CN115236850A - Method for controlling galvanometer to achieve 2-time and 4-time pixel point lifting and projector - Google Patents

Method for controlling galvanometer to achieve 2-time and 4-time pixel point lifting and projector Download PDF

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Publication number
CN115236850A
CN115236850A CN202110444334.8A CN202110444334A CN115236850A CN 115236850 A CN115236850 A CN 115236850A CN 202110444334 A CN202110444334 A CN 202110444334A CN 115236850 A CN115236850 A CN 115236850A
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force
optical lens
axis
driving device
shake
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CN115236850B (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 galvanometer to realize pixel point lifting by 2 times and 4 times and a projector, wherein when the pixel point lifting by 4 times is realized, a driving device drives an optical lens to shake alternately along two mutually vertical axes, and the directions of two adjacent times of shaking along the same axis are opposite; when the 2-time pixel point is improved, the driving device drives the optical lens to shake by taking the angular bisector of the two mutually perpendicular axes as the axis, and the directions of the shake of the two adjacent times are opposite. The optical lens control method with the steps can realize the change of 2 shaking forms through different shaking modes on the basis of the same hardware, thereby achieving the purpose of respectively improving 2 times and 4 times of pixel points, increasing the large-scale income and reducing the cost.

Description

Method for controlling galvanometer to realize pixel point lifting by 2 times and 4 times and projector
Technical Field
The invention relates to a method for controlling a galvanometer of a projector to realize pixel point lifting by 2 times and 4 times and the projector adopting the method to control the galvanometer.
Background
In the field of projector technology, the technique of multiplying pixels by the action of optical lenses is known as "dithering". Such as "1080P dither 4K", "1080P dither 2K" are for increasing the image resolution from 1920 x 1080 to 3840 x 2160 and from 1920 x 1080 to 2560 x 1440, respectively. The core of the method is that a plurality of low-resolution images are respectively projected in unit time, and the phenomenon of human eye vision residue is utilized to cause the illusion of high resolution, but not the physical improvement of pixel points. But the realization cost is lower than that of increasing physical pixel points, so that the method is a common technology in the projector industry at present.
The prior optical lens technology can adjust the resolution by a single multiple, such as only 4K dithering from 1080P or only 2K dithering from 1080P. In order to distinguish product lines, manufacturers have to separately open the molds for the optical lenses with two specifications, so that the production cost is increased.
Disclosure of Invention
In view of this, the invention provides a method and a projector for controlling a galvanometer to achieve 2-fold and 4-fold pixel point lifting, and the lifting of the 2-fold and 4-fold pixel points can be achieved 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 galvanometer to realize pixel point lifting by 2 times and 4 times is characterized in that when the pixel point lifting by 4 times is realized, a driving device drives an optical lens to shake alternately along two mutually vertical axes, and the directions of two adjacent times of shaking along the same axis are opposite; when the 2-time pixel point is improved, the driving device drives the optical lens to shake by taking the angular bisector of the two mutually perpendicular axes as the axis, and the directions of the shake of the two adjacent times are opposite.
