CN113281953B - Method for reflecting illumination light spot - Google Patents

Abstract

The application discloses a reflection method of an illumination light spot, which relates to the technical field of projection and is applied to a finished product projection device, and comprises the following steps: replacing a DMD device in the finished product projection device with a diffuse reflection plate to form a detection projection device, wherein the diffuse reflection plate and a substrate in the DMD device have the same size and shape; controlling an illumination light source to emit illumination light spots to the diffuse reflection plate; the diffuse reflection plate diffusely reflects the illumination light spots to the projection lens, and the illumination light spots form a projection picture on the projection screen through the projection lens. The method can totally reflect the illumination light spots, and is beneficial to analyzing whether the illumination light path of the finished product projection device is abnormal or not.

Description

Reflection method of illumination spot

technical field

The present application relates to the field of projection technology, and more specifically, to a reflection method of an illumination spot.

Background technique

At present, projection devices have been used more and more widely.

The projection principle of the projection device is: the illumination light source sends an illumination spot to a digital microreflector (Liquid Crystal on Silicon, DMD) device, and the coverage of the illumination spot is larger than the DMD chip of the DMD device and smaller than the substrate of the DMD device; the working area of the DMD chip and The non-working area reflects part of the illumination spot irradiated on it; while the illumination spot irradiated outside the DMD chip is not reflected.

Since the illumination spot cannot be completely reflected, it is not convenient to analyze whether the illumination light path therein is abnormal based on the existing projection device.

Contents of the invention

An object of the present application is to provide a new technical solution for reflecting the illumination spot.

According to the first aspect of the present application, there is provided a reflection method of illumination spot, which is applied to a finished projection device, including:

The DMD device in the finished projection device is replaced by a diffuse reflection plate to form a detection projection device, and the size and shape of the diffuse reflection plate and the substrate in the DMD device are the same;

controlling the lighting source to emit lighting spots to the diffuse reflection plate;

The illumination spot is diffusely reflected to the projection lens by the diffuse reflection plate, and the illumination spot forms a projection picture on the projection screen through the projection lens.

Optionally, the method also includes:

Make a score on the light-facing surface of the diffuse reflection plate, the size and position of the outline of the score in the diffuse reflection plate, and the active area of the DMD chip in the DMD device in the DMD device same size and position.

Optionally, the method also includes:

Setting the light reflection degree of the target area on the light-facing surface of the diffuse reflection plate to be inconsistent with the light reflection degree of the non-target area on the light-facing surface of the diffuse reflection plate;

Wherein, the size and position of the target area on the diffuse reflection plate are consistent with the size and position of the active area of the DMD chip in the DMD device in the DMD device;

The non-target area is an area on the light-facing surface of the diffuse reflection plate except the target area.

Optionally, the method also includes:

The target area is coated or pasted with non-reflective material.

Optionally, the method also includes:

The area where the standard image is located is marked on the projection screen.

Optionally, the method also includes:

collecting the projected image;

determining the distance between corresponding edge contours according to the first sub-projection picture and the second sub-projection picture in the projection picture;

Wherein, the projection picture includes a first sub-projection picture corresponding to a residual illumination spot and a second sub-projection picture corresponding to a non-residual illumination spot.

Optionally, the determining the distance between corresponding edge contours according to the first sub-projection picture and the second sub-projection picture in the projection picture includes:

According to the first sub-projection picture and the second sub-projection picture in the projection picture, an average value of distances between corresponding edge contours at different positions is determined.

Optionally, the illumination light source includes a red photon light source, a green photon light source, and a blue photon light source, and the control illumination light source emits an illumination spot to the diffuse reflection plate, including:

controlling the red photon light source in the illumination light source to emit an illumination spot to the diffuse reflection plate;

Or, controlling the green photon light source in the illumination light source to emit illumination spots to the diffuse reflection plate;

Or, controlling the blue photon light source in the illumination light source to emit illumination spots to the diffuse reflection plate;

Or, controlling the red photon light source, the green photon light source, and the blue photon light source in the illumination light source to emit illumination light spots to the diffuse reflection plate.

Optionally, the diffuse reflection plate is a copper substrate.

