WO2022002190A1

WO2022002190A1 - Video signal processing system and method, projection system, and projection method

Info

Publication number: WO2022002190A1
Application number: PCT/CN2021/103961
Authority: WO
Inventors: 余新; 胡飞; 陈晨; 弓殷强; 李屹
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2020-07-03
Filing date: 2021-07-01
Publication date: 2022-01-06
Also published as: CN113888565A

Abstract

A video signal processing system and method, a projection system, and a projection method. The video signal processing system (100) comprises an image processing unit (110), wherein the image processing unit (110) is used for segmenting each frame of color image into M monochromatic light images, combining the monochromatic light images of the same color that are obtained by means of segmentation to form at least one monochromatic image frame, and outputting each monochromatic image frame to a DLP projection apparatus (200). A color image is segmented to form monochromatic light images; the monochromatic light images of the same color are then combined to form at least one monochromatic image frame; the monochromatic image frames are transmitted to a DLP projection apparatus (200) for guidance; and finally, same are subjected to light combination by means of a light combination element (300) and are then emitted. Since each monochromatic image frame is formed by combining a plurality of monochromatic light images, a monochromatic image frame comprises a plurality of monochromatic light images of the same color, which is equivalent to being formed by a plurality of frames of monochromatic light images, and therefore, the frame rate of each monochromatic image frame is improved relative to an original color image.

Description

Video signal processing system, method, projection system and projection method

technical field

The present application relates to the technical field of projection, and in particular, to a video signal processing system, method, projection system and projection method.

Background technique

In recent years, in order to cope with the limited application of liquid crystal display (LCD) technology, the highlight display system based on Digital Light Processing (DLP) technology has been continuously developed. The core of DLP projection display method is to provide a spatial light modulation Unit, digital microlens device (DMD) as a reflective spatial light modulator occupies a very important position in the field of projection applications. Compared with the transmissive LCD, the reflective DMD system has more advantages in heat dissipation, so it is extremely beneficial to the development of a high-brightness projection system.

When using DMD to display, the states of a single microlens are only "on" and "off". Therefore, in order to display pictures with different grayscales, it is necessary to use PWM modulation to quickly switch the on and off states. The switching speed of the digital micromirror between on and off determines the final grayscale fineness that can be displayed, that is, the bit depth of the color.

In a DLP device, the use of DMD for projection display is mainly a solution of three DMDs, that is, a DLP projection system contains three DMDs, and a set of light splitting system is used to split the input white light, so that each DMD only has It is responsible for the modulation of a color, and then after combining light and lens magnification, it is finally displayed on the screen. Using multiple DMDs can obtain multiple bandwidths, so it can display higher frame rates without sacrificing bit depth. image, but the cost of the three-piece DMD solution is very high, which is not conducive to promotion.

SUMMARY OF THE INVENTION

The purpose of the present application is to provide a video signal processing system, method, projection system and projection method to improve the above technical problems.

In a first aspect, an embodiment of the present application provides a video signal processing system, which is applied to a projection system. The video signal processing system includes: an image processing unit, and the image processing unit is configured to divide each frame of color image into M monochromatic lights image, and combine the segmented monochromatic light images of the same color to form at least one monochromatic image frame, the image processing unit is also used to output the monochromatic image frame to the DLP projection device, wherein M is greater than or equal to 3 positive integer of .

In some embodiments, the projection system includes M DLP projection devices, and the image processing unit is configured to output different monochrome image frames to different DLP projection devices.

In some embodiments, the image processing unit is specifically configured to: divide consecutive M frames of color images into groups, divide each image frame in each group into a plurality of monochromatic light images, and divide the separated images of the same color into groups. Monochromatic light images are combined in image frame order to form a monochrome image frame.

In some embodiments, the durations corresponding to each monochromatic light image are equal.

