CN115840295B - Linear array micro LED scans AR equipment - Google Patents
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- CN115840295B CN115840295B CN202310154631.8A CN202310154631A CN115840295B CN 115840295 B CN115840295 B CN 115840295B CN 202310154631 A CN202310154631 A CN 202310154631A CN 115840295 B CN115840295 B CN 115840295B
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Abstract
The invention relates to a linear array Micro LED scanning AR device, which comprises: a linear array pixel output unit for outputting continuous multi-frame column image data based on one frame of image data, for controlling an output time interval of the linear array pixel data based on one scanning period signal; the linear array light-emitting unit is used for receiving a column of image data and generating a plurality of light-emitting beams according to the column pixels; a collimating optical linear array for collimating a plurality of luminous beams emitted by the linear array luminous unit; a periodically moving reflective element for reflecting the collimated bar beam to scan within a predetermined angular range; focusing the imaging lens group, and irradiating the multiple beams in the preset direction to an imaging emergent unit after focusing; and the imaging emergent unit is used for outputting a two-dimensional scanning display imaging light beam. The device adopts the linear array light-emitting unit structure, so that the chip pixels are few, the chip area is small, the total volume is small, the chip yield is high, and the cost can be effectively reduced.
Description
Technical Field
The invention relates to the field of photoelectricity, in particular to linear array micro LED scanning AR equipment.
Background
With the development of optical imaging technology, in order to present clearer visual images, AR/VR devices have put forward higher requirements on imaging resolution, wherein technologies such as Micro LEDs and Mini LEDs are increasingly applied, the prior art discloses AR glasses based on Micro LEDs, display devices based on Micro LEDs are arranged on a glasses frame and in front of lenses, and are controlled by control devices arranged on the glasses legs, image contents can be displayed in a small screen by using Micro LEDs, images can be watched by using the Micro LEDs, the lenses adopt transparent lenses, and the visual images displayed by the Micro LEDs are transmitted to positions of front glasses by using optical waveguide devices and are projected to eyes of people. People can watch the video and simultaneously watch the view outside the glasses; however, if MicroLED (Micro Light Emitting Diode Display) is made into AR glasses, it is limited by the chip target surface on the glasses, too many pixels cannot be accommodated on the chip, and thus it is difficult to provide high resolution. For example, if a 4K resolution is to be achieved, 800 tens of thousands of pixels need to be accommodated on the glasses. If 8K resolution is to be achieved, 3300 ten thousand pixels of dots are to be accommodated. Therefore, the chip size is too large and the eyeglass frame is difficult to accommodate.
Disclosure of Invention
In order to solve the technical problem, the invention provides a linear array Micro LED scanning AR device which can be installed on a head-mounted AR device, comprising:
a linear array Micro LED scanning AR device mounted on a head-mounted AR device, comprising:
a linear array pixel output unit configured to output continuous multi-frame column image data based on one frame of image data, the each frame of column image data corresponding to one column of linear array pixels;
the linear array pixel output unit also comprises a linear array pixel scanning interval control unit which is used for controlling the output time interval of the linear array pixel data based on a scanning periodic signal;
the linear array light-emitting unit is used for receiving a column of image data and generating a plurality of light-emitting beams according to the column pixels;
the collimating optical linear array is arranged behind the linear array light-emitting unit and is used for collimating a plurality of light-emitting beams emitted by the linear array light-emitting unit;
a periodically moving reflection element which rotates based on a synchronization control signal, periodically reflects the collimated bar-shaped light beam to a preset direction, and scans the bar-shaped light beam within a preset angle range;
focusing the imaging lens group, and irradiating the multiple beams in the preset direction to an imaging emergent unit after focusing;
and the imaging emergent unit is used for outputting a two-dimensional scanning display imaging light beam.
Further, the linear array pixel output unit is configured to output continuous multi-frame column image data based on one frame of image data, and specifically includes:
and outputting one frame of image into multi-frame column image data according to rows or columns, wherein the number of pixels of the column image data is the same as the number of sub-light-emitting units in the linear array light-emitting units, and each pixel corresponds to one sub-light-emitting unit.
