WO2024061167A1

WO2024061167A1 - Image-sticking detection method and image-sticking detection apparatus for display panel

Info

Publication number: WO2024061167A1
Application number: PCT/CN2023/119431
Authority: WO
Inventors: 浦超; 张大成; 单庆山; 陈小川; 杨盛际; 杨俊彦; 杨树成; 张明瑞; 屈刘泽明; 王蕾; 王玉玲; 苏琦; 马召; 谢卓洋
Original assignee: 京东方科技集团股份有限公司; 云南创视界光电科技有限公司
Priority date: 2022-09-22
Filing date: 2023-09-18
Publication date: 2024-03-28
Also published as: CN117789620A

Abstract

An image-sticking detection method for a display panel, the method comprising: acquiring first brightness information of a display panel to be subjected to detection after the display panel switches from a first picture to a second picture; determining second brightness information of each display sub-area according to the first brightness information; determining a brightness change parameter between at least one display sub-area and an adjacent display sub-area according to second brightness information of a plurality of display sub-areas; and determining an image-sticking evaluation parameter of the display panel according to the brightness change parameter between the at least one display sub-area and the adjacent display sub-area, wherein the first picture comprises a plurality of first sub-pictures, a display area of the display panel comprises the plurality of display sub-areas corresponding to the plurality of first sub-pictures on a one-to-one basis, the second picture comprises a plurality of second sub-pictures, and the second sub-pictures correspond to a boundary area of at least two adjacent display sub-areas.

Description

Afterimage detection method and afterimage detection device for display panel

This application claims priority to the Chinese patent application submitted to the China Patent Office on September 22, 2022, with the application number 202211160520. Incorporated into this application by reference.

Technical field

This article relates to but is not limited to the field of display technology, and specifically refers to a method and device for detecting afterimages of a display panel.

Background technique

With the rapid development of display technology, people have put forward more stringent requirements for the image quality of display products. Among them, image sticking is the factor that has the greatest impact on image quality and is the most difficult to improve. Afterimage refers to the phenomenon where the display panel displays the same screen for a long time and then switches to another screen, leaving an afterimage of the previous screen on the new screen. In order to ensure the production quality of display products and control costs, afterimage detection has become an indispensable and important part of the production process of display products.

At present, the residual image detection method in the industry mainly adopts the manual visual inspection method, that is, observing the lit display panel with the naked eye and visually comparing it with the residual image level sample, and then judging whether the display panel has defects and determining the corresponding residual image level. However, due to differences in visual perception between people, eye fatigue and other factors, the residual image levels determined by different people are different. Therefore, this manual visual determination of the residual image level cannot accurately and objectively judge the picture quality of the display product.

Contents of the invention

The following is an overview of the topics described in detail in this article. This summary is not intended to limit the scope of the claims.

Embodiments of the present disclosure provide an afterimage detection method and an afterimage detection device for a display panel.

On the one hand, embodiments of the present disclosure provide a method for detecting afterimages of a display panel, including: obtaining first brightness information after the display panel to be detected switches from a first screen to a second screen; and determining, based on the first brightness information, second brightness information of each sub-display area; determining a brightness change parameter between at least one sub-display area and an adjacent sub-display area according to the second brightness information of the plurality of sub-display areas; according to the at least one sub-display area and the brightness change parameter between adjacent sub-display areas to determine the after-image evaluation parameters of the display panel. Wherein, the first picture includes a plurality of first sub-pictures, the display area of the display panel includes a plurality of sub-display areas corresponding to the plurality of first sub-pictures, and the second picture includes a plurality of first sub-pictures. Two sub-pictures, the second sub-picture corresponds to the boundary area of at least two adjacent sub-display areas.

In some exemplary embodiments, determining the afterimage evaluation parameter of the display panel based on the brightness change parameter between the at least one sub-display area and an adjacent sub-display area includes: calculating the determined brightness change parameter The average value is used as the afterimage evaluation parameter.

In some exemplary embodiments, determining a brightness change parameter between at least one sub-display area and an adjacent sub-display area based on the second brightness information of the multiple sub-display areas includes: for one sub-display area, When the gray scale of the first sub-picture corresponding to the sub-display area is smaller than the gray scale of the first sub-picture corresponding to the adjacent sub-display area, calculate the second brightness information of the sub-display area and the adjacent sub-display area. The difference between the second brightness information of the sub-display area, and the ratio between the difference and the second brightness information of the sub-display area is used as the brightness change between the sub-display area and the adjacent sub-display area. parameter; when the gray scale of the first sub-picture corresponding to the sub-display area is greater than the gray scale of the first sub-picture corresponding to the adjacent sub-display area, calculate the second brightness information of the adjacent sub-display area and the The difference between the second brightness information of the sub-display area, and the ratio between the difference and the second brightness information of the adjacent sub-display area is used as the ratio between the sub-display area and the adjacent sub-display area. brightness change parameters between.

In some exemplary embodiments, determining a brightness change parameter between at least one sub-display area and an adjacent sub-display area based on the second brightness information of the multiple sub-display areas includes: for one sub-display area, According to the second brightness information of the sub-display area and the second brightness information of the adjacent sub-display area along the first direction, a first distance between the sub-display area and the adjacent sub-display area along the first direction is determined. Brightness change parameter; determine the difference between the sub-display area and the adjacent sub-display area along the second direction based on the second brightness information of the sub-display area and the second brightness information of the adjacent sub-display area along the second direction. The second brightness change parameter between; wherein the first direction intersects the second direction.

In some exemplary embodiments, the first direction is perpendicular to the second direction.

In some exemplary embodiments, determining the afterimage evaluation parameter of the display panel based on the brightness change parameter between the at least one sub-display area and an adjacent sub-display area includes: calculating the afterimage evaluation according to the following formula parameter:

Wherein, ISP is the afterimage evaluation parameter, n represents the number of sub-display areas along the first direction, m represents the number of sub-display areas along the second direction; m and n are both integers greater than 1; μ is Correction coefficient, and μ is greater than 0; CH(i,j) represents the first brightness change parameter between the sub-display area located in the i-th row and j-th column and the adjacent sub-display area along the first direction, CV(i, j) represents the second brightness change parameter between the sub-display area located in the i-th row and j-th column and the adjacent sub-display area along the second direction.

In some exemplary embodiments, the sub-display area includes at least one light-emitting unit; the first brightness information includes: brightness values of all light-emitting units in the display area.

In some exemplary embodiments, determining the second brightness information of each sub-display area according to the first brightness information includes: removing abnormal brightness values of the sub-display area and calculating the remaining brightness values. The average value is used as the second brightness information of the sub-display area.

In some exemplary embodiments, removing abnormal brightness values in the sub-display area includes: removing brightness values in the sub-display area that do not meet a 3σ criterion.

In some exemplary embodiments, the afterimage detection method further includes: obtaining a brightness curve of the display panel at different viewing angles. After obtaining first brightness information after the display panel switches from the first image to the second image, the afterimage detection method further includes: using the brightness curve to perform brightness calibration on the first brightness information.

In some exemplary embodiments, the first screen is a checkerboard screen, the checkerboard screen includes a plurality of first sub-screens arranged in a matrix, the plurality of first sub-screens include a plurality of first pure color sub-screens and a plurality of second pure color sub-screens, the first pure color sub-screens are pure color sub-screens with a first grayscale, and the second pure color sub-screens are pure color sub-screens with a second grayscale; along the row direction and the column direction of the matrix, the first pure color sub-screens and the second pure color sub-screens are alternately arranged; the first grayscale is different from the second grayscale.

In some exemplary embodiments, the first gray level is 0 gray level, and the second gray level is 255 gray level; or, the first gray level is 255 gray level, and the second gray level is 0 gray level. level.

In some exemplary embodiments, the second picture is a solid color picture having a third gray scale, the third gray scale is different from the first gray scale and the second gray scale, or the third gray scale The level is the same as the first gray level or the second gray level.

In some exemplary embodiments, the third gray level is a 255 gray level.

In some exemplary embodiments, the afterimage detection method further includes: according to a set level comparison table, according to The afterimage evaluation parameter of the display panel determines the afterimage level of the display panel; the level comparison table records the corresponding relationship between the numerical range of the afterimage evaluation parameter and the afterimage level.

