CN110243336B - Screen body warping detection method - Google Patents
Screen body warping detection method Download PDFInfo
- Publication number
- CN110243336B CN110243336B CN201910695761.6A CN201910695761A CN110243336B CN 110243336 B CN110243336 B CN 110243336B CN 201910695761 A CN201910695761 A CN 201910695761A CN 110243336 B CN110243336 B CN 110243336B
- Authority
- CN
- China
- Prior art keywords
- screen body
- points
- warping
- edge
- deformation caused
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Image Processing (AREA)
- Image Analysis (AREA)
Abstract
The invention provides a screen body warping detection method which is characterized by comprising the following steps: judging whether the edge of the screen body has deformation caused by screen body warping; judging whether the corners of the screen body have deformation caused by screen body warping; and judging that the screen body is warped when at least one edge of the screen body has deformation caused by warping of the screen body or at least one corner of the screen body has deformation caused by warping of the screen body. Therefore, the screen body can be accurately judged to be in the warping state, the misjudgment of the warping of the screen body as the defect of the screen body is avoided, the misjudgment rate is effectively reduced, and the material waste caused by misjudgment of a good product as a defective product is reduced.
Description
Technical Field
The invention relates to the technical field of display, in particular to a screen body warpage detection method.
Background
In a screen test (cell test) process segment in the manufacturing process of an FPD (Flat Display Panel), because a glass substrate of a screen is warped or the screen is not completely absorbed on an adsorption platform, the screen is in a warped state, and the warped state of the screen is misjudged as a defect of the screen, so that the screen is misjudged as a defective product.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method for detecting a screen warpage, so as to solve the problem in the prior art that a screen warpage is erroneously determined as a screen defect during a screen defect detection.
An embodiment of the present invention provides a method for detecting a warpage of a screen body, including: judging whether the edge of the screen body has deformation caused by screen body warping; judging whether the corners of the screen body have deformation caused by screen body warping; and judging that the screen body is warped when at least one edge of the screen body has deformation caused by warping of the screen body or at least one corner of the screen body has deformation caused by warping of the screen body. Therefore, the screen body can be accurately judged to be in a warping state, the screen body warping is prevented from being misjudged as a screen body defect, manual reinspection resources are saved, material waste is avoided, misjudgment rate is effectively reduced, and material waste caused by misjudgment of good products as defective products is reduced.
In one embodiment, the determining whether the edge of the screen body has deformation caused by screen body warping includes: continuously selecting at least three points on the edge of the display area of the screen body; calculating to obtain a first slope according to a first group of continuous two points in the at least three points; calculating to obtain a second slope according to a second group of continuous two points in the at least three points; calculating an absolute value of a difference between the first slope and the second slope; and when the absolute value of the difference value between the first slope and the second slope is larger than a first threshold and smaller than a second threshold, judging that the edge of the screen body has deformation caused by screen body warping. By the method, whether the edge of the screen body deforms due to the warping of the screen body can be judged simply and quickly.
In one embodiment, the distance between the first set of consecutive two points is the same as the distance between the second set of consecutive two points; the distance between one point of the second group of continuous two points close to the first group of continuous two points and one point of the first group of continuous two points close to the second group of continuous two points is a fixed length. The accuracy of judging whether the edge of the screen body has deformation caused by the warping of the screen body is further improved.
In one embodiment, the first set of two consecutive dots has a common dot with the second set of two consecutive dots. The accuracy of the first slope and the second slope can be improved. Therefore, the accuracy of judging whether the edge of the screen body has deformation caused by the warping of the screen body is further improved.
In one embodiment, the determining whether the corners of the screen body have deformation caused by screen body warping comprises; determining an angular inflection point of a display area of the screen body: selecting a point on the edge of the display area connected with the corner inflection point; constructing a first preset area by taking the point as a starting point: calculating the area of an angle region corresponding to the angle inflection point in the first preset region; and when the value of the area is within the first preset range, judging that the corner of the screen body has deformation caused by screen body warping. By the method, whether the corners of the screen body are deformed due to the warping of the screen body can be judged simply and quickly.
In one embodiment, when all edges of the screen body are not deformed due to the warping of the screen body, whether the corners of the screen body are deformed due to the warping of the screen body is judged. The work efficiency is improved, and the missed detection of warping can be avoided.
In one embodiment, the first set of two consecutive points has a common point with the second set of two consecutive points; wherein the determining an angular inflection point of a display area of the screen body comprises: when the absolute value of the difference between the first slope and the second slope is greater than or equal to a second threshold, determining the common point as the angular inflection point; the selecting a point on the edge of the display area connected to the corner point comprises: selecting one point of the first continuous group of two points other than the corner point; or selecting a point of said second set of two consecutive points other than said angular inflection point.
In one embodiment, the calculating comprises calculating an area of an angular region within the first preset region corresponding to the angular inflection point; the method comprises the following steps: performing binarization processing on the angular region and the non-angular region in the first preset region: and calculating the area of the angular region according to the binarization result. The area of the angular region is calculated more accurately and conveniently through the computer binarization processing result.
In one embodiment, further comprising: acquiring the edge of a display area of the screen body; preferably, the method comprises the following steps: illuminating the screen body; acquiring an image of the screen body: virtual focus processing the image to obtain a virtual focus processed image: carrying out binarization processing on the virtual focus processed image; and acquiring the edge of the display area of the screen body according to the binarization result. Whether the edge of the screen body has deformation caused by screen body warping and whether the corner of the screen body has deformation caused by screen body warping are judged on the basis of acquiring the edge of the display area, and the accuracy of judging the screen body warping can be further improved by acquiring the edge of the display area.
