CN217426335U - Protection film and display module - Google Patents

Abstract

The utility model provides a protection film and display module assembly relates to and shows technical field to effectively prevent that the protection film opening part from taking place the fold and the bad and damage display panel's of outward appearance that leads to risk. The protective film comprises a metal layer, and a buffer layer and an adhesive layer which are sequentially arranged on one side of the metal layer. The metal layer comprises first openings, the buffer layer and the bonding layer jointly comprise one or more second openings, and the orthographic projection of the edge of each first opening on the plane of the protective film is positioned outside the orthographic projection of the edge of each second opening on the plane of the protective film. And filling gaskets are arranged in the first openings, and the orthographic projection of the edges of the filling gaskets on the plane of the protective film is positioned outside the orthographic projection of the edges of each second opening on the plane of the protective film. The protective film is used for protecting the display module from being damaged in the transportation and storage processes and has the functions of heat dissipation and shading.

Description

Protection film and display module

Technical Field

The utility model relates to a show technical field, especially relate to a protection film and display module assembly.

Background

Portable intelligent terminals are becoming an indispensable part of people in modern life. Meanwhile, the requirement for the miniaturization design of the portable intelligent terminal is more and more demanding. In order to compress space as much as possible and meet the requirement of miniaturization, electronic components such as an infrared sensor, a rear camera, a light emitting diode and the like are embedded into a display module of a portable intelligent terminal at present. Before assembling into portable intelligent terminal's complete machine with display module assembly, need use the protection film to protect display module assembly not damaged in transportation and storage process to exert heat dissipation and shading effect. Because electronic components is in the corresponding opening of embedding protection film, for avoiding electronic components to push up and hinder display panel, the protection film opening part increases the buffer layer, when assembling into portable intelligent terminal's complete machine with the display module assembly, the fold takes place easily for the buffer layer around the protection film opening part, leads to the unable closely display panel that laminates of protection film, causes the bad and risk of damaging display panel of outward appearance.

SUMMERY OF THE UTILITY MODEL

For overcoming the defect among the above-mentioned prior art, the utility model provides a protection film and display module assembly to prevent effectively that the protection film opening part from taking place the fold and the bad and damage display panel's of outward appearance that leads to risk.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model discloses a first aspect provides a protection film, the protection film includes: the metal level and set up in proper order buffer layer and adhesive linkage in metal level one side. The metal layer comprises a first opening, the buffer layer and the bonding layer together comprise one or more second openings, and the orthographic projection of the edge of the first opening on the plane of the protective film is positioned outside the orthographic projection of the edge of each second opening on the plane of the protective film. And a filling gasket is arranged in the first opening, and the orthographic projection of the edge of the filling gasket on the plane of the protective film is positioned outside the orthographic projection of the edge of each second opening on the plane of the protective film.

In some embodiments, the plane of the protective film is perpendicular to the thickness direction of the protective film.

In some embodiments, the shortest distance from each point of the edge of each second opening in the orthographic projection of the plane of the protective film to the orthographic projection of the edge of each first opening in the plane of the protective film is 0.4mm to 1.8 mm.

In some embodiments, an orthographic projection of each second opening on the edge of the buffer layer on the plane of the protective film coincides with an orthographic projection of the same second opening on the edge of the adhesive layer on the plane of the protective film.

In some embodiments, the filling pad is made of a white opaque material.

In some embodiments, an orthographic projection of each second opening on the edge of the buffer layer on the plane where the protective film is located does not coincide with an orthographic projection of the same second opening on the edge of the adhesive layer on the plane where the protective film is located, and each second opening includes a sub-opening located on the adhesive layer and a sub-opening located on the buffer layer. The orthographic projection of the edge of the first opening on the plane of the protective film is positioned outside the orthographic projection of the edge of the sub-opening of the adhesive layer on the plane of the protective film, and the orthographic projection of the edge of the first opening on the plane of the protective film is positioned outside the orthographic projection of the edge of the sub-opening of the buffer layer on the plane of the protective film.

In some embodiments, the material of the filling gasket is polyethylene terephthalate.

In some embodiments, the thickness of the filler pad ranges from 50 μm to 65 μm.

In some embodiments, an orthographic projection of the filling gasket on a plane of the protective film is positioned inside an orthographic projection of the edge of the first opening on a plane of the protective film.

In some embodiments, the distance between the edge of the filler pad and the edge of the first opening ranges from 0.4mm to 0.6 mm.

In some embodiments, the protective film further comprises a release film attached to a surface of the adhesive layer on a side away from the buffer layer.

In some embodiments, the protective film further comprises a protective adhesive layer attached to the surface of the filling gasket on the side away from the buffer layer.

In some embodiments, the protective adhesive layer is a transparent protective adhesive layer.

In some embodiments, the protective film further includes a light shielding layer disposed on a side of the protective adhesive layer away from the filling pad.

The second aspect of the utility model provides a display module assembly, display module assembly includes: a display panel and the protective film provided in some of the above embodiments, the adhesive layer of the protective film being connected to a non-display side of the display panel.

