Display modules, electronic devices, and touch control systems

Abstract

The present application provides a display module, comprising a device layer and a base layer arranged in a stacked manner, wherein the base layer is arranged away from the light-emitting surface of the device layer; wherein the base layer comprises a first base film, an electromagnetic induction layer and a second base film arranged in a stacked manner, wherein the first base film is away from the device layer, and the second base film is close to the device layer; the projection area of ​​the electromagnetic induction layer projected on the device layer does not exceed the projection area of ​​the first base film or the second base film projected on the device layer. The display module, electronic device and touch control system provided by the embodiments of the present application realize the electromagnetic pen function by setting an electromagnetic induction layer; and the electromagnetic induction layer is set between the first base film and the second base film, without the need for an external electromagnetic induction layer, and the overall thickness of the display module and the electronic device is hardly increased, which greatly facilitates the solution of making the electronic device thin and light.

Description

Technical Field

[0001] The present application relates to the technical field of electronic device structures, and specifically to a display module, electronic device, and a touch control system. Background Art

[0002] The application of stylus pens on electronic devices (such as mobile phones, etc.) mainly includes business, painting, games, office learning, note-taking, etc., and a relatively mature system solution has been formed. Stylus pens mainly include: capacitive passive pens, capacitive active pens, and electromagnetic EMR (electromagnetic induction input technology, Electro-Magnetic Resonance) active pens. From the perspective of performance and user experience, capacitive active pens and electromagnetic EMR active pens are better.

[0003] With the development of OLED (Organic Light-Emitting Diode) technology, new display panels such as foldable screens and curved screens have gradually become a development trend. Based on this, the market has gradually introduced foldable screens and / or curved screens with stylus solutions to enhance user experience.

[0004] Based on the high touch accuracy and strong anti-interference ability of electromagnetic EMR active pens, electromagnetic EMR active pens have become the first choice in the market. However, in actual applications, folding screens and / or curved screens with electromagnetic EMR active pens have exposed many defects. Summary of the invention

[0005] On the one hand, an embodiment of the present application provides a display module, including a stacked device layer and a base layer, wherein the base layer is arranged away from a light-emitting surface of the device layer; wherein the base layer includes a stacked first base film, an electromagnetic induction layer and a second base film, wherein the first base film is away from the device layer and the second base film is close to the device layer; and a projection area of ​​the electromagnetic induction layer projected on the device layer does not exceed a projection area of ​​the first base film or the second base film projected on the device layer.

[0006] On the other hand, an embodiment of the present application further provides an electronic device, including a shell, a display screen cover plate and the display module described in the aforementioned embodiment, the display screen cover plate is attached to the display surface of the display module, the shell is connected to the display screen cover plate, and together they are arranged to form a accommodating space, and the display module is arranged in the accommodating space.

[0007] Furthermore, an embodiment of the present application also provides a touch control system, including a stylus and the electronic device described in the aforementioned embodiment, wherein the stylus is used to touch the display area of ​​the electronic device to realize command input; wherein the stylus is an electromagnetic pen, and the induction coil in the electromagnetic pen cooperates with the electromagnetic induction layer of the electronic device to realize signal reception and transmission.

[0008] The display module, electronic device and touch control system provided by the embodiment of the present application realize the electromagnetic pen function by setting an electromagnetic induction layer; and the electromagnetic induction layer is set between the first base film and the second base film, and there is no need to hang an external electromagnetic induction layer, which will hardly increase the overall thickness of the display module and the electronic device, greatly facilitating the thinning and lightening solution of the electronic device. In addition, by integrating the electromagnetic induction layer into the base layer, a thin, rollable or foldable flexible rollable or foldable display screen can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0010] Figure 1 is a schematic diagram of the stacked structure of the display module in some embodiments of the present application;

[0011] Figure 2 is a schematic diagram of the structure of an electronic device in some embodiments of the present application;

[0012] Figure 3 yes Figure 2 A schematic diagram of a partial structural disassembly of an electronic device in an embodiment;

[0013] Figure 4 is a schematic diagram of a stacked structure of a display module in some embodiments of the present application;

[0014] Figure 5 is a schematic diagram of the coil layout of the electromagnetic induction layer in some embodiments of the present application;

[0015] Figure 6 is a schematic diagram of a stacked structure of a display module in some embodiments of the present application;

[0016] Figure 7 is a schematic diagram of forming a first induction coil in some embodiments of the present application;

[0017] Figure 8 is a schematic diagram of forming a second induction coil in some embodiments of the present application;

[0018] Fig. 9 is a schematic diagram of the structure of the electromagnetic induction layer in some embodiments of the present application;

[0019] Fig.10 is a schematic diagram of a stacked structure of a display module in some other embodiments of the present application;

[0020] Fig.11 is a schematic diagram of the stacked structure of the polarizing layer in other embodiments of the present application;

