CN112614425A - Display module, preparation method thereof and wearable device - Google Patents
Display module, preparation method thereof and wearable device Download PDFInfo
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Images
Classifications
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- G—PHYSICS
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
Abstract
The application relates to a display module, a preparation method thereof and a wearable device, wherein the display module comprises two substrates and a composite film layer positioned between the two substrates, the composite film layer is arranged in a retracted manner, and a gap is formed between the composite film layer and the two substrates; the display module is provided with a glue sealing part in the gap to match with the two substrates to jointly seal the composite film layer. According to the display module, the matched glue sealing part is arranged in the composite film layer in a retracted mode, so that on one hand, the position of the composite film layer is changed, the composite film layer is protected, and the composite film layer is not directly exposed to the external environment; on the other hand, the composite film layer is beneficial to sealing, and the phenomenon that the product fails or the display effect is influenced because water vapor or sebum enters the display module is prevented; on the other hand, the glue sealing part is matched with the two substrates to jointly seal the composite film layer, so that the technology is easy to realize and excessive cost is not increased; in yet another aspect, the usage status of the glue seal is predictable, which facilitates normal use of the display module during the maintenance period and scheduled maintenance.
Description
Technical Field
The application relates to the field of display, in particular to a display module, a preparation method thereof and a wearable device.
Background
The display module of the wearable device comprises a composite film layer and two substrates clamping the composite film layer, wherein the composite film layer consists of a plurality of layers of functional films, and other display structures can exist between the two substrates and the composite film layer. As shown in fig. 1, in a conventional display module 100, two substrates include a first substrate 101 and a second substrate 102, and a composite film 110 is disposed between the first substrate 101 and the second substrate 102. As shown in fig. 2, the composite film layer 110 includes a first film layer 111, a second film layer 112, a third film layer 113, a fourth film layer 114, and a fifth film layer 115, which are sequentially stacked. The first film layer 111, the second film layer 112, the third film layer 113, the fourth film layer 114 and the fifth film layer 115 are arranged in the same or different manner, and are used for realizing the overall display effect in a matching manner.
However, the display device of the wearable device is different from the common display device in protection, the display device of the wearable device faces a severe environment when in use, sweat soaking is a very common phenomenon, and grease, tear water, rainwater, sunlight and the like exist in addition, so that the product fails or the display effect is influenced, namely, the service life of the display device or the composite film layer thereof is obviously shortened, and the design life cannot be reached.
In addition, since the wearable device itself is required to be light and small, the composite film layer cannot be protected by adding a housing or the like.
Disclosure of Invention
Accordingly, there is a need for a display module, a method for manufacturing the same, and a wearable device.
A display module comprises two substrates and a composite film layer positioned between the two substrates, wherein the composite film layer is arranged in a retracted mode, and a gap is formed between the composite film layer and the two substrates; the display module is provided with a glue sealing part in the gap to cooperate with the two substrates to jointly seal the composite film layer.
According to the display module, the matched glue sealing part is arranged in the composite film layer in a retracted mode, so that on one hand, the position of the composite film layer is changed, the composite film layer is protected, and the composite film layer is not directly exposed to the external environment; on the other hand, the composite film layer is beneficial to sealing, and the phenomenon that the product fails or the display effect is influenced because water vapor or sebum enters the display module is prevented; on the other hand, the glue sealing part is matched with the two substrates to jointly seal the composite film layer, so that the technology is easy to realize and excessive cost is not increased; in yet another aspect, the usage status of the glue seal is predictable, which facilitates normal use of the display module during the maintenance period and scheduled maintenance.
In one embodiment, the two substrates include a first substrate and a second substrate, the first substrate has a first end angle, the second substrate has a second end angle, a substrate difference surface is formed between the first end angle and the second end angle, and a surface of the glue sealing portion is flush with the substrate difference surface or the surface of the glue sealing portion is recessed relative to the substrate difference surface.
In one embodiment, the composite film layer is configured to retract between 150 microns and 250 microns.
