CN114076576B - Light emitter, camera module, electronic equipment and image three-dimensional information acquisition method - Google Patents
Light emitter, camera module, electronic equipment and image three-dimensional information acquisition method Download PDFInfo
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- CN114076576B CN114076576B CN202010854954.4A CN202010854954A CN114076576B CN 114076576 B CN114076576 B CN 114076576B CN 202010854954 A CN202010854954 A CN 202010854954A CN 114076576 B CN114076576 B CN 114076576B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000004040 coloring Methods 0.000 claims abstract description 8
- 238000002834 transmittance Methods 0.000 claims description 6
- 238000003384 imaging method Methods 0.000 abstract description 18
- 230000008569 process Effects 0.000 abstract description 7
- 230000007246 mechanism Effects 0.000 abstract description 6
- 230000008859 change Effects 0.000 abstract description 5
- 239000003086 colorant Substances 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/25—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object
- G01B11/254—Projection of a pattern, viewing through a pattern, e.g. moiré
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/25—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object
- G01B11/2536—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object using several gratings with variable grating pitch, projected on the object with the same angle of incidence
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/56—Cameras or camera modules comprising electronic image sensors; Control thereof provided with illuminating means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/57—Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
Abstract
The application discloses a light emitter, comprising: a light emitter body; the electrochromic layers are arranged on the light emitter body, each electrochromic layer comprises strip-shaped electrochromic areas which are arranged at equal intervals, the width of the strip-shaped electrochromic areas of different electrochromic layers is different, the intervals are different, and the at least two electrochromic layers are respectively used for coloring to form different gratings; the electrochromic layer has no influence on the imaging mechanism, so that the imaging resolution of the imaging mechanism is ensured, and the electrochromic layer only needs weak current for color change in the process, so that the power consumption of the electronic equipment is reduced.
Description
Technical Field
The application relates to the technical field of light processing, in particular to a light emitter, a camera module, electronic equipment and an image three-dimensional information acquisition method.
Background
In the process of acquiring image information by the electronic equipment, three-dimensional information or depth information of an object can be acquired for better imaging, so that the imaged object has better stereoscopic impression.
In the prior art, depth information of an object is calculated using TOF (time of flight ranging) or speckle ranging using a property derived from optical speckle.
However, the low resolution of the sensing rate of the existing TOF basis can reduce the imaging precision and resolution, while the electronic component based on the speckle ranging method has large power consumption and heat productivity during operation, which is unfavorable for long-time operation, so that the existing method for collecting the three-dimensional information of the object cannot ensure high resolution and simultaneously reduce the power consumption of the electronic equipment.
Disclosure of Invention
In view of the above, the application provides a light emitter, a camera module, an electronic device and an image three-dimensional information acquisition method, so as to solve the problem that the existing method for acquiring the three-dimensional information of an object cannot guarantee resolution and does not increase power consumption of the electronic device.
A first aspect of the application provides a light emitter comprising: a light emitter body; and the electrochromic layers are arranged on at least two layers on the light emitter body, each electrochromic layer comprises strip-shaped electrochromic areas which are arranged at equal intervals, the strip-shaped electrochromic areas of different electrochromic layers are different in width and different in interval, and the at least two electrochromic layers are respectively used for coloring to form different gratings.
Wherein, the light emitter further includes: and a transparent insulating layer disposed between adjacent electrochromic layers.
Wherein, each interval area of the strip electrochromic area of each electrochromic layer is provided with a transparent electrode, one side of each strip electrochromic area is provided with a transparent positive electrode, and the other side is provided with a transparent negative electrode.
Wherein, all transparent positive electrodes on each electrochromic layer are in an interdigital electrode shape; all transparent negative electrodes on each electrochromic layer are in the shape of another interdigital electrode.
Wherein the light emitter further comprises: the end parts of each two adjacent strip-shaped electrochromic areas of each layer are provided with an insulating area, the end parts of the interdigital electrode-shaped transparent positive electrode and the interdigital electrode-shaped transparent negative electrode are separated by the insulating area, and the side edges of the interdigital electrode-shaped transparent positive electrode and the interdigital electrode-shaped transparent negative electrode are electrically connected with the strip-shaped electrochromic areas.
