CN101719362A - Colour calibration method of display unit - Google Patents
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Abstract
The invention discloses a colour calibration method of a display unit, comprising the following steps: setting a splicing wall to display pure-colour pictures in turn; shooting the pure-colour pictures and establishing the position corresponding relationships of the pixels of the splicing wall in the photo to the pixels of the actual splicing wall; calibrating photos according to a pre-set calibration line; establishing a general table for storing the colour values and setting the initial colour value in the general table as the photo colour value; adjusting the colour values of the pixels at the splicing joint of the splicing wall in the photo and updating the general table; separating the data corresponding to the display units according to the general table and transmitting the data to each display unit; when the display units work normally, decomposing the display data of each pixel into three primary colours and respectively inquiring the colour value in the sub-tables with the same primary colour; if the inquired colour value is less than the colour value currently displayed by the display unit, adjusting the display unit to display the inquired colour value; otherwise, not adjusting. The invention can locally adjust the display units and practically satisfies the requirement on consistent colour adjustment.
Description
Technical field
The present invention relates to the image display technology field, be specifically related to a kind of colour calibration method of display unit.
Background technology
At application number is 200710028437.6, publication number is in the patented claim of CN101076128, a kind of multi-screen splicing wall means for correcting and method are disclosed, this device comprises the means for correcting that the main control module by photographing module, view data cache module, reception and the object computer order of extracting screen color information constitutes jointly, and computing machine.Photographing module is connected with compunication with the display screen of multi-screen splicing wall respectively by the main control module with the view data cache module.In disclosed this technical scheme, the bearing calibration of multi-screen splicing wall is: each display unit of display screen of setting multi-screen splicing wall is respectively the demonstration assigned picture, take at least one pictures by photographing module and be stored in the view data cache module, computing machine extracts the colouring information of each display unit from picture, do correction according to each display unit color distortion.
Combination generally has M * N display unit to form, and has color distortion between each display unit, reaching such separating under the bigger situation more than the 100mm at interval, is not easy to see color distortion; But be close together when between the display unit, for example the interval is when 1mm is following, and the color distortion that can discover is very obvious.In the bearing calibration of above-mentioned multi-screen splicing wall, with highest brightness value as a comparison, adjust the consistance of adjacent display cell.And there is the relation of gamma curve in the brightness of the numerical value brightness of optics and human eye, corresponding red, the green and blue different gamma curve relation that also exists, and corresponding the appointment also has different gamma curve relations in the limited range.So,, just can't really realize the colour consistency adjustment if setting range does not comprise the above-mentioned all situations of mentioning.
In addition, existing calibration steps is only adjusted display unit is whole, but there is unevenness in the brightness of each display unit three primary colours, since the technical difficulty height, realization means complexity, and traditional calibration steps does not carry out part adjustment to display unit.
Summary of the invention
The objective of the invention is to, propose a kind of colour calibration method of display unit, can solve the drawback of prior art, each display unit is carried out part adjustment, really satisfy colour consistency and adjust requirement.
The display unit color adjustment method that the present invention proposes comprises:
Step S1, according to red, green and blue three kinds of primary colours, every kind of primary colours comprise 256 grades of gray scales at the most, show the pure color picture that comprises single primary colours and single gray scale successively at actual combination;
Step S2 takes described pure color picture, sets up each pixel of combination and each locations of pixels corresponding relation of actual combination in the photo;
Step S3, default lubber-line comparison film carries out brightness calibration, make brightness calibration after photo color value curve identical with described lubber-line, or the error of this color value curve and described lubber-line is below the two-stage gray scale;
Step S4, foundation is used to store total form of color value according to described position corresponding relation, and color value initial in total form all is set to the color value of described photo;
Step S5, the horizontal or longitudinal spliced seam of combination place in photo selects a pair of neighbor P1 and the P2 that is not positioned at identical display unit to carry out the adjustment of color value arbitrarily; Wherein, adjustment process comprises: relatively whether the color value of P1 and P2 equates, if equate then not do any adjustment, otherwise, when the color value of P1 and P2 relation satisfies P1＞P2, in other photos of identical primary colours, seek reference pixel P, P be identical with P1 position in photo and with the hithermost pixel of P2 color value; The new color value of P1 is adjusted into identical, and in described total form, upgrades with the color value of P;
Step S6, according to described adjustment process, the pixel at all horizontal or longitudinal spliced seam places of combination is carried out the adjustment of color value in the comparison film, and upgrades color value in described total form;
Step S7 isolates the data of corresponding each display unit and is sent to each display unit according to described total form, is red sub form, green sub form and the blue form that divides at each display unit with the data separating that receives; When the display unit operate as normal, each pixel display data is resolved into three kinds of primary colours, in the branch form of identical primary colours, inquire about color value respectively, if the color value that inquiry obtains less than the color value of current demonstration, is adjusted this display unit by the color value that inquiry obtains; Otherwise, do not do any adjustment.
