CN110376218B - Method and device for detecting residual image of display panel - Google Patents

Method and device for detecting residual image of display panel Download PDF

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CN110376218B
CN110376218B CN201910690132.4A CN201910690132A CN110376218B CN 110376218 B CN110376218 B CN 110376218B CN 201910690132 A CN201910690132 A CN 201910690132A CN 110376218 B CN110376218 B CN 110376218B
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image
display panel
detection
detected
identification code
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CN110376218A (en
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马悦兴
朱修剑
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Kunshan Govisionox Optoelectronics Co Ltd
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Kunshan Govisionox Optoelectronics Co Ltd
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    • G—PHYSICS
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    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
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    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
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    • G02F1/1309—Repairing; Testing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
    • G01N2021/8887—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges based on image processing techniques
    • G—PHYSICS
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    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N2021/9511—Optical elements other than lenses, e.g. mirrors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N2021/9513—Liquid crystal panels

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Abstract

The invention discloses a method and a device for detecting a residual image of a display panel. The method for detecting the ghost of the display panel comprises the following steps: controlling a display panel to be detected to display a first picture, wherein the first picture comprises images of a first gray scale value and a second gray scale value with preset identification code information; switching the first picture into a second picture, wherein the second picture comprises an image with a third gray-scale value, and the third gray-scale value is positioned between the first gray-scale value and the second gray-scale value; continuously collecting the second picture by using an image collector at regular time to obtain a plurality of detection images; and determining the last detection image containing the identification code information in the image acquisition time sequence so as to determine the residual image disappearance time of the display panel to be detected. The method for detecting the residual image of the display panel can objectively and accurately evaluate the residual image disappearance time of the display panel and provide a reliable basis for quality evaluation of the display panel.

Description

Method and device for detecting residual image of display panel
Technical Field
The invention belongs to the technical field of display, and particularly relates to a method and a device for detecting a residual image of a display panel.
Background
Before the display panel is shipped, various indexes of the display panel need to be detected, wherein the residual shadow disappearance time is an important index for evaluating the quality of the display panel. The ghost refers to a phenomenon that when a display panel displays one picture for a period of time and is switched to another picture, the previous picture is remnant and can disappear after a period of time.
How to accurately and effectively detect the residual image disappearance time of the display panel and objectively evaluate the quality of the display panel becomes a problem to be solved urgently at present.
Disclosure of Invention
The embodiment of the invention provides a method and a device for detecting a residual image of a display panel, aiming at accurately detecting the residual image disappearance time of the display panel.
In a first aspect, the present invention provides a method for detecting an afterimage of a display panel, including: controlling a display panel to be detected to display a first picture, wherein the first picture comprises an image with a first gray scale value and a second gray scale value of preset identification code information; switching the first picture into a second picture, wherein the second picture comprises an image with a third gray scale value, and the third gray scale value is positioned between the first gray scale value and the second gray scale value; continuously collecting the second picture at regular time by using an image collector to obtain a plurality of detection images; and determining the last detection image containing the preset identification code information in the image acquisition time sequence so as to determine the residual shadow disappearance time of the display panel to be detected.
According to an aspect of the present invention, determining a last detection image including preset identification code information in an image acquisition time sequence to determine a residual image disappearance time of a display panel to be detected includes: identifying the detection image to obtain image information of the detection image; comparing the image information of the detected image with the preset identification code information to determine the last detected image containing the preset identification code information in the image acquisition time sequence; and determining the residual image disappearance time of the display panel to be detected according to the time stamp of the last detection image containing the preset identification code information.
According to one aspect of the present invention, recognizing a detection image to obtain image information of the detection image comprises: performing image processing on the detection image to increase the contrast of the detection image; and identifying the processed detection image to obtain the image information of the detection image.
According to one aspect of the invention, the method for acquiring a plurality of detection images by using an image acquirer to acquire a second picture in a timed and continuous manner comprises the following steps: adjusting the position of the image collector to enable a camera of the image collector to be over against the light-emitting surface of the display panel to be detected; continuously photographing a display panel to be detected at regular time by using an image collector to obtain an original image; the original image is cropped to obtain a detection image.
According to one aspect of the invention, the method for acquiring a plurality of detection images by using an image acquirer to acquire a second picture in a timed and continuous manner comprises the following steps: continuously photographing a display panel to be detected at regular time by using an image collector to obtain an original image; performing tilt correction on the original image; the tilt-corrected image is cropped to acquire a detection image.