Further, the linear array light emitting unit is a Micro LED pixel linear array.
Furthermore, the collimating optical linear array is a wafer-level optical linear array and comprises a micro lens group linear array or an integrating rod linear array.
Further, the period of the rotational motion of the periodically moving reflective element is positively correlated with the frame rate.
Further, the method further comprises the following steps: and the optical sensing synchronization units are arranged at two sides of the angle range of the emergent light beam of the focusing imaging lens and are used for generating synchronization signals, and the synchronization signals trigger the refreshing of image frame data.
Furthermore, the imaging emergent unit is a semi-transparent and semi-reflective unit or a refractive imaging unit,
the semi-transparent and semi-reflective unit is an array optical waveguide, a diffraction optical waveguide or a holographic optical waveguide;
the refraction imaging unit adopts a prism.
Further, the light beam emitted by the imaging emergent unit is directly irradiated to eyes of an observer, and an amplified virtual image is obtained as an imaging result.
Further, the focusing imaging lens group comprises an imaging projection lens and a focal depth adjusting column lens; the focal length of the light beam emitted to the imaging emission unit is adjusted by the focal depth adjusting cylindrical lens.
Further, the method further comprises the following steps:
and the motion control mechanism is used for installing the periodic motion reflecting element and receiving a synchronous control signal to control the swinging or rotating speed of the periodic motion reflecting element.
Advantageous effects
The linear array Micro LED scanning AR device adopts a linear array scanning mode, and the cross section of the joint of the glasses frame and the lenses is of an elongated rectangle, so that the linear array Micro LED chips can be easily accommodated. Therefore, there are the following advantages: firstly, the invention has small volume, the chip shape is the same as the cross section of the joint of the lens and the lens frame, and the area of the linear array chip is only one thousandth of the area array. And secondly, the chip has few pixels, small chip area, high yield and low cost. The area array Micro LED 4K needs 800 ten thousand pixels, for example, the linear array Micro LED only needs 4000 pixels, the area array Micro LED 8K needs 3300 ten thousand pixels, for example, the linear array Micro LED only needs 8000 pixels. Therefore, the chip area is greatly reduced, and the cost is greatly reduced. Meanwhile, compared with 800 ten thousand pixels, 4000 pixels are easier to process, the final chip yield is higher, and the cost is further greatly reduced.
Drawings
FIG. 1 is a schematic diagram of a linear array Micro LED scanning AR device of the invention;
FIG. 2 is a schematic view of a portion of an optical path in an embodiment of the present invention;
fig. 3 is a flow chart of the speed adaptation control of the present invention.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without the inventive effort based on the embodiments of the present invention are within the scope of protection of the present invention.
According to an embodiment of the present invention, a linear array Micro LED scanning AR device is provided, where the AR device may be applied to a head-mounted AR device to implement head-mounted display, and specifically includes:
a linear array pixel output unit 9 for outputting continuous multi-frame column image data based on one frame of image data; the frame of image data is from video source data, for example, a series of image frames in video stream data generated after decoding a local or network video signal;
a linear array light emitting unit 1 for receiving a column of image data and generating a plurality of light emitting beams according to pixel correspondence; the array light-emitting unit is formed by arranging M sub light-emitting units with the same structure, and further comprises a signal input interface for receiving a column of pixel data, wherein the column of pixel data comprises M pixel data which respectively correspond to each sub light-emitting unit;
in the embodiment of the invention, the linear array light emitting unit is a Micro LED pixel linear array;
the linear array light emitting unit 1 receives the column image data output by the linear array pixel output unit after extracting each frame image according to the rows or columns, so that the number of pixels of the column image data is required to be the same as the number of sub light emitting units in the linear array light emitting unit, and each pixel corresponds to one sub light emitting unit. In one embodiment, each column of image data is required to be converted, and the column of image data is interpolated and extracted according to the pixel number of the column of image, so as to obtain final column of image data of M pixels;
optionally, in an embodiment, a collimating optical linear array 2 is disposed behind the linear array light emitting unit, and the collimating optical linear array 2 is configured to collimate light emitted by the linear array light emitting unit, so that light emitted by the linear array light emitting unit is changed into a plurality of parallel light beams, and finally a strip light beam with a strip-shaped cross section is formed;
optionally, the collimating optical linear array 2 is a wafer-level optical linear array, including a Micro lens group linear array or an integrator rod linear array, and because the Micro LED light emitting unit in the present invention has a smaller size, in order to adapt to the size, a Micro lens linear array composed of Micro lenses is selected.
