CN1991571A - Luminance self-adjusting projector and method thereof - Google Patents
Luminance self-adjusting projector and method thereof Download PDFInfo
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- CN1991571A CN1991571A CNA2005101329445A CN200510132944A CN1991571A CN 1991571 A CN1991571 A CN 1991571A CN A2005101329445 A CNA2005101329445 A CN A2005101329445A CN 200510132944 A CN200510132944 A CN 200510132944A CN 1991571 A CN1991571 A CN 1991571A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
Abstract
The invention discloses a projector that can auto adjust the brightness and a method for adjusting the brightness automatically, said system includes center control module, lamp bulb of projector, display drive module, optical system, detection module and bulb power control module; the detection module is used to detect the parameters of the projecting image data; said center control module calculate the brightness of projector according to the parameters of the projecting image data; and said bulb power control module adjust the output power of bulb according to the brightness calculated by the center control module. Said method is: the projector detects the parameters of projecting images; the brightness of projector is calculated according to the parameters by the projector; and the projector projects according to the brightness.
Description
Technical field
The present invention relates to a kind of projector, relate in particular to a kind of can realize regulating the automatically projector of brightness and the method for regulating projector's brightness automatically.
Background technology
Development of science and technology is applied in production, the life various novel electronic equipment, and projector is applied in teaching, meeting, the home theater widely as a kind of large-scale demonstration output device.
The performance of projector mainly is presented as its luminance index, and for adapting to the variation of projection ambient brightness, projector is provided with brightness control function, by the brightness of manual adjustments projector, obtains best drop shadow effect.
For projector, the bulb brightness of projector is high more, and its inner heat that produces is big more, and temperature is high more, and simultaneously, in order to strengthen radiating effect, the rotation speed of the fan in the projector also increases thereupon, and it is big that noise becomes, and these have all influenced the life-span of projector.
In the method that adopts the brightness of manual adjustments projector, essence is to regulate the brightness of projector's display image by the image intensity signal of control projector, do not regulate the brightness of projecting camera light bulb, when reducing projector's brightness, because the power of bulb does not change, and reduce with the energy that the mode of luminous energy is left projector's internal body, make the energy of staying projector's internal body increase on the contrary, can influence the life-span of projector more.
A kind of like this projector has appearred at present, in this projector, be provided with two kinds of mode of operations, be general mode and energy saver mode, reduce the brightness of projector by the mode that reduces projecting camera light bulb power, the mode of this adjusting brightness only is provided with two duties to bulb, though solved the problem of heat accumulation in the projector to a certain extent, but can not satisfy various use occasion, and, this projector needs manual adjustments, and is not accurate enough to the adjusting of projector's brightness.
Summary of the invention
The invention provides a kind of method that can regulate the projector of brightness automatically and regulate brightness automatically, obtain satisfied projector's brightness by adjusting to the projecting camera light bulb output power.
Projector of the present invention comprises Central Control Module, projecting camera light bulb, driver module, optical system, also increases to be provided with bulb power control module and detection module;
Described detection module is used for the parameter of projected image is detected;
Described Central Control Module goes out projector's brightness value according to the detected projected image calculation of parameter of detection module;
The brightness value that described bulb power control module is calculated according to Central Control Module, the output power of regulating projecting camera light bulb.
The parameter of the projected image that above-mentioned detection module detects can be ambient brightness and projection screen distance, also can be the contrast of projected image.
Above-mentioned Central Control Module calculates projector's brightness value of current correspondence according to ambient brightness and projection screen range data that detection module detects.
Above-mentioned Central Control Module calculates projector's brightness value of current correspondence according to the contrast-data that detection module detects.
The present invention also provides the method for a kind of automatic adjusting projector brightness, and step comprises:
Step 1, the parameter of current reference projection images detects in projector;
Step 2, projector goes out the brightness value of projector's correspondence according to above-mentioned detected calculation of parameter;
Step 3, projector carries out projection by above-mentioned brightness value.
In the above-mentioned steps one, the parameter of the reference projection images that projector is detected can also can be the contrast of reference picture for reference picture current ambient brightness and projection screen distance.
The present invention detects the parameter of projector's projected image by detection module is set, again by the projected image calculation of parameter of Central Control Module to detecting, thereby select suitable projector's brightness value in conjunction with result of calculation, and regulate the brightness of projecting camera light bulb by this projector's brightness value by the bulb power control module, obtain suitable projector's brightness with this.The present invention can realize step-less adjustment to the power of projecting camera light bulb, is applicable to various projection occasions.
Description of drawings
Fig. 1 is a projector architecture synoptic diagram of the present invention;
Fig. 2 is the another kind of structural representation of projector of the present invention;
Fig. 3 is the another kind of structural representation of projector of the present invention;
Fig. 4 is the method flow diagram of automatic adjusting of the present invention projector brightness.