In one embodiment, the screen body is a rectangular screen body, and the method further comprises: acquiring the reference side length and the reference angle of the display area of the screen body; fitting the edge of the display area of the screen body according to the orthographic projection of the display area of the screen body on the horizontal plane; acquiring the fitting side length and the fitting angle of the screen body display area; wherein the judging whether the edge of the screen body has deformation caused by screen body warping comprises: calculating an absolute value of a difference between the reference side length and the fitted side length to obtain a first absolute value; when the first absolute value is larger than a third threshold value, judging that the edge of the screen body has deformation caused by screen body warping; the judging whether the corner of the screen body has deformation caused by screen body warping comprises the following steps: calculating an absolute value of a difference between the reference angle and the fitting angle to obtain a second absolute value; and when the second absolute value is larger than a fourth threshold value, judging that the corner of the screen body has deformation caused by warping of the screen body. Therefore, the screen body can be accurately judged to be in the warping state, the screen body warping is prevented from being misjudged as a screen body defect, manual reinspection resources are saved, and material waste is avoided.
According to the screen body warpage detection method provided by the embodiment of the invention, whether the screen body warps or not is judged by judging whether the edge of the screen body has deformation caused by screen body warpage or not and judging whether the corner of the screen body has deformation caused by screen body warpage or not. And when at least one edge of the screen body has deformation caused by screen body warping or at least one corner of the screen body has deformation caused by screen body warping, judging that the screen body has warping. Therefore, the screen body can be accurately judged to be in the warping state, the misjudgment of the warping of the screen body as the defect of the screen body is avoided, the misjudgment rate is effectively reduced, and the material waste caused by misjudgment of a good product as a defective product is reduced.
Drawings
Fig. 1 is a schematic flow chart of a method for detecting a warpage of a screen according to an embodiment of the present invention.
Fig. 2 is a schematic flow chart illustrating a process of determining whether an edge of a screen body has deformation caused by screen body warpage in a screen body warpage detection method according to an embodiment of the present invention.
Fig. 3 is a schematic position diagram of three points continuously selected in the screen warpage detection method according to an embodiment of the present invention.
Fig. 4 is a schematic position diagram of continuously selecting four points in the screen warpage detection method according to an embodiment of the present invention.
Fig. 5 is a schematic flow diagram of a further embodiment of the embodiment shown in fig. 2.
Fig. 6 is a schematic flow chart of a further embodiment of the embodiment shown in fig. 5.
Fig. 7 is a schematic flow chart illustrating a process of determining whether a corner of a screen body has deformation caused by screen body warpage in a screen body warpage detection method according to an embodiment of the present invention.
Fig. 8 is a schematic position diagram illustrating a first preset region constructed in a screen warpage detection method according to an embodiment of the present invention.
Fig. 9 is a schematic flow chart illustrating a process of calculating an area of an angle region corresponding to an angle inflection point in a first predetermined region according to a method for detecting a warpage of a screen body in an embodiment of the present invention.
Fig. 10 is a schematic flow chart illustrating a method for detecting a warpage of a screen according to an embodiment of the present invention.
Fig. 11 is a schematic flow chart illustrating a process of acquiring an edge of a display area of a screen body in a screen body warpage detection method according to an embodiment of the present invention.
Fig. 12 is a schematic flow chart illustrating a method for detecting a warpage of a screen according to an embodiment of the present invention.
Detailed Description
As described in the background art, the technical problem of misjudging the screen warpage as the screen defect in the screen defect detection in the prior art exists. The inventors have found that the reason for this problem is as follows: in the existing screen defect detection technology, after a screen is lightened, a picture is taken right above the screen, and whether the screen has defects or not is judged according to the taken picture. Pictures taken in the following two cases are not easily distinguished: the image shot when the periphery of the display area of the screen body is in a warped state, and the image shot when the periphery of the display area of the screen body has Mura (the Mura name is from Japanese words, and particularly refers to a panel flaw and is used for representing the unevenness of the display area when the panel is displayed at constant brightness) or the image shot by the screen body defect such as a dark spot and the like. Resulting in misjudgment of screen body warpage as a screen body defect. In order to solve the above problems, the inventors have studied and found that the presence or absence of warpage in the panel is determined by determining whether or not there is deformation in the sides of the panel due to warpage of the panel, and determining whether or not there is deformation in the corners of the panel due to warpage of the panel. And when at least one edge of the screen body has deformation caused by screen body warping or at least one corner of the screen body has deformation caused by screen body warping, judging that the screen body has warping. Therefore, the screen body can be accurately judged to be in the warping state, the misjudgment of the warping of the screen body as the defect of the screen body is avoided, the misjudgment rate is effectively reduced, and the material waste caused by misjudgment of a good product as a defective product is reduced.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic flow chart of a method for detecting a warpage of a screen according to an embodiment of the present invention. As shown in fig. 1, the method includes the following steps.
Step 101: judging whether the edge of the screen body has deformation caused by the warping of the screen body;
specifically, when the screen body is in a warped state, the edges of the screen body deform as compared to when the screen body is in a non-warped state. Whether the screen body is in a warping state or not can be judged by judging whether the edge of the screen body has deformation caused by warping of the screen body or not.
