KR101974111B1 - Method and System for Testing Display Panel - Google Patents

Abstract

A method of inspecting a display panel according to an aspect of the present invention that detects a panel area on a photographed image photographed by a camera and corrects distortion of the detected panel area includes the steps of binarizing a photographed image of the display panel ; Detecting a panel region using a vertical line and a horizontal line having a ratio of white of the binarized photographed image to a reference value or higher; Calculating a boundary line of a straight line for correcting the detected panel area; And correcting the panel area so that the entire panel area inside the boundary line becomes white.

Description

TECHNICAL FIELD [0001] The present invention relates to a display panel,

The present invention relates to a method of inspecting a display panel used in a display device and an inspection system of the display panel.

A display device such as a liquid crystal display (LCD), an organic light emitting diode (OLED), a plasma display panel (PDP), an electrophoretic display (EPD) It is manufactured through various processes. This manufacturing process includes an inspection process for checking whether the display panel used in the display device is operating normally.

A display panel inspection apparatus for performing such inspection process is disclosed in Korean Patent Registration No. 10-0768122.

In the case of the conventional display panel inspection apparatus including Korean Patent No. 10-0768122, the panel image is obtained by photographing the display panel using a camera, and the defectiveness of the display panel is checked using the obtained panel image It was common.

However, in the case of a camera that photographs a display panel, since a lens included in the camera has a feature of distorting the subject, distortion of the image captured by the camera can not be avoided. For example, in the case of the panel area 100 included in the normal photographed image of the display panel, in the case of the panel area 100 included in the distorted photographed image, As shown in FIG.

For this reason, the conventional display panel inspection apparatus has a problem that it can not accurately detect whether the display panel is defective or not.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a display panel inspection method and an inspection system capable of detecting a panel area in an image photographed by a camera and correcting distortion of the detected panel area, We will do it.

According to an aspect of the present invention, there is provided a method of inspecting a display panel, the method comprising: binarizing a photographed image of a display panel; Detecting a panel region using a vertical line and a horizontal line having a ratio of white of the binarized photographed image to a reference value or higher; Calculating a boundary line of a straight line for correcting the detected panel area; And correcting the panel area so that the entire panel area inside the boundary line becomes white.

According to another aspect of the present invention, there is provided an inspection system for a display panel, including: an image capturing device for capturing a captured image by capturing a display panel; And an image correction device for correcting distortion of the photographed image, wherein the image correction device comprises: a preprocessor for binarizing the photographed image; A panel region detecting unit for detecting a panel region using a vertical line and a horizontal line having a ratio of white of the binarized photographed image to a reference value or higher; A boundary line calculating unit for calculating a boundary line of a straight line for correcting the detected panel area; And a correction unit for correcting the panel area so that the entire panel area inside the boundary line of the straight line becomes white.

According to the present invention, the panel area is detected in the photographed image taken by the camera, and the distortion of the panel area is corrected by resizing of the sub areas included in the detected panel area, thereby accurately restoring the shape of the panel area It is possible to improve the accuracy of detection of defective display panel.

1A is a view showing an undistorted photographed image
1B is a view showing a distorted photographed image.
2 is a schematic view illustrating a configuration of a display panel inspection system according to an embodiment of the present invention.
3 is a block diagram schematically showing the configuration of the image correction apparatus shown in FIG.
4A is a diagram showing an example of a photographed image before binarization;
4B is a view showing an example of a photographed image binarized by the preprocessing unit;
5A is a diagram illustrating a method of detecting a lateral region of a panel region;
FIG. 5B shows a method for detecting a vertical region of a panel region; FIG.
6A is an exemplary view showing first to fourth representative points;
FIG. 6B is an exemplary view showing first to fourth quadratic function curves; FIG.
FIG. 6C is an exemplary view showing first and second horizontal boundary lines and first and second vertical boundary lines in the form of a straight line; FIG.
FIGS. 7A to 7C illustrate a method of correcting a panel area for each vertical line. FIG.
8A to 8C illustrate a method of calibrating a panel area for each horizontal line.
9 is an exemplary view showing a photographed image including a corrected panel region;
10 is a flowchart illustrating a method of testing a display panel according to an embodiment of the present invention.
11 is a flowchart showing a method of calculating first and second horizontal boundary lines and first and second vertical boundary lines in a linear form;

The meaning of the terms described herein should be understood as follows.