In some exemplary embodiments, obtaining the first brightness information after the display panel to be detected switches from the first picture to the second picture includes: when the display panel displays the second picture, Perform a single brightness collection on the entire display area to obtain the first brightness information.

On the other hand, embodiments of the present disclosure provide an afterimage detection device for a display panel, including: an acquisition module and a first processing module. The acquisition module is configured to acquire the first brightness information after the display panel to be detected switches from the first picture to the second picture; wherein the first picture includes a plurality of first sub-pictures, and the display area of the display panel includes and The plurality of first sub-pictures correspond to a plurality of sub-display areas in a one-to-one manner, the second picture includes a plurality of second sub-pictures, and the second sub-pictures correspond to the boundary areas of at least two adjacent sub-display areas. A first processing module configured to determine second brightness information of each sub-display area based on the first brightness information; determine the relationship between at least one sub-display area and adjacent sub-displays based on the second brightness information of the multiple sub-display areas. a brightness change parameter between areas; and determining an afterimage evaluation parameter of the display panel based on a brightness change parameter between the at least one sub-display area and an adjacent sub-display area.

On the other hand, embodiments of the present disclosure provide a non-transitory computer-readable storage medium storing a computer program that, when executed, implements the steps of the after-image detection method for a display panel as described above.

On the other hand, embodiments of the present disclosure provide a method for detecting afterimages of a display panel, which includes: determining whether the requirements for the display are satisfied based on the attribute information of the light-emitting unit in the display area of the display panel to be detected and the collection parameters of the collection device. The one-time whole-surface collection condition of the panel; after the one-time whole-surface collection condition is met and the display panel is switched from the first picture to the second picture, the first brightness information of the display panel is obtained through one collection, so that The first brightness information is used to perform afterimage evaluation.

In some exemplary embodiments, the one-time whole-surface acquisition conditions include:

0.01<ka×Nx/f<0.1; where, k=nx/Nx or k=ny/Ny;

Where, f represents the focal length of the lens, a represents the length of the light-emitting units in the display area along the first direction, Nx represents the number of light-emitting units in the display area along the first direction, and Ny represents the length of the light-emitting units in the display area along the first direction. The number of light-emitting units along the second direction, the first direction is perpendicular to the second direction; nx represents the number of light-emitting units within the effective sampling diameter range along the first direction, and ny represents the number of light-emitting units along the first direction. The number of light-emitting units within the effective sampling diameter range in the second direction.

On the other hand, embodiments of the present disclosure provide an afterimage detection device for a display panel, including: a second processing module and a collection module. The second processing module is configured to determine whether the one-time full-surface collection condition for the display panel is met based on the attribute information of the light-emitting unit of the display area of the display panel to be detected and the collection parameters of the collection device. The collection module is configured to obtain the first brightness information of the display panel through one collection after the one-time full-surface collection condition is met and the display panel switches from the first picture to the second picture, so as to utilize the first Brightness information is used to evaluate afterimages.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

Figure overview

The drawings are used to provide a further understanding of the technical solution of the present disclosure, and constitute a part of the specification. They are used to explain the technical solution of the present disclosure together with the embodiments of the present disclosure, and do not constitute a limitation of the technical solution of the present disclosure. The shape and size of one or more components in the drawings do not reflect true proportions and are intended only to illustrate the present disclosure.

FIG. 1 is a flow chart of a method for detecting afterimages of a display panel according to at least one embodiment of the present disclosure;

Figure 2 is a schematic diagram of a human eye contrast sensitivity function;

Figure 3 is an example flowchart of an afterimage detection method for a display panel according to at least one embodiment of the present disclosure;

Figure 4 is a partial schematic diagram of a first screen according to at least one embodiment of the present disclosure;

FIG. 5 is a partial schematic diagram of an afterimage displayed on a display panel according to at least one embodiment of the present disclosure;

Figure 6 is a schematic diagram of brightness information collection according to at least one embodiment of the present disclosure;

7 is a schematic diagram of brightness curves of a display panel under different viewing angles according to at least one embodiment of the present disclosure;

Figure 8 is a schematic comparison diagram of afterimage detection results according to at least one embodiment of the present disclosure;

FIG. 9 is a schematic diagram of an afterimage detection device of a display panel according to at least one embodiment of the present disclosure;

Figure 10 is a schematic diagram of an afterimage detection system of a display panel according to at least one embodiment of the present disclosure;

Figure 11 is another flowchart of a residual image detection method for a display panel according to at least one embodiment of the present disclosure;

FIG. 12 is another schematic diagram of an afterimage detection device of a display panel according to at least one embodiment of the present disclosure.

Elaborate

The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Embodiments may be implemented in many different forms. Those of ordinary skill in the art can readily appreciate the fact that the manner and content may be transformed into one or more forms without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure should not be construed as being limited only to the contents described in the following embodiments. The embodiments and features in the embodiments of the present disclosure may be arbitrarily combined with each other unless there is any conflict.

In the drawings, the size of one or more constituent elements, the thickness of a layer, or an area are sometimes exaggerated for clarity. Therefore, one aspect of the present disclosure is not necessarily limited to such dimensions, and the shapes and sizes of various components in the drawings do not reflect true proportions. In addition, the drawings schematically show ideal examples, and one aspect of the present disclosure is not limited to shapes, numerical values, etc. shown in the drawings.

Ordinal numbers such as "first", "second", and "third" in this disclosure are provided to avoid confusion of constituent elements and are not intended to limit the quantity. "A plurality" in this disclosure means a quantity of two or more.

In this disclosure, for convenience, "middle", "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner" are used , "outside" and other words indicating the orientation or positional relationship are used to illustrate the positional relationship of the constituent elements with reference to the drawings. They are only for the convenience of describing this specification and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation. , are constructed and operate in specific orientations and therefore should not be construed as limitations on the disclosure. The positional relationship of the constituent elements is appropriately changed depending on the direction in which the constituent elements are described. Therefore, they are not limited to the words and phrases described in the specification, and may be appropriately replaced according to circumstances.

In this disclosure, the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise expressly stated and limited. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be a direct connection, an indirect connection through an intermediate piece, or an internal connection between two elements. For those of ordinary skill in the art, the meanings of the above terms in this disclosure can be understood according to the circumstances.

Embodiments of the present disclosure provide a residual image detection method and a residual image detection device for a display panel, which can quantitatively and objectively evaluate the residual image level of a display panel, thereby improving the accuracy and evaluation efficiency of residual image detection results.

In some examples, the display panel applicable to the afterimage detection method of this embodiment may be a micro-OLED (Micro Light Emitting Diode) display panel, an organic light-emitting diode (OLED, Organic Light-Emitting Diode) display panel, a quantum dot light-emitting diode (QLED, Quantum dot Light Emitting Diode) display panel, or a display panel having a plurality of different display modes. Diode) display panel, mini diode (Mini-LED) display panel or liquid crystal display panel (LCD, Liquid Crystal Display). This embodiment does not limit the type of display panel.

In some examples, the display area of the display panel may include multiple pixel units. For example, one pixel unit may include three sub-pixels. The three sub-pixels may be red sub-pixels, green sub-pixels and blue sub-pixels respectively. Or, in other examples, one pixel unit may include four sub-pixels, and the four sub-pixels may be red sub-pixels, green sub-pixels, blue sub-pixels and white sub-pixels respectively. In some examples, the shape of the subpixel may be a rectangle, a diamond, a pentagon, or a hexagon. When a pixel unit includes three sub-pixels, the three sub-pixels can be sequentially spaced along a certain direction, or can be arranged in a Z-shaped manner; when a pixel unit includes four sub-pixels, the four sub-pixels can be sequentially spaced along a certain direction. Set or set in an array. However, this embodiment is not limited to this.

