CN116939174A

CN116939174A - Laser projection device

Info

Publication number: CN116939174A
Application number: CN202210334488.6A
Authority: CN
Inventors: 李晓平
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2022-03-30
Filing date: 2022-03-30
Publication date: 2023-10-24

Abstract

The application discloses laser projection equipment, and belongs to the field of projection display. Comprising the following steps: light source system, beam splitting component, LCOS, image processing device and projection lens. After the image processing device processes the image information input by one frame into at least two frames of image information to be displayed, the image processing device controls the plurality of driving circuits in at least two control modes based on the at least two frames of image information to be displayed, so that at least two frames of image light beams to be projected can be obtained after the illumination light beams are modulated through the plurality of pixel electrodes, and at least two frames of projection pictures corresponding to the at least two frames of image light beams to be projected have offset. Therefore, imaging pictures on the projection screens of at least two frames of projection pictures are not completely overlapped, and the at least two frames of projection pictures are equivalent to one frame of target picture by means of visual reaction of human eyes. Therefore, the resolution of the target picture is larger than that of each frame of projection picture, and the resolution of the laser display device is effectively improved.

Description

Laser projection device

Technical Field

The application relates to the field of projection display, in particular to laser projection equipment.

Background

The laser display projection technology is an emerging projection display technology, and the main advantages of the laser light source include high brightness, bright color and low energy consumption, so that the laser projection technology has the characteristics of high picture contrast and clear imaging, and therefore, the laser projection technology becomes the main stream development direction in the market.

Currently, laser projection devices generally include: laser light source, three liquid crystal silicon (English: liquid Crystal on Silicon; LCOS) (for example, red LCOS, green LCOS and blue LCOS), polarization beam splitter prism (English: polarization beamsplitter; PBS) group (including three PBS corresponding to three LCOS one by one respectively) and X-type color combining prism. The illumination beam emitted by the laser light source comprises red, green and blue laser. The three LCOS modulate the laser of different colors respectively and then guide the laser to the X-shaped color combining prism, and the X-shaped color combining prism combines the red, green and blue colors into white light and then projects the image onto a screen through a projection lens, so that the color display of the image is realized.

However, current laser projection devices are affected by factors such as the response speed of liquid crystal in LCOS and a driving circuit for driving a pixel electrode, resulting in lower resolution thereof.

Disclosure of Invention

The embodiment of the application provides laser projection equipment. The problem of lower resolution of laser projection equipment in the prior art can be solved, and the technical scheme is as follows:

in one aspect, there is provided a laser projection apparatus comprising:

the liquid crystal display comprises a light source system, a light splitting component, a liquid crystal silicon LCOS, an image processing device and a projection lens;

the LCOS includes: a plurality of pixel electrodes and a plurality of driving circuits which are arranged in an array, wherein the plurality of pixel electrodes are correspondingly and electrically connected with the plurality of driving circuits, and the plurality of driving circuits are electrically connected with the image processing device;

the light splitting assembly is used for guiding the illumination light beam provided by the light source system to the LCOS;

the image processing device is used for processing image information input by one frame into at least two frames of image information to be displayed, and sequentially controlling the driving circuits based on the at least two frames of image information to be displayed so as to modulate the illumination light beams through the pixel electrodes to obtain at least two frames of image light beams to be projected, wherein the at least two frames of image light beams correspond to the at least two frames of image information to be displayed one by one;

the beam splitting assembly is further used for guiding the at least two frames of image light beams to be projected to the projection lens in sequence;

the projection lens is used for projecting and imaging the image light beam;

and the at least two frames of projection pictures corresponding to the at least two frames of image light beams to be projected have offset.

