CN112817203A - Projection optical machine, control method thereof and projection equipment - Google Patents
Projection optical machine, control method thereof and projection equipment Download PDFInfo
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- 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
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Abstract
本发明公开了一种投影光机及其的控制方法、投影设备，投影光机通过设置显示模块的中心轴与投影镜头的光轴平行且不交叠，使得在投影光机的投影过程中，显示模块中每个显示像素在投影屏幕上对应一显示扫描路径，每个显示扫描路径对应多个扫描投影像素，显示扫描路径覆盖初始投影像素和扫描投影像素；从而，可提高投影图像的分辨率和图像亮度。
The invention discloses a light projector, a control method thereof, and a projection device. By setting the central axis of the display module and the optical axis of the projection lens to be parallel and not overlapping, the light projector can ensure that during the projection process of the light projector, Each display pixel in the display module corresponds to a display scan path on the projection screen, each display scan path corresponds to a plurality of scan projection pixels, and the display scan path covers the initial projection pixels and the scan projection pixels; thus, the resolution of the projected image can be improved and image brightness.
Description
Technical Field
The embodiment of the invention relates to the technical field of projection equipment, in particular to a projection optical machine, a control method of the projection optical machine and projection equipment.
Background
At present, most of projection optical machines utilize DLP (Digital Light Processing) technology or Liquid Crystal projection technology, wherein, DLP technology is a projection technology that the Digital Micromirror Device DMD (Digital Micromirror Device) chip is used as an imaging Device by texas instruments in usa, and a projection image is projected by adjusting reflected Light, the color effect of the DLP projector depends on the color wheel and the DMD chip to move, and the single chip DLP projection system adopts a reflective structure, and particularly in middle and low end products, the single chip DLP projection system is slightly inferior to that of a three primary color mixed LCD (Liquid Crystal Display) projector in the reduction of image color, the color is not vivid enough, and the color gamut is not enough. The basic principle of liquid crystal projection is to use an LCD liquid crystal module to modulate the color light projected from a light source to a screen, and in order to accurately project the color of an image, the color of the light source needs to be separated into R, G, B three colors, and then the colors are combined together and projected on the screen by a projection lens, so that the resolution is low and the brightness is insufficient.
Both the two light sources do not emit light, and the projection is carried out by adopting the other light source illumination mode, namely, the projection light source and the pixelation are divided into two parts, so that much light energy is wasted in the re-patterning process, and the energy utilization rate is low.
The laser scanning projector in the market at present, for example, microvision (laser micro projector), this projector utilizes the fast slow axis scanning projection of intense laser, and color and luminance are all better, but the intense laser scanning can bring the safety problem, scans for a long time and can lead to the high temperature to burn out the projection screen a bit, perhaps can cause the injury to the human eye when people's eye looks straight.
Disclosure of Invention
The invention provides a projection optical machine, a control method thereof and projection equipment, which are used for realizing high-brightness projection image projection in the projection process and cannot cause damage to human eyes when the human eyes look straight.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a projection optical machine, including a display module and a projection lens, where the projection lens is disposed on a light exit side of the display module, and a central axis of the display module is parallel to an optical axis of the projection lens and is not overlapped with the optical axis;
the display module comprises a plurality of display pixels, each display pixel corresponds to an initial projection pixel on a projection screen, the display module performs scanning motion in the projection process of the projection light machine, 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 the scanning projection pixels;
and in the scanning movement process of the display module, the direction of a first display pixel in the display module pointing to a second display pixel is unchanged, and the first display pixel and the second display pixel are any two display pixels in the display module.
According to the projection optical machine provided by the embodiment of the invention, the central axis of the display module is parallel to the optical axis of the projection lens and is not overlapped, so that each display pixel in the display module corresponds to an initial projection pixel on the projection screen, in the projection process of the projection optical machine, 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, and the display scanning path covers the initial projection pixel and the scanning projection pixel. Thus, the resolution of the projected image and the image brightness can be improved.
According to one embodiment of the present invention, the display module includes a display panel; the central axis of the display panel is parallel to the optical axis of the projection lens and is not overlapped;
and in the projection process of the projection light machine, the display panel moves.
According to one embodiment of the present invention, the display module includes a display panel and a scan lens; the optical axis of the scanning lens is parallel to the optical axis of the projection lens and does not overlap;
in the projection process of the projection light machine, the display panel is fixed, and the scanning lens performs scanning motion.
According to one embodiment of the present invention, the scan lens is disposed in an optical path between the display panel and the projection lens;
or, the projection lens includes a plurality of projection lenses, and the scanning lens is disposed in an optical path between any two adjacent projection lenses.
According to one embodiment of the present invention, the scanning lens includes a plurality of sub-scanning lenses arranged in an array.
According to one embodiment of the present invention, the display panel includes a micro light emitting diode display panel, a vertical cavity surface emitting laser display panel, or a quantum dot display panel.
According to an embodiment of the present invention, the scanning motion mode of the display module includes one of a linear scanning motion, a circular scanning motion, an elliptical scanning motion, an 8-shaped scanning motion, or a lissajous figure scanning motion.
