Curvature determination method of curved display panel, curved display panel and display device

Abstract

The present disclosure provides a curvature determination method of a curved display panel, a curved display panel and a display device. The curvature determination method of the curved display panel comprises the following steps: establishing a first correlation between the deflection of the curved display panel along a first direction and the shear stress, wherein the first direction is the bending direction of the curved display panel; determining a constraint condition for the shear stress according to the influence of the shear stress on light leakage of the curved display panel; and generating a curvature variation relationship of the curved display panel along the first direction according to the first correlation under the condition that the constraint condition is met.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and more particularly to a method for determining the curvature of a curved display panel, a curved display panel, and a display device. Background Technology

[0002] Curved display panels refer to display panels with a curved surface. Compared to flat display panels, the distance difference between different areas of a curved display panel and the user's eyes is smaller. Furthermore, their novel appearance makes them increasingly popular with users. However, curved display panels all suffer from light leakage, which negatively impacts user experience. Summary of the Invention

[0003] This disclosure provides a method for determining the curvature of a curved display panel, a curved display panel, and a display device.

[0004] In a first aspect, embodiments of this disclosure provide a method for determining the curvature of a curved display panel, comprising the following steps:

[0005] A first correlation is established between the deflection and shear stress of the curved display panel along a first direction, wherein the first direction is the bending direction of the curved display panel;

[0006] The constraint conditions for shear stress are determined based on the effect of shear stress on light leakage of the curved display panel.

[0007] Under the condition that the constraints are met, the curvature change relationship of the curved display panel along the first direction is generated according to the first association relationship.

[0008] In some embodiments, establishing a first correlation between the deflection and shear stress of the curved display panel along a first direction includes:

[0009] Obtain a second correlation between the shear stress and the cross-sectional shear force of the curved display panel along the first direction;

[0010] Obtain the third correlation between the deflection and bending moment of the curved display panel along the first direction;

[0011] Obtain the fourth correlation between the deflection, cross-sectional shear force, and bending moment of the curved display panel along the first direction;

[0012] The first association relationship is generated based on the second association relationship, the third association relationship, and the fourth association relationship.

[0013] In some embodiments, the constraint condition includes that the shear stress is constant.

[0014] In some embodiments, the curved display panel further includes a second edge extending along a second direction, the second direction intersecting the first direction;

[0015] The method further includes:

[0016] The initial stress distribution state of the second edge is determined based on the curvature variation relationship;

[0017] The fitted shape of the second edge is determined based on the initial stress distribution and support method of the second edge;

[0018] The support parameters of the second edge are determined based on the fitted shape of the second edge.

[0019] In some embodiments, generating the support parameters of the second edge based on the fitted shape of the second edge includes:

[0020] A model of the curved display panel is established based on the determined fitting shape;

[0021] The stress distribution of the second edge under different support conditions was determined through simulation.

[0022] The support parameters of the second edge are determined based on the support state corresponding to the simulation results where the stress distribution state meets the preset stress distribution requirements.

[0023] In some embodiments, the support parameters include the support position and support length for the second edge.

[0024] In some embodiments, the fitted shape includes an arc.

[0025] Secondly, embodiments of this disclosure provide a curved display panel, the curvature of which is determined by the curvature determination method of the curved display panel described in any of the preceding claims.

[0026] Thirdly, embodiments of this disclosure provide a display device including the curved display panel described above.

[0027] Fourthly, embodiments of this disclosure provide a curved display panel, wherein the curvature w of a first edge of the curved display panel along a first direction satisfies:

[0028] w = k1x 3 +k2x, 0≤x≤L / 2;

[0029] w = -k1(xL) 3 -k2(xL), L / 2<x≤L;

[0030] in, L is the dimension of the curved display panel along the first direction, w max The first direction is the bending direction of the curved display panel, where the maximum deflection value is the maximum deflection value of the curved display panel.

[0031] In some embodiments, the curved display panel further includes a second edge extending along a second direction, the second direction intersecting the first direction;

[0032] The curvature w1 of the second edge satisfies:

[0033] in,

[0034] Where R is the radius, and O1 and O2 are the coordinates of the center of the circle.

[0035] In some embodiments, the curved display panel further includes a second edge extending along a second direction, the second direction intersecting the first direction;

[0036] The two ends of the second edge bend away from the light-emitting surface of the curved display panel.

