Impact protection layer, control method, device, display module and terminal

Abstract

The embodiments of the present application provide an impact protection layer, a control method, a device, a display module and a terminal, which relate to the field of display technology and can improve the impact resistance or bendability in different scenarios to provide more reliable protection for the display module. The impact protection layer is used for the display module, and the impact protection layer includes: a first transparent electrode layer, an electro-enhanced layer and a second transparent electrode layer stacked, the electro-enhanced layer is located between the first transparent electrode layer and the second transparent electrode layer, the electro-enhanced layer is a transparent film layer, and the Young's modulus of the electro-enhanced layer is positively correlated with the electric field strength passing through the electro-enhanced layer.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to an impact protection layer, a control method, a device, a display module, a preparation method of an electroenhancement layer, and a terminal. Background Art

[0002] With the development of display technology, in order to make the terminal have a larger display area and occupy a smaller physical space, terminals with foldable screens have emerged. The terminal has a backplane for supporting the display module. However, for a foldable display module, the impact resistance and bendability of the backplane are contradictory. The bendability requires a low Young's modulus and easy bending and deformation; while the impact resistance requires a high Young's modulus, high yield strength, and not easy to deform. Therefore, for a terminal with a foldable screen, making the backplane easy to bend while improving the impact resistance is a problem to be solved. Summary of the invention

[0003] An impact protection layer, a control method, a device, a display module, a method for preparing an electroenhanced layer, and a terminal can improve the impact resistance or bendability in different scenarios to provide more reliable protection for the display module.

[0004] In a first aspect, an impact protection layer is provided for a display module, the impact protection layer comprising: a first transparent electrode layer, an electroenhanced layer, and a second transparent electrode layer which are stacked, the electroenhanced layer being located between the first transparent electrode layer and the second transparent electrode layer, the electroenhanced layer being a transparent film layer, and the Young's modulus of the electroenhanced layer being positively correlated with the electric field strength passing through the electroenhanced layer.

[0005] In a possible implementation manner, the electroenhancement layer is a silicon dioxide material layer.

[0006] In a possible implementation, the electroenhancement layer includes a transparent substrate and electroenhancement particles attached to the surface of the transparent substrate, the electroenhancement particles are nanospheres, nanotubes or graphene aerogels, and the nanospheres or nanotubes are silicon dioxide or graphene materials.

[0007] In a possible implementation, the electro-enhancement layer is made of a mixed material of a transparent substrate and electro-enhancement fibers, and the electro-enhancement fibers are made of silicon dioxide or graphene.

[0008] In a possible implementation, any one of the first transparent electrode layer and the second transparent electrode comprises a transparent substrate and a conductive grid attached to a surface of the transparent substrate;

[0009] The conductive mesh is any one of metal, graphene, carbon nanotube, carbon fiber and conductive polymer.

[0010] In a possible implementation, the transparent substrate is a cycloolefin polymer material, a polyimide material, a polyethylene terephthalate material or a triacetate cellulose film.

[0011] In a second aspect, a method for controlling an impact protection layer is provided for a terminal, the terminal comprising the impact protection layer of the first aspect, the method for controlling the impact protection layer: periodically determining whether the terminal is in a falling state, if so, applying different voltages to the first transparent electrode layer and the second transparent electrode layer in the impact protection layer, respectively, so that an electric field is generated between the first transparent electrode layer and the second transparent electrode layer in the impact protection layer due to the voltage difference, if not, stopping applying different voltages to the first transparent electrode layer and the second transparent electrode layer in the impact protection layer, respectively, so that an electric field is not generated between the first transparent electrode layer and the second transparent electrode layer in the impact protection layer due to the voltage difference.

[0012] In a possible embodiment, the impact protection layer control method also includes: periodically determining whether the terminal is in a flattened state, and if so, applying different voltages to the first transparent electrode layer and the second transparent electrode layer in the impact protection layer, respectively, so that an electric field is generated between the first transparent electrode layer and the second transparent electrode layer in the impact protection layer due to the voltage difference; if not, stopping applying different voltages to the first transparent electrode layer and the second transparent electrode layer in the impact protection layer, respectively, so that an electric field is not generated between the first transparent electrode layer and the second transparent electrode layer in the impact protection layer due to the voltage difference.

[0013] In a third aspect, an impact protection layer control device is provided, comprising: a processor and a memory, the memory being used to store at least one instruction, and the instruction is loaded and executed by the processor to implement the impact protection layer control method of the second aspect.

[0014] In a fourth aspect, a display module is provided, comprising: a display panel and an impact protection layer which are stacked, wherein the impact protection layer is the impact protection layer of the first aspect.

[0015] In a possible embodiment, the display module further includes: a circular polarizer and a cover plate, the circular polarizer is located between the cover plate and the display panel, and the impact protection layer is located between the circular polarizer and the display panel; the cover plate includes a protective layer and a hard coating layer, and the protective layer is located between the hard coating layer and the circular polarizer.

[0016] In a possible implementation, the display module further includes: a circular polarizer and a hard coating layer, the circular polarizer is located between the hard coating layer and the display panel, and the impact protection layer is located between the circular polarizer and the hard coating layer.

