WO2022141947A1 - Machine de projection optique et procédé de commande associé, et dispositif de projection - Google Patents

Machine de projection optique et procédé de commande associé, et dispositif de projection Download PDF

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Publication number
WO2022141947A1
WO2022141947A1 PCT/CN2021/087226 CN2021087226W WO2022141947A1 WO 2022141947 A1 WO2022141947 A1 WO 2022141947A1 CN 2021087226 W CN2021087226 W CN 2021087226W WO 2022141947 A1 WO2022141947 A1 WO 2022141947A1
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Prior art keywords
display
projection
scanning
pixels
light
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PCT/CN2021/087226
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English (en)
Chinese (zh)
Inventor
卢增祥
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亿信科技发展有限公司
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Publication of WO2022141947A1 publication Critical patent/WO2022141947A1/fr

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details

Definitions

  • the embodiments of the present application relate to the technical field of projection equipment, for example, to a projector light machine, a control method thereof, and a projection equipment.
  • DLP Digital Light Processing, digital light processing
  • liquid crystal projection technology wherein DLP technology is a digital micromirror device DMD (Digital Micromirror Device, digital micromirror mirror) developed by Texas Instruments. ) chip as an imaging device, a projection technology that realizes the projected image by adjusting the reflected light.
  • DMD Digital Micromirror Device, digital micromirror mirror
  • the single-chip DLP projection system adopts a reflective structure, especially in the low-end Among the products, the single-chip DLP projection system is slightly inferior to the three-primary-color mixed LCD (Liquid Crystal Display, liquid crystal display) projector in terms of image color reproduction, and the colors are not bright enough and vivid, and the color gamut is not enough.
  • the basic principle of liquid crystal projection is to use the LCD liquid crystal module to modulate the color light emitted by the light source and projected onto the screen. In order to accurately project the color of the image, it is necessary to separate the color of the light source into three colors: R, G, and B. They are combined into one and projected on the screen using a projection lens, with low resolution and insufficient brightness.
  • the pixels do not emit light, and the projection is performed by means of another light source illumination, that is, the projection light source and pixelization are realized in two parts, which will waste a lot of light energy in the re-graphic process, and the energy utilization rate is low.
  • laser scanning projector in the related art, such as microvision (laser micro projector), which uses strong laser fast and slow axis scanning projection, and the color and brightness are relatively good, but strong laser scanning will bring security problems, long time Scanning a little will cause the projection screen to be burnt out due to overheating, or cause damage to the human eye when looking directly at it.
  • microvision laser micro projector
  • the present application provides a light projector, a control method thereof, and a projection device, so as to realize high-brightness image projection during the projection process, and will not cause damage to human eyes when looking directly.
  • the embodiment of the first aspect of the present application proposes a light projector, including a display module and a projection lens, the projection lens is arranged on the light exit side of the display module, and the central axis of the display module is connected to the light of the projection lens.
  • the axes are parallel and do not overlap;
  • the display module includes a plurality of display pixels, and each of the display pixels corresponds to an initial projection pixel on the projection screen. During the projection process of the light projector, the display module is configured to perform a scanning motion, and each of the display pixels corresponds to an initial projection pixel on the projection screen.
  • the display pixels correspond to a display scan path on the projection screen, each of the display scan paths corresponds to a plurality of scan projection pixels, and the display scan paths cover the initial projection pixels and the scan projection pixels;
  • the plurality of display pixels include a first display pixel and a second display pixel. During the scanning motion of the display module, the direction of the first display pixel pointing to the second display pixel does not change.
  • the embodiment of the second aspect of the present application provides a control method for a light projector, which is applied to the light projector, including:
  • the display module is controlled to perform a scanning motion.
  • the embodiment of the third aspect of the present application provides a projection device, including at least two of the projectors; the projection device further includes:
  • an image acquisition unit configured to acquire projection images of at least two of the light projectors
  • the control unit is configured to adjust the outgoing image of each of the light projectors according to the projected images of at least two of the light projectors.