In the embodiment of the present application, a reflection method of illumination spot is provided, which is applied to the finished projection device, including: replacing the DMD device in the finished projection device with a diffuse reflection plate to form a detection projection device, the diffuse reflection plate and the DMD device The size and shape of the middle substrate are the same; the lighting source is controlled to emit lighting spots to the diffuse reflection plate; the diffuse reflection plate diffusely reflects the lighting spots to the projection lens, and the lighting spots form a projection picture on the projection screen through the projection lens. In the embodiment of this application, the size and position of the diffuse reflection plate and the substrate in the DMD device are the same. On the basis that the coverage of the illumination spot emitted by the illumination source is larger than that of the DMD chip and smaller than the substrate of the DMD device, the coverage of the illumination spot emitted by the illumination source is larger than that of the substrate of the DMD device. All the illumination spots are illuminated on the diffuse reflector. Since the diffuse reflection plate can diffusely reflect the illumination spot irradiated on it, the diffuse reflection plate can reflect all parts of the illumination spot to form a projection picture on the projection screen through the projection lens, which is beneficial to analyze the finished projection Whether the lighting light path of the device is abnormal.

Other features of the present application and advantages thereof will become apparent through the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate the embodiments of the application and together with the description serve to explain the principles of the application.

Fig. 1 is the structural representation of DMD device;

Fig. 2 is a schematic flowchart of a reflection method for illuminating spot provided by an embodiment of the present application;

FIG. 3 is a schematic diagram of detecting a projection screen formed by a projection device.

Detailed ways

Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as any limitation of the application, its application or uses.

Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the description.

In all examples shown and discussed herein, any specific values should be construed as exemplary only, and not as limitations. Therefore, other instances of the exemplary embodiment may have different values.

It should be noted that like numerals and letters denote like items in the following figures, therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

The finished projection device includes: lighting source, DMD device, projection lens and projection screen. Wherein, the exemplary structure of the DMD device is shown in FIG. 1 , including a substrate and a DMD chip, and the DMD chip includes an active area and a non-active area.

The projection process of the finished projection device is as follows: the illumination light source emits illumination light spots on the DMD device. Wherein, the coverage of the illumination spot is larger than the DMD chip and smaller than the substrate of the DMD device. The active area of the DMD chip reflects part of the illumination light spots irradiated thereon, so that the part of the illumination light spots irradiated thereon forms an image to be displayed on the projection screen through the projection lens. The non-active area of the DMD chip reflects a part of the illumination light spot irradiated thereon, so that the part of the illumination light spot irradiated thereon forms a gray frame on the projection screen through the projection lens. Part of the illumination light spot irradiated outside the DMD chip cannot be reflected to be projected to the projection screen through the projection lens.

Since part of the illumination spot irradiated outside the DMD chip cannot be reflected to be projected to the projection screen through the projection lens, this causes the illumination spot to be unable to be completely reflected. Therefore, the distribution of the illumination spot cannot be known based on the finished projection device, which is inconvenient based on The finished projection device is analyzed to see if the illumination light path therein is abnormal.

It should be noted that it is only possible to analyze whether the illumination light path in the finished projection device is abnormal if the part of the illumination light spot irradiated outside the DMD chip and the illumination light spot irradiated on the non-active area of the DMD chip are known.

To solve this problem, an embodiment of the present application provides a reflection method of an illumination spot, so as to realize that the illumination spot is completely reflected and projected to a projection screen through a projection lens.

In combination with the above content, an embodiment of the present application provides a reflection method of an illumination spot, and the method is applied to the above-mentioned product projection device. Wherein, the remaining lighting spot refers to the lighting spot composed of a part of the lighting spot irradiated on the non-working area of the DMD chip and a part of the lighting spot irradiated outside the DMD chip.

As shown in Figure 2, a reflection method of illumination spot provided by the embodiment of the present application includes the following S2100-S2300:

S2100, replacing the DMD device in the finished projection device with a diffuse reflection plate to form a detection projection device, where the size and shape of the diffuse reflection plate are the same as those of the substrate in the DMD device.

In the embodiment of the present application, the projection device formed by replacing the DMD device in the finished projection device with a diffuse reflection plate is referred to as a detection projection device.

And, the DMD device in the finished projecting device is replaced with the size of the substrate in the DMD device and the same diffuse reflection plate, can realize the size, shape and the same position of the diffuse reflection plate and the DMD device, so that it can be as far as possible The finished projection device can be fully restored, thereby avoiding the inaccurate analysis of whether the illumination light path of the finished projection device is abnormal or not due to the instability of the diffuse reflection plate itself and the change in the distance from the projection lens.

