An image acquisition method and an image acquisition device

Abstract

This invention discloses an image acquisition method and an image acquisition device. The image acquisition method includes: acquiring first information of the display screen in a flattened state, the first information including first position information of multiple display points on the display screen in the flattened state; acquiring second information of the display screen in a bent state, the second information including second position information of multiple display points in the bent state; determining the included angle information of each display point based on the first and second position information; and compensating the brightness information of the display points acquired in the bent state based on the included angle information to obtain the actual brightness information of the display screen in the bent state. The technical solution provided by the embodiments of this invention achieves better compensation for the brightness information of the display screen acquired in the bent state, resulting in more accurate acquisition of actual brightness information, which is beneficial to improving the accuracy of data acquisition of the display screen and thus improving the testing accuracy of the display screen.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to an image acquisition method and an image acquisition device. Background Technology

[0002] With the development of display technology, people's requirements for display technology are also increasing. Display screens need to be tested, and image information from the display screen needs to be collected during the testing process. However, the brightness information obtained from images captured using existing methods of image acquisition from the display screen is inconsistent with the actual brightness of the display, affecting the accuracy of display effect testing. Summary of the Invention

[0003] This invention provides an image acquisition method and an image acquisition device to solve the problem that the brightness information of the acquired image is inconsistent with the actual brightness information of the display screen, resulting in low accuracy in testing the display effect of the display screen.

[0004] According to one aspect of the present invention, an image acquisition method is provided, the image acquisition method being applied to an image acquisition device, the image acquisition device being used to acquire brightness data of a display screen; the method includes:

[0005] Acquire first information when the display screen is in a flattened state, the first information including first position information of multiple display points on the display screen when it is in a flattened state;

[0006] Acquire second information about the display screen when it is in a bent state, the second information including second position information of the plurality of display points when the display screen is in a bent state;

[0007] Based on the first position information and the second position information, the included angle information of each of the display points is determined; wherein, the included angle information includes the included angle between the perpendicular line from the display point to the center line in the bent state and the central axis plane where the center line is located; the center line is the center line of a cylinder coplanar with the display screen in the bent state, and the central axis plane is the plane where the axis of symmetry of the display screen in the bent state is located;

[0008] Based on the included angle information, the brightness information of the display point collected in the bending state is compensated to obtain the actual brightness information of the display screen in the bending state.

[0009] Optionally, the first information further includes a first dimension of the display screen in a first direction when it is in the flattened state, and the second information further includes a second dimension of the display screen in a first direction when it is in the bent state;

[0010] Before determining the included angle information of each display point based on the first position information and the second position information, the method further includes:

[0011] The sizes of the first dimension and the second dimension are compared, and the central axis surface is determined based on the comparison result.

[0012] Optionally, determining the central axis surface based on the comparison result includes:

[0013] If the first dimension is the same as the second dimension, then the central axis plane is determined to be a central axis plane parallel to the first direction;

[0014] If the first dimension is different from the second dimension, then the central axis surface is determined to be a central axis surface perpendicular to the first direction.

[0015] Optionally, the first information further includes a third dimension of the display screen in the second direction when it is in the flattened state, and the second information further includes a fourth dimension of the display screen in the second direction when it is in the bent state; wherein the first direction intersects the second direction;

[0016] The central axis surface is determined based on the comparison results, including:

[0017] If the first dimension is the same as the second dimension, and the third dimension is greater than the fourth dimension, then the central axis plane is determined to be a central axis plane parallel to the first direction;

[0018] If the third dimension is the same as the fourth dimension, and the first dimension is larger than the second dimension, then the central axis surface is determined to be a central axis surface parallel to the second direction.

[0019] Optionally, determining the included angle information of each of the display points based on the first position information and the second position information includes:

[0020] Based on the first position information and the second position information of the display point and the position of the central axis surface of the display screen, a first distance from the second position of the display point to the central axis surface and a second distance from the first position of the display point to the central axis surface are determined; wherein, the first position information corresponds to the first position of the display point and the second position information corresponds to the second position of the display point;

[0021] Based on the first distance and the second distance, the included angle information of each display point is determined.

