CN100578602C - Automatic brightness control device of outdoor full color LED big screen display screen and method thereof - Google Patents
Automatic brightness control device of outdoor full color LED big screen display screen and method thereof Download PDFInfo
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Abstract
The invention relates to an automatic brightness control device and a method suitable for an outdoor full color LED large screen display panel, and comprises an optical system which is used for measuring environmental light, an environmental light sensor, a data acquisition card, as well as a brightness automatic controller which can change environmental light illuminance into the LED large screen display brightness via a lookup table. The invention measures the environmental light illuminance with the environmental light sensor, uses the brightness automatic controller to obtain the display brightness class needed by the current display panel via the lookup table, judges whether the current actual brightness of the display panel equals the needed brightness class, automatically controls the display brightness of the LED large screen, and enables the brightness of the full color LED large screen to change according to the changes of the environmental light. In this way, not only is the display quality raised, but also the consumption of electricity is greatly reduced, and at the same time, the service life of the LED tube of the full color LED large screen is prolonged.
Description
Technical field
The present invention relates to LED big screen display screen brilliance control technology.
Background technology
Outdoor full color LED big screen display screen has obtained using widely in multimedia, advertising.It can play sound, video frequency program, and the advertisement impulsive force is bigger; It can promote the city scientific and technological level, enriches city dweller's culture life.It all is visible under all surround lightings, a little has been unlikely to too bright and dazzles so will be when surround lighting is dark the gray scale of giant-screen be turned down; When surround lighting is brighter, the gray scale of giant-screen heightened a little in order to avoid the too dark Chu that do not see.Certainly, under lower ambient lighting, keep lower display brightness, can reduce the consumption of electric energy and the life-span of prolongation display screen LED luminescent device so greatly.
Brightness is meant the black and white gradation gray scale of image.Not only the power with brightness itself is relevant because people's vision system is to the impression of brightness power, also with fluorescent lifetime with to light area relevant, thereby utilize human eye " persistence of vision " effect, the conversion luminophor light the time and area is distinguished brightness, will form a kind of illusion of different gray scale pictures, to realize the full color LED big screen display screen gray level.General gray level is high more, and the level of shown image is overstepping the bounds of propriety bright, and image is soft more.The gray-scale Control means of using always on full color LED big screen display screen are width modulations at present, pulse duration modulation method is to utilize the integral characteristic of the vision of human eye to transient light intensity, allow the high-speed transitions of devices switch attitude show different gray scales, the dutycycle of single pixel switch attitude has determined the size of its gray-scale value in each.Scale-of-two timesharing width modulation is the most frequently used a kind of pulse duration modulation method that arrives in the demonstration field, its principle is that the every field time with video image is divided into some scale-of-two time interval or is called the binary digit time, the binary digit time that different gray levels is corresponding different.Owing to its control accuracy height, can realize the display effect of high grade grey level and more than one hundred million looks, this gray modulation mode is widely used in the digital high-definition displays such as LCD, PDP, OLED.
Brightness degree is that the globality of whole-screen brightness is described, and realizes by the dutycycle that changes signal pulse, and the corresponding maximum brightness degree of 100% dutycycle all has identical gray shade scale number under each brightness degree.We can change the brightness of display screen and not influence its gray scale like this, thereby, when changing brightness of display screen, keep the well arranged of the shown image of display screen, clear image, soft.
CCD (charge-coupled image sensor) sensor is a kind of novel photoelectric switching device, and it can store the signal charge that is produced by light.When it was applied the pulse of specific time sequence, the signal charge of its storage just can be made directional transmissions and realize self-scanning in CCD.It mainly is made up of photosensitive unit, input structure and export structure etc.It has functions such as opto-electronic conversion, information storage and time-delay, and integrated level height, power consumption are little, are widely used in this three big field of shooting, signal Processing and storage.Especially aspect image sensor application, obtain amazing development.CCD has the branch of face battle array and linear array, and the face battle array is the CCD pixel to be lined up the device on 1 plane; And linear array is CCD line of pixels device in line.