[0037] In some embodiments, the bending amount of the two endpoints of the second edge relative to the center of the second edge is 0.4 to 1.5 mm.

[0038] In some embodiments, the curved display panel further includes a support structure that abuts against a second edge of the curved display panel;

[0039] The contact area between the support structure and the second edge includes the midpoint of the second edge, and the length of the support structure is 20% to 42% of the length of the second edge.

[0040] In some embodiments, the length of the support structure is 30% to 36% of the length of the second edge.

[0041] In some embodiments, the midpoint of the support structure corresponds to the midpoint of the second edge, and the support structure is symmetrically arranged about the central axis of the second edge.

[0042] In some embodiments, the midpoint of the support structure is located between the midpoint of the second edge and the top endpoint of the second edge.

[0043] In some embodiments, in the region abutting the support structure, the second edge extends in a straight line; and / or

[0044] Between the two ends of the support structure and the two endpoints of the second edge, the bending amount of the second edge gradually increases toward the side away from the light-emitting surface of the curved display panel.

[0045] In some embodiments, along the direction from the midpoint of the second edge to the two endpoints, the bending amount of the second edge gradually increases toward the side away from the light-emitting surface of the curved display panel, and the shape of the support structure matches the shape of the second edge. Attached Figure Description

[0046] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a flowchart illustrating the method for determining the curvature of a curved display panel provided in an embodiment of this disclosure;

[0048] Figure 2 This is a schematic diagram of phase delay provided in an embodiment of this disclosure;

[0049] Figure 3A This is a schematic diagram of the structure of the display device provided in the embodiments of this disclosure;

[0050] Figure 3B This is a schematic diagram of stress distribution of a curved display panel provided in an embodiment of this disclosure;

[0051] Figure 4A This is a force diagram of the curved display panel provided in an embodiment of this disclosure;

[0052] Figure 4B yes Figure 4A The shear force diagram of the curved display panel is shown.

[0053] Figure 5A This is a stress simulation diagram of a curved display panel in related technologies;

[0054] Figure 5B This is a diagram illustrating the working state of curved display panels in related technologies;

[0055] Figure 6 This is a schematic diagram illustrating the setting of constraints in an embodiment of this disclosure;

[0056] Figure 7 This is a schematic diagram of the shape of the first edge of the curved display panel in an embodiment of this disclosure;

[0057] Figure 8 This is a schematic diagram of the support state of the second edge of the curved display panel in an embodiment of this disclosure;

[0058] Figure 9AThis is a schematic diagram of the support force distribution at the second edge of a curved display panel in related technologies;

[0059] Figure 9B This is a schematic diagram of the support force distribution at the second edge of the curved display panel in an embodiment of this disclosure;

[0060] Figure 9C This is a schematic diagram of the support force distribution at the second edge of a curved display panel in related technologies;

[0061] Figure 10 This is a schematic diagram of the deflection of the second edge of the curved display panel in an embodiment of this disclosure;

[0062] Figure 11A This is the simulation result of the support of the second edge of the curved display panel in the embodiments of this disclosure;

[0063] Figure 11B This is a partial schematic diagram of the simulation results of the support of the second edge of the curved display panel in an embodiment of this disclosure;

[0064] Figure 12 This is a schematic diagram showing the relationship between the shear stress of the curved display panel and the support length of the second edge in an embodiment of this disclosure;

[0065] Figure 13A This is a stress simulation diagram of the curved display panel provided in the embodiments of this disclosure;

[0066] Figure 13B This is a diagram showing the working state of the curved display panel provided in the embodiments of this disclosure. Detailed Implementation

[0067] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0068] The terms "first," "second," etc., used in the embodiments of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes 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 these processes, methods, products, or devices. Additionally, the use of "and / or" in this application indicates at least one of the connected objects, such as A and / or B and / or C, representing seven possibilities: including A alone, B alone, C alone, both A and B present, both B and C present, both A and C present, and A, B, and C present.

[0069] This disclosure provides a method for determining the curvature of a curved display panel.

[0070] like Figure 1 As shown, in one embodiment, the method includes the following steps:

[0071] Step 101: Establish a first correlation between the deflection and shear stress of the curved display panel along a first direction, wherein the first direction is the bending direction of the curved display panel.

