CN113345356A - Ghost testing method and device and storage medium - Google Patents
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Abstract
The embodiment of the invention relates to the technical field of display panel testing, and discloses a residual image testing method which comprises the steps of respectively obtaining residual image testing parameter values of a display panel to be tested under pure color pictures of at least two colors, and determining a residual image evaluation value according to the residual image testing parameter values under the pure color pictures of different colors, wherein the residual image evaluation value is used for representing the residual image degree of the display panel. The method, the device and the storage medium for testing the residual image provided by the invention provide a method for testing the objective quantification of the residual image, and the difference of the sensitivity of human eyes to different colors is comprehensively considered, so that the residual image testing result is more accurate.
Description
Technical Field
The embodiment of the invention relates to the technical field of display panel testing, in particular to a method and a device for testing a residual image and a storage medium.
Background
The afterimage phenomenon of the display panel is a phenomenon that an image or a contour of a previous static picture still appears when the display panel displays a next picture after the display panel displays the previous static picture for a period of time. The display panel with serious image sticking phenomenon has poor display effect. Therefore, the residual image test on the residual image level of the display panel has important significance for improving the production yield of the display panel.
The residual image level of the display panel can be judged by artificially observing the time required by the residual image disappearance of the display panel. However, different people have different sensitivity degrees to the residual image, which easily causes inconsistency of the final judgment result. In view of the above, in the prior art, various methods for objectively and quantitatively testing the afterimage are provided, but the evaluation is performed from the aspect of white picture display difference, and the difference of human eyes in sensitivity to different colors is ignored, so that the afterimage evaluation judgment result is not accurate.
Disclosure of Invention
The invention aims to provide a residual image testing method, a residual image testing device and a storage medium, provides a residual image objective quantification testing method, and comprehensively considers the difference of human eyes in different color sensitivity degrees, so that a residual image testing result is more accurate.
In order to solve the above technical problem, an embodiment of the present invention provides a ghost testing method, including:
respectively acquiring residual image test parameter values of the display panel to be tested under pure color pictures of at least two colors, and determining a residual image evaluation value according to the residual image test parameter values under the pure color pictures of different colors, wherein the residual image evaluation value is used for representing the residual image degree of the display panel;
the method for obtaining the residual image test parameter value of the display panel to be tested under any color pure color picture of the display panel to be tested comprises the following steps:
when the display panel to be detected displays an initial display picture, acquiring initial display parameters of a first area and a second area which are adjacently arranged in the display panel to be detected, wherein the first area and the second area in the initial display picture are in a first gray scale;
acquiring first display parameters of the first area and the second area after the display panel to be tested is switched from an initial display picture to a first display picture for a preset time and then is switched back to the initial display picture, wherein the first area in the first display picture is at a second gray scale, the second area is at a third gray scale, and the first gray scale is larger than the second gray scale and smaller than the third gray scale;
and determining the residual image test parameter value according to the initial display parameter and the first display parameter.
In addition, the ghost test parameter values include: luminance difference and color difference; the initial display parameters include: an initial luminance value and an initial color coordinate; the first display parameter includes: a first luminance value and a first color coordinate; the determining the value of the ghost test parameter according to the initial display parameter and the first display parameter comprises: calculating a brightness difference according to the initial brightness value and the first brightness value; and calculating a color difference according to the initial color coordinate and the first color coordinate, wherein the color difference represents the distance between the initial color coordinate and the first color coordinate.
In addition, the color difference Δ u 'v' is calculated by the following formula:
Δu'v'＝{[(u'A(t)-u'B(t))2+(v'A(t)-v'B(t))2]-[(u'A(0)-u'B(0))2+(v'A(0)-v'B(0))2]}/m
wherein u'A(0) Is the abscissa, v ', of the initial color coordinates of the first region'A(0) Is the ordinate of the initial color coordinate of the first area; u'B(0) Is the abscissa, v ', of the initial color coordinate of the second region'B(0) The ordinate of the initial color coordinate of the second area; u'A(t) is the abscissa of the initial color coordinate of the first region, v'A(t) is the ordinate of the initial color coordinate of the first region; u'B(t) is the abscissa, v ', of the initial color coordinates of the second region'B(t) is the ordinate of the initial color coordinate of the second region, and m is the minimum unit for measuring color difference.