  • FIG. 1 is a schematic structural diagram of a light projector proposed by an embodiment of the present application.
  • Fig. 2 is the projection image of the light projector proposed by the embodiment of the present application.
  • 3 is a projection image of a light projector proposed by an embodiment of the present application.
  • FIG. 5 is a projection image of a light projector proposed by another embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a light projector proposed by another embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a light projector proposed by a specific embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a light projector proposed by another embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a light projector proposed by another specific embodiment of the present application.
  • FIG. 10 is a flowchart of a control method of a light projector proposed by an embodiment of the present application.
  • FIG. 11 is a projection image of a light projector in the control method of a light projector proposed by an embodiment of the present application;
  • FIG. 13 is a projection image of a light projector in a method for controlling a light projector proposed by another embodiment of the present application.
  • FIG. 14 is a block diagram of a projection device proposed by an embodiment of the present application.
  • FIG. 15 is a projection image of a projection device proposed by an embodiment of the present application.
  • FIG. 16 is an optical path diagram of a projection device proposed by a specific embodiment of the present application.
  • FIG. 1 is a schematic structural diagram of an optical projector proposed by an embodiment of the present application.
  • the projector includes a display module 101 and a projection lens 102.
  • the projection lens 102 is disposed on the light-emitting side of the display module 101, and the central axis oo' of the display module 101 is parallel to the optical axis pp' of the projection lens 102. and do not overlap;
  • the display module 101 includes a plurality of display pixels, and each display pixel corresponds to an initial projection pixel on the projection screen 103. During the projection process of the light projector, the display module 101 scans and moves, and each display pixel corresponds to an initial projection pixel on the projection screen 103. Display scan paths, each display scan path corresponds to multiple scan projection pixels, and the display scan path covers the initial projection pixels and the scan projection pixels;
  • the direction of the first display pixel in the display module 101 pointing to the second display pixel remains unchanged, and the first display pixel and the second display pixel are any two display pixels in the display module 101 .
  • the central axis oo' of the display module 101 is parallel to and does not overlap with the optical axis pp' of the projection lens 102, wherein, as shown in FIG. 1, the distance between oo' and pp' is H, which is understandable Yes, the value of H is greater than 0.
  • the display module 101 includes a plurality of display pixels, and the aperture ratio of the plurality of display pixels is not 100%, and there is a gap between adjacent display pixels.
  • the luminous surface is proportionally enlarged, resulting in too large pixel pitch of the picture and reduced resolution.
  • the display module 101 performs a scanning motion, so that the display pixels of the display module 101 can correspond to a display scanning path on the projection screen 103, and each display scanning path corresponds to a plurality of scanning projection pixels, and the display scanning path covers the initial projection pixel and the scanning projection pixel. . Therefore, the display scanning path fills the interval between adjacent projected pixels, so that the resolution of the projected image is improved and the image quality is improved.
  • the value of H is greater than 0, which can ensure that the display pixels located on the central axis oo' in the display module 101 can also correspond to a display scanning path on the projection screen 103 during the projection process of the light projector to fill the gap between the projection pixels Therefore, when the display module 101 performs a scanning motion, each display pixel in the display module 101 can fill the spaced area between the projection pixels, thereby increasing the resolution and brightness of the projection image.
  • the scanning motion of the display module 101 includes at least one of linear scanning motion, circular scanning motion, elliptical scanning motion, figure-8 scanning motion and Lissajous figure scanning motion.
  • the display scanning path of each display pixel in the display module 101 on the projection screen 103 is the image formed by the movement.
  • the scanning motion of the display module 101 is linear scanning motion (eg, linear fast and slow axis scanning)
  • the display scanning path of each display pixel on the projection screen 103 is, for example, a zigzag shape.
  • the scanning motion of the display module 101 is a circular scanning motion
  • the display scanning path of each display pixel on the projection screen 103 is a circle.