[0072] Neumann and Maxwell studied the theory of birefringence in transparent media under arbitrary force systems, establishing the stress-optical law: The directions of the three principal stresses or principal strains at any point in an elastic body exhibiting birefringence coincide with the directions of the three principal refractive indices at that point; the principal strain at any point in the elastic body is proportional to the change in principal refractive index caused by deformation at that point. This law can be expressed as:

[0073] n1-n2=A(σ1-σ2),

[0074] n2-n3=A(σ2-σ3),

[0075] n3-n1=A(σ3-σ1)……(1);

[0076] In the above formula (1), n1, n2, and n3 are the principal refractive indices of the material after deformation, which are aligned with the directions σ1, σ2, and σ3, respectively. For example, n1, n2, and n3 can be the principal refractive indices in the x, y, and z directions of a three-dimensional rectangular coordinate system, respectively, while σ1, σ2, and σ3 are the normal stresses in the x, y, and z directions, respectively. A can be understood as the stress optical constant of the material, which is specifically the difference between the longitudinal stress optical constant and the transverse stress optical constant of the material, and is a constant determined according to the material properties.

[0077] like Figure 2 As shown, from the above formula (1), it can be concluded that the stress on the medium will cause a change in the refractive index on each principal axis. Since the propagation speed of light is different in media with different refractive indices, birefringence will occur, resulting in a phase delay. The corresponding phase delay can be expressed as:

[0078] R etar =σ*h*C……(2);

[0079] In the above formula (2), R etar Let σ be the phase delay caused by stress, C be a preset constant, h be the thickness of the medium, and σ be the normal stress.

[0080] like Figure 3A As shown, in Figure 3A In the illustrated embodiment, the display device includes a back panel module 301 and a curved display panel 302. Specifically, the back panel module 301 may include a housing 3011, a backlight module 3012, and a support member 1013, etc. During implementation, the structure of the back panel module 301 can be configured as needed. Further, as... Figure 3B As shown, in some embodiments, the curved display panel 302 includes an array substrate 3021 and a color filter substrate 3022 opposite to the cell.

[0081] Please continue reading. Figure 3B When a curved display panel is bent, it experiences three types of stress: normal stress δz, bending stress δM, and shear stress τ.

[0082] The direction of the normal stress is perpendicular to the polarization axis of the polarizer; therefore, polarized light cannot pass through the polarizer. The sum of the bending stresses on the cross-section is zero, so they cancel each other out. The direction of the shear stress is parallel to the polarization axis of the polarizer, allowing it to pass through. Therefore, light leakage is mainly caused by shear stress.

[0083] In this embodiment, a first correlation is first established between the deflection and shear stress of the curved display panel along the first direction.

[0084] In this embodiment, the first direction is the bending direction of the curved display panel. Taking a rectangular display panel as an example, the display panel has a first edge L1 and a second edge L2. Here, the first edge L1 refers to the relatively longer edge of the display panel along the first direction, also known as the length direction of the display panel, and the second edge L2 refers to the relatively shorter edge of the display panel along the second direction, usually referred to as the height or width direction of the display panel. Generally, the display panel is bent along its length direction, that is, the first edge L1 is bent, making the surface of the display panel curved.

[0085] It should be noted that in the coordinate system established by the technical solution of this embodiment, the length direction of the long side of the curved display panel is the x-direction, the length direction of the short side of the curved display panel is the y-direction, and the thickness direction of the curved display panel is the z-direction.

[0086] As can be seen from the above analysis, light leakage is mainly caused by shear stress. Therefore, in this embodiment, the relationship between shear stress and the deflection of the display panel along the first direction is established to optimize the curvature of the display panel.

[0087] In one embodiment, step 101 specifically includes:

[0088] Obtain a second correlation between the shear stress and the cross-sectional shear force of the curved display panel along the first direction;

[0089] Obtain the third correlation between the deflection and bending moment of the curved display panel along the first direction;

[0090] Obtain the fourth correlation between the deflection, cross-sectional shear force, and bending moment of the curved display panel along the first direction;

[0091] The first association relationship is generated based on the second association relationship, the third association relationship, and the fourth association relationship.

[0092] In the technical solution of this embodiment, the curved display panel is a typical plate structure. In this embodiment, it is assumed that the bends at the same position along the second direction of the display panel are consistent. Thus, the curved display panel is analyzed as a beam structure to simplify the calculation process.

