CN210722206U - Folding display screen and display device - Google Patents
Folding display screen and display device Download PDFInfo
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- CN210722206U CN210722206U CN201921098718.3U CN201921098718U CN210722206U CN 210722206 U CN210722206 U CN 210722206U CN 201921098718 U CN201921098718 U CN 201921098718U CN 210722206 U CN210722206 U CN 210722206U
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Abstract
The utility model provides a folding display screen and display device, this folding display screen include the bending zone, and the bending zone includes first inorganic rete, and the material of first inorganic rete is the magnetostrictive material. The first inorganic film layer in the folding display screen is formed by using the magnetostrictive material, so that the problem that folds are easy to appear after the folding display screen is frequently bent in the prior art is solved.
Description
Technical Field
The utility model relates to a folding display product technical field, concretely relates to folding display screen and display device.
Background
With the development of flexible display technology, foldable display screens have come along. The folded display is usually a multi-layer structure, and some layers cannot be fully restored after being frequently bent under stress, in which case, when the folded display is unfolded and displayed, wrinkles may appear at the position of the fold.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the utility model provides a provide a folding display screen and display device to solve among the prior art folding display screen and frequently buckle the problem that the fold easily appears after.
The utility model discloses the first aspect provides a folding display screen, including folding district, folding district includes first inorganic rete, and the material of first inorganic rete is the magnetostrictive material. The first inorganic film layer in the folding display screen is formed by using the magnetostrictive material, so that the problem that folds are easy to appear after the folding display screen is frequently bent in the prior art is solved.
In one embodiment, the first inorganic film layer includes a first inorganic sub-film layer and a second inorganic sub-film layer, the first inorganic sub-film layer is made of a negative magnetostrictive material, the first inorganic sub-film layer is located in a folding direction of a folding neutral layer of the folding display screen, the second inorganic sub-film layer is made of a positive magnetostrictive material, and the second inorganic sub-film layer is located in a folding reverse direction of the folding neutral layer. The first inorganic film layer formed by the negative magnetostrictive material is arranged in the folding direction of the folding neutral layer, the second inorganic film layer formed by the positive magnetostrictive material is arranged in the reverse folding direction of the folding neutral layer, the structure is arranged to be adaptive to the stress condition of each film layer in the folding display screen during bending, and the probability of folds of the folding display screen is reduced to the greatest extent.
In one embodiment, the folding area further includes an organic film layer, the organic film layer and the first inorganic film layer being stacked; and/or the folding area further comprises a second inorganic film layer, the second inorganic film layer is made of silicide, and the first inorganic film layer and the second inorganic film layer are overlapped. By superposing the first inorganic film layer and the organic film layer formed by the magnetostrictive material, the obtained combined film layer has the water and oxygen barrier function, and can avoid wrinkles caused by frequent bending.
In one embodiment, the first inorganic film layer is a grid-like structure. The grid structure can buffer folding stress, and a first inorganic film layer formed by magnetostrictive materials is set to be the grid structure, so that wrinkles caused by frequent bending can be further avoided.
In one embodiment, the mesh of the lattice-like structure is filled with one or more of silicon nitride, silicon oxide, magnesium oxide, aluminum oxide. By filling silicon nitride, silicon oxide, magnesium oxide or aluminum oxide in the meshes of the first inorganic film layer, the water-oxygen barrier capability and the insulating property of the whole film layer can be improved.
In one embodiment, the folding display screen further comprises a non-folding area except the folding area, the first inorganic film layer is a whole-layer structure located in the folding area and the non-folding area, and orthographic projections of pixel units in the folding display screen on the first inorganic film layer fall into meshes of the grid-shaped structure. Therefore, the first inorganic film layer can be prevented from shielding the emergent light of the pixel unit, and the folding display screen is ensured to have a good display effect.
In one embodiment, the magnetostrictive material comprises at least one of metallic nickel and alloys thereof, iron alloys, ferrite magnetostrictive materials, rare earth intermetallic magnetostrictive materials.
In one embodiment, the first inorganic film layer is a transparent film layer. Avoiding shielding the pixel luminescence and ensuring good display effect.
