阅读说明：本技术 一种光束偏移装置、扫描方法、扫描装置及显示装置 (Light beam deviation device, scanning method, scanning device and display device ) 是由 张翠萍 严子深 胡飞 余新 李屹 于 2020-04-02 设计创作，主要内容包括：本申请公开了一种光束偏移装置、扫描方法、扫描装置及显示装置,该光束偏移装置包括驱动器和由驱动器驱动旋转的光偏移板,光偏移板包括多个偏移区域,多个偏移区域的折射率或厚度沿光偏移板的旋转方向单调变化,以在旋转周期内依次将扫描光束偏移预设偏移量,其中,光束偏移装置与扫描光束之间具有预设倾斜角。通过上述方式,本申请能够依次将扫描光束偏移预设偏移量,且结构简单,易于控制。(The application discloses a light beam deviation device, a scanning method, a scanning device and a display device, wherein the light beam deviation device comprises a driver and a light deviation plate driven by the driver to rotate, the light deviation plate comprises a plurality of deviation areas, the refractive indexes or the thicknesses of the deviation areas are monotonously changed along the rotation direction of the light deviation plate so as to sequentially deviate a scanning light beam by a preset deviation amount in a rotation period, and a preset inclination angle is formed between the light beam deviation device and the scanning light beam. Through the mode, the scanning beam deviation presetting device can be used for presetting the deviation quantity of the scanning beam deviation in sequence, and is simple in structure and easy to control.)

1. A beam shifting apparatus comprising a driver and a light shifting plate driven to rotate by the driver;

the light shifting plate comprises a plurality of shifting regions, the refractive indexes or the thicknesses of the plurality of shifting regions are monotonously changed along the rotating direction of the light shifting plate so as to sequentially shift the scanning light beam by preset shifting amounts in a rotating period, wherein a preset inclination angle is formed between the light beam shifting device and the scanning light beam.

2. The beam shifting apparatus of claim 1,

the preset offset is proportional to the thickness of the offset region.

3. The beam shifting apparatus of claim 2,

the thicknesses of the plurality of offset regions change in a stepwise manner or continuously in the rotation direction.

4. A scanning device, comprising:

a scanning light source for generating a scanning light beam;

at least one beam shifting device having a preset tilt angle with respect to the scanning beam, including a driver and a light shifting plate driven to rotate by the driver, the light shifting plate including a plurality of shifting regions;

wherein the refractive index or thickness of the plurality of shift regions changes monotonically along a rotation direction of the light shifting plate to sequentially shift the scanning beam by a preset shift amount within a rotation period.

5. The scanning device according to claim 4,

the scanning light source comprises at least one light-emitting element, and the scanning device further comprises a light source controller, wherein the light source controller is used for independently controlling each light-emitting element so as to adjust the light-emitting parameters of the light-emitting elements.

6. The scanning device according to claim 5,

the driver drives the light deflection plate to rotate at a constant speed in a preset rotation period, the rotation period comprises one or more than one scanning time slot, and in one scanning time slot, the preset offset is the product of the number of offset areas crossed by the scanning beam in the rotation direction and the preset unit offset.

7. The scanning device according to claim 4,

the at least one beam shifting device comprises a first beam shifting device and a second beam shifting device, and the duration of a first scanning period of the first beam shifting device is the duration of a scanning time slot in a second scanning period of the second beam shifting device; the normal of the inclination angle of the light shifting plate in the first light beam deflection device is perpendicular to the normal of the inclination angle of the light shifting plate in the second light beam deflection device.

8. The scanning device according to claim 7,

the diameters of the light deflection plates in the first light beam deflection device and the second light beam deflection device are both 110mm, the thickness difference of two adjacent deflection areas in the first light beam deflection device and the second light beam deflection device is both 0.5mm, and the preset inclination angle is 5 degrees.

9. The scanning device according to claim 6,

the scanning light source is a linear light source, the linear light source comprises a plurality of light-emitting elements which are arranged in the first direction, and the light beam deflection device deflects the preset inclination angle around the first direction; or the linear light source comprises a plurality of light emitting elements arranged according to the second direction, and the light beam deflection device deflects the preset inclination angle around the second direction.