  • the scanning motion mode of the display module 101 is an elliptical scanning motion
  • the display scanning path of each display pixel on the projection screen 103 is an ellipse.
  • the scanning motion mode of the display module 101 is the 8-figure scanning motion
  • the display scanning path of each display pixel on the projection screen 103 is 8-figure.
  • the scanning motion of the display module 101 is a Lissajous figure scanning motion
  • the display scanning path of each display pixel on the projection screen 103 is a Lissajous figure.
  • the arrangement of display pixels in the display module 101 may be an m*n array arrangement.
  • the direction in which the first display pixel in the display module 101 points to the second display pixel remains unchanged, and the first display pixel and the second display pixel are any two display pixels in the display module 101 .
  • FIG. 3 is a projected image of a light projector proposed by an embodiment of the present application.
  • the circular scanning radius of the display module 101 is the distance H between the central axis oo' and the optical axis pp', wherein the direction of the first display pixel in the display module 101 pointing to the second display pixel is unchanged.
  • the first projection pixel A in FIG. 3 is the first projection pixel A corresponding to the first display pixel when the display module 101 does not perform scanning motion, that is, the initial projection pixel position corresponding to the first display pixel.
  • the second projection pixel B is the second projection pixel B corresponding to the second display pixel when the display module 101 does not perform scanning motion, that is, the initial projection pixel position corresponding to the second display pixel.
  • the display module 101 takes the optical axis pp' of the projection lens as the central axis and the radius is H to perform a translational circular motion.
  • the display scanning path of the second display pixel in the display module 101 on the projection screen 103 is a circle with a radius of H, which is the curve 2, the display scanning path of the third display pixel on the projection screen 103 is the curve 1, and the fourth display pixel is the curve 1.
  • the display scanning path on the projection screen 103 is curve 3, wherein the display scanning path of the third display pixel on the projection screen 103 covers part of the display scanning path curve 2 of the second display pixel on the projection screen 103, in other words,
  • the partial curve 2 of the display scan path of the second display pixel on the projection screen 103 fills the area curve 1 defined by the display scan path of the third display pixel on the projection screen 103, so that the interval between the display pixels in the display module 101 is During the scanning motion of the display module 101, it is filled by the display scanning path of each other display pixel, thereby improving the resolution of the projected image.
  • 4 is a projection image of the optical projector proposed by another embodiment of the present application
  • FIG. 5 is a projected image of the optical projector proposed by another embodiment of the present application. As shown in FIGS.
  • the radius H1 of the circular scanning motion performed by the display module 101 in FIG. 4 is smaller than the radius H of the circular scanning motion performed by the display module 101 in FIG. 3
  • the radius H2 of the circular scanning motion performed by the display module 101 in FIG. 5 It is larger than the radius H of the circular scanning motion of the display module 101 in FIG. 3 .
  • the fifth and fourth curves both contribute to the interval between adjacent projected pixels, but the contribution is small, and the second curve fills the area defined by the first curve, The third curve does not fill the area defined by the first curve. Obviously, the contribution of the second curve and the first curve to the interval filling between adjacent projected pixels is greater than that of the fifth curve and the fourth curve in Figure 4.
  • FIG. 6 is a schematic structural diagram of a light projector proposed by another embodiment of the present application.
  • the display module 101 includes a display panel 1011; the central axis of the display panel 1011 is parallel to the optical axis of the projection lens 102 and does not overlap;
  • the display panel 1011 moves.
  • the display panel 1011 includes a micro light emitting diode display panel, or a vertical cavity surface emitting laser display panel, or a quantum dot display panel.