In order to achieve the above object, a second aspect of the present invention provides a control method of a projection light engine, applied to the projection light engine, including:
controlling the display state of the display pixels according to the projection requirements; the display state comprises the lighting time and the display brightness of the display pixels;
the display module comprises a plurality of display pixels, each display pixel corresponds to an initial projection pixel on a projection screen, the display module performs scanning movement in the projection process of the projection light machine, 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 pixels and the scanning projection pixels. According to the control method of the projection light machine provided by the embodiment of the invention, the display state of the display pixels is controlled according to the projection requirement, and in the projection process of the projection light machine, each display pixel in the display module corresponds to one 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 pixels and the scanning projection pixels. So that the projected image has high resolution and high brightness.
According to an embodiment of the present invention, in the scanning motion phase of the display module, any point on the display scanning path is filled by the initial projection pixel and/or the scanning projection pixel;
the scanning motion phase of the display module comprises N sub-scanning phases, and the area defined by the display scanning path comprises N display frames; n is not less than 2 and is an integer;
according to the projection requirement, the display state of the display module is controlled to comprise:
in a first sub-scanning stage, controlling a first type of display pixels corresponding to a first display frame to be lightened;
in the ith sub-scanning stage, controlling the lighting of the ith type display pixel corresponding to the ith display frame; i is more than 1 and less than or equal to N, and i is an integer;
and in the Nth sub-scanning stage, controlling the lighting of the Nth type display pixels corresponding to the Nth display frame.
According to an embodiment of the present invention, any point on the display scan path corresponding to each of the display frames is lighted once.
According to one embodiment of the invention, the display pixels comprise a first display pixel and a second display pixel, and each display pixel corresponds to a projection pixel on the projection screen;
in the projection process of the projection light machine, the display module performs 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 covering the initial projection pixel and the scanning projection pixel includes:
in the projection process of the projection light machine, the display module performs scanning motion to control the lighting time of a first display pixel and a second display pixel, the first display pixel corresponds to a first display scanning path on the projection screen, and the first display scanning path is overlapped with a plurality of projection pixels of the second display pixel on the projection screen.
In order to achieve the above object, a third embodiment of the present invention provides a projection apparatus, including at least two of the projection engines; the projection device further includes:
the image acquisition unit is used for acquiring the projection images of at least two projection light machines;
and the control unit is used for adjusting the emergent image of each projection light machine according to the projection images of at least two projection light machines.
According to the projection equipment provided by the embodiment of the invention, the image acquisition unit acquires the projection images of at least two projection light machines, and the control unit adjusts the emergent image of each projection light machine according to the projection images of the at least two projection light machines, so that the image projected by the projection equipment has high resolution and high brightness.
According to one embodiment of the invention, the projection images of at least two of the light projectors are completely overlapped;
the control unit is used for adjusting the synchronous projection display of the at least two projection light machines according to the projection images of the at least two projection light machines.
According to one embodiment of the invention, the projected image edges of at least two of the light projectors are overlapped;
the control unit is used for adjusting at least two projection light machines to be spliced for projection display according to the projection images of the at least two projection light machines.
According to an embodiment of the invention, the image acquisition unit comprises a camera or a camera.
Drawings
Fig. 1 is a schematic structural diagram of a projection light engine according to an embodiment of the present invention;
fig. 2 is a projection image of a projection light machine according to an embodiment of the present invention;
fig. 3 is a projection image of a light engine according to an embodiment of the present invention;
fig. 4 is a projection image of a light engine according to another embodiment of the present invention;
fig. 5 is a projection image of a light engine according to another embodiment of the present invention;
FIG. 6 is a schematic diagram of a light engine according to another embodiment of the present invention;
FIG. 7 is a schematic diagram of a projection light machine according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a light engine according to another embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a projection optical machine according to another embodiment of the present invention;
FIG. 10 is a flowchart of a method for controlling a projector light engine according to an embodiment of the present invention;
fig. 11 is a projection image of a projection optical engine in the control method of the projection optical engine according to the embodiment of the present invention;
fig. 12 is a projection image of a light engine in the control method of the light engine according to an embodiment of the present invention;
fig. 13 is a projection image of a light engine in a control method of the light engine according to another embodiment of the present invention;
fig. 14 is a block diagram of a projection apparatus according to an embodiment of the present invention;
fig. 15 is a projected image of a projection apparatus proposed by an embodiment of the present invention;
fig. 16 is a light path diagram of a projection apparatus according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a projection light engine according to an embodiment of the present invention. As shown in fig. 1, the optical projection engine 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 a central axis oo ' of the display module 101 is parallel to an optical axis pp ' of the projection lens 102 and does not overlap with the optical axis oo ';
the display module 101 comprises a plurality of display pixels, each display pixel corresponds to an initial projection pixel on the projection screen 103, during the projection process of the projection optical machine, the display module 101 performs scanning motion, each display pixel corresponds to a display scanning path on the projection screen 103, 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;
in the process of the scanning movement of the display module 101, the direction in which the first display pixel in the display module 101 points to the second display pixel is not changed, and the first display pixel and the second display pixel are any two display pixels in the display module 101.
It should be noted that 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, where, as shown in fig. 1, the distance between oo 'and pp' is H, and it can be understood that the value of H is greater than 0.
In the prior art, 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, so that after the display pixels are projected by the projection lens 102, the display pixel pitch and the light emitting surface are enlarged in equal proportion, which causes the pixel pitch of the picture to be too large, and the resolution to be reduced. The display module 101 performs a scanning motion such that the display pixels of the display module 101 may 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 pixels and the scanning projection pixels. Therefore, the display scanning path fills the interval between adjacent projection 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 at the central axis oo' in the display module 101 correspond to a display scanning path during the projection process of the projection optical machine, so as to fill up the gap regions between the projection pixels, and thus when the display module 101 performs a scanning motion, each display pixel in the display module 101 can fill up the gap regions between the projection pixels, thereby increasing the resolution and brightness of the projected image.