After the present invention calibrates at the photo of taking the acquisition combination and to it, set up the total form that is used to store color value according to photo, two kinds of modes of setting up form are proposed, a kind of is the adjustment parameter that the interior pixel of form comprises three kinds of primary colours, adjusts the degree of parameter for according to the gamma curve of this primary colours correspondence this color of pixel value being adjusted; Another kind is according to three kinds of primary colours, and various primary colours comprise the gamma curve of 256 grades of gray scale correspondences at the most and set up corresponding form respectively.Form according to this sample loading mode foundation, make setting range cover all situations, make adjust through this mode after, optical brightness satisfies corresponding gamma curve relation with human eye brightness, and optical brightness and corresponding redness, green and blue gamma curve concern and also can be met.And the present invention by select to be positioned at laterally or longitudinally the neighbor at splicing seams place carry out the comparison of color value, according to comparative result, seek reference pixel, adjust the bigger pixel of color value in the neighbor by the color value of reference pixel, and other pixels of one's own profession or these row are adjusted according to similar process, the final color value adjustment that realizes all display unit splicing seams of combination allows display unit through such part adjustment, realizes the consistent result of color adjustment.
Description of drawings
Fig. 1 is the process flow diagram of display unit method of adjustment.
Embodiment
Embodiment 1:
In the present embodiment, combination is spliced by 3 * 3 display unit, and the resolution of each display unit is 1024 * 768, and the whole resolution of this combination is 3072 * 2304.
As shown in Figure 1, Fig. 1 is the process flow diagram of display unit method of adjustment in the present embodiment.Below this process is described in detail:
Step S1, according to red, green and blue three kinds of primary colours, each primary colours is 256 grades of gray scales at the most, show the pure color picture that comprises single primary colours and single gray scale successively at combination.Every kind of primary colours can comprise multi-stage grey scale, 64,128 or 256 grades of gray scales for example, but be up to 256 grades of gray scales.Present embodiment is an example with 256 grades of gray scales, and every pure color picture has only single primary colours and single gray scale, will show 3 * 256=768 pictures like this.
Step S2 takes the pure color picture, sets up each pixel of combination and each locations of pixels corresponding relation of actual combination in the photo.Because the whole resolution of combination is 3072 * 2304, the resolution that covers the photo of the whole displaying contents of combination also is 3072 * 2304, all photos that storage is taken.To the photo of taking, be example with the photo of redness, represent the photo numbering with i, i=0-255, so red photo i.bmp represents that it is the photo of primary colours that the i that takes opens with the redness, and is same, and the photo of other two kinds of primary colours also available green photo i.bmp and blue photo i.bmp is represented.For the foundation of position corresponding relation, this position corresponding relation can be corresponding one by one, promptly is arranged in the pixel of photo combination the 769th row the 1023rd row, and the pixel that is listed as with actual combination the 769th row the 1023rd is corresponding; This position corresponding relation can also be the corresponding relation of one-to-many, for example, is arranged in the pixel of photo combination the 769th row the 1023rd row, and it is corresponding being in actual combination the 769th row the 1023rd certain contiguous pixels group of row with the center; This position corresponding relation can also be many-to-one corresponding relation, and for example, the center is in certain contiguous pixels group of photo the 769th row the 1023rd row, and the pixel that is listed as with actual combination the 769th row the 1023rd is corresponding.Present embodiment takes to concern one to one the elaboration of carrying out the technical program.Relation can be calibrated by comparison film resolution one to one, makes the resolution of these photos approach 3072 * 2304 resolution, and the pixel and the pixel on the display unit that finally reach on the photo are to concern one to one.
