CN106054418A - Detection method and detection device for LCD (Liquid Crystal Display) - Google Patents
Detection method and detection device for LCD (Liquid Crystal Display) Download PDFInfo
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- CN106054418A CN106054418A CN201610544177.7A CN201610544177A CN106054418A CN 106054418 A CN106054418 A CN 106054418A CN 201610544177 A CN201610544177 A CN 201610544177A CN 106054418 A CN106054418 A CN 106054418A
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- 238000001514 detection method Methods 0.000 title claims abstract description 50
- 239000004973 liquid crystal related substance Substances 0.000 title abstract description 5
- 238000000034 method Methods 0.000 claims description 14
- 230000002950 deficient Effects 0.000 claims description 13
- 230000007547 defect Effects 0.000 abstract description 13
- 238000011161 development Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 238000004891 communication Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 239000010408 film Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/1306—Details
- G02F1/1309—Repairing; Testing
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention discloses a detection method and detection device for an LCD (Liquid Crystal Display). Through utilization of a principle that the LCD cannot display a picture or displays a wrong picture when an applied MIPI (Mobile Industry Processor Interface) signal is a high frequency signal, a display defect is transformed into a picture with a bright line. The bright line is an edge of a qualified picture displayed by the LCD when the MIPI signal of preset frequency is applied. When detection is carried out, if the qualified picture is displayed below the bright line by the LCD, the LCD is judged to be qualified. If the qualified picture is not displayed below the bright line by the LCD, the LCD is judged to be disqualified. The frequency corresponding to the bright line can be adjusted. Therefore, the detection effect of the display defect of the LCD can be improved, thereby facilitating development of the high resolution of the LCD.
Description
Technical field
The present embodiments relate to technical field of liquid crystal display, be specifically related to a kind of LCD (Liquid Crystal
Display, liquid crystal display) detection method and detection device.
Background technology
Along with developing rapidly of mobile display industry, increasing electronic product use LCD as man-machine interaction window,
So that electronic product is more intelligent, hommization.Therewith, industry is also more and more higher to the prescription of LCD product.?
In LCD production process, the impact of the factor such as technique and environment, LCD may be caused to there is display defect.Currently, industry is general
Detection method be to drive LCD show and specifically test picture, on specific test picture the colored screen of check whether there is, noise,
The defects such as dim spot.Such as, check whether there is bright spot in ater picture, check whether there is green dim spot in pure green picture
Deng.But, along with improving constantly of LCD resolution, traditional detection method is poor to the Detection results of tiny flaw, can not expire
Foot modernization large-scale production requirement high-resolution to LCD.
Summary of the invention
In view of this, the present invention provides detection method and the detection device of a kind of LCD, it is possible to improve LCD display defect
Detection results, the high-resolution development of beneficially LCD.
The detection method of the LCD of one embodiment of the invention, including: on LCD to be detected, identify a bright line in advance, described
The edge of qualified picture shown by LCD when bright line is that LCD is applied have the MIPI signal of predeterminated frequency；LCD is divided into
Along preset direction arrangement multiple regions and respectively applying MIPI signal, wherein put on each described region along preset direction
The frequency of MIPI signal is less than the frequency of the MIPI signal putting on its later region, and first region is applied have volume
Determining the MIPI signal of frequency, described rated frequency is the frequency reaching the resolution of LCD MIPI signal to be applied, specified frequency
Rate is less than predeterminated frequency；The most qualified according to the picture detection LCD that LCD below bright line shows.
Alternatively, preset direction includes the direction perpendicular with the scan line opening direction of LCD.
Alternatively, the difference of the frequency of the MIPI signal that two regions of arbitrary neighborhood are applied is equal.
Alternatively, each region includes multirow pixel, and the line number of the pixel that regional includes is identical.
Alternatively, the step the most qualified for picture detection LCD that described basis LCD below bright line shows, including: judge
Below bright line, whether LCD shows qualified picture；If LCD shows qualified picture below bright line, then judge that LCD is qualified；If
Below bright line, LCD does not shows qualified picture, then judge that LCD is defective.
The detection device of the LCD of one embodiment of the invention, including: mark module, in advance at LCD subscript to be detected
Know a bright line, the limit of qualified picture shown by LCD when described bright line is that LCD is applied have the MIPI signal of predeterminated frequency
Edge；Drive module, for LCD being divided into the multiple regions arranged along preset direction and applying MIPI signal, Qi Zhongyan respectively
Preset direction puts on the frequency of the MIPI signal in each described region less than the MIPI signal putting on its later region
Frequency, and first region is applied the MIPI signal with rated frequency, described rated frequency is to reach the resolution institute of LCD
The frequency of MIPI signal to be applied, rated frequency is less than described predeterminated frequency；Detection module, for according to below bright line
The picture detection LCD that LCD shows is the most qualified.
