CN113946046A - Beam shifting device and projection system - Google Patents

Beam shifting device and projection system Download PDF

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Publication number
CN113946046A
CN113946046A CN202010694614.XA CN202010694614A CN113946046A CN 113946046 A CN113946046 A CN 113946046A CN 202010694614 A CN202010694614 A CN 202010694614A CN 113946046 A CN113946046 A CN 113946046A
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Prior art keywords
disk
disc
scanning
scanning beam
regions
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CN202010694614.XA
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Chinese (zh)
Inventor
胡飞
陈晨
张翠萍
李屹
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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Priority to CN202010694614.XA priority Critical patent/CN113946046A/en
Priority to PCT/CN2021/106671 priority patent/WO2022012652A1/en
Publication of CN113946046A publication Critical patent/CN113946046A/en
Pending legal-status Critical Current

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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
    • 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
    • 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
    • G02B26/10—Scanning systems
    • 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]
    • 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

Abstract

The embodiment of the application provides a light beam shifting device, which comprises a disc and a driver, wherein the disc comprises a plurality of disc areas, and the disc areas are configured to have a certain inclination angle relative to a scanning light beam; the driver is used for driving the disc to rotate, the refractive indexes or the thicknesses or the inclination angles of the areas of the plurality of disc areas are increased/decreased along the rotating direction, and the areas of the plurality of disc areas sequentially shift the scanning light beam by preset shift amount in a rotating period. When the scanning beam enters the inclined incident surface, the scanning beam is subjected to the offset effect of different incident surfaces and then exits along different light paths, so that different disc areas can be rotated to the light paths of the scanning beam according to different offset requirements on the scanning beam, accurate pixel expansion is realized, and the display resolution is improved. Meanwhile, the application also provides a projection system.

Description

Beam shifting device and projection system
Technical Field
The application relates to the technical field of projection, in particular to a light beam deviation device and a projection system.
Background
Many movie theaters today are not using traditional motion picture technology, such as full-size film, but instead employ digital processing technology. A digital movie can be transmitted by several routes: hard disks or optical disks such as blu-ray disks are mailed over a network or a dedicated satellite network, or physically. Digital cinema uses digital image projectors rather than traditional cinema projection systems. In digital cinema, the resolution is typically represented by horizontal resolution, such as 2K (2048 x 1080 pixels or 220 ten thousand pixels) or 4K (4096 x 2160 pixels or 880 ten thousand pixels).
Digital Light Processing (DLP) is a Light control technology that can be applied to various projection systems. DLP projection systems typically use a converging light beam to illuminate a controllable multi-micromirror surface, and an integrating lens to converge the light reflected from the micromirror surface and project the reflected light onto a projection plane for imaging.
Micro mirror Device (DMD) chips have made significant advances in DLP projection technology. In addition to the commercial success of high definition television, DLP projection technology is also widely used in high definition displays, cinema projection, business, and personal projection systems. Meanwhile, the DLP technology is also applied to the fields of medical images, photo processing and printing technology, biotechnology, photoetching, spectrometers, scientific research instruments and the like.
In DLP projection display technology, the DMD is a crucial optical element, and directly determines the resolution of an image. In the market today, 4K resolution display systems have gradually become the mainstream display technology, and more 8K products have been proposed. However, the DMD chip with 4K resolution is expensive and is not suitable for many scenes.
In the prior art, a deflection device capable of improving Pixel Resolution through a Pixel expansion technology (XPR) appears, and such a device is mainly implemented by changing an incident angle of a scanning beam through mechanical inversion, but this mode needs to accurately control an inversion angle, a steady state of the deflection device needs a certain power, and power consumption of a device is large. In addition, the deflection device turns back and forth in various states and the frequency is high, which causes a certain noise. And since the force with which the sheet means is turned over in both states is large and there are two peaks, a certain vibration is caused to the whole system. The deflection device is overturned repeatedly, each impact force is large, and the structural stability is large.