It should be understood that the screen body can be a flexible screen or a hard screen, and when the screen body is a flexible screen, the flexible screen is easily in a warped state due to the flexible screen itself or due to insufficient adsorption force of the adsorption platform. When the screen body is a hard screen, the hard screen glass substrate may cause the screen body to warp. The embodiment of the invention does not specifically limit whether the screen body is a flexible screen or a hard screen.
Step 102: judging whether the corners of the screen body have deformation caused by the warping of the screen body;
specifically, when the screen body is in a warped state, the corners of the screen body are deformed as compared to when the screen body is in a non-warped state. Whether the screen body is in a warping state or not can be judged by judging whether the corners of the screen body have deformation caused by warping of the screen body or not.
It will be appreciated that when the panel is a rectangular panel having four rounded corners, then the corners are rounded. When the screen body is other special-shaped screens, the angle can also be an included angle, and the specific type of the angle is not limited in the embodiment of the invention.
Step 103: judging that the screen body is warped when at least one edge of the screen body has deformation caused by warping of the screen body or at least one corner of the screen body has deformation caused by warping of the screen body;
specifically, when at least one side of the screen body has deformation caused by screen body warping, the screen body is judged to have warping. And when at least one corner of the screen body has deformation caused by the warping of the screen body, judging that the screen body has warping. And when at least one edge of the screen body has deformation caused by screen body warping, and at the same time, at least one corner of the screen body has deformation caused by screen body warping, judging that the screen body has warping.
It should be understood that although the method is described in the order of steps shown in fig. 1, this should not be construed as requiring that the method be performed in the order of steps shown in fig. 1. As long as step 103 follows step 101 and step 102, the execution order of step 101 and step 102 is not particularly limited in the embodiment of the present invention.
According to the screen body warpage detection method provided by the embodiment of the invention, whether the screen body warps or not is judged by judging whether the edge of the screen body has deformation caused by screen body warpage or not and judging whether the corner of the screen body has deformation caused by screen body warpage or not. And when at least one edge of the screen body has deformation caused by screen body warping or at least one corner of the screen body has deformation caused by screen body warping, judging that the screen body has warping. Therefore, the screen body can be accurately judged to be in the warping state, the misjudgment of the warping of the screen body as the defect of the screen body is avoided, the misjudgment rate is effectively reduced, and the material waste caused by misjudgment of a good product as a defective product is reduced.
Fig. 2 is a schematic flow chart illustrating a process of determining whether an edge of a screen body has deformation caused by screen body warpage in a screen body warpage detection method according to an embodiment of the present invention. Fig. 3 is a schematic position diagram of three points continuously selected in the screen warpage detection method according to an embodiment of the present invention. Fig. 4 is a schematic position diagram of continuously selecting four points in the screen warpage detection method according to an embodiment of the present invention. As shown in fig. 2, step 101: judging whether the edge of the screen body has deformation caused by screen body warping or not, comprising the following steps:
step 1011: continuously selecting at least three points on the edge of the display area of the screen body;
specifically, the screen body is composed of an AA Area (Active Area) and a Non-AA Area (Non-Active Area). During the Cell test process, the display area is lit. The at least three points are continuously selected on the edge of the display area, and the fact that no other selected point exists between every two points in the at least three selected points is meant. It should be understood that at least three points, which may be 3 points, 4 points, 5 points, 6 points, etc., are continuously selected on the edge of the screen body, as long as the selected points are continuous and at least 3 points, and the number of the points at which the at least three points are continuously selected is not particularly limited in the embodiment of the present invention.
Step 1012: calculating to obtain a first slope according to a first group of continuous two points in at least three points;
step 1013: calculating to obtain a second slope according to a second group of continuous two points in the at least three points;
specifically, a straight line is determined by two points, after the straight line is determined, a coordinate system is established, and the slope is obtained by calculation according to the coordinates of the two points in the coordinate system.
It should be understood that if three points are consecutively selected, as shown in fig. 3, the first group of consecutive two points a1 and a2 has a common point with the second group of consecutive two points a2 and A3. If four points are selected consecutively, as shown in FIG. 4, the first group of two consecutive points may be the 1 st point A1 and the 2 nd point A2, and the first group of two consecutive points may also be the 1 st point A1 and the 3 rd point A3. As long as the first group of two continuous points and the second group of two continuous points can be selected from the at least three continuously selected points, the embodiment of the present invention does not specifically limit the selection manner of the first group of two continuous points and the second group of two continuous points in the at least three continuously selected points. As long as a coordinate system can be established and the coordinates of each point can be obtained, the method for specifically establishing the coordinate system and the method for obtaining the coordinates of the points are not limited in the embodiment of the present invention.
Step 1014: calculating the absolute value of the difference between the first slope and the second slope;
step 1015: when the absolute value of the difference value between the first slope and the second slope is larger than a first threshold and smaller than a second threshold, judging that the edge of the screen body has deformation caused by screen body warping;
specifically, when the absolute value of the difference between the first slope and the second slope is less than or equal to the first threshold, two consecutive points of the first group and two consecutive points of the second group are considered to be collinear, and the edge of the screen body is free from deformation caused by the warping of the screen body. And when the absolute value of the difference value between the first slope and the second slope is larger than the first threshold and smaller than the second threshold, the first group of two continuous points and the second group of two continuous points are considered to be non-collinear, and the edge of the screen body is judged to have deformation caused by the warping of the screen body.