The embodiment of the utility model provides a protection film is provided with the packing gasket in the first opening of metal level, and the packing gasket has covered one or more second openings on buffer layer and adhesive linkage, from this, can improve the support intensity of protection film opening part. Compared with the prior art, the utility model discloses an attached when inclining to display panel non-display of protection film, because first opening part has increased the packing gasket, the packing gasket can protect the one or more second opening parts that set up on buffer layer and adhesive linkage to be difficult to take place the fold for protection film and display panel closely laminate, thereby guaranteed that display panel outward appearance is good and reduced display panel and received the risk of damage.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. Furthermore, the drawings in the following description may be regarded as schematic diagrams, and are not intended to limit the actual size of products, the actual flow of methods, the actual timing of signals, and the like, according to embodiments of the present invention.

FIG. 1A is a block diagram of a portable intelligent terminal according to some embodiments;

FIG. 1B is a block diagram of a display module according to some embodiments;

FIG. 2 is a block diagram of an OLED display panel according to some embodiments;

FIG. 3 is a partial cross-sectional view of an OLED display panel according to some embodiments;

FIG. 4 is a partial cross-sectional view of another OLED display panel according to some embodiments;

FIG. 5 is a block diagram of a pixel circuit in an OLED display panel according to some embodiments;

FIG. 6 is a partial block diagram of an LCD display panel according to some embodiments;

FIG. 7 is a circuit diagram of a pixel circuit in an LCD display panel according to some embodiments;

FIG. 8 is a block diagram of another display module according to some embodiments;

fig. 9A is a front view of a protective film according to some embodiments;

FIG. 9B is an enlarged view of a portion A1 of FIG. 9A;

fig. 10A is a front view of another protective film according to some embodiments;

FIG. 10B is an enlarged view of a portion A2 of FIG. 10A;

FIG. 11A is a cross-sectional view taken along line M2-M2 in FIG. 10B;

FIG. 11B is a cross-sectional view taken along line N2-N2 of FIG. 10B;

fig. 12A is a front view of yet another protective film according to some embodiments;

FIG. 12B is an enlarged view of a portion of FIG. 12A at 3;

FIG. 13A is a cross-sectional view taken along line M3-M3 in FIG. 12B;

FIG. 13B is a cross-sectional view taken along line N3-N3 of FIG. 12B;

FIG. 14 is a block diagram of yet another protective film according to some embodiments;

fig. 15 is a block diagram of yet another protective film according to some embodiments.

Detailed Description

The technical solutions in some embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments, but not all embodiments, of the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by a person of ordinary skill in the art all belong to the protection scope of the present invention.

Throughout the specification and claims, the term "comprising" is to be interpreted in an open, inclusive sense, i.e., as "including, but not limited to," unless the context requires otherwise. In the description herein, the terms "one embodiment," "some embodiments," "example," "certain examples," or "some examples" or the like are intended to indicate that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. The schematic representations of the above terms are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be included in any suitable manner in any one or more embodiments or examples.

In the following, the terms "first", "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless otherwise specified.

In describing some embodiments, the expression "connected" and its derivatives may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact with each other. The embodiments disclosed herein are not necessarily limited to the contents herein.

"A and/or B" includes the following three combinations: a alone, B alone, and a combination of A and B.

The use of "adapted to" or "configured to" herein means open and inclusive language that does not exclude devices adapted to or configured to perform additional tasks or steps.

As used herein, "about," "approximately," or "approximately" includes the stated values as well as average values that are within an acceptable range of deviation for the particular value, as determined by one of ordinary skill in the art in view of the measurement in question and the error associated with measurement of the particular quantity (i.e., the limitations of the measurement system).

Example embodiments are described herein with reference to cross-sectional and/or plan views as idealized example figures. In the drawings, the thickness of layers and regions are exaggerated for clarity. Variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, the exemplary embodiments should not be construed as limited to the shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the actual shape of a region of a device and are not intended to limit the scope of the exemplary embodiments.

As shown in fig. 1A, some embodiments of the present invention provide a portable intelligent terminal 1000. The portable intelligent terminal 1000 includes a display module 1001, a circuit board 1002, a cover plate 1003 and a housing 1004.

The housing 1004 is configured to protect the display module 1001 from being pressed by an external force to cause display malfunction. The longitudinal section of the casing 1004 is U-shaped, the display module 1001, the circuit board 1002 and other electronic components are all disposed in the casing 1004, the circuit board 1002 is disposed behind the display module 1001, and the cover plate 1003 is disposed on one side of the display module 1001 away from the circuit board 1002.

The cover 1003 may be rigid or flexible. When the cover plate 1003 is a rigid cover plate, the constituent material of the cover plate 1003 may be glass. When the cover 1003 is a flexible cover, the material of the cover 1003 may be Polyimide (PI) or the like, and in this case, the housing 1004 is a foldable housing.

The portable intelligent terminal can be any part with a display function, such as an intelligent watch, a tablet computer, a notebook computer, a Digital photo frame, a mobile phone, a Personal Digital Assistant (PDA), a Digital camera, a portable video camera, a viewfinder and the like. The embodiment of the utility model provides a do not do special restriction to above-mentioned portable intelligent terminal's concrete form.