According to one aspect of the invention, the image collector comprises a camera, and the resolution of the camera is greater than that of the display panel to be detected; preferably, the resolution of the camera of the image collector is greater than or equal to 3 times of the resolution of the display panel to be detected.
According to one aspect of the invention, the image collector is a camera, and the exposure time of the camera is less than the interval time between two adjacent detection images; preferably, the exposure time is less than 1 second.
According to an aspect of the present invention, the first gray scale value is 255, the second gray scale value is 0, and the third gray scale value is 48 to 128.
According to an aspect of the present invention, in the step of controlling the display panel to be detected to display the first picture, the first picture is displayed for a predetermined time; preferably, the predetermined period of time is 1 minute to 10 minutes.
In a second aspect, the present invention provides a display panel image sticking detection apparatus, including: the control module is configured to control the display panel to be detected to display a first picture, wherein the first picture comprises an image with a first gray scale value and a second gray scale value of preset identification code information; the switching module is configured to switch the first picture into a second picture, wherein the second picture comprises an image with a third gray-scale value, and the third gray-scale value is positioned between the first gray-scale value and the second gray-scale value; the acquisition module is configured to acquire the second picture by utilizing the image acquisition device in a timed and continuous mode so as to acquire a plurality of detection images; the determining module is configured to determine the last detection image containing the identification code information in the image acquisition time sequence so as to determine the afterimage disappearance time of the display panel to be detected.
In the embodiment of the invention, a first picture is displayed by controlling a display panel to be detected, the first picture comprises an image with a first gray scale value and a second gray scale value of preset identification code information, the first picture is switched into a second picture comprising an image with a third gray scale value, the second picture is continuously acquired at regular time to obtain a plurality of detection images, and then the last detection image containing the identification code information in an image acquisition time sequence is determined to determine the residual image disappearance time of the display panel to be detected. The residual shadow disappearance time of the display panel can be objectively and accurately evaluated, and a reliable basis is provided for quality evaluation of the display panel.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flowchart illustrating a method for detecting a residual image on a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a display panel to be detected displaying a first picture;
FIG. 3 is a schematic diagram of the display panel to be detected displaying a second picture;
FIG. 4 is a schematic diagram of a detected image obtained after image acquisition of a second picture;
FIG. 5 is a flow diagram of step 300 in one embodiment of the method shown in FIG. 1;
FIG. 6 is a flow chart of step 300 in another embodiment of the method shown in FIG. 1;
FIG. 7 is a flow diagram of step 400 in one embodiment of the method shown in FIG. 1;
fig. 8 is a schematic structural diagram of a display panel image sticking detection apparatus according to an embodiment of the present invention.
Reference numerals:
10-a first picture; 11-an image with preset identification code information; 11 a-subunits of first gray scale values; 11 b-subunits of second gray level values; 20-a second picture; 30-detect the image.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order to avoid unnecessarily obscuring the present invention; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The directional terms appearing in the following description are intended to be illustrative in all directions, and are not intended to limit the specific construction of embodiments of the present invention. In the description of the present invention, it should also be noted that, unless otherwise explicitly stated or limited, the terms "mounted" and "connected" are to be construed broadly, e.g., as being fixed or detachable or integrally connected; can be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The embodiments will be described in detail below with reference to the accompanying drawings.
The method and the apparatus for detecting the residual image of the display panel according to the embodiment of the invention are described in detail with reference to fig. 1 to 8.
The Display panel in this embodiment may be a Liquid Crystal Display (LCD) panel, or may also be a Display panel of an Organic Light-Emitting Diode (OLED) or a Display panel of a Micro-LED (Micro-LED), and the type of the Display panel is not limited in the present invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for detecting a residual image of a display panel according to an embodiment of the present invention, where the method for detecting a residual image of a display panel includes:
and step 100, controlling the display panel to be detected to display a first picture.
