CN113593414B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN113593414B CN113593414B CN202110873352.8A CN202110873352A CN113593414B CN 113593414 B CN113593414 B CN 113593414B CN 202110873352 A CN202110873352 A CN 202110873352A CN 113593414 B CN113593414 B CN 113593414B
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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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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
Abstract
The invention provides a display panel and a display device, belongs to the technical field of display, and can solve the problem of imaging interference. The display panel comprises a display screen and a first support film structure, wherein the first support film structure is positioned on one side of a non-display surface of the display screen, the first support film structure comprises a first support film layer, the in-plane phase difference and the thickness direction phase difference of the first support film layer are smaller than or equal to a first threshold value, or the in-plane phase difference and the thickness direction phase difference of the first support film layer are larger than or equal to a second threshold value, and the first threshold value is smaller than the second threshold value; through designing the in-plane phase difference Re and the thickness direction phase difference Rth of the first support film layer to be larger values or smaller values, when the display panel is a display panel of an under-screen camera, optical interference of human eye visible light wave bands can be avoided, display defects such as rainbow lines are eliminated, and halation interference of imaging is avoided.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to a display panel and a display device.
Background
The organic light emitting diode display device (Organic Light Emitting Display, OLED) gradually becomes the first choice of the screen, and has advantages of self-luminescence, high luminous efficiency, short response time, high definition and contrast, and the like, and meanwhile, the screen can be ensured to have certain flexibility and adaptability. With the development of flexible display screens, there is an increasing desire for foldable display products.
Flexible display panels currently generally include cover sheets, display screens, support films, and the like. The conventional support film material is PET (Polyethylene Terephthalate ) or CPI (transparent polyimide), and the phase retardation of the material can be caused by the anisotropy of the material, and optical interference is generated on different interfaces of incident light, so that if the conventional support film layer is applied to an OLED display panel of an under-screen camera, rainbow lines and the like can be generated, and imaging interference problems exist.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art, and provides a display panel and a display device, which can avoid imaging interference.
In a first aspect, an embodiment of the present invention provides a display panel, including a display screen and a first support film structure, where the first support film structure is located on a non-display surface side of the display screen, and the first support film structure includes a first support film layer, where an in-plane retardation and a thickness direction retardation of the first support film layer are less than or equal to a first threshold value, or where an in-plane retardation and a thickness direction retardation of the first support film layer are greater than or equal to a second threshold value, where the first threshold value is less than the second threshold value.
In some embodiments, the first threshold is less than 50nm, and/or the second threshold is greater than 7000nm.
In some embodiments, the mechanical parameters of the first support film layer simultaneously satisfy the following conditions:
the thickness is greater than or equal to 40um;
an elastic modulus of greater than or equal to 1.5Gpa and less than or equal to 8Gpa;
the elongation at break is greater than or equal to 3%.
In some embodiments, the mechanical parameters of the first support film layer simultaneously satisfy the following conditions:
the thickness is less than or equal to 80um;
an elastic modulus of 3Gpa or more and 8Gpa or less;
the elongation at break is greater than or equal to 5%.
In some embodiments, the first support film layer has a modulus of elasticity in a film forming stretch direction of greater than or equal to 5Gpa.
In some embodiments, the display panel is a folded display panel, and the film forming stretching direction of the first supporting film layer is perpendicular to the bending axis direction of the display panel.
In some embodiments, the first support film layer has a heat distortion temperature greater than 140 ℃.
In some embodiments, the first support film structure further comprises a first glue layer, wherein the first glue layer is located on one side of the first support film layer adjacent to the display screen and is adhered to the first support film layer.
In some embodiments, the front projection of the first support film structure on the display panel is located at least within the display area of the display panel.
In some embodiments, the front projection of the first support film structure on the display panel is located within a display area of the display panel, and the display panel further includes a second support film structure located within a peripheral area of the display panel.
In some embodiments, the second support film structure includes a second support film layer and a second glue layer, the second glue layer being located on a side of the second support film layer adjacent to the display screen.
In some embodiments, the second elastic modulus of the second glue layer is greater than the first elastic modulus of the first glue layer.
In some embodiments, the second elastic modulus is greater than 100Kpa and the first elastic modulus is less than 100Kpa.
In some embodiments, the second elastic modulus of the second glue layer is equal to the first elastic modulus of the first glue layer.