Disclosure of Invention
The application aims to provide a light beam deviation device and a projection system, which can realize higher resolution effect at lower cost and have higher structural stability.
The embodiment of the application provides a light beam shifting device, which comprises a disc and a driver, wherein the disc comprises a plurality of disc areas, and the disc areas are configured to have a certain inclination angle relative to a scanning light beam; the driver is connected to the disk, the driver is used for driving the disk to rotate, the refractive indexes or thicknesses or the inclination angles of the areas of the disk are increased/decreased along the rotation direction, and the areas of the disk sequentially shift the scanning beam by preset shift amount in a rotation period.
In some embodiments, the scanning beam exits after being refracted in the disk, and when the scanning beam is incident on different disk regions, refraction angles in different disk regions are not equal.
In some embodiments, the refractive index of the plurality of disk regions increases/decreases along the rotational direction.
In some embodiments, each disk region has an equal thickness.
In some embodiments, the thickness of the plurality of disk regions increases/decreases along the rotational direction.
In some embodiments, each disk region has the same index of refraction.
In some embodiments, the disk region reflects the scanning beam, and when the scanning beam is incident on different disk regions, the reflection angles in different disk regions are not equal.
In some embodiments, the disk regions are arranged obliquely with respect to the axial direction of the driver, and the region inclination angles of the incidence faces of the different disk regions with respect to the axial direction of the driver increase/decrease in the rotational direction.
In some embodiments, the thickness of each of the disk regions increases gradually in a radial direction of the driver.
In a second aspect, embodiments of the present application further provide a projection system, which includes a light emitting assembly and the beam shifting apparatus, the light emitting assembly is configured to generate a scanning beam, and the disk area is configured to have a certain inclination angle with respect to the scanning beam and is configured to guide the scanning beam to a subsequent optical path.
The application provides a light beam deviation device drives the disc through the driver and rotates for different disc regions are located the light path of scanning beam, and when scanning beam incided in the disc region rather than the slope, the skew angle that receives different disc regions is inequality, can follow different light path outgoing, consequently can be applied to among the projection system, realizes the pixel extension, improves display resolution. The projection system applying the light beam offset device can realize pixel expansion through the light beam offset device, so that a high-resolution DMD chip is not needed, a high-resolution effect can be realized only by using a relatively low-resolution DMD chip, and the manufacturing cost of the high-resolution projection system can be reduced.
These and other aspects of the present application will be more readily apparent from the following description of the embodiments.
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.
Fig. 1 is a schematic structural diagram of a beam shifting apparatus according to a first embodiment of the present application;
FIG. 2 is a diagram illustrating a state of use of a beam shifting apparatus according to a first embodiment of the present application;
FIG. 3 is a diagram illustrating another state of use of a beam shifting apparatus according to a first embodiment of the present application;
FIG. 4 is a diagram illustrating a state of use of a beam shifting apparatus according to a second embodiment of the present application;
FIG. 5 is a diagram illustrating another example of a beam shifting apparatus according to a second embodiment of the present disclosure;
FIG. 6 is a diagram illustrating a state of use of a beam shifting apparatus according to a third embodiment of the present application;
FIG. 7 is a diagram illustrating another example of a beam shifting apparatus according to a third embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a projection system according to a fourth embodiment of 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 of 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.
In the prior art, in order to realize higher pixel resolution, a DMD chip with higher resolution needs to be used, and the cost of the DMD chip with high resolution is high, which is not favorable for popularization. The pixel shift resolution technology adopts the displacement (such as the distance of directional movement of half a pixel) of the pixel to realize the display image with higher resolution than the originally adopted DMD chip, and the display resolution can be improved. Therefore, the inventor proposes the beam shifting device and the projection system in the embodiments of the present application. Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
First embodiment
Referring to fig. 1, the present embodiment provides a beam shifting apparatus 100, the beam shifting apparatus 100 includes a disk 110 and a driver 120, wherein the driver 120 is connected to the disk 110 and is used for driving the disk 110 to rotate.