Summary of the invention
The invention provides a kind of device and method that passes through the measurement environment illuminance from the brightness of moving control outdoor full color LED big screen display screen, the display brightness of outdoor full color LED big screen display screen can be changed with ambient light.
The automatic brightness control device that the present invention proposes comprises optical system, ambient light sensor, data collecting card that is used for measure ambient light and the brightness self-actuated controller that ambient light is converted to the display brightness of LED giant-screen.
Described optical system and ambient light sensor carry out optical match, receive and transmit to ambient light sensor the surround lighting of full color LED big screen display screen.
The output of ambient light sensor connects data collecting card, light signal is changed into electric signal, and pass to data collecting card.
Data collecting card carries out the analog quantity that receives the digitizing conversion earlier, and the input port with the brightness self-actuated controller is connected again.
The brightness self-actuated controller links to each other with the display controller of LED giant-screen, it is searched by the prior look-up table that has been set in the controller according to the data that obtained by data collecting card earlier and obtains the required display brightness grade Bn of current display screen and give an order obtaining the brightness of current display screen, judge then whether the current intrinsic brilliance of display screen equals this required brightness degree, if then need not regulate; If not then the display controller to the LED giant-screen sends conditioning signal, make the LED giant-screen be adjusted to the regulation brightness degree.Simultaneously, the brightness self-actuated controller is connected with ambient light sensor by driving circuit, and it can send exposure time and the delay of control command control CCD.
The auto brightness control method that the present invention proposes at first is to adopt optical system to give ambient light sensor with the pass ambient of LED big screen display screen.
By ambient light sensor light signal is changed into electric signal, and pass to data collecting card.
Data collecting card carries out the digitizing conversion with the electric signal analog quantity that receives, and is transferred to the brightness self-actuated controller of the display brightness of control LED giant-screen.
The brightness self-actuated controller links to each other with the display controller of LED giant-screen, it is searched by look-up table according to the data that obtained by data collecting card earlier and obtains the required display brightness grade of current display screen and give an order obtaining the brightness of current display screen, judge then whether the current intrinsic brilliance of display screen equals this required brightness degree, if then need not regulate; If not, then be adjusted to corresponding needed brightness degree.Simultaneously, the brightness self-actuated controller is connected with ambient light sensor by driving circuit, and it can send exposure time and the delay of control command control CCD.
Above process the interval time of setting behind the T again repetitive cycling carry out.Wherein interval time, T should set smallerly, can avoid photosensitive window to be subjected to the interference of short time like this.Such as, when being subjected to of short duration strong illumination or blocking, automaton just can very fast brightness regulation giant-screen be returned.It is constant that the display brightness of this all-colour LED giant-screen keeps in certain ambient light scope.
These apparatus and method can be come the illumination of measure ambient light by ccd sensor, and control the display brightness of full color LED big screen display screen automatically according to the illumination of the surround lighting that records, keep gray shade scale constant simultaneously when making outdoor full color LED big screen display screen change display brightness, make content displayed keep clear, the quality that improve to show can be because of not occurred dazzle too bright or the too dark situation that does not see Chu.Like this, not only improve the quality that shows, also can reduce the consumption of electric energy and the LED tube lifetime of prolongation all-colour LED giant-screen greatly.
Description of drawings
The outdoor LED full-color giant-screen structural drawing of Fig. 1 for forming based on the automatic brightness control device of CCD ambient light sensor.
Fig. 2 is the theory diagram based on the automatic brightness control device of CCD ambient light sensor.
Fig. 3 is the schematic diagram based on the full-color giant-screen automatic brightness control device of the outdoor LED of CCD ambient light sensor.
Fig. 4 is the look-up table that is applicable to brightness self-actuated controller among the present invention.
Fig. 5 is different brightness degree figure under the same grayscale grade in the look-up table.
Fig. 6 is the software program flow chart of brightness self-actuated controller.