It should be appreciated that the first threshold may be zero and the second threshold may be 0.05. The first threshold and the second threshold may be determined in various manners, for example, different values may be selected according to specific positions of the first group of two consecutive points and the second group of two consecutive points on the edge of the screen display area.
In the embodiment of the invention, at least three points are continuously selected on the edge of the screen body, a first slope is obtained by calculating the coordinates of a first group of continuous two points of the at least three points, and a second slope is obtained by calculating the coordinates of a second group of continuous two points of the at least three points. And calculating the absolute value of the difference value between the first slope and the second slope, and comparing the relationship between the absolute value and the first threshold and the second threshold to judge whether the first group of continuous two points and the second group of continuous two points are collinear or not, so as to judge whether at least three continuously selected points are collinear or not and further judge whether the edge of the screen body has deformation caused by screen body warping or not.
Fig. 5 is a schematic flow diagram of a further embodiment of the embodiment shown in fig. 2. As shown in fig. 5, the above step 101: judging whether the edge of the screen body has deformation caused by screen body warping, further comprising:
Specifically, the edge of the screen display area is divided into a middle section and two side sections, the first group of continuous two points and the second group of continuous two points are located on the two side sections, and compared with the situation that the first group of continuous two points and the second group of continuous two points are located on the middle section, the first threshold value is larger, and the second threshold value is larger.
The first threshold value and the second threshold value are set according to the specific positions of the first group of continuous two points and the second group of continuous two points on the edge of the screen body display area, so that whether the edge of the screen body has deformation caused by screen body warping can be judged more accurately.
Fig. 6 is a schematic flow chart of a further embodiment of the embodiment shown in fig. 5. As shown in fig. 6, step 1011: continuously selecting at least three points on the edge of the display area of the screen body, comprising the following steps:
step 10111: continuously selecting 3N (N is more than or equal to 1) points on the edge of the display area of the screen body;
specifically, N is an integer and N.gtoreq.1.
Step 10112: dividing 3N points into N groups;
step 1012: includes the steps of 1012': calculating to obtain a first slope according to a first group of continuous two points in the 3 points in each group;
step 1013: comprising the step 1013': calculating to obtain a second slope according to a second group of continuous two points in the 3 points in each group;
in particular, since there are only three points per packet, a first set of two consecutive points has one point in common with a second set of two consecutive points.
Step 1014: comprising the following steps 1014': calculating an absolute value of a difference of the first slope and the second slope for each packet;
specifically, the absolute values of the differences between the first slopes and the second slopes of the first group of two consecutive points and the second group of two consecutive points are calculated, respectively.
Specifically, the edge of the screen display area may be divided into a middle segment and two side segments, and the first threshold value is larger and the second threshold value is larger at three points of each group located in the two side segments than at the middle segment. The edge of the screen body display area can also be divided into M sections (M is less than or equal to N), and the first threshold value and the second threshold value of each section are different. And setting a first threshold value and a second threshold value of each group according to the selected specific section of the M sections of the edges of the display area of the screen body of the 3 points in each group. The embodiment of the invention does not limit the specific number of the sections into which the edges of the display area of the screen body are divided.
step 10151: comparing the absolute value of the difference value of the first slope and the second slope of each group with a corresponding first threshold and a corresponding second threshold;
step 10152: and when the absolute value of the difference value between the first slope and the second slope of at least one packet is greater than the corresponding first threshold and less than the corresponding second threshold, judging that the edge of the screen body has deformation caused by screen body warping.
When a plurality of continuously selected points are available, the grouping judgment can be performed, the calculation efficiency is improved, and the calculation time is saved.
In one embodiment, the distance between a first set of consecutive two points is the same as the distance between a second set of consecutive two points; the distance between one point of the second group of continuous two points close to the first group of continuous two points and one point of the first group of continuous two points close to the second group of continuous two points is a fixed length.
Specifically, as shown in fig. 3, if three points are consecutively selected, the second point a2 is a midpoint of a connecting line between the first point a1 and the third point A3, and the fixed length is zero. As shown in fig. 4, if four points are consecutively selected, the distance between the first point a1 and the second point a2 is equal to the distance between the third point A3 and the fourth point a 4. The distance between the second point a2 and the third point A3 is a fixed length.
It should be understood that when at least three points are continuously selected to be equal to or greater than four points, the fixed step size may be the length of one sub-pixel, or may be the length of two sub-pixels. The embodiment of the present invention does not specifically limit the fixed length. The fixed length setting can improve the accuracy of slope calculation and further improve the accuracy of judging whether the edge of the screen body has deformation caused by screen body warping.
It should be understood that when the continuously selected points are at least four points, a plurality of groups can be performed on the points, a plurality of slopes can be determined according to the groups, and the slopes can be simultaneously compared, whether the absolute value of the difference value between any two slopes is greater than the corresponding first threshold and less than the corresponding second threshold is satisfied; or two slopes of the two groups are arbitrarily selected to compare absolute values of the difference values, and whether the absolute values are larger than the corresponding first threshold and smaller than the corresponding second threshold is judged, so that the next step of judgment is carried out.
