CN115132089B - Display module and display device - Google Patents
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- CN115132089B CN115132089B CN202210841546.4A CN202210841546A CN115132089B CN 115132089 B CN115132089 B CN 115132089B CN 202210841546 A CN202210841546 A CN 202210841546A CN 115132089 B CN115132089 B CN 115132089B
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Classifications
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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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- 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
- G09F9/33—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 being semiconductor devices, e.g. diodes
- G09F9/335—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 being semiconductor devices, e.g. diodes being organic light emitting diodes [OLED]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
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- Optics & Photonics (AREA)
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Abstract
The disclosure provides a display module and a display device, belongs to the technical field of display, and discloses a display module, which comprises a support structure, a display panel and a first bonding layer for bonding the display panel and the support structure; the display module is provided with a bending area; the display module further comprises a stable structure positioned on the end face of the first bonding layer, and the stable structure at least covers the connection interface of the display panel and the first bonding layer in the bending area.
Description
Technical Field
The disclosure belongs to the technical field of display, and particularly relates to a display module and a display device.
Background
With the development of the display industry, the display device commonly used today is an organic light emitting diode display device (Organic Light Emitting Display, OLED), and great attention and development are paid to the field of display technology. The OLED is applied to a flexible display device, has wide development prospect in realizing folding, expandability, narrow frames and the like, and is also an important point for attention and development of various large-screen manufacturers and mobile phone manufacturers. The display screen is characterized in that the expansion of the display screen can be realized, so that the display switching of the small screen and the large screen is realized to meet the display requirements of consumers for different sizes. Furthermore, with reference to tablet phones, foldable and expandable screens have become the focus of recent research for comprehensive and aesthetic appeal.
The design structure of the display module with the foldable, expandable and narrow frame screen is that the display panel is adhered to a supporting structure by pressure sensitive adhesive, and the supporting structure forms a bending area and keeps radian by stamping, but the display module is thicker, so that the bending state is not easy to keep, and the bending area has a tendency of returning to be flat. Therefore, the display module and the supporting structure are easy to be peeled off in the bending area, and the part of the production process and the product reliability of the flexible display device are further affected.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art and provides a display module and a display device.
In a first aspect, embodiments of the present disclosure provide a display module, including a support structure, a display panel, and a first adhesive layer attaching the display panel and the support structure; the display module is provided with a bending area;
the display module further comprises a stable structure positioned on the end face of the first bonding layer, and the stable structure at least covers the connection interface of the display panel and the first bonding layer in the bending area.
The stable structure covers the end face of the display panel in the bending area and the end face of the first bonding layer in the bending area.
The stable structure covers the end face of the display panel in the bending area, the end face of the first bonding layer in the bending area and the connecting interface of the first bonding layer and the supporting structure in the bending area.
The stable structure covers the end face of the display panel in the bending area, the end face of the first bonding layer in the bending area and the end face of the supporting structure in the bending area.
The display panel comprises a laminated structure and cover glass which are arranged in sequence away from the supporting structure; the orthographic projection of the cover plate glass on the supporting structure coincides with the supporting structure; the front projection area of the cover glass on the supporting structure is larger than the front projection area of the laminated structure on the supporting structure.
The laminated structure comprises a protective layer, a display layer, a polarizing layer and a bonding layer; and the orthographic projection area of at least one layer of the protective layer, the polarizing layer and the adhesive layer on the supporting structure is larger than the orthographic projection area of the display layer on the supporting structure.
Wherein, the display module further comprises a flat area; the stabilizing structure comprises a first sub-stabilizing structure and a second sub-stabilizing structure;
the first sub-stable structure covers the connection interface of the display panel and the first bonding layer in the bending area;
the second sub-stabilizing structure covers the connection interface of the display panel and the first bonding layer in the flat area.
Wherein the stabilizing structure located in the bending region and the stabilizing structure located in the flat region are different in material.
Wherein the material of the stable structure is pressure sensitive adhesive.
Wherein the pressure-sensitive adhesive is made of any one of organic glass, synthetic rubber, synthetic resin, epoxy resin and organic silicon.