As shown in fig. 1B, the display module 1001 includes a display panel 1 and electronic components disposed on the non-display side of the display panel 1, wherein the electronic components include, for example, a rear camera, an infrared sensor, and a light emitting diode. Before the display module 1001 is assembled into the complete portable intelligent terminal 1000, the protective film 2 is needed to protect the electronic components from being damaged in the transportation and storage processes. The protective film 2 is provided on the non-display side of the display panel 1. The Display panel 1 is used for displaying a picture, and may be an Organic Light Emitting Diode (OLED) Display panel, a Quantum Dot Light-Emitting Diodes (QLED) Display panel, or a Liquid Crystal Display (LCD) Display panel. The protective film 2 can form a good buffering and shading effect on each electronic component embedded therein in the transportation and storage process before the display module 1001 is assembled into the complete portable intelligent terminal 1000.

In some embodiments, the display panel 1 is an OLED display panel. As shown in fig. 2, the display panel 1 includes a display region 11 and a peripheral region 12 located on at least one side of the display region 11. The display region 11 includes a plurality of Sub pixels (Sub pixels) P defined by gate lines gl (gate line) and data lines dl (data line). For convenience of description, the following description will be given taking an example in which a plurality of subpixels P are arranged in a matrix, and subpixels P arranged in a row in the horizontal direction X are referred to as subpixels in the same row, and subpixels P arranged in a row in the vertical direction Y are referred to as subpixels in the same column. Each of the sub-pixels P includes a pixel circuit 100 and a light emitting device M electrically connected to the pixel circuit 100. The pixel circuit 100 can drive the light emitting device M electrically connected thereto to emit light.

As shown in fig. 3 and 4, the display panel 1 includes a display substrate 101 having a plurality of pattern layers arranged in a stack and an encapsulation layer 102. The encapsulation layer 102 is used to prevent moisture and oxygen from entering the display substrate 101, thereby preventing poor display.

The display substrate 101 includes a substrate 1011, and the gate line GL, the data line DL, the pixel circuit 100, and the light emitting device M are disposed on the substrate 1011.

The substrate 1011 is a rigid substrate or a flexible substrate. The constituent material of the rigid core 1011 may be glass. The flexible substrate 1011 may be made of one or more of Polyimide (PI), Polyethylene terephthalate (PET), Polyethylene naphthalate (PEN), and the like.

The gate line GL and the data line DL are insulated and crossed.

As shown in fig. 2 to 4, the pixel circuit 100 includes at least one thin film transistor TFT, each of which may employ a top gate or bottom gate structure, and at least one capacitor C. As shown in fig. 3, when the TFT is a top Gate structure, the TFT includes an active layer al (active layer), a Gate insulating layer gi (Gate insulation), a Gate Metal pattern layer GM (Gate Metal forming a Gate 1012), an interlayer dielectric layer ild (interlayer), and a source/drain Metal pattern layer SD (forming a source 1013 and a drain 1014) disposed on one side of a substrate 1011. In other embodiments, as shown in fig. 4, when the thin film transistor TFT is a bottom gate structure, it includes a gate metal pattern layer GM (forming a gate electrode 1012), a gate insulating layer GI, an active layer AL, and a source-drain metal pattern layer SD (forming a source electrode 1013 and a drain electrode 1014) disposed on one side of a substrate 1011.

The thin film transistor TFT is of various types, and may be an N-type thin film transistor or a P-type thin film transistor, for example, which is different only in the on condition. For an N-type thin film transistor, the high level is on and the low level is off. For a P-type thin film transistor, the low level is on and the high level is off. The active layer AL of the thin film transistor TFT may be formed of amorphous silicon, single crystalline silicon, polycrystalline silicon, or an oxide semiconductor. The active layer AL includes a channel region not doped with an impurity and source and drain regions formed by doping an impurity at both sides of the channel region. The impurity to be doped differs depending on the kind of the thin film transistor TFT, and may be an N-type impurity or a P-type impurity.

The capacitor C includes a first plate and a second plate with an interlayer insulating film as a dielectric provided therebetween.

Fig. 5 illustrates an electrical connection relationship between the inside and the outside of the pixel circuit, taking as an example a 2T1C structure in which one pixel circuit 100 includes two thin film transistors TFT (i.e., a switching thin film transistor T1, a driving thin film transistor T2) and one capacitor C. Although fig. 3 and 4 only show the structures and connection relations of the driving thin film transistor (such as the structures in the dotted line of fig. 3 and 4) and the light emitting device M, those skilled in the art can fully determine the structures of the switching transistor and connection relations thereof with other components according to the description of the context.

As shown in fig. 5, the switching thin film transistor T1 has a gate electrode 1012 connected to the gate line GL, a source electrode 1013 connected to the data line DL, and a drain electrode 1014 connected to the gate electrode 1012 of the driving thin film transistor T2. The source electrode 1013 of the driving thin film transistor T2 is connected to the common power supply line VDD, and the drain electrode 1014 is connected to the first electrode 1015 of the light emitting device M through a via. The first plate of the capacitor C is connected to the gate 1012 of the driving thin film transistor T2, and the second plate is connected to the source 1013 of the driving thin film transistor T2.