Embodiment
Below describe concrete enforcement of the present invention with reference to the accompanying drawings:
The typical structure that the present invention uses mainly comprises three parts: display screen, display controller, ambient light adaptive control device.As shown in Figure 1, the photosensitive window 3 of measurement environment electro-optical device is installed on the plane identical with display screen 1.The major part of display screen 1 is to show dot matrix and ranks driving circuit and some other circuit, and wherein each pixel 2 is made up of the red, green, blue three-color LED; Every display unit is made up of M*N pixel-matrix, and the full-color big screen display screen of complete outdoor LED is spliced by X piece display unit.In general, LED is installed in a side of pcb board, and row, column driving and other IC chips are installed in the opposite side of PCB version.
Fig. 2 is based on the theory diagram of the automatic brightness and controller of CCD ambient light sensor.Can adopt the multichannel detector of line array CCD 7 or area array CCD based on the ambient light sensor of CCD, main representative products has charge injection device (CID), charge-coupled device (CCD), MOS linear array image sensor (MOS Image Sensor) etc.Because structure, the principle of each sensor are not quite similar,, but,, preferably adopt line array CCD as ambient light sensor for reducing cost owing to CCD aspect sensitivity, random noise is more quite a lot of so they also all have characteristics separately.With the shine μ PD3575 of company of Tianjin is example, and its pixel number is 1024 pixels, and spectral response range is 400～1100nm, and peak sensitivity is 550nm.Comparatively speaking, the wavelength coverage of human eye energy sensing is very short, about 400～700nm, and peak sensitivity is about 560nm.So, do not provide easily and misread number if before line array CCD, do not add optical system, when especially having very a high proportion of infrared light in the light source.Therefore, in order to make ambient light sensor sensitivity and human eye vision sensitivity roughly the same, before the CCD ambient light sensor, added a diffraction grating 6.Diffraction grating selects for use Tianjin to open up the common reflective plane diffraction grating of the 45*45mm of general company, and its spectral range is 400～720nm, and blaze wavelength is 550nm, satisfies the visual sensitivity of human eye.
The optical system of measure ambient light comprises photosensitive window 3, optical fiber 4, collimating mirror 5 and diffraction grating 6.Adopt optical fiber 4 to transmit, the uncertainty that can avoid the optical centre disturbance to cause optical parameter to measure.Surround lighting becomes directional light through photosensitive window 3, Transmission Fibers 4, collimating mirror 5, again after diffraction grating 6 beam split, spectrum becomes flat Jiao Chang to be imaged on the line array CCD 7, after CCD is translated into electric signal, form with vision signal after the Integral Processing of overdrive circuit outputs to A/D capture card 8, inserts in the brightness self-actuated controller 9 through serial ports and handles.Simultaneously, controller is given an order the delay and the time shutter of control line array CCD.Wherein photosensitive window is a cosine rectifier, is installed on the plane identical with display screen.The cosine corrector is a kind of optical element that is used for the spectral radiance sampling, is used to collect the radiation (light) in 180 ° of solid angles.
Brightness self-actuated controller 8 can be a single-chip microcomputer, and its output one side links to each other with the display controller 11 or the display control circuit of the routine of LED giant-screen, is connected with ambient light sensor line array CCD 7 by driving circuit 10 on the other hand.Look-up table is housed in the single-chip microcomputer in advance and has write control program.It is searched by look-up table according to the data that obtained by data collecting card earlier and obtains the required display brightness grade Bn of current display screen and give an order obtaining the brightness of current display screen, judge then whether the current intrinsic brilliance of display screen equals this required brightness degree, if then need not regulate; If not then the display controller to the LED giant-screen sends conditioning signal, make the LED giant-screen be adjusted to corresponding needed brightness degree.Simultaneously, send control command to ccd sensor, time shutter and the delay of control CCD by driving circuit.