In some embodiments, the display panel further includes a first connection layer, a polarizer, a second connection layer, and a cover plate, where the first connection layer, the polarizer, the second connection layer, and the cover plate are sequentially stacked on one side of the display screen away from the first supporting film structure.
In some embodiments, the display panel includes a light-transmitting region, the display region of the display panel at least partially surrounds the light-transmitting region, and a first via hole penetrating the first connection layer, the polarizer, and the second connection layer is disposed in the light-transmitting region.
In some embodiments, the display panel further comprises a support and a third connection layer, the third connection layer being located on a side of the first support film structure remote from the display screen, the support being located on a side of the third connection layer remote from the first support film structure;
a second via hole penetrating through the support piece and the third connecting layer is arranged in the light-transmitting area;
the projections of the first via hole and the second via hole on the display panel are at least partially overlapped.
In a second aspect, an embodiment of the present invention further provides a display apparatus, including a display panel as described above.
In some embodiments, the display device further includes a photosensitive element, the photosensitive element includes an optical module and an imaging module, the imaging module is connected to the first surface of the optical module, the optical module is located in the accommodating space of the second via hole, and the optical module is connected to the support and the third connection layer through an edge sealant.
In some embodiments, the second surface of the optical module abuts against the surface of the first support film structure away from the display screen, or the second surface of the optical module is connected with the surface of the first support film structure away from the display screen through a glue material, and the second surface of the optical module is a surface opposite to the first surface.
In some embodiments, the second surface of the optical module is connected to the surface of the first support film structure away from the display screen through a glue material, the optical transmittance of the glue material is greater than or equal to 90%, and the haze of the glue material is less than or equal to 1.2%.
The display panel comprises a display screen and a first support film structure, wherein the first support film structure is positioned on one side of a non-display surface of the display screen, the first support film structure comprises a first support film layer, and the in-plane phase difference Re and the thickness direction phase difference Rth of the first support film structure are designed to be larger values or smaller values by improving optical parameters of the first support film layer in the first support film structure.
Drawings
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a film forming stretching direction and a bending axis direction of a first supporting film layer in a folding display panel according to an embodiment of the present invention;
FIG. 3 is a schematic view of a first support film structure according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a display panel shown in FIG. 5 including a display screen film structure;
fig. 7 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another display device according to an embodiment of the invention.
Detailed Description
The present invention will be described in further detail below with reference to the drawings and detailed description for better understanding of the technical solutions 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.
The OLED display panel (i.e., perforated screen) of the conventional proactive module includes: the support piece, third tie coat (connecting glue), support film structure including support film layer and glue material layer, OLED display screen, first tie coat, polaroid, second tie coat, apron and proactive module. The protective cover plate of the front shooting module and the protective cover plate of the OLED display panel are the same, and are integrally designed. The front-view module comprises a lens optical module and an imaging module, wherein a through hole is formed in each of a supporting piece, a third connecting layer, a supporting film layer, a glue layer, an OLED display screen, a first connecting layer, a polarizer and a second connecting layer in the punching screen, the front-view module is located in the through hole space, sealing, fixing and buffering are achieved through edge sealant, but the punching position of the punching screen cannot be displayed, and a real comprehensive screen cannot be achieved. The under-screen camera shooting is to place the front camera shooting module below the display area of the display panel, and the display screen (comprising a luminous layer, a back plate and a substrate) of the display panel and the supporting film layer do not need to be perforated, so that shooting and display can be simultaneously met, and a truly comprehensive screen is realized. Natural light becomes linear polarized light after passing through the polaroid, light is polarized light after passing through the polaroid, and polarized light passes through a traditional support film layer (PET, CPI material), and due to phase delay, the enhancement of partial wave bands and the weakening of partial wave bands can occur, so that partial rainbow lines appear, and the problem of imaging interference of a front camera module exists.
In order to solve the above-mentioned problems, an embodiment of the present invention provides a display panel, as shown in fig. 1, including a display screen 30 and a first support film structure 20, the first support film structure 20 being located on a non-display surface side of the display screen 30, the first support film structure 20 including a first support film layer 201, an in-plane retardation and a thickness direction retardation of the first support film layer 201 being less than or equal to a first threshold value, or the in-plane retardation and the thickness direction retardation of the first support film layer 201 being greater than or equal to a second threshold value, wherein the first threshold value is less than the second threshold value.
The in-plane retardation re= (Nx-Ny) ×d of the first support film 201, where Nx is the refractive index in the direction of the maximum refractive index in the plane of the first support film 201 (i.e. in the X direction), ny is the refractive index in the Y direction orthogonal to the X direction in the plane of the first support film 201, and d is the thickness of the first support film 201. In-plane refers to the plane in which the surface to which the display screen is attached is located.
The thickness direction retardation Rth of the first support film 201 is also referred to as an out-of-plane phase difference, rth= [ (nx+ny)/2-Nz ]. D, where Nx is the refractive index in the direction of the maximum refractive index in the plane of the first support film 201 (i.e., the X direction), ny is the refractive index in the Y direction orthogonal to the X direction in the plane of the first support film 201, nz is the refractive index in the thickness direction of the first support film 201, and d is the thickness of the first support film 201.
The display panel of the embodiment of the invention comprises a display screen 30 and a first support film structure 20, wherein the first support film structure 20 is positioned on the non-display surface side of the display screen 30, the first support film structure 20 comprises a first support film layer 201, and the in-plane phase difference Re and the thickness direction phase difference Rth of the first support film structure 20 are designed to be larger or smaller by improving the optical parameters of the first support film layer 201 in the first support film structure 20.
In the embodiment of the present invention, the display screen 30 is an OLED display screen, and may include a flexible substrate, a driving circuit, a dielectric layer, a light emitting layer, a packaging layer, a touch layer, and other structures. It should be noted that, in order to place the camera under the display panel and realize light emission while performing image acquisition, the display screen 30 needs to be specially designed, such as a transparent substrate, a transparent electrode (cathode/anode), a pixel design, a transparent material, etc., and the embodiment of the present invention focuses on the design of the support film material, and the transparent display design of the display screen 30 is not described too much.
The first supporting film structure 20 can reduce risks such as scraping and collision of the display panel substrate, play a role in protecting and supporting and preventing impact, and can also play a role in adjusting the stress of the display screen in the folding process of the flexible display panel when the display panel is a flexible display panel. In the display panel for under-screen photographing, holes are not required for the backboard, the substrate and the support film.
The optical parameters of the first support film 201 may also include one or any combination of the following: transmittance, haze, hue IaI, hue IbI, yellow Index (YI).
In some embodiments, the first support film 201 has a transmittance of greater than or equal to 90%, the first support film 201 has a haze of less than or equal to 3%, the first support film 201 has a hue IaI and a hue IbI of less than or equal to 2.5, and the first support film 201 has a yellowness index of greater than 0 and less than 2.
In some embodiments, the first threshold is less than 50nm, and/or the second threshold is greater than 7000nm.
In some embodiments, the first threshold is less than 15nm, and/or the second threshold is greater than 8000nm.
In some embodiments, when the first support film structure 20 is applied to a non-folded display panel, the mechanical parameters of the first support film layer 201 simultaneously satisfy the following conditions:
the thickness is greater than or equal to 40um;
an elastic modulus of greater than or equal to 1.5Gpa and less than or equal to 8Gpa;
the elongation at break is greater than or equal to 3%.
When the display panel is an OLED display panel, the display panel may be a folded display panel because the OLED display panel has a flexible characteristic. In this case, in some embodiments, the mechanical parameters of the first support film 201 simultaneously satisfy the following conditions:
the thickness is less than or equal to 80um;
an elastic modulus of 3Gpa or more and 8Gpa or less;
the elongation at break is greater than or equal to 5%.
In some embodiments, when the display panel is a folded display panel, the modulus of elasticity of the first support film layer 201 in the film forming stretching direction is greater than or equal to 5Gpa.
In some embodiments, when the display panel is a folded display panel, the film forming stretching direction of the first supporting film layer 201 is perpendicular to the bending axis direction of the display panel.
Fig. 2 is a schematic diagram of a film forming stretching direction and a bending axis direction of a first supporting film layer in a folded display panel according to an embodiment of the invention. As shown in fig. 2, the film forming stretching direction of the first supporting film layer 201 is the x-axis direction, and the bending direction of the display panel is shown by the downward arrow in fig. 2, that is, the bending axis direction of the first supporting film layer 201 is the y-axis direction, that is, the film forming stretching direction of the first supporting film layer 201 is perpendicular to the bending axis direction of the display panel, so that the strength of the first supporting film layer 201 in the bending direction is the greatest, and the strength of the flexible folding display panel can be improved.