10. The scanning device according to claim 9,

the diameter of a light deviation plate in the light beam deviation device is 100mm, the thickness difference of two adjacent deviation areas is 0.1mm, the refractive index of the deviation areas is 1.7, and the preset inclination angle is 20 degrees.

11. A scanning method based on the scanning device of any one of claims 4 to 10, characterized in that the method comprises:

controlling a scanning light source to emit scanning beams;

acquiring a preset scanning period corresponding to the light beam shifting device, and determining a reference rotating speed according to the scanning period, wherein the scanning period comprises a plurality of scanning time slots;

and controlling a driver of the light beam deviation device to drive the light deviation plate to rotate at a constant speed according to the reference rotating speed, wherein a deviation region of the light deviation plate corresponds to a scanning time slot in a scanning period, the rotation of the light deviation plate switches the deviation region for transmitting the scanning light beam, and the monotonous change of the thickness or the refractive index of the deviation region enables the scanning light beam to generate the monotonously changed light beam deviation in each scanning time slot in the scanning period.

12. A scanning method according to claim 11, wherein the beam shifting means comprises a first beam shifting means comprising a first driver and a first optical shifting plate and a second beam shifting means comprising a second driver and a second optical shifting plate, the first scanning period of the first beam shifting means having a duration of a scanning time slot within the second scanning period of the second beam shifting means; the step of controlling the driver of the light beam offset device to drive the light offset plate to rotate at a uniform speed according to the reference rotating speed comprises the following steps:

controlling the first driver to drive the first light shifting plate to rotate at a constant speed according to a first reference rotating speed, and controlling the second driver to drive the second light shifting plate to rotate at a constant speed according to a second reference rotating speed; the second reference rotation speed is less than the first reference rotation speed.

13. A display device, comprising a light source, an image light modulator, a light deflection device and an imaging device, wherein a light beam emitted from the light source is modulated by the image light modulator to output an image light beam, and the light deflection device time-divisionally deflects the image light beam to a pixel position of the display device to image to generate an image, wherein the light deflection device is the light deflection device according to any one of claims 1 to 3.

Technical Field

The present application relates to the field of scanning technologies, and in particular, to a light beam shifting apparatus, a scanning method, a scanning apparatus, and a display apparatus.

Background

The most common light beam deflection device at present is a scanning galvanometer, which is a special swing motor, and the basic principle is that a coil generates moment in a magnetic field, the light beam deflection device cannot rotate like a common motor, the periodic swing of a reflector can be controlled only by deflection, and when light irradiates on the reflector, the light beam deflection scanning is realized along with the swing of the reflector; because the movement of the reflecting mirror is controlled by means of deflection, the nonlinear control is realized, the distance between two adjacent scanning beams in the horizontal direction and the vertical direction is fixed, in order to move the scanning beams to the next preset position, the required driving force is changed nonlinearly, the swing motor cannot rotate at a constant speed, the magnitude of the driving force needs to be calculated in each deflection, an algorithm with higher accuracy is needed for control, the control difficulty is higher, the required time is longer, the response time is longer, and the quick scanning cannot be realized.

Disclosure of Invention

The application provides a light beam deviation device, a scanning method, a scanning device and a display device, which can deviate scanning light beams in sequence to preset deviation, and are simple in structure and easy to control.

In order to solve the technical problem, the technical scheme adopted by the application is as follows: there is provided a beam shifting device including a driver and a light shifting plate driven to rotate by the driver, the light shifting plate including a plurality of shifting regions whose refractive indexes or thicknesses vary monotonously in a rotating direction of the light shifting plate to sequentially shift a scanning beam by a preset shift amount within a rotation period, wherein the beam shifting device has a preset inclination angle with the scanning beam.

In one embodiment, the predetermined offset is proportional to the thickness of the offset region.

In another embodiment, the thickness of the plurality of offset regions varies stepwise or continuously in the direction of rotation.

In order to solve the technical problem, the technical scheme adopted by the application is as follows: there is provided a scanning device including: the scanning light source is used for generating a scanning light beam; at least one beam shifting device having a predetermined tilt angle with respect to the scanning beam comprises a driver and a light shifting plate driven to rotate by the driver, the light shifting plate comprising a plurality of shifting regions; wherein the refractive index or thickness of the plurality of shift regions changes monotonically along the rotation direction of the light shifting plate to sequentially shift the scanning beam by a preset shift amount within a rotation period.