[0021] Fig.12 is a schematic diagram of a partial stacked structure of a device layer in some other embodiments of the present application;

[0022] Fig.13 is a schematic structural block diagram of a touch control system in some other embodiments of the present application;

[0023] Fig.14 It is a schematic diagram of the structural composition of mobile terminal devices in other embodiments of the present application. DETAILED DESCRIPTION

[0024] The present application is further described in detail below in conjunction with the accompanying drawings and examples. It is particularly noted that the following examples are only used to illustrate the present application, but are not intended to limit the scope of the present application. Similarly, the following examples are only some embodiments of the present application rather than all embodiments, and all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0025] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0026] As used herein, "electronic devices" (or simply "terminals") include, but are not limited to, devices configured to receive / send communication signals via a wireline connection (e.g., via a public switched telephone network (PSTN), a digital subscriber line (DSL), a digital cable, a direct cable connection, and / or another data connection / network) and / or via a wireless interface (e.g., for a cellular network, a wireless local area network (WLAN), a digital television network such as a DVB-H network, a satellite network, an AM-FM broadcast transmitter, and / or another communication terminal). Communication terminals configured to communicate via a wireless interface may be referred to as "wireless communication terminals", "wireless terminals" or "mobile terminals". Examples of mobile terminals include, but are not limited to, satellite or cellular phones; personal communication system (PCS) terminals that may combine cellular radiotelephones with data processing, fax, and data communication capabilities; PDAs that may include radiotelephones, pagers, Internet / intranet access, web browsers, organizers, calendars, and / or global positioning system (GPS) receivers; and conventional laptop and / or palmtop receivers or other electronic devices that include radiotelephone transceivers. A mobile phone is an electronic device equipped with a cellular communication module.

[0027] OLED flexible display screens have the advantages of self-luminescence, high contrast, thin thickness, wide viewing angle and fast response speed. They are increasingly respected by the industry and have been widely used in various electronic devices, such as mobile phones, tablets, wearable devices, etc. In addition, OLED flexible display screens have the characteristics of light weight, low temperature resistance and high luminous efficiency, so they have become the mainstream display screen in the display industry. OLED flexible display screens generally use high-temperature resistant flexible polyimide (PI) film as the substrate, so they can be made into 3D laminated display screens like flexible plastic films, such as folding screens, curved screens and other new forms of display screens.

[0028] The applicant found in the research that compared with the traditional capacitive stylus, the electromagnetic EMR active pen has higher touch accuracy and SNR (Signal Noise Ratio), especially when it is decoupled from the OLED flexible display screen touch, it is less interfered by the display, and the technical advantages are obvious. However, the use of the electromagnetic EMR active pen requires an additional electromagnetic induction layer to interact with the electromagnetic EMR active pen for signal, thereby realizing the stylus function.

[0029] Based on this, the present application adds an additional electromagnetic induction layer under the screen, and the electromagnetic EMR active pen emits electromagnetic signals and interacts with the electromagnetic induction layer under the screen to obtain the position of the pen tip through the change of magnetic flux. Figure 1 , Figure 11 is a schematic diagram of the stacked structure of the display module 100 in some embodiments of the present application. The display module 100 can generally include an electromagnetic induction layer 110, a base layer 120, and a device layer 130 stacked from bottom to top. The base layer 120 is disposed between the electromagnetic induction layer 110 and the device layer 130. The device layer 130 is used to emit light for display. The base layer 120 is disposed on the non-luminous surface of the device layer 130 to prevent water vapor from entering the device layer 130. The electromagnetic induction layer 110 is disposed on the side of the base layer 120 away from the device layer 130, that is, the electromagnetic induction layer 110 is attached to the non-display side of the display module 100 to interact with the electromagnetic signal emitted by the electromagnetic EMR active pen.

[0030] However, the applicant further discovered that by attaching the electromagnetic induction layer 110 to the non-display surface of the display module 100 in the above-mentioned external hanging manner, the electromagnetic induction layer 110 itself has a thickness of about 0.15 mm, which increases the overall thickness of the display module 100 by about 0.15 mm. In addition, the electromagnetic induction layer 110 in the external hanging manner is prone to induction coil breakage after multiple foldings. For example, the applicant has found through experiments that the electromagnetic induction layer 110 in the external hanging manner is prone to induction coil breakage after being bent within 180° for about 20,000 times, which is not suitable for use with new forms of display screens such as folding screens and curved screens, and the user experience is poor.

[0031] To solve the above problems, the applicant continued to study and found that if the electromagnetic induction layer is integrated into the display module through an integrated method, compared with the external plug-in method, it can not only reduce the overall thickness of the display module, but also can interact with the electromagnetic EMR active pen for signal interaction. At the same time, it can also be suitable for rollable curved screens or foldable folding screens.