  • the display panel 1011 is provided with a plurality of display pixels, the central axis qq' of the display panel 1011 makes a circular motion around the optical axis pp' of the projection lens 102, and the display panel 1011 includes a miniature light-emitting diode display panel, or a vertical cavity surface A laser-emitting display panel, or a quantum dot display panel, the display pixels included in the aforementioned display panel 1011 have high brightness, and the display panel 1011 performs a circular scanning motion, and the imaging trajectory of the display pixels on the display panel 1011 on the projection screen 103 is also a circle. , the imaging track can fill the interval between adjacent pixels, so that after the display pixels of the display panel 1011 pass through the projection lens 102, the image on the projection screen 103 also has high brightness, and will not hurt when the human eye looks directly human eye.
  • the resolution of the display panel 1011 is K*K, and the resolution of the two display panels 1011 is 2K*K, because the distance between the display pixels on the edge of the display panel and the edge of the display panel may not be able to be determined.
  • L pixels need to be subtracted, and finally, the resolution of the projection image of the display panel 1011 on the projection screen 103 is (2K-L)*N; (K-L)*N.
  • the value of L can be determined according to the distance between the central axis qq' of the display panel 1011 and the optical axis pp' of the projection lens 102.
  • the difference between the central axis qq' of the display panel 1011 and the optical axis pp' of the projection lens 102 The larger the distance between the display pixels, the larger the area covered by the distance between the display pixels on the edge of the display panel and the edge of the display panel, and the smaller the value of L is.
  • the central axis qq' of the display panel 1011 and the optical axis pp of the projector lens The smaller the space between ', the smaller the area covered by the interval between the display pixels at the edge of the display panel and the edge of the display panel, and the larger the value of L.
  • the final resolution of the projection image of the display panel 1101 on the projection screen 103 is 2478*1134.
  • FIG. 7 is a schematic structural diagram of a light projector proposed by a specific embodiment of the present application.
  • the display panel 1011 can be installed on the gear or bearing 105, the motor 104 can be used to drive the display panel 1011 fixed on the gear or bearing 105 to move through the transmission device, or other In this way, the display panel 1011 is driven to perform a scanning motion.
  • the movement of the display panel 1011 can accelerate the heat dissipation of the display panel 1011 .
  • FIG. 8 is a schematic structural diagram of a light projector proposed by another embodiment of the present application.
  • the display module 101 includes a display panel 1011 and a scanning lens 1012; the optical axis rr' of the scanning lens 1012 is parallel to and does not overlap with the optical axis pp' of the projection lens 103;
  • the display panel 1011 is fixed, and the scanning lens 1012 scans and moves.
  • the central axis of the display panel 1011 may coincide with the optical axis of the projection lens 103 , so that the projection lens 102 can capture the light emitted from the display panel 1011 in a maximum range.
  • the optical axis rr' of the scanning lens 1012 and the optical axis pp' of the projection lens 102 can be parallel and do not overlap, so as to ensure that the display scanning path of each display pixel in the display panel 1011 on the projection screen 103 can be filled with other display pixels.
  • the area defined by the scanning path is displayed on the projection screen 103 to improve the resolution and brightness of the displayed image.
  • FIG. 9 is a schematic structural diagram of a light projector proposed by another specific embodiment of the present application.
  • the scanning lens 1012 is installed on the hollow rotating shaft 110
  • the hollow rotating shaft 110 is installed on the fixed bearing 109
  • the motor 108 drives the gear or the transmission belt 107 to drive the hollow rotating shaft 110 to rotate, and then drives the scanning lens 1012 to move
  • the optical center of the scanning lens 1012 performs a circular scanning motion around the optical axis pp' of the projection lens 103, the direction between any two points on the scanning lens 1012 remains unchanged, and the display scanning path of the display pixels of the display panel 1011 on the projection screen 103 Therefore, the display scanning path of each display pixel on the projection screen 103 can cover the initial projection pixel and the scanning projection pixel, which improves the resolution and brightness of the projection image.
  • a small fan blade can be installed on the edge of the hollow rotating shaft 110, and then the display panel 1011 can be dissipated during the scanning process of the scanning lens 1012.