[0022] Optionally, determining the included angle information of each display point based on the first distance and the second distance includes:

[0023] Based on the functional relationship between the first distance, the second distance, and the length of the perpendicular segment from the display point to the center line in the curved state, the angle between the perpendicular line from the display point to the center line in the curved state and the central axis plane where the center line is located is determined.

[0024] Optionally, the angle between the perpendicular line from the display point to the center line in the bent state and the central axis plane where the center line is located is calculated using the following formula:

[0025]

[0026] Where R is the bending radius of the display screen, that is, the length of the perpendicular segment from the display point to the center line in the bent state, and L x L represents the first distance, θ represents the included angle information; t This is the second distance.

[0027] Optionally, the step of compensating for the brightness information of the display point acquired in the bent state based on the included angle information to obtain the actual brightness information of the display screen in the bent state includes:

[0028] Based on the initial brightness information of the display point and the cosine value of the angle corresponding to the initial brightness information, the actual brightness information of each display point in the curved state is determined.

[0029] Optionally, the actual brightness information of the display point in the curved state is calculated using the following formula:

[0030] l E =l e / cos(θ) (2)

[0031] Among them, l E To display the actual brightness information of point e, l e To display the initial brightness information of point e, θ is the angle between the perpendicular line from point e to the center line and the central axis plane where the center line is located in the curved state.

[0032] According to another aspect of the present invention, this embodiment provides an image acquisition device, comprising:

[0033] The first acquisition module is used to acquire first information when the display screen is in a flattened state, the first information including first position information of multiple display points on the display screen when it is in a flattened state;

[0034] The second acquisition module is used to acquire second information when the display screen is in a bent state, the second information including second position information of the plurality of display points in the bent state;

[0035] The calculation module is used to determine the included angle information of each of the display points based on the first position information and the second position information; wherein, the included angle information includes the included angle between the perpendicular line from the display point to the center line in the bent state and the central axis plane where the center line is located; the center line is the center line of a cylinder coplanar with the display screen in the bent state, and the central axis plane is the plane where the axis of symmetry of the display screen in the bent state is located;

[0036] The brightness determination module is used to compensate the brightness information of the display point collected in the bending state according to the included angle information, so as to obtain the actual brightness information of the display screen in the bending state.

[0037] The technical solution of this invention acquires first information about the display screen when it is in a flat state, including first position information of multiple display points on the screen in the flat state. Then, it acquires second information about the display screen when it is in a bent state, including second position information of the multiple display points in the bent state. Based on the first and second position information, it determines the included angle information of each display point. Based on the included angle information, it compensates for the brightness information of the display points acquired in the bent state to obtain the actual brightness information of the display screen in the bent state. This design solves the problem in existing image acquisition methods where the brightness information of the acquired image is inconsistent with the actual brightness of the display screen, affecting the accuracy of display effect testing. The technical solution provided in this embodiment achieves better compensation for the brightness information of the display screen acquired in the bent state, resulting in more accurate actual brightness information, which is beneficial to improving the accuracy of display screen data acquisition and thus improving the testing accuracy of the display screen.

[0038] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a flowchart of an image acquisition method provided in an embodiment of the present invention;

[0041] Figure 2 This is a structural schematic diagram of a display screen in different states provided in an embodiment of the present invention;

[0042] Figure 3 This is a flowchart of another image acquisition method provided in an embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of a display screen in a flattened state according to an embodiment of the present invention;

[0044] Figure 5 This is a schematic diagram of a display screen in a bent state according to an embodiment of the present invention;

[0045] Figure 6 This is a schematic diagram of another display screen in a bent state provided by an embodiment of the present invention;

[0046] Figure 7 This is a flowchart of another image acquisition method provided in an embodiment of the present invention;

[0047] Figure 8 This is a flowchart of another image acquisition method provided in an embodiment of the present invention;

[0048] Figure 9 This is a flowchart of another image acquisition method provided in an embodiment of the present invention;

[0049] Figure 10 This is a flowchart of another image acquisition method provided in an embodiment of the present invention;

[0050] Figure 11 This is a flowchart of another image acquisition method provided in an embodiment of the present invention;

[0051] Figure 12 This is a schematic diagram of an image acquisition device according to an embodiment of the present invention acquiring second information of a display screen when it is in a bent state;

[0052] Figure 13 This is a schematic diagram of the structure of an image acquisition device provided in an embodiment of the present invention. Detailed Implementation

[0053] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0054] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0055] As mentioned in the background section, existing image acquisition methods for displays suffer from inconsistencies between the brightness information of the acquired images and the actual brightness of the display, affecting the accuracy of display effect testing. The inventors discovered that, due to the directionality of light, the light captured by the image acquisition device is perpendicular to the lens of the device. Since the testing of flexible displays requires measuring image data when the display is bent, the actual luminous brightness of the sub-pixels in a bent state differs from the luminous brightness captured by the image acquisition device, impacting the accuracy of display effect testing.