The technical scheme provided by the embodiment of the application has the beneficial effects that at least:

a laser projection device, comprising: light source system, beam splitting component, LCOS, image processing device and projection lens. After the image processing device processes the image information input by one frame into at least two frames of image information to be displayed, the image processing device can respectively control the plurality of driving circuits in at least two control modes based on the at least two frames of image information to be displayed, so that at least two frames of image light beams to be projected can be obtained after the illumination light beams are modulated through the plurality of pixel electrodes, and at least two frames of projection pictures corresponding to the at least two frames of image light beams to be projected have offset. Therefore, imaging pictures on the projection screens of at least two frames of projection pictures are not completely overlapped, and the at least two frames of projection pictures can be equivalent to one frame of target picture by means of visual reaction of human eyes. Therefore, the resolution of the target picture is larger than that of each frame of projection picture, and the resolution of the laser display device is effectively improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a block diagram of a laser projection device according to an embodiment of the present application;

FIG. 2 is a schematic illustration of an LCOS structure according to an embodiment of the present application;

FIG. 3 is a schematic diagram of a pixel electrode driven by a driving circuit according to an embodiment of the present application during a modulation process of different image beams;

FIG. 4 is a schematic diagram showing the offset effects of the first projection screen and the second projection screen according to the embodiment of the present application;

FIG. 5 is a schematic diagram of a target frame according to an embodiment of the present application;

FIG. 6 is a block diagram of another laser projection device according to an embodiment of the present application;

FIG. 7 is a schematic diagram showing an offset effect of a third projection screen and a fourth projection screen according to an embodiment of the present application;

fig. 8 is a schematic diagram of a first projection screen, a second projection screen, a third projection screen and a fourth projection screen according to an embodiment of the present application.

Specific embodiments of the present application have been shown by way of the above drawings and will be described in more detail below. The drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but rather to illustrate the inventive concepts to those skilled in the art by reference to the specific embodiments.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 is a block diagram illustrating a laser projection apparatus according to an embodiment of the present application. The laser projection device may include: light source system 100, light splitting assembly 200, liquid crystal silicon (English: liquid Crystal on Silicon; LCOS) 300, image processing device 400, and projection lens 500.

For a clearer view of the structure of the LCOS, please refer to fig. 2, fig. 2 is a schematic diagram of the structure of the LCOS according to an embodiment of the present application. LCOS 300 in a laser projection device may include: a plurality of pixel electrodes 301 and a plurality of driving circuits 302 arranged in an array. The plurality of pixel electrodes 301 may be electrically connected to the plurality of driving circuits 302, and the plurality of driving circuits 302 may be electrically connected to the image processing apparatus 400. In the present application, in order to improve the resolution of the laser projection apparatus, the size of the pixel electrode 301 and the driving circuit 302 in the LCOS 300 needs to be reduced, but the size of the driving circuit 302 in the LCOS 300 cannot be reduced due to the influence of the current manufacturing process. Therefore, in the LCOS 300, at least two pixel electrodes 301 commonly share one driving circuit 302.

For example, one driving circuit 302 is shared for every four pixel electrodes 301, and this driving circuit 302 can drive four pixel electrodes 301 at the same time. For example, in fig. 2, the pixel electrode a, the pixel electrode b, the pixel electrode c, and the pixel electrode d may be simultaneously driven by one driving circuit a; the pixel electrode d, the pixel electrode e, the pixel electrode f, and the pixel electrode g may be driven by one driving circuit a at the same time. In this case, the resolution of the pixel electrode 301 in the LCOS 300 may be 4K, and the resolution of the driving circuit 302 in the LCOS 300 may be 2K. The 4K resolution refers to a resolution of 3840 pixels per line in the display screen, which is 3840×2160. The 2K resolution generally refers to 2048×1080 resolution.

The light splitting assembly 200 in a laser projection device may be used to direct an illumination beam provided by the light source system 100 to the LCOS 300. In the present application, the LCOS 300 may be used to modulate an illumination beam directed by the light source system 100 to the LCOS 300. For example, the LCOS used in the laser projection device is a monolithic LCOS. The display principle of LCOS is: the incident P polarized light irradiates on the LCOS chip, when the external voltage on two sides of a liquid crystal layer in the LCOS chip is 0 under the control of a driving circuit, the input P polarized light does not deflect through the polarization direction of the liquid crystal layer, reaches the bottom of the LCOS chip, and is reflected back to output the P polarized light, and the P polarized light returns along an original illumination light path. When external voltage exists on two sides of a liquid crystal layer in the LCOS chip, the input P polarized light deflects through the polarization direction of the liquid crystal layer, and reaches the bottom of the LCOS chip to reflect back to output S polarized light, and the laser beam modulated by the LCOS is imaged through a projection lens.