In some embodiments, the image processing unit is configured to divide each frame of the color image into M monochromatic light images, and combine the divided monochromatic light images of the same color to form at least one monochromatic image frame and at least one mixed-color image frame, the image processing unit is further configured to output the single-color image frame and the mixed-color image frame to the DLP projection device.

In some embodiments, each monochrome image frame and each mixed-color image frame have equal durations.

In a second aspect, an embodiment of the present application further provides a video image processing method, which is applied to a projection system, where the projection system includes a DLP projection device, and the method includes: dividing each frame in a color image into M monochromatic light images, wherein M is a positive integer greater than or equal to 3; the segmented monochromatic light images of the same color are combined to form at least one monochromatic image frame; the monochromatic image frame is output to the DLP projection device.

In some embodiments, dividing each frame of the consecutive M frames of color images into M monochromatic light images includes: dividing the consecutive M frames of color images into groups; dividing each frame of the image in each group into a plurality of monochromatic light images; the separated monochromatic light images of the same color are combined according to the image sequence to form a monochromatic image frame.

In a third aspect, an embodiment of the present application further provides a projection system, including the above-mentioned video signal processing system, a DLP projection device, and a light combining element. The DLP projection device includes a controller and a digital micro-lens. The controller receives a single-color image frame output by the signal processing system, drives the digital micro-lens in time series, and guides the digital micro-lens to the light combining element. The light combining element is used for combining the light rays of a plurality of monochromatic image frames and then outputting them to a subsequent light path.

In a fourth aspect, an embodiment of the present application further provides a projection method, which is applied to the above-mentioned projection system. The projection method includes: dividing each frame in a color image into M monochromatic light images; The monochromatic light images are combined to form at least one monochromatic image frame; the monochromatic image frame is output to the DLP projection device, the DLP projection device includes a controller and a digital microlens, the controller receives the monochromatic image frame, and drives the timing sequence a digital microlens; and combine the light rays of a plurality of monochromatic image frames and then emit the light to a subsequent light path.

The video signal processing system, method, projection system and projection method provided by the present application form a monochromatic light image by dividing each frame in a color image, and then combine the divided monochromatic light images of the same color to form At least one single-color image frame, and the single-color image frame is transmitted to the DLP projection device for guidance, and finally the light is combined by the light combining element and then emitted. Since each monochromatic image frame is formed by the combination of multiple monochromatic light images, a monochromatic image frame includes multiple monochromatic light images of the same color, which is equivalent to being formed by multiple frames of monochromatic light images, so its The frame rate is improved relative to the original color image.

These and other aspects of the present application will be more clearly understood in the description of the following embodiments.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic structural diagram of a projection system shown in the present application;

FIG. 2 is a schematic flow chart of the projection system shown in FIG. 1 during display;

3 is a schematic structural diagram of another projection system shown in the present application;

4 is a structural block diagram of a video signal processing system provided in the first embodiment;

5 is a flowchart of a video signal processing method provided in the first embodiment;

6 is a schematic flowchart of image segmentation in the video signal processing method provided in the first embodiment;

7 is a schematic flowchart of another image segmentation in the video signal processing method provided in the first embodiment;

8 is a schematic flowchart of image segmentation performed by the video signal processing system provided in the second embodiment;

9 is a flowchart of a video signal processing method provided in the second embodiment;

10 is a schematic structural diagram of a projection system provided by a third embodiment of the present application;

11 is a structural block diagram of a DLP projection apparatus provided by the third embodiment of the present application;

FIG. 12 is a flowchart of a projection method provided in the third embodiment.

detailed description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

Referring to FIG. 1, in some projection systems 1a, a DLP projection device 3 is included, and the DLP projection device 3 includes a DMD device 4. After the signal source is processed by the image processing unit 2, it is displayed by the same DLP projection device 3 according to the time sequence. , and project to screen 5. Referring to FIG. 2 , when each frame of image is displayed, it is displayed according to a preset time sequence. For example: in the period T of a frame of image, the image light of red, blue and green is included. When displaying, the red image light is displayed in the first 1/3 period, and the red image light is displayed in the second 1/3 period. , showing green image light, and in the last 1/3 period, showing blue image light. Of course, the display order can be adjusted as needed.