Embodiment
Fixing corresponding relation is arranged between the projection brightness of the contrast of projector, ambient brightness, projector, when the output brightness of projector is constant, if ambient brightness increases, then the contrast of projector's projection will reduce, influence drop shadow effect, therefore, has only the increase projection brightness, the contrast of raising projection that could be suitable; When ambient brightness is low, do not need the brightness of projector very high, also can obtain proper contrast, at this moment, just need to reduce the brightness of projector.
The present invention is by the flexible to projector's brightness, thus the satisfied contrast of acquisition.
The present invention will be further described below in conjunction with Figure of description.
Shown in Figure of description 1, projector of the present invention comprises Central Control Module, projecting camera light bulb, driver module, optical system, also comprises bulb power control module and detection module;
Described detection module is used for the parameter of projected image is detected;
Described Central Control Module goes out projector's brightness value according to the detected projected image calculation of parameter of detection module;
Described bulb power control module is regulated the output power of projecting camera light bulb according to projector's brightness value that Central Control Module sends, and changes the brightness of projecting camera light bulb; Connect with serial ports between this bulb power control module and the Central Control Module, after Central Control Module calculates the brightness value that needs, send to the bulb power control module by serial ports, the bulb power control module is set the electric current that passes through the projecting camera light bulb apparatus for lighting up according to this brightness value, thereby realizes the control to projecting camera light bulb power;
Described projecting camera light bulb adopts the bulb that can regulate power continuously, and this bulb changes output power under the control of bulb power control module, and then regulates the projection brightness of projector;
Described driver module comes Projection Display with the picture signal of external image input by the optical system of projector under the control of Central Control Module;
Described power supply provides working power for projector's total system.
Among the present invention, projector is after the parameter to projected image detects, calculate suitable projector's brightness value, in the process that the parameter to projected image detects, two kinds of situations have been comprised, be depicted as first kind of situation as Figure of description 2, what detect at detection module in such cases is ambient brightness and projection screen distance, and promptly detection module can specifically be divided into environment measuring module and projector distance detection module;
Described ambient brightness detection module is used for projector's ambient brightness of living in is detected, this module is made of a luminance sensor, described luminance sensor with the residing ambient brightness signals collecting of projector after, input to the Central Control Module in the projector, Central Control Module receives the luminance signal that luminance sensor is gathered, obtaining the residing ambient brightness value of projector after calculating, also is the ambient brightness value of projection screen, and for example Ci Shi ambient brightness value is 300 lumens;
Described projector distance detection module is used to detect the distance between projector and the projection screen, this module comprises a microfilming unit, this microfilming unit can be a micro-camera, produce a reference picture by projector's projection on projection screen, by the microfilming unit this reference picture is taken, this reference picture that photographs and pre-stored image are compared, can calculate the projection screen at reference picture place and the distance between the projector, and this distance value sent to Central Control Module, above-mentioned reference picture for the projection screen at projector known distance place on the image that produces, for example, the pre-stored image size is 0.5 meter on the projection screen at 1 meter of known distance projector, the size that now records reference picture is 1 meter, and the distance that then can calculate between front projection screen and projector is 2 meters;
Ambient brightness value that described Central Control Module utilization obtains and projection screen distance, calculate projector's brightness value of current needs, and the projector's brightness value that calculates sent to the bulb power control module, as having provided ambient brightness in the table 1, the projection screen distance, corresponding relation between projector's brightness, wherein the projection screen parasang is a rice, projector's brill is a lumen, ambient brightness unit is a lumen, as working as ambient brightness is 100 lumens, when the projection screen distance was 7 meters, Central Control Module calculated projector's brightness according to the corresponding relation in the table 1 and should be 1800 lumens;
Table 1
The drop shadow effect of projector is decided by contrast, contrast is high more, projected image is clear more, after detecting current projection screen distance and ambient brightness value, just can calculate and adopt which kind of projector's brightness the most suitable in such cases, and the brightness of this projector corresponding a suitable contrast.
