CN104991432A - Method for adjusting laser display brightness - Google Patents
Method for adjusting laser display brightness Download PDFInfo
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- CN104991432A CN104991432A CN201510442714.2A CN201510442714A CN104991432A CN 104991432 A CN104991432 A CN 104991432A CN 201510442714 A CN201510442714 A CN 201510442714A CN 104991432 A CN104991432 A CN 104991432A
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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
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
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- Optics & Photonics (AREA)
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- Projection Apparatus (AREA)
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Abstract
The invention discloses a method for adjusting the laser display brightness. The method comprises the following steps: detecting the external environment parameter change by a detection module; receiving the information from the detection module by the area control part of a control center, calculating the projection area, and sending the calculation result to the optical power control part of the control center so as to calculate the current optical power. The optical power control part of the control center can judge the calculated optical power according to the received surface information and external illumination intensity under the assistance of an algorithm flow chart so as to achieve a comfortable luminance ratio and a safe luminance value. A laser source power control module can control the optical power of the laser source according to the command from the control center so as to output reasonable brightness. The projection method can detect the environment brightness by a detection module, and automatically adjust the laser brightness output so as to make people obtain a clear and bright feeling. Moreover, the brightness can be rapidly adjusted according to the size of a screen, at the same time, the optical power is controlled in a safe range, and the method is convenient and fast.
Description
Technical field
The control method of laser display brightness, belongs to display technique field, relates to a kind of control method of laser display brightness, can be applicable to laser projection.
Background technology
The white and black displays of rising from 19 end of the centurys is come out to nineteen twenty-eight color TV and nineteen thirty-five realizes the color film of film photographic, but the epoch that display technique experienced by from black and white to color display technology cross over. the color rendition ability of existing display is very low, its color range only can cover 33% of the color space that human eye can be observed, and other color spaces of 67% are digital display technique and present existing display technique all cannot reappear the direction that must become display technique research and development from now on. an important thinking of laser display technology considers from colorimetry, with red, green, blue three primary colours (RGB) laser is the display technique of light source, objective world can be reproduced the most truly enrich, gorgeous color, the expressive force having more shock is provided.Research finds, relative to the absolute value of brightness, human eye is more responsive for the contrast of brightness.Brightness ratio within the vision more and more becomes the leading indicator evaluating visual comfort, about the value of optimal brightness ratio, Illuminating Enginering Society ofNorthAmerica (IESNA) gives recommendation for brightness ratio.Brightness ratio between workplace and adjacent area is 3:1 or 1:3.Practice shows, the mood of projection brightness to people has a certain impact.People is too secretly made to produce sense of depression, depressed; Cross the bright people's mood that easily makes impetuous, spirit is indefinite, simultaneously too dark or too brightly all can cause damage to eyesight.Laser projection exists that Output optical power is too high causes brightness excessive, the problem that temperature is too high.Laser belongs to high polymerization light, concentration of energy, and brightness is high, if but Output optical power is not controlled, then the image color shown in laser display system, by too saturated even colour cast, easily allows eyes be stabbed by light, cause eye fatigue, even cause the problem such as visual impairment and headache.Therefore according to the performance of existing environment and equipment, by the calculating of science, the projection brightness under ambient lighting and projection size are reasonably set, best projection effect can be obtained, be i.e. soft bright and image clearly.
The vision-control method that this method provides has the following advantages:
1. laser has very high luminous power output, and its high brightness can be easy to realize large-size screen monitors projection; Simultaneously laser frequency of light wave is single, and transmission path is parallel and can not disperse, and this makes laser projection be the good selection of 3D projection.
2. the spectrum of laser is line spectrum, the color itself manifested is spectrum colour, and laser has wavelength selectable selects and the features such as EO-1 hyperion brightness, therefore the triangle color gamut space formed as the three primary colours of light source with red, green, blue three look laser instrument is larger, and there is very high color saturation, more than 90% of the color space that human eye can identify can be covered.
3. this projecting method can by the brightness of detection module testing environment, and regulate laser brightness to export automatically, and the brightness ratio making projection and environment is 3:1, makes human eye obtain brightness sensation clearly.
4. the present invention calculates rational brightness simultaneously by the Output optical power of laser light source power control module intelligent control semiconductor laser by control center, project suitable brightness according to different projection screen sizes, thus met the display effect of eye-safe most.