[0093] Taking the second direction as the x-direction and the thickness direction of the curved display panel as the z-direction, the second correlation between the shear stress and the interface shear force of the curved display panel can be obtained as follows:

[0094]

[0095] In the above formula, τ is the shear stress, V is the cross-sectional shear force, I is the moment of inertia of the cross-section of the curved display panel perpendicular to the first direction, h is the thickness of the curved display panel, and z is the coordinate in the thickness direction of the curved display panel, wherein the origin of the coordinate in the thickness direction is the midpoint in the thickness direction of the curved display panel.

[0096] like Figure 4A As shown, in one embodiment, the fixed structure applies a force F perpendicular to the surface of the curved display panel, such that the shear force distribution is as follows: Figure 4B As shown.

[0097] It is important to understand that when a curved display panel bends, it is constrained by multiple fixed structures, and these fixed structures are generally symmetrically distributed. Therefore, in this embodiment, the curved display panel is further equivalent to a simply supported beam structure model for calculation to simplify the calculation process.

[0098] In one embodiment, the third correlation between the deflection and bending moment of the curved display panel can be expressed as:

[0099]

[0100] In the above formula, w is the deflection, M(x) is the bending moment at coordinate x, where the origin of the coordinate system is one end along the first direction, and E is the elastic modulus of the curved display panel along the x direction.

[0101] Next, we determine the fourth relationship between the deflection, section shear force, and bending moment of the curved display panel:

[0102]

[0103] Substituting formulas (3) and (4) into formula (5) yields:

[0104]

[0105] Since the thickness of the curved display panel is relatively small compared to its dimension in the first direction, the shear stress variation within its thickness range can be ignored. Therefore, in this embodiment, z is set to 0 to simplify the calculation. Thus, the above formula (6) can be simplified to:

[0106]

[0107] This establishes the first correlation between deflection and shear stress along the first direction.

[0108] Step 102: Determine the constraint conditions for shear stress based on the influence of shear stress on light leakage of the curved display panel.

[0109] As can be seen from the above analysis, light leakage is caused by stress concentration of shear stress. Therefore, in order to avoid light leakage, it is necessary to reduce or avoid the occurrence of stress concentration.

[0110] like Figure 5A As shown, simulations of curved display panels in related technologies reveal that stress concentration primarily occurs at the four vertices, with lighter-colored areas indicating greater shear stress. Furthermore, combined with... Figure 5B As shown, light leakage in curved display panels in related technologies is indeed more noticeable at the four vertices.

[0111] In some embodiments, the constraint can be set such that the maximum value of the shear stress is less than a certain preset shear stress threshold.

[0112] like Figure 6 As shown, in another embodiment, the constraint condition is defined as the shear stress τ being a constant. This avoids stress concentration and further simplifies the calculation process.

[0113] Step 103: Under the condition that the constraint is met, generate the curvature change relationship of the curved display panel along the first direction according to the first association relationship.

[0114] When the shear stress τ is constant, integrating the above formula (7) yields:

[0115]

[0116]

[0117]

[0118] In the above formula, a, b, and c are all integral coefficients, which are constants.

[0119] Combining the above formula (4), the boundary conditions are determined as M(x) = 0 when x = 0, and w = 0 when x = 0.

[0120] Substituting the determined boundary conditions into formulas (8) to (10) above, we can obtain:

[0121]

[0122] make k2–b, then we can obtain:

[0123] w = k1x 3 +k2x……(12);

[0124] In the above formula (12), k1 and k2 can both be understood as constant coefficients. That is to say, in this embodiment, a cubic function including a first-order term and a cubic term is finally determined as the curvature optimization result for the first edge L1.

[0125] In this embodiment, the coefficient constants k1 and k2 in the curvature formula of the display panel are further determined according to the design requirements.

[0126] Differentiating from the above formula (13) yields:

[0127] w'=3k1x 2 +k2……(13);

[0128] like Figure 7 As shown, for curved display panels, the deflection reaches its maximum value w at the central position. max Furthermore, the curvature of the display panel is continuously changing. Mathematically, this can be understood as the deflection equation of the display panel being continuous and differentiable at the center of the display panel.

[0129] Thus, when the boundary condition x = L / 2, w = w max When x = L / 2, w' = 0.