[0017] In a possible implementation, the impact protection layer includes a first impact protection layer and a second impact protection layer, the first impact protection layer is located between the circular polarizer and the hard coating layer, and the second impact protection layer is located on a side of the display panel away from the hard coating layer.

[0018] In a fifth aspect, a terminal is provided, comprising: the display module of the fourth aspect; and the impact protection layer control device of the third aspect.

[0019] In a sixth aspect, a method for preparing an electroenhanced layer is provided, comprising: dissolving 1,1-bis(p-chlorophenyl)-2,2-dichloroethylene in N,N-dimethylacetamide to form a solution; adding pyromellitic anhydride to the solution and stirring to form a polyacrylic acid solution; adding tetraethoxysilane to the polyacrylic acid solution and stirring to form a polyimide precursor; coating the polyimide precursor on the surface of a silicon dioxide layer, and imidizing the polyimide precursor coated on the surface of the silicon dioxide to form a composite film layer of polyimide and silicon dioxide.

[0020] Impact protection layer, control method, device, display module, preparation method of electroenhancement layer and terminal, by setting two transparent electrode layers and electroenhancement layer located between the two, because the electroenhancement layer has the characteristic that Young's modulus is positively correlated with the electric field strength passing through it, when the terminal is in a falling state, the Young's modulus of the electroenhancement layer can be increased by providing a voltage difference to the two transparent electrode layers to improve the impact resistance of the impact protection layer; when the terminal is in a non-falling state, the bendability of the impact protection layer is improved by not providing a voltage difference to the two transparent electrode layers. That is, by improving the impact resistance or bendability in different scenarios, more reliable protection is provided for the display module. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a cross-sectional structure of a display module;

[0022] Figure 2 is a schematic diagram of a cross-sectional structure of another display module;

[0023] Figure 3 This is a schematic diagram of the structure of an impact protection layer in an embodiment of the present application;

[0024] Figure 4 This is a schematic diagram of a structure including an impact protection layer and an impact protection layer control device in an embodiment of the present application;

[0025] Figure 5 A schematic diagram of a voltage signal applied to the first transparent electrode layer and the second transparent electrode layer in an embodiment of the present application;

[0026] Figure 6 This is a schematic diagram of the structure of a conductive grid in an embodiment of the present application;

[0027] Figure 7 This is a schematic diagram of the structure of another conductive grid in an embodiment of the present application;

[0028] Figure 8 This is a flow chart of a method for controlling an impact protection layer in an embodiment of the present application;

[0029] Fig. 9 This is a flow chart of another method for controlling an impact protection layer in an embodiment of the present application;

[0030] Fig.10 This is a schematic diagram of the structure of a display module in an embodiment of the present application;

[0031] Fig.11 This is a schematic diagram of the structure of another display module in an embodiment of the present application;

[0032] Fig.12 This is a schematic diagram of the structure of another display module in an embodiment of the present application;

[0033] Fig.13 It is a decomposition diagram of a display module manufacturing process in an embodiment of the present application;

[0034] Fig.14 This is a schematic diagram of the structure of another display module in an embodiment of the present application;

[0035] Fig.15 This is a schematic diagram of the structure of a terminal in an embodiment of the present application. DETAILED DESCRIPTION

[0036] The terms used in the implementation section of this application are only used to explain the specific embodiments of this application and are not intended to limit this application.

[0037] Before introducing the embodiments of the present application, the discovery process of the technical solution of the present application is first described. For a foldable display module, bendability and impact resistance are a pair of contradictions. The higher the Young's modulus of the protective film layer in the display module, the better the impact resistance, and it is not easy to produce creases when bending, but the bending stress is large, that is, the bendability is poor; conversely, the lower the Young's modulus, the better the bendability, and it is easy to bend, but the impact resistance is poor. The display module can use polyimide to achieve the protection of the display panel, such as Figure 1As shown, the display module includes a cover plate 01 and a display panel 02, wherein the cover plate 01 is composed of a hard coating layer 011 and a polyimide layer 012. The polyimide layer 012 has a low Young's modulus and good bendability, but poor impact resistance. It is difficult to provide sufficient protection under impact, which can easily cause the display panel 02 to crack and produce bright spots, black spots and other display defects. In addition, the display module can also use ultra-thin glass (UTG) to protect the display panel, such as Figure 2 As shown, the display module includes a cover plate 01 and a display panel 02, wherein the cover plate 01 includes a hard coating layer 011, a polyimide layer 012, an ultra-thin glass layer 013 and a polyester resin layer 014 in sequence, the polyimide layer 012 can be bonded to the ultra-thin glass layer 013 through an adhesive layer 015, and the ultra-thin glass layer 013 can be bonded to the polyester resin layer 014 through an adhesive layer 015. Since the cover plate 01 includes the ultra-thin glass layer 013, it has a higher Young's modulus and good impact resistance, but has a large bending stress, that is, poor bending performance, is not easy to bend, and is prone to brittle fracture under impact. In view of the above problems, the technical solution of the present application is proposed, and the technical solution of the present application is explained below.

