CN107561838B - Automatic color coordinate adjustment method, laser projector and system - Google Patents
Automatic color coordinate adjustment method, laser projector and system Download PDFInfo
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- CN107561838B CN107561838B CN201710855405.7A CN201710855405A CN107561838B CN 107561838 B CN107561838 B CN 107561838B CN 201710855405 A CN201710855405 A CN 201710855405A CN 107561838 B CN107561838 B CN 107561838B
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Abstract
The invention discloses an automatic color coordinate adjusting method, a laser projector and a system. The method comprises the following steps: acquiring a laser temperature of the laser projector; obtaining the light intensity of red light, green light and blue light of white light emitted by a laser projector; determining the central wavelengths of red light, green light and blue light emitted by the laser according to the change of the temperature of the laser; and adjusting the light intensity of one or more of the red light, the green light and the blue light according to the central wavelength of the red light, the green light and the blue light and the light intensity proportional relation of the red light, the green light and the blue light so as to enable the color coordinate of the white light emitted by the laser projector to meet the set white light color coordinate specification. According to the method, automatic color coordinate adjustment of the laser projector can be realized.
Description
Technical Field
The present invention relates to a projector, and more particularly, to an automatic color coordinate adjustment method applied to a laser projector, and a laser projector system.
Background
The conventional laser projector may shift the color coordinates of the projected light due to the fluctuation of the operation state thereof. Further, the color of the projected image is distorted, and the customer experience is not good.
Disclosure of Invention
An object of the present invention is to provide a new technical solution of an automatic color coordinate adjustment method applied to a laser projector.
According to a first aspect of the present invention, there is provided an automatic color coordinate adjustment method applied to a laser projector, comprising: acquiring a laser temperature of the laser projector; obtaining the light intensity of red light, green light and blue light of white light emitted by a laser projector; determining the central wavelengths of red light, green light and blue light emitted by the laser according to the change of the temperature of the laser; and adjusting the light intensity of one or more of the red light, the green light and the blue light according to the central wavelength of the red light, the green light and the blue light and the light intensity proportional relation of the red light, the green light and the blue light so as to enable the color coordinate of the white light emitted by the laser projector to meet the set white light color coordinate specification.
Optionally, the method further comprises measuring to obtain the corresponding relation between the laser temperature and the central wavelength of the red light, the green light and the blue light emitted by the laser.
Optionally, the method further comprises measuring to obtain the corresponding relationship between the central wavelength of the red light, the green light and the blue light emitted by the laser and the light intensity proportional relationship of the three colors of light, and the color coordinate of the white light emitted by the laser.
According to a second aspect of the present invention, there is provided a laser projector comprising a laser for emitting red, green and blue light, a beam splitter, a photodetection module, a temperature sensor and a control module; the spectroscope is used for dividing laser emitted by the laser into two parts, wherein the first part is used as a projection beam of the laser projector, and the second part is used for exciting the photoelectric detection module; the photoelectric detection module is used for measuring the light intensity of red light, green light and blue light in the laser; the temperature sensor is used for measuring the temperature of the laser projector; the control module is used for adjusting the light intensity of red light, green light and blue light emitted by the laser according to the method of the first aspect.
Optionally, the photoelectric detection module comprises a photoelectric sensor for detecting the intensity of red light, a photoelectric sensor for detecting the intensity of green light, and a photoelectric sensor for detecting the intensity of blue light.
According to a third aspect of the present invention there is provided a projector system comprising the laser projector of the second aspect of the present invention.
The inventor of the present invention finds that, in the prior art, there is no technical solution for automatically adjusting the color coordinates of white light emitted from a laser projector according to the temperature of the laser projector and the ratio of the light intensities of red light, green light and blue light in the white light emitted from the laser projector. Therefore, the technical task to be achieved or the technical problems to be solved by the present invention are never thought or anticipated by those skilled in the art, and therefore the present invention is a new technical solution.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a flowchart of an automatic color coordinate adjustment method applied to a laser projector according to an embodiment of the present invention.
Fig. 2 is an example of the relationship between the laser temperature of the laser projector and the center wavelength of blue light emitted from the laser.
Fig. 3 is a front view of a laser projector according to an embodiment of the present invention.