In addition, the luminance difference Δ L is calculated by the following formula:
wherein, L (0)AIs the initial luminance value of the first region, L (0)BIs the initial brightness value of the second area; l (t)AIs the initial luminance value of the second region, L (t)BIs the initial luminance value of the second region.
In addition, the determining the residual image evaluation value according to the residual image test parameter values under the pure color pictures with different colors includes: determining a residual image evaluation value according to the residual image test parameter values under the pure color pictures with different colors and preset weight values of the residual image test parameter values under the pure color pictures with different colors, wherein the shorter the wavelength corresponding to a certain color is, the larger the weight value of the residual image test parameter value under the pure color picture corresponding to the color is.
Additionally, the test parameter values include: luminance difference and color difference; the shorter the wavelength corresponding to the color is, the larger the weight value of the color difference under the pure color picture corresponding to the color is, and the negative color difference is the weight value of the brightness difference under the pure color picture of the same color.
Additionally, the at least two colors include: any two of red, green, blue.
In addition, the first gray scale is L48, the second gray scale is L0, and the third gray scale is L255.
The embodiment of the invention also provides a residual image testing device, which comprises: the parameter acquisition module is used for respectively acquiring initial display parameters and first display parameters of the display panel to be detected under the pure color pictures of at least two colors; specifically, the parameter obtaining module is configured to obtain, when the display panel to be tested displays an initial display screen in a pure color screen of each color, initial display parameters of a first area and a second area that are adjacently disposed in the display panel to be tested, where the first area and the second area in the initial display screen are in a first gray scale; the display panel to be detected is used for acquiring first display parameters of the first area and the second area after the display panel to be detected is switched from an initial display picture to a first display picture for a preset time length under a pure color picture of each color and then is switched back to the initial display picture, wherein the first area in the first display picture is in a second gray scale, the second area is in a third gray scale, and the first gray scale is larger than the second gray scale and smaller than the third gray scale;
and the processing module is connected with the parameter acquisition module and is used for acquiring the initial display parameters and the first display parameters under the pure color pictures with different colors from the parameter acquisition module, determining the residual image test parameter values of the display panel to be tested under the pure color pictures with different colors according to the initial display parameters and the first display parameters, and determining the residual image evaluation values according to the obtained residual image test parameter values under the pure color pictures with different colors.
In addition, the parameter acquisition module includes: the control switching submodule and the data acquisition submodule;
the control switching submodule is used for connecting a display panel to be tested and controlling the display panel to be tested to execute switching operation under at least two pure color pictures with different colors: the switching operation includes: controlling a display panel to be tested to display an initial display picture under the pure color picture of each color; then, controlling the display panel to be tested to switch from the initial display picture to the first display picture for a preset time and then switching back to the initial display picture;
the data acquisition submodule is used for acquiring the initial display parameters when the control switching submodule controls the display panel to be tested to display the initial display picture, and acquiring the first display parameters when the control switching submodule controls the display panel to be tested to switch from the initial display picture to the first display picture for a preset time and then to switch back to the initial display picture, so as to acquire the initial display parameters and the first display parameters under at least two pure color pictures with different colors.
The embodiment of the invention provides a residual image testing method, and compared with the prior art that the residual image level of a display panel is judged by artificially observing the time length required by the disappearance of the residual image of the display panel, the residual image objective quantification testing method is provided in the embodiment, residual image testing parameter values of the display panel to be tested under pure color pictures of at least two colors are respectively obtained, and a residual image evaluation value is determined according to the residual image testing parameter values under the pure color pictures of different colors, and is used for representing the residual image degree of the display panel to be tested. Compared with the prior art that the ghost image test is performed only according to the white picture display difference, in the embodiment, the difference of the sensitivity degrees of human eyes to different colors is comprehensively considered, and the ghost image evaluation value is determined by combining at least the ghost image test parameter values of the display panel to be tested under the pure color pictures with two colors, so that the ghost image test result obtained according to the ghost image evaluation value is more accurate.