It can be understood that the DMD chip has little influence on the size and shape of the DMD device due to its small size. That is to say, the size and shape of the substrate in the DMD device can replace the size and shape of the DMD device.

In an embodiment of the present application, the diffuse reflection plate may be a copper substrate, and of course other types of diffuse reflection plates may also be used, which is not limited in this application.

S2200. Control the illumination light source to emit illumination light spots to the diffuse reflection plate.

S2300. Diffusely reflect the illuminating light spot to the projection lens by the diffuse reflection plate, and the illuminating light spot forms a projection picture on the projection screen through the projection lens.

In this embodiment of the present application, the projection screen may be a curtain, a wall, or the like.

In the embodiment of the present application, the lighting source is controlled to emit lighting spots to the diffuse reflection plate. Since the size and position of the diffuse reflection plate and the DMD device are the same, on the basis that the coverage of the illumination spot emitted by the illumination source is larger than the DMD chip and smaller than the substrate of the DMD device, the illumination spot emitted by the illumination source is all irradiated on the Diffuse board. Since the diffuse reflection plate can diffusely reflect the illumination light spot irradiated thereon, the diffuse reflection plate can reflect all the illumination light spot to form a projection picture on the projection screen through the projection lens.

In the embodiment of the present application, a reflection method of illumination spot is provided, which is applied to the finished projection device, including: replacing the DMD device in the finished projection device with a diffuse reflection plate to form a detection projection device, the diffuse reflection plate and the DMD device The size and shape of the middle substrate are the same; the lighting source is controlled to emit lighting spots to the diffuse reflection plate; the diffuse reflection plate diffusely reflects the lighting spots to the projection lens, and the lighting spots form a projection picture on the projection screen through the projection lens. In the embodiment of this application, the size and position of the diffuse reflection plate and the substrate in the DMD device are the same. On the basis that the coverage of the illumination spot emitted by the illumination source is larger than that of the DMD chip and smaller than the substrate of the DMD device, the coverage of the illumination spot emitted by the illumination source is larger than that of the substrate of the DMD device. All the illumination spots are illuminated on the diffuse reflector. Since the diffuse reflection plate can diffusely reflect the illumination spot irradiated on it, the diffuse reflection plate can reflect all parts of the illumination spot to form a projection picture on the projection screen through the projection lens, which is beneficial to analyze the finished projection Whether the lighting light path of the device is abnormal.

It can be understood that the illumination facula is composed of residual illumination facula and non-residual illumination facula (part of the illumination facula except the residual illumination facula), therefore, the projection screen formed by the detection projection device includes residual The first sub-projection picture corresponding to the illumination spot and the second sub-projection picture corresponding to the non-residual illumination spot.

Further, on the basis that the projection picture includes the first sub-projection picture corresponding to the remaining illumination spot, by detecting the first sub-projection picture, the information of the remaining illumination spot can be detected. According to the information of the remaining illumination light spots, it can be realized whether the illumination light path of the finished projection device is abnormal. On this basis, in one embodiment of the present application, the reflection method of the illumination spot provided by the embodiment of the present application also includes the following three ways to highlight the first sub-projection picture in the projection picture, so as to achieve the first sub-projection The detection of the projection screen provides the basis for detection:

The first method: scratches are made on the light-facing surface of the diffuse reflection plate, and the size and position of the outline of the score in the diffuse reflection plate are consistent with the size and position of the active area of the DMD chip in the DMD device. .

In the embodiment of the present application, marks are used on the diffuse reflection plate to mark the location of the active area of the DMD chip, so that part of the illumination spot irradiated on the mark is reflected by the diffuse reflection plate to be projected to the projection screen through the projection lens The grayscale corresponding to the picture formed in the center is different from the grayscale corresponding to the picture formed by the part of the illumination spot irradiated on the non-scratched place that is reflected by the diffuse reflection plate and projected to the projection screen through the projection lens. Therefore, by scratching the diffuse reflection plate, the boundary line between the first sub-projection picture and the second sub-projection picture can appear in the projection picture, wherein the first sub-projection picture is located at the periphery of the second sub-projection picture. On this basis, the first sub-projection picture can be highlighted in the projection picture. By detecting the first sub-projection picture, the information of the remaining illumination facula can be detected.