In one embodiment, two gaps are formed between two sides of the composite film and the two substrates, respectively, and the display module is provided with one sealant at each gap to cooperate with the two substrates to seal the composite film together.
In one embodiment, the sealing portion is formed by dispensing in a dispensing direction perpendicular to the different surface of the substrate.
In one embodiment, the dispensing direction is located at a middle position of the substrate difference surface.
In one embodiment, the sealing part is formed by ultraviolet curing of ultraviolet curing gap filling glue.
In one embodiment, the glue seal has a fluorine-containing polyurethane-acrylic oligomer.
In one embodiment, a method for manufacturing a display module includes the steps of:
forming a composite film layer which is arranged oppositely to the two substrates in a retracted mode, and forming a gap between the composite film layer and the two substrates, wherein the two substrates comprise a first substrate and a second substrate;
forming a substrate difference surface between the first end angle of the first substrate and the second end angle of the second substrate, and performing glue dispensing operation on the gap in a glue dispensing direction perpendicular to the substrate difference surface;
and forming a glue sealing part in an ultraviolet curing mode, wherein the glue sealing part is matched with the two substrates to jointly seal the composite film layer.
In one embodiment, the surface of the glue seal is flush with the substrate difference surface or the surface of the glue seal is recessed relative to the substrate difference surface; or the dispensing direction is positioned in the middle of the different surface of the substrate; or the glue seal part is provided with fluorine-containing polyurethane-acrylic oligomer; or the composite film layer is retracted by 150 to 250 micrometers relative to the two substrates; or two gaps are formed between the two sides of the composite film layer and the two substrates respectively, and a glue sealing part is formed at each gap to cooperate with the two substrates to seal the composite film layer together.
In one embodiment, the dispensing operation includes:
performing linear scanning in a three-dimensional recognition mode, determining the different surfaces of the substrate and taking the different surfaces of the substrate as dispensing surfaces;
adjusting the machine table to enable the dispensing needle head to be perpendicular to the dispensing surface;
scanning and determining the dispensing depth and width of each position of the gap by using a contourgraph;
dispensing is carried out in a frequency conversion dispensing mode, and the edge of the glue sealing part is ensured to be flush with the first end angle of the first substrate and the second end angle of the second substrate.
In one embodiment, the wearable device comprises a wearable structure and a display module connected to the wearable structure, wherein the display module comprises two substrates and a composite film layer positioned between the two substrates;
the composite film layer is arranged in a retracted mode, and a gap is formed between the composite film layer and the two substrates;
the display module is provided with a glue sealing part in the gap to cooperate with the two substrates to jointly seal the composite film layer.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a conventional display module.
Fig. 2 is a partially detailed schematic view of the conventional display module shown in fig. 1.
Fig. 3 is a schematic structural diagram of an embodiment of a display module according to the present application.
Fig. 4 is a partial detailed view of the display module shown in fig. 3 after the adhesive sealing portion is removed.
Fig. 5 is a schematic view illustrating a dispensing method of another embodiment of a display module of the present application.
Fig. 6 is a schematic diagram of a problem that may occur with the embodiment shown in fig. 5.
Fig. 7 is a schematic diagram of another problem that may occur with the embodiment shown in fig. 6.
Fig. 8 is a schematic diagram of another problem that may occur with the embodiment shown in fig. 5.
Fig. 9 is a schematic view illustrating a dispensing method of another embodiment of a display module of the present application.
Fig. 10 is another schematic view of the embodiment shown in fig. 9.
Fig. 11 is a schematic view illustrating a dispensing method of another embodiment of a display module of the present application.
Fig. 12 is a schematic view of a water drop angle test of another embodiment of a display module of the present application.
Fig. 13 is a schematic view of a drop angle test of another embodiment of a display module of the present application.
Fig. 14 is a partial structural schematic view of an embodiment of a display module without a glue seal according to the present application.
Fig. 15 is a partial schematic structural view of an embodiment of a display module of the present application having a flat adhesive sealing portion.
Fig. 16 is a partial structural schematic view of an embodiment of a display module of the present application having an inner shrink sealing portion.