  • the scanning lens 1012 is disposed in the optical path between the display panel 1011 and the projection lens 102;
  • the projection lens 102 includes a plurality of projection lenses, and the scanning lens 1012 is disposed in the optical path between any two adjacent projection lenses.
  • the scanning lens 1012 may be provided separately, or may be integrated in the projection lens 102 .
  • the scanning lens 1012 includes a plurality of sub-scanning lenses arranged in an array.
  • each display pixel in the display module corresponds to an initial Projection pixel
  • each display pixel in the display module corresponds to a display scanning path on the projection screen
  • each display scanning path corresponds to a plurality of scanning projection pixels
  • the display scanning path covers the initial projection pixel and the scanning path.
  • FIG. 10 is a flowchart of a control method for a light projector proposed by an embodiment of the present application.
  • the light projector to which the control method of the light projector is applied includes:
  • the display state includes the lighting time and display brightness of the display pixels
  • the display module includes a plurality of display pixels, each display pixel corresponds to an initial projection pixel on the projection screen, during the projection process of the light projector, the display module performs a scanning motion, and each display pixel corresponds to a display pixel on the projection screen Scanning paths, each display scanning path corresponds to a plurality of scanning projection pixels, and the display scanning path covers the initial projection pixels and the scanning projection pixels.
  • the display module performs a scanning motion, and the circular motion is still taken as an example for description.
  • the projection requirement refers to the projection image to be finally presented by the light projector on the projection screen.
  • the display state of each display pixel in the display module is controlled according to the projection image to be finally presented on the projection screen, wherein the display state includes the lighting time and display brightness of the display pixel.
  • the projection image to be presented on the projection screen will be pre-stored in the display module in advance.
  • the final projection images to be displayed on the projection screen are triangles and rectangles in sequence, that is, after the display pixels in the display module pass through the projection lens, the final images formed on the projection screen are triangles and rectangles in sequence, then, first of all The display pixels in the display module at the position corresponding to the triangular image are controlled to light up, and then the display pixels in the display module at the position corresponding to the rectangular image are controlled to light up.
  • FIG. 11 is a projection image of a light projector in the control method of a light projector proposed by an embodiment of the present application
  • FIG. 12 is a projected image of a light projector in the control method of a light projector proposed by an embodiment of the present application.
  • the black dots in Figure 11 are the imaging points of each display pixel of the display module on the projection screen when the display module does not perform scanning motion.
  • the display module is controlled to perform scanning motion , each display pixel corresponds to a display scan path on the projection screen, and each display scan path covers an area other than the initial projection position.
  • the spaced areas between adjacent pixels such as the area F and the area G, are passed by the display scanning paths of other display pixels, so that the area F and the area G are lit up, and further, the display is improved.
  • the resolution and brightness of the screen are improved.
  • the projection requirement may be to light up an area surrounded by image points formed by the original display module without scanning motion on the screen.
  • the following description will be given by taking the projection demand as an example that the area G is lit up. It can be understood that the fact that the area G is lit means that the area G is completely filled by the display scanning paths of other display pixels.
  • FIG. 12 only three display scanning paths, namely, the curve 11, the curve 12, and the curve 13, pass through the area G. , which is only used as an example for illustration. During the actual operation, it can be adjusted according to the distance between the image points, the circular radius of the scanning motion of the display module, etc., so that the area G is completely filled by the display scanning paths of other display pixels.
  • the display module when the projection requirement is only when the area G is lit, the display module only controls the display pixels whose display scanning path enters the area G to light up during the scanning motion, and controls the display pixels to turn off after the display scanning path passes through the area G. .
  • any point on the display scanning path is filled with initial projection pixels and/or scanning projection pixels;
  • the scanning motion stage of the display module includes N sub-scanning stages, and the area defined by the display scanning path includes N display frames; N ⁇ 2 and N is an integer;
  • controlling the display status of the display module includes:
  • the ith type display pixel corresponding to the ith display frame is controlled to light up; 1 ⁇ i ⁇ N and i is an integer;
  • the Nth type display pixels corresponding to the Nth display frame are controlled to light up.