As a modification, the two mutually perpendicular axes are an X axis and a Y axis, and an angular bisector of the X axis and the Y axis is a 45 ° axis; when the pixel points are increased by 4 times, the driving device alternately applies force perpendicular to the plane of the optical lens on the side edges of the X axis and the Y axis to enable the optical lens to shake alternately along the two axes; and the directions of the forces for causing the optical lens to shake along the same axis at two adjacent times are opposite. When the 2-time pixel points are improved, the driving device applies force perpendicular to the plane of the optical lens on the X-axis and the Y-axis at the same time to enable the optical lens to shake along the 45-degree axis; and the directions of the forces causing the optical lens to shake in two adjacent times 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, namely a force F1, a force F2, a force F3 and a 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; the force F1 and the force F3 are positioned on the same side of the 45-degree axis, and the force F2 and the force F4 are positioned on the other side of the 45-degree 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 urging of the force F1, the force F2, the force F3 and the force F4; when the optical lens is caused to shake along the X axis, the force F1 and the force F2 are applied simultaneously and in opposite directions; when the optical lens is caused 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 shaking direction of the optical lens is opposite; when the optical lens is promoted to shake along the Y axis, the force F3 and the force F4 are applied simultaneously and in opposite directions; and the next time the optical lens is caused to shake along the Y-axis, the directions of the force F3 and the force F4 are 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, the force F2, the force F3 and the force F4; force F1, force F2, force F3 and force F4 are exerted simultaneously; forces F1 and F3 are in the same direction, force F2 and F4 are in the same direction, and forces F1 and F3 are in the opposite direction to forces F2 and F4; and the directions of the four forces of the force F1, the force F2, the force F3 and the force F4 are opposite to the previous time when the optical lens is shaken 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 respectively, disposed on four sides of the optical lens, wherein the driving device I applies the force F1, the driving device III applies the force F3 and the driving device IV applies the force F4; the driving device I and the driving device II are arranged on the long edge of the optical lens, and the driving device III and the driving device IV are arranged on the short edge of the optical lens.
Preferably, the force F1 and the force F2 have the same magnitude, and the force F3 and the force F4 have the same magnitude; and forces F1 and F2 are greater than forces F3 and F4. When the optical lens is rectangular, the amplitude of the optical lens in the left-right direction is the same as the amplitude of the optical lens in the up-down direction according to the lever principle.
Preferably, the force applied by the driving device includes a force F1 at the X-axis side and a force F3 at the Y-axis side; and the force F1 and the force F3 are located on the same side of the 45-degree axis;
if the pixel point is increased by 4 times, the optical lens is driven by the force F1 and the force F3 to shake alternately along the X axis and the Y axis; applying a force F1 when the optical lens is caused to shake along the X axis; when the optical lens is caused to shake along the X axis next time, the direction of the force F1 is opposite to that of the last time, so that the shaking direction of the optical lens is opposite; applying a force F3 when the optical lens is caused to shake along the Y axis; and when the optical lens is caused to shake along the Y axis next time, the direction of the force F3 is opposite to the last time, so that the shaking 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; the force F1 and the force F3 are applied simultaneously and in the same direction; and the direction of the force F1 and the force F3 at the time of the next shake is opposite to the previous one so that the shake direction of the optical lens is opposite.
Preferably, the force F1 and the force F3 are applied by a driving device I and a driving device III, respectively, the driving device I applies the force F1, and the driving device III applies the force F3; the drive means I are arranged on the long side of the optical lens and the drive means III are 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 the same as the amplitude of the optical lens in the up-down direction according to the lever principle.
As an improvement, a picture shift is detected; selecting a corresponding driving device according to the offset direction; the magnitude of the force applied by the drive means is adjusted in accordance with the offset. The device is used for adjusting the amplitude of the optical lens, namely the deflection angle, by adjusting the force applied by the driving device, thereby being suitable for various types of equipment.
The invention also provides a projector which comprises a galvanometer, wherein the galvanometer is controlled by the method, so that the improvement 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 shaking forms through different shaking modes on the basis of the same hardware, thereby achieving the purpose of respectively improving 2 times and 4 times of pixel points, increasing the large-scale income and reducing the cost.
Drawings
Fig. 1 shows a first galvanometer in which the present invention may be implemented.
Fig. 2 is a second galvanometer that may implement the present 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 the pixel lifting by 4 times.
Fig. 5 is a schematic diagram of the shake direction of the optical lens at time I when 4 driving devices are used.
Fig. 6 is a schematic view of the projected image at time I.
Fig. 7 is a schematic diagram of the shake direction of the optical lens at time II when 4 driving devices are used.
Fig. 8 is a schematic view of the projected image at time II.
Fig. 9 is a schematic diagram showing the wobbling direction of the optical lens at time III when 4 driving devices are used.
Fig. 10 is a schematic view of the projected image at time III.
Fig. 11 is a schematic diagram of the shake direction of the optical lens at time IV when 4 driving devices are used.
Fig. 12 is a schematic view of the projected image at time IV.
