CN102034407B - Light-emitting diode screen color and brightness adjustment method and system - Google Patents
Light-emitting diode screen color and brightness adjustment method and system Download PDFInfo
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Abstract
The invention discloses a light-emitting diode (LED) screen color and brightness adjustment method. White display is added in monochrome display to adjust the color and brightness of each pixel at the same time; as only if the difference between the brightness value and color coordinate of each pixel and the minimum brightness value, and the difference between the brightness value and color coordinate of each pixel and the furthest color coordinate value are known, the time length of the added white display can be calculated; as the demand on the shooting precision is not high, the entire LED screen picture can be taken, the demand on the environment is not high during shooting and the method is suitable for field adjustment; and as a tolerance range is set, the adjusted brightness and color coordinate are not required to be completely equal to the minimum brightness value and the furthest color coordinate value and the adjustment efficiency is increased. The invention also discloses a system corresponding to the method, and the method and system provided by the invention can be combined to adjust the color and brightness of the LED screen.
Description
Technical field
The present invention relates to the LED display technical field, particularly a kind of LED display colour brightness method of adjustment and system.
Background technology
Along with the LED(light emitting diode) fast development of technology, the video display screen that uses LED to make also is applied in various public arenas more and more widely.Compare with prior liquid crystal display, projection display screen, LED display has higher brightness and wideer colour gamut, can more easily satisfy outdoor demonstration to the high request of brightness and color.Yet, be different from the centralized lighting mode that LCDs and projection display screen adopt, LED display depend on each independently self luminous LED element finish the demonstration of picture, to a great extent, the consistency of performance of LED element has determined the quality of display effect.
When LED display was produced, usually according to display parameter (brightness, the colourity) requirement of order, preliminary brightness and the chrominance levels of determining to need to use the LED element carried out module production then, puts in order the screen assembly unit again.The discreteness of led chip material property and the slight change of packaging technology all can cause the brightness of LED element and color wavelength there are differences, the LED display especially employed LED element of large area LED display screen can not accomplished in full accordly aspect brightness and the colour index, cause the phenomenon that just exists brightness and irregular colour even when most display screens dispatch from the factory thus.Though part high-end devices manufacturer can select classification before the LED element comes into operation, on same display screen, use the LED element of same levels as far as possible, but the consequence of dividing selection operation to bring like this is operational LED rate range to narrow down, quantity reduces, cost price is high, is not suitable for being generalized to the ordinary student business men.
For effectively solving the influence that LED element function difference is brought, industry has proposed the method for LED display colour brightness straightened up in place, attempts to realize that not strict sorting LED element also can reach the effect of colour brightness consistance preferably.Domestic patent of invention 200810065151.X has proposed a kind of LED display and has shown corrective system and bearing calibration, as shown in Figure 1, gather colorimetric parameter and the luminance parameter that LED shows module by professional optical parameter collecting device, be transferred to computing machine by order wire and carry out analytical calculation, generation shows that with LED module is the single point correction data of unit, by control circuits such as electric currents the LED element is adjusted again, realized brightness and chromaticity correction by pulse signal width and the number (being so-called PWM modulation) of controlling the LED element conductive.This bearing calibration need be carried out under dark place or low light environment in order to realize calibration result preferably, to the environmental requirement height, requires also high to light collection equipment; Need simultaneously each module is carried out independent adjustment, be adapted at operation in the factory, can not carry out at the user scene, also be difficult to quick disposable adjustment and finish when display area is big, correction efficient is low.The more important thing is, passing along with service time, each module LED elements attenuate characteristic difference on the display screen, display screen display effect with dispatch from the factory before compare and descend obviously, the aggravation of phenomenons such as color and brightness irregularities is if proofread and correct according to said method this moment, all modules of display screen can only be pulled down successively, going back to factory readjusts and obtains the single point correction data, time-consuming, effort, performance difficulty.
