CN114113141A

CN114113141A - Method and device for determining crease degree of display screen

Info

Publication number: CN114113141A
Application number: CN202111431641.9A
Authority: CN
Inventors: 张仁伟
Original assignee: Hefei Visionox Technology Co Ltd
Current assignee: Hefei Visionox Technology Co Ltd
Priority date: 2021-11-29
Filing date: 2021-11-29
Publication date: 2022-03-01
Anticipated expiration: 2041-11-29
Also published as: CN114113141B

Abstract

The application relates to a method and a device for determining crease degree of a display screen. The method comprises the following steps: acquiring brightness values and chromatic values of a plurality of test points when the display screen presents the same image, wherein the distribution areas of the plurality of test points comprise bendable areas of the display screen; determining a maximum luminance difference and a maximum chrominance difference of the display screen based on the luminance value and the chrominance value; and determining the crease degree of the bendable region based on the maximum brightness difference and the maximum chromaticity difference of the display screen. By adopting the method, the crease degree of the display screen can be determined, so that the corresponding relation between the bending times of the display screen and the crease degree of the bending area can be established, and a user can not feel the existence of the crease before the bending times reach the set times.

Description

Method and device for determining crease degree of display screen

Technical Field

The application relates to the technical field of display, in particular to a method and a device for determining crease degree of a display screen.

Background

With the development of AMOLED (Active Matrix Organic Light Emitting Diode) technology, an OLED (Organic Light Emitting Diode) display screen is changed from a hard screen substrate to a PI (Polyimide) flexible substrate. The OLED display screen adopting the PI flexible substrate is flexible and can be folded and curled.

After the OLED display screen is bent for multiple times, creases appear in the bent area. And the crease will deepen with the increase of the bending times.

However, there is no suitable crease quantification method, and the degree of crease in the bending area cannot be evaluated.

Disclosure of Invention

In view of the above, it is desirable to provide a method, an apparatus, a computer device, and a storage medium for determining a degree of crease of a display screen, which can quantify the crease.

A method of determining a degree of creasing of a display screen, the method comprising:

acquiring brightness values and chromatic values of a plurality of test points when the display screen presents the same image, wherein the distribution areas of the plurality of test points comprise bendable areas of the display screen;

determining a maximum luminance difference and a maximum chrominance difference of the display screen based on the luminance value and the chrominance value;

and determining the crease degree of the bendable region based on the maximum brightness difference and the maximum chromaticity difference of the display screen.

According to the method for determining the crease degree of the display screen, the brightness values and the chromatic values of the plurality of test points when the display screen presents the same image are obtained, the distribution areas of the plurality of test points comprise the bendable areas of the display screen, and the difference of the bendable areas of the display screen in brightness and chromaticity can be known. The whole display screen is flat before bending, the distribution area of the bendable area is smaller, and the brightness value and the chromatic value of the display screen when the same image is displayed on the display screen should be the same theoretically. However, after the display screen is bent, the bendable region has wrinkles, so that the viewing angle is changed, the direction of light emitted from the display screen is changed, and the brightness and the chromaticity are different from those of the original display screen. The method comprises the steps of firstly determining the maximum brightness difference and the maximum chromaticity difference of a display screen based on the brightness values and the chromaticity values of a plurality of test points when the display screen presents the same image, and then determining the crease degree of a bendable region based on the maximum brightness difference and the maximum chromaticity difference of the display screen. The maximum difference of the display screen in brightness and chromaticity is utilized to determine the crease degree of the bendable region, the influence of the crease on the display screen display image can be better reflected, the crease degree of the bendable region can be accurately evaluated, and then the corresponding relation between the bending times of the display screen and the crease degree of the bendable region can be established, so that a user can not feel the existence of the crease before the bending times reaches the set times.

In one embodiment, the test points form at least one test combination, the test points in the same test combination are arranged at intervals along a first direction, and the first direction forms an included angle with the folding line direction of the display screen.

The test points in the same test combination are arranged at intervals along the first direction, and the first direction forms an included angle with the crease direction of the display screen, so that the brightness value and the chromatic value of each region which are affected by the bending of the display screen and are different on the display screen can be obtained, the condition that the display screen is affected by the bending of the display screen can be accurately known, and the crease degree of the display screen can be accurately determined.

In one embodiment, the determining the maximum luminance difference and the maximum chrominance difference of the display screen based on the luminance value and the chrominance value includes:

determining a maximum luminance difference and a maximum chrominance difference for each test combination based on the luminance values and the chrominance values;

when a plurality of test combinations are provided, determining the maximum value of the maximum brightness differences of the test combinations as the maximum brightness difference of the display screen, and determining the maximum value of the maximum chromaticity differences of the test combinations as the maximum chromaticity difference of the display screen;

and when one test combination is adopted, determining the maximum brightness difference of the test combination as the maximum brightness difference of the display screen, and determining the maximum chromaticity difference of the test combination as the maximum chromaticity difference of the display screen.

When only one test combination is available, the maximum brightness difference of the test combination is the maximum brightness difference of the display screen; and testing the maximum chromaticity difference of the combination, namely the maximum chromaticity difference of the display screen. When a plurality of test points form a test combination, the maximum brightness difference of the test combination is the maximum brightness difference of the display screen; and testing the maximum chromaticity difference of the combination, namely the maximum chromaticity difference of the display screen.

In one embodiment, the determining the maximum luminance difference and the maximum chrominance difference for each test combination based on the luminance value and the chrominance value includes:

determining the brightness difference between every two test points in the same test combination, and determining the maximum value in the brightness difference as the maximum brightness difference of the test combination;

and in the same test combination, determining the chromaticity difference between every two test points, and determining the maximum value in the chromaticity differences as the maximum chromaticity difference of the test combination.

Obtaining the maximum brightness difference of the test combination by determining the brightness difference between every two test points; and obtaining the maximum chromaticity difference of the test combination by determining the chromaticity difference between every two test points.

In one embodiment, the determining the degree of the crease of the bendable region based on the maximum luminance difference and the maximum chrominance difference of the display screen includes:

determining the crease extent phi of the bendable region by adopting the following formula:

φ＝k1*ΔL+k4*Δxy；

wherein k1 is a correlation coefficient between the maximum luminance difference of the display screen and the folding degree of the bendable region, Δ L is the maximum luminance difference of the display screen, k4 is a correlation coefficient between the maximum chromaticity difference of the display screen and the folding degree of the bendable region, and Δ xy is the maximum chromaticity difference of the display screen.