The word " first, " " second, " and the like, used to distinguish one element from another, are to be understood to include plural representations unless the context clearly dictates otherwise. The scope of the right should not be limited by these terms.

It should be understood that the terms "comprises" or "having" does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

It should be understood that the term " at least one " includes all possible combinations from one or more related items. For example, the meaning of " at least one of the first item, the second item and the third item " means not only the first item, the second item or the third item, but also the second item and the second item among the first item, Means any combination of items that can be presented from more than one.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Display panel inspection system

FIG. 2 is a schematic view illustrating a configuration of a display panel inspection system according to an embodiment of the present invention. Referring to FIG.

The display panel inspection system 1 according to an embodiment of the present invention shown in FIG. 2 is for performing an inspection process on the display panel 10. FIG. The display panel 10 may include a liquid crystal display (LCD), an organic light emitting diode (OLED), a plasma display panel (PDP), an electrophoretic display (EPD) ) And the like.

A display panel inspection system (1) according to the present invention obtains an image for inspection of a display panel (10). The display panel inspection system 1 according to the present invention can be connected to a detection device (not shown) for detecting whether or not the display panel 10 is defective. When the display panel inspection system 1 according to the present invention provides the obtained image to the detection device, the detection device can detect whether or not the display panel 10 is defective using the obtained image.

For example, the detecting device can detect whether or not the display panel 10 is defective by comparing the reference image for the normally operated display panel with the obtained image. The detecting device may detect whether the display panel 10 is defective by comparing the obtained images with each other to detect a difference in brightness or the like.

Meanwhile, the display panel inspection system 1 according to the present invention may be implemented as a separate apparatus from the detection apparatus, or may include a configuration having the function of the detection apparatus.

2, the display panel inspection system 1 according to the present invention includes a support 20 for supporting the display panel 10, an image acquisition unit 20 for acquiring an image for inspection of the display panel 10, An acquiring device 25 and an image correcting device 30 for correcting the distortion of the photographed image acquired by the image acquiring device 25. [

The support portion 20 supports the display panel 10. The display panel 10 is moved to a position where the image capturing device 25 can photograph the display panel 10 while being supported by the support portion 20. [

In one embodiment, the display panel inspection system 1 according to the present invention includes devices for performing an assembly process, an inspection process, a visual inspection process, a packaging process, and the like of a display device including the display panel 10, The support part 20 may be installed on a conveyor C for conveying the display panel 10. [

The support portion 20 may support the display panel 10 such that the display panel 10 is positioned in a state of being vertically or vertically close to the display panel 10. Although not shown, the supporting part 20 may be formed with an insertion groove into which the display panel 10 is inserted. The display panel 10 is inserted into the insertion groove and is supported by the support portion 20 so that the image acquisition device 25 is moved to a position where the display panel 10 can be photographed in a state of being close to a vertical state or a vertical state .

The support portion 20 may be formed in a shape that can support the display panel 10 without blocking the image display portion 11 on which the image is displayed in the display panel 10. [

The image acquiring device 25 acquires an image captured by the display panel 10. In one embodiment, the image acquiring device 25 may be a vision camera for photographing the display panel 10. [ In such a case, such a vision camera may include an area camera for photographing the entire image displayed through the display panel 10, or a line camera (line camera) for photographing the image displayed through the display panel 10, Scan Camera). When the image acquisition device 25 is a line scan camera, the image acquisition device 25 synthesizes images photographed for each vertical line to acquire the entire photographed image.

Although not shown, the display panel inspection system 1 according to the present invention adjusts the position of the image capturing device 25 so that the image capturing device 25 is in a state of being vertically or vertically close to the display panel 10 And a position adjustment unit that allows the position adjustment unit to be maintained. The position adjusting unit rotates the image capturing device 25 or moves the image capturing device 25 up and down so that the image capturing device 25 and the display panel 10 are kept in a state of being close to a vertical state or a vertical state.

Next, the image correcting device 30 receives the photographed image from the image acquiring device 25, corrects the distortion of the received photographed image, and detects whether the display panel 10 is defective or not from the photographed image more accurately . Specifically, the image correcting device 30 detects the panel area from the received photographed image and corrects the detected panel area to correct the distortion of the photographed image.

Hereinafter, the configuration of the image correction device 30 will be described in more detail with reference to FIG. 3 is a block diagram schematically illustrating the configuration of an image correction apparatus according to an embodiment of the present invention.

3, the image correcting apparatus 30 according to the embodiment of the present invention includes a preprocessing unit 32, a panel region detecting unit 34, a boundary line calculating unit 36, and a correcting unit 38 .

