CN112116873A - Rollable display device and preparation method of heat-conducting adhesive layer - Google Patents
Rollable display device and preparation method of heat-conducting adhesive layer Download PDFInfo
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- CN112116873A CN112116873A CN202011017523.9A CN202011017523A CN112116873A CN 112116873 A CN112116873 A CN 112116873A CN 202011017523 A CN202011017523 A CN 202011017523A CN 112116873 A CN112116873 A CN 112116873A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/10—Homopolymers or copolymers of methacrylic acid esters
- C09J133/12—Homopolymers or copolymers of methyl methacrylate
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J183/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
- C09J183/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/28—Nitrogen-containing compounds
- C08K2003/282—Binary compounds of nitrogen with aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The flexible display panel comprises a display device, a support piece and a heat-conducting adhesive layer, wherein the display device, the support piece and the heat-conducting adhesive layer are arranged in a stacked mode, the heat-conducting adhesive layer is arranged between the display device and the support piece, the support piece is arranged on one side, close to the scroll, of the display device, and the heat-conducting coefficient of the heat-conducting adhesive layer is 1W/m-degree to 5W/m-degree; the problem of brightness difference caused by nonuniform heating of the display device for a long time is solved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a rollable display device and a preparation method of a heat-conducting adhesive layer.
Background
An Organic Light Emitting Diode (OLED) is an active Light Emitting display device, and has the advantages of self-luminescence, wide viewing angle, high contrast, low power consumption, wide color gamut, Light weight, thinness, and special shape. With the continuous development of display technology, OLED technology is increasingly applied to flexible displays and transparent displays. Transparent display is an important branch of display technology, and means that an image is displayed in a transparent state, so that a viewer can see not only an image in a display device but also a scene behind the display device, and Virtual Reality/Augmented Reality (VR/AR) and 3D display functions can be realized.
Flexible display devices have been developed in recent years as an important application technology of OLEDs. Compared with the traditional display device, the flexible display device has remarkable advantages, such as lighter and thinner volume and lower power consumption, and the application scenes of the flexible display device are wider and wider due to the characteristics of flexibility, good flexibility and the like.
At present, the flexible display device is difficult to meet the ball and pen drop test of leaving the factory because each layer of structure is low in thickness and is made of flexible film base materials. Therefore, it is necessary to add a support structure to the display device, but if the support structure is too hard, it is difficult to curl. If the structural rigidity of the supporting part is low, the use requirement of a user cannot be met.
At present, a patterned support member structure or a bamboo joint type support member structure is adopted in a flexible display device structure. The patterned support member structure or the bamboo joint type support member structure has uneven heat conductivity coefficient, so that the display device is heated unevenly, and the problem of uneven brightness of the display device is caused.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a rollable display device and a method for preparing a thermal conductive adhesive layer, so as to solve the problem of brightness difference caused by nonuniform heating of a display device for a long time.
The embodiment of the invention provides a rollable display device, which comprises a scroll and a flexible display panel arranged on the outer side of the scroll, wherein the flexible display panel comprises a display device, a supporting piece and a heat-conducting glue layer, the display device, the supporting piece and the heat-conducting glue layer are arranged in a stacked mode, the heat-conducting glue layer is positioned between the display device and the supporting piece, the supporting piece is positioned on one side, close to the scroll, of the display device, and the heat-conducting glue layer has a heat conductivity coefficient of 1W/m.degree to 5W/m.degree.
In an exemplary embodiment, the glass transition temperature of the thermal adhesive layer is less than-40 degrees celsius; and/or the viscosity of the heat-conducting adhesive layer is more than 1000 gram force/25 mm; and/or the dielectric strength of the heat-conducting adhesive layer is 15 kilovolt/millimeter to 20 kilovolt/millimeter; and/or the volume resistivity of the thermal conductive adhesive layer is 1 x 1011 ohm-cm to 2 x 1014 ohm-cm.
In an exemplary embodiment, the storage modulus of the thermal conductive adhesive layer is 80KPa to 250KPa at 25 ℃; and/or the storage modulus of the thermal conductive adhesive layer is less than 1000KPa at-20 ℃; and/or the storage modulus of the thermal conductive adhesive layer is more than 50KPa at 80 ℃.
In an exemplary embodiment, the thermal conductive adhesive layer includes a resin and nano thermal conductive particles.
In an exemplary embodiment, the resin is acryl resin or silicone resin.
In an exemplary embodiment, the material of the nano heat conducting particles includes one or a combination of several of ceramic, spherical or non-spherical alumina, and spherical or non-spherical aluminum nitride powder.