Referring to fig. 2, fig. 2 is a schematic diagram illustrating a display panel to be detected displaying a first frame. The first screen 10 of the embodiment includes an image 11 with preset identification code information, and the image 11 with the preset identification code information includes a first gray level sub-element 11a and a second gray level sub-element 11 b. That is, in the first frame 10, the first gray-scale value sub-unit 11a and the second gray-scale value sub-unit 11b together form the image 11 having the predetermined identification code information, and the arrangement of the first gray-scale value sub-unit 11a and the second gray-scale value sub-unit 11b is not limited in the present invention as long as the image 11 having the predetermined identification code information can be arranged and formed. The present invention is also not limited to the position where the image 11 with the preset identification code information is displayed on the display panel to be detected, and for example, the position may be located at the center of the display panel to be detected.
Step 200, the first frame is switched to the second frame.
Referring to fig. 3, fig. 3 is a schematic diagram illustrating a second frame displayed on the display panel to be detected. The second frame 20 of the present embodiment includes an image with a third gray scale value, wherein the third gray scale value is between the first gray scale value and the second gray scale value.
And step 300, utilizing the image collector to continuously collect the second picture at regular time to obtain a plurality of detection images.
Referring to fig. 4, fig. 4 is a schematic diagram illustrating a detection image obtained after image acquisition is performed on a second frame. The detection image 30 is an image acquired by acquiring the image displayed in the display panel to be detected by using the image acquirer during the process of completely switching the first image 10 to the second image 20. In this process, the image 11 with the preset identification code information included in the detection image 30 gradually disappears. In this step, the time interval for acquiring the plurality of detection images 30 may be set according to the requirement, and the present invention is not limited thereto. For example, the image acquisition may be performed once every a certain time interval, which may be 1 second, for example. Because the initial stage is switched, the afterimage phenomenon is obvious, and therefore, the interval between two adjacent image acquisitions can be gradually reduced in the continuous acquisition process, so that the acquisition times can be reduced in the initial stage of acquisition. And image acquisition can be carried out after switching for a certain time according to the empirical value.
Step 400, determining the last detection image containing the preset identification code information in the image acquisition time sequence so as to determine the residual image disappearance time.
In the acquired detection images 30, according to the image acquisition time sequence, the first frame 11 in the detection image 30 gradually disappears, and it can be determined that the last detection image 30 containing the preset identification code information no longer contains the preset identification code information, and the time difference between the time corresponding to the last detection image 30 containing the preset identification code information and the switching start time can be used as the afterimage disappearance time.
In this embodiment, the display panel to be detected is controlled to display the first picture 10, the first picture 10 includes an image with a first gray scale value and a second gray scale value of identification code information, the first picture 10 is switched to the second picture 20 including an image with a third gray scale value, the second picture 20 is continuously collected at regular time to obtain a plurality of detection images 30, and then the last detection image 30 including the preset identification code information in the image collection time sequence is determined to determine the ghost disappearance time of the display panel to be detected. The residual shadow disappearance time of the display panel can be objectively and accurately evaluated, and a reliable basis is provided for the quality evaluation of the display panel.
In some optional embodiments, in step 100, the first screen 10 is displayed for a preset time. The longer the first frame 10 is displayed, the better the accuracy of the ghost test is, and in consideration of the test efficiency, the preset time may be 1 minute to 10 minutes.
In some optional embodiments, the first gray-scale value and the second gray-scale value may be a maximum value and a minimum value of gray scales that can be displayed by the display panel to be detected, so as to improve accuracy of detecting an afterimage of the display panel. The first gray scale value may be 255 and the second gray scale value may be 0, so that the image 11 having the predetermined identification code information included in the first frame 10 is an identification code pattern composed of a black subunit and a white subunit. The identification code pattern can be any one or more patterns such as a two-dimensional code and a bar code, and preset information can be identified. For example, the display panel can be a two-dimensional code graph, and the two-dimensional code graph can contain both square elements and line elements, so that the actual use condition of the display panel can be effectively reflected. And the black and white juncture of the two-dimensional code image is more, and the preset two-dimensional code information can be identified as long as the residual shadow does not disappear, so that the error caused by visual evaluation is avoided.
In some optional embodiments, in step 200, the second frame 20 includes an image with a third grayscale value, and for convenience of testing, the second frame 20 of the display panel to be tested is an image with a single third grayscale value, that is, the second frame 20 is entirely displayed as an image with the third grayscale value.
