CN110634396A - Display panel - Google Patents
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- CN110634396A CN110634396A CN201910759998.6A CN201910759998A CN110634396A CN 110634396 A CN110634396 A CN 110634396A CN 201910759998 A CN201910759998 A CN 201910759998A CN 110634396 A CN110634396 A CN 110634396A
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- protective film
- display panel
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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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- 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
- Y02E10/549—Organic PV cells
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The embodiment of the invention relates to the technical field of foldable display and discloses a display panel. In the present invention, a display panel includes: the display device includes a foldable display layer, a first protective film on the display layer, and a second protective film on the first protective film, the first protective film having a higher elastic coefficient than the second protective film, the second protective film having a higher elongation than the first protective film. The display panel provided by the invention can effectively protect the display panel and prolong the service life.
Description
Technical Field
The embodiment of the invention relates to the technical field of foldable display, in particular to a display panel.
Background
Along with the development of science and technology, the application of flat panel display device is more and more extensive, and people also are higher and higher to flat panel display device, and to flat panel display device, big screen display shows in order to improve visual experience and miniaturized so that carry all is people's growing demand, in order to satisfy big screen display simultaneously and equipment miniaturization, but foldable display device comes about.
The inventor finds that at least the following problems exist in the prior art: once the foldable display device falls or collides, the display panel is likely to be damaged, and the service life of the display panel is affected.
Disclosure of Invention
The invention aims to provide a display panel, which can effectively protect the display panel and prolong the service life.
To solve the above technical problem, an embodiment of the present invention provides a display panel including: the display device includes a foldable display layer, a first protective film on the display layer, and a second protective film on the first protective film, the first protective film having a higher elastic coefficient than the second protective film, the second protective film having a higher elongation than the first protective film.
Compared with the prior art, the embodiment of the invention can apply compressive stress to the first protection film because the elastic coefficient of the first protection film is higher than that of the second protection film, and can apply tensile stress to the second protection film because the elongation of the second protection film is higher than that of the first protection film, so that the first protection film can be extruded due to bending and the second protection film can be stretched due to bending in the process of folding the display panel, thereby better releasing the compressive stress at the inner side and the tensile stress at the outer side of the bending part, avoiding the problem that the display panel is difficult to fold due to overlarge compressive stress or overlarge tensile stress, effectively protecting the foldable display panel and prolonging the service life.
The first protective film and the second protective film are made of the same material, and the density of the second protective film is higher than that of the first protective film.
In addition, the display layer includes a front surface for displaying an image, and a back surface opposite to the front surface, the first protective film being on the back surface; preferably, the display panel further includes a third protective film on the front surface, the third protective film having a density smaller than that of the first protective film.
In addition, the display layer includes a front surface for displaying an image, and a reverse surface opposite to the front surface, the first protective film being on the front surface; preferably, the display panel further includes a third protective film on the reverse surface, the third protective film having a density smaller than that of the first protective film.
In addition, the display layer comprises a folding region and a flat region, the first protective film comprises a first region opposite to the folding region and a second region opposite to the flat region, and the density of the first region is gradually reduced along the direction close to the display layer; preferably, the density of the second region is uniform. So set up, stress variation when first region adaptation that can be better is buckled for it is more convenient to fold.
In addition, the display layer comprises a folding area and a flat area, the second protective film comprises a third area opposite to the folding area and a fourth area opposite to the flat area, and the density of the third area is gradually reduced along the direction close to the display layer; preferably, the density of the fourth region is uniform. So set up, the third region can be better the adaptation stress variation when buckling for it is more convenient to fold.
In addition, the first protective film is composed of a stack of first particles, the second protective film is composed of a stack of second particles, and a volume of the first particles is larger than a volume of the second particles. Because the volume of first particulate matter is bigger, fluffy easily compression more to release compressive stress that can be better, because the volume of second particulate matter is littleer, thereby the quantity of particulate matter is more in the second protection film of unit area, and difficult fracture is more in tensile in-process, thereby release tensile stress that can be better.
In addition, under the flat state, the volume range of the first particles is 0.065-0.52 mm3The volume range of the second particles is 0.0005-0.113 mm3。
In addition, under the leveling state, the distance range between the adjacent first particulate matters is 0.5-1 mm, and the distance range between the adjacent second particulate matters is 0.1-0.6 mm.