A periodically moving reflecting element 3 which rotates based on a synchronous control signal and periodically reflects the collimated bar-shaped light beam to a predetermined direction within a predetermined angle range
Scanning in the device; in an embodiment of the invention, said predetermined angular range +.>
To be set to +.>
；
The periodic motion reflecting element 3 is provided with a reflecting surface, and after the collimated bar-shaped light beam irradiates the reflecting surface, the reflecting surface reflects the bar-shaped light beam out along a preset direction, and the preset direction is related to the current angle of the reflecting surface;
in one embodiment, the periodic movement reflecting element 3 is controlled such that the bar-shaped light beam of each column image of one frame image is projected to a predetermined position of the periodic movement reflecting element, the corresponding bar-shaped light beam is reflected at an angle, during the movement of the periodic movement reflecting element, one frame image is projected to a predetermined position range of the periodic movement reflecting element from the first column image to the last column image, during the movement at the periodic movement reflecting element, the bar-shaped light beams are reflected at an increasing or decreasing angle, so that each column image of one frame image is reflected to one area in turn.
In this embodiment, the periodically moving reflecting element 3 may be a plane mirror, which is periodically oscillated;
in yet another embodiment, the periodically moving reflective element 3 may be a prism having K reflective surfaces, for example, a hexagonal prism, an eight-square prism, or the like, and the surface between each two prisms is used as a reflective surface, and the prism is periodically rotated;
as shown in fig. 2, the periodically moving reflective element 3 is an eight-prism having 8 reflective surfaces, each cylindrical surface 31 being a reflective surface, assuming that the frame rate of the video image is
Then, the rotation period of the periodically moving reflective element 3 +.>
Assuming that the frame rate is 32 frames per second, the rotation period of the periodically moving reflective element 3 is +.>
Second, corresponding rotation frequency
；
In this embodiment, by controlling the periodically moving reflective element 3 such that the bar-shaped light beam of the first column image of one frame image is projected to the predetermined position of the start end of the periodically moving reflective element, and the last columnThe strip-shaped light beams of the images are projected to the preset tail end position of the periodical motion reflecting element, one frame of image is sequentially projected from the first column of images to the last column of images to the position range between the preset tail end position and the preset tail end position of the periodical motion reflecting element in the motion process of the periodical motion reflecting element, meanwhile, when the first column of images are projected to the preset tail end position in the motion state, the corresponding strip-shaped light beams are reflected according to a first angle, the other subsequent columns of images are reflected according to a second angle in the motion process of the periodical motion reflecting element in an increasing or decreasing angle, and the last column of images are reflected according to the second angle, so that each column of images of one frame of images is sequentially reflected to an area which is positioned in the range between the first angle and the second angle. The predetermined position of the start end is, for example, a position away from the start end edge L, and the predetermined position of the end is, for example, a position away from the end edge
A location of the site; in one embodiment, for example, the diameter of the inscribed circle of the octagon is +.>
Then +.>
：
Wherein e is an adjustment coefficient, and is 0.1 to 0.2, for example, if
Said->
A value of about 0.3-0.6mm, by means of which the reflection of the radiation of the strip beam onto the periodically moving reflecting element 3 can be controlledThe size of the area on the plane of incidence is controlled so as to control the size of the predetermined angular range in the range between the first angle and the second angle, so that the projected image finally falls within a proper visual field range in the visual field of the user.