According to an embodiment of the present invention, the scanning motion mode of the display module 101 includes one of a linear scanning motion, a circular scanning motion, an elliptical scanning motion, an 8-shaped scanning motion, or a lissajous figure scanning motion.
It is understood that during the above-mentioned scanning movement of the display module 101, the display scanning path of each display pixel in the display module 101 on the projection screen 103 forms an image for the movement. For example, as shown in fig. 2, when the scanning motion of the display module 101 is a linear scanning motion (such as a linear fast-slow axis scanning), the display scanning path of each display pixel on the projection screen 103 is, for example, a zigzag. When the scanning motion mode of the display module 101 is circular scanning motion, the display scanning path of each display pixel on the projection screen 103 is circular. It can be known that, when 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. When the scanning motion mode of the display module 101 is 8-word scanning motion, the display scanning path of each display pixel on the projection screen 103 is 8 words. When the scanning motion mode 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 the display pixels in the display module 101 may be, but is not limited to, an m × n array arrangement.
The following description will take as an example that the display pixels in the display module 101 are arranged in an m × n array (where m is 3 and n is 5), and the scanning motion is a circular scanning motion.
In the circular scanning motion process of the display module 101, the direction in which the first display pixel in the display module 101 points to the second display pixel is not changed, and the first display pixel and the second display pixel are any two display pixels in the display module 101.
Fig. 3 is a projection image of a light engine according to an embodiment of the present invention. As shown in fig. 3, the circular scanning radius of the display module 101 is a distance H between the central axis oo 'and the optical axis pp', wherein a direction in which the first display pixel points to the second display pixel in the display module 101 is unchanged. The first projection pixel a in fig. 3 is a first projection pixel a corresponding to the first display pixel when the display module 101 does not perform the scanning motion, that is, an initial projection pixel position corresponding to the first display pixel. The second projection pixel B is a second projection pixel B corresponding to the second display pixel when the display module 101 does not perform the scanning motion, that is, an initial projection pixel position corresponding to the second display pixel. That is, the display module 101 performs a translational circular motion with a radius H around the optical axis pp' of the projection lens. The circle with the radius H of the display scan path of the second display pixel in the display module 101 on the projection screen 103 is curve 2, the display scan path of the third display pixel on the projection screen 103 is curve 1, the display scan path of the fourth display pixel on the projection screen 103 is curve 3, wherein the display scan path of the third display pixel on the projection screen 103 covers a part of the display scan path curve 2 of the second display pixel on the projection screen 103, in other words, the display scan path part curve 2 of the second display pixel on the projection screen 103 fills the region curve 1 defined by the display scan path of the third display pixel on the projection screen 103, thus, the spacing between display pixels in the display module 101 is such that, during the scanning motion of the display module 101, is filled in by the display scanning path of each other display pixel, and further, the resolution of the projected image is improved.
It will be appreciated that the larger the radius H of the display scan path of the display module 101, the more the display scan path of each display pixel is multiplexed. That is, the larger the radius H, the longer the circumference of the display scan path per display pixel, and the longer the arc length of the display scan path through the region other than the initial position of each projection pixel, the greater the contribution to filling the display scan path defining region, that is, the greater the contribution to filling the space region between adjacent pixels. Fig. 4 is a projection image of a projection light engine according to another embodiment of the present invention; fig. 5 is a projection image of a light engine according to another embodiment of the present invention. As shown in fig. 3 to 5, a radius H1 of the display module 101 performing the circular scanning motion in fig. 4 is smaller than a radius H of the display module 101 performing the circular scanning motion in fig. 3, and a radius H2 of the display module 101 performing the circular scanning motion in fig. 5 is larger than the radius H of the display module 101 performing the circular scanning motion in fig. 3. As can be seen from fig. 3 to 5, the 5 th curve and the 4 th curve both contribute to the space between the adjacent projection pixels, but the contribution is small, the 2 nd curve fills the area defined by the 1 st curve, and the 3 rd curve does not fill the area defined by the 1 st curve, and it is obvious that the 2 nd curve and the 1 st curve contribute to the space filling between the adjacent projection pixels more than the 5 th curve and the 4 th curve in fig. 4 contribute to the space filling between the adjacent projection pixels. The 7 th and 8 th curves contribute more to the space filling between adjacent projected pixels than the 2 nd and 1 st curves in fig. 3 do. In other words, the larger the radius H, the greater the gap filling contribution between adjacent projected pixels. The more pixels each display pixel forms on the projection screen, the more contributions to filling the space between adjacent projection pixels, i.e. the more times it is multiplexed.
The following example is still described with respect to circular motion.
Fig. 6 is a schematic structural diagram of a light engine according to another embodiment of the present invention. As shown in fig. 6, 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;
during the projection process of the projector engine, the display panel 1011 moves.
The display panel 1011 includes a micro light emitting diode display panel, a vertical cavity surface emitting laser display panel, or a quantum dot display panel according to an embodiment of the present invention.