In one embodiment, the scanning light source comprises at least one light emitting element, and the scanning device further comprises a light source controller for individually controlling each light emitting element to adjust a light emitting parameter of the light emitting element.

In another embodiment, the driver drives the light shifting plate to rotate at a constant speed with a preset rotation period, the rotation period includes one or more than one scanning time slot, and in one scanning time slot, the preset offset is the product of the number of offset regions crossed by the scanning beam in the rotation direction and the preset unit offset.

In another embodiment, the at least one beam shifting device comprises a first beam shifting device and a second beam shifting device, the duration of a first scan cycle of the first beam shifting device being the duration of a scan slot within a second scan cycle of the second beam shifting device; the normal to the tilt angle of the light shifting plate in the first beam deflection arrangement is perpendicular to the normal to the tilt angle of the light shifting plate in the second beam deflection arrangement.

In another embodiment, the diameters of the light shifting plates in the first light beam shifting device and the second light beam shifting device are both 110mm, the thickness difference between two adjacent shifting regions in the first light beam shifting device and the second light beam shifting device is both 0.5mm, and the preset inclination angle is 5 °.

In another embodiment, the scanning light source is a linear light source, the linear light source comprises a plurality of light emitting elements arranged in a first direction, and the beam deflecting device deflects a preset inclination angle around the first direction; or the linear light source comprises a plurality of light-emitting elements arranged according to a second direction, and the light beam deflection device deflects a preset inclination angle around the second direction.

In another embodiment, the diameter of the light-shifting plate in the beam-deflecting device is 100mm, the difference between the thicknesses of two adjacent deflecting regions is 0.1mm, the refractive index of the deflecting regions is 1.7, and the preset inclination angle is 20 °.

In order to solve the technical problem, the technical scheme adopted by the application is as follows: providing a scanning method based on the scanning device, the method comprising: controlling a scanning light source to emit scanning beams; acquiring a preset scanning period corresponding to the light beam shifting device, and determining a reference rotating speed according to the scanning period, wherein the scanning period comprises a plurality of scanning time slots; the driver of the light beam deviation device is controlled to drive the light deviation plate to rotate at a constant speed according to the reference rotating speed, a deviation area of the light deviation plate corresponds to a scanning time slot in a scanning period, the rotation of the light deviation plate switches the deviation area of the transmission of the scanning light beam, and the monotonous change of the thickness or the refractive index of the deviation area enables the scanning light beam to generate the monotonously changed light beam deviation in each scanning time slot in the scanning period.

In one embodiment, the beam shifting device comprises a first beam shifting device and a second beam shifting device, the first beam shifting device comprises a first driver and a first optical shifting plate, the second beam shifting device comprises a second driver and a second optical shifting plate, the duration of a first scanning period of the first beam shifting device is the duration of a scanning time slot within a second scanning period of the second beam shifting device; the method comprises the following steps that the normal line of the inclination angle of the first light shifting plate is vertical to the normal line of the inclination angle of the second light shifting plate, and a driver of the light beam shifting device is controlled to drive the light shifting plate to rotate at a constant speed according to a reference rotating speed: controlling a first driver to drive a first light shifting plate to rotate at a constant speed according to a first reference rotating speed, and controlling a second driver to drive a second light shifting plate to rotate at a constant speed according to a second reference rotating speed; the second reference rotation speed is less than the first reference rotation speed.

In order to solve the technical problem, the technical scheme adopted by the application is as follows: provided is a display device including: the light source, the image light modulator, the light deflection device and the imaging device, the light beam emitted by the light source is modulated by the image light modulator to output the image light beam, the light deflection device deflects the image light beam to the pixel position of the display device in a time-sharing manner to generate an image through imaging, wherein the light deflection device is the light deflection device.