[0032] Based on this, please refer to Figures 2 to 3 , Figure 2 is a schematic diagram of the structure of an electronic device in some embodiments of the present application, Figure 3 yes Figure 2 Schematic diagram of partial structural disassembly of an electronic device in an embodiment. It should be noted that the electronic device 1000 in the embodiment of the present application may include a mobile phone, a tablet computer, a laptop computer, a wearable device, etc. The electronic device 1000 may generally include the following structures: a display screen assembly 10 and a housing 20; the display screen assembly 10 includes a display module 200 and a display screen cover 300.

[0033] Specifically, the display screen cover 300 is attached to the display surface of the display module 200 to protect the display module 200. The housing 20 is connected to the display screen cover 300 of the display screen assembly 10, and together they enclose a receiving space 101, in which the display module 200 of the display screen assembly 10 is disposed. The display module 200 may be an OLED flexible display screen, and the display screen cover 300 may be made of glass.

[0034] For further information, please refer to Figure 4 , Figure 4 2 is a schematic diagram of a stacked structure of a display module 200 in some embodiments of the present application. The display module 200 may generally include a stacked device layer 210 and a base layer 220. The base layer 220 is arranged away from the light emitting surface of the device layer 210, that is, the base layer 220 is arranged on the non-display surface of the display module 200 to prevent water vapor from entering the device layer 210. The device layer 210 is used to emit light and emit light in a direction away from the base layer 220 for display.

[0035] Specifically, the base layer 220 includes a first base film 221, a second base film 222, and an electromagnetic induction layer 223, wherein the electromagnetic induction layer 223 is disposed between the first base film 221 and the second base film 222. In other words, the base layer 220 includes a first base film 221, an electromagnetic induction layer 223, and a second base film 222 that are stacked, wherein the first base film 221 is far from the device layer 210, and the second base film 222 is disposed close to the device layer 210.

[0036] It can be understood that the first base film 221 and the second base film 222 can both be made of polyimide film (PI film), and the thickness of the first base film 221 and the second base film 222 is roughly between 8 and 10 μm. An inorganic film can be arranged between the first base film 221 and the second base film 222 to prevent water vapor and the like from entering.

[0037] Furthermore, the projection area of ​​the electromagnetic induction layer 223 projected on the device layer 210 does not exceed the projection area of ​​the first base film 221 or the second base film 222 projected on the device layer 210. In other words, the electromagnetic induction layer 223 is sandwiched between the first base film 221 and the second base film 222, and is not exposed to avoid occupying the external space of the display module 200. It can be understood that the electromagnetic induction layer is used to interact with the external electromagnetic pen and obtain the position of the pen tip through the change of magnetic flux. The external electromagnetic pen can be an electromagnetic EMR active pen, and emits electromagnetic signals to interact with the electromagnetic induction layer 223, and then obtain the position of the pen tip through the change of magnetic flux.

[0038] It should be noted that the terms "first", "second", and "third" in this application are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first", "second", and "third" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0039] The working principle of the electromagnetic induction layer and the electromagnetic pen is explained by using a folding screen with an electromagnetic pen. Specifically, an induction coil is provided in the electromagnetic pen, which forms an electromagnetic pen resonant circuit, and the electromagnetic induction layer is generally composed of a receiving coil and a transmitting coil. The transmitting coil is used to send electromagnetic waves to the electromagnetic pen, and the receiving coil is used to receive the resonant signal generated by the resonance between the electromagnetic pen and the electromagnetic waves sent by the transmitting coil. When the electromagnetic pen with a resonant circuit moves on the screen with an electromagnetic induction layer, the resonant circuit is excited by the electromagnetic waves emitted by the transmitting coil and emits a resonant signal, and the resonant signal is received by the receiving coil, thereby determining the position of the electromagnetic pen on the screen.

[0040] In the embodiment of the present application, the receiving coil and the transmitting coil of the electromagnetic induction layer 223 are respectively formed by etching two layers of metal, such as Figure 5 As shown, Figure 5 Schematic diagram of the coil layout of the electromagnetic induction layer in some embodiments of the present application. The transmitting coil C and the receiving coil R are spaced apart in a direction parallel to the XY plane. When the electromagnetic pen approaches or moves away in the Z direction, the magnetic flux of the electromagnetic induction layer 223 changes, and signals are exchanged with the electromagnetic pen to determine the position of the electromagnetic pen.

[0041] The display module provided in the embodiment of the present application integrates the electromagnetic induction layer inside the base layer, that is, the electromagnetic induction layer is arranged between the first base film and the second base film, so that the folding screen or the curved screen can realize the electromagnetic pen function.

[0042] In some embodiments of this application, please refer to Figure 6 , Figure 6 2 is a schematic diagram of a stacked structure of a display module 200 in some embodiments of the present application, wherein the electromagnetic induction coil 223 includes a first induction coil 2231 and a second induction coil 2232 which are stacked. The first induction coil 2231 may be a transmitting coil, and the second induction coil 2232 may be a receiving coil; or the first induction coil 2231 is a receiving coil, and the second induction coil 2232 is a transmitting coil.