According to the light emitter, different gratings can be formed by changing the colors of different electrochromic layers, so that stripe patterns with different pitches can be generated by the different gratings to be projected on the surface of an object. When the light emitter is applied to electronic equipment to collect images, three-dimensional information of the images can be obtained according to the images collected after the images are projected onto the surface of an object by different gratings. The electrochromic layer has no influence on the light emitter, so that the imaging resolution is ensured, and the electrochromic layer only needs weak current for color change in the process, so that the power consumption of the electronic equipment is reduced.
The second aspect of the application provides a method for acquiring three-dimensional information of an image, which comprises the following steps: providing a light emitter, wherein the light emitter comprises a light emitter body and at least two electrochromic layers arranged on the light emitter body, each electrochromic layer comprises strip-shaped electrochromic areas which are arranged at equal intervals, and the strip-shaped electrochromic areas of different electrochromic layers have different widths and different intervals; controlling at least two electrochromic layers to be respectively colored to form different gratings; controlling the light emitter body to emit light, and generating a stripe pattern to project the light emitted by the light emitter body to the surface of an object after passing through different gratings; images are acquired that are generated through different gratings to generate three-dimensional information of the object.
Wherein each time the one electrochromic layer of the light emitter is controlled to change color comprises: applying a voltage to one electrochromic layer at a time reduces the light transmittance of the electrochromic layer, or withdrawing the voltage applied to one electrochromic layer at a time reduces the light transmittance of the electrochromic layer.
The light emitter further comprises interdigital electrodes, each electrochromic layer is provided with two interdigital electrodes respectively composed of two transparent positive electrodes and two transparent negative electrodes, and two transparent positive electrodes and one transparent negative electrode are respectively arranged on two sides of a strip-shaped electrochromic area of each electrochromic layer; the changing of the color of the electrochromic layer of the light emitter each time comprises the following steps: when coloring is needed, positive voltage and negative voltage are respectively applied to the interdigital electrode formed by the positive electrode and the interdigital electrode formed by the negative electrode of the electrochromic layer; when the color is required to fade, the positive voltage and the negative voltage are respectively cancelled for the interdigital electrode formed by the positive electrode and the interdigital electrode formed by the negative electrode of the electrochromic layer.
According to the image three-dimensional information acquisition method, different fringe patterns can be generated to project on the surface of the object for imaging by enabling the electrochromic layers of the light emitters to change colors, so that the three-dimensional information of the object can be analyzed according to the imaging of the different fringe patterns projected on the surface of the object, the resolution of imaging of the imaging mechanism is ensured because the electrochromic layers do not influence the imaging mechanism, and in the process, the electrochromic layers only need weak current for changing colors, so that the power consumption of electronic equipment is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a partial front view of a light emitter according to an embodiment of the present application;
FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1;
FIG. 3 is an effect diagram of the use of a light emitter according to an embodiment of the present application;
fig. 4 is a schematic flow chart of a three-dimensional information acquisition method according to an embodiment of the application.
Detailed Description
The following description of the embodiments of the present application will be made in detail and with reference to the accompanying drawings, wherein it is apparent that the embodiments described are only some, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application. The various embodiments described below and their technical features can be combined with each other without conflict.
Referring to fig. 1, an optical transmitter provided in an embodiment of the present application includes: a light emitter body 1 and at least two electrochromic layers 2; the electrochromic layers 2 are arranged on the light emitter body 1, each electrochromic layer 2 comprises strip-shaped electrochromic areas which are arranged at equal intervals, the width of the strip-shaped electrochromic areas of different electrochromic layers 2 is different, the intervals are different, and at least two electrochromic layers 2 are respectively used for coloring to form different gratings.
In this embodiment, when one electrochromic layer 2 changes color, the rest electrochromic layers 2 are set to be transparent, and when each electrochromic layer 2 changes color in turn, different gratings are formed, so that after light emitted by the light emitter body 1 passes through the different gratings, different fringe patterns are generated and projected onto the surface of the object to perform imaging, and thus three-dimensional information of the object can be analyzed according to the imaging of the different fringe patterns projected onto the surface of the object.
