CN113934093B - Projection system and picture brightness adjusting method - Google Patents
Projection system and picture brightness adjusting method Download PDFInfo
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- CN113934093B CN113934093B CN202010615588.7A CN202010615588A CN113934093B CN 113934093 B CN113934093 B CN 113934093B CN 202010615588 A CN202010615588 A CN 202010615588A CN 113934093 B CN113934093 B CN 113934093B
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2053—Intensity control of illuminating light
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/208—Homogenising, shaping of the illumination light
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Abstract
The invention provides a projection system and a method for adjusting the brightness of a picture, which comprises the following steps: the light regulator is used for carrying out directional reflection on the light emitted by the light source generator to obtain first reflected light and second reflected light, and the first reflected light can enter the projection lens for imaging; the detector is arranged in the propagation direction of the second reflected light and is used for detecting the power of the second reflected light and transmitting the detected power to the light source controller; the light source controller is connected with the detector, and is used for receiving the power sent by the detector, determining the target power of the light source based on the power, and controlling the light source generator to emit light with the target power. In the projection system, the power of the light emitted by the light source generator is adjustable, when a low-brightness picture is output, the power of the light emitted by the light source generator can be reduced, so that the utilization rate of the light source is improved, and the adjustment of the picture brightness can be realized by adjusting the power of the light emitted by the light source generator.
Description
Technical Field
The present invention relates to the field of projection technologies, and in particular, to a projection system and a method for adjusting brightness of a picture.
Background
The DLP (Digital Light Procession, digital light processing) projection system modulates input light by a micro-mirror array, and then images the input light by a projection lens to output a picture.
As shown in fig. 1, a conventional DLP projection system generally uses a light source that is uniformly illuminated on a light modulator after being processed by an illumination system. Since the DMD (Digital Micromirror Device ) is composed of a plurality of array mirrors, each mirror corresponds to a pixel, and each mirror is flipped in a fixed direction at a fixed angle. When the mirror is flipped to the "on" position, light incident on this reflective pixel is reflected into the lens, participating in the imaging of the picture, referred to as useful light. When the reflector is turned to the off position, light incident on the reflective pixel point can exit from another angle and cannot enter the lens to participate in imaging, so that the imaging is called waste light, and the sum of the waste light and the useful light is a fixed value.
The amount of useful light is determined by the picture to be displayed, and when the picture to be displayed is full white, most of light incident on the DMD enters the lens, and when the picture to be displayed is a gray picture or a dark picture, most of light cannot enter the lens. In this process, the light output brightness of the light source is always constant, which causes a problem that when the picture is always a low brightness picture output, the light emitted from the light source becomes substantially no light, resulting in a great waste, i.e., a low utilization rate of the light source.
In summary, the existing projection system has the problem of low light source utilization rate.
Disclosure of Invention
Accordingly, an objective of the present invention is to provide a projection system and a method for adjusting brightness of a screen, so as to alleviate the technical problem of low light source utilization rate of the existing projection system.
In a first aspect, an embodiment of the present invention provides a projection system, including: the device comprises a light source generator, a light adjuster, a projection lens, a detector and a light source controller;
the light regulator is used for carrying out directional reflection on the light emitted by the light source generator to obtain first reflected light and second reflected light, wherein the first reflected light can enter the projection lens for imaging;
the detector is arranged in the propagation direction of the second reflected light, and is used for detecting the power of the second reflected light and transmitting the detected power to the light source controller;
the light source controller is connected with the detector, and is used for receiving the power sent by the detector, determining the target power of the light source based on the power, and controlling the light source generator to emit light with the target power.
Further, the method further comprises the following steps: a beam shaping system;
the beam shaping system is arranged in the propagation direction of the second reflected light, and is positioned in front of the detector and used for shaping the second reflected light so that the shaped second reflected light reaches the detector.
Further, the beam shaping system includes: a convergence system;
the converging system is used for converging the second reflected light to the detector.
Further, the beam shaping system includes: an imaging system;
the imaging system is used for imaging the optical exit pupil of the second reflected light to the detector.
Further, the method further comprises the following steps: a matting element;
the extinction element is arranged between the beam shaping system and the detector and is used for carrying out extinction treatment on the second reflected light after being shaped by the beam shaping system so as to enable the second reflected light after extinction to reach the detector.