[0043] Specifically, the first induction coil 2231 is disposed on the first base film 221 , and the second induction coil 2232 is disposed on a side of the second base film 222 close to the first base film 221 , thereby forming a structure in which the first base film 221 and the second base film 222 sandwich the first induction coil 2231 and the second induction coil 2232 .

[0044] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0045] Furthermore, the first induction coil 2231 and the second induction coil 2232 are insulated to avoid short circuit or other defects. In some embodiments of the present application, an insulating layer 2233 is provided between the first induction coil 2231 and the second induction coil 2232 to achieve an insulating setting. It should be understood that the insulating layer 2233 is generally made of an insulating material. In the embodiment of the present application, the insulating layer 2233 is preferably made of an inorganic material. For example, the insulating layer 2233 can be made of one or a combination of two or more of Al2O3, TiO2, SiNx, SiCNx, SiOx, etc., which can not only play an insulating role, but also increase the water-blocking function of the insulating layer 2233.

[0046] As mentioned above, the transmitter coil and the receiver coil can be formed by metal etching. Figure 7 , Figure 7 2 is a schematic diagram of forming the first induction coil 2231 in some embodiments of the present application, that is, the first induction coil 2231 is formed by: forming a first metal layer 2211 on a side of the first base film 221 close to the second base film 222, and patterning the first metal layer 2211 to form the first induction coil 2231. In the embodiment of the present application, the thickness of the first metal layer 2211 is about 240nm to 400nm, for example, the thickness of the first metal layer 2211 can be 240nm, 300nm, 340nm, 400nm, etc.

[0047] It is understandable that the first metal layer 2211 can be deposited on the surface of the first base film 221 by physical vapor deposition (PVD) so that the first metal layer 2211 has strong adhesion. Of course, the first metal layer 2211 can also be formed by methods such as chemical vapor deposition (CVD) and coating. In addition, the first metal layer 2211 can be patterned by etching, photolithography, etc.

[0048] For further information, see Figure 8 , Figure 8 2 is a schematic diagram of forming the second induction coil 2232 in some embodiments of the present application, that is, the second induction coil 2232 is formed by: forming a second metal layer 2222 on a side of the second base film 222 close to the first base film 221, and patterning the second metal layer 2222 to form the second induction coil 2232. In the embodiment of the present application, the thickness of the second metal layer 2222 is about 240nm to 400nm, for example, the thickness of the second metal layer 2222 can be 240nm, 300nm, 340nm, 400nm, etc.

[0049] It is understandable that the second metal layer 2222 can be deposited on the surface of the second base film 222 by physical vapor deposition (PVD) so that the second metal layer 2222 has strong adhesion. Of course, the second metal layer 2222 can also be formed by methods such as chemical vapor deposition (CVD) and coating. In addition, the second metal layer 2222 can be patterned by etching, photolithography, etc.

[0050] based on Figure 7 as well as Figure 8 The formation method of the first induction coil 2231 and the second induction coil 2232 shown in the figure is to further coat an inorganic insulating material on the side of the first base film 221 close to the second base film 22 to wrap the first induction coil 2231, and to coat an inorganic insulating material on the side of the second base film 222 close to the first base film 221 to wrap the second induction coil 2232. Then the first base film 221 and the second base film 222 are brought close to each other and attached together to form a stable base layer 220. Based on the thickness ranges of the first induction coil 2231, the second induction coil 2232 and the insulating layer 2233, in order to minimize the overall thickness of the display module 200, the thickness of the electromagnetic induction layer 223 is generally not more than 1 μm, which hardly affects the overall thickness of the display module 200.

[0051] In this embodiment, the thickness of the electromagnetic induction layer 223 is generally 0.5-0.9 μm. For example, the thickness of the electromagnetic induction layer 223 may be 0.5 μm, 0.65 μm, 0.8 μm, 0.9 μm, etc.

[0052] Of course, in other embodiments, an inorganic insulating material may be coated on the first base film to wrap the first induction coil, or an inorganic insulating material may be coated on the second base film to wrap the second induction coil, and then the base layer may be formed.

[0053] For further information, see Fig. 9 , Fig. 9 2 is a schematic diagram of the structure of the electromagnetic induction layer 223 in some embodiments of the present application, wherein the first induction coil 2231 is convexly disposed on the surface of the first base film 221 close to the second base film 222, and the second induction coil 2232 is convexly disposed on the surface of the second base film 222 close to the first base film 221. Specifically, in a direction perpendicular to the first base film 221 or the second base film 222, the first induction coil 2231 and the second induction coil 2232 are spaced apart to avoid poor signals caused by contact. At the same time, the insulating layer 2233 is filled between the first induction coil 2231 and the second induction coil 2232, and covers the first induction coil 2231 and the second induction coil 2232, so as to avoid contact interference between the coils.