Step S3, default lubber-line, brightness calibration is carried out in the brightness of comparison film, makes behind the brightness calibration color value curve of photo identical with lubber-line, and perhaps the error of this color value curve and lubber-line is in the two-stage gray scale.When the camera lens of video camera over against the combination center, and combination shows that situation is even, but because the difference of screen viewing angle, and camera lens can be near than the distance to the corner to the distance at combination center, make that taking the photo that obtains may cause the center brighter, and corner location can be dark.So default lubber-line is calibrated according to the lubber-line comparison film.
Between step S3 and next step S4, can also carry out following steps: between the minimum color value of the photo behind the brightness calibration and the highest color value, select a color value as the reference color value arbitrarily, the color of pixel value greater than the reference color value in this photo is modified to the reference color value.Because not having the data of calibration is the data of a distortion, center section is big, and peripheral part is little, carries out the rapid operation of previous step and can produce than mistake, carries out this step and can further reduce error.
As the further improvement of above-mentioned optimization step, can choose middle color value as the reference color value in the photo behind brightness calibration.If choose minimum color value as the adjustment standard, then adjusted brightness meeting reduces a lot, if choose the highest color value as the adjustment standard, will make most of zone to adjust.So color value will make adjustment back overall brightness be guaranteed as the adjustment standard in the middle of adopting.In red photo 255.bmp, be that j is capable with corresponding display position, k row, be expressed as R255 (j, k), wherein, j=0-2303, k=0-3071.Herein with the middle color value 250 of red photo 255.bmp as with reference to color value R
k, with in this photo greater than R
kPixel color value all be modified to R
kIf the 1011st row, pixel R255 (1011, the 1701) color value of the 1701st row is 253, and then the color value with R255 (1011,1701) is modified to 250.Equally, in this photo, color value all is modified to 250 greater than 250 pixel.Because display only allows brightness is turned down, brightness can not be heightened, so the pixel of color value in the middle of being less than or equal to is not then done any adjustment.
Step S4 sets up the total form that is used to store color value according to the position corresponding relation, and the color value of each pixel storage of total form all is set to the color value of photo.For the mode of setting up of form, technical scheme of the present invention proposes two kinds of implementations, but is not limited to this.
First kind is according to the position corresponding relation, for example, pixel on photo and the pixel on the display unit are when concerning one to one, set up and each pixel of photo identical form that puts in order, the color value of each pixel storage of form comprises redness, green and blue three kinds of adjustment parameters, and each adjustment parameter is 8 data, and value is-128～128, negative number representation reduces, and positive number is represented to increase.Each adjusts the degree of parameter for according to the gamma curve of this primary colours correspondence this color of pixel value being adjusted.Adjusting parameter with redness is example, if the red adjustment of some pixels parameter value is 0, expression is not adjusted this color of pixel value according to red corresponding gamma curve; If some red adjustment parameter values are 127, expression is carried out considerably less adjustment according to red corresponding gamma curve to this pixel, and the ratio of adjustment is 127/128 ratio; If some red adjustment parameter values are-84, represent the adjustment that these pixel needs are bigger, need the brightness of this pixel is reduced to 84/128=56.0%, in like manner,, then need this pixel intensity is increased to 56.0% if should the redness adjusted value be 84.Such storage mode is comparatively accurate, but the data volume of corresponding generation is also big.
Second kind is according to the position corresponding relation, and according to three kinds of primary colours, various primary colours comprise the gamma curve of 256 grades of gray scale correspondences at the most and set up corresponding form respectively.Herein with the corresponding number of greyscale levels of gamma curve be with step S1 in to set gray-scale displayed progression identical, be to set the pure color picture show 256 grades of gray scales successively among the step S1, then be to set up form according to the gamma curve that every kind of primary colours comprise 256 grades of gray scale correspondences herein; If set the pure color picture that shows 128 grades of gray scales successively among the step S1, then be to set up form according to the gamma curve that every kind of primary colours comprise 128 grades of gray scale correspondences herein.Like this, can make form and photo reach relation one to one, for ensuing calibration process is got ready.Present embodiment is set up form according to the gamma curve that every kind of primary colours comprise 256 grades of gray scale correspondences, each gamma curve is exactly a table of storing 256 data, by each data is 10 bits, take storer 3 * 255 * 256 * 10=1958400 position, the storage that then such mode of storing takies is less, belongs to a kind of design of simplification.