In one embodiment, the first set of two consecutive points has a common point with the second set of two consecutive points. As shown in fig. 3, the first group of two consecutive points a1 and a2 has a common point a2 with the second group of two consecutive points a2 and A3, so that the points for calculating the first slope and the second slope have a common point, and the accuracy of the first slope and the second slope can be improved. Therefore, the accuracy of judging whether the edge of the screen body has deformation caused by the warping of the screen body is further improved. Fig. 7 is a schematic flow chart illustrating a process of determining whether a corner of a screen body has deformation caused by screen body warpage in a screen body warpage detection method according to an embodiment of the present invention. Fig. 7 is a schematic position diagram illustrating a first preset region constructed in a screen warpage detection method according to an embodiment of the present invention. As shown in fig. 7, the above step 102: judging whether the corners of the screen body have deformation caused by screen body warping or not, comprising the following steps:
step 1021: determining an angular inflection point of a display area of the screen body;
specifically, an angle exists in a display area of the screen body, and the determination of the angle inflection point is beneficial to accurately positioning an angle area, so that whether the angle of the screen body has deformation caused by the warping of the screen body is judged.
Step 1022: selecting a point on the edge of the display area connected with the corner inflection point;
step 1023: constructing a first preset area by taking one point as a starting point;
specifically, after the corner inflection point is determined, it is necessary to construct the first preset region by selecting a point on the side of the display region connected to the corner inflection point as a starting point. Selecting a point on the edge of the display area connected with the corner inflection point, wherein the first area is drawn from the selected point on the edge of the display area, and the first area is not drawn from the inflection point directly, so that the first preset area more easily comprises the whole corner area. The omission of the corner regions is avoided, so that the accuracy of the calibration is improved.
It should be understood that a method of constructing the first preset region with a point as a starting point may be as follows. As shown in fig. 8, when a5 is an inflection point, a rectangle with a length of a and a width of b is drawn with a6 as a starting point. Wherein the values of a and b can be determined according to actual requirements. Although the first preset region is configured in the positional relationship shown in fig. 8, this should not be construed as the first preset region can be configured only in the positional relationship shown in fig. 8. As long as a point on the edge of the display region connected to the corner point is a starting point to construct the first predetermined region, the embodiment of the present invention does not limit a specific construction manner of the first predetermined region.
Step 1024: calculating the area of an angle region corresponding to the angle inflection point in a first preset region;
specifically, an angular region and a non-angular region corresponding to the angular inflection point exist in the first preset region, and the area of the angular region can be calculated for further determination.
It should be understood that the method for calculating the area of the corner region may be a computer binarization calculation method, or may be a calculation method that fits a polynomial according to a projection of the corner region on a horizontal plane, as long as the area of the corner region can be calculated, and the calculation method of the corner region area in the embodiment of the present invention is not particularly limited.
Step 1025: when the value of the area is within a first preset range, judging that the corners of the screen body have deformation caused by the warping of the screen body;
specifically, when there is no deformation of the corners of the screen due to the warpage of the screen, the area of the corner regions without deformation in the predetermined region has a maximum value, and the area of the corner regions with deformation in the predetermined region is smaller than the maximum value. The first predetermined range may be set with reference to a maximum value in combination with tolerance, etc. And when the area value of the angle region in the preset region is in a first preset range, judging that the angle of the screen body has deformation caused by screen body warping.
It should be understood that a screen body includes at least one corner. When the screen body is a rectangular screen body with four round corners, the screen body has four corners, so that four first preset ranges exist, and the value ranges of the four first preset ranges can be different. The first preset range can be different ranges according to different positions of the angle position on the screen body and different screen body types. The value of the first preset range is not particularly limited in the embodiment of the present invention.
In the embodiment of the invention, the position of the corner point is determined, a first preset region is constructed at one point on the edge of the display region connected with the corner point, the area of the corner region in the first preset region is calculated, and whether the corner of the screen body is deformed due to the warping of the screen body is judged by comparing whether the area of the corner region in the first preset region is in a first preset range.
In one embodiment, when all edges of the screen body have no deformation caused by the warping of the screen body, whether the corners of the screen body have the deformation caused by the warping of the screen body is judged.
Specifically, when at least one side of the screen body has deformation caused by screen body warpage, the screen body can be judged to have warpage, and whether the corner of the screen body has deformation caused by screen body warpage or not does not need to be judged. And when all edges of the screen body do not have deformation caused by screen body warping, judging whether the corners of the screen body have deformation caused by screen body warping. The work efficiency is improved, and the missed detection of warping can be avoided.
In a further embodiment, the first set of two consecutive points has a common point with the second set of two consecutive points; wherein determining an angular inflection point of a display area of the screen body comprises: when the absolute value of the difference value between the first slope and the second slope is greater than or equal to a second threshold value, determining that the common point is an inflection point; selecting a point on the edge of the display area connected to the corner point comprises: selecting one point of the first group of two continuous points, which is not the corner point; or selecting one of a second set of two consecutive points other than the corner point.
Specifically, as shown in fig. 8, the first group of two consecutive dots a4 and a5 and the second group of two consecutive dots a5 and a6 have a common dot a 5. The first slope is obtained by calculation according to A4 and A5, and the second slope is obtained by calculation according to A5 and A6. An absolute value of a difference between the first slope and the second slope is calculated. And when the absolute value of the difference value between the first slope and the second slope is larger than the first threshold and smaller than the second threshold, judging that the edge of the screen body has deformation caused by the warping of the screen body. The screen body can be judged to be warped, and whether the corners of the screen body are deformed due to warping of the screen body or not is not required to be judged. When the absolute value of the difference between the first slope and the second slope is greater than or equal to the second threshold, the common point a5 is determined to be an angular inflection point. Selecting a point A4 or A6 to construct a first preset region according to the step 1023, calculating the area of the corner region according to the step 1024, and judging that the corner of the screen body has deformation caused by screen body warping according to the step 1025, which is not described herein again.