Fig. 3 is based on the surround lighting automaton of line array CCD and realizes the schematic diagram of the full-color large-size screen monitors brightness of control LED automatically.Photosensitive window 3 by measure ambient light obtains surround lighting, be connected on the ambient light adaptive control device 12, after display screen 1 starts, the line array CCD of ambient light adaptive control device 12 is passed to the brightness self-actuated controller with the environmental light brightness level An that records, and with the look-up table of data by having set in advance that obtains, tabling look-up obtains the required display brightness grade Bn of current display screen.
Fig. 4 is the look-up table that is applicable to brightness self-actuated controller of the present invention.The environmental light brightness variation range was by 10 in 24 hours
-4Cd/m
2To 10
4Cd/m
2
Surround lighting is divided into 100 grades, finds the full-color giant-screen intensity level of LED an of the best corresponding with it by experiment under each grade surround lighting, the full-color giant-screen intensity level of LED is represented with signal dutyfactor.100% dutycycle is represented the maximum brightness level, can also be divided into 100 grades to the brightness of the full-color giant-screen of LED like this.With surround lighting when the darkest pairing dutycycle 20% as the minimum brightness degree of the full-color giant-screen of LED; The brightness degree that makes the full-color giant-screen of LED increases progressively the dutycycle of correspondence 100% when surround lighting is the brightest with the enhancing of surround lighting.
Fig. 5 is brightness degree figure different under the same grayscale grade.We are example with signal 10100000, when brightness degree is 100%, come 1 high level just to light LED, come 0 low level just to extinguish, and as going up most shown in the figure, the gray shade scale of this moment is 160; In the time will being adjusted to 80% to its brightness degree if the width adjusting of each pulse to original 80%, and gray shade scale is still 160, shown in the figure of centre; In like manner, brightness degree is adjusted to 50% figure shown in a nethermost figure, it is 160 constant that gray shade scale keeps equally.
Fig. 6 is the software program flow chart of brightness self-actuated controller.When display screen is worked, just can measure the brightness degree of surround lighting, obtain the required brightness degree of current display screen by look-up table again and give an order, thereby control the brightness of current display screen.Then, judge whether the current intrinsic brilliance of display screen equals this required brightness degree.If then need not regulate; If not, then be adjusted to the regulation brightness degree.Behind timer is set interval time T, the illumination of measure ambient light again, the above process of repetitive cycling.T interval time of timer should set smallerly, can avoid photosensitive window to be subjected to the interference of short time like this.Such as, when being subjected to of short duration strong illumination or blocking, automaton just can very fast brightness regulation giant-screen be returned.Simultaneously, the brightness self-actuated controller is connected with ambient light sensor by driving circuit, and it can send time shutter and the delay that control command is controlled CCD.
Claims (8)
1, the automatic brightness control device of outdoor full color LED big screen display screen is characterized in that: it comprises optical system, ambient light sensor, data collecting card that is used for measure ambient light and the brightness self-actuated controller that can ambient light be converted to LED large screen display brightness by look-up table;
Described optical system and ambient light sensor carry out optical match, receive and transmit the residing ambient light of LED big screen display screen to ambient light sensor;
The output of ambient light sensor connects data collecting card, and light signal is changed into electric signal, and gives data collecting card with data transfer;
Data collecting card carries out the digitizing conversion with the analog quantity that receives and is connected with the input port of brightness self-actuated controller;
The brightness self-actuated controller links to each other with the display controller of LED giant-screen, it is searched by the prior look-up table that has been set in the controller according to the data that obtained by data collecting card earlier and obtains the required display brightness grade of current display screen and give an order obtaining the brightness of current display screen, then, judge whether the current intrinsic brilliance of display screen equals this required brightness degree, if then need not regulate; If not then the display controller to the LED giant-screen sends conditioning signal, make the LED giant-screen be adjusted to the regulation brightness degree; Simultaneously, the brightness self-actuated controller is connected with ambient light sensor by driving circuit, sends control command the control environment time shutter and the delay of optical sensor;
The look-up table of described brightness self-actuated controller is that surround lighting is divided into 100 grades, finds the full-color giant-screen intensity level of LED an of the best corresponding with it by experiment under each grade surround lighting, and the full-color giant-screen intensity level of LED is represented with signal dutyfactor; 100% dutycycle is represented the maximum brightness level, like this brightness of the full-color giant-screen of LED also has been divided into 100 grades; With surround lighting when the darkest pairing dutycycle 20% as the minimum brightness degree of the full-color giant-screen of LED; The brightness degree that makes the full-color giant-screen of LED increases progressively the dutycycle of correspondence 100% when surround lighting is the brightest with the enhancing of surround lighting.