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One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
FIG. 1 is a flow chart illustrating a method for testing image sticking according to a first embodiment of the present invention;
fig. 2 is a detailed flowchart of step S1 in fig. 1 according to the first embodiment of the present invention;
FIG. 3 is a diagram illustrating the switching of the display interface of the display panel under test under the red pure color frame according to the first embodiment of the present invention;
FIG. 4 is a diagram illustrating the switching of the display interface of the display panel under test under the green pure color frame according to the first embodiment of the present invention;
FIG. 5 is a diagram illustrating the switching of the display interface of the display panel under test under the blue pure-color frame according to the first embodiment of the present invention;
FIG. 6 is a schematic structural diagram of an afterimage testing apparatus according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
The first embodiment of the present invention relates to a residual image testing method, and the core of the present embodiment provides a residual image testing method, in which, compared with the prior art in which the residual image level of a display panel is determined by artificially observing the time required for the residual image disappearance of the display panel, the present embodiment provides a residual image objective quantification testing method, which respectively obtains residual image testing parameter values of the display panel to be tested in at least two pure color pictures, and determines a residual image evaluation value according to the residual image testing parameter values in the pure color pictures of different colors, where the residual image evaluation value is used to represent the residual image degree of the display panel to be tested. Compared with the prior art that the ghost image test is performed only according to the white picture display difference, in the embodiment, the difference of the sensitivity degrees of human eyes to different colors is comprehensively considered, and the ghost image evaluation value is determined by combining at least the ghost image test parameter values of the display panel to be tested under the pure color pictures with two colors, so that the ghost image test result obtained according to the ghost image evaluation value is more accurate.
The following describes the details of the embodiment of the afterimage testing method, and the following description is only provided for the convenience of understanding and is not essential to the implementation of the present invention.
The flow diagram of the ghost testing method in this embodiment is shown in fig. 1:
step S1: and respectively acquiring residual image test parameter values of the display panel to be tested under the pure color pictures with at least two colors.
Step S2: and determining a residual image evaluation value according to residual image test parameter values under the pure color pictures with different colors, wherein the residual image evaluation value is used for representing the residual image degree of the display panel.
Specifically, compared with the prior art in which the afterimage test is performed only according to the white picture display difference, in this embodiment, the difference of the sensitivity of human eyes to different colors is comprehensively considered, and the afterimage test parameter value of the display panel to be tested under the pure color picture of at least two colors is at least obtained, so that the afterimage evaluation value is determined jointly according to the afterimage test parameter value of the display panel to be tested under the pure color picture of at least two colors, and the afterimage test result obtained according to the afterimage evaluation value is more accurate.
In this embodiment, the residual image test parameter values of the display panel to be tested under the pure color picture of at least two colors are obtained, where the at least two colors include: any two of red, green, blue, for example: red and green; green and blue; blue and red. In practical application, in order to ensure that the image sticking test result is more accurate, the image sticking test parameter values of the display panel to be tested under the pure color picture with three or more colors can be adopted. Since the three primary colors for the composite color white include: the method has the advantages that the method can be used for disassembling and testing the white residual images of the composite color, residual image testing parameter values of the display panel to be tested under the pure color pictures of the red color, the green color and the blue color are obtained respectively, the difference of human eyes in different color sensitivity degrees can be considered comprehensively, and accordingly, a more accurate residual image testing result can be obtained.
In this embodiment, the process of obtaining the residual image test parameter value of the display panel to be tested in step S1 under the pure color picture of any color is shown in steps S11 to S13 in fig. 2, and is described in detail with reference to fig. 3 to 4:
step S11: when the display panel to be detected displays an initial display picture, initial display parameters of a first area A and a second area B which are adjacently arranged in the display panel to be detected are obtained, and the first area A and the second area B in the initial display picture are in a first gray scale.