[0056] Figure 1 This is a flowchart of an image acquisition method provided in an embodiment of the present invention. Figure 2 This is a structural schematic diagram of a display screen in different states according to an embodiment of the present invention. (Combined with...) Figure 1 and Figure 2 The image acquisition method provided in this embodiment of the invention is applied to an image acquisition device, which is used to acquire brightness data of a display screen. The image acquisition method provided in this embodiment includes:

[0057] S101. Obtain first information when the display screen is in a flattened state, the first information including first position information of multiple display points on the display screen when in the flattened state.

[0058] Specifically, the display screen provided in this embodiment may include the display screens of terminals such as mobile phones, tablets, and wearable devices. The display screen may be a flexible display screen. The display screen can display images. First information of the display screen in a flattened state can be acquired by an image acquisition device. The image acquisition device may include a camera module or a device with camera functionality. The first information includes first position information of multiple display points on the display screen in the flattened state. The first position information includes the positions of the multiple display points on the display screen in the flattened state.

[0059] S102. Obtain second information when the display screen is in a bent state, the second information including second position information of the plurality of display points in the bent state.

[0060] Specifically, when the display screen is in a bent state, it displays the same image as when it is flat. However, due to the directionality of light, even though the display screen displays the same image as when it is flat, the second information captured by the image acquisition device differs from the first information when it is in a bent state. The second information includes the second position information of multiple display points when the screen is bent. The second position information includes the position of multiple display points on the display screen when it is bent.

[0061] It should be noted that the execution order of S101 and S102 is not limited here. S101 and S102 can be executed simultaneously, or one step can be executed first and the other step can be executed later.

[0062] S103. Determine the included angle information of each of the display points according to the first position information and the second position information; wherein, the included angle information includes the included angle between the perpendicular line from the display point to the center line and the central axis plane in the bent state; the center line is the center line of a cylinder coplanar with the display screen in the bent state, the central axis plane is the plane where the axis of symmetry of the display screen in the bent state is located, and the center line is located on the central axis plane.

[0063] Specifically, Figure 2 The display screen 10 is shown in a flat state and the display screen 20 is shown in a bent state. The position of the display point on the display screen 10 in the flat state is a first position B, and the position of the display point B on the display screen 20 in the bent state is a second position Bt.

[0064] In its flattened state, the display screen 10 extends along a first direction X and a third direction Z. In its bent state, the display screen 20 bends along the first direction X and protrudes along the second direction Y from the plane containing the first direction X and the third direction Z. The centerline is the centerline of a cylinder coplanar with the display screen 20 in its bent state. See also... Figure 2 The centerline is a straight line passing through point O and extending along the third direction Z. The central axis plane P is the axis of symmetry l of the display screen 20 in its curved state. oThe plane in which it is located. Angle information includes the angle θ between the perpendicular line R from the display point to the center line in the bent state and the central axis plane P where the center line is located. The display point can be a pixel on the display screen, without any limitation. Both the first and second information include the position information of the display points on the display screen. Based on the first position information when the display screen is flat and the second position information when the display screen is bent, the angle θ between the perpendicular line from the display point to the center line and the central axis plane P where the center line is located in the bent state can be calculated.

[0065] Since the bending state of each display screen may differ from that of other display screens during the test, the included angle information of each display screen can be determined by collecting secondary information from each display screen.

[0066] S104. Based on the included angle information, the brightness information of the display point collected in the bending state is compensated to obtain the actual brightness information of the display screen in the bending state.