Alternatively, preset direction includes the direction perpendicular with the scan line opening direction of LCD.
Alternatively, the difference of the frequency of the MIPI signal that two regions of arbitrary neighborhood are applied is equal.
Alternatively, each region includes multirow pixel, and the line number of the pixel that regional includes is identical.
Alternatively, described detection module judges whether LCD shows qualified picture below bright line；If LCD below bright line
Show qualified picture, then judge that LCD is qualified；If LCD does not shows qualified picture below bright line, then judge that LCD is defective.
Beneficial effect: the embodiment of the present invention utilize the MIPI signal that applied for LCD during altofrequency cannot show picture or
Display mistake picture (i.e. showing defective picture) this principle, is converted into a picture with bright line by display defect, should
The edge of qualified picture shown by LCD when bright line is to apply to have the MIPI signal of predeterminated frequency；During detection, if under bright line
Side LCD shows qualified picture, then judge that LCD is qualified；If LCD does not shows qualified picture below bright line, then judge that LCD does not conforms to
Lattice, the frequency-adjustable corresponding to bright line, therefore, it is possible to improve the Detection results to LCD display defect, beneficially LCD high-resolution
The development of rate.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of detection method one embodiment of the LCD of the present invention；
Fig. 2 is the schematic diagram of the picture with bright line formed based on method shown in Fig. 1；
Fig. 3 is the principle frame schematic diagram of the detection device of the LCD of one embodiment of the invention；
Fig. 4 is the hardware architecture diagram of the detection device of the LCD shown in Fig. 3.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the skill to each exemplary embodiment provided by the present invention
Art scheme is clearly and completely described.In the case of not conflicting, the feature in each embodiment following and embodiment can
To be mutually combined.
Refer to Fig. 1, for the detection method of the LCD of one embodiment of the invention.The detection method of described LCD can include with
Lower step S11 and S14.
S11: identify a bright line in advance on LCD to be detected, described bright line is that LCD is applied have predeterminated frequency
During MIPI (Mobile Industry Processor Interface, mobile Industry Processor Interface) signal shown by LCD
The edge of qualified picture.
Described predeterminated frequency can be considered that the LCD that manufacturer formulates is displayed without the MIPI signal applied during the picture of defect
Frequency, i.e. this predeterminated frequency can be considered that manufacturer formulates an acceptability criteria, detection during, if executed to LCD
The picture that when adding the MIPI signal being less than and being equal to this predeterminated frequency, LCD shows does not has defect, then assert that this LCD meets production mark
Standard is the most qualified；If the figure that when applying, to LCD, the MIPI signal being less than and being equal to this predeterminated frequency during detection, LCD shows
Sheet is defective, then assert that this LCD is defective.
For ease of follow-up detection operation, predeterminated frequency is converted to be intuitively shown on LCD by the embodiment of the present invention
Bar bright line, i.e. when LCD is applied have the MIPI signal of predeterminated frequency qualified picture shown by LCD (on) edge.Thus
Understanding, the embodiment of the present invention is equivalent to add a picture defects detection for LCD with bright line, in detection process
In, if LCD shows qualified picture below bright line, then assert that LCD meets production standard the most qualified；If below bright line
LCD does not shows qualified picture, then assert that LCD is defective.
This picture generating mode with bright line includes but not limited to as follows:
LCD is divided into the multiple regions along preset direction arrangement, and regional is applied the most successively MIPI signal.
Wherein, first region applying the MIPI signal with rated frequency, this rated frequency is that the resolution reaching LCD to be executed
The frequency of the MIPI signal added, such as resolution be the rated frequency of the LCD of 720*1280 be 230Hz, this rated frequency is less than
Predeterminated frequency corresponding to aforementioned bright line, and put on along preset direction regional MIPI signal frequency less than apply
Frequency in the MIPI signal in its later region.
For example, incorporated by reference to shown in Fig. 2, for LCD to be tested, the number of lines of pixels on its long limit is the pixel of V, minor face
Line number be the number of pixels on H, i.e. vertical direction be V, number of pixels in the horizontal direction be H, as the first row bottom LCD
Pixel, top are last column pixel, and LCD is applied MIPI signal by the first row pixel line by line towards last column pixel.So
Corresponding to aforementioned, described each region includes that the line number of the pixel that multirow pixel, preferably regional include is identical；Aforementioned default
Direction is towards the direction of last column pixel by the first row pixel；TFT (Thin Film in addition combined with LCD
Transistor, thin film transistor (TFT)) open theory, this preset direction also can be considered that the scan line opening direction with LCD hangs down mutually
Straight direction.