Fig. 4 is a top view of a substrate part of a laser projector according to an embodiment of the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Note that the light intensities of red light, green light, and blue light described in the present invention may be the light intensities of red light, green light, and blue light detected by the corresponding photoelectric detection module when the laser emits the brightest white light, or the light intensities of red light, green light, and blue light detected by the corresponding photoelectric detection module when the laser emits the white light of a specific gray scale. Depending on whether the purpose of applying the method provided by the present invention is to automatically adjust the color coordinates of the strongest white light emitted by the laser or to automatically adjust the color coordinates of a particular gray level of white light emitted by the laser.
Referring to fig. 1, the automatic color coordinate adjustment method applied to a laser projector according to the present invention includes the following steps.
In step 11, the laser temperature of the laser projector is acquired.
The temperature of the laser projector is measured by a temperature sensor.
In step 12, the intensities of red, green and blue lights of white light emitted from the laser projector are obtained.
For example, a photosensor for detecting the intensity of red light, a photosensor for detecting the intensity of green light, and a photosensor for detecting the intensity of blue light are provided to detect the intensities of these three lights in white light emitted from a laser projector.
In step 13, the central wavelengths of the red light, the green light and the blue light emitted by the laser are determined according to the change of the temperature of the laser.
The temperature of the laser projector affects the central wavelengths of the red, green and blue light emitted therefrom. In particular, it can be obtained by measurement.
Referring to fig. 2, the horizontal axis represents the wavelength of the blue light emitted from the laser, and the vertical axis represents the intensity of the blue light emitted from the laser corresponding to different wavelengths. It has been found that in this particular laser projector, the center wavelength of the blue light emitted therefrom increases as the temperature of the laser increases.
The effect of the temperature of the laser on the center wavelengths of the red and green light emitted by the laser can also be obtained through experiments.
In step 14, the light intensity of one or more of the red light, the green light and the blue light is adjusted according to the central wavelength of the red light, the green light and the blue light and the light intensity proportional relationship of the red light, the green light and the blue light, so that the color coordinate of the white light emitted by the laser projector meets the set white light color coordinate specification.
The color coordinates of the white light emitted by the laser projector are affected by the intensities of the red, green, and blue lights emitted therefrom, as well as the center wavelengths of the three lights.
For example, if the intensity of the red light emitted by the laser is too high relative to the intensity of the green and blue light, the white light emitted by the laser, or all of the light emitted by the laser as a whole, will be reddish.
Under the condition that the proportional relation of the light intensities of the red light, the green light and the blue light emitted by the laser is determined, the influence of the central wavelength deviation of the three lights on the color coordinate of the white light emitted by the laser caused by the temperature of the laser can also be measured through experiments.
Based on the above experimental data, those skilled in the art can design different strategies to adjust the proportional relationship between the intensities of the red light, the green light, and the blue light emitted by the laser when the temperature of the laser changes or the intensities of the red light, the green light, and the blue light emitted by the laser drift, so as to achieve the purpose that the color coordinate of the white light emitted by the laser is constant or kept within an allowable specification range.
Based on the above method, different laser projectors can be designed. Referring to fig. 3 and 4, the laser projector includes a laser 1 for emitting red, green and blue light, a beam splitter 2, a photo detection module 3, a temperature sensor 4, a substrate 5 and a control module (not shown in fig. 3 and 4).
The photoelectric detection module 3 and the temperature sensor 4 are disposed on the substrate 5, and the respective output electrical signals are output to the control module, so that the control module can adjust the light intensity of the red light, the green light and the blue light emitted by the laser according to the method.
The laser beam 1a emitted by the laser 1 is split into two parts by the beam splitter 2, wherein the first part 1b is emitted to the projection surface as the projection beam of the laser projector. The projection surface is for example a wall, a projection curtain, etc.; wherein the second portion 1c is used for exciting the photo detector module 3. The proportional relationship between the first portion 1b and the second portion 1c is fixed, so that the proportional relationship between the intensities of the red light, the green light and the blue light in the second portion 1c detected by the photodetection module 3 is the proportional relationship between the intensities of the red light, the green light and the blue light in the first portion 1 b.
On the substrate 5, a photosensor 3a for detecting the intensity of red light, a photosensor 3b for detecting the intensity of green light, and a photosensor 3c for detecting the intensity of blue light are provided, which together constitute the photodetection module 3.
The control module may be, for example, an FPGA, an ASIC chip, or a single chip, etc., which is configured to perform the aforementioned method when running.
The control module is, for example, formed by a memory and a processor. Wherein the memory is configured to store instructions for controlling the processor to operate to perform the automatic color coordinate adjustment method according to any one of the preceding claims.
The processor may be, for example, a central processing unit CPU, a microprocessor MCU, or the like. The memory includes, for example, a ROM (read only memory), a RAM (random access memory), a nonvolatile memory such as a hard disk, and the like.