Fig. 13 is a schematic diagram of the shake direction of the optical lens at time I when 2 driving devices are used.
Fig. 14 is a schematic diagram of the shake direction of the optical lens at time II when 2 driving devices are used.
Fig. 15 is a schematic diagram showing the wobbling direction of the optical lens at time III when 2 driving devices are used.
Fig. 16 is a schematic diagram showing the shake direction of the optical lens at time IV when 2 driving devices are used.
Fig. 17 to 21 are schematic diagrams of the pixel lifting by 2 times.
Fig. 17 is a schematic diagram of the shake direction of the optical lens at time I when 4 driving devices are used.
Fig. 18 is a schematic diagram of the shake direction of the optical lens at time II when 4 driving devices are used.
Fig. 19 is an illustration of an image projected at 2 x pixel lift.
Fig. 20 is a schematic diagram of the shake direction of the optical lens at time I when 2 driving devices are used.
Fig. 21 is a schematic diagram of the shake direction of the optical lens at time II when 2 driving devices are used.
The labels in the figure are: 1 optical lens, 2 inner frame, 3 middle frame, 4 outer frame, 5 connection point I, 6 connection point II, 7 driving device I, 8 driving device II, 9 driving device III, 10 driving device IV.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments in order to make those skilled in the art better understand the technical solutions of the present invention.
The implementation of the present invention requires a certain hardware basis, that is, the galvanometer includes an optical lens and a driving device for driving the optical lens to shake, and the optical lens can shake alternately along two mutually perpendicular axes under the driving of the driving device, and also can shake along the direction of the resultant force of the two axes. The term "shake" as used herein refers to the turning of an optical lens along an axis at a certain angle.
In the present invention, two kinds of galvanometer hardware capable of implementing the present invention are listed.
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, a light hole is formed in the inner frame 2, and the optical lens 1 is fixed in the light hole; 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 connecting 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 two connection points I5 are arranged between the inner frame 2 and the middle frame 3, and the two connection 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 respectively shake by taking a connecting line of two connecting points I5 or a connecting line of two connecting points II6 as an axis under the driving of a driving device (not shown in the embodiment), and also can shake by taking a connecting line of two connecting points I5 and a connecting line of two connecting points II6 as an axis at the same time. It should be noted that the simultaneous shaking about two connecting lines as an axis actually involves shaking about a resultant direction of the two connecting lines as an axis.
The optical lens 1 is preferably rectangular, and the two connection points I5 and the two connection points II6 are located on two mutually perpendicular central axes of the optical lens 1. That is, the optical lens 1 can shake along two mutually perpendicular central axes, or shake along the resultant direction (preferably, angular bisector) of the two central axes as an axis.
The second type, as shown in fig. 2, comprises a moving member including an outer frame (not shown in the present embodiment) and an inner frame 2; the inner frame 2 is provided with a light hole for mounting 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 utilizing connecting points I5 symmetrically arranged at two sides of the inner frame 2 and connecting points II6 symmetrically arranged at the other two sides of the inner frame 2; the number of the connecting points I5 and the number of the connecting points II are respectively 4 or more than 4; the optical lens 1 can shake by taking a perpendicular bisector of the same-side connection point I5 or a perpendicular bisector of the same-side connection point II6 as an axis, and also can shake by taking a perpendicular bisector of the same-side connection point I5 and a perpendicular bisector of the same-side connection point II6 as an axis, respectively, under the driving of a driving device (not shown). It should be noted that the simultaneous dithering using the two connecting lines as the axis actually uses the resultant direction of the two perpendicular bisectors as the axis dithering. In the present invention, "on the same side" means on the same side of 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 a perpendicular bisector of a connecting line of the same-side connecting point I5 and a perpendicular bisector of a connecting line of the same-side connecting point II6 are respectively superposed with the two mutually perpendicular bisectors of the optical lens. In fact, the optical lens 1 can also shake along two central axes perpendicular to each other, or shake along the resultant direction (preferably, angular bisector) of the two central axes as an axis.