In order to reduce the influence of the electrochromic layers 2 on each other when the electrochromic layers 2 are electrified, a transparent insulating layer 5 is arranged between the adjacent electrochromic layers 2, and the adjacent electrochromic layers 2 are separated by the transparent insulating layer 5, so that the influence of the electrochromic layers 2 on each other when the electrochromic layers 2 are electrified is reduced, in the embodiment, the electrochromic layers 2 are two layers, and a transparent insulating layer 5 is arranged between the two electrochromic layers 2.
Referring to fig. 1 and 2, a transparent electrode is disposed in each of the spaced areas of the strip-shaped electrochromic regions of each electrochromic layer 2, a transparent positive electrode 3 is disposed on one side of each strip-shaped electrochromic region, and a transparent negative electrode 4 is disposed on the other side.
When the electrochromic layer 2 is electrified, the electrochromic layer 2 can be electrified by applying corresponding voltages to the transparent positive electrode 3 and the transparent negative electrode 4, so that a circuit is not required to be directly arranged on the electrochromic layer 2.
Referring to fig. 2, in order to facilitate energizing all the transparent positive electrodes 3 and the transparent negative electrodes 4 of one electrochromic layer 2, the complexity of circuit arrangement is reduced, and all the transparent positive electrodes 3 on each electrochromic layer 2 are in the shape of an interdigital electrode; all transparent negative electrodes 4 on each electrochromic layer 2 are in the shape of another interdigital electrode.
In order to facilitate control of the electrochromic layers 2, in this embodiment, the electrochromic characteristics of all electrochromic layers 2 are uniform, i.e., all electrochromic layers 2 are in a non-transparent state in an energized state and in a transparent state in a de-energized state.
In other embodiments, the electrochromic properties of the electrochromic layers 2 may be uniform, i.e. all electrochromic layers 2 are transparent in the energized state and non-transparent in the de-energized state.
In other embodiments, the characteristics of the electrochromic layer 2 may also be non-uniform, i.e., a portion of the electrochromic layer 2 has an electrochromic characteristic that is non-transparent in the energized state, transparent in the de-energized state, another portion of the electrochromic layer 2 has an electrochromic characteristic that is transparent in the energized state, and non-transparent in the de-energized state.
Referring to fig. 3, the electrochromic layer 2 may also be four layers, and fig. 3 is an image generated by forming different gratings after the four electrochromic layers 2 are respectively discolored, and the light emitted by the light emitter body 1 passes through one grating each time and then is projected on the surface of the object.
The embodiment of the application provides a camera module, which comprises the light emitter in the embodiment.
The embodiment of the application provides electronic equipment, which comprises the camera module in the embodiment.
The embodiment of the application provides a three-dimensional image information acquisition method, which uses a light emitter, wherein the light emitter comprises: a light emitter body; and the electrochromic layers are arranged on the light emitter body, each electrochromic layer comprises strip-shaped electrochromic areas which are arranged at equal intervals, the strip-shaped electrochromic areas of different electrochromic layers are different in width and interval, and the at least two electrochromic layers are respectively used for coloring to form different gratings.
Referring to fig. 4, the image three-dimensional information acquisition method includes: s1, providing a light emitter; s2, controlling at least two electrochromic layers of the light emitter to be respectively colored to form different gratings; s3, controlling a light emitter body of the light emitter to emit light, and projecting the light emitted by the light emitter body onto the surface of an object through stripe patterns generated after the light passes through different gratings; s4, acquiring and generating images passing through different gratings to generate three-dimensional information of the object.
In this embodiment, step S4 generates three-dimensional information of the object using a method of three-dimensional reconstruction of structured light after acquiring and generating images passing through different gratings, the method of three-dimensional reconstruction of structured light includes: and respectively carrying out row scanning and column scanning on two-dimensional coordinate pixel points in the image, and then carrying out differential processing on the images at adjacent time intervals to determine the positions of the coding patterns in the pixel points, so as to determine the mapping relation between the coding patterns and the position points of each point cloud.
Each time the color of one electrochromic layer of the light emitter is controlled, the color change of the one electrochromic layer comprises: applying a voltage to one electrochromic layer at a time reduces the light transmittance of the electrochromic layer, or withdrawing the voltage applied to one electrochromic layer at a time reduces the light transmittance of the electrochromic layer.
In this embodiment, all electrochromic layers have consistent electrochromic characteristics, i.e., are in a non-transparent state in an energized state and in a transparent state in a de-energized state.