The elastic modulus of the first sub-stable structure is smaller than that of the second sub-stable structure.
Wherein the material of the first sub-stable structure is organic glass.
Wherein the material of the second sub-stabilizing structure is silicone.
The display panel further comprises a display area and a peripheral area; the peripheral region comprises a bonding pad region positioned at one side of the display region and the bending region positioned at one side of the bonding pad region away from the display region.
In a second aspect, an embodiment of the present disclosure provides a display device, where the display device includes any one of the display modules described above.
Drawings
FIG. 1 is a schematic end view of a display module with a bending region according to the prior art;
FIG. 2 is a schematic illustration of a prior art display panel and support structure peeled away;
FIGS. 3a-3d are schematic illustrations of a stabilizing structure provided in embodiments of the present disclosure in a inflection region;
FIGS. 4a and 4b are schematic views of a stabilization structure in a inflection region and a flat region provided in embodiments of the present disclosure;
FIG. 5 is a schematic illustration of the retraction of a laminate structure provided in an embodiment of the present disclosure;
FIG. 6 is another schematic illustration of the retraction of a laminate structure provided in an embodiment of the present disclosure;
fig. 7 is a schematic diagram of a display module provided in an embodiment of the disclosure;
fig. 8 is a schematic diagram of a display module provided in an embodiment of the disclosure after an adapter board and a flexible circuit board of the display module are turned over;
FIG. 9 is a cross-sectional view of A-A' of FIG. 8;
wherein the reference numerals are as follows: 10. a support structure; 20. a display panel; 30. a stable structure; 31. a first sub-stabilizing structure; 32. a second sub-stabilizing structure; 40. a first adhesive layer; 50. a display layer; 60. a polarizing layer; 70. a glue layer; 80. cover glass; 90. a protective layer; q1, a display area; q2, peripheral region, Q3, inflection region; q4, a flat region; COF and flip chip film adapter plate; FPC, flexible printed wiring board.
Detailed Description
The present invention will be described in further detail below with reference to the drawings and detailed description for the purpose of better understanding of the technical solution of the present invention to those skilled in the art.
Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a," "an," or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
FIG. 1 is a schematic end view of a display module with a bending region according to the prior art; FIG. 2 is a schematic illustration of a prior art display panel and support structure peeled away; as shown in fig. 1, in the prior art, a display screen, such as an expandable screen, a foldable screen, a full screen, a narrow frame screen, etc., which requires bending a partial area, the display module includes a support structure 10 and a display panel 20, and the support structure 10 and the display panel 20 are bonded by pressure sensitive adhesive. To bend the display device, the supporting structure 10 is typically bent and maintained in a curved shape by stamping, and the display panel 20 is attached to the supporting structure 10. The display panel 20 generally includes cover glass, optical cement (Optically Clear Adhesive, OCA), a polarizing layer, a display layer, and a protective layer, and has an overall thickness of 300um or more. As shown in fig. 2, since the thickness of the display panel 20 is large, after the display panel 20 is attached to the support structure 10 having the bending region Q3 only by a layer of pressure sensitive adhesive, the display panel 20 is not easily bent, and the display panel 20 and the support structure 10 may be peeled off due to the possibility of restoring the flat state. Taking a narrow-frame screen as an example, in the manufacturing process of the narrow-frame screen, in order to narrow the frame of the screen, a Pad bonding process is adopted to set a Pad area in a peripheral area of the display panel 20, which is not used for displaying, and the Pad area is bent so as to achieve the purpose of smaller frame width, if the Bending area Q3 cannot be ensured to keep Bending, not to be straight and to restore to be flat, the Pad bonding process will be affected. Therefore, the supporting structure 10 for assisting the bending of the display panel 20 and the display panel 20 are bonded and glued by only one layer of pressure-sensitive adhesive, which can lead to the bending region Q3 of the display module to be straightened and restored to be flat, and further the process of producing a part of the display module with the bending region Q3 is affected, or the reliability of the display device is reduced.
With the development of the display industry, the folding screen and the extensible screen have wide development prospect, and the comprehensive screen and the narrow frame screen are increasingly used in products such as mobile phones, tablet computers, notebook computers, various display devices and the like at present. In order to improve the reliability of the above various screens and reduce the problems that part of the process of the display device with the bending portion is seriously affected during the production process and the reliability of the final product is reduced, how to firmly attach the display panel 20 to the support structure 10 with the press bending is an urgent problem to be solved.
In view of this, the embodiment of the present disclosure provides a display module including a display panel 20 and a support structure 10 bonded by a first adhesive layer 40, and a stabilizing structure 30 is provided at an end surface of the display module in order to stably bond the display panel 20 and the support structure 10 at a bent portion to prevent peeling.
The display module of the embodiments of the present disclosure is described below with reference to the accompanying drawings and specific embodiments.
In a first aspect, an embodiment of the present disclosure provides a display module, and fig. 3a to 3d are schematic diagrams of a fixing structure provided in an embodiment of the present disclosure in a bending region; as shown in fig. 3a-3d, the display module in the present disclosure includes a support structure 10 and a display panel 20. The display panel 20 is bonded to the support structure 10 by a first adhesive layer 40 to achieve the attachment of the display panel 20 to the support structure 10. The display module in the present disclosure further includes a bending region Q3 because it is a screen that needs to be bent for a part of the area, such as an expandable screen, a foldable screen, a full-screen, and a narrow bezel screen. In order to bond and stabilize the display panel 20 and the support structure 10 at the bending region Q3 of the display module, a stabilizing structure 30 is disposed on the end surface of the first adhesive layer 40 of the display module, and the stabilizing structure 30 at least covers the connection interface between the display panel 20 and the first adhesive layer 40 at the bending region Q3. It is understood that the peeling of the display panel 20 and the support structure 10 at the bending region Q3 mainly occurs at the portion where the first adhesive layer 40 is bonded to the display panel 20, so that the fastening structure 30 at least covers the connection interface between the display panel 20 and the first adhesive layer 40 at the bending region Q3 to prevent the display panel 20 from being straightened, resulting in the possibility of peeling of the display panel 20 and the support structure 10.
In some examples, the stabilizing structure 30 covers an end surface of the display panel 20 at the bending region Q3 and an end surface of the first adhesive layer 40 at the bending region Q3. In this case, compared with the case where the stable structure 30 is covered on the connection interface between the display panel 20 and the first adhesive layer 40 at the bending region Q3, the coverage area of the stable structure 30 on the end surface of the display module is enlarged, and the display panel 20 is further prevented from being straightened, which results in the possibility that the display panel 20 and the support structure 10 are peeled off.
In some examples, the stabilizing structure 30 covers an end surface of the display panel 20 at the bending region Q3, an end surface of the first adhesive layer 40 at the bending region Q3, and a connection interface of the first adhesive layer 40 and the support structure 10 at the bending region Q3. In addition to covering the stabilizing structure 30 on the display panel 20 and the first adhesive layer 40, the stabilizing structure 30 is also covered on the connection interface between the first adhesive layer 40 and the support structure 10 in the bending area Q3, and the adhesive part between the first adhesive layer 40 and the display panel 20 is prevented from being peeled off, and at the same time, the adhesive part between the first adhesive layer 40 and the support structure 10 is prevented from being peeled off, that is, the possibility that the display panel 20 and the first adhesive layer 40 are peeled off from the support structure 10 as a whole is reduced. In this case, the coverage area of the stabilizing structure 30 on the end face of the display module is enlarged, and meanwhile, the protection range of the stabilizing structure 30 on the end face of the bending area Q3 of the display module is enlarged, so that the display panel 20 and the supporting structure 10 are prevented from being peeled off due to the alignment of the display panel 20.
In some examples, the stabilizing structure 30 covers an end surface of the display panel 20 at the bending region Q3, an end surface of the first adhesive layer 40 at the bending region Q3, and an end surface of the support structure 10 at the bending region Q3. It can be understood that the end surface of the bending region Q3 of the display module integrally covers the stabilizing structure 30, so as to reduce the possibility of peeling between the display panel 20 and the supporting structure 10 to the greatest extent.