The two galvanometers described above are only used to show the skilled person how to design the galvanometers to implement the present invention, and are not used to limit the specific embodiments of the present invention. In fact, the present invention can be implemented as long as the optical lens 1 can be driven by the driving device to alternately shake along two mutually perpendicular axes, and can also shake along the direction of the resultant force of the two axes.
In addition, the specific structure of the driving device in the invention is composed of a coil and a permanent magnet. The direction and the size of the coil current led into 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 led into the coil, so that the control is more convenient. Through the force analysis and the force synthesis, the optical lens 1 can be judged to rotate around a certain angle at a certain moment, and the size of the amplitude and the center of a certain axis can be judged. Therefore, the image and the light path can be adjusted in a targeted manner to adapt to various models of equipment.
When the pixel point of 4 times needs to be improved, the driving device drives the optical lens 1 to shake alternately along two mutually perpendicular axes, and the directions of two adjacent times of shaking along the same axis are opposite. 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 two perpendicular central axes of the optical lens respectively. And the angular bisector of the X axis and the Y axis is a 45-degree axis. When the pixel points are increased by 4 times, the driving device alternately applies force perpendicular to the plane of the optical lens 1 on the side edges of the X axis and the Y axis to enable the optical lens 1 to shake alternately along two axes; and the directions of the forces which cause the optical lens 1 to shake along the same axis at two adjacent times are opposite.
As shown in fig. 3, in embodiment 1, a driving method using 4 driving devices improves the pixel point by 4 times. The force applied by the driving device comprises four forces, namely a force F1, a force F2, a force F3 and a force F4, wherein the force F1 and the force F2 are respectively arranged on two sides of an X axis, and the force F3 and the force F4 are respectively arranged on two sides of a Y axis; the force F1 and the force F3 are positioned on the same side of the 45-degree axis, and the force F2 and the force F4 are positioned on the other side of the 45-degree 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 the force F1, the driving device II8 exerts the force F2, the driving device III9 exerts the force F3, and the driving device IV10 exerts the force F4; (ii) a The drive means I7 and II8 are arranged on the long side of the optical lens 1 and the drive means III9 and IV10 are arranged on the short side of the optical lens 1. Preferably, the force F1 and the force F2 have the same magnitude, and the force F3 and the force F4 have the same magnitude; and forces F1 and F2 are greater than forces F3 and F4. The principle is that since the moments of the forces F1 and F2 are short, the forces F1 and F2 should be larger than the forces F3 and F4 according to the lever principle in order to combine a resultant force direction of 45 °.
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 adjustment force or the adjustment torque is to adjust the amplitude, i.e. the deflection angle, of the optical lens 1. Therefore, any means can be used as long as the amplitude of the optical lens can meet the requirement, and the specific adjusting means is not limited in the invention.
The optical lens 1 is alternately dithered along the X-axis and the Y-axis under the urging of the forces F1 and F2 and the forces F3 and F4; when the optical lens 1 is caused to shake along the X axis, the force F1 and the force F2 are applied simultaneously and in opposite directions; 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 previous time, so that the shake direction of the optical lens 1 is opposite; when the optical lens 1 is caused to shake along the Y axis, the force F3 and the force F4 are applied simultaneously and in opposite directions; 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 opposite to the previous time, so that the shake direction of the optical lens 1 is opposite.
According to the principle of improving the pixel points by dithering, the optical lens 1 needs to project four different low-resolution images to four directions respectively, and the false image that the pixel points are improved by 4 times is obtained through the phenomenon of human vision residue. The method comprises the following specific steps:
as shown in fig. 5, at time I, the coils III and IV of the driving devices III9 and IV10 are controlled while passing currents of equal magnitude and opposite directions. So that the driving device III9 generates a force F3 which is perpendicular to the paper surface and is from the paper surface to the paper surface, and the driving device IV10 generates a force F4 which is perpendicular to the paper surface and is from the paper surface to 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 of the optical lens is turned outwards along the Y axis. The projected image is shown in fig. 6.