This kind of projection system 1a needs to use the visual persistence effect of the human eye when displaying, and divide the duration of one frame into three or more parts, and assign them to different colors for time-sharing display. In order to display a color image with a certain number of bits, it is necessary to ensure that the mirror is turned over fast enough to provide a large enough bandwidth. For example, for a single DLP system, the flip speed can be guaranteed to reach a frame rate of 120 Hz with a bit depth of 8 bits. However, if you want to increase the frame rate of the image on this basis, you need to sacrifice a part of the bit depth.

As shown in FIG. 3 , in some ways, the projection device 1b includes a multi-chip DMD device, and after the image processing unit 2 processes the image signal, it is sent to the multiple DMD devices 4 of the same DLP projection device 3 according to the three primary color lights. Guide, and project to screen 5 after combining light. The disadvantage of this method is that the DLP projection device 3 including the multi-chip DMD device 4 is expensive and the cost is extremely high.

Therefore, the inventor of the present application proposes a video signal processing system, method, projection system and projection method, which can improve the image display frame rate without changing the bit depth. The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

first embodiment

Referring to FIG. 4 , this embodiment provides a video signal processing system 100 , which can be applied to the projection system 10 shown in FIG. 7 , wherein the projection system 10 includes M DLP projection apparatuses 200 , and each DLP projection apparatus 200 includes a monolithic DMD device. Specifically, the video signal processing system 100 includes an image processing unit 110 .

The image processing unit 110 is configured to divide each frame in the color image into M monochromatic light images, and combine the divided monochromatic light images of the same color to form at least one monochromatic image frame, where M is greater than or a positive integer equal to 3. The color image does not specifically mean that the video signal image is color, but refers to that the video signal image is composed of a plurality of primary color images, and the frame rate of the color image is the first frame rate.

In some embodiments, the M monochromatic light images divided into each frame in the color image may all be combined according to different colors to form M monochromatic image frames. In some embodiments, part of the monochromatic light images may form a monochromatic image frame, and the remaining monochromatic light images may form a mixed color image frame.

Each frame of color image can be divided into M monochromatic light images, and the time duration corresponding to each monochromatic light image is equal. And as an example, the colors of the M monochromatic light images into which each frame of color image is split are corresponding to each other. For example: the first frame of color image is divided into three colors of red, green and blue monochromatic light images, correspondingly, the second and third frame of color images are also divided into three kinds of red, green and blue. Color monochromatic light image.

Just as an example, in this embodiment, M is equal to 3, and each frame of color image is divided into monochromatic light images of three primary colors of red, green, and blue. The advantage of this arrangement is that, since the light source usually adopts three primary color light sources, it is also more convenient to implement a monochromatic light image that is divided into three primary colors.

Meanwhile, in this embodiment, the image processing unit 110 combines all the monochromatic light images of the same color to form a monochromatic image frame, wherein the duration corresponding to each monochromatic light image is 1/M of the duration corresponding to one frame of color image, During the display process, the monochromatic image frame formed by the combination of monochromatic light images of the same color includes one or more monochromatic light images. One monochromatic light image actually forms a frame, so its frame rate is not 1/M of the original color image.

In some embodiments, the image processing unit is configured to divide consecutive M frames in the color image, and each frame is divided to form M monochromatic image lights, that is, to form M*M monochromatic image lights, each monochromatic image The frame includes a monochromatic light image split from M consecutive image frames. Therefore, it is equivalent to combining the monochromatic light images of the original M frames of images within a monochromatic image frame period T, so the equivalent period of the image frame is (1/M)T, that is, the frame of the monochromatic image frame The second frame rate is M times the first frame rate, that is, the frame rate is M times that of the single DMD system shown in FIG. 1 .