Through the scheme, the beneficial effects of the application are that: the light beam shifting device comprises a driver and a light shifting plate driven by the driver to rotate, a preset inclination angle is formed between the light beam shifting device and an incident scanning light beam, and the refractive indexes or the thicknesses of a plurality of shifting areas in the light shifting plate are monotonously changed along the rotation direction of the light shifting plate; when the control driver drives the light shifting plate to rotate at a constant speed, scanning beams enter a plurality of offset areas of the light shifting plate in sequence at each scanning time slot, time-sharing offset of the scanning beams is realized, and because the light shifting plate can rotate at a constant speed, a linear control method is adopted.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:

FIG. 1 is a schematic view of a tilted glass sheet to effect light translation;

FIG. 2 is a schematic structural diagram of an embodiment of a beam shifting apparatus provided herein;

FIG. 3(a) is a schematic view showing the structure of the light shift plate in the embodiment shown in FIG. 2;

FIG. 3(b) is another schematic view of the light shift plate in the embodiment shown in FIG. 2;

FIG. 3(c) is a schematic view showing still another structure of the light shift plate in the embodiment shown in FIG. 2;

FIG. 4 is a schematic structural view of the stepped light shifting plate in the embodiment of FIG. 2;

FIG. 5 is a schematic structural diagram of an embodiment of a scanning device provided in the present application;

FIG. 6 is a schematic structural diagram of another embodiment of a scanning device provided in the present application;

FIG. 7 is a schematic diagram of the structure of the offset region in the embodiment shown in FIG. 6;

FIG. 8 is a schematic view showing control of each light emitting element at the time of scanning in the embodiment shown in FIG. 6;

FIG. 9 is a schematic structural diagram of a scanning device according to another embodiment of the present application;

FIG. 10 is a schematic structural diagram of a scanning device according to still another embodiment of the present application;

FIG. 11 is a schematic flow chart diagram illustrating an embodiment of a scanning method provided herein;

fig. 12 is a schematic structural diagram of an embodiment of a display device provided in the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Because the refractive index of the transparent flat plate (mostly made of glass material) is different from that of air, light can be refracted twice when passing through, so that the position of the light emergent point has certain translation relative to the position of the light incident point, as shown in fig. 1, the inclined transparent flat plate can translate the input light by a determined distance, the translation amount of the light can be influenced by the inclination angle, the thickness of the transparent flat plate and the refractive index, and the relationship between the translation amount and the refractive index and the inclination angle is as follows:

where Δ y is the amount of translation, t is the thickness, n is the refractive index, and θ is the tilt angle.

Referring to fig. 2 and 3, fig. 2 is a schematic structural diagram of an embodiment of a beam shifting apparatus provided in the present application, and fig. 3 is a schematic structural diagram of a light shifting plate, where the beam shifting apparatus includes a driver 11 and a light shifting plate 12 driven by the driver 11 to rotate.

The light shifting plate 12 includes a plurality of offset regions 121, the light shifting plate 12 may be a transparent glass plate, and the offset regions 121 may be circular, fan-shaped, or fan-shaped circular rings, for example, a circular region shown in fig. 3(a), a fan-shaped region shown in fig. 3(b), a fan-shaped circular ring shown in fig. 3(c), or may have other shapes such as a quadrangle.

The preset offset is proportional to the thickness of the offset region 121, specifically, as can be seen from the formula of the offset, when the refractive index and the inclination angle of the offset region 121 are fixed, the offset of the light is proportional to the thickness of the offset region 121, so that the offset of the light can be directly changed by changing the thickness, or when the thickness and the inclination angle of the offset region 121 are fixed, the offset of the light increases with the increase of the refractive index of the transparent flat plate, so that the offset of the light can be directly changed by changing the refractive index, thereby realizing the directional offset of the light; the refractive index or thickness of the plurality of shift regions 121 may be set to vary monotonically along the rotation direction of the light shifting plate 12 to sequentially shift the scanning beam by a preset shift amount within a rotation period, wherein the beam shifting device has a preset tilt angle with respect to the scanning beam.

Since it is easier to realize and easier to handle to provide a plurality of offset regions 121 along the rotation direction than to provide a refractive index along the rotation direction, and the refractive index variation may need to be satisfied by using different materials, the present embodiment is mainly described by taking the thickness variation as an example.

In a specific embodiment, the refractive index or thickness of the plurality of offset regions 121 may be gradually increased along the rotation direction of the light shift plate 12, and further, the thickness of the plurality of offset regions 121 may be changed in a stepwise manner or continuously in the rotation direction.

The optical shift plate 12 includes a plurality of offset regions 121 having a stepwise thickness, as shown in fig. 4, the inclination angle of the optical shift plate 12 is θ, when the optical shift plate 12 is driven by the driver 11 to rotate, the scanning beam sequentially passes through the offset regions 121 having different thicknesses, and is deflected by different offset amounts, and directional scanning is realized by controlling the thickness difference between the plurality of offset regions 121 and the inclination angle of the offset regions 121.