2, the automatic brightness control device of outdoor full color LED big screen display screen according to claim 1 is characterized in that: described ambient light sensor adopts the multichannel detector of line array CCD or area array CCD.
3, the automatic brightness control device of outdoor full color LED big screen display screen according to claim 1, it is characterized in that: the optical system of described measure ambient light comprises photosensitive window, optical fiber, collimating mirror and grating, photosensitive window connects collimating mirror by optical fiber, collimating mirror becomes directional light to surround lighting, pass to grating, pass to ambient light sensor again after its beam split of grating pair.
4, the automatic brightness control device of outdoor full color LED big screen display screen according to claim 3 is characterized in that: photosensitive window is a cosine rectifier, is installed on the plane identical with display screen.
5, the automatic brightness control device of outdoor full color LED big screen display screen according to claim 3 is characterized in that: but the spectral range of the scope of the photometry of described grating spectrum and human eye vision is roughly the same.
6, the automatic brightness control device of outdoor full color LED big screen display screen according to claim 1 is characterized in that: described look-up table is divided into 100 grades with ambient light, and is corresponding one by one with the grade that the display brightness of LED giant-screen is divided into.
7, the automatic brightness control device of outdoor full color LED big screen display screen according to claim 1 is characterized in that: described brightness self-actuated controller is a single-chip microcomputer.
8, utilize the auto brightness control method of the outdoor full color LED big screen display screen of the described device realization of claim 1, it is characterized in that: it at first adopts the surround lighting of collection optical system LED big screen display screen, gives ambient light sensor with pass ambient; By ambient light sensor light signal is changed into electric signal, and give data collecting card data transfer; Data collecting card carries out the electric signal analog quantity that receives the digitizing conversion again, is transferred to the brightness self-actuated controller of the brightness of display screen of control LED giant-screen;
The brightness self-actuated controller links to each other with the display controller of LED giant-screen, it is searched by look-up table according to the data that obtained by data collecting card earlier and obtains the required display brightness grade of current display screen and give an order obtaining the brightness of current display screen, judge then whether the current intrinsic brilliance of display screen equals this required brightness degree, if then need not regulate; If not then the display controller to the LED giant-screen sends conditioning signal, the LED giant-screen is adjusted to corresponding needed brightness degree; Simultaneously, the brightness self-actuated controller is connected with ambient light sensor by driving circuit, sends control command the control environment time shutter and the delay of optical sensor;
Above process the interval time of setting behind the T again repetitive cycling carry out;
The look-up table of described brightness self-actuated controller is that surround lighting is divided into 100 grades, finds the full-color giant-screen intensity level of LED an of the best corresponding with it by experiment under each grade surround lighting, and the full-color giant-screen intensity level of LED is represented with signal dutyfactor; 100% dutycycle is represented the maximum brightness level, like this brightness of the full-color giant-screen of LED also has been divided into 100 grades; With surround lighting when the darkest pairing dutycycle 20% as the minimum brightness degree of the full-color giant-screen of LED; The brightness degree that makes the full-color giant-screen of LED increases progressively the dutycycle of correspondence 100% when surround lighting is the brightest with the enhancing of surround lighting.
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Assignee: fujian qiangli photoelectricity co., ltd. Assignor: Chongqing University Contract record no.: 2010350000182 Denomination of invention: Automatic brightness control device of outdoor full color LED big screen display screen and method thereof Granted publication date: 20100106 License type: Exclusive License Open date: 20080130 Record date: 20100727 |
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