As shown in fig. 7, at time II, coils I and II of 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 which is vertical to the paper surface and is from the paper surface to the paper surface, and the driving device II8 generates a force F2 which is vertical to the paper surface and is from the paper surface to the paper surface, so that the upper half part of the optical lens 1 is outwards turned along the X axis, and the lower half part of the optical lens 1 is inwards turned along the X axis. The projected image is shown in fig. 8.
As shown in fig. 9, at time III, the coils III and IV of the driving devices III and IV 9 and IV10 are controlled while passing currents of equal magnitude and opposite directions. And the direction of the current is again opposite to the instant I. So that the driving device III9 generates a force F3 perpendicular to the paper surface and from the paper surface to the paper surface, and the driving device IV10 generates a force F4 perpendicular to the paper surface and from the paper surface to the paper surface, so that the left half part of the optical lens 1 is outwards turned along the Y axis, and the right half part of the optical lens 1 is inwards turned along the Y axis. The projected image is shown in fig. 10.
As shown in fig. 11, at time IV, coils I and II of driving devices I6 and II7 are controlled while passing currents of equal and opposite directions. And the direction of the current is again opposite to instant II. So that the driving device I6 generates a force F1 which is vertical to the paper surface and is out of the paper surface, and the driving device II7 generates a force F2 which is vertical to the paper surface and is out of 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 of the optical lens is turned outwards along the X axis. The projected image is shown in fig. 12.
The steps are circulated to generate 4 times of pixel point promotion.
As shown in fig. 4, in embodiment 2, a driving method using 2 driving devices improves the pixel point by 4 times. The force applied by the driving device comprises a force F1 at the X-axis side and a force F3 at the Y-axis side respectively; and the force F1 and the force F3 are positioned on the same side of the 45-degree axis; the force F1 and the force F3 are exerted by a driving device I7 and a driving device III9, the driving device I7 exerts the force F1, and the driving device III exerts the force F3; the drive I7 is arranged on the long side of the optical lens 1 and the drive III9 is arranged on the short side of the optical lens 1. Preferably, said force F1 is greater than the force F3. The principle is that since the moment of the force F1 is short, the force F1 should be larger than the force F3 according to the lever principle in order to synthesize a resultant force direction of 45 °.
The magnitudes of the forces F1 and F3 are based on the optical lens 1 being 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 adjustment force or the adjustment moment is to adjust the amplitude of the optical lens 1, i.e. the deflection angle. Therefore, any means can be used as long as the amplitude of the optical lens can meet the requirement, and the invention is not limited by the specific adjusting means.
The optical lens 1 is alternately shaken along the X axis and the Y axis under the urging of the force F1 and the force F3; when the optical lens 1 is caused to shake along the X axis, a force F1 is applied; and when the optical lens is caused to shake along the X axis next time, the direction of the force F1 is opposite to the last time, so that the shaking direction of the optical lens 1 is opposite; applying a force F3 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 opposite to the previous time, so that the shake direction of the optical lens 1 is opposite.
According to the principle of improving the pixel points by dithering, four different pairs of low-resolution images need to be projected to four directions by the optical lens respectively, and the false image that the pixel points are improved by 4 times is obtained through the phenomenon of human vision residue. 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 inside the paper surface to outside the paper surface, which causes the left half of the optical lens 1 to invert along the Y-axis and the right half to evert 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 inside the paper surface to outside the paper surface, which causes the upper half of the optical lens 1 to turn outwards along the X-axis and the lower half to turn inwards 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 equal to and opposite to that at time I. So that the driving device III9 generates a force F3 perpendicular to the paper surface and from outside the paper surface to inside the paper surface, which causes the left half of the optical lens 1 to evert along the Y-axis and the right half to evert 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 equal to and opposite to that at time II. So that the driving device I7 generates a force F1 which is perpendicular to the paper surface and is from the outside of the paper surface to the inside of the paper surface, and the upper half part of the optical lens is enabled to be turned inwards along the X axis and the lower half part of the optical lens is enabled to be turned outwards along the X axis. The projected image is shown in fig. 12.
The steps are circulated, and the promotion of 4 times of pixel points can be generated.