Further, the light adjuster includes: an illumination system and a light modulator;
the illumination system is used for processing the light emitted by the light source generator, so that the processed light is uniformly irradiated to the light modulator;
the light modulator is used for carrying out directional reflection on the light processed by the illumination system to obtain the first reflected light and the second reflected light.
In a second aspect, an embodiment of the present invention further provides a method for adjusting brightness of a picture, which is applied to the light source controller in the projection system according to any one of the first aspect, including:
acquiring power transmitted by a detector in the projection system, wherein the power is obtained by detecting second reflected light in the projection system by the detector;
determining a target power of the light source based on the power;
and controlling a light source generator in the projection system to emit light with the target power, so that the light with the target power is regulated by a light regulator in the projection system, and then the obtained first reflected light enters a projection lens of the projection system to be imaged.
Further, determining the target power of the light source based on the power comprises:
obtaining a mapping relation between optical power and light source output power;
and determining the target power of the light source based on the power and the mapping relation.
Further, the obtaining the mapping relation between the optical power and the light source output power includes:
when the projection system is in a first working state, acquiring first power of the second reflected light sent by the detector, wherein the first working state is as follows: the light source generator emits light with maximum power, and the projection system outputs a first target picture;
when the projection system is in a second working state, acquiring second power of the second reflected light sent by the detector, wherein the second working state is as follows: the light source generator emits light with maximum power, and the projection system outputs a second target picture;
and establishing the mapping relation based on the first power and the second power.
Further, controlling a light source generator in the projection system to emit light of the target power includes:
and controlling the light source generator to emit the light with the target power by adopting a preset gradual progressive method.
In an embodiment of the present invention, the projection system includes: the device comprises a light source generator, a light adjuster, a projection lens, a detector and a light source controller; the light regulator is used for carrying out directional reflection on the light emitted by the light source generator to obtain first reflected light and second reflected light, wherein the first reflected light can enter the projection lens for imaging; the detector is arranged in the propagation direction of the second reflected light and is used for detecting the power of the second reflected light and transmitting the detected power to the light source controller; the light source controller is connected with the detector, and is used for receiving the power sent by the detector, determining the target power of the light source based on the power, and controlling the light source generator to emit light with the target power. As can be seen from the above description, in the projection system of the present invention, the power of the light emitted by the light source generator is adjustable, and when the low-brightness image is output, the power of the light emitted by the light source generator can be reduced, so that the utilization rate of the light source is improved, and the adjustment of the image brightness can be realized by adjusting the power of the light emitted by the light source generator, so that the technical problem of low light source utilization rate of the existing projection system is alleviated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an optical path of a DLP projection system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a projection system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a partial structure of a projection system according to an embodiment of the present invention;
fig. 4 is a flowchart of a method for adjusting brightness of a picture according to an embodiment of the present invention.
Icon: 11-a light source generator; 12-a light adjuster; 13-a projection lens; 14-a detector; 15-a light source controller; 16-a beam shaping system; 17-a matting element; 121-an illumination system; 122-light modulator.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
For the sake of understanding the present embodiment, a projection system disclosed in the present embodiment will be described in detail.
Embodiment one:
fig. 2 is a schematic structural view of a projection system according to an embodiment of the present invention, as shown in fig. 2, the projection system includes: a light source generator 11, a light adjuster 12, a projection lens 13, a detector 14, and a light source controller 15;
a light adjuster 12 for performing a directional reflection on the light emitted from the light source generator 11 to obtain a first reflected light and a second reflected light, wherein the first reflected light can enter the projection lens 13 for imaging;
the detector 14 is disposed in the propagation direction of the second reflected light, and is configured to detect the power of the second reflected light, and send the detected power to the light source controller 15;
the light source controller 15 is connected to the detector 14, and is configured to receive the power transmitted by the detector 14, determine a target power of the light source based on the power, and control the light source generator 11 to emit light of the target power.
In the embodiment of the present invention, after the light modulator 12 performs the directional reflection, two paths of reflected light are obtained, wherein the first reflected light can enter the projection lens 13 for imaging, so that the first reflected light can be called "useful light"; the second reflected light cannot enter the projection lens 13 to participate in imaging, so the second reflected light may be referred to as "unnecessary light".