Specifically, in this embodiment, the disc 110 has a substantially planar plate-shaped structure, and the disc 110 may include a plurality of disc regions 111, where the number of the disc regions 111 may be any number of two, three, or more than three, and the area of each disc region 111 may be completely equal. At least two disk regions 111 may be disposed adjacent to each other or spaced apart from each other. As an embodiment, each disk region 111 may be substantially fan-shaped, and at least two disk regions 111 may be spliced into a circular structure. For example: in this embodiment, there are two disk regions 111, and both disk regions 111 have a substantially semicircular shape.
Each disk region 111 has an entrance face 114, and the entrance face 114 is configured to receive the scanning beam and direct the scanning beam to a subsequent optical path. The scanning beam refers to light rays which are generated and emitted by the light-emitting component and are reflected after the light rays enter the DMD chip. Referring to fig. 2, the disc region 111 is configured to have a certain inclination angle with respect to the scanning beam, that is, the disc region 111 is disposed obliquely with respect to the scanning beam, that is, an angle between the incident surface 114 and the scanning beam is greater than 0 ° and less than 90 °, that is, the scanning beam is incident on the incident surface 114 in a non-perpendicular manner and is guided by the incident surface 114 to propagate to a subsequent optical path.
The driver 120 is configured to drive the disk 110 to rotate, and when the disk 110 rotates, selectively make one of the plurality of disk regions 111 be located on the optical path of the scanning beam, and the incident surface 114 of the disk region 111 located on the optical path of the scanning beam receives the scanning beam and guides the scanning beam to a subsequent optical path.
The driver 120 is connected to the disc 110 and is disposed along a thickness direction of the disc 110, wherein the thickness direction of the disc 110 is a direction perpendicular to a plane of the disc 110, that is, an axis of the driver 120 is perpendicular to the plane of the disc 110. The advantages of this arrangement are: the disk 110 is rotated without changing the inclination angle with respect to the scanning beam, and thus can be disposed at a fixed inclination angle, which is the angle formed between the incident surface 114 and the scanning beam, thereby improving the stability of the device.
In some embodiments, the refractive index or thickness of the plurality of disk regions 111 increases/decreases along the rotational direction. Thus, when the scanning beam is incident on different disk regions 111, the formed emergent light beam is emitted to the subsequent light path along different light paths. Namely: when the scanning beams are incident on the incident surfaces 114 of the different disk regions 111, the light paths of the scanning beams when the scanning beams are emitted by the incident surfaces 114 are not overlapped.
Specifically, as an embodiment, referring to fig. 2 and fig. 3, in this embodiment, the disc 110 is a transparent disc, and the disc 110 can transmit the scanning beam, and the scanning beam enters the disc 110 and is refracted after entering the incident surface 114, and finally exits through the disc 110. The scanning beam is refracted in the disc 110 and then exits to form an emergent ray, the scanning beam and the emergent ray are parallel to each other, and when the scanning beam enters different disc areas 111, refraction angles in different disc areas 111 are not equal. Wherein the magnitude of the angle of refraction depends on the refractive index of the disk region 111, the thickness of the disk 110, and the like.
In this embodiment, referring to fig. 1, the disc 110 includes two disc regions 111, which are a first disc region 112 and a second disc region 113, respectively, and the refractive indexes of the first disc region 112 and the second disc region 113 are different and decrease/increase progressively along the rotation direction of the disc 110. And the incident surface 114 of the first disk region 112 is coplanar with the incident surface 114 of the second disk region 113. Wherein the refractive indices of the first and second disk regions 112 and 113, respectively, are n1And n2And n is1≠n2And n is1And n2Are all greater than n0(n0To scan the refractive index of the beam in air) and the first and second disk regions 112 and 113 may be made of different materials. Moreover, in the present embodiment, the thicknesses of the first disk region 112 and the second disk region 113 are both t, that is, the disk 110 is the disk 110 with the same thickness, which is advantageous for preparing the disk 110.