The switching thin film transistor T1 is turned on by a gate voltage applied to the gate line GL, thereby transmitting a data voltage applied to the data line DL to the driving thin film transistor T2. A data voltage transmitted to the driving thin film transistor T2 by the switching thin film transistor T1 and a common voltage applied to the driving thin film transistor T2 from the common power line VDD have a certain difference therebetween, a voltage corresponding to an absolute value of the difference is stored in the capacitor C, and a current corresponding to the voltage stored in the capacitor C flows into the light emitting device M through the driving thin film transistor T2 to cause the light emitting device M to emit light.

Further, as shown in fig. 3 and 4, the above-described light-emitting device M includes a first electrode 1015, a light-emitting functional layer 1016, and a second electrode 1017, one of the first electrode 1015 and the second electrode 1017 is an anode (for supplying holes) and the other is a cathode (for supplying electrons), the first electrode 1015 and the second electrode 1017 inject holes and electrons, respectively, into the light-emitting functional layer 1016, and light emission is configured when excitons (exitons) generated by the combination of the holes and the electrons transition from an excited state to a ground state.

The first electrode 1015 may be formed of a metal having high reflectivity, and the second electrode 1017 may be formed of a transparent conductive film. In this case, light from the light-emitting functional layer 1016 is reflected by the first electrode 1015 and is emitted to the outside through the second electrode 1017, whereby a top-emission light-emitting device is formed. But is not limited thereto, when the first electrode 1015 is formed of a transparent conductive film and the second electrode 1017 is formed of a metal having a high reflectance, a bottom emission type light emitting device may be formed. Of course, when both the first electrode 1015 and the second electrode 1016 are formed of a transparent conductive film, a double-sided light emitting type light emitting device may be formed.

The material of the transparent conductive film may be, for example, a metal Oxide such as ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), or IGZO (Indium Gallium Zinc Oxide). The metal having high reflectance may be an alloy such as magnesium aluminum alloy (MgAl) or lithium aluminum alloy (LiAl), or a simple metal such as magnesium (Mg), aluminum (Al), lithium (Li), or silver (Ag).

In some embodiments, as shown in fig. 3 and 4, the light emitting functional layer 1016 may include a light emitting layer 10161. In other embodiments, the light emitting function layer 1016 may include at least one of a Hole Injection Layer (HIL), a Hole Transport Layer (HTL), an Electron Transport Layer (ETL), and an Electron Injection Layer (EIL) (not shown in fig. 3 and 4) in addition to the light emitting layer 10161. When the light-emitting functional layer 1016 includes all of the above layers, a hole-injection layer, a hole-transport layer, a light-emitting layer 10161, an electron-transport layer, and an electron-injection layer are stacked in this order over the first electrode 1015 as an anode.

As shown in fig. 3 and 4, the display substrate 101 may further include a planarization layer 1018 disposed between the thin film transistor TFT and the first electrode 1015, and a pixel defining layer 1019 disposed on a side of the planarization layer 1018 away from the substrate 1011. The pixel defining layer 1019 includes a plurality of opening regions, and a dam disposed around each opening region. One light emitting device M is disposed in one opening region, and the first electrode 1015 and the light emitting layer 10161 of the adjacent light emitting devices M are separated by the bank of the pixel defining layer 1019. The second electrodes 1017 of the light emitting devices M are connected together, i.e., the second electrodes 1017 are a whole layer. The hole injection layer, the hole transport layer, the electron injection layer, and the like in the light-emitting functional layer 1016 may be separated by the bank of the pixel defining layer 1019 or may be a single layer. The pixel defining layer 1019 is made of black polyimide, for example, and can absorb light emitted from one light emitting device M toward another adjacent light emitting device M, thereby preventing light mixing between two adjacent sub-pixels.

The encapsulation layer 102 may be an encapsulation film. The number of layers of the encapsulation film included in the encapsulation layer 102 is not limited. In some embodiments, the encapsulation layer 102 may include one layer of encapsulation film, and may also include two or more layers of encapsulation film disposed in a stacked manner. Illustratively, the encapsulation layer 102 includes three layers of encapsulation films disposed in a sequential stack.

In the case where the encapsulating layer 102 includes three encapsulating films sequentially stacked, the encapsulating film located in the middle layer is made of an organic material, and the encapsulating films located on both sides are made of an inorganic material. The organic material may be, for example, PMMA (Polymethyl methacrylate). The inorganic material may be one or more of SiNx (silicon nitride), SiOx (silicon oxide), or SiOxNy (silicon oxynitride).

In some embodiments, the display panel 1 is a liquid crystal display panel. As shown in fig. 6, the display panel 1 includes: the liquid crystal display panel comprises an ARRAY substrate ARRAY, a color film substrate CF arranged opposite to the ARRAY substrate ARRAY, and a liquid crystal layer LC arranged between the ARRAY substrate ARRAY and the color film substrate CF. The ARRAY substrate ARRAY and the color film substrate CF may be bonded together by the seal SG, so that the liquid crystal layer LC is limited in the region surrounded by the seal SG. The display panel 1 further includes a first polarizer XPL and a second polarizer SPL. The first polarizer XPL is arranged on one side of the ARRAY substrate ARRAY, which is far away from the color film substrate CF; the second polarizer SPL is disposed on a side of the color filter substrate CF away from the ARRAY substrate ARRAY. In order to ensure that the display panel 1 can maintain a certain Cell thickness (Cell Gap) when pressed by an external force, a spacer sp (spacer) is disposed between the ARRAY substrate ARRAY and the color filter substrate CF to form a Gap between the ARRAY substrate ARRAY and the color filter substrate CF, and the liquid crystal layer LC is disposed in the Gap.