It should be noted that, the material of the support structure 10 may be a metal material or a synthetic metal material, for example: stainless steel, in the presently disclosed embodiments, does not further limit the materials of the support structure 10.
In some examples, the material of the stabilizing structure 30 is a pressure sensitive adhesive. The pressure-sensitive adhesive is efficient and environment-friendly, has good compatibility and stability, and basically cannot be influenced by the material of an object to be bonded. The pressure-sensitive adhesive may be any one of a material of organic glass (PMMA), synthetic rubber, synthetic resin, epoxy resin, and silicone. It will be appreciated that the pressure sensitive adhesive is of a wide variety and that the particular pressure sensitive adhesive may be selected based on the particular location of the bond and the material of the bonded portion.
It should be noted that, there are various methods for forming the stabilizing structure 30 on the end surface of the display module having the bending region Q3. For example: the pressure-sensitive adhesive is applied or sprayed in a liquid state to the end face of the area of the display module where the stable structure 30 is required to be formed, and then the pressure-sensitive adhesive in a liquid state is fixed to the end face of the display module using an ultraviolet curing or thermal curing manner, thereby forming the stable structure 30 preventing the peeling of the display panel 20 and the support structure 10 of the bending region Q3 of the display module. The elastic modulus of the stable structure 30 formed by curing in this way may be greater than 500Mpa, ensuring sufficient rigidity to prevent the display panel 20 from recovering to a straightened state, resulting in peeling of the display panel 20 and the support structure 10. Other processes for forming the stabilizing structure 30 from the pressure sensitive adhesive are possible in addition to those described above. In the present disclosure, a specific process and a manufacturing method of how the pressure-sensitive adhesive forms the stable structure 30 at the end face of the display module are not further specifically limited.
In some examples, the display screen with the bending area Q3, such as a foldable screen, an expandable screen, a full-face screen, and a narrow bezel screen, has a flat area Q4 for mainly displaying functions of the display screen. Therefore, the display module further includes a flat area Q4 for mainly realizing the display function. FIGS. 4a and 4b are schematic views of a stabilization structure in a inflection region and a flat region provided in embodiments of the present disclosure; as shown in fig. 4a, 4b, the stabilizing structure 30 comprises a first sub-stabilizing structure 31 and a second sub-stabilizing structure 32. The first sub-mount structure 31 covers the connection interface of the display panel 20 and the first adhesive layer 40 at the bending region Q3, and the second sub-mount structure 32 covers the connection interface of the display panel 20 and the first adhesive layer 40 at the flat region Q4. By the method, the display panel 20 of the bending area Q3 of the display module is effectively prevented from being straightened, the possibility of stripping the display panel 20 and the supporting structure 10 is reduced, and the whole end face of the display module can be protected. The stable structure 30 is integrally covered on the end face of the display module with the bending area Q3, and the bonding area of the stable structure 30 and the end face of the display module is larger, so that the bonding is more stable. The display panel 20 has a tendency to straighten in the bending region Q3, and a certain tensile force is generated, so that the larger the bonding area between the stabilizing structure 30 and the end surface of the display module is, the more firm the bonding is, thereby more effectively resisting the tensile force generated by the straightening tendency of the bending part of the display panel 20. By the above method, the peeling of the display panel 20 and the support structure 10 due to the restoration of the display panel 20 to be straight is further prevented, so that part of the production process is affected or the reliability of the product is reduced.
Further, the first sub-stabilizing structure 31 may cover the end surface of the display panel 20 in the bending region Q3 and the end surface of the first adhesive layer 40 in the bending region Q3, and the second sub-stabilizing structure 32 may cover the end surface of the display panel 20 in the flat region Q4 and the end surface of the first adhesive layer 40 in the flat region Q4; the first sub-stabilizing structure 31 may further cover an end surface of the display panel 20 in the bending region Q3, an end surface of the first adhesive layer 40 in the bending region Q3, and a connection interface between the first adhesive layer 40 and the support structure 10 in the bending region Q3, and the second sub-stabilizing structure 32 may further cover an end surface of the display panel 20 in the flat region Q4, an end surface of the first adhesive layer 40 in the flat region Q4, and a connection interface between the first adhesive layer 40 and the support structure 10 in the flat region Q4. The first sub-stabilizing structure 31 may also cover the end surface of the display panel 20 in the bending region Q3, the end surface of the first adhesive layer 40 in the bending region Q3, and the end surface of the supporting structure 10 in the bending region Q3, and the second sub-stabilizing structure 32 may also cover the end surface of the display panel 20 in the flat region Q4, the end surface of the first adhesive layer 40 in the flat region Q4, and the end surface of the supporting structure 10 in the flat region Q4. Through the methods, the possibility that the display panel 20 of the display module is straightened in the bending area Q3 to cause the peeling of the display panel 20 and the supporting structure 10 can be reduced to the greatest extent, the end face of the display module can be protected, and the reliability of the product is improved.
In some examples, to simplify the manufacturing process flow, the materials of the first sub-stabilizing structure 31 and the second sub-stabilizing structure 32 are the same. The first sub-stabilizing structure 31 and the second sub-stabilizing structure 32 may be any type of pressure sensitive adhesive material. In the manufacturing process, the end face of the display module having the bending region Q3 is entirely coated or sprayed with a pressure-sensitive adhesive material, and the pressure-sensitive adhesive is formed into the stable structure 30 by ultraviolet curing or thermal curing. It is understood that other process means may be used to integrally provide the stabilizing structure 30 on the end face of the display module having the bending region Q3, and the specific process means are not further limited in this disclosure.
Further, the stabilizing structure 30 may be disposed on four end surfaces of the display module, that is, two end surfaces without the bending region Q3 and two end surfaces with the bending region Q3. By the method, the stable structure 30 can prevent the display panel 20 from being straightened in the bending area Q3, so that the display panel 20 and the supporting structure 10 can be peeled off, and the peripheral end face of the display module can be protected, so that the finally produced display device has higher reliability.
In some examples, the materials of the first and second sub-stabilizing structures 31, 32 are different. Since the stabilizing structures 30 located in the bending region Q3 of the display module and the flat region Q4 of the display module have different functions, the tensile force to be borne and the toughness to be borne are different, so that the first sub-stabilizing structure 31 and the second sub-stabilizing structure 32 can better exert their functions, and the first sub-stabilizing structure 31 and the second sub-stabilizing structure 32 are made of different materials.
In some examples, the modulus of elasticity of the first sub-stabilizing structure 31 is less than the modulus of elasticity of the second sub-stabilizing structure 32. The first sub-stabilizing structure 31 located in the bending region Q3 of the display module is mainly used for preventing the display panel 20 from being straightened to make the display surface and the supporting structure 10 separate. The second sub-stabilizing structure 32 located in the flat area Q4 of the display module can provide protection for the entire end surface of the display module, and improve the reliability of the product.
Further, in order to better enable the first sub-stable structure 31 and the second sub-stable structure 32 to perform their functions, the first sub-stable structure 31 may be made of organic glass (PMMA), i.e. polymethyl methacrylate; the second stabilizing structure 30 may be silicone. The organic glass material is also called acrylic, has good weather resistance, little influence of temperature difference change on the organic glass material, and good ageing resistance, is easy to process in production and manufacture, and can change shape through mechanical equipment or mold various shapes through a thermoforming mode. The organic silicon material has excellent characteristics of high and low temperature resistance, electrical insulation, oxidation resistance stability, weather resistance, corrosion resistance and the like. In order to effectively stabilize the display panel 20 and prevent it from straightening and restoring to be flat, the organic glass used for the first sub-stabilizing structure 31 needs to have an elastic modulus greater than 100Mpa for the first sub-stabilizing structure 31 located in the bending region Q3 of the display module, so as to ensure sufficient rigidity, and prevent the display panel 20 from straightening and peeling off the display panel 20 and the supporting structure 10. In order to prevent the first sub-fixing structure 31 from being partially or completely separated from the display module bending region Q3 due to the tensile force of the display panel 20 caused by the straight trend, the adhesion force of the first sub-fixing structure 31 needs to be above 5B. The silicone used for the second sub-stabilizing structure 32 has an elastic modulus of less than 500Mpa, and when the display module with the bending region Q3 is used for the expandable screen, the flat region Q4 thereof can be used for the expandable region, so that the maximum elastic modulus thereof is controlled to ensure the normal use of the expandable screen.