The image processing device 400 in the laser projection apparatus may be configured to process image information input by one frame into at least two frames of image information to be displayed, and sequentially control the plurality of driving circuits 302 based on the at least two frames of image information to be displayed, where the plurality of driving circuits 302 modulate the illumination light beams provided by the light source system 100 through the plurality of pixel electrodes 301, so as to obtain at least two frames of image light beams to be projected corresponding to the at least two frames of image information to be displayed one by one.

The beam splitting assembly 200 in the laser projection device may further be configured to sequentially guide at least two frames of image light beams to be projected, which are obtained by modulating the illumination light beams by the plurality of pixel electrodes 301, to the projection lens 500. Projection lens 500 may be used to project these image beams into an image.

And the at least two frames of projection pictures corresponding to the at least two frames of image light beams to be projected one by one are offset. The projection screen corresponding to one frame of image beam to be projected here means: the projection lens 500 is used to perform transmission imaging on the image beam to be projected.

In the embodiment of the present application, after the image processing apparatus 400 processes the image information input by one frame into at least two frames of image information to be displayed, the image processing apparatus 400 may control the plurality of driving circuits 302 in at least two control modes based on the at least two frames of image information to be displayed, respectively, so that at least two frames of image light beams to be projected can be obtained after modulating the illumination light beams by the plurality of pixel electrodes 301, and at least two frames of projection images corresponding to the at least two frames of image light beams to be projected have an offset. Therefore, imaging pictures on the projection screens of at least two frames of projection pictures are not completely overlapped, and the at least two frames of projection pictures can be equivalent to one frame of target picture by means of visual reaction of human eyes. Therefore, the resolution of the target picture is larger than that of each frame of projection picture, and the resolution of the laser display device is effectively improved. The target picture is a picture perceived by human eyes.

In summary, the embodiment of the present application provides a laser projection device, which may include: light source system, beam splitting component, LCOS, image processing device and projection lens. After the image processing device processes the image information input by one frame into at least two frames of image information to be displayed, the image processing device can respectively control the plurality of driving circuits in at least two control modes based on the at least two frames of image information to be displayed, so that at least two frames of image light beams to be projected can be obtained after the illumination light beams are modulated through the plurality of pixel electrodes, and at least two frames of projection pictures corresponding to the at least two frames of image light beams to be projected have offset. Therefore, imaging pictures on the projection screens of at least two frames of projection pictures are not completely overlapped, and the at least two frames of projection pictures can be equivalent to one frame of target picture by means of visual reaction of human eyes. Therefore, the resolution of the target picture is larger than that of each frame of projection picture, and the resolution of the laser display device is effectively improved.

Alternatively, at least two frames of graphic information to be displayed, which are obtained by processing the graphic information input by one frame by the image processing apparatus 400 in the laser projection device, may include: first image information and second image information. The image processing apparatus 400 may be configured to control each of the driving circuits 302 based on the first image information, and further modulate the illumination light beam provided to the light source system 100 by the plurality of pixel electrodes 301 into a first image light beam; the image processing device 400 may be further configured to control each driving circuit 302 based on the second image information, so as to modulate the illumination beam provided by the light source system 100 into the second image beam through the plurality of pixel electrodes 301. Wherein, in the process that the image processing device modulates the illumination light beam provided by the light source system into the first image light beam, at least part of the pixel electrode driven by each driving circuit is different from that in the process that the image processing device modulates the illumination light beam provided by the light source system into the second image light beam.

For example, referring to fig. 3, fig. 3 is a schematic diagram of a pixel electrode driven by a driving circuit in a process of modulating different image beams according to an embodiment of the present application. In the process of modulating the illumination light beam supplied from the light source system 100 into the first image light beam by the image processing apparatus 400, the driving circuit a may implement modulation of the illumination light beam by driving the pixel electrode a, the pixel electrode b, the pixel electrode c, and the pixel electrode d at the same time. In the process of modulating the illumination light beam provided by the light source system into the second image light beam by the image processing device, the driving circuit a can realize modulation of the illumination light beam by driving the pixel electrode d, the pixel electrode e, the pixel electrode f and the pixel electrode g at the same time. In this way, the pixel electrode a, the pixel electrode b, and the pixel electrode c driven by the driving circuit a in the process of modulating the illumination light beam into the first image light beam by the image processing apparatus are different from the pixel electrode e, the pixel electrode f, and the pixel electrode g driven by the driving circuit a in the process of modulating the illumination light beam into the second image light beam by the image processing apparatus. In this way, the pixels of the two frames of projection pictures are relatively shifted, so that the image pictures of the two frames of projection pictures on the projection screen are not completely overlapped.