[0038] The present application embodiment provides an impact protection layer for a display module, such as Figure 3 As shown, the impact protection layer 1 includes: a first transparent electrode layer 11, an electroenhanced layer 10 and a second transparent electrode layer 12 which are stacked, the electroenhanced layer 10 is located between the first transparent electrode layer 11 and the second transparent electrode layer 12, the electroenhanced layer 10 is a transparent film layer, and the Young's modulus of the electroenhanced layer 10 is positively correlated with the electric field strength passing through the electroenhanced layer 10.

[0039] Specifically, Figure 3 and Figure 4As shown, the impact protection layer 1 is used to be set in the display module of the terminal to realize impact protection of the display module. When in use, the impact protection layer 1 needs to be used in conjunction with the impact protection layer control device 20. The impact protection layer control device 20 can specifically be a power management chip in the terminal. The first transparent electrode layer 11 and the second transparent electrode layer 12 are respectively electrically connected to the two power pins of the impact protection layer control device 20. For example, the positive pole of the power pin in the impact protection layer control device 20 is electrically connected to the first transparent electrode layer 11, and the negative pole of the power pin in the impact protection layer control device 20 is electrically connected to the second transparent electrode layer 12. The electroenhanced layer 10 has electroenhanced characteristics, that is, the electroenhanced layer 10 has a lower Young's modulus in the absence of an electric field, for example, a Young's modulus in the range of [10Mpa, 500Mpa]. Under the action of an electric field, the Young's modulus of the electroenhanced layer 10 increases according to a functional relationship as the electric field strength penetrating the electroenhanced layer 10 increases. The functional relationship is related to the actual material. For example, for every increase of 1V / cm in the electric field strength, the Young's modulus increases in the range of [0.1Gpa, 5Gpa]. That is, the Young's modulus of the electroenhanced layer 10 is positively correlated with the electric field strength passing through the electroenhanced layer 10.

[0040] For example, as shown in Table 1, Table 1 illustrates the Young's modulus of the electrically enhanced layer 10 made of silicon dioxide under different electric field strengths. It can be seen that the Young's modulus of silicon dioxide increases by 1 GPa for every increase in the electric field strength of 1 V / cm.

[0041] Table 1

[0042] Electric field strength (unit: kV / cm) Young's modulus (unit: GPa) 0 55.1 54.5 113.4 109 156.1

[0043] The impact protection layer control device 20 provides a voltage difference for the first transparent electrode layer 11 and the second transparent electrode layer 12 in response to corresponding instructions. The first transparent electrode layer 11 and the second transparent electrode layer 12 will generate an electric field passing through the electro-enhanced layer 10 under the action of the voltage difference, so as to achieve different Young's modulus of the electro-enhanced layer 10 in different scenarios. For example, when it is determined that the terminal is in a falling state, it is necessary to protect the display module from the impact of external forces when falling. At this time, the impact protection layer control device 20 can provide different voltage values ​​to the first transparent electrode layer 11 and the second transparent electrode layer 12 respectively according to the instruction that the terminal is in a falling state, so that there is a voltage difference between the two, thereby generating an electric field, so that the electroenhanced layer 10 has a larger Young's modulus to improve the impact resistance; when it is determined that the terminal is in a non-falling state, at this time, the impact protection layer control device 20 can control to stop providing different voltage values ​​to the first transparent electrode layer 11 and the second transparent electrode layer 12 according to the instruction that the terminal is in a non-falling state, that is, stop the first transparent electrode layer 11 and the second transparent electrode layer 12 from generating a voltage difference, that is, the first transparent electrode layer 11 and the second transparent electrode layer 12 will not generate an electric field. At this time, the electroenhanced layer 10 has a smaller Young's modulus and a smaller bending stress, that is, it has better bending performance and is easy to bend, thereby facilitating the realization of the bending function of the display module. The role of the impact protection layer 1 is explained below through two specific examples. Figure 3 , Figure 4 and Figure 5 As shown in the figure, when it is determined that the terminal is in a non-falling state, the impact protection layer control device 20 does not energize the first transparent electrode layer 11 and the second transparent electrode layer 12, that is, no electric field is generated between the two, and the electro-enhancement layer 10 has a lower Young's modulus and better bending performance; when the terminal falls, the terminal will be in a falling state within a range of, for example, 0.1 to 5s. At the beginning of the terminal falling, it is determined that the terminal is in a falling state. At this time, the impact protection layer control device 20 provides a high voltage square wave in the range of 100 to 300V to the first transparent electrode layer 11 and provides a high voltage square wave in the range of 100 to 300V to the second transparent electrode layer 12. A low voltage square wave in the range of -100 to -300V is supplied, so that there is a voltage difference in the range of 200 to 600V between the first transparent electrode layer 11 and the second transparent electrode layer 12, so that an electric field is generated between the two, and the electro-enhancement layer 10 has a higher Young's modulus and poorer bending performance; from the moment when the terminal falls off, the terminal is in a non-falling state, and the impact protection layer control device 20 does not energize the first transparent electrode layer 11 and the second transparent electrode layer 12, that is, no electric field is generated between the two, and the electro-enhancement layer 10 has a lower Young's modulus and better bending performance. Figure 3 and Figure 4As shown, the impact protection layer control device 20 can also always ground the second transparent electrode layer 12. When it is determined that the terminal is in a falling state, the impact protection layer control device 20 provides a high voltage square wave in the range of 100 to 300V to the first transparent electrode layer 11, even if there is a voltage difference in the range of 100 to 300V between the first transparent electrode layer 11 and the second transparent electrode layer 12, so that an electric field is generated between the two, and the electroenhanced layer 10 has a higher Young's modulus and poorer bending performance; when it is determined that the terminal is in a non-falling state, the impact protection layer control device 20 stops energizing the first transparent electrode layer 11, that is, no electric field is generated between the two, and the electroenhanced layer 10 has a lower Young's modulus and better bending performance.

