Display module, preparation method thereof and display device

Abstract

The invention relates to a display module, a preparation method thereof and a display device. The display module comprises a display panel; the light transmitting part is arranged on the light emitting side of the display panel; the attaching layer is located between the display panel and the light transmitting part and comprises a transparent layer and a light shielding layer, the transparent layer is located in the display area, and the light shielding layer is located in the non-display area; wherein a micro-structure part is arranged on the light-transmitting part in the non-display area, and the micro-structure part is used for being bonded with the light shielding layer. The microstructure part is arranged on the light-transmitting part in the non-display area, the contact area between the microstructure part and the light shielding layer is increased through the microstructure part to achieve tight bonding with the light shielding layer, the stability problem of the light shielding layer in the non-display area can be effectively solved through the arrangement, the risk that the light shielding layer deforms or falls off is greatly reduced, and the display effect is improved. And the yield of the product in the manufacturing process is improved.

Description

Technical Field

[0001] The present application relates to the field of display technologies, and particularly to a display module, a preparation method thereof, and a display device. Background Art

[0002] There is a cover plate on the topmost layer of the display panel of a display. The cover plate includes a display area in the middle, a non-display area on the outer periphery of the display area, and an ink layer printed on the non-display area. During the manufacturing process of the display panel, it is necessary to pre-coat the ink layer on the inner wall surface of the cover plate in the non-display area, and then coat an OCA (Optically Clear Adhesive) optical adhesive layer on the inner surface of the display area and the ink. The cover plate is fixed on the display panel through the OCA optical adhesive layer.

[0003] However, due to the existence of the ink layer, there is an ink step difference between the display area and the non-display area of the cover plate. When the OCA optical adhesive is attached to the display area and the ink layer, air bubbles will exist in the display area, affecting the display effect. When the thickness of the OCA optical adhesive layer is thinner, its ability to fill the ink step difference is weaker, and the defective rate of the air bubbles attached in the display area becomes higher and higher.

[0004] Currently, there is a method of attaching the display panel and the cover plate using OCR (Optical Clear Resin) adhesive. However, since the area provided by the cover plate for OCR adhesive coating in the non-display area is small, and the adhesion between the OCR adhesive and the cover plate is insufficient, it is difficult to make the OCR adhesive in the non-display area exist stably, resulting in the problem of OCR adhesive deformation and low product yield. Summary of the Invention

[0005] Based on this, it is necessary to provide a display module, a preparation method thereof, and a display device, aiming to solve the problem that the adhesion between the OCR adhesive and the cover plate in the non-display area is insufficient, the OCR adhesive is not stable and deformed, resulting in low product yield.

[0006] In a first aspect, an embodiment of the present application provides a display module, which has a display area and a non-display area; the display module includes:

[0007] A display panel;

[0008] A light-transmitting member, disposed on the light-emitting side of the display panel;

[0009] An attachment layer, located between the display panel and the light-transmitting member, the attachment layer includes a transparent layer and a light-shielding layer, the transparent layer is located in the display area, and the light-shielding layer is located in the non-display area;

[0010] Wherein, a microstructure portion is provided on the light-transmissive member located in the non-display area, and the microstructure portion is used for bonding the light-shielding layer.

[0011] In a second aspect, an embodiment of the present application further provides a method for manufacturing a display module, which is applied to the display module in the above embodiment. The manufacturing method includes:

[0012] Providing a light-transmissive member, and providing a microstructure portion in the non-display area of the light-transmissive member;

[0013] Providing a first liquid optical adhesive in the non-display area of the light-transmissive member to bond the first liquid optical adhesive through the microstructure portion, and providing a second liquid optical adhesive in the display area of the light-transmissive member; wherein, the first liquid optical adhesive includes a light-shielding material;

[0014] Providing a display panel, and attaching the display panel to the light-transmissive member.

[0015] In a third aspect, an embodiment of the present application further provides a display device, including the display module described in the above embodiment.

[0016] The display panel provided by the embodiment of the present application avoids the problem of OCA optical adhesive fitting bubbles caused by ink step difference in the conventional technology by providing a transparent layer located in the display area and a light-shielding layer located in the non-display area between the display panel and the light-transmissive member; and by providing a microstructure portion on the light-transmissive member in the non-display area, the contact area with the light-shielding layer is increased by using the microstructure portion to achieve tight bonding with the light-shielding layer. This kind of setting can effectively solve the stability problem of the light-shielding layer in the non-display area, greatly reduce the risk of deformation or detachment of the light-shielding layer, improve the yield rate of the product during the manufacturing process, reduce production costs, and improve production efficiency. Description of the Drawings

[0017] Figure 1 It is a schematic plan view of a display module provided by an embodiment of the present application.

[0018] Figure 2 It is a schematic cross-sectional view of a display module provided by an embodiment of the present application.

[0019] Figure 3 It is a schematic cross-sectional view of another display module provided by an embodiment of the present application.

[0020] Figure 4 It is a schematic flowchart of a method for manufacturing a display module provided by an embodiment of the present application.

[0021] Figure 5 It is a schematic view of the structure of a display module during the manufacturing process provided by an embodiment of the present application.

[0022] Figure 6Another structural schematic diagram of the display module provided by the embodiment of the present application during the manufacturing process.

[0023] Figure 7 A cross-sectional schematic diagram of a dam provided by the embodiment of the present application during the manufacturing process.

[0024] Figure 8 Another cross-sectional schematic diagram of a dam provided by the embodiment of the present application during the manufacturing process.