And multiplying and summing the maximum brightness difference and the maximum chromaticity difference of the display screen by the corresponding correlation coefficients, so as to obtain the crease degree of the bendable region.

In one embodiment, in the same test combination, the most middle test point is located on a central line of the bendable region extending along the crease direction of the display screen, and the test points except the most middle test point are arranged symmetrically relative to the center of the most middle test point.

In the same test combination, the middle test point is positioned on the central line of the bendable region extending along the crease direction of the display screen, and the test points except the middle test point are centrosymmetric relative to the middle test point, so that the brightness value and the chromatic value of each region which are influenced by the bending of the display screen from large to small on the display screen can be obtained, the condition that the display screen is influenced by the bending of the display screen can be more accurately known, and the crease degree of the display screen can be accurately determined.

In one embodiment, the maximum chromaticity difference of the test combination comprises a first maximum chromaticity difference and a second maximum chromaticity difference; the determining a maximum luminance difference and a maximum chrominance difference for each test combination based on the luminance value and the chrominance value comprises:

determining the brightness difference between the middle test point and each test point except the middle test point in the same test combination, and determining the maximum value in the brightness difference as the maximum brightness difference of the test combination;

determining a first chromaticity difference between the middle test point and each test point except the middle test point in the same test combination, and determining the maximum value of the first chromaticity differences as a first maximum chromaticity difference of the test combination;

and in the same test combination, determining second chromaticity differences between the two test points which are arranged in the central symmetry mode, and determining the maximum value of the second chromaticity differences as the second maximum chromaticity difference of the test combination.

The middle test point is located on a central line extending along the crease direction of the display screen in the bendable region, the region where the central line is located is generally most affected by bending of the display screen, the middle test point is used as a reference, the chromaticity difference between other test points and the middle test point is determined, the difference of the bendable region in chromaticity can be determined more accurately, and the calculation amount is less.

In one embodiment, the maximum chromaticity difference of the display screen comprises a first maximum chromaticity difference and a second maximum chromaticity difference, the first maximum chromaticity difference of the display screen is determined based on the first maximum chromaticity difference of the test combination, and the second maximum chromaticity difference of the display screen is determined based on the second maximum chromaticity difference of the test combination;

the determining the crease degree of the bendable region based on the maximum brightness difference and the maximum chromaticity difference of the display screen comprises:

φ＝k1*ΔL+k2*Δxy1+k3*Δxy2；

the display screen comprises a bendable region, a display screen body, a display screen, a k1, a Δ xy1, a k3 and a Δ xy2, wherein the k1 is a correlation coefficient between the maximum brightness difference of the display screen and the crease degree of the bendable region, the Δ L is the maximum brightness difference of the display screen, the k2 is a correlation coefficient between the first maximum chromaticity difference of the display screen and the crease degree of the bendable region, the Δ xy1 is the first maximum chromaticity difference of the display screen, the k3 is a correlation coefficient between the second maximum chromaticity difference of the display screen and the crease degree of the bendable region, and the Δ xy2 is the second maximum chromaticity difference of the display screen.

The maximum brightness difference and the two maximum chromaticity differences of the display screen are multiplied and summed with the corresponding correlation coefficients, and then the crease degree of the bendable region can be obtained.

In one embodiment, the distribution region of the plurality of test points further comprises an adjacent region adjacent to the bendable region.

The distribution areas of the plurality of test points simultaneously comprise the bendable area and the adjacent area, so that the difference between the bendable area and the adjacent area in brightness and chromaticity can be accurately determined, and the crease degree of the bendable area can be accurately evaluated.

A display screen crease degree determination apparatus, the apparatus comprising:

the device comprises an acquisition module, a display module and a display module, wherein the acquisition module is used for acquiring the brightness value and the chromatic value of a plurality of test points when the display screen presents the same image, and the distribution area of the test points comprises a bendable area of the display screen;

a difference value determining module, configured to determine a maximum luminance difference and a maximum chrominance difference of the display screen based on the luminance value and the chrominance value;

and the degree determining module is used for determining the crease degree of the bendable region based on the maximum brightness difference and the maximum chromaticity difference of the display screen.

According to the device for determining the crease degree of the display screen, the brightness value and the chromatic value of the plurality of test points when the display screen presents the same image are obtained, the distribution areas of the plurality of test points comprise the bendable areas of the display screen, and the difference of the bendable areas of the display screen in brightness and chromaticity can be known. The whole display screen is flat before bending, the distribution area of the bendable area is smaller, and the brightness value and the chromatic value of the display screen when the same image is displayed on the display screen should be the same theoretically. However, after the display screen is bent, the bendable region has wrinkles, so that the viewing angle is changed, the direction of light emitted from the display screen is changed, and the brightness and the chromaticity are different from those of the original display screen. The method comprises the steps of firstly determining the maximum brightness difference and the maximum chromaticity difference of a display screen based on the brightness values and the chromaticity values of a plurality of test points when the display screen presents the same image, and then determining the crease degree of a bendable region based on the maximum brightness difference and the maximum chromaticity difference of the display screen. The maximum difference of the display screen in brightness and chromaticity is utilized to determine the crease degree of the bendable region, the influence of the crease on the display screen display image can be better reflected, the crease degree of the bendable region can be accurately evaluated, and then the corresponding relation between the bending times of the display screen and the crease degree of the bendable region can be established, so that a user can not feel the existence of the crease before the bending times reaches the set times.

