CN104900188B - LED display uniformity correcting method - Google Patents
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Abstract
The present invention relates to a kind of LED display uniformity correcting method, including step：(i) grey-scale range of target LED display is adjusted to desired value from initial value, to increase the refresh rate of the target LED display, wherein the desired value is less than the initial value；(ii) after step (i), the target LED display is controlled to show correction picture；(iii) the correction picture is gathered to obtain correction image；(iv) hardware for generating the correction coefficient of the target LED display with image according to the correction and the correction coefficient being sent to the target LED display is stored；And (v) recovers the grey-scale range of the target LED display to the initial value from the desired value after the correction coefficient is stored.Therefore, the present invention can shorten the time for exposure needed for correction, so as to shorten correction time, improve correction efficiency.
Description
Technical field
The present invention relates to LED to show alignment technique field, more particularly to a kind of LED display uniformity correcting method.
Background technology
Since 21 century, colour shows that industry is developed on an unprecedented scale, and the center that LED display has also spread all over each city is wide
Field, commercial mansion.LED display with its it is distinctive bright in luster, visual high, low in energy consumption the advantages that enjoy people's favorable comment, so
And because LED manufacturing technology level is more low so that the LED produced itself has larger bright chroma difference (example
Such as a production batch LED, its brightness may differ by nearly 50%, and colourity may differ by 15~20nm), and multiple different productions
The display screen of batch LED splicing, its bright chroma difference are just more serious.These bright chroma differences are for human eye vision
It is intolerable, so LED display that is new production or using year in year out needs to carry out effective bright chroma regulation.
It is at present to use base for one of LED display processing mode of bright chroma difference be present in LED display industry
In the correction of machine vision, namely utilize image capture device (such as camera), chromascope measuring apparatus combination pointwise correction system
System is corrected to display screen, eliminates the bright chroma difference between LED point, and the high uniformity for reaching display screen bright chroma is consistent
Property.
In trimming process, primary colours shown by correction librarian use image capture device collection LED display (such as red,
It is green, blue) image, only when the time for exposure of image capture device being much larger than LED refresh time, the image photographed is only
Normally, for example the time for exposure is 200 times of refresh time；And if the time for exposure of image capture device be not much larger than
LED refresh time, it may result in the image collected and have refresh line, after causing to be corrected using the collection image
Effect it is undesirable.The method that tradition removes refresh line is to extend to much larger than LED screen the time for exposure for making image capture device
The refresh time of body, so that the image collected does not have refresh line, to ensure not influence calibration result.
However, the time for exposure length of image capture device, can cause correction time to be grown, reduce correction efficiency, while
Ectocine (influence of noise) can be caused to become big.
The content of the invention
Therefore, to overcome deficiency of the prior art, the present invention proposes a kind of LED display uniformity correcting method.
Specifically, a kind of LED display uniformity correcting method provided in an embodiment of the present invention, including step：(i) by mesh
The grey-scale range of mark LED display is adjusted to desired value from initial value, to increase the refresh rate of the target LED display, its
Described in desired value be less than the initial value；(ii) after step (i), the target LED display is controlled to show correction picture
Face；(iii) the correction picture is gathered to obtain correction image；(iv) target is generated with image according to the correction
The correction coefficient is simultaneously sent to the hardware of the target LED display and stored by the correction coefficient of LED display；With
And (v) recovers the grey-scale range of the target LED display to described from the desired value after the correction coefficient is stored
Initial value.
In one embodiment of the invention, the control target LED display display correction in above-mentioned steps (ii)
Included with picture：The target LED display is controlled to show the picture of multiple different colours according to preset order, and it is the multiple
The picture of different colours is respectively sprite or pure color picture.
In one embodiment of the invention, used in above-mentioned steps (iii) using the image capture device collection correction
Picture, and the time for exposure of described image collecting device be set to the minimum exposure for meeting that acquired image occurs without refresh line
Between light time.
In one embodiment of the invention, the correction coefficient in above-mentioned steps (iv) is brightness correction coefficients or bright chroma
Correction coefficient.
In one embodiment of the invention, above-mentioned LED display uniformity correcting method using brightness point by point correct or
Point-by-point bright chroma correction.
In addition, on the other hand LED display uniformity correcting method that the embodiment of the present invention provides includes step：Reduce mesh
Mark the grey-scale range of LED display；Time for exposure of image capture device is adjusted to meeting that acquired image occurs without refreshing
Line；Using described image collecting device to carrying out IMAQ and root with the target LED display for reducing grey-scale range
The brightness correction coefficients or bright chroma correction coefficient of the target LED display are generated according to acquired image；And generating
After brightness correction coefficients or the bright chroma correction coefficient, increase the grey-scale range of the target LED display.