It should be noted that 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, the display panel 1011 includes a micro light emitting diode display panel, a vertical cavity surface emitting laser display panel or a quantum dot display panel, the display pixels included in the display panel 1011 have high brightness, in addition, the display panel 1011 makes a circular scanning motion, an imaging track of the display pixels on the display panel 1011 on the projection screen 103 is also a circle, the imaging track can fill the space 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 the eyes are not injured when the eyes are directly viewed.
Taking the micro led display panel 1011 as an example, the resolution of the display panel 1011 is K × K, the resolution of two display panels 1011 is 2K × K, and since the interval between the display pixels at the edge of the display panel and the edge of the display panel may not be completely covered, 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 may depend on the size of the distance between the central axis qq 'of the display panel 1011 and the optical axis pp' of the projection lens 102, the larger the size of the distance between the central axis qq 'of the display panel 1011 and the optical axis pp' of the projection lens 102 is, the larger the covered area of the display pixel at the edge of the display panel from the edge of the display panel is, and the smaller the size of the distance between the central axis qq 'of the display panel 1011 and the optical axis pp' of the projection lens 102 is, the smaller the covered area of the display pixel at the edge of the display panel from the edge of the display panel is, and the larger the value of L is. In addition, the value of N satisfies the relation N ═ pi × D/P, where D is the diameter of the display panel 1011 at which the central axis qq 'makes a circular scanning motion around the optical axis pp' of the projection lens 102, and P is the size of the space between adjacent display pixels.
Specifically, when K is 192, L is 30, and N is 7, the resolution of the projection screen of the final display panel 1101 on the projection screen 103 is 2478 × 1134. Wherein, (384-30) × 7 ═ 2478, (192-30) × 7 ═ 1134. Here, 7 is also the reciprocal of the aperture ratio of the display pixels of the display panel 1011, the size of the display pixels is 22um, the size of the light emitting surface of the display pixels is 3um × 3um, and the aperture ratio of the display pixels is 3/22 ═ 13.6%. Thus, the smaller the aperture ratio of the display pixel, the higher the resolution of the projected image projected onto the projection screen 103, and the better the image quality.
It is understood that fig. 7 is a schematic structural diagram of a projection optical machine according to an embodiment of the present invention. As shown in fig. 7, in the actual installation process, the display panel 1011 may be installed on the gear or the bearing 105, the motor 104 may be used to drive the display panel 1011 fixed on the gear or the bearing 105 to move through a transmission device, and other manners may also be used to drive the display panel 1011 to perform a scanning movement, which is not limited in the present invention. The movement of the display panel 1011 may accelerate the heat dissipation of the display panel 1011.
Fig. 8 is a schematic structural diagram of a light engine according to another embodiment of the present invention. As shown in fig. 8, 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 the optical axis pp' of the projection lens 103;
during the projection process of the projection light machine, the display panel 1011 is fixed, and the scanning lens 1012 moves in a scanning manner.
Note that, in this embodiment, 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 may capture the outgoing light of the display panel 1011 to the maximum extent. The optical axis rr 'of the scanning lens 1012 and the optical axis pp' of the projection lens 102 may 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 may fill the area defined by the display scanning paths of other display pixels on the projection screen 103, thereby improving the resolution brightness of the display image.
Fig. 9 is a schematic structural diagram of a projection optical device according to another embodiment of the present invention. As shown in fig. 9, the scanning lens 1012 is mounted on the hollow rotating shaft 110, the hollow rotating shaft 110 is mounted 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 further drive 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, the display scanning path of the display pixels of the display panel 1011 on the projection screen 103 is a circle, so that the display scanning path of each display pixel on the projection screen 103 can cover the initial projection pixel and the scanning projection pixel, and finally the resolution and the brightness of the projected image are improved.
It can be understood that when the hollow rotating shaft 110 rotates, small blades may be installed on the edge of the hollow rotating shaft 110, and thus the display panel 1011 may dissipate heat during the scanning process of the scanning lens 1012.
According to one embodiment of the present invention, a scan lens 1012 is disposed in the optical path between the display panel 1011 and the projection lens 102;
alternatively, the projection lens 102 includes a plurality of projection lenses, and the scan lens 1012 is disposed in an optical path between any two adjacent projection lenses.
That is, the scan lens 1012 may be provided separately or may be integrated in the projection lens 102.
According to one embodiment of the present invention, the scanning lens 1012 includes a plurality of sub-scanning lenses arranged in an array.
In summary, according to the projection optical machine provided in the embodiment of the present invention, the central axis of the display module is parallel to and does not overlap with the optical axis of the projection lens, so that each display pixel in the display module corresponds to an initial projection pixel on the projection screen, and in the projection process of the projection optical machine, 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, and the display scanning path covers the initial projection pixel and the scanning projection pixel. Thus, the resolution of the projected image and the image brightness can be improved.
Fig. 10 is a flowchart of a method for controlling a projector according to an embodiment of the invention. As shown in fig. 10, the optical projection engine to which the control method of the optical projection engine is applied includes:
s101, controlling the display state of a display pixel according to a projection requirement; the display state includes the lighting time and display brightness of the display pixels;
s102, the display module comprises a plurality of display pixels, each display pixel corresponds to an initial projection pixel on the projection screen, the display module performs scanning movement in the projection process of the projection optical machine, 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 pixels and the scanning projection pixels.
The display module performs scanning motion, and circular motion is still taken as an example for explanation.