As shown in fig. 6, the ARRAY substrate ARRAY includes a substrate SB, and thin film transistors TFT and pixel electrodes PD arranged in an ARRAY on the substrate SB. The thin film transistors TFT correspond to the pixel electrodes PD one to one. There are various types of thin film transistors TFTs. It should be understood that the thin film transistor TFT may be an N-type thin film transistor or a P-type thin film transistor. The thin film transistor TFT described above employs a bottom gate structure, which is the same as the structure of the TFT shown in fig. 4, and thus the same reference numerals are used, and will not be described again here. In some embodiments, the thin film transistor TFT may also adopt a top gate structure, which may be referred to in fig. 3.

A protective layer PL is formed above the source-drain metal pattern layer SD and the pixel electrode layer (including the plurality of pixel electrodes PD). The pixel electrode PD is connected to the drain electrode 1014 in the source-drain metal pattern layer SD, and a signal trace (e.g., a data line DL) shown in fig. 6 is connected to the source electrode 1013 in the source-drain metal pattern layer SD. It should be understood that the pixel electrode PD may also be connected to the source 1013 and the signal trace may also be connected to the drain 1014.

As shown in fig. 6, the color filter substrate CF includes a color filter layer. The color film layer includes a black matrix BM and a plurality of color resistors SZ formed in the black matrix BM, the plurality of color resistors SZ forming a color resistor array. The color resistors SZ at least comprise a red color resistor, a green color resistor and a blue color resistor; the red color resistor, the green color resistor and the blue color resistor are respectively opposite to the sub-pixel areas on the ARRAY substrate ARRAY one by one. The black matrix BM serves to separate the red color resists, the green color resists, and the blue color resists to prevent light emitted from adjacent subpixel regions from crosstalk with each other. It should be understood that the color film layer (including the black matrix BM and the plurality of color resistors SZ) may be disposed in the ARRAY substrate ARRAY, and in this case, the color film substrate CF shown in fig. 6 may be replaced by an opposite substrate without the color film layer.

It should be understood that, in order to control the turn-off and turn-on of the respective thin film transistors TFT, as shown in fig. 7, the ARRAY substrate ARRAY further includes a plurality of gate lines GL and a plurality of data lines DL. The plurality of gate lines GL and the plurality of data lines DL are crossed but not electrically connected to define a plurality of sub-pixel regions arranged in an array, and the thin film transistors TFT and the pixel electrodes PD arranged in an array are located in the plurality of sub-pixel regions arranged in an array in a one-to-one correspondence. Each gate line GL is connected to a gate electrode 1012 of a row of thin film transistors TFT, and each data line DL is connected to a source electrode 1013 or a drain electrode 1014 of a column of thin film transistors TFT.

The color filter substrate CF further has a common electrode COM on a side close to the liquid crystal layer LC, and when the thin film transistors TFT are turned on, a vertical electric field is formed between the common electrode COM and the pixel electrodes PD, so that liquid crystal molecules in the liquid crystal layer LC are deflected, thereby changing light passing through the display panel 1. Note that the common electrode COM may be disposed on the ARRAY substrate ARRAY to form a horizontal electric field together with the pixel electrode PD.

In order to realize various functions of the intelligent terminal, such as photographing, face recognition, illumination, and the like, various electronic components, such as a rear camera, an infrared sensor, a light emitting diode, and the like, need to be mounted on the portable intelligent terminal. In order to reduce the space as much as possible and to meet the requirement of miniaturization of the portable intelligent terminal, electronic components such as a rear camera, an infrared sensor, and a light emitting diode are currently disposed on the non-display side of the display panel 1. The protective film 2 is provided on the non-display side of the display panel 1, and can achieve good buffering, heat dissipation and light shielding effects for the display panel 1001 and various electronic components. When the protective film 2 is attached to the non-display side of the display panel 1, the openings in the protective film 2 are fitted to the respective electronic components. That is, the protective film 2 includes a plurality of openings, for example, two openings 201 shown in fig. 9A and 9B. When the protective film 2 is attached, each electronic component is fitted in a corresponding opening.

In the transportation and storage process before the display module 1001 assembles into the complete machine of the portable intelligent terminal 1000, the protection film 2 can play better buffering, heat dissipation and shading effects to the display module 1001. When the protective film 2 is attached to the non-display side of the display panel 1, the opening of the protective film 2 is aligned with various electronic components on the non-display side of the display panel 1, so that the protective film 2 is integrally attached in place. For example, the protective film 2 is adhered to the lower side of the display panel 1 shown in fig. 3, 4, and 6 at the time of assembly. The non-display side of the display panel 1 is the side opposite to the display side thereof, and the display side can display, for example, characters, images, video, and the like. As shown in fig. 8, in some embodiments, the protective film 2 includes an adhesive layer 21, a buffer layer 22, and a metal layer 23, which are sequentially disposed away from the display panel 1.