In other embodiments, the electrochromic characteristics of all electrochromic layers may be uniform, i.e., transparent in the energized state and non-transparent in the de-energized state.
In other embodiments, the electrochromic layer may also be non-uniform in character, i.e., a portion of the electrochromic layer may have an electrochromic character that is non-transparent in the energized state, transparent in the de-energized state, and another portion of the electrochromic layer may have an electrochromic character that is transparent in the energized state, and non-transparent in the de-energized state.
In the above light emitter, the light emitter further comprises interdigital electrodes, each electrochromic layer is provided with two interdigital electrodes respectively composed of two transparent positive electrodes and two transparent negative electrodes, and two sides of the strip-shaped electrochromic area of the electrochromic layer are respectively provided with one transparent positive electrode and one transparent negative electrode;
the electrochromic layer of a layer of each time control light emitters discolours specifically includes: when coloring is needed, positive voltage and negative voltage are respectively applied to the interdigital electrode formed by the positive electrode and the interdigital electrode formed by the negative electrode of the electrochromic layer; when the color is required to fade, the positive voltage and the negative voltage are respectively cancelled for the interdigital electrode formed by the positive electrode and the interdigital electrode formed by the negative electrode of the electrochromic layer.
According to the image three-dimensional information acquisition method provided by the embodiment, different fringe patterns can be generated to project on the surface of the object for imaging by enabling the electrochromic layers of the light emitters to be changed in color, so that the three-dimensional information of the object can be analyzed according to the imaging of the different fringe patterns projected on the surface of the object, the resolution of imaging of the imaging mechanism is ensured because the electrochromic layers do not influence the imaging mechanism, and in the process, the electrochromic layers are changed only by weak current, so that the power consumption of electronic equipment is reduced.
Although the application has been shown and described with respect to one or more implementations, equivalent alterations and modifications will occur to others skilled in the art based upon a reading and understanding of this specification and the annexed drawings. The present application includes all such modifications and alterations and is limited only by the scope of the following claims. In particular regard to the various functions performed by the above described components, the terms used to describe such components are intended to correspond, unless otherwise indicated, to any component which performs the specified function of the described component (e.g., that is functionally equivalent), even though not structurally equivalent to the disclosed structure which performs the function in the herein illustrated exemplary implementations of the specification.
That is, the foregoing embodiments of the present application are merely examples, and are not intended to limit the scope of the present application, and all equivalent structures or equivalent processes using the descriptions of the present application and the accompanying drawings, such as the combination of technical features of the embodiments, or direct or indirect application in other related technical fields, are included in the scope of the present application.
In addition, in the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. In addition, the present application may be identified by the same or different reference numerals for structural elements having the same or similar characteristics. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present application, the term "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described as "exemplary" in this disclosure is not necessarily to be construed as preferred or advantageous over other embodiments. The previous description is provided to enable any person skilled in the art to make or use the present application. In the above description, various details are set forth for purposes of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes have not been shown in detail to avoid unnecessarily obscuring the description of the application. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
Claims (7)
1. A light emitter, comprising:
a light emitter body;
the electrochromic device comprises a light emitter body, and is characterized in that the light emitter body is provided with at least two electrochromic layers, each electrochromic layer comprises strip-shaped electrochromic areas which are arranged at equal intervals, the width of each strip-shaped electrochromic area of each electrochromic layer is different, the interval of each strip-shaped electrochromic area is different, the at least two electrochromic layers are respectively used for coloring to form different gratings, a transparent electrode is arranged in each interval area of each strip-shaped electrochromic area of each electrochromic layer, one side of each strip-shaped electrochromic area is provided with a transparent positive electrode, and the other side of each strip-shaped electrochromic area is provided with a transparent negative electrode.
2. The light emitter of claim 1, wherein the light emitter comprises a light source,
the light emitter further comprises:
and a transparent insulating layer disposed between adjacent electrochromic layers.
3. The light emitter of claim 1, wherein the light emitter comprises a light source,
all transparent positive electrodes on each electrochromic layer are in an interdigital electrode shape;
all transparent negative electrodes on each electrochromic layer are in the shape of another interdigital electrode.