Summary of the invention
The object of the invention is to by detection module, control center and laser light source power control module are combined, the parameter such as external environment condition and distance is gone out by monitoring module monitors, by calculating appropriate Output optical power, thus met the brightness of eye-safe most.
For achieving the above object, the invention provides a kind of control method of laser display brightness, the method realizes based on laser display brightness regulating structure, and this adjustment comprises projection laser light source, retractable lens, detection module, control center and laser light source power control module;
Described retractable lens does not need regulate projector position and directly regulate projection focal length, changes projected area.
Described detection module comprises light sensor, laser range finder and angle detection module.Wherein light sensor detects the brightness change of external environment condition in real time; Laser range finder detects the distance of projector and projection screen; Angle detection module is connected with retractable lens, detects the change of projection angle in real time.
Described control center comprises Area processing and laser optical power process two parts.Area processing part is connected with the laser range finder in detection module and angle detection module, receives real-time Distance geometry angle information, by calculating projected area.Area processing part is connected with retractable lens simultaneously, according to user's request, in conjunction with the projector distance measured, arranges projection angle, thus controls projected size.Laser optical power processing section is connected with the light sensor in Area processing part and detection module, judges, calculate optimal projected light power to the security of projection brightness and comfortableness.
Described laser optical power control module is connected with the laser optical power processing section of control center, receives control center to the instruction of luminous power, by exporting the regulable control luminous power of working current.
Described projection laser light source is connected with laser optical power control module, comprise red semiconductor laser, green semiconductor laser, blue semiconductor laser, these three kinds of semiconductor laser light resources are after the mixing of different proportion, produce laser image, its power efficiency is known, luminous power becomes positive correlation with working current, changes its Output optical power by the adjustment of laser optical power control module to working current, thus changes output image projection brightness.
Projection laser light source is semiconductor laser light source.
Detection module can monitor out outside ambient brightness, the Parameters variation such as camera lens and screen distance.
Control center receives the parameter information from monitoring modular, by calculating the luminous power size that export.
Laser light source power control module controls the luminous power of projection laser light source according to the instruction of control center, thus exports rational brightness.
Compared with prior art, the present invention has following beneficial effect.
1, the control method of this laser display brightness provided by the invention, principle is simple, cost is low.
2, this projecting method can by the brightness of detection module testing environment, and regulate laser brightness to export automatically, makes projection brightness and ambient brightness than higher than minimum comfortable brightness ratio 3:1, makes human eye obtain brightness sensation clearly.
3, the control method of this laser display brightness provided by the invention, can according to screen size change quick adjustment brightness, simultaneously automatic by optical power control in safe range, efficient and convenient.
4, the control method of this laser display brightness provided by the invention, can utilize the advantage of laser projection to realize 3D, large-size screen monitors projection.
Accompanying drawing explanation
Fig. 1: the control method basic block diagram of laser display brightness provided by the invention;
Fig. 2: the control method projected side view of laser display brightness provided by the invention;
Fig. 3: the control method projection vertical view of laser display brightness provided by the invention;
Fig. 4: the control method projection front elevation of laser display brightness provided by the invention;
Fig. 5: the control method brightness of laser display brightness provided by the invention is with the self-adjusting method flow diagram of area change;
In figure: 1, retractable lens, 2, light sensor, 3, screen, 4, laser range finder.
Embodiment
In order to make the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
The control method of laser display brightness provided by the invention, is widely used in various laser projection and laser TV system, for laser-projector, its principle is described below.
As shown in the figure, be the control method of laser display brightness provided by the invention, the method comprises with lower part,
Step 101: detection module detects external environment condition illumination intensity E, projector distance (i.e. the distance of projection lens and screen) l, the projective parameter changes such as projection elevation angle α and horizontal angle beta.
Step 102: the area control part of control center receives external environment condition illumination intensity E, the distance l of self-detection module, initial projection elevation angle α and horizontal angle beta information, by calculating projected area, sending optical power control part to thus calculating current luminous power size.
Step 103: the optical power control part of control center is according to the area information received and external environment condition illumination intensity, and combination algorithm process flow diagram judges calculating luminous power, makes it meet the brightness value of comfortable brightness ratio and safety simultaneously.