In some embodiments, the material of the adhesive layer 21 is black cross-hatched glue. By the arrangement, the bonding layer 21 can be connected with the display panel 1 and the buffer layer 22 more tightly, so that the bonding layer 21 and the buffer layer 22 can be better fixed on the display panel 1, and a better buffering and shading effect can be achieved.

In some embodiments, the material of cushioning layer 22 is foam. The foam is light in weight and elastic, and can protect the display panel 1 and the circuit structure below the display panel 1, for example, when the display panel 1 is subjected to a large acting force, the display panel 1 is not easy to damage because the non-display side of the display panel 1 is not directly contacted with a rigid component, and meanwhile, the circuit structure below the display panel 1 cannot be damaged due to extrusion of the display panel 1.

In some embodiments, metal layer 23 comprises a copper layer. The material of the copper layer can be a copper simple substance or a copper alloy. By doing so, the heat dissipation effect of the protective film 2 can be improved, enabling the heat on the display panel 1 to be dissipated more quickly.

In order to improve space efficiency, a plurality of openings having the same size and shape are provided at the same position on the adhesive layer 21, the buffer layer 22, and the metal layer 23. For example, the two openings 201 are the same size for each layer in the protective film 2. However, when the sizes of the respective layers in the protective film 2 are uniform for each opening, due to the lack of the buffer protection effect of the adhesive layer 21 and the buffer layer 22, when the protective film 2 is adhered to the non-display side of the display panel 1, the electronic component may directly contact the display panel 1, with the risk of damaging the display panel 1.

In some implementations, in order to reduce the risk of damage to the display panel 1, some adhesive layer 21 and buffer layer 22 are usually left at the opening, i.e. the size of the opening is different in the protection film 2. As shown in fig. 10A and 10B, for example, the metal layer 23 includes a first opening 28, and the adhesive layer 21 and the buffer layer 22 collectively include two second openings 29. The first opening 28 exposes two second openings 29. For example, the orthographic projection of the edge of the first opening 28 on the display panel 1 is located outside the orthographic projection of the edge of each of the second openings 29 on the display panel 1. At this time, the orthographic projection of the edge of each second opening 29 on the display panel 1 and the orthographic projection of the edge of each first opening 28 on the display panel 1 may not coincide completely or may partially coincide. It will be appreciated that the area of the first opening 28 should be greater than the area of each second opening 29. In the case where a plurality of electronic components are provided, a plurality of second openings 29 may correspond to one first opening 28, as shown in fig. 10B; one second opening 29 may also correspond to one first opening 28.

It will be appreciated that the sub-openings in the adhesive layer 21 and the buffer layer 22 together constitute the second opening 29 described above. In some examples, an orthographic projection of the second opening 29 on the display panel 1 at the edge of the adhesive layer 21 and an orthographic projection of the second opening 29 on the display panel 1 at the edge of the buffer layer 22 coincide. Of course, in other examples, it may be provided that the two are not completely overlapped, and it is only necessary to ensure that the orthographic projection of the edge of the first opening 28 of the metal layer 23 on the display panel 1 is located outside the orthographic projection of the edge of the sub-opening of the adhesive layer 21 on the display panel 1, and the orthographic projection of the edge of the first opening 28 of the metal layer 23 on the display panel 1 is located outside the orthographic projection of the edge of the sub-opening of the buffer layer 22 on the display panel 1. The utility model discloses do not restrict this.

Due to the arrangement, on one hand, different electronic components can be embedded into the second openings 29 corresponding to the protective films 2 when being aligned, and the space utilization rate is improved; on the other hand, the adhesive layer 21 and the buffer layer 22 reserve a certain area of buffer material, thereby protecting the display panel 1 from damage.

It should be noted that, although the metal layer 23 is provided with the larger first opening 28 and the adhesive layer 21 and the buffer layer 22 are provided with the smaller second opening 29, respectively, the adhesive layer 21 and the buffer layer 22 have lower strength than the metal layer 23, and the non-overlapping portion of the first opening 28 and the second opening 29 is not supported by the metal layer 23, as shown in fig. 11A and 11B, when the protective film 2 is adhered to the display panel 1, the non-overlapping portion is easily deformed such as wrinkles. Further, pressure of a roller (when the protective film 2 is adhered to the display panel 1, the protective film 2 is generally pressed by the roller to adhere the protective film 2 to the display panel 1) cannot be applied to the non-overlapping portion, so that the non-overlapping portion cannot be closely attached to the display panel 1, thereby causing a risk of poor appearance and damage to the display panel 1.

Some embodiments of the present invention provide a protective film 2, as shown in fig. 12A and 12B, the protective film 2 further including a filler pad 26. As shown in fig. 13A and 13B in conjunction, the filling pad 26 is disposed in the first opening 28, and the orthogonal projection of the edge of the filling pad 26 on the display panel 1 is located outside the orthogonal projection of the edge of each second opening 29 on the display panel 1. The filling pad 29 is made of white opaque material.

