CN103559864A - Bright chroma correcting method for LED display modules - Google Patents
Bright chroma correcting method for LED display modules Download PDFInfo
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Abstract
The invention discloses a bright chroma correcting method for LED display modules. The bright chroma correcting method comprises the steps of collecting bright chroma information of at least one sample extracted out of the plurality of LED display modules, analyzing the bright chroma information of the at least one sample to obtain a public bright chroma value of the at least one sample, setting a bright chroma correcting target value according to the public bright chroma value, collecting bright chroma information of one LED display module to be corrected in the LED display modules, and working out a pixel point correcting coefficient of the LED display module to be corrected according to the bright chroma information of the LED display module to be corrected and the bright chroma correcting target value. The bright chroma correcting method can obtain the public bright chroma value through sampling and collecting, can set the bright chroma correcting target value according to the public bright chroma value and uses the bright chroma correcting target value to generate the pixel point correcting coefficient of the LED display module to be corrected. Thus, the LED display modules of different batches have higher bright chroma consistency.
Description
Technical field
The present invention relates to show alignment technique field, be specifically related to a kind of light tone degree bearing calibration of LED display module.
Background technology
LED display is as novel display technique, with its energy-saving and environmental protection, the advantage such as highlighted, accepted gradually, thereby be widely used in the fields such as city medium, urban transportation electronic mark board by market.
At present, along with going from strength to strength of LED display market, more and more for the demand of different batches LED lamp plate or the correction of LED casing.Existing LED display bearing calibration is difficult to guarantee to adopt the rear light tone degree of LED display correction of multiple batches of LED lamp plate or LED casing consistent with homogeneity height, thereby when assembly LED display, make the selection of LED lamp plate or LED casing be subject to certain limitation.
Summary of the invention
Therefore, the technological deficiency existing for overcoming prior art, the present invention proposes a kind of light tone degree bearing calibration of LED display module.
Particularly, the light tone degree bearing calibration of a kind of LED display module that the embodiment of the present invention proposes, comprises step: the bright chrominance information that gathers at least one sample extracting from a plurality of LED display modules; The described light tone degree information analysis of described at least one sample, to obtain the public bright chromatic value of described at least one sample, and is set to a light tone degree correction target value according to described public bright chromatic value; One of gather in described a plurality of LED display module the bright chrominance information of LED display module to be corrected; And the pixel correction coefficient that calculates described LED display module to be corrected according to the described bright chrominance information of described LED display module to be corrected and described light tone degree correction target value is for proofreading and correct the light tone degree of described LED display module to be corrected.
In one embodiment of the invention, above-mentioned LED display module to be corrected is the LED casing with display control card, and the bearing calibration of above-mentioned light tone degree also comprises step: the described pixel correction coefficient of described LED display module to be corrected is sent and is stored in the storer on the described display control card of described LED display module to be corrected.
In one embodiment of the invention, above-mentioned LED display module to be corrected is the LED lamp plate that is provided with storer, and the bearing calibration of described light tone degree also comprises step: the described pixel correction coefficient of described LED display module to be corrected is sent and is stored in the described storer of described LED display module to be corrected.
In one embodiment of the invention, the bearing calibration of above-mentioned light tone degree also comprises step: send and store described pixel correction coefficient to described LED display module to be corrected.
In one embodiment of the invention, the bearing calibration of above-mentioned light tone degree also comprises step: the identifier of obtaining described LED display module to be corrected; And described pixel correction coefficient and the described identifier of described LED display module to be corrected are associated together and are stored to database.
In one embodiment of the invention, the above-mentioned step that obtains the identifier of described LED display module to be corrected comprises: utilize Software Create and obtain described identifier or scan the label of described LED display module to be corrected and obtain described identifier.
The step of the bright chrominance information of at least one sample that in one embodiment of the invention, above-mentioned collection is extracted from a plurality of LED display modules comprises: each sample of controlling in described at least one sample sequentially shows a plurality of different color pictures; And take described a plurality of different color picture to obtain the described bright chrominance information of described at least one sample.