Fig. 9 is a schematic flow chart illustrating a process of calculating an area of an angle region corresponding to an angle inflection point in a first predetermined region in a screen warpage detection method according to an embodiment of the present invention. As shown in fig. 9, the above step 1024: calculating the area of an angle region corresponding to the angle inflection point in a first preset region, comprising the steps of:
step 10241: carrying out binarization processing on an angle area and a non-angle area in a first preset area;
specifically, the computer obtains an image of a first preset area, since the screen body is in a lighting state during the warpage detection, the corner area is in a lighting state, and the non-corner area is in a non-lighting state, and the computer performs binarization processing on the first preset area, wherein the lighting area default value is 1, and the non-lighting area default value is 0.
Step 10242: and calculating the area of the angular region according to the binarization result.
Specifically, the computer calculates an area with a default value of 1 from the binarization result.
It should be understood that, as long as the computer can calculate the area with the default value of 1 according to the binarization result, the specific calculation process is not limited in the embodiment of the present invention. The area of the angular region is calculated more accurately and conveniently through the computer binarization processing result.
Fig. 10 is a schematic flow chart illustrating a method for detecting a warpage of a screen according to an embodiment of the present invention. As shown in fig. 10, the method for detecting the warpage of the screen further includes: step 100: and acquiring the edge of the display area of the screen body.
The screen body is provided with a display area and a non-display area, and whether the edge of the screen body has deformation caused by screen body warping or not and whether the corner of the screen body has deformation caused by screen body warping or not are judged on the basis of knowing the edge of the display area.
Fig. 11 is a schematic flow chart illustrating a process of acquiring an edge of a display area of a screen body in a screen body warpage detection method according to an embodiment of the present invention. As shown in fig. 11, the above step 100: the method for acquiring the edge of the display area of the screen body comprises the following steps:
step 1001: lightening the screen body;
specifically, when the screen body is subjected to warpage detection or screen body defect detection, the screen body needs to be lighted, and since the display area of the screen body has sub-pixels, the sub-pixels of the display area are lighted, and the display area of the screen body is lighted.
Step 1002: acquiring an image of a screen body;
specifically, an image of the screen body may be acquired by a camera or the like.
It should be understood that the image of the screen needs to clearly see the sub-pixels as long as the acquired image of the screen can clearly see the sub-pixels, and the apparatus for acquiring the screen image is not particularly limited in the embodiments of the present invention.
Step 1003: processing the image by virtual focus to obtain an image after virtual focus processing;
specifically, the screen display area can be lighted because each sub-pixel in the display area is lighted, and there is a tiny gap between each sub-pixel, when an image is shot, the gap between each sub-pixel can affect the acquisition of the edge of the display area, so the image is blurred, and the tiny gap between each sub-pixel is blurred.
It should be understood that the embodiment of the present invention does not limit the specific blurring method as long as the virtual focus processing of the image is implemented.
Step 1004: carrying out binarization processing on the virtual focus processed image;
specifically, the image after the virtual focus processing is subjected to binarization processing, and the default value of the edge area of the display area is 1, and the default value of the non-edge area is 0.
Step 1005: and acquiring the edge of the display area of the screen body according to the binarization result.
Specifically, the computer acquires the edge of the display area with the default value of 1 according to the binarization result.
It should be understood that the computer only needs to be able to obtain the edge of the display area with the default value of 1 according to the binarization result, and the specific obtaining process is not limited in the embodiment of the present invention.
In the embodiment of the invention, the image is processed in a blurring way, and the tiny gaps among the pixels are blurred, so that the display area and the non-display area of the screen body can be more clearly displayed. The edge of the display area of the screen body is obtained through the image after the binarization virtual focus processing, so that the edge of the display area of the screen body can be accurately described, and the accuracy of the screen body warpage detection is improved. Fig. 12 is a schematic flow chart illustrating a method for detecting a warpage of a screen according to an embodiment of the present invention. As shown in fig. 12, the method for detecting the warpage of the screen body further includes the following steps:
step 201: acquiring the reference side length and the reference angle of a display area of a screen body;
specifically, the reference side length of the screen display area is the side length of the display area when no warpage of the screen exists. The reference angle of the display area of the screen body is the angle of the display area when no warpage of the screen body exists.
It should be understood that the reference side length and the reference angle of the display area of the screen body may be obtained as follows: and screening out a non-warped reference screen through manual inspection in the same batch of screen bodies, lighting up the reference screen, and obtaining the reference side length and the reference angle of the reference screen. The method for obtaining the reference side length and the reference angle of the display area of the screen body can also be as follows: when the screen body is manufactured, the design parameters of the display area of the screen body are obtained, the design side length of the display area is used as the reference side length, and the design angle of the display area is used as the participation angle. As long as the reference side length and the reference angle of the display area of the screen body can be obtained, the specific obtaining method is not limited in the embodiment of the present invention.
Step 202: fitting the edge of the display area of the screen body according to the orthographic projection of the display area of the screen body on the horizontal plane;
specifically, when the screen body is subjected to warpage detection, the screen body is flatly placed on a horizontal adsorption platform, and the edge of the display area of the screen body is fitted according to the orthographic projection of the display area of the screen body on the horizontal plane.
It should be understood that the method for fitting the edge of the display area of the screen body may be polynomial fitting, as long as the edge of the display area of the screen body can be fitted, and the embodiment of the present invention does not limit the specific fitting method.
