CN115236850B - Method for controlling vibrating mirror to achieve 2-time and 4-time pixel lifting and projector - Google Patents

Method for controlling vibrating mirror to achieve 2-time and 4-time pixel lifting and projector Download PDF

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Publication number
CN115236850B
CN115236850B CN202110444334.8A CN202110444334A CN115236850B CN 115236850 B CN115236850 B CN 115236850B CN 202110444334 A CN202110444334 A CN 202110444334A CN 115236850 B CN115236850 B CN 115236850B
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force
optical lens
axis
driving device
shake
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CN115236850A (en
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江滔
尹蕾
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Chengdu Jimi Technology Co Ltd
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Chengdu Jimi Technology Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
    • G02B26/0833—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H04N9/312—Driving therefor

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Adjustment Of Camera Lenses (AREA)

Abstract

The invention discloses a method for controlling a vibrating mirror to realize 2 times and 4 times pixel lifting and a projector, wherein when the 4 times pixel is lifted, a driving device drives an optical lens to alternately shake along two mutually perpendicular axes, and the directions of adjacent two times shake along the same axis are opposite; when the pixel point is lifted by 2 times, the driving device drives the optical lens to shake by taking the angular bisectors of two mutually perpendicular axes as axes, and the directions of adjacent shake are opposite. The optical lens control method with the steps can realize the change of 2 dithering modes through different dithering modes on the basis of the same hardware, thereby achieving the purpose of respectively improving the pixel points by 2 times and 4 times, increasing the scale income and reducing the cost.

Description

Method for controlling vibrating mirror to achieve 2-time and 4-time pixel lifting and projector
Technical Field
The invention relates to a method for controlling a vibrating mirror of a projector to lift 2 times and 4 times of pixel points and the projector adopting the method to control the vibrating mirror.
Background
In the projector technology field, a technique of multiplying a pixel point by an optical lens action is what we refer to as "shake". For example, "1080P jittering 4K" and "1080P jittering 2K" are respectively increasing the resolution of the image from 1920×1080 to 3840×2160 and from 1920×1080 to 2560×1440. The method is characterized in that a plurality of low-resolution images are respectively projected in unit time to cause illusion of high resolution by utilizing the visual residue phenomenon of human eyes, and the illusion is not improvement of physical pixel points. But the realization is cheaper than the increase of the cost of physical pixel points, and is a common technology in the projector industry.
The existing optical lens technology can only adjust the resolution by a single multiple, such as only shake 4K from 1080P or shake 2K from 1080P. In order to distinguish product lines, manufacturers have to independently open the dies for the optical lenses with two specifications, so that the production cost is increased.
Disclosure of Invention
In view of this, the present invention provides a method and a projector for controlling a galvanometer to achieve 2-fold and 4-fold pixel lifting, which can achieve 2-fold and 4-fold pixel lifting on the basis of the same hardware.
In order to solve the technical problems, the technical scheme of the invention is as follows: a method for controlling a vibrating mirror to realize 2 times and 4 times of pixel lifting is disclosed, when the 4 times of pixel lifting is realized, a driving device drives an optical lens to alternately shake along two mutually perpendicular axes, and the directions of adjacent two times of shake along the same axis are opposite; when the pixel point is lifted by 2 times, the driving device drives the optical lens to shake by taking the angular bisectors of two mutually perpendicular axes as axes, and the directions of adjacent shake are opposite.
As an improvement, the two mutually perpendicular axes are an X axis and a Y axis, and the angular bisector of the X axis and the Y axis is a 45-degree axis; when the pixel point is lifted by 4 times, the driving device alternately applies force vertical to the plane where the optical lens is positioned on the side edges of the X axis and the Y axis to promote the optical lens to shake alternately along the two axes; and the directions of the forces which promote the shaking of the optical lens along the same axis are opposite. When the pixel point is lifted by 2 times, the driving device simultaneously applies force vertical to the plane where the optical lens is positioned on the side edges of the X axis and the Y axis to promote the optical lens to shake along the 45-degree axis; and the directions of forces urging the shaking of the optical lens twice are opposite.
As an improvement, the optical lens is rectangular, and the X axis and the Y axis are two perpendicular central axes of the optical lens respectively.