In an exemplary embodiment, the nano thermally conductive particles have a particle size of 50nm to 500 nm.
In an exemplary embodiment, the mass percentage of the nano thermal conductive particles in the thermal conductive adhesive layer is 15% to 45%.
A preparation method of a heat-conducting adhesive layer comprises the following steps:
adding a dispersing agent and a coupling agent into a solvent for mixing to form a mixed solution;
adding resin and nano heat conducting particles into the mixed solution under the condition of stirring;
then adding the pressure-sensitive adhesive, the auxiliary agent and the curing agent into the mixed solution in sequence;
and curing and drying the mixed solution to form the heat-conducting adhesive layer.
In an exemplary embodiment, the dispersant is one or more of a silane coupling agent or a titanate coupling agent; and/or the coupling agent is one or more of silane coupling agent and titanate coupling agent; and/or the solvent is one or more of ethyl acetate, toluene, butyl acetate and dimethyl carbonate; and/or the pressure-sensitive adhesive is an acrylic pressure-sensitive adhesive; and/or the auxiliary agent is one or more of a flatting agent, a defoaming agent and a base material wetting agent; and/or the curing agent is an isocyanate or epoxy curing agent.
The embodiment of the invention provides a rollable display device and a preparation method of a heat-conducting adhesive layer.
Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the embodiments of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention. The shapes and sizes of the various elements in the drawings are not to scale and are merely intended to illustrate the invention.
Fig. 1 is a schematic structural diagram of a rollable display device according to an embodiment of the present disclosure;
fig. 2 is a cross-sectional view of a rollable display device provided by an embodiment of the present disclosure;
fig. 3 is a cross-sectional view of a thermal conductive adhesive layer in a rollable display device according to an embodiment of the present disclosure.
Detailed Description
The following detailed description of embodiments of the invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The embodiment of the application provides a display device can curl, including the spool and set up in the flexible display panel in the spool outside, flexible display panel is including display device, the support piece of range upon range of setting and being located display device with heat-conducting glue layer between the support piece, support piece is located display device is close to one side of spool, heat-conducting glue layer's coefficient of heat conductivity is 1 watt/meter degree to 5 watt/meter degree.
The display device that can curl that this application embodiment provided makes display device be heated evenly through setting up the heat-conducting glue layer between display device and support piece, solves because display device's the inhomogeneous problem of luminance difference that leads to of being heated.
Fig. 1 is a schematic structural diagram of a rollable display device according to an embodiment of the present disclosure. As shown in fig. 1, the rollable display device includes a roll 1 and a flexible display panel 2. The reel 1 is generally cylindrical. The flexible display panel 2 is located outside the roll 1. The rollable display device is in a rolled-out state of the flexible display panel 2 when in use, and the flexible display panel 2 is rolled out of the roll 1 when not in use.
Fig. 2 is a cross-sectional view of a rollable display device provided by an embodiment of the present disclosure. As shown in fig. 2, the flexible display panel 2 includes a display device 30, a support member 10, and a thermal adhesive layer 20 between the display device 30 and the support member 10. The support member 10 is located on one side of the flexible display panel 2 close to the reel 1, and plays a role in supporting and protecting the display device 30, so that damage to the display device 30 in the using process is reduced. The display device 30 is used to display an image. The thermal conductivity of the thermal conductive adhesive layer 20 is 1 w/m.degree to 5 w/m.degree, which is used to make the display device 30 heated uniformly and solve the problem of brightness difference caused by non-uniform heating of the display device 30. Wherein, the support 10 may be a patterned support.
In an exemplary embodiment, a display device adopts a thin film layer structure, and the display device comprises a flexible substrate, and a light emitting layer and a flexible cover plate which are stacked on the flexible substrate; the light emitting layer is provided with an OLED light emitting device for emitting light. The flexible substrate is a substrate of the display device, and adjacent film layers are connected through a bonding layer. Wherein the thickness of the flexible cover plate is not less than that of the flexible substrate, so that the neutral layer can be positioned in the EL layer or the TFE layer in the luminous layer after the flexible cover plate is arranged. In the bending process of the display device, the inner layer is extruded, the outer layer is stretched, the neutral layer is a transition layer which is not subjected to tensile stress or compressive stress or almost not subjected to tensile stress or compressive stress, the light-emitting layer can be subjected to smaller stress strain in the curling process, and the effect of protecting an OLED light-emitting device in the light-emitting layer is achieved.
In the exemplary embodiment, the arrangement form of the supporting member in the flexible display panel is various, and it is sufficient to achieve the supporting and protecting effect on the flexible display panel, for example, the supporting member may be arranged in a structure of a long bar shape, and is located at two side edges of the display device; or the support is of a film layer structure, is arranged in a stacking mode with the display device and covers the whole display device.
Fig. 3 is a cross-sectional view of a thermal conductive adhesive layer in a rollable display device according to an embodiment of the present disclosure. As shown in fig. 3, the thermal conductive adhesive layer 20 includes a resin 202 and nano thermal conductive particles 201, and the nano thermal conductive particles 201 are dispersed in the resin 202. The mass percentage of the nano heat-conducting particles 201 in the heat-conducting adhesive layer 20 is 15% to 45%. The material of the nano heat conducting particles 201 may include one or a combination of several of ceramic, spherical or non-spherical alumina, and spherical or non-spherical aluminum nitride powder.
In an exemplary embodiment, the nano thermally conductive particles 201 have a particle size of 50nm to 500nm, which provides the thermally conductive adhesive layer 20 with better adhesive properties, crimpability properties, and thermal conductive properties.
In an exemplary embodiment, the resin 202 is an acryl resin or a silicone resin, so that the thermal conductive adhesive layer 20 has better adhesive property, crimpability property, and thermal conductive property.
In an exemplary embodiment, the recoverability of the rollable display device may be up to 92%. The test method of the recoverability comprises the following steps: the rollable display device was repeatedly stretched using a stretcher at a stretching rate of 300 mm/min to 100% strain, the force was released and recovered, and the cycle was repeated 2000 times.
In an exemplary embodiment, the glass transition temperature of the thermal conductive adhesive layer 20 is less than minus 40 degrees celsius, which can ensure the bendability of the thermal conductive adhesive layer. The glass transition temperature is a transition of the heat-conducting adhesive layer from a viscoelastic state to a glass state, and when the heat-conducting adhesive layer is changed from the adhesive to the glass state, the heat-conducting adhesive layer becomes hard, the storage modulus becomes high, and the heat-conducting adhesive layer is difficult to bend.
In an exemplary embodiment, the viscosity of the thermal conductive adhesive layer 20 is greater than 1000 gf/25 mm, thereby enabling the thermal conductive adhesive layer to bond the display device to the support member more firmly.
In an exemplary embodiment, the storage modulus G' of the thermal adhesive layer 20 is 80KPa to 250KPa (80KPa to 250KPa @25 ℃) at 25 ℃; and/or the storage modulus of the thermal conductive adhesive layer 20 is less than 1000KPa (less than 1000KPa @ -20 ℃) at-20 ℃; and/or the storage modulus of the thermal conductive adhesive layer 20 is greater than 50KPa (greater than 50KPa @80 ℃) at 80 ℃; the storage modulus of the thermal conductive adhesive layer 20 can improve the deformation resistance of the thermal conductive adhesive layer 20, and prevent the thermal conductive adhesive layer 20 from deforming in the curling process.
In an exemplary embodiment, the dielectric strength of the thermal conductive adhesive layer 20 is 15 kv/mm to 20 kv/mm, so that the dielectric strength of the thermal conductive adhesive layer is large, the insulating property of the thermal conductive adhesive layer is ensured, and the device is prevented from being damaged by electric charges in the display device. Dielectric strength is a measure of the electrical strength of a material as an insulator, and is defined as the maximum voltage that a unit thickness can withstand when a sample is broken down, expressed in volts per unit thickness.
In an exemplary embodiment, the volume resistivity of the thermal conductive adhesive layer 20 is 1 × 1011 ohm-cm to 2 × 1014 ohm-cm. The heat-conducting adhesive layer can block current, and the insulating property of the heat-conducting adhesive layer is ensured.
As shown in fig. 2, the flexible display panel 2 further includes an adhesive layer 40 disposed on the display device 30 and a cover plate 50. The cover plate 50 is adhered to the display device 30 by the adhesive layer 40. The cover plate 50 serves to protect the display device 30.
In an exemplary embodiment, the flexible display panel further includes an optical film layer disposed between the adhesive layer and the display device, the optical film layer including a functional film layer such as a polarizer and a touch screen.