First, the preprocessing unit 32 prepares the photographed image by binarizing the received photographed image. Here, the binarization means that all the pixels of the image are represented only in black and white. This binarization of the image is performed by setting a pixel having a low value based on a specific threshold value to black, and setting a pixel having a high value to white.

For example, the preprocessing unit 32 converts the photographed image as shown in FIG. 4A into an image composed of black and white as shown in FIG. 4B by binarizing the photographed image.

Referring again to FIG. 3, the panel region detecting unit 34 detects the panel region from the photographed image binarized by the preprocessing unit 32. [0034] FIG.

In one embodiment, the panel area detector 34 scans the binarized photographic image for each of the vertical and horizontal lines, and uses the vertical and horizontal lines with a ratio of white (e.g., white) .

5A, the panel region detecting unit 34 sequentially scans all the vertical lines constituting the binarized photographed image, and determines whether the ratio of white included in each vertical line is equal to or greater than a reference value (for example, 80%) Vertical lines are determined as vertical lines to be included in the horizontal area of the panel area.

5B, the panel region detecting unit 34 sequentially scans all the horizontal lines constituting the binarized photographed image, and determines whether the ratio of white included in each horizontal line is equal to or greater than a reference value (for example, 80%) The horizontal lines are determined as horizontal lines to be included in the vertical area of the panel area.

Then, the panel area detecting unit 34 detects an area including the determined vertical lines and horizontal lines as the panel area.

Referring back to FIG. 3, the boundary line calculating unit 36 calculates a straight line boundary line that forms the boundary of the panel area for correcting the panel area detected by the panel area detecting unit 34. [0043] FIG. That is, the boundary line calculating unit 36 calculates a boundary line between the first horizontal direction boundary and the second horizontal direction boundary to constitute the two long sides of the panel region, the first vertical direction boundary to constitute the two short sides of the panel region, The vertical direction boundary line is calculated.

Hereinafter, a method of calculating the first and second horizontal-direction boundary lines and the first and second vertical direction boundary lines will be described in more detail with reference to the examples shown in Figs. 6A to 6C.

First, as shown in FIG. 6A, the boundary line calculating unit calculates the first white pixel included in the panel area in each vertical line constituting the panel area to calculate the first horizontal boundary line as a first representative point 610) and extracts the last white pixel included in the panel area as a second representative point 64 in each vertical line constituting the panel area to calculate the second horizontal boundary line.

In order to calculate the first vertical boundary line, the boundary line calculating unit 620 extracts, as the third representative point 630, the first white pixel included in the panel area in each horizontal line constituting the panel area And extracts the last white pixel included in the panel area as a fourth representative point 640 in each horizontal line constituting the panel area to calculate the second vertical direction boundary line.

6B, the boundary line calculating unit 36 calculates a first multidimensional function curve 612 from a plurality of first representative points 610 using a regression analysis technique, A second multidimensional function curve 622 is calculated from the plurality of second representative points 620 and a third multidimensional function curve 632 is calculated from the plurality of third representative points 630, A fourth multidimensional function curve 642 is calculated from the representative points 640. [

6C, the boundary line calculating unit 36 calculates a first horizontal boundary line 614 of a straight line shape using the two average values of the first multi-dimensional function curve 612, A second horizontal boundary line 624 of a straight line shape is calculated using two average values of the function curves 622 and a second horizontal direction boundary line 624 is calculated by using the two average values of the third plural differential function curves 632, And calculates the fourth horizontal direction boundary line 644 in the form of a straight line by using the two average values of the fourth quadratic function curve 642. [

In the above description, the boundary line calculating unit 36 calculates the multidimensional curves from the respective representative points and calculates the boundary lines using the two average values of the multidimensional curves. However, For example, based on the linear regression analysis technique, a straight line having the closest distance from each representative point may be respectively extracted for each of the first to fourth representative points according to the least squares method, and the extracted four straight lines may be set as a boundary line .

Referring again to FIG. 3, the correcting unit 38 determines that the first and second horizontal boundary lines calculated by the boundary line calculating unit 36 and the panel regions included in the first and second vertical boundary lines are white Thereby correcting the panel area.

The reason for correcting the panel area in the photographed image through the correcting unit 38 in the present invention is that the panel area included in the four boundary lines calculated by the boundary line calculating unit 36, 654, and 656 are included in the panel region included in the four boundary lines 614, 624, 634, and 644, as shown in Fig. 6C due to distortion, This is because, although not shown, a white region to be included in the panel region may exist outside the four boundary lines 614, 624, 634, and 644.