[0025] Figure 9 Another structural schematic diagram of the display module provided by the embodiment of the present application during the manufacturing process. Detailed implementation manners

[0026] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs. The terms used in the specification of the present application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0028] When describing the positional relationship, unless otherwise specified, when an element such as a layer, film or substrate is referred to as being "on" another element, it can be directly on the other element or there can also be intermediate elements. Further, when a layer is referred to as being "under" another layer, it can be directly below or there can be one or more intermediate elements. It can also be understood that when a layer is referred to as being "between" two layers, it can be the only layer between the two layers or there can also be one or more intermediate elements.

[0029] In the case of using "including", "having", and "comprising" described herein, unless an explicit limiting term is used, such as "only", "consisting of", etc., another component can also be added. Unless otherwise mentioned, terms in the singular form can include the plural form and should not be understood as having a quantity of one.

[0030] It should be understood that although terms such as "first" and "second" may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of the present application, the first element may be referred to as the second element, and similarly, the second element may be referred to as the first element.

[0031] It should also be understood that when interpreting an element, although not explicitly described, the element is interpreted as including an error range, and this error range should be within the acceptable deviation range of a specific value determined by those skilled in the art. For example, "about", "approximately" or "substantially" may mean within one or more standard deviations, which is not defined herein.

[0032] In addition, in the specification, the phrase "schematic diagram of planar distribution" refers to the attached drawing when observing the target part from above, and the phrase "schematic cross-sectional view" refers to the attached drawing when observing the cross-section intercepted by vertically cutting the target part from the side.

[0033] In addition, the attached drawings are not drawn to a scale of 1:1, and the relative sizes of the various elements are only drawn by way of example in the attached drawings and are not necessarily drawn to the actual scale.

[0034] As described in the background art section, when the display panel and the cover plate in the related art are adhered, the OCR glue located in the non-display area is not stable, resulting in a low product yield. The inventor found that the reason for the above phenomenon is that due to the existence of the ink layer, there is an ink step difference between the display area and the non-display area of the cover plate. When the OCA optical glue is adhered to the display area and the ink layer, it will cause bubbles in the display area, affecting the display effect. When the thickness of the OCA optical glue layer is thinner, its ability to fill the ink step difference is weaker, and the defective rate of the adhered bubbles in the display area is higher. When using OCR glue to adhere the display panel and the cover plate, since the area provided by the cover plate for the coating of the OCR glue in the non-display area is small, and the adhesion between the OCR glue and the cover plate is insufficient, it is difficult to make the OCR glue located in the non-display area exist stably, thus causing the problem of OCR glue deformation and resulting in a low product yield.

[0035] Based on the above technical problems, the inventor's research found that by providing a microstructural part on the light-transmitting member located in the non-display area, the stability of the OCR glue located in the non-display area can be improved. Based on this, the inventor further developed the technical solution of the embodiment of the present application. Specifically, the display module provided by the embodiment of the present application includes a display panel, a light-transmitting member, and an adhering layer. The light-transmitting member is disposed on the light-emitting side of the display panel; the adhering layer is located between the display panel and the light-transmitting member, and the adhering layer includes a transparent layer and a light-shielding layer. The transparent layer is located in the display area, and the light-shielding layer is located in the non-display area; wherein, a microstructural part is provided on the light-transmitting member located in the non-display area, and the microstructural part is used for bonding the light-shielding layer.

[0036] With the above technical solution, a transparent layer located in the display area and a light-shielding layer located in the non-display area are provided between the display panel and the light-transmitting member, so as to avoid the problem of OCA optical adhesive bonding bubbles caused by ink step difference in the traditional technology; and by providing a microstructure portion on the light-transmitting member in the non-display area, the contact area with the light-shielding layer is increased by using the microstructure portion to achieve tight bonding with the light-shielding layer. This kind of setting can effectively solve the stability problem of the light-shielding layer in the non-display area, greatly reduce the risk of deformation or detachment of the light-shielding layer, improve the yield rate of the product during the manufacturing process, reduce production costs, and improve production efficiency.

[0037] The above is the core idea of this application. Next, the technical solutions in the embodiments of this application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0038] Figure 1 It is a schematic plan view of a display module provided by an embodiment of this application. Figure 2 It is a schematic cross-sectional view of a display module provided by an embodiment of this application. Figure 3 It is a schematic cross-sectional view of another display module provided by an embodiment of this application. Combining Figures 1 to 3 As shown, the display module provided by the embodiment of this application has a display area and a non-display area. The display module may include a display panel 100, a light-transmitting member 200, and a bonding layer 300.

[0039] The light-transmitting member 200 is disposed on the light-emitting side of the display panel 100; the bonding layer 300 is located between the display panel 100 and the light-transmitting member 200. The bonding layer 300 includes a transparent layer 310 and a light-shielding layer 320. The transparent layer 310 is located in the display area, and the light-shielding layer 320 is located in the non-display area; wherein, a microstructure portion 321 is provided on the light-transmitting member 200 in the non-display area, and the microstructure portion 321 is used to bond the light-shielding layer 320.

[0040] It can be understood that the display panel 100 can be various types of display panels 100, such as an OLED (Organic Light-Emitting Diode) display panel 100, a liquid crystal display panel 100, etc., which will not be specifically described herein. As the core component of the display module, the display panel 100 can control the light-emitting state of pixels through electrical signals to achieve image display. In this embodiment, the display module is divided into a display area and a non-display area. The display area is mainly used to present visible information such as images and texts, and is the part for directly observing and obtaining the display content; the non-display area is located on the outer periphery of the display area and is usually used to accommodate non-display related components such as a border, circuit traces, and sensors, and does not directly participate in the image display function.

[0041] In addition, the light-transmitting member 200 is a transparent component disposed on the light-emitting side of the display panel 100, which is used to protect the display panel 100 and ensure that the light emitted by the display panel 100 can pass through smoothly and reach the user's eyes. The light-transmitting member 200 in this embodiment can be a polarizer (POL), a lens, or a cover plate, which is not limited herein.

[0042] The bonding layer 300 is located between the display panel 100 and the light-transmitting member 200 and is used to firmly bond the two together. The bonding layer 300 is divided into a transparent layer 310 and a light-shielding layer 320. The transparent layer 310 can ensure good light transmission in the display area, and the light-shielding layer 320 is used to block the light in the non-display area to prevent light leakage. Among them, the transparent layer 310 can adopt a liquid optical clear resin (OCR), etc., which has a high light transmittance and can ensure the clear presentation of the display content. The light-shielding layer 320 can be composed of an OCR glue containing pigments. For example, the OCR acrylic glue can change its color by adding pigments, dyes, and toners. Specifically, the pigment is a colored substance insoluble in the medium and can be mixed with the medium to form a colored substance; the dye is a substance that can dissolve in the medium and present a color; the toner is a substance that can adjust the color depth and hue. The addition of these additives can change the color of the OCR acrylic glue to meet different requirements and replace the ink by adjusting the color of the glue.

[0043] The micro-structure part 321 in this embodiment is disposed on the light-transmitting member 200 in the non-display area. The micro-structure part 321 is a specific structure disposed on the light-transmitting member 200 in the non-display area, which is a structure with tiny protrusions, grooves, or other shapes on the surface. More specifically, the micro-structure part 321 can include a groove array, a frosted rough surface, micro-columns, etc., which are used to enhance the contact area and bonding strength with the light-shielding layer 320 to ensure that the light-shielding layer 320 can be firmly attached to the light-transmitting member 200.

[0044] In this embodiment, the display panel 100 is located at the bottom layer, the light-transmissive member 200 covers its light-emitting side, and the bonding layer 300 is sandwiched between the display panel 100 and the light-transmissive member 200, including a transparent layer 310 and a light-shielding layer 320. The micro-structure part 321 is disposed on the inner surface of the non-display area of the light-transmissive member 200, in direct contact with and mechanically engaged with the light-shielding layer 320. The light-shielding layer 320 is fixed on the light-transmissive member 200 through the micro-structure part 321, which can prevent the colloid from shifting or peeling. In other words, the setting of the micro-structure part 321 increases the contact area and mechanical interlocking effect (such as groove fitting) between the light-shielding layer 320 and the light-transmissive member 200, significantly improving the peeling strength of the light-shielding layer 320.

[0045] Of course, in addition to the above structure formed on the surface of the light-transmissive member 200, the micro-structure part 321 may further include an adhesion-enhancing coating, which may be a polymer coating containing special functional groups to chemically react with the material of the light-shielding layer 320 or form a stronger physical adsorption effect, significantly enhancing the bonding strength between the micro-structure part 321 and the light-shielding layer 320, further reducing the risk of deformation or detachment of the light-shielding layer 320 in the non-display area, thereby improving the product yield and reliability of the display module.

[0046] In summary, the display module provided by the embodiment of the present application, by providing a transparent layer 310 located in the display area and a light-shielding layer 320 located in the non-display area between the display panel 100 and the light-transmissive member 200, avoids the problem of OCA optical glue fitting bubbles caused by ink step difference in the traditional technology; and by providing a micro-structure part 321 on the light-transmissive member 200 in the non-display area, using the micro-structure part 321 to increase the contact area with the light-shielding layer 320 to achieve tight bonding with the light-shielding layer 320. This setting can effectively solve the stability problem of the light-shielding layer 320 in the non-display area, greatly reducing the risk of deformation or detachment of the light-shielding layer 320, improving the product yield during the manufacturing process, reducing production costs and improving production efficiency. Overall, each component system in the display module works, enabling the display module to maintain stable performance in the face of environmental factors such as external force impact, temperature change, and humidity influence, enhancing the reliability and durability of the display module.

[0047] Next, the specific structure of the display module provided by the embodiment of the present application will be introduced in conjunction with the attached Figure 1 - attached Figure 3 The specific structure of the display module provided by the embodiment of the present application will be introduced.

[0048] As Figure 2 and Figure 3 shown, in some embodiments, the micro-structure part 321 includes at least one groove, and the groove is opened on the surface of the light-transmissive member 200 facing the display panel 100.

[0049] It can be understood that the micro-structure part 321 is a physical recessed structure formed on the surface of the light-transmitting member 200 facing the display panel 100, which is used for mechanically fixing the light-shielding layer 320. The plurality of grooves are only distributed on the inner surface of the non-display area of the light-transmitting member 200 and are in direct contact with the light-shielding layer 320. The opening direction of the grooves can be perpendicular to the plane of the light-transmitting member 200, and the depth direction is consistent with the stacking direction.

[0050] Regarding the formation of the grooves on the light-transmitting member 200, it can be through pulsed processing such as ultraviolet laser, or by selectively etching and peeling the light-transmitting member 200 using hydrofluoric acid. The specific formation method is not limited herein.

[0051] In this embodiment, the setting of the grooves can greatly improve the adhesion strength of the light-shielding layer 320 and effectively reduce the defective rate of bubbles.

[0052] In some embodiments, along the stacking direction of the display panel 100 and the light-transmitting member 200, the orthographic projection of the grooves is annular. Specifically, when observed from the stacking direction of the display panel 100 and the light-transmitting member 200, the projection of the grooves on the plane presents an annular shape. This design is beneficial for continuous bonding enhancement around the non-display area. In one example, the depth of the grooves is between 50μm - 150μm; specifically, the depth of the grooves can be 50μm, 70μm, 90μm, 120μm, 150μm, etc. The depth of the grooves refers to the distance from the surface of the light-transmitting member 200 to the bottom of the grooves. Of course, the depth of the grooves should not be too large or too small, and it is appropriate to ensure the bonding effect without affecting the overall performance of the light-transmitting member 200.

[0053] In one example, the width of the grooves is between 20μm - 100μm. Specifically, the width of the grooves refers to the dimension of the grooves in the direction perpendicular to their extension direction, and can be 20μm, 40μm, 60μm, 80μm, 100μm, etc. The setting of the width of the grooves can also effectively control the contact area and bonding strength with the light-shielding layer 320.

[0054] In this embodiment, the annular grooves surround the surface of the non-display area of the light-transmitting member 200, and a part of the light-shielding layer 320 is filled in the annular grooves, forming a continuous bonding structure around the non-display area. The setting of the annular grooves can provide a continuous bonding area to ensure the stability of the light-shielding layer 320 in the entire non-display area and reduce the risk of light leakage. In addition, the appropriate depth and width range can ensure an appropriate contact area and bonding strength with the light-shielding layer 320.

[0055] In some embodiments, the micro-structure part 321 includes a frosted surface; the roughness of the frosted surface is the same, or the roughness of the frosted surface gradually increases in the direction away from the display area.

[0056] It can be understood that the frosted surface refers to the surface of the non-display area of the light-transmitting member 200 that has been specially treated to form a surface with a certain roughness. As another form of the micro-structural part 321, it is used to improve the adhesion to the light-shielding layer 320. Specifically, roughness, as an index to measure the microscopic unevenness of the frosted surface, the same roughness indicates that the microscopic undulation degree of the entire frosted surface is consistent; the roughness gradually increases in the direction away from the display area, indicating that from the direction close to the display area to the direction away from the display area, the microscopic undulation degree of the frosted surface gradually increases.

[0057] Regarding the formation of the frosted surface, the frosted surface can be obtained through different processes such as sandblasting, chemical etching, and laser etching.

[0058] Before coating the above-mentioned light-shielding layer 320 on the frosted surface, a bonding promoter can also be coated on the frosted surface to chemically react with the frosted surface and the material of the light-shielding layer 320, further enhancing the bonding strength between the two.

[0059] In this example, the roughness of the friction surface increases the frictional force and the actual contact area with the light-shielding layer 320, enabling the light-shielding layer 320 to adhere more firmly to the light-transmitting member 200 and improving product stability. In addition, the frosted surface with the same roughness is suitable for scenarios with high requirements for bonding uniformity, while the design with the roughness gradually increasing in the direction away from the display area can ensure better optical performance in the part close to the display area and enhance the bonding to the light-shielding layer 320 in the part away from the display area to meet the functional requirements of different positions.

[0060] Of course, in this embodiment, the combination of the groove and the frosted surface in the above embodiment can also be adopted. Specifically, in some areas, the frosted surface is used, and in some areas, grooves are opened to comprehensively utilize the advantages of the two micro-structures and further optimize the bonding effect with the light-shielding layer 320. For example, the groove structure is adopted in the edge area that is easily subjected to greater external forces, while the frosted surface is adopted in other areas.

[0061] Based on the same application concept, the embodiment of the present application also provides a preparation method for a display module, as Figures 4 to 9 shown, Figure 4 is a schematic flow chart of the preparation method for the display module provided by the embodiment of the present application. Figure 5 is a schematic structural diagram of a display module during the preparation process provided by the embodiment of the present application. This preparation method can be applied to the display module in the above embodiment. This preparation method can include:

[0062] Step S101, providing a light-transmitting member 200 and setting a micro-structural part 321 in the non-display area of the light-transmitting member 200;

[0063] Step S102: Set the first liquid optical glue 330 in the non-display area of the light-transmitting member 200 to bond the first liquid optical glue 330 through the microstructure portion 321, and set the second liquid optical glue 340 in the display area of the light-transmitting member 200. Among them, the first liquid optical glue 330 includes a light-shielding material.

[0064] Step S103: Provide a display panel 100 and bond the display panel 100 to the light-transmitting member 200.

[0065] It can be understood that in step S101, the light-transmitting member 200 is a transparent component disposed on the light-emitting side of the display panel 100, which can be a POL, a Lens, or a cover plate, and is used to protect the display panel 100 and allow light to pass through. The microstructure portion 321, as a specific structure disposed in the non-display area of the light-transmitting member 200, can include forms such as grooves and frosted surfaces, and can be specifically understood with reference to the above embodiments, so as to enhance the bonding effect with the first liquid optical glue 330 (including the light-shielding material) to be set subsequently. Regarding the method of setting the microstructure portion 321, grooves can be formed on the surface of the light-transmitting member 200 through processes such as photolithography and etching, or a frosted surface can be prepared by means such as sandblasting and chemical etching.

[0066] In step S102, the first liquid optical glue 330, as a liquid optical glue containing a light-shielding material, is used to form a light-shielding layer 320 in the non-display area of the light-transmitting member 200, and plays a role in blocking light after curing; and the second liquid optical glue 340, as a transparent liquid optical glue, is used to form a transparent layer 310 in the display area of the light-transmitting member 200, and ensures good light transmission in the display area after curing. Among them, the first liquid optical glue 330 can be an OCR glue added with a light-shielding agent such as black pigment; the second liquid optical glue 340 is a transparent OCR glue. Of course, nano-level light-shielding particles can also be added to the first liquid optical glue 330 to enhance the light-shielding effect; nano-level light-transmitting particles can be added to the second liquid optical glue 340 to further improve the light transmittance of the display area.

[0067] After the microstructure portion 321 in step S101 is formed, a first liquid optical adhesive 330 is coated in the non-display area to bond it to the microstructure portion 321, and a second liquid optical adhesive 340 is coated in the display area. Of course, the second liquid optical adhesive 340 can also be coated in the display area first, and then the first liquid optical adhesive 330 is coated in the non-display area to bond it to the microstructure portion 321. Of course, to prevent the second liquid optical adhesive 340 from having too strong fluidity in the display area, the second liquid optical adhesive 340 can be pre-cured, that is, the second liquid optical adhesive 340 is kept in a jelly state, not easy to flow and suitable for subsequent fitting and extrusion to fill the gap. And since the first liquid optical adhesive 330 plays a role of a fence, the degree of pre-curing needs to be greater than that of the second liquid optical adhesive 340 to avoid deformation and deviation during the fitting and extrusion process.

[0068] In step S103, the display panel 100 is fitted to the light-transmitting member 200 coated with the liquid optical adhesive. At this time, the light-shielding layer 320 formed after the first liquid optical adhesive 330 is cured is located between the non-display areas of the display panel 100 and the light-transmitting member 200, that is, the light-shielding layer 320 in the above-mentioned embodiment is formed, and the transparent layer 310 formed after the second liquid optical adhesive 340 is cured is located between the display areas of the display panel 100 and the light-transmitting member 200, that is, the transparent layer 310 in the above-mentioned embodiment is formed.

[0069] In the embodiment of the present application, by stepwise setting the microstructure portion 321 and the liquid optical adhesives with different functions and then performing fitting, different structures in the display area and non-display area of the display module can be precisely constructed to ensure the normal functions of the display module. In addition, through the bonding design of the microstructure portion 321 and the first liquid optical adhesive 330, the stability of the light-shielding layer 320 in the non-display area is improved, thereby improving the product quality.

[0070] As Figure 5 and Figure 6 shown, Figure 6 FIG. is a schematic structural diagram of another display module provided by the embodiment of the present application during preparation. In some embodiments, step S102 may further include: step S1021, coating a first liquid optical adhesive 330 in the non-display area of the cover plate, and curing the first liquid optical adhesive 330 on the surface of the cover plate through a first curing process to form a dam; step S1022, coating a second liquid optical adhesive 340 in the display area of the cover plate, and leaving a gap 600 between the second liquid optical adhesive 340 and the dam.

[0071] It can be understood that the structure similar to a dam formed by curing the first liquid optical adhesive 330 in the non-display area of the light-transmitting member 200 is used to limit the flow range of the second liquid optical adhesive 340 in the display area, and at the same time enhance the light-shielding and sealing effects in the non-display area. The specific first curing process can adopt ultraviolet curing, thermal curing and other methods.

[0072] In the specific process of this example, a first liquid optical glue 330 is applied to the non-display area of the light-transmitting member 200, and a dam is formed through a first curing process. The dam surrounds the outer periphery of the display area. A second liquid optical glue 340 is applied in the display area, and a certain gap 600 is maintained between the second liquid optical glue 340 and the dam. When the display panel 100 is attached to the light-transmitting member 200, the dam plays a role of blocking and positioning.

[0073] It should be noted that when applying the second liquid optical glue 340 in the display area in this example, a gap 600 needs to be maintained between the second liquid optical glue 340 and the dam. The setting of this gap 600 can effectively prevent glue overflow, and can squeeze and creep the second liquid optical glue 340 to be in close contact with the first liquid optical glue 330 when the display panel 100 and the light-transmitting member 200 are attached. To achieve the above purpose, the above gap 600 needs to be designed. The specific design process is as follows:

[0074] During the attachment process:

[0075] Experimental data shows that the stress-strain of the second liquid optical glue 340 material satisfies the power-law relationship:

[0076] (1)

[0077] Then the deformation amount is:

[0078] (2)

[0079] Among them, h 0 is the initial thickness of the second liquid optical glue material, F is the attachment pressure, K is the strength coefficient (Pa·s n ), and n is the hardening index (n < 1 is softening, n > 1 is hardening).

[0080] During the pressure-holding process after attachment:

[0081] If the pressure F remains constant during the attachment process, the second liquid optical glue material undergoes creep, and the deformation amount increases with time:

[0082] (3)

[0083] Among them, E 0 is the instantaneous elastic modulus, is the Prony series parameter (fitted through creep tests).

[0084] Then, the total deformation amount of the second liquid optical glue is , that is, the sum of formula (2) and formula (3). In this embodiment, the value of the gap 600 can be obtained by calculating the total deformation amount of the second liquid optical glue 340.

[0085] In this embodiment, the setting of the dam can precisely control the distribution of the second liquid optical adhesive 340 in the display area and reduce the amount of overflow adhesive. Additionally, by reasonably designing the gap 600 between the second liquid optical adhesive 340 and the dam, the amount of overflow adhesive can be further reduced.

[0086] In some embodiments, in step S1022, there is further included step S10221 of making the viscosity of the second liquid optical adhesive 340 fall within a preset range through a second curing process, so that the second liquid optical adhesive 340 flows after being pressed.

[0087] Specifically, in combination with the above embodiments, it can be understood that to reduce the fluidity of the second liquid optical adhesive 340 before lamination, its viscosity is increased through a second pasting process to achieve a state where it does not flow easily before lamination and flows under extrusion during the lamination process to fill the gap 600. In one example, step S103 may include step S1031 of extruding the display panel 100 and the light-transmitting member 200, so that the second liquid optical adhesive 340 flows after being pressed to fill the gap 600.

[0088] The specific process is as follows: First, the viscosity of the second liquid optical adhesive 340 is adjusted through a second curing process to make it fall within a preset range. Then, the display panel 100 and the light-transmitting member 200 are extruded. At this time, the second liquid optical adhesive 340 flows under pressure to fill the gap 600 between it and the dam, achieving a tight lamination. Of course, during this process, light pressure can be applied first to make the second liquid optical adhesive 340 flow preliminarily to discharge some bubbles, and then heavy pressure can be applied to complete the final lamination.

[0089] In this example, by controlling the viscosity of the second liquid optical adhesive 340 and using the method of extruding and flowing to fill the gap 600, the lamination in the display area can be made tighter and more uniform, reducing bubbles and gaps and improving the display effect. Additionally, according to different liquid optical adhesives and display module structures, the second curing process and extrusion parameters are flexibly adjusted to meet various production requirements.

[0090] As Figure 7 shown, Figure 7 is a cross-sectional schematic diagram of a dam during the preparation process provided by an embodiment of the present application. In some embodiments, the dam includes at least two layers of the first liquid optical adhesive 330. In step S1021, there is further included: step S10211 of disposing a layer of the first liquid optical adhesive 330 in the non-display area of the light-transmitting member 200 and curing the first liquid optical adhesive 330 through a first curing process to form a shielding layer; step S10212 of disposing a layer of the first liquid optical adhesive 330 on the shielding layer and curing the first liquid optical adhesive 330 through a first curing process to form a shielding layer, and forming a dam by stacking two shielding layers, so that one side of the dam facing the display area has a preset angle.

[0091] It is understandable that a first liquid optical glue 330 is first provided on the non-display area of the light-transmitting member 200 and cured to form an occlusion layer, and then another layer of the first liquid optical glue 330 is provided on the occlusion layer and cured to form another occlusion layer. The two occlusion layers are stacked to form a dam. The dam surrounds the display area and is adjacent to the second liquid optical glue 340 in the display area. In other words, the dam in this example is formed by stacking multiple occlusion layers. This kind of setting can adjust the inclination angle of the side of the dam facing the display area so that the inclination angle is close to 90°, as Figure 7 shown, which facilitates the second liquid optical glue 340 flowing to this place to be in close contact with the side surface of the dam, is beneficial to filling the gap 600 between the two, and improves the bonding quality.

[0092] In addition, the dam structure formed by stacking multiple occlusion layers in this example has higher structural strength, can better withstand the pressure and external force during the bonding process, and reduces the risk of deformation or rupture of the dam. In this example, the coating method of the first liquid optical glue 330 can be spraying, printing, dispensing, etc., but no specific limitation is made.

[0093] As Figure 8 shown, Figure 8 is a schematic cross-sectional view of another dam during preparation provided by an embodiment of the present application. In some embodiments, each occlusion layer includes at least two circles of the first liquid optical glue 330. Step S10212 may further include step S102121 of providing a circle of the first liquid optical glue 330 on one side of the non-display area of the light-transmitting member 200 close to or far from the display area, and curing the first liquid optical glue 330 through a first curing process; step S102122 of providing a circle of the first liquid optical glue 330 on the other side of the non-display area of the light-transmitting member 200 close to or far from the display area, and curing the first liquid optical glue 330 through the first curing process to form an occlusion layer.

[0094] It is understandable that based on the above embodiments, to further optimize the inclination angle of the dam facing the display area, it is achieved by providing at least two circles of the first liquid optical glue 330 in each occlusion layer. Specifically, a circle of the first liquid optical glue 330 is first provided on one side of the non-display area of the light-transmitting member 200 close to or far from the display area and cured, and then another circle of the first liquid optical glue 330 is provided on the other side and cured to form an occlusion layer. Two such occlusion layers are stacked to form a dam. The dam surrounds the display area and cooperates with the second liquid optical glue 340 in the display area.

[0095] It should be noted that the two circles of the first liquid optical glue 330 can be coated adjacent to each other or partially overlapped. The cross-section of the occlusion layer formed by partial overlap is closer to a rectangle.

[0096] In this embodiment, by separately providing the first liquid optical glue rings on different sides to form a shielding layer, a dam structure can be constructed more flexibly, improving the adaptability of the dam. In addition, the shielding layer formed by multiple rings of the first liquid optical glue 330 has better integrity and stability compared with a single glue line, can better shape the structure of the dam, and improve the filling rate of the second liquid optical glue 340.

[0097] As Figure 5 and Figure 6 shown, in some embodiments, before the display panel 100 and the light-transmitting member 200 are bonded; the thickness of the second liquid optical glue 340 is equal to the thickness of the first liquid optical glue 330; or, the thickness of the second liquid optical glue 340 is greater than the thickness of the first liquid optical glue 330, and the thickness difference d between the second liquid optical glue 340 and the first liquid optical glue 330 is between 0.1 μm and 30 μm.

[0098] Specifically, before the display panel 100 and the light-transmitting member 200 are bonded, the thicknesses of the second liquid optical glue 340 and the first liquid optical glue 330 can be designed and adjusted so that their thicknesses are equal or have a specific thickness difference d relationship. During bonding, the thickness difference between the two will affect the distribution of the second liquid optical glue 340 and the effect of the filling gap 600.

[0099] Specifically, the thickness difference d between the second liquid optical glue 340 and the first liquid optical glue 330 can be 0.1 μm, 1 μm, 5 μm, 10 μm, 30 μm, etc., but there is no limitation. Making the thickness of the second liquid optical glue 340 greater than the thickness of the first liquid optical glue 330 can, on the one hand, flow to the dam during extrusion in the bonding process to fill the gap 600, making the lap neater; on the other hand, it can compensate for curing shrinkage.

[0100] In this embodiment, by reasonably controlling the thickness relationship between the second liquid optical glue 340 and the first liquid optical glue 330, the uniform distribution of the liquid optical glue during the bonding process can be ensured, stress concentration can be reduced, and the optical performance of the display module can be optimized at the same time.

[0101] In some embodiments, the curing time of the first curing process is 10 s - 20 s, and the irradiation power is 500 mw / cm 2 .

[0102] Specifically, the curing time of the first curing process can be set according to the properties of the first liquid optical glue 330, and can be 10 s, 15 s, 20 s, etc., but there is no limitation. Since the first liquid optical glue 330 needs to form a dam, its irradiation duration can be increased. Similarly, in one example, the curing time of the second curing process is 5 s - 10 s, and the irradiation power is 500 mw / cm 2; Since the second liquid optical adhesive 340 needs to be in a non-flowing state before lamination and can be in a peristaltic state during lamination, the curing time of the second curing process should not be too long and can be 5 s, 6 s, etc.

[0103] In one example, the gap 600 between the second liquid optical adhesive 340 and the first liquid optical adhesive 330 is between 0.1 μm and 50 μm. Specifically, the gap 600 between the second liquid optical adhesive 340 and the first liquid optical adhesive 330 can be set with reference to the formula in the above embodiment and will not be specifically limited here.

[0104] In one example, the thickness of the dam is between 6 μm and 9 μm. Specifically, the thickness of the dam is designed based on the ability to improve its structural strength and sealing performance and can be 6 μm, 7 μm, 8 μm, 9 μm, etc., and will not be limited here.

[0105] In this embodiment, by clarifying the curing time, irradiation power, gap 600, and dam thickness range of different curing processes, the preparation process of the display module can be precisely controlled to ensure the consistency and stability of product quality. In addition, with appropriate process parameter settings, the dam has good structural strength and sealing performance, and the second liquid optical adhesive 340 can smoothly fill the gap 600, thereby improving the optical performance and reliability of the display module.

[0106] As Figure 9 shown, Figure 9 is a schematic structural diagram of another display module provided by the embodiment of the present application during preparation. In some embodiments, in step S102, step S1023 may further be included, that is, the second liquid optical adhesive 340 is applied to the display area of the light-transmitting member 200 and pre-cured through the second curing process; step S1024, a support film 500 is provided, the support film 500 is disposed on the side of the second liquid optical adhesive 340 away from the light-transmitting member 200, and a part of the support film 500 and the non-display area of the light-transmitting member 200 form a receiving groove 400; step S1025, the first liquid optical adhesive 330 is sprayed into the receiving groove 400 and cured through the first curing process; step S1026, the support film 500 is removed, and the display panel 100 is laminated with the light-transmitting member 200.

[0107] It can be understood that the support film 500 in this example is a thin film temporarily disposed on the side of the second liquid optical adhesive 340 away from the light transmissive member 200, and is used to assist in forming the receiving groove 400 to facilitate spraying the first liquid optical adhesive 330. Specifically, the material of the support film 500 can be a thin film material such as polyethylene terephthalate (PET) or polyethylene (PE) with certain flexibility and strength. The specific process flow is as follows: First, apply the second liquid optical adhesive 340 to the display area of the light transmissive member 200 and pre-cure it. Then, set the support film 500 on the side of the second liquid optical adhesive 340 away from the light transmissive member 200, so that a part of the support film 500 forms the receiving groove 400 with the non-display area of the light transmissive member 200. Spray the first liquid optical adhesive 330 into the receiving groove 400 and cure it. Finally, remove the support film 500 and bond the display panel 100 to the light transmissive member 200. Among them, the pre-curing degree of the second liquid optical adhesive 340 can be set according to the characteristics of the second liquid optical adhesive 340 and the requirements of subsequent processes, and no limitation is made here.

[0108] In this embodiment, by the method of using the support film 500 to assist in forming the receiving groove 400, the process is simpler, easier to operate, and the production efficiency is improved. The receiving groove 400 can more accurately define the position and shape of the first liquid optical adhesive 330, ensuring the quality and stability of the light shielding layer 320 in the non-display area.

[0109] Based on the same inventive concept, the embodiments of the present application also provide a display device. As Figure 1 shown, the display device includes the display module in any of the above embodiments. Exemplarily, the display device includes a display module. Therefore, the display device also has the beneficial effects of the display module in the above embodiments. The same parts can be understood by referring to the explanation of the display module above, and will not be repeated below.

[0110] The display device provided by the embodiments of the present application can be a mobile phone or any electronic product with a display function, including but not limited to the following categories: television, notebook computer, desktop display, tablet computer, digital camera, smart bracelet, smart glasses, in-vehicle display, industrial control equipment, medical display screen, touch interaction terminal, etc. The embodiments of the present application do not make special limitations on this.

[0111] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0112] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A display module, characterized in that: The display module has a display area and a non-display area; The display module comprises: Display panel; A light-transmitting member, arranged on the light-emitting side of the display panel; a bonding layer, located between the display panel and the light-transmitting member, the bonding layer comprising a transparent layer and a light-shielding layer, the transparent layer being located in the display area, and the light-shielding layer being located in the non-display area; Wherein, a microstructure portion is arranged on the light-transmitting member located in the non-display area, and the microstructure portion is used for bonding the light-shielding layer.

2. The display module according to claim 1, characterized in that: The microstructure portion includes at least one groove, and the groove is opened on the surface of the light-transmitting member facing the display panel.

3. The display module according to claim 2, characterized in that: Along the stacking direction of the display panel and the light-transmitting member, the orthographic projection of the groove is annular; And / or, the depth of the groove is between 50 μm and 150 μm; And / or, the width of the groove is between 20 μm and 100 μm.

4. The display module according to claim 1, characterized in that: The microstructure portion includes a frosted surface; The roughness of the frosted surface is the same, or the roughness of the frosted surface gradually increases in a direction away from the display area.

5. A method for preparing a display module, characterized in that: The display module according to any one of claims 1 to 4; the preparation method comprises: Providing a light-transmitting member, and disposing a microstructure portion in a non-display area of ​​the light-transmitting member; A first liquid optical adhesive is arranged in the non-display area of ​​the light-transmitting member, and the first liquid optical adhesive is bonded through the microstructure part, and a second liquid optical adhesive is arranged in the display area of ​​the light-transmitting member; wherein the first liquid optical adhesive includes a light-shielding material; A display panel is provided, and the display panel is laminated to the light-transmitting member.

6. The method for preparing a display module according to claim 5, characterized in that: The step of disposing a first liquid optical adhesive in the non-display area of ​​the light-transmitting member and disposing a second liquid optical adhesive in the display area of ​​the light-transmitting member comprises: Applying the first liquid optical adhesive on the non-display area of ​​the light-transmitting member, and curing the first liquid optical adhesive on the surface of the cover plate through a first curing process to form a dam; The second liquid optical adhesive is coated in the display area of ​​the cover plate, and a gap is provided between the second liquid optical adhesive and the dam.

7. The method for preparing a display module according to claim 6, characterized in that: The step of applying the second liquid optical adhesive in the display area of ​​the cover plate and providing a gap between the second liquid optical adhesive and the dam comprises: The viscosity of the second liquid optical adhesive is made within a preset range by a second curing process, so that the second liquid optical adhesive flows under pressure; The step of bonding the display panel to the light-transmitting member comprises: The display panel and the light-transmitting member are squeezed to make the second liquid optical adhesive flow under pressure to fill the gap.

8. The method for preparing a display module according to claim 6, characterized in that: The dam comprises at least two layers of the first liquid optical adhesive; The step of applying the first liquid optical adhesive on the non-display area of ​​the light-transmitting member and curing the first liquid optical adhesive on the surface of the light-transmitting member through a first curing process to form a dam comprises: Disposing a layer of the first liquid optical adhesive in the non-display area of ​​the light-transmitting member, and curing the first liquid optical adhesive through the first curing process to form a shielding layer; A layer of the first liquid optical adhesive is disposed on the shielding layer, and the first liquid optical adhesive is cured through the first curing process to form a shielding layer, and the dam is formed by stacking two layers of the shielding layers so that the dam has a preset angle toward the display area.

9. The method for preparing a display module according to claim 8, characterized in that: Each of the shielding layers includes at least two circles of the first liquid optical glue; The step of forming the dam by stacking two layers of the shielding layers comprises: Disposing a circle of first liquid optical adhesive in the non-display area of ​​the light-transmitting member on a side close to the display area or away from the display area, and curing the first liquid optical adhesive through the first curing process; A circle of first liquid optical adhesive is arranged in the non-display area of ​​the light-transmitting member close to the display area or on the other side away from the display area, and the first liquid optical adhesive is cured by the first curing process to form the shielding layer.

10. The method for preparing a display module according to any one of claims 5 to 9, characterized in that: Before the display panel and the light-transmitting member are attached to each other; The thickness of the second liquid optical adhesive is equal to the thickness of the first liquid optical adhesive; or, the thickness of the second liquid optical adhesive is greater than the thickness of the first liquid optical adhesive, and the difference in thickness between the second liquid optical adhesive and the first liquid optical adhesive is between 0.1 μm and 30 μm.

11. The method for preparing a display module according to any one of claims 7 to 9, characterized in that: The curing time of the first curing process is 10s-20s, and the irradiation power is 500 mw / cm 2 ; And / or, the curing time of the second curing process is 5s-10s, and the irradiation power is 500 mw / cm 2 ; And / or, the gap between the second liquid optical adhesive and the first liquid optical adhesive is between 0.1 μm and 50 μm; And / or, the thickness of the dam is between 6 μm and 9 μm.

12. The method for preparing a display module according to claim 5, characterized in that: The step of disposing a first liquid optical adhesive in the non-display area of ​​the light-transmitting member and disposing a second liquid optical adhesive in the display area of ​​the light-transmitting member comprises: Applying the second liquid optical adhesive on the display area of ​​the light-transmitting member, and pre-curing the second liquid optical adhesive through a second curing process; Providing a supporting film, disposing the supporting film on a side of the second liquid optical adhesive away from the light-transmitting member, and forming a receiving groove with a portion of the supporting film and a non-display area of ​​the light-transmitting member; Spraying the first liquid optical adhesive into the containing tank, and curing the first liquid optical adhesive through a first curing process; The supporting film is removed, and the display panel is bonded to the light-transmitting member.

13. A display device, characterized in that: A display module comprising any one of claims 1 to 4.

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