In some examples, each sub-pixel may include: a pixel circuit and a light-emitting element connected to the pixel circuit. The pixel circuit may include multiple transistors and at least one capacitor. For example, the pixel circuit may be a 3T1C structure, a 7T1C structure, a 5T1C structure, an 8T1C structure, or an 8T2C structure, etc., wherein T in the above circuit structure refers to a thin film transistor, C refers to a capacitor, the number before T represents the number of thin film transistors in the circuit, and the number before C represents the number of capacitors in the circuit. In some examples, the light-emitting element may be an element having a light-emitting area not greater than 1×10 ⁵ um ² , such as a micro light-emitting diode, a mini diode, an organic light-emitting diode, or a quantum dot light-emitting diode.

Taking the Micro-OLED display panel as an example, due to the influence of the aging and attenuation of the pixel unit, the luminous brightness of the pixel unit will decrease with the increase of the light-emitting time, and the degree of aging and attenuation of the pixel unit is not only related to the life of the luminescent material, but also related to The temperature of the display panel is related to the display gray scale. Since different pixel units of the display panel have different degrees of aging and attenuation, the luminous brightness of different pixel units decreases to different degrees, and a residual image will appear, which will reduce the display effect of the display panel and affect the user experience. The afterimage detection method provided in this embodiment can objectively and quantitatively evaluate the afterimage level of the display panel, thereby improving the accuracy and efficiency of the afterimage detection evaluation results, so as to improve the display effect of the display panel and enhance the user experience.

FIG. 1 is a flow chart of an afterimage detection method for a display panel provided by at least one embodiment of the present disclosure. In some examples, as shown in FIG. 1 , the afterimage detection method of the display panel provided in this example may include steps S11 to S14.

Step S11: Obtain first brightness information after the display panel to be detected switches from the first screen to the second screen. The first picture may include a plurality of first sub-pictures, and the display area of the display panel may include a plurality of sub-display areas corresponding to the plurality of first sub-pictures in a one-to-one manner. A sub-display area may be an area that displays a corresponding first sub-picture. In some examples, a first sub-picture may be a solid-color picture, and any two adjacent first sub-pictures may be solid-color pictures with different brightnesses. This embodiment does not limit the shape and size of the first sub-picture and the sub-display area. For example, the first picture may be a checkerboard picture, or may be a barcode picture, or may be a two-dimensional code picture, or may be other pictures with black and white interval images. For another example, at least one first sub-picture in the first picture may not be a solid color picture, and the brightness difference between the first sub-picture and adjacent first sub-pictures can be visually distinguished.

In some examples, the sub-display area may include at least one light-emitting unit. For example, a light-emitting unit may be a sub-pixel, or a light-emitting unit may be a pixel unit. For example, when the display panel displays the first image, the display grayscales of multiple light-emitting units in a sub-display area may be the same. For another example, when the display panel displays the first image, the display grayscales of the multiple light-emitting units of at least one sub-display area can be close to each other.

In some examples, the second picture may include a plurality of second sub-pictures. The second sub-picture may correspond to a boundary area of at least two adjacent sub-display areas. The second sub-picture may cover the boundary between the first sub-pictures of different brightness in the first picture. In this way, when the second picture is displayed, the boundary residual image between the adjacent first sub-pictures of different brightness of the first picture can be reflected, so as to facilitate the detection of the residual image. In some examples, the second picture may be an overall solid-color picture, and the display grayscales of multiple second sub-pictures of the second picture may be the same. However, this embodiment does not limit the display grayscale of the second picture, the number and shape of the second sub-pictures. In other examples, the second picture may include displaying grayscale Multiple second sub-pictures of the same color, and the second sub-pictures can be solid-color sub-pictures. In other examples, at least one second sub-picture in the second picture is not a solid color sub-picture.

In some examples, the longer the first picture is displayed on the display panel, the more favorable it is for the accuracy of the residual image detection. In the case of taking into account the detection efficiency, the display time of the first picture can be about 1 minute to 10 minutes, for example, about 5 minutes or 10 minutes. However, this embodiment is not limited to this.

In some examples, the longer the second picture is displayed on the display panel, the weaker the afterimage display. In order to improve the accuracy of afterimage detection and take into account detection efficiency, brightness collection can be completed within 5 minutes after the display panel switches to the second picture. For example, when collecting brightness, the display duration of the second picture may be less than or equal to 5 minutes. However, this embodiment is not limited to this.

In some examples, after the display panel to be detected switches from the first picture to the second picture, the brightness values of all the light-emitting units in the display area of the display panel can be collected to obtain the first brightness information. The first brightness information may include: brightness values of all light-emitting units in the display area. In some examples, an area imaging luminance meter may be used to collect the luminance values of all light-emitting units within the display area of the display panel. For example, the brightness value of the entire light-emitting unit of the display panel can be obtained through one collection. Through one acquisition, the brightness of the entire display area is collected, and the brightness values of different positions in the display area at the same time can be obtained, thereby eliminating the influence of temperature changes of the display panel on the afterimage detection results.

Step S12: Determine the second brightness information of each sub-display area according to the first brightness information. In some examples, the second brightness information of each sub-display area may be calculated using the brightness values of all light-emitting units of the display area. For example, the second brightness information of each sub-display area may be the average value of the brightness values of all light-emitting units in the sub-display area.

In some examples, for any sub-display area, abnormal brightness values in the sub-display area are removed, and the average value of the retained brightness values is calculated, and the average value is used as the second value of the sub-display area. brightness information. For example, the brightness values that do not meet the 3σ (3Sigma) criterion in the sub-display area can be removed, the average value of the brightness values that satisfy the 3σ criterion in the sub-display area can be calculated, and the average value can be used as the second value of the sub-display area. brightness information. Among them, the 3σ criterion is also called the Laida criterion. This criterion first assumes that a set of data only contains random errors, and calculates and processes it to obtain the standard deviation. It determines an interval according to a certain probability, and believes that any error exceeding this interval will not It is a random error but a gross error, and the data containing this gross error should be eliminated. This embodiment can effectively eliminate abnormal brightness values by adopting the 3σ criterion, which is beneficial to improving the accuracy of afterimage detection results. Regarding the processing method of the 3σ criterion, reference can be made to the implementation methods in related technologies, so no further details will be given here.

Step S13: Determine brightness change parameters between at least one sub-display area and adjacent sub-display areas based on the second brightness information of the multiple sub-display areas.

In some examples, for a sub-display area, when the gray level of the first sub-picture corresponding to the sub-display area is smaller than the gray level of the first sub-picture corresponding to the adjacent sub-display area, the third sub-display area is calculated. The difference between the second brightness information and the second brightness information of the adjacent sub-display area, and the ratio between the difference and the second brightness information of the sub-display area is used as the difference between the sub-display area and the adjacent sub-display area. The brightness change parameter between areas; when the gray scale of the first sub-picture corresponding to the sub-display area is greater than the gray level of the first sub-picture corresponding to the adjacent sub-display area, calculate the second sub-picture of the adjacent sub-display area. The difference between the brightness information and the second brightness information of the sub-display area, and the ratio between the difference and the second brightness information of the adjacent sub-display area is used as the difference between the sub-display area and the adjacent sub-display area. Brightness variation parameter between display areas. In this example, the brightness change parameter between two adjacent sub-display areas can be based on the second brightness information of the two adjacent sub-display areas and the grayscale of the first sub-picture corresponding to the first picture of the two adjacent sub-display areas. order to determine. In some examples, the first sub-picture is a solid-color sub-picture, and the gray scale of the first sub-picture is the gray scale of the solid-color sub-picture; when the first sub-picture is a non-solid color sub-picture, the gray scale of the first sub-picture can be This is the average display gray level of the sub-picture.

In some examples, multiple sub-display areas may be arranged sequentially along the first direction and the second direction. The first direction and the second The directions may cross, for example, the first direction may be perpendicular to the second direction. The brightness change parameter between a sub-display area and an adjacent sub-display area may include: a first brightness change parameter between the sub-display area and an adjacent sub-display area along the first direction, and a first brightness change parameter between the sub-display area and the adjacent sub-display area along the first direction. A second brightness change parameter between adjacent sub-display areas in the second direction. In some examples, for a sub-display area, based on the second brightness information of the sub-display area and the second brightness information of the adjacent sub-display area along the first direction, it may be determined that the sub-display area is different from the sub-display area along the first direction. The first brightness change parameter between adjacent sub-display areas; according to the second brightness information of the sub-display area and the second brightness information of the adjacent sub-display areas along the second direction, it can be determined that the sub-display area is consistent with the second brightness information along the second direction. The second brightness change parameter between adjacent sub-display areas in two directions.