Summary of the invention
The objective of the invention is to propose a kind of on-the-spot adjustment in real time that is applicable to, be not subjected to LED display colour brightness method of adjustment and the system of working environment restriction.
LED display colour brightness method of adjustment of the present invention comprises:
Carrying sprite, described monochrome to LED display is a kind of in the Red Green Blue;
Take the LED display sprite, the shooting precision of described shooting is for differentiating each pixel on the LED display;
From the sprite of taking, obtain monochromatic brightness value and the chromaticity coordinates that shows of each pixel;
Described brightness value and chromaticity coordinates are carried out discrete analysis, choose minimum brightness value and the most remote chromaticity coordinates value as initial reference point;
Serve as with reference to the monochromatic compensation rate of calculating each pixel with described initial reference point;
Adopt above step to calculate the monochromatic compensation rate of other two kinds of colors in each pixel Red Green Blue respectively;
When actual video shows, the picture of delivering to LED display is adjusted, described method of adjustment is: the white that increases corresponding duration according to described monochromatic compensation rate in the monochromatic display time interval of the every frame picture of corresponding pixel points shows that the specific practice that increases the demonstration of corresponding duration white is: light three LED elements of RGB in corresponding duration simultaneously.
Preferably, it is characterized in that,
Described step with described initial reference point serve as with reference to the monochromatic compensation rate of calculating each pixel after, when described step actual video shows, also comprise before the picture of delivering to LED display adjusted:
Carry sprite to LED display again;
The sprite that is delivered to the LED screen is again adjusted, and the method for adjustment the when method of adjustment of described adjustment shows with actual video is identical;
Take the sprite of the LED display after adjusting, obtain monochromatic brightness value and the chromaticity coordinates that shows of each pixel in the sprite of this time taking again;
Whether the difference of the brightness value that obtains again of check and chromaticity coordinates and described initial reference point is in range of tolerable variance, if in scope, do not serve as with reference to recomputating described monochromatic compensation rate, repeating described step of carrying sprite and back thereof again to LED display with described initial reference point then.
Preferably, the bound of described range of tolerable variance is respectively positive and negative 3% of described initial reference point.
LED display colour brightness method of adjustment of the present invention, adjust color and the brightness of each pixel simultaneously by the method that in monochrome shows, increases the white demonstration, since only need understand the brightness value of each pixel and the difference between chromaticity coordinates and minimum brightness value and the most remote chromaticity coordinates value can calculate increase the duration of white demonstration, therefore not high to taking accuracy requirement, and then can take the whole screen of LED picture, environmental requirement during to shooting is not high yet, adapted to on-the-spot adjustment, again owing to set range of tolerable variance, brightness and chromaticity coordinates after the adjustment needn't be equated fully with minimum brightness value and the most remote chromaticity coordinates, thereby improved adjustment efficient.
LED display colour brightness Adjustment System of the present invention comprises:
The sprite supply unit is used for carrying sprite to LED display, and described monochrome is a kind of in the Red Green Blue;
Capture apparatus is used for taking the sprite of LED display, and the shooting precision of described shooting is for differentiating each pixel on the LED display;
Brightness value and chromaticity coordinates acquiring unit are used for obtaining monochromatic brightness value and the chromaticity coordinates that shows of each pixel from the sprite of taking;
Initial reference point is chosen the unit, is used for described brightness value and chromaticity coordinates are carried out discrete analysis, chooses minimum brightness value and the most remote chromaticity coordinates value as initial reference point;
Monochromatic compensation rate computing unit, being used for described initial reference point serves as with reference to the monochromatic compensation rate of calculating each pixel;
Picture is adjusted circuit, be used for when actual video shows, the picture of delivering to LED display is adjusted, described method of adjustment is: the white that increases corresponding duration according to described monochromatic compensation rate in the monochromatic display time interval of the every frame picture of corresponding pixel points shows that the white demonstration that increases corresponding duration is specially: three LED elements of RGB are lighted simultaneously.