  • the area G can be lit in frames.
  • the preset angle can be divided into two, three or four angles, that is, the scanning movement stage of the display module is divided into two , three or four sub-scanning stages
  • the area G includes N display frames. The following takes three sub-scanning stages as an example for description.
  • the scanning stage of the display module is divided into three sub-scanning stages, and the imaging interval G is divided into three sub-scanning regions.
  • the first sub-scanning stage the first type of display pixels corresponding to the first display frame are controlled.
  • control the second sub-scanning stage control the second-type display pixels corresponding to the second display frame to light up; in the third sub-scanning stage, control the third-type display pixels corresponding to the third display frame to light up.
  • the display scanning path of the display pixels can completely fill the pixel interval area G, and the positions of the scanning coverage points in the pixel interval area G will be distributed in 0-120 degrees, according to the movement angle of the display module. Differentiate the coverage points. Some points are covered at 0-40 degrees, some points are covered at 41-80 degrees, and some points are covered at 81-120 degrees. The number of times covered in each angle area may be once, two or three times, etc.
  • the lighting time of the point can only be covered when the display module circularly moves 0-40 degrees, and when a point is covered at other scanning angles other than 0-40 degrees (such as 41-80 degrees), at this time, you can choose an angle area to light up according to the amount of information of the two frames.
  • one angle area can be randomly selected. In this way, all the points in the imaging interval area G can be divided into three frames according to the angle.
  • the information displayed in the three frames is a picture of one frame, thereby realizing frame-by-frame display and preventing flickering.
  • the display state of the display module can be controlled according to the rotation angle of the motor.
  • the rotation angle of the motor corresponds to the scanning stage of the display module.
  • the motor rotates the first angle the first type of display pixels corresponding to the first display frame of the control display module are turned on, and when the motor rotates at the second angle, the second type of display pixels corresponding to the second display frame of the display module are controlled to light up
  • the motor rotates at a third angle the third type of display pixels corresponding to the third display frame of the display module are controlled to light up.
  • the rotation speed of the motor is 20 revolutions/S
  • the display module rotates 120 degrees to display a complete picture, then it can display the picture display frame rate of 60 frames/S, and the complete display screen of 120 degrees is divided into 40 degrees.
  • the display frame rate for one display frame, there can be a display frame rate of 180 frames/S.
  • any point on the display scan path corresponding to each display frame is lit once.
  • the imaging interval area G is divided into three sub-scanning areas.
  • the first sub-scanning stage the first type of display pixels corresponding to the first display frame are controlled to light up;
  • the second sub-scanning stage the second-type display pixels corresponding to the second display frame are controlled to light up;
  • the third sub-scanning stage the third-type display pixels corresponding to the third display frame are controlled to light up.
  • the 11th curve in the first sub-scanning stage, the 11th curve first passes through the region G, then the 13th curve passes through the region G, and finally the 12th curve passes through the region G.
  • the point a in the figure is illuminated
  • the point b in the figure is lit
  • the curve 12 passes through the area G
  • the point b in the figure is also lit, and other points are also lit twice, not one by one here. enumerate. In this way, the brightness of point a, the brightness of point b, and the brightness of other repeated points are brighter than the brightness of other points in the region G, resulting in inconsistent display brightness.
  • the display pixels include a first display pixel and a second display pixel, and each display pixel corresponds to a projection pixel on the projection screen;
  • the display module performs a scanning motion, each display pixel corresponds to a display scanning path on the projection screen, each display scanning path corresponds to a plurality of scanning projection pixels, and the display scanning path covers the initial projection pixel and scanning Projected pixels, including:
  • the display module performs a scanning motion to control the lighting time of the first display pixel and the second display pixel.
  • the first display pixel corresponds to the first display scanning path on the projection screen, and the first display scanning path Overlaps the projection pixels of the plurality of second display pixels on the projection screen.