In addition, the display panel further includes a fourth protective film on the second protective film, the fourth protective film having a density greater than that of the second protective film.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
FIG. 1 is a schematic structural diagram of a flat display panel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a display panel provided in an embodiment of the invention in a folded state.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
The embodiment of the present invention relates to a display panel 100, as shown in fig. 1 and 2, including: the display device includes a foldable display layer 10, a first protection film 11 on the display layer 10, and a second protection film 12 on the first protection film 11, wherein an elastic coefficient of the first protection film 11 is higher than an elastic coefficient of the second protection film 12, and an elongation of the second protection film 12 is higher than an elongation of the first protection film 11.
Compared with the prior art, the elastic coefficient of the first protection film 11 is higher than that of the second protection film 12, wherein the elastic coefficient is used for representing compressibility, the higher the elastic coefficient is, the more easily the first protection film is compressed, so that the compressive stress can be applied to the first protection film 11, the elongation of the second protection film 12 is higher than that of the first protection film 11, wherein the elongation is used for representing ductility, the higher the elongation is, the better the ductility is, the tensile stress can be applied to the second protection film 12, so that the first protection film 11 can be pressed by bending and the second protection film 12 can be stretched by bending during the folding of the display panel 10, so that the compressive stress at the inner side of the bending part and the tensile stress at the outer side can be better released, and the problem that the display panel 10 is difficult to fold due to the overlarge compressive stress or the overlarge tensile stress is avoided, meanwhile, the foldable display panel 100 can be effectively protected, and the service life is prolonged.
In the present embodiment, the first protective film 11 and the second protective film 12 are made of the same material, and the density of the second protective film 12 is higher than the density of the first protective film 11.
Specifically, the first protection film 11 is formed by stacking first particles 111, the second protection film 12 is formed by stacking second particles 121, and the volume of the first particles 111 is greater than that of the second particles 121, in the folded state, the distance between the adjacent first particles 111 is reduced, the first particles 111 are compressed, the distance between the adjacent second particles 121 is increased, and the second particles 121 are stretched, because the first particles 111 have a larger volume and are more fluffy and easier to compress, the compression stress can be better released, the folding is facilitated, and because the volume of the second particles 121 is smaller, the number of particles in the second protection film 12 per unit area is larger, the ductility is better, the breakage is more difficult in the stretching process, and the tensile stress can be better released.
In the embodiment, the volume range of the first particles 111 is 0.065-0.52 mm in the flat state3E.g. 0.065mm3、0.1mm3、0.3mm3、0.52mm3And the volume range of the second particles 121 is 0.0005-0.113 mm3E.g. 0.0005mm3、0.001mm3、0.01mm3、0.113mm3And the distance A between the adjacent first granules 111 (the distance between the centers of the adjacent first granules 111) is in the range of 0.5 to 1mm, for example, 0.5mm, 0.65mm, 0.75mm, 1mm, and the like, and the distance B between the adjacent second granules 121 (the distance between the centers of the adjacent second granules 111) is in the range of 0.1 to 0.6mm, for example, 0.1mm, 0.2mm, 0.4mm, 0.6mm, and the like, wherein the first granules 111Particle 111 with second particle 121 can be spherical, and at this moment, the volume of first particle 111 with the volume of second particle 121 can be calculated by distance A and distance B, so set up, under the prerequisite of having guaranteed that display panel 100 can be folded for display panel 100 has better structural strength, thereby is difficult for folding many times because of display panel 100 and leads to display panel 100 to damage.
Preferably, the first particles 111 and the second particles 121 may be made of polyimide, and the polyimide has good elasticity, so that the first particles 111 have a large volume and a sparse texture, thereby ensuring effective compression, and the second particles 121 have a small volume and a sparse texture, thereby ensuring effective stretching.
It is understood that different materials may be used for the first protection film 11 and the second protection film 12, and it is only necessary to ensure that the elastic coefficient of the first protection film 11 is higher than that of the second protection film 12, and the elongation of the second protection film 12 is higher than that of the first protection film 11.
Specifically, the material of the first protection film 11 has a higher elastic coefficient than the material of the second protection film 12, and the material of the second protection film 12 has a higher elongation than the material of the first protection film 11. Optionally, the first protection film 11 is a metal film, wherein the metal film is made of TiO with porous stainless steel as a substrate2The second protective film 12 is an organic polymer film, which may be a polymer film prepared from organic polymer materials such as epoxy resin, phenolic plastic, or melamine formaldehyde resin, and of course, the first protective film 11 and the second protective film 12 may also be made of different organic polymer materials, which is not limited herein.