Detection module of the present invention can also be the Contrast Detection module, be depicted as second kind of situation as Figure of description 3, what detection module detected herein is the contrast of projected image, be that detection module is specially the Contrast Detection module, described Contrast Detection module comprises a microfilming unit, when projector produces a reference picture on projection screen, this this reference picture of microfilming unit photographs, and calculate the contrast of projector's this moment according to the brightness of monochrome pixels point on this reference picture, again this contrast information is sent to Central Control Module;
Use under the situation of above-mentioned Contrast Detection module, the Central Control Module among the present invention can calculate the actual brightness that should export of current ambient brightness and projector; Because projector has a fixing contrast, can calculate corresponding to ambient brightness value by fixedly contrast and the actual contrast that records, calculate projector's brightness of current needs again according to this ambient brightness and the actual contrast that records when the front projection screen position; For example the black picture element brightness of projector is 1, white pixel brightness is 3000 lumens, be that contrast is 3000: 1, the actual contrast that records is 31: 1 under the situation that does not change above-mentioned black, white pixel brightness, because the actual contrast that records is determined jointly by the original brightness of ambient brightness and pixel, the ratio that is original white pixel brightness and ambient brightness sum and original black picture element brightness and ambient brightness sum is current contrast, according to above-mentioned relation, can calculate current ambient brightness is 100 lumens; Ambient brightness that Central Control Module goes out according to aforementioned calculation and current actual measurement contrast calculate the projector's brightness value that export; As having provided the corresponding relation between ambient brightness, projector's brightness, the actual measurement contrast in the table 2, when ambient brightness be 100 lumens, when the actual measurement contrast is 31: 1, corresponding projector's brightness is 1200.
Table 2
By the projector of said structure as can be seen, detect contrast and testing environment brightness and projector distance and can calculate the appropriate brightness that projector should export, between the brightness three of the contrast of projected image, ambient brightness, projector fixing relation is arranged.
The present invention also provides the method for a kind of automatic adjusting projector brightness, and shown in Figure of description 4, step comprises:
Step 101, projector is detected the parameter of current reference projection images;
Step 102, projector calculates the brightness value of projector's correspondence according to above-mentioned detected projective parameter;
Step 103, projector carries out projection by above-mentioned brightness value.
For step 101, projector can be divided into two kinds of situations to the detection of the parameter of reference projection images, and a kind of is that another kind of situation is the detection to the reference projection images contrast to distance detection between ambient brightness and projection screen and the projector;
Under first kind of situation, projector adopts luminance sensor that ambient brightness is detected, and the central processing unit that measurement result is input to projector is calculated, and then draws ambient brightness value; Projector adopts inner microfilming unit that the reference picture of projector's projection is taken, the central processing unit of projector is compared this reference picture that photographs with the projected image that prestores, because the size of pre-stored image and corresponding known with distance projector, then after recording the size of reference picture, just can calculate the distance between reference picture and the projector, it is the distance between projection screen and the projector, for example, the pre-stored image size is 0.5 meter on the projection screen at 1 meter of known distance projector, the size that now records reference picture is 1 meter, and the distance that then can calculate between front projection screen and projector is 2 meters;
In another case, projector adopts inner microfilming unit that the reference picture of projector's projection is taken, and calculates the black picture element of reference picture and the ratio of white pixel brightness by central processing unit, is the contrast of reference picture.
For step 102, projector is after the distance that records between ambient brightness and projection screen and the projector, according to the corresponding relation between distance, the projector's brightness between ambient brightness, projection screen and the projector, calculate the brightness of projector, as shown in table 3, when ambient brightness is 100 lumens, a projection screen distance when being 7 meters, Central Control Module calculates projector's brightness according to the corresponding relation in the table 3 and should be 1800 lumens;
Table 3
Projector is after recording the reference projection images contrast, because projector has a fixing contrast, can calculate corresponding to ambient brightness value by fixedly contrast and the actual contrast that records, calculate projector's brightness of current needs again according to this ambient brightness and the actual contrast that records when the front projection screen position; For example the original black picture element brightness of projector is 1, original white pixel brightness is 3000, be that contrast is 3000: 1, the actual contrast that records is 31: 1 under the situation that does not change above-mentioned black, white pixel brightness, because the actual contrast that records is determined jointly by the original brightness of ambient brightness and pixel, the ratio that is original black picture element brightness and ambient brightness sum and original white pixel brightness and ambient brightness sum is current contrast, according to above-mentioned relation, can calculate current ambient brightness is 100 lumens; Ambient brightness that projector goes out according to aforementioned calculation and current actual measurement contrast calculate the projector's brightness value that export; As having provided the corresponding relation between ambient brightness, projector's brightness, the actual measurement contrast in the table 4, when ambient brightness be 100 lumens, when the actual measurement contrast is 31: 1, corresponding projector's brightness is 1200.As shown in table 4:
Table 4
For step 103, projector is after calculating the brightness value that needs, and by the electric current of control projecting camera light bulb, and then the control output power reaches the purpose of control projector brightness to respective value.
Also can after calculating the brightness value that needs, projector take to change the brightness of projector among the present invention by the method for brightness value change projector input electrical signal intensity; After outside source is linked into projector, at first to pass through analog to digital converter (for the Anolog rgb signal, need to insert the AD chip, for the Video signal, need to insert Video Decoder) or digit signal receiver (for the DVI signal), on these devices, all there is register can control chip to carry out the parameters of analog to digital conversion or digital received, the register that is used for controlling analog to digital conversion side-play amount and yield value is wherein just arranged, by setting to these registers, the result who can the setting signal source inserts back digital-to-analog conversion or digital received does certain skew (all add or subtract certain numerical value) or does certain amplification (all taking advantage of a coefficient) on the basis of standard value (undressed default value), result after this processing of process has just changed the parameters such as intensity of actual signal, and the brightness of projector's projected image is also changed thereupon.
Claims (19)
1. a projector that regulates brightness automatically comprises Central Control Module, projecting camera light bulb, driver module, optical system, it is characterized in that, also comprises detection module and bulb power control module;
Described detection module is used for the parameter of projected image is detected;
Described Central Control Module goes out projector's brightness value according to the detected projected image calculation of parameter of detection module;
The brightness value that described bulb power control module is calculated according to Central Control Module, the output power of regulating projecting camera light bulb.
2. the projector of automatic adjusting brightness as claimed in claim 1 is characterized in that, described detection module comprises ambient brightness detection module and projector distance detection module.
3. the projector of automatic adjusting brightness as claimed in claim 2 is characterized in that, described ambient brightness detection module inputs to Central Control Module after gathering the ambient brightness signal by luminance sensor.
4. the projector of automatic adjusting brightness as claimed in claim 2, it is characterized in that, described projector distance detection module is by microfilming unit photographs reference projection images, this reference picture and pre-stored image are compared, calculate reference picture place projection screen distance, and this range information is sent to Central Control Module.
5. the projector of automatic adjusting brightness as claimed in claim 2 is characterized in that, described Central Control Module calculates projector's brightness value according to ambient brightness and projector distance.
6. the projector of automatic adjusting brightness as claimed in claim 1 is characterized in that, described detection module is the Contrast Detection module.
7. the projector of automatic adjusting brightness as claimed in claim 6, it is characterized in that, described Contrast Detection module calculates the contrast of reference picture by microfilming unit photographs reference projection images, and this contrast information is sent to Central Control Module.
8. the projector of automatic adjusting brightness as claimed in claim 6 is characterized in that, described Central Control Module calculates projector's brightness value according to the contrast information of projected image.
9. the projector of automatic adjusting brightness as claimed in claim 1 is characterized in that, described bulb power control module realizes adjusting to bulb power by the electric current of regulating the projecting camera light bulb apparatus for lighting up.
10. method that projector regulates brightness automatically is characterized in that step comprises:
Step 1, the parameter of current reference projection images detects in projector;
Step 2, projector goes out the brightness value of projector's correspondence according to above-mentioned detected calculation of parameter;
Step 3, projector carries out projection by above-mentioned brightness value.
11. projector as claimed in claim 10 regulates the method for brightness automatically, it is characterized in that, in the described step 1, and testing environment brightness of described projector and projection screen distance.
12. projector as claimed in claim 11 regulates the method for brightness automatically, it is characterized in that, described projector adopts luminance sensor that ambient brightness is detected, and testing result is imported the central processing unit of projector.
13. projector as claimed in claim 11 regulates the method for brightness automatically, it is characterized in that, described projector adopts microfilming unit photographs reference picture, by central processing unit this reference picture and pre-stored image is compared, and calculates the projection screen distance at reference picture place.
14. projector as claimed in claim 11 regulates the method for brightness automatically, it is characterized in that, in the described step 2, projector utilizes the corresponding relation of ambient brightness, projection screen distance, projector's brightness, calculates the brightness of projector.
15. projector as claimed in claim 10 regulates the method for brightness automatically, it is characterized in that, in the described step 1, the projected image contrast detects in described projector.
16. projector as claimed in claim 15 regulates the method for brightness automatically, it is characterized in that, described projector adopts microfilming unit photographs reference picture, by the ratio of black picture element and white pixel brightness in the central processing unit calculating reference picture, obtains the contrast of reference picture.
17. projector as claimed in claim 15 regulates the method for brightness automatically, it is characterized in that, in the described step 2, projector utilizes the corresponding relation of projected image contrast and projector's brightness, calculates the brightness of projector.
18. projector as claimed in claim 10 regulates the method for brightness automatically, it is characterized in that, in the described step 3, projector controls the output power of projecting camera light bulb by the brightness value that calculates.
19. projector as claimed in claim 10 regulates the method for brightness automatically, it is characterized in that, in the described step 3, projector controls the intensity of projector's input electrical signal by the brightness value that calculates.
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