The image processing unit 110 is further configured to output the monochrome image frame to the DLP projection apparatus 200. In this embodiment, a projection system 10 includes M DLP projection apparatuses 200, and the image processing unit 110 can combine the M monochrome image frames formed by The image frames are respectively output to different projection apparatuses 200 , where different DLP projection apparatuses 200 refer to M DLP projection apparatuses 200 in the projection system 10 . That is, send the monochrome image frame formed by the combination of each red image light to a DLP projection device 200, send the monochrome image frame formed by the combination of each blue image light to a DLP projection device 200, and combine each green image light The resulting monochrome image frame is sent to a DLP projection device 200 .

In some other embodiments, a projection system 10 may also include only one projection device 200. In this case, when the image processing unit 110 outputs the M monochrome image frames to the projection device 200, it may The M monochrome image frames are output to the projection device 200 in sequence, and the projection device 200 drives and displays the M monochrome image frames in accordance with the time sequence. Due to the persistence of vision effect, the user can still view normal images.

In other embodiments, a projection system 10 may also include more than one and less than M projection apparatuses 200 . In this case, when the image processing unit 110 outputs M monochrome image frames to the projection apparatus 200 , the M monochrome image frames may be sent to different projection apparatuses 200 in an evenly distributed manner according to a preset time sequence, so that the display durations of each projection apparatus 200 are equal.

The image processing unit 110 may be composed of one or more processors, and each processor may include one or more processing cores. The processor can be implemented in at least one hardware form among digital signal processing (Digital Signal Processing, DSP), field programmable gate array (Field-Programmable Gate Array, FPGA), and programmable logic array (Programmable Logic Array, PLA). . The processor may integrate one or a combination of a central processing unit (Central Processing Unit, CPU), a graphics processor (Graphics Processing Unit, GPU), a modem, and the like.

The video signal processing system 100 provided in this embodiment can process a color image, divide each frame in the color image to form a monochromatic light image, and then combine the divided monochromatic light images of the same color to form a monochromatic light image The image frame is sent to the DLP projection device 200 for display, thereby increasing the display frame rate, and at the same time, because it is adapted to a single-chip DMD system, the cost is low.

Referring to FIG. 5 , this embodiment further provides a video signal processing method, which can be applied to the above-mentioned video signal processing system 100 , or the projection system 10 shown in FIG. 7 , wherein the projection system 10 includes M DLP projection device 200 .

Specifically, the video signal processing method includes the following steps:

Step S110: Divide each frame of the color image into M monochromatic light images. M is a positive integer greater than or equal to 3, and M is 3 in this embodiment.

Among them, the number and color of M monochromatic light images generated by each frame of color image segmentation are the same, and the corresponding time lengths of each monochromatic light image are equal, which are the time corresponding to 1/M color images. T _1.

In some embodiments, step S110 may be performed in the following manner: dividing consecutive M frames of color images into groups, and dividing each image frame in each group into a plurality of monochromatic light images. That is, firstly, group consecutive M frames of images, and then perform image segmentation according to the grouping, and combine the segmented monochrome image lights in the same group to form a monochrome image frame. This avoids compositional bias when doing image segmentation and recombination. At the same time, in the subsequent step S130, when the monochrome image frame is transmitted, it can be ensured that the output sequence of the monochrome image frame corresponds to the sequence of the video signal.

Step S120: Combine the segmented monochromatic light images of the same color to form at least one monochromatic image frame.

Referring to FIG. 6 , when combining, the combination is performed according to the time sequence to form a monochrome image frame, and when combining, the combination is performed in the following manner:

The three monochromatic light images generated after the first frame of color image segmentation are M11, M12, and M13, respectively, the three monochromatic light images generated after the second frame of color image segmentation are M21, M22, and M23, respectively. The three monochromatic light images generated after image segmentation are M31, M32, and M33, respectively, where M11, M21, and M31 are the same color, M12, M22, and M32 are the same color, and M13, M23, and M33 are the same color. The time durations corresponding to each monochromatic light image are all the same.