The period of the wobbling motion or the period of the rotational motion of the periodically moving reflective element 3 has a correspondence with the frame rate of the image frame. When the frame rate of the image frames is required to be increased, the corresponding swing period or rotation period is also increased synchronously;
the periodic motion reflecting element 3 is arranged on the motion control mechanism 4, and the motion control mechanism 4 comprises a driving motor as a rotation control mechanism or is provided with a swing control mechanism for driving the periodic motion reflecting element to swing periodically; and receives a synchronous control signal to control the rotation speed of the periodically moving reflective element.
The linear array light emitting unit and the collimating optical linear array are used for obtaining the bar-shaped light beams emitted by the array image data, and further, the linear array pixel output unit 9 is used for decomposing the frame image into a series of multi-array image data, and the multi-array image data is emitted into a preset display area through the linear array light emitting unit 1, the collimating optical linear array 2 and the periodical motion reflecting element 3, so that a complete frame image and video can be formed.
Furthermore, in order to accurately control the corresponding relation between the swinging period or the rotating motion period of the periodic motion reflecting element and the image frame, the linear array pixel output unit 9 of the present invention is further provided with a speed control adaptive unit 90, a scanning speed calculating unit 91 and a linear array pixel scanning interval control unit 92;
the linear array pixel output unit 9 is connected with the motion control mechanism 4, and the speed adaptation control unit 90 is used for sending a motion speed control command to the motion control mechanism 4 and controlling and starting each frame of image processing;
the above-mentioned scanning speed calculating unit 91 can calculate the frame rate based on the current preset playing speed, and obtain the scanning speed, that is, the number of frame images to be scanned per second, further calculate the swing period or the rotation movement period of the periodic movement reflecting element, and send the scanning control signal to the movement control mechanism 4, and the movement control mechanism 4 controls the periodic movement reflecting element to perform the corresponding movement based on the scanning control signal.
A linear array pixel scanning interval control unit 92 for controlling an output time interval of the linear array pixel data based on a scanning period signal; in the present embodiment, the scanning period T refers to the scanning time of one frame image, including the duration from the first column image to the last column image, and when the frame rate of the image is low, the rotation speed of the corresponding periodic motion reflecting element becomes slow, and the rotation period of the periodic motion reflecting element becomes short
The scanning period T is increased and thereby the linear array pixel scanning interval control unit 92 adjusts the output time interval +_ of the linear array pixel data based on the above scanning period>
N is the number of columns of images, or the number of column images, such that it covers the entire scan period. The linear array pixel scanning interval control unit 92 controls the time interval of the linear array pixel output unit 9 outputting the linear array pixels (column images), and then outputs corresponding column pixel data to the linear array pixel output unit 9 according to the time interval so as to emit light to generate a column image light signal; further, the imaging lens group is used for focusing the bar-shaped scanning light beams in the preset direction and then irradiating the bar-shaped scanning light beams to the imaging emergent unit 6;
the focusing imaging lens group 5 includes an imaging projection lens 51 and a focal depth adjusting lens 52, as shown in fig. 2;
and an imaging emission unit 6 for adjusting the focal length of the light beam emitted from the imaging emission unit 6 by the focal depth adjusting cylindrical lens.
Referring to fig. 3, the imaging projection lens 51 is a convex lens, one surface of the focal depth adjusting lens 52 is a plane, the other surface is a convex mirror, and the focusing imaging lens group 5 is used for adjusting the projection focal length; alternatively, the imaging projection lens 51 and the depth of focus adjustment lens 52 may each be provided as a convex lens, or the imaging projection lens 51 may be provided as a convex lens, and the depth of focus adjustment lens may be provided as a cylindrical lens.