The second method: the light reflection degree of the target area on the light-facing surface of the diffuse reflection plate is set to be inconsistent with the light reflection degree of the non-target area on the light-facing surface of the diffuse reflection plate; wherein, the size of the target area on the diffuse reflection plate and The position is consistent with the size and position of the active area of the DMD chip in the DMD device; the non-target area is the area on the light-facing surface of the diffuse reflection plate except the target area.

In the embodiment of this application, the target area corresponds to the active area of the DMD chip, and the non-target area corresponds to the area on the light-facing surface of the diffuse reflection plate except for the target area, that is, the non-target area corresponds to the area on the DMD device other than the target area. The area outside the active area of the DMD chip, therefore, part of the illumination spot irradiated on the target area is reflected by the diffuse reflection plate and projected to the projection screen through the projection lens to form a picture, which is the second sub-projection picture. Part of the illumination spot irradiated on the target area is reflected by the diffuse reflection plate and projected onto the projection screen through the projection lens to form a first sub-projection image. On this basis, because the light reflection degree of the target area on the diffuse reflection plate is inconsistent with that of the non-target area, when the illumination source emits illumination spots to the diffuse reflection plate, part of the illumination spots irradiated on the non-target area passes through the diffuse reflection plate. The grayscale corresponding to the second sub-projection picture that is reflected to be projected to the projection screen through the projection lens is different from the first sub-projection formed by the part of the illumination spot irradiated on the target area that is reflected by the diffuse reflection plate and projected to the projection screen through the projection lens. The corresponding grayscale of the projected image. In this way, the first sub-projection picture can be highlighted in the projection picture. By detecting the first sub-projection picture, the information of the remaining illumination facula can be detected.

In the second way, the light reflection degree of the target area on the light-facing surface of the diffuse reflection plate and the non-target area on the light-facing surface of the diffuse reflection plate can be set by coating or pasting non-reflective materials on the target area. Areas do not reflect light uniformly. That is to say, the reflection method of the illumination spot provided by the embodiment of the present application further includes: a step of coating or pasting a non-reflective material on the target area.

The third method: The area where the standard image is located is marked on the projection screen.

In the embodiment of the present application, first, a standard finished projection device is used for projection to form a projected image on a projection screen. The area of the image to be displayed is marked on the projection screen by manual marking. Wherein, the standard finished projection device is a projection device having the same specifications as the finished projection device involved in the embodiment of the present application and having a normal illumination optical path.

Then, the detection and projection device provided by the embodiment of the present application is placed at the same position as the quasi-finished product projection device, and the detection and projection device is controlled to form a projection picture on the projection screen. The part of the projected picture on the projection screen other than the identified area of the image to be displayed is recorded as the first sub-projected picture.

In an embodiment of the present application, the distance between the corresponding edge contours of the first sub-projection area and the second sub-projection area may be measured manually, so as to obtain information reflecting the residual illumination facula.

In another embodiment of the present application, the distance between the corresponding edge contours of the first sub-projection area and the second sub-projection area may also be measured in an automated manner, so as to obtain information reflecting the residual illumination facula. On this basis, the reflection method of the illumination spot provided in the embodiment of the present application further includes the following S2400 and S2500:

S2400. Collect the projected image.

S2500. Determine the distance between corresponding edge contours according to the first sub-projection picture and the second sub-projection picture in the projection picture;

Wherein, the projection picture includes a first sub-projection picture corresponding to the residual illumination spot and a second sub-projection picture corresponding to a non-residual illumination spot.

In the embodiment of the present application, the projected picture may be captured by an image capture device. After the projection picture is collected, the grayscale of the projection picture is analyzed to obtain the first sub-projection picture and the second sub-projection picture. Then, calculate the distance between the corresponding edge contours, and restore the distance to the world coordinate system. In this way, the actual distance between the corresponding edge contours reflecting the remaining illumination spot information can be obtained.

In one example, the actual distance between the upper contour of the first sub-projection picture and the upper contour of the second sub-projection picture can be exemplarily shown as d1 or d2 shown in FIG. 3 , the left contour of the first sub-projection picture and The actual distance of the left contour of the second sub-projection picture can be exemplarily shown as D1 or D2 shown in FIG. 3 .