In one embodiment of the invention, the above-mentioned time for exposure is to meet that acquired image occurs without refresh line most
The small time for exposure.
In one embodiment of the invention, the grey-scale range of the above-mentioned increase target LED display is by the mesh
The grey-scale range of mark LED display recovers the value to reduction.
From above-described embodiment, the present invention reduces the grey-scale range of target LED display before IMAQ and in life
The grey-scale range of target LED display is increased again after into correction coefficient, such as recovered to initial value, so can then shorten school
The just required time for exposure, so as to shorten correction time, improve correction efficiency.In addition, the invention enables to calibration equipment
It is required that it is lower, the equipment that the time for exposure is shorter can be used.
By the detailed description below with reference to accompanying drawing, other side of the invention and feature become obvious.But it should know
Road, the accompanying drawing is only the purpose design explained, not as the restriction of the scope of the present invention, because it should refer to
Appended claims.It should also be noted that unless otherwise noted, it is not necessary to which scale accompanying drawing, they only try hard to concept
Ground illustrates structure and flow described herein.
Brief description of the drawings
Below in conjunction with accompanying drawing, the embodiment of the present invention is described in detail.
A kind of correction hardware structure used by LED display uniformity correcting methods of the Fig. 1 for the embodiment of the present invention
Schematic diagram.
Fig. 2 is the flow chart of the LED display uniformity correcting method of the embodiment of the present invention.
Embodiment
For ease of understanding the present invention, several basic conceptions are introduced first below：
(a) LED display principle of luminosity and pulse width modulation
LED (Light Emitting Diode, sending out light emitting diode) is a kind of solid state semiconductor devices, and it can be straight
Connect and electricity is converted into light；LED brightness depends on LED switch number in the unit interval.LED response time typically only has several receive
Second to hundreds of nanoseconds, it is suitable for frequently switching on and the occasion of high frequency running, simultaneously because the specific electric current/luminous intensities of LED
Characteristic, therefore can be realized by periodically pulsing width modulated, namely the mode of control output current dutycycle to LED
The regulation of brightness, such as brightness is halved, only electric current can need to be provided in 50% duty cycle realizes.To ensure
Human eye is not felt by pwm pulse, and the frequency of pwm signal necessarily be greater than 100Hz, and maximum PWM frequency depends on and power initiation
And the response time.It should be able to receive up to 50KHz's to provide maximum flexibility and integrated simplification, LED drive chip
PWM frequency.200~300Hz switching frequency can typically be selected to carry out PWM brightness regulations, because human eye is difficult to differentiate
The change of frequency more than 40Hz, and that white light color can be caused to be shifted over is non-linear with brightness regulation for too high frequency.
(b) GTG
Gray scale i.e. so-called GTG, refer to the bright-dark degree of brightness, in LED shows industry, refer in particular to every kind of primary colours
Luminosity.The luminosity of primary colours is divided by intensity size, is exactly gray level.Gray level caused by display screen energy is got over
Height, the color and image level of display are more.For digitized Display Technique, gray level is to show determining for number of colors
Determine factor.In general gray level is higher, and the color of display is abundanter, and picture is also finer and smoother, is more easy to the abundant details of performance.
In digitization system, the ability of gray level control is represented that so-called number of grey levels is exactly by number of grey levels
Refer to can be controlled gray level grade number；Such as the gray scale of 16 ranks can be controlled, its number of grey levels is just
It is 16.In digital circuit, 16 different numbers are represented with 4bit binary numbers.It can be seen that for gray level control
Bit quantity is more, can caused by gray level it is bigger, the image shown is finer and smoother.
Number of grey levels depends primarily on the digital-to-analogue conversion digit of system, video frequency processing chip, the memory of certain system
And Transmission system is offered to the support of corresponding digit.LED display mainly uses at present：
First, 8 processing systems, namely 256 (2 8 powers) level gray scales are simple to understand to be exactly from black to sharing 256 kinds in vain
Brightness changes.
2nd, 10 processing systems, namely 1024 (2 10 powers) level gray scales are simple to understand to be exactly from black to white shared
1024 kinds of brightness become
3rd, 12 processing systems, namely 4096 (2 12 powers) level gray scales are simple to understand to be exactly from black to white shared
4096 kinds of brightness changes
4th, 14 processing systems, namely 16384 (2 14 powers) level gray scales are simple to understand to be exactly from black to white shared
16384 kinds of brightness changes
(c) LED display refresh rate
Refresh rate refers to the number of image multiple scanning each second on the screen of LED display, namely refers to that image is shielding
The speed updated on curtain；Refresh rate is higher, and shown image (picture) stability is better.
(d) relation between LED display refresh rate and grey-scale range
Grey-scale range refers to the brightness resolution of each LEDs on LED display, for example, 4bit grey-scale range tables
The brightness that showing LED has 16 ranks changes.The GTG of LED luminance is by the OE width on driving chip and SDI (Serial Data
In, serial date transfer) control, so that LED will show GTG 5 as an example, SDI must be 1 (2 0 powers) and 4 (2 in OE width
2 powers) when open output switch, show GTG as 5 to obtain overall LED.And GTG 9,4 and 11 is then by that analogy, with
The permutation and combination of different SDI and OE width can realize different LED GTGs, will also show different LED luminances.Remove
Outside this, OE cycle is shorter, and the time completed needed for a GTG is also shorter, that is, in the unit interval, can obtain
Refresh rate it is also higher.Generally, OE cycle size is related to grey-scale range, and grey-scale range is bigger (namely for gray level
The bit quantity of control is more), then OE cycle is longer, and correspondingly refresh rate is also lower；Conversely, grey-scale range is smaller, then OE
Cycle it is shorter, correspondingly refresh rate is also higher.
The following embodiments of the present invention be using the grey-scale range (grey exponent number) of LED display between refresh rate into reverse
The characteristic of relation, namely grey-scale range are bigger, and the displayable grey exponent number of LED display is more, then refresh rate is lower, such as LED
Display screen is 14 processing systems, namely 16384 (2 14 powers) level gray scales, and its refresh rate maximum can reach 5KHZ, if but making
Grey exponent number that LED display is shown reduces (limit be only one-level gray scale, i.e. screen Chang Liang), then its refresh rate will significantly
Improve, such as 50KHZ；Therefore, in LED display homogeneity correction, it is possible to adjust the grey-scale range of LED display, make it
The grey exponent number of display is reduced, and can thus substantially increase the refresh rate of LED display, and then can reduce IMAQ
Time for exposure, accelerate trimming process.Certainly, this processing method simply adjusts in trimming process, after correction coefficient is obtained
The grey-scale range of LED display and refresh rate are recovered to original state again.To make the above objects, features and advantages of the present invention
Can be more obvious understandable, the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.
Fig. 1 is referred to, it is a kind of school used by LED display uniformity correcting method provided in an embodiment of the present invention
Just using the schematic diagram of hardware structure.In Fig. 1, correction system 10 includes image capture device 11 and correcting computer 13, and LED shows
Display screen system 20 includes LED display 21 and control system 23.Wherein, image capture device 11 is, for example, mm professional camera special, is used for
The picture shown to LED display 21 is shot to gather image；Correcting computer 11 connects image capture device 13 and pacified
Equipped with correction software, the correction software is used to analyze the image that image capture device 13 collects and generate after being analyzed and processed
Correction coefficient, the correction coefficient of generation will be sent to LED display 21 by the control system 23 in LED display screen system 20
Store and use.LED display 21 generally includes multiple LED boxes being stitched together, and each LED box generally includes one
Or multiple LED lamp panels and the reception card (or LED display control panel) for electrically connecting LED lamp panel.In addition, LED display system
System 20 can be synchronous LED display screen system or asynchronous LED display screen system, for synchronous LED display screen system, control system
23 include sending card (or Video Controller) and host computer, and host computer is connected to the reception of LED display 21 by sending card
Card, in the case of host computer also serves as video source, the content one for image content and the host computer broadcasting that LED display 21 is shown
Cause, host computer LED display 21 if shutdown will be unable to play media.For asynchronous LED display screen system, control system 23
Including Asynchronism Card (being usually a kind of embedded Control card with arm processor, alternatively referred to as Video Controller), Asynchronism Card connects
The reception card of LED display 21 is connected to, Asynchronism Card incorporates the basic function and hair of the host computer in synchronous LED display screen system
The function of card feed, therefore asynchronous LED display screen system need not connect host computer when playing media.
Fig. 2 is referred to, it is the flow chart of the LED display uniformity correcting method of the embodiment of the present invention.Such as Fig. 2 institutes
Show, the LED display uniformity correcting method of the embodiment of the present invention comprises the following steps S210, S230 and S250.
Step S210：The grey-scale range of target LED display is adjusted to desired value.Specifically, due to target LED display
The refresh rate of grey-scale range and its display image there is characteristic into inverse relationship, therefore by the GTG of target LED display
Scope is adjusted to desired value from initial value, to reduce the grey-scale range of target LED display, and then increases target LED display
Refresh rate prepare for follow-up trimming process.Herein it is understood that because being the GTG for reducing target LED display
Scope, therefore the desired value is less than the initial value.In the present embodiment, target LED display is RGB three primary colours all-colour LEDs
Display screen, but the present invention is not limited thereto, and it can also be monochromatic or dual-colored LED display screen.
