Anti-static coating and display panel comprising same

Abstract

The invention provides an antistatic coating and a display panel comprising the antistatic coating, the antistatic coating comprises the following raw materials by mass: 20-60 parts of thermoplastic resin selected from at least one of polyester resin, polyurethane, acrylate resin, polycarbonate resin and phenolic resin; 0.1-10 parts of an inorganic filler; 0.1-40 parts of an antistatic agent, wherein the antistatic agent is selected from at least one of carbon black, graphite, graphene and carbon nanotubes; 0.1 to 10 parts of a thermal curing agent; and 20-80 parts of a solvent. The anti-static coating comprises carbon particles such as carbon black, graphite, graphene and carbon nanotubes, the carbon particles have excellent heat-conducting property, and a coating layer has good reflectivity and optical density value by adjusting the proportion of the carbon particles in the coating; therefore, the display panel obtains the coating with excellent shading effect and heat-conducting property, a shading adhesive tape layer and a double-sided adhesive layer of the display panel in the existing structure can be replaced, and the manufacturing process of the display panel is simplified.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to an antistatic coating and a display panel comprising the same. Background Art

[0002] Organic Light-Emitting Diode (OLED) self-luminous display panels are pixel-controlled, that is, each pixel area has a driving pixel circuit, including circuit switches and power lines ELVSS and ELVDD, etc. OLED self-luminous display panels can maintain almost the same color gamut for both dark and bright scenes, and the colors are more accurate. However, the driving pixel circuit will generate heat when powered on, and overheating will have an adverse effect on the life of the OLED light-emitting layer and the electrical properties of the thin film transistor (TFT), increasing the risk of screen afterimages, black spots, screen burn-in, and other adverse effects.

[0003] Figure 1 The structure diagram of the existing OLED self-luminous display panel is shown in FIG. 1. In order to increase the strength of the OLED display panel, a double-sided adhesive layer (DST) 9' and a light-shielding tape 8' (Rear Tape) are provided on a surface of the low-temperature polysilicon (substrate) 10' (LTPS) away from the display unit 20'. Of course, the display panel also includes a glass paste 21' (Frit) coated on the edge of the display unit sealing area to form a closed pattern, an encapsulation layer 30' and / or a polarizing layer 40' covering the display unit 20', etc. The material of the light-shielding tape 8' is generally foam (Foam) or polyethylene terephthalate (PET). Foam is a material made of foamed plastic particles; PET is commonly known as polyester resin, which has good heat resistance, mechanical strength and environmental protection performance. However, the thermal conductivity of Foam is 0.03-0.08W / (mK), and the thermal conductivity of PET is 0.2W / (mK). Accordingly, the thermal conductivity of the light-shielding tape 8' and the double-sided adhesive layer 9' is 0.2W / (mK), both of which are low thermal conductivity materials, and Foam is an insulating material, which is not conducive to the heat dissipation of the OLED self-luminous display.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute the prior art known to those skilled in the art. Summary of the invention

[0005] In view of the problems in the prior art, the purpose of the present invention is to provide an antistatic coating and a display panel including the same, which adjusts the weight ratio of carbon particles such as carbon black, graphite, graphene and carbon nanotubes in the antistatic coating, adjusts the reflectivity, optical density OD value and thermal conductivity of the coating, thereby obtaining a coating with both excellent light-shielding effect and thermal conductivity. The above-mentioned coating is applied to the display panel, and the obtained coating has both light-shielding effect and thermal conductivity, thereby replacing the light-shielding tape layer and double-sided adhesive layer of the display panel in the existing structure, thereby simplifying the manufacturing process of the display panel.

[0006] The first aspect of the present invention provides an antistatic coating, the coating comprising the following raw materials of each component in parts by mass:

[0007] 20-60 parts of a thermoplastic resin, wherein the thermoplastic resin is selected from at least one of a polyester resin, a polyurethane, an acrylate resin, a polycarbonate resin and a phenolic resin;

[0008] Inorganic filler 0.1-10 parts;

[0009] 0.1-40 parts of an antistatic agent, wherein the antistatic agent is selected from at least one of carbon black, graphite, graphene and carbon nanotubes;

[0010] 0.1-10 parts of thermal curing agent; and

[0011] Solvent 20-80 parts.