First, the correcting unit 38 scans the vertical lines constituting the panel area, and determines whether the length of the white area included in the vertical line of each vertical line is equal to the length between the first and second horizontal directional boundaries The length of the white region is increased or decreased vertically so that the length of the white region with respect to the vertical line becomes equal to the length between the first and second lateral direction boundaries.

For example, as shown in FIG. 7A, the correcting unit 38 scans the vertical lines constituting the panel area, and then, as shown in FIG. 7B, the white area A The length d1 of the white region A is greater than the length d1 of the white region A relative to the vertical line in which the length d1 of the white region A is not equal to the length d2 between the first and second lateral boundary lines 614, The length of the white region A is vertically extended so as to be equal to the length d2 between the horizontal directional lines 614 and 624 to correct the distortion of the panel region as shown in Fig.

Since the length d1 of the white region A is shorter than the length d2 between the first and second lateral boundary lines 614 and 624 in the example shown in Fig. When the length d1 of the white region A is longer than the length d2 between the first and second transverse boundary lines 614 and 624, the correcting unit 38 May reduce the length d1 of the white region A as well.

Next, the correcting unit 38 scans each of the horizontal lines constituting the panel area, and determines whether the length of the white area included in the horizontal line among the horizontal lines is equal to the length between the first and second vertical direction boundaries The length of the white region is enlarged or reduced to the left or right so that the length of the white region is equal to the length between the first and second longitudinal boundary lines with respect to the non-horizontal line.

For example, as shown in FIG. 8A, the correcting unit 38 scans the horizontal lines constituting the panel area, and then, as shown in FIG. 8B, the white area A The length d1 of the white region A is less than the length d2 between the first and second longitudinal boundary lines 634 and 644 for a horizontal line in which the length d1 of the white region A is not equal to the length d2 between the first and second longitudinal boundary lines 634 and 644. [ The length of the white region A is extended to the left and right so as to be equal to the length d2 between the two vertical direction boundary lines 634 and 644 to correct the distortion of the panel region as shown in Fig.

8C, since the length d1 of the white region A is shorter than the length d2 between the first and second vertical direction boundary lines 634 and 644, the correcting unit 38 is arranged in the white region A When the length d1 of the white region A is longer than the length d2 between the first and second longitudinal boundary lines 644 and 644, May reduce the length d1 of the white region A as well.

According to the above-described method, when the distortion is corrected, as shown in FIG. 9, the panel area in the photographed image is defined by four straight line boundaries, and the four straight line boundaries are made white.

How to inspect the display panel

Hereinafter, a method of inspecting a display panel according to the present invention will be described in more detail with reference to FIG.

10 is a flowchart illustrating a method of testing a display panel according to an embodiment of the present invention. The inspection method of the display panel shown in FIG. 10 can be performed by the display panel inspection system shown in FIG.

First, the display panel inspection system acquires a photographed image of an image output through the display panel (S1000). In one embodiment, the display panel inspection system may capture an image output through the display panel using a vision camera. In this case, the vision camera may be an area camera that captures an entire image displayed through the display panel, or a line scan camera that captures an image output through the display panel by each vertical line. When acquiring an image through a line scan camera, the display panel inspection system synthesizes the images taken for each vertical line to acquire the entire captured image.

Next, the display panel inspection system binarizes the photographed image (S1010). Here, the binarization means that all the pixels of the image are represented only in black and white. This binarization of the image is performed by setting a pixel having a lower value based on a specific boundary value to black, and setting a pixel having a higher value to white.

Next, the display panel inspection system detects the panel area from the binarized photographed image (S1020).

In one embodiment, the display panel inspection system may scan the binarized photographic image for each of the vertical and horizontal lines, and detect the panel area using a vertical line and a horizontal line with a ratio of white to a reference value or higher.

That is, as shown in FIG. 5A, the display panel inspection system sequentially scans all the vertical lines constituting the binarized photographic image, and determines whether the ratio of white included in each vertical line is equal to or greater than a reference value (for example, 80% The vertical lines are determined as vertical lines to be included in the panel area, and all the horizontal lines constituting the binarized photographic image are sequentially scanned, as shown in FIG. 5B, so that the ratio of white included in each horizontal line becomes a reference value , 80%) horizontal lines can be determined as horizontal lines to be included in the panel area.