[0054] It can be understood that in the direction parallel to the first base film or the second base film, the first induction coil and the second induction coil are staggered to avoid overlapping to the greatest extent, so as to enhance the heat dissipation efficiency between the coils and maintain the stability of the coil signal transmission.

[0055] Based on this, in order to ensure the stability of signal transmission of the first induction coil and the second induction coil, the first induction coil and the second induction coil are made of metal materials with high conductivity. In the embodiment of the present application, the first induction coil and the second induction coil can adopt a titanium-aluminum composite layer structure or a molybdenum-aluminum composite layer structure, wherein the aluminum layer in the titanium-aluminum composite layer structure is arranged between the titanium layers, and the aluminum layer in the molybdenum-aluminum composite layer structure is arranged between the molybdenum layers.

[0056] For example, the first induction coil and the second induction coil can be made of Ti / Al / Ti (titanium / aluminum / titanium) or Mo / Al / Mo (molybdenum / aluminum / molybdenum) structure. It can be understood that the first induction coil and the second induction coil can be made of a three-layer structure of Ti / Al / Ti or Mo / Al / Mo. Taking the aluminum layer arranged between the titanium layers or the aluminum layer arranged between the molybdenum layers as an example, the Ti or Mo in the three-layer structure can protect the Al. In other words, the middle Al layer plays a conductive role, the surface Ti or Mo layer can protect the middle Al layer, and the bottom Ti or Mo layer can increase the adhesion. In addition, the provision of a Ti or Mo layer can improve the impact resistance and energy absorption properties of the induction coil. The strength and toughness of the induction coil can be improved through the structural design of the Ti / Al / Ti or Mo / Al / Mo composite layer.

[0057] Specifically, in the manufacturing process, a bottom Ti or Mo layer, an intermediate Al layer and a surface Ti or Mo layer are usually sputtered on the surface of the substrate in sequence, and then the sputtered Ti / Al / Ti or Mo / Al / Mo layer is etched to obtain the corresponding Ti / Al / Ti or Mo / Al / Mo induction coil. Practice has proved that if the cross section of the etched Ti / Al / Ti or Mo / Al / Mo is sloped, that is, the bottom Ti or Mo layer extends out of the middle Al layer and the Al layer extends out of the surface Ti or Mo layer at the etched cross section of the Ti / Al / Ti or Mo Al Mo layer on the surface of the substrate, the reliability of the induction coil finally obtained is relatively high. Among them, the thickness of the bottom Ti or Mo layer is generally 30nm to 60nm, the thickness of the middle Al layer is generally 180nm to 280nm, and the thickness of the surface Ti or Mo layer is generally 30nm to 60nm.

[0058] The display module provided in the embodiment of the present application integrates the electromagnetic induction layer inside the base layer, that is, the electromagnetic induction layer is arranged between the first base film and the second base film, and no external electromagnetic induction layer is required, so that the folding screen or the curved screen can realize the electromagnetic pen function. At the same time, the electromagnetic induction layer formed by the first base film and the second base film is almost not increased. The overall thickness of the display module is greatly facilitated compared with the solution of external electromagnetic induction layer.

[0059] In other embodiments of the present application, please refer to Fig.10 , Fig.10 2 is a schematic diagram of the stacked structure of the display module 200 in other embodiments of the present application. The display module 200 may also include a polarizing layer 230, an encapsulation layer 240, an inorganic layer 250 and a buffer layer 260 arranged from top to bottom. Specifically, the buffer layer 260 is arranged on the side of the base layer 220 away from the device layer 210 to provide a buffering protection when the display module 200 cooperates with external devices of the electronic device. In the embodiment of the present application, the buffer layer 260 can be made of foam. Of course, in other embodiments, the buffer layer 260 can also be made of one or both of SiNx and SiOx.

[0060] Furthermore, the inorganic layer 250 is disposed between the base layer 220 and the device layer 210 to isolate water vapor and flatten the display module 200. The inorganic layer 250 can be made of one or a combination of two or more of Al2O3, TiO2, SiNx, SiCNx, SiOx, etc., to increase the water barrier function. The encapsulation layer 240 is disposed on the side of the device layer 210 away from the base layer 220. The encapsulation layer 240 is generally made of thin film encapsulation (Thin-Film Encapsulation, TFE), which can prevent water and oxygen from having an adverse effect on the device layer 210. The polarizing layer 230 is disposed on the side of the encapsulation layer 240 away from the device layer 210, and the polarizing layer 230 and the encapsulation layer 240 can generally be connected by colloid bonding. For example, the polarizing layer 230 and the encapsulation layer 240 may be bonded and connected by transparent adhesives such as pressure sensitive adhesive (PSA) and optical clear adhesive (OCA).