[0067] Specifically, the included angle information can characterize the second position information of each display point in the bent state. This second information includes the initial brightness information of the display screen in the bent state. Based on the included angle information, and using the brightness information of each display point in the second information along with the included angle information, compensation is applied to the brightness information of the display points acquired in the bent state to determine the actual brightness information of each display point in the bent state. This configuration allows the brightness information of the display screen acquired in the bent state to be better compensated, enabling the image acquisition device to acquire more accurate actual brightness information of the display screen in the bent state. This improves the accuracy of data acquisition from the display screen and thus enhances the testing precision of the display screen.

[0068] The technical solution provided in this embodiment acquires first information about the display screen when it is in a flat state, including first position information of multiple display points on the screen. Then, it acquires second information about the display screen when it is in a bent state, including second position information of the multiple display points. Based on the first and second position information, the included angle information of each display point is determined. Based on the included angle information, the brightness information of the display points acquired in the bent state is compensated to obtain the actual brightness information of the display screen in the bent state. This design solves the problem in existing image acquisition methods where the brightness information of the acquired image is inconsistent with the actual brightness of the display screen, affecting the accuracy of display effect testing. The technical solution provided in this embodiment achieves better compensation for the brightness information of the display screen acquired in the bent state, resulting in more accurate actual brightness information, which helps improve the accuracy of display screen data acquisition and thus improves the testing precision of the display screen.

[0069] Optional, Figure 3 This is a flowchart of another image acquisition method provided in an embodiment of the present invention. Figure 4 This is a schematic diagram of a display screen in a flattened state according to an embodiment of the present invention. Figure 5 This is a schematic diagram of a display screen in a bent state provided by an embodiment of the present invention. Figure 6 This is a schematic diagram of another display screen in a bent state provided by an embodiment of the present invention. Based on the above embodiments, combined with... Figures 3 to 6 The first information also includes a first dimension W1 of the display screen in the first direction X when it is in a flattened state, and the second information also includes a second dimension W2 of the display screen in the first direction X when it is in a bent state. The image acquisition method provided in this embodiment includes:

[0070] S101. Obtain first information when the display screen is in a flattened state, the first information including first position information of multiple display points on the display screen when in the flattened state.

[0071] S102. Obtain second information when the display screen is in a bent state, the second information including second position information of the plurality of display points in the bent state.

[0072] S201. Compare the sizes of the first dimension W1 and the second dimension W2, and determine the central axis surface based on the comparison result.

[0073] Specifically, the central axis plane is the plane containing the axis of symmetry of the display screen in its curved state, and the centerline of the cylinder coplanar with the display screen in its curved state lies on the central axis plane. Since the second dimension W2 of the display screen in its curved state can be the same as or different from the first dimension W1 in its flattened state, the bending direction of the display screen can be determined by comparing the sizes of the first dimension W1 and the second dimension W2. For example, the display screen may bend along the first direction X or along a direction intersecting the first direction X, thereby determining the position of the central axis plane.

[0074] S103. Determine the included angle information of each of the display points based on the first position information and the second position information.

[0075] S104. Based on the included angle information, the brightness information of the display point collected in the bending state is compensated to obtain the actual brightness information of the display screen in the bending state.

[0076] Optional, Figure 7 This is a flowchart of another image acquisition method provided in an embodiment of the present invention. Based on the above embodiments, and combined with… Figure 5 , Figure 6 and Figure 7 The image acquisition method provided in this embodiment includes:

[0077] S101. Obtain first information when the display screen is in a flattened state, the first information including first position information of multiple display points on the display screen when in the flattened state.

[0078] S102. Obtain second information when the display screen is in a bent state, the second information including second position information of the plurality of display points in the bent state.

[0079] S301. Compare the sizes of the first size W1 and the second size W2.

[0080] S302. If the first dimension W1 is the same as the second dimension W2, then the central axis plane is determined to be a central axis plane parallel to the first direction X.

[0081] For details, please refer to [link / reference]. Figure 6 If the first dimension W1 is the same as the second dimension W2, and the display screen is bent in a direction intersecting the first direction X, and the display screen is not bent in the first direction X, then the central axis surface is determined to be the central axis surface parallel to the first direction X.

[0082] S303. If the first dimension W1 is different from the second dimension W2, then the central axis plane is determined to be a central axis plane perpendicular to the first direction X.

[0083] For details, please refer to [link / reference]. Figure 5 If the first dimension W1 is different from the second dimension W2, and the display screen does not bend along the direction intersecting the first direction X, but the display screen bends along the first direction X, then the central axis plane is determined to be the central axis plane perpendicular to the first direction X.