In some examples, fig. 5 is a schematic illustration of a retraction of a laminate structure provided in an embodiment of the present disclosure; FIG. 6 is another schematic illustration of the retraction of a laminate structure provided in an embodiment of the present disclosure; as shown in fig. 5 and 6, the display panel 20 of the display module includes a laminated structure and a cover glass 80 disposed in sequence away from the support structure 10; the cover glass 80 is positioned in the orthographic projection of the support structure 10 and coincides with the support structure 10; the cover glass 80 is positioned at the front projection area of the support structure 10 greater than the front projection area of the laminated structure at the support structure 10. In the display panel 20, the laminated structure includes a protective layer 90, a display layer 40, a polarizing layer 60, and an adhesive layer 70. In order to make the coverage area of the end surfaces of the stabilizing structure 30 and the display panel 20 located in the bending area Q3 larger, so as to improve the stabilizing effect of the stabilizing structure 30 on the end surface of the bending area Q3 of the display module, at least one of the protective layer 90, the polarizing layer 60 and the adhesive layer 70 of the laminated structure is located in the front projection area of the supporting structure 10 and is larger than the front projection area of the display layer 40 located in the supporting structure. It can be understood that the partial structure of the display panel 20 is contracted to increase the glue coating amount of the pressure-sensitive adhesive on the end surface of the bending area Q3 of the display module, thereby increasing the coverage area of the stable structure 30 on the end surface of the bending area Q3 of the display module. By the method, the stable structure 30 can be prevented from being peeled off by the adhesive between the display panel 20 and the supporting structure 10 more reliably, and the stable structure 30 can be prevented from being peeled off from the end face of the bending area Q3 of the display module.
It should be noted that, the cover glass 80 may be an ultrathin glass or a transparent material, the adhesive layer 70 may be a material such as an optical adhesive (Optically Clear Adhesive, OCA), and the protective layer 90 may be a material such as a polyimide film, a synthetic rubber, and a synthetic resin, and the materials of the cover glass 80, the adhesive layer 70, and the protective layer 90 are not further limited in the embodiments of the present disclosure.
In some examples, in one embodiment of partial layer structure adduction of the laminated structure of the display panel 20 of the display module, as shown in fig. 5, the adhesive layer 70 and the display layer 40 are retracted toward the center of the screen compared to the polarizing layer 60 and the protective layer 90, the front projection of the cover glass 80 on the support structure 10 coincides with the support structure 10, the front projection of the adhesive layer 70 and the display layer 40 on the support structure 10 coincides, and the front projection of the polarizing layer 60 and the protective layer 90 on the support structure 10 coincides. The distance between two opposite sides of the display module with the bending area Q3 is taken as the width. Accordingly, the distance between the support structure 10 and the display panel 20, and between the cover glass 80 and the laminate structure in the display panel 20, which have two opposite sides with the bending region Q3, is the width. The forward projection width of the polarizing layer 60 and the protective layer 90 on the support structure 10 is greater than the forward projection width of the adhesive layer 70 and the display layer 40 on the support structure 10. The two sides of the glue layer 70 and the display layer 40 with the bending zone Q3 are spaced apart from the two sides of the cover glass 80 and the support structure 10 by a distance D1, wherein the value of D1 is between 100 and 1000 um. The distance between the two sides of the polarizing layer 60 and the protective layer 90 with the bending region Q3 and the two sides of the cover glass 80 and the support structure 10 is D2, wherein the value of D2 is between 50 and 500 um. By the method of shrinking the lamination structure portion in the display panel 20, the glue spreading amount is increased, the bondable area between the stabilizing structure 30 and the end face of the display module is increased, and the adhesion force of the stabilizing structure 30 on the end face of the display module and the stabilizing effect thereof are improved.