In an embodiment of the present application, the specific implementation of the above S2500 may be: according to the first sub-projection picture and the second sub-projection picture in the projection picture, determine the average value of the distances between corresponding edge contours at different positions.

Exemplarily, as shown in Figure 3, the average value between d1 and d2 can be used as the actual distance between the upper contour of the first sub-projection picture and the upper contour of the second sub-projection picture, and the average value between D1 and D2 The value is used as the actual distance between the left contour of the first sub-projection picture and the left contour of the second sub-projection picture.

In the embodiment of the present application, by means of the average value, the average value of the distance between the corresponding edge contours at different positions can be accurately calculated according to the first sub-projection picture and the second sub-projection picture in the projection picture .

In one embodiment of the present application, since the illumination light source usually includes three sub-light sources of red, green and blue, if the position of any sub-light source among the three sub-light sources of red, green and blue is shifted, Both will lead to the abnormality of the illumination light path of the finished projection device. Therefore, the red, green, and blue sub-light sources can be controlled separately to completely reflect the corresponding sub-light sources, so as to analyze whether the illumination light path corresponding to the corresponding sub-light sources is abnormal. On this basis, the reflection method of the illumination spot provided in the embodiment of the present application further includes any of the following steps of S2610-S2640:

S2610. Control the red photon light source in the illumination light source to emit illumination light spots to the diffuse reflection plate.

S2620. Control the green photon light source in the illumination light source to emit illumination light spots to the diffuse reflection plate.

S2630. Control the blue photon light source in the illumination light source to emit illumination light spots to the diffuse reflection plate.

S2640. Control the red photon light source, the green photon light source, and the blue photon light source in the illumination light source to emit illumination light spots to the diffuse reflection plate.

It can be understood that when the red photon light source, the green photon light source, and the blue photon light source simultaneously emit lighting spots to the diffuse reflection plate, the actual lighting spots are white light.

In the embodiment of the present application, complete reflection of the red photon light source, green photon light source, blue photon light source, and white light source can be respectively realized, so as to analyze whether the illumination light path corresponding to the corresponding sub-light source is abnormal. This enables a more targeted analysis of whether the illumination light path of the finished projection device is abnormal.

The present application may be a system, method and/or computer program product. A computer program product may include a computer readable storage medium having computer readable program instructions thereon for causing a processor to implement various aspects of the present application.

A computer readable storage medium may be a tangible device that can retain and store instructions for use by an instruction execution device. A computer readable storage medium may be, for example, but is not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer diskettes, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), or flash memory), static random access memory (SRAM), compact disc read only memory (CD-ROM), digital versatile disc (DVD), memory stick, floppy disk, mechanically encoded device, such as a printer with instructions stored thereon A hole card or a raised structure in a groove, and any suitable combination of the above. As used herein, computer-readable storage media are not to be construed as transient signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., pulses of light through fiber optic cables), or transmitted electrical signals.

Computer-readable program instructions described herein may be downloaded from a computer-readable storage medium to a respective computing/processing device, or downloaded to an external computer or external storage device over a network, such as the Internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and/or edge servers. A network adapter card or a network interface in each computing/processing device receives computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in a computer-readable storage medium in each computing/processing device .

Computer program instructions for performing the operations of the present application may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or Source or object code written in any combination, including object-oriented programming languages—such as Smalltalk, C++, etc., and conventional procedural programming languages—such as the “C” language or similar programming languages. Computer readable program instructions may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer, or entirely on the remote computer or server implement. In cases involving a remote computer, the remote computer can be connected to the user computer through any kind of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computer (such as via the Internet using an Internet service provider). connect). In some embodiments, an electronic circuit, such as a programmable logic circuit, field programmable gate array (FPGA), or programmable logic array (PLA), can be customized by utilizing state information of computer-readable program instructions, which can Various aspects of the present application are implemented by executing computer readable program instructions.

Aspects of the present application are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It should be understood that each block of the flowcharts and/or block diagrams, and combinations of blocks in the flowcharts and/or block diagrams, can be implemented by computer-readable program instructions.