Step 104: laser light source power control module controls the luminous power of projection laser light source according to the instruction of control center, thus exports rational brightness.
For the control method of the laser display brightness that the invention described above provides, below in conjunction with the basic block diagram of the control method of laser display brightness, the present invention is described in more detail.
Described in above-mentioned steps 101, detection module as shown in Figure 1, is made up of three parts, and Part I is laser range finder (4), detects the distance l of projection lens and screen; Part II is that angle detection is divided, according to angle of elevation alpha and horizontal angle beta that projection detected as shown in Figure 2 and Figure 3 according to the focal length variations of retractable lens (1); Part III is light sensor (2), detects external environment condition illumination E.
Above-mentioned steps 102 comprises: receive the parameter information of self-detection module and the distance l of projection lens and screen, ambient light illumination E in control center.After projector Installation and Debugging, the initial elevation α of projection, the initial value of horizontal angle beta is given, if the width of projection in zone is w, be highly h, projection in zone diagonal line (being called projection size) is c, and the unit of three is m.Then there is h=l × tan α, w=2l × tan β.Then projection in zone area is S=h × w=2l tan α tan β, according to the brightness-formula of projector
Formula (1) is exactly the relational expression of projector's brightness and ambient lighting, relative exposure and projection size, wherein C
rfor the contrast factor of display object (word, figure, image etc.), P is the gain coefficient conventional 3.0 of screen.Control center calculates the power of projector according to the relational expression of formula (1) and laser-projector power and projection brightness.
The contrast rating of table 1 display object (word, figure, image etc.)
Above-mentioned steps 103 comprises: need control center can control the flexible of camera lens according to user and change projection focal length, thus change the angle of elevation alpha of projection, the value of horizontal angle beta changes projected area, simultaneously detection module detect new angle of elevation alpha ', horizontal angle beta ' value feed back to the Area processing part of control center, control center calculates the area value made new advances
S'＝h'×w'＝2l
2tanα'tanβ'
Then the luminous power that the areal calculation that the laser power processing section utilization of control center is gone makes new advances, then whether power is judged within the scope of safety value, as shown in process flow diagram 5, when area increases, luminous power increases, judging whether it exceedes the receptible high-high brightness of human eye, during as being greater than higher limit, reducing luminous power; When area reduces, luminous power reduces, and judges whether its projection brightness and ambient brightness are less than optimal brightness than 3:1, if be less than this ratio, suitably heighten luminous power.
Above-mentioned steps 104: laser light source power control module controls the luminous power of projection laser light source according to the instruction of control center, the luminous power formula of laser instrument according to determining power efficiency: P
em=η
p(IV+I
2r
s) control conciliation is carried out to the LASER Light Source electric current of projector, change light-source brightness, thus export rational brightness.
Above-described specific embodiment; further detailed description has been carried out to object of the present invention, technical scheme and beneficial effect; should be understood that; the foregoing is only embodiments of the invention, be not limited to the present invention, within the spirit and principles in the present invention all; any amendment of making; equivalent replacement, improves, all should within scope.
Claims (6)
1. a control method for laser display brightness, is characterized in that: this method comprises the following steps,
Step 101: detection module detects external environment condition illumination intensity E, projector distance (i.e. the distance of projection lens and screen) l, the projective parameter changes such as projection elevation angle α and horizontal angle beta;
Step 102: the area control part of control center receives external environment condition illumination intensity E, the distance l of self-detection module, initial projection elevation angle α and horizontal angle beta information, by calculating projected area, sending optical power control part to thus calculating current luminous power size;
Step 103: the optical power control part of control center is according to the area information received and external environment condition illumination intensity, and combination algorithm process flow diagram judges calculating luminous power, makes it meet the brightness value of comfortable brightness ratio and safety simultaneously;
Step 104: laser light source power control module controls the luminous power of projection laser light source according to the instruction of control center, thus exports rational brightness;
Described in above-mentioned steps 101, detection module is made up of three parts, and Part I is laser range finder (4), detects the distance l of projection lens and screen; Part II is that angle detection is divided, and angle of elevation alpha and the horizontal angle beta of projection detected according to the focal length variations of retractable lens (1); Part III is light sensor (2), detects external environment condition illumination E;
Above-mentioned steps 102 comprises: receive the parameter information of self-detection module and the distance l of projection lens and screen, ambient light illumination E in control center; After projector Installation and Debugging, the initial elevation α of projection, the initial value of horizontal angle beta is given, if the width of projection in zone is w, be highly h, projection in zone diagonal line is c, and the unit of three is m; Then there is h=l × tan α, w=2l × tan β; Then projection in zone area is S=h × w=2ltan α tan β, according to the brightness-formula of projector
The contrast rating of table 1 display object (word, figure, image etc.)