In an embodiment of the present application, each driving circuit 302 in the LCOS 300 in the laser projection device is capable of driving four pixel electrodes 301 simultaneously. In the process of modulating the illumination light beam provided by the light source system 100 into the first image light beam by the image processing apparatus 400, and in the process of modulating the illumination light beam provided by the light source system 100 into the second image light beam by the image processing apparatus 400, each driving circuit 302 may simultaneously drive one common pixel electrode and three non-common pixel electrodes. For example, as shown in fig. 3, in the process of modulating the illumination light beam provided by the light source system 100 into the first image light beam by the image processing apparatus 400, the driving circuit a may drive three non-common pixel electrodes a, b and c, and one common pixel electrode d at the same time. In the process of modulating the illumination light beam supplied from the light source system 100 into the second image light beam by the image processing apparatus 400, the driving circuit a may simultaneously drive three non-common pixel electrodes e, f, and g, and one common pixel electrode d.

Optionally, referring to fig. 4, fig. 4 is a schematic diagram illustrating an offset effect of the first projection screen and the second projection screen according to an embodiment of the present application. The at least two frames of projection pictures corresponding to the at least two frames of image beams to be projected may include: a first projection screen P1 corresponding to the first image beam, and a second projection screen P2 corresponding to the second image beam. Wherein, the first projection screen P1 and the second projection screen P2 have a shift of one pixel in the first direction F1. For example, the first direction F1 may be a direction in which a diagonal line of one pixel is located. Therefore, after the first projection image P1 and the second projection image P2 are sequentially displayed on the projection screen, the first projection image P1 and the second projection image P2 can be equivalent to a frame of target image by means of visual reaction of human eyes. In this case, as shown in fig. 5, fig. 5 is a schematic diagram of a target screen according to an embodiment of the present application. When the first projection picture P1 and the second projection picture P2 have a pixel offset in the first direction F1, each pixel in the target picture can display a gray-scale picture by means of the visual response of human eyes. Thus, when the resolution of the first projection screen P1 and the second projection screen P2 is 2K, the resolution of the target screen can be 4K by means of the visual response of human eyes, so that the laser projection device can project a screen with 4K resolution.

It should be noted that, by adjusting the pixel electrode 301 driven by each driving circuit 302 in the LCOS 300 by the image processing apparatus 400, the first projection image P1 and the second projection image P2 may have a pixel offset in the first direction F1, so that the laser projection device presents a projection image with a resolution of 4K. But this first direction F1 refers to: since the direction of one diagonal line of one pixel is located, there is no problem of data loss in the pixels (black pixels in fig. 5, pixels corresponding to the pixel electrode a, the pixel electrode d, and the pixel electrode g in fig. 2) distributed along the first direction F1 in the target frame presented by the laser projection apparatus, and there is a possibility of data loss in the pixels (gray pixels in fig. 5, pixels corresponding to the pixel electrode c, the pixel electrode F, the pixel electrode b, and the pixel electrode e in fig. 2) distributed along the other diagonal line of one pixel in the target frame presented by the laser projection apparatus. Therefore, the embodiment of the application can realize the offset of the projection picture in the direction of the other diagonal line of one pixel through the vibrating mirror, so as to avoid the problem of data loss of the pixels distributed in the direction of the other diagonal line of one pixel in the target picture presented by the laser projection equipment, and further improve the display effect of the picture projected by the laser projection equipment. This will be described in detail in the following examples.

In an embodiment of the present application, please refer to fig. 6, fig. 6 is a block diagram of another laser projection apparatus according to an embodiment of the present application. The laser projection device may further include: galvanometer 600, galvanometer 600 may be positioned between beam splitting assembly 200 and projection lens 500. The at least two frames of graphic information to be displayed, which are obtained by processing the graphic information input by one frame by the image processing apparatus 400 in the laser projection device, may further include: third image information and fourth image information. The image processing apparatus 400 may be further configured to sequentially control the plurality of driving circuits 302 based on the third image information and the fourth image information, so as to sequentially modulate the illumination light beam provided by the light source system 100 into the third image light beam and the fourth image light beam through the plurality of pixel electrodes 301. By way of example, the image processing apparatus 400 may be configured to control each of the driving circuits 302 based on the third image information, thereby modulating the illumination light beam provided to the light source system 100 by the plurality of pixel electrodes 301 into a third image light beam; the image processing apparatus 400 may be further configured to control each of the driving circuits 302 based on fourth image information, so as to modulate an illumination beam provided to the light source system 100 into a fourth image beam through the plurality of pixel electrodes 301.