[0084] S103. Determine the included angle information of each of the display points based on the first position information and the second position information.

[0085] S104. Based on the included angle information, the brightness information of the display point collected in the bending state is compensated to obtain the actual brightness information of the display screen in the bending state.

[0086] Optional, Figure 8 This is a flowchart of another image acquisition method provided in an embodiment of the present invention. Based on the above embodiments, and combined with… Figure 5 , Figure 6 and Figure 8 The first information also includes a third dimension L1 of the display screen in the second direction Y when it is in a flattened state, and the second information also includes a fourth dimension L2 of the display screen in the second direction Y when it is in a bent state; wherein the first direction X intersects the second direction Y. The image acquisition method provided in this embodiment includes:

[0087] S101. Obtain first information when the display screen is in a flattened state, the first information including first position information of multiple display points on the display screen when in the flattened state.

[0088] S102. Obtain second information when the display screen is in a bent state, the second information including second position information of the plurality of display points in the bent state.

[0089] S301. Compare the sizes of the first size W1 and the second size W2.

[0090] S401. If the first dimension W1 is the same as the second dimension W2, and the third dimension L1 is greater than the fourth dimension L2, then the central axis plane is determined to be a central axis plane parallel to the first direction X.

[0091] For details, please refer to [link / reference]. Figure 6 If the first dimension W1 is the same as the second dimension W2, and the third dimension L1 is greater than the fourth dimension L2, the display screen bends along the second direction Y, but does not bend along the first direction X, then the central axis surface is determined to be the central axis surface parallel to the first direction X.

[0092] S402. If the third dimension L1 is the same as the fourth dimension L2, and the first dimension W1 is greater than the second dimension W2, then the central axis plane is determined to be a central axis plane parallel to the second direction Y.

[0093] For details, please refer to [link / reference]. Figure 5 If the third dimension L1 is the same as the fourth dimension L2, and the first dimension W1 is larger than the second dimension W2, the display screen bends along the first direction X, but does not bend along the second direction Y, then the central axis plane is determined to be the central axis plane parallel to the second direction Y.

[0094] S103. Determine the included angle information of each of the display points based on the first position information and the second position information.

[0095] S104. Based on the included angle information, the brightness information of the display point collected in the bending state is compensated to obtain the actual brightness information of the display screen in the bending state.

[0096] Optional, Figure 9 This is a flowchart of another image acquisition method provided in an embodiment of the present invention. Based on the above embodiments, and combined with… Figure 2 and Figure 9 The image acquisition method provided in this embodiment includes:

[0097] S101. Obtain first information when the display screen is in a flattened state, the first information including first position information of multiple display points on the display screen when in the flattened state.

[0098] S102. Obtain second information when the display screen is in a bent state, the second information including second position information of the plurality of display points in the bent state.

[0099] S501. Based on the first position information and the second position information of the display point and the position of the central axis surface of the display screen, determine the first distance l from the second position of the display point to the central axis surface. x And the second distance l from the first position of the display point to the central axis surface. t Wherein, the first position information corresponds to the first position of the display point, and the second position information corresponds to the second position of the display point.

[0100] Specifically, the first distance l x This can be the distance from the second position of the display point to the central axis plane. The second distance l t This can be the distance from the first position of the display point to the central axis plane.

[0101] Based on the first position information of each display point on the display screen and the position of the central axis of the display screen, determine the first distance l from the first position of the display screen to the central axis of the display screen. x Based on the standard position information of each display point on the screen and the position of the central axis of the screen, determine the second distance l from the second position of the display point to the central axis. t .

[0102] S502, based on the first distance l x and the second distance l t Determine the included angle information of each of the display points.

[0103] Specifically, due to the bending of the display screen, the second distance l t It is equal to the arc length from the second position of the display point to the central axis plane. Based on the first distance l x The second distance and the arc length distance are used to determine the angle between the perpendicular line from the display point to the center line and the central axis plane where the center line is located in the curved state.

[0104] S104. Based on the included angle information, the brightness information of the display point collected in the bending state is compensated to obtain the actual brightness information of the display screen in the bending state.