Wherein, the third gray scale value can be 48-128. Preferably, a value between the first gray scale value and the second gray scale value can be selected as a third gray scale value, so that the first gray scale value and the second gray scale value can be switched to the gray scale value between the first gray scale value and the second gray scale value in the process of gradually disappearing the ghost, and the situation that the third gray scale value is close to one of the first gray scale value and the second gray scale value is avoided, in the switching process, a subunit of one gray scale value is switched to a gray scale image, and a subunit of the other gray scale value cannot be switched to the gray scale image, so that the detection accuracy is influenced.
In some embodiments, please refer to fig. 5, step 300 may specifically include the following steps:
step 301, adjusting the position of the image collector to make the image collector face the light-emitting surface of the display panel to be detected. In this step, the image collector faces the light-emitting surface of the display panel to be detected, that is, the image collector faces the second picture 20 displayed by the display panel to be detected, so that it can be ensured that the collected image is not inclined, and the subsequent image processing is facilitated.
Step 302, the display panel to be detected is continuously photographed at regular time by using an image collector to obtain an original image. In this step, the original image includes some other background images, such as a frame image of the display panel and an environment image of an environment where the display panel is located, in addition to the second frame 20.
Step 303, cropping the original image to obtain a detection image. In this step, the original image is cropped, for example, by an imcrop cropping function of MATLAB software, to remove background images that are not related to the detected image.
In other alternative embodiments, please refer to fig. 6, step 300 may specifically include the following steps:
and 310, continuously photographing the display panel to be detected by utilizing an image collector at regular time to obtain an original image. In this step, the original image includes some other background images, such as a frame image of the display panel and an environment image of an environment where the display panel is located, in addition to the second frame 20.
And step 320, performing inclination correction on the original image. In this step, the processing can be specifically performed through a Houghting rectification function of MATLAB software, so as to facilitate the processing of subsequent images.
In step 330, the tilt-corrected image is cropped to obtain a detected image. In this step, the skew-corrected image is cropped, for example, by an imcrop function of MATLAB software, to remove background images that are not related to the detected image.
The image collector of the above embodiment may include a camera, and in some optional embodiments, the resolution of the camera is greater than the resolution of the display panel to be detected, so as to ensure the collection effect of the detection image. Illustratively, the resolution of the camera is greater than or equal to 3 times the resolution of the display panel to be detected.
The image collector of the above embodiment may be a camera, and the camera is used to collect the image of the second frame 20 to obtain the detection image, and the exposure time for photographing by the camera is less than the interval time between two adjacent detection images. To avoid affecting the acquisition efficiency. Illustratively, the exposure time may be less than 1 second.
In some optional embodiments, please refer to fig. 7, step 400 may specifically include the following steps:
step 410, identifying the detection image to obtain image information of the detection image. In this step, the detection image may be recognized by a recognition device, for example, to acquire image information of the detection image.
Step 420, comparing the image information of the detected image with the preset identification code information to determine the last detected image containing the preset identification code information in the image acquisition time sequence. It can be understood that, in the acquired detection image 30, before the afterimage disappears, the identified image information is consistent with the preset identification code information; if the afterimage disappears and the detection image 30 is identified, the preset identification code information cannot be acquired. In the acquisition timing, the last inspection image 30 containing the preset identification code information may be determined.
And 430, determining the residual image disappearance time of the display panel to be detected according to the timestamp of the last detection image containing the preset identification code information. Since the plurality of detection images 30 acquired in step 300 have their corresponding time stamps, since the last detection image 30 including the preset identification code information can be determined in step 420 and the time stamp of the detection image 30 can be acquired, the detection image 30 after the detection image 30 does not include the preset identification code information any more, and the time length corresponding to the time stamp can be used as the afterimage disappearance time.
In some optional embodiments, in step 410, identifying the detection image to obtain image information of the detection image may specifically include: processing the detection image to increase the contrast of the detection image; and identifying the processed image to obtain the image information of the detected image.
In this embodiment, optical enhancement and/or computer enhancement processing methods may be used, for example, an edge enhancement method, a ratio enhancement method, and the like may be used for optical enhancement, and for example, a contrast enhancement method, a spatial filtering method, and the like may be used for computer enhancement. By enhancing the detection image 30, the problem that the acquired detection image is poor in effect due to reasons such as illumination environment or object surface reflection, and the like, so that the image recognition effect is influenced, and the judgment of the residual image disappearance time is influenced finally can be avoided.
In the above embodiment, the steps of acquiring and identifying the detection image 30 may be performed separately, that is, after the acquisition and acquisition of a plurality of detection images are completed, the step of identifying the detection image 30 is performed. And the efficiency of image acquisition, acquisition and recognition can be improved without switching equipment.