LCD is being applied during MIPI signal shows aforementioned picture, be about to the volume of MIPI signal of LCD every V/10
Determine frequency increase 10%, and will increase after MIPI signal be applied to LCD.Preferably, two described regions of arbitrary neighborhood are executed
The difference of the frequency of the MIPI signal added is equal.If manufacturer requires that the frequency at below 280Hz does not allow LCD to there is noise etc.
Display defect, then when rated frequency (230Hz) is increased to predeterminated frequency (280Hz), can show a bright line on LCD
L.Wherein, the embodiment of the present invention can form described bright line L to use the modes such as setting-out function, is not limited this.
S12: LCD is divided into the multiple regions arranged along preset direction and applies MIPI signal respectively, wherein along presetting
Direction puts on the frequency frequency less than the MIPI signal putting on its later region of the MIPI signal in each described region,
And first region is applied the MIPI signal with rated frequency, described rated frequency is that the resolution reaching LCD to be executed
The frequency of the MIPI signal added, rated frequency is less than predeterminated frequency.
This step S12 can be considered and formally detects LCD.The process that LCD applies MIPI signal see aforementioned life
Becoming the mode of picture shown in Fig. 2, here is omitted.
S13: judge whether LCD shows qualified picture below bright line.
LCD is by FPC (Flexible Printed Circuit, flexible PCB) and for applying MIPI signal
CPU (Central Processing Unit, central processing unit) connects, and FPC Yu LCD is by ACF (Anisotropic
Conductive Film, anisotropy conductiving glue or anisotropic conductive film) connect, owing to ACF has impedance, cause FPC to have
There is impedance, therefore there is between CPU and LCD connection (bonding) impedance, thus the data that CPU is transferred to LCD are formed instead
Penetrate, affect the transmission of MIPI signal.Further, the frequency of MIPI signal is the biggest, and the most described reflection is the strongest, when the frequency of MIPI signal
When reaching to a certain degree, LCD will be unable to receive correct data.It is to say, when LCD is applied certain high-frequency MIPI
During signal, LCD likely can not normally show picture or display mistake picture.
Based on this principle, if LCD does not shows qualified picture below bright line, represent that LCD is defective, i.e. perform step S14；
If LCD shows qualified picture below bright line, represent that LCD is qualified, i.e. perform step S15.
It should be noted that step S13～S15 can be considered according to whether the picture that LCD shows below bright line detects LCD
Qualified.Step S13～S15 can be by manually directly observing execution, it is possible to use AOI (Automatic Optic
Inspection, automatic optics inspection) equipment execution.
S14: judge that LCD is defective.
S15: judge that LCD is qualified.
From the foregoing, the present embodiment utilizes the MIPI signal applied cannot show picture or aobvious for LCD during altofrequency
Showing mistake picture (i.e. showing defective picture) this principle, display defect is converted into a picture with bright line, this is bright
The edge of qualified picture shown by LCD when line is to apply to have the MIPI signal of predeterminated frequency.During detection, if below bright line
LCD shows qualified picture, then judge that LCD is qualified；If LCD does not shows qualified picture below bright line, then judge that LCD is defective,
Predeterminated frequency corresponding to bright line is adjustable, therefore, it is possible to improve the Detection results to LCD display defect, beneficially LCD high score
The development of resolution.
Refer to Fig. 3, for the detection device of the LCD of one embodiment of the invention.The detection device 30 of described LCD includes mark
Module 31, driving module 32 and detection module 33.Wherein:
Mark module 31 identifies a bright line in advance on LCD to be detected, and this bright line is for having default to LCD applying
The edge of qualified picture shown during the MIPI signal of frequency.
Drive module 32 to be used for LCD and be divided into the multiple regions arranged along preset direction and apply MIPI signal respectively,
Wherein put on the frequency of MIPI signal in each described region along preset direction less than the MIPI putting on its later region
The frequency of signal, and first region is applied the MIPI signal with rated frequency, described rated frequency is to reach dividing of LCD
The frequency of the MIPI signal that resolution is to be applied, rated frequency is less than described predeterminated frequency.
Detection module 33 is for the most qualified according to the picture detection LCD that LCD shows below bright line.Alternatively, detection
Module 33 judges whether LCD shows qualified picture below bright line；If LCD shows qualified picture below bright line, then judge LCD
Qualified；If LCD does not shows qualified picture below bright line, then judge that LCD is defective.
Alternatively, preset direction includes the direction perpendicular with the scan line opening direction of LCD.