[0105] Optional, Figure 10 This is a flowchart of another image acquisition method provided in an embodiment of the present invention. Based on the above embodiments, and combined with… Figure 2 and Figure 10 The image acquisition method provided in this embodiment includes:

[0106] S101. Obtain first information when the display screen is in a flattened state, the first information including first position information of multiple display points on the display screen when in the flattened state.

[0107] S102. Obtain second information when the display screen is in a bent state, the second information including second position information of the plurality of display points in the bent state.

[0108] S501. Based on the first position information and the second position information of the display point and the position of the central axis surface of the display screen, determine the first distance l from the second position of the display point to the central axis surface. x And the second distance l from the first position of the display point to the central axis surface. t Wherein, the first position information corresponds to the first position of the display point, and the second position information corresponds to the second position of the display point.

[0109] S601, Based on the first distance l x The second distance l t And the functional relationship between the length of the perpendicular segment from the display point to the center line in the bent state, to determine the angle between the perpendicular line from the display point to the center line in the bent state and the central axis plane where the center line is located.

[0110] For details, please refer to [link / reference]. Figure 2 Because the display screen bent, the second distance l t This is equal to the arc length *l* from the second position of the display point to the central plane. The arc length *l* from the second position of the display point to the central plane = 2 * Π * R * θ / 360 = l t Therefore, the perpendicular line R from the display point to the center line in the curved state can be calculated as 360 l. t / 2*Π*θ.

[0111] First distance l x The first distance l forms a right triangle with the perpendicular line R from the display point to the center line when the display is in a curved state and the central axis plane. x =R*sin(θ), from which we can know that the first distance l x =R*sin(θ)=360l t / 2*Π*θ*sin(θ), due to the first distance l x Second distance l t By acquiring the first and second information, the angle θ between the perpendicular line from the display point to the center line and the central axis plane of the display in the curved state is determined.

[0112] An optional real-time method displays the angle between the perpendicular line from the point to the centerline and the central plane containing the centerline when the object is bent, calculated using the following formula:

[0113]

[0114] Where R is the bending radius of the display screen, that is, the length of the perpendicular segment from the display point to the center line in the bent state, and L x Let the first distance l x θ is the included angle information; L t The second distance l t .

[0115] S104. Based on the included angle information, the brightness information of the display point collected in the bending state is compensated to obtain the actual brightness information of the display screen in the bending state.

[0116] Optional, Figure 11 This is a flowchart of another image acquisition method provided in an embodiment of the present invention. Based on the above embodiments, see [link to related documentation]. Figure 11 The image acquisition method provided in this embodiment includes:

[0117] S101. Obtain first information when the display screen is in a flattened state, the first information including first position information of multiple display points on the display screen when in the flattened state.

[0118] S102. Obtain second information when the display screen is in a bent state, the second information including second position information of the plurality of display points in the bent state.

[0119] S103. Determine the included angle information of each of the display points based on the first position information and the second position information.

[0120] S701. Based on the initial brightness information of the display point and the cosine value of the angle corresponding to the initial brightness information, determine the actual brightness information of each display point in the curved state.

[0121] Specifically, the initial brightness information is the luminous brightness information of each display point when the display screen is in a curved state, directly acquired by the image acquisition device. Based on this second information, the initial brightness information of each display point can be determined. From the angle information of the display screen in a curved state, the angle between the perpendicular line from each display point to the center line and the central axis plane containing the center line can be obtained. The image acquisition device can be configured to acquire light rays parallel to the central axis plane of the display screen. Based on the initial brightness information and the angle information, the actual brightness information of each display point in a curved state is determined.

[0122] In one optional implementation, the actual brightness information of the display point when it is in a curved state is calculated using the following formula:

[0123] l E =l e / cos(θ) (2)

[0124] Among them, l E To display the actual brightness information of point e, l e To display the initial brightness information of point e, θ is the angle between the perpendicular line from point e to the center line and the central axis plane where the center line is located in the curved state.