  • FIG. 13 is a projection image of a light projector in a method for controlling a light projector proposed by another embodiment of the present application.
  • the display pixel includes a first display pixel and a plurality of second display pixels, wherein the first display pixel is the first display pixel, the plurality of second display pixels are the second to eighth display pixels, and the second display pixel is the second display pixel.
  • the projected pixels from the eighth display pixel on the projection screen overlap with the first display scan path corresponding to the first display pixel on the projection screen, in other words, the projected pixels of the second to eighth display pixels on the projection screen Both are on the first display scanning path corresponding to the first display pixels on the projection screen.
  • the display pixels corresponding to the other seven projection pixels on the display path of the first display pixel are simultaneously lit. Therefore, under the same brightness, the refresh frequency of the display module can be reduced, the projection resolution and brightness can be kept unchanged, and the power consumption of the display module can be reduced.
  • the display state of the display pixels is controlled according to the projection requirements, and during the projection process of the light projector, each display pixel in the display module is projected during the projection process.
  • the screen corresponds to a display scanning path, each display scanning path corresponds to a plurality of scanning projection pixels, and the display scanning path covers the initial projection pixels and the scanning projection pixels so that the projection image has high resolution and high brightness.
  • FIG. 14 is a block diagram of a projection device proposed by an embodiment of the present application. As shown in Figure 14, the projection device includes at least two projectors; the projection device further includes:
  • the image acquisition unit 113 is configured to acquire projection images of at least two projectors
  • the control unit 114 is configured to adjust the outgoing image of each light projector according to the projected images of the at least two light projectors.
  • the projection device includes a first light projector 111 , a second light projector 112 , an image acquisition unit 113 and a control unit 114 .
  • the first light projector 111 , the second light projector 112 and the image acquisition unit 113 are respectively connected to the control unit 114 , and the control unit 114 adjusts the first light projector 111 and the second light projector according to the images collected by the image acquisition unit 113 The outgoing image of the machine 112 .
  • the image acquisition unit 113 includes a camera or a camera.
  • the brightness and resolution of the projector are very important parameters. In this application, because it is a scanning imaging projection, the resolution can be very high. Because the brightness of the MicroLED chip is as high as 10 million nits, the brightness of the picture projected on the screen meets the needs of normal viewing. When it needs to be displayed in a brighter occasion, the application can superimpose multiple projectors to increase the projection brightness. Or when two or more chips are scanned and imaged overlapping, controlling the lighting state of the pixels of the display panel and the rotation state of the motor can realize the stepless doubling of the projection brightness or the projection area without losing the resolution, and realize the ultra-high brightness projection.
  • the projection images of the at least two light projectors completely overlap
  • the control unit 114 is configured to adjust the synchronous projection display of the at least two light projectors according to the projected images of the at least two light projectors.
  • the first projection image emitted by the first projector 111 completely overlaps with the second projection image emitted by the second projector 112, and the image acquisition unit 113 captures the first projection image and the second projection.
  • the control unit 114 readjusts the first projection image and the second projection image emitted by the first projection light machine 111 according to the difference between the first projection image and the second projection image.
  • Two second projection images output by the light projector 112 It can be known that the second projection image emitted by the second projector 112 can only be adjusted based on the first projected image, or the first projected image emitted by the first projector 111 can be adjusted based on the second projected image.
  • the image acquisition unit 113 can be set to detect the projection quality and feedback the signal when multiple projectors are synchronously projected. When there is a deviation, a signal will be transmitted to the control unit 114 in time, and the control unit 114 will adjust the outgoing image of the projector according to the received signal.
  • scanning projection enables the projector to have super high resolution, which is the basis for superimposed display. Only super high display resolution can ensure that pixels of different projectors can be superimposed correspondingly during superposition.
  • the image acquisition unit 113 can also provide a projection correction signal to the control unit 114 to non-linearly correct the projection image surface according to the display condition of the projection surface.
