Display screen structure and its attaching process

Abstract

The application relates to the technical field of display screen assembling, in particular to a display screen structure and a laminating process thereof, which comprises the following steps: providing a first substrate and a second substrate; coating an adhesive layer on the first substrate; mounting a frame on the second substrate; laminating the second substrate and the adhesive layer on the first substrate, forming an air layer between the first substrate and the second substrate after the adhesive layer is solidified, and reserving a glue injection opening between the first substrate and the second substrate; and injecting glue into the air layer to completely laminate the first substrate and the second substrate. The application can avoid the problem of uneven glue layer thickness caused by the fact that part of the glue does not flow full and part of the glue has begun to semi-solidify during the glue injection process, thereby avoiding the problems of light leakage, Mura and macula after the display screen is laminated, and the problem of bubbles generated during the glue injection process can also be avoided by arranging an exhaust channel.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display screen assembly, in particular to a display screen structure and a lamination process thereof. BACKGROUND

[0002] With the development of display screen technology, touch screens (TP, Touch Panel) as a simple, convenient and natural human-computer interaction device have been widely used in various fields such as mobile phones, vehicle navigation systems, industrial control, medical treatment, self-service terminals and the like, greatly facilitating users, especially the elderly, and thus bringing a brand-new user experience.

[0003] In the specific assembly application of the touch screen, a liquid crystal screen assembly is usually carried on the back of the touch screen, and the non-display areas of the two are laminated by double-sided adhesive or RTV glue (room temperature vulcanized silicone rubber), so that the air layer formed between the two is filled with liquid optical glue, and the touch screen and the liquid crystal screen assembly are fully laminated by using the liquid optical glue, thereby improving the lamination effect and display effect. However, in the process of injecting glue into the large-size touch screen and the liquid crystal screen assembly, since the glue injection time is long, when the air layer is not full of glue, but the glue has begun to semi-solidify, it is easy to cause uneven thickness of the glue layer, and thus after the touch screen and the liquid crystal screen assembly are laminated, light leakage, Mura (a phenomenon of uneven display brightness, causing various traces) and yellow spots are prone to occur. SUMMARY

[0004] Therefore, it is necessary to provide a display screen structure and a lamination process thereof for solving the problems of light leakage, Mura and yellow spots of the display screen caused by uneven thickness of the glue layer.

[0005] According to one aspect of the present application, a display screen lamination process is provided, comprising the following steps:

[0006] coating an adhesive layer on a first substrate;

[0007] mounting a frame on a second substrate;

[0008] laminating the second substrate and the adhesive layer on the first substrate, so as to form an air layer between the first substrate and the second substrate, and to reserve a glue injection port between the first substrate and the second substrate;

[0009] injecting glue into the air layer through the glue injection port, so as to fully laminate the first substrate and the second substrate.

[0010] In one of the embodiments, before the step of completely adhering the first substrate to the second substrate by injecting glue into the air layer through the glue injection port, the method further comprises the steps of:

[0011] Reserving an exhaust passage between the first substrate and the second substrate.

[0012] In one of the embodiments, the exhaust passage is arranged at the four corners between the first substrate and the second substrate.

[0013] In one of the embodiments, the step of reserving an exhaust passage between the first substrate and the second substrate comprises the steps of:

[0014] Placing an adhesive strip at the four corners between the first substrate and the second substrate;

[0015] Taking out the adhesive strip to form the exhaust passage.

[0016] In one of the embodiments, the edge of the first substrate is provided with an ink layer, and the step of coating adhesive on the first substrate comprises the step of coating the adhesive layer on the middle part of the first substrate, so that there is a gap between the adhesive layer and the ink layer.

[0017] In one of the embodiments, the step of mounting the frame on the second substrate comprises the steps of:

[0018] There is a dispensing gap between the frame and the second substrate, and glue is dispensed in the dispensing gap to adhere the frame to the second substrate.

[0019] In one of the embodiments, before the step of injecting glue into the air layer, the method further comprises the steps of:

[0020] Letting the first substrate and the second substrate stand to cure the adhesive layer;

[0021] And / or, after the step of injecting glue into the air layer, the method further comprises the steps of:

[0022] Letting the first substrate and the second substrate stand to cure the injected glue.

[0023] According to another aspect of the present application, a display screen structure is provided, comprising a first substrate and a second substrate, the first substrate is provided with an adhesive layer, the first substrate is connected to the second substrate through the adhesive layer, the second substrate is mounted with a frame, an air layer is formed between the first substrate and the second substrate, and a glue injection port is arranged between the first substrate and the second substrate and communicates with the air layer.