[0125] Figure 12 This is a schematic diagram illustrating an image acquisition device according to an embodiment of the present invention acquiring second information from a display screen when it is in a bent state. See also... Figure 12 , Figure 12 The example shown illustrates a case where the image acquisition device employs a CCD optical camera. Figure 12 In the diagram, the light emission direction of the first display point A is parallel to the direction D of the CCD optical imaging instrument on the central axis plane of the display screen, which is also the direction in which the CCD optical imaging instrument collects the second information. Direction C is the light emission direction of the second display point B'. The angle θ between direction D and direction C is equal to the angle θ between the perpendicular R from the second display point B' to the center line and the central axis plane P containing the center line. Based on the initial brightness information of the second display point B' and the cosine of the angle θ corresponding to the initial brightness information, the actual brightness information of each second display point B' in the curved state is determined to be equal to the initial brightness information of the second display point B' multiplied by cos(θ).

[0126] Figure 13 This is a schematic diagram of an image acquisition device provided in an embodiment of the present invention. Based on the above embodiment, see... Figure 13 The image acquisition device 100 provided in this embodiment includes:

[0127] The first acquisition module 91 is used to acquire first information when the display screen is in a flattened state, the first information including first position information of multiple display points on the display screen when in the flattened state;

[0128] The second acquisition module 92 is used to acquire second information when the display screen is in a bent state, the second information including second position information of the plurality of display points in the bent state;

[0129] The calculation module 93 is used to determine the included angle information of each of the display points based on the first position information and the second position information; wherein, the included angle information includes the included angle between the perpendicular line from the display point to the center line in the bent state and the central axis plane where the center line is located; the center line is the center line of a cylinder coplanar with the display screen in the bent state, and the central axis plane is the plane where the axis of symmetry of the display screen in the bent state is located;

[0130] The brightness determination module 94 is used to compensate the brightness information of the display point collected in the bending state according to the included angle information, so as to obtain the actual brightness information of the display screen in the bending state.

[0131] The image acquisition device provided in this embodiment acquires first information of the display screen in a flattened state through a first acquisition module 91. This first information includes the first position information of multiple display points on the display screen in the flattened state. A second acquisition module 92 acquires second information of the display screen in a bent state, including the second position information of the multiple display points in the bent state. Then, a calculation module 93 determines the included angle information of each display point based on the first and second position information. A brightness determination module 94 compensates for the brightness information of the display points acquired in the bent state based on the included angle information, obtaining the actual brightness information of the display screen in the bent state. The image acquisition device provided in this embodiment solves the problem in existing image acquisition methods where the brightness information of the acquired image is inconsistent with the actual brightness of the display screen, affecting the accuracy of display effect testing. The technical solution provided in this embodiment achieves better compensation for the brightness information of the display screen acquired in the bent state, resulting in more accurate actual brightness information, which is beneficial to improving the accuracy of display screen data acquisition and thus improving the testing precision of the display screen.

[0132] Furthermore, the technical solution provided in this embodiment can avoid vacuum adsorption for each flexible screen being tested when collecting demura data of the display screen. For each model of display screen, only the first information in the flattened state needs to be collected once. Other displays of the same model will not need to collect the first information in the flattened state, which better avoids damage to the display screen due to testing and further improves the yield rate of the display screen.

[0133] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0134] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. An image acquisition method, characterized in that, The image acquisition method is applied to an image acquisition device for acquiring luminance data of a display screen; the method comprises: acquiring first information of the display screen in a flattened state, the first information comprising first position information of a plurality of display points on the display screen in the flattened state; wherein the first position information comprises positions of the plurality of display points on the display screen in the flattened state; acquiring second information of the display screen in a curved state, the second information comprising second position information of the plurality of display points in the curved state; wherein the second position information comprises positions of the plurality of display points on the display screen in the curved state; determining, according to the first position information and the second position information, angle information of each of the display points; wherein the angle information comprises an angle between a perpendicular line from the display point to a center line of a cylindrical body coplanar with the display screen in the curved state and a median plane of the display screen in the curved state, the center line being located on the median plane; compensating, according to the angle information, luminance information of the display points acquired in the curved state to obtain actual luminance information of the display screen in the curved state; the determining, according to the first position information and the second position information, angle information of each of the display points comprises: determining, according to the first position information and the second position information of the display point and a position of the median plane of the display screen, a first distance from a second position of the display point to the median plane and a second distance from a first position of the display point to the median plane; wherein the first position information corresponds to the first position of the display point, and the second position information corresponds to the second position of the display point; determining, according to the first distance and the second distance, the angle information of each of the display points; the determining, according to the first distance and the second distance, the angle information of each of the display points comprises: determining, according to a functional relationship among the first distance, the second distance and a length of a perpendicular line segment from the display point to the center line in the curved state, the angle between the perpendicular line from the display point to the center line in the curved state and the median plane of the center line; the angle between the perpendicular line from the display point to the center line in the curved state and the median plane of the center line is calculated by using the following formula: (1) wherein is a bending radius of the display screen, i.e. a length of a perpendicular segment from the display point to the center line in the bending state, is the first distance, is the angle information; is the second distance.