Referring to fig. 5, fig. 5 is a schematic structural diagram of an embodiment of a scanning device provided in the present application, the scanning device including: a scanning light source 21 and at least one beam shifting device 22.

The scanning light source 21 is used for generating a scanning light beam, the scanning light source 21 may be a laser light source, the light intensity of the scanning light beam may be modulated by using an optical modulator, the optical modulator may be electro-optical modulation or acousto-optical modulation, the three-color laser is changed into a laser beam with different light intensities of a video signal after passing through the optical modulator loaded with the video signal, and the laser beam is formed by color combination.

Further, the scanning Light beam includes at least one sub-Light beam, the scanning Light source 21 includes at least one Light Emitting element 211, each sub-Light beam corresponds to one Light Emitting element 211, and the Light Emitting elements 211 include, but are not limited to, VCSELs (Vertical Cavity Surface Emitting Lasers), EELs (Edge Emitting Lasers), LEDs (Light Emitting diodes), Micro LEDs, or the like; the scanning device further comprises a light source controller 212, wherein the light source controller 212 is used for individually controlling each light-emitting element 211 so as to adjust the light-emitting parameters of the light-emitting elements 211; specifically, the scanning light source 21 uses an electrode having independent control over each light emitting element 211, and fast single-point control over each light emitting element 211 can be achieved by the light source controller 212, and the light emitting parameters include whether to emit light, light emitting brightness, light emitting time, and the like.

The light beam shifting device 22 has a preset inclination angle with respect to the scanning light beam, the light beam shifting device 22 includes a driver 221 and a light shifting plate 222 driven to rotate by the driver 221, and the light shifting plate 222 includes a plurality of shifting regions whose refractive indexes or thicknesses change monotonously in a rotating direction of the light shifting plate 222 to sequentially shift the scanning light beam by a preset shift amount in a rotation period.

The driver 221 can drive the light shifting plate 222 to rotate at a constant speed in a preset rotation period, where the rotation period includes one or more scanning time slots, and in one scanning time slot, the preset offset is the product of the number of offset regions crossed by the scanning beam in the rotation direction and the preset unit offset; for example, the light shifting plate 222 includes 3 shifting regions, and the predetermined unit shift amount is L, so that the predetermined shift amount is L when the scanning beam passes through the first shifting region, the predetermined shift amount is 2 × L when the scanning beam passes through the second shifting region, and the predetermined shift amount is 3 × L when the scanning beam passes through the third shifting region in one scanning slot.

The scanning step can be determined by the thickness difference between two adjacent offset regions, the tilt angle of the light-shifting plate 222 and the refractive index of the light-shifting plate 222, the scanning speed can be determined by the rotation speed of the light-shifting plate 222, and the scanning range can be determined by the number of offset regions; the wavefront plane angle between the offset region and the scanning beam is θ, when the scanning beam passes through two adjacent offset regions, Δ Y is offset, if there are N offset regions on the optical offset plate 222, the scanning range Y is N × Δ Y, and when the optical offset plate 222 rotates once, one scan can be completed.

In a specific embodiment, as shown in FIG. 6, the at least one beam shifting device 22 comprises a first beam shifting device and a second beam shifting device, the first beam shifting device deflecting a predetermined tilt angle about a first direction, the first beam shifting device comprising a first predetermined number of shifting regions; the second light beam shifting device deflects a preset inclination angle around a second direction perpendicular to the first direction, the second light beam shifting device comprises a second preset number of shifting regions, the first direction can be an x direction, the second direction can be a y direction, the duration of a first scanning period of the first light beam shifting device is the duration of a scanning time slot in a second scanning period of the second light beam shifting device, and the inclination angle normal of the light shifting plate in the first light beam shifting device is perpendicular to the inclination angle normal of the light shifting plate in the second light beam shifting device, for example, the second scanning period is 4s, the second scanning period comprises 4 scanning time slots, and the duration of the first scanning period is 1 s.