Step 203: acquiring the fitting side length and the fitting angle of a screen body display area;
specifically, the fitting side length and the fitting angle of the display area of the screen body are obtained according to the fitting side of the display area of the screen body.
It should be understood that the obtaining of the fitting side length and the fitting angle according to the fitting side may be manual measurement or machine measurement, as long as the fitting side length and the fitting angle can be obtained, and the obtaining method is not particularly limited in the embodiment of the present invention.
Step 101: judging whether the edge of the screen body has deformation caused by screen body warping or not, comprising the following steps:
specifically, when the absolute value of the difference value between the reference side length and the fitted side length is larger than the third threshold, the side of the screen body is judged, and deformation caused by screen body warping exists on the side of the screen body.
It should be understood that the third threshold may be zero, or may be other values. The third threshold is set manually, and different values can be selected according to different screen bodies.
Step 102: judging whether the corners of the screen body have deformation caused by screen body warping or not, comprising the following steps:
Specifically, when the absolute value of the difference between the reference angle and the fitting angle is greater than the fourth threshold, it is determined that the angle of the screen body has deformation caused by warping of the screen body.
It should be appreciated that the fourth threshold may be zero or may be other values. The fourth threshold value can be selected to be different according to different screen bodies.
According to the screen body warpage detection method provided by the embodiment of the invention, the fitting side length and the fitting angle are obtained through the edge of the display area of the fitting screen body. And respectively comparing the reference side length with the fitted side length so as to judge that the side of the screen body has deformation caused by screen body warping. And judging whether the angle of the screen body has deformation caused by the warping of the screen body by comparing the reference angle with the fitting angle. And then judging whether the screen body is warped or not.
And when the absolute value of the difference value between the reference side length and the fitted side length is larger than a third threshold value, judging the side of the screen body and judging the deformation of the side of the screen body caused by the warping of the screen body. And when the absolute value of the difference value between the reference angle and the fitting angle is larger than a fourth threshold value, judging that the angle of the screen body has deformation caused by the warping of the screen body. When at least one edge of the screen body has deformation caused by screen body warping or at least one corner of the screen body has deformation caused by screen body warping, the screen body is judged to have warping. Therefore, the screen body can be accurately judged to be in the warping state, the screen body warping is prevented from being misjudged as a screen body defect, manual reinspection resources are saved, and material waste is avoided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and the like that are within the spirit and principle of the present invention are included in the present invention.
Claims (9)
1. A screen body warping detection method is characterized by comprising the following steps:
judging whether the edge of the screen body has deformation caused by screen body warpage, wherein the judging whether the edge of the screen body has deformation caused by screen body warpage comprises the following steps: continuously selecting at least three points on the edge of the display area of the screen body; calculating to obtain a first slope according to a first group of continuous two points in the at least three points; calculating to obtain a second slope according to a second group of continuous two points in the at least three points; calculating an absolute value of a difference between the first slope and the second slope; when the absolute value of the difference value between the first slope and the second slope is larger than a first threshold and smaller than a second threshold, judging that the edge of the screen body has deformation caused by screen body warping;
judging whether the corner of the screen body has deformation caused by screen body warping, wherein the judging whether the corner of the screen body has deformation caused by screen body warping comprises the following steps: determining an angular inflection point of a display area of the screen body: selecting a point on the edge of the display area connected with the corner inflection point; constructing a first preset area by taking the point as a starting point: calculating the area of an angle region corresponding to the angle inflection point in the first preset region; when the value of the area is within a first preset range, judging that the corner of the screen body has deformation caused by screen body warping; and
and when at least one edge of the screen body has deformation caused by screen body warping or at least one corner of the screen body has deformation caused by screen body warping, judging that the screen body has warping.
2. The screen body warpage detection method of claim 1, wherein a distance between the first set of consecutive two points is the same as a distance between the second set of consecutive two points; the distance between one point of the second group of continuous two points close to the first group of continuous two points and one point of the first group of continuous two points close to the second group of continuous two points is a fixed length.
3. The screen body warpage detection method of claim 1, wherein the first set of two consecutive points and the second set of two consecutive points have a common point.
4. The screen body warpage detection method of claim 1, wherein when there is no deformation caused by screen body warpage on all sides of the screen body, it is determined whether there is deformation caused by screen body warpage at corners of the screen body.
5. The screen body warpage detection method of claim 1, wherein the first set of two consecutive points and the second set of two consecutive points have a common point;
wherein the determining an angular inflection point of a display area of the screen body comprises:
when the absolute value of the difference between the first slope and the second slope is greater than or equal to a second threshold, determining the common point as the angular inflection point;
the selecting a point on the edge of the display area connected to the corner point comprises:
selecting one point of the first continuous group of two points other than the corner point; or
Selecting a point of the second set of two points other than the corner point.
6. The screen body warpage detection method according to claim 1, wherein the calculating is performed to calculate an area of an angular region corresponding to the angular inflection point within the first preset region; the method comprises the following steps:
performing binarization processing on the angular region and the non-angular region in the first preset region: and
and calculating the area of the corner region according to the binarization result.
7. The screen body warpage detection method of any one of claims 2-3, further comprising: and acquiring the edge of the display area of the screen body.
8. The screen body warpage detection method of claim 7, wherein the obtaining of the edge of the display area of the screen body comprises:
illuminating the screen body;
acquiring an image of the screen body:
virtual focus processing the image to obtain a virtual focus processed image:
carrying out binarization processing on the virtual focus processed image; and
and acquiring the edge of the display area of the screen body according to the binarization result.