A second aspect of the present invention provides a foldable display device, comprising; the foldable display screen provided by any of the above embodiments; and an electromagnetic control unit for generating a magnetic field perpendicular to the folding line of the folding display screen.
In one embodiment, the electromagnetic control unit includes a fixed shaft fixed to the folding display screen and an electromagnetic coil wound around the fixed shaft, the axis of the fixed shaft being parallel to the folding line. The fixed shaft and the electromagnetic coil are used for forming the electromagnetic control unit, so that the structure is simple, and the industrial implementation is facilitated.
According to the utility model provides a folding display screen and folding display device utilize the magnetostrictive material to form first inorganic rete in folding district. When an external magnetic field is applied around the folding display screen, the magnetostrictive material can cause the Young's modulus to change due to the change of the magnetization state of the magnetostrictive material, so that the first inorganic film layer is stretched or shortened. In this case, along with the folding of the folding display screen, the first inorganic film layer can be completely recovered after being stretched or shortened, and the problem of wrinkles caused by frequent folding is avoided.
Drawings
Fig. 1a is a schematic structural diagram of a foldable display screen according to an embodiment of the present invention.
Fig. 1b is a schematic structural view of the folded display screen shown in fig. 1a according to an embodiment of the present invention after being folded.
Fig. 2 is a schematic structural diagram of a functional layer in a foldable display screen according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a functional layer in a foldable display screen according to another embodiment of the present invention.
Fig. 4 is a schematic structural diagram of an inorganic layer according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a foldable display screen according to another embodiment of the present invention.
Fig. 6 is a block diagram of a foldable display device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Fig. 1a is a schematic structural diagram of a foldable display screen according to an embodiment of the present invention. As shown in fig. 1a, the foldable display 10 includes functional layers, the functional layers include a first inorganic film layer 100, the material of the first inorganic film layer 100 is a magnetostrictive material, that is, the foldable display 10 includes a folding region and a non-folding region except the folding region, and the first inorganic film layer is an entire layer structure located in both the folding region and the non-folding region.
The functional layer refers to a hierarchical structure formed of a plurality of film layers and having a certain function. Each functional layer comprises a plurality of film layers which are sequentially superposed, and the plurality of film layers which are sequentially superposed are combined to play a certain function by reasonably selecting the materials of the plurality of film layers and setting the patterns of the film layers to form one functional layer.
Specifically, as shown in fig. 1a, the foldable display screen 10 includes four functional layers, including a buffer layer 12, a driving unit array layer 13, a light emitting unit array layer 14, and an encapsulation layer 15, which are sequentially stacked on a flexible substrate 11 from bottom to top. In one embodiment, the driving unit array layer 13 is a thin film transistor array layer, and includes a channel layer, a gate insulating layer, a gate electrode, an interlayer dielectric layer, a source electrode, and a drain electrode, which are stacked in sequence from bottom to top, and the gate insulating layer and the interlayer dielectric layer may include one or more film layers. The light emitting unit array layer 14 is an organic light emitting diode array layer, and includes a cathode layer, an organic light emitting layer, and an anode layer, which are sequentially stacked from bottom to top. At least one of the buffer layer 12, the driving unit array layer 13, and the encapsulation layer 15 includes a first inorganic film layer 100 formed of a magnetostrictive material.
Magnetostrictive materials are inorganic materials with magnetostrictive properties. Under the action of the external magnetic field, the dimension of the magnetostrictive material along the direction of the external magnetic field can be elongated or shortened. Magnetostrictive materials include metallic nickel and its alloys such as nickel-cobalt alloy, nickel-cobalt-chromium alloy, etc.; iron alloys such as iron-nickel alloy, iron-aluminum alloy, iron-cobalt-vanadium alloy, and the like; and ferrite magnetostrictive materials or rare earth intermetallic compound magnetostrictive materials and the like.
In one embodiment, the first inorganic film layer 100 is a transparent film layer. Therefore, the pixel units can be prevented from being shielded, and the folding display screen 10 is ensured to have good display effect.
According to the foldable display screen 10 provided by the embodiment, the first inorganic film layer 100 is formed by using a magnetostrictive material, and when an external magnetic field is applied around the foldable display screen 10, the magnetostrictive material can cause a change in its own young's modulus of elasticity due to a change in its magnetization state, so that the first inorganic film layer 100 is stretched or shortened. In this case, the first inorganic film layer 100 may be completely recovered after being extended or shortened along with the bending of the foldable display screen 10, thereby avoiding the problem of the wrinkles of the first inorganic film layer 100 caused by frequent bending.
Fig. 1b is a schematic structural view of the folded display screen shown in fig. 1a according to an embodiment of the present invention after being folded. For ease of description, FIG. 1b only shows a portion of the layers of FIG. 1 a. Referring to fig. 1a and 1b, the first inorganic film layer 100 includes a first sub inorganic film layer 110 and a second sub inorganic film layer 120, the first sub inorganic film layer 110 is made of a negative magnetostrictive material, the first sub inorganic film layer 110 is located in a folding direction of the neutral folding layer 130 of the foldable display panel 10, for example, in a Z direction shown in fig. 1b, the second sub inorganic film layer 120 is made of a positive magnetostrictive material, and the second sub inorganic film layer 120 is located in a folding direction of the neutral folding layer 130. The folding direction is relative to the folding direction, i.e. the direction opposite to the folding direction.
After the foldable display screen 10 is bent under stress, the membrane layer that is not stressed in the bending region is the foldable neutral layer 130, the membrane layer in the folding direction of the foldable neutral layer 130 is under compressive stress, and the membrane layer in the opposite folding direction of the foldable neutral layer 130 is under tensile stress. For example, as shown in fig. 1a and 1b, after the foldable display screen 10 is bent, the light emitting unit array layer 14 is a folding neutral layer, the flexible substrate 11, the buffer layer 12 and the driving unit array layer 13 are subjected to compressive stress, and the encapsulation layer 15 is subjected to tensile stress.
Magnetostrictive materials can be classified into positive magnetostrictive materials and negative magnetostrictive materials according to the deformation characteristics. The positive magnetostriction material is a material which is elongated along the dimension in the direction of an external magnetic field under the action of the external magnetic field, and comprises TbFe2、Tb(CoFe)2、Tb(NiFe)2、TbFe3And the like. The negative magnetostriction material refers to a material with a shortened size along the direction of an external magnetic field under the action of the external magnetic field, and comprises NiFe2O4、CoFeO4And the like. Based on this, in the folding direction of the fold neutral layer 130, the first sub inorganic film layer 110 formed of a negative magnetostrictive material is disposed, and in the reverse direction of the folding of the fold neutral layer 130, the first sub inorganic film layer 110 formed of a positive magnetostrictive material is disposedThe second inorganic sub-film 130 is configured to be capable of adapting to the stress condition of the foldable display screen 10 when being bent, so as to avoid the foldable display screen 10 from being wrinkled to the greatest extent.
Fig. 2 is a schematic structural diagram of a functional layer in a foldable display screen according to an embodiment of the present invention. As shown in fig. 2, the functional layer 20 includes a first inorganic film layer 21 and an organic film layer 22 stacked, and the functional layer 20 is used for blocking water and oxygen, and may be used as the buffer layer 12 and the encapsulation layer 15 of the foldable display 10 shown in fig. 1 a.
The organic film layer 22 has good film-forming properties, uniformity and surface flatness. The material of the organic film layer 22 is a polymer, such as polyimide, polyethylene, polypropylene, polystyrene, etc. The first inorganic film layer 21 has a good barrier effect against water vapor and oxygen. The organic film layer 22 and the first inorganic film layer 21 are complementary in performance and have good water and oxygen barrier ability after being stacked.
In one embodiment, the functional layer 20 is a multi-film structure in which the first inorganic film layers 21 and the organic film layers 22 are alternately stacked. In this way, the water oxygen barrier ability of the functional layer 20 can be further improved.
In one embodiment, as shown in fig. 2, the functional layer 20 is a "sandwich" structure, with an organic film 22 in the middle and a first inorganic film 21 on each side. In one embodiment, the functional layer 20 is a four-film structure in which the organic film layer 22 and the first inorganic film layer 21 are alternately stacked.
According to the functional layer 20 provided by the embodiment, the water and oxygen barrier capability is good, and meanwhile, wrinkles caused by frequent bending can be avoided.
Fig. 3 is a schematic structural diagram of a functional layer in a foldable display screen according to another embodiment of the present invention. As shown in fig. 3, the functional layer 30 includes a first inorganic film layer 31 and a second inorganic film layer 32 stacked. The first inorganic film 31 is made of a magnetostrictive material, and the second inorganic film 32 is made of a silicide, including silicon nitride or silicon oxide. The functional layer 20 is used for interlayer insulation, and can be used as a gate insulation layer and an interlayer dielectric layer in the driving unit array layer 13 of the foldable display screen 10 shown in fig. 1 a.
The functional layer 30 provided by the embodiment has good insulating performance, and can avoid wrinkles caused by frequent bending.
Fig. 4 is a schematic structural diagram of a first inorganic layer according to an embodiment of the present invention. As shown in fig. 4, the first inorganic film 40 has a grid structure, and the material forming the first inorganic film 40 is a magnetostrictive material.
The first inorganic film layer 40 of the grid-like structure includes network connection lines 41 and meshes 42 surrounded by the network connection lines 41. The magnetostrictive material is used for forming the network connecting lines 41, and the meshes 42 are hollowed out or filled with other materials. The shape of the mesh openings 42 may be regular, such as rectangular, diamond, circular, etc., or irregular. The shape of the different meshes may be the same or different.
The grid-like structure itself has good stress relief capability. Therefore, by providing the first inorganic film layer 40 with a grid-like structure, wrinkles caused by frequent bending can be further avoided.
In one embodiment, the orthographic projection of the pixel cells in the folded display screen on the first inorganic film layer 40 falls into the mesh 42 of the first inorganic film layer 40. In this case, even if the magnetostrictive material forming the first inorganic film layer 40 is opaque, the pixel unit is not shielded.
In one embodiment, the mesh 42 of the first inorganic film layer 40 is filled with one or more of silicon nitride, silicon oxide, aluminum oxide, and magnesium oxide. In this case, the deterioration of the function of the film layer due to the mesh-like structure can be avoided. For example, when the first inorganic film layer 40 is used to form an encapsulation layer, the mesh-like structure does not affect the moisture and oxygen barrier effect, thereby ensuring the encapsulation effect.
Fig. 5 is a schematic structural diagram of a foldable display screen according to another embodiment of the present invention. As shown in fig. 5, the foldable display screen 50 is different from the foldable display screen 10 shown in fig. 1 only in that in the foldable display screen 50, the first inorganic film layer 500 is not an entire layer structure, but is located only in the folding region Q of the foldable display screen 50.
Specifically, the folded display screen 50 includes a folding region Q including four functional layers, including a buffer layer 52, a driving unit array layer 53, a light emitting unit array layer 54, and an encapsulation layer 55, which are sequentially stacked on the flexible substrate 51 from bottom to top. The driving unit array layer 53 includes a gate insulating layer, an interlayer dielectric layer, and an interlayer planarization layer, which are sequentially stacked from bottom to top, and the gate insulating layer and the interlayer dielectric layer include at least one film layer.
In one embodiment, as shown in fig. 5, the buffer layer 52 includes a first organic film layer, a first sub inorganic film layer 510, a second organic film layer, and a second sub inorganic film layer 520, which are sequentially stacked on the flexible substrate 51.
In one embodiment, the driving cell array layer 53 includes a third sub inorganic film layer 530, a fourth sub inorganic film layer 540, and an interlayer planarization layer, which are sequentially stacked on the buffer layer 52.
In one embodiment, the encapsulation layer 55 includes a fifth sub inorganic film layer 550, a third organic film layer, and a sixth sub inorganic film layer 560 sequentially stacked on the light emitting cell array layer 54.
The first sub inorganic film layer 510, the second sub inorganic film layer 520, the third sub inorganic film layer 530, the fourth sub inorganic film layer 540, the fifth sub inorganic film layer 550 and the sixth sub inorganic film layer 560 are all made of magnetostrictive materials. The materials of the first organic film layer, the second organic film layer and the third organic film layer are the same or different. The references to "first", "second", "third", "fourth", "fifth" and "sixth" herein are only for the purpose of clearly illustrating the technical solutions, and are not intended to limit the scope of the present invention.
Fig. 6 is a block diagram of a foldable display device according to an embodiment of the present invention. As shown in fig. 6, the folding display device 60 includes a folding display screen 61 and an electromagnetic control unit 62 provided in any of the above embodiments. The electromagnetic control unit 62 is used to generate a magnetic field perpendicular to the folding line of the folding display screen 61.
The folding line of the folding display 61 refers to a crease when the folding display is bent. By generating a magnetic field perpendicular to the folding line by using the electromagnetic control unit 62, the first inorganic film layer in the foldable display screen 61 is extended or contracted in the direction of the magnetic field, i.e., in the direction perpendicular to the folding line, so as to prevent the foldable display screen 61 from being wrinkled.
In one embodiment, the electromagnetic control unit 62 includes a fixing shaft 621 fixed on the folding display screen and an electromagnetic coil 622 wound on the fixing shaft 621, and the axis of the fixing shaft 621 is parallel to the folding line. The electromagnetic control unit 62 is formed by the fixed shaft 621 and the electromagnetic coil 622, and is simple in structure and low in cost.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalents and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. The folding display screen is characterized by comprising a folding area, wherein the folding area comprises a first inorganic film layer, the first inorganic film layer is made of magnetostrictive materials, and the first inorganic film layer is of a grid-shaped structure.
2. The foldable display screen of claim 1, wherein the first inorganic film layer comprises a first sub inorganic film layer and a second sub inorganic film layer, the first sub inorganic film layer is made of a negative magnetostrictive material, the first sub inorganic film layer is located in a folding direction of a folding neutral layer of the foldable display screen, the second sub inorganic film layer is made of a positive magnetostrictive material, and the second sub inorganic film layer is located in a folding reverse direction of the folding neutral layer.
3. The folding display of claim 1, wherein the folding area further comprises an organic film layer, the organic film layer and the first inorganic film layer being stacked; and/or
The folding area further comprises a second inorganic film layer, the second inorganic film layer is made of silicide, and the first inorganic film layer and the second inorganic film layer are overlapped.
4. The foldable display screen of claim 1, wherein the mesh of the grid-like structure is filled with any one of silicon nitride, silicon oxide, magnesium oxide, and aluminum oxide.
5. A foldable display screen according to claim 1, further comprising a non-folding area other than the folding area, wherein the first inorganic film layer is an entire layer structure located in the folding area and the non-folding area, and wherein orthographic projections of pixel units in the foldable display screen on the first inorganic film layer fall into meshes of the grid-like structure.
6. The foldable display screen of claim 1, wherein the magnetostrictive material comprises any of metallic nickel and its alloys, iron alloys, ferrite magnetostrictive materials, rare earth intermetallic magnetostrictive materials.
7. The foldable display screen of claim 1, wherein the first inorganic film layer is a transparent film layer.
8. A foldable display device, comprising;
the foldable display of any one of claims 1-7; and
and the electromagnetic control unit is used for generating a magnetic field perpendicular to the folding line of the folding display screen.
9. The folding display device of claim 8, wherein said electromagnetic control unit includes a fixed shaft fixed to said folding display screen and an electromagnetic coil wound around said fixed shaft, an axis of said fixed shaft being parallel to said folding line.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921098718.3U CN210722206U (en) | 2019-07-12 | 2019-07-12 | Folding display screen and display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921098718.3U CN210722206U (en) | 2019-07-12 | 2019-07-12 | Folding display screen and display device |
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| CN210722206U true CN210722206U (en) | 2020-06-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112365804A (en) * | 2020-11-26 | 2021-02-12 | 武汉天马微电子有限公司 | Display module and display device |
| CN112396963A (en) * | 2020-11-16 | 2021-02-23 | 武汉华星光电半导体显示技术有限公司 | Foldable display module and device |
-
2019
- 2019-07-12 CN CN201921098718.3U patent/CN210722206U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112396963A (en) * | 2020-11-16 | 2021-02-23 | 武汉华星光电半导体显示技术有限公司 | Foldable display module and device |
| CN112365804A (en) * | 2020-11-26 | 2021-02-12 | 武汉天马微电子有限公司 | Display module and display device |
| CN112365804B (en) * | 2020-11-26 | 2022-11-22 | 武汉天马微电子有限公司 | Display module and display device |
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