Due to the supporting function of the filling pad 26, when the protective film 2 is adhered to the display panel 1, the adhesive layer 21 and the buffer layer 22 are slightly undulated or do not undulate; after the adhesive layer 21 is attached to the display panel 1, due to the existence of the filling gasket 26, the pressure of the roller pressing the protection film 2 can be transmitted to the adhesive layer 21 and the buffer layer 22 through the filling gasket 26, so that the adhesive layer 21 and the buffer layer 22 are tightly attached to the non-display side of the display panel 1, and the phenomenon of poor appearance is avoided.

In some embodiments, the material of the filler pad 26 is PET (polyethylene terephthalate). PET is a milky white or pale yellow highly crystalline polymer with a smooth and glossy surface. The dimensional stability is good, and the influence of temperature is small.

Since the thickness of the metal layer 23 is usually 65 μm, the thickness of the filling pad 26 may be 50 to 65 μm. Illustratively, the thickness of the filler pad 26 is 50 μm, 55 μm, 60 μm, 65 μm.

In some embodiments, the orthographic projection of the filling pad 26 on the display panel 1 is located inside the orthographic projection of the edge of the first opening of the metal layer 23 on the display panel 1. The distance between the edge of the filling pad 26 and the edge of the first opening may be 0.4mm-0.6 mm. Illustratively, the distance between the two is 0.4mm, 0.5mm, 0.6 mm.

In some embodiments, the shortest distance from each point in the orthographic projection of the edge of each second opening 29 on the display panel 1 to the orthographic projection of the edge of the first opening 28 on the display panel 1 is 0.4mm to 1.8 mm. That is, the shortest distance from each point of the edge of each second opening 29 in the orthographic projection of the plane on which the protective film 2 is located to the orthographic projection of the edge of the first opening 28 in the plane on which the protective film 2 is located is 0.4mm to 1.8 mm. For example, the shortest distance is 0.4mm, 0.6mm, 1.0mm, 1.4mm, 1.7mm, 1.8mm, or the like. The plane of the protective film 2 is parallel to the display panel 1 and perpendicular to the thickness direction of the protective film 2. Here, the shape of each second opening 29 may be substantially the same as or different from the shape of the first opening 28. Where "substantially the same" means that the shapes of both may be identical, or the shape of one of the two may be a shape that is similar to the other shape as a whole.

It should be noted that the adhesive layer 21 and the buffer layer 22 having the second opening 29 can be directly obtained by cutting the adhesive layer 21 and the buffer layer 22 through a die cutting process. Similarly, the metal layer 23 having the first opening 28 can be directly obtained by cutting the metal layer 23 through a die cutting process.

In some embodiments, as shown in fig. 14, the protection film 2 further includes a release film 25, and the release film 25 is attached on the surface of the adhesive layer 21. When it is necessary to adhere the protective film 2 to the non-display side of the display panel 1, the release film 25 is peeled off so that the adhesive layer 21 is exposed, and the adhesive layer 21 is attached to the non-display side of the display panel 1. The release film 25 can ensure that the protective film 2 is prevented from being polluted or damaged in the process of transportation and storage.

In some embodiments, as shown in fig. 14, the protective film 2 further includes a protective glue layer 24. For example, the protective adhesive layer 24 is a PET adhesive layer, and an adhesive surface of the PET adhesive layer is attached to a surface of the metal layer 23 on a side away from the buffer layer 2. The PET glue layer can protect the metal layer 23. Moreover, when the protection film 2 includes the filling pad 26, the adhesive surface of the PET adhesive layer is also attached to the surface of the filling pad 26 on the side away from the buffer layer 22. And one side (non-adhesive surface) of the PET adhesive layer far away from the metal layer 23 is subjected to anti-sticking treatment, so that foreign matters such as dust are prevented from being adhered in the transportation and use processes. The PET glue layer is transparent. The utility model discloses the colour to the PET glue film does not restrict.

It should be noted that, because the filling pad 26 is attached to the adhesive surface of the PET adhesive layer and disposed in the first opening 28, although the filling pad 26 enhances the overall shading effect of the PET adhesive layer to a certain extent, due to the existence of the attachment tolerance, when the filling pad 26 is attached to the side, there is a risk of light leakage, and light can directly irradiate the non-display side of the display panel 1 through the PET adhesive layer, so that there is a risk of uneven brightness of the display panel 1.

Accordingly, in some embodiments, as shown in fig. 15, the protective film 2 further includes a light shielding layer 27. The light shielding layer 27 is on the side of the protective adhesive layer 24 away from the filling pad 26. As shown in fig. 15, the orthographic projection of the light shielding layer 27 on the display panel 1 is located outside the orthographic projection of the first opening 28 on the display panel 1. In this case, the orthographic projection of the edge of the light shielding layer 27 on the display panel 1 and the orthographic projection of the edge of the first opening 28 on the display panel 1 may not overlap each other at all, or may overlap each other partially. It is understood that the area of the light shielding layer 27 should be larger than the area of the first opening 28. The light shielding layer 27 is made of a black opaque material to prevent the uneven brightness of the display panel 1 caused by the light emitted through the first opening 28 to the non-display side of the display panel 1 when the filling pad 26 is attached to the display panel 1 after the protective film 2 is attached to the display panel 1.