In one embodiment of the invention, the described a plurality of different color pictures of above-mentioned shooting comprise to obtain the step of the described bright chrominance information of described at least one sample: take the regional area of color picture described in each to obtain the bright chrominance information of described regional area, and the described bright chrominance information using the described bright chrominance information of described regional area as corresponding sample.
In one embodiment of the invention, the above-mentioned step of setting a light tone degree correction target value according to described public bright chromatic value comprises: described public bright chromatic value is set as to described light tone degree correction target value.
In one embodiment of the invention, the above-mentioned step of setting a light tone degree correction target value according to described public bright chromatic value comprises: according to a light tone of described public bright chromatic value and setting, sacrifices number percent and obtains revised public bright chromatic value, and using described revised public bright chromatic value as described light tone degree correction target value.
The step of the bright chrominance information of at least one sample that in one embodiment of the invention, above-mentioned collection is extracted from a plurality of LED display modules comprises: be subordinated in described a plurality of LED display modules of different batches and extract a plurality of samples; And the bright chrominance information that gathers described a plurality of samples.
As from the foregoing, the embodiment of the present invention gathers bright chrominance information and analyzes and obtains public bright chromatic value by LED display module is sampled, then sets light tone degree correction target value for the required pixel correction coefficient of follow-up generation LED display module to be corrected according to this public bright chromatic value; Even like this can so that the LED display module of different batches for example LED lamp plate or LED casing also can have higher light tone degree consistance and homogeneity.
By the detailed description below with reference to accompanying drawing, it is obvious that other side of the present invention and feature become.But it should be known that the only object design for explaining of this accompanying drawing, rather than as the restriction of scope of the present invention, this is because it should be with reference to additional claim.Should also be appreciated that, unless otherwise noted, the unnecessary accompanying drawing of drawing to scale, they only try hard to illustrate conceptually structure described herein and flow process.
Accompanying drawing explanation
Fig. 1 is the public chromatic value acquisition pattern principle schematic that the light tone degree bearing calibration of a kind of LED display module of the embodiment of the present invention is associated.
Fig. 2 is the public chromatic value correcting mode principle schematic that the light tone degree bearing calibration of a kind of LED display module of the embodiment of the present invention is associated.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Particularly, the light tone degree bearing calibration of a kind of LED display module that the embodiment of the present invention proposes, comprises the following steps S1 to step S4:
Step S1: the bright chrominance information that gathers at least one sample extracting from a plurality of LED display modules.In the present embodiment, described a plurality of LED display modules belong to different batches, and described at least one sample is to be taken from different batches, and the quantity of the sample extracting in each batch can extract according to certain percentage.Single led display module comprises a plurality of pixels, and it can be LED lamp plate or LED casing, and single led casing can comprise one or more LED lamp plates and conventionally with display control card; Preferably, LED lamp plate is to be provided with for example LED lamp plate of flash memory of storer; Single pixel comprises one or more LED, situation for a plurality of LED, it is for example to comprise redness (R), green (G), blue (B) three kinds of color LED, even can also comprise white (W) LED or yellow (Y) LED, can certainly only comprise two kinds of color LED.In addition, each LED display module for same batch, the same color LED that it adopts has identical or close thing item number conventionally, so relatively can guarantee to have the identical or close characteristics of luminescence with the same color LED in each pixel in batch each LED display module.