In some examples, another embodiment of partial layer structure adduction of the laminated structure of the display panel 20 of the display module, as shown in fig. 6, the polarizing layer 60 and the display layer 40 are retracted toward the center of the screen compared to the adhesive layer 70 and the protective layer 90, the front projection of the cover glass 80 on the support structure 10 coincides with the support structure 10, and the adhesive layer 70 and the protective layer 90 on the support structure 10 coincide. The distance between two opposite sides of the display module with the bending area Q3 is taken as the width. Accordingly, the distance between the support structure 10 and the display panel 20, and between the cover glass 80 and the laminate structure in the display panel 20, which have two opposite sides with the bending region Q3, is the width. The forward projection width of the glue layer 70 and the protective layer 90 on the support structure 10 is larger than the forward projection width of the polarizing layer 60 on the support structure 10. The forward projection width of polarizing layer 60 on support structure 10 is greater than the forward projection width of display layer 40 on support structure 10. By the method of shrinking the lamination structure portion in the display panel 20, the glue spreading amount is increased, the bondable area between the stabilizing structure 30 and the end face of the display module is increased, and the adhesion force of the stabilizing structure 30 on the end face of the display module and the stabilizing effect thereof are improved. Meanwhile, through the above-mentioned shrinking-in manner, the bonding area of the cover glass 80 and the laminated structure is ensured without excessive shrinking-in bonding layer 70, so that the bonding quality is not affected.
In some examples, fig. 7 is a schematic diagram of a display module provided in an embodiment of the disclosure; fig. 8 is a schematic diagram of a display module provided in an embodiment of the disclosure after an adapter board and a flexible circuit board of the display module are turned over; FIG. 9 is a cross-sectional view of A-A' of FIG. 8; as shown in fig. 7-9, the display module further generally includes an interposer and a flexible printed circuit board FPC, where in the embodiment of the present disclosure, the interposer includes, but is not limited to, a flip-chip film interposer COF, but due to the flexible property of the flip-chip film interposer COF, the flip-chip film interposer COF is convenient to fold, and scratches on the display module can be reduced. The display panel 20 further includes a display region Q1 and a peripheral region Q2, and the peripheral region Q2 includes a pad region located at a side of the display region Q1 and a bent region Q3 located at a side of the pad region remote from the display region Q1.
Further, the COF of the flip chip film interposer is soldered to the pad area of the display panel 20 to realize connection, and the FPC is connected to the COF of the flip chip film interposer to realize electrical connection between the FPC and the display panel 20. After the connection is completed, the COF and FPC are required to be folded to the back side of the display module, and the side, away from the display panel 20, of the support structure 10 is the back side of the display module. On the screen excluding the bending area Q3, the COF of the flip chip film adapter and the FPC are directly folded to the back of the display module, and as the flip chip film adapter is not provided with radians, the COF part of the flip chip film adapter needs to be folded to be close to 180 degrees to be completely folded to the back of the display module and attached, so that the welding quality of the COF of the flip chip film adapter and the bonding pad area of the display panel 20 can be affected, the COF of the flip chip film adapter and the welding part of the display panel 20 are pulled, the welding part falls off, and the normal work of the FPC in the display module is affected. In the present disclosure, the bending area Q3 is added on the side of the pad area away from the display area Q1, when the flip chip film adapter COF and the flexible printed circuit board FPC are folded to the side of the support structure 10 away from the display panel 20, because the flip chip film transistor is partially in the bending area Q3 of the display panel 20, the flip chip film adapter COF has a certain radian, the traction force applied to each welding part of the folded pad area is reduced, and the possibility of the flip chip film adapter COF being detached from the display panel 20 is reduced.
It should be noted that the area where the bending area Q3 of the different types of screens is located may be different, for example, a foldable screen, where the bending area Q3 passes through the display area Q1 of the display module. And a part of narrow frame screen, wherein a bending region Q3 is positioned in a peripheral region Q2, and a bonding pad region is positioned on one side of the bending region Q3 far away from a display region Q1. Some screens have two bending areas Q3, are located at the edges of the display module and are arranged oppositely, so that the display of the narrow-frame full screen is realized. The embodiments provided in the present disclosure are limited to the case of only including the interposer and the FPC, and the bending region Q3 may be located at other positions in different types of screens, which is not further limited herein.
In a second aspect, an embodiment of the present disclosure further provides a display device, which includes any of the display modules described above. The display device can be any one of an expandable screen, a foldable screen, a full screen, a narrow frame screen and the like which need to partially fold the display module. Through setting up stable structure 30 to the terminal surface of display module assembly, improved the reliability of display module assembly, also improved the reliability of the display device who uses this kind of display module assembly simultaneously.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.
Claims (15)
1. A display module comprises a support structure, a display panel and a first bonding layer for bonding the display panel and the support structure; the display module is provided with a bending area;
the display module further comprises a stable structure positioned on the end face of the first bonding layer, and the stable structure at least covers the connection interface of the display panel and the first bonding layer in the bending area.
2. The display module of claim 1, wherein the stabilizing structure covers an end surface of the display panel at the bending region and an end surface of the first adhesive layer at the bending region.
3. The display module of claim 1, wherein the stabilizing structure covers an end surface of the display panel at the bending region, an end surface of the first adhesive layer at the bending region, and a connection interface of the first adhesive layer and the support structure at the bending region.
4. The display module of claim 1, wherein the stabilizing structure covers an end surface of the display panel at the bending region, an end surface of the first adhesive layer at the bending region, and an end surface of the support structure at the bending region.
5. The display module of claim 1, wherein the display panel comprises a laminated structure and a cover glass disposed in sequence away from the support structure; the orthographic projection of the cover plate glass on the supporting structure coincides with the supporting structure; the front projection area of the cover glass on the supporting structure is larger than the front projection area of the laminated structure on the supporting structure.
6. The display module of claim 5, wherein the laminate structure comprises a protective layer, a display layer, a polarizing layer, and a glue layer; and the orthographic projection area of at least one layer of the protective layer, the polarizing layer and the adhesive layer on the supporting structure is larger than the orthographic projection area of the display layer on the supporting structure.
7. The display module of claim 1, wherein the display module further comprises a flat region; the stabilizing structure comprises a first sub-stabilizing structure and a second sub-stabilizing structure;
the first sub-stable structure covers the connection interface of the display panel and the first bonding layer in the bending area;
the second sub-stabilizing structure covers the connection interface of the display panel and the first bonding layer in the flat area.
8. The display module of claim 7, wherein the first sub-stabilizing structure and the second sub-stabilizing structure are of different materials.
9. The display module of claim 1, wherein the material of the stabilizing structure is a pressure sensitive adhesive.
10. The display module of claim 9, wherein the pressure sensitive adhesive is any one of a plexiglass, a synthetic rubber, a synthetic resin, an epoxy resin and a silicone.
11. The display module of claim 7, wherein the first sub-mount structure has a modulus of elasticity that is less than a modulus of elasticity of the second sub-mount structure.
12. The display module of claim 11, wherein the material of the first sub-mount structure is plexiglass.
13. The display module of claim 11, wherein the material of the second sub-mount structure is silicone.
14. The display module of claim 1, wherein the display panel further comprises a display area and a peripheral area; the peripheral region comprises a bonding pad region positioned at one side of the display region and the bending region positioned at one side of the bonding pad region away from the display region.
15. A display device, characterized in that the display device comprises the display module of any one of claims 1-14.
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| KR20190070740A (en) * | 2017-12-13 | 2019-06-21 | 엘지디스플레이 주식회사 | Foldable display device |
| CN114550589A (en) * | 2022-02-22 | 2022-05-27 | 武汉天马微电子有限公司 | Display module and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20190070740A (en) * | 2017-12-13 | 2019-06-21 | 엘지디스플레이 주식회사 | Foldable display device |
| CN114550589A (en) * | 2022-02-22 | 2022-05-27 | 武汉天马微电子有限公司 | Display module and display device |
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