Specifically, the display panel to be tested includes a first area a and a second area B which are adjacently arranged, and the adjacent arrangement of the first area a and the second area B in the left and right in the drawing is only an example, and the first area a and the second area B may also be arranged up and down in practical application, and the embodiment is not specifically limited in this embodiment. When the display panel to be tested displays an initial display picture, the display colors of the first area A and the second area B are the same, the first area A and the second area B are both in a first gray scale, and initial display parameters of the first area A and the second area B are respectively obtained, wherein the initial display parameters can be brightness or color coordinates and the like.
Step S12: the method comprises the steps of obtaining first display parameters of a first area A and a second area B after a display panel to be tested is switched from an initial display picture to a first display picture for a preset time and then is switched back to the initial display picture, wherein the first area A is in a second gray scale and the second area B is in a third gray scale in the first display picture, and the first gray scale is larger than the second gray scale and smaller than the third gray scale.
Specifically, after the initial display parameters of the first area A and the second area B in the initial display picture displayed by the display panel to be tested are obtained, the color of the display panel to be tested is kept unchanged, the gray scale of the first area A of the display panel to be tested is reduced to the second gray scale, and the gray scale of the second area B is increased to the third gray scale, so that the display panel to be tested displays the first display picture. After maintaining the display panel to be tested in the first display picture for a preset time, switching the display panel to be tested back to the initial display picture, and then obtaining first display parameters of a first area A and a second area B in the display panel to be tested, wherein the first display parameters can be brightness or color coordinates and the like. However, it should be noted that the first display parameter needs to be the same as the initial display parameter, and when the initial display parameter is the brightness, the first display parameter is also the brightness; when the initial display parameter is a color coordinate, the first display parameter is also a color coordinate.
As shown in fig. 3 to 5, the schematic diagrams of the switching of the display interface of the display panel to be tested under the pure color picture of three colors of red, green and blue are shown. Fig. 3 is a schematic diagram illustrating switching of a display interface of a display panel to be tested in a red pure color picture, wherein the larger the line density is, the larger the gray scale of the region is; fig. 4 is a schematic diagram showing switching of a display interface of a display panel to be tested in a green pure color picture, wherein the larger the line density is, the larger the gray scale of the region is; fig. 5 is a schematic diagram illustrating switching of display interfaces of a display panel to be tested in a blue pure color frame, wherein the larger the density of the grid is, the larger the gray scale of the area is.
Alternatively, the first gray level is L48, the second gray level is L0, and the third gray level is L255. In other examples, the first gray level may be L127 or L128, etc.
Optionally, the preset time period is, for example, 10 seconds. The embodiment is not particularly limited, and is favorable for the ghost test result.
Step S13: and determining a residual image test parameter value according to the initial display parameter and the first display parameter.
The first display parameter is data obtained after the first display picture is switched back to the initial display picture, so that the first display parameter can be seen by comparing the first display parameter with the initial display parameter, and after the gray scale of the display picture is changed to the high and low directions and is switched back, the display parameter of the display panel to be tested is changed, and the parameter representing the degree of change of the display parameter of the display panel to be tested is the afterimage test parameter value.
According to the first display parameter and the initial display parameter, when the first display parameter and the initial display parameter are brightness, the ghost test parameter is brightness difference; and when the first display parameter and the initial display parameter are color coordinates, the residual image testing parameter is color difference.
Since the human eye feels any display as a result of the joint action of the luminance and the chrominance, in some examples, in addition to the luminance, the residual image test method also adds a chrominance test, and the residual image evaluation value comprehensively considers the difference between the luminance and the chrominance, so that the obtained residual image evaluation value can more accurately feed back the subjective feeling of the human eye.