When combining, combine into a monochrome image frame in the order of M11, M21 and M31, combine into a monochrome image frame in the order of M12, M22 and M32, combine into a monochrome image frame in the order of M13, M23 and M33 image frame. In this way, when three monochrome image frames are sent to the DLP projection device 200 and displayed, M11, M12, and M13 can be displayed synchronously, M21, M22, and M23 can be displayed synchronously, and M31, M32, and M33 can be displayed synchronously. , the original video image signal will not be distorted.

Step S130 : output the monochrome image frames to the DLP projection device 200 respectively.

In this embodiment, the number of DLP projection apparatuses 200 is 3, which is the same as M, so the formed 3 monochrome image frames can be output to different DLP projection apparatuses 200, and the monochrome image frames of the same color are output according to the corresponding time sequence to the same DLP projection device 200 .

It can be understood that, in other embodiments, when the number of DLP projection devices is not three, for example, when the number of DLP projection devices is one, three monochrome image frames can be output to one DLP projection device 200, And drive the display according to the preset timing.

As another implementation manner, M can also be a positive integer greater than 3, for example, M can be equal to 4, 5, etc. The following is an example of M being 4:

Referring to FIG. 7 , when M is equal to 4, each frame in the color image can be divided into 4 monochromatic light images, which can include, for example, red, green, blue, and white. It can be understood that when M is 5 or a positive integer greater than 5, each frame in the color image can be divided to form M monochromatic light images, for example, can include at least one red, at least one green, at least one blue, etc. .

Divide the continuous 4 frames of color images. The 4 monochromatic light images generated by the segmentation of the first frame of color images are M11, M12, M13, and M14 respectively, and the 4 monochromatic light images generated by the segmentation of the second frame of color images. They are M21, M22, M23, and M24, respectively. The 4 monochromatic light images generated after the third frame of color image segmentation are M31, M32, M33, and M34, respectively, and the 4 monochromatic light images generated after the fourth frame of color image segmentation are generated. They are M41, M42, M43, and M44 respectively, among which M11, M21, M31 and M41 are the same color, M12, M22, M32 and M42 are the same color, M13, M23, M33 and M43 are the same color, M14, M24, M34 and M44 in the same color.

When combining, it can be done in the following way: combine the order of M11, M21, M31 and M41 into a monochrome image frame, combine the order of M12, M22, M32 and M42 into a monochrome image frame, M13, M23 The sequence of , M33 and M43 is combined into a single-color image frame, and the sequence of M14, M24, M34 and M44 is combined into a single-color image frame. When four monochromatic image frames are sent to the DLP projection device 200 and displayed, especially when they are sent to different DLP projection devices respectively, M11, M12, M13, M14 can be displayed synchronously, M21, M22, M23, M24 can be displayed synchronously, M31, M32, M33, M34 can be displayed synchronously, M41, M42, M43, M44 can be displayed synchronously, and the original video image signal will not be distorted.

In some embodiments, the monochromatic image frame composed of M12, M22, M32 and M42 and the monochromatic image frame composed of the sequence of M13, M23, M33 and M43 can also be output to a DLP projection device at this time. Carry out, send the monochromatic image frame formed by the combination of M13, M23, M33 and M43, and the monochromatic image frame formed by the combination of M14, M24, M34 and M44 to a DLP projection device for display. At this time, only two DLP projection devices are needed to achieve synchronized display.

The video signal processing method provided in this embodiment can process each frame in the color image, divide each frame in the color image into monochromatic light images, and then divide the divided monochromatic light images of the same color A single-color image frame is formed by combining, and is sent to the DLP projection device 200 for display, thereby increasing the display frame rate, and at the same time, the cost is low due to the adaptation to a single-chip DMD system.