Before assembling into portable intelligent terminal 1000's complete machine with display module 1001, need paste the whole non-display side of display panel 1 with protection film 2 to each electronic components who protects display panel 1 non-display side does not receive the damage in transportation and storage process, has also protected display panel 1 and the circuit structure of display panel 1 below simultaneously and can not damage because of the extrusion. The specific sticking steps of the protective film 2 are as follows: firstly, the release film 25 is torn off to expose the adhesive layer 21, and the adhesive layer 21 is attached to the non-display side of the display panel 1 by using a roller to complete the embedding of the electronic component and the corresponding second opening 29 on the protective film 2; then, the light shielding layer 27 and the protective adhesive layer 24 are torn off, and the filling pad 26 is attached to the adhesive surface of the protective adhesive layer 24, and is removed together with the tearing off of the protective adhesive layer 24. At this time, the metal layer 23, the buffer layer 22, and the adhesive layer 21 are left stuck in place. The filling sheet 26, the protective adhesive layer 24, and the light-shielding layer 27 serve only as intermediate products, and serve to shield light and ensure good appearance during transportation and storage.

With this arrangement, the light shielding layer 27 can effectively prevent light from irradiating the non-display side of the display panel 1 through the first opening 28, thereby avoiding the risk of uneven brightness of the display panel 1.

In some embodiments, the shortest distance from each point in the orthographic projection of the edge of the light shielding layer 27 on the display panel 1 to the orthographic projection of the edge of the first opening 28 on the display panel 1 is 0.3mm to 0.8 mm. For example, the shortest distance is 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, or the like. The shape of the light-shielding layer 27 may be substantially the same as or different from the shape of the first opening 28. Where "substantially the same" means that the shapes of both may be identical, or the shape of one of the two may be a shape similar to the other shape as a whole.

The embodiment of the utility model provides a protection film 2 owing to add packing pad 26, can effectively prevent to take place the outward appearance that the fold leads to because of adhesive linkage 21 and buffer layer 22 bad.

The embodiment of the utility model provides a protection film 2 owing to add light shield layer 27, can effectively avoid light to shine display panel 1's non-display side through first opening 28, avoids taking place display panel 1 inhomogeneous risk of luminance.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can think of the changes or substitutions within the technical scope of the present invention, and all shall be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (15)

1. A protective film, comprising:

a metal layer including a first opening;

the buffer layer and the bonding layer are sequentially arranged on one side of the metal layer, the buffer layer and the bonding layer jointly comprise one or more second openings, and the orthographic projection of the edge of the first opening on the plane of the protective film is positioned outside the orthographic projection of the edge of each second opening on the plane of the protective film;

the filling gasket is arranged in the first opening, and the orthographic projection of the edge of the filling gasket on the plane of the protective film is positioned outside the orthographic projection of the edge of each second opening on the plane of the protective film.

2. The protective film according to claim 1,

the plane of the protective film is perpendicular to the thickness direction of the protective film.

3. The protective film according to claim 1,

the shortest distance from each point of the edge of each second opening in the orthographic projection of the plane of the protective film to the orthographic projection of the edge of each first opening in the plane of the protective film is 0.4-1.8 mm.

4. The protective film according to any one of claims 1 to 3,

the orthographic projection of the edge of the buffer layer on the plane of the protective film is superposed with the orthographic projection of the edge of the adhesive layer on the plane of the protective film.

5. The protective film according to any one of claims 1 to 3,

the filling gasket is made of white and opaque materials.

6. The protective film according to any one of claims 1 to 3,

the orthographic projection of the edge of the buffer layer on the plane of the protective film does not coincide with the orthographic projection of the edge of the adhesive layer on the plane of the protective film, and each second opening comprises a sub-opening on the adhesive layer and a sub-opening on the buffer layer;

the orthographic projection of the edge of the first opening on the plane of the protective film is positioned outside the orthographic projection of the edge of the sub-opening of the adhesive layer on the plane of the protective film, and the orthographic projection of the edge of the first opening on the plane of the protective film is positioned outside the orthographic projection of the edge of the sub-opening of the buffer layer on the plane of the protective film.

7. The protective film according to any one of claims 1 to 3,

the material of the filling gasket is polyethylene terephthalate.

8. The protective film according to any one of claims 1 to 3,

the thickness range of the filling gasket is 50-65 μm.

9. The protective film according to any one of claims 1 to 3,

the orthographic projection of the filling gasket on the plane of the protective film is positioned on the inner side of the orthographic projection of the edge of the first opening on the plane of the protective film.

10. The protective film according to claim 9,

the distance between the edge of the filling gasket and the edge of the first opening ranges from 0.4mm to 0.6 mm.

11. The protective film according to any one of claims 1 to 3, further comprising:

and the release film is attached to the surface of one side, far away from the buffer layer, of the adhesive layer.

12. The protective film according to claim 11, further comprising:

and the protective adhesive layer is attached to the surface of one side, away from the buffer layer, of the filling gasket.

13. The protective film according to claim 12,

the protective adhesive layer is a transparent protective adhesive layer.

14. The protective film of claim 12, further comprising,

and the light shielding layer is arranged on one side, far away from the filling gasket, of the protective adhesive layer.

15. A display module, comprising:

a display panel; and the number of the first and second groups,

the protective film according to any one of claims 1 to 14, wherein the adhesive layer is connected to a non-display side of the display panel.

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