The galvanometer 600 disposed between the beam splitting assembly 200 and the projection lens 500 may be used to shift one of the third image beam and the fourth image beam modulated by the plurality of pixel electrodes 301 based on the third image information and the fourth image information, and then guide the shifted one to the projection lens 500, and the projection lens 500 is used to perform projection imaging on the third image beam and the fourth image beam. The offset processing refers to: after the third image beam and the fourth image beam are modulated by the image processing apparatus 400, the galvanometer 600 shifts one of the third image beam and the fourth image beam, so that two frames of projection pictures corresponding to the two frames of third image beam and the fourth image beam do not completely overlap with each other on the projection screen.

In the present application, as shown in fig. 6, the laser projection device may further include: the driving part 700 connected to the galvanometer 600 may be used to drive the galvanometer 600 to vibrate to shift the image beam, so that the resolution of the projection screen projected by the projection lens 500 can be improved. For example, the galvanometer 600 may be a piece of transparent glass, and the galvanometer 600 may vibrate at a high frequency under the driving of the driving part 700, so as to implement the offset processing of the projection screen.

Optionally, referring to fig. 7, fig. 7 is a schematic diagram illustrating an offset effect between a third projection screen and a fourth projection screen according to an embodiment of the present application. The at least two frames of projection pictures corresponding to the at least two frames of image beams to be projected may include: a third projection screen P3 corresponding to the third image beam, and a fourth projection screen P4 corresponding to the fourth image beam. Wherein the third projection screen P3 and the fourth projection screen P4 may have a shift of one pixel in the second direction F2. For example, the second direction F2 may be a direction in which another diagonal line of one pixel is located. Therefore, after the third projection screen P3 and the fourth projection screen P4 are sequentially displayed on the projection screen, the third projection screen P3 and the fourth projection screen P4 can be equivalent to a frame of target screen by the visual reaction of human eyes. In this case, when the third projection screen P3 and the fourth projection screen P4 are shifted by one pixel in the second direction F2, each pixel in the target screen can be made to exhibit a gray-scale screen display by the visual reaction of human eyes. Thus, when the resolution of the third projection screen P3 and the fourth projection screen P4 is 2K, the resolution of the target screen can be 4K by means of the visual response of human eyes, so that the laser projection device can project a screen with 4K resolution.

In the embodiment of the present application, as shown in fig. 4 and 7, the first projection screen P1 and the second projection screen P2 in at least two frames have a shift of one pixel in the first direction F1, and the third projection screen P3 and the fourth projection screen P4 in at least two frames have a shift of one pixel in the second direction F2. Wherein the first direction F1 and the second direction F2 intersect. The first direction F1 and the second direction F2 refer to directions in which two diagonal lines of one pixel are located, respectively. In this case, the first projection screen P1 and the second projection screen P2 have a pixel offset in the first direction F1, and the third projection screen P3 and the fourth projection screen P4 have a pixel offset in the second direction F2, so that the display effect of the screen projected by the laser projection apparatus can be ensured to be better on the premise of ensuring the higher resolution of the screen projected by the laser projection apparatus.

Alternatively, each driving circuit 302 may drive the same pixel electrode 301 in the process of modulating the illumination light beam supplied from the light source system 100 into the third image light beam by the image processing apparatus 400, and in the process of modulating the illumination light beam supplied from the light source system 100 into the fourth image light beam by the image processing apparatus 400.

In the embodiment of the present application, in the process of controlling the pixel electrode 301 by the image processing apparatus 400 to modulate the illumination light beam provided by the light source system 100 into the first image light beam by the driving circuit 302, each driving circuit 302 drives the same pixel electrode as in the process of controlling the pixel electrode 301 by the image processing apparatus 400 to modulate the illumination light beam provided by the light source system 100 into the third image light beam by the driving circuit 302.