The scanning light source 21 is an array light source, that is, the scanning light source 21 includes a plurality of light emitting elements 211 arranged in an array, since the array light source needs to be independently addressed and controlled, the light emitting elements can be arranged in a sparse lattice form to form an M × N lattice, through an optical imaging lens, M × N sparse pixel points can be realized on the screen 23, in order to display a frame of densely arranged image, the image can be split into a × b subframes displayed in a time division multiplexing manner, that is, light spots corresponding to each independently addressed and controlled light emitting element 211 are expanded into densely arranged a × b light spots through time division multiplexing, corresponding to a × b densely arranged pixels in a frame of image, the gaps between the light spots corresponding to adjacent independently addressable and controlled light emitting elements 211 are just filled, wherein a is a first preset number, and b is a second preset number.

As shown in fig. 6, two stepped light shifting plates 222 are used as scanning devices, that is, a first light shifting plate 222a and a second light shifting plate 222b, the first light shifting plate 222a is disposed around the x axis by deflecting the θ angle, so that the sparse array light source can be scanned a times in the y direction, the second light shifting plate 222b is disposed around the y axis by deflecting the θ angle, so that the sparse array light source can be scanned b times in the x direction, and finally (a × M) × (b × N) pixels are realized on the screen 23; because the moving time of the scanning light beam is far shorter than the time that the human eye persistence phenomenon can respond, the integral effect of the human eye splices the light spots corresponding to one scanning time slot into a complete image.

For example, the light emitting elements 211 are VCSELs, the diameter of the light emitting elements 211 is 15 μm, the pitch of each light emitting element 211 in the x direction and the y direction is 150 μm, 200 light emitting elements 211 are in the x direction, 100 light emitting elements 211 are in the y direction, the length of the whole array light source is about 30mm, and the width is about 15 mm; the diameters of the light shifting plates 222a in the first light beam deflecting device and the light shifting plates 222b in the second light beam deflecting device are both 110mm, the first preset number and the second preset number are both 10, as shown in fig. 7, the thickness difference between two adjacent shifting regions in the first light beam deflecting device and the second light beam deflecting device is both 0.5mm, for example, the thicknesses of the shifting regions are 0.5mm, 1mm, 1.5mm, … and 5mm in sequence, the arrangement is performed according to fig. 6, the first light shifting plate 222a is placed by deflecting 5 ° around the x axis, and the second light shifting plate 222b is placed by deflecting 5 ° around the y axis; the light emitting elements 211 are deflected 15 μm, 30 μm, …, 150 μm in the y-direction, respectively, through each of the offset regions of the first light shifting plate 222 a; through each of the offset regions of the second light shifting plate 222b, 15 μm, 30 μm, …, 150 μm, respectively, are deflected in the x-direction; when the first light shifting plate 222a is rotated at a rotation speed of 600r/s and the second light shifting plate 222b is rotated at a rotation speed of 60r/s, a resolution of 2k and a refresh rate of 60Hz can be achieved.

When the scheme is used for scanning the sparse array light source, different regions of the same sparse array light source may be in different deflection states, that is, different regions of the same sparse array light source display different contents, as an example, as shown in fig. 8, the sparse array light source is composed of 2 × 2 independently controlled light emitting elements 211 (numbered 1, 2, 3, 4 in fig. 8), the light emitting elements 211 are deflected once per rotation of the light deflecting plate 222 through a stepped light deflecting plate 222 with two thicknesses, the positions of the deflected light emitting elements 211 are numbered 1 ', 2 ', 3 ', 4 ', an image with 4 × 2 pixels is formed, and the image becomes a frame image, each frame image is composed of two sub-frames, the image of one sub-frame is composed of light spots at positions 1, 2, 3, 4, and the other sub-frame is composed of 1 ', 2 ', 3 ', 4 ' positions.

When the stepped light shift plate 222 is turned from the position a to the position B in fig. 8 at time t1, only the light spot at the position 2 is deflected to the position 2', and the content displayed by the light emitting element 211 changes to the content of the second sub-frame, and the content displayed by the light emitting elements 211 at other positions keeps displaying the content of the first sub-frame; when the light shifting plate 222 is turned to the C position at time t2, only the 1-position light spot is deflected to the 1' position, and the display content thereof is changed to the content of the second sub-frame, and the display content of the light emitting elements 211 at other positions is not changed; by analogy, when the light shifting plate 222 rotates to the D position and the E position, the content displayed by the light emitting elements 211 at the 3 and 4 positions changes sequentially.