Preferably, the force applied by the driving device comprises four forces of force F1, force F2, force F3 and force F4, wherein the force F1 and the force F2 are respectively arranged on two sides of the X axis, and the force F3 and the force F4 are respectively arranged on two sides of the Y axis; and force F1 and force F3 are on the same side of the 45 DEG axis and force F2 and force F4 are on the other side of the 45 DEG axis;
if the pixel point is increased by 4 times, the optical lens alternately shakes along the X axis and the Y axis under the promotion of the force F1 and the force F2, the force F3 and the force F4; force F1 and force F2 are applied simultaneously and in opposite directions when the optical lens is caused to shake along the X axis; when the optical lens is driven to shake along the X axis next time, the directions of the force F1 and the force F2 are opposite to the previous time, so that the shake directions of the optical lens are opposite; force F3 and force F4 are applied simultaneously and in opposite directions when the optical lens is caused to shake along the Y axis; when the optical lens is driven to shake along the Y axis next time, the directions of the force F3 and the force F4 are opposite to the previous time, so that the shake directions of the optical lens are opposite;
if the pixel point is increased by 2 times, the optical lens shakes along the 45-degree axis under the resultant force of four forces of force F1, force F2, force F3 and force F4; force F1, force F2, force F3, force F4 are applied simultaneously; force F1 is in the same direction as force F3, force F2 is in the same direction as force F4, and force F1 and force F3 are in opposite directions to force F2 and force F4; and the directions of the four forces F1, F2, F3 and F4 are opposite to the last time when the optical lens shakes next time, so that the shaking direction of the optical lens is opposite.
Preferably, the four forces F1, F2, F3 and F4 are applied by four driving devices I, II, III and IV disposed on four sides of the optical lens, respectively, the driving device I applies force F1, the driving device III applies force F3, and the driving device IV applies force F4; the driving device I and the driving device II are arranged on the long side of the optical lens, and the driving device III and the driving device IV are arranged on the short side of the optical lens.
Preferably, the force F1 and the force F2 are the same, and the force F3 and the force F4 are the same; and force F1 and force F2 are greater than force F3 and force F4. When the optical lens is rectangular, the amplitude of the optical lens in the left-right direction is made the same as the amplitude of the optical lens in the up-down direction according to the principle of leverage.
Preferably, the force applied by the driving device comprises a force F1 on the X-axis side and a force F3 on the Y-axis side; and force F1 and force F3 are on the same side of the 45 DEG axis;
if the pixel point is increased by 4 times, the optical lens alternately shakes along the X axis and the Y axis under the promotion of the force F1 and the force F3; force F1 is applied when the optical lens is driven to shake along the X axis; when the optical lens is driven to shake along the X axis next time, the direction of the force F1 is opposite to the previous time, so that the shake direction of the optical lens is opposite; force F3 is applied when the optical lens is driven to shake along the Y axis; when the optical lens is driven to shake along the Y axis next time, the direction of the force F3 is opposite to the previous time, so that the shake direction of the optical lens is opposite;
if the pixel point is increased by 2 times, the optical lens shakes along the 45-degree axis under the resultant force of the force F1 and the force F3; force F1 and force F3 are applied simultaneously and in the same direction; and the direction of the force F1 and the force F3 at the next shake is opposite to the last time, so that the shake direction of the optical lens is opposite.
Preferably, the force F1 and the force F3 are applied by the driving device I and the driving device III, respectively, the driving device I applies the force F1 and the driving device III applies the force F3; the driving device I is arranged on the long side of the optical lens, and the driving device III is arranged on the short side of the optical lens.
Preferably, the force F1 is greater than the force F3. When the optical lens is rectangular, the amplitude of the optical lens in the left-right direction is made the same as the amplitude of the optical lens in the up-down direction according to the principle of leverage.
As an improvement, a screen shift is detected; selecting a corresponding driving device according to the offset direction; the amount of force applied by the drive device is adjusted according to the amount of deflection. The force applied by the driving device is adjusted to adjust the amplitude, namely the deflection angle, of the optical lens, so that the device is suitable for various types of equipment.
The invention also provides a projector, which comprises a vibrating mirror, wherein the vibrating mirror is controlled by the method, so that the lifting of 2 times and 4 times of pixel points is realized.
The invention has the advantages that: the optical lens control method with the steps can realize the change of 2 dithering modes through different dithering modes on the basis of the same hardware, thereby achieving the purpose of respectively improving the pixel points by 2 times and 4 times, increasing the scale income and reducing the cost.
Drawings
FIG. 1 is a first galvanometer embodying the invention.
Fig. 2 is a second galvanometer embodying the invention.
Fig. 3 is a schematic diagram of the present invention using 4 driving devices.
Fig. 4 is a schematic diagram of the present invention using 2 driving devices.
Fig. 5 to 16 are schematic diagrams of lifting 4-fold pixels.
Fig. 5 is a schematic diagram of the jitter directions of the optical lens at time I when 4 driving apparatuses are used.
Fig. 6 is a schematic view of an image projected at time I.