  • the projected image edges of at least two light projectors overlap
  • the control unit 114 is configured to adjust the spliced projection display of the at least two light projectors according to the projected images of the at least two light projectors.
  • FIG. 15 is a projection image of a projection device proposed by an embodiment of the present application.
  • the splicing of multiple projectors realizes the plan to increase the projection area.
  • the projection display splicing and projection fusion technology are relatively mature, but most of these technologies are realized by the superposition of the projection area, which will lose the projection light to a certain extent.
  • the splicing is realized without losing the resolution of the projector, and it is realized by superimposing the area where the edges are not completely scanned in the scanning scheme. Taking four projectors as an example, four projectors are used for projection.
  • the projection area of the projector has a partially overlapping area, which is the splicing area 116 shown in the figure below, and this area 116 is the edge area of the projector.
  • this area 116 is the edge area of the projector.
  • the incomplete coverage areas of adjacent projectors overlap each other to form an overlapping area, and the overlapping of scanning to form a splicing area can form a complete coverage, and finally realize the splicing display without wasting the edge area of the projector scanning.
  • the projected display area is increased.
  • the data shown in Table 1 is the data of the projection lens of the projector, the equivalent focal length of which is 21mm-23.1mm, and the projection size at 2m is 53 inches.
  • the display panel is far from the projector. The distance is about 21.2mm.
  • a scanning lens is added in front of the projection lens. When the scanning lens is installed, its optical axis is at a certain distance from the optical axis of the projection lens, that is, the polarized axis of the scanning lens is installed. Taking the lens focal length of 30mm as an example, it is calculated according to the formula for calculating the equivalent focal length of the lens combination. Where f1 is the equivalent focal length of the projection lens, f2 is the focal length of the scanning lens mounted on the polarizing axis, and s is the distance between them.
  • FOV FOV is negatively correlated with f.
  • the combination of f ⁇ f1 that is, the angle of view of the combined lens will be larger than the original
  • the lens angle of view that is, the projection angle of view of the original projection lens is expanded, and the projection area at 2m will be larger than the original 53 inches.
  • the distance between the projection lens and the scanning projection is 10 mm, so when selecting the projection lens, it is necessary to select appropriate parameters so that a lens can be added between the display panel and the projection lens.
  • FIG. 16 is an optical path diagram of a projection device proposed by a specific embodiment of the present application.
  • FIG. 16 is an example of using the above-mentioned projection lens 102, and the scanning lens 1012 is located between the display panel 1011 and the projection lens 102. It can be seen from FIG. 16 that the angle of view when the scanning lens 1012 and the projection lens 102 are installed coaxially is more than off-axis. The viewing angle of the installation is small and the display pixel projection position changes.
  • the projection images of at least two light projectors are collected by the image acquisition unit, and the control unit adjusts the output of each light projector according to the projection images of the at least two light projectors image, so that the image projected by the projection device has high resolution and high brightness.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

La présente invention concerne une machine de projection optique et un procédé de commande associé, et un dispositif de projection. La machine de projection optique comprend un module d'affichage (101) et une lentille de projection (102), la lentille de projection (102) étant disposée sur un côté d'émission de lumière du module d'affichage (101) ; et la machine de projection optique est parallèle à un axe optique (pp') qu'elle ne chevauche pas de la lentille de projection (102) au moyen de la configuration d'un axe central (oo') du module d'affichage (101). Pendant le processus de projection de la machine de projection optique, chaque pixel d'affichage dans le module d'affichage (101) correspond à un trajet de balayage d'affichage sur un écran de projection, chaque trajet de balayage d'affichage correspond à une pluralité de pixels de projection de balayage, et les trajets de balayage d'affichage couvrent des pixels de projection initiaux et des pixels de projection de balayage.
PCT/CN2021/087226 2020-12-31 2021-04-14 Machine de projection optique et procédé de commande associé, et dispositif de projection WO2022141947A1 (fr)

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