In the above embodiment, the steps of acquiring and recognizing the detection images 30 may be performed alternately, that is, the recognition of the number of the detection images 30 may be performed after acquiring and acquiring a preset number of the detection images 30, for example, the recognition of the number of the detection images 30 may be performed after acquiring and acquiring 5 detection images 30. Preferably, each acquisition of a test image 30 is performed, i.e., image recognition is performed. The collection and identification of excessive invalid detection images 30 can be avoided, and the last detection image 30 containing the preset identification code information can be identified in time.
The invention also provides a display panel residual image detection device, which corresponds to the display panel residual image detection method of the embodiment. Referring to fig. 8, fig. 8 is a schematic structural diagram illustrating a display panel image sticking detection apparatus according to an embodiment of the invention. The display panel afterimage detection apparatus 800 of the present embodiment includes a control module 810, a switching module 820, an obtaining module 830, and a determining module 840.
The display module 810 is configured to control the display panel to be detected to display a first picture, wherein the first picture includes an image having a first gray scale value and a second gray scale value of preset identification code information.
The switching module 820 is configured to switch the first frame to a second frame, wherein the second frame includes an image with a third gray scale value, and the third gray scale value is between the first gray scale value and the second gray scale value.
And an acquiring module 830 configured to acquire the plurality of detection images by using the image acquirer to acquire the second frame in a timed and continuous manner.
A determining module 840 configured to determine a last detected image containing the preset identification code information within the image acquisition time sequence to determine the afterimage disappearance time.
In this embodiment, the control module 810 controls the display panel to be detected to display a first picture, where the first picture includes an image with a first gray scale value and a second gray scale value of identification code information, the switching module 820 switches the first picture 10 to a second picture 20 including an image with a third gray scale value, the obtaining module 830 uses an image collector to continuously collect the second picture 20 at regular time to obtain a plurality of detection images 30, and the determining module 840 determines the last detection image 30 including preset identification code information in an image collection time sequence to determine the ghost disappearance time of the display panel to be detected. The residual shadow disappearance time of the display panel can be objectively and accurately evaluated, and a reliable basis is provided for quality evaluation of the display panel.
In some optional embodiments, the determining module 840 is further configured to: identifying the detection image to obtain image information of the detection image; comparing the image information of the detected image with the preset identification code information to determine the last detected image containing the preset identification code information in the image acquisition time sequence; and determining the residual image disappearance time of the display panel to be detected according to the time stamp of the last detection image containing the preset identification code information.
In some optional embodiments, the determining module 840 is further configured to: performing image processing on the detection image to increase the contrast of the detection image; and identifying the processed detection image to obtain the image information of the detection image.
In some optional embodiments, the obtaining module 830 is further configured to: adjusting the position of the image collector to enable a camera of the image collector to be over against the light-emitting surface of the display panel to be detected; continuously photographing a display panel to be detected at regular time by using an image collector to obtain an original image; the original image is cropped to obtain a detection image.
In some optional embodiments, the obtaining module 830 is further configured to: continuously photographing a display panel to be detected at regular time by using an image collector to obtain an original image; performing tilt correction on the original image; the tilt-corrected image is cropped to acquire a detection image.
In some optional embodiments, the image collector comprises a camera, and the resolution of the camera is greater than that of the display panel to be detected; preferably, the resolution of the camera of the image collector is greater than or equal to 3 times of the resolution of the display panel to be detected.
In some optional embodiments, the image collector is a camera, and the exposure time for taking a picture by the camera is less than the interval time for collecting two adjacent detection images; preferably, the exposure time is less than 1 second.
In some alternative embodiments, the first gray scale value is 255, the second gray scale value is 0, and the third gray scale value is 48-128.
In some alternative embodiments, the control module 810 controls the display panel to be detected to display the first picture for a predetermined time. Preferably, the predetermined period of time is 1 minute to 10 minutes.