It should be noted that, when the materials of the first protection film 11 and the second protection film 12 are different, the first protection film 11 and the second protection film 12 may be composed of particles, and the volume of the particles composing the first protection film 11 may be greater than, equal to, or even smaller than the volume of the particles composing the second protection film 12, and the first protection film 11 and the second protection film 12 may also directly form a complete film without adopting a form that a plurality of particles compose a film, which is not limited herein.
In practical applications, the display layer 10 includes a front surface for displaying images and a back surface opposite to the front surface, and the first protective film 11 is located on the back surface, and at this time, the display panel 100 can be folded inwards, that is, the front surface is inside after the display panel 100 is folded, and the first protective film 11 and the second protective film 12 are sequentially outward.
In this case, the display panel 10 may not include a flexible substrate, the display layer 10 may be directly provided on the first protective film 11 (which is equivalent to using the first protective film 11 and the second protective film 12 instead of a flexible substrate in the related art), and the first protective film 11 and the second protective film 12 may be used as a substrate to provide support and a protection device, thereby reducing the number of manufacturing processes of the display panel 100 and reducing the manufacturing cost of the display panel 100. Of course, the display panel 10 may also include a flexible substrate to provide support for various film layers disposed thereon, the flexible substrate may be formed of a polymer material such as imide (PI), Polycarbonate (PC), polyether sulfone (PES), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), Polyarylate (PAR), or glass Fiber Reinforced Plastic (FRP), and the flexible substrate may be a transparent, translucent, or opaque material.
Preferably, when the first protective film 11 is located on the reverse side, the display panel 100 may further include a third protective film (not shown) located on the front side, the density of the third protective film is lower than that of the first protective film 11, and when the display panel 100 is folded inward, that is, the front side is inside after the display panel 100 is folded, the third protective film can protect the front side of the display layer 10, so as to prevent the front side of the display layer 10 from being worn during the bending process.
It should be understood that the first protection film 11 may also be disposed on the front surface, in this case, the display panel 100 may be folded outward, that is, the front surface is on the outside after the display panel 100 is folded, and the second protection film 12 and the first protection film 11 are disposed inward in sequence, and the first protection film 11 and the second protection film 12 should use a material that does not affect the display image of the display layer 10, for example, some organic polymer materials with good light transmittance, such as PET material, ARM material, and the like.
Preferably, when the first protective film 11 is disposed on the front surface, the display panel 100 may also include a third protective film (not shown) having a density lower than that of the first protective film 11, except that the third protective film is disposed on the back surface, and when the display panel 100 is folded outward, that is, the front surface is outside after the display panel 100 is folded, the third protective film can protect the back surface of the display layer 10, so as to prevent the back surface of the display layer 10 from being worn during the folding process.
It is worth mentioning that the display layer 10 includes a folded region and a flat region, the first protection film 11 includes a first region 111 facing the folded region and a second region 112 facing the flat region, the density of the first regions 111 decreases gradually in a direction approaching the display layer 10, the density of the second regions 112 is uniform, and preferably, the density of the second regions 112 is greater than the density of the first regions 111, so that the first region 111 can better accommodate the stress variation during bending (the closer to the display layer 10, the greater the compressive stress, and the farther from the display layer 10, the greater the tensile stress), making folding more convenient, and, since the second regions 112 have uniform density and large density (the higher the density, the higher the structural strength, the better the supporting effect), it is possible to provide a supporting force for supporting the display layer 10.
Of course, the density of the second region 112 may be the same as that of the first region 111, and in this case, the second region 112 and the first region 111 can be simultaneously prepared (in the preparation process, one step), so that the preparation steps of the first protection film 11 are reduced, which has a cost advantage.
Optionally, the second protective film 12 may include a third region 121 facing the folding region and a fourth region 122 facing the flat region, a density of the third region 121 gradually decreases in a direction approaching the display layer 10, a density of the fourth region 122 is uniform, and preferably, the density of the fourth region 122 is greater than that of the third region 121. Of course, the density of the third region 121 may also be the same as that of the fourth region 122, and will not be described herein again.
It should be mentioned that the display panel 100 further includes a fourth protection film located on the second protection film 12, the density of the fourth protection film is greater than that of the second protection film, optionally, the display panel may further include a fifth protection film, a sixth protection film and the like located on the fourth protection film in sequence, that is, the display panel 100 includes a plurality of protection films, the density of the plurality of protection films gradually decreases along a direction close to the display layer 10, and since the density difference between the plurality of protection films is smaller than that between two protection films, the bending effect may be better.
Specifically, the display layer 10 may include a TFT layer disposed on the flexible substrate, a planarization layer disposed between the TFT layer and the anode, an organic light emitting layer disposed on the anode, a cathode disposed on the organic light emitting layer, and a pixel defining layer disposed between the anode and the cathode and surrounding the organic light emitting layer, wherein the anode and the cathode drive the organic light emitting layer together.
In another embodiment, the display panel 100 may also include a first display panel and a second display panel, and the first display panel and the second display panel may be rotatably connected.
In addition, the display panel 100 may further include a touch screen panel, a polarizing layer, and a window, which are sequentially disposed on the display panel 10, and are not particularly limited herein.
Specifically, the display panel 100 may further include a glue layer disposed between the display layer 10 and the first protection film 11, and the glue layer is used to bond the display layer 10 and the first protection film 11, but of course, the glue layer may also be disposed between the first protection film 11 and the second protection film 12, so as to bond the first protection film 11 and the second protection film 12.
In some embodiments, the protection structure formed by the first protection film 11 and the second protection film 12 may also be configured as a housing shape extending around the periphery, so that the display layer 10 can be directly assembled by using the self shape without providing an adhesive layer.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (10)
1. A display panel, comprising: the display device includes a foldable display layer, a first protective film on the display layer, and a second protective film on the first protective film, the first protective film having a higher elastic coefficient than the second protective film, the second protective film having a higher elongation than the first protective film.
2. The display panel according to claim 1, wherein the first protective film and the second protective film are made of the same material, and a density of the second protective film is higher than a density of the first protective film.
3. The display panel according to claim 2, wherein the display layer includes a front surface for displaying an image, and a back surface opposite to the front surface, the first protective film being on the back surface;
preferably, the display panel further includes a third protective film on the front surface, the third protective film having a density smaller than that of the first protective film.
4. The display panel according to claim 2, wherein the display layer includes a front surface for displaying an image, and a back surface opposite to the front surface, the first protective film being on the front surface;
preferably, the display panel further includes a third protective film on the reverse surface, the third protective film having a density smaller than that of the first protective film.
5. The display panel according to claim 2, wherein the display layer includes a folded region and a flat region, the first protective film includes a first region facing the folded region and a second region facing the flat region, and a density of the first region is gradually decreased in a direction approaching the display layer;
preferably, the density of the second region is uniform.
6. The display panel according to claim 2, wherein the display layer includes a folding region and a flat region, the second protective film includes a third region facing the folding region and a fourth region facing the flat region, and a density of the third region gradually decreases in a direction approaching the display layer;
preferably, the density of the fourth region is uniform.
7. The display panel according to claim 2, wherein the first protective film is composed of a stack of first particles, the second protective film is composed of a stack of second particles, and a volume of the first particles is larger than a volume of the second particles.
8. The display panel according to claim 7, wherein the first particles have a volume ranging from 0.065mm to 0.52mm in a flat state3The volume range of the second particles is 0.0005-0.113 mm3。
9. The display panel according to claim 7, wherein in a flat state, the distance between the adjacent first particles is in a range of 0.5 to 1mm, and the distance between the adjacent second particles is in a range of 0.1 to 0.6 mm.
10. The display panel according to claim 2, further comprising a fourth protective film on the second protective film, wherein a density of the fourth protective film is higher than a density of the second protective film.
Priority Applications (1)
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| CN201910759998.6A CN110634396B (en) | 2019-08-16 | 2019-08-16 | Display panel |
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| CN201910759998.6A CN110634396B (en) | 2019-08-16 | 2019-08-16 | Display panel |
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| CN110634396A true CN110634396A (en) | 2019-12-31 |
| CN110634396B CN110634396B (en) | 2022-07-08 |
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| CN201910759998.6A Active CN110634396B (en) | 2019-08-16 | 2019-08-16 | Display panel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113744633A (en) * | 2020-05-28 | 2021-12-03 | 云谷（固安）科技有限公司 | Supporting unit, display module and display device |
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| CN110634396B (en) | 2022-07-08 |
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