Step S230：Acquisition correction with picture obtain correction with image, carry out image procossing, generation and uploads correction coefficient
To target LED display.Specifically, control instruction can be sent by the correcting computer 13 in Fig. 1 to control to control system 23
LED display 21 shows correction picture, and, the correction picture can be with RGB three primary colours full-color LED display screen as an example
It is the red, green and blue picture shown according to preset order, namely is sprite；And same colored picture is continuous
It can also be multiple that the quantity of display, which can be one,；, can be with except showing sprite in addition, in certain embodiments
Further show pure color picture such as white picture.
Hold it is above-mentioned, can be right by the image capture device 11 (such as camera) in Fig. 1 after each width correction picture is shown
The destination display area of quasi- target LED display carries out picture photographing to obtain correction image.In the present embodiment, in shooting the
Before one width correction picture, time for exposure of image capture device 11 should be first adjusted to dbjective state, dbjective state herein
Preferably meet that acquired image occurs without the minimum exposure time of refresh line., can after required correction image is obtained
Image procossing is carried out with image to correction by the correction software that the correcting computer 11 in Fig. 1 is installed, such as carries out viewing area
Positioning, LED point location scheduling algorithm obtain the monochrome information or bright chroma information of each LED point on target LED display.
Afterwards, given birth to by the correction software on correcting computer 11 according to the monochrome information or bright chroma information of obtained each LED point
Into the correction coefficient of each LED point, e.g. brightness correction coefficients, or it is bright chroma correction coefficient.Next,
To after the correction coefficient of each LED point, the correction coefficient of each LED point can be sent to by the control system 23 in Fig. 1
Reception card in LED display 21 is stored, so as to realize the brightness point by point correction or point-by-point bright to target LED display
Chromaticity correction.It is understood that for the show uniformity of target LED display is corrected to satisfactory state, then would generally hold
Row is once and an above step S230.
Step S250：The grey-scale range of target LED display is recovered to initial value.As mentioned previously, because gray level is got over
High (corresponding grey-scale range is bigger), the color of display is abundanter, picture is also finer and smoother, is more easy to the abundant details of performance, therefore
, will after generation correction coefficient, even after the hardware that the correction coefficient of generation is uploaded to target LED display is stored
The grey-scale range of target LED display is recovered to initial value from foregoing desired value.It is of course also possible to do not recover to initial value, and
It is that the grey-scale range of target LED display is increased to by other values from foregoing desired value according to the demand of practical application.
In summary, the above embodiment of the present invention reduce before IMAQ target LED display grey-scale range and
The grey-scale range increase of target LED display is for example recovered to initial value again after generation correction coefficient, so can then be shortened
Time for exposure needed for correction, so as to shorten correction time, improve correction efficiency.In addition, the invention enables to calibration equipment
Requirement it is lower, time for exposure shorter equipment can be used.
So far, principle and reality of the specific case used herein to the LED display uniformity correcting method of the present invention
The mode of applying is set forth, and the explanation of above example is only intended to help the method and its core concept for understanding the present invention；Together
When, for those of ordinary skill in the art, according to the thought of the present invention, have in specific embodiments and applications
Change part, in summary, this specification content should not be construed as limiting the invention, and protection scope of the present invention should be with institute
Attached claim is defined.
Claims (8)
1. a kind of LED display uniformity correcting method, it is characterised in that including step：
(i) grey-scale range of target LED display is adjusted to desired value from initial value, to increase the target LED display
Refresh rate, wherein the desired value is N positions grey-scale range, the initial value is M positions grey-scale range, N<M and M, N are just whole
Number；
(ii) after step (i), the target LED display is controlled to show correction picture；
(iii) the correction picture is gathered to obtain correction image；
(iv) correction coefficient of the target LED display is generated with image according to the correction and passes the correction coefficient
The hardware for delivering to the target LED display is stored；And
(v) after the correction coefficient is stored, the grey-scale range of the target LED display is recovered to institute from the desired value
State initial value.
2. LED display uniformity correcting method as claimed in claim 1, it is characterised in that in step (ii), control institute
State target LED display and show that correction is included with picture：The target LED display is controlled to show multiple differences by preset order
The picture of color, and the picture of the multiple different colours is respectively sprite or pure color picture.