Fig. 17 is a diagram illustrating the shape of the dispensed dots and the reliability test result of the embodiment shown in fig. 14.
Fig. 18 is a schematic diagram illustrating the shape of the dispensed paste and the reliability test result of the embodiment shown in fig. 15.
Fig. 19 is a diagram illustrating the shape of the dispensed dots and the reliability test result of the embodiment shown in fig. 16.
Fig. 20 is a schematic flowchart of an embodiment of a method for manufacturing a display module according to the present application.
Fig. 21 is a schematic structural diagram of an embodiment of a wearable device according to the present application.
Reference numerals:
a display module 100, a wearing structure 200;
a first substrate 101, a second substrate 102, a composite film layer 110, and a glue sealing part 120;
a first film layer 111, a second film layer 112, a third film layer 113, a fourth film layer 114, a fifth film layer 115, a film layer surface 116, and a gap 121;
a first end angle 103, a second end angle 104, a dispensing direction 201, a substrate difference surface 202, a glue overflow part 203, a dispensing needle 204, a central line 205, a height difference 206, a defect position 207 and a defect area 300;
gap width L1, height difference value L2.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used in the description of the present application are for illustrative purposes only and do not represent the only embodiments.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact via an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "on," "over," and "above" a second feature may be directly or obliquely below the second feature, or simply mean that the first feature is at a lesser elevation than the second feature.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the description of the present application, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In one embodiment of the present application, a display module includes two substrates and a composite film layer located between the two substrates, wherein the composite film layer is disposed in a retracted manner and a gap is formed between the composite film layer and the two substrates; the display module is provided with a glue sealing part in the gap to cooperate with the two substrates to jointly seal the composite film layer. According to the display module, the matched glue sealing part is arranged in the composite film layer in a retracted mode, so that on one hand, the position of the composite film layer is changed, the composite film layer is protected, and the composite film layer is not directly exposed to the external environment; on the other hand, the composite film layer is beneficial to sealing, and the phenomenon that the product fails or the display effect is influenced because water vapor or sebum enters the display module is prevented; on the other hand, the glue sealing part is matched with the two substrates to jointly seal the composite film layer, so that the technology is easy to realize and excessive cost is not increased; in yet another aspect, the usage status of the glue seal is predictable, which facilitates normal use of the display module during the maintenance period and scheduled maintenance. In one embodiment, as shown in fig. 3, the display module 100 includes a first substrate 101, a second substrate 102, and a composite film 110 disposed between the first substrate 101 and the second substrate 102, referring to fig. 4, the composite film 110 includes a first film 111, a second film 112, a third film 113, a fourth film 114, and a fifth film 115 sequentially stacked, the composite film 110 is retracted and a gap 121 is formed between the composite film 110 and the two substrates; the display module 100 is provided with a sealant 120 in the gap 121 to cooperate with the first substrate 101 and the second substrate 102 to seal the composite film 110. In this embodiment, two gaps 121 are respectively formed between two sides of the composite film layer 110 and the two substrates, and the display module is provided with one adhesive sealing portion 120 in each gap 121 to cooperate with the two substrates to jointly seal the composite film layer 110.
In one embodiment, a display module includes a part of or the entire structure of the following embodiments; that is, the display module includes some or all of the following technical features. Further, in one embodiment, the sealant is filled in the gap to cover the edge of the composite film layer, and the two substrates are matched to seal the composite film layer together. In order to improve the sealing effect and avoid the failure of the joint, further, in one embodiment, the glue sealing portion forms two layers of glue sealing bodies at the position where the glue sealing portion contacts with the substrate, that is, the glue sealing portion is formed twice, and the second time covers the position where the glue sealing portion after the first glue dispensing and curing contacts with the substrate. It is understood that, in various embodiments, the sealing of the composite film layer seals the edges of the composite film layer from the external environment, and prevents moisture or sebum from entering the composite film layer or entering the display module through the composite film layer. In one embodiment, as shown in fig. 4, the width of the gap 121, i.e., the gap width L1, is 150 microns to 250 microns, i.e., the composite film layer 110 is disposed to be retracted by 150 microns to 250 microns. Further, in one embodiment, the slit width L1 is 180 micrometers, 200 micrometers, or 220 micrometers, etc., i.e., the composite film layer 110 is set to be retracted by 180 micrometers, 200 micrometers, or 220 micrometers, etc. The rest of the embodiments are analogized and are not described in detail. The design is favorable for protecting the composite film layer, so that the laminated combination part at the edge of the composite film layer is not directly exposed to the external environment, water vapor or sebum and the like are prevented from entering, and the service life of the display module is effectively ensured; particularly for a display device of a wearable device.