Second Embodiment

In one embodiment, please refer to FIG. 4 and FIG. 8 together. FIG. 8 shows another implementation manner of the video signal processing system 100. The video signal system 100 includes an image processing unit 110, and the image processing unit 110 is used to Each frame in the color image is divided into M monochromatic light images, and the divided monochromatic light images of the same color are combined to form at least one monochromatic image frame and at least one mixed color image frame. The image processing unit 110 further Used to output monochrome image frames and mixed color image frames to the DLP projection device.

Wherein, the monochromatic image frame contains only one color monochromatic light image, and the mixed color image frame contains at least two color monochromatic light images. In this embodiment, taking M as 3 as an example, each frame in the color image is divided into 3 monochromatic light images, and the 3 divided monochromatic light images are combined to form a monochromatic image frame and a mixed color image frame, mixed color image The frame contains a monochromatic light image of two colors.

Please continue to refer to FIG. 8. Specifically, when combining, a single-color image frame and a mixed-color image frame are combined according to the time sequence. When combining, the combination is performed in the following manner:

The three monochromatic light images generated after the first frame of color image segmentation are M11, M12, and M13, respectively, the three monochromatic light images generated after the second frame of color image segmentation are M21, M22, and M23, respectively. The three monochromatic light images generated after image segmentation are M31, M32, and M33, of which M11, M21, and M31 are the same color, M12, M22, and M32 are the same color, and M13, M23, and M33 are the same color.

When combining, three single-color image frames are combined in the order of M11, M21 and M31, and three mixed-color image frames are combined in the order of M12 and M13, M22 and M23, and M32 and M33. The duration corresponding to the image frame is equal to the duration corresponding to each mixed color image frame. That is, a single-color image frame composed of M11 has the same duration as a mixed-color image frame composed of M12 and M13; a single-color image frame composed of M21 corresponds to a color-mixing image frame composed of M22 and M23. A single-color image frame has the same duration as a mixed-color image frame composed of M32 and M33.

In this way, when three monochrome image frames are sent to one DLP projection device 200 and displayed, M11, M12, and M13 can be displayed synchronously, and when three mixed color image frames are sent to one DLP projection device 200 and displayed, M12 The mixed color image frame formed with M13 can be displayed synchronously with the monochrome image frame formed by M11. Similarly, the mixed color image frame formed by M22 and M23 can be displayed synchronously with the monochrome image frame formed by M21. The mixed color image frame formed by M32 and M33 can be displayed synchronously. It can be displayed in synchronization with the monochrome image frame formed by the M31.

The duration corresponding to each monochrome image frame is equivalent to 2/3 of each frame in the color image, so the frame rate is improved compared to the original color image. At the same time, since only two single-chip DLP devices need to be used, the production cost is reduced.

It should be noted that the color of each monochromatic light image in this embodiment is not limited, and the color of the monochromatic light image contained in the mixed color image frame is also not limited. When M is greater than 3, the number of single-color image frames and the number of mixed-color image frames can be selectively greater than 1, and the number of single-color light images included in each color-mixed image frame can also be greater than 2.

The video signal processing system 100 provided in this embodiment can process a color image, divide each frame in the color image to form a monochromatic light image, and then combine the divided monochromatic light images of the same color to form a single color image. The color image frame and the mixed color image frame are sent to the DLP projection device 200 for display, thereby improving the display frame rate, and at the same time, the cost is low due to the adaptation to the single-chip DMD system.

Referring to FIG. 9, this embodiment also provides a video signal processing method, including the following steps:

Step S210: Divide each frame of the color image into M monochromatic light images. M is a positive integer greater than or equal to 3, and M is 3 in this embodiment.

Step S220: Combine the segmented monochromatic light images of the same color to form at least one monochromatic image frame and at least one mixed color image frame. In this embodiment, the combination forms a single-color image frame and a mixed-color image frame.