Alternatively, the difference of the frequency of the MIPI signal that two regions of arbitrary neighborhood are applied is equal.
Alternatively, each region includes multirow pixel, and the line number of the pixel that regional includes is identical.
The method that the above-mentioned module correspondence of the detection device 30 of the LCD of the present embodiment performs each embodiment above-mentioned, has
Same technique effect.
It should be appreciated that a kind of logic function that is divided into of above-mentioned module divides, actual can have other drawing when realizing
The mode of dividing, such as two modules are desirably integrated in another system, or some features can be ignored, or do not perform.It addition, mould
Block connection each other can pass through some interfaces, it is also possible to is electrical or other form.Above-mentioned module both can use soft
The form of part functional block realizes, it would however also be possible to employ the form of the such as hardware shown in Fig. 4 realizes.
Detection device 30 refering to Fig. 4, described LCD includes at least one processor 41, at least one communication interface 42, deposits
Reservoir 43 and at least one communication bus 44, communication interface 42 is used for processor 41 and calls various data, and memorizer 43 is used for
Storage programmed instruction.For convenience of explanation, processor 41 shown in Fig. 4, communication interface 42, memorizer 43 and communication bus 44
Quantity is one.Wherein, processor 41 is used for:
Execution programmed instruction is to identify a bright line in advance on LCD to be detected, and this bright line is for having default to LCD applying
The edge of qualified picture shown during the MIPI signal of frequency.
Perform programmed instruction with LCD is divided into along preset direction arrangement multiple regions and respectively applying MIPI signal,
Wherein put on the frequency of MIPI signal in each described region along preset direction less than the MIPI putting on its later region
The frequency of signal, and first region is applied the MIPI signal with rated frequency, described rated frequency is to reach dividing of LCD
The frequency of the MIPI signal that resolution is to be applied, rated frequency is less than described predeterminated frequency.
Perform programmed instruction with the most qualified according to the picture detection LCD that LCD shows below bright line.Alternatively, process
Device 41 judges whether LCD shows qualified picture below bright line；If LCD shows qualified picture below bright line, then judge that LCD closes
Lattice；If LCD does not shows qualified picture below bright line, then judge that LCD is defective.
It should be noted that if the above-mentioned functions of the embodiment of the present invention realizes using the form of SFU software functional unit and as
When independent production marketing or use, be storable in a computer read/write memory medium, i.e. the embodiment of the present invention is permissible
Embodying with the form of software product, it includes that some instructions are with so that a computer equipment (can be individual calculus
Machine, server or the network equipment etc.) perform all or part of step of method described in various embodiments of the present invention.
It addition, the foregoing is only embodiments of the invention, not thereby limit the scope of the claims of the present invention, every utilization
Equivalent structure or equivalence flow process that description of the invention and accompanying drawing content are made convert, technical characteristic between the most each embodiment
It is combined with each other, or be directly or indirectly used in other relevant technical fields, be the most in like manner included in the patent protection model of the present invention
In enclosing.
Claims (10)
1. the detection method of a LCD, it is characterised in that described method includes:
Identifying a bright line in advance on LCD to be detected, described bright line is the MIPI letter that described LCD applies to have predeterminated frequency
Number time qualified picture shown by described LCD edge；
Described LCD it is divided into the multiple regions arranged along preset direction and applies MIPI signal respectively, wherein presetting along described
Direction puts on the frequency frequency less than the MIPI signal putting on region described in thereafter of the MIPI signal in each described region
Rate, and first region is applied the MIPI signal with rated frequency, described rated frequency is the resolution reaching described LCD
The frequency of MIPI signal to be applied, described rated frequency is less than described predeterminated frequency；
It is the most qualified that the picture shown according to LCD described below described bright line detects described LCD.
Method the most according to claim 1, it is characterised in that described preset direction includes opening with the scan line of described LCD
Open the direction that direction is perpendicular.
Method the most according to claim 1, it is characterised in that the MIPI signal that two described regions of arbitrary neighborhood are applied
The difference of frequency equal.
Method the most according to claim 1, it is characterised in that each described region includes multirow pixel, each described district
The line number of the pixel that territory includes is identical.
Method the most according to claim 1, it is characterised in that described basis described LCD below described bright line shows
Picture detects the step that described LCD is the most qualified, including:
Judge whether described LCD shows qualified picture below described bright line；If below described bright line described LCD show qualified
Picture, then judge that described LCD is qualified；If described LCD does not shows qualified picture below described bright line, then judge described LCD not
Qualified.
6. the detection device of a LCD, it is characterised in that described device includes:
Mark module, identifies a bright line on LCD to be detected in advance, and described bright line is for having pre-to described LCD applying
If the edge of the qualified picture during MIPI signal of frequency shown by described LCD；
Drive module, for described LCD being divided into the multiple regions arranged along preset direction and applying MIPI signal respectively, its
The frequency of the middle MIPI signal putting on each described region along described preset direction is less than putting on its later region
The frequency of MIPI signal, and first region is applied the MIPI signal with rated frequency, described rated frequency is for reaching
Stating the frequency of the resolution of LCD MIPI signal to be applied, described rated frequency is less than described predeterminated frequency；
Detection module is the most qualified for detecting described LCD according to the picture that described LCD shows below described bright line.
Device the most according to claim 6, it is characterised in that described preset direction includes opening with the scan line of described LCD
Open the direction that direction is perpendicular.
Device the most according to claim 6, it is characterised in that the MIPI signal that two described regions of arbitrary neighborhood are applied
The difference of frequency equal.
Device the most according to claim 6, it is characterised in that each described region includes multirow pixel, each described district
The line number of the pixel that territory includes is identical.
Device the most according to claim 6, it is characterised in that described detection module judges below described bright line described
Whether LCD shows qualified picture；If described LCD shows qualified picture below described bright line, then judge that described LCD is qualified；If
Below described bright line, described LCD does not shows qualified picture, then judge that described LCD is defective.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610544177.7A CN106054418B (en) | 2016-07-11 | 2016-07-11 | LCD detection method and detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610544177.7A CN106054418B (en) | 2016-07-11 | 2016-07-11 | LCD detection method and detection device |
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| CN106054418A true CN106054418A (en) | 2016-10-26 |
| CN106054418B CN106054418B (en) | 2020-05-15 |
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| CN203054102U (en) * | 2012-11-22 | 2013-07-10 | 深圳市视景达科技有限公司 | MIPI-interface LCD screen detection device |
| CN203260298U (en) * | 2013-04-25 | 2013-10-30 | 京东方科技集团股份有限公司 | LCD testing device |
| CN104360511A (en) * | 2014-11-25 | 2015-02-18 | 武汉精测电子技术股份有限公司 | MIPI module test method and test system realizing two modes |
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| WO2013085142A1 (en) * | 2011-12-09 | 2013-06-13 | 주식회사 지엔티시스템즈 | Display module test apparatus having jig mounted with mipi bridge module |
| CN102789073A (en) * | 2012-03-08 | 2012-11-21 | 无锡博一光电科技有限公司 | Testing method for MIPI liquid crystal screen |
| CN102929004A (en) * | 2012-09-26 | 2013-02-13 | 深圳市立德通讯器材有限公司 | Test system for liquid crystal display screen with mobile industry processor interface (MIPI) |
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| CN106054418B (en) | 2020-05-15 |
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Effective date of registration: 20190711 Address after: No. 32, Vanke City, Haicang District, Xiamen City, Fujian Province Applicant after: Lin Zefeng Address before: 518053 H3 501B, east industrial area of overseas Chinese town, Nanshan District, Shenzhen, Guangdong Applicant before: SHENZHEN TINNO WIRELESS TECHNOLOGY Co.,Ltd. |
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Effective date of registration: 20200420 Address after: No. 1041, Jiulong Avenue, Chengxi street, Wenling City, Taizhou City, Zhejiang Province Applicant after: ZHEJIANG HUAMAO PHOTOELECTRIC TECHNOLOGY Co.,Ltd. Address before: No. 32, Vanke City, Haicang District, Xiamen City, Fujian Province Applicant before: Lin Zefeng |
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Denomination of invention: Detection method and device of LCD Effective date of registration: 20210629 Granted publication date: 20200515 Pledgee: Wenling Taiping sub branch of Bank of Taizhou Co.,Ltd. Pledgor: ZHEJIANG HUAMAO PHOTOELECTRIC TECHNOLOGY Co.,Ltd. Registration number: Y2021330000707 |
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Date of cancellation: 20230626 Granted publication date: 20200515 Pledgee: Wenling Taiping sub branch of Bank of Taizhou Co.,Ltd. Pledgor: ZHEJIANG HUAMAO PHOTOELECTRIC TECHNOLOGY Co.,Ltd. Registration number: Y2021330000707 |
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Denomination of invention: LCD detection methods and devices Effective date of registration: 20230705 Granted publication date: 20200515 Pledgee: Wenling Taiping sub branch of Bank of Taizhou Co.,Ltd. Pledgor: ZHEJIANG HUAMAO PHOTOELECTRIC TECHNOLOGY Co.,Ltd. Registration number: Y2023980047397 |