Fig. 7 is a schematic diagram of the jitter direction of the optical lens at time II when 4 driving apparatuses are used.
Fig. 8 is a schematic view of an image projected at time II.
Fig. 9 is a schematic diagram of the jitter direction of the optical lens at time III when 4 driving apparatuses are used.
Fig. 10 is a schematic view of an image projected at time III.
Fig. 11 is a schematic diagram of the shake direction of the optical lens at time IV when 4 driving apparatuses are used.
Fig. 12 is a schematic view of an image projected at time IV.
Fig. 13 is a schematic diagram of the shake direction of the optical lens at time I when 2 driving apparatuses are used.
Fig. 14 is a schematic diagram of the jitter direction of the optical lens at time II when 2 driving apparatuses are used.
Fig. 15 is a schematic diagram of the jitter direction of the optical lens at time III when 2 driving apparatuses are used.
Fig. 16 is a schematic diagram of the shake direction of the optical lens at time IV when 2 driving apparatuses are used.
Fig. 17 to 21 are schematic diagrams of lifting 2-fold pixels.
Fig. 17 is a schematic diagram of the shake direction of the optical lens at time I when 4 driving apparatuses are used.
Fig. 18 is a schematic diagram of the shake direction of the optical lens at time II when 4 driving apparatuses are used.
Fig. 19 is an image illustration of a 2-pixel lift projection.
Fig. 20 is a schematic diagram of the jitter direction of the optical lens at time I when 2 driving apparatuses are used.
Fig. 21 is a schematic diagram of the shake direction of the optical lens at time II when 2 driving apparatuses are used.
The marks in the figure: 1 optical lens, 2 inner frame, 3 middle frame, 4 outer frame, 5 connection point I, 6 connection point II, 7 drive device I, 8 drive device II, 9 drive device III, 10 drive device IV.
Detailed Description
In order to make the technical scheme of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the following specific embodiments.
The implementation of the invention requires a certain hardware foundation, namely the vibrating mirror comprises an optical lens and a driving device for driving the optical lens to shake, wherein the optical lens can shake alternately along two mutually perpendicular axes under the driving of the driving device, and can shake along the resultant force direction of the two axes. The "shake" in the present invention refers to the overturn of the optical lens at a certain angle along a certain axis.
In the present invention, two types of galvanometer hardware are listed that can implement the present invention.
The first type is shown in fig. 1, and comprises a moving part, wherein the moving part comprises an inner frame 2, a middle frame 3 and an outer frame 4, light holes are formed in the inner frame 2, and the optical lenses 1 are fixed in the light holes; the inner frame 2 is connected with the middle frame 3 by a connecting point I5; the middle frame 3 is connected with the outer frame 4 by a connection point II 6. The optical lens 1 is rectangular, the inner frame 2, the middle frame 3 and the outer frame 4 are square frames, the connecting points I5 are two arranged between the inner frame 2 and the middle frame 3, and the two connecting points I5 are respectively arranged on opposite sides of the inner frame 2; the two connection points II6 are arranged between the middle frame 3 and the outer frame 4, and the two connection points II6 are respectively arranged on opposite sides of the middle frame 3; the optical lens 1 can shake with the connection line of the two connection points I5 or the connection line of the two connection points II6 as an axis under the driving of a driving device (not shown in this embodiment), and can shake with the connection line of the two connection points I5 and the connection line of the two connection points II6 as an axis at the same time. It should be noted that, the above-mentioned simultaneous shake taking two lines as axis shake is actually taking the resultant force direction of the two lines as axis shake.
The optical lens 1 is preferably rectangular, and the two connection points I5 and the two connection points II6 are respectively located on two mutually perpendicular central axes of the optical lens 1. That is, the optical lens 1 may shake along two central axes perpendicular to each other, or may shake along a resultant force direction (preferably, an angular bisector) of the two central axes.
The second, as shown in fig. 2, comprises moving parts comprising an outer frame (not shown in this embodiment) and an inner frame 2; the inner frame 2 is provided with a light hole for installing the optical lens 1, and the optical lens 1 is fixed in the light hole; the inner frame 2 is connected with the outer frame by using connection points I5 symmetrically arranged on two sides of the inner frame 2 and connection points II6 symmetrically arranged on the other two sides of the inner frame 2; the connection point I5 and the connection point II are respectively 4 or even more than 4; the optical lens 1 can be dithered with the vertical bisector of the same-side connection point I5 or the vertical bisector of the same-side connection point II6 as an axis, respectively, and can be dithered with the vertical bisector of the same-side connection point I5 and the vertical bisector of the same-side connection point II6 as an axis, respectively, under the drive of a driving device (not shown). It should be noted that, the above-mentioned simultaneous shake with two connecting lines as axes is actually shake with the resultant force direction of two perpendicular bisectors as axes. In the present invention, "on the same side" means on the same side as the axis of the optical lens 1, and "on both sides" means on both sides of the axis of the optical lens 1.