Step S230 : output the monochrome image frame and the mixed-color image frame to different DLP projection apparatuses 200 respectively.

For the specific implementation manner of each step, please refer to the foregoing content. The video signal processing method provided in this embodiment can process each frame of a color image, divide each frame of the color image into monochromatic light images, and then divide the divided monochromatic light images of the same color into A single-color image frame is formed by combining, and is sent to the DLP projection device 200 for display, thereby increasing the display frame rate, and at the same time, the cost is low due to the adaptation to a single-chip DMD system.

Third Embodiment

Referring to FIG. 10 , this embodiment provides a projection system 10 . The projection system 10 includes a video signal processing system 100 , a DLP projection apparatus 200 and a light combining element 300 . The video signal processing system 100 is used to process the input video signal and output it to the DLP projection apparatus 200 , and the light combining element 300 is used to perform light combining processing on the light guided by different DLP projection apparatuses 200 .

For the structure, function or implementation of the video signal processing system 100, reference may be made to the relevant content of the first embodiment, which will not be repeated here.

In this embodiment, the number of DLP projection apparatuses 200 is M, and each DLP projection apparatus 200 is a single-chip DLP projection apparatus 200. Specifically, referring to FIG. 11 , each DLP projection device 200 includes a controller 220 and a digital microlens 210 (DMD device). The controller 220 receives a monochrome image frame output by the signal processing system, and drives the digital microlens in time series. Monochromatic image frames are displayed at 210 and directed to light combining element 300 . It should be noted that each DLP projection apparatus 200 may further include a light source 230, which may be a laser light source, a fluorescent light source, or the like, for emitting light so that the digital microlens 210 displays.

The light combining element 300 receives the light of each single-color image frame guided by the DLP projection device 200 , combines the light and emits it to the subsequent optical path, and the frame rate of the combined image signal is also the second frame rate. In some embodiments, the light combining element 300 may be a wavelength combining element 300, that is, the light combining element 300 is divided into a plurality of regions by utilizing the characteristics of different wavelengths of red light, blue light and green light, and each region only selects Through the light of one color, the operation of combining light is realized. In some other embodiments, the light combining element 300 may also be a polarization state light combining element 300, and the light combining element 300 is divided into a plurality of regions, and each region only selectively transmits light of one polarization state to achieve Synthetic operation.

The working principle of the projection system 10 provided in this embodiment is as follows:

When the video signal is input to the video processing system, the video signal processing system 100 processes the video signal, divides each frame in the color image into M monochromatic light images, and divides the divided monochromatic light images of the same color The combination is performed to form at least one single-color image frame, and each single-color image frame is output to different DLP projection apparatuses 200 respectively. When the number of DLP projection apparatuses 200 is less than M, monochrome image frames may also be output to the same DLP projection apparatus 200 .

After the DLP projection apparatus 200 receives the monochromatic image frames, the controller 220 drives the digital micro-lenses in sequence and guides them to the light combining element 300 .

Since each monochromatic image frame includes monochromatic light images of M frames of images in the video signal, the frame rate of each monochromatic image frame is M times the frame rate of the color image in the video signal, thereby achieving high Frame rate display.

The projection system 10 provided in this embodiment can realize the high frame rate display of video signals under the condition that only the single-chip DLP projection device 200 is used, which not only reduces the equipment cost, but also realizes the high frame rate display. During the display process, it will not cause signal distortion and so on.

It should be noted that although the projection system 10 shown in FIG. 7 only includes three DLP projection apparatuses 200, it should not be regarded as a limitation of the present application. In other embodiments, the projection system 10 may further include more than three DLP projection apparatuses 200 .

Referring to FIG. 12, this embodiment also provides a projection method, which can be applied to the above-mentioned projection system 10, and the projection method includes the following steps:

Step S310: Divide each frame in the color image into M monochromatic light images.