Present embodiment is set up the form that is used to store color value according to above-mentioned first method earlier, photo with shooting is that red photo 255.bmp is an example, the red form 255.tab of the form called after of setting up, putting in order of red form 255.tab is identical with red photo 255.bmp, and form has been stored 3072 * 2304=7077888 color of pixel value altogether.The color value of each pixel storage of red form 255.tab all is set to the color value 255 of photo.Equally, to red photo i.bmp, green photo i.bmp or blue photo i, bmp, all each color of pixel value of form of correspondence is set to corresponding i earlier.
Step S5, at red photo 255.bmp splicing seams place laterally or longitudinally, splicing seams herein be with combination on corresponding horizontal or longitudinal spliced seam, select a pair of neighbor P1 and the P2 that is not positioned at identical display unit arbitrarily.Choose among the red photo 255.bmp pixel R255 (769,1023) that represents with P1, and this a pair of neighbor that is in longitudinal spliced seam of pixel R255 (769,1024) of representing with P2 herein.Relatively whether this color value to neighbor of P1 and P2 equates earlier, if equate, does not just need to adjust.If comparative result is unequal, the color value of supposing R255 (769,1023) herein is greater than R255 (769,1024) color value,, when promptly the color value of P1 and P2 relation satisfies P1＞P2, then be the red searching reference pixel P in other photos of primary colours that is equally, require reference pixel P identical with the P1 position, and the most close with the P2 color value, for example, can seek R254 (769 at red photo 254.bmp, 1023) color value of R254 (769,1023) and P2, and relatively; In red photo 253.bmp, seek R253 (769,1023), and compare the color value of R253 (769,1023) and P2.By that analogy, up to finding and the hithermost pixel of R255 (769,1024) color value, pixel R251 (769,1023) on for example red photo 251.bmp, then R251 (769,1023) be reference pixel P, will carry out according to reference pixel R251 (769,1023) the adjustment of P1.The color value of reference pixel P is 251, than low 4 ranks of color value 255 of P1, then the new color value of P1 is adjusted into identical with the color value of reference pixel P, at form the 769th row of red form 255.tab, insert new color value 251 in the 1024th row, upgrade this form then.Why only the big pixel of color value being adjusted, is because the characteristics of display unit self are merely able to the brightness of part is turned down when adjusting, but the brightness of part can not be heightened.
As further improvement, between step S5 and next step S6, can also comprise step: the threshold value setting range is set to above-mentioned steps S5; When the color value of P1 and P2 relation satisfies P1＞P2,, to carrying out the adjustment of color value, and upgrade total form with P1 homonymy and other pixels in the threshold value setting range according to adjustment process.Because display unit self, so whole adjustment is to carry out toward a side of P1 pixel, promptly R255 (769,1023) side is carried out, at the color value of R255 (769,1023) greater than R255 (769, under the situation of color value 1024), the direction of adjustment is to turn left to carry out.But can be according to by the threshold value setting range be set, the scope of for example selecting 128 pixels of empirical value is as the threshold value setting range, 128 pixels occupy 1/8 in horizontal 1024 pixels, if select to lack than 128 pixels, the setting range of 10 pixels for example is then concerning the display of 60 inches of display unit employings, only has only 10mm, when adjacent display cell luminance difference distance was big, eyes are the saltus step of brightness as can be seen, the sensation that just has the brightness gradual change to have some setbacks.When but the setting of threshold value setting range is big, can correspondingly bring the increase of adjusting workload.So, the whole R255 (769 that is adjusted at, 1023) carry out in the scope of 128 pixels in left side, make in the scope of 128 pixels, from R255 (769,1022) until R255 (769,896), color of pixel value greater than R255 (769,1024) color value is all approached to this pixel, realizes the adjustment band of a brightness gradual change.
Step S6, all are adjusted at the splicing seams place laterally or longitudinally according to the corresponding combination of step S5 comparison film, and upgrade corresponding color value in red form 255.tab.
If the color value of R255 (769,1023) is less than the color value of R255 (769,1024), then whole adjustment is then turned right and is carried out, and promptly carries out toward the scope of R255 (769, a 1024) side.
All pixels that are in horizontally-spliced seam place are carried out possible adjustment to other.All are in the pixel at longitudinal spliced seam place, also can carry out, do not repeat them here according to similar method.Horizontally-spliced adjacent for having, longitudinal spliced adjacent pixels is arranged again, can adjust longitudinally more earlier according to horizontal adjustment.