In some examples, when the gray level of the first sub-picture corresponding to one sub-display area is smaller than the gray level of the first sub-picture corresponding to the adjacent sub-display area along the first direction, the second brightness of the sub-display area is calculated. The difference between the information and the second brightness information of the adjacent sub-display area along the first direction, and the ratio between the difference and the second brightness information of the sub-display area is used as the difference between the sub-display area and the second brightness information along the first direction. A first brightness change parameter between the adjacent sub-display areas in the first direction. When the gray level of the first sub-picture corresponding to the sub-display area is greater than the gray level of the first sub-picture corresponding to the adjacent sub-display area along the first direction, calculate the gray level of the adjacent sub-display area along the first direction. The difference between the second brightness information and the second brightness information of the sub-display area, and the ratio between the difference and the second brightness information of the adjacent sub-display area along the first direction is used as the A first brightness change parameter between the sub-display area and the adjacent sub-display area along the first direction. In the same way, the second brightness change parameter between the sub-display area and the adjacent sub-display area along the second direction can be determined.

Step S14: Determine afterimage evaluation parameters of the display panel based on brightness change parameters between at least one sub-display area and adjacent sub-display areas.

In some examples, the afterimage evaluation parameter may be the average value of all calculated brightness change parameters, that is, the ratio of the sum of the determined brightness change parameters to the number. In this example, the afterimage evaluation parameter can also be called the afterimage percentage (ISP, Image Sticking Percent)

Figure 2 is a schematic diagram of a human eye contrast sensitivity function. Human eye contrast sensitivity is a kind of human eye resolution ability. The human eye contrast sensitivity function measures the sensitivity of the human visual system to a variety of visual stimulus frequencies. The contrast sensitivity function of the human eye can be reflected in different spatial frequencies, and the human eye has different discrimination capabilities for target brightness. The abscissa shown in Figure 2 is the spatial frequency (for example, the interval frequency of black and white images in the same screen), and the ordinate represents the sensitivity. After research and analysis, the inventor found that when the background brightness and spatial frequency of the display panel are determined, the afterimage percentage taking into account the objective fact of the human eye contrast sensitivity function can be obtained by calculating and processing the brightness change of the display area. The afterimage percentage The afterimage level of the display panel can be objectively and quantitatively evaluated. The afterimage percentage is the reciprocal of the sensitivity in the contrast sensitivity function of the human eye. In this example, the spatial frequency is fixed by displaying the first picture, the background brightness is fixed by displaying the second picture, and then a series of processing is performed on the collected first brightness information to obtain objective facts that consider the contrast sensitivity function of the human eye. The percentage of afterimages can ensure that the afterimage evaluation parameters will not differ due to people's subjective consciousness, and can improve the accuracy and efficiency of the afterimage evaluation results.

The solution of this embodiment is illustrated below through some examples.

FIG. 3 is an example flowchart of an afterimage detection method for a display panel according to at least one embodiment of the present disclosure. The display panel in this example can be a Micro OLED display panel. In some examples, the number of display panels to be inspected may be greater than or equal to 3, and the display panels to be inspected have no poor image quality (Mura) after testing. Each display panel can be detected separately according to the following afterimage detection method. The detection environment temperature of the display panel can be 20 degrees Celsius to 30 degrees Celsius, for example, it can be 25 degrees Celsius. However, this embodiment is not limited to this.

In some examples, as shown in FIG. 3 , the afterimage detection method of the display panel of this embodiment may include the following steps S21 to S25.

Step S21: Obtain first brightness information after the display panel to be detected switches from the first screen to the second screen.

FIG. 4 is a partial schematic diagram of the first screen according to at least one embodiment of the present disclosure. In some examples, as shown in Figure 4, The first picture may be a checkerboard picture. The first picture may include a plurality of first sub-pictures arranged in a matrix. In this example, a first sub-picture can be a checkerboard. Multiple checkerboards can be roughly the same shape and size. The plurality of first sub-pictures may include a plurality of first solid-color sub-pictures 11 and a plurality of second solid-color sub-pictures 12 . The first solid color sub-picture 11 may be a solid color sub-picture with a first gray scale, and the second solid color sub-picture 12 may be a solid color sub-picture with a second gray scale. In the first picture, there is a light-dark contrast relationship at the boundary between the first solid-color sub-picture 11 and the adjacent second solid-color sub-picture 12 .

In some examples, gray scale refers to the level of tones in which the electromagnetic radiation intensity of ground objects appears on black and white images. It is a scale for dividing the spectral characteristics of ground objects. It represents the different brightness levels from the darkest to the brightest. , the more layers there are, the more delicate the picture effect can be presented. For example, taking an 8-bit display panel as an example, it can express 2 to the 8th power, a total of 256 brightness levels, usually called 256 gray levels, including 0 to 255 gray levels. Therefore, grayscale generally appears in the shape of integers. In this example, the first gray level may be 0 gray level, and the second gray level may be 255 gray level. In this way, the gray scale difference between adjacent checkerboards is the largest, which is beneficial to improving the contrast between the afterimage position and other areas in the second picture that is subsequently displayed. In other examples, the first gray level may be 255 gray levels, and the second gray level may be 0 gray levels.

In some examples, as shown in FIG. 4 , the shapes and sizes of the first solid color sub-picture 11 and the second solid color sub-picture 12 may be substantially the same. For example, both the first solid color sub-picture 11 and the second solid color sub-picture 12 may be rectangular, for example, square. Along the first direction Can be arranged alternately. A plurality of first sub-pictures arranged along the first direction X may be called a row of first sub-pictures. Multiple lines of first sub-pictures may be arranged along the second direction Y. A plurality of first sub-pictures arranged along the second direction Y may be called a column of first sub-pictures, and a plurality of columns of first sub-pictures may be arranged along the first direction X. In this example, the number of rows of the first sub-picture may be m rows and the number of columns may be n columns. In other words, the first sub-picture may include m×n checkerboards.

In this example, a solid-color picture means that the display grayscales of all light-emitting units (such as sub-pixels) in the picture are the same.

FIG. 5 is a partial schematic diagram of an afterimage displayed on a display panel according to at least one embodiment of the present disclosure. In some examples, when the display panel switches to display the second picture after displaying a static first picture for a long time, the display picture of the display panel may be as shown in FIG. 5 .

In some examples, the second picture may be a solid color picture with a third gray scale. For example, the third gray level may be 255 gray levels. That is, the second picture may be a pure white picture. When the display panel displays the second image, the display gray levels of all light-emitting units in the display area are 255 gray levels. In this example, by setting the second picture to be a pure white picture, it is beneficial to display the afterimage of the first picture and facilitate afterimage detection. However, this embodiment is not limited to this.

In some examples, the display area may include a plurality of sub-display areas that correspond one-to-one to a plurality of first sub-pictures of the first picture. When the first picture is displayed, each sub-display area displays one first sub-picture. Each sub-display area may correspond to a checkerboard in the first picture. Taking the first picture including m×n checkerboards as an example, the display area may be divided into m×n sub-display areas. For example, the i-th row and j-th column sub-display area can be recorded as B(i,j). i can be an integer less than or equal to m, and j can be an integer less than or equal to n. The adjacent sub-display areas of sub-display area B(i,j) along the first direction The adjacent sub-display area along the second direction Y may be the i+1th row and kth column sub-display area B(i+1,j).

In some examples, a surface imaging luminance meter can be used to collect the brightness information of all light-emitting units of the display panel after switching from the first screen to the second screen in a single operation. Since the temperature of the display panel affects the display brightness, the brightness information collected at different times will be affected by temperature. This example collects the entire surface of the display panel in one operation, which can eliminate the impact of the temperature change of the display panel on the test evaluation results.