[0012] According to the first aspect of the present invention, the antistatic agent is uniformly distributed in the antistatic coating, and / or the thermal conductivity of the antistatic agent is 100 W / (mK) to 5200 W / (mK).

[0013] According to the first aspect of the present invention, the antistatic agent is carbon black, and the amount of the antistatic agent is 13 parts.

[0014] A second aspect of the present invention provides a display panel, comprising an antistatic coating made of the antistatic coating, wherein the antistatic coating is disposed on a surface of a substrate of the display panel that is away from a display unit.

[0015] According to a second aspect of the present invention, the antistatic coating is prepared by curing the antistatic coating, and the curing treatment includes ultrasonic heating curing, microwave heating curing, far infrared heat curing or ultraviolet curing.

[0016] According to the second aspect of the present invention, the antistatic coating has a thickness of 5 μm to 100 μm.

[0017] According to the second aspect of the present invention, the thermal conductivity of the antistatic coating is 0.2 W / (mK).

[0018] According to the second aspect of the present invention, the antistatic agent of the antistatic coating contains 13 parts of carbon black.

[0019] According to the second aspect of the present invention, the reflectivity of the antistatic coating is less than 5.5%, and / or the optical density OD value of the antistatic coating is greater than 3.

[0020] According to the second aspect of the present invention, the resistance of the antistatic coating is 10 6 Ω~10 9 Ω.

[0021] The antistatic coating of the present invention includes at least one carbon-based particle such as carbon black, graphite, graphene and carbon nanotubes. The above-mentioned carbon-based particles have excellent thermal conductivity. By adjusting the proportion of the above-mentioned carbon-based particles in the antistatic coating, the antistatic coating layer has good reflectivity and optical density value, so that the display panel can obtain a coating with excellent light-shielding effect and thermal conductivity, which can replace the light-shielding tape layer and double-sided adhesive layer of the display panel in the existing structure, simplifying the manufacturing process of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, purposes and advantages of the present invention will become more apparent. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same figure numbers in the figures represent the same or similar parts, and their repeated descriptions will be omitted. Some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0023] Figure 1 is a schematic diagram of the structure of an existing display panel;

[0024] Figure 2 A schematic structural diagram of a display panel according to an embodiment of the present invention.

[0025] Reference numerals

[0026] 8' Blackout Tape

[0027] 9' double-sided adhesive layer

[0028] 10', 10 base plate

[0029] 20', 20 display units

[0030] 21', 21 Glass glue

[0031] 30', 30 encapsulation layer

[0032] 40', 40 polarizing layer

[0033] 90 Antistatic coating DETAILED DESCRIPTION

[0034] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the disclosure will be more comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0035] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like mean that the specific features, structures, materials or characteristics represented in conjunction with the embodiment or example are included in at least one embodiment or example of this specification. Moreover, the specific features, structures, materials or characteristics represented may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples represented in this specification without contradiction.

[0036] Throughout the specification, when it is said that a device is "connected" to another device, this includes not only the situation of "direct connection" but also the situation of "indirect connection" by placing other elements therebetween. Terms indicating relative spaces such as "below" and "above" may be used to more easily explain the relationship of one device illustrated in the accompanying drawings relative to another device. Such terms refer not only to the meanings indicated in the accompanying drawings, but also to other meanings or operations of the device in use. For example, if the device in the accompanying drawings is turned over, a device that was described as being "below" other devices is described as being "above" other devices. Therefore, the exemplary term "below" includes both above and below. The device can be rotated 90° or other angles, and the terms representing relative spaces are interpreted accordingly.

[0037] Although the terms first, second, etc. are used to represent various elements in some examples, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, the first interface and the second interface, etc. are represented. Moreover, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate that there are the described features, steps, operations, elements, components, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or more other features, steps, operations, elements, components, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way, will there be an exception to this definition.

[0038] Although not defined differently, all terms, including technical and scientific terms used herein, have the same meaning as those generally understood by those skilled in the art to which this specification belongs. Terms defined in commonly used dictionaries are additionally interpreted as having meanings consistent with the relevant technical literature and the contents of the current disclosure, and unless defined, shall not be overly interpreted as ideal or very formal meanings.

