Display panel, preparation method thereof and display device

Abstract

Embodiments of the present application provide a display panel, comprising: a display area, and a frame area surrounding the display area; the display panel comprises: a first substrate and a second substrate opposite the first substrate in the frame area; a first sealant and a second sealant surrounding the first sealant, located between the first substrate and the second substrate, and used for bonding the first substrate and the second substrate. Embodiments of the present application use two parallel sealants to encapsulate the frame area of the display panel, and then obtain the frame structure of the display panel, which can balance the sealing property of the frame structure and the display effect of the display panel.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display devices, in particular to a display panel, a preparation method of the display panel and a display device. BACKGROUND

[0002] At present, display devices need to use sealing glue for cell sealing and frame sealing to ensure the structural strength of the device and avoid the internal components from being corroded by external moisture. The sealing glue often exerts extrusion stress on the frame structure, affecting the performance of the display device, and thus affecting the display effect of the display panel. The current technical difficulty lies in how to balance the sealing property of the frame structure and the display effect of the display panel. SUMMARY

[0003] In order to solve the above problems, the embodiments of the present application provide a display panel, a preparation method of the display panel and a display device, aiming to balance the sealing property of the frame structure and the display effect of the display panel.

[0004] The embodiments of the present application provide a display panel, comprising: a display area and a frame area surrounding the display area; the display panel comprises, in the frame area:

[0005] a first substrate and a second substrate opposite to the first substrate;

[0006] a first frame glue and a second frame glue surrounding the first frame glue, located between the first substrate and the second substrate, used for bonding the first substrate and the second substrate.

[0007] Optionally, the difference ratio of the cell thickness of the display panel in the frame area to the cell thickness of the display panel in the display area is less than 0.1%.

[0008] The difference ratio is the ratio of the absolute value of the difference between the cell thickness of the display panel in the frame area and the cell thickness of the display panel in the display area to the cell thickness of the display panel in the display area.

[0009] Optionally, the display panel further comprises: a first support area between the display area and the frame area; the display panel comprises, in the first support area: a first substrate extending to the first support area, a second substrate extending to the first support area, and a support structure located between the first substrate and the second substrate.

[0010] The thickness of the first frame glue and the thickness of the second frame glue are equal to the thickness of the support structure.

[0011] Optionally, the support structure comprises: a silicon ball;

[0012] The thickness of the first and second sealing adhesives is equal to the diameter of the silicon sphere.

[0013] Optionally, the orthographic projections of the first sealing adhesive on the second substrate and the second sealing adhesive on the second substrate overlap.

[0014] Optionally, in the direction perpendicular to the coating direction of the first sealant and the second sealant, the overlap size of the orthographic projection of the first sealant on the first substrate and the orthographic projection of the second sealant on the first substrate is greater than 30 μm and less than 50 μm.

[0015] Optionally, a gap exists between the first sealant, the second sealant, and the second substrate along the coating direction of the first sealant and the second sealant.

[0016] Optionally, in the direction perpendicular to the coating direction of the first and second sealant, the width of the orthographic projection of the first and second sealant onto the second substrate is greater than or equal to 1.7 mm.

[0017] Optionally, the first substrate includes a color filter, and the second substrate includes a thin-film transistor.

[0018] Through the above embodiments, this application provides a display panel that uses a first and a second sealant arranged in parallel to encapsulate the frame area of ​​the display panel. Compared with related technologies that provide a ring of sealant around the edges of the first and second substrates, the embodiments of this application have the following advantages:

[0019] (1) A wider sealing adhesive structure has been achieved, which helps to achieve a better sealing effect, strengthen the structural strength, and prevent the internal components of the display panel from being corroded by external moisture.

[0020] (2) Since the first and second sealant are formed separately, they can be completed by non-centralized dispensing, which can prevent the first and second substrates from being squeezed during processing, causing the sealant's adhesive structure to bulge and resulting in unevenness of the substrate, thereby improving the display effect of the display panel.

[0021] (3) It is beneficial to pre-spread the width of the adhesive during the processing, making it easier to accurately control the width of the sealing adhesive. This helps to control the bezel of the display device and achieve a narrow bezel design while ensuring sealing and display effect.

[0022] In summary, the display panel provided in this application embodiment not only takes into account both the sealing of the frame structure and the display effect of the display panel, but also helps to realize the narrow bezel design of the display device.

[0023] This application also provides a method for manufacturing a display panel, including:

[0024] A first substrate and a second substrate are provided, wherein the first substrate includes: a first position located around an edge on one side surface, and a second position located around the first position on the same side surface.

[0025] A first colloid is applied at the first location, and a second colloid is applied at the second location;

[0026] The first colloid and the second colloid are bonded together with the bonding surface of the second substrate.

[0027] The first colloid and the second colloid are cured to obtain the display panel.

[0028] Optionally, the distance between the first position and the second position is equal everywhere.

[0029] Optionally, the distance between the first colloid and the second colloid is greater than or equal to 300 μm and less than or equal to 360 μm.

[0030] Optionally, the step of bonding the first substrate and the second substrate with the adhesive surfaces of the first adhesive and the second adhesive facing the second substrate includes:

[0031] Based on the first alignment mark on the first substrate and the second alignment mark on the second substrate, the first adhesive and the second adhesive are aligned and placed with the adhesive surface of the second substrate facing the second substrate.

[0032] Adhere the first substrate and the second substrate;

[0033] Wherein, after the first substrate and the second substrate are aligned and placed, and before the first substrate and the second substrate are bonded, the cross-sectional shapes of the first adhesive and the second adhesive along the coating vertical direction are approximately two isosceles trapezoids that do not interfere with each other.

[0034] Optionally, the two isosceles trapezoids are the same size, wherein the lower base of the isosceles trapezoid is close to the first substrate, and the upper base of the isosceles trapezoid is close to the second substrate.

[0035] Optionally, the length of the lower base of the isosceles trapezoid is greater than or equal to 150 μm and less than or equal to 230 μm; the length of the upper base of the isosceles trapezoid is greater than or equal to 100 μm and less than or equal to 150 μm.

[0036] Through the above embodiments, this application provides a method for manufacturing a display panel, in which two rings of adhesive are coated between the edges of a first substrate and a second substrate to obtain a display panel. Therefore, compared to related technologies that coat only one ring of adhesive between the edges of the first and second substrates, the embodiments of this application have the following advantages:

[0037] (1) Two rings of adhesive are coated between the edges of the first substrate and the second substrate to achieve a wider sealant structure, which helps to achieve a better sealing effect, strengthen the structural strength, and prevent the internal components of the display panel from being corroded by external moisture.

[0038] (2) It realizes non-centralized dispensing, distributes the dispensing thickness of the sealant, and can easily squeeze the first and second colloids between the first and second substrates during the bonding process of the first substrate and the second substrate, and disperse the first and second colloids to obtain a thinner sealant structure, preventing the sealant structure from bulging and causing unevenness of the substrate, thereby improving the display effect of the display panel.

[0039] (3) Since liquid sealant has fluidity, it is difficult to control the width of the overflow within an extremely fine range. If the glue is too thick and too concentrated, the width of the overflow needs to be larger, which can easily lead to inconsistent width of sealant in different places. The embodiments of this application pre-allocate the width of the glue, making it easier to achieve precise control of the width of the sealant. This helps to control the bezel of the display device and achieve a narrow bezel design while ensuring sealing and display effect.

[0040] In summary, the method for manufacturing a display panel provided in this application not only takes into account both the sealing of the frame structure and the display effect of the display panel, but also helps to achieve a narrow bezel design for the display device.

[0041] This application also provides a display device, including a display panel as described in any of the above embodiments.

[0042] Through the above embodiments, this application provides a display device including a display panel as described in any of the above embodiments, which has the same or similar advantages. This display device can not only take into account the sealing performance of the frame structure and the display effect, but also make it easier to achieve a narrow bezel design. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the enclosure structure of a display panel in related technologies;

[0044] Figure 2 This is a trend diagram of the inter-cell height of a display panel frame structure in related technologies;

[0045] Figure 3 This is a schematic diagram of the structure of a display panel provided in an embodiment of this application;

[0046] Figure 4 This is a flowchart illustrating the steps of a method for manufacturing a display panel according to an embodiment of this application;

[0047] Figure 5 This is a schematic diagram of a dispensing position provided in an embodiment of this application;

[0048] Figure 6 This is a schematic diagram of a substrate alignment and placement structure provided in an embodiment of this application.

[0049] Figure label:

[0050] 10. First substrate; 11. First position; 12. Second position; 20. Second substrate; 31. First colloid; 32. Second colloid; 41. First sealing adhesive; 42. Second sealing adhesive; 50. Support structure. Detailed Implementation

[0051] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. In addition, the accompanying drawings are only schematic illustrations of this application and are not necessarily drawn to scale. The same reference numerals in the drawings indicate the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0052] In related technologies, due to the unique environmental, mechanical, and overall reliability testing requirements of display panel products, such as the need for sufficient adhesive width for the peripheral sealant of large-size display panels, the dispensing volume can be increased by reducing the travel speed of the dispensing equipment during the dispensing process and continuously accumulating the wet adhesive height. This allows for the achievement of a large adhesive width structure through a larger amount of adhesive.

[0053] However, refer to Figure 1 , Figure 1 This is a structural diagram of a display panel frame structure in related technologies. For example... Figure 1As shown, the seal area is the dispensing area for the sealing adhesive, the dummy area and glass dummy area are the support areas, and the AA area is the display area. The inventors discovered that the wide-width liquid sealing adhesive has a larger width, area, and height, resulting in greater support force than the narrow-width liquid sealing adhesive, and making it less prone to normal compression during the substrate bonding process. If the liquid sealing adhesive cannot be completely squeezed out by the vacuum equipment, after the bonding process is completed and the final curing process is completed, it becomes a solid sealing adhesive with a thickness much greater than the thickness of the support structure between the substrate and the substrate.

[0054] Reference Figure 2 , Figure 2 This is a structural diagram of a display panel frame structure in related technologies. For example... Figure 2 As shown, the cell gap is the internal height of the display panel. The inventors discovered that the higher cell thickness in the peripheral bezel area of ​​the display panel is due to the greater internal height of this area, which is related to the thickness of the sealant application. This resulting substrate deformation affects the optical performance of the display panel, thus impacting its display quality. For example, if one side of the substrate is a color filter, the color filter may deform under the pressure of the cured, raised sealant, leading to yellowing and other defects in the peripheral gap, further affecting the display panel's performance. Therefore, it is currently difficult to simultaneously achieve both the sealing properties of the bezel structure and the display effect of the display panel.

[0055] The embodiments of this application will now be described with reference to the accompanying drawings:

[0056] Reference Figure 3 , Figure 3 This is a cross-sectional structural diagram of a display panel provided in an embodiment of this application. Figure 3 As shown, this application embodiment provides a display panel, including: a display area and a frame area surrounding the display area.

[0057] The display area is used to display images on the display panel, while the area on the display panel not used for displaying images can be called the non-display area. The frame area can be a part of the non-display area and is used to frame the display panel. For example, the display area can be rectangular or circular, and the frame area can be a square or annular ring surrounding the display area.

[0058] Specifically, the display panel in the frame area includes:

[0059] A first substrate 10 and a second substrate 20 that is aligned with the first substrate 10.

[0060] Considering that in related technologies, display panels employing color filter structures often suffer from uneven thickness between the sealant application location and the surrounding area due to the process and material characteristics of the sealant, the flatness of the color filter is affected, leading to problems such as yellowing of the perimeter gaps in the display panel and impacting display performance. To address this issue, this application can be applied to cell-encapsulated color filters and thin-film transistors. Therefore, in one optional embodiment, the first substrate 10 includes a color filter, and the second substrate 20 includes a thin-film transistor.

[0061] The display panel also includes, in the frame area, a first frame adhesive 41 and a second frame adhesive 42 surrounding the first frame adhesive 41, located between the first substrate 10 and the second substrate 20, for bonding the first substrate 10 and the second substrate 20.

[0062] Therefore, in this embodiment of the application, the display panel includes the following in the frame area:

[0063] A first sealing adhesive 41, a second sealing adhesive 42, and a first substrate 10 and a second substrate 20 bonded together by the first sealing adhesive 41 and the second sealing adhesive 42.

[0064] The first sealing adhesive 41 is obtained by curing the first adhesive 31, and the second sealing adhesive 42 is obtained by curing the second adhesive 32.

[0065] Specifically, the first sealing adhesive 41 or the second sealing adhesive 42 can be a solid sealant that can be used to bond the first substrate 10 and the second substrate 20. It can not only support the sealing structure, but also prevent external moisture from entering the display panel.

[0066] Through the above embodiments, the first sealant 41 and the second sealant 42 are obtained by extruding and curing two parallel first colloids 31 and the second colloid 32 around the edge of the display panel. They work together to seal the display panel. Compared with a single sealant dispensing method, a thinner and wider sealant colloid can be formed, which takes into account both the sealing effect of the liquid crystal panel and the display effect of the display panel.

[0067] In an optional embodiment, this application also provides a display panel, wherein the difference between the cell thickness of the display panel in the frame region and the cell thickness in the display region is less than 0.1%.

[0068] The difference ratio is the absolute value of the difference between the box thickness of the frame area and the box thickness of the display panel in the display area, and the ratio of the difference to the box thickness of the display panel in the display area.

[0069] The thickness of the box in the sealing area can be the sum of the following: the thickness of the first substrate 10, the thickness of the second substrate 20, and the thickness of the sealing adhesive formed by the combination of the first sealing adhesive 41 and the second sealing adhesive 42.

[0070] The thickness of the display area can be the sum of the following: the thickness of the first substrate 10, the thickness of the second substrate 20, and the thickness of the support structure 50 between the first substrate 10 and the second substrate 20.

[0071] In this application embodiment, in addition to the display area including the support structure 50, more support structures 50 can be provided for other areas. Therefore, in an optional embodiment, this application also provides a display panel, which further includes a first support area located between the display area and the frame area.

[0072] The display panel in the first support area includes: a first substrate 10 extending to the first support area, a second substrate 20 extending to the first support area, and a support structure 50 located between the first substrate 10 and the second substrate 20.

[0073] The thickness of the first sealing adhesive 41 and the thickness of the second sealing adhesive 42 are equal to the thickness of the supporting structure 50.

[0074] By adding more support structures 50, the thickness of the frame structure is made uniform throughout, preventing deformation of the substrate and thus achieving a better display effect.

[0075] In an alternative embodiment, this application also provides a display panel, further comprising: a second support region located on the side of the frame region away from the display region. The second support region may also include a support structure 50 for further enhancing the structural strength of the frame structure and controlling the thickness accuracy of the frame structure.

[0076] In an alternative embodiment, this application also provides a display panel, further comprising: a blank area located between the first support area and the frame area, used as a structural buffer strip.

[0077] This application also considers using silicon balls as a support structure 50 between the first substrate 10 and the second substrate 20 to control the thickness of the enclosure structure. To this end, in an optional embodiment, this application also provides a display panel, wherein the support structure 50 includes silicon balls.

[0078] Furthermore, in order to achieve high flatness of the first substrate 10 and the second substrate 20, in one optional embodiment of this application, the thickness of the first sealant 41 and the second sealant 42 is equal to the diameter of the silicon ball.

[0079] In one alternative embodiment, the diameter of the silicon ball can be 4.5 μm, and the thickness of the first sealing adhesive 41 and the second sealing adhesive 42 can also be 4.5 μm.

[0080] This application considers that the first sealing adhesive 41 and the second sealing adhesive 42 can work together to form a complete sealing adhesive to seal the liquid crystal panel. Therefore, in an optional embodiment, the orthographic projection of the first sealing adhesive 41 on the first substrate 10 and the orthographic projection of the second sealing adhesive 42 on the first substrate 10 overlap.

[0081] Specifically, during the manufacturing process of the display panel, the first colloid 31 and the second colloid 32 can flow under the pressure of the first substrate 10 and the second substrate 20, thereby completing interference overlap. The first sealant 41 and the second sealant 42, which are cured separately, also interfere overlap to form a complete sealant, which plays a unified sealing role.

[0082] In this embodiment of the application, the overlap of the first sealing adhesive 41 and the second sealing adhesive 42 may include any of the following: mutual fusion, mutual coverage, and mutual compression.

[0083] Furthermore, in an optional embodiment, in the direction perpendicular to the coating direction of the first sealant 41 and the second sealant 42, the overlap size of the orthographic projection of the first sealant 41 on the first substrate 10 and the orthographic projection of the second sealant 42 on the first substrate 10 is greater than 30 μm and less than 50 μm.

[0084] For example, the overlap size of the orthographic projection of the first sealing adhesive 41 on the first substrate 10 and the orthographic projection of the second sealing adhesive 42 on the first substrate 10 can be 40 μm.

[0085] Considering that excessive overlap between the first sealant 41 and the second sealant 42 may cause excessive interference and lead to protrusion of the substrate in the adhesive overlap area, the amount of interference overlap between the first sealant 41 and the second sealant 42 can be limited. Therefore, in an optional embodiment, a gap exists between the first sealant 41, the second sealant 42, and the second substrate 20 along the coating direction of the first sealant 41 and the second sealant 42.

[0086] Specifically, the amount of adhesive and the dispensing distance can be set according to the fluidity and surface tension of the first colloid 31 and the second colloid 32, and the extrusion pressure of the first substrate 10 and the second substrate 20 can be controlled so that the overlap of the first sealing adhesive 41 and the second sealing adhesive 42 is in a suitable position, thereby creating a gap between the first sealing adhesive 41, the second sealing adhesive 42 and the second substrate 20 along the coating direction of the first sealing adhesive 41 and the second sealing adhesive 42.

[0087] Through the above embodiments, the first sealing adhesive 41 and the second sealing adhesive 42 can interfere and overlap, but not excessively interfere and overlap. That is, without causing deformation to the substrate, a relatively complete sealing adhesive is formed, resulting in a better sealing effect.

[0088] In another alternative embodiment, there may be no gap between the first sealing adhesive 41, the second sealing adhesive 42 and the second substrate 20, that is, the first sealing adhesive 41 and the second sealing adhesive 42 are completely fused together, forming a more uniform adhesive structure between the first substrate 10 and the second substrate 20, which can achieve a better sealing effect.

[0089] Furthermore, in an optional embodiment, the width of the orthographic projection of the first sealant 41 and the second sealant 42 onto the second substrate 20 is greater than or equal to 1.7 mm in the direction perpendicular to the coating direction of the first sealant 41 and the second sealant 42.

[0090] For example, the width of the orthographic projection of the first sealing adhesive 41 and the second sealing adhesive 42 on the second substrate 20 can be 1.8 mm.

[0091] Reference Figure 4 , Figure 4 This is a flowchart illustrating the steps of a method for manufacturing a display panel according to an embodiment of this application. Figure 4 As shown, in conjunction with the above embodiments and based on a similar inventive concept, this application also provides a method for manufacturing a display panel, including:

[0092] Step S301, a first substrate 10 and a second substrate 20 are provided, wherein the first substrate 10 includes: a first position 11 located around the edge of one side surface, and a second position 12 located around the first position 11 on the same side surface.

[0093] Considering that adhesive can be applied to a substrate with higher hardness first, in one alternative embodiment, the first substrate 10 includes a color filter, and the second substrate 20 includes a thin-film transistor.

[0094] Reference Figure 5 , Figure 5 This is a schematic diagram of a dispensing position provided in an embodiment of this application. For example... Figure 5 As shown, the pattern formed around the edge of one side surface of the first substrate 10 by the first position 11 or the second position 12 can be a closed pattern or a non-closed pattern to adapt to the packaging design requirements of the substrate.

[0095] In one alternative implementation, the distance between the first position 11 and the second position 12 is equal everywhere.

[0096] The fact that the distance between the first position 11 and the second position 12 is equal everywhere can mean that the minimum distance between the first position 11 and the second position 12 is equal everywhere. For example, the first position 11 and the second position 12 can be a rectangle or a circle with the same geometric center, respectively. The shape and position of the first position 11 and the second position 12 can be specifically determined according to the shape of the first substrate 10 or the second substrate 20.

[0097] Specifically, the distance between the first position 11 and the second position 12 can be a distance that prevents the liquid first colloid 31 and the second colloid 32 from contacting each other, and allows the sealant obtained after the first colloid 31 and the second colloid 32 have cured to overlap and contact each other. For example, the distance between the first position 11 and the second position 12 can be greater than or equal to 480 μm and less than or equal to 560 μm.

[0098] Step S302: Apply a first colloid 31 to the first position 11 and apply a second colloid 32 to the second position 12.

[0099] Considering the material properties of the first substrate 10 and the second substrate 20, excessive pressure cannot be applied to cause the first colloid 31 and the second colloid 32 to flow and diffuse, resulting in a colloid structure with a large adhesive width. Therefore, in order to ensure that the first colloid 31 and the second colloid 32 are compressed during substrate bonding, the thickness of the first colloid 31 or the thickness of the second colloid 32 does not exceed a preset thickness value. The substrate can be either the first substrate 10 or the second substrate 20.

[0100] Reference Figure 6 , Figure 6 This is a schematic diagram of a substrate alignment and placement structure provided in an embodiment of this application. For example... Figure 6 As shown, in an optional embodiment, after the first substrate 10 and the second substrate 20 are aligned and placed, the thickness of the first adhesive 31 or the thickness of the second adhesive 32 is less than 30 μm. For example, after the first substrate 10 and the second substrate 20 are aligned and placed, the thickness of the first adhesive 31 or the thickness of the second adhesive 32 is 15 μm. In related technologies, to achieve a large adhesive width, a large dispensing thickness, greater than 30 μm, is often used, which is difficult to compress. Therefore, the embodiments of this application can help avoid excessively thick adhesive in the sealing area, thus avoiding adverse effects on the display effect.

[0101] Specifically, the first colloid 31 is coated on the first position 11, and the second colloid 32 is coated on the second position 12. The order in which these two processes are performed is not limited in this embodiment. That is, in this embodiment, the first colloid 31 can be coated on the first position 11 first, and then the second colloid 32 can be coated on the second position 12; alternatively, the second colloid 32 can be coated on the second position 12 first, and then the first colloid 31 can be coated on the first position 11.

[0102] Specifically, the first colloid 31 and the second colloid 32 can be liquid colloids of the same material. Specifically, for application in the frame structure, the first colloid 31 and / or the second colloid 32 can be sealants; that is, at least one of the first colloid 31 and the second colloid 32 is a sealant. When both the first colloid 31 and the second colloid 32 are sealants, they can work together after curing to achieve a sealing effect on the frame structure in the display panel.

[0103] The first colloid 31 or the second colloid 32 can be applied by dispensing the colloid using a needle, forming a coating path with the same geometric center at the first position 11 and the second position 12.

[0104] By controlling the dispensing speed of the needle to remain consistent, and ensuring that the speeds of applying the first adhesive 31 and the second adhesive 32 are the same, the amount of adhesive applied to both 31 and 32 is equal at all points, resulting in a uniform cell thickness for the subsequently obtained display panel. For example, assuming that the first adhesive 31 and the second adhesive 32 can be made of the same liquid adhesive material with identical material properties, then the thickness of the first adhesive 31 and the second adhesive 32 will be the same at all points.

[0105] In step S303, the first colloid 31 and the second colloid 32 are placed toward the adhesive surface of the second substrate 20 to bond the first substrate 10 and the second substrate 20.

[0106] In the embodiments of this application, the first substrate 10 and the second substrate 20 may have the same shape and may be used for encapsulation of a box. For example, the first substrate 10 and the second substrate 20 may be rectangles with the same shape, or they may be circles with the same shape.

[0107] In this embodiment, alignment marks can be pre-set on the first substrate 10 and the second substrate 20. The first adhesive 31 and the second adhesive 32 can be aligned with the adhesive surfaces of the second substrate 20 based on the alignment marks. Alignment can be achieved by making the first substrate 10 and the second substrate 20 parallel, and aligning the geometric centers of the first substrate 10 and the second substrate 20.

[0108] For example, assuming that the first substrate 10 and the second substrate 20 are rectangles with the same shape, the geometric center of the first substrate 10 and the geometric center of the second substrate 20 can be aligned by the alignment marks on the first substrate 10 and the second substrate 20, and the first substrate 10 and the second substrate 20 are parallel, thereby achieving rectangular alignment.

[0109] In this process, pressure and / or heat can be applied to either the first substrate 10 or the second substrate 20 by applying pressure or hot pressing, causing the first colloid 31 and the second colloid 32 to diffuse and flow to both sides and reduce their thickness. This makes the cell thickness of the area where the first colloid 31 and the second colloid 32 are located consistent with the cell thickness of the display panel in the display area, so that the flatness of the first substrate 10 or the second substrate 20 reaches the target flatness, and the first colloid 31 and the second colloid 32 bond the first substrate 10 and the second substrate 20 together.

[0110] The target flatness can be the flatness of the first substrate 10 or the second substrate 20 when the difference between the cell thickness of the area where the first colloid 31 and the second colloid 32 are located and the cell thickness of the display panel in the display area is less than a target ratio. For example, the target ratio can be 0.05%.

[0111] Step S304: Cure the first colloid 31 and the second colloid 32 to obtain the display panel.

[0112] Specifically, either drying heat curing or ultraviolet light curing can be used to cure the first colloid 31 and the second colloid 32.

[0113] In this application embodiment, the display panel can be a liquid crystal panel, which may include a sealing adhesive structure. This sealing adhesive structure can complete the encapsulation of the liquid crystal cell using the sealing adhesive. Therefore, the display panel in this application is a sealing adhesive structure, which can be obtained by encapsulating two substrates together. It may include at least a first substrate 10, a second substrate 20 encapsulated with the first substrate 10, and a sealing adhesive obtained by curing a first adhesive 31 and a second adhesive 32.

[0114] Through the above embodiments, this application utilizes two rings of adhesive coated between the edges of the first substrate 10 and the second substrate 20 to obtain a display panel. By coating with dual-strand sealant, the problem of uneven sealant thickness caused by adhesive protrusion in the dispensing area of ​​the display panel during encapsulation can be addressed. Reducing the thickness of the liquid adhesive makes it easier to compress during encapsulation, helping to ensure that the cured sealant thickness is close to the thickness of the support structure 50 in the display area. Simultaneously, the dual-strand liquid adhesive can fuse together under the compression of the substrates, resulting in a wider sealant structure and achieving a better sealing effect. Therefore, this application not only obtains a wider sealant but also improves the substrate protrusion caused by excessively thick sealant that is difficult to compress. The uniform thickness of the sealant structure can improve or even solve the problem of gap-induced yellowing around the display panel, thus balancing the sealing effect of the sealant and the display effect of the display panel.

[0115] In this embodiment of the application, in order to prevent the liquid first colloid 31 and the second colloid 32 from contacting each other, and to allow the sealing adhesive obtained after the first colloid 31 and the second colloid 32 are cured to overlap and contact each other, the distance between the first colloid 31 and the second colloid 32 can be determined based on the surface tension of the first colloid 31 and the second colloid 32 in the liquid state, their fluidity on the first substrate 10, and their fluidity when subjected to heat and pressure between the first substrate 10 and the second substrate 20. Similarly, the distance between the first position 11 and the second position 12 can also be determined based on the above factors.

[0116] In one alternative embodiment, the distance between the first colloid 31 and the second colloid 32 is greater than or equal to 300 μm and less than or equal to 360 μm.

[0117] Furthermore, the minimum distance between the first colloid 31 and the second colloid 32 can be 330 μm.

[0118] The distance between the first colloid 31 and the second colloid 32 can be the minimum distance between them. For example, if the cross-sectional shape of the first colloid 31 and the second colloid 32 along the vertical direction of coating is a trapezoid with its base sides on the same straight line, then the distance between the first colloid 31 and the second colloid 32 is the distance between them along the straight line containing the lower base sides of the two trapezoids.

[0119] Considering the characteristics of the process and processing requirements, in order to achieve a higher flatness of the first substrate 10 or the second substrate 20, a more precise dispensing needle can be selected to obtain a regularly shaped dispensing. Taking into account the surface tension characteristics of the liquid, the first adhesive 31 and the second adhesive 32 are symmetrical about their respective centers along the coating direction. Therefore, in an optional embodiment, this application also provides an bonding method, including:

[0120] Step S401: Based on the first alignment mark on the first substrate 10 and the second alignment mark on the second substrate 20, the first colloid 31 and the second colloid 32 are aligned and placed toward the adhesive surface of the second substrate 20.

[0121] The first alignment mark or the second alignment mark can be a cross mark on the first substrate 10. The cross mark can be obtained by laser etching or chemical etching. By aligning the first alignment mark on the first substrate 10 and the second alignment mark on the second substrate 20 using a visual alignment device, the first substrate 10 and the second substrate 20 can be aligned.

[0122] Step S402: Bond the first substrate 10 and the second substrate 20 together.

[0123] Specifically, a seal can be achieved by applying opposing pressure to either the first substrate 10 or the second substrate 20, bringing them closer together and bonding them together with the first adhesive 31 and the second adhesive 32. Under pressure, the first adhesive 31 and the second adhesive 32 can flow, causing the adhesive to become thinner and wider.

[0124] Wherein, after the first substrate 10 and the second substrate 20 are aligned and placed, and before the first substrate 10 and the second substrate 20 are bonded, the cross-sectional shape of the first colloid 31 and the second colloid 32 along the coating vertical direction is approximately two isosceles trapezoids that do not interfere with each other.

[0125] The first colloid 31 can be approximated as an isosceles trapezoid, and the second colloid 32 can be approximated as another isosceles trapezoid. The two isosceles trapezoids do not contact each other on the plane of the cross section.

[0126] Here, "approximately isosceles trapezoid" refers to the outer contour of the cross-section of the first colloid 31 and the second colloid 32 along the coating vertical direction being approximately an isosceles trapezoid. Specifically, the minimum distance between the outer contour of the cross-section of the first colloid 31 and the second colloid 32 along the coating vertical direction and the edge of their respective approximate isosceles trapezoids can not exceed 10 μm.

[0127] Furthermore, by controlling the dispensing speed and dispensing height, the cross-sectional shapes of the first adhesive 31 and the second adhesive 32 along the coating vertical direction can be made identical. To this end, in an optional embodiment, the two isosceles trapezoids are of the same size, wherein the lower base of the isosceles trapezoid is closer to the first substrate 10, and the upper base of the isosceles trapezoid is closer to the second substrate 20.

[0128] Specifically, when the first colloid 31 and the second colloid 32 have the same cross-sectional shape along the vertical direction of coating, and are two isosceles trapezoids with their bases approximately on the same straight line, the colloids can flow to both sides in the same or similar manner during the bonding process of the first substrate 10 and the second substrate 20, and form a relatively regular overlap, thus achieving a stable sealing effect.

[0129] Insufficient sealant results in poor sealing; excessive sealant requires more bezel width on the display panel, affecting the overall visual effect of the display device. Therefore, the amount of sealant applied to the first adhesive 31 and the second adhesive 32 needs to be controlled. In one optional embodiment, the length of the lower base of the isosceles trapezoid is greater than or equal to 150 μm and less than or equal to 230 μm; the length of the upper base of the isosceles trapezoid is greater than or equal to 100 μm and less than or equal to 150 μm.

[0130] Through the above embodiments, by utilizing liquid tension and dispensing shape, the shape of the adhesive between the first substrate 10 and the second substrate 20 can be controlled to a suitable width and height, so that the adhesive used as a sealing adhesive can take into account the sealing effect, display effect and the overall visual effect of the display device.