FIG. 6 is a schematic diagram of brightness information collection according to at least one embodiment of the present disclosure. In some examples, as shown in FIG. 6 , the collection device 20 (such as an area imaging luminance meter) may be located on the light exit side of the display panel 10 to monitor the display panel 10 Perform brightness collection. The display area of the display panel 10 may include a plurality of light emitting units 110 (eg, sub-pixels). The light emitting unit 110 may be, for example, rectangular. The length of the light emitting unit 110 along the first direction X may be a, and the length along the second direction Y may be b. The number of light-emitting units 110 along the first direction X in the display area of the display panel 10 may be Nx, and the number of light-emitting units 110 along the second direction Y may be Ny. For example, the attribute information of the light-emitting unit 110 of the display panel may at least include: the length a of the light-emitting unit 110 along the first direction X, the length b along the second direction Y, the number Nx of the light-emitting units in the display area along the first direction X, The number of light-emitting units Ny in the display area along the second direction Y.

In some examples, as shown in FIG. 6 , the collection device 20 may include a charge-coupled device (CDD, Charge-Coupled Device). The charge coupled element lens may have a focal length of f. In a plane perpendicular to the plane of the display panel 10 and passing through the center line of the charge-coupled element, the effective sampling diameter of the charge-coupled element may be L. In a plane perpendicular to the plane of the display panel 10 , passing through the center line of the charge-coupled element, and parallel to the first direction X, the number of light-emitting units within the effective sampling diameter range may be nx; In a plane that passes through the center line of the charge-coupled element and is parallel to the second direction Y, the number of light-emitting units within the effective sampling diameter range may be ny. The sampling viewing angle of the charge-coupled element (eg, the angle between the sampling edge line of sight and the centerline of the charge-coupled element) may be θ. In this example, the collection parameters of the collection device 20 may include at least: the lens focal length f of the charge-coupled element, the sampling angle of view θ, and the effective sampling diameter L. For example, when collecting brightness, the center line of the charge-coupled element can pass through the center of the light-emitting surface of the display panel to be detected. However, this embodiment is not limited to this.

In some examples, the one-time full-surface acquisition condition for the display panel may include: 0.01<ka×Nx/f<0.1; where k=nx/Nx or k=ny/Ny. For example, k can be greater than 0.3. When the collection device 20 meets the one-time collection conditions for the entire display panel to be detected, the collection device 20 can collect the brightness values of all the light-emitting units of the display panel excluding temperature factors. In this way, afterimage detection using the collected first brightness information is conducive to improving the accuracy and efficiency of the detection and evaluation results. In other examples, the one-time whole-surface acquisition condition may also include: the sampling angle θ is less than or equal to 8 degrees. In this example, when the one-time whole-surface collection condition is met, the collection device 20 can collect the brightness values of all the light-emitting units of the display panel while excluding the viewing angle and temperature factors, so as to help improve the accuracy and evaluation efficiency of the detection and evaluation results. .

Table 1

Table 1 shows examples of attribute information and collection parameters of light-emitting units of various types of display panels. As shown in Table 1, the display panel 1 can be a small size (for example, 0.39 inches (inch), with a resolution of 1920×1080) display area The second display panel can be a large-size (for example, 6.0 inch, with a resolution of 2560 × 1600) display panel, and the third display panel can be a large-size (for example, 6.0 inch, with a resolution of 1280 × 720) display panels. The fourth display panel can be a large size (for example, 5.0 inch, with a resolution of 1920×1080) display panel. The fifth display panel can be a large size (for example, 7.0 inch, with a resolution of 1024 × 600) display panel. The sixth display panel can be a large size display panel. size (for example, 9.7inch with a resolution of 2048×1536) display panel. As can be seen from Table 1, display panel one is a small-size display panel, and display panels two to six are all large-size display panels. For small-size display panels, when the conditions for one-time full-surface acquisition are met, the acquisition equipment can be used to collect the brightness values of all light-emitting units of the display panel at one time, thereby eliminating the effects of viewing angle and temperature on the afterimage detection results. For large-size display panels, since the collection equipment only collects the brightness value of the light-emitting unit in a small area of the display panel at a time, the brightness value of the light-emitting unit beyond the collection range will be distorted, and multiple collections are required to achieve full-surface collection. , the influence of temperature on the afterimage detection results cannot be ruled out during multiple acquisition processes.

In some examples, when the one-time full-surface acquisition condition for the display panel is met, the display panel can be collected at one time to obtain the first brightness information, and the first brightness information can be used to perform afterimage detection excluding the influence of temperature. When the conditions for one-time full-surface collection of the display panel are not met, the display panel can be collected multiple times to obtain the first brightness information, and the first brightness information can be used to perform after-image detection. However, the after-image detection results obtained by this detection process will exist. Affected by temperature, the accuracy of afterimage detection results will be affected.

This example uses the one-time full-surface acquisition condition to determine whether the brightness values of all light-emitting units in the display area can be obtained for the display panel to be detected through one-time full-surface acquisition. This helps to distinguish whether the temperature influence is eliminated during the after-image detection process. Or exclude the effects of temperature and viewing angle.

In other examples, the afterimage detection method of this example may also include: obtaining the brightness curves of the display panel at different viewing angles when displaying the initial image. For example, when the display panel displays the initial image, the brightness information of the display panel at different viewing angles can be obtained through the acquisition device, thereby obtaining the brightness curve. For example, the initial picture can be a solid color picture, and the display grayscale can be 255 grayscales. The brightness curve may include point brightness values of the display panel at different viewing angles.

FIG. 7 is a schematic diagram of brightness curves of a display panel under different viewing angles according to at least one embodiment of the present disclosure. In Figure 7, the abscissa can represent the sampling angle of view of the collection device, and the ordinate can represent the point brightness value. It can be seen from Figure 7 that when the sampling angle is 0 degrees, the point brightness value is the largest. As the sampling angle gradually increases, the point brightness value becomes smaller. For example, the fitting function of the brightness curve in Figure 7 can be:
y＝-5E-08x ⁵ -3E-07x ⁵ +0.0009x ⁴ +0.002x ³ -1.6524x ² -2.1549x+1124.9.

In some examples, after acquiring the first brightness information, the brightness curve may be used to perform brightness calibration on the first brightness information. For example, the brightness of the light-emitting unit at a large sampling angle attenuates significantly. The brightness of the light-emitting unit at a non-frontal viewing angle (that is, a non-0-degree viewing angle) can be corrected according to the following formula:

Among them, L0 _(x) is the brightness value of the light-emitting unit corresponding to the sampling angle x position, y _(x) is the point brightness at the sampling angle x, y ₍₀₎ is the point brightness at the sampling angle 0 degrees, L1 _(x) is the corrected brightness value of the light-emitting unit under the sampling angle x. For example, in Figure 7, the brightness value of the point at the sampling angle of 10 degrees is attenuated to 10% of that at 0 degrees. Then the brightness value of the light-emitting unit corresponding to the position of the sampling angle of 10 degrees can be corrected to the collected brightness value and 0.9 ratio. In this example, the brightness curve is used to calibrate the collected first brightness information, so that the influence of the viewing angle can be eliminated in the afterimage detection process.

In other examples, the afterimage detection method of this example may further include: obtaining the brightness curves of the display panel at different viewing angles when displaying the first picture. For example, when the display panel displays the first picture, the brightness information of multiple sub-display areas of the display panel at different viewing angles can be acquired through a collection device, thereby obtaining a brightness curve. The brightness curve may include point brightness values of multiple sub-display areas of the display panel at different viewing angles. Then, after acquiring the first brightness information, the brightness curve can be used to perform brightness calibration on the first brightness information. For example, highlight each sub-display area separately. degree calibration. In this way, the influence of the viewing angle can be eliminated in the afterimage detection process.

Step S22: Determine the second brightness information of each sub-display area according to the first brightness information. In some examples, for each sub-display area, abnormal brightness values in the sub-display area can be removed. For example, abnormal brightness values can be removed according to the 3Sigma criterion. After removing abnormal brightness values, the average value of the brightness values in each sub-display area may be calculated as the second brightness information. For example, the second brightness information of a sub-display area may be equal to the ratio of the sum of brightness values excluding abnormal brightness values in the sub-display area to the total number of brightness values. For example, the second brightness information of sub-display area B(i,j) can be recorded as L(i,j).