Further improvement as above-mentioned adjustment splicing seams place color value process, between step S6 and S7, can also comprise step: detect the splicing seams place and whether have the color value saltus step through the color value of adjusting, to the color value gap of neighbor is situation more than at least 2 grades of gray scales, carries out the calibration of color value and upgrade corresponding color value in form.It is acceptable that color value differs 1 grade of gray scale, but differs 2 gray scales or when above, then need carry out the calibration of color value according to the principle of progressively approaching, and realizes reaching conforming requirement after the color value adjustment.
Above process has been finished the adjustment to red photo 255.bmp, forms red form 255.tab.
Then according to the method described above to red photo 254.bmp, red photo 253.bmp ..., photo such as red photo 0.bmp adjusts, form respectively the new color value of storage red form 254.tab, red form 253.tab ..., form such as red form 0.tab.
Equally, also will to green photo 255.bmp, green photo 254.bmp ..., photo such as green photo 0.bmp adjusts, form respectively the new color value of storage form green form 255.tab, green form 254.tab ..., form such as green form 0.tab.
Equally, also will to blue photo 255.bmp, blue photo 254.bmp ..., photo such as blue photo 0.bmp adjusts, form respectively the blue form 255.tab of form of the new color value of storage, blue form 254.tab ..., form such as blue form 0.tab.
Step S7, according to red form 255.tab, green form 255.tab and these 3 forms of blue form 255.tab, the synthetic new picture RGB255.bmp that comprises redness, green and blue three kinds of primary colours, because the resolution of new picture is 3072 * 2304, isolate the data of the display unit of corresponding each 1024 * 768 resolution according to this picture.In abovementioned steps, add up to and finish 3 * 256 adjustment forms, each table size is 7077888 bytes, needs 5435817984 bytes altogether.Combination is spliced by 3 * 3 display unit, is assigned to 9 display units, each display unit 603979776 byte.Then data are sent to each display unit, the FPGA in the display unit can be divided into red sub form, blue form and the green sub form of dividing according to three kinds of primary colours with the data that receive then.During the display operate as normal, can carry out the inquiry of color value respectively by the branch form of identical primary colours, for example to certain display unit, the 356th row on this display unit, the red color value of the 1023rd pixel that lists is 234, then inquires about in red corresponding form, if the color value that inquiry obtains is less than the color value 234 of current demonstration, for example have only 230, represent that then the red color value of this pixel on the display unit will reduce by 4 gray scales; If the color value that inquiry obtains is greater than 234 or equal 234, then do not need to adjust.
As further optimization to step S7, be sent in the process of each display unit in data corresponding each display unit, can be divided into some homalographic fritters according to the resolution of display unit, then fritter is sent to corresponding display unit.With display unit resolution is 1024 * 768 to be example, can be divided into 64 * 48 pieces, the every fritter of representing 16 * 16 pixels, 64 * 48=3072 fritter altogether.By 3 kinds of primary colours of each fritter record, 256 grades of gray scales of every kind of primary colours need 64 * 48 * 256 * 3=2359296 byte altogether.Comparing needs 603979776 bytes in the elaborate schemes, reduced 256 times.Make physical circuit realize easily.And when carrying out the color value inquiry according to the fritter of 16 * 16 pixels, the color value of getting is the evaluation of estimate of correspondence position 16 * 16 color of pixel values in the form.
In order further to reduce data volume, be divided into 16 * 12 pieces according to display unit resolution 1024 * 768, the every fritter of representing 256 * 256 pixels, 16 * 12=192 fritter altogether.By 3 kinds of primary colours of each fritter record, 256 grades of gray scales of every kind of primary colours need 16 * 12 * 256 * 3=147456 byte altogether.
Through above-mentioned adjustment, both solved the drawback of prior art, can carry out part adjustment to each display unit again, really satisfy colour consistency and adjust requirement.