[0061] For further information, please refer to Fig.11 , Fig.11 Schematic diagram of the laminated structure of the polarizing layer 230 in other embodiments of the present application. The polarizing layer 230 may generally include a laminated wave plate 231, a PSA layer 232, a PVA (PolyvinylAlcohol) film 233, and a TAC (Triacetyl Cellulose) film 234. The wave plate 231 is disposed close to the encapsulation layer 240 and is bonded to the encapsulation layer 240 through a colloid. The TAC film 234 is provided with two layers, and a PVA film 234 is provided between the two layers of TAC film 234. One layer of TAC film 234 is disposed close to the wave plate 231 and is connected to the PSA layer 232, and the other layer of TAC film 234 is disposed away from the wave plate 231 and is bonded to an external device of the electronic device (e.g., a display cover).

[0062] Specifically, the wave plate 231 is used to shield the reflection of ambient light, so that the ambient light cannot be emitted after being reflected in the screen, thereby improving the picture display effect. The wave plate 231 generally includes a λ / 4 wave plate and a λ / 2 wave plate. The λ / 4 wave plate can play a basic role in shielding reflected light, and the λ / 2 wave plate has a better shielding effect on the short-wave portion.

[0063] Furthermore, the polarizing layer 230 has a PVA layer 233, but PVA is very easy to hydrolyze. In order to protect the physical properties of the polarizing film, a TAC film 234 with high light transmittance, good water resistance and certain mechanical strength is laminated on both sides of the PVA layer 233 for protection. Generally speaking, according to different use requirements, the PSA layer, PVA film or TAC film used is colored to form a color polarizer.

[0064] In other embodiments of this application, please refer to Fig.12 , Fig.12 It is a schematic diagram of a partial stacked structure of the device layer 210 in some other embodiments of the present application. The device layer 210 can generally include a stacked driving circuit 211 and a light-emitting element 212. The driving circuit 211 is arranged close to the base layer 220, and the light-emitting element 212 is arranged away from the base layer 220. The side of the light-emitting element 212 away from the driving circuit 211 is the light-emitting surface of the display module 200, i.e., the device layer 210.

[0065] Specifically, the driving circuit 211 generally includes a multi-layer TFT (Thin Film Transistor) circuit layer arranged at intervals. The TFT circuit layer is connected to the light-emitting element 212 and is used to drive the light-emitting element 212 to emit light, so that the display module 300 can realize the display function. It can be understood that the TFT circuit layer is generally provided with a source and drain electrode, a gate electrode, and an insulating material between the source and drain electrode and the gate electrode of the thin film transistor. Among them, the source and drain electrode are used to connect the light-emitting element 212 and the external data line, and the gate electrode is used to connect the external scanning line, so that when a sufficient voltage is applied to the scanning line, the thin film transistor on the scanning line can be turned on. At this time, the display signal voltage on the data line is written into the light-emitting element 212, thereby achieving the effect of controlling the luminous color.

[0066] Furthermore, the light-emitting element 212 may be an organic light-emitting diode (OLED). OLED devices have the advantages of simple structure, self-luminescence, high contrast, fast response speed, low power consumption, etc., and have been widely used in display fields such as mobile phones, tablets, and televisions. The light-emitting element 212 is used to realize the normal display of the display module 200, and the direction of the light-emitting element 212 away from the driving circuit 211 is the light emitting direction of the display module 200. It can be understood that the light emitting surface of the display module 200 is the display surface.

[0067] The light emitting element 212 may generally include a stacked anode layer 2121, a cathode layer 2122, and a light emitting layer 2123 disposed between the anode layer 2121 and the cathode layer 2122. The anode layer 2121 is close to the substrate layer 220, and the light emitting layer 2123 forms a pixel region of the device layer 210. The direction from the anode layer 2121 to the cathode layer 2122 is substantially parallel to the light emitting direction of the display module 200. It should be understood that the pixel region of the device layer 210 is the display region of the display module 200.

[0068] The material of the anode layer 2121 is a conductive metal oxide, and the thickness is generally 20-200nm. The material of the anode layer 2121 can be ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide). The cathode layer 2122 is formed on the light-emitting layer 2123 and is made of a conductive material, and the thickness is generally 20nm-200nm. The material of the cathode layer 2122 includes but is not limited to one of the alloys of Mg / Ag, Ca / Al, Mg / MgAg, Gd / Al, Al / Li, Sn / Al and Ag / Al, which can prevent water and oxygen from having an adverse effect on the cathode layer.

[0069] Please continue reading Figure 2 and Figure 3 The embodiment of the present application further provides an electronic device 1000, which may generally include a housing 20, a display module 200, and a display screen cover 300, wherein the display screen cover 300 is attached to the display surface of the display module 200. The display module 200 may be the display module 200 in the aforementioned embodiment.