[0044] The impact protection layer in the embodiment of the present application is provided with two transparent electrode layers and an electroenhanced layer located therebetween. Since the electroenhanced layer has the characteristic that the Young's modulus is positively correlated with the electric field strength passing through it, the Young's modulus of the electroenhanced layer can be increased by providing a voltage difference to the two transparent electrode layers when the terminal is in a falling state, so as to improve the impact resistance of the impact protection layer; when the terminal is in a non-falling state, the bendability of the impact protection layer can be improved by not providing a voltage difference to the two transparent electrode layers. That is, by improving the impact resistance or bendability in different scenarios, more reliable protection can be provided to the display module.

[0045] In a possible implementation, the electroenhancement layer 10 is a silicon dioxide material layer, that is, the electroenhancement layer 10 can be made of a homogeneous single material. The electroenhancement layer 10 made of this single material is the first electroenhancement layer 10 provided in the embodiment of the present application.

[0046] In a possible embodiment, the electroenhanced layer 10 includes a transparent substrate and electroenhanced particles attached to the surface of the transparent substrate, the electroenhanced particles are nanospheres, nanotubes or graphene aerogels, the nanospheres or nanotubes are silica or graphene materials, and the composite film layer obtained by stacking two material film layers is the second electroenhanced layer 10 provided in the embodiment of the present application.

[0047] In a possible embodiment, the electroenhancement layer 10 is made of a mixed material of a transparent substrate and electroenhancement fibers, and the electroenhancement fibers are made of silicon dioxide or graphene. The composite film layer obtained by mixing the two materials is the third electroenhancement layer 10 provided in the embodiment of the present application.

[0048] In a possible implementation, the first transparent electrode layer 11 and the second transparent electrode layer 12 may be homogeneous transparent conductive films, for example, made of indium tin oxide or indium zinc oxide.

[0049] In a possible implementation, any one of the first transparent electrode layer 11 and the second transparent electrode layer 12 includes a transparent substrate and a conductive grid attached to the surface of the transparent substrate; the conductive grid is any one of metal, graphene, carbon nanotubes, carbon fibers and conductive polymers. The conductive grid can be, for example, Figure 6 and Figure 7 Square or diamond shape as shown.

[0050] In a possible implementation, in the above-mentioned second electro-enhancement layer 10 and the third electro-enhancement layer 10, the transparent substrate can be a cycloolefin polymer material (COP), a polyimide (PI) material, a polyethylene terephthalate (PET) material or a triacetyl cellulose (TAC) fiber film.

[0051] like Figure 4 and Figure 8 As shown, the embodiment of the present application also provides a shock protection layer control method for a terminal, the terminal having the shock protection layer 1, and the shock protection layer control method:

[0052] Step S101, periodically determine whether the terminal is in a falling state, if so, proceed to step S102, if not, proceed to step S103;

[0053] Step S102, applying different voltages to the first transparent electrode layer 11 and the second transparent electrode layer 12 in the impact protection layer 1, respectively, so that an electric field is generated between the first transparent electrode layer 11 and the second transparent electrode layer 12 in the impact protection layer 1 due to the voltage difference;

[0054] Step S103 , stop applying different voltages to the first transparent electrode layer 11 and the second transparent electrode layer 12 in the impact protection layer 1 , so that an electric field is not generated between the first transparent electrode layer 11 and the second transparent electrode layer 12 in the impact protection layer 1 due to the voltage difference.

[0055] Specifically, in step S101, whether the terminal is in a falling state can be determined by an acceleration sensor in the terminal. The specific structure and principle of the impact protection layer 1 and the specific process of the impact protection layer control method are the same as those described in the above embodiment and will not be repeated here.

[0056] The impact protection layer control method in the embodiment of the present application is to set two transparent electrode layers and an electroenhanced layer therebetween. Since the electroenhanced layer has the characteristic that the Young's modulus is positively correlated with the electric field strength passing through it, the Young's modulus of the electroenhanced layer can be increased by providing a voltage difference to the two transparent electrode layers when the terminal is in a falling state, so as to improve the impact resistance of the impact protection layer; when the terminal is in a non-falling state, the bendability of the impact protection layer can be improved by not providing a voltage difference to the two transparent electrode layers. That is, by improving the impact resistance or bendability in different scenarios, more reliable protection can be provided to the display module.