In order to achieve good environmental reliability and process requirements, in some embodiments, the heat distortion temperature of the support film 1 may be greater than 140 ℃, and illustratively, the heat distortion temperature of the support film 1 is greater than 160 ℃.
The material of the first supporting film layer 201 in the embodiment of the present invention may be triacetate fiber, methyl methacrylate or cyclic olefin polymer, and a PET material with an ultra-low phase difference or a PET material with an ultra-high phase difference, etc. The above materials are required to satisfy at least the conditions of the in-plane retardation Re and the thickness direction retardation Rth of the first support film layer 201.
In some embodiments, as shown in fig. 1, the first supporting film structure 20 further includes a first adhesive layer 202, where the adhesive layer 202 is located on a side of the first supporting film layer 201 adjacent to the display screen 30 and is adhered to the first supporting film layer 201.
Fig. 3 is a schematic diagram of a first support film structure according to an embodiment of the present invention, and in some embodiments, as shown in fig. 3, the first support film structure 20 may further include a protective film 3 and a release film 4, where the protective film 3 is located on a side of the first support film layer 201 away from the first adhesive layer 202, and the release film 4 is located on a side of the first adhesive layer 202 away from the first support film layer 201. Fig. 3 shows an intermediate form of the first support film structure 20 in the manufacturing process, and the protective film 3 and the release film 4 need to be peeled off when the first support film structure 20 is applied to a display panel.
In some embodiments, the front projection of the first support film structure 20 on the display panel is at least located in the display area of the display panel, i.e. the first support film structure 20 corresponds to at least the display area (i.e. the AA area) of the display panel. That is, the first support film structure 20 may correspond to both the display area and the peripheral area of the display panel, or the first support film structure 20 may correspond to only the display area of the display panel.
In order to meet the process requirements, such as binding process requirements, the display panel of the embodiment of the invention can also adopt a supporting film structure regional design, the AA area adopts a material meeting the optical requirements so as to realize the proactive imaging requirements, and the peripheral area (binding area) adopts a traditional material so as to ensure the stable and reliable binding process. Thus, in some embodiments, as shown in fig. 4, the front projection of the first support film structure 20 on the display panel is located within the display area of the display panel, the display panel further includes a second support film structure 20', and the front projection of the second support film structure 20 on the display panel is located within the peripheral area of the display panel.
In some embodiments, as shown in fig. 4, the second supporting film structure 20' includes a second supporting film layer 203 and a second adhesive layer 204, where the second adhesive layer 204 is located on a side of the second supporting film layer 203 adjacent to the display screen 30, that is, the second adhesive layer 204 covers the second supporting film layer 203. The first supporting film layer 201 and the second supporting film layer 203 are arranged in the same layer, and the first glue layer 202 and the second glue layer 204 are arranged in the same layer.
The first adhesive layer 202 and the second adhesive layer 204 are support film adhesives, and may be acrylate materials. It should be noted that the second supporting film layer 203 may be made of a conventional supporting film material, for example, PET or CPI.
In some embodiments, the elastic modulus of the second glue layer 204 may be equal to the elastic modulus of the first glue layer 202, and the elastic modulus of the second glue layer 204 may also be different from the elastic modulus of the first glue layer 202.
When the elastic modulus of the second adhesive layer 204 is different from the elastic modulus of the first adhesive layer 202, in order to ensure the stability of the binding process, the second elastic modulus of the second adhesive layer 204 in the peripheral area is greater than the first elastic modulus of the first adhesive layer 202 in the AA area. In some embodiments, the second elastic modulus of the second glue layer 204 is > 100Kpa. In some embodiments, in order to perform stress adjustment when the display panel is bent, the flexibility of the adhesive is considered and the display panel is prevented from being stressed too much, and in some embodiments, the first elastic modulus of the first adhesive layer 202 located in the AA area is less than 100Kpa.
In some embodiments, the second elastic modulus is greater than 100Kpa and the first elastic modulus is less than 100Kpa.