[0130] Please refer to Figure 7 Here, L is the length of the display panel in the first direction, and w max These are the maximum deflection values ​​of the display panel. Both values ​​are design values ​​for the display panel and are known constants.

[0131] Substituting the boundary conditions into the above formulas (12) and (13) yields the following results.

[0132] Based on the design parameters of the curved display panel, L and w max Since all quantities are known, the display panel can be obtained. Figure 7 The curvature equation for the left half of the coordinate system shown.

[0133] Furthermore, the right half of the display panel is symmetrical to the left half; therefore, the curvature equation of the display panel can be determined by coordinate translation as follows:

[0134] w = k1x 3 +k2x, 0≤x≤L / 2,

[0135] w = -k1(xL) 3 -k2(xL), L / 2<x≤L;…(14);

[0136] Table 1: Coefficients and Constants for Curved Display Panels

[0137]

[0138] As shown in Table 1, for curved display panels with different design requirements, the corresponding coefficient constants k1 and k2 can be obtained to determine the curvature of the curved display panel.

[0139] In some embodiments, considering the errors that may occur due to factors such as actual manufacturing and assembly, a certain margin is also reserved. For example, a redundancy coefficient k can be set, with the value of k being approximately equal to 1. Specifically, if the margin is set to 3%, then k = ±3%. In implementation, the redundancy is k*w = 3%w, which means that a 3% deviation is allowed between the actual curvature and the curvature w calculated according to the above formula (14). In implementation, the value of the redundancy coefficient k can be set as needed to accommodate various possible errors.

[0140] In some embodiments, the curved display panel further includes a second edge L2 extending along a second direction. The method further includes:

[0141] The initial stress distribution state of the second edge L2 is determined based on the curvature variation relationship;

[0142] The fitted shape of the second edge L2 is determined based on the initial stress distribution state and support method of the second edge L2;

[0143] The support parameters of the second edge L2 are determined based on the fitted shape of the second edge L2.

[0144] Further research on the curved display panel revealed that after the display panel is bent, there is no light leakage at the middle position of the second edge L2 of the curved display panel. Combined with the simulation results of the curved display panel, it can be found that the initial stress distribution of the second edge L2 of the curved display panel is that the shear stress in the middle part is relatively small, while the shear stress on both sides is relatively large, and stress concentration is easy to occur.

[0145] like Figure 8 As shown, analysis suggests that the cause of this phenomenon is that tensile stress is generated at both ends of the second edge L2 at the two first edges L1 of the curved display panel, while the tensile stress in the middle area of ​​the curved display panel is smaller.

[0146] like Figure 9A As shown, in the related technology, the supporting force F1 of the second edge L2 is smaller in the middle and relatively larger on both sides, which makes the stress concentration phenomenon more obvious at both ends of the second edge L2.

[0147] In this embodiment, the optimization scheme for the second edge L2 is to increase the support force F1 in the middle region of the second edge L2, while reducing the support force F1 in the two side regions of the second edge L2.

[0148] like Figure 9B As shown, in some embodiments, the support force gradually decreases from the center of the second edge L2 to both sides.

[0149] like Figure 9CAs shown, further, in some embodiments, no support force is applied to the portions at both ends of the second edge L2.

[0150] In some embodiments, the second edge L2 is supported along the second edge L2, and the distribution of the supporting force is symmetrical about the midpoint of the second edge L2. Obviously, with increased supporting force at the midpoint, the curved display panel may experience slight deformation.

[0151] like Figure 10 As shown, in the technical solution of this embodiment, the two ends of the second edge L2 are bent away from the light-emitting surface of the curved display panel relative to the central position. It can be understood that the second edge L2 will become a curved shape with the middle protruding forward and the two sides concave. Here, protruding forward means protruding towards the front of the curved display panel, or it can be understood as protruding towards the observer in the normal use state.

[0152] By controlling the two ends of the second edge L2 to bend backward, the pressure at the two endpoints of the second edge L2, that is, the four vertices of the curved display panel, can be relieved to some extent.

[0153] In some embodiments, the two endpoints of the second edge L2 are bent by 0.4 to 1.5 mm relative to the center of the second edge L2.