It will be appreciated that due to the precision of the manufacturing and assembly processes, and the microscopic presentation at different magnifications, the corners of the two substrates must not be perfectly aligned, and that height and angle differences must be present, in one embodiment, the two substrates include a first substrate and a second substrate, the first substrate has a first end corner, the second substrate has a second end angle, a substrate difference surface is formed between the first end angle and the second end angle, in one embodiment, the two substrates include a first substrate and a second substrate, the first substrate has a first end corner, the second substrate has a second end angle, a substrate difference surface is formed between the first end angle and the second end angle, the surface of the glue sealing part is flush with the different surface of the substrate or the surface of the glue sealing part is retracted relative to the different surface of the substrate. As shown in fig. 5, the two substrates include a first substrate 101 and a second substrate 102, a gap 121 is formed between the first substrate 101 and the second substrate 102, the first substrate 101 has a first end corner 103, the second substrate 102 has a second end corner 104, a substrate difference surface 202 is formed between the first end corner 103 and the second end corner 104, and a sealant is injection-molded from a middle position of the substrate difference surface 202 in a dispensing direction 201. In this embodiment, the height of the first substrate 101 is lower than that of the second substrate 102 relative to the film surface 116 on the side of the composite film 110, that is, the height of the first end corner 103 relative to the film surface 116 is lower than that of the second end corner 104 relative to the film surface 116, and the angle of the first end corner 103 relative to the film surface 116 is different from that of the second end corner 104 relative to the film surface 116, so that the substrate difference plane 202 in the embodiment shown in fig. 5 is in a left-lower-right height shape. In one embodiment, the dispensing direction is located at a middle position of the substrate difference surface. It is understood that the film surface 116 is also uneven at some microscopic level, but has a different level of flatness relative to the substrate differential surface 202; although the substrate difference plane 202 is shown as a dotted line in fig. 5, it is actually a plane, and the dispensing direction 201 corresponds to a line located in the middle of the plane. In one embodiment, the dispensing direction 201 is perpendicular to the film surface 116 of the edge of the composite film 110.
As mentioned above, based on almost unavoidable technical factors, as shown in fig. 5, the probability that the substrate difference surface 202 is parallel to the film surface 116 is very low, and in a normal situation, when glue is injected along the dispensing direction 201 to form a glue sealing portion, as shown in fig. 6, the glue is easy to overflow to form a glue overflow portion 203; or as shown in fig. 7, not only the glue overflow portion 203 is formed by overflow, but also a defect position 207 may be formed; alternatively, as shown in fig. 8, the glue overflow portion 203 is formed at the edge of the first substrate 101. It is worth noting that for wearable devices that seek to be lightweight, compact and comfortable to wear, glue spillage is unacceptable. In order to solve the above problem, and considering the gravity effect during dispensing, in one embodiment, as shown in fig. 9, the dispensing direction 201 is located at the middle position of the substrate difference surface 202, i.e. at the position of the middle line, which forms a line, and for the regular substrate difference surface, the position forms a straight line. Referring to fig. 10, the dispensing direction 201 is perpendicular to the substrate difference plane 202; that is, the sealant 120 is formed by dispensing in a dispensing direction 201 perpendicular to the substrate difference surface 202. Further, in one embodiment, when the dispensing method is used, the display module is disposed obliquely, that is, the two substrates and the composite film layer between the two substrates are disposed obliquely, so that the substrate difference surface 202 is parallel to the horizontal direction. By the design, the mode of forming the glue sealing part by dispensing is optimized, the uniform dispensing effect relative to the difference surface of the substrate on the microscopic surface is favorably obtained, and the composite film layer is favorably sealed; on the other hand, the method is beneficial to avoiding glue overflow, and no extra glue overflow elimination treatment is needed after the glue sealing related process is finished, so that the manufacturing efficiency of the display module is improved; on the other hand, the protective effect on the substrate in the dispensing process is facilitated, the glue sealing part is matched with the two substrates to jointly seal the composite film layer, and the realization cost is low.