9. The screen body warpage detection method of claim 1, wherein the screen body is a rectangular screen body, the method further comprising:
acquiring the reference side length and the reference angle of the display area of the screen body;
fitting the edge of the display area of the screen body according to the orthographic projection of the display area of the screen body on the horizontal plane; and
acquiring the fitting side length and the fitting angle of the screen body display area;
wherein the judging whether the edge of the screen body has deformation caused by screen body warping comprises:
calculating an absolute value of a difference between the reference side length and the fitted side length to obtain a first absolute value; and
when the first absolute value is larger than a third threshold value, judging that the edge of the screen body has deformation caused by screen body warping;
the judging whether the corner of the screen body has deformation caused by screen body warping comprises the following steps:
calculating an absolute value of a difference between the reference angle and the fitting angle to obtain a second absolute value; and
and when the second absolute value is larger than a fourth threshold value, judging that the corner of the screen body has deformation caused by the warping of the screen body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910695761.6A CN110243336B (en) | 2019-07-30 | 2019-07-30 | Screen body warping detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910695761.6A CN110243336B (en) | 2019-07-30 | 2019-07-30 | Screen body warping detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110243336A CN110243336A (en) | 2019-09-17 |
| CN110243336B true CN110243336B (en) | 2021-08-24 |
Family
ID=67893706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910695761.6A Active CN110243336B (en) | 2019-07-30 | 2019-07-30 | Screen body warping detection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110243336B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112212812B (en) * | 2020-10-13 | 2023-05-02 | 联想(北京)有限公司 | Detection device and detection method |
| CN113834462A (en) * | 2021-08-05 | 2021-12-24 | 山西光兴光电科技有限公司 | Method and device for detecting warping of glass substrate |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102156972A (en) * | 2011-04-19 | 2011-08-17 | 清华大学 | Image tilting correcting method and system |
| CN106248053A (en) * | 2016-08-31 | 2016-12-21 | 铁道第三勘察设计院集团有限公司 | Existing Railway Line plane center line manufacture method based on aerial survey mode |
| KR20170106035A (en) * | 2016-03-11 | 2017-09-20 | 강원대학교산학협력단 | Prediction Method of Slope Failure |
| CN108280822A (en) * | 2017-12-20 | 2018-07-13 | 歌尔科技有限公司 | The detection method and device of screen cut |
| CN207730192U (en) * | 2017-09-07 | 2018-08-14 | 昆山世铭金属塑料制品有限公司 | A kind of rotatory testboard of casing deformation detection |
-
2019
- 2019-07-30 CN CN201910695761.6A patent/CN110243336B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102156972A (en) * | 2011-04-19 | 2011-08-17 | 清华大学 | Image tilting correcting method and system |
| KR20170106035A (en) * | 2016-03-11 | 2017-09-20 | 강원대학교산학협력단 | Prediction Method of Slope Failure |
| CN106248053A (en) * | 2016-08-31 | 2016-12-21 | 铁道第三勘察设计院集团有限公司 | Existing Railway Line plane center line manufacture method based on aerial survey mode |
| CN207730192U (en) * | 2017-09-07 | 2018-08-14 | 昆山世铭金属塑料制品有限公司 | A kind of rotatory testboard of casing deformation detection |
| CN108280822A (en) * | 2017-12-20 | 2018-07-13 | 歌尔科技有限公司 | The detection method and device of screen cut |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110243336A (en) | 2019-09-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107024485B (en) | The defect inspection method and device of camber display screen | |
| CN110243336B (en) | Screen body warping detection method | |
| CN111025701B (en) | Curved surface liquid crystal screen detection method | |
| CN110620887B (en) | Image generation device and image generation method | |
| CN105205803A (en) | Display panel defect detection method | |
| KR20110078958A (en) | Apparatus for inspecting outward aspect of lcd panel | |
| JP5384264B2 (en) | Tire appearance inspection device | |
| CN106405894B (en) | A kind of liquid crystal display panel defect automatic positioning method | |
| KR20160031142A (en) | Mura Detecting Device | |
| CN112198685B (en) | COA substrate detection method and device | |
| WO2019144482A1 (en) | Mura repair method for display panel | |
| US10788430B2 (en) | Surface inspection apparatus and surface inspection method | |
| JP5050398B2 (en) | Display panel inspection method, inspection apparatus, and manufacturing method | |
| KR20140082333A (en) | Method and apparatus of inspecting mura of flat display | |
| WO2012042583A1 (en) | Glass bottle inspection device | |
| CN106646939B (en) | A kind of Mura defects method for detecting | |
| CN112837285B (en) | Edge detection method and device for panel image | |
| JP2006201523A (en) | Method and instrument for inspecting liquid crystal display panel | |
| KR100859533B1 (en) | Position calibration method of display panel | |
| US20170124688A1 (en) | Image processor, image processing method, and measuring apparatus | |
| KR20210043326A (en) | Method for inspecting film | |
| CN111665260A (en) | Display panel inspection device | |
| JP2001074600A (en) | Method and device for evaluating orientation condition of liquid crystal substrate, device for monitoring manufacture of the liquid crystal substrate, and the lquid crystal substrate | |
| KR101940762B1 (en) | Automatic Inspection Apparatus For Display Module And Inspecting Method Of Image Quality Using The Same | |
| KR20180026943A (en) | Apparatus for inspecting attaching positoin of display window |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |