Display screen, display device and method of manufacturing a display screen

Abstract

The application discloses a display screen, a display device and a preparation method of the display screen. The display screen has a center area and a plurality of edge areas surrounding the center area. The edge area includes a first sub-area relatively close to the center area and a second sub-area relatively far away from the center area. The display screen includes a display panel, a curved cover plate and an optical adhesive layer. The curved cover plate covers one side of the display panel along the thickness direction of the display panel. The optical adhesive layer is arranged between the display panel and the curved cover plate. The optical adhesive layer includes a first optical adhesive and a second optical adhesive. The first optical adhesive is located in the center area. The second optical adhesive is located in at least one edge area. The rheological property of the second optical adhesive in the first sub-area of the edge area is smaller than that of the first optical adhesive. The display screen in the embodiment of the application can prevent the edge of the optical adhesive layer from being extruded and thinned, ensure a certain safety distance between the display panel and the curved cover plate, and improve the reliability of the display screen.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electronic products, and particularly relates to a display screen, a display device and a preparation method of the display screen. BACKGROUND

[0002] In the information age, the display screen, as one of the most important carriers of information, plays an increasingly important role in people's work and life. In recent years, waterfall screens or full screens have become mainstream design schemes in the display field. In order to improve the screen ratio, the curved bonding technology has emerged as the times require.

[0003] At present, in the manufacturing process of the full screen, the optical adhesive layer is mainly used to realize the bonding and fixing of the display panel and the curved cover plate. However, due to the fluidity of the adhesive, under the condition of curved bonding, the pressure of the bonded curved cover plate will extrude the adhesive in the edge region, so that the adhesive in the edge region flows to other positions, causing the interference between the display panel and the curved cover plate, and resulting in defects.

[0004] Therefore, there is an urgent need for a new display screen, a display device and a preparation method of the display screen. SUMMARY

[0005] The embodiments of the application provide a display screen, a display device and a preparation method of the display screen, which can prevent the edge region of the optical adhesive layer from being extruded and thinned, ensure a certain safety distance between the display panel and the curved cover plate, and improve the reliability of the display screen.

[0006] In a first aspect, the embodiments of the application provide a display screen, which has a center region and a plurality of edge regions surrounding the periphery of the center region, the edge region includes a first sub-region relatively close to the center region and a second sub-region relatively far away from the center region, the display screen includes: a display panel; a curved cover plate covering one side of the display panel in the thickness direction of the display panel, the curved cover plate has a light transmission region and an ink region surrounding the periphery of the light transmission region, the light transmission region corresponds to the first sub-region and the center region, and the ink region corresponds to the second sub-region; an optical adhesive layer arranged between the display panel and the curved cover plate, the optical adhesive layer includes a first optical adhesive and a second optical adhesive, the first optical adhesive is located in the center region, and the second optical adhesive is located in at least one edge region, and the rheological property of the second optical adhesive in the first sub-region of the edge region is smaller than the rheological property of the first optical adhesive.

[0007] In a second aspect, the embodiments of the application provide a display device, which includes the display screen in the above embodiments.

[0008] In a third aspect, the embodiments of the present application further provide a preparation method of a display screen, comprising: preparing an optical adhesive layer on a display panel, the optical adhesive layer comprising a whole layer of adhesive, the optical adhesive layer having a central region and a plurality of edge regions surrounding the central region; providing a mask plate, and irradiating the edge regions of the optical adhesive layer through the mask plate by UV light to solidify the irradiated adhesive to form a patterned pre-solidified adhesive; attaching a curved cover plate to a side of the optical adhesive layer away from the display panel; and solidifying the whole optical adhesive layer, the adhesive in the central region being solidified to form a first optical adhesive, and the adhesive in the edge regions and the pre-solidified adhesive being solidified to form a second optical adhesive.

[0009] Compared with the related art, the display screen in the embodiments of the present application comprises a display panel, a curved cover plate, and an optical adhesive layer for bonding the display panel and the curved cover plate, the optical adhesive layer comprising a first optical adhesive and a second optical adhesive, the first optical adhesive being located in the central region, and the second optical adhesive being located in the edge regions, the second optical adhesive having a smaller rheological property than the first optical adhesive in the first sub-region of the edge regions, i.e., the anti-extrusion performance of the optical adhesive layer in the edge regions is increased, the edge regions of the optical adhesive layer are prevented from being extruded and thinned, and thus a certain safety distance is ensured between the display panel and the curved cover plate, and the reliability of the display screen is improved. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0011] Figure 1 is a top view of a display screen according to an embodiment of the present application;

[0012] Figure 2 is Figure 1 is a sectional view along the C-C direction;

[0013] Figure 3 is a top view of an optical adhesive layer of a display screen according to an embodiment of the present application;

[0014] Figure 4 is a sectional view of a display screen binding in the prior art;

[0015] Figure 5 is Figure 3 is a sectional view along the D-D direction;

[0016] Figure 6 is a top view of an optical adhesive layer according to another embodiment of the present application;

[0017] Figure 7 is a top view of an optical adhesive layer according to yet another embodiment of the present application;

[0018] Figure 8 is a schematic diagram of a pre-cured adhesive under stress according to an embodiment of the present application;

[0019] Figure 9 is a top view of an optical adhesive layer according to yet another embodiment of the present application;

[0020] Figure 10 is a top view of an optical adhesive layer according to yet another embodiment of the present application;

[0021] Figure 11 is Figure 10 is a cross-sectional view along the E-E direction;

[0022] Figure 12 is a flow chart of a method of manufacturing a display screen according to an embodiment of the present application;

[0023] Figure 13 is a schematic diagram of the S10 step in the method of manufacturing according to an embodiment of the present application;

[0024] Figure 14 is a schematic diagram of the S20 step in the method of manufacturing according to an embodiment of the present application;

[0025] Figure 15 is a schematic diagram of the S30 and S40 steps in the method of manufacturing according to an embodiment of the present application;

[0026] Figure 16 is a schematic diagram of the S10 step in the method of manufacturing according to another embodiment of the present application;

[0027] Figure 17 is a flow chart of the S20 step in the method of manufacturing according to another embodiment of the present application;

[0028] Figure 18 is a top view of an optical adhesive layer after a first patterning process according to another embodiment of the present application;

[0029] Figure 19 is a top view of an optical adhesive layer after a second patterning process according to another embodiment of the present application. DETAILED DESCRIPTION

[0030] Features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without some or all of these specific details. The description of the embodiments is merely intended to provide a better understanding of the present application by showing examples of the present application.

[0031] It should be noted that the terms such as first and second, etc., are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Also, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or device. Without more limitations, the elements defined by the statement "include" do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0032] The inventors have found that in the existing display screen, an optical adhesive layer is prepared on the display panel, and then a curved cover plate is covered on one side of the optical adhesive layer. The display panel and the curved cover plate are bonded by curing the optical adhesive layer. However, since the optical adhesive layer has a certain flowability, when the curved cover plate is covered on the optical adhesive layer, the curved cover plate will extrude the edge region of the optical adhesive layer, causing the edge region of the optical adhesive layer to be extruded and thinned. After the optical adhesive layer is cured, the distance between the display panel and the curved cover plate is too close in the edge region, and the display panel and the curved cover plate are prone to interference, resulting in defects.

[0033] To solve the above problems, the present application provides a display screen, a display device and a preparation method of the display screen. Before covering the curved cover plate, the edge region of the optical adhesive layer is pre-cured to increase the anti-extrusion performance of the edge region of the optical adhesive layer, so as to ensure the distance between the display panel and the curved cover plate after the curved cover plate is attached. The present application will be described below in combination with the accompanying drawings. Figures 1 to 19 The display screen, the display device and the preparation method of the display screen in the present application will be described in detail.

[0034] Please refer to Figure 1 and Figure 2The display screen 100 has a center area AA and a plurality of edge areas NA surrounding the center area AA, the edge area NA includes a first sub-area NA1 relatively close to the center area AA and a second sub-area NA2 relatively far away from the center area AA, the display screen 100 includes a display panel 1, a curved cover plate 2 and an optical adhesive layer 3, the curved cover plate 2 covers one side of the display panel 1 along the thickness direction of the display panel 1, the curved cover plate 2 has a light transmission area PA1 and an ink area PA2 surrounding the light transmission area PA1, the light transmission area PA1 corresponds to the first sub-area NA1 and the center area AA, the ink area PA2 corresponds to the second sub-area NA2, the optical adhesive layer 3 is arranged between the display panel 1 and the curved cover plate 2, the optical adhesive layer 3 includes a first optical adhesive 31 and a second optical adhesive 32, the first optical adhesive 31 is located in the center area AA, and the second optical adhesive 32 is located in at least one edge area NA, and the rheological property of the second optical adhesive 32 in the first sub-area NA1 of the edge area NA is less than that of the first optical adhesive 31.

[0035] The display screen 100 in the embodiment of the present application includes a display panel 1, a curved cover plate 2 and an optical adhesive layer 3 for bonding the display panel 1 and the curved cover plate 2, the optical adhesive layer 3 includes a first optical adhesive 31 and a second optical adhesive 32, the first optical adhesive 31 is located in the center area AA, and the second optical adhesive 32 is located in the edge area NA, by making the rheological property of the second optical adhesive 32 in the first sub-area NA1 less than that of the first optical adhesive 31, the anti-extrusion performance of the optical adhesive layer 3 in the edge area NA is increased, the edge area of the optical adhesive layer 3 is prevented from being extruded and thinned, so that a certain safety distance is ensured between the display panel 1 and the curved cover plate 2, and the reliability of the display screen 100 is improved.