In order to solve the problem of uniform glue entering from the gap and avoid the situation that the glue outlet of the glue dispensing needle is too high to drop on the substrate or even outside, in one embodiment, after the display module is obliquely arranged, one substrate is higher than the other substrate and has a height difference value, that is, the highest position of one substrate is higher than the highest position of the other substrate by the height difference value, the highest position of the other substrate is usually the end angle position of the substrate, for example, the first end angle 103 or the second end angle 104, and in the glue dispensing mode, the glue outlet height from the substrate difference surface is smaller than or equal to the height difference value. As shown in fig. 10 and 11, the distance between the glue outlet of the dispensing needle 204 and the substrate difference surface is the glue outlet height, which is less than or equal to the height difference L2 of the height difference 206. The center line of the dispensing needle 204 coincides with the dispensing direction 201. Such a design is favorable for matching with the embodiment that the display module is obliquely arranged in a dispensing mode, further optimizes the dispensing effect that the gap is uniformly filled with glue, and reduces the possibility that glue solution drops on the substrate or even the outside in the dispensing process.
In order to facilitate the dispensing operation and the molding sealing, in one embodiment, the sealant is formed by Ultraviolet (UV) curing using an Ultraviolet curing gap filling adhesive. The ultraviolet curing mode is favorable for dispensing by adopting liquid glue solution, so that the liquid glue solution is uniformly distributed in the gap, and a better effect of sealing the composite film layer is obtained after curing. In one embodiment, the surface of the adhesive sealing part is flush with the differential surface of the substrate, that is, the adhesive sealing part fills the gap; or the surface of the glue sealing part is retracted relative to the different surface of the substrate, namely the glue sealing part only fills the gap. In one embodiment, the glue seal has a fluorine-containing polyurethane-acrylic oligomer. Namely, the glue solution adopted by the glue dispensing mode is provided with fluorine-containing polyurethane-acrylic acid oligomer. Further, in one embodiment, the adhesive seal further has a uv initiator or the like. By adopting the design, compared with a substrate such as a plastic base material, the functional composite film layer is arranged in a retracted manner, for example, the retracted manner is about 200 μm, the fluorine-containing ultraviolet gap filling glue is filled into a gap between the base material and the multilayer film in a dispensing manner, and then the ultraviolet gap filling glue is cured, so that the effect of preventing moisture or sebum in daily life from entering the display module is achieved, and the display effect is not influenced. It can be understood that, in order to ensure the protection effect of the ultraviolet gap-filling adhesive on the multilayer film structure, the selection of the ultraviolet gap-filling adhesive material and the dispensing process are very important, the dispensing process is as described above, and the ultraviolet gap-filling adhesive material adopts the adhesive solution containing the fluorinated polyurethane-acrylic oligomer, and the test has the advantage of good adhesion with the base material, and the reliability test proves that no interaction occurs between the ultraviolet gap-filling adhesive material and the composite film layer and the substrate; in the specific application, the ultraviolet joint filling glue material can select fluorinated polyurethane-acrylic acid oligomer to match with different monomers and ultraviolet light initiator, the viscosity is adjusted to be 100 cps-2000 cps so as to be beneficial to a glue dispensing mode or a glue dispensing step, and meanwhile, the fluorinated group-containing glue is more hydrophobic and oleophobic, so that water vapor, sebum sweat and the like are not easy to permeate into the membrane structure.