Since the embodiment of the display panel ghost detection apparatus corresponds to the embodiment of the display panel ghost detection method, the display panel ghost detection apparatus has the beneficial effects of the display panel ghost detection method of the embodiment, and details are not repeated herein.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (13)

1. A method for detecting a residual image of a display panel is characterized by comprising the following steps:
controlling a display panel to be detected to display a first picture, wherein the first picture comprises images of a first gray value and a second gray value which have preset identification code information, and identification codes in the preset identification code information comprise two-dimensional codes or bar codes;
switching the first picture into a second picture, wherein the second picture comprises an image with a third gray scale value, and the third gray scale value is positioned between the first gray scale value and the second gray scale value;
utilizing an image collector to continuously collect the second picture at regular time to obtain a plurality of detection images;
determining the last detection image containing the preset identification code information in an image acquisition time sequence so as to determine the residual image disappearance time of the display panel to be detected;
the determining of the last detection image containing the preset identification code information in the image acquisition time sequence to determine the residual image disappearance time of the display panel to be detected includes:
identifying the detection image through identification equipment to obtain image information of the detection image;
comparing the image information of the detection image with the preset identification code information to determine the last detection image containing the preset identification code information in an image acquisition time sequence;
before the residual image disappears, the identified image information is consistent with the preset identification code information; and if the residual image disappears, identifying the detection image, and then failing to acquire the preset identification code information.
2. The method as claimed in claim 1, wherein the determining a last detected image containing the preset identification code information in an image capturing sequence to determine the disappearance time of the afterimage of the display panel to be detected further comprises:
and determining the residual image disappearance time of the display panel to be detected according to the timestamp of the last detection image containing the preset identification code information.
3. The method for detecting the afterimage of the display panel according to claim 1, wherein the identifying the detected image by the identification device to obtain the image information of the detected image comprises:
performing image processing on the detection image to increase the contrast of the detection image;
and identifying the processed detection image to obtain the image information of the detection image.
4. The method for detecting the afterimage of the display panel according to claim 1, wherein the continuously capturing the second image by the image capturing device at regular time to obtain a plurality of detection images includes:
adjusting the position of an image collector to enable the image collector to be opposite to the light-emitting surface of the display panel to be detected;
continuously photographing the display panel to be detected at regular time by using the image collector to obtain an original image;
and cutting the original image to obtain a detection image.
5. The method for detecting the afterimage of the display panel according to claim 1, wherein said continuously capturing the second image by the image capturing device at regular time to obtain a plurality of detection images comprises:
continuously photographing the display panel to be detected at regular time by using an image collector to obtain an original image;
performing tilt correction on the original image;
the tilt-corrected image is cropped to acquire a detection image.
6. The method for detecting the afterimage of the display panel according to claim 4 or 5, wherein the image collector comprises a camera, and the resolution of the camera is greater than that of the display panel to be detected.
7. The method according to claim 6, wherein the resolution of the camera is greater than or equal to 3 times the resolution of the display panel to be detected.
8. The method for detecting the afterimage of the display panel according to claim 4 or 5, wherein the image collector is a camera, and an exposure time of the camera is shorter than an interval time between two adjacent detection images.
9. The method according to claim 8, wherein the exposure time is less than 1 second.
10. The method of claim 1, wherein the first gray scale value is 255, the second gray scale value is 0, and the third gray scale value is 48-128.
11. The method according to claim 1, wherein in the step of controlling the display panel to be detected to display the first image, the first image is displayed for a predetermined time.
12. The method according to claim 11, wherein the predetermined time period is 1 to 10 minutes.
13. A display panel ghost detection device, characterized by, includes:
the control module is configured to control the display panel to be detected to display a first picture, wherein the first picture comprises an image with a first gray scale value and a second gray scale value of preset identification code information, and an identification code in the preset identification code information comprises a two-dimensional code or a bar code;
a switching module configured to switch the first picture to a second picture, wherein the second picture includes an image of a third grayscale value, the third grayscale value being between the first grayscale value and the second grayscale value;
the acquisition module is configured to acquire the second picture by utilizing an image acquisition device in a timed and continuous mode so as to acquire a plurality of detection images;
the determining module is configured to determine the last detection image containing the identification code information in an image acquisition time sequence so as to determine the residual shadow disappearance time of the display panel to be detected;
the determination module is specifically configured to: identifying the detection image through identification equipment to obtain image information of the detection image;
comparing the image information of the detection image with the preset identification code information to determine the last detection image containing the preset identification code information in an image acquisition time sequence;
before the residual image disappears, the identified image information is consistent with the preset identification code information; and if the residual image disappears, identifying the detection image, and then failing to acquire the preset identification code information.
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