The display panel inspection system detects an area including the determined vertical lines and horizontal lines as the panel area.

Next, the display panel inspection system calculates a straight line shape boundary forming the boundary of the panel area for correcting the panel area detected in step S1020 (S1030). That is, the display panel inspection system includes a first horizontal boundary line and a second horizontal boundary line that will form two long sides of the panel area, a first vertical boundary line that will form two short sides of the panel area, The boundary line is calculated.

Hereinafter, a method by which the display panel inspection system calculates the first and second horizontal-direction boundary lines and the first and second vertical direction boundary lines will be described in more detail with reference to FIG.

Figure 11 is a flow chart illustrating a method for calculating first and second horizontal-to-white boundaries and first and second vertical boundaries according to an embodiment of the present invention.

First, the display panel inspection system extracts first and second representative points for each vertical line constituting the panel area, and extracts third and fourth representative points for each horizontal line (S1100).

Specifically, the display panel inspection system extracts a first white pixel included in the panel area in each vertical line constituting the panel area as a first representative point, and extracts, in each vertical line constituting the panel area, And extracts the last white pixel included in the second representative point.

In addition, the display panel inspection system extracts a first white pixel included in the panel area in each horizontal line constituting the panel area as a third representative point, And extracts the last white pixel included in the fourth representative point.

Thereafter, the display panel inspection system calculates a multidimensional function curve from each representative point using a regression analysis technique (S1110).

Specifically, the display panel inspection system includes: a first calculation unit for calculating a first multi-dimensional function curve from a plurality of first representative points, a second multi-dimensional function curve from a plurality of second representative points, And a fourth multidimensional function curve is calculated from the plurality of fourth representative points. A method of calculating a multidimensional function curve from a plurality of points using a regression analysis technique is a well-known technique, and a detailed description thereof will be omitted.

Then, the display panel inspection system calculates the first and second longitudinal boundary lines in a linear form and the first and second longitudinal boundary lines in a linear form by using two average values of the calculated multi-dimensional functional curves (S1120) .

Specifically, the display panel inspection system calculates a first horizontal boundary line by using the two average values of the first multi-dimensional function curves, and calculates a second horizontal direction boundary by using the two average values of the second multi- A third horizontal direction boundary line is calculated by using the two average values of the third multidimensional function curves, and the fourth horizontal direction boundary line is calculated by using the average of two values of the fourth multi- .

In the above description, the display panel inspection system calculates the multidimensional curves from the respective representative points and calculates the respective boundary lines using the two average values of the multidimensional curves. However, this is only one example, A straight line having the closest distance from each representative point may be respectively extracted for each of the first to fourth representative points according to the least squares method on the basis of the regression analysis technique and the extracted four straight lines may be set as a boundary line.

Referring again to FIG. 10, in the display panel inspection system, the first and second horizontal boundary lines of the linear shape calculated at S1030 and the panel regions included in the first and second vertical boundary lines of the linear shape are white Area is corrected (S1040).

Specifically, the display panel inspection system scans each of the vertical lines constituting the panel area, and determines that the length of the white area included in the vertical line of each vertical line is not equal to the length between the first and second horizontal direction boundaries The length of the white region is vertically enlarged or reduced so that the length of the white region with respect to the vertical line becomes equal to the length between the first and second lateral boundary lines.

The display panel inspection system scans each of the horizontal lines constituting the panel area and scans the horizontal line of the panel area so that the length of the white area included in the horizontal line among the horizontal lines is not equal to the length between the first and second longitudinal direction boundaries The length of the white region is enlarged or reduced to the left or right so that the length of the white region with respect to the line becomes equal to the length between the first and second longitudinal boundary lines.

The display panel inspection system corrects the distortion of the photographed image by correcting the panel area as described above.

Thereafter, although not shown, the display panel inspection system transmits the photographed image corrected with the distortion to the detecting device, so that the detecting device can detect whether the display panel is defective by using the photographed image whose distortion is corrected.

The above-described method for inspecting the display panel may be implemented in the form of a program command that can be executed through various computer means and recorded on a computer-readable recording medium. At this time, the computer-readable recording medium may include program commands, data files, data structures, and the like, alone or in combination. On the other hand, the program instructions recorded on the recording medium may be those specially designed and configured for the present invention or may be available to those skilled in the art of computer software.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

1: Display panel inspection system 10: Display panel
20: Support part 25: Image acquisition device
30: image correcting device 32: preprocessing section
34: panel area detecting unit 36: boundary line calculating unit
38:

Claims (10)

Binarizing a photographed image of the display panel;
Detecting a panel region using a vertical line and a horizontal line having a ratio of white of the binarized photographed image to a reference value or higher;
Calculating a boundary line of a straight line for correcting the detected panel area; And
And correcting the panel area so that the entire panel area inside the boundary becomes white,
The boundary line of the straight line includes a horizontal boundary line constituting a long side of the panel area and a vertical direction boundary line constituting a short side of the panel area,
The horizontal boundary line is calculated from a representative point determined for each vertical line using a regression analysis technique,
Wherein the vertical boundary line is calculated from a representative point determined for each horizontal line using a regression analysis technique,
The representative point determined for each vertical line is the first or last white pixel included in the panel area for each vertical line, and the representative point determined for each horizontal line is the first or last white pixel included in the panel area for each horizontal line. A method of inspecting a display panel which is a white pixel. delete The method according to claim 1,
The step of calculating the boundary line of the straight line includes:
Extracting a first white pixel included in the panel region for each vertical line as a first representative point and extracting a last white pixel as a second representative point; And
Calculating a first horizontal boundary line using the first representative points extracted for each of the vertical lines and calculating a second horizontal boundary line using the second representative points extracted for each vertical line, Inspection method of panel. The method according to claim 1,
The step of calculating the boundary line of the straight line includes:
Extracting a first white pixel included in the panel region for each horizontal line as a third representative point and extracting a last white pixel as a fourth representative point; And
Setting a first vertical boundary line using the third representative points extracted for each horizontal line and calculating a second vertical boundary line using the fourth representative points extracted for each horizontal line, Inspection method of panel. The method according to claim 1,
Wherein the correcting comprises:
Wherein a white color region of each vertical line constituting the panel region has a length equal to a length between a first horizontal boundary line and a second horizontal boundary line constituting two long sides of the panel region, Expanding or reducing the area; And
The length of the white region included in each horizontal line for each horizontal line constituting the panel region is equal to the length between the first vertical boundary line constituting the two short sides of the panel region and the second vertical boundary line, And enlarging or reducing the area of the display panel. A computer-readable recording medium for carrying out the method for inspecting a display panel according to any one of claims 1, 3, 4 and 5. An image capturing device for capturing a captured image by capturing a display panel; And
And an image correcting device for correcting distortion of the photographed image,
Wherein the image correction device comprises:
A preprocessing unit for binarizing the photographed image;
A panel region detecting unit for detecting a panel region using a vertical line and a horizontal line having a ratio of white of the binarized photographed image to a reference value or higher;
A boundary line calculating unit for calculating a boundary line of a straight line for correcting the detected panel area; And
And a correction unit for correcting the panel area so that the entire panel area inside the boundary of the straight line becomes white,
The boundary line of the straight line includes a horizontal boundary line constituting a long side of the panel area and a vertical direction boundary line constituting a short side of the panel area,
Wherein the boundary calculation unit calculates the horizontal boundary line from the representative points determined for each vertical line using a regression analysis technique and calculates the vertical boundary line from the representative points determined for each horizontal line,
The representative point determined for each vertical line is the first or last white pixel included in the panel area for each vertical line, and the representative point determined for each horizontal line is the first or last white pixel included in the panel area for each horizontal line. An inspection system of a display panel which is a white pixel. delete 8. The method of claim 7,
The boundary-
Extracting first white pixels included in the panel region for each vertical line as first representative points, calculating a first horizontal boundary line using the first representative points,
Extracting the last white pixels included in the panel region as second representative points for each vertical line, calculating a second horizontal boundary line using the second representative points,
Extracting first white pixels included in the panel region for each horizontal line as third representative points, calculating a first vertical boundary line using the third representative points,
Extracting last white pixels included in the panel region for each of the horizontal lines as fourth representative points, and calculating a second vertical boundary line using the fourth representative points. 8. The method of claim 7,
Wherein,
Wherein a white color region of each vertical line constituting the panel region has a length equal to a length between a first horizontal boundary line and a second horizontal boundary line constituting two long sides of the panel region, Expand or collapse the area,
The length of the white region included in each horizontal line for each horizontal line constituting the panel region is equal to the length between the first vertical boundary line constituting the two short sides of the panel region and the second vertical boundary line, An inspection system of a display panel that enlarges or reduces an area.

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