[0057] In a possible implementation, Figure 4 and Fig. 9 As shown, the impact protection layer control method also includes:

[0058] Step S201, periodically determine whether the terminal is in a flattened state, if so, proceed to step S202, if not, proceed to step S203;

[0059] Step S202, applying different voltages to the first transparent electrode layer 11 and the second transparent electrode layer 12 in the impact protection layer 1, respectively, so that an electric field is generated between the first transparent electrode layer 11 and the second transparent electrode layer 12 in the impact protection layer 1 due to the voltage difference;

[0060] Step S203 , stop applying different voltages to the first transparent electrode layer 11 and the second transparent electrode layer 12 in the impact protection layer 1 , so that an electric field is not generated between the first transparent electrode layer 11 and the second transparent electrode layer 12 in the impact protection layer 1 due to the voltage difference.

[0061] Specifically, the flattened state is a state opposite to the bent state. In the flattened state, the originally folded display module will be flattened to have a larger display plane, so step S202 can be entered to increase the Young's modulus of the electroenhanced layer, so that the impact protection layer is not easily deformed, and can resist the creases and unevenness caused by the micro-displacement of the terminal's central axis in the flattened state, which is conducive to the terminal maintaining a stable flattened state; in the non-flattened state, the display module needs to be folded for use, so step S203 can be entered to improve the bendability of the impact protection layer for easy bending. The specific process and principle of step S202 can be the same as the above-mentioned step S102, and the specific process and principle of step S203 can be the same as the above-mentioned step S103, which will not be repeated here.

[0062] like Figure 4As shown, an embodiment of the present application further provides an impact protection layer control device 20, comprising: a processor and a memory, the memory being used to store at least one instruction, and the instruction is loaded and executed by the processor to implement the above-mentioned impact protection layer control method.

[0063] Among them, the number of processors can be one or more, and the processor and memory can be connected through a bus or other means. The memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer executable programs and modules. The processor executes various functional applications and data processing by running the non-transitory software programs, instructions and modules stored in the memory, that is, implementing the method in any of the above method embodiments. The memory may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; and necessary data, etc. In addition, the memory may include a high-speed random access memory, and may also include a non-transitory memory, such as at least one disk storage device, a flash memory device, or other non-transitory solid-state storage device.

[0064] An embodiment of the present application also provides a computer-readable storage medium, in which a computer program is stored. When the computer-readable storage medium is run on a computer, the computer executes the impact protection layer control method in the above embodiment.

[0065] like Fig.10 As shown, the embodiment of the present application further provides a display module, comprising: a stacked display panel 2 and an impact protection layer 1, wherein the impact protection layer 1 is the impact protection layer 1 in any of the above embodiments. The impact protection layer 1 is used to protect the display panel 2 from adverse effects of impact.

[0066] In a possible implementation, Fig.10 As shown, the display module also includes: a circular polarizer 3 and a cover plate 4, the circular polarizer 3 is located between the cover plate 4 and the display panel 2, and the impact protection layer 1 is located between the circular polarizer 3 and the display panel 2; the cover plate 4 includes a protective layer 41 and a hard coating (Hard Coating, HC) 42, and the protective layer 41 is located between the hard coating 42 and the circular polarizer 3.

[0067] Specifically, Fig.10As shown, the display module may also include: a first adhesive layer 51 located between the cover plate 4 and the circular polarizer 3, so that the cover plate 4 is bonded to the circular polarizer 3 through the first adhesive layer 51; a second adhesive layer 52 located between the circular polarizer 3 and the impact protection layer 1, so that the circular polarizer 3 is bonded to the impact protection layer 1 through the second adhesive layer 52; a display base layer 6, a buffer layer 7 and a back plate 8 located on the side of the display panel 2 away from the cover plate 4, wherein the display base layer 6 is used as a base in the preparation process of the display panel 2, and plays a supporting and buffering role, the buffer layer 7 plays a buffering role, and the back plate 8 plays a supporting and protective role; a third adhesive layer 53 located between the display panel 2 and the display base layer 6, so that the display panel 2 is bonded to the display base layer 6 through the third adhesive layer 53; a fourth adhesive layer 54 located between the display base layer 6 and the buffer layer 7, so that the display base layer 6 is bonded to the buffer layer 7 through the fourth adhesive layer 54; a fifth adhesive layer 55 located between the buffer layer 7 and the back plate 8, so that the buffer layer 7 is bonded to the back plate 8. The display panel 2 is a flexible display panel to achieve a folding function, and the display panel 2 has a touch function in addition to a display function. The first adhesive layer 51 and the second adhesive layer 52 may be optically clear adhesive (OCA), and the third adhesive layer 53, the fourth adhesive layer 54 and the fifth adhesive layer 55 may be pressure sensitive adhesive (PSA). For example, the thickness of the hard coating layer 42 may be 3 μm, the thickness of the protective layer 41 may be 30 to 80 μm, the protective layer 41 may be a polyimide material or ultra-thin glass (UTG), the thickness of the first adhesive layer 51 may be 25 μm, the thickness of the circular polarizer 3 may be 45 μm, the thickness of the second adhesive layer 52 may be 30 μm, the thickness of the first transparent electrode layer 11 may be 5 to 10 μm, the thickness of the electroenhancement layer 10 may be 5 to 20 μm, the thickness of the second transparent electrode layer 12 may be 5 to 10 μm, the thickness of the display panel 2 may be 33 μm, the thickness of the third adhesive layer 53 may be 30 μm, the thickness of the display substrate layer 6 may be 20 μm, the thickness of the fourth adhesive layer 54 may be 15 μm, the thickness of the buffer layer 7 may be 130 μm, the thickness of the fifth adhesive layer 55 may be 5 μm, and the thickness of the backplane 8 may be 30 μm to 50 μm. Fig.10 In the structure shown, the distance between the impact protection layer 1 and the cover plate 4 is relatively large, which can reduce the shielding effect on the touch control.