The embodiment of the invention also discloses a preparation method of the heat-conducting adhesive layer, which comprises the following steps:
s1, adding a dispersing agent and a coupling agent into a solvent, and mixing to form a mixed solution;
weighing a dispersing agent and a coupling agent, diluting the weighed dispersing agent and coupling agent with a solvent, and adding resin and nano heat conducting particles into a mixed solution of the diluted dispersing agent and coupling agent under the stirring condition;
s2, adding resin and nano heat conducting particles into the mixed solution under the stirring condition;
s3, sequentially adding the pressure-sensitive adhesive, the auxiliary agent and the curing agent into the mixed solution;
s4, coating the mixture on a release film, and curing and drying at 80-100 ℃ for 5-10 min to form the heat-conducting adhesive layer by the mixed liquid.
Wherein, the dispersant can be one or more of silane coupling agent or titanate coupling agent. The coupling agent can be one or more of silane coupling agent and titanate coupling agent. The solvent can be one or more of ethyl acetate, toluene, butyl acetate and dimethyl carbonate. The pressure sensitive adhesive may be an acrylic pressure sensitive adhesive. The auxiliary agent can be one or more of a leveling agent, a defoaming agent and a base material wetting agent. The curing agent may be an isocyanate or epoxy curing agent.
In the description of the embodiments of the present invention, it should be understood that the terms "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The rollable display device is characterized by comprising a scroll and a flexible display panel arranged outside the scroll, wherein the flexible display panel comprises a display device, a supporting piece and a heat-conducting adhesive layer, the display device, the supporting piece and the heat-conducting adhesive layer are stacked, the heat-conducting adhesive layer is positioned between the display device and the supporting piece, the display device is close to one side of the scroll, and the heat-conducting adhesive layer has a heat conductivity of 1W/m-degree to 5W/m-degree.
2. The rollable display device of claim 1, wherein the glass transition temperature of the thermal adhesive layer is less than-40 degrees celsius; and/or the viscosity of the heat-conducting adhesive layer is more than 1000 gram force/25 mm; and/or the dielectric strength of the heat-conducting adhesive layer is 15 kilovolt/millimeter to 20 kilovolt/millimeter; and/or the volume resistivity of the heat-conducting adhesive layer is 1 multiplied by 1011Ohm cm to 2 x 1014Ohm cm.
3. The rollable display device according to claim 1, wherein the thermal conductive adhesive layer has a storage modulus of 80-250 KPa at 25 ℃; and/or the storage modulus of the thermal conductive adhesive layer is less than 1000KPa at-20 ℃; and/or the storage modulus of the thermal conductive adhesive layer is more than 50KPa at 80 ℃.
4. The rollable display device of claim 1, wherein the thermal adhesive layer comprises a resin and nano thermal conductive particles.
5. A rollable display device according to claim 4, wherein the resin is an acrylic resin or a silicone resin.
6. The rollable display device according to claim 4, wherein the material of the nano heat conductive particles comprises one or more of ceramics, spherical or non-spherical alumina, and spherical or non-spherical aluminum nitride powder.
7. A rollable display device according to claim 4, wherein the nano thermally conductive particles have a particle size of 50nm to 500 nm.
8. The rollable display device according to claim 4, wherein the mass percentage of the nano thermally conductive particles in the thermally conductive glue layer is 15% to 45%.
9. A preparation method of a heat-conducting adhesive layer is characterized by comprising the following steps:
adding a dispersing agent and a coupling agent into a solvent for mixing to form a mixed solution;
adding resin and nano heat conducting particles into the mixed solution under the condition of stirring;
adding the pressure-sensitive adhesive, the auxiliary agent and the curing agent into the mixed solution in sequence;
and curing and drying the mixed solution to form the heat-conducting adhesive layer.
10. The method for preparing the thermal conductive adhesive layer according to claim 9, wherein the dispersant is one or more of a silane coupling agent or a titanate coupling agent; and/or the coupling agent is one or more of silane coupling agent and titanate coupling agent; and/or the solvent is one or more of ethyl acetate, toluene, butyl acetate and dimethyl carbonate; and/or the pressure-sensitive adhesive is an acrylic pressure-sensitive adhesive; and/or the auxiliary agent is one or more of a flatting agent, a defoaming agent and a base material wetting agent; and/or the curing agent is an isocyanate or epoxy curing agent.
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| CN202011017523.9A CN112116873B (en) | 2020-09-24 | 2020-09-24 | Rollable display device and preparation method of heat-conducting adhesive layer |
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| CN202011017523.9A CN112116873B (en) | 2020-09-24 | 2020-09-24 | Rollable display device and preparation method of heat-conducting adhesive layer |
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| CN112116873B (en) | 2022-12-23 |
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