows a schematic diagram of a projection device pixel arrangement according to a further embodiment.
Fig. 6 illustrates a number of different ways in which micro light emitting diodes may be arranged to form image pixels. In fig. 6, the rotation surface of the MEMS scanner 61 rotates in a first direction (X direction) of an image to be projected. The micro light emitting diodes are arranged in a micro light emitting diode row on the rotation surface in a second direction (Y direction) of an image to be projected. Fig. 6 shows three columns of micro light emitting diodes.
The micro light emitting diodes may form a plurality of columns of micro light emitting diodes to form a plurality of pixel columns of an image. In this way, a plurality of columns of image pixels can be formed at one point in time when the MEMS scanner 61 performs scanning. With this arrangement, image resolution and/or image brightness can be improved at the same scanning frequency.
As indicated by reference numeral 621 in fig. 6, a plurality of micro light emitting diodes located in the same row among a plurality of columns of micro light emitting diodes are confocal in an image plane to form one pixel of the image. For example, the three micro light emitting diodes in the pixel 621 are red, yellow, and blue micro light emitting diodes, respectively, and red, yellow, and blue micro light emitting diode columns are formed, respectively. The micro light emitting diodes in the same row in the red, yellow and blue micro light emitting diode columns are confocal in the image plane to form one pixel of the image. In addition, the micro light emitting diodes in the pixel 621 may be the same color micro light emitting diodes to enhance the pixel brightness of the image.
As indicated by reference numeral 622 in fig. 6, a plurality of micro light emitting diodes in a column of micro light emitting diodes in a micro light emitting diode column are confocal at an image plane to form one pixel of an image.
As indicated by reference numeral 623 in fig. 6, a plurality of micro light emitting diodes located in a plurality of columns and a plurality of rows among a plurality of columns of micro light emitting diodes are confocal at an image plane to form one pixel of the image. In this way, the brightness and/or resolution of the image pixels, etc., may be enhanced.
Fig. 7 shows a schematic diagram of an electronic device according to a further embodiment.
The electronic device shown in fig. 7 includes a controller 71 and the micro-projection device described above. The controller 71 may control the micro-projection device to project an image to the human eye 74.
As an example, an augmented reality glasses/virtual reality glasses using a micro-projection device is shown in fig. 7. In the electronic device shown in fig. 7, the micro-projection device includes the mems scanner 721, the micro-leds 722, and the micro-optics 723 described above. In addition, the micro-projection device further comprises an optical waveguide 73. The optical waveguide 73 includes an in-coupling unit 731 and an out-coupling unit 732.
Light from the micro light emitting diode 722 enters the in-coupling unit 731 and is emitted from the out-coupling unit 732 through the optical waveguide 73. The in-coupling unit 731 and the out-coupling unit 732 may be gratings, e.g. bragg gratings.
As shown in fig. 7, the controller 71 controls the mems scanner 721 and the micro light emitting diode 732 to generate an image. The generated image is converged to the in-coupling unit 731 of the optical waveguide 73 by the micro-optical device 733. The incident coupling unit 731 couples image light into the optical waveguide 73, and the image light is propagated in the optical waveguide 73 to the exit coupling unit 732. The outcoupling unit 732 couples the image light out of the optical waveguide 73. The coupled-out image light can be viewed by the human eye.
The foregoing is merely a specific implementation of the embodiments of this disclosure, and it should be noted that, for a person skilled in the art, several improvements and modifications may be made without departing from the principles of the embodiments of this disclosure, and these improvements and modifications should also be considered as protective scope of the embodiments of this disclosure.
Claims (7)
1. A micro-projection device, comprising:
a microelectromechanical system scanner;
a micro light emitting diode disposed on a rotating surface of the mems scanner; and
micro-optics disposed on the micro light emitting diode,
wherein light emitted by a plurality of the micro light emitting diodes is converged to a common focal point by a micro optical device,
wherein the micro-optical device is a micro-lens formed on the micro-light emitting diode by photoetching, etching and coating,
wherein, when the MEMS scanner rotates, the micro light emitting diode positioned on the rotating surface also rotates, thereby scanning out the image line of the image to be projected,
wherein the rotation surface rotates in a first direction of an image to be projected and the micro light emitting diodes are arranged in a micro light emitting diode array on the rotation surface in a second direction of the image to be projected,
wherein the micro light emitting diode array comprises a plurality of micro light emitting diodes, and a plurality of micro light emitting diodes positioned in the same row in the plurality of micro light emitting diodes are confocal in an image plane to form one pixel of the image, and
the rotating surface is provided with a V-shaped surface, so that the micro light emitting diodes positioned in the same row are confocal in an image plane.
2. The micro-projection device of claim 1, further comprising an optical waveguide,
wherein the optical waveguide comprises an incident coupling unit and an emergent coupling unit,
wherein light from the micro light emitting diode enters the incoupling unit and is emitted from the outcoupling unit through the optical waveguide.
3. The micro-projection device of claim 1, wherein the micro-led columns comprise a plurality of columns of micro-leds that form a plurality of pixel columns of the image.
4. The micro-projection device of claim 1, wherein the plurality of columns of micro-leds comprises a red micro-led column, a green micro-led column, and a blue micro-led column, and micro-leds in a same row of the red micro-led column, the green micro-led column, and the blue micro-led column are confocal in an image plane to form one pixel of the image.
5. The micro-projection device of claim 1, wherein the micro-led column comprises a plurality of columns of micro-leds, and a plurality of micro-leds of the plurality of columns of micro-leds located in a plurality of columns and a plurality of rows are confocal in an image plane to form one pixel of the image.
6. The micro-projection device of claim 1, wherein a plurality of micro-leds in a column of micro-leds in the micro-led column are confocal at an image plane to form one pixel of the image.
7. An electronic device comprising the micro-projection device of claim 1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010587806.0A CN111885364B (en) | 2020-06-24 | 2020-06-24 | Micro-projection device and electronic device |
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| CN202010587806.0A CN111885364B (en) | 2020-06-24 | 2020-06-24 | Micro-projection device and electronic device |
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| CN111885364A CN111885364A (en) | 2020-11-03 |
| CN111885364B true CN111885364B (en) | 2023-08-15 |
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| CN111885364A (en) | 2020-11-03 |
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