Step S23: Determine brightness change parameters between at least one sub-display area and adjacent sub-display areas based on the second brightness information of the multiple sub-display areas.

In some examples, the brightness variation parameters between a sub-display area and an adjacent sub-display area may include: a first brightness variation parameter between a sub-display area and an adjacent sub-display area along a first direction, and a second brightness variation parameter between a sub-display area and an adjacent sub-display area along a second direction. For example, a sub-display area B(i, j) in the i-th row and the j-th column has a first brightness variation parameter CH(i, j) along the first direction (i.e., the horizontal direction), and a second brightness variation parameter CV(i, j) along the second direction (i.e., the vertical direction). In other words, the first brightness variation parameter is a brightness variation parameter between horizontally adjacent sub-display areas, and the second brightness variation parameter is a brightness variation parameter between vertically adjacent sub-display areas.

In some examples, as shown in Figures 4 and 5, when i is an odd number and j is an odd number, the first gray level of the first sub-picture corresponding to the sub-display area B(i, j) may be 255 gray levels, The second gray level of the first sub-picture corresponding to the adjacent sub-display area B(i,j+1) of the sub-display area B(i,j) along the first direction may be 0 gray level, and the sub-display area B(i) The first brightness change parameter between ,j) and sub-display area B(i,j+1) can be determined according to the following formula:

Wherein, L(i, j) is the second brightness information of the sub-display area B(i, j), and L(i, j+1) is the second brightness information of the sub-display area B(i, j+1).

When i is an odd number and j is an odd number, the first gray level of the first sub-picture corresponding to the sub-display area B(i, j) can be 255 gray levels, and the first gray level of the sub-display area B(i, j) along the second direction The second gray level of the first sub-picture corresponding to the adjacent sub-display area B(i+1,j) may be 0 gray level, and the sub-display area B(i,j) and the sub-display area B(i+1,j) The second brightness change parameter between can be determined according to the following formula:

Wherein, L(i,j) is the second brightness information of the sub-display area B(i,j), and L(i+1,j) is the second brightness information of the sub-display area B(i+1,j).

When i is an odd number and j is an even number, the first gray level of the first sub-picture corresponding to the sub-display area B(i, j) can be 0 gray level, and the first gray level of the sub-display area B(i, j) along the first direction The second gray level of the first sub-picture corresponding to the adjacent sub-display area B(i, j+1) may be 255 gray levels. The sub-display area B(i, j) and the sub-display area B(i, j+1) The first brightness change parameter between can be determined according to the following formula:

Wherein, L(i,j) is the second brightness information of the sub-display area B(i,j), and L(i,j+1) is the second brightness information of the sub-display area B(i,j+1).

When i is an odd number and j is an even number, the first gray level of the first sub-picture corresponding to the sub-display area B (i, j) can be 0 gray level, and the sub-display area B (i, j) along the second direction The second gray level of the first sub-picture corresponding to the adjacent sub-display area B(i+1,j) may be 255 gray levels. The sub-display area B(i,j) and the sub-display area B(i+1,j) The second brightness change parameter between can be determined according to the following formula:

When i is an even number and j is an odd number, the first grayscale of the first sub-image corresponding to the sub-display area B (i, j) may be grayscale 0, the second grayscale of the first sub-image corresponding to the adjacent sub-display area B (i, j+1) of the sub-display area B (i, j) along the first direction may be grayscale 255, and the first brightness variation parameter between the sub-display area B (i, j) and the sub-display area B (i, j+1) may be determined according to the following formula:

When i is an even number and j is an odd number, the first gray level of the first sub-picture corresponding to the sub-display area B (i, j) can be 0 gray level, and the sub-display area B (i, j) along the second direction The second gray level of the first sub-picture corresponding to the adjacent sub-display area B(i+1,j) may be 255 gray levels. The sub-display area B(i,j) and the sub-display area B(i+1,j) The second brightness change parameter between can be determined according to the following formula:

When i is an even number and j is an even number, the first gray level of the first sub-picture corresponding to the sub-display area B(i, j) can be 255 gray levels, and the first gray level of the sub-display area B(i, j) along the first direction The second gray level of the first sub-picture corresponding to the adjacent sub-display area B(i, j+1) may be 0 gray level, and the sub-display area B(i, j) and the sub-display area B(i, j+1) The first brightness change parameter between can be determined according to the following formula:

When i is an even number and j is an even number, the first gray level of the first sub-picture corresponding to the sub-display area B (i, j) can be 0 gray level, and the sub-display area B (i, j) along the second direction The second gray level of the first sub-picture corresponding to the adjacent sub-display area B(i+1,j) may be 255 gray levels. The sub-display area B(i,j) and the sub-display area B(i+1,j) The second brightness change parameter between can be determined according to the following formula:

Wherein, L(i, j) is the second brightness information of the sub-display area B(i, j), and L(i+1, j) is the second brightness information of the sub-display area B(i+1, j).

In some examples, as shown in Figures 4 and 5, for a row of sub-display areas, n-1 first brightness change parameters can be calculated based on the second brightness information of n sub-display areas along the first direction X. For a column of sub-display areas, m-1 second brightness change parameters can be calculated based on the second brightness information of m sub-display areas along the second direction Y. For the entire display area, (n-1)×m first brightness change parameters and (m-1)×n second brightness change parameters can be calculated.

In other examples, after the arrangement order of the first sub-picture and the second sub-picture of the first picture is changed in the first direction X and the second direction Y, the first brightness between adjacent sub-display areas is changed. The calculation formulas of the change parameter and the second brightness change parameter will undergo adaptive changes. For example, for two adjacent sub-display areas, the second brightness information of the corresponding sub-display area with a smaller gray scale of the first sub-picture and the corresponding sub-display area with a larger gray scale of the first sub-picture can be calculated. The difference value of the second brightness information, and the ratio between the difference value and the second brightness information of the corresponding sub-display area with smaller grayscale of the first sub-picture is used as the difference between the two adjacent sub-display areas. brightness change parameters.

Step S24: Determine the afterimage evaluation parameters of the display panel based on the brightness change parameters between at least one sub-display area and adjacent sub-display areas.

In some examples, the afterimage evaluation parameters can be determined according to the following formula:

Among them, ISP is the afterimage evaluation parameter, also known as the afterimage percentage. μ is the correction coefficient, and μ is greater than 0. For example, μ=(m-1)n+(n-1)m=2mn-m-n.

In this example, the influence of the temperature and viewing angle of the display panel can be eliminated in the acquisition process of the first brightness information, and the objective fact of the contrast sensitivity function of the human eye is considered in the calculation process of the afterimage percentage. Therefore, the ISP obtained in this example not only eliminates the influence of the temperature and viewing angle changes of the display panel on the after-image test evaluation results, but also takes into account the objective fact of the contrast sensitivity function of the human eye. The ISP in this example can reflect the afterimage level of the display panel. The larger the ISP value, the more serious the afterimage of the display panel.

Step S25: Determine the afterimage level (ISL, Image Sticking Level) of the display panel according to the set level comparison table and the afterimage evaluation parameters of the display panel.

In some examples, a level comparison table as shown in Table 2 may be set. The grade comparison table can record the correspondence between the data intervals of the afterimage evaluation parameters and the afterimage grade. Using the grade comparison table, the calculated after-image evaluation parameters can be converted into after-image levels in order to unify the evaluation methods for after-image detection.

Table 2 Grade comparison table

As shown in Table 2, multiple data intervals of ISP can correspond to multiple levels with ISL less than or equal to 4. Compared with the evaluation method of afterimage level, the ISP in this example can not only quantify the afterimage level of the display panel, but also more accurately distinguish different levels of afterimages.

FIG. 8 is a schematic comparison diagram of afterimage detection results according to at least one embodiment of the present disclosure. In Figure 8, the abscissa represents the number of the display panel to be detected, and the ordinate represents the afterimage level. The solid line in FIG. 8 represents the afterimage detection result obtained by using human eye detection method, and the dotted line represents the afterimage detection result obtained by using the method of this embodiment. As shown in Figure 8, the agreement between the detection results obtained by the afterimage detection method in this example and the detection results obtained by using the human eye detection method is as high as 95%. That is, the result trend of the afterimage detection method of this embodiment is consistent with the result trend of the human eye detection method. The afterimage detection method provided in this embodiment can be used to quantitatively test and evaluate the afterimage of a display panel (for example, a Micro OLED display panel) to assist in improving the user experience.