[0068] In a possible implementation, Fig.11As shown, the display module further includes: a circular polarizer 3 and a hard coating layer 42, wherein the circular polarizer 3 is located between the hard coating layer 42 and the display panel 2, and the impact protection layer 1 is located between the circular polarizer 3 and the hard coating layer 42. The circular polarizer 3 is bonded to the impact protection layer 1 through a first adhesive layer 51, and the circular polarizer 3 is bonded to the display panel 2 through a second adhesive layer 52. The structure and Fig.10 The same, no further elaboration is needed here, that is to say, Fig.11 and Fig.10 In comparison, the impact protection layer 1 replaces the protective layer in the cover plate, that is, the impact protection layer 1 is closer to the hard coating layer 42 on the surface and farther away from the display panel 2. Since the display panel 2 has a touch device, this can reduce the adverse effect of the impact protection layer 1 on the touch noise.

[0069] In a possible implementation, Fig.12 As shown, the display module further includes: a circular polarizer 3 and a hard coating layer 42, wherein the circular polarizer 3 is located between the hard coating layer 42 and the display panel 2, and the impact protection layer 1 is located between the circular polarizer 3 and the hard coating layer 42. A protective layer 41 is further disposed between the hard coating layer 42 and the impact protection layer 1, and a first adhesive layer 51 is disposed between the protective layer 41 and the impact protection layer 1. For other structures, please refer to Fig.11 or Fig.10 The following combination Fig.13 right Fig.12 The display module preparation method is described in detail, and the display module preparation method includes:

[0070] Step S301, manufacturing an impact protection layer 1;

[0071] Step S302, attaching a cover plate 4 on the impact protection layer 1;

[0072] Step S303, manufacturing a display panel 2;

[0073] Step S304, attaching a circular polarizer 3 to the display panel 2;

[0074] Step S305, laminating the impact protection layer 1 and the circular polarizer 3;

[0075] Step S306, attaching a buffer layer 7 and a back plate 8 to a side of the display panel 2 away from the cover plate 4;

[0076] Step S307, bending of a part of the structure is achieved through a pad bending process;

[0077] Step S308: assembling and inspecting.

[0078] It should be noted that in the process of steps S301 to S308, except for the impact protection layer preparation process and related processes in step S301 which are different from the prior art, other steps can be the same as the prior art. The specific structure and principle of the impact protection layer 1 are the same as those in the above embodiment and will not be repeated here.

[0079] In a possible implementation, Fig.14 As shown, the impact protection layer includes a first impact protection layer 1A and a second impact protection layer 1B. The first impact protection layer 1A is located between the circular polarizer 3 and the hard coating layer 42 , and the second impact protection layer 1B is located on the side of the display panel 2 away from the hard coating layer 42 .

[0080] Specifically, Fig.14 As shown, the first impact protection layer 1A and the second impact protection layer 1B have the same structure, both of which have a first transparent electrode layer 11, a second transparent electrode layer 12 and an electroenhancement layer 10 located therebetween. Fig.14 and Fig.11 Similar, the difference is that a second impact protection layer 1B is added, so that the second impact protection layer 1B replaces Fig.11 The buffer layer 7 in the structure can further improve the impact protection effect of the display panel 2 through the two impact protection layers respectively located on both sides of the display panel 2.

[0081] like Fig.15 As shown, an embodiment of the present application also provides a terminal, including: the above-mentioned display module 30; the above-mentioned impact protection layer control device 20, the impact protection layer control device 20 is electrically connected to the first transparent electrode layer 11 and the second transparent electrode layer 12. Among them, the specific structure and principle of the display module 30 and the specific control process of the impact protection layer control device 20 are the same as those in the above-mentioned embodiment, and are not repeated here. The terminal can be any product or component with a display function, such as a display, a mobile phone, a television, a tablet computer, a navigator, a watch, a bracelet, etc. It should also be noted that the display panel in the embodiment of the present application can be a liquid crystal display (Liquid Crystal Display, LCD) panel or an organic light-emitting diode (Organic Light-Emitting Diode, OLED) display panel.