When the scheme is used for scanning the sparse array, the display signal change of each independently controlled light-emitting element 211 is not completed at the same time, but is determined by the deflection time of each light-emitting element 211, and the specific situation can be determined according to the geometric size of the actually designed light shifting plate 222 and the geometric size of the sparse array light source.

In another specific embodiment, the scanning light source 21 is a linear light source, the linear light source includes a plurality of light emitting elements 211 arranged in a first direction, the light beam shifting device 22 deflects a preset inclination angle around the first direction, specifically, the light shifting plate 22 in the light beam shifting device 22 deflects a preset inclination angle around the first direction, as shown in fig. 9; or the linear light source includes a plurality of light emitting elements 211 arranged in a second direction perpendicular to the first direction, and the light beam shift device 22 deflects a predetermined inclination angle around the second direction, specifically, the light shift plate 22 in the light beam shift device 22 deflects a predetermined inclination angle around the first direction, as shown in fig. 10.

Further, a linear array form may be adopted, the plurality of light emitting elements 211 are arranged into a 1 × N dot matrix, and 1 × N pixel points may be implemented on the screen 23 through the optical imaging lens; to display a frame of image with closely-spaced pixels, one frame of mxn image needs to be split into mx 1 sub-frames for display in a time-division multiplexing manner, i.e. the light spot corresponding to each light-emitting element 211 controlled by independent addressing is expanded into M × 1 closely-spaced strip-shaped light spots through time-division multiplexing.

As shown in fig. 9, 1 optical shift plate 222 having M shift regions is used as a scanning device, and the optical shift plate 222 is disposed around the x axis by a θ degree, so that the light emitting element 211 can be shifted M times in the y direction, and finally M × N closely-spaced pixels are realized on the screen 23.

For example, 640 VCSELs controlled by independent addressing are closely arranged into a line light source, the diameter of each light emitting element 211 is 15 μm, the total length of the line light source is about 10mm, the diameter of the light shifting plate in the beam shifting device 22 is 100mm, the number of the shifting regions is 480, the thickness difference between two adjacent shifting regions is 0.1mm, the refractive index of the shifting regions is 1.7, and the preset inclination angle is 20 °, that is, the light shifting plate 222 is placed at 20 degrees with respect to the wavefront plane of the scanning beam; when the light shifting plate 222 is rotated, the light emitting elements 211 sequentially deflect 15um, 30um, 45um and … in the y direction through each shifting region, so that 640 × 480 pixels are densely arranged; when the light shifting plate 222 is rotated at a rotation speed of 60r/s, a resolution of 480P and a refresh rate of 60Hz can be achieved.

This embodiment provides a device through rotatory mode realization scanning, through rotatory one light offset plate 222 that has different thickness or refracting index, make scanning beam take place the translation of different distances, only need drive light offset plate 222 at the uniform velocity rotate, can guarantee that scanning beam takes place orderly deflection, thereby realize the scanning of light beam, need not to carry out nonlinear control to the speed of light offset plate 222, and control is simple, and response speed is fast, and the advantages such as low noise, low power consumption, low cost and high accuracy are possessed.

Referring to fig. 5 and fig. 11, fig. 11 is a schematic flowchart illustrating an embodiment of a scanning method according to the present application, where the scanning method is based on a scanning apparatus in the above embodiment, and the method includes:

step 11: and controlling the scanning light source to emit scanning light beams.

The scanning light source 21 includes at least one light emitting element 211, and the light emitting element 211 can be controlled to emit light, so as to generate a scanning light beam, the scanning light beam includes at least one sub-light beam, each sub-light beam corresponds to one light emitting element 211, and the light emitting elements 211 include but are not limited to VCSELs, EELs, LEDs, Micro LEDs, or the like.

Step 12: and acquiring a preset scanning period corresponding to the light beam deviation device, and determining the reference rotating speed according to the scanning period.

The angle between the beam shifting device 22 and the scanning beam is a preset inclination angle, the beam shifting device 22 comprises a driver 221 and a light shifting plate 222 driven by the driver 221 to rotate; the beam shifting device 22 can operate according to a preset scanning period when shifting the scanning beam, and the scanning device can determine the rotation speed of the light shifting plate 222, i.e. the reference rotation speed, according to the duration of the preset scanning period.