The detector 14 is disposed in the propagation direction of the second reflected light, and is capable of detecting the power of the second reflected light, and in practical application, the detector 14 detects the average value of the power of the second reflected light of the preset number of frames, so that the preset number of frames are detected, so as to prevent flicker caused by frequent and large-scale adjustment of the frames.
The light source controller 15 includes a mapping relation between the light power and the light source output power, and after receiving the power transmitted by the detector 14, the light source controller matches the mapping relation with the power to obtain the target power of the light source. When the light source controller 15 controls the light source generator 11 to emit light of the target power, a stepwise gradual control manner is adopted, for example, the current light source generator 11 emits light with a power of 100, and the determined target power is 20, when the adjustment amplitude is greater than 20, the maximum adjustment amplitude may be set to 20 (the value is not limited in the embodiment of the present invention), so that when the adjustment is from 100 to 20, the maximum adjustment amplitude of one adjustment is 20 because the adjustment amplitude is greater than 20, and the power is 80 after one adjustment; if the next determined target power is still 20, then the power is adjusted down by 20 again and becomes 60, thus making a gradual adjustment.
It should be noted that, the mapping relationship between the optical power and the light source output power may be a linear comparison table of the optical power and the light source output power, or may be a linear function of the optical power and the light source output power, which is not limited in the embodiment of the present invention.
In an embodiment of the present invention, the projection system includes: a light source generator 11, a light adjuster 12, a projection lens 13, a detector 14, and a light source controller 15; the light adjuster 12 is configured to perform a directional reflection on the light emitted by the light source generator 11 to obtain a first reflected light and a second reflected light, where the first reflected light may enter the projection lens 13 to perform imaging; the detector 14 is disposed in the propagation direction of the second reflected light, and is configured to detect the power of the second reflected light, and send the detected power to the light source controller 15; the light source controller 15 is connected to the detector 14, and is configured to receive the power transmitted by the detector 14, determine a target power of the light source based on the power, and control the light source generator 11 to emit light of the target power. As can be seen from the above description, in the projection system of the present invention, the power of the light emitted by the light source generator 11 is adjustable, and when the low brightness image is output, the power of the light emitted by the light source generator 11 can be reduced, so that the utilization rate of the light source is improved, and the adjustment of the brightness of the image can be realized by adjusting the power of the light emitted by the light source generator 11, so that the technical problem of low light source utilization rate of the existing projection system is alleviated.
The foregoing has outlined a brief description of the projection system of the present invention and the detailed description of the invention that follows is presented.
In an alternative embodiment of the present invention, referring to fig. 3, the projection system further comprises: a beam shaping system 16;
the beam shaping system 16 is disposed in the propagation direction of the second reflected light, and the beam shaping system 16 is located in front of the detector 14 and is configured to shape the second reflected light such that the shaped second reflected light reaches the detector 14.
The inventors consider that unwanted light (i.e. the second reflected light) has a certain beam width, so that it is only partly incident on the low cost miniature detector 14, and therefore the inventors add a beam shaping system 16 in front of the detector 14.
Specifically, the beam shaping system 16 may be: a converging system for converging the second reflected light entirely to the detector 14; the beam shaping system 16 may also be: the imaging system is used for imaging the optical exit pupil of the second reflected light to the detector 14, and the detector 14 only needs to receive part of the second reflected light.
It should be noted that, the above-mentioned converging system specifically refers to an optical element having a converging function for the light beam, and the embodiment of the present invention does not specifically limit the above-mentioned converging system to examples. Similarly, the embodiment of the present invention is not limited to the above imaging system.
In an alternative embodiment of the present invention, referring to fig. 3, the projection system further comprises: a matting element 17;
an extinction element 17 is disposed between the beam shaping system 16 and the detector 14, and is configured to perform an extinction process on the second reflected light shaped by the beam shaping system 16, so that the second reflected light after extinction reaches the detector 14.