In addition, in gathering described at least one sample in the process of the bright chrominance information of each sample, need to control each sample and sequentially show different color pictures, and be preferably sprite or pure color picture, for example control this sample and first show red picture, show green picture again, then show blue picture, even further display white picture; When various monochromes or pure color picture disply, utilize light tone degree collecting device to take to obtain proofreading and correct required shades of colour correction image to each picture, the shooting number of times of certain color picture of the same race does not limit, as long as can photograph the image meeting the demands; For example, to taking shades of colour (R, G, the B) correction obtaining, with image, carrying out the bright chrominance information that graphical analysis can obtain this sample afterwards, for example, is the bright chrominance information of primary colours of each pixel of this sample, comprises monochrome information and chrominance information.Wherein, monochrome information for example represents with brightness value, chrominance information for example represents with cie color coordinate, light tone degree collecting device is for example the combination of area array cameras and colorimeter, area array cameras wherein can be used for obtaining the relatively bright chrominance information of each pixel in shades of colour picture, and colorimeter can be used for obtaining the accurate bright chrominance information of the partial pixel point in shades of colour picture, recycle afterwards the accurate bright chrominance information of this partial pixel point and the difference of relative bright chrominance information and demarcate the bright chrominance information that can obtain this sample after the relatively bright chrominance information of each pixel in shades of colour picture.Be understandable that, the employing of colorimeter can promote the degree of accuracy of bright chrominance information, but the present invention does not get rid of the situation that does not adopt colorimeter; In addition, the present invention does not get rid of described a plurality of LED display module yet and belongs to the situation of same batch.
Step S2: the public bright chromatic value that chrominance information analysis is obtained described at least one sample of lighting to described at least one sample, and set a light tone degree correction target value according to described public bright chromatic value.In the present embodiment, take a plurality of samples as example: (1) can be in the following way for the analysis of the monochrome information in the bright chrominance information of a plurality of samples: the brightness value for each pixel in the bright chrominance information of single sample first carries out normal distribution analysis to remove the too low pixel of brightness value, then the brightness value of residual pixel point is averaging and obtains the average brightness of this sample; Get again afterwards minimum value in the average brightness of each sample as the public brightness value of described a plurality of samples, or for example, after the minimum value in the average brightness of each sample is suitably adjusted certain percentage (raising 0～20%) as the public brightness value of described a plurality of samples; And every kind of color LED in described a plurality of sample can a corresponding public brightness value.In addition, (2) can be in the following way for the analysis of the chrominance information in the bright chrominance information of a plurality of samples: for the chrominance information of each pixel in the bright chrominance information of single sample, first according to the cie color coordinate of each pixel, obtain corresponding colour gamut, reentry each pixel colour gamut common color gamut and obtain the colour gamut of single sample, for example the colour gamut CG1 in Fig. 1, CG2; Obtain again afterwards the common color gamut of the colour gamut (for example CG1, CG2) of described a plurality of samples, for example the common color gamut CG0 in Fig. 1 public domain of CG1 and two delta-shaped regions of CG2 (also with regard to).So far, the corresponding cie color coordinate of the public brightness value of aforementioned obtained described a plurality of samples and common color gamut CG0 can form the public bright chromatic value of described a plurality of samples.
Afterwards, for how to set a light tone degree correction target value according to the public bright chromatic value of described a plurality of samples, can adopt following two kinds of situations (a) and (b).(a) using the public bright chromatic value of described a plurality of samples directly as described light tone degree correction target value.(b) set a brightness and sacrifice number percent, also sacrifice the certain percentage of public brightness value; The setting of sacrificing number percent corresponding to this brightness, public chromatic value also can be done corresponding variation; Example as shown in Figure 2, the colour gamut that after what-if, the public chromatic value of gained is corresponding is CGa, when setting brightness sacrifice number percent, be 8% (being also that public brightness value sacrifices 8%), the scope that colour gamut CGb and colour gamut CGb are positioned at colour gamut CGa is changed in the mutually deserved meeting of colour gamut CGa, and the corresponding cie color coordinate of colour gamut CGb after changing is revised public chromatic value; Afterwards can be using revised public brightness value and public chromatic value as described light tone degree correction target value.
Step S3: the bright chrominance information that one of gathers in described a plurality of LED display module LED display module to be corrected.In the present embodiment, the part in LED display module to be corrected and aforementioned a plurality of sample belongs to same batch.And the acquisition mode of the bright chrominance information of this LED display module to be corrected, can be identical with the acquisition mode of the bright chrominance information of aforementioned a plurality of samples, it is roughly: control LED display module to be corrected and sequentially show that a plurality of different color pictures and color picture are preferably sprite or pure color picture, and utilize light tone degree collecting device take described a plurality of different color pictures and carry out graphical analysis to obtain the bright chrominance information of LED display module to be corrected, be for example the bright chrominance information of primary colours of each pixel.
Step S4: the pixel correction coefficient that calculates described LED display module to be corrected according to the described bright chrominance information of described LED display module to be corrected and described light tone degree correction target value is for proofreading and correct the light tone degree of described LED display module to be corrected.In the present embodiment, utilize correction software can calculate the correction coefficient of each pixel of LED display module to be corrected according to described light tone degree correction target value and the difference of the bright chromatic value of the LED display module to be corrected collecting, referred to herein as pixel correction coefficient, the correction coefficient of single pixel is generally a matrix of coefficients.
Afterwards, the pixel correction coefficient of the LED module to be corrected calculating can be sent and is stored to this LED display module to be corrected.
More specifically, when LED display module to be corrected is the LED casing with display control card, pixel correction coefficient can be stored in the storer on display control card.It should be noted that, when this LED display module to be corrected is applied to LED display synchro system, this display control card can be the receiving card being connected between sending card and LED lamp plate; When this LED display module to be corrected is applied to LED display asynchronous system, this display control card can be the receiving card being connected between Asynchronism Card and LED lamp plate, also can refer to receiving card function and the Asynchronism Card that is connected with LED lamp plate.
In another embodiment, when LED display module to be corrected is the LED lamp plate that is provided with storer, pixel correction coefficient can be stored in the storer on LED lamp plate, and storer is herein such as being the nonvolatile memories such as flash memory.It is worth mentioning that, pixel correction coefficient is stored on LED lamp plate, the display control card that the LED casing being spliced into by LED lamp plate uses can not have uniqueness, or from another angle, even if the display control card of LED casing is changed also without to LED casing again storage pixel point calibration coefficient, because it can directly read from LED lamp plate.
In another embodiment, the identifier of the pixel correction coefficient of LED display module to be corrected and this LED display module to be corrected can also be associated together and be stored to database, as later maintenance Backup Data.Herein, the identifier of LED display module to be corrected can be by Software Create, or is to obtain by scanning the label of LED display module to be corrected.Wherein, the label of LED display module to be corrected can be paper labels, can be also electronic tag.
In addition, in other embodiments, can also suitably change the analytical approach of the public bright chromatic value of described a plurality of samples, for example, in obtaining the process of public brightness value, can first to the brightness value of the color LED of the same race of whole pixels of described a plurality of samples, do respectively normal distribution and analyze the average brightness of removing the too low pixel of brightness value and the brightness value of residual pixel point being averaging respectively to the every kind of color LED that obtains described a plurality of samples, again after the average brightness of the average brightness of every kind of color LED or every kind of color LED is suitably adjusted certain percentage as the public brightness value of every kind of color LED of described a plurality of samples, certainly, similarly, in obtaining the process of public chromatic value, can first obtain the colour gamut corresponding to cie color coordinate of whole pixels of described a plurality of samples, the common color gamut of these colour gamuts of reentrying can obtain the common color gamut of described a plurality of samples, and cie color coordinate corresponding to this common color gamut can be used as the public chromatic value of described a plurality of samples, the conversion that these are suitable, all belongs to protection scope of the present invention.
In other embodiments, for the collection of the bright chrominance information of sample, also can only gather the bright chrominance information of its regional area, and with the bright chrominance information of this regional area, carry out the bright chrominance information of representative sample; For example utilize bright colorimeter to take the regional area of each color picture that sample shows and obtain a brightness value and the chromatic value corresponding to each color picture, thereby the brightness value of each color picture and the combination of chromatic value can be used as the bright chrominance information of this sample.Similarly, for LED display module to be corrected, also can adopt identical acquisition mode.Certainly, the way that only gathers regional area is to be generally applied in the situation that the bright chrominance information of sample/LED display module to be corrected can represent by the bright chrominance information of this regional area.
In sum, the embodiment of the present invention gathers bright chrominance information and carries out statistical study by LED display module is sampled and obtains public bright chromatic value, then sets light tone degree correction target value for the required pixel correction coefficient of follow-up generation LED display module to be corrected according to this public bright chromatic value; Like this can be so that even the LED display module of different batches also can have higher light tone degree consistance and homogeneity.