When the 2-time pixel point needs to be improved, the driving device drives the optical lens 1 to shake by taking the angular bisector of the two mutually perpendicular axes as the axis, and the directions of the two adjacent shakes are opposite. The two mutually perpendicular axes are an X axis and a Y axis. Because optical lens 1 is preferably rectangular, the X-axis and the Y-axis are two perpendicular central axes of optical lens 1, respectively. And the angular bisector of the X axis and the Y axis is a 45-degree axis. When the 2-time pixel points are improved, the driving device applies force perpendicular to the plane of the optical lens 1 on the side edges of the X axis and the Y axis at the same time to enable the optical lens to shake along the 45-degree axis; and the directions of the forces causing the optical lens to shake twice in the adjacent directions are opposite.
Embodiment 3 is a driving method using 4 driving devices to improve the pixel by 2 times. The force applied by the driving device comprises four forces, namely a force F1, a force F2, a force F3 and a force F4, wherein the force F1 and the force F2 are respectively arranged on two sides of an X axis, and the force F3 and the force F4 are respectively arranged on two sides of a Y axis; the force F1 and the force F3 are positioned on the same side of the 45-degree axis, and the force F2 and the force F4 are positioned on the other side of the 45-degree 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 edges of the optical lens 1; the drive means I7 and II8 are arranged on the long side of the optical lens 1 and the drive means III9 and IV10 are arranged on the short side of the optical lens 1. The force F1 is the same as the force F2, and the force F3 is the same as the force F4; and forces F1 and F2 are greater than forces F3 and F4. The principle is that since the moments of the forces F1 and F2 are short, the forces F1 and F2 should be larger than the forces F3 and F4 according to the lever principle in order to combine a resultant force direction of 45 °.
The optical lens 1 shakes along the 45-degree axis under the resultant force of the four forces of the force F1, the force F2, the force F3 and the force F4; force F1, force F2, force F3 and force F4 are exerted simultaneously; forces F1 and F3 are in the same direction, force F2 and F4 are in the same direction, and forces F1 and F3 are in the opposite direction to forces F2 and F4; and the directions of the four forces F1, F2, F3 and F4 are opposite to the previous direction at the time of the next shake, so that the shake direction of the optical lens 1 is opposite.
According to the principle of improving the pixel points by dithering, the optical lens 1 needs to project two different pairs of low-resolution images to two directions respectively, and the false image that the pixel points are improved by 2 times is obtained through the visual residual phenomenon of human eyes. The method comprises the following specific steps:
as shown in fig. 17, at time I, drive I7 and drive III9 are controlled to apply forces F1 and F3 perpendicular to the paper and from inside the paper to outside the paper; the driving device II8 and the driving device IV10 are controlled to apply a force F2 and a force F4 which are perpendicular to the paper surface and are from the outside of the paper surface to the inside of the paper surface, so that the left upper part of the optical lens 1 is enabled to be outwards turned along the resultant force direction, namely the 45-degree axis, and the right lower part of the optical lens 1 is enabled to be inwards turned.
As shown in fig. 18, at time II, the driving device I7 and the driving device III9 are controlled to apply the force F1 and the force F3 perpendicular to the paper surface and from the outside of the paper surface into the paper surface; the driving device II8 and the driving device IV10 are controlled to apply a force F2 and a force F4 perpendicular to the paper surface and from inside the paper surface to outside the paper surface, so that the left upper part of the optical lens 1 is turned inside and the right lower part is turned outside along the resultant force direction, i.e. 45 deg. axis.
The above steps are repeated, and the optical lens 1 projects an image as shown in fig. 19, thereby generating 2 times of pixel point lifting.
Embodiment 4 is to adopt the driving method of 2 driving devices to promote 2 times of pixel. The force applied by the driving device comprises a force F1 at the X-axis side and a force F3 at the Y-axis side respectively; and the force F1 and the force F3 are positioned on the same side of the 45-degree axis; the forces F1 and F3 are applied 9 by the drive means I7 and III, respectively; the drive I7 is arranged on the long side of the optical lens 1 and the drive III9 is arranged on the short side of the optical lens 1. The force F1 is greater than the force F3. The principle is that since the moment of the force F1 is short, the force F1 should be larger than the force F3 according to the lever principle in order to synthesize a resultant force direction of 45 °.
The optical lens 1 shakes along the 45 ° axis under the resultant force of the force F1 and the force F3; the force F1 and the force F3 are applied simultaneously and in the same direction; and the direction of the force F1 and the force F3 at the time of the next shake is opposite to the previous one so that the shake direction of the optical lens 1 is opposite.
According to the principle of improving the pixel points by dithering, the optical lens 1 needs to project two different pairs of low-resolution images to two directions respectively, and the false image that the pixel points are improved by 2 times is obtained through the visual residual phenomenon of human eyes. 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 the force F1 and the force F3 perpendicular to the paper surface and from the inside of the paper surface to the outside of the paper surface, so that the upper left portion of the optical lens 1 is everted along the resultant direction, i.e., 45 ° axis, and the lower right portion is everted.
As shown in the figure, at time II, the driving device I7 and the driving device III9 are controlled to apply the force F1 and the force F3 perpendicular to the paper surface and from the outside of the paper surface to the inside of the paper surface, so that the upper left part of the optical lens 1 is turned inside and the lower right part is turned outside along the resultant direction, namely, 45 ° axis.
And (4) circulating the steps, and projecting the image as shown in the figure to generate 2 times of pixel point promotion.
It should be noted that the arrangement of 2 and 4 driving devices is only used to show the person skilled in the art how to drive the optical lens dithering to implement the present invention, and is not used to limit the specific embodiments of the present invention. In fact, the present invention can be implemented as long as the optical lens 1 can be driven by the driving device to shake alternately along two mutually perpendicular axes, and can also shake along the direction of the resultant force of the two axes.
In order to ensure that the optical lens 1 can shake along the bisector of the angles of the X-axis and the Y-axis, i.e. along the 45 ° axis, it can be confirmed by the simulation test platform whether the resultant forces of F1 and F3 and F2 and F4, or the resultant forces 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 varied by increasing or decreasing the current to the coil.
In addition, the invention also provides a projector which comprises a galvanometer, wherein the galvanometer is controlled by the method, so that the improvement of 2 times and 4 times of pixel points is realized.
The above are only preferred embodiments of the present invention, and it should be noted that the above preferred embodiments should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the 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 these modifications and adaptations should be considered within the scope of the invention.

Claims (10)

1. A method for controlling a galvanometer to realize pixel point lifting by 2 times and 4 times is characterized in that:
when the pixel points are increased by 4 times, the driving device drives the optical lens to shake alternately along two mutually vertical axes, and the directions of the two adjacent times of shaking along the same axis are opposite;
when the 2-time pixel point is improved, the driving device drives the optical lens to shake by taking the angular bisector of the two mutually perpendicular axes as the axis, and the directions of the shake of the two adjacent times are opposite.
2. The method for controlling the galvanometer to realize pixel point lifting by 2 times and 4 times according to claim 1, wherein the method comprises the following steps: 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 points are increased by 4 times, the driving device alternately applies force perpendicular to the plane of the optical lens on the side edges of the X axis and the Y axis to enable the optical lens to shake alternately along the two axes; and the directions of the forces for promoting the optical lens to shake along the same axis in two adjacent times are opposite;
when the 2-time pixel points are improved, the driving device simultaneously applies force vertical to the plane of the optical lens on the X-axis and the Y-axis to enable the optical lens to shake along the 45-degree axis; and the directions of the forces causing the optical lens to shake in two adjacent times are opposite.
3. The method for controlling the galvanometer to realize pixel point lifting by 2 times and 4 times according to claim 2, wherein the method comprises the following steps: the optical lens is rectangular, and the X axis and the Y axis are two perpendicular central axes of the optical lens respectively.
4. The method for controlling the galvanometer to realize pixel point lifting by 2 times and 4 times according to claim 3, wherein the method comprises the following steps: the force applied by the driving device comprises four forces, namely a force F1, a force F2, a force F3 and a force F4, wherein the force F1 and the force F2 are respectively arranged on two sides of an X axis, and the force F3 and the force F4 are respectively arranged on two sides of a Y axis; the force F1 and the force F3 are positioned on the same side of the 45-degree axis, and the force F2 and the force F4 are positioned on the other side of the 45-degree 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 urging of the force F1, the force F2, the force F3 and the force F4;
when the optical lens is caused to shake along the X axis, the force F1 and the force F2 are applied simultaneously and in opposite directions; when the optical lens is caused 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 shaking direction of the optical lens is opposite;
when the optical lens is promoted to shake along the Y axis, the force F3 and the force F4 are applied simultaneously and in opposite directions; and the next time the optical lens is caused to shake along the Y-axis, the directions of the force F3 and the force F4 are 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 four forces, namely force F1, force F2, force F3 and force F4; force F1, force F2, force F3 and force F4 are exerted simultaneously; forces F1 and F3 are in the same direction, force F2 and F4 are in the same direction, and forces F1 and F3 are in the opposite direction to forces F2 and F4; and the directions of the four forces of the force F1, the force F2, the force F3 and the force F4 are opposite to the previous time when the optical lens is shaken next time, so that the shaking direction of the optical lens is opposite.
5. The method for controlling the galvanometer to realize pixel point lifting by 2 times and 4 times according to claim 4, wherein the method comprises the following steps: the four forces of the force F1, the force F2, the force F3 and the force F4 are respectively exerted by four driving devices of a driving device I, a driving device II, a driving device III and a driving device IV which are arranged on four sides of the optical lens, the driving device I exerts the force F1, the driving device II exerts the force F2, the driving device III exerts the force F3 and the driving device IV exerts the force F4; the drive means I and the drive means II are arranged on the long side of the optical lens and the drive means III and the drive means IV are arranged on the short side of the optical lens.
6. The method for controlling the galvanometer to achieve the pixel point improvement of 2 times and 4 times according to claim 5, wherein the method comprises the following steps: the force F1 is the same as the force F2, and the force F3 is the same as the force F4; and forces F1 and F2 are greater than forces F3 and F4.
A method for controlling a galvanometer to achieve pixel point lifting by 2 times and 4 times.
7. The method for controlling the galvanometer to realize pixel point lifting by 2 times and 4 times according to claim 3, wherein the method comprises the following steps: the force applied by the driving device comprises a force F1 at the side of the X axis and a force F3 at the side of the Y axis respectively; and the force F1 and the force F3 are located on the same side of the 45-degree axis;
if the pixel point is increased by 4 times, the optical lens is driven by the force F1 and the force F3 to shake alternately along the X axis and the Y axis;
applying a force F1 when the optical lens is caused to shake along the X axis; when the optical lens is caused to shake along the X axis next time, the direction of the force F1 is opposite to the last time, so that the shaking direction of the optical lens is opposite;
applying a force F3 when the optical lens is caused to shake along the Y axis; and when the optical lens is caused to shake along the Y axis next time, the direction of the force F3 is opposite to the last time, so that the shaking 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; the force F1 and the force F3 are applied simultaneously and in the same direction; and the direction of the force F1 and the force F3 at the time of the next shake is opposite to the previous one so that the shake direction of the optical lens is opposite.
8. The method for controlling the galvanometer to realize pixel point lifting by 2 times and 4 times according to claim 7, wherein the method comprises the following steps: the force F1 and the force F3 are respectively exerted by a driving device I and a driving device III, the driving device I exerts the force F1, and the driving device III exerts the force F3; the drive means I are arranged on the long side of the optical lens and the drive means III are arranged on the short side of the optical lens.
9. The method for controlling the galvanometer to realize pixel point lifting by 2 times and 4 times according to claim 8, wherein the method comprises the following steps: the force F1 is greater than the force F3.
10. A projector includes a galvanometer, characterized in that: the galvanometer is controlled by the method of any one of claims 1-9.
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