In order to avoid saturation of the detector 14, the inventors have provided an extinction element 17 between the detector 14 and the beam shaping system 16, the extinction element 17 being a partial extinction element 17, i.e. a partial extinction of the second reflected light, so that the second reflected light is attenuated and then incident on the detector 14, which ensures saturation of the detector 14 and prevents overheating of the detector 14 due to excessive light absorption, thereby resulting in a reduced service life.
In an alternative embodiment of the present invention, referring to fig. 3, the light adjuster 12 comprises: an illumination system 121 and a light modulator 122;
an illumination system 121 for processing the light emitted from the light source generator 11 so that the processed light is uniformly irradiated to the light modulator 122;
the light modulator 122 is configured to perform a directional reflection on the light processed by the illumination system 121, so as to obtain a first reflected light and a second reflected light.
Specifically, the light modulator 122 is provided with a plurality of mirrors, and the plurality of mirrors are arranged in an array, where each mirror corresponds to a pixel, and each mirror is flipped in a direction fixed by a fixed angle.
The projection system of the invention can adjust the brightness output of the light source (the light emitted by the light source generator 11) according to the brightness condition of the display picture; by adjusting the brightness of the light source, the brightness output of the dark picture is reduced. That is, the projection system of the present invention can adjust the brightness of the picture by adjusting the brightness output of the light source.
The projection system of the present invention has the following advantages:
by adjusting the power of the light emitted from the light source generator 11, the most economical operation mode in the low-brightness operation mode is realized, and the brightness of the dark picture can be reduced;
for the features of DLP, arranging the detector 14 in the direction of the non-use light (i.e., the second reflected light) can avoid interference with the imaged picture as compared to the direction of the useful light (the first reflected light).
Embodiment two:
the embodiment of the present invention also provides a method for adjusting the brightness of a picture, which is applied to the light source controller in the projection system in the first embodiment, referring to fig. 4, and includes the following steps:
step S402, obtain the power that the detector sends in the projection system.
The power is obtained by detecting second reflected light in the projection system by the detector;
specifically, the detector is disposed in a propagation direction of the second reflected light, where the second reflected light cannot enter the projection lens to participate in imaging, and may be referred to as "unwanted light", and the detector can detect the power of the second reflected light. In practical applications, the detector detects the average value of the power of the second reflected light of the preset number of frames, so that the preset number of frames are detected, so as to prevent flicker caused by frequent and large-scale adjustment of the frames.
Step S404, determining the target power of the light source based on the power.
Specifically, the light source controller includes a mapping relation between light power and light source output power, and after receiving power sent by the detector, the light source controller matches and corresponds the power with the mapping relation, so as to obtain target power of the light source.
In step S406, the light source generator in the projection system is controlled to emit light with the target power, so that the light with the target power is adjusted by the light adjuster in the projection system, and the obtained first reflected light enters the projection lens of the projection system to form an image.
Specifically, a preset gradual progressive method is adopted to control the light source generator to emit light with target power.
The method for adjusting the brightness of the picture is an adjusting method when the projection system actually works, and before the projection system actually works, the projection system needs to be started and initialized, and the process of the starting and initializing is described below.
In an alternative embodiment of the invention, determining the target power of the light source based on the power comprises:
(1) Obtaining a mapping relation between optical power and light source output power;
the specific process is as follows:
1) When the projection system is in a first working state, acquiring first power of second reflected light sent by the detector, wherein the first working state is as follows: the light source generator emits light with maximum power, and the projection system outputs a first target picture;
2) When the projection system is in a second working state, acquiring second power of second reflected light sent by the detector, wherein the second working state is as follows: the light source generator emits light with maximum power, and the projection system outputs a second target picture;
3) And establishing a mapping relation based on the first power and the second power.
Specifically, the first target picture refers to a full-white picture, and the full-white picture is a picture output when all the reflectors on the light modulator are in an open state; the second target frame is a full black frame, and the full black frame is a frame output when all the reflectors on the light modulator are in a closed state. As can be seen from the explanation of the first target frame and the second target frame, the first power is the maximum value of the second reflected light, and the second power is the minimum value of the second reflected light.
After the first power and the second power are obtained, a mapping relation between the optical power and the light source output power is established based on the first power and the second power. The mapping relationship may be a linear comparison table of the optical power and the output power of the light source, or may be a linear function of the optical power and the output power of the light source, which is not particularly limited in the embodiment of the present invention.