Preferably,
Described sprite supply unit also is used for carrying sprite to LED display again after described monochromatic compensation rate computing unit calculates described monochromatic compensation rate;
Described picture is adjusted circuit and also is used for adjusting the sprite of carrying again, and the method for adjustment when method of adjustment herein shows with actual video is identical;
Described capture apparatus also is used for taking the sprite of the LED display after adjusting;
Described brightness value and chromaticity coordinates acquisition module also obtain brightness value and the chromaticity coordinates of each pixel again for the sprite after the adjustment of taking;
Also comprise verification unit, be used for the difference of brightness value that check obtains again and chromaticity coordinates and described initial reference point whether in range of tolerable variance;
Described monochromatic compensation rate computing unit also be used for when the assay of described verification unit serve as that described monochromatic compensation rate is recomputated in reference with described initial reference point for not in range of tolerable variance the time.
Preferably, the bound of described range of tolerable variance is respectively positive and negative 3% of described initial reference point.
LED display colour brightness Adjustment System of the present invention, adopt picture to adjust circuit and adjust color and the brightness of each pixel simultaneously by in monochrome shows, increasing the white method that shows, since only need understand the brightness value of each pixel and the difference between chromaticity coordinates and minimum brightness value and the most remote chromaticity coordinates value can calculate increase the duration of white demonstration, therefore not high to taking accuracy requirement, and then can take the whole screen of LED picture, environmental requirement during to shooting is not high yet, adapted to on-the-spot adjustment, again owing to adopt verification unit to set range of tolerable variance, brightness and chromaticity coordinates after the adjustment needn't be equated fully with minimum brightness value and the most remote chromaticity coordinates, thereby improved adjustment efficient.
Description of drawings
Fig. 1 is the synoptic diagram of prior art LED module colour brightness Adjustment System;
Fig. 2 is the schematic flow sheet of LED display colour brightness method of adjustment embodiment one of the present invention;
Fig. 3 is the schematic flow sheet of LED display colour brightness method of adjustment embodiment two of the present invention;
Fig. 4 is the schematic flow sheet of LED display colour brightness Adjustment System embodiment one of the present invention;
Fig. 5 is the schematic flow sheet of LED display colour brightness Adjustment System embodiment two of the present invention.
Embodiment
LED display colour brightness method of adjustment of the present invention, elder generation's analog video shows to LED display carries sprite to calculate the monochromatic compensation rate of three kinds of colors of RGB, then in practical video shows, according to monochromatic compensation rate every frame picture is adjusted, the mode of adjusting is come display white for divide corresponding duration in the monochromatic display time interval of each pixel, this method not only can be adjusted the monochromatic chromaticity that shows, can also adjust display brightness synchronously, like this, can do strict sorting to the LED element, reduce production difficulty and production cost greatly.In addition, method of the present invention is owing to be to adjust picture according to the difference of brightness value and chromaticity coordinates between each pixel, therefore not high to taking accuracy requirement, anti-external interference is effective, needn't require environment when using is total darkness environment, even the environment of light is arranged, it is still better to adjust back full frame brightness and colourity consistance effect.Method of the present invention at full frame operation but not single casing or module can use at curstomer`s site, adjustment process is once finished, adjustment efficient height, method equipment needed thereby of the present invention is simple, and Installation and Debugging are convenient, be convenient to factory and curstomer`s site and use, especially be fit to after-sales service.Explain method of the present invention in detail below in conjunction with accompanying drawing and embodiment.
Embodiment one
LED display colour brightness method of adjustment of the present invention as shown in Figure 2, comprising:
When step 107, actual video demonstration, the picture of delivering to LED display is adjusted, described method of adjustment is: the white that increases corresponding duration according to described monochromatic compensation rate in the monochromatic display time interval of the every frame picture of corresponding pixel points shows.