As shown in fig. 4 and 5, the display panel further includes a first connection layer 402, a polarizer 401, a second connection layer 502, and a cover plate 501, where the first connection layer 402, the polarizer 401, the second connection layer 502, and the cover plate 501 are sequentially stacked on a side of the display screen 30 away from the first supporting film structure 20. Wherein, the first connection layer 402 is a glue adhesive, and may be an acrylate material; the second tie layer 502 is a first optical adhesive layer, which may be an acrylate material; the cover plate 501 may be a glass cover plate, and silicate glass or ultra-thin glass (applied to a folded display panel) may be selected. The polarizer 401 includes a polarizer functional layer and a glue material, and may be a combination of triacetate fiber, polypropylene and a compensation film.
In order to improve the transmittance, in some embodiments, as shown in fig. 4, the display panel further includes a light-transmitting area (an area indicated by a dotted line in fig. 4), where the display area at least partially surrounds the light-transmitting area, and a first via penetrating the first connection layer 402, the polarizer 401, and the second connection layer 502 is disposed in the light-transmitting area, where the first via corresponds to a position of the display screen 30.
In some embodiments, as shown in fig. 5, the first via hole penetrating the first connection layer 402, the polarizer 401, and the second connection layer 502 may not be provided.
In some embodiments, as shown in fig. 4, the display panel may further include a support 101 and a third connection layer 102, where the third connection layer 102 is located on a side of the first support film structure 20 away from the display screen 30, i.e., the third connection layer 102 is located on a side of the first support film layer 201 away from the display screen 30, and the support 101 is located on a side of the third connection layer 102 away from the first support film structure 20. The light-transmitting area is provided with a second via penetrating through the supporting member 101 and the third connecting layer 102, the projections of the first via and the second via on the display panel are at least partially overlapped, and the second via is used for accommodating a photosensitive element (such as a front camera module). The supporting member 101 may be a heat sink, and may be a heat sink supporting metal material such as Cu foil graphite sheet, cu, stainless steel, etc., and the third connecting layer 102 may be a material such as a connection glue or a foam cushion glue.
In some embodiments, as shown in fig. 5, the display panel may be provided with the second via hole penetrating the support 101 and the third connection layer 102 only in the light-transmitting region (the region shown by the dotted line in fig. 5), without providing the first via hole.
The following describes the use of the first support film structure 20 in detail with reference to fig. 3 and 4 and fig. 3 and 5, taking the use of the first support film structure in the display area of the display panel as an example. The protective film 3 of the first supporting film structure 20 is removed, a third connecting layer 102 and a supporting sheet 101 are sequentially formed on the surface, far away from the first adhesive layer 202, of the first supporting film layer 201, and after the release film 4 of the first supporting film structure 20 is removed, the first supporting film structure 20 is adhered to the display screen 30 through the first adhesive layer 202.
Fig. 6 is a schematic structural diagram of the display panel shown in fig. 5, which includes a display screen film structure, and in combination with fig. 5 and fig. 6, the display panel includes a first supporting film 201, a first adhesive layer 202, a polarizer 401, a first connection layer 402, a second connection layer 502, and a cover plate 501.
The display screen 30 includes, in order in a direction away from the first adhesive layer 202, a flexible substrate 301, a GI (Gate Insulator) layer 302, an active layer 303, a first Gate layer 304, a second Gate layer 305, an intermediate layer 306, a source-drain electrode layer 307, a planarization layer 308, an anode layer 309, a pixel defining layer 310, a support layer 311, a light emitting structure 312, a cathode film layer 313, a first inorganic encapsulation layer 314, a second inorganic encapsulation layer 315, and a third inorganic encapsulation layer 316. Wherein, the flexible substrate 301 can serve as a buffer layer to play a role in buffering, and the GI layer 302 can be inorganic materials such as silicon oxide, silicon nitride, and the like; the active layer 303 is a-Si, forming a TFT (Thin Film Transistor, thin film field effect transistor) channel; the first gate layer 304 may be a metal material such as Mo; the intermediate layer 306 is an inorganic film layer; the planarization layer 308 may be PI glue; the anode layer 309 is formed by a metal etching process; the light emitting structure 312, including the area light emitting material and the entire cathode, may be formed by an evaporation process.