[0024] In one of the embodiments, an exhaust passage is arranged between the first substrate and the second substrate, and the exhaust passage is used to exhaust the air in the air layer during the glue injection process.

[0025] In one of the embodiments, the glue injection port and the exhaust passage are both arranged towards the diagonal line of the air layer.

[0026] The display screen structure and the bonding process thereof are described as follows: the adhesive layer is coated on the first substrate first, then the frame is mounted on the second substrate, the first substrate and the second substrate are bonded to form the air layer between the first substrate and the second substrate, and finally the glue is injected into the air layer to realize the overall bonding of the first substrate and the second substrate. Since the adhesive layer is coated first and then a small amount of glue is injected, the problem of uneven thickness of the glue layer caused by the fact that part of the glue does not flow full and part of the glue has begun to semi-solidify during the glue injection process can be avoided as much as possible, so that the problems of light leakage, Mura and yellow spot after the display screen is bonded can be avoided as much as possible. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 FIG. 1 is a sectional view of the display screen structure in the embodiment of the present application.

[0028] Figure 2 FIG. 1 is a sectional view of the display screen structure in the embodiment of the present application.

[0029] Figure 3 FIG. 1 is a sectional view of the display screen structure in the embodiment of the present application.

[0030] Figure 4 FIG. 1 is a sectional view of the display screen structure in the embodiment of the present application.

[0031] BRIEF DESCRIPTION OF DRAWINGS

[0032] 10, first substrate; 100, adhesive layer; 110, ink layer; 20, second substrate; 200, frame; 210, glue injection gap; 220, adhesive strip; 230, air layer; 240, glue injection port. DETAILED DESCRIPTION

[0033] In order to make the above objectives, features and advantages of the present application more apparent and understandable, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, a large number of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0034] In the description of the application, it should be understood that, if there are these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0035] In addition, if there are these terms "first", "second", these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0036] In this application, unless otherwise explicitly specified and limited, if there are terms such as "mounting", "connecting", "connecting", "fixing" and the like, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0037] In this application, unless otherwise explicitly specified and limited, if there are similar descriptions such as "first feature on or under second feature", the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0038] It is to be noted that when an element is referred to as being "fixed" or "set" on another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar terms as used herein are for the purpose of illustration only and do not indicate the only orientation of the application.

[0039] With the development of display screen technology, touch screen as a simple, convenient, natural man-machine interaction device, in various fields such as mobile phones, car navigation systems, industrial control, medical treatment, self-service terminal, etc. has been widely used, greatly convenient for users, especially for the elderly, thus bringing a new user experience.

[0040] In the specific assembly application of the touch screen, the liquid crystal screen assembly is usually carried on the back of the touch screen, and the non-display areas of the two are attached by double-sided adhesive or RTV glue (room temperature vulcanized silicone rubber), so that the two are attached, and then liquid optical glue is injected into the air layer formed between the two, and the liquid optical glue is used to fully attach the touch screen and the liquid crystal screen assembly, so as to improve the attachment effect and display effect.

[0041] However, in the process of injecting glue into the large-size touch screen and the liquid crystal screen assembly, according to the actual operation condition, the amount of glue required for a single display screen is 650g, and the injection time of a single display screen is 27min. Since the injection time is long, when the glue in the air layer is not full, the glue has begun to semi-solidify, thereby causing the thickness of part of the glue layer to be thick and the thickness of part of the glue layer to be small, which easily leads to uneven thickness of the glue layer, and further leads to the problems of light leakage, Mura (a phenomenon that the brightness of a display is not uniform, causing various traces) and yellow spots after the touch screen and the liquid crystal screen assembly are attached.

[0042] Therefore, the application provides a display screen structure and an attachment process thereof. The display screen mounting process provided by the application uses transparent optical adhesive for attachment, ensures the flatness of the display screen, and then injects glue around, so as to avoid the problem of uneven thickness of the glue layer as much as possible, and achieve better attachment effect. The display screen structure and the attachment process thereof in the application will be described below. The embodiments are only used as examples for illustration and do not limit the technical scope of the application.

[0043] Referring to Figure 1 and Figure 2 , Figure 1 and Figure 2The schematic diagram of the display screen structure in the embodiment of the application is shown, the display screen structure provided by the embodiment of the application comprises a first substrate 10 and a second substrate 20, in the embodiment, the first substrate 10 is specifically a protective glass layer (abbreviated as CG), and the second substrate 20 is specifically a display panel layer (abbreviated as LCM), it can be understood that in other embodiments, the first substrate 10 is not limited to CG, and the second substrate 20 is not limited to LCM. The edge of the first substrate 10 is provided with an ink layer 110, and the middle of the first substrate 10 is coated with an adhesive layer 100, and a gap of 4.5-5.5 mm is reserved between the adhesive layer 100 and the ink layer 110. The adhesive layer 100 is specifically a transparent optical adhesive (abbreviated as TOCA) in the embodiment, the transparent optical adhesive has a certain bonding strength, also has high light transmittance, similar refractive index to the transparent optical element, good durability, certain toughness, zero curing shrinkage rate, and no internal stress effect, so that the adhesive layer can ensure the bonding effect between the first substrate 10 and the second substrate 20, and also can realize good light transmission effect.

[0044] Referring to Figure 1 and Figure 2 , the edge of the second substrate 20 is mounted with a frame 200, the frame 200 is specifically an iron frame in the embodiment, it can be understood that in other embodiments, the frame can be other materials, which are not limited here. There is a dispensing gap 210 between the frame 200 and the second substrate 20, and the second substrate 20 is fixedly connected by dispensing UV glue in the dispensing gap 210. After the first substrate 10 and the second substrate 20 are attached, an air layer 230 is formed between the first substrate 10 and the second substrate 20, and the air layer 230 is used for injecting glue.

[0045] Referring to Figure 2 and Figure 3The first substrate 10 and the second substrate 20 are provided with a sticking strip 220, the sticking strip 220 is stuck at the four corner positions of the first substrate 10 and the second substrate 20, and the sticking strip 220 is double-sided adhesive in this embodiment. After the sticking strip 220 is removed, the exhaust passage is formed between the first substrate 10 and the second substrate 20. By arranging the sticking strip 220 between the first substrate 10 and the second substrate 20, the installation and disassembly of the sticking strip 220 are facilitated, the operation is convenient, and the position of the exhaust passage is reserved. There are four exhaust passages in this embodiment, and the four exhaust passages are arranged at the four corner positions between the first substrate 10 and the second substrate 20, and the exhaust passages are arranged towards the diagonal line of the air layer 230. The glue is injected into the air layer 230 by the glue injection equipment, which is a prior art and will not be described here. Before the glue is injected into the air layer 230, one of the exhaust passages is used as a glue injection port 240, and the glue is injected into the air layer 230 from the glue injection port 240. When the glue enters the air layer 230, the gas in the air layer is discharged from the exhaust passage until the air layer 230 is filled with glue, which helps to avoid air bubbles in the air layer as much as possible, and affects the bonding effect of the first substrate 10 and the second substrate 20. After the glue in the air layer 230 is cured, the first substrate 10 and the second substrate 20 are placed to achieve full bonding of the first substrate 10 and the second substrate 20. Specifically, the glue injected into the air layer 230 by the glue injection equipment is AB glue, which is a two-liquid mixed hardening glue. One liquid is the glue, and the other liquid is the hardening agent. The two liquids can be mixed to harden. The AB glue has the characteristics of high bonding strength, high hardness and good anti-yellowing effect.

[0046] Since the existing display screen is installed, the air layer 230 between the protective glass layer and the display panel layer after the protective glass layer and the display panel layer are bonded will affect the display effect after light refraction. By injecting AB glue into the air layer 230, the connection between the first substrate 10 and the second substrate 20 is enhanced, the light reflection is greatly reduced, the light loss is reduced, and the display brightness is improved. In addition, by coating the transparent optical adhesive on the first substrate 10 first, then bonding the first substrate and the second substrate, and injecting glue into the air layer between the first substrate and the second substrate, the coating of a large area of glue and the injection of a small area of glue are realized, which helps to achieve better bonding effect, and can avoid the problem of uneven glue layer thickness caused by partial glue semi-solidification during the process of injecting glue in a large area, can avoid the problems of light leakage, Mura and macula as much as possible, and achieve better light transmission effect.