The optical lens 1 is preferably rectangular, and the perpendicular bisector of the connection line of the same side connection point I5 and the perpendicular bisector of the connection line of the same side connection point II6 are respectively overlapped with two perpendicular bisectors of the optical lens. In practice, the optical lens 1 may shake along two central axes perpendicular to each other, or may shake along a resultant force direction (preferably, an angular bisector) of the two central axes.
The two galvanometer types described above are merely used to illustrate to a person skilled in the art how to design a galvanometer to practice the invention and are not intended to limit the specific embodiments of the invention. In practice, the invention can be implemented as long as the optical lens 1 is driven by the driving device to oscillate alternately along two mutually perpendicular axes, and also along the resultant force of the two axes.
In addition, the driving device of the invention has a specific structure composed of a coil and a permanent magnet. The direction and the size of the current of the coil in each driving device can be controlled independently, and the amplitude and the direction of the shake of the optical lens 1 can be controlled through the size and the direction of the current of the coil, so that the control is more convenient. By the force analysis and the force synthesis, it can be determined that the optical lens 1 rotates around a certain angle at a certain time, and the magnitude of the amplitude and the center of a certain axis are determined. Therefore, the image and the light path can be adjusted in a targeted manner so as to adapt to various types of equipment.
When the pixel point needs to be lifted by 4 times, the driving device drives the optical lens 1 to shake alternately along two mutually perpendicular axes, and the directions of shake along the same axis are opposite in two adjacent times. The two mutually perpendicular axes are an X axis and a Y axis. Because the optical lens is preferably rectangular, the X axis and the Y axis are respectively two perpendicular central axes of the optical lens. The angular bisectors of the X axis and the Y axis are 45 degrees. When the pixel point is lifted by 4 times, the driving device alternately applies force vertical to the plane where the optical lens 1 is positioned on the side edges of the X axis and the Y axis to promote the optical lens 1 to shake alternately along the two axes; and the directions of forces urging the optical lens 1 to shake along the same axis are opposite in two adjacent times.
As shown in fig. 3, in embodiment 1, the driving method of 4 driving devices is adopted to raise the pixel point by 4 times. The force applied by the driving device comprises four forces, namely force F1, force F2, force F3 and force F4, wherein the force F1 and the force F2 are respectively arranged on two sides of the X axis, and the force F3 and the force F4 are respectively arranged on two sides of the Y axis; and force F1 and force F3 are on the same side of the 45 DEG axis and force F2 and force F4 are on the other side of the 45 DEG axis; the four forces of the force F1, the force F2, the force F3 and the force F4 are respectively exerted by a driving device I7, a driving device II8, a driving device III9 and a driving device IV10 which are arranged on four sides of the optical lens, the driving device I7 exerts a force F1, the driving device II8 exerts a force F2, the driving device III9 exerts a force F3 and the driving device IV10 exerts a force F4; the method comprises the steps of carrying out a first treatment on the surface of the The driving means I7 and the driving means II8 are arranged on the long side of the optical lens 1 and the driving means III9 and the driving means IV10 are arranged on the short side of the optical lens 1. Preferably, the force F1 and the force F2 are the same in magnitude, and the force F3 and the force F4 are the same in magnitude; and force F1 and force F2 are greater than force F3 and force F4. The principle is that force F1 and force F2 should be greater than force F3 and force F4 in order to synthesize a resultant force direction of 45 ° according to the lever principle, due to the short moments of force F1 and force F2.
The magnitudes of the forces F1 to F4 are all based on the case where the optical lens 1 is rectangular. When the optical lens 1 is square or circular, the forces F1 to F4 are preferably equal. In fact, the final purpose of the device is to adjust the amplitude, i.e. the angle of deflection, of the optical lens 1, whether it is an adjusting force or an adjusting moment. Therefore, the specific adjusting means is not limited as long as the amplitude of the optical lens can meet the requirement.
The optical lens 1 alternately shakes along the X axis and the Y axis under the promotion of the force F1 and the force F2 and the force F3 and the force F4; force F1 and force F2 are applied simultaneously and in opposite directions when the optical lens 1 is caused to shake along the X axis; and the next time the optical lens 1 is caused to shake along the X-axis, the directions of the force F1 and the force F2 are opposite to the last time, so that the shake direction of the optical lens 1 is opposite; force F3 and force F4 are applied simultaneously and in opposite directions when the optical lens 1 is caused to shake along the Y axis; and the next time the optical lens 1 is caused to shake along the Y-axis, the directions of the force F3 and the force F4 are reversed from the last time, so that the shake direction of the optical lens 1 is reversed.