The ghost test parameter values include: luminance difference and color difference; the initial display parameters include: an initial luminance value and an initial color coordinate; the first display parameter includes: a first luminance value and a first color coordinate; determining a value of a ghost test parameter according to the initial display parameter and the first display parameter comprises: calculating a brightness difference according to the initial brightness value and the first brightness value; and calculating a color difference according to the initial color coordinate and the first color coordinate, wherein the color difference represents the distance between the initial color coordinate and the first color coordinate.
Specifically, the color coordinates are represented as (u ', v'). The color difference Δ u 'v' is calculated by the following formula (1):
Δu'v'＝{[(u'A(t)-u'B(t))2+(v'A(t)-v'B(t))2]-[(u'A(0)-u'B(0))2+(v'A(0)-v'B(0))2]}/m (1)
wherein u'A(0) Is the abscissa, v ', of the initial color coordinates of the first region A'A(0) Is the ordinate of the initial color coordinate of the first area A; u'B(0) Is the abscissa, v ', of the initial color coordinate of the second region B'B(0) Is the ordinate of the initial color coordinate of the second area B; u'A(t) is the abscissa of the initial color coordinate of the first area A,v'A(t) is the ordinate of the initial color coordinate of the first area a; u'B(t) is the abscissa, v ', of the initial color coordinates of the second region B'B(t) is the ordinate of the initial color coordinate of the second area B, and m is the minimum unit for measuring color difference. Wherein m may be 0.004.
Optionally, when a CIE1976-LAB color difference formula more consistent with the human eye color visual discrimination characteristics is adopted, the color coordinate is represented as (L, a, b), and the color difference Δ c represents the distance between the initial color coordinate and the first color coordinate, which is not described in detail in this embodiment.
Specifically, the luminance is represented by L, and the luminance difference Δ L is calculated by the following formula (2):
wherein, L (0)AIs the initial luminance value of the first region A, L (0)BIs the initial brightness value of the second area B; l (t)AIs the initial luminance value of the second region B, L (t)BIs the initial luminance value of the second region B.
In step S2, after obtaining the residual image test parameter values under the pure color pictures with different colors, the process of determining the residual image evaluation value according to the residual image test parameter values under the pure color pictures with different colors is specifically as follows:
determining a residual shadow evaluation value according to residual shadow test parameter values under different color pure color pictures, comprising the following steps: determining a residual image evaluation value according to residual image test parameter values under different color pure color pictures and preset weight values of the residual image test parameter values under different color pure color pictures, wherein the shorter the wavelength corresponding to a certain color is, the larger the weight value of the residual image test parameter value under the pure color picture corresponding to the color is.
Specifically, the shorter the wavelength corresponding to a certain color is, the higher the sensitivity of human eyes to the color is, the strongest the sensitivity of human eyes to blue is, the second order of green is, and the lowest red is. Therefore, different weight values can be given according to different sensitivity degrees of human eyes to different colors, namely the shorter the wavelength corresponding to a certain color is, the larger the weight value of the residual image test parameter value under the pure color picture corresponding to the color is, so that the acquired residual image evaluation value can more accurately represent the residual image degree of the display panel.
In some examples, the test parameter values include: according to the existing research, human eyes have different sensitivity degrees to different color differences according to the brightness difference and the color difference, so that the shorter the wavelength corresponding to the color is, the larger the weight value of the color difference under the pure color picture corresponding to the color is, for example: and a blue color difference weighting coefficient a1, a green color difference weighting coefficient b1 and a red color difference weighting coefficient c1 are given, and a1 > b1 > c 1. And the higher the brightness, the less sensitive the human eye to the change of chromaticity, so the weighted value of the brightness difference under the same color pure color picture is the color difference of negative multiple, for example: the blue luminance difference weighting coefficient a2, the green luminance difference weighting coefficient b2 and the red luminance difference weighting coefficient c2 are given, wherein a2 is-k 1 a1, b2 is-k 2 b1, and c2 is-k 3 c1, wherein k1, k2 and k3 are coefficients which can be set by a user according to actual needs.