These computer-readable program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine such that when executed by the processor of the computer or other programmable data processing apparatus , producing an apparatus for realizing the functions/actions specified in one or more blocks in the flowchart and/or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium, and these instructions cause computers, programmable data processing devices and/or other devices to work in a specific way, so that the computer-readable medium storing instructions includes An article of manufacture comprising instructions for implementing various aspects of the functions/acts specified in one or more blocks in flowcharts and/or block diagrams.

It is also possible to load computer-readable program instructions into a computer, other programmable data processing device, or other equipment, so that a series of operational steps are performed on the computer, other programmable data processing device, or other equipment to produce a computer-implemented process , so that instructions executed on computers, other programmable data processing devices, or other devices implement the functions/actions specified in one or more blocks in the flowcharts and/or block diagrams.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. In this regard, each block in a flowchart or block diagram may represent a module, a portion of a program segment, or an instruction that includes one or more Executable instructions. In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks in succession may, in fact, be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. It should also be noted that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by a dedicated hardware-based system that performs the specified function or action , or may be implemented by a combination of dedicated hardware and computer instructions. It is well known to those skilled in the art that implementation by means of hardware, implementation by means of software, and implementation by a combination of software and hardware are all equivalent.

Having described various embodiments of the present application above, the foregoing description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and alterations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles of the various embodiments, practical applications or technical improvements over technologies in the market, or to enable other persons of ordinary skill in the art to understand the various embodiments disclosed herein. The scope of the application is defined by the appended claims.

Claims (8)

1. A reflection method of illumination spot, is characterized in that, is applied to finished product projection device, comprises: The DMD device in the finished projection device is replaced by a diffuse reflection plate to form a detection projection device, and the size and shape of the diffuse reflection plate and the substrate in the DMD device are the same; controlling the lighting source to emit lighting spots to the diffuse reflection plate; The illumination spot is diffusely reflected to the projection lens by the diffuse reflection plate, and the illumination spot forms a projection picture on the projection screen through the projection lens; Wherein, the method also includes: collecting the projected image; determining the distance between corresponding edge contours according to the first sub-projection picture and the second sub-projection picture in the projection picture; Wherein, the projection picture includes a first sub-projection picture corresponding to the residual lighting spot and a second sub-projection picture corresponding to the non-residual lighting spot; Wherein, the remaining illumination spot refers to the illumination spot composed of the partial illumination spot irradiated on the non-working area of the DMD chip and the part of the illumination spot irradiated outside the DMD chip, and the DMD chip includes a working area and a non-working area . 2. The method according to claim 1, characterized in that the method further comprises: Setting the light reflection degree of the target area on the light-facing surface of the diffuse reflection plate to be inconsistent with the light reflection degree of the non-target area on the light-facing surface of the diffuse reflection plate; Wherein, the size and position of the target area on the diffuse reflection plate are consistent with the size and position of the active area of the DMD chip in the DMD device in the DMD device; The non-target area is an area on the light-facing surface of the diffuse reflection plate except the target area. 3. The method according to claim 1, characterized in that the method further comprises: Make a score on the light-facing surface of the diffuse reflection plate, the size and position of the outline of the score in the diffuse reflection plate, and the active area of the DMD chip in the DMD device in the DMD device same size and position. 4. The method according to claim 2, characterized in that the method further comprises: The target area is coated or pasted with non-reflective material. 5. The method according to claim 1, wherein the method further comprises: The area where the standard image is located is marked on the projection screen. 6. The method according to claim 1, wherein, according to the first sub-projection picture and the second sub-projection picture in the projection picture, determining the distance between corresponding edge contours comprises: According to the first sub-projection picture and the second sub-projection picture in the projection picture, an average value of distances between corresponding edge contours at different positions is determined. 7. The method according to claim 1, wherein the illumination light source includes a red photon light source, a green photon light source, and a blue photon light source, and the control of the illumination light source to emit an illumination spot to the diffuse reflection plate includes: controlling the red photon light source in the illumination light source to emit an illumination spot to the diffuse reflection plate; Or, controlling the green photon light source in the illumination light source to emit illumination spots to the diffuse reflection plate; Or, controlling the blue photon light source in the illumination light source to emit illumination spots to the diffuse reflection plate; Or, controlling the red photon light source, the green photon light source, and the blue photon light source in the illumination light source to emit illumination light spots to the diffuse reflection plate. 8. The method according to claim 1, wherein the diffuse reflection plate is a copper substrate.

Images