According to the principle of dithering and lifting the pixel points, the optical lens 1 needs to project four different low-resolution images to four directions respectively, and the illusion that the pixel points are lifted by 4 times is obtained through the human eye vision residual phenomenon. The method comprises the following specific steps:
as shown in fig. 5, at time I, the coil III and the coil IV of the driving device III9 and the driving device IV10 are controlled while passing currents of equal magnitude and opposite directions. So that the driving device III9 generates a force F3 perpendicular to the paper surface and from the inside to the outside of the paper surface, and the driving device IV10 generates a force F4 perpendicular to the paper surface and from the outside to the inside of the paper surface, so that the left half part of the optical lens 1 is turned inwards along the Y axis and the right half part is turned outwards along the Y axis. The projected image is shown in fig. 6.
As shown in fig. 7, at time II, the coils I and II of the driving devices I7 and II8 are controlled while passing currents of equal magnitude and opposite directions. So that the driving device I7 generates a force F1 perpendicular to the paper surface and from the inside to the outside of the paper surface, and the driving device II8 generates a force F2 perpendicular to the paper surface and from the outside to the inside of the paper surface, so that the upper half part of the optical lens 1 is turned outwards along the X axis, and the lower half part is turned inwards along the X axis. The projected image is shown in fig. 8.
As shown in fig. 9, at time III, coil III and coil IV of drive device III9 and drive device IV10 are controlled while passing equal and opposite currents. And the direction of the current is again opposite to instant I. So that the driving device III9 generates a force F3 perpendicular to the paper surface and from outside to inside, and the driving device IV10 generates a force F4 perpendicular to the paper surface and from inside to outside, so that the left half part of the optical lens 1 is turned outwards along the Y axis and the right half part is turned inwards along the Y axis. The projected image is shown in fig. 10.
As shown in fig. 11, at time IV, the coils I and II of the driving devices I6 and II7 are controlled to pass currents of equal magnitude and opposite directions. And the direction of the current is again opposite to time II. So that the driving device I6 generates a force F1 perpendicular to the paper surface and from outside to inside the paper surface, and the driving device II7 generates a force F2 perpendicular to the paper surface and from inside to outside the paper surface, so that the upper half part of the optical lens 1 is turned inwards along the X axis, and the lower half part is turned outwards along the X axis. The projected image is shown in fig. 12.
The steps are circulated to generate the lifting of 4 times of pixel points.
As shown in fig. 4, embodiment 2 is to use 2 driving means to raise the pixel by 4 times. The force applied by the driving device comprises a force F1 positioned on the side of the X axis and a force F3 positioned on the side of the Y axis; and force F1 and force F3 are on the same side of the 45 DEG axis; the force F1 and the force F3 are applied by a driving device I7 and a driving device III9, the driving device I7 applies the force F1, and the driving device III applies the force F3; the driving means I7 are arranged on the long side of the optical lens 1 and the driving means III9 are arranged on the short side of the optical lens 1. Preferably, the force F1 is greater than the force F3. The principle is that the force F1 should be greater than the force F3 in order to synthesize a resultant force direction of 45 ° according to the lever principle, due to the short moment of the force F1.
The magnitudes of the forces F1 and F3 are based on the case where the optical lens 1 is rectangular. When the optical lens 1 is square or circular, the forces F1 and F3 are preferably equal. In fact, the final purpose of the device is to adjust the amplitude, i.e. the angle of deflection, of the optical lens 1, whether it is an adjusting force or an adjusting moment. Therefore, the specific adjusting means is not limited as long as the amplitude of the optical lens can meet the requirement.
The optical lens 1 alternately shakes along the X axis and the Y axis under the promotion of the force F1 and the force F3; force F1 is applied when the optical lens 1 is caused to shake along the X axis; and the next time the optical lens is caused to shake along the X-axis, the direction of the force F1 is opposite to that of the last time, so that the shake direction of the optical lens 1 is opposite; force F3 is applied when the optical lens 1 is caused to shake along the Y axis; and the next time the optical lens 1 is caused to shake along the Y-axis, the direction of the force F3 is reversed from that of the last time, so that the shake direction of the optical lens 1 is reversed.
According to the principle of dithering and lifting the pixel points, the optical lens needs to project four different low-resolution images to four directions respectively, and the false image of improving the pixel points by 4 times is obtained through the human eye vision residual phenomenon. The method comprises the following specific steps:
as shown in fig. 13, at time I, the driving device III9 is controlled such that the driving device III9 generates a force F3 perpendicular to the paper surface and from the inside of the paper surface to the outside of the paper surface, causing the left half of the optical lens 1 to be turned in along the Y axis and the right half to be turned out along the Y axis. The projected image is shown in fig. 6.
As shown in fig. 14, at time II, the driving device I7 is controlled such that the driving device I7 generates a force F1 perpendicular to the paper surface and from the inside of the paper surface to the outside of the paper surface, causing the upper half of the optical lens 1 to evert along the X axis and the lower half to evert along the X axis. The projected image is shown.
As shown in fig. 15, at time III, the driving device III9 is controlled to pass a current having the same magnitude as that at time I and opposite directions. So that the driving device III9 generates a force F3 perpendicular to the paper surface and from outside to inside the paper surface, and the left half part of the optical lens 1 is caused to be turned outwards along the Y axis, and the right half part is caused to be turned inwards along the Y axis. The projected image is shown in fig. 10.
As shown in fig. 16, at time IV, the driving device I7 is controlled to pass a current having the same magnitude and opposite direction as that at time II. So that the driving device I7 generates a force F1 perpendicular to the paper surface and from outside to inside the paper surface, and the upper half part of the optical lens is caused to be turned inwards along the X axis, and the lower half part of the optical lens is caused to be turned outwards along the X axis. The projected image is shown in fig. 12.
The steps are circulated to generate the lifting of 4 times of pixel points.
When the pixel point needs to be lifted by 2 times, the driving device drives the optical lens 1 to shake by taking the angular bisectors of two mutually perpendicular axes as axes, and the directions of adjacent shake are opposite. The two mutually perpendicular axes are an X axis and a Y axis. Since the optical lens 1 is preferably rectangular, the X-axis and the Y-axis are two perpendicular central axes of the optical lens 1, respectively. The angular bisectors of the X axis and the Y axis are 45 degrees. When the pixel point is lifted by 2 times, the driving device simultaneously applies force vertical to the plane where the optical lens 1 is positioned on the side edges of the X axis and the Y axis to promote the optical lens to shake along the 45-degree axis; and the directions of forces urging the shaking of the optical lens twice are opposite.
Embodiment 3 is a driving method using 4 driving devices to raise the pixel point by 2 times. The force applied by the driving device comprises four forces, namely force F1, force F2, force F3 and force F4, wherein the force F1 and the force F2 are respectively arranged on two sides of the X axis, and the force F3 and the force F4 are respectively arranged on two sides of the Y axis; and force F1 and force F3 are on the same side of the 45 DEG axis and force F2 and force F4 are on the other side of the 45 DEG axis; the four forces of the force F1, the force F2, the force F3 and the force F4 are respectively exerted by a driving device I7, a driving device II8, a driving device III9 and a driving device IV10 which are arranged on four sides of the optical lens 1; the driving means I7 and the driving means II8 are arranged on the long side of the optical lens 1 and the driving means III9 and the driving means IV10 are arranged on the short side of the optical lens 1. The force F1 and the force F2 are the same in size, and the force F3 and the force F4 are the same in size; and force F1 and force F2 are greater than force F3 and force F4. The principle is that force F1 and force F2 should be greater than force F3 and force F4 in order to synthesize a resultant force direction of 45 ° according to the lever principle, due to the short moments of force F1 and force F2.
The optical lens 1 shakes along a 45-degree axis under the resultant force of four forces of force F1, force F2, force F3 and force F4; force F1, force F2, force F3, force F4 are applied simultaneously; force F1 is in the same direction as force F3, force F2 is in the same direction as force F4, and force F1 and force F3 are in opposite directions to force F2 and force F4; and the directions of the four forces F1, F2, F3 and F4 are opposite to the previous one when the optical lens 1 shakes next time, so that the shake direction of the optical lens 1 is opposite.
According to the principle of dithering and lifting the pixel points, the optical lens 1 needs to project two pairs of different low-resolution images to two directions respectively, and the false image of improving the pixel points by 2 times is obtained through the human eye vision residual phenomenon. The method comprises the following specific steps:
as shown in fig. 17, at time I, driving device I7 and driving device III9 are controlled to apply force F1 and force F3 perpendicular to the paper surface and from the inside of the paper surface to the outside of the paper surface; the control of the driving means II8 and the driving means IV10 applies a force F2 and a force F4 perpendicular to the paper surface and from outside the paper surface into the paper surface, causing the upper left part of the optical lens 1 to evert and the lower right part to evert along its resultant force direction, i.e. the 45 ° axis.
As shown in fig. 18, at time II, driving device I7 and driving device III9 are controlled to apply force F1 and force F3 perpendicular to the paper surface and from outside to inside the paper surface; the control drive II8 and drive IV10 apply forces F2 and F4 perpendicular to the paper surface and from the inside of the paper to the outside of the paper surface, causing the upper left portion of the optical lens 1 to be turned inside out and the lower right portion to be turned outside in the direction of the resultant force thereof, i.e., the 45 ° axis.
The above steps are cycled through, and the optical lens 1 projects an image as shown in fig. 19, resulting in a 2-pixel lift.
Embodiment 4 is a driving method using 2 driving devices to raise the pixel point by 2 times. The force applied by the driving device comprises a force F1 positioned on the side of the X axis and a force F3 positioned on the side of the Y axis; and force F1 and force F3 are on the same side of the 45 DEG axis; the force F1 and the force F3 are applied 9 by the drive I7 and the drive III, respectively; the driving means I7 are arranged on the long side of the optical lens 1 and the driving means III9 are arranged on the short side of the optical lens 1. The force F1 is greater than the force F3. The principle is that the force F1 should be greater than the force F3 in order to synthesize a resultant force direction of 45 ° according to the lever principle, due to the short moment of the force F1.
The optical lens 1 shakes along the 45-degree axis under the resultant force of the force F1 and the force F3; force F1 and force F3 are applied simultaneously and in the same direction; and the directions of the force F1 and the force F3 at the next shake are opposite to those at the last time, so that the shake direction of the optical lens 1 is opposite.
According to the principle of dithering and lifting the pixel points, the optical lens 1 needs to project two pairs of different low-resolution images to two directions respectively, and the false image of improving the pixel points by 2 times is obtained through the human eye vision residual phenomenon. The method comprises the following specific steps:
as shown in fig. 20, at time I, the driving device I7 and the driving device III9 are controlled to apply a force F1 and a force F3 perpendicular to the paper surface and from the inside of the paper surface to the outside of the paper surface, causing the upper left portion of the optical lens 1 to be turned out and the lower right portion to be turned in along the resultant force direction thereof, that is, the 45 ° axis.
As shown in the figure, at time II, the driving means I7 and the driving means III9 are controlled to apply forces F1 and F3 perpendicular to the paper surface and from outside to inside the paper surface, causing the upper left part of the optical lens 1 to be turned in its resultant force direction, i.e., 45 ° axis, and the lower right part to be turned out.
The above steps are cycled through, as shown in the figure, producing a 2-fold pixel lifting.
It should be noted that the above-mentioned arrangements of 2 and 4 driving devices are only for showing the person skilled in the art how to drive the optical lens to shake to implement the present invention, and are not limited to the specific embodiments of the present invention. In practice, the invention can be implemented as long as the optical lens 1 is driven by the driving device to oscillate alternately along two mutually perpendicular axes, and also along the resultant force of the two axes.
To ensure that the optical lens 1 can shake along the angular bisectors of the X-axis and the Y-axis, i.e., the 45 ° axis, it can be confirmed by the simulation test platform whether the resultant force of F1 and F3 with F2 and F4, or the resultant force of F1 and F3 can cause the optical lens to shake along the 45 ° axis. If a deviation occurs, the magnitude of the force can be changed by increasing or decreasing the current to the coil.
In addition, the invention also provides a projector, which comprises a vibrating mirror, wherein the vibrating mirror is controlled by the method, so that the lifting of 2 times and 4 times of pixel points is realized.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that the above-mentioned preferred embodiment should not be construed as limiting the invention, and the scope of the invention should be defined by the appended claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.