[0131] In conjunction with the above embodiments, and based on similar inventive concepts, this application also provides a display device, including a display panel as described in any of the above embodiments.

[0132] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0133] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0134] The above provides a detailed description of a display panel, a method for preparing the display panel, and a display device provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

[0135] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0136] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

[0137] The terms "an embodiment," "embodiment," or "one or more embodiments" as used herein mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Furthermore, please note that the examples of the phrase "in one embodiment" do not necessarily all refer to the same embodiment.

[0138] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of this application may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0139] In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. This application can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

[0140] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A display panel, characterized in that, include: The display area, and the framed area surrounding the display area; The display panel includes the following components in the frame area: A first substrate and a second substrate that is paired with the first substrate; A first sealing adhesive and a second sealing adhesive surrounding the first sealing adhesive are located between the first substrate and the second substrate for bonding the first substrate and the second substrate; The orthographic projections of the first sealing adhesive on the first substrate and the orthographic projections of the second sealing adhesive on the first substrate overlap; In the direction perpendicular to the coating direction of the first sealant and the second sealant, the overlap size of the orthographic projection of the first sealant on the first substrate and the orthographic projection of the second sealant on the first substrate is greater than 30 μm and less than 50 μm. Along the coating direction of the first sealant and the second sealant, there is a gap between the first sealant, the second sealant and the second substrate.

2. A display panel according to claim 1, characterized in that, The difference between the thickness of the display panel in the frame area and the thickness of the display panel in the display area is less than 0.1%; The difference ratio is the absolute value of the difference between the box thickness of the display panel in the frame area and the box thickness of the display panel in the display area, and the ratio of the box thickness of the display panel in the display area.

3. A display panel according to claim 2, characterized in that, The display panel further includes: a first support region located between the display area and the frame area; the display panel in the first support region includes: a first substrate extending to the first support region, a second substrate extending to the first support region, and a support structure located between the first substrate and the second substrate; The thickness of the first and second sealing adhesives is equal to the thickness of the supporting structure.

4. A display panel according to claim 3, characterized in that, The support structure includes: silicon spheres; The thickness of the first and second sealing adhesives is equal to the diameter of the silicon sphere.

5. A display panel according to claim 1, characterized in that, Perpendicular to the coating direction of the first and second sealant, the width of the orthographic projection of the first and second sealant onto the second substrate is greater than or equal to 1.7 mm.

6. A display panel according to any one of claims 1 to 5, characterized in that, The first substrate includes a color filter, and the second substrate includes a thin-film transistor.

7. A method for manufacturing a display panel according to any one of claims 1 to 6, characterized in that, include: A first substrate and a second substrate are provided, wherein the first substrate includes: a first position located around an edge on one side surface, and a second position located around the first position on the same side surface. A first colloid is applied at the first location, and a second colloid is applied at the second location; The first colloid and the second colloid are bonded together with the bonding surface of the second substrate. The first colloid and the second colloid are cured to obtain the display panel.

8. A method for manufacturing a display panel according to claim 7, characterized in that, The distance between the first position and the second position is equal everywhere.

9. A method for manufacturing a display panel according to claim 7, characterized in that, The distance between the first colloid and the second colloid is greater than or equal to 300 μm and less than or equal to 360 μm.

10. A method for manufacturing a display panel according to claim 7, characterized in that, The step of bonding the first colloid and the second colloid to the bonding surface of the second substrate, and bonding the first substrate and the second substrate together, includes: Based on the first alignment mark on the first substrate and the second alignment mark on the second substrate, the first adhesive and the second adhesive are aligned and placed with the adhesive surface of the second substrate facing the second substrate. Adhere the first substrate and the second substrate; Wherein, after the first substrate and the second substrate are aligned and placed, and before the first substrate and the second substrate are bonded, the cross-sectional shapes of the first adhesive and the second adhesive along the coating vertical direction are approximately two isosceles trapezoids that do not interfere with each other.

11. A method for manufacturing a display panel according to claim 10, characterized in that, The two isosceles trapezoids are the same size, wherein the lower base of the isosceles trapezoid is close to the first substrate, and the upper base of the isosceles trapezoid is close to the second substrate.

12. The method for manufacturing a display panel according to claim 11, characterized in that, The length of the lower base of the isosceles trapezoid is greater than or equal to 150 μm and less than or equal to 230 μm; the length of the upper base of the isosceles trapezoid is greater than or equal to 100 μm and less than or equal to 150 μm.

13. A display device, characterized in that, Includes a display panel as described in any one of claims 1 to 6.

Images