[0070] Specifically, the housing 20 is connected to the display screen cover 300 and together encloses a receiving space 101, and the display module 200 is disposed in the receiving space 101. It should be noted that the detailed structure of the display module can be found in the related description of the above embodiment, which will not be repeated here.

[0071] Of course, in other embodiments, the electronic device 1000 may further include a touch panel (not shown in the figure), which is attached between the display module 200 and the display screen cover 300 .

[0072] Specifically, the touch panel can be attached between the display module 200 and the display screen cover 300 by optical clear adhesive (OCA). The types of optical adhesive are within the scope of understanding of those skilled in the art and will not be listed here. The display module 200 can be the display module 200 in the above embodiment and will not be described in detail here.

[0073] Of course, in other embodiments, the touch panel sticker is not limited to being disposed between the display module and the display screen cover. It is understandable that in order to improve the assembly efficiency of the display screen assembly, the touch panel and the display module can be designed as an integrated structure or the touch panel and the display screen cover can be designed as an integrated structure. For example, the touch panel can be embedded in the display module in an IN-CELL or ON-CELL manner to realize the integrated structural design of the touch panel and the display module. For another example, the OGS (One Glass Solution) method or the TOL (Touch on Lens, integrated capacitive touch screen) method can be used to realize the integrated structural design of the touch panel and the display screen cover.

[0074] The electronic device and display module provided by the embodiment of the present application realize the electromagnetic pen function by setting an electromagnetic induction layer; and the electromagnetic induction layer is set between the first base film and the second base film, and there is no need to hang an external electromagnetic induction layer, which will hardly increase the overall thickness of the display module and the electronic device, greatly facilitating the thinning and lightening solution of the electronic device. In addition, by integrating the electromagnetic induction coil into the base layer, a thin, rollable or foldable flexible rollable or foldable display screen can be realized.

[0075] The present application also provides a touch control system. Fig.13 , Fig.13 5 is a schematic block diagram of a touch control system 500 in some other embodiments of the present application. The touch control system 500 may generally include a stylus 510 and an electronic device 520. The stylus 510 is used to touch the display area of ​​the electronic device 520 to implement command input.

[0076] Specifically, the stylus pen 520 is an electromagnetic pen, which is provided with an induction coil 511. The induction coil 511 in the electromagnetic pen 520 cooperates with the electromagnetic induction layer of the electronic device 520 to realize signal reception and transmission. It can be understood that the electronic device 520 in the embodiment of the present application can be the electronic device 1000 in the aforementioned embodiment, and the embodiment of the present application will not be repeated.

[0077] Furthermore, the electromagnetic induction layer of the electronic device 520 may generally include a receiving coil 521 and a transmitting coil 522. The transmitting coil 522 is used to send electromagnetic waves to the electromagnetic pen, and the receiving coil 521 is used to receive a resonance signal generated by the electromagnetic pen 520 resonating with the electromagnetic waves sent by the transmitting coil 522. The induction coil 511 in the electromagnetic pen 520 forms a resonance circuit of the electromagnetic pen 520. When the electromagnetic pen 510 moves in the display area of ​​the electronic device 520, the resonance circuit of the electromagnetic pen 520 is excited by the electromagnetic waves emitted by the transmitting coil 522 to emit a resonance signal, and the resonance signal is received by the receiving coil 521, thereby determining the position of the electromagnetic pen 510 in the display area of ​​the electronic device 520.

[0078] It can be understood that in the embodiment of the present application, the formation method and position relationship of the receiving coil 521 and the transmitting coil 522 can refer to the induction coil in the aforementioned embodiment, so it is not repeated here.

[0079] The touch control system provided in the embodiment of the present application integrates an electromagnetic induction layer in the display module of the electronic device to cooperate with the electromagnetic pen to form signal interaction, thereby determining the position of the electromagnetic pen in the display area of ​​the electronic device, thereby realizing the function of a folding screen or a curved screen with an electromagnetic pen, and has extremely high market application value.

[0080] Furthermore, in some other embodiments of the present application, a mobile terminal device is provided. Fig.14 , Fig.14 It is a schematic diagram of the structure of a mobile terminal device in other embodiments of the present application. The mobile terminal device can be a mobile phone, a tablet computer, a laptop computer, a wearable device, etc. The mobile phone is used as an example in the diagram of this embodiment. The structure of the terminal device 900 may include an RF circuit 910, a memory 920, an input unit 930, a display unit 940 (i.e., the display screen assembly 10 in the above embodiment), a sensor 950, an audio circuit 960, a wifi module 970, a processor 980, and a power supply 990. Among them, the RF circuit 910, the memory 920, the input unit 930, the display unit 940, the sensor 950, the audio circuit 960, and the wifi module 970 are respectively connected to the processor 980; the power supply 990 is used to provide power to the entire terminal device 900.

[0081] Specifically, the RF circuit 910 is used to receive and send signals; the memory 920 is used to store data instruction information; the input unit 930 is used to input information, which may specifically include a touch panel 931 and other input devices 932 such as operation buttons; the display unit 940 may include a display panel 941 (i.e., the display module 200 in the above embodiment); the sensor 950 includes an infrared sensor, a laser sensor, etc., for detecting user approach signals, distance signals, etc.; the speaker 961 and the microphone (or microphone) 962 are connected to the processor 980 through the audio circuit 960 for receiving and sending sound signals; the wifi module 970 is used to receive and transmit wifi signals, and the processor 980 is used to process data information of the mobile terminal device. For the relevant technical features of the display module, please refer to the relevant description of the above display module embodiment, which will not be described in detail here.

[0082] The mobile terminal device provided in this embodiment realizes the electromagnetic pen function by providing an electromagnetic induction layer; and the electromagnetic induction layer is provided between the first base film and the second base film, and no external electromagnetic induction layer is required, which hardly increases the overall thickness of the display module and the electronic device, greatly facilitating the thinning and lightening solution of the electronic device. In addition, by integrating the electromagnetic induction coil into the base layer, a thin, rollable or foldable flexible rollable or foldable display screen can be realized.

[0083] It should be noted that the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0084] The above descriptions are only some embodiments of the present application, and do not limit the protection scope of the present application. Any equivalent device or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A display module, characterized in that: It comprises a device layer and a base layer which are stacked, wherein the base layer is arranged away from a light emitting surface of the device layer; The device layer includes a driving circuit and a light-emitting element which are stacked, the driving circuit is arranged close to the base layer, and the light-emitting element is arranged away from the base layer; the driving circuit is used to drive the light-emitting element to emit light; The base layer comprises a first base film, an electromagnetic induction layer and a second base film which are stacked in sequence, the first base film is far away from the device layer, and the second base film is close to the device layer; the projection area of ​​the electromagnetic induction layer on the device layer does not exceed the projection area of ​​the first base film or the second base film on the device layer; The thickness of the electromagnetic induction layer is no more than 1 μm, the thickness of the first base film is 8 to 10 μm, and the thickness of the second base film is 8 to 10 μm; The electromagnetic induction layer comprises a first induction coil and a second induction coil which are stacked, and the first induction coil and the second induction coil are insulated; wherein the first induction coil is arranged on the first base film, and the second induction coil is arranged on a side of the second base film close to the first base film; An insulating layer is provided between the first induction coil and the second induction coil; the insulating layer is made of inorganic material; The display module further comprises a polarizing layer, an encapsulation layer, an inorganic layer and a buffer layer which are stacked in sequence; the buffer layer is arranged on a side of the base layer away from the device layer, the inorganic layer is arranged between the base layer and the device layer, and the encapsulation layer is arranged on a side of the device layer away from the base layer; the polarizing layer is arranged on a side of the encapsulation layer away from the device layer, and the polarizing layer and the encapsulation layer are connected by colloid bonding; The polarizing layer includes a stacked wave plate, a pressure-sensitive adhesive layer, a polyvinyl alcohol film and a triacetyl cellulose film. The wave plate is arranged close to the encapsulation layer and is bonded to the encapsulation layer through a colloid. The triacetyl cellulose film is provided with two layers, and the polyvinyl alcohol film is provided between the two layers of the triacetyl cellulose film.

2. The display module according to claim 1, characterized in that: The first induction coil is protruded from the surface of the first base film close to the second base film, the second induction coil is protruded from the surface of the second base film close to the first base film, and the first induction coil and the second induction coil are spaced apart; the insulating layer is filled between the first induction coil and the second induction coil, and covers the first induction coil and the second induction coil.

3. The display module according to claim 1, characterized in that: The first induction coil and the second induction coil adopt a titanium-aluminum composite layer structure or a molybdenum-aluminum composite layer structure, wherein the aluminum layer in the titanium-aluminum composite layer structure is arranged between titanium layers, and the aluminum layer in the molybdenum-aluminum composite layer structure is arranged between molybdenum layers.

4. The display module according to claim 1, characterized in that: The thickness of the electromagnetic induction layer is 0.5-0.9 μm.

5. An electronic device, characterized in that: It comprises a shell, a display screen cover plate and the display module according to any one of claims 1 to 4, wherein the display screen cover plate is attached to the display surface of the display module, the shell is connected to the display screen cover plate, and together they enclose a containing space, and the display module is arranged in the containing space.

6. A touch control system, characterized in that: It comprises a stylus and the electronic device as claimed in claim 5, wherein the stylus is used to touch the display area of ​​the electronic device to realize command input; wherein the stylus is an electromagnetic pen, and the induction coil in the electromagnetic pen cooperates with the electromagnetic induction layer of the electronic device to realize signal reception and transmission.

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