2. The method of claim 1, wherein, the first information further comprises a first size of the display screen in a first direction in the flattened state, and the second information further comprises a second size of the display screen in the first direction in the curved state; before the determining, according to the first position information and the second position information, angle information of each of the display points, the method further comprises: comparing the first size and the second size, and determining the median plane according to a comparison result.

3. The method of claim 2, wherein, the determining the median plane according to the comparison result comprises: If the first size is the same as the second size, it is determined that the central axis plane is parallel to the first direction; If the first size is different from the second size, it is determined that the central axis plane is perpendicular to the first direction.

4. The method of claim 2, wherein, The first information further comprises a third size of the display screen in a second direction in the flattened state, and the second information further comprises a fourth size of the display screen in the second direction in the curved state; wherein the first direction intersects the second direction; The central axis plane is determined according to the comparison result, comprising: If the first size is the same as the second size, and the third size is greater than the fourth size, it is determined that the central axis plane is parallel to the first direction; If the third size is the same as the fourth size, and the first size is greater than the second size, it is determined that the central axis plane is parallel to the second direction.

5. The method of claim 1, wherein, The actual brightness information of the display screen in the curved state is obtained by compensating the brightness information of the display point collected in the curved state according to the included angle information, comprising: The actual brightness information of each display point in the curved state is determined according to the initial brightness information of the display point and the cosine value of the included angle corresponding to the initial brightness information; wherein the initial brightness information is the light emitting brightness information of each display point of the display screen in the curved state directly obtained by an image acquisition device.

6. The method of claim 5, wherein, The actual brightness information of the display point in the curved state is calculated by the following formula: (2) wherein is the actual luminance information of the display point e, is the initial luminance information of the display point e, is the angle between the perpendicular from the display point e to the center line and the central axis surface in which the center line lies in the curved state.

7. An image acquisition device, characterized in that Comprising: The first acquisition module is configured to acquire first information of the display screen in a flattened state, wherein the first information comprises first position information of a plurality of display points on the display screen in the flattened state; wherein the first position information comprises positions of the plurality of display points on the display screen in the flattened state. The second acquisition module is configured to acquire second information of the display screen in a curved state, wherein the second information comprises second position information of the plurality of display points in the curved state; wherein the second position information comprises positions of the plurality of display points on the display screen in the curved state. The calculation module is configured to determine included angle information of each display point according to the first position information and the second position information; wherein the included angle information comprises an included angle between a perpendicular line from the display point to a center line and a central axis plane in which the center line is located in the curved state; the center line is a center line of a cylindrical body coplanar with the display screen in the curved state, and the central axis plane is a plane in which a symmetry axis of the display screen in the curved state is located. The brightness determination module is configured to compensate brightness information of the display point collected in the curved state according to the included angle information, to obtain actual brightness information of the display screen in the curved state. The determination of the included angle information of each display point according to the first position information and the second position information comprises: According to the first position information and the second position information of the display point and the position of the central axial plane of the display screen, a first distance from the second position of the display point to the central axial plane and a second distance from the first position of the display point to the central axial plane are determined, wherein the first position information corresponds to the first position of the display point, and the second position information corresponds to the second position of the display point; According to the first distance and the second distance, the angle information of each display point is determined; The determination of the angle information of each display point according to the first distance and the second distance comprises: According to a functional relationship among the first distance, the second distance and the length of the perpendicular line segment from the display point to the center line in the curved state, an angle between the perpendicular line from the display point to the center line in the curved state and the central axial plane where the center line is located is determined; The angle between the perpendicular line from the display point to the center line in the curved state and the central axial plane where the center line is located is calculated by using the following formula: (1) wherein is a bending radius of the display screen, i.e. a length of a perpendicular segment from the display point to a center line in the bending state, is the first distance, is the angle information; is the second distance.

Images