It should be noted that if the display panel is a touch display panel, a touch layer (not shown) may be formed on the third inorganic encapsulation layer 316, and the touch layer includes a metal wire and an insulating layer. When the display panel is an on-cell (external touch) display panel, an external touch layer may be further formed on the polarizer 401.
The embodiment of the invention also provides a display device which comprises the display panel.
In some embodiments, the display device is an under-screen camera, and correspondingly, as shown in fig. 7 and 8, the support 101 and the third connection layer 102 of the display panel of the display device are provided with second through holes, the display device further comprises a photosensitive element, the photosensitive element comprises an optical module 70 and an imaging module 80, the imaging module 80 is connected with the first surface of the optical module 70, the optical module 70 is located in the accommodating space of the second through holes, the optical module 70 is connected with the support 101 and the third connection layer 102 through an edge sealant 90, that is, the edge sealant 90 is disposed at the cross section of the support 101 and the cross section of the third connection layer 102 formed by the second through holes, and in the process of installing the photosensitive element in the second through holes, the side surface of the optical module 70 presses the edge sealant 90, so that the photosensitive element is connected with the display panel, and the display device with the under-screen camera is formed. It should be noted that, in order to ensure lighting of the photosensitive element, the edge sealant 90 is located outside the lighting area of the optical module 70 and the imaging module 80, and the thickness of the edge sealant 90 is greater than or equal to the sum of the thickness of the supporting member 101 and the thickness of the third connecting layer 102.
In some embodiments, as shown in fig. 7, the second surface of the optical module 70 abuts against the surface of the first supporting film structure 20 away from the display screen 30 (i.e. the surface of the first supporting film layer 201 away from the display screen 30), so that no air enters between the optical module 70 and the first supporting film layer 201, and thus the light entering amount of the photosensitive element is ensured.
In some embodiments, as shown in fig. 8, the second surface of the optical module 70 is connected to the surface of the first supporting film structure 20 away from the display screen 30 (i.e. the surface of the first supporting film layer 201 away from the display screen 30) through the adhesive 60, and the second surface of the optical module 70 is the surface opposite to the first surface. By arranging the adhesive 60, the damage to the display panel caused by the propping of the photosensitive element can be reduced, the imprint on the display panel can be avoided, and the photosensitive element can be stably fixed.
In some embodiments, as shown in fig. 8, the optical transmittance of the glue material 60 is greater than or equal to 90%, and the haze of the glue material 60 is less than or equal to 1.2%.
It should be noted that, the display device of the present invention is described by taking the display panel shown in fig. 5 as an example, and those skilled in the art will recognize that the display panel in the display device may be the display panel shown in fig. 4, and the connection relationship between the photosensitive element and the display panel is shown in fig. 7 and 8, both the display panel shown in fig. 4 and the display panel shown in fig. 5.
The light path needs to pass through the OLED display screen and the supporting film structure additionally. Because the OLED display screen approximates each item of universality and the supporting film structure is the last light emitting medium, the light emitting effect of the OLED display panel of the under-screen camera can be improved by improving the optical characteristics of the supporting film layer in the supporting film structure and solving the optical interference problem.
In order to solve the problem of rainbow lines of under-screen shooting, the embodiment of the invention improves the material of the supporting film layer, adopts the supporting film layer material meeting the optical requirements, makes special limits on Re and Rth to reach the optical requirements, further adds mechanical and thermal requirements, and improves the technological performance and folding performance. Through polaroid perforation structure, can further promote the transmissivity, adopt the support rete material of improvement simultaneously, solve the rainbow line of stray light. Through the design of the supporting film structure partition, the AA area adopts the improved supporting film layer provided by the embodiment of the invention, and the peripheral area can adopt the supporting film layer (middle level Re/Rth) made of PET material, so that the binding process effect is ensured.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention and the invention is not limited thereto. 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 (19)
1. The display panel is characterized by comprising a display screen and a first support film structure, wherein the first support film structure is positioned on the non-display surface side of the display screen, the first support film structure comprises a first support film layer, the in-plane phase difference and the thickness direction phase difference of the first support film layer are smaller than or equal to a first threshold value, or the in-plane phase difference and the thickness direction phase difference of the first support film layer are larger than or equal to a second threshold value, and the first threshold value is smaller than the second threshold value;
the front projection of the first support film structure on the display panel is positioned in the display area of the display panel, and the display panel further comprises a second support film structure, wherein the front projection of the second support film structure on the display panel is positioned in the peripheral area of the display panel.
2. The display panel according to claim 1, wherein the first threshold is less than 50nm and/or the second threshold is greater than 7000nm.
3. The display panel of claim 1, wherein the mechanical parameters of the first support film layer simultaneously satisfy the following conditions:
the thickness is greater than or equal to 40um;
an elastic modulus of greater than or equal to 1.5Gpa and less than or equal to 8Gpa;
the elongation at break is greater than or equal to 3%.
4. The display panel of claim 1, wherein the mechanical parameters of the first support film layer simultaneously satisfy the following conditions:
the thickness is less than or equal to 80um;
an elastic modulus of 3Gpa or more and 8Gpa or less;
the elongation at break is greater than or equal to 5%.
5. The display panel according to claim 4, wherein the elastic modulus in the film forming stretching direction of the first support film layer is 5Gpa or more.
6. The display panel according to claim 4, wherein the display panel is a folded display panel, and the film forming stretching direction of the first supporting film layer is perpendicular to the bending axis direction of the display panel.
7. The display panel of claim 1, wherein the heat distortion temperature of the first support film layer is greater than 140 ℃.
8. The display panel of any one of claims 1-7, wherein the first support film structure further comprises a first glue layer positioned on a side of the first support film layer adjacent to the display screen and bonded to the first support film layer.
9. The display panel of claim 8, wherein the second support film structure comprises a second support film layer and a second glue layer, the second glue layer being located on a side of the second support film layer adjacent to the display screen.
10. The display panel of claim 9, wherein the second elastic modulus of the second glue layer is greater than the first elastic modulus of the first glue layer.
11. The display panel of claim 10, wherein the second elastic modulus is greater than 100Kpa and the first elastic modulus is less than 100Kpa.
12. The display panel of claim 9, wherein the second elastic modulus of the second glue layer is equal to the first elastic modulus of the first glue layer.
13. The display panel of any one of claims 1-7, further comprising a first connection layer, a polarizer, a second connection layer, and a cover plate, wherein the first connection layer, the polarizer, the second connection layer, and the cover plate are sequentially stacked on a side of the display screen away from the first support film structure.
14. The display panel of claim 13, wherein the display panel comprises a light transmissive region at least partially surrounding the light transmissive region, the light transmissive region having a first via disposed therein that extends through the first connection layer, the polarizer, and the second connection layer.
15. The display panel of claim 14, further comprising a support and a third connection layer, the third connection layer being located on a side of the first support film structure remote from the display screen, the support being located on a side of the third connection layer remote from the first support film structure;
a second via hole penetrating through the support piece and the third connecting layer is arranged in the light-transmitting area;
the projections of the first via hole and the second via hole on the display panel are at least partially overlapped.
16. A display device comprising a display panel according to any one of claims 1-15.
17. The display device of claim 16, wherein the display panel is the display panel of claim 15, the display device further comprising a photosensitive element, the photosensitive element comprising an optical module and an imaging module, the imaging module being coupled to the first surface of the optical module, the optical module being located in the receiving space of the second via, the optical module being coupled to the support and the third connection layer by an edge sealant.
18. The display device of claim 17, wherein the second surface of the optical module abuts against a surface of the first support film structure away from the display screen, or wherein the second surface of the optical module is connected to a surface of the first support film structure away from the display screen by a glue, and wherein the second surface of the optical module is an opposite surface to the first surface.
19. The display device of claim 18, wherein the second surface of the optical module is connected to a surface of the first support film structure away from the display screen by a glue, the glue has an optical transmittance of greater than or equal to 90%, and the glue has a haze of less than or equal to 1.2%.
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| CN114495721B (en) * | 2022-02-07 | 2023-09-01 | 武汉华星光电半导体显示技术有限公司 | Display panel and display device |
| CN114613277A (en) * | 2022-03-31 | 2022-06-10 | 合肥维信诺科技有限公司 | Display panel and display device |
| CN114927628A (en) * | 2022-05-27 | 2022-08-19 | 武汉华星光电半导体显示技术有限公司 | Display panel and display device |
| CN115064065A (en) * | 2022-06-07 | 2022-09-16 | 武汉华星光电半导体显示技术有限公司 | Display device |
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