The following specifically describes the residual image evaluation value by respectively obtaining residual image test parameter values of the display panel to be tested under the pure color picture of three colors (red, green and blue), and the residual image test parameter values including luminance difference and color difference:
residual image test parameter values of a display panel to be tested under a red pure color picture, wherein the brightness difference is delta L _ r, and the color difference is delta u 'v' _ r; residual image test parameter values of the display panel to be tested under the green pure color picture, wherein the brightness difference is delta L _ g, and the color difference is delta u 'v' _ g; and (3) residual image test parameter values of the display panel to be tested under the blue pure color picture, wherein the brightness difference is delta L _ b, and the color difference is delta u 'v' _ b.
The afterimage evaluation value JND obtained according to the above-described weighting coefficient assignment method can be calculated by the following equation (3):
JND＝a1*Δu'v'_r+a2*ΔL_r+b1*Δu'v'_g+b2*ΔL_g+c1*Δu'v'_b+c2*ΔL_b(3)
compared with the related art, in the embodiment of the invention, compared with the prior art that the residual image level of the display panel is judged by artificially observing the time required by the residual image disappearance of the display panel, the residual image objective quantification test method is provided in the embodiment, the residual image test parameter values of the display panel to be tested under the pure color pictures of at least two colors are respectively obtained, the residual image evaluation value is determined according to the residual image test parameter values under the pure color pictures of different colors, and the residual image evaluation value is used for representing the residual image degree of the display panel to be tested. Compared with the prior art that the ghost image test is performed only according to the white picture display difference, in the embodiment, the difference of the sensitivity degrees of human eyes to different colors is comprehensively considered, and the ghost image evaluation value is determined by combining at least the ghost image test parameter values of the display panel to be tested under the pure color pictures with two colors, so that the ghost image test result obtained according to the ghost image evaluation value is more accurate.
The steps of the above methods are divided for clarity, and the implementation may be combined into one step or split some steps, and the steps are divided into multiple steps, so long as the same logical relationship is included, which are all within the protection scope of the present patent; it is within the scope of the patent to add insignificant modifications to the algorithms or processes or to introduce insignificant design changes to the core design without changing the algorithms or processes.
A second embodiment of the present invention relates to a residual image test apparatus, as shown in fig. 6, including:
the parameter acquiring module 31 is configured to acquire an initial display parameter and a first display parameter of a display panel to be detected in a pure color picture of at least two colors, respectively; specifically, the parameter obtaining module 31 is configured to, when the display panel to be detected displays an initial display image under a pure color image of each color, obtain initial display parameters of a first area and a second area that are adjacently arranged in the display panel to be detected, where the first area and the second area in the initial display image are in a first gray scale; the display panel to be detected is used for acquiring first display parameters of a first area and a second area after the display panel to be detected is switched from an initial display picture to a first display picture for a preset time length under a pure color picture of each color and then is switched back to the initial display picture, wherein the first area in the first display picture is in a second gray scale, the second area is in a third gray scale, and the first gray scale is larger than the second gray scale and smaller than the third gray scale;
the processing module 32 is connected to the parameter acquiring module 31, and the processing module 32 is configured to acquire the initial display parameter and the first display parameter in the pure color picture with different colors from the parameter acquiring module 31, determine a residual image test parameter value of the display panel to be tested in the pure color picture with different colors according to the initial display parameter and the first display parameter, and determine a residual image evaluation value according to the obtained residual image test parameter value in the pure color picture with different colors.
Specifically, compared with the prior art in which the afterimage test is performed only according to the white picture display difference, in this embodiment, the difference of the sensitivity of human eyes to different colors is comprehensively considered, and the afterimage test parameter value of the display panel to be tested under the pure color picture of at least two colors is at least obtained, so that the afterimage evaluation value is determined jointly according to the afterimage test parameter value of the display panel to be tested under the pure color picture of at least two colors, and the afterimage test result obtained according to the afterimage evaluation value is more accurate.