[0082] In a possible implementation, as shown in Table 2, Table 2 illustrates the relationship between the various layers and thicknesses in the preparation process of an electroenhanced layer in an embodiment of the present application. The embodiment of the present application also provides a method for preparing an electroenhanced layer 10, which is used to prepare the above-mentioned first electroenhanced layer 10.

[0083] Table 2

[0084] Overlay Thickness / μm Second layer of OCA (coating) 10 Silicon dioxide film (lamination) 5～10 First layer OCA 10

[0085] The preparation method of the electroenhancement layer 10 shown in Table 2 includes:

[0086] Step S401, laminating a silicon dioxide film on the surface of the first layer of OCA;

[0087] Step S402, coating a second layer of OCA on the surface of the silicon dioxide film away from the first layer of OCA, wherein the coating thickness is greater than the thickness of the silicon dioxide film;

[0088] Step S403, performing a baking and curing process on the structure obtained in step S402 to complete the curing of the second layer of OCA;

[0089] Step S404 , laminating a release film on a side of the first layer of OCA away from the silicon dioxide film, and laminating a release film on a side of the second layer of OCA away from the silicon dioxide film.

[0090] Specifically, the two layers of release films are used to prevent contamination during transportation and other processes. When the silicon dioxide film needs to be used as the electroenhanced layer 10 in the display module, the release film needs to be peeled off first, and then the silicon dioxide film needs to be laminated to the first transparent electrode layer 11 and the second transparent electrode layer 12.

[0091] In a possible implementation, as shown in Table 3, Table 3 illustrates the relationship between the various layers and thicknesses in the preparation process of another electroenhanced layer in an embodiment of the present application. The embodiment of the present application also provides a method for preparing an electroenhanced layer 10, which is used to prepare the above-mentioned third electroenhanced layer 10.

[0092] Table 3

[0093] Overlay Thickness / μm Light release film 10 OCA+Silica Nanotubes 25～50 Heavy release film 10

[0094] The preparation method of the electroenhancement layer 10 shown in Table 3 includes:

[0095] Step S501, mixing silica nanotubes with OCA raw materials to obtain a mixture;

[0096] Step S502, spraying, baking and ripening the mixture obtained in step S501 with the heavy release film as the substrate to form an electro-enhancement layer;

[0097] Step S503 , laminating the light release film to the side of the electro-enhanced layer formed in step S502 away from the heavy release film.

[0098] Specifically, the two release films are used to prevent contamination during transportation and other processes. When the electroenhanced layer needs to be applied in the display module, the release films need to be peeled off first, and then the electroenhanced layer 10 is laminated to the first transparent electrode layer 11 and the second transparent electrode layer 12.

[0099] In a possible implementation, as shown in Table 4, Table 4 illustrates the relationship between the various layers and thicknesses in the preparation process of another electroenhanced layer in an embodiment of the present application. The embodiment of the present application also provides a method for preparing an electroenhanced layer 10, which is used to prepare the above-mentioned second electroenhanced layer 10.

[0100] Table 4

[0101] Overlay Thickness / μm Polyimide Precursor 10～25 Silicon dioxide layer 10

[0102] The preparation method of the electroenhancement layer 10 shown in Table 3 includes:

[0103] Step S601, dissolving 1,1-bis(p-chlorophenyl)-2,2-dichloroethylene in N,N-dimethylacetamide, stirring until fully dissolved to form a solution;

[0104] Step S602, adding pyromellitic anhydride to the solution and stirring until fully dissolved to form a polyacrylic acid solution;

[0105] Step S603, adding tetraethoxysilane to the polyacrylic acid solution and stirring until fully dissolved to form a polyimide precursor;

[0106] Step S604, coating a polyimide precursor on the surface of the silicon dioxide layer, and imidizing the polyimide precursor coated on the silicon dioxide surface in an environment of 100-300° C. to form a composite film layer of polyimide and silicon dioxide;

[0107] Step S605 , attaching release films to the upper and lower surfaces of the composite film layer.

[0108] Specifically, the two release films are used to prevent contamination during transportation and other processes. When the composite film layer needs to be used as an electro-enhanced layer in a display module, the release film needs to be peeled off first, and then the electro-enhanced layer 10 is laminated with the first transparent electrode layer 11 and the second transparent electrode layer 12. The composite film layers produced in this process have strong bonding force.

[0109] It should be noted that the above-mentioned methods for preparing the electro-enhanced layer are only examples, and the embodiments of the present application do not limit the methods for preparing the electro-enhanced layer.

[0110] In the embodiments of the present application, "at least one" refers to one or more, and "plurality" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can be represented by: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0111] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An impact protection layer for a display module, the display module comprising a stacked display panel, the impact protection layer and a cover plate, the impact protection layer being located between the display panel and the cover plate, characterized in that: The impact protection layer comprises: A first transparent electrode layer, an electroenhanced layer, and a second transparent electrode layer are stacked, wherein the electroenhanced layer is located between the first transparent electrode layer and the second transparent electrode layer, the electroenhanced layer is a transparent film layer, and the Young's modulus of the electroenhanced layer is positively correlated with the electric field intensity passing through the electroenhanced layer; If the terminal is in a falling state, different voltages are applied to the first transparent electrode layer and the second transparent electrode layer in the impact protection layer, respectively, and an electric field is generated between the first transparent electrode layer and the second transparent electrode layer in the impact protection layer due to the voltage difference; If the terminal is not in a falling state, different voltages are not applied to the first transparent electrode layer and the second transparent electrode layer in the impact protection layer, and no electric field is generated between the first transparent electrode layer and the second transparent electrode layer in the impact protection layer due to the voltage difference.