3. LED display uniformity correcting method as claimed in claim 1, it is characterised in that in step (iii), utilize
Image capture device gathers the correction picture, and the time for exposure of described image collecting device is set to satisfaction and gathered
Image occur without minimum exposure time of refresh line.
4. LED display uniformity correcting method as claimed in claim 1, it is characterised in that in step (iv), the school
Positive coefficient is brightness correction coefficients or bright chroma correction coefficient.
5. LED display uniformity correcting method as claimed in claim 1, it is characterised in that the LED display uniformity
Bearing calibration is corrected using brightness point by point or point-by-point bright chroma correction.
6. a kind of LED display uniformity correcting method, it is characterised in that including step：
Reduce the grey-scale range of target LED display, to cause the grey-scale range of the target LED display to be decreased to N from M positions
Position, wherein N<M and M, N are positive integer；
Time for exposure of image capture device is adjusted to meeting that acquired image occurs without refresh line；
Using described image collecting device to carrying out IMAQ, simultaneously with the target LED display for reducing grey-scale range
The brightness correction coefficients or bright chroma correction coefficient of the target LED display are generated according to acquired image；And
After the brightness correction coefficients or bright chroma correction coefficient are generated, increase the grey-scale range of the target LED display.
7. LED display uniformity correcting method as claimed in claim 6, it is characterised in that the time for exposure is satisfaction
Acquired image occurs without the minimum exposure time of refresh line.
8. LED display uniformity correcting method as claimed in claim 6, it is characterised in that increase the target LED and show
The grey-scale range of screen be by the grey-scale range of the target LED display from N bit recoveries to reduction before M positions.
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| CN105390092B (en) * | 2015-12-09 | 2018-01-12 | 西安诺瓦电子科技有限公司 | LED display image processing method and device and its application |
| CN107293253A (en) * | 2017-05-15 | 2017-10-24 | 西安诺瓦电子科技有限公司 | Display control card and its date storage method |
| CN109192088A (en) * | 2018-10-31 | 2019-01-11 | 北京明瑞之光科技有限公司 | A kind of vertical runner device display methods |
| CN111640391A (en) * | 2019-03-01 | 2020-09-08 | 杭州海康威视数字技术股份有限公司 | Display screen display adjusting method and system |
| CN110111732B (en) * | 2019-05-13 | 2020-11-06 | 云谷（固安）科技有限公司 | Brightness adjusting method of spliced screen, display sub-screen of spliced screen and spliced screen |
| CN113380181B (en) * | 2020-02-25 | 2023-12-05 | 西安诺瓦星云科技股份有限公司 | Display screen correction system |
| CN113470563A (en) * | 2020-03-13 | 2021-10-01 | 西安诺瓦星云科技股份有限公司 | Display screen correction system and method |
| CN111862887A (en) * | 2020-08-13 | 2020-10-30 | 深圳市奥拓电子股份有限公司 | Correction data control method and device for self-adaptive gray scale and LED display screen |
| CN112991233B (en) * | 2021-05-14 | 2021-07-27 | 深圳精智达技术股份有限公司 | Image correction method and device |
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| JP2004301976A (en) * | 2003-03-31 | 2004-10-28 | Nec Lcd Technologies Ltd | Video signal processor |
| CN2609301Y (en) * | 2003-04-22 | 2004-03-31 | 海信集团有限公司 | Eight bit/ten bit switching circuit of display image signal gamma correction |
| JP4367308B2 (en) * | 2004-10-08 | 2009-11-18 | セイコーエプソン株式会社 | Display driver, electro-optical device, electronic apparatus, and gamma correction method |
| CN100375987C (en) * | 2005-10-14 | 2008-03-19 | 四川世纪双虹显示器件有限公司 | Method for treating color plasma display screen grey |
| KR20070099170A (en) * | 2006-04-03 | 2007-10-09 | 엘지.필립스 엘시디 주식회사 | Apparatus and method for driving data, apparatus and method for driving of image display device using the same |
| US20090195483A1 (en) * | 2008-02-06 | 2009-08-06 | Leadis Technology, Inc. | Using standard current curves to correct non-uniformity in active matrix emissive displays |
| CN102903329A (en) * | 2012-10-12 | 2013-01-30 | 西安诺瓦电子科技有限公司 | Light emitting diode (LED) display screen brightness regulating method without loss of low gray scale |
| CN103927980A (en) * | 2014-03-10 | 2014-07-16 | 深圳市奥拓电子股份有限公司 | Point-by-point correcting method and device for LED display screen |
| CN104217683B (en) * | 2014-09-09 | 2016-09-07 | 西安诺瓦电子科技有限公司 | Gradation data subfield method of combination and device, LED display drive method |
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