Further, in order to improve the sealing effect of the glue sealing portion on the composite film layer, in one embodiment, one or two shallow grooves are formed in each substrate at a position adjacent to the gap, and the depth of each shallow groove is 5% to 20% of the thickness of the substrate; the width of the shallow grooves is 10-20 micrometers, when two shallow grooves are arranged, the distance between the shallow grooves is 10-20% of the retraction distance of the composite film layer relative to the two substrates or 20-40 micrometers, and the distance between the shallow grooves close to the surface of the composite film layer and the surface of the film layer is 25-40 micrometers; when only one shallow groove is formed, the distance between the shallow groove and the surface of the film layer is 25-40 microns. Further, in one embodiment, the depth of the shallow groove is 10 to 30 micrometers of the thickness of the substrate; the width of the shallow grooves is 10 to 20 microns. Further, in one embodiment, the shallow grooves are serrated with respect to the surface of the slot. In order to avoid that the touch structure of the display module is close to the external environment due to the relative retraction of the composite film layer, further, in one embodiment, when there are two shallow grooves, silver microspheres or silver wires are filled in the shallow grooves on the surface of the film layer close to the composite film layer; when only one shallow groove is filled with silver microspheres or silver wires, the silver microspheres or silver wires are favorable for capturing sulfur elements in the gaseous sulfur-containing substances and forming a certain antibacterial effect on the wearable device. Such design has the disadvantage that increases public technology complexity, needs additionally to do shallow cutting operation to the base plate, but then has great promotion to the sealing performance of compound rete, is particularly suitable for the wearable device that is often in the dynamic moist environment, is favorable to long-term sealed compound rete, prevents that inside product inefficacy or the influence display effect that causes of aqueous vapor or sebum etc. entering display module.
In order to verify the adhesive sealing portion on the composite film layer of the display module, three tests were performed on the adhesive solution used to verify the feasibility.
And 2, coating the film on a flat plate made of the same material as the base plate, ensuring a hundred-grid test after a hot dipping test (65 ℃, 90% HR and 72HRs), namely uniformly marking out squares with a certain specification size, and evaluating the adhesion degree of the film to the base material by evaluating the integrity degree of the film in the squares, wherein the hundred-grid test of the display module can reach 5B, namely the edges of the cuts are completely smooth, and the edges of the squares are not peeled off, so that the display module has better adhesion performance.
Test 3, reliability test, four substances are respectively adopted: chemical cocktail (Chemical cocktail), emulsion (Lotion), Soap (Soap), and Synthetic tears (Synthetic tears) are coated on the glue seal part of the composite film layer after glue dispensing and curing, so as to ensure that the multilayer film does not change due to Chemical permeation or reaction with ultraviolet joint sealant after reliability test (65 ℃, 90% HR, 72HRs, with Chemical). In test 3, the applicant prepared display modules of three structures, as shown in fig. 14, 15 and 16, respectively, wherein fig. 14 shows a display module without a sealant, fig. 15 shows a display module with a planar sealant, and fig. 16 shows a display module with a sealant shrunk inwards to form an arc-shaped surface. In the embodiment shown in fig. 15, the surface of the adhesive sealing portion 120 of the display module is flush with the substrate difference surface 202. In the embodiment shown in fig. 16, the surface of the adhesive sealing portion 120 of the display module is recessed with respect to the substrate difference surface 202.
The dispensing shape and the reliability test result are shown in fig. 17, fig. 18 and fig. 19, respectively, wherein the dispensing shape and the reliability test result of the embodiment shown in fig. 14 are shown in fig. 17, and the display module without the sealant portion has a whitened defect area 300, i.e., it is a defective product, thereby verifying that the display device of the wearable device is prone to display problems when the display device is used in a harsh environment, such as when the display device is soaked by sweat; the embodiment with the glue sealing portion as shown in fig. 18 and 19 has no whitening whether having a flat glue sealing portion or an inwardly shrunk glue sealing portion, and the display module remains intact, i.e. has better reliability.
According to the three tests, the glue sealing part is used as the joint sealant, the multi-layer film structure of the composite film layer can be effectively protected, permeation of chemicals, water vapor, sweat and the like is prevented, and the joint sealant with different shapes is used for protecting the multi-layer film layer from chemical corrosion, so that the design service life of the display device or the composite film layer of the display device is prolonged.
In one embodiment, a method for manufacturing a display module, as shown in fig. 20, includes the steps of: forming a composite film layer which is arranged oppositely to the two substrates in a retracted mode, and forming a gap between the composite film layer and the two substrates, wherein the two substrates comprise a first substrate and a second substrate; forming a substrate difference surface between the first end angle of the first substrate and the second end angle of the second substrate, and performing glue dispensing operation on the gap in a glue dispensing direction perpendicular to the substrate difference surface; and forming a glue sealing part in an ultraviolet curing mode, wherein the glue sealing part is matched with the two substrates to jointly seal the composite film layer. Further, in one embodiment, the method for manufacturing the display module adopts the display module of any embodiment.
In one embodiment, the surface of the glue seal is flush with the substrate difference surface or the surface of the glue seal is recessed relative to the substrate difference surface; or the dispensing direction is positioned in the middle of the different surface of the substrate; or the glue seal part is provided with fluorine-containing polyurethane-acrylic oligomer; or the composite film layer is retracted by 150 to 250 micrometers relative to the two substrates; or two gaps are formed between the two sides of the composite film layer and the two substrates respectively, and a glue sealing part is formed at each gap to cooperate with the two substrates to seal the composite film layer together. In one embodiment, the surface of the glue seal is flush with the substrate difference surface or the surface of the glue seal is recessed relative to the substrate difference surface; the dispensing direction is positioned in the middle of the different surface of the substrate; the glue seal part is provided with fluorine-containing polyurethane-acrylic oligomer; the composite film layer is retracted by 150 to 250 micrometers relative to the two substrates; two gaps are formed between two sides of the composite film layer and the two substrates respectively, and a glue sealing part is formed at each gap to cooperate with the two substrates to seal the composite film layer together. The rest of the embodiments are analogized and are not described in detail.
In order to ensure the accuracy of dispensing, in one embodiment, the dispensing method or the dispensing operation includes: performing linear scanning in a three-dimensional recognition mode, determining the different surfaces of the substrate and taking the different surfaces of the substrate as dispensing surfaces; adjusting the machine table to enable the dispensing needle head to be perpendicular to the dispensing surface; scanning and determining the dispensing depth and width of each position of the gap by using a contourgraph; dispensing is carried out in a frequency conversion dispensing mode, and the edge of the glue sealing part is ensured to be flush with the first end angle of the first substrate and the second end angle of the second substrate. For example, after 3D line scanning during dispensing, the dispensing needle is adjusted by the machine to be perpendicular to the dispensing surface, thereby avoiding the occurrence of glue overflow; then scanning with a profile scanner to obtain the dispensing depth and width at different positions, and ensuring the ultraviolet gap filling glue edge of the finished product to be aligned with the substrate through frequency conversion dispensing.
In one embodiment, as shown in fig. 21, a wearable device comprises a wearable structure 200 and the display module 100 of any embodiment, the display module is connected to the wearable structure to form the wearable device integrally, and the display module comprises two substrates and a composite film layer located between the two substrates; the composite film layer is arranged in a retracted mode, and a gap is formed between the composite film layer and the two substrates; the display module is provided with a glue sealing part in the gap to cooperate with the two substrates to jointly seal the composite film layer. The wearing structure is used for detachably wearing the wearable device on a target position, wherein the target position comprises, but is not limited to, a wrist, a neck, an ankle and the like. The wearable device is provided with the display module in any embodiment and can be also called as an intelligent wearable device or wearable equipment, and the matching glue sealing part is arranged in the composite film layer in a retracted mode, so that on one hand, the position of the composite film layer is changed, the composite film layer is protected, and the composite film layer is not directly exposed to the external environment; on the other hand, the composite film layer is beneficial to sealing, and the phenomenon that the product fails or the display effect is influenced because water vapor or sebum enters the display module is prevented; on the other hand, the glue sealing part is matched with the two substrates to jointly seal the composite film layer, so that the technology is easy to realize and excessive cost is not increased; in yet another aspect, the usage status of the glue seal is predictable, which facilitates normal use of the display module during the maintenance period and scheduled maintenance.