Fig. 2 shows a state where the scanning beam is incident on the incident surface 114 of the first disk region 112, and referring to fig. 2, when the scanning beam is incident on the incident surface 114 of the first disk region 112:
Figure BDA0002590517800000061
wherein, Δ y1The predetermined offset between the scanning beam L and the emergent ray is indicated, S1 is the emergent ray when the scanning beam is not refracted (the same below), and S2 is the actual emergent ray after refraction (the same below). Theta1Is the angle between the entrance face 114 of the first disc region 112 with respect to a plane P perpendicular to the scanning beam, and t is the thickness of the first disc region 112.
Fig. 3 shows a state when the scanning beam is incident on the incident surface 114 of the second disk region 113, and referring to fig. 3, when the scanning beam is incident on the incident surface 114 of the second disk region 113:
Figure BDA0002590517800000071
wherein, Δ y2Is a predetermined offset, theta, between the scanning beam and the emergent ray2Is the angle between the entrance face 114 of the second disc region 113 with respect to a plane P perpendicular to the scanning beam, and t is the thickness of the second disc region 113.
When the disk 110 is rotated by the driver 120, the scanning beam is periodically incident on the first disk region 112 and the second disk region 113, and the scanning beam is repeatedly deflected to Δ y1And Δ y2Equal two positions, at this time Δ y1And Δ y2The difference of (a):
Figure BDA0002590517800000072
since the disk 110 is disposed obliquely to the scanning beam at a fixed inclination angle, θ1And theta2Equal, the total amount of pixel shift can be adjusted as desired by the refractive index difference n1-n2(the value can be any value not less than 0), the thickness t and the angle theta1And theta2To be implemented. Namely: by controlling the thickness t and the angle theta1And theta2The scanning beam can be shifted by a preset shift amount.
When the scanning light beam is applied to a projection system, due to the fact that the offset of emergent light beams of the scanning light beam behind the first disc area 112 and the second disc area 113 is different, when the disc 110 rotates, the scanning light beam is periodically incident on the first disc area 112 and the second disc area 113, the two images are overlapped on a projection surface, an offset difference exists between the two images, due to the 'visual dwell effect' of a user, the image viewed by the user is overlapped by two image lights with preset pixel offset, a pixel offset effect is formed, and therefore pixel resolution can be improved.
Therefore, the light beam shifting apparatus 100 in this embodiment can achieve precise and quantitative shifting of the scanning light beam, and further improve the resolution, so that a higher resolution effect can be achieved on the premise of using a low-resolution DMD chip. The beam shifting apparatus 100 in the present embodiment can be applied to various types of projection systems. Since the optical beam shifting apparatus 100 of the present embodiment is applied, the disk 110 only needs to rotate in one direction (i.e. the axial direction of the driver 120) to achieve accurate pixel shifting, and thus, the installation and control are easier. Meanwhile, because only one degree of freedom of movement is provided, the driving mechanism for driving the beam shifting device 100 has lower power consumption and lower noise.
In other embodiments, when n1 ≠ n2, the thicknesses of the first disk region 112 and the second disk region 113 may not be desired, and the scanning beam may be accurately quantitatively shifted. In addition, although the embodiment shows the case where the disk 110 has two disk regions 111, it should be understood that the disk 110 may have three or more disk regions 111, and the refractive index of each disk region 111 may not be equal, and the thickness of each disk region 111 may be equal or may not be equal.
Second embodiment
Referring to fig. 4 and 5, the present embodiment provides another beam shifting apparatus 100, which is different from the beam shifting apparatus 100 provided in the first embodiment in that: in this embodiment, the thicknesses of the plurality of disk regions increase/decrease in the rotation direction, the refractive index of the first disk region 112 is equal to the refractive index of the second disk region 113, and the thickness of the first disk region 112 is not equal to the thickness of the second disk region 113.