Further, the light shifting plate 222 includes a plurality of offset regions, a shift region of the light shifting plate 222 corresponds to a scan time slot within a scan cycle, rotation of the light shifting plate 222 switches the shift region through which the scanning light beam is transmitted, and monotonic variation in thickness or refractive index of the shift regions causes the scanning light beam to generate a monotonically varying light beam shift in each scan time slot within the scan cycle.

Step 13: and controlling a driver of the light beam deviation device to drive the light deviation plate to rotate at a constant speed according to the reference rotating speed.

After the reference rotation speed of the light shifting plate 222 is determined, a control command may be issued to the driver 221, so that the driver 221 drives the light shifting plate 222 to rotate, the light shifting plate 222 is acted by the driver 221 to rotate at a constant speed at the reference rotation speed, and when a scanning beam is incident on the offset region of the light shifting plate 222, the scanning beam is deflected by the offset region and is offset by a preset offset amount along a certain direction, thereby implementing scanning of the beam.

In a specific embodiment, as shown in fig. 6, the at least one light beam shifting device 222 includes a first light beam shifting device and a second light beam shifting device, the first light beam shifting device includes a first driver and a first light shifting plate 222a, the second light beam shifting device includes a second driver and a second light shifting plate 222b, a duration of a first scanning period of the first light beam shifting device is a duration of a scanning time slot within a second scanning period of the second light beam shifting device, and a normal of an inclination angle of the first light shifting plate 222a is perpendicular to a normal of an inclination angle of the second light shifting plate 222b, that is, the first light beam shifting device deflects a preset inclination angle around a first direction, and the second light beam shifting device deflects the preset inclination angle around a second direction perpendicular to the first direction.

Further, in order to realize the scanning, the first driver may be controlled to drive the first light shifting plate 222a to rotate at a constant speed according to a first reference rotation speed, and the second driver may be controlled to drive the second light shifting plate 222b to rotate at a constant speed according to a second reference rotation speed, where the second reference rotation speed is less than the first reference rotation speed.

The light deflection plates 222 with a plurality of refractive indexes or thicknesses changing along the rotation direction are used for deflecting the scanning beams in the embodiment to realize the directional scanning of the beams, and due to the height difference between two adjacent deflection areas, the scanning beams can be quantitatively deflected by utilizing the height difference, so that the scanning is realized, and the light deflection plates 222 can be controlled at a constant speed, and are simple to control and easy to operate.

Referring to fig. 12, fig. 12 is a schematic structural diagram of an embodiment of a display device provided in the present application, and the display device 30 includes: a light source 31, an image light modulator 32, a light deflection device 33 and an imaging device 34.

The light beam emitted by the light source 31 is modulated by the image light modulator 32 to output an image light beam, and the light source 31 may be a laser light source or a laser fluorescence light source, for example, the light source 31 includes a blue laser that emits blue laser light that excites a fluorescent substance to generate green fluorescence and red fluorescence that are combined with the blue laser light into a light beam; the image light modulator 32 may be a DMD (Digital Micro-mirror Device), and a light beam incident to the DMD may be modulated by the DMD, thereby generating an image light beam, and emitted to the light shifting Device 33.

The light deflection device 33 deflects the image light beams in a time-sharing manner to the pixel positions of the imaging device 34 to form an image, the light deflection device 33 is the light deflection device, a driver in the light deflection device 33 can drive the light deflection plate to rotate, the light deflection plate comprises a plurality of deflection areas, the image light beams are deflected after entering the deflection areas, the image light beams emitted from the deflection areas are displayed on the imaging device 34 in a time-sharing manner, so that the image can be observed by human eyes, and the imaging device 34 can be a screen.

In the present embodiment, a display device 30 is provided, in which a driver is used to drive a light shifting plate to rotate, and since the light shifting plate includes a plurality of offset regions, and the refractive indexes or thicknesses of the plurality of offset regions change monotonically along the rotation direction of the light shifting plate, when an image beam is incident on the offset regions, offsets of different distances are generated, and then the image is formed on an imaging device 34, and since the light shifting plate can rotate at a constant speed, the control is easy.

The above embodiments are merely examples, and not intended to limit the scope of the present application, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present application, or those directly or indirectly applied to other related arts, are included in the scope of the present application.