Other embodiments of the present application further include a display module, a manufacturing method thereof, and a wearable device, which are formed by combining technical features of the above embodiments. The display module in each embodiment is applied to a wearable device and can also be called as a display module of the wearable device; alternatively, the display module in each embodiment is applied to a wearable device, and may also be referred to as a display module of the wearable device.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.
Claims (10)
1. A display module comprises two substrates and a composite film layer positioned between the two substrates, and is characterized in that the composite film layer is arranged in a retracted mode, and a gap is formed between the composite film layer and the two substrates;
the display module is provided with a glue sealing part in the gap to cooperate with the two substrates to jointly seal the composite film layer.
2. The display module according to claim 1, wherein the two substrates include a first substrate and a second substrate, the first substrate has a first end corner, the second substrate has a second end corner, a substrate difference surface is formed between the first end corner and the second end corner, and a surface of the sealant is flush with the substrate difference surface or is recessed relative to the substrate difference surface; alternatively, the composite film layer is arranged to retract 150 microns to 250 microns; or two gaps are formed between the two sides of the composite film layer and the two substrates respectively, and the display module is provided with one sealing part in each gap to match the two substrates to seal the composite film layer together.
3. The display module of claim 2, wherein the sealant is formed by dispensing in a dispensing direction perpendicular to the substrate difference plane.
4. The display module of claim 3, wherein the dispensing direction is located at a middle position of the substrate difference surface.
5. The display module according to any one of claims 1 to 4, wherein the sealant is formed by ultraviolet curing using an ultraviolet curing gap filling sealant.
6. The display module of claim 5, wherein the glue seal has a fluorine-containing polyurethane-acrylic oligomer.
7. A method for manufacturing a display module, comprising the steps of:
forming a composite film layer which is arranged oppositely to the two substrates in a retracted mode, and forming a gap between the composite film layer and the two substrates, wherein the two substrates comprise a first substrate and a second substrate;
forming a substrate difference surface between the first end angle of the first substrate and the second end angle of the second substrate, and performing glue dispensing operation on the gap in a glue dispensing direction perpendicular to the substrate difference surface;
and forming a glue sealing part in an ultraviolet curing mode, wherein the glue sealing part is matched with the two substrates to jointly seal the composite film layer.
8. The method for manufacturing a display module according to claim 7, wherein the surface of the adhesive sealing portion is flush with the substrate difference surface or the surface of the adhesive sealing portion is recessed with respect to the substrate difference surface; or the dispensing direction is positioned in the middle of the different surface of the substrate; or the glue seal part is provided with fluorine-containing polyurethane-acrylic oligomer; or the composite film layer is retracted by 150 to 250 micrometers relative to the two substrates; or two gaps are formed between the two sides of the composite film layer and the two substrates respectively, and a glue sealing part is formed at each gap to cooperate with the two substrates to seal the composite film layer together.
9. The method for manufacturing a display module according to claim 8, wherein the dispensing operation comprises:
performing linear scanning in a three-dimensional recognition mode, determining the different surfaces of the substrate and taking the different surfaces of the substrate as dispensing surfaces;
adjusting the machine table to enable the dispensing needle head to be perpendicular to the dispensing surface;
scanning and determining the dispensing depth and width of each position of the gap by using a contourgraph;
dispensing is carried out in a frequency conversion dispensing mode, and the edge of the glue sealing part is ensured to be flush with the first end angle of the first substrate and the second end angle of the second substrate.
10. A wearable device is characterized by comprising a wearable structure and a display module connected with the wearable structure, wherein the display module comprises two substrates and a composite film layer positioned between the two substrates;
the composite film layer is arranged in a retracted mode, and a gap is formed between the composite film layer and the two substrates;
the display module is provided with a glue sealing part in the gap to cooperate with the two substrates to jointly seal the composite film layer.
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Application publication date: 20210406 |