Claims (7)

1. A method for controlling a vibrating mirror to achieve 2 times and 4 times pixel lifting is characterized by comprising the following steps of:
when the pixel point is lifted by 4 times, the driving device drives the optical lens to shake alternately along two mutually perpendicular axes, and the directions of shake along the same axis are opposite for two adjacent times;
when the pixel point is lifted by 2 times, the driving device drives the optical lens to shake by taking the angular bisectors of two mutually perpendicular axes as axes, and the directions of adjacent shake are opposite; wherein,
the two mutually perpendicular axes are an X axis and a Y axis, and the angular bisectors of the X axis and the Y axis are 45-degree axes;
the optical lens is rectangular, and the X axis and the Y axis are two perpendicular central axes of the optical lens respectively;
the driving device comprises coils and permanent magnets, and the direction and the magnitude of coil current in any driving device can be independently controlled; wherein,
the force applied by the driving device comprises four forces, namely force F1, force F2, force F3 and force F4, wherein the force F1 and the force F2 are respectively arranged on two sides of the X axis, and the force F3 and the force F4 are respectively arranged on two sides of the Y axis; and force F1 and force F3 are on the same side of the 45 DEG axis and force F2 and force F4 are on the other side of the 45 DEG axis;
if the pixel point is increased by 4 times, the optical lens alternately shakes along the X axis and the Y axis under the promotion of the force F1 and the force F2 and the force F3 and the force F4;
force F1 and force F2 are applied simultaneously and in opposite directions when the optical lens is caused to shake along the X axis; when the optical lens is driven to shake along the X axis next time, the directions of the force F1 and the force F2 are opposite to the previous time, so that the shake directions of the optical lens are opposite;
force F3 and force F4 are applied simultaneously and in opposite directions when the optical lens is caused to shake along the Y axis; when the optical lens is driven to shake along the Y axis next time, the directions of the force F3 and the force F4 are opposite to the previous time, so that the shake directions of the optical lens are opposite;
if the pixel point is increased by 2 times, the optical lens shakes along the 45-degree axis under the resultant force of four forces of force F1, force F2, force F3 and force F4; force F1, force F2, force F3, force F4 are applied simultaneously; force F1 is in the same direction as force F3, force F2 is in the same direction as force F4, and force F1 and force F3 are in opposite directions to force F2 and force F4; the directions of the force F1, the force F2, the force F3 and the force F4 are opposite to the previous direction when the optical lens shakes for the next time, so that the shaking direction of the optical lens is opposite; wherein,
the four forces of the force F1, the force F2, the force F3 and the force F4 are respectively applied by four driving devices I, II, III and IV arranged on four sides of the optical lens, the driving device I applies a force F1, the driving device II applies a force F2, the driving device III applies a force F3 and the driving device IV applies a force F4; the driving device I and the driving device II are arranged on the long side of the optical lens, and the driving device III and the driving device IV are arranged on the short side of the optical lens.
2. The method for controlling the galvanometer to achieve 2-time and 4-time pixel lifting according to claim 1, wherein the method comprises the following steps of:
when the pixel point is lifted by 4 times, the driving device alternately applies force vertical to the plane where the optical lens is positioned on the side edges of the X axis and the Y axis to promote the optical lens to shake alternately along the two axes; and the directions of the adjacent two times of shaking force of the optical lens along the same axis are opposite;
when the pixel point is lifted by 2 times, the driving device simultaneously applies force vertical to the plane where the optical lens is positioned on the side edges of the X axis and the Y axis to promote the optical lens to shake along the 45-degree axis; and the directions of forces urging the shaking of the optical lens twice are opposite.
3. The method for controlling the galvanometer to achieve 2-time and 4-time pixel lifting according to claim 2, wherein the method comprises the following steps of: the force F1 and the force F2 are the same in size, and the force F3 and the force F4 are the same in size; and force F1 and force F2 are greater than force F3 and force F4.
4. The method for controlling the galvanometer to achieve 2-time and 4-time pixel lifting according to claim 2, wherein the method comprises the following steps of: the force applied by the driving device comprises a force F1 positioned on the side of the X axis and a force F3 positioned on the side of the Y axis; and force F1 and force F3 are on the same side of the 45 DEG axis;
if the pixel point is increased by 4 times, the optical lens alternately shakes along the X axis and the Y axis under the promotion of the force F1 and the force F3;
force F1 is applied when the optical lens is driven to shake along the X axis; when the optical lens is driven to shake along the X axis next time, the direction of the force F1 is opposite to the previous time, so that the shake direction of the optical lens is opposite;
force F3 is applied when the optical lens is driven to shake along the Y axis; when the optical lens is driven to shake along the Y axis next time, the direction of the force F3 is opposite to the previous time, so that the shake direction of the optical lens is opposite;
if the pixel point is increased by 2 times, the optical lens shakes along the 45-degree axis under the resultant force of the force F1 and the force F3; force F1 and force F3 are applied simultaneously and in the same direction; and the direction of the force F1 and the force F3 at the next shake is opposite to the last time, so that the shake direction of the optical lens is opposite.
5. The method for controlling the galvanometer to achieve 2-time and 4-time pixel lifting according to claim 4, wherein the method comprises the following steps of: the force F1 and the force F3 are respectively applied by a driving device I and a driving device III, wherein the driving device I applies the force F1, and the driving device III applies the force F3; the driving device I is arranged on the long side of the optical lens, and the driving device III is arranged on the short side of the optical lens.
6. The method for controlling the galvanometer to achieve 2-time and 4-time pixel lifting according to claim 5, wherein the method comprises the following steps of: the force F1 is greater than the force F3.
7. A projector, comprising a vibrating mirror, characterized in that: the galvanometer is controlled by the method of any one of claims 1 to 6.
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