The afterimage detection method provided in this embodiment collects the first brightness information of the display panel after switching to the second screen after the first screen (for example, a checkerboard screen) has been lit for a long time, and is based on the human eye. The contrast sensitivity function is used to objectively and quantitatively evaluate the afterimage level of the display panel, ensuring that the calculated afterimage evaluation parameters will not differ due to human subjective consciousness, and improving the accuracy and evaluation efficiency of the detection and evaluation results. Moreover, by collecting the first brightness information from the entire display panel at a single time, the influence of temperature on the afterimage detection results can be eliminated. Moreover, using the brightness curve to perform brightness compensation on the collected first brightness information can eliminate the impact of the viewing angle on the afterimage detection results.

FIG. 9 is a schematic diagram of an afterimage detection device of a display panel according to at least one embodiment of the present disclosure. In some examples, as shown in FIG. 9 , the afterimage detection device 31 of the display panel of this embodiment may include: an acquisition module 311 and a processing module. 312. The acquisition module 311 may be configured to acquire the first brightness information after the display panel to be detected switches from the first screen to the second screen. Wherein, the first picture includes a plurality of first sub-pictures, the display area of the display panel includes a plurality of sub-display areas corresponding to the plurality of first sub-pictures, the second picture includes a plurality of second sub-pictures, and the second sub-pictures are The sub-picture corresponds to the boundary area of at least two adjacent sub-display areas. The first processing module 312 is configured to determine the second brightness information of each sub-display area according to the first brightness information; and determine the relationship between at least one sub-display area and adjacent sub-displays according to the second brightness information of the plurality of sub-display areas. a brightness change parameter between areas; and determining an afterimage evaluation parameter of the display panel based on a brightness change parameter between the at least one sub-display area and an adjacent sub-display area.

In some examples, the afterimage detection device may further include: a storage module. The storage module can be configured to store a set level comparison table. The grade comparison table can record the correspondence between the numerical range of the afterimage evaluation parameters and the afterimage grade. The first processing module may be configured to determine the afterimage level of the display panel according to the set level comparison table and the afterimage evaluation parameters of the display panel.

In some examples, the storage module may include volatile memory (Volatile Memory), such as random access memory (RAM, Random-Access Memory); or may include non-volatile memory (non-Volatile Memory), such as read-only memory. Memory (ROM, Read-Only Memory), flash memory (flash memory), hard disk (HDD, Hard Disk Drive) or solid state drive (SSD, Solid-State Drive); or can include a combination of the above types of memory.

In some examples, the first processing module 312 and the acquisition module 311 may be integrated in one module, and the integrated module may be a processor, or may be a collective name for multiple processing elements. For example, the processor may be a Central Processing Unit (CPU), or other general-purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), or an on-site processor. Programmable gate array (FPGA, Field-programmable Gate Array) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general purpose processor may be a microprocessor or may be any conventional processor or the like. The processor may include at least one of a baseband processor, a video processing chip, and the like.

FIG. 10 is a schematic diagram of an afterimage detection system of a display panel according to at least one embodiment of the present disclosure. In some examples, as shown in FIG. 10 , the acquisition module 311 of the afterimage detection device 31 can perform data transmission with the display panel 10 and the acquisition device 20 respectively. For example, the acquisition module 311 of the afterimage detection device 31 can acquire the first brightness information after the display panel 10 switches from the first screen to the second screen from the collection device 20 . For another example, the acquisition module 311 can control the display panel 10 to display the first screen or the second screen. However, this embodiment is not limited to this. In other examples, the acquisition device 20 and the afterimage detection device 31 may be integrated into one device.

FIG. 11 is another flowchart of an afterimage detection method for a display panel according to at least one embodiment of the present disclosure. In some examples, as shown in FIG. 11 , the afterimage detection method of this embodiment may include steps S31 and S32.

Step S31: Determine whether the one-time whole-surface collection condition for the display panel is met based on the attribute information of the light-emitting unit in the display area of the display panel to be detected and the collection parameters of the collection device. For example, the attribute information of the light-emitting unit in the display area may include: the length of the light-emitting unit along the first direction, the length of the light-emitting unit along the second direction, the number of light-emitting units along the first direction in the display area, the length of the light-emitting unit along the second direction in the display area, The number of light-emitting units in two directions. The collection parameters of the collection device may include: lens focal length of the charge-coupled element, sampling angle of view, and effective sampling diameter.

In some examples, the one-time whole-surface acquisition conditions include: 0.01<ka×Nx/f<0.1; where k=nx/Nx or k=ny/Ny;

Where, f represents the focal length of the lens, a represents the length of the light-emitting units in the display area along the first direction, Nx represents the number of light-emitting units in the display area along the first direction, and Ny represents the length of the light-emitting units in the display area along the second direction. The number of light-emitting units, the first direction is perpendicular to the second direction; nx represents the number of light-emitting units within the effective sampling diameter range along the first direction, ny represents the effective sampling along the second direction The number of light-emitting units within the diameter range.

Step S32: After the one-time full-surface acquisition condition is met and the display panel switches from the first screen to the second screen, obtain the first brightness information of the display panel through one acquisition in order to utilize the first brightness. information for afterimage evaluation.

Regarding the execution process of the afterimage detection method in this example, reference can be made to the description of the corresponding embodiment in FIG. 6 , so the details will not be described again.

The afterimage detection method of the display panel provided by this embodiment can eliminate the influence of temperature on the afterimage detection results by collecting the first brightness information for the entire display panel in a single time, thus helping to improve the accuracy of the detection and evaluation results.

FIG. 12 is another schematic diagram of an afterimage detection device of a display panel according to at least one embodiment of the present disclosure. In some examples, as shown in FIG. 12 , the afterimage detection device 32 of this example may include: a second processing module 321 and a collection module 322 . The second processing module 321 is configured to determine whether the one-time whole-surface collection condition for the display panel is met based on the attribute information of the light-emitting unit of the display area of the display panel to be detected and the collection parameters of the collection device. The acquisition module 322 is configured to obtain the first brightness information of the display panel through one acquisition after the one-time full-surface acquisition condition is met and the display panel switches from the first screen to the second screen, so as to utilize the third screen. A brightness information is used for afterimage evaluation. In some examples, the second processing module 321 may be a processor; the acquisition module 322 may include a charge coupled element. However, this embodiment is not limited to this. For the description of the afterimage detection device of this embodiment, reference can be made to the description of the previous embodiment, so the details will not be described again.

In addition, at least one embodiment of the present disclosure also provides a non-transitory computer-readable storage medium storing a computer program. When the computer program is executed, the steps of the afterimage detection method as shown in Figure 1 or Figure 3 are implemented.

Those of ordinary skill in the art can understand that all or some steps, systems, functional modules or units in the devices disclosed above can be implemented as software, firmware, hardware and appropriate combinations thereof. In hardware implementations, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may consist of several physical components. Components execute cooperatively. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or a microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer-readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). As is known to those of ordinary skill in the art, the term computer storage media includes volatile and nonvolatile media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. removable, removable and non-removable media. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disk (DVD) or other optical disk storage, magnetic cassettes, tapes, disk storage or other magnetic storage devices, or may Any other medium used to store the desired information and that can be accessed by a computer. Additionally, it is known to those of ordinary skill in the art that communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media .

The basic principles, main features, and advantages of the present disclosure have been shown and described above. The present disclosure is not limited by the above-mentioned embodiments. What is described in the above-mentioned embodiments and descriptions only illustrates the principles of the present disclosure. Without departing from the spirit and scope of the present disclosure, there will be many changes and improvements in the present disclosure. These changes and improvements are within the scope of the claimed disclosure.

Claims

A method for detecting residual images of a display panel, including:

Obtain the first brightness information after the display panel to be detected switches from the first picture to the second picture; wherein the first picture includes a plurality of first sub-pictures, and the display area of the display panel includes and the plurality of first sub-pictures. A plurality of sub-display areas corresponding one-to-one to the first sub-picture, the second sub-picture including a plurality of second sub-pictures, the second sub-picture corresponding to the boundary area of at least two adjacent sub-display areas;

Determine second brightness information of each sub-display area according to the first brightness information;

Determine a brightness change parameter between at least one sub-display area and an adjacent sub-display area according to the second brightness information of the plurality of sub-display areas;

An afterimage evaluation parameter of the display panel is determined according to a brightness variation parameter between the at least one sub display area and an adjacent sub display area.
The method according to claim 1, wherein determining the afterimage evaluation parameter of the display panel according to the brightness change parameter between the at least one sub-display area and an adjacent sub-display area includes: calculating the determined The average value of the brightness change parameters is used as the afterimage evaluation parameter.
The method of claim 1, wherein determining a brightness change parameter between at least one sub-display area and an adjacent sub-display area based on the second brightness information of the plurality of sub-display areas includes:

For a sub-display area, when the gray scale of the first sub-picture corresponding to the sub-display area is smaller than the gray scale of the first sub-picture corresponding to the adjacent sub-display area, calculate the second brightness information of the sub-display area and the corresponding The difference between the second brightness information of the adjacent sub-display area, and the ratio between the difference and the second brightness information of the sub-display area is used as the difference between the sub-display area and the adjacent sub-display area. The brightness change parameters between;

When the gray scale of the first sub-picture corresponding to the sub-display area is greater than the gray scale of the first sub-picture corresponding to the adjacent sub-display area, calculate the second brightness information of the adjacent sub-display area and the sub-display area The difference between the second brightness information of the adjacent sub-display area, and the ratio between the difference and the second brightness information of the adjacent sub-display area is used as the brightness between the sub-display area and the adjacent sub-display area. Change parameters.
The method according to any one of claims 1 to 3, wherein determining the brightness variation parameter between at least one sub-display area and an adjacent sub-display area according to the second brightness information of the plurality of sub-display areas comprises:

For a sub-display area, determine the relationship between the sub-display area and the adjacent sub-display along the first direction based on the second brightness information of the sub-display area and the second brightness information of the adjacent sub-display area along the first direction. The first brightness change parameter between regions;

According to the second brightness information of the sub-display area and the second brightness information of the adjacent sub-display area along the second direction, the second brightness information between the sub-display area and the adjacent sub-display area along the second direction is determined. Brightness change parameter; wherein the first direction intersects the second direction.
The method of claim 4, wherein the first direction is perpendicular to the second direction.
The method according to claim 5, wherein determining the afterimage evaluation parameter of the display panel according to the brightness change parameter between the at least one sub-display area and an adjacent sub-display area includes: according to the following formula Calculate afterimage evaluation parameters:

Wherein, ISP is the afterimage evaluation parameter, n represents the number of sub-display areas along the first direction, m represents the number of sub-display areas along the second direction; m and n are both integers greater than 1; μ is Correction coefficient, and μ is greater than 0;

CH(i,j) represents the first brightness change parameter between the sub-display area located in the i-th row and j-th column and the adjacent sub-display area along the first direction. CV(i,j) represents the first brightness change parameter located in the i-th row and j-th column. The second brightness change parameter between the sub-display area of column j and the adjacent sub-display area along the second direction.
The method according to any one of claims 1 to 6, wherein the sub-display area includes at least one light-emitting unit; the first brightness information includes: brightness values of all light-emitting units in the display area.
The method according to claim 7, wherein determining the second brightness information of each sub-display area according to the first brightness information includes:

Abnormal brightness values of the sub-display area are removed, and the average value of the retained brightness values is calculated, and the average value is used as the second brightness information of the sub-display area.
The method according to claim 8, wherein removing abnormal brightness values in the sub-display area includes: removing brightness values that do not meet the 3σ criterion in the sub-display area.
The method according to any one of claims 1 to 9, further comprising: obtaining brightness curves of the display panel at different viewing angles;

After obtaining the first brightness information after the display panel switches from the first screen to the second screen, the method further includes: using the brightness curve to perform brightness calibration on the first brightness information.
The method according to any one of claims 1 to 10, wherein the first picture is a checkerboard picture, the checkerboard picture includes a plurality of first sub-pictures arranged in a matrix, the plurality of first sub-pictures The picture includes a plurality of first solid-color sub-pictures and a plurality of second solid-color sub-pictures. The first solid-color sub-pictures are solid-color sub-pictures with a first gray scale, and the second solid-color sub-pictures are a solid color sub-picture with a second gray scale. Pure color sub-pictures; along the row direction and column direction of the matrix, the first solid color sub-pictures and the second solid color sub-pictures are alternately arranged; the first gray scale is different from the second gray scale.
The method according to claim 11, wherein the first grayscale is grayscale 0 and the second grayscale is grayscale 255; or, the first grayscale is grayscale 255 and the second grayscale is grayscale 0.
The method according to claim 11, wherein the second picture is a solid color picture with a third gray scale, the third gray scale is different from the first gray scale and the second gray scale, or the The third gray level is the same as the first gray level or the second gray level.
The method of claim 13, wherein the third gray level is a 255 gray level.
The method according to any one of claims 1 to 14, further comprising: determining the afterimage level of the display panel according to the afterimage evaluation parameters of the display panel according to the set level comparison table; the level comparison table The corresponding relationship between the numerical range of the afterimage evaluation parameter and the afterimage level is recorded.
The method according to any one of claims 1 to 15, wherein said obtaining the first brightness information after the display panel to be detected switches from the first screen to the second screen includes: displaying the first brightness information on the display panel. When the second screen is displayed, a single brightness collection is performed on the entire display area of the display panel to obtain the first brightness information.
An afterimage detection device for a display panel, including:

The acquisition module is configured to acquire the first brightness information after the display panel to be detected switches from the first picture to the second picture; wherein the first picture includes a plurality of first sub-pictures, and the display area of the display panel includes A plurality of sub-display areas corresponding to the plurality of first sub-pictures in a one-to-one manner, the second sub-picture including a plurality of second sub-pictures corresponding to the boundary area of at least two adjacent sub-display areas ;

The first processing module is configured to determine the second brightness information of each sub-display area according to the first brightness information; determine the brightness change parameter between at least one sub-display area and the adjacent sub-display area according to the second brightness information of the plurality of sub-display areas; and determine Afterimage evaluation parameters of the display panel.
A non-transitory computer-readable storage medium stores a computer program, wherein when the computer program is executed, the afterimage detection method for a display panel according to any one of claims 1 to 16 is implemented.
A method for detecting residual images of a display panel, including:

Determine whether the one-time full-surface collection condition for the display panel is met based on the attribute information of the light-emitting unit in the display area of the display panel to be detected and the collection parameters of the collection device;

After the one-time full-surface acquisition condition is met and the display panel switches from the first screen to the second screen, the first brightness information of the display panel is obtained through one-time acquisition, so as to use the first brightness information to perform residual image processing. evaluate.
The method according to claim 19, wherein the one-time whole-surface acquisition conditions include:
0.01<ka×Nx/f<0.1; where, k=nx/Nx or k=ny/Ny;

Where, f represents the focal length of the lens, a represents the length of the light-emitting units in the display area along the first direction, Nx represents the number of light-emitting units in the display area along the first direction, and Ny represents the length of the light-emitting units in the display area along the first direction. The number of light-emitting units along the second direction, the first direction is perpendicular to the second direction; nx represents the number of light-emitting units within the effective sampling diameter range along the first direction, and ny represents the number of light-emitting units along the first direction. The number of light-emitting units within the effective sampling diameter range in the second direction.
An afterimage detection device for a display panel, including:

The second processing module is configured to determine whether the one-time full-surface collection condition for the display panel is met based on the attribute information of the light-emitting unit in the display area of the display panel to be detected and the collection parameters of the collection device;

A collection module configured to obtain the first brightness information of the display panel through one collection after the one-time full-surface collection condition is met and the display panel switches from the first picture to the second picture, so as to utilize the third A brightness information is used for afterimage evaluation.