Above-mentioned steps 103 comprises: need control center can control the flexible of camera lens according to user and change projection focal length, thus change the angle of elevation alpha of projection, the value of horizontal angle beta changes projected area, simultaneously detection module detect new angle of elevation alpha ', horizontal angle beta ' value feed back to the Area processing part of control center, control center calculates the area value made new advances
S'＝h'×w'＝2l
2tanα'tanβ'
Then the luminous power that the areal calculation that the laser power processing section utilization of control center is gone makes new advances, then whether power is judged within the scope of safety value, when area increases, luminous power increases, judge whether it exceedes the receptible high-high brightness of human eye, during as being greater than higher limit, reduce luminous power; When area reduces, luminous power reduces, and judges whether its projection brightness and ambient brightness are less than optimal brightness than 3:1, if be less than this ratio, suitably heighten luminous power;
Above-mentioned steps 104: laser light source power control module controls the luminous power of projection laser light source according to the instruction of control center, the luminous power formula of laser instrument according to determining power efficiency: P
em=η
p(IV+I
2r
s) control conciliation is carried out to the LASER Light Source electric current of projector, change light-source brightness, thus export rational brightness.
2. an adjustment structure for laser display brightness, is characterized in that: this adjustment structure comprises projection laser light source, retractable lens, detection module, control center and laser light source power control module;
Described retractable lens does not need regulate projector position and directly regulate projection focal length, changes projected area;
Described detection module comprises light sensor, laser range finder and angle detection module; Wherein light sensor detects the brightness change of external environment condition in real time; Laser range finder detects the distance of projector and projection screen; Angle detection module is connected with retractable lens, detects the change of projection angle in real time;
Described control center comprises Area processing and laser optical power process two parts; Area processing part is connected with the laser range finder in detection module and angle detection module, receives real-time Distance geometry angle information, by calculating projected area; Area processing part is connected with retractable lens simultaneously, according to user's request, in conjunction with the projector distance measured, arranges projection angle, thus controls projected size; Laser optical power processing section is connected with the light sensor in Area processing part and detection module, judges, calculate optimal projected light power to the security of projection brightness and comfortableness;
Described laser optical power control module is connected with the laser optical power processing section of control center, receives control center to the instruction of luminous power, by exporting the regulable control luminous power of working current;
Described projection laser light source is connected with laser optical power control module, comprise red semiconductor laser, green semiconductor laser, blue semiconductor laser, these three kinds of semiconductor laser light resources are after the mixing of different proportion, produce laser image, its power efficiency is known, luminous power becomes positive correlation with working current, changes its Output optical power by the adjustment of laser optical power control module to working current, thus changes output image projection brightness.
3. the adjustment structure of a kind of laser display brightness according to claim 2, is characterized in that: projection laser light source is semiconductor laser light source.
4. the adjustment structure of a kind of laser display brightness according to claim 2, is characterized in that: detection module can monitor out outside ambient brightness, the Parameters variation such as camera lens and screen distance.
5. the adjustment structure of a kind of laser display brightness according to claim 2, is characterized in that: control center receives the parameter information from monitoring modular, by calculating the luminous power size that export.
6. the adjustment structure of a kind of laser display brightness according to claim 2, is characterized in that: laser light source power control module controls the luminous power of projection laser light source according to the instruction of control center, thus exports rational brightness.