[0039] The present invention provides an antistatic coating and a display panel including the same, the antistatic coating comprising the following raw materials of each component by mass: 20-60 parts of thermoplastic resin, the thermoplastic resin is selected from at least one of polyester resin, polyurethane, acrylate resin, polycarbonate resin and phenolic resin; 0.1-10 parts of inorganic filler; 0.1-40 parts of antistatic agent, the antistatic agent is selected from at least one of carbon black, graphite, graphene and carbon nanotube; 0.1-10 parts of thermosetting agent; and 20-80 parts of solvent. The antistatic coating of the present invention comprises at least one carbon-based particle such as carbon black, graphite, graphene and carbon nanotube, the carbon-based particles have excellent thermal conductivity, and by adjusting the proportion of the carbon-based particles in the antistatic coating, the antistatic coating layer has good reflectivity and optical density value, so that the display panel can obtain a coating with both excellent light shielding effect and thermal conductivity, which can replace the light shielding tape layer and double-sided adhesive layer of the display panel in the existing structure, simplifying the manufacturing process of the display panel.

[0040] The antistatic coating of the present invention and the display panel including the same are further described below in conjunction with the accompanying drawings and specific embodiments. It can be understood that the various specific embodiments are not intended to limit the protection scope of the present invention.

[0041] The antistatic coating of the present invention comprises the following raw materials of each component by mass: 20-60 parts of thermoplastic resin, wherein the thermoplastic resin is selected from at least one of polyester resin, polyurethane, acrylate resin, polycarbonate resin and phenolic resin; 0.1-10 parts of inorganic filler, wherein the inorganic filler can be

[0042] 0.1-40 parts of an antistatic agent, wherein the antistatic agent is selected from at least one of carbon black, graphite, graphene and carbon nanotubes; 0.1-10 parts of a thermal curing agent; and 20-80 parts of a solvent.

[0043] Specifically, 40g polyester resin (hydroxyl value = 8mgKOH / g), 30g triethylene glycol monomethyl ether, and 20g propylene glycol methyl ether acetate were put into a reaction bottle with a fixed agitator, a heater, and nitrogen, and stirring was turned on. The stirring speed was 80rpm, and the temperature was raised to 60°C and stirred for 12h. After the resin was completely dissolved, 2.5g fumed silica (inorganic filler), 2.0g conductive carbon black CABOTBP2000 (antistatic agent), 1.0g isocyanate curing agent (Wanhua HT-100), and 0.3g polyether modified dimethyl polysiloxane (leveling agent BYK-331) were added. After stirring for 30min, the experiment was terminated, and the obtained product was ground using a horizontal grinder to make it evenly dispersed to obtain a thermosetting antistatic coating. Samples 1# to 6# below were all obtained by the above method.

[0044] In some embodiments, the thermal conductivity of the antistatic agent can be between 100 W / (mK) and 5200 W / (mK) by selecting different components. At the same time, in order to improve the uniformity of the coating obtained by the coating later, the coating itself needs to have a certain uniformity, including uniform thermal conductivity and light transmittance. Accordingly, the antistatic agent, such as carbon black, graphite, graphene and carbon nanotubes, should be evenly distributed in the antistatic coating.

[0045] Further, the experiment found that when the antistatic agent is carbon black, it is easier to adjust the color of the coating to black by carbon black. Thus, by further adjusting the proportion of carbon black in the antistatic coating, the light-shielding performance and thermal conductivity of the antistatic coating are optimized. Preferably, the mass parts of carbon black in the coating are 13 parts.

[0046] The antistatic coating of the present invention has both excellent light shielding effect and thermal conductivity. The above coating is applied to the display panel to replace the light shielding tape layer and double-sided adhesive layer of the display panel in the existing structure, thereby simplifying the manufacturing process of the display panel. The present invention also provides a display panel, comprising an antistatic coating prepared from the antistatic coating, Figure 2A schematic structural diagram of a display panel according to an embodiment of the present invention, specifically, the display panel includes a substrate 10, a display unit 20, a glass paste 21 having a closed pattern coated on the edge of a sealing area of ​​the display unit 20, an encapsulation layer 30 and / or a polarizing layer 40 covering the display unit 20, and the substrate 10 of the display panel may be low-temperature polycrystalline silicon, and an antistatic coating 90 is provided on a surface thereof facing away from the display unit 20.

[0047] The antistatic coating 90 can be obtained by curing the antistatic coating. Specifically, the antistatic coating can be applied to the surface of the substrate 10 away from the display unit 20 by spin coating or the like, and then cured by the curing treatment, such as ultrasonic heating curing, microwave heating curing, far infrared heat curing or ultraviolet curing, etc., to cure the liquid antistatic coating. By adjusting the density of the antistatic coating itself, the thickness of the antistatic coating applied, and other process parameters, the thickness of the antistatic coating obtained after curing can be controlled. Preferably, the thickness of the antistatic coating is 5 μm to 100 μm. The thermal conductivity of the antistatic coating is 0.2 W / (mK), that is, the antistatic coating has excellent thermal conductivity.

[0048] In one embodiment, carbon black is selected as the antistatic agent, and the mass fraction of the antistatic agent is adjusted to 13 parts. When the thickness of the antistatic coating is between 7-15 μm, the reflectivity of the antistatic coating is less than 5.5%, and the optical density OD (optical density) value of the antistatic coating is greater than 3. At this time, the antistatic coating achieves the best shading effect and thermal conductivity effect. At the same time, the resistance value of the antistatic coating can be controlled to be 10 6 Ω~10 9 Ω, that is, the antistatic coating has excellent antistatic effect, which can improve the static Mura phenomenon of film tearing of the display panel.

[0049] Furthermore, a display panel prepared in this embodiment (carbon black is used as an antistatic agent, with a mass fraction of 13 parts) was selected to conduct a comparative experiment with an existing display panel. Table 1 is a table of test data on the adhesion reliability of the antistatic coating prepared by the antistatic coating of the present invention, Table 2 is a table of comparative data on the antistatic performance of the antistatic coating, and Table 3 is a table of comparative data on the measured heating temperatures of the existing display panel and the display panel of the present invention.

[0050] Table 1 is the test data of the adhesion reliability of the antistatic coating prepared by the antistatic coating of the present invention

[0051]

[0052] Table 2 is a comparison of the antistatic properties of the existing antistatic coating and the antistatic coating of the present invention.

[0053]

[0054]

[0055] Table 3 is the measured heating temperature comparison data of the existing display panel and the display panel of the present invention

[0056]

[0057] It can be seen from Table 1 that the antistatic coating of the present invention can meet the requirements of adhesion in actual use. At the same time, the heat dissipation performance of the display panel of the present invention is lower than that of the existing display panel, as shown in Table 3, which further proves that the antistatic coating of the present invention has good heat dissipation performance and also has a light shielding effect.

[0058] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or basic features of the present application. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present application is limited by the attached claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present application. Any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. An antistatic coating, characterized in that: The invention comprises the following raw materials of each component in parts by mass: 20-60 parts of a thermoplastic resin, wherein the thermoplastic resin is selected from at least one of a polyester resin, a polyurethane, an acrylate resin, a polycarbonate resin and a phenolic resin; Inorganic filler 0.1-10 parts; 0.1-40 parts of an antistatic agent, wherein the antistatic agent is selected from at least one of carbon black, graphite, graphene and carbon nanotubes; Thermal curing agent 0.1-10 parts; as well as 20-80 parts of solvent.

2. The antistatic coating according to claim 1, characterized in that: The antistatic agent is evenly distributed in the antistatic coating, and / or the thermal conductivity of the antistatic agent is 100 W / (mK) to 5200 W / (mK).

3. The antistatic coating according to claim 1, characterized in that: The antistatic agent is carbon black, and the antistatic agent is 13 parts.

4. A display panel, characterized in that: An antistatic coating prepared from the antistatic coating according to any one of claims 1 to 3, wherein the antistatic coating is arranged on a surface of a substrate of a display panel away from a display unit.

5. The display panel according to claim 4, characterized in that: The antistatic coating is prepared by curing the antistatic paint, and the curing treatment includes ultrasonic heating curing, microwave heating curing, far infrared heat curing or ultraviolet curing.

6. The display panel according to claim 4, characterized in that: The thickness of the antistatic coating is 5 μm to 100 μm.

7. The display panel according to claim 4, characterized in that: The thermal conductivity of the antistatic coating is 0.2 W / (mK).

8. The display panel according to claim 4, characterized in that: The antistatic agent of the antistatic coating contains 13 parts of carbon black.

9. The display panel according to claim 8, characterized in that: The reflectivity of the antistatic coating is less than 5.5%, and / or the optical density OD value of the antistatic coating is greater than 3.

10. The display panel according to claim 8, characterized in that: The resistance of the antistatic coating is 10 6 Ω~10 9 Ω.

Images