[0036] It can be understood that the optical adhesive layer 3 includes two forms, before being attached to the curved cover plate 2, the optical adhesive layer 3 is in a flowing state and is laid on the display panel 1, and after being attached to the curved cover plate 2, the optical adhesive layer 3 needs to be solidified as a solid as a whole to utilize the bonding force generated by the solidification of the optical adhesive layer 3 to realize the bonding between the curved cover plate 2 and the display panel 1, therefore, in order to ensure a certain safety distance between the display panel 1 and the curved cover plate 2, the rheological property of the optical adhesive layer 3 in the edge area NA should be reduced before being attached to the curved cover plate 2, that is, when the optical adhesive layer 3 is in a flowing state and is laid on the display panel 1.

[0037] Specifically, the rheological property of the colloid refers to the deformation and flow property of the colloid under external force, and the deformation or flow is related to the property and internal structure of the colloid, and also related to the relative motion state between the particles in the colloid. According to the data, the smaller the rheological property, the higher the hardness of the colloid, and the smaller the contact deformation, which can be characterized by the loss modulus of the colloid.

[0038] The rheological property of the gel can be adjusted by UV curing the gel. Specifically, for optical gel, the molecular chains in the gel grow during the curing process, and the flowability of the molecules gradually decreases. The polymer chains are connected together and crosslinked with each other, thereby connecting into a huge molecule to play a curing role. Therefore, the higher the curing degree is, the lower the rheological property is.

[0039] For example, when the gel is DESSA JR21.55 optical gel, the storage modulus of the gel is about 165 KPa and the loss modulus is about 106 KPa before UV curing, and the storage modulus of the gel is about 905 KPa and the loss modulus is about 940 KPa after UV curing. That is, the modulus difference of the gel before and after UV curing is 8-9 times, which is equivalent to the force required for the UV-cured gel to produce the same deformation, which is about 8-9 times the force required for the gel before UV curing to deform. Therefore, the edge region NA of the optical gel layer 3 can be pre-cured before the curved cover plate 2 is attached, thereby reducing the rheological property of the edge region NA of the optical gel layer 3, and further ensuring that the edge region NA of the optical gel layer 3 will not flow and thin during the process of attaching the curved cover plate 2, so as to ensure the safety distance between the display panel 1 and the curved cover plate 2.

[0040] It can be understood that, since the edge region NA of the optical gel layer 3 is pre-cured before the curved cover plate 2 is attached, the curing degree of the edge region NA of the optical gel layer 3 is greater than the curing degree of the center region AA of the optical gel layer 3 after the curved cover plate 2 is attached and the optical gel layer 3 is cured as a whole, thereby reflecting that the rheological property of the second optical gel 32 is less than the rheological property of the first optical gel 31.

[0041] It should be noted that, since the curved cover plate 2 often includes a light transmission region PA1 and an ink region PA2, that is, the outer edge of the curved cover plate 2 is provided with ink 21 to avoid light leakage at the edge of the display panel 1. The edge region NA can include a first sub-region NA1 relatively close to the center region AA and a second sub-region NA2 relatively far from the center region AA. The light transmission region PA1 corresponds to the first sub-region NA1 and the center region AA, and the ink region PA2 corresponds to the second sub-region NA2.

[0042] Therefore, when the curved cover plate 2 is attached and the optical adhesive layer 3 is cured as a whole, the curing degree of the optical adhesive layer 3 in the ink area PA2 may be less than that in the light-transmitting area PA1 due to the shielding of the ink 21. Specifically, since the ink area PA2 corresponds to the second sub-area NA2, the curing degree of the second sub-area NA2 of the second optical adhesive 32 is difficult to determine due to the shielding of the ink 21, but it can be determined that the rheological property of the second optical adhesive 32 in the first sub-area NA1 is less than that of the first optical adhesive 31 in the optical adhesive layer 3 finally formed by curing, since both the first sub-area NA1 of the second optical adhesive 32 and the first optical adhesive 31 are located in the light-transmitting area PA1.

[0043] For ease of description, the initial structure of the optical adhesive layer 3 is defined as a colloid, and the structure of the colloid formed by curing after the colloid is pre-cured in the edge area NA is defined as a pre-cured colloid.

[0044] Please refer to Figure 2 and Figure 3 In some optional embodiments, the first optical adhesive 31 includes a first optical adhesive structure 310, and the second optical adhesive 32 includes the first optical adhesive structure 310 and a second optical adhesive structure 320, and the rheological property of the second optical adhesive structure 320 is less than that of the first optical adhesive structure 310. The first optical adhesive structure 310 is formed by curing the colloid, and the second optical adhesive structure 320 is formed by curing the pre-cured colloid. Since the second optical adhesive structure 320 is subjected to two curing processes, the rheological property of the second optical adhesive structure 320 is less than that of the first optical adhesive structure 310, so that the rheological property of the second optical adhesive 32 is less than that of the first optical adhesive 31.

[0045] The colloid is used to realize the adhesion of the curved cover plate 2 and the display panel 1 by using the adhesion generated by curing the colloid when the colloid is cured as a whole, and the pre-cured colloid is used to support the edge area NA of the optical adhesive layer 3 to avoid being compressed thin when the curved cover plate 2 is attached. Therefore, by including the first optical adhesive structure 310 and the second optical adhesive structure 320 in the second optical adhesive 32, it is indicated that the edge area NA of the optical adhesive layer 3 includes the colloid and the pre-cured colloid before the optical adhesive layer 3 is cured as a whole, so that the adhesion of the optical adhesive layer 3 can be ensured while the anti-compression performance of the edge area NA of the optical adhesive layer 3 is ensured.

[0046] It can be understood that since the first optical adhesive structure 310 is formed by curing the colloid, and the second optical adhesive structure 320 is formed by curing the pre-cured colloid, the colloid and the pre-cured colloid before the optical adhesive layer 3 is cured as a whole can be represented by the first optical adhesive structure 310 and the second optical adhesive structure 320.

[0047] Please refer to Figure 3 and Figure 4In the existing display panel 1, when the binding portion 13 is bound to the display portion 11 away from the light-emitting surface by the bending portion 12, the edge region NA of the optical adhesive layer 3 is pressed. Since the length of the bending portion 12 is fixed, if the edge region NA of the optical adhesive layer 3 is pressed and thinned, the bending radius of the bending portion 12 is reduced, and the display panel 1 is prone to damage, resulting in defects.

[0048] Referring to Figure 5 In some optional embodiments, the display panel 1 includes a display portion 11, a binding portion 13, and a bending portion 12 connected between the display portion 11 and the binding portion 13. The bending portion 12 is arranged in the edge region NA. In the thickness direction, the orthogonal projection of the second optical adhesive structure 320 on the display panel 1 overlaps the bending portion 12. That is, before the curved cover plate 2 is attached, at least the edge region NA corresponding to the bending portion 12 is pre-cured to solidify the adhesive in the edge region NA corresponding to the bending portion 12 into a pre-cured adhesive, thereby improving the anti-pressing performance of the edge region NA where the bending portion 12 is located. Thus, when the binding portion 13 is bound, the edge region NA of the optical adhesive layer 3 will not be thinned due to pressing, so as to ensure the bending radius of the bending portion 12, avoid the display panel 1 from being excessively bent and cracked, and ensure the bending reliability of the display panel 1.

[0049] In addition, when the display screen 100 adopts a flexible display structure with a double-curved surface, for example, the left and right sides of the display screen 100 are curved display, so in addition to arranging the second optical adhesive structure 320 in the edge region NA corresponding to the bending portion 12 of the display panel 1, the second optical adhesive structure 320 can also be arranged in the edge region NA of the left and right sides of the display screen 100.

[0050] Referring to Figure 6 When the display screen 100 adopts a flexible display structure with a four-curved surface, in some optional embodiments, the edge region NA includes a first edge region arranged on both sides of the central region AA along a first direction X and a second edge region arranged on both sides of the central region AA along a second direction Y, and the first direction X intersects the second direction Y. In the optical adhesive layer 3, the first edge region and the second edge region are both provided with the second optical adhesive structure 320.

[0051] By setting the second optical adhesive structure 320 in the optical adhesive layer 3 of the edge area NA of the display screen 100, the optical adhesive layer 3 in the first edge area and the second edge area will not be thinned due to extrusion under the condition of full lamination of the curved surface, further improving the reliability of the four-curved display screen 100. In addition, by setting the second optical adhesive structure 320 in the edge area NA of the display screen 100, the stability of the lamination of the curved cover plate 2 can be ensured to avoid the situation that the optical adhesive layer 3 of a certain edge area is thinned after lamination of the curved cover plate 2, which leads to the inclination of the curved cover plate 2, and improves the reliability of the display panel 1.

[0052] Please refer to Figure 3 and Figure 7 The second optical adhesive structure 320 can cover all areas in a certain or multiple edge areas NA, or can be set in only part of the area in a certain or multiple edge areas NA, for example, the second optical adhesive structure 320 can be set only in the area that is extruded more to improve the adhesion of the optical adhesive layer 3 while ensuring the extrusion resistance of the optical adhesive layer 3.

[0053] It can be understood that when the second optical adhesive structure 320 is set only in the area that is extruded more, the gap range between the second optical adhesive structures 320, i.e., the gap range between the pre-cured adhesives, should also be reasonably adjusted to avoid the adhesives being extruded into the gap when the curved cover plate 2 is laminated, which affects the reliability of the adhesion between the display panel 1 and the curved cover plate 2.

[0054] Please refer to Figure 3 and Figure 7 Since the outer edge of the edge area NA of the optical adhesive layer 3 is extruded more when the curved cover plate 2 is laminated on the display panel 1, in some optional embodiments, the second optical adhesive structure 320 can be extended and set from the side edge of the first edge area away from the center area AA along the first direction X towards the center area AA, and / or the second optical adhesive structure 320 can be extended and set from the side edge of the second edge area away from the center area AA along the second direction Y towards the center area AA. That is, when the optical adhesive layer 3 is pre-cured, the pre-cured adhesive can be extended from the outer edge of the edge area NA inwards to further ensure the extrusion resistance of the optical adhesive layer 3, and at the same time, when the pre-cured adhesive is set at the outer edge, the flow deformation of the adhesive can be blocked by the pre-cured adhesive, thereby better solving the problem of thinning of the edge area NA of the optical adhesive layer 3 due to extrusion.

[0055] Optionally, in the first edge area, the second optical glue structure 320 can be extended by 4mm-6mm from the side edge of the first edge area away from the center area AA in the first direction X towards the center area AA. Similarly, in the second edge area, the second optical glue structure 320 can be extended by 4mm-6mm from the side edge of the second edge area away from the center area AA in the second direction Y towards the center area AA to achieve the setting of the second optical glue structure 320.

[0056] In some optional embodiments, in the edge area NA, the distribution density of the second optical glue structure 320 in the second optical glue 32 gradually increases in the direction away from the center area AA. Wherein, the distribution density of the second optical glue structure 320 refers to the area ratio of the second optical glue structure 320 in the second optical glue 32 per unit area. By gradually increasing the distribution density of the second optical glue structure 320 in the direction away from the center area AA, i.e., before overall curing, the closer to the outer edge of the optical glue layer 3, the higher the proportion of the pre-cured glue in the optical glue layer 3, the smaller the rheological property of the optical glue layer 3, and the better the anti-extrusion performance, thereby better solving the problem of the edge area NA of the optical glue layer 3 being extruded and thinned. And correspondingly, before overall curing, the closer to the center area AA, the higher the proportion of the glue in the optical glue layer 3, i.e., the closer to the center area AA of the optical glue layer 3, the higher the adhesion of the optical glue layer 3, and the better the bonding effect, thereby ensuring the bonding of the display panel 1 and the curved cover plate 2 while the distance between the display panel 1 and the curved cover plate 2, to improve the reliability of the display screen 100.

[0057] Optionally, the increase in the distribution density of the second optical glue structure 320 can be the interval arrangement of multiple second optical glue structures 320, the increase in the area of a single second optical glue structure 320 in the direction away from the center area AA, or the increase in the number of second optical glue structures 320 per unit area in the second optical glue 32, or the increase in both the area and the number of second optical glue structures 320, and the setting form can be adjusted according to the specific structure of the optical glue layer 3, which can meet the increase in the area ratio of the second optical glue structure 320 in the direction away from the center area AA.

[0058] Please refer to Figures 3 to 8In some optional embodiments, the second optical adhesive structure 320 is arranged in a grid structure, and the grid structure has a plurality of hollow holes K, and each hollow hole K is filled with the first optical adhesive structure 310. That is, before the overall curing, the pre-cured adhesive of the edge area NA of the optical adhesive layer 3 is in a grid structure, and the adhesive is filled in the grid structure formed by the pre-cured adhesive. Therefore, when the curved cover plate 2 is attached, the adhesive can be bound in the hollow hole by the pre-cured adhesive, so that when the curved cover plate 2 or the display panel 1 is bent and bound, the flow of the adhesive to other areas can be effectively blocked, the adhesive can be prevented from flowing out and being thinned due to extrusion, and the thickness between the curved cover plate 2 and the display panel 1 can be ensured. Moreover, since the adhesive is arranged in each hollow hole K and can flow in the hollow hole K where the adhesive is arranged, the bubbles can be effectively eliminated, and the bonding effect of the optical adhesive layer 3 can be ensured.

[0059] It can be understood that the grid structure can be divided into a plurality of grid units arranged in connection, and each grid unit is provided with a hollow hole K. For each grid unit, when extrusion is applied, the grid unit formed by the pre-cured adhesive is simultaneously affected by the adhesive in the hollow hole K of the grid unit and the adhesive in the hollow hole K of the grid unit on the side of the grid unit, and the two are balanced, so that the reliable arrangement of the pre-cured adhesive can be ensured. At the same time, for the grid structure subjected to extrusion, since the grid units are connected to each other, even if the forces applied to different grid units are different, the forces can be shared through the connection of the grid units, so that the failure of the pre-cured adhesive due to concentrated force can be avoided.

[0060] Please refer to Figure 3 and Figure 9 In some optional embodiments, the hollow hole K is arranged in at least one of a wave-shaped hole, a circular hole, a circular hole, a polygonal hole, and other irregular shapes. When the hollow hole K is arranged in a polygonal hole, the grid structure can be further arranged in a quadrangular honeycomb structure or a hexagonal honeycomb structure. The structure is the best topological structure covering a two-dimensional plane, has high specific stiffness, high specific strength, high impact resistance, and high energy absorption, and can better realize energy absorption.

[0061] Optionally, the minimum aperture of the hollow hole K is greater than or equal to 0.01 mm, so that the adhesive can be better arranged in the hollow hole K, the proportion of the adhesive can be ensured, the bubbles generated in the bonding process can be eliminated, and the bonding performance of the optical adhesive layer 3 in the edge area NA can be ensured. Moreover, the maximum aperture of the hollow hole K can be less than or equal to 4 mm, so that the grid structure formed by the pre-cured adhesive can effectively constrain the deformation of the adhesive, so that the bonding performance can be ensured, and the optical adhesive layer 3 in the edge area NA can not be thinned due to extrusion, and the reliability of the display screen 100 can be further improved.

[0062] Optionally, when the second optical adhesive structure 320 is configured as a grid structure, the aperture of the perforated holes K in different grid units may differ. For example, the aperture of the perforated holes K in each grid unit may gradually decrease along the direction away from the central region AA to increase the distribution density of the pre-cured adhesive, thereby further ensuring the anti-compression effect of the optical adhesive layer 3 in the edge region NA while ensuring the bonding performance.

[0063] Please see Figure 10 and Figure 11 In some optional embodiments, the second optical adhesive structure 320 is configured as a plurality of spaced-apart support portions, which are dispersed within the first optical adhesive structure 310. By configuring the second optical adhesive structure 320 as a support portion, the structure of the pre-cured adhesive can be simplified, making it easier to mold. When the curved cover plate 2 is bonded, the extrusion pressure is transmitted to the pre-cured adhesive, which then provides support. Since the rheological properties of the pre-cured adhesive are less than those of the colloid, it can reduce the deformation of the optical adhesive layer 3 caused by compression in the edge region NA, effectively preventing the edge region of the optical adhesive layer 3 from thinning due to compression.

[0064] In some optional embodiments, in any edge region NA, the ratio of the sum of the orthographic projection areas of each support portion within the optical adhesive layer 3 to the area of ​​its respective edge region NA is 1 / 4 to 1 / 2. That is, by controlling the area ratio of the support portions to 1 / 4 to 1 / 2, the proportion of adhesive and pre-cured adhesive in the edge region NA of the optical adhesive layer 3 is controlled, thereby ensuring both the compressive strength of the edge region NA of the optical adhesive layer 3 and the bonding strength between the display panel 1 and the curved cover plate 2.

[0065] Optionally, when the second optical adhesive structure 320 is configured as a support portion, the density of the support portions can gradually increase along the direction away from the central region AA. This can include increasing the volume of a single support portion per unit volume, or increasing the number of support portions, thereby further ensuring the anti-compression effect of the optical adhesive layer 3 in the edge region NA while maintaining the adhesive performance.

[0066] As an optional implementation, this application also provides a display device, which includes the display screen 100 provided in the above embodiments. The display device provided in this application has the technical effects of the display screen 100 in any of the above embodiments, and the explanations of the same or corresponding structures and terms as in the above embodiments will not be repeated here. The display device provided in this application can be any product or component with display function, such as a mobile phone, tablet computer, laptop computer, digital photo frame, or navigator, and this application does not impose any special limitations on it.

[0067] Please see Figures 12 to 15The embodiment of the present application also provides a preparation method of the display screen 100, comprising the following steps:

[0068] S10, preparing an optical adhesive layer 3 on the display panel 1, the optical adhesive layer 3 comprising a gel layer arranged integrally, the optical adhesive layer 3 having a central region AA and a plurality of edge regions NA surrounding the central region AA;

[0069] S20, providing a mask plate 4, and irradiating the edge regions NA of the optical adhesive layer 3 through the mask plate 4 by using UV light to solidify the irradiated gel and form a patterned pre-solidified gel;

[0070] S30, adhering the curved cover plate 2 to the side of the optical adhesive layer 3 away from the display panel 1;

[0071] S40, solidifying the whole optical adhesive layer 3, the gel in the central region AA being solidified to form a first optical adhesive 31, and the gel in the edge regions NA and the pre-solidified gel being solidified to form a second optical adhesive 32.

[0072] The preparation method of the display screen 100 in the embodiment of the present application, before adhering the curved cover plate 2, pre-solidifies the edge regions NA of the optical adhesive layer 3 by using UV light to solidify the irradiated gel and form a pre-solidified gel, the molecular chains in the gel grow during the solidification process, and the fluidity of the molecules gradually decreases, the polymer chains are connected together and crosslinked with each other, thereby being connected into a huge molecule to play a solidification role, so that after solidification, the rheological property of the pre-solidified gel is smaller than the rheological property of the gel, thereby the pre-solidified gel is difficult to flow and thin out when adhering the curved cover plate 2, so that after adhering the curved cover plate 2, the display panel 1 and the curved cover plate 2 have a certain safety distance, and the reliability of the display screen 100 is improved.

[0073] Please refer to Figures 13 to 16 In step S10, when preparing the optical adhesive layer 3 on the display panel 1, the thickness of the optical adhesive layer 3 in the edge regions NA and the central region AA can be the same, or the thickness of the optical adhesive layer 3 in any edge region NA can be greater than the thickness of the optical adhesive layer 3 in the central region AA, by increasing the initial thickness of the optical adhesive layer 3 in the edge regions NA, the thickness of the optical adhesive layer 3 in the edge regions NA can be ensured to a certain extent after being extruded, thereby ensuring the distance between the display panel 1 and the curved cover plate 2 in the edge regions NA, and improving the reliability of the display screen 100.

[0074] It should be noted that when the initial thickness of the optical adhesive layer 3 in the edge regions NA is increased, the wrinkle problem of the optical adhesive layer 3 in the edge regions NA after being extruded after the curved cover plate 2 is adhered to the display panel 1 should also be considered, therefore the specific thickness of the edge regions NA and the central region AA of the optical adhesive layer 3 can be adjusted according to the specific structure of the display screen 100, which is not limited in the present application.

[0075] It can be understood that, since the edge region NA of the optical adhesive layer 3 is patterned by the mask 4 in step S20, only part of the glue in the edge region NA of the optical adhesive layer 3 is irradiated and solidified to form the pre-solidified glue, and the other part of the glue is not irradiated, i.e. not solidified, so that the edge region NA of the optical adhesive layer 3 includes both the glue and the pre-solidified glue after the patterning. The glue has a certain rheological property, so that in step S30, when the curved cover plate 2 is attached, the unirradiated part of the glue can flow to fill the edge region NA to eliminate the air bubbles generated during the bonding of the curved cover plate 2 and the display panel 1, ensure the bonding effect between the curved cover plate 2 and the display panel 1, and provide support through the pre-solidified glue to reduce the deformation of the optical adhesive layer 3 during the attachment of the curved cover plate 2, so as to ensure a certain safety distance between the display panel 1 and the curved cover plate 2 and improve the reliability of the display screen 100.

[0076] It can be understood that, after step S20, the optical adhesive layer 3 includes both the glue and the pre-solidified glue, and when the entire optical adhesive layer 3 is solidified in step S40, the glue will undergo a solidification reaction and generate a certain bonding force to achieve the bonding of the curved cover plate 2 and the display panel 1, and the pre-solidified glue will undergo a second solidification, and its strength will be further increased to further ensure the support of the edge region NA of the display screen 100.

[0077] In step S20, the mask 4 can include a light shielding portion and a light leakage pattern portion, and by adjusting the light leakage pattern portion, the glue at the corresponding position in the edge region NA can be solidified to form the pre-solidified glue with a pattern, so as to adjust the proportion of the glue and the pre-solidified glue in the edge region NA and the position of the pre-solidified glue, while ensuring the bonding effect of the display panel 1 and the curved cover plate 2, the edge region NA of the optical adhesive layer 3 is prevented from being squeezed and thinned.

[0078] The pre-solidified glue can be subjected to one patterning process to form the pre-solidified glue with a corresponding structure, or the pre-solidified glue can be subjected to multiple patterning processes, and the multiple patterning processes are superimposed to form the pre-solidified glue with a corresponding structure.

[0079] For example, referring to Figures 17 to 19 In some optional embodiments, in step S20, the mask 4 is provided, and the step of irradiating the edge region NA of the optical adhesive layer 3 with UV light through the mask 4 includes:

[0080] S210, providing a mask 4, the mask 4 is provided with a plurality of parallel strip-shaped holes, and the glue in the edge region NA is subjected to a first patterning process by the mask 4 and UV light.

[0081] S220, rotating the mask 4 by a preset angle, using UV light to perform a second patterning treatment on the glue in the same edge region NA through the mask 4, and the glue solidified by the first and second patterning treatments combines to form a pre-solidified glue with a grid structure.

[0082] Optionally, the area-limiting mask and the strip-shaped hole can be integrated on the same mask 4, and the mask 4 can also include a first sub-mask 41 and a second sub-mask 42, the first sub-mask 41 can be provided with strip-shaped holes arranged in parallel, and the second sub-mask 42 can be provided as an area-limiting mask to limit the UV light to the corresponding edge region NA through the second sub-mask 42 to ensure the incident range of the UV light.

[0083] For ease of description, the following will be described by taking the mask 4 as the first sub-mask 41 and the second sub-mask 42.

[0084] In step S210, the UV light can be made to enter the edge region NA of the optical glue layer 3 through the first sub-mask 41 and the second sub-mask 42, and after irradiating for a certain time, the glue corresponding to the strip-shaped hole corresponding to the first sub-mask 41 is UV-cured, thereby forming a pre-solidified glue with a diagonal pattern in the edge region NA of the optical glue layer 3.

[0085] In step S220, the mask 4 can be rotated, and then the UV light can be made to enter the same edge region NA of the optical glue layer 3 through the first sub-mask 41 and the second sub-mask 42, and after irradiating for a certain time, the glue in the strip-shaped hole corresponding to the first sub-mask 41 is UV-cured, and the diagonal patterns formed by the first and second patterning treatments intersect each other, thereby combining to form a pre-solidified glue with a grid structure, and since the glue in each hollow hole K of the grid structure is not irradiated, the glue can be limited in each hollow hole K of the grid structure, thereby hindering the glue in each hollow hole K from flowing into each other through the pre-solidified glue, to ensure that the edge region NA of the optical glue layer 3 will not be thinned due to being pressed, and improve the reliability of the display screen 100.

[0086] By rotating the same mask 4 by a predetermined angle and then performing a patterning treatment on the optical glue layer 3 again, the cost can also be reduced, and the utilization rate of the mask 4 can be improved.

[0087] The above is merely specific implementation of the present application, and those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described system, module and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be described herein again. It should be understood that the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements shall be encompassed within the protection scope of the present application.

[0088] It should also be noted that the exemplary embodiments mentioned in the present application describe some methods or systems based on a series of steps or devices. However, the present application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiments, or different from the order in the embodiments, or several steps are performed simultaneously.

Claims

1. A display screen, characterized by The display screen includes a central region and multiple edge regions surrounding the central region, the edge regions comprising a first sub-region relatively close to the central region and a second sub-region relatively far from the central region. Display panel; A curved cover plate covers one side of the display panel along the thickness direction of the display panel. The curved cover plate has a light-transmitting area and an ink area surrounding the light-transmitting area. The light-transmitting area corresponds to the first sub-area and the central area, and the ink area corresponds to the second sub-area. An optical adhesive layer is disposed between the display panel and the curved cover plate. The optical adhesive layer includes a first optical adhesive and a second optical adhesive. The first optical adhesive is located in the central region, and the second optical adhesive is located in at least one of the edge regions. The rheological properties of the second optical adhesive in the first sub-region of the edge region are less than those of the first optical adhesive.

2. The display screen of claim 1, wherein, The first optical adhesive includes a first optical adhesive structure, and the second optical adhesive includes a first optical adhesive structure and a second optical adhesive structure. The rheological properties of the second optical adhesive structure are less than those of the first optical adhesive structure.

3. The display screen of claim 2, wherein, The display panel includes a display part, a bonding part, and a bent part connecting the display part and the bonding part. The bent part is disposed in the edge region. In the thickness direction, the orthographic projection of the second optical adhesive structure on the display panel overlaps with the bent part.

4. The display screen of claim 2, wherein, The edge region includes a first edge region disposed on both sides of the central region along a first direction and a second edge region disposed on both sides of the central region along a second direction, wherein the first direction and the second direction intersect. In the optical adhesive layer, the second optical adhesive structure is provided in both the first edge region and the second edge region.

5. The display screen of claim 2, wherein, Within the edge region, the distribution density of the second optical adhesive structure gradually increases in the direction away from the center region.

6. The display screen of claim 2, wherein, The second optical adhesive structure is configured as a mesh structure, the mesh structure having multiple hollow holes, each of which is filled with the first optical adhesive structure.

7. The display screen of claim 6, wherein, The perforated hole is configured as at least one of the following: wavy hole, circular hole, ring-shaped hole, polygonal hole, and other irregular shapes. The minimum diameter of the perforated hole is greater than or equal to 0.01 mm.

8. The display screen of claim 2, wherein, The second optical adhesive structure is configured as a plurality of spaced-apart support portions, which are dispersed within the first optical adhesive structure.

9. The display screen of claim 8, wherein, In the edge region, the ratio of the sum of the orthographic projection areas of each of the supports within the optical adhesive layer to the area of ​​the edge region in which they are located is 1 / 4 to 1 / 2.

10. A display device, characterized by comprising: Includes the display screen as described in any one of claims 1 to 9.

11. A method of manufacturing a display panel, characterized by, include: An optical adhesive layer is prepared on a display panel. The optical adhesive layer comprises an adhesive layer disposed on an entire surface. The optical adhesive layer has a central region and a plurality of edge regions surrounding the central region. The edge regions include a first sub-region relatively close to the central region and a second sub-region relatively far from the central region. A mask is provided, and UV light is irradiated to the edge region of the optical adhesive layer through the mask to solidify the irradiated adhesive to form a patterned pre-solidified adhesive; A curved cover plate is attached to the side of the optical adhesive layer away from the display panel, the curved cover plate having a light transmission region and an ink region around the periphery of the light transmission region, the light transmission region corresponding to the first sub-region and the center region, and the ink region corresponding to the second sub-region; The optical adhesive layer is cured as a whole, and the adhesive in the center region is cured to form a first optical adhesive, and the adhesive in the edge region and the pre-solidified adhesive are cured to form a second optical adhesive.

12. The method of claim 11, wherein, The step of providing a mask and irradiating UV light to the edge region of the optical adhesive layer through the mask includes: A mask is provided, and the mask is provided with a plurality of parallel strip-shaped holes, and the adhesive in the edge region is subjected to first patterned treatment through the mask using UV light; The mask is rotated by a predetermined angle, and the adhesive in the same edge region is subjected to second patterned treatment through the mask using UV light, and the adhesive cured by the first patterned treatment and the second patterned treatment is combined to form the pre-solidified adhesive with a grid structure.

Images