For example, in the process of modulating the illumination light beam provided by the light source system 100 into the first image light beam by the image processing apparatus 400, the pixel electrode 301 driven by the driving circuit 302 may be the pixel electrode a, the pixel electrode b, the pixel electrode c, and the pixel electrode d. In the process of modulating the illumination light beam provided by the light source system 100 into the third image light beam by the image processing apparatus 400, the pixel electrode 301 driven by the driving circuit 302 may be the pixel electrode a, the pixel electrode b, the pixel electrode c, and the pixel electrode d.

In an embodiment of the present application, the galvanometer 600 located between the beam splitting assembly 200 and the projection lens 500 may be used to sequentially guide the first image beam, the second image beam, and the third image beam to the projection lens 500, and guide the fourth image beam to the projection lens 500 after performing the offset process. The projection lens 500 may be used to sequentially project the first, second, third, and fourth image beams into an image. As shown in fig. 8, fig. 8 is a schematic diagram of a first projection screen, a second projection screen, a third projection screen, and a fourth projection screen according to an embodiment of the present application. The first image beam, the second image beam, the third image beam and the fourth image beam may be sequentially projected and imaged by the projection lens 500, and then sequentially displayed on the projection screen: the first projection screen P1, the second projection screen P2, the third projection screen P3, and the fourth projection screen P4. The positions of the first projection picture P1 and the second projection picture P3 are the same, the first projection picture P1 and the second projection picture P2 have a deviation of one pixel along the first direction F1, and the third projection picture P3 and the fourth projection picture P4 have a deviation of one pixel along the second direction F2. By means of visual reaction of human eyes, the first projection picture P1, the second projection picture P2, the third projection picture P3 and the fourth projection picture P4 can be equivalent to a frame of target picture, and the pixels distributed along the first direction F1 in the frame of target picture can not have the problem of data loss, and the pixels distributed along the second direction F2 in the frame of target picture can not have the problem of data loss. Therefore, the resolution ratio of the projection picture projected by the laser projection equipment can be ensured to be higher, and the display effect is better.

In an embodiment of the present application, the light source system 100 may include: a laser, a combiner lens group and a mirror and light homogenizing assembly (not shown in the figures). The light combining lens group can be positioned at the light emitting side of the laser, and the arrangement direction of the light combining lens group and the laser can be perpendicular to the arrangement direction of the light combining lens group and the reflecting mirror. The laser can be used for sending out laser beams with three colors to the light converging lens group, and the light converging lens group can be used for guiding the laser beams with three colors to the reflecting mirror after converging. By way of example, three colors of laser light may include: blue laser, green laser, and red laser. In the embodiments of the present application, three laser beams of blue, green and red are emitted simultaneously by a laser.

The reflecting mirror in the light source system can be used for guiding the laser beam after light combination to the light homogenizing component, and the light homogenizing component can be used for homogenizing the laser beam after light combination and guiding the laser beam after light homogenization to the light splitting component. The beam splitting assembly can be used for guiding the laser beam after the light is homogenized to the LCOS, and the LCOS can be used for modulating the laser beam after the light is homogenized by the light homogenizing assembly.

Optionally, the beam splitting component in the laser projection device may include: a first right angle prism, a second right angle prism, and a beam splitting medium film (not shown) between the inclined surface of the first right angle prism and the inclined surface of the second right angle prism. The first right-angle prism can be closer to the light homogenizing component relative to the second right-angle prism, and the inclined plane of the second right-angle prism faces the light emitting surface of the LCOS and faces the light homogenizing component. In this case, the light-emitting surface A1 of the LCOS can be blocked by the first right-angle prism and the second right-angle prism, so as to prevent dust in the outside from adhering to the light-emitting surface of the LCOS, and further improve the quality of the image projected by the laser projection device. For example, the first right-angle prism and the second right-angle prism may be high-precision right-angle prisms, the inclined surfaces of the first right-angle prism and the second right-angle prism are glued, and the inclined surface of one right-angle prism is plated with a polarization beam splitting medium film. Thus, a polarization beam splitter PBS can be formed.

For example, the polarization splitting prism may allow incident P-polarized light to be reflected at an exit angle of 45 degrees while passing incident S-polarized light completely therethrough, with the polarization direction of the S-polarized light being perpendicular to the polarization direction of the P-polarized light. For example, P polarized light in the laser beam after the light is homogenized by the light homogenizing component is reflected to the LCOS through the light splitting medium film between the first right angle prism and the second right angle prism, the LCOS modulates the P polarized light to form S polarized light, then the S polarized light reflected from the LCOS is reflected, and the S polarized light is transmitted to the projection lens through the polarization light splitting prism. It should be noted that, the polarization beam splitter PBS may also reflect S polarized light and transmit P polarized light, which is not particularly limited in the embodiment of the present application.

The projection lens in the laser projection device may have a plurality of optical lenses (not shown) that may be used to project the LCOS-modulated laser beam into an image.

In the present disclosure, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" refers to two or more, unless explicitly defined otherwise.

The foregoing description of the preferred embodiments of the present application is not intended to limit the application, but is intended to cover all modifications, equivalents, alternatives, and improvements falling within the spirit and principles of the application.

Claims

1. A laser projection device, comprising: the liquid crystal display comprises a light source system, a light splitting component, a liquid crystal silicon LCOS, an image processing device and a projection lens;

the projection lens is used for projecting and imaging the image light beam;

and the at least two frames of projection pictures corresponding to the at least two frames of image light beams to be projected one by one have offset.

2. The laser projection device of claim 1, wherein the at least two frames of image information to be displayed comprise: first image information and second image information;

the image processing means is for controlling each of the driving circuits based on the first image information to modulate the illumination light beam into a first image light beam through the plurality of pixel electrodes;

the image processing device is further configured to control each of the driving circuits based on the second image information to modulate the illumination light beam into a second image light beam through the plurality of pixel electrodes;

wherein at least a portion of the pixel electrodes driven by each of the driving circuits are different in the process of modulating the illumination light beam into the first image light beam from the process of modulating the illumination light beam into the second image light beam.

3. The laser projection device of claim 2, wherein each of the driving circuits in the LCOS is capable of driving four pixel electrodes simultaneously;

each of the driving circuits drives one common pixel electrode and three non-common pixel electrodes simultaneously in the process of modulating the illumination light beam into the first image light beam and in the process of modulating the illumination light beam into the second image light beam.

4. A laser projection device as claimed in claim 3, wherein the at least two frames of projection pictures comprise: a first projection screen corresponding to the first image beam, and a second projection screen corresponding to the second image beam;

wherein, the first projection picture and the second projection picture have one pixel offset in a first direction.

5. The laser projection device of any of claims 2 to 4, wherein the laser projection device further comprises: a galvanometer positioned between the beam splitting component and the projection lens;

the at least two frames of image information to be displayed further include: third image information and fourth image information;

the image processing device is further used for controlling the plurality of driving circuits based on third image information and the fourth image information in sequence so as to modulate the illumination light beams into the third image light beams and the fourth image light beams through the plurality of pixel electrodes in sequence;

the galvanometer is used for guiding one of the third image beam and the fourth image beam to the projection lens after performing offset processing.

6. The laser projection device of claim 5, wherein the at least two frames of projection pictures further comprise: a third projection screen corresponding to the third image beam, and a fourth projection screen corresponding to the fourth image beam;

wherein, the third projection picture and the fourth projection picture have a pixel offset in the second direction.

7. The laser projection device of claim 6, wherein a first projection frame and a second projection frame of the at least two frame projection frames are offset by one pixel in a first direction, the first direction intersecting the second direction.

8. The laser projection device as claimed in claim 5, wherein each of the driving circuits drives the same pixel electrode in the process of modulating the illumination beam into the third image beam and in the process of modulating the illumination beam into the fourth image beam.

9. The laser projection device as claimed in claim 8, wherein each of the driving circuits drives the same pixel electrode in the process of modulating the illumination beam into the first image beam and in the process of modulating the illumination beam into the third image beam;

the galvanometer is used for guiding the first image light beam, the second image light beam and the third image light beam to the projection lens in sequence, and guiding the fourth image light beam to the projection lens after offset processing.

10. The laser projection device of claim 1, wherein the resolution of the pixel electrode in the LCOS is 4K and the resolution of the driving circuit in the LCOS is 2K.