[0047] Referring to Figure 4 , Figure 4 The flow chart of the display screen bonding process in an embodiment of the application is shown, and the display screen bonding process provided by the embodiment of the application includes the following steps:

[0048] Step S1: providing a first substrate 10 and a second substrate 20, and performing appearance inspection on the first substrate 10 and the second substrate 20. In the embodiment, the first substrate 10 is specifically a cover glass layer (CG for short), and the second substrate 20 is specifically a display panel layer (LCM for short). It can be understood that in other embodiments, the first substrate 10 is not limited to CG, and the second substrate 20 is not limited to LCM;

[0049] Step S2: coating an adhesive layer 100 on the surface of the first substrate 10. Specifically, the adhesive layer 100 is coated on the middle part of the first substrate 10. Since the surface of the first substrate 10 is provided with an ink layer 110, and the ink layer 110 is arranged along the edge of the first substrate 10, when the adhesive layer 100 is coated, a gap of 4.5-5.5 mm is reserved between the adhesive layer 100 and the ink layer 110. The adhesive layer 100 is specifically a transparent optical adhesive in the embodiment. The transparent optical adhesive has a certain bonding strength, and also has high light transmittance, similar refractive index to the transparent optical element, good durability, certain toughness, zero curing shrinkage rate, and no internal stress effect. Therefore, the adhesive layer can ensure the bonding effect between the first substrate 10 and the second substrate 20, and also achieve good light transmission effect. By coating the adhesive layer 100 on the surface of the first substrate 10 first, and controlling the thickness error range of the adhesive layer 100 within 0.05 mm, the problem of uneven stress of the second substrate 20 caused by uneven thickness of the adhesive layer can be reduced, so as to avoid the problems of display screen light leakage and Mura defects as much as possible;

[0050] Meanwhile, the frame 200 is mounted on the edge of the second substrate 20, specifically, the step of mounting the frame 200 on the second substrate 20 can be performed simultaneously with the step of coating the adhesive layer 100 on the first substrate 10, or can be performed sequentially, which is not limited herein. There is a dispensing gap 210 between the frame 200 and the second substrate 20, and the glue is applied and dripped into the dispensing gap 210 by a dispensing device to fix the frame 200 and the second substrate 20, wherein the dispensing device is a prior art, which will not be described in detail in the present embodiment; specifically, the glue applied by the dispensing device in the present embodiment is UV glue; the frame 200 in the present embodiment is specifically an iron frame, and in other embodiments, the frame 200 can be of other materials, which is not limited herein. At present, RTV silicone is usually used to fill the gap between the frame 200 and the second substrate 20 in the prior art, and the RTV silicone is a room temperature vulcanized silicone rubber with long storage period and stable performance, which can bond common metals and non-metal materials and is suitable for bonding and sealing between various metals and between metals and non-metal materials. However, the RTV silicone cannot effectively and smoothly fill the gap between the frame 200 and the second substrate 20 when injecting the glue, and therefore, air bubbles are easily generated between the frame 200 and the second substrate 20 when injecting the RTV silicone. By using the dispensing method instead of the injection method, the amount of glue used by the dispensing method is small and the precision is high, so that the gap between the frame 200 and the second substrate 20 can be filled and the generation of air bubbles can be avoided as much as possible.

[0051] Step S3: Leave an exhaust passage between the first substrate 10 and the second substrate 20 by placing the adhesive strip 220 therebetween, the adhesive strip 220 is attached at the four corner positions of the first substrate 10 and the second substrate 20, and the adhesive strip 220 is specifically double-sided tape in the present embodiment. The adhesive strip 220 is pulled out before injecting the glue into the air layer 230.

[0052] Step S4: Bond the first substrate 10 and the second substrate 20, and stand still, and then fix the first substrate 10 and the second substrate 20 by the adhesive layer 100 after the adhesive layer 100 is cured;

[0053] Step S5: Take one of the four exhaust passages as the glue injection port 240, and inject the glue into the air layer 230 through the glue injection port 240 by the glue injection device, and during the glue injection process, the gas in the air layer 230 can be exhausted from the exhaust passage under the extrusion of the glue, so that the generation of air bubbles in the air layer 230 can be avoided as much as possible;

[0054] Step S6: Stand still the first substrate 10 and the second substrate 20 to allow the glue in the air layer 230 to be cured;

[0055] Step S7: After the glue in the air layer 230 is cured, the display screen is subjected to appearance inspection and lighting inspection.

[0056] The display screen bonding process described above first provides the first substrate 10 and the second substrate 20 through step S1, then coats the adhesive layer 100 on the first substrate 10 through step S2, at the same time, installs the frame 200 on the second substrate 20, then places the sticking strip 220 between the first substrate 10 and the second substrate 20 through step S3, reserves the glue injection port 240 and the exhaust channel, bonds the first substrate 10 and the second substrate 20 through step S4, forms the air layer 230 between the first substrate 10 and the second substrate 20, finally injects glue into the air layer 230 from the glue injection port 240 through step S5, after the glue is cured through step S6, appearance inspection and lighting inspection are performed through step S7. The whole bonding process can on the one hand avoid the problem of uneven stress of the second substrate 20 caused by uneven thickness of the glue layer as much as possible, and can also avoid the problems of light leakage and Mura as much as possible; on the other hand, the frame 200 is fixed by the glue injection method instead of the glue injection method, which can improve the problem of air bubbles caused by incomplete filling of glue injection, and is helpful to achieve better bonding effect.

[0057] Further, in step S7, the lighting inspection refers to light leakage detection of the display screen in a dark room, and the detection method is as follows: the display screen is divided into 9 test points, and light leakage detection is performed on the 9 test points respectively. According to the light leakage test experimental results, there is no light leakage phenomenon in the display screen in the above steps S1-S7 at 25 gray scale; there is also no light leakage phenomenon in the above steps S1-S7 at 10 gray scale after adding a light transmission sheet with a light transmission rate of 95%; at 0 gray scale, after adding a light transmission sheet with a light transmission rate of 97%, some test points cannot be covered. According to the test results, at 25 gray scale and 10 gray scale, there is no light leakage phenomenon at the 9 test point positions of the display screen, therefore, the display screen bonding process provided by the present application can realize good light leakage prevention effect on the premise of ensuring the bonding effect, and can also avoid the problem of uneven thickness of the glue layer caused by the fact that part of the glue does not flow full and part of the glue has begun to semi-cure during the glue injection process, thereby avoiding the problems of light leakage, Mura and yellow spot after the display screen is bonded as much as possible.

[0058] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present disclosure.

[0059] The above-described embodiments are merely illustrative of several embodiments of the present application, which are described in more detail and in a specific manner, but should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A display screen bonding process, characterized in that, Includes the following steps: An adhesive layer is coated on the first substrate; An ink layer is provided on the edge of the first substrate. The step of coating the adhesive on the first substrate includes: coating the adhesive layer on the middle part of the first substrate, so that there is a gap between the adhesive layer and the ink layer. A frame is mounted on the second substrate; The second substrate is bonded to the adhesive layer on the first substrate to form an air layer between the first substrate and the second substrate, and a glue injection port is reserved between the first substrate and the second substrate. Adhesive is injected into the air layer through the injection port, so that the first substrate and the second substrate are completely bonded together.

2. The display screen bonding process according to claim 1, characterized in that, Before the step of injecting adhesive into the air layer through the injection port to completely bond the first substrate and the second substrate, the following steps are included: An exhaust channel is reserved between the first substrate and the second substrate.

3. The display screen bonding process according to claim 2, characterized in that, The exhaust channels are located at the four corners between the first substrate and the second substrate.

4. The display screen bonding process according to claim 2, characterized in that, The step of reserving an exhaust channel between the first substrate and the second substrate includes: Adhesive strips are placed at the four corners between the first substrate and the second substrate; Remove the adhesive strip to form the exhaust channel.

5. The display screen bonding process according to claim 1, characterized in that, The step of mounting the frame on the second substrate includes: There is a glue-dispensing gap between the frame and the second substrate. Glue is dispensed into the glue-dispensing gap to bond the frame to the second substrate.

6. The display screen bonding process according to claim 1, characterized in that, Prior to the step of injecting adhesive into the air layer, the method further includes the following step: The first substrate and the second substrate are left to stand to allow the adhesive layer to cure. And / or, after the step of injecting adhesive into the air layer, the following steps are included: The first substrate and the second substrate are left to stand to allow the injected adhesive to cure.

7. A display screen structure, characterized in that, The display screen is manufactured by the display screen bonding process according to any one of claims 1-6. The display screen structure includes a first substrate and a second substrate. An adhesive layer is provided on the first substrate. The first substrate is connected to the second substrate through the adhesive layer. A frame is installed on the second substrate. An air layer is formed between the first substrate and the second substrate. There is a glue injection port between the first substrate and the second substrate that communicates with the air layer.

8. The display screen structure according to claim 7, characterized in that, An exhaust channel is provided between the first substrate and the second substrate, and the exhaust channel is used to discharge air from the air layer during the glue injection process.

9. The display screen structure according to claim 8, characterized in that, Both the glue injection port and the exhaust channel are positioned diagonally opposite the air layer.

10. The display screen structure according to claim 7, characterized in that, The frame is made of iron.

Images