4. The light emitter of claim 3, wherein the light emitter comprises a light source,
the light emitter further comprises: the end parts of every two adjacent strip-shaped electrochromic areas of each layer are provided with an insulating area, the end parts of the interdigital electrode-shaped transparent positive electrode and the interdigital electrode-shaped transparent negative electrode are separated by the insulating area, and the side edges of the interdigital electrode-shaped transparent positive electrode and the interdigital electrode-shaped transparent negative electrode are electrically connected with the strip-shaped electrochromic areas.
5. A camera module comprising a light emitter according to any one of claims 1-4.
6. An electronic device comprising the camera module of claim 5.
7. The image three-dimensional information acquisition method is characterized by comprising the following steps of:
providing a light emitter, wherein the light emitter comprises a light emitter body and at least two electrochromic layers arranged on the light emitter body, each electrochromic layer comprises strip-shaped electrochromic areas which are arranged at equal intervals, and the strip-shaped electrochromic areas of different electrochromic layers have different widths and different intervals;
applying a voltage to each electrochromic layer to reduce the light transmittance of the electrochromic layer, or removing the applied voltage to each electrochromic layer to reduce the light transmittance of the electrochromic layer to form different gratings, wherein the provided light emitter further comprises interdigital electrodes, each electrochromic layer is provided with two interdigital electrodes respectively composed of two transparent positive electrodes and two transparent negative electrodes, and two sides of a strip-shaped electrochromic area of the electrochromic layer are respectively provided with one transparent positive electrode and one transparent negative electrode; when coloring is needed, positive voltage and negative voltage are respectively applied to the interdigital electrode formed by the positive electrode and the interdigital electrode formed by the negative electrode of the electrochromic layer; when the color is required to fade, respectively cancelling the applied positive voltage and negative voltage for the interdigital electrode formed by the positive electrode and the interdigital electrode formed by the negative electrode of the electrochromic layer;
controlling the light emitter body to emit light, and generating a stripe pattern to project the light emitted by the light emitter body to the surface of an object after passing through different gratings;
images are acquired that are generated through different gratings to generate three-dimensional information of the object.
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| CN103033996A (en) * | 2012-12-14 | 2013-04-10 | 京东方科技集团股份有限公司 | Active grating, manufacturing method thereof, display device and active shutter glasses |
| CN104656321A (en) * | 2013-11-25 | 2015-05-27 | 深圳市亿思达科技集团有限公司 | Dynamic grating device |
| CN203672335U (en) * | 2013-12-20 | 2014-06-25 | 上海瑞立柯信息技术有限公司 | Programmable-control grating projection device |
| CN104123038A (en) * | 2014-07-08 | 2014-10-29 | 京东方科技集团股份有限公司 | Touch type three-dimensional grating and display device |
| CN104238223A (en) * | 2014-07-09 | 2014-12-24 | 京东方科技集团股份有限公司 | Electrochromic grating, preparing method of electrochromic grating and 3D (three-dimensional) display device |
| CN104122671A (en) * | 2014-07-10 | 2014-10-29 | 京东方科技集团股份有限公司 | Three-dimensional display device |
| WO2016123955A1 (en) * | 2015-02-06 | 2016-08-11 | 京东方科技集团股份有限公司 | Electrochromic grating, display panel, and display device |
| CN107024850A (en) * | 2017-05-26 | 2017-08-08 | 清华大学 | High-speed structures light 3-D imaging system |
| CN109341589A (en) * | 2018-10-17 | 2019-02-15 | 深圳市华汉伟业科技有限公司 | A kind of raster image projecting method, three-dimensional rebuilding method and three-dimensional reconstruction system |
| CN109451106A (en) * | 2018-11-16 | 2019-03-08 | Oppo广东移动通信有限公司 | Electronic device |
| CN109900222A (en) * | 2019-04-18 | 2019-06-18 | 盎锐（上海）信息科技有限公司 | Model acquisition methods and device based on projection grating modeling |
| CN110633695A (en) * | 2019-09-29 | 2019-12-31 | 京东方科技集团股份有限公司 | Line identification module and display device |
| CN111045279A (en) * | 2019-12-30 | 2020-04-21 | 维沃移动通信有限公司 | Flash lamp light supplementing method and electronic equipment |
| CN111487831A (en) * | 2020-06-11 | 2020-08-04 | 江西沃格光电股份有限公司 | Electrochromic projection screen, projection curtain wall and projection equipment |
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