(2) A target power of the light source is determined based on the power and the mapping relationship.
The computer program product of the projection system and the method for adjusting the brightness of the image provided by the embodiments of the present invention includes a computer readable storage medium storing program codes, and the instructions included in the program codes may be used to execute the method described in the foregoing method embodiment, and specific implementation may refer to the method embodiment and will not be described herein.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described system and apparatus may refer to corresponding procedures in the foregoing method embodiments, which are not described herein again.
In addition, in the description of embodiments of the present invention, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
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 this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform 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, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention 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 invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (8)
1. A projection system, comprising: the device comprises a light source generator, a light adjuster, a projection lens, a detector and a light source controller;
the light regulator is used for carrying out directional reflection on the light emitted by the light source generator to obtain first reflected light and second reflected light, wherein the first reflected light needs to enter the projection lens to realize projection imaging;
the detector is arranged in the propagation direction of the second reflected light, and is used for detecting the power of the second reflected light and transmitting the detected power to the light source controller;
the light source controller is connected with the detector, and is used for receiving the power sent by the detector, determining the target power of the light source based on the power, and controlling the light source generator to emit light with the target power, wherein the determining the target power of the light source based on the power comprises the following steps:
when the projection system is in a first working state, acquiring first power of the second reflected light sent by the detector, wherein the first working state is as follows: the light source generator emits light with maximum power, and the projection system outputs a first target picture;
when the projection system is in a second working state, acquiring second power of the second reflected light sent by the detector, wherein the second working state is as follows: the light source generator emits light with maximum power, and the projection system outputs a second target picture;
establishing a mapping relation between the optical power and the light source output power based on the first power and the second power;
and determining the target power of the light source based on the power and the mapping relation.
2. The projection system of claim 1, further comprising: a beam shaping system;
the beam shaping system is arranged in the propagation direction of the second reflected light, and is positioned in front of the detector and used for shaping the second reflected light so that the shaped second reflected light reaches the detector.
3. The projection system of claim 2 wherein the beam shaping system comprises: a convergence system;
the converging system is used for converging the second reflected light to the detector.
4. The projection system of claim 2 wherein the beam shaping system comprises: an imaging system;
the imaging system is used for imaging the optical exit pupil of the second reflected light to the detector.
5. The projection system of claim 2, further comprising: a matting element;
the extinction element is arranged between the beam shaping system and the detector and is used for carrying out extinction treatment on the second reflected light after being shaped by the beam shaping system so as to enable the second reflected light after extinction to reach the detector.
6. The projection system of claim 1 wherein the light adjuster comprises: an illumination system and a light modulator;
the illumination system is used for processing the light emitted by the light source generator, so that the processed light is uniformly irradiated to the light modulator;
the light modulator is used for carrying out directional reflection on the light processed by the illumination system to obtain the first reflected light and the second reflected light.
7. A method for adjusting brightness of a picture, characterized in that the light source controller applied to the projection system according to any one of claims 1 to 6 comprises:
acquiring power transmitted by a detector in the projection system, wherein the power is obtained by detecting second reflected light in the projection system by the detector;
determining a target power of the light source based on the power;
controlling a light source generator in the projection system to emit light with the target power, so that the light with the target power is regulated by a light regulator in the projection system, and then the obtained first reflected light enters a projection lens of the projection system to be imaged;
wherein determining the target power of the light source based on the power comprises:
when the projection system is in a first working state, acquiring first power of the second reflected light sent by the detector, wherein the first working state is as follows: the light source generator emits light with maximum power, and the projection system outputs a first target picture;
when the projection system is in a second working state, acquiring second power of the second reflected light sent by the detector, wherein the second working state is as follows: the light source generator emits light with maximum power, and the projection system outputs a second target picture;
establishing a mapping relation between the optical power and the light source output power based on the first power and the second power;
and determining the target power of the light source based on the power and the mapping relation.
8. The method of claim 7, wherein controlling the light source generator in the projection system to emit the light of the target power comprises:
and controlling the light source generator to emit the light with the target power by adopting a preset gradual progressive method.
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