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| CN106610314A (en) * | 2015-12-31 | 2017-05-03 | 北京数科技有限公司 | Color detection method and device |
| CN106612421A (en) * | 2015-12-31 | 2017-05-03 | 北京数科技有限公司 | Method and device for adjusting projection brightness |
| CN108008399A (en) * | 2016-10-28 | 2018-05-08 | 江苏徕兹测控科技有限公司 | A kind of hand-held laser ranging system and its method |
| CN108600714A (en) * | 2018-03-29 | 2018-09-28 | 联想(北京)有限公司 | A kind of method for controlling projection and electronic system |
| CN108806681A (en) * | 2018-05-28 | 2018-11-13 | 江西午诺科技有限公司 | Sound control method, device, readable storage medium storing program for executing and projection device |
| CN108844627A (en) * | 2018-06-15 | 2018-11-20 | Oppo广东移动通信有限公司 | Laser testing method and electronic equipment for eye-safe |
| CN108957927A (en) * | 2018-07-19 | 2018-12-07 | 苏州博学智能科技有限公司 | A kind of office projection instrument |
| CN109409015A (en) * | 2018-12-11 | 2019-03-01 | 海南大学 | Space representation system self-adaption adjusting and optimizing method |
| CN110694184A (en) * | 2019-10-14 | 2020-01-17 | 深圳大学 | Laser power density adjusting method and device and storage medium |
| CN112104860A (en) * | 2020-08-18 | 2020-12-18 | 欧菲微电子技术有限公司 | Calibration method, calibration device, computer device and readable storage medium |
| CN112289277A (en) * | 2020-10-27 | 2021-01-29 | 上海熙业信息科技有限公司 | Mobile medical electronic equipment screen brightness adjusting system and method |
| CN112995630A (en) * | 2021-03-11 | 2021-06-18 | 杭州当贝网络科技有限公司 | Flexible brightness adjusting method for fixed-focus projector, projector and readable storage medium |
| CN114428538A (en) * | 2022-04-06 | 2022-05-03 | 深圳市德航智能技术有限公司 | Industrial tablet computer capable of automatically adjusting brightness |
| CN114979595A (en) * | 2022-05-20 | 2022-08-30 | 武汉辰鑫禾奕文化传播有限公司 | Projection intelligent regulation and control system based on artificial intelligence and digitization |
| CN115218879A (en) * | 2022-08-02 | 2022-10-21 | 扬州翎途智能科技有限公司 | Remote control platform of laser level meter |
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| CN108600714A (en) * | 2018-03-29 | 2018-09-28 | 联想(北京)有限公司 | A kind of method for controlling projection and electronic system |
| CN108806681A (en) * | 2018-05-28 | 2018-11-13 | 江西午诺科技有限公司 | Sound control method, device, readable storage medium storing program for executing and projection device |
| CN108844627B (en) * | 2018-06-15 | 2020-04-10 | Oppo广东移动通信有限公司 | Laser testing method for human eye safety and electronic equipment |
| CN108844627A (en) * | 2018-06-15 | 2018-11-20 | Oppo广东移动通信有限公司 | Laser testing method and electronic equipment for eye-safe |
| CN108957927A (en) * | 2018-07-19 | 2018-12-07 | 苏州博学智能科技有限公司 | A kind of office projection instrument |
| CN109409015A (en) * | 2018-12-11 | 2019-03-01 | 海南大学 | Space representation system self-adaption adjusting and optimizing method |
| CN110694184A (en) * | 2019-10-14 | 2020-01-17 | 深圳大学 | Laser power density adjusting method and device and storage medium |
| CN112104860A (en) * | 2020-08-18 | 2020-12-18 | 欧菲微电子技术有限公司 | Calibration method, calibration device, computer device and readable storage medium |
| CN112104860B (en) * | 2020-08-18 | 2022-07-08 | 江西欧迈斯微电子有限公司 | Calibration method, calibration device, computer device and readable storage medium |
| CN112289277A (en) * | 2020-10-27 | 2021-01-29 | 上海熙业信息科技有限公司 | Mobile medical electronic equipment screen brightness adjusting system and method |
| CN112995630A (en) * | 2021-03-11 | 2021-06-18 | 杭州当贝网络科技有限公司 | Flexible brightness adjusting method for fixed-focus projector, projector and readable storage medium |
| CN114428538A (en) * | 2022-04-06 | 2022-05-03 | 深圳市德航智能技术有限公司 | Industrial tablet computer capable of automatically adjusting brightness |
| CN114979595A (en) * | 2022-05-20 | 2022-08-30 | 武汉辰鑫禾奕文化传播有限公司 | Projection intelligent regulation and control system based on artificial intelligence and digitization |
| CN115218879A (en) * | 2022-08-02 | 2022-10-21 | 扬州翎途智能科技有限公司 | Remote control platform of laser level meter |
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