In this embodiment, the residual image test parameter values of the display panel to be tested under the pure color picture of at least two colors are obtained, where the at least two colors include: any two of red, green, blue, for example: red and green; green and blue; blue and red. In practical application, in order to ensure that the image sticking test result is more accurate, the image sticking test parameter values of the display panel to be tested under the pure color picture with three or more colors can be adopted. Since the three primary colors for the composite color white include: the method has the advantages that the method can be used for disassembling and testing the white residual images of the composite color, residual image testing parameter values of the display panel to be tested under the pure color pictures of the red color, the green color and the blue color are obtained respectively, the difference of human eyes in different color sensitivity degrees can be considered comprehensively, and accordingly, a more accurate residual image testing result can be obtained.
In some examples, the parameter obtaining module 31 includes: a control switching sub-module 311 and a data acquisition sub-module 312; the control switching sub-module 311 is configured to connect to a display panel to be tested, and control the display panel to be tested to perform switching operation under at least two pure color pictures of different colors: the switching operation includes: controlling a display panel to be tested to display an initial display picture under the pure color picture of each color; and then, controlling the display panel to be tested to switch from the initial display picture to the first display picture for a preset time and then switching back to the initial display picture.
The data acquisition submodule 312 is configured to obtain an initial display parameter when the control switching submodule 311 controls the display panel to be tested to display the initial display screen, and obtain a first display parameter when the control switching submodule 311 controls the display panel to be tested to switch from the initial display screen to the first display screen for a preset time period and then to switch back to the initial display screen, so as to obtain the initial display parameter and the first display parameter under the pure color pictures of at least two different colors.
The residual image testing apparatus in this embodiment is an embodiment of an apparatus corresponding to the residual image testing method in the first embodiment, and therefore, implementation details in the first embodiment may be applied to this embodiment, and implementation details in this embodiment may also be applied to this embodiment in practical application, and are not described herein again.
The third embodiment of the present invention also provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the computer program implements the ghost testing method.
That is, as can be understood by those skilled in the art, all or part of the steps in the method for implementing the embodiments described above may be implemented by a program instructing related hardware, where the program is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (10)
1. A ghost testing method is characterized by comprising the following steps:
respectively acquiring residual image test parameter values of the display panel to be tested under pure color pictures of at least two colors, and determining a residual image evaluation value according to the residual image test parameter values under the pure color pictures of different colors, wherein the residual image evaluation value is used for representing the residual image degree of the display panel;
the method for obtaining the residual image test parameter value of the display panel to be tested under any color pure color picture of the display panel to be tested comprises the following steps:
when the display panel to be detected displays an initial display picture, acquiring initial display parameters of a first area and a second area which are adjacently arranged in the display panel to be detected, wherein the first area and the second area in the initial display picture are in a first gray scale;
acquiring first display parameters of the first area and the second area after the display panel to be tested is switched from an initial display picture to a first display picture for a preset time and then is switched back to the initial display picture, wherein the first area in the first display picture is at a second gray scale, the second area is at a third gray scale, and the first gray scale is larger than the second gray scale and smaller than the third gray scale;
and determining the residual image test parameter value according to the initial display parameter and the first display parameter.
2. The image sticking test method of claim 1, wherein the image sticking test parameter values comprise: luminance difference and color difference; the initial display parameters include: an initial luminance value and an initial color coordinate; the first display parameter includes: a first luminance value and a first color coordinate;
the determining the value of the ghost test parameter according to the initial display parameter and the first display parameter comprises:
calculating a brightness difference according to the initial brightness value and the first brightness value;
and calculating a color difference according to the initial color coordinate and the first color coordinate, wherein the color difference represents the distance between the initial color coordinate and the first color coordinate.