The projection requirement refers to a projection picture to be finally displayed on the projection screen by the projector. And controlling the display state of each display pixel in the display module according to the projection picture to be finally presented on the projection screen, wherein the display state comprises the lighting time and the display brightness of the display pixel. Finally, the projection picture to be displayed on the projection screen is pre-stored in the display module in advance.
For example, the projection image to be finally displayed on the projection screen is sequentially triangular and rectangular, that is, after the display pixels in the display module pass through the projection lens, the image finally formed on the projection screen is sequentially triangular and rectangular, so that the display pixels in the display module corresponding to the triangular image are first controlled to be turned on, and then the display pixels in the display module corresponding to the rectangular image are controlled to be turned on.
Fig. 11 is a projection image of a projection optical engine in the control method of the projection optical engine according to the embodiment of the present invention; fig. 12 is a projection image of a light engine in the control method of the light engine according to an embodiment of the present invention. As shown in fig. 11 to 12, the black dots in fig. 11 are imaging points of each display pixel of the display module on the projection screen when the display module does not perform the scanning motion, and in order to improve the resolution of the display image, the display module is controlled to perform the scanning motion, each display pixel corresponds to a display scanning path on the projection screen, and each display scanning path covers an area except the initial projection position. Therefore, in the process of scanning movement of the display module, the interval regions between adjacent pixels, such as the region F and the region G, are passed by the display scanning paths of other display pixels, so that the region F and the region G are lightened, and the resolution and the brightness of a display picture are improved.
The projection requirement may be to specifically illuminate a certain area surrounded by image points on the screen, which are originally formed by the display module without performing scanning motion. The following description will take the projection request as an example to illuminate the region G. It is understood that the area G is lighted up, that is, the area G is completely filled with the display scanning paths of other display pixels, and fig. 12 illustrates only three display scanning paths, that is, a curve 11, a curve 12, and a curve 13, passing through the area G, which is only taken as an example for illustration. In actual operation, the area G can be adjusted according to the distance between the pixels, the radius of the circle of the scanning motion of the display module, and the like, so that the area G is completely filled by the display scanning paths of other display pixels.
It should be noted that, when the projection requirement is only that the region G is lit, the display module only controls the display pixels of the display scanning path entering the region G to be lit during the scanning motion, and controls the display pixels to be turned off after the display scanning path passes through the region G.
How the region G is lit will be described in detail below.
According to one embodiment of the invention, in the scanning motion phase of the display module, any point on the display scanning path is filled by the initial projection pixel and/or the scanning projection pixel;
the scanning motion phase of the display module comprises N sub-scanning phases, and the area limited by the display scanning path comprises N display frames; n is not less than 2 and is an integer;
according to the projection requirement, the display state of the display module is controlled to comprise:
in a first sub-scanning stage, controlling a first type of display pixels corresponding to a first display frame to be lightened;
in the ith sub-scanning stage, controlling the lighting of the ith type display pixel corresponding to the ith display frame; i is more than 1 and less than or equal to N, and i is an integer;
and in the Nth sub-scanning stage, controlling the lighting of the Nth type display pixels corresponding to the Nth display frame.
When the radius of the circular scanning motion of the display module is larger, the display scanning paths passing through the region G are more, and the region G can be lighted up in frames to avoid display flicker. For example, after the display module rotates a preset angle by circular motion scanning, the area G is fully lighted up, the preset angle may be divided into two, three or four angles, that is, the scanning motion phase of the display module is divided into two, three or four sub-scanning phases, and the area G includes N display frames. The following description will be given by taking three sub-scanning stages as an example.
It can be understood that the scanning stage of the display module is divided into three sub-scanning stages, the imaging interval region G is divided into three sub-scanning regions, and in the first sub-scanning stage, the first type of display pixels corresponding to the first display frame are controlled to be lit; in a second sub-scanning stage, controlling a second type of display pixels corresponding to a second display frame to be lightened; and in the third sub-scanning stage, controlling the lighting of a third type of display pixels corresponding to a third display frame.
For example, if the display module moves 120 degrees, the display scan path of the display pixels may completely fill the pixel spacing region G, the positions of the scan coverage points in the pixel spacing region G will be distributed in 0-120 degrees, the coverage points are divided according to the display module movement angle, some points are covered at 0-40 degrees, some points are covered at 41-80 degrees, some points are covered at 81-120 degrees, the number of times of covering in each angle region may be one, two or three, and so on. When a certain point is covered only at 0-40 degrees, the lighting time of the point can only be 0-40 degrees of circular motion of the display module, and when other scanning angles of the certain point except 0-40 degrees are covered (such as 41-80 degrees), a certain angle area can be selected to be lighted according to the information amount of two frames. When a point is covered by all three angular regions, one angular region may be randomly selected. Therefore, all points in the imaging interval area G can be divided into three frames according to angles, and when the three frames are actually displayed, the information displayed by the three frames is a frame, so that the frame display is realized, and the flicker is prevented.
It should be noted that 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. When the motor rotates for a first angle, the first type of display pixels corresponding to a first display frame of the display module are controlled to be lightened, when the motor rotates for a second angle, the second type of display pixels corresponding to a second display frame of the display module are controlled to be lightened, and when the motor rotates for a third angle, the third type of display pixels corresponding to a third display frame of the display module are controlled to be lightened. The rotation speed of the motor is 20 circles/S, a complete display frame can be displayed by rotating the display module by 120 degrees, a picture display frame rate of 60 frames/S can be displayed, and a picture display frame rate of 180 frames/S can be displayed by dividing a complete display frame of 120 degrees into 40 degrees.