[0154] Please see Figure 10 , Figure 10 The dashed section can be understood as the second edge L2 after the curve. Figure 10 The direction above (the negative direction of the w-axis) can be understood as the direction of the light-emitting side of the display panel. Since the w-coordinate of the center position of the second edge L2 is 0, the w-coordinates of the two endpoints of the second edge L2 are the bending amounts of the endpoints of the second edge L2. In this embodiment, the bending amount of the two endpoints of the second edge L2 is controlled to be 0.4 to 1.5 mm, which can alleviate stress concentration at the endpoints and avoid excessive bending that would generate additional tensile stress.

[0155] In some embodiments, the bending amount can be further controlled to be 0.4 to 0.6 mm, for example, 0.5 mm, which helps to control the reasonable distribution of stress and reduce light leakage caused by stress concentration.

[0156] Please see Figure 11A and Figure 11B , Figure 11A This is a schematic diagram simulating a curved display panel. Figure 11B for Figure 11A A magnified view of the lower left corner of the curved surface display panel. Figure 11A and Figure 11B As can be seen, the top of the display panel dips backward.

[0157] In practice, symmetrical curves such as parabolas and circles can be used as the fitting shape for the second edge L2.

[0158] In one exemplary embodiment, the fitted shape includes an arc, meaning that the shape of the second edge L2 is considered to be part of a circle.

[0159] For example, let the equation of the circle containing the second edge L2 be:

[0160] (w1+O2) 2 +(y-O1) 2 =R 2 ……(15);

[0161] Based on formula (15), we can obtain:

[0162]

[0163] In formulas (15) and (16) above, w1 is the curvature of the second edge L2, R is the radius of the circle, and O1 and O2 are the coordinates of the center of the circle, respectively. In practice, formulas (15) or (16) can be limited to the part corresponding to the second edge L2 by adding a domain.

[0164] In the above formulas (15) and (16), R and the center of the circle must satisfy the following conditions:

[0165]

[0166] In the above formula (17), Δ is the amount of sinking at the top of the display panel, which is the maximum deflection of the second edge L2, and k3 is a preset coefficient, with the value of k3 ranging from 20% to 45%.

[0167] After determining the fitted shape, the support method for the second edge L2 is determined based on the fitted shape used.

[0168] In one exemplary embodiment, the support parameters of the second edge L2 are determined by simulation.

[0169] In some embodiments, generating the support parameters of the second edge L2 based on the fitted shape of the second edge L2 includes:

[0170] A model of the curved display panel is established based on the determined fitting shape;

[0171] The stress distribution of the second edge L2 under different support conditions was determined by simulation.

[0172] The support parameters of the second edge L2 are determined based on the support state corresponding to the simulation results where the stress distribution state meets the preset stress distribution requirements.

[0173] In one embodiment, a model of the curved display panel can be created using modeling and simulation software, and then different constraints can be applied through simulation testing to determine the simulation results for the curved display panel.

[0174] In an exemplary embodiment, finite element analysis can be selected to simulate the curved display panel. In practice, a model of the curved display panel is first established based on the fitted shape used, and then a mesh is generated for finite element analysis to obtain the inverse analysis results for the curved display panel.

[0175] The obtained simulation analysis results include the stress distribution state of the second edge L2. Based on the obtained simulation results, the support state can be continuously adjusted, and then the simulation can be repeated. Figure 10 As shown, this process is iterated and adjusted continuously until the stress distribution obtained from the simulation meets the preset stress distribution requirements.

[0176] In some embodiments, the support parameters adjusted during simulation include the support position and support length for the second edge L2.

[0177] In an exemplary embodiment, as can be seen from the above analysis, it is necessary to increase the support force at the central position of the second edge L2. Therefore, the support position is set at the center of the second edge L2, and the support length refers to the range to which the support force is applied to the second edge L2.

[0178] like Figures 10 to 12 As shown, in some embodiments, after simulation and testing, the support structure abuts against the curved display panel at the second edge L2. The support structure extends from the center of the second edge L2 along the second edge L2 to both sides of the second edge L2, and the maximum distance between the support structure and the center of the second edge L2 is 10% to 21% of the length of the second edge L2.

[0179] In one embodiment, the abutment area between the support structure and the second edge L2 includes the midpoint of the second edge L2, that is, the support structure is located approximately in the middle of the second edge L2, rather than aligned with the endpoint of the second edge L2.