Step S320: Combine the segmented monochromatic light images of the same color to form at least one monochromatic image frame.

In some embodiments, in step S220, the segmented monochromatic light images of the same color may also be combined to form at least one monochromatic image frame and at least one mixed color image frame.

Step S330 : output the monochrome image frames to the DLP projection device 200 respectively. When the mixed color image frame is formed in combination, the mixed color image frame is also output to the DLP projection apparatus 200 .

Step S340: Photosynthetic light of the image of at least one monochrome image frame is emitted to a subsequent light path. When a mixed-color image frame is formed in combination, the image light of the single-color image frame and the image light of the mixed-color image frame are combined and then emitted to the subsequent optical path.

It can be understood that, for the specific implementation of the above-mentioned projection method, reference can be made to the content of any of the foregoing embodiments, and details are not described herein again.

The projection method provided in this embodiment can realize high frame rate display under the condition that only the single-chip DLP projection device 200 is used, that is, the equipment cost is reduced, and high frame rate display can be realized.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

A video signal processing system, characterized in that, applied to a projection system, the projection system comprising a DLP projection device, and the video signal processing system comprising:

an image processing unit configured to divide each frame in the color image into M monochromatic light images, and combine the divided monochromatic light images of the same color to form at least one monochromatic image frame , the image processing unit is further configured to output the monochrome image frame to the DLP projection device, wherein M is a positive integer greater than or equal to 3.
The video signal processing system according to claim 1, wherein the projection system comprises M DLP projection devices, and the image processing unit is configured to output different monochrome image frames to different DLP projection devices .
video signal processing system according to claim 2, is characterized in that, described image processing unit is specially used for:

Divide consecutive M frames of color images into groups, divide each image frame in each group into multiple monochromatic light images, and combine the separated monochromatic light images of the same color in the order of image frames to form a single color image. color image frame.
The video signal processing system according to claim 2, wherein the time durations corresponding to each of the monochromatic light images are equal.
The video signal processing system according to claim 1, wherein the image processing unit is configured to divide each frame in the color image into M monochromatic light images, and divide the divided monochromatic light images of the same color. The color light images are combined to form at least one single-color image frame and at least one mixed-color image frame, and the image processing unit is further configured to output the single-color image frame and the mixed-color image frame to the DLP projection device.
The video signal processing system according to claim 5, wherein each of the single-color image frames and each color-mixed image frame have the same duration.
A video signal processing method, characterized in that, applied to a projection system, the projection system comprising a DLP projection device, and the method comprising:

Divide each frame in the color image into M monochromatic light images, where M is a positive integer greater than or equal to 3;

combining the segmented monochromatic light images of the same color to form at least one monochromatic image frame;

The monochrome image frame is output to a DLP projection device.
The method according to claim 7, wherein the dividing each frame in the color image into M monochromatic light images comprises:

Divide consecutive M frames of color images into groups;

Each image frame in each group is divided into a plurality of monochromatic light images.
A projection system, characterized in that, comprising:

The video signal processing system according to any one of claims 1-6;

DLP projection device, the DLP projection device includes a controller and a digital micro-lens, the controller receives the monochrome image frame output by the signal processing system, drives the digital micro-lens in time series, and guides the digital micro-lens to the light combining element; and

and a light combining element, which is used for combining the lights of the plurality of monochromatic image frames and then outputting the light to a subsequent light path.
A projection method, characterized in that, applied to the projection system as claimed in claim 9, comprising:

Divide each frame in the color image into M monochromatic light images;

combining the segmented monochromatic light images of the same color to form at least one monochromatic image frame;

outputting the monochromatic image frame to a DLP projection device, the DLP projection device comprising a controller and a digital microlens, the controller receiving the monochromatic image frame, and driving the digital microlens sequentially; and

The image of at least one of the monochromatic image frames is photosynthesized and then emitted to a subsequent optical path.