Applied specific case herein principle and the embodiment of the light tone degree bearing calibration of LED display module of the present invention are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention; all will change in specific embodiments and applications; in sum, this description should not be construed as limitation of the present invention, and protection scope of the present invention should be as the criterion with appended claim.
Claims (11)
1. a light tone degree bearing calibration for LED display module, is characterized in that, comprises step:
The bright chrominance information of at least one sample that collection is extracted from a plurality of LED display modules;
The described bright chrominance information analysis of described at least one sample is obtained to the public bright chromatic value of described at least one sample, and set a light tone degree correction target value according to described public bright chromatic value;
One of gather in described a plurality of LED display module the bright chrominance information of LED display module to be corrected; And
The pixel correction coefficient that calculates described LED display module to be corrected according to the described bright chrominance information of described LED display module to be corrected and described light tone degree correction target value is for proofreading and correct the light tone degree of described LED display module to be corrected.
2. the light tone degree bearing calibration of LED display module as claimed in claim 1, is characterized in that, described LED display module to be corrected is the LED casing with display control card, and the bearing calibration of described light tone degree also comprises step:
The described pixel correction coefficient of described LED display module to be corrected is sent and is stored in the storer on the described display control card of described LED display module to be corrected.
3. the light tone degree bearing calibration of LED display module as claimed in claim 1, is characterized in that, described LED display module to be corrected is the LED lamp plate that is provided with storer, and the bearing calibration of described light tone degree also comprises step:
The pixel correction coefficient of described LED display module to be corrected is sent and is stored in the described storer of described LED display module to be corrected.
4. the light tone degree bearing calibration of LED display module as claimed in claim 1, is characterized in that, also comprises step:
Send and store described pixel correction coefficient to described LED display module to be corrected.
5. the light tone degree bearing calibration of the LED display module as described in claim 1 to 4 any one, is characterized in that, also comprises step:
Obtain the identifier of described LED display module to be corrected; And
Described pixel correction coefficient and the described identifier of described LED display module to be corrected are associated together and are stored to database.
6. the light tone degree bearing calibration of LED display module as claimed in claim 5, is characterized in that, the step that obtains the identifier of described LED display module to be corrected comprises:
Utilize Software Create and obtain described identifier or scan the label of described LED display module to be corrected and obtain described identifier.
7. the light tone degree bearing calibration of LED display module as claimed in claim 1, is characterized in that, the step that gathers the bright chrominance information of at least one sample extracting from a plurality of LED display modules comprises:
Each sample of controlling in described at least one sample sequentially shows a plurality of different color pictures; And
Take described a plurality of different color picture to obtain the described bright chrominance information of described at least one sample.
8. the light tone degree bearing calibration of LED display module as claimed in claim 7, is characterized in that, takes described a plurality of different color picture and comprises to obtain the step of the described bright chrominance information of described at least one sample:
Take the regional area of color picture described in each to obtain the bright chrominance information of described regional area, and the described bright chrominance information using the described bright chrominance information of described regional area as corresponding sample.
9. the light tone degree bearing calibration of LED display module as claimed in claim 1, is characterized in that, the step of setting a light tone degree correction target value according to described public bright chromatic value comprises:
Described public bright chromatic value is set as to described light tone degree correction target value.
10. the light tone degree bearing calibration of LED display module as claimed in claim 1, is characterized in that, the step of setting a light tone degree correction target value according to described public bright chromatic value comprises:
According to a light tone of described public bright chromatic value and setting, sacrifice number percent and obtain revised public bright chromatic value, and using described revised public bright chromatic value as described light tone degree correction target value.
The light tone degree bearing calibration of 11. LED display modules as claimed in claim 1, is characterized in that, the step that gathers the bright chrominance information of at least one sample extracting from a plurality of LED display modules comprises:
Be subordinated in described a plurality of LED display modules of different batches and extract a plurality of samples; And
Gather the bright chrominance information of described a plurality of samples.
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