[0180] In some embodiments, the midpoint of the support structure corresponds to the midpoint of the second edge L2. This can be understood as the position of the midpoint of the support structure corresponding to the position of the midpoint of the second edge L2. Thus, the support structure is symmetrically distributed on both sides of the central axis of the second edge L2. The total length of the support structure is 20% to 42% of the total length of the second edge L2. Thus, the length of the portion of the support structure located on each side of the central axis of the second edge L2 is 10% to 21% of the total length of the second edge L2.

[0181] like Figure 10 As shown, the dimension of the second edge L2 is H, and the support length is H1. Thus, the support length H1 is 20% to 42% of the length H of the second edge L2.

[0182] In some embodiments, the support length H1 is 30% to 36% of the length H of the second edge L2. That is, the support force for the second edge L2 is distributed within a range of 15% to 18% of the total length of the second edge L2 extending from the center to both sides. This makes the shear stress distribution of the second edge L2 relatively uniform, reducing the possibility of stress concentration on the second edge L2, especially reducing the possibility of stress concentration at the four vertices of the curved display panel, thereby helping to reduce the possibility of light leakage of the curved display panel and improving the display effect.

[0183] In another embodiment, the midpoint of the support structure is located between the midpoint of the second edge L2 and the top endpoint of the second edge L2. This can be understood as the support structure being located at the center of the second edge L2, closer to the upper side. Generally, the display device is used at a slight forward tilt; adjusting the position of the support structure helps reduce the possibility of stress concentration.

[0184] In some embodiments, the support structure can be arranged in a straight line, so that the middle portion of the second edge L2, which is the portion in contact with the support structure, is also distributed in a straight line under the support of the support structure. Between the two ends of the support structure and the two endpoints of the second edge L2, the bending amount of the second edge L2 gradually increases towards the side away from the light-emitting surface of the curved display panel, that is, the sinking amount of the second edge L2 gradually increases.

[0185] In other embodiments, the shape of the support structure can be adjusted, for example, by adding some undulations and bends. For example, in one embodiment, along the direction from the midpoint of the second edge L2 to its two endpoints, the bending amount of the second edge L2 gradually increases towards the side away from the light-emitting surface of the curved display panel. The shape of the support structure matches the shape of the second edge L2; that is, the support structure can be approximately a slightly curved arc, thereby better adapting to the shape of the second edge L2, which has a certain amount of downward slope at its apex. This helps to further reduce stress concentration and improve the support effect on the second edge L2.

[0186] like Figure 13A As shown, simulations of the optimized curved display panel reveal a reduction in stress concentration. Figure 13B As shown, the light leakage phenomenon of the display panel has been significantly improved.

[0187] This disclosure provides a curved display panel, the curved display panel including a curved display panel, the curvature of the curved display panel being determined by any of the above-mentioned methods for determining the curvature of a curved display panel.

[0188] This disclosure also provides a curved display panel, which includes a curved display panel, wherein the curvature W of the first edge L1 of the curved display panel along the first direction satisfies the above formula (14).

[0189] In some embodiments, the second edge L2 of the curved display panel is supported by a support structure that abuts against the curved display panel. The support structure extends from the center of the second edge L2 along both sides of the second edge L2, and the maximum distance between the support structure and the center of the second edge L2 is 10% to 21% of the length of the second edge L2. The total length of the support structure is 20% to 42% of the total length of the second edge L2.

[0190] Furthermore, in some embodiments, the maximum distance between the support structure and the center of the second edge L2 is 15% to 18% of the length of the second edge L2.

[0191] In an exemplary embodiment, the size of the support structure supporting the second edge L2 can be controlled to be one-third of the length of the second edge L2. For example, if the length of the second edge L2 is 360 mm, the support structure can be set at the 120 mm position of the middle third of the second edge L2.

[0192] This disclosure provides a display device including the curved display panel described above.

[0193] Since the technical solution of this embodiment includes all the technical solutions of the above-mentioned curved display panel curvature determination method embodiment, it can at least achieve all the above-mentioned technical effects, and will not be repeated here.

[0194] The above description represents the preferred embodiments of this disclosure. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles described herein, and these improvements and modifications should also be considered within the scope of protection of this disclosure.