Specifically, referring to fig. 4, in the present embodiment, the disc 110 includes a first disc region 112 and a second disc region 113, wherein the first disc region 112 has a thickness t1The second disc region 113 has a thickness t2And t is1≠t2And in particular, t1>t2. The first disk region 112 and the second disk region 113 may be made of the same material such that the refractive index of the first disk region 112 and the refractive index of the second disk region 113 are both n, n>n0。
Fig. 4 shows a state when the scanning beam is incident on the incident surface 114 of the first disk region 112, and referring to fig. 4, when the scanning beam is incident on the incident surface 114 of the first disk region 112:
Figure BDA0002590517800000091
wherein, Δ y1Is a predetermined offset, theta, between the scanning beam and the emergent ray1Is the angle between the plane of incidence 114 of the first disc region 112 with respect to a plane P perpendicular to the scanning beam, t1Is the thickness of the first disk region 112.
Fig. 5 shows a state when the scanning beam is incident on the incident surface 114 of the second disk region 113, and referring to fig. 5, when the scanning beam is incident on the incident surface 114 of the second disk region 113:
Figure BDA0002590517800000092
wherein, Δ y2Is a predetermined offset, theta, between the scanning beam and the emergent ray1Is the second disc areaThe angle, t, between the incident face 114 of the field 113 and the plane P perpendicular to the scanning beam2Is the thickness of the second disc region 113.
When the disk 110 is rotated by the driver 120, the scanning beam is periodically incident on the first disk region 112 and the second disk region 113, and the scanning beam is repeatedly deflected to Δ y1And Δ y2Equal two positions, at this time Δ y1And Δ y2The difference of (a):
Figure BDA0002590517800000093
since the disk 110 is disposed obliquely to the scanning beam at a fixed inclination angle, θ1The total amount of pixel shift can be adjusted as required to maintain the same refractive index difference t1-t2(the value can be any value not less than 0), refractive index n and angle theta1To be implemented.
When the scanning light beam is applied to a projection system, due to the fact that the offset of emergent light beams of the scanning light beam behind the first disc area 112 and the second disc area 113 is different, when the disc 110 rotates, the scanning light beam is periodically incident on the first disc area 112 and the second disc area 113, the two images are overlapped on a projection surface, an offset difference exists between the two images, due to the 'visual dwell effect' of a user, the image viewed by the user is overlapped by two image lights with preset pixel offset, a pixel offset effect is formed, and therefore pixel resolution can be improved.
Therefore, the light beam shifting apparatus 100 in this embodiment can achieve precise and quantitative shifting of the scanning light beam, and further improve the resolution, so that a higher resolution effect can be achieved on the premise of using a low-resolution DMD chip. The beam shifting apparatus 100 in the present embodiment can be applied to various types of projection systems. Since the optical beam shifting apparatus 100 of the present embodiment is applied, the disk 110 only needs to rotate in one direction (i.e. the axial direction of the driver 120) to achieve accurate pixel shifting, and thus, the installation and control are easier. Meanwhile, because only one degree of freedom of movement is provided, the driving mechanism for driving the beam shifting device 100 has lower power consumption and lower noise.
In this embodiment, the refractive index of the first disk region 112 and the refractive index of the second disk region 113 may be different, and in this case, the thickness t1 of the first disk region 112 and the thickness t2 of the second disk region 113 are adjusted simultaneously according to the determined refractive index of the first disk region 112 and the determined refractive index of the second disk region 113, so that the quantitative shift may be realized according to the determined Δ y value.
Third embodiment
Referring to fig. 6 and 7, the present embodiment provides another beam shifting apparatus 100, which is different from the beam shifting apparatus 100 of the first embodiment in that: in this embodiment, the inclination angles of the plurality of disk regions 111 are increased/decreased in the rotation direction. The incident surface 114 is used as a reflecting surface for reflecting the scanning beam, and when the scanning beam is incident to different disk areas 111, since the disk areas 111 have an area tilt angle in the rotation direction, the area tilt angle is an included angle between the incident surface 114 on the disk area 111 and the axial direction of the driver, and the area tilt angles of the disk areas 111 are not equal (increasing/decreasing) in the rotation direction, the reflection angles in different disk areas 111 are not equal. The same parts can refer to the related contents of the first embodiment, and are not described herein again.
Specifically, in the present embodiment, the incident surface 114 guides the scanning beam to emit in a reflective manner to form an emergent ray, and when the scanning beam is incident to different disk areas 111, because the reflection angles in the different disk areas 111 are not equal, the plurality of disk areas 111 sequentially shift the scanning beam by a preset shift amount in a rotation period when the different disk areas 111 are located on the optical path of the emergent ray.
Referring to FIG. 6, in one embodiment, the disk 110 includes a first disk region 112 and a second disk region 113, wherein an incident surface 114 of the first disk region 112 forms an angle θ with a plane P perpendicular to the scanning beam1(inclined to the first disk region 111Complementary angles) between the incident surface 114 of the second disk region 113 and a plane P perpendicular to the scanning beam is θ2(complementary to the zone tilt angle of the second disk zone 112), where θ1And theta2Not equal.
Fig. 6 shows a state where the scanning beam is incident on the incident surface 114 of the first disk region 112, and referring to fig. 6, when the scanning beam is incident on the incident surface 114 of the first disk region 112, the reflection angle of the outgoing ray is 2 θ1. FIG. 7 shows a state where the scanning beam is incident on the incident surface 114 of the second disk region 113, and referring to FIG. 7, when the scanning beam is incident on the incident surface 114 of the first disk region 112, the reflection angle of the outgoing ray is 2 θ2. By varying theta1And theta2And an appropriate imaging distance is selected such that the two imaging points are a certain distance apart, such as a distance of half a pixel, a distance of one pixel, etc.
In this embodiment, the incident surface 114 is disposed obliquely with respect to the axial direction of the driver 120, and since the inclination angles of the regions of the plurality of disk regions increase/decrease along the rotation direction, the inclination angles of the incident surfaces 114 of different disk regions 111 with respect to the axial direction of the driver 120 are not equal, and therefore the incident surfaces 114 of different disk regions 111 are not coplanar. In use, the scanning beam is incident on the incident surface 114 in a direction parallel to the axial direction of the driver 120, and this embodiment can make the whole pixel shifting device 100 more convenient to arrange in application.
Specifically, in the present embodiment, the thickness of each disk region 111 gradually increases along the radial direction of the driver 120, and the incident surface 114 is formed to be inclined toward the driver 120, so that when the scanning beam is incident on the incident surface 114, the emergent light beam is emitted toward the middle of the beam shifting device 100. Of course, it is understood that in other embodiments, the thickness of the disc region 111 may be gradually reduced along the radial direction of the driver 120, and the emergent light rays are emitted toward the outer side of the beam shifting apparatus 100.
When the scanning light beam is applied to a projection system, due to the fact that the offset of emergent light beams of the scanning light beam behind the first disc area 112 and the second disc area 113 is different, when the disc 110 rotates, the scanning light beam is periodically incident on the first disc area 112 and the second disc area 113, the two images are overlapped on a projection surface, an offset difference exists between the two images, due to the 'visual dwell effect' of a user, the image viewed by the user is overlapped by two image lights with preset pixel offset, a pixel offset effect is formed, and therefore pixel resolution can be improved.
In the present embodiment, the pass pair θ1And theta2Is appropriately sized, i.e. a pixel offset between the first and second disk regions 112, 113 can be achieved, and the pixel offset value between each other can be, for example, half a pixel. Since the optical beam shifting apparatus 100 of the present embodiment is applied, the disk 110 only needs to rotate in one direction (i.e. the axial direction of the driver 120) to achieve accurate pixel shifting, and thus, the installation and control are easier. Meanwhile, because only one degree of freedom of movement is provided, the driving mechanism for driving the beam shifting device 100 has lower power consumption and lower noise.
Fourth embodiment
Referring to fig. 8, the present embodiment provides a projection system 10, the projection system 10 includes a light emitting device 20, a beam shifting device 100 and a chip 30, wherein the light emitting device 20 is used for generating a scanning beam, and the light emitting device may be a laser light emitting device, a visible light emitting device, or an LED light emitting device lamp. The scanning beam is incident on the chip 30 and reflected to form a scanning beam, wherein the chip 30 may be a DMD chip. The structure of the beam shifting apparatus 100 can be seen from the first embodiment, which is located on the optical path of the scanning beam, and the incident surface 114 is used for receiving the scanning beam, and each disk area 111 has a certain inclination angle with respect to the scanning beam, and the scanning beam is guided to the subsequent optical path through the disk area 111 on the disk 110.
It will be appreciated that the projection system 10 may include more components than those shown in fig. 8, such as a body, a communication module, an interface, etc. Meanwhile, the beam shift device 100 may also be replaced with the beam shift device 100 in the second embodiment or the third embodiment.
In application, due to the fact that the offset of the emergent light beams of the scanning light beams behind the first disc area 112 and the second disc area 113 is different, when the disc 110 rotates, the scanning light beams are periodically incident on the disc areas 111 of the disc 110, for example, the scanning light beams are periodically incident on the first disc area 112 and the second disc area 113, an image formed on a projection plane can be overlapped with two images, and the two images have an offset difference.
The projection system 10 provided by the embodiment uses the beam shifting apparatus 100, so that the whole projection system 10 can realize the pixel expansion effect, improve the resolution, and reduce the manufacturing cost. Meanwhile, because the beam shifting device 100 has only one degree of freedom of movement, the noise and the increase of power consumption caused by the arrangement of the driving mechanism 40 are low.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A beam shifting apparatus, comprising:
a puck comprising a plurality of puck regions configured to have a tilt angle with respect to a scanning beam;
and the driver is connected with the disc and is used for driving the disc to rotate, the refractive indexes or thicknesses or the inclination angles of the areas of the disc are increased/decreased along the rotating direction, and the areas of the disc sequentially shift the scanning beam by preset shift amount in a rotating period.
2. The beam shifting apparatus of claim 1, wherein the scanning beam is refracted in the disk and then exits, and when the scanning beam is incident on different disk regions, refraction angles in different disk regions are not equal.
3. The beam shifting apparatus of claim 2, wherein the refractive indices of the plurality of disk regions increase/decrease in the rotational direction.
4. A beam shifting apparatus according to claim 3, wherein each of the disc regions has an equal thickness.
5. The beam shifting apparatus of claim 2, wherein the thickness of the plurality of disk regions increases/decreases in the rotational direction.
6. The beam shifting apparatus of claim 5, wherein each of the disk regions has the same refractive index.
7. The beam shifting apparatus of claim 1, wherein the scanning beam is reflected by the disk regions, and when the scanning beam is incident on the disk regions with different tilt angles, the reflection angles in different disk regions are not equal.
8. The beam shifting apparatus of claim 7, wherein each of the disk regions is disposed obliquely with respect to an axial direction of the driver, and a region inclination angle of the incident surface of the plurality of disk regions with respect to the axial direction of the driver increases/decreases in the rotational direction.
9. A reflective beam deflection apparatus according to claim 8, wherein the thickness of each of said disk regions increases gradually in a radial direction of said actuator.
10. A projection system, comprising:
a light emitting assembly for generating a scanning light beam; and
the beam shifting apparatus of any of claims 1-9, wherein the disk region is configured to have an oblique angle with respect to the scanning beam and to direct the scanning beam to a subsequent optical path.
CN202010694614.XA 2020-07-17 2020-07-17 Beam shifting device and projection system Pending CN113946046A (en)

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CN202010694614.XA CN113946046A (en) 2020-07-17 2020-07-17 Beam shifting device and projection system
PCT/CN2021/106671 WO2022012652A1 (en) 2020-07-17 2021-07-16 Light beam deviation device and projection system

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