Before step 102 is taken, set shooting distance and the resolving accuracy of capture apparatus earlier, make equipment can photograph the entire display screen picture and can differentiate each pixel.For the large tracts of land display screen, possibly can't satisfy this two requirements simultaneously, but can adopt the overlapping subregion of appropriateness to proofread and correct, can reach the effect that whole screen is proofreaied and correct equally.
Set up capture apparatus, carry complete red (or complete green or full indigo plant) picture to LED display, open capture apparatus and take this picture, brightness value and chromaticity coordinates when lighting through obtaining each pixel red LED element after the computational analysis, computing machine is done discrete analysis to brightness, the chromaticity coordinates of all red pixel points, the scope that statistic of classification brightness value and chromaticity coordinate are concentrated.Since brightness value from low to high, the chromaticity coordinates value by remote adjustment to the center be difficult to the realization, therefore step 104 has been chosen minimum brightness value and the initial reference point of the most remote chromaticity coordinates value conduct, brightness and the chromaticity coordinates of adjusting each pixel make it close with initial reference point, thereby can realize the whole screen consistance of LED display.Consistent for realizing whole screen, step 105 calculates the monochromatic compensation rate that each pixel must compensate according to the brightness value of each pixel and the difference between chromaticity coordinates value and the initial reference point earlier, in order in the monochromatic display time interval of frame picture, divide corresponding duration display white, for example, A pixel measured value and initial reference point deviation 10%, then corresponding when the red display of A pixel per second 1000 frames, mark off 10 frame durations and light simultaneously by red, green, blue, three LED elements, reach the purpose of brightness and chromaticity coordinates when changing A pixel red display simultaneously.
Determine that with same method each pixel is in monochromatic compensation rate and preservation green, when blueness shows.When the actual displayed video, according to the monochromatic compensation rate of each pixel the display frame of reality is adjusted, can so that the display frame color that presents to audience and brightness to reach whole screen consistent.
Embodiment two
When in monochromatic display time interval, dividing the white demonstration duration corresponding with monochromatic compensation rate, be the process of measuring because the process of dividing is actual, therefore the possibility of result after dividing is inaccurate, present embodiment has increased the step of check and has set range of tolerable variance at this situation, as shown in Figure 3, the complete step of present embodiment is as follows.
Sprite after step 208, shooting are adjusted also obtains brightness value and the chromaticity coordinates of each pixel again;
Whether the difference of step 209, the brightness value that obtains again of check and chromaticity coordinates and described initial reference point is in range of tolerable variance, if then returning step 205 outside scope recomputates monochromatic compensation rate, as if then enter step 210 in scope;
When step 211, actual video demonstration, the picture of delivering to LED display is adjusted, described method of adjustment is: the white that increases corresponding duration according to described monochromatic compensation rate in the monochromatic display time interval of the every frame picture of corresponding pixel points shows.
Step 201-205,210, the corresponding step 101-105 of 211 difference, 106,107, present embodiment has mainly increased step 206,207,208,209, step 207 pair is delivered to the sprite of LED screen again and adjusts, picture after the step 209 pair adjustment is tested, if the picture after then explanation is adjusted in range of tolerable variance has reached requirement, if the difference of the brightness value of pixel and chromaticity coordinates and initial reference point is still arranged outside range of tolerable variance, then recomputate monochromatic compensation rate, adjust again picture until the brightness value of all pixels and chromaticity coordinates value all in the range of tolerable variance of initial reference point.Usually, the bound of range of tolerable variance is got positive and negative 3% of initial reference point, namely for the brightness value of adjusting each pixel of back and chromaticity coordinates and the initial difference of reference point, its acceptable upper limit is 3% of initial reference point, lower limit be initial reference point negative 3%, also can relax range of tolerable variance according to demand or tighten up range of tolerable variance, tighter range of tolerable variance makes whole screen consistance higher, but makes obvious the increasing of collating time simultaneously and the efficient of the whole screen adjustment of influence.Redefine green the demonstration and the blue monochromatic compensation rate that shows after the same method.
The other technologies feature of present embodiment is identical with embodiment one, does not repeat them here.
LED display colour brightness Adjustment System of the present invention is the system corresponding with led color luminance regulating method of the present invention, explains native system in detail below in conjunction with accompanying drawing and embodiment.
Embodiment one
Led color brightness adjustment system of the present invention comprises:
The sprite supply unit is used for carrying sprite to LED display, and described monochrome is a kind of in the Red Green Blue;
Capture apparatus is used for taking the sprite of LED display, and the shooting precision of described shooting is for differentiating each pixel on the LED display;
Brightness value and chromaticity coordinates acquiring unit are used for obtaining monochromatic brightness value and the chromaticity coordinates that shows of each pixel from the sprite of taking;
Initial reference point is chosen the unit, is used for described brightness value and chromaticity coordinates are carried out discrete analysis, chooses minimum brightness value and the most remote chromaticity coordinates value as initial reference point;
Monochromatic compensation rate computing unit, being used for described initial reference point serves as with reference to the monochromatic compensation rate of calculating each pixel;
Picture is adjusted circuit, is used for when actual video shows the picture of delivering to LED display being adjusted, and described method of adjustment is: the white that increases corresponding duration according to described monochromatic compensation rate in the monochromatic display time interval of the every frame picture of corresponding pixel points shows.
By Fig. 3 and above description as can be known, each unit of sprite supply unit and other, equipment, circuit are independent mutually, capture apparatus, brightness value and chromaticity coordinates acquiring unit, initial reference point are chosen unit, monochromatic compensation rate computing unit and picture adjustment circuit and are linked to each other successively, and brightness value and chromaticity coordinates acquiring unit also link to each other with monochromatic compensation rate computing unit.
Embodiment two
The difference of present embodiment and embodiment one is that as shown in Figure 4, present embodiment has increased verification unit.In addition, described sprite supply unit also is used for carrying sprite to LED display again after described monochromatic compensation rate computing unit calculates described monochromatic compensation rate, described picture is adjusted circuit and also is used for adjusting the sprite of carrying again, method of adjustment when method of adjustment herein shows with actual video is identical, described capture apparatus also is used for taking the sprite of the LED display after adjusting, described brightness value and chromaticity coordinates acquisition module also obtain brightness value and the chromaticity coordinates of each pixel again for the sprite after the adjustment of taking, whether the brightness value that the check of described verification unit is obtained again and the difference of chromaticity coordinates and described initial reference point be in range of tolerable variance, described monochromatic compensation rate computing unit also be used for when the assay of described verification unit serve as that described monochromatic compensation rate is recomputated in reference with described initial reference point for not in range of tolerable variance the time, the bound of described range of tolerable variance is generally positive and negative 3% of described initial reference point.
As seen from the above description, in the present embodiment, the picture adjustment unit links to each other with the sprite supply unit, and newly-increased verification unit is chosen the unit and linked to each other with monochromatic compensation rate computing unit with brightness value and chromaticity coordinates acquiring unit, initial reference point respectively.
Led color luminance regulating method of the present invention is used in combination with the led color brightness adjustment system, can finishes the adjustment to colour brightness.
Above-described embodiment of the present invention does not constitute the restriction to protection domain of the present invention.Any modification of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection domain of the present invention.
Claims (6)
1. a LED display colour brightness method of adjustment is characterized in that, comprising:
Carrying sprite, described monochrome to LED display is a kind of in the Red Green Blue;
Take the LED display sprite, the shooting precision of described shooting is for differentiating each pixel on the LED display;
From the sprite of taking, obtain monochromatic brightness value and the chromaticity coordinates that shows of each pixel;
Described brightness value and chromaticity coordinates are carried out discrete analysis, choose minimum brightness value and the most remote chromaticity coordinates value as initial reference point;
Serve as with reference to the monochromatic compensation rate of calculating each pixel with described initial reference point;
Adopt above step to calculate the monochromatic compensation rate of other two kinds of colors in each pixel Red Green Blue respectively;
When actual video shows, the picture of delivering to LED display is adjusted, described method of adjustment is: the white that increases corresponding duration according to described monochromatic compensation rate in the monochromatic display time interval of the every frame picture of corresponding pixel points shows that the specific practice that increases the demonstration of corresponding duration white is: light three LED elements of RGB in corresponding duration simultaneously.
2. LED display colour brightness method of adjustment according to claim 1 is characterized in that,
Described step with described initial reference point serve as with reference to the monochromatic compensation rate of calculating each pixel after, when described step actual video shows, also comprise before the picture of delivering to LED display adjusted:
Carry sprite to LED display again;
The sprite that is delivered to the LED screen is again adjusted, and the method for adjustment the when method of adjustment of described adjustment shows with actual video is identical;
Take the sprite of the LED display after adjusting, obtain monochromatic brightness value and the chromaticity coordinates that shows of each pixel in the sprite of this time taking again;
Whether the difference of the brightness value that obtains again of check and chromaticity coordinates and described initial reference point is in range of tolerable variance, if in scope, do not serve as with reference to recomputating described monochromatic compensation rate, repeating described step of carrying sprite and back thereof again to LED display with described initial reference point then.
3. LED display colour brightness method of adjustment according to claim 2 is characterized in that, the bound of described range of tolerable variance is respectively positive and negative 3% of described initial reference point.
4. a LED display colour brightness Adjustment System is characterized in that, comprising:
The sprite supply unit is used for carrying sprite to LED display, and described monochrome is a kind of in the Red Green Blue;
Capture apparatus is used for taking the sprite of LED display, and the shooting precision of described shooting is for differentiating each pixel on the LED display;
Brightness value and chromaticity coordinates acquiring unit are used for obtaining monochromatic brightness value and the chromaticity coordinates that shows of each pixel from the sprite of taking;
Initial reference point is chosen the unit, is used for described brightness value and chromaticity coordinates are carried out discrete analysis, chooses minimum brightness value and the most remote chromaticity coordinates value as initial reference point;
Monochromatic compensation rate computing unit, being used for described initial reference point serves as with reference to the monochromatic compensation rate of calculating each pixel;
Picture is adjusted circuit, be used for when actual video shows, the picture of delivering to LED display is adjusted, described method of adjustment is: the white that increases corresponding duration according to described monochromatic compensation rate in the monochromatic display time interval of the every frame picture of corresponding pixel points shows that the white demonstration that increases corresponding duration is specially: three LED elements of RGB are lighted simultaneously.
5. LED display colour brightness Adjustment System according to claim 4 is characterized in that,
Described sprite supply unit also is used for carrying sprite to LED display again after described monochromatic compensation rate computing unit calculates described monochromatic compensation rate;
Described picture is adjusted circuit and also is used for adjusting the sprite of carrying again, and the method for adjustment when method of adjustment herein shows with actual video is identical;
Described capture apparatus also is used for taking the sprite of the LED display after adjusting;
Described brightness value and chromaticity coordinates acquisition module also obtain brightness value and the chromaticity coordinates of each pixel again for the sprite after the adjustment of taking;
Also comprise verification unit, be used for the difference of brightness value that check obtains again and chromaticity coordinates and described initial reference point whether in range of tolerable variance;
Described monochromatic compensation rate computing unit also be used for when the assay of described verification unit serve as that described monochromatic compensation rate is recomputated in reference with described initial reference point for not in range of tolerable variance the time.
6. LED display colour brightness Adjustment System according to claim 5 is characterized in that, the bound of described range of tolerable variance is respectively positive and negative 3% of described initial reference point.
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