The invention also provides a projector system comprising the laser projector. For example, a projection curtain and the like are also included in a matching way.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. It will be apparent to those skilled in the art that the above embodiments may be used alone or in combination with each other as desired. In addition, for the device embodiment, since it corresponds to the method embodiment, the description is relatively simple, and for relevant points, refer to the description of the corresponding parts of the method embodiment. The system embodiments described above are merely illustrative, in that modules illustrated as separate components may or may not be physically separate.
In addition, 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 invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The computer program product provided in the embodiment of the present invention includes a computer-readable storage medium storing a program code, where instructions included in the program code may be used to execute the method described in the foregoing method embodiment, and specific implementation may refer to the method embodiment, which is not described herein again.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope of the invention. The scope of the invention is defined by the appended claims.
Claims (5)
1. An automatic color coordinate adjustment method applied to a laser projector, comprising:
acquiring a laser temperature of the laser projector;
obtaining the light intensity of red light, green light and blue light of white light emitted by a laser projector;
determining the central wavelengths of red light, green light and blue light emitted by the laser according to the change of the temperature of the laser;
adjusting the light intensity of one or more of the red light, the green light and the blue light according to the central wavelength of the red light, the green light and the blue light and the light intensity proportional relation of the red light, the green light and the blue light so as to enable the color coordinate of the white light emitted by the laser projector to meet the set white light color coordinate specification,
the method also comprises the step of measuring to obtain the corresponding relation between the parameters and the white light color coordinate emitted by the laser, wherein the corresponding relation is obtained by the central wavelength of red light, green light and blue light emitted by the laser and the light intensity proportional relation of the three colors of light.
2. The method of claim 1,
and measuring to obtain the corresponding relation between the laser temperature and the central wavelength of the red light, the green light and the blue light emitted by the laser.
3. A laser projector is characterized in that,
the device comprises a laser for emitting red light, green light and blue light, a spectroscope, a photoelectric detection module, a temperature sensor and a control module;
the spectroscope is used for dividing laser emitted by the laser into two parts, wherein the first part is used as a projection beam of the laser projector, and the second part is used for exciting the photoelectric detection module;
the photoelectric detection module is used for measuring the light intensity of red light, green light and blue light in the laser;
the temperature sensor is used for measuring the temperature of the laser projector;
the control module is used for adjusting the light intensity of red light, green light and blue light emitted by the laser according to the method of claim 1.
4. The laser projector of claim 3,
the photoelectric detection module comprises a photoelectric sensor for detecting the light intensity of red light, a photoelectric sensor for detecting the light intensity of green light and a photoelectric sensor for detecting the light intensity of blue light.
5. A projector system characterized by comprising the laser projector of claim 3.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102650813A (en) * | 2011-11-28 | 2012-08-29 | 深圳市光峰光电技术有限公司 | Light source system, projector and color balance adjusting method of projector |
| CN103781214A (en) * | 2007-12-07 | 2014-05-07 | 奥斯兰姆有限公司 | Method and device for adjusting color location, and illumination system |
| CN105988269A (en) * | 2015-02-06 | 2016-10-05 | 深圳市绎立锐光科技开发有限公司 | Projection system, light source system, and light source control device and control method |
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| JP4240122B2 (en) * | 2007-01-23 | 2009-03-18 | セイコーエプソン株式会社 | LIGHT SOURCE DEVICE AND ITS CONTROL METHOD, LIGHTING DEVICE, MONITOR DEVICE, AND IMAGE DISPLAY DEVICE |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103781214A (en) * | 2007-12-07 | 2014-05-07 | 奥斯兰姆有限公司 | Method and device for adjusting color location, and illumination system |
| CN102650813A (en) * | 2011-11-28 | 2012-08-29 | 深圳市光峰光电技术有限公司 | Light source system, projector and color balance adjusting method of projector |
| CN105988269A (en) * | 2015-02-06 | 2016-10-05 | 深圳市绎立锐光科技开发有限公司 | Projection system, light source system, and light source control device and control method |
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Effective date of registration: 20201013 Address after: 261031 north of Yuqing street, east of Dongming Road, high tech Zone, Weifang City, Shandong Province (Room 502, Geer electronic office building) Patentee after: GoerTek Optical Technology Co.,Ltd. Address before: 261031 Dongfang Road, Weifang high tech Development Zone, Shandong, China, No. 268 Patentee before: GOERTEK Inc. |