According to one embodiment of the present invention, any point on the display scan path corresponding to each display frame is lit once.
It can be understood that, in the process of the scanning movement of the display module, the imaging interval region G is divided into three sub-scanning regions, and in the first sub-scanning stage, the first type of display pixels corresponding to the first display frame are controlled to be lit; in a second sub-scanning stage, controlling a second type of display pixels corresponding to a second display frame to be lightened; and in the third sub-scanning stage, controlling the lighting of a third type of display pixels corresponding to a third display frame. When the first type display pixels corresponding to the first display frame are lighted, and when the second type display pixels corresponding to the second display frame are lighted, the lighting positions of the first type display pixels and the lighting positions of the second type display pixels are overlapped. In the case of the 11 th curve, the 12 th curve and the 13 th curve in fig. 11, in the first sub-scanning stage, the 11 th curve passes through the region G first, then the 13 th curve passes through the region G, and finally the 12 th curve passes through the region G. When the 11 th curve passes through the region G, the point a in the figure is lit, and when the 13 th curve passes through the region G, the point a in the figure is also lit. When the curve 11 passes through the region G, the point b in the figure is lighted up, when the curve 12 passes through the region G, the point b in the figure is also lighted up, and other points are also lighted up twice, which is not listed here. In this way, the luminance of the point a and the luminance of the point b, and the luminance of other repetitive lighting are brighter than the luminance of the points at other positions in the region G, and the display luminance is not uniform.
Thus, in order to ensure uniform brightness of the dots at the respective positions in the area G, only the dots at the respective dot positions in the control area G are lighted once. Also by way of example in fig. 11, the positions of the other points in the area G are lit 1 time, and therefore, the points a and b and other repeatedly lit points should be lit 1 time each, that is, when the curve 11 is lit at the point a, the curve 13 is extinguished when passing the point a, the curve 11 is lit at the point b, the curve 12 is extinguished when passing the point b, and conversely, when the curve 11 is extinguished when passing the point a, the curve 13 is lit at the point a, the curve 11 is extinguished when passing the point b, and the curve 12 is lit at the point b. Thereby ensuring that the display brightness of each point in the area G is uniform.
According to one embodiment of the invention, the display pixels comprise a first display pixel and a second display pixel, and each display pixel corresponds to a projection pixel on the projection screen;
in the projection process of the projection light machine, the display module performs scanning movement, 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 pixels and the scanning projection pixels, including:
in the projection process of the projection light machine, the display module performs scanning movement to control the lighting time of the first display pixels and the second display pixels, the first display pixels correspond to a first display scanning path on the projection screen, and the first display scanning path is overlapped with the projection pixels of the plurality of second display pixels on the projection screen.
It should be noted that fig. 13 is a projection image of the optical projection engine in the control method of the optical projection engine according to another embodiment of the present invention. As shown in fig. 13, the display pixels include a first display pixel and a plurality of second display pixels, wherein the first display pixel is a 1 st display pixel, the plurality of second display pixels are 2 nd to 8 th display pixels, and projection pixels of the 2 nd to 8 th display pixels on the projection screen overlap with a corresponding first display scanning path of the 1 st display pixel on the projection screen, in other words, projection pixels of the 2 nd to 8 th display pixels on the projection screen are all on the corresponding first display scanning path of the 1 st display pixel on the projection screen.
That is, during the scanning motion of the display module, the display pixels corresponding to the other 7 projection pixels on the display path of the 1 st display pixel are simultaneously turned on. Therefore, the refresh frequency of the display module can be reduced under the same brightness, and the power consumption of the display module can be reduced while the projection resolution and the brightness are kept unchanged.
In summary, according to the control method of the projection optical engine provided in the embodiment of the present invention, the display state of the display pixels is controlled according to the projection requirement, and in the projection process of the projection optical engine, each display pixel in the display module corresponds to one 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 the scanning projection pixel, so that the projection image has high resolution and high brightness.
Fig. 14 is a block diagram of a projection apparatus according to an embodiment of the present invention. As shown in fig. 14, the projection apparatus includes at least two light projectors; the projection device further comprises:
the image acquisition unit 113 is used for acquiring projection images of at least two projection light machines;
and the control unit 114 is configured to adjust an emergent image of each light projector according to the projection images of the at least two light projectors.
In the following, two optical projectors are taken as an example for description, that is, the projection apparatus includes a first optical projector 111, a second optical 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 emergent images of the first light projector 111 and the second light projector 112 according to the images acquired by the image acquisition unit 113.
According to one embodiment of the invention, the image acquisition unit 113 comprises a camera or a camera.
The brightness and resolution of the projection light machine are very important parameters, and the resolution can be very high because the scanning imaging projection is adopted in the invention. Because the brightness of the MicroLED chip is as high as ten million nits, the brightness of a picture projected on a screen meets the requirement of normal viewing, when the picture needs to be displayed on a bright occasion, the projection brightness can be increased by overlapping display of a plurality of projection optical machines, and when two or more chips are overlapped in scanning imaging, the lighting state and the motor rotation state of pixels of a display panel are controlled, so that electrodeless multiplication or projection area multiplication of the projection brightness can be realized under the condition of no loss of resolution, and ultrahigh-brightness projection is realized.
The following describes the overlapping display of multiple projection engines to increase the projection brightness and the overlapping display of multiple projection engines to increase the projection area.
According to one embodiment of the invention, the projected images of at least two light projectors are completely overlapped;
the control unit 114 is configured to adjust the at least two optical projectors to perform synchronous projection display according to the projection images of the at least two optical projectors.
Taking two projection light machines as an example, the first projection image emitted by the first projection light machine 111 completely overlaps with the second projection image emitted by the second projection light machine 112, the image acquisition unit 113 captures the first projection image and the second projection image, and when the first projection image and the second projection image do not completely overlap, the control unit 114 readjusts the first projection image emitted by the first projection light machine 111 and the second projection image emitted by the second projection light machine 112 according to a difference between the first projection image and the second projection image. It can be known that the second projection image emitted by the second projector engine 112 may be adjusted only by using the first projection image as a reference, or the first projection image emitted by the first projector engine 111 may be adjusted by using the second projection image as a reference, or the first projection image emitted by the first projector engine 111 and the second projection image emitted by the second projector engine 112 may be adjusted simultaneously by using a virtual reference, so that the first projection image and the second projection image are completely overlapped, thereby increasing the brightness of the projection images.
When a plurality of projection optical machines are used for superposition display, a signal synchronization control mechanism needs to be established among the plurality of projection optical machines, so that the scanning motion states of the plurality of projection optical machines keep a fixed phase difference, and frames of the plurality of projection optical machines can be synchronized, therefore, a correction time needs to be set for each frame during display, if a frame can be projected by rotating the motor by 115 degrees, a time for rotating the motor by 120 degrees can be set for the frame, and a redundant time for rotating the motor by 5 degrees is reserved for correcting the motor rotation state and/or correcting the display state of display pixels. In order to ensure the synchronous display quality of multiple projection optical machines, the image acquisition unit 113 may be set to detect the projection quality and perform signal feedback during multiple synchronous projections, when the image acquisition unit 113 detects that a deviation occurs in the rotation or playing state of a certain projection optical machine, a signal is transmitted to the control unit 114 in time, and the control unit 114 adjusts the emergent image of the projection optical machine according to the received signal. In the invention, the scanning projection enables the projector to have ultra-high resolution, which is the basis for carrying out superposition display, and the ultra-high display resolution can ensure that the pixels of different projectors can be correspondingly superposed when in superposition. The image acquisition unit 113 can also provide a projection correction signal to the control unit 114 to nonlinearly correct the projection image plane according to the display condition of the projection surface.
According to one embodiment of the invention, the projected image edges of at least two light projectors overlap;
the control unit 114 is configured to adjust the at least two optical projectors to perform a tiled projection display according to the projection images of the at least two optical projectors.
Fig. 15 is a projection image of a projection apparatus according to an embodiment of the present invention. As shown in fig. 15, the scheme of increasing the projection area by splicing and displaying multiple projectors is that the projection display splicing and projection fusion technologies are very mature at present, but most of these technologies are realized by overlapping the projection areas, and the resolution of the projection optical machines is lost to a certain extent, the present invention realizes splicing without losing the resolution of the projection optical machines, and is realized by overlapping the originally incompletely scanned areas at the edges in the scanning scheme, taking four projectors as an example, the projection areas of the four projectors have partially overlapped areas during projection, which are the spliced areas 116 shown in the following figure, which areas 116 are the edge areas of the projection optical machines, according to the aforementioned scanning and displaying principle, the incompletely scanned areas at the edges of a single projector may have incompletely scanned areas, the incompletely scanned areas of adjacent projectors overlap each other to form overlapped areas, and the scanned overlapped areas form spliced areas to form complete coverage, finally, the spliced display is realized under the condition that the scanning edge area of the projector is not wasted. Thus, the projection display area is increased.
According to an embodiment of the present invention, the data shown in table 1 is data of a projection lens of a projection optics, the equivalent focal length is 21mm to 23.1mm, the projection size at 2m is 53 inches, and the distance between the display panel and the projection optics is about 21.2 mm. A scanning lens is added in front of the projection lens, when the scanning lens is installed, the optical axis of the scanning lens is at a certain distance from the optical axis of the projection lens, namely the polarizing axis of the scanning lens is installed, taking the focal length of the lens as 30mm as an example, the lens is calculated according to a lens combination equivalent focal length calculation formula
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 the two.
When f1 is 21mm, f2 is 30mm, and s is 10mm, the f combination can be calculated to be 15.36mm, and the formula is calculated according to the viewing angle of the projection light engine
Wherein k is diagonal of the display panel, f is focal length of the projection lens, FOV is display view angle, and when k is not changed, FOV and f are inversely related, the invention f combination<f1, the angle of view of the combined lens is larger than that of the original lens, i.e. the projection angle of view of the original projection lens is enlarged, and the projected area at 2m is larger than the original 53 inches. In the invention, the distance between the projection lens and the scanning projection is 10mm, so that when the projection lens is selected, proper parameters need to be selected, and a lens can be added between the display panel and the projection lens.
TABLE 1 projection lens data of projection engine
| Zoom ratio | 1.1:1 |
| Aperture range | F＝2.56-2.8 |
| Actual focal length | f＝21-23.1mm |
| Throw ratio | 1.86-2.04 |
| Size of projection | 40-300 inches |
| Screen ratio | 4:3 |
| Number of colors | 10.7 hundred million colors |
| Trapezoidal correction | And (2) vertically: plus or minus 40 degrees |
| Computer compatibility | 480i，480p，576i，567p，720p，1080i，1080p |
Fig. 16 is a light path diagram of a projection apparatus according to an embodiment of the present invention. Fig. 16 is an example using the projection lens 102 described above, and a scanning lens 1012 is positioned between the display panel 1011 and the projection lens 102, and it can be seen from fig. 16 that the angle of view at which the scanning lens 1012 is mounted coaxially with the projection lens 102 is smaller than the angle of view at which it is mounted off-axis and the projection position of the display pixel is changed.
In summary, according to the projection apparatus provided in the embodiment of the present invention, the image acquisition unit acquires the projection images of the at least two projection light machines, and the control unit adjusts the emergent image of each projection light machine according to the projection images of the at least two projection light machines, so that the image projected by the projection apparatus has high resolution and high brightness.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (15)
1. A projection optical machine is characterized by comprising a display module and a projection lens, wherein the projection lens is arranged on the light emergent side of the display module, and the central axis of the display module is parallel to the optical axis of the projection lens and is not overlapped;
the display module comprises a plurality of display pixels, each display pixel corresponds to an initial projection pixel on a projection screen, the display module performs scanning motion in the projection process of the projection light machine, 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 the scanning projection pixels; and in the scanning movement process of the display module, the direction of a first display pixel in the display module pointing to a second display pixel is unchanged, and the first display pixel and the second display pixel are any two display pixels in the display module.
2. The light engine of claim 1, wherein the display module comprises a display panel; the central axis of the display panel is parallel to the optical axis of the projection lens and is not overlapped;
and in the projection process of the projection light machine, the display panel moves.
3. The light engine of claim 1, wherein the display module comprises a display panel and a scan lens; the optical axis of the scanning lens is parallel to the optical axis of the projection lens and does not overlap;
in the projection process of the projection light machine, the display panel is fixed, and the scanning lens performs scanning motion.
4. The light-engine of claim 3, wherein the scan lens is disposed in an optical path between the display panel and the projection lens;
or, the projection lens includes a plurality of projection lenses, and the scanning lens is disposed in an optical path between any two adjacent projection lenses.
5. The light-engine of claim 3, wherein the scan lens comprises a plurality of sub-scan lenses, and the plurality of sub-scan lenses are arranged in an array.
6. The light-projector machine of claim 2 or 3, wherein the display panel comprises a micro light-emitting diode display panel, a vertical cavity surface emitting laser display panel, or a quantum dot display panel.
7. The light engine of claim 1, wherein the scanning motion of the display module comprises one of a linear scanning motion, a circular scanning motion, an elliptical scanning motion, a figure-8 scanning motion, or a lissajous figure scanning motion.
8. A control method of a projection optical engine, applied to the projection optical engine of any one of claims 1 to 7, comprising:
controlling the display state of the display pixels according to the projection requirements; the display state comprises the lighting time and the display brightness of the display pixels;
the display module comprises a plurality of display pixels, each display pixel corresponds to an initial projection pixel on a projection screen, the display module performs scanning movement in the projection process of the projection light machine, 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 pixels and the scanning projection pixels.
9. The control method according to claim 8, wherein, in the scanning motion phase of the display module, any point on the display scanning path is filled by the initial projection pixel and/or the scanning projection pixel;
the scanning motion phase of the display module comprises N sub-scanning phases, and the area defined by the display scanning path comprises N display frames; n is not less than 2 and is an integer;
according to the projection requirement, the display state of the display module is controlled to comprise:
in a first sub-scanning stage, controlling a first type of display pixels corresponding to a first display frame to be lightened;
in the ith sub-scanning stage, controlling the lighting of the ith type display pixel corresponding to the ith display frame; i is more than 1 and less than or equal to N, and i is an integer;
and in the Nth sub-scanning stage, controlling the lighting of the Nth type display pixels corresponding to the Nth display frame.
10. The control method according to claim 9, wherein any point on the display scan path corresponding to each of the display frames is lighted once.
11. The control method according to claim 8, wherein the display pixels include a first display pixel and a second display pixel, each of the display pixels corresponding to a projection pixel on the projection screen;
in the projection process of the projection light machine, the display module performs scanning motion, each display pixel corresponds to a display scanning path on the projection screen, and each display scanning path covers an area except the initial projection position, including:
in the projection process of the projection light machine, the display module performs scanning motion to control the lighting time of a first display pixel and a second display pixel, the first display pixel corresponds to a first display scanning path on the projection screen, and the first display scanning path is overlapped with a plurality of projection pixels of the second display pixel on the projection screen.
12. A projection device comprising at least two light projectors as claimed in any one of claims 1 to 7, the projection device further comprising:
the image acquisition unit is used for acquiring the projection images of at least two projection light machines;
and the control unit is used for adjusting the emergent image of each projection light machine according to the projection images of at least two projection light machines.
13. The projection device of claim 12, wherein the projected images of at least two of the light projectors completely overlap;
the control unit is used for adjusting the synchronous projection display of the at least two projection light machines according to the projection images of the at least two projection light machines.
14. The projection device of claim 12, wherein projected image edges of at least two of the light projectors overlap;
the control unit is used for adjusting at least two projection light machines to be spliced for projection display according to the projection images of the at least two projection light machines.
15. The projection device of claim 12, wherein the image acquisition unit comprises a camera or a still camera.
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