Above-described embodiment of the present invention does not constitute the qualification to protection domain of the present invention.Any modification of being done 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 (8)
1. a colour calibration method of display unit is characterized in that, comprising:
Step S1, according to red, green and blue three kinds of primary colours, every kind of primary colours comprise 256 grades of gray scales at the most, show the pure color picture that comprises single primary colours and single gray scale successively at actual combination;
Step S2 takes described pure color picture, sets up each pixel of combination and each locations of pixels corresponding relation of actual combination in the photo;
Step S3, default lubber-line comparison film carries out brightness calibration, make brightness calibration after photo color value curve identical with described lubber-line, or the error of this color value curve and described lubber-line is below the two-stage gray scale;
Step S4, foundation is used to store total form of color value according to described position corresponding relation, and color value initial in total form all is set to the color value of described photo;
Step S5, the horizontal or longitudinal spliced seam of combination place in photo selects a pair of neighbor P1 and the P2 that is not positioned at identical display unit to carry out the adjustment of color value arbitrarily; Wherein, adjustment process comprises: relatively whether the color value of P1 and P2 equates, if equate then not do any adjustment, otherwise, when the color value of P1 and P2 relation satisfies P1＞P2, in other photos of identical primary colours, seek reference pixel P, P be identical with P1 position in photo and with the hithermost pixel of P2 color value; The new color value of P1 is adjusted into identical, and in described total form, upgrades with the color value of P;
Step S6, according to described adjustment process, the pixel at all horizontal or longitudinal spliced seam places of combination is carried out the adjustment of color value in the comparison film, and upgrades color value in described total form;
Step S7 isolates the data of corresponding each display unit and is sent to each display unit according to described total form, is red sub form, green sub form and the blue form that divides at each display unit with the data separating that receives; When the display unit operate as normal, each pixel display data is resolved into three kinds of primary colours, in the branch form of identical primary colours, inquire about color value respectively, if the color value that inquiry obtains less than the color value of current demonstration, is adjusted this display unit by the color value that inquiry obtains; Otherwise, do not do any adjustment.
2. colour calibration method of display unit according to claim 1, it is characterized in that, between step S3 and step S4, also comprise step: between the minimum color value of the photo behind the brightness calibration and the highest color value, select a color value as the reference color value arbitrarily, the color of pixel value greater than described reference color value in this photo is modified to described reference color value.
3. colour calibration method of display unit according to claim 2 is characterized in that, color value is as described reference color value in the middle of choosing in the photo behind brightness calibration.
4. colour calibration method of display unit according to claim 3, it is characterized in that, the process of setting up the total form be used to store color value according to described position corresponding relation among the step S4 specifically comprises: set up the total form that is used to store color value according to described position corresponding relation, the color value of each pixel storage comprises the adjustment parameter of three kinds of primary colours in total form, the degree of described adjustment parameter for according to the gamma curve of this primary colours correspondence this color of pixel value being adjusted.
5. colour calibration method of display unit according to claim 3, it is characterized in that, the process of setting up the form be used to store color value according to described position corresponding relation among the step S4 specifically comprises: according to described position corresponding relation, according to three kinds of primary colours, various primary colours comprise the gamma curve of 256 grades of gray scale correspondences at the most and set up corresponding total form respectively.
6. according to claim 4 or 5 described colour calibration method of display unit, it is characterized in that, between step S5 and step S6, also comprise step: the threshold value setting range is set; When the color value of neighbor P1 and P2 relation satisfies P1＞P2,, to carrying out the adjustment of color value, and in described total form, upgrade color value with P1 homonymy and other pixels in the threshold value setting range according to described adjustment process.
7. colour calibration method of display unit according to claim 6, it is characterized in that, between step S6 and S7, also comprise step: detect the splicing seams place and whether have the color value saltus step through the color value of adjusting, to the color value gap of neighbor is situation more than at least 2 grades of gray scales, carries out the calibration of color value and upgrades described total form.
8. according to claim 1 or 7 described colour calibration method of display unit, it is characterized in that, the process that among the step S7 data of corresponding each display unit is sent to each display unit specifically comprises: the data of corresponding each display unit are divided into plurality of small blocks according to the resolution of display unit, then described fritter are sent to corresponding display unit.
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Address after: Kezhu road high tech Industrial Development Zone, Guangzhou city of Guangdong Province, No. 233 510670 Patentee after: Wei Chong group Limited by Share Ltd Address before: 510663 Guangzhou province high tech Industrial Development Zone, Guangdong, Cai road, No. 6, No. Patentee before: Guangdong Weichuangshixun Science and Technology Co., Ltd. |