2. The impact protection layer according to claim 1, characterized in that: The electroenhancement layer is a silicon dioxide material layer.

3. The impact protection layer according to claim 1, characterized in that: The electro-enhancement layer comprises a transparent substrate and electro-enhancement particles attached to the surface of the transparent substrate. The electro-enhancement particles are nano-spheres, nano-tubes or graphene aerogels. The nano-spheres or nano-tubes are silicon dioxide or graphene materials.

4. The impact protection layer according to claim 1, characterized in that: The electro-enhancement layer is made of a mixed material of a transparent substrate and electro-enhancement fibers, and the electro-enhancement fibers are made of silicon dioxide or graphene.

5. The impact protection layer according to claim 1, characterized in that: Any one of the first transparent electrode layer and the second transparent electrode layer comprises a transparent substrate and a conductive grid attached to a surface of the transparent substrate; The conductive grid is any one of metal, graphene, carbon nanotube, carbon fiber and conductive polymer.

6. The impact protection layer according to any one of claims 3 to 5, characterized in that: The transparent substrate is a cycloolefin polymer material, a polyimide material, a polyethylene terephthalate material or a triacetate cellulose film.

7. A method for controlling an impact protection layer, characterized in that: Used for a terminal, the terminal comprising the impact protection layer according to any one of claims 1 to 6, the impact protection layer control method: Periodically determine whether the terminal is in a falling state. If so, apply different voltages to the first transparent electrode layer and the second transparent electrode layer in the impact protection layer, respectively, so that an electric field is generated between the first transparent electrode layer and the second transparent electrode layer in the impact protection layer due to the voltage difference. If not, stop applying different voltages to the first transparent electrode layer and the second transparent electrode layer in the impact protection layer, respectively, so that an electric field is not generated between the first transparent electrode layer and the second transparent electrode layer in the impact protection layer due to the voltage difference.

8. The method for controlling the impact protection layer according to claim 7, characterized in that: Also includes: Periodically determine whether the terminal is in a flattened state. If so, apply different voltages to the first transparent electrode layer and the second transparent electrode layer in the impact protection layer, respectively, so that an electric field is generated between the first transparent electrode layer and the second transparent electrode layer in the impact protection layer due to the voltage difference. If not, stop applying different voltages to the first transparent electrode layer and the second transparent electrode layer in the impact protection layer, respectively, so that an electric field is not generated between the first transparent electrode layer and the second transparent electrode layer in the impact protection layer due to the voltage difference.

9. An impact protection layer control device, characterized in that: include: A processor and a memory, wherein the memory is used to store at least one instruction, and when the instruction is loaded and executed by the processor, the impact protection layer control method as described in claim 7 or 8 is implemented.

10. A display module, characterized in that: include: A display panel, an impact protection layer and a cover plate are stacked, wherein the impact protection layer is located between the display panel and the cover plate, and the impact protection layer is the impact protection layer as described in any one of claims 1 to 6.

11. The display module according to claim 10, characterized in that: Also includes: A circular polarizer, wherein the circular polarizer is located between the cover plate and the display panel, and the impact protection layer is located between the circular polarizer and the display panel; The cover plate includes a protective layer and a hard coating layer, and the protective layer is located between the hard coating layer and the circular polarizer.

12. The display module according to claim 10, characterized in that: Also includes: A circular polarizer and a hard coating layer, wherein the circular polarizer is located between the hard coating layer and the display panel, and the impact protection layer is located between the circular polarizer and the hard coating layer.

13. The display module according to claim 12, characterized in that: The impact protection layer includes a first impact protection layer and a second impact protection layer, the first impact protection layer is located between the circular polarizer and the hard coating layer, and the second impact protection layer is located on a side of the display panel away from the hard coating layer.

14. A terminal, characterized in that: include: The display module according to any one of claims 10 to 13; The impact protection layer control device as claimed in claim 9.

15. A method for preparing an electroenhancement layer, characterized in that: The electroenhanced layer is used for the impact protection layer according to any one of claims 1 to 6, and the method comprises: Dissolving 1,1-bis(p-chlorophenyl)-2,2-dichloroethylene in N,N-dimethylacetamide to form a solution; adding pyromellitic anhydride to the solution and stirring to form a polyacrylic acid solution; adding tetraethoxysilane to the polyacrylic acid solution and stirring to form a polyimide precursor; The polyimide precursor is coated on the surface of the silicon dioxide layer, and the polyimide precursor coated on the surface of the silicon dioxide is imidized to form a composite film layer of polyimide and silicon dioxide.

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