Drawings

FIG. 1 is a diagram illustrating an exemplary embodiment of a method for determining a degree of creasing in a display screen;

FIG. 2 is a diagram illustrating an application environment of the method for determining the degree of folding of a display screen according to another embodiment;

FIG. 3 is a diagram illustrating an exemplary embodiment of a method for determining a degree of folding of a display screen;

FIG. 4 is a schematic flow chart illustrating a method for determining a degree of creasing of a display screen in accordance with an exemplary embodiment;

FIG. 5 is a schematic illustration of the location of the crease distribution in one embodiment;

FIG. 6 is a schematic view showing a process of determining the degree of folding of the display screen according to another embodiment;

FIG. 7 is a diagram illustrating test point distribution locations in an embodiment;

FIG. 8 is a schematic flowchart of a method for determining the degree of crease in a display screen according to yet another embodiment;

FIG. 9 is a schematic view showing a flowchart of a method for determining the degree of folding of a display screen according to still another embodiment;

FIG. 10 is a schematic diagram of test point distribution positions in another embodiment;

FIG. 11 is a block diagram showing the structure of a display screen crease degree determination device according to an embodiment;

FIG. 12 is a diagram illustrating an internal structure of a computer device according to an embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

The method for determining the crease degree of the display screen can be applied to application environments shown in fig. 1 to 3. The display 104 of the terminal 102 is flexible and can be folded along a transverse midline of the terminal 102 (as shown in fig. 1), folded along a longitudinal midline of the terminal 102 (as shown in fig. 2), and folded along a plurality of straight lines parallel to a same side line of the terminal 102 (as shown in fig. 3). The area of the display screen 104 that is bent may appear creased after being folded in half a number of times. With the increase of the bending times, the crease marks become more and more obvious, and the use of the user is influenced. In order to ensure the use effect of the user, the crease on the display screen 104 needs to be quantified, and the crease degree of the bending area of the display screen 104 is determined, so that the corresponding relationship between the bending frequency of the display screen and the crease degree of the bending area can be established, and the user can not feel the existence of the crease before the bending frequency reaches the set frequency.

Specifically, the brightness values and the chromatic values of a plurality of test points when the display screen presents the same image are obtained, and the distribution areas of the plurality of test points comprise bendable areas of the display screen; determining a maximum brightness difference and a maximum chroma difference of the display screen based on the brightness value and the chroma value; and determining the crease degree of the bendable region based on the maximum brightness difference and the maximum chromaticity difference of the display screen.

The terminal 102 may be, but is not limited to, various personal computers, notebook computers, smart phones, tablet computers, and portable wearable devices, and the display screen 104 may be an OLED display screen using a PI flexible substrate.

In one embodiment, as shown in fig. 4, there is provided a method for determining a crease degree of a display screen, comprising the steps of:

step S402, acquiring brightness values and chromatic values of a plurality of test points when the same image is displayed on a display screen.

The distribution area of the plurality of test points comprises a bendable area of the display screen.

Each test point corresponds to an area on the display screen, and the corresponding areas of different test points on the display screen are different. The brightness value of the test point is the average brightness value of the corresponding area, and the chromatic value of the test point is the average chromatic value of the corresponding area.

Illustratively, the distribution region of the plurality of test points further includes an adjacent region adjacent to the bendable region.

The bendable area is an area bent on the display screen, and the bendable area can be folded after the display screen is bent for many times. The adjacent area is an area adjacent to the bendable area, specifically, a part of boundary line of the adjacent area is overlapped with a part of boundary line of the bendable area, and the adjacent area does not have a crease after the display screen is bent for multiple times.

In practical application, the bendable region is a pre-designed region, and the distribution position of the bendable region on the display screen can be determined directly according to the design of the display screen. The length of the adjacent area perpendicular to the overlapping boundary line can be preset according to the detection requirement. Therefore, after the bendable region is determined, the adjacent region can be determined accordingly.

For example, as shown in fig. 5, the display screen 104 is folded along a center line, the strip regions symmetrically disposed on both sides of the center line are collectively the bendable regions 106 of the display screen 104, and the strip regions symmetrically disposed on both sides of the bendable regions 106 are the adjacent regions 108.

Specifically, the luminance values and the chrominance values of at least the bendable region 106 and the adjacent region 108 when the display screen 104 presents a certain image may be detected by using a testing device, the luminance values of the plurality of testing points may be obtained from the luminance values of the bendable region 106 and the adjacent region 108 according to the positions of the plurality of testing points on the bendable region 106 and the adjacent region 108, and the chrominance values of the plurality of testing points may be obtained from the chrominance values of the bendable region 106 and the adjacent region 108.

Illustratively, the test device may include at least one of a luminance tester, a colorimeter, and an image capture device.

In this embodiment, the bendable region 106 and the adjacent region 108 are adjacent to each other, and when the display screen presents the same image, the luminance values of the test points in the bendable region 106 and the luminance values of the test points in the adjacent region 108 are theoretically the same, and the chrominance values of the test points in the bendable region 106 and the chrominance values of the test points in the adjacent region 108 are also theoretically the same. However, the viewing angle may be changed due to the crease, the bendable region 106 may have the crease after the display screen 104 is bent for multiple times, and the adjacent region 108 may not have the crease after the display screen 104 is bent for multiple times, so that the luminance values of the test points in the bendable region 106 and the luminance values of the test points in the adjacent region 108 are actually different, and the chromaticity values of the test points in the bendable region 106 and the chromaticity values of the test points in the adjacent region 108 are also actually different. By obtaining the brightness value and the chromatic value of the test point in the bendable region 106 and the adjacent region 108, the difference between the brightness and the chromatic value of the bendable region 106 and the adjacent region 108 is determined, and the crease degree of the bendable region 106 can be accurately determined.

Step S404 determines the maximum luminance difference and the maximum chrominance difference of the display screen based on the luminance value and the chrominance value.

Any two test points in the plurality of test points can form a calculation object. And obtaining the absolute value of the brightness difference between the two test points in the calculation object based on the brightness values of the two test points in the calculation object. The maximum brightness value of the display screen may be the maximum value of the absolute values of the brightness differences obtained by all the calculation objects, or may be the maximum value of the absolute values of the brightness differences obtained by part of the calculation objects.

Similarly, based on the colorimetric values of two test points in a calculation object, the absolute value of the colorimetric difference between the two test points in the calculation object is obtained. The maximum chromaticity difference of the display screen may be the maximum value of the absolute chromaticity difference values obtained by all the calculation objects, or may be the maximum value of the absolute chromaticity difference values obtained by some calculation objects.

For example, the plurality of test points includes test point a, test point B, test point C, test point D, and test point E.

If all the calculation objects are selected, the maximum brightness difference of the display screen can be the maximum value of the absolute value of the brightness difference between the test point A and the test point B, the absolute value of the brightness difference between the test point A and the test point C, the absolute value of the brightness difference between the test point A and the test point D, the absolute value of the brightness difference between the test point A and the test point E, the absolute value of the brightness difference between the test point B and the test point C, the absolute value of the brightness difference between the test point B and the test point E, the absolute value of the brightness difference between the test point C and the test point D, the absolute value of the brightness difference between the test point C and the test point E, and the absolute value of the brightness difference between the test point D and the test point E. The maximum chromaticity difference of the display screen may be a maximum value among a chromaticity difference between the test point a and the test point B, an absolute value of a chromaticity difference between the test point a and the test point C, an absolute value of a chromaticity difference between the test point a and the test point D, an absolute value of a chromaticity difference between the test point a and the test point E, an absolute value of a chromaticity difference between the test point B and the test point C, an absolute value of a chromaticity difference between the test point B and the test point D, an absolute value of a chromaticity difference between the test point C and the test point E, and an absolute value of a chromaticity difference between the test point D and the test point E.

If part of test objects are selected, the maximum brightness difference of the display screen can be the maximum value of the absolute value of the brightness difference between the test point A and the test point C, the absolute value of the brightness difference between the test point B and the test point C, the absolute value of the brightness difference between the test point C and the test point D, and the absolute value of the brightness difference between the test point C and the test point E. The maximum chromaticity difference of the display screen may be the maximum value among the absolute value of the luminance difference between the test point a and the test point C, the absolute value of the luminance difference between the test point B and the test point C, the absolute value of the chromaticity difference between the test point C and the test point D, and the absolute value of the chromaticity difference between the test point C and the test point E, or the maximum value among the absolute value of the chromaticity difference between the test point a and the test point E, and the absolute value of the chromaticity difference between the test point B and the test point D.

Specifically, the absolute value of the brightness difference between the selected test points is determined based on the brightness values of the plurality of test points when the same image is displayed on the display screen, and then the maximum value is selected from the determined absolute values of the brightness difference to serve as the maximum brightness difference of the display screen. Similarly, the absolute value of the chromaticity difference between the selected test points is determined based on the chromaticity values of the plurality of test points when the same image is displayed on the display screen, and then the maximum value is selected from the determined absolute values of the chromaticity differences to serve as the maximum chromaticity difference of the display screen.

Step S406, determining the crease degree of the bendable region based on the maximum brightness difference and the maximum chromaticity difference of the display screen.

The degree of the crease is a parameter for measuring the depth of the crease, and the influence of the crease on the consistency of the image displayed on the display screen can be quantified.

Specifically, a relational expression between the maximum luminance difference and the maximum chromaticity difference and the degree of the fold is obtained, and then the maximum luminance difference and the maximum chromaticity difference of the display screen are substituted into the relational expression, so that the degree of the fold of the bendable region can be obtained.

According to the method for determining the crease degree of the display screen, the brightness values and the chromatic values of the plurality of test points when the display screen presents the same image are obtained, the distribution areas of the plurality of test points comprise the bendable areas of the display screen, and the difference of the bendable areas of the display screen in brightness and chromaticity can be known. The whole display screen is flat before bending, the distribution area of the bendable area is smaller, and the brightness value and the chromatic value of the display screen when the same image is displayed on the display screen should be the same theoretically. However, after the display screen is bent, the bendable region has wrinkles, so that the viewing angle is changed, the direction of light emitted from the display screen is changed, and the brightness and the chromaticity are different from those of the original display screen. The method comprises the steps of firstly determining the maximum brightness difference and the maximum chromaticity difference of a display screen based on the brightness values and the chromaticity values of a plurality of test points when the display screen presents the same image, and then determining the crease degree of a bendable region based on the maximum brightness difference and the maximum chromaticity difference of the display screen. Therefore, the maximum difference of the brightness and the chromaticity of the display screen is utilized to determine the crease degree of the bendable region, the influence of the crease on the display image of the display screen can be better reflected, the crease degree of the bendable region can be accurately evaluated, and the corresponding relation between the bending times of the display screen and the crease degree of the bendable region can be further established, so that a user can not feel the existence of the crease before the bending times reach the set times.

In one embodiment, this step S402 includes: acquiring a picture of a display screen when the display screen presents an image; carrying out edge extraction on the photo, and intercepting a display screen image from the photo based on an edge extraction result; and acquiring the brightness values and the colorimetric values of the plurality of test points from the display screen image based on the distribution positions of the plurality of test points in the display screen.

In practical application, the area of the area where the test point is located is small, and it is difficult to only shoot the area where the test point is located, so that the brightness value and the chromatic value of the test point cannot be directly obtained. In this embodiment, by obtaining a picture of the whole display screen when a certain image is presented, the difference between the display screen and the surrounding environment can be utilized, an edge extraction algorithm is adopted to determine the position of the edge of the display screen in the picture, and based on the position of the edge of the display screen in the picture, the image of the display screen is intercepted from the picture, then based on the distribution positions of a plurality of test points in the display screen, each test point can be found in the image of the display screen, and further, the brightness value and the chromatic value of the test point are obtained.

Specifically, the distance between the shooting device of the picture and the display screen is a set distance so as to ensure that the shooting device can shoot the whole body picture of the display screen.

Illustratively, the projection of the shooting center of the shooting device on the display screen coincides with the center of the bendable region. The shooting equipment is just shooting at the center of the bendable area, and the whole body shot of the display screen is favorably shot.

In one embodiment, as shown in fig. 6, there is provided a method for determining a crease degree of a display screen, including the steps of:

step S602, obtaining luminance values and chrominance values of the plurality of test points when the display screen presents the same image.

The distribution area of the plurality of test points comprises a bendable area of the display screen. Illustratively, the distribution region of the plurality of test points further includes an adjacent region adjacent to the bendable region.

In the present embodiment, as shown in fig. 7, a plurality of test points 100 form a test combination, and the test points 100 in the same test combination are arranged at intervals along a first direction (indicated by an arrow in fig. 7), and the first direction forms an angle with the folding line direction of the display screen 104. For example, the first direction may form an angle of 30 °, 60 °, and 90 ° with the folding line direction of the display screen 104, and the angle of 90 ° is taken as an example in this embodiment for description, that is, the first direction is perpendicular to the folding line direction of the display screen 104.

In the same test combination, the middle test point 100 is located on the middle line (indicated by the dotted line in fig. 7) of the bendable region 106 extending along the folding line direction of the display screen 104, and the test points 100 except for the middle test point 100 are arranged symmetrically with respect to the middle test point 100. At this time, the number of the plurality of test points 100 is an odd number, such as 3, 5, 7, etc.

Illustratively, the test point 100 in the test combination is located on a centerline extending in a second direction that is perpendicular to the direction of the fold of the display screen 104.

In practical applications, the bendable region 106 is generally a bar-shaped region, a length direction of the bar-shaped region is a folding direction of the display screen 104, and the bendable region 106 penetrates through the display screen 104 in the length direction of the bar-shaped region. Typically, the area of the center line of the display screen 104 extending in the direction of the crease is most affected by the bending of the display screen 104, and the display screen 104 is less affected by the bending of the display screen 104 in the direction away from the center line.

The test points 100 in the same test combination are arranged at intervals along the first direction, and the first direction forms an included angle with the folding line direction of the display screen 104, so that the brightness value and the chromatic value of each region of the display screen 104, which is affected by the bending of the display screen 104, can be obtained, the situation that the display screen 104 is affected by the bending of the display screen 104 can be accurately known, and the folding line degree of the display screen 104 can be accurately determined.

In the same test combination, the middle test point 100 is located on the central line of the bendable region 106 extending along the folding line direction of the display screen 104, and the test points 100 except the middle test point 100 are centrosymmetric with respect to the middle test point 100, so that the brightness value and the chromatic value of each region of the display screen 104 affected by the bending of the display screen 104 from large to small can be obtained, the condition that the display screen 104 is affected by the bending of the display screen 104 can be known more accurately, and the folding line degree of the display screen 104 can be determined accurately.

Illustratively, in the same test combination, the distance between two adjacent test points 100 in the bendable region 106 is smaller than the distance between two adjacent test points 100 in the adjacent region 108.

For example, the length of the bendable region 106 in the second direction is L, the distance between two adjacent test points 100 in the bendable region 106 is L/4, and the distance between two adjacent test points 100 in the adjacent region 108 is L/2. Thus, there are five test points 100 in the bendable region 106, and the distances between the test points and the middle line of the display screen 104 extending along the folding direction of the display screen 104 are L/2, L/4, 0, L/4, and L/2, respectively. At least two test points 100 are located in the adjacent area 108, wherein the distance between the two test points 100 closest to the bendable area 106 and the center line of the display screen 104 extending along the folding direction of the display screen 104 is L.

In other embodiments, the test points 100 in the same test combination are uniformly arranged along the second direction, and the distance between two adjacent test points 100 is constant.

For example, the width of the bendable region 106 is L, and the distance between two adjacent test points 100 is L/4. Thus, there are five test points 100 in the bendable region 106, and the distances between the test points and the middle line of the display screen 104 extending along the folding direction of the display screen 104 are L/2, L/4, 0, L/4, and L/2, respectively. At least two test points 100 are located in the adjacent region 108, wherein the distance between the two test points 100 closest to the bendable region 106 and the center line of the display screen 104 extending along the folding direction of the display screen 104 is L × 3/4.

For another example, as shown in fig. 7, the width of the bendable region 106 is L, and the distance between two adjacent test points 100 is L/2. Thus, three test points 100 are located in the bendable region 106, and distances from a center line of the display screen 104 extending along the folding direction of the display screen 104 are L/2, 0, and L/2, respectively. At least two test points 100 are located in the adjacent area 108, wherein the distance between the two test points 100 closest to the bendable area 106 and the center line of the display screen 104 extending along the folding direction of the display screen 104 is L.

Illustratively, the test point 100 may be any one of a circular region, a rectangular region, and an annular region.

Specifically, the longest distance within the test point 100 is 0.01 times to 0.2 times the length of the bendable region 106 in the second direction. By defining the maximum distance within the test point 100 by the length of the bendable region 106 in the second direction, it is possible to avoid that the test point 100 is too large in size to interfere with an adjacent test point 100.

For example, the length of the bendable region 106 in the second direction is L, and the longest distance within each test point is 0.1L. If the test site is a circular area, the test site has a diameter of 0.1 × L. If the test points are rectangular areas, the length of the test points is 0.1 × L.

Step S604, in the same test combination, determining the brightness difference between the middle test point and each test point except the middle test point, and determining the maximum value in the brightness difference as the maximum brightness difference of the test combination.

Specifically, the step S604 may include:

the maximum luminance difference Δ L for a test combination is determined using the following formula:

wherein, the number of the test points is 2 × i +1, L₁、L₂、……、L_i、L_i+1、L_i+2、……、L_2*i、L_2*i+1And sequentially representing the brightness value of each test point.

In this embodiment, the central test point 100 is located on a central line of the bendable region 106 extending along the folding direction of the display screen 104, the area where this central line is located is usually most affected by the bending of the display screen 104, and the absolute value of the luminance difference between the other test points 100 and the central test point 100 is determined by using the central test point 100 as a reference, so that the difference between the bendable region 106 and the adjacent region 108 in luminance can be determined more accurately, and the calculation amount is less. The brightness difference absolute value is divided by the brightness value of the middle test point 100 for homogenization, so that the influence of the brightness of the image displayed by the display screen 106 on the subsequent determination of the crease degree of the bendable region can be eliminated, and the accuracy of determining the crease degree of the bendable region is improved. The calculated maximum luminance difference is divided by 0.004, and the maximum luminance difference can be converted into a unit of expression of the luminance difference that can be recognized just by the human face.

In addition, only one test combination is provided, so that the maximum brightness difference of the test combination is the maximum brightness difference of the display screen.

Step S606, in the same test combination, determining a first chromaticity difference between the middle test point and each test point except the middle test point, and determining a maximum value in the first chromaticity differences as a first maximum chromaticity difference of the test combination.

The step S606 may be executed after the step S604, may be executed simultaneously with the step S604, or may be executed before the step S604.

Specifically, the step S606 includes:

the first maximum chromaticity difference Δ xy1 for one test combination was determined using the following formula:

wherein, the number of the test points is 2 × i +1, x₁And y₁、x₂And y₂、……、x_iAnd y_i、x_i+1And y_i+1、x_i+2And y_i+2、……、x_2*iAnd y_2*i、x_2*i+1And y_2*i+1And sequentially obtaining the colorimetric values of the test points.

In this embodiment, x and y are coordinate values on the chromaticity diagram, and may represent chromaticity values. Illustratively, the chromaticity diagram may be CIE1931 or CIE 1976.