3. The afterimage testing method according to claim 2, wherein said color difference Δ u 'v' is calculated by the following formula:
Δu'v'＝{[(u'A(t)-u'B(t))2+(v'A(t)-v'B(t))2]-[(u'A(0)-u'B(0))2+(v'A(0)-v'B(0))2]}/m
wherein u'A(0) Is the abscissa, v ', of the initial color coordinates of the first region'A(0) Is the ordinate of the initial color coordinate of the first area; u'B(0) Is the abscissa, v ', of the initial color coordinate of the second region'B(0) The ordinate of the initial color coordinate of the second area; u'A(t) is the abscissa of the initial color coordinate of the first region, v'A(t) is the ordinate of the initial color coordinate of the first region; u'B(t) is the abscissa, v ', of the initial color coordinates of the second region'B(t) is the ordinate of the initial color coordinate of the second region, and m is the minimum unit for measuring color difference.
4. The afterimage testing method according to claim 2, wherein said luminance difference Δ L is calculated by the following formula:
wherein, L (0)AIs the initial luminance value of the first region, L (0)BIs the initial brightness value of the second area; l (t)AIs the initial luminance value of the second region, L (t)BIs the initial luminance value of the second region.
5. The method according to claim 1, wherein the determining the residual image evaluation value according to the residual image test parameter values under different color pure color pictures comprises:
determining a residual image evaluation value according to the residual image test parameter values under the pure color pictures with different colors and preset weight values of the residual image test parameter values under the pure color pictures with different colors, wherein the shorter the wavelength corresponding to a certain color is, the larger the weight value of the residual image test parameter value under the pure color picture corresponding to the color is.
6. The image sticking test method of claim 5, wherein the test parameter values comprise: luminance difference and color difference;
the shorter the wavelength corresponding to the color is, the larger the weight value of the color difference under the pure color picture corresponding to the color is, and the negative color difference is the weight value of the brightness difference under the pure color picture of the same color.
7. The method of claim 1, wherein the at least two colors comprise: any two of red, green, blue.
8. The method of claim 1, wherein the first gray level is L48, the second gray level is L0, and the third gray level is L255.
9. An afterimage testing device, comprising:
the parameter acquisition module is used for respectively acquiring initial display parameters and first display parameters of the display panel to be detected under the pure color pictures of at least two colors; specifically, the parameter obtaining module is configured to obtain, when the display panel to be tested displays an initial display screen in a pure color screen of each color, initial display parameters of a first area and a second area that are adjacently disposed in the display panel to be tested, where the first area and the second area in the initial display screen are in a first gray scale; the display panel to be detected is used for acquiring first display parameters of the first area and the second area after the display panel to be detected is switched from an initial display picture to a first display picture for a preset time length under a pure color picture of each color and then is switched back to the initial display picture, wherein the first area in the first display picture is in a second gray scale, the second area is in a third gray scale, and the first gray scale is larger than the second gray scale and smaller than the third gray scale;
and the processing module is connected with the parameter acquisition module and is used for acquiring the initial display parameters and the first display parameters under the pure color pictures with different colors from the parameter acquisition module, determining the residual image test parameter values of the display panel to be tested under the pure color pictures with different colors according to the initial display parameters and the first display parameters, and determining the residual image evaluation values according to the obtained residual image test parameter values under the pure color pictures with different colors.
10. The image sticking test method of claim 9, wherein the parameter obtaining module comprises: the control switching submodule and the data acquisition submodule;
the control switching submodule is used for connecting a display panel to be tested and controlling the display panel to be tested to execute switching operation under at least two pure color pictures with different colors: the switching operation includes: controlling a display panel to be tested to display an initial display picture under the pure color picture of each color; then, controlling the display panel to be tested to switch from the initial display picture to the first display picture for a preset time and then switching back to the initial display picture;
the data acquisition submodule is used for acquiring the initial display parameters when the control switching submodule controls the display panel to be tested to display the initial display picture, and acquiring the first display parameters when the control switching submodule controls the display panel to be tested to switch from the initial display picture to the first display picture for a preset time and then to switch back to the initial display picture, so as to acquire the initial display parameters and the first display parameters under at least two pure color pictures with different colors.
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