The scanning periodic signal light sensing synchronization unit 10 is installed at two sides of a predetermined angle range of the light beam emitted by the focal depth adjusting cylindrical lens 52 and is used for generating a synchronization signal, wherein the synchronization signal triggers the refreshing of image frame data, that is, each frame of video image can be cached in a storage queue, and when the synchronization signal is received, the storage queue is triggered to output the next frame of image frame to the linear array pixel output unit 9. The scanning period signal light sensing synchronization unit 10 may be a photosensor, and when the last column of images is scanned, or after scanning, the bar-shaped light beam irradiates the photosensor to generate a synchronization signal.
Referring to fig. 3, a series of image frames externally input to the line-array pixel output unit 9 are stored in a buffer queue, and after the speed adaptation control unit 90 transmits the nth frame of image data to the line-array pixel scanning interval control unit 92, it waits for the next frame synchronizing signal;
when receiving the synchronization signal sent by the light sensing synchronization unit 10, the n+1st frame of image data is extracted from the buffer queue and sent to the linear array pixel scanning interval control unit 92; if the synchronous signal is not received, continuing waiting and circularly judging;
extracting the n+1st frame image data from the buffer queue and transmitting to the line-array pixel scanning interval control unit 92;
reading the current rotating speed from the motion control mechanism, and judging whether the current rotating speed is normal or not;
if the pixel is normal, the linear array pixel output unit outputs the column images according to the time interval; otherwise, sending a rotation speed adjusting command to the motion control mechanism, and continuing to judge whether the current rotation speed is normal or not;
the step of judging whether the current rotation speed is normal is to judge whether the rotation speed is within a preset range, and a threshold range is set for each frame rate, for example, for a frame rate of 32 frames per second, whether the rotation speed is between 3.8 and 4.2 rotations per second.
The imaging emergent unit 6 is a semi-transparent and semi-reflective unit or a refraction imaging unit and is used for outputting two-dimensional scanning display imaging light beams.
Optionally, the semi-transparent and semi-reflective unit is an array optical waveguide, a diffraction optical waveguide or a holographic optical waveguide;
the refraction imaging unit adopts a prism.
The imaging emergent unit irradiates the eyes of the observer after reflecting the light beams emergent from the cylindrical lens through the reflection focal depth adjustment, and preferably, the virtual image of the reflected light beams observed by the eyes is obtained as an imaging result through adjusting the convergence angle of the emergent light beams emergent from the imaging emergent unit. Through the technical scheme, the high-definition video imaging can be realized in a limited area on the lens, and meanwhile, the high-definition imaging is realized by adopting the linear array light-emitting unit for scanning, so that the device has the advantage of small volume, the cross section of the joint of the chip shape and the lens frame is the same, and the area of the linear array chip is only one thousandth of that of the area array. In addition, the number of chip pixels is small, the chip area is small, the yield is high, and the cost is low.
The area array Micro LED 4K needs 800 ten thousand pixels, for example, the linear array Micro LED needs 4000 pixels, the area array Micro LED 8K needs 3300 ten thousand pixels, for example, the linear array Micro LED needs 8000 pixels. Therefore, the chip area is greatly reduced, and the cost is greatly reduced. Meanwhile, compared with 800 ten thousand pixels, 4000 pixels are easier to process, the final chip yield is higher, and the cost is further greatly reduced.
While the foregoing has been described in relation to illustrative embodiments thereof, so as to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, but is to be construed as limited to the spirit and scope of the invention as defined and defined by the appended claims, as long as various changes are apparent to those skilled in the art, all within the scope of which the invention is defined by the appended claims.
Claims (8)
1. Linear array Micro LED scans AR equipment, its characterized in that installs on wear-type AR equipment, includes:
a linear array pixel output unit for outputting continuous multi-frame column image data based on one frame of image data, wherein each frame of column image data corresponds to one column of linear array pixels; outputting a frame of image into multi-frame column image data according to rows or columns, wherein the number of pixels of the column image data is the same as the number of sub-light-emitting units in a linear array light-emitting unit, and each pixel corresponds to one sub-light-emitting unit;
the linear array pixel output unit also comprises a linear array pixel scanning interval control unit which is used for controlling the output time interval of the linear array pixel data based on a scanning periodic signal;
the linear array light-emitting unit is used for receiving a column of image data and generating a plurality of light-emitting beams according to the column pixels;
the collimating optical linear array is arranged behind the linear array light-emitting unit and is used for collimating a plurality of light-emitting beams emitted by the linear array light-emitting unit;
a periodically moving reflection element which rotates based on a synchronization control signal, periodically reflects the collimated bar-shaped light beam to a preset direction, and scans the bar-shaped light beam within a preset angle range; specifically, the periodically moving reflecting element is an eight prism with K reflecting surfaces, the surface between every two prisms is used as a reflecting surface, and the eight prism periodically rotates;
by controlling the eight prisms, the bar-shaped light beam of the first column image of one frame image is projected to a preset position at the beginning end of the eight prisms, and the bar-shaped light beam of the last column image is projected to a preset position at the tail end of the eight prisms;
the preset position of the starting end is a position away from the starting end edge L, and the preset position of the tail end is a position away from the tail end edge L; the diameter D of the inscribed circle of the octagon is calculated as L according to the following formula:
the method comprises the steps of carrying out a first treatment on the surface of the Wherein e is an adjustment coefficient, and the value is 0.1-0.2, and the size of the area of the strip-shaped light beam irradiated on the reflecting surface of the periodically moving reflecting element can be controlled through the preset position, so that the size of the preset angle range in the range from the first angle to the second angle is controlled, and the projected image finally falls on the userWithin a suitable field of view;
focusing the imaging lens group, and irradiating the multiple beams in the preset direction to an imaging emergent unit after focusing;
and the imaging emergent unit is used for outputting a two-dimensional scanning display imaging light beam, and the light beam emergent by the imaging emergent unit is directly irradiated to eyes of an observer to obtain an amplified virtual image as an imaging result.
2. The linear array Micro LED scanning AR device according to claim 1, comprising:
the linear array light emitting unit is a Micro LED pixel linear array.
3. The linear array Micro LED scanning AR device according to claim 1, wherein the collimating optical linear array is a wafer-level optical linear array, and includes a Micro lens group linear array.
4. The linear array Micro LED scanning AR device according to claim 1, characterized in that the period of the rotational movement of the periodically moving reflective element is positively correlated with the frame rate.
5. The linear array Micro LED scanning AR device according to claim 1, further comprising:
and the optical sensing synchronization units are arranged at two sides of the angle range of the emergent light beam of the focusing imaging lens and are used for generating synchronization signals, and the synchronization signals trigger the refreshing of image frame data.
6. The linear array Micro LED scanning AR device according to claim 1, wherein:
the imaging emergent unit is a semi-transparent semi-reflective unit or a refractive imaging unit,
the semi-transparent and semi-reflective unit is an array optical waveguide, a diffraction optical waveguide or a holographic optical waveguide;
the refraction imaging unit adopts a prism.
7. The linear array Micro LED scanning AR device according to claim 1, wherein:
the focusing imaging lens group comprises an imaging projection lens and a focal depth adjusting column lens; the focal length of the light beam emitted to the imaging emission unit is adjusted by the focal depth adjusting cylindrical lens.
8. The linear array Micro LED scanning AR device according to claim 1, further comprising:
and the motion control mechanism is used for installing the periodic motion reflecting element and receiving a synchronous control signal to control the swinging or rotating speed of the periodic motion reflecting element.
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| CN106950700A (en) * | 2017-05-17 | 2017-07-14 | 上海鲲游光电科技有限公司 | A kind of augmented reality eyeglass device of micro- projector's separation |
| US20190098267A1 (en) * | 2017-09-27 | 2019-03-28 | Microsoft Technology Licensing, Llc | Hololens light engine with linear array imagers and mems |
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| CN102068236A (en) * | 2010-12-17 | 2011-05-25 | 中国科学院光电技术研究所 | Line-scanning confocal ophthalmoscope system based on laser diffraction and method |
| CN113534484A (en) * | 2020-03-31 | 2021-10-22 | 华为技术有限公司 | Light emitting device and electronic equipment |
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