The central test point 100 is located on a central line of the bendable region 106 extending along the folding direction of the display screen 104, the area of the central line is usually most affected by the folding of the display screen 104, and the chromaticity difference between the other test points 100 and the central test point 100 is determined by taking the central test point 100 as a reference, so that the difference of the bendable region 106 in chromaticity can be determined more accurately, and the calculation amount is less. The maximum chroma difference calculated is divided by 0.004, and the maximum chroma difference can be converted into a unit of representing the chroma difference which can be just recognized by the human face.

In addition, only one test combination is provided, so that the first maximum chromaticity difference of the test combination is the first maximum chromaticity difference of the display screen.

Step S608, in the same test combination, determining a second chromaticity difference between two test points that are arranged in central symmetry, and determining a maximum value in the second chromaticity difference as a second maximum chromaticity difference of the test combination.

Specifically, the step S608 includes:

the second maximum chromaticity difference Δ xy2 for one test combination was determined using the following formula:

In this embodiment, the central test point 100 is located on a central line of the bendable region 106 extending along the folding line direction of the display screen 104, the area where the central line is located is usually most affected by the bending of the display screen 104, the test points 100 except the central test point 100 are arranged in a central symmetry manner with respect to the central test point 100, the chromaticity values of the two test points arranged in the central symmetry manner should be the same theoretically, the chromaticity difference between the two test points arranged in the central symmetry manner is determined, the difference in chromaticity between the two test points arranged in the central symmetry manner can be avoided being ignored under special circumstances, and the accuracy of determining the folding line degree of the bendable region is improved. The maximum chroma difference calculated is divided by 0.004, and the maximum chroma difference can be converted into a unit of representing the chroma difference which can be just recognized by the human face.

In addition, only one test combination is provided, so that the second maximum color difference value of the test combination is the second maximum color difference of the display screen.

Step S610, determining a crease degree of the bendable region based on the maximum luminance difference, the first maximum chromaticity difference, and the second maximum chromaticity difference of the display screen.

Specifically, the step S610 includes:

determining the crease degree phi of the bendable region by adopting the following formula:

φ＝k1*ΔL+k2*Δxy1+k3*Δxy2；

wherein k1 is a correlation coefficient between the maximum brightness difference of the display screen and the crease degree of the bendable region, Δ L is the maximum brightness difference of the display screen, k2 is a correlation coefficient between the first maximum chromaticity difference of the display screen and the crease degree of the bendable region, Δ xy1 is the first maximum chromaticity difference of the display screen, k3 is a correlation coefficient between the second maximum chromaticity difference of the display screen and the crease degree of the bendable region, and Δ xy2 is the second maximum chromaticity difference of the display screen.

For example, the maximum luminance difference and the maximum chromaticity difference of the display screen and the degree of the crease of the bendable region may be determined as follows:

firstly, displaying images on the display screens with different bending times to obtain the crease degree of the bendable area of each display screen which is artificially judged.

Wherein, the crease degree can be between 0 and 100.

For example, a display screen with ten thousand times of bending is displayed as an image, and the degree of the crease of the bendable region of the display screen is artificially determined to be 20; displaying an image on a display screen with twenty-thousand bending times, and manually judging that the crease degree of a bendable area of the display screen is 50; the display screen with the bending times of thirty-thousand times is displayed with an image, and the crease degree of the bendable area of the display screen is judged to be 90 manually.

And secondly, acquiring the brightness values and the chromatic values of a plurality of test points of each display screen.

The brightness value of each test point of the same display screen is the brightness value when the display screen presents the same image, and the chromatic value of each test point of the same display screen is the chromatic value when the display screen presents the same image. Different display screens may present the same image or different images.

And thirdly, determining the maximum brightness difference, the first maximum chromaticity difference and the second maximum chromaticity difference of each display screen based on the plurality of test points, the brightness values and the chromaticity values of the display screens.

And fourthly, fitting a relational expression among the maximum brightness difference, the first maximum chromaticity difference and the second maximum chromaticity difference of the display screen and the crease degree of the bendable region by taking the maximum brightness difference, the first maximum chromaticity difference and the second maximum chromaticity difference of the same display screen as independent variables and manually judging the crease degree of the bendable region of the display screen as dependent variables, so as to obtain the correlation coefficients between the maximum brightness difference and the maximum chromaticity difference of the display screen and the crease degree of the bendable region.

In one embodiment, as shown in fig. 8, there is provided a method for determining a crease degree of a display screen, comprising the steps of:

step S802, acquiring brightness values and chromatic values of a plurality of test points when the same image is displayed on a display screen.

In this embodiment, a plurality of test points form a test combination, the test points in the same test combination are arranged at intervals along a first direction, and the first direction forms an included angle with the crease line direction of the display screen. Illustratively, the first direction is 90 ° from the display screen's crease direction, i.e. the first direction is perpendicular to the display screen's crease direction.

Illustratively, in the same test combination, the most middle test point is located on a central line of the bendable region extending along the crease direction of the display screen, and the test points except the most middle test point are arranged symmetrically relative to the center of the most middle test point.

In other embodiments, in the same test combination, the central test point is located on a central line of the bendable region extending along the folding line direction of the display screen, and the test points except for the central test point are arranged in an asymmetric distribution on two sides of the central test point.

Step S804, in the same test combination, determining the brightness difference between every two test points, and determining the maximum value of the brightness differences as the maximum brightness difference of the test combination.

Specifically, the step S804 may include:

In this embodiment, the brightness difference between every two test points is determined, the brightness difference between any two test points is not omitted, and the difference between the bendable region and the adjacent region in brightness can be accurately determined. The middle test point is located on a central line extending along the crease direction of the display screen in the bendable region, the region where the central line is located is usually affected most by folding, brightness difference is divided by the brightness value of the middle test point 100 to be normalized, the influence of brightness of the display image displayed on the display screen 106 on the subsequent crease degree determination of the bendable region can be eliminated, and the accuracy of determining the crease degree of the bendable region is improved.

In addition, a test combination is formed by a plurality of test points, so that the maximum brightness difference of the test combination is the maximum brightness difference of the display screen.

Step S806, in the same test combination, determining the chromaticity difference between every two test points, and determining the maximum value of the chromaticity differences as the maximum chromaticity difference of the test combination.

The step S806 may be executed after the step S804, or may be executed simultaneously with the step S804, or may be executed before the step S804.

Specifically, the step S806 includes:

the maximum chromaticity difference Δ xy for one test combination is determined using the following formula:

In this embodiment, the chromaticity difference between every two test points is determined, the chromaticity difference between any two test points is not omitted, and the difference of the bendable region in chromaticity can be accurately determined.

In addition, a test combination is formed by a plurality of test points, so that the maximum chromaticity difference of the test combination is the maximum chromaticity difference of the display screen.

Step S808, determining the crease degree of the bendable region based on the maximum brightness difference and the maximum chromaticity difference of the display screen.

Specifically, the step S808 includes:

φ＝k1*ΔL+k4*Δxy；

wherein k1 is a correlation coefficient between the maximum brightness difference of the display screen and the crease degree of the bendable region, Δ L is the maximum brightness difference of the display screen, k4 is a correlation coefficient between the maximum chromaticity difference of the display screen and the crease degree of the bendable region, and Δ xy is the maximum chromaticity difference of the display screen.

And thirdly, determining the maximum brightness difference and the maximum chroma difference of each display screen based on the plurality of test points, the brightness values and the chroma values of the display screen.

And fourthly, taking the maximum brightness difference and the maximum chromaticity difference of the same display screen as independent variables, manually judging the crease degree of the bendable region of the display screen as dependent variables, and fitting a relational expression between the maximum brightness difference and the maximum chromaticity difference and the crease degree of the bendable region, so as to obtain the correlation coefficients between the maximum brightness difference and the maximum chromaticity difference of the display screen and the crease degree of the bendable region.

In one embodiment, as shown in fig. 9, there is provided a method for determining a crease degree of a display screen, including the steps of:

step S902, obtaining brightness values and chrominance values of the plurality of test points when the same image is displayed on the display screen.

In this embodiment, as shown in fig. 10, a plurality of test points 100 form a plurality of test combinations, the plurality of test combinations are arranged at intervals along a folding line direction (indicated by an arrow in fig. 10) of the display screen, and the test points 100 in the same test combination are arranged at intervals along a first direction, and the first direction forms an angle with the folding line direction of the display screen. Illustratively, the first direction is 90 ° from the display screen's crease direction, i.e. the first direction is perpendicular to the display screen's crease direction.

In practical applications, the bendable region 106 is generally a bar-shaped region, a length direction of the bar-shaped region is a folding direction of the display screen 104, and the bendable region 106 penetrates through the display screen 104 in the length direction of the bar-shaped region. The plurality of test combinations are arranged at intervals along the crease direction of the display screen, so that the crease degrees of different positions on the display screen 104 can be obtained, and the accuracy of determining the crease degree of the bendable region is improved.

Illustratively, the plurality of test combinations are uniformly arranged along the crease direction of the display screen, and the distance between two adjacent test combinations is a fixed value.

For example, the length of the bendable region 106 in the direction of the fold of the display screen is S, and the distance between two adjacent test combinations is S/5. Assuming that the plurality of test points 100 includes seven test combinations, distances between each test combination and a central line extending in a direction perpendicular to the folding direction in the display screen 104 are S3/5, S2/5, S/5, 0, S/5, S2/5, and S3/5, respectively.

Illustratively, the test point of the center-most test combination is located on a centerline of the display screen 104 extending in a direction perpendicular to the direction of the fold.

Illustratively, the distance between the test combination and the edge of the display screen 104 extending in a direction perpendicular to the direction of the fold is greater than 1/10 for the length of the display screen 104 in the direction of the fold.

The edge of the display screen 104 may be a curved surface, and the viewing angle may also change when the display screen 104 is not bent, which may cause an inaccurate degree of the determined crease of the bendable region if the test points are provided. The distance between the test combination and the edge of the display screen 104 extending in the direction perpendicular to the folding line direction is greater than 1/10 of the length of the display screen 104 in the folding line direction, so that the test points can be prevented from being arranged at the edge of the display screen 104, and the accuracy of determining the folding line degree of the bendable region can be improved.

Step S904 determines the maximum luminance difference and the maximum chrominance difference of each test combination based on the luminance value and the chrominance value.

In one implementation, this step S904 includes: determining the brightness difference between every two test points in the same test combination, and determining the maximum value in the brightness difference as the maximum brightness difference of the test combination; and in the same test combination, determining the chromaticity difference between every two test points, and determining the maximum value of the chromaticity differences as the maximum chromaticity difference of the test combination.

In another implementation, the maximum chromaticity difference of the test combination includes a first maximum chromaticity difference and a second maximum chromaticity difference; the step S904 includes: determining the brightness difference between the middle test point and each test point except the middle test point in the same test combination, and determining the maximum value in the brightness difference as the maximum brightness difference of the test combination; determining a first chromaticity difference between the middle test point and each test point except the middle test point in the same test combination, and determining the maximum value in the first chromaticity difference as the first maximum chromaticity difference of the test combination; and in the same test combination, determining second chromaticity differences between the two test points which are arranged in the central symmetry mode, and determining the maximum value in the second chromaticity differences as the second maximum chromaticity difference of the test combination.

In step S906, the maximum value of the maximum luminance differences of the test combinations is determined as the maximum luminance difference of the display screen.

In step S908, the maximum value of the maximum chromaticity differences of the test combinations is determined as the maximum chromaticity difference of the display screen.

The step S908 may be executed after the step S906, may be executed simultaneously with the step S906, or may be executed before the step S906.

Illustratively, when the maximum chromaticity difference of the test combination includes the first maximum chromaticity difference and the second maximum chromaticity difference, the maximum chromaticity difference of the display screen also includes the first maximum chromaticity difference and the second maximum chromaticity difference.

Accordingly, the step S908 includes: determining the maximum value in the first maximum chromaticity difference of the test combination as the first maximum chromaticity difference of the display screen; and determining the maximum value of the second maximum chromaticity difference of the test combination as the second maximum chromaticity difference of the display screen.

Step S910, determining the crease degree of the bendable region based on the maximum brightness difference and the maximum chromaticity difference of the display screen.

It should be understood that although the various steps in the flowcharts of fig. 4, 6, 8-9 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 4, 6, 8-9 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least some of the other steps.

In one embodiment, as shown in fig. 11, there is provided a display screen crease degree determination apparatus 1100, including: an obtaining module 1101, a difference determining module 1102 and a degree determining module 1103, wherein:

the obtaining module 1101 is configured to obtain luminance values and chrominance values of a plurality of test points when the display screen presents the same image, where a distribution area of the plurality of test points includes a bendable area of the display screen.

A difference determining module 1102, configured to determine a maximum luminance difference and a maximum chrominance difference of the display screen based on the luminance value and the chrominance value.

The degree determining module 1103 is configured to determine a degree of a crease of the bendable region based on the maximum luminance difference and the maximum chrominance difference of the display screen.

In one embodiment, the test points form at least one test combination, the test points in the same test combination are arranged at intervals along a first direction, and the first direction forms an included angle with the crease line direction of the display screen.

Illustratively, the difference determination module 1102 comprises a combination determination unit, a plurality of determination units and a single determination unit, wherein: a combination determination unit for determining a maximum luminance difference and a maximum chrominance difference of each test combination based on the luminance value and the chrominance value; a plurality of determination units for determining a maximum value among maximum luminance differences of the test combinations as a maximum luminance difference of the display screen and determining a maximum value among maximum chrominance differences of the test combinations as a maximum chrominance difference of the display screen when the test combinations are plural; and the single determining unit is used for determining the maximum brightness difference of the test combination as the maximum brightness difference of the display screen and determining the maximum chromaticity difference of the test combination as the maximum chromaticity difference of the display screen when the test combination is one.

In one implementation manner, the combination determining unit is configured to determine, in the same test combination, a luminance difference between every two test points, and determine a maximum value of the luminance differences as a maximum luminance difference of the test combination; and in the same test combination, determining the chromaticity difference between every two test points, and determining the maximum value of the chromaticity differences as the maximum chromaticity difference of the test combination.

Illustratively, the degree determining module 1103 is configured to determine the degree of crease φ of the bendable region using the following formula: Φ ═ k1 × Δ L + k4 × Δ xy; wherein k1 is a correlation coefficient between the maximum brightness difference of the display screen and the crease degree of the bendable region, Δ L is the maximum brightness difference of the display screen, k4 is a correlation coefficient between the maximum chromaticity difference of the display screen and the crease degree of the bendable region, and Δ xy is the maximum chromaticity difference of the display screen.

In another implementation manner, in the same test combination, the middle test point is located on a central line of the bendable region extending along the crease direction of the display screen, and the test points except for the middle test point are arranged symmetrically with respect to the center of the middle test point.

Specifically, the maximum chromaticity difference of the test combination includes a first maximum chromaticity difference and a second maximum chromaticity difference; the combination determining unit is used for determining the brightness difference between the middle test point and each test point except the middle test point in the same test combination, and determining the maximum value in the brightness difference as the maximum brightness difference of the test combination; determining a first chromaticity difference between the middle test point and each test point except the middle test point in the same test combination, and determining the maximum value in the first chromaticity difference as the first maximum chromaticity difference of the test combination; and in the same test combination, determining second chromaticity differences between the two test points which are arranged in the central symmetry mode, and determining the maximum value in the second chromaticity differences as the second maximum chromaticity difference of the test combination.

Illustratively, the maximum chromaticity difference of the display screen includes a first maximum chromaticity difference determined based on the first maximum chromaticity difference of the test combination and a second maximum chromaticity difference determined based on the second maximum chromaticity difference of the test combination; the degree determining module 1103 is configured to determine the degree of the crease φ of the bendable region by using the following formula: Φ ═ k1 × Δ L + k2 × Δ xy1+ k3 × Δ xy 2; wherein k1 is a correlation coefficient between the maximum brightness difference of the display screen and the crease degree of the bendable region, Δ L is the maximum brightness difference of the display screen, k2 is a correlation coefficient between the first maximum chromaticity difference of the display screen and the crease degree of the bendable region, Δ xy1 is the first maximum chromaticity difference of the display screen, k3 is a correlation coefficient between the second maximum chromaticity difference of the display screen and the crease degree of the bendable region, and Δ xy2 is the second maximum chromaticity difference of the display screen.

In one embodiment, the distribution region of the plurality of test points further includes an adjacent region adjacent to the bendable region.

For specific definition of the display screen crease degree determination device, reference may be made to the above definition of the display screen crease degree determination method, which is not described herein again. The modules in the display screen crease degree determination device can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.

In one embodiment, a computer device is provided, the internal structure of which may be as shown in fig. 12. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a method for determining a degree of crease in a display screen.

Those skilled in the art will appreciate that the architecture shown in fig. 12 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.

In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the steps of the above-described method embodiments when executing the computer program.

In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A method for determining the crease degree of a display screen is characterized by comprising the following steps:

2. The method of claim 1, wherein the plurality of test points form at least one test pattern, and the test points in the same test pattern are spaced apart in a first direction that is at an angle to the direction of the fold of the display.

3. The method of claim 2, wherein determining a maximum luminance difference and a maximum chrominance difference for the display screen based on the luminance value and the chrominance value comprises:

4. The method of claim 3, wherein determining a maximum luminance difference and a maximum chrominance difference for each test combination based on the luminance value and the chrominance value comprises:

5. The method according to any one of claims 1 to 4, wherein the determining the degree of the crease of the bendable region based on the maximum luminance difference and the maximum chrominance difference of the display screen comprises:

φ＝k1*ΔL+k4*Δxy；

6. The method of claim 3, wherein in the same test combination, the central test point is located on a central line of the bendable region extending in the direction of the fold of the display screen, and the test points except the central test point are arranged symmetrically with respect to the central test point.

7. The method of claim 6, wherein the maximum chroma difference of the test combination comprises a first maximum chroma difference and a second maximum chroma difference; the determining a maximum luminance difference and a maximum chrominance difference for each test combination based on the luminance value and the chrominance value comprises:

8. The method of claim 7, wherein the maximum chromaticity difference of the display screen comprises a first maximum chromaticity difference and a second maximum chromaticity difference, the first maximum chromaticity difference of the display screen being determined based on the first maximum chromaticity difference of the test combination, the second maximum chromaticity difference of the display screen being determined based on the second maximum chromaticity difference of the test combination;

φ＝k1*ΔL+k2*Δxy1+k3*Δxy2；

9. The method of any one of claims 1 to 8, wherein the distribution region of the plurality of test points further comprises an adjacent region adjacent to the bendable region.

10. A display screen crease degree determination device, characterized in that the device comprises: