WO2014134880A1 - 背光模组瑕疵的检测方法及设备 - Google Patents
背光模组瑕疵的检测方法及设备 Download PDFInfo
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- WO2014134880A1 WO2014134880A1 PCT/CN2013/076536 CN2013076536W WO2014134880A1 WO 2014134880 A1 WO2014134880 A1 WO 2014134880A1 CN 2013076536 W CN2013076536 W CN 2013076536W WO 2014134880 A1 WO2014134880 A1 WO 2014134880A1
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- Prior art keywords
- backlight module
- image
- component
- detection
- defect
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Classifications
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0004—Industrial image inspection
- G06T7/001—Industrial image inspection using an image reference approach
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/08—Testing mechanical properties
- G01M11/081—Testing mechanical properties by using a contact-less detection method, i.e. with a camera
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8806—Specially adapted optical and illumination features
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0004—Industrial image inspection
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10016—Video; Image sequence
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30108—Industrial image inspection
- G06T2207/30164—Workpiece; Machine component
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/10—Dealing with defective pixels
Definitions
- Embodiments of the present invention relate to the field of flaw detection technology, and in particular, to a method and a device for detecting a backlight module. Background technique
- the conventional detection method is to place the backlight module on the fixture to light up. That is, after the backlight module is lit, it is inspected by manual visual inspection and marked at the ⁇ position, and then the defective product is sent to the repairing unit for repair.
- the existing method of manually detecting the backlight module is low in work efficiency, high in probability of missed detection, and cannot be quantitatively detected in combination with mass production.
- Embodiments of the present invention provide a method and a device for detecting a backlight module, which are used to achieve high efficiency in detecting defects in the interior and appearance of a backlight module.
- a method for detecting a backlight module ⁇ includes: acquiring an image including features of each component in the backlight module at a plurality of preset angles with a surface of the backlight module; An image containing features of each component in the backlight module is analyzed to determine defects existing in components of the backlight module.
- a detection device for a backlight module includes: a machine; The cymbal detecting device of the machine and the loading platform for carrying the backlight module; wherein the cymbal detecting device comprises: acquiring the backlight module in a plurality of preset angles with the surface of the backlight module An image acquiring unit of the image of each component feature; and, in signal connection with the image acquiring unit, analyzing the acquired image containing the features of each component in the backlight module, and determining that each component in the backlight module exists The image analysis unit of the defect.
- FIG. 1 is a schematic diagram of a feature graphic according to an embodiment of the present invention.
- FIG. 2 is a schematic structural diagram of a device for detecting a backlight module according to an embodiment of the present invention
- FIG. 3 is a schematic structural diagram of a first embodiment according to an embodiment of the present invention
- Embodiment 4 is a schematic structural diagram of Embodiment 2 according to an embodiment of the present invention.
- FIG. 5 is a schematic structural diagram of Embodiment 3 according to an embodiment of the present disclosure.
- FIG. 6 is a schematic structural diagram of Embodiment 4 according to an embodiment of the present disclosure.
- FIG. 7 is a schematic structural diagram of an image analysis unit according to an embodiment of the present invention. detailed description
- the method for detecting a backlight module may include the following steps: S101: acquiring an image including features of each component in the backlight module by using a plurality of preset angles with a surface of the backlight module;
- the backlight module is composed of a light guide plate, a diffusion plate, and an optical film layer such as a reflection sheet and a brightness enhancement sheet.
- an image that highlights the features of the components in the backlight module can be obtained.
- an external light source is used to illuminate the surface of the backlight module, the smaller the angle between the shooting direction and the surface of the backlight module, the more the image obtained on the surface of the backlight module can be displayed.
- an image containing features of each component in the backlight module can be obtained by acquiring an image from different preset angles; after analyzing each image, it is possible to determine the existence of each component.
- the method for detecting the backlight module ⁇ provided by the embodiment of the present invention can improve the accuracy of detection and detection relative to the manner of manually detecting the backlight module ⁇ .
- the step S101 in the foregoing method obtaineds an image including the features of each component in the backlight module by using a plurality of preset angles with the surface of the backlight module, and specifically includes the following manners:
- the specific implementation manner may be: when the external light source is irradiated to the backlight module at the first predetermined angle, the second surface is formed with the surface of the backlight module. Set the angle to obtain an image containing the surface features of the backlight module.
- the external light source is white light better than other light sources such as green light.
- the first predetermined angle at which the external light source illuminates the backlight module is 45 degrees.
- the second predetermined angle at which the surface image of the backlight module is obtained is 90 degrees.
- the specific implementation manner may be: when the backlight module is lit, to form a third preset angle with the surface of the backlight module, Obtain an image containing the characteristics of the light guide plate in the backlight module; at this time, the backlight module is not illuminated by an external light source.
- the third predetermined angle for acquiring an image of the light guide plate feature in the backlight module is 90 degrees.
- the specific implementation may be: when the external light source is irradiated to the backlight module at a first preset angle, The surface of the backlight module is at a fourth predetermined angle to obtain an image containing the features of the diffusion plate or the optical film layer in the backlight module.
- the external light source is white light better than other light sources such as green light.
- the first predetermined angle at which the external light source illuminates the backlight module is 45 degrees.
- obtaining a fourth preset angle of an image including a diffuser plate or an optical film layer feature in the backlight module is 60 degrees or
- step S102 analyzes the acquired image including the features of each component in the backlight module, and determines the location of the defect existing in each component of the backlight module. This is achieved by the following steps: 5201. Perform binarization processing on the obtained image containing the features of each component in the backlight module to obtain a corresponding binarized image. Specifically, the binarization process belongs to the prior art, and is not described in detail herein.
- the first average gray value may be calculated by using each adjacent three pixel points in the binarized image as a group, and the adjacent three pixel points may be three adjacent ones in a row.
- the pixel point may also be three adjacent pixel points in a column, which is not limited herein.
- the adjacent three pixel points are adjacent three pixel points in a row, corresponding to calculating a second average gray value of the pixel of the row of the adjacent three pixel points of the group;
- the second average gray value of the pixel of the column in which the adjacent three pixel points are located is calculated.
- contrast variability I first average gray value - second average gray value I / second average gray value.
- step S205 determining whether the contrast variability is greater than the set threshold; when determining that the contrast variability is greater than the set threshold, performing step S205; and determining that the contrast variability is not greater than the set threshold, returning to step S202, to the neighboring N of the other group Pixels are calculated;
- the position of the defect is generally recorded to prepare for subsequent transplanting and repairing.
- the foregoing detection method provided by the embodiment of the present invention may further include the steps of determining and counting the defect type after determining the defect of each component in the backlight module, and the specific steps include: calculating the existence of each component in the backlight module A geometric feature parameter of at least one feature graphic composed of all the defects, and determining a sampling type of the feature graphic according to the calculated geometric feature parameter of each feature graphic.
- a cylindrical PCNN (Pulse Coupled Neural Network) model can be utilized.
- the image of each component that determines the defect is subjected to binary segmentation processing, for example, where each defect in the image is located.
- the pixel value of the pixel at the point is marked as 1, and the pixel value of the other pixel is marked as 0.
- geometric parameters such as area, width, and height of a feature pattern composed of a plurality of consecutive points are calculated. For example, as shown in FIG. 1, the number of pixels having a pixel value of 1 in a feature pattern is counted.
- the number of pixels with a pixel value of 1 between the leftmost end and the rightmost end of the statistical feature graph is the width W; the pixel value of the pixel value between the uppermost end and the lowermost end of the statistical feature graph is 1.
- the number of points is the height 11.
- the geometric feature parameters of each feature graphic can be compared with the features of each category stored in the database to obtain the ⁇ category of the feature graphic.
- the stored data may be modified or added in the database.
- the embodiment of the present invention further provides a detection device for a backlight module.
- the principle of the detection device is similar to the detection method of the backlight module, and the implementation of the detection device can be implemented. See the implementation of the method, and the repetition will not be repeated.
- a detection device for a backlight module includes: a machine 01; a detection device 02 mounted on the machine 01 and a carrier 03 for carrying the backlight module 04 ; among them,
- ⁇ detection device 02 includes:
- the signal acquisition unit 05 is connected to the signal, and the acquired image including the features of each component in the backlight module 04 is analyzed to determine the image analysis unit 06 of the defect existing in each component of the backlight module 04.
- the image acquisition unit 05 can be at a preset angle of 90 degrees, 60 degrees, and 30 degrees with the surface of the backlight module 04 to obtain an image including features of the components in the backlight module 04.
- the backlight module 04 is composed of a light guide plate, a diffusion plate, and an optical film layer such as a reflection sheet and a brightness enhancement sheet.
- the image obtaining unit 05 may obtain an angle of 90 degrees from the surface of the backlight module when the external light source illuminates the backlight module 04 at the first predetermined angle.
- An image containing the surface features of the backlight module when implemented, external The light source is white light better than other light sources such as green light.
- the first predetermined angle at which the external light source illuminates the backlight module is 45 degrees.
- the image obtaining unit 05 can obtain the backlight module at a 90 degree angle with the surface of the backlight module when the backlight module 04 is lit.
- the image acquisition unit 05 may be configured to illuminate the backlight module with the external light source at a first predetermined angle. At an angle of 30 degrees or 60 degrees, an image containing the features of the diffuser or optical film layer in the backlight module 04 is obtained.
- the flaw detecting device in the above detecting device provided by the embodiment of the present invention can be implemented in the following manners.
- Example 1 As shown in FIG. 3, the if ⁇ detecting device 02 may have a detecting station; the image obtaining unit includes: a CCD device 07 located at the detecting station;
- the detecting station has an external light source 08 for illuminating the backlight module 04; the external light source 08 generally illuminates the surface of the backlight module 04 at a 45 degree angle;
- the stage 03 is a stage that can be flipped along an axis parallel to the surface of the stage 03. Thus, when the images of the components of the backlight module 03 are acquired at different preset angles, the stage 03 and the backlight module can be rotated. 04. Adjust the relative angle between the shooting direction of the CCD device 07 and the surface of the backlight module 04.
- Example 2 As shown in FIG. 4, the flaw detection device 02 has a detection station;
- the inspection station has an external light source 08 for illuminating the backlight module 04; the external light source 08 generally illuminates the surface of the backlight module 04 at a 45 degree angle.
- the image acquisition unit includes: a CCD device 07 located at the detecting station; the angle between the image capturing direction of the CCD device 07 and the surface of the backlight module 04 can be adjusted, so that the components of the backlight module 04 are acquired at different preset angles.
- the relative position between the CCD device 07 and the backlight module 04 can be adjusted by rotating the CCD device 07.
- Example 3 As shown in FIG. 5, the flaw detection device 02 has a detection station
- the inspection station has an external light source 08 for illuminating the backlight module 04; the external light source 08 generally illuminates the surface of the backlight module 04 at a 45 degree angle.
- the image acquisition unit comprises: a plurality of CCD devices 07 located at the detection station, each CCD device The angle between the image capturing direction of the 07 and the surface of the backlight module 04 is different. In this way, each CCD device 07 can simultaneously acquire images of various components of the backlight module 04 through different preset angles.
- Example 4 As shown in Fig. 6, the stage 03 is mounted on the machine table 01 by a conveying device; the ⁇ detecting device has a plurality of detecting stations located on the conveying device stroke;
- At least one inspection station has an external light source 08 for illuminating the backlight module 04; the external light source 08 illuminates the surface of the backlight module 04 at a 45 degree angle.
- the image acquisition unit includes at least one CCD device 07 each of the inspection stations, and the angle between the image capturing direction of each CCD device 07 and the surface of the backlight module 04 is at least two angles.
- a CCD device 07 may be disposed in a detection station, and a plurality of CCD devices 07 may be disposed, which is not limited herein.
- the angles of the acquired images of the CCD devices 07 may be different or partially identical, and are not limited herein.
- the implementation of multiple CCD devices can realize non-stop detection and improve detection efficiency.
- the CCD device 07 mentioned in the first embodiment, the second embodiment, the third embodiment, and the fourth embodiment may be a line CCD device or a surface array CCD device, which is not limited herein.
- the image analyzing unit 06 in the above-mentioned detecting device provided by the embodiment of the present invention, as shown in FIG. 7, may specifically include:
- the binarization processing sub-unit 061 is connected to the image acquisition unit 05 for performing binarization processing on the acquired images containing the features of the components in the backlight module to obtain corresponding binarized images;
- the gray value calculation subunit 062 is connected to the binarization processing subunit 061, and is configured to determine, for each set of adjacent N pixel points in each binarized image, the set of adjacent N pixel points. a first average gray value, and a second average gray value of a pixel of the row or column in which the adjacent N pixel points are located;
- a contrast variability subunit 063 coupled to the gray value calculation subunit 062, for determining a contrast variability of the first average gray value and the second average gray value;
- the judging subunit 064 is connected to the contrast variability subunit 063, and is configured to determine, after the contrast variability subunit, that the contrast variability is greater than a set threshold, determine the neighboring N pixel points as the refreshing point. .
- the image analyzing unit 06 in the above detecting apparatus provided by the embodiment of the present invention, As shown in FIG. 7, it may further include:
- the geometric characteristic parameter calculation subunit 065 is connected to the ⁇ determination subunit 064 signal, and is used for calculating geometric characteristic parameters of at least one characteristic pattern composed of all defects existing in each component of the backlight module;
- the ⁇ classification sub-unit 066 is connected to the geometric feature parameter calculation sub-unit 065 signal for determining the ⁇ category of the feature graphic according to the geometric feature parameter of each feature graphic.
- the embodiments of the present invention can be implemented by hardware, and can also be implemented by means of software and a necessary general hardware platform.
- the technical solution of the embodiment of the present invention may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a USB flash drive, a mobile hard disk, etc.).
- a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention.
- modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment according to the embodiment, or may be correspondingly changed in one or more apparatuses different from the embodiment.
- the modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.
- the method for detecting a backlight module ⁇ provides a plurality of preset angles with a surface of the backlight module to obtain an image containing features of each component in the backlight module;
- the images of the features of the various components are analyzed to determine the defects of the components in the backlight module.
- an image containing the features of each component in the backlight module can be obtained.
- the defects of each component can be determined, and the backlight module is realized. Internal and appearance flaws are detected.
- the method for detecting the backlight module ⁇ provided by the embodiment of the present invention can improve the detection efficiency and the accuracy of detection compared to the manner of manually detecting the backlight module ⁇ .
- a detecting device for a backlight module ⁇ includes a cymbal detecting device mounted on the machine and a loading platform for carrying the backlight module; wherein the cymbal detecting device comprises: a surface of the backlight module A map of images containing features of various components in the backlight module obtained at a plurality of preset angles
- the image acquisition unit is configured to analyze the acquired image containing the features of each component in the backlight module, and determine an image analysis unit of the defect existing in each component of the backlight module. Since the image acquisition unit adopts the method of acquiring images from different preset angles, an image containing the features of each component in the backlight module can be obtained, and after the image analysis unit analyzes each image, the defects of each component can be determined.
- the detection device of the backlight module ⁇ provided by the embodiment of the invention can improve the detection efficiency and the detection accuracy rate relative to the manner of manually detecting the backlight module ⁇ .
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US14/346,868 US9330451B2 (en) | 2013-03-06 | 2013-05-31 | Method and apparatus for detecting defect of backlight module |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310071403.0 | 2013-03-06 | ||
| CN201310071403.0A CN103217436B (zh) | 2013-03-06 | 2013-03-06 | 一种背光模组瑕疵的检测方法及设备 |
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| WO2014134880A1 true WO2014134880A1 (zh) | 2014-09-12 |
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| PCT/CN2013/076536 Ceased WO2014134880A1 (zh) | 2013-03-06 | 2013-05-31 | 背光模组瑕疵的检测方法及设备 |
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| Country | Link |
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| US (1) | US9330451B2 (zh) |
| CN (1) | CN103217436B (zh) |
| WO (1) | WO2014134880A1 (zh) |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN103217436A (zh) | 2013-07-24 |
| US9330451B2 (en) | 2016-05-03 |
| CN103217436B (zh) | 2015-05-20 |
| US20150063675A1 (en) | 2015-03-05 |
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