Claims

1. A method for determining the curvature of a curved display panel, comprising the following steps: A first correlation is established between the deflection and shear stress of the curved display panel along a first direction, wherein the first direction is the bending direction of the curved display panel; The constraint conditions for shear stress are determined based on the effect of shear stress on light leakage of the curved display panel. Under the condition that the constraints are met, the curvature change relationship of the curved display panel along the first direction is generated according to the first association relationship; The curved display panel further includes a second edge extending along a second direction, which intersects the first direction; The method further includes: The initial stress distribution state of the second edge is determined based on the curvature variation relationship; The fitted shape of the second edge is determined based on the initial stress distribution and support method of the second edge; The support parameters of the second edge are determined based on the fitted shape of the second edge; The bending amount of the two endpoints of the second edge relative to the center of the second edge is 0.4-1.5mm.

2. The method according to claim 1, wherein, Establishing a first correlation between the deflection and shear stress of the curved display panel along a first direction includes: Obtain a second correlation between the shear stress and the cross-sectional shear force of the curved display panel along the first direction; Obtain the third correlation between the deflection and bending moment of the curved display panel along the first direction; Obtain the fourth correlation between the deflection, cross-sectional shear force, and bending moment of the curved display panel along the first direction; The first association relationship is generated based on the second association relationship, the third association relationship, and the fourth association relationship.

3. The method according to claim 2, wherein, The constraint condition includes that the shear stress is constant.

4. The method according to claim 1, wherein, The step of generating the support parameters of the second edge based on the fitted shape of the second edge includes: A model of the curved display panel is established based on the determined fitting shape; The stress distribution of the second edge under different support conditions was determined through simulation. The support parameters of the second edge are determined based on the support state corresponding to the simulation results where the stress distribution state meets the preset stress distribution requirements.

5. The method according to claim 1 or 4, wherein, The support parameters include the support position and support length for the second edge.

6. The method according to claim 1 or 4, wherein, The fitted shape includes an arc shape.

7. A curved display panel, wherein the curvature of the curved display panel is determined by the curvature determination method of any one of claims 1 to 6.

8. A display device comprising the curved display panel of claim 7.

9. A curved display panel, wherein the curvature of the curved display panel is determined by the curvature determination method of a curved display panel according to any one of claims 1 to 6, and the curvature w of a first edge of the curved display panel along a first direction satisfies: ； ； in, , L is the dimension of the curved display panel along the first direction. The first direction is the bending direction of the curved display panel, where the maximum deflection value is the maximum deflection value of the curved display panel.

10. The curved display panel as claimed in claim 9, wherein, The curved display panel further includes a second edge extending along a second direction, which intersects the first direction; curvature of the second edge satisfy: in, ; Where R is the radius, and These are the coordinates of the center of the circle.

11. The curved display panel as claimed in claim 10, wherein, The curved display panel further includes a second edge extending along a second direction, which intersects the first direction; The two ends of the second edge bend away from the light-emitting surface of the curved display panel.

12. The curved display panel as claimed in claim 11, wherein, The bending amount of the two endpoints of the second edge relative to the center of the second edge is 0.4 to 1.5 mm.

13. The curved display panel as claimed in any one of claims 9 to 12, wherein, The curved display panel also includes a support structure, which abuts against the second edge of the curved display panel. The contact area between the support structure and the second edge includes the midpoint of the second edge, and the length of the support structure is 20% to 42% of the length of the second edge.

14. The curved display panel as claimed in claim 13, wherein, The length of the support structure is 30% to 36% of the length of the second edge.

15. The curved display panel as claimed in claim 13, wherein, The midpoint of the support structure corresponds to the midpoint of the second edge, and the support structure is symmetrical about the central axis of the second edge.

16. The curved display panel as claimed in claim 13, wherein, The midpoint of the support structure is located between the midpoint of the second edge and the top endpoint of the second edge.

17. The curved display panel as claimed in claim 13, wherein, In the region abutting the supporting structure, the second edge extends in a straight line; and / or Between the two ends of the support structure and the two endpoints of the second edge, the bending amount of the second edge gradually increases toward the side away from the light-emitting surface of the curved display panel.

18. The curved display panel as claimed in claim 13, wherein, Along the direction from the midpoint of the second edge to the two endpoints, the bending amount of the second edge gradually increases toward the side away from the light-emitting surface of the curved display panel, and the shape of the support structure matches the shape of the second edge.

Images