CN114822233A

CN114822233A - Foldable display device and electronic equipment

Info

Publication number: CN114822233A
Application number: CN202110183466.XA
Authority: CN
Inventors: 徐富国; 吴康; 梁霄; 汪杰
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-01-18
Filing date: 2021-02-10
Publication date: 2022-07-29

Abstract

The application provides a display device and an electronic apparatus including the same, the display device including: a display panel; first and second ultra-thin glasses stacked on both sides of the display panel; the first pasting layer is positioned between the display panel and the first ultrathin glass; the second adhesive layer is positioned between the display panel and the second ultrathin glass; wherein a stacked structure composed of the first ultra-thin glass, the first paste layer, the display panel, the second paste layer, and the second ultra-thin glass is divided into a first area, a second area, and a folding area, wherein the folding area is located between the first area and the second area; wherein the first adhesive layer and the second adhesive layer have a modulus of elasticity of 15Kpa to 100Kpa. The application provides a display device and electronic equipment who has display device can solve folding screen and arch the problem at the buckle that folds repeatedly and appear, helps improving user experience.

Description

Foldable display device and electronic equipment

The present application claims priority from the chinese patent application entitled "a foldable display device and electronic apparatus" filed by the chinese patent office on 18/01/2021 with application number 202110063298.0, the entire contents of which are incorporated herein by reference.

Technical Field

The embodiment of the application relates to the technical field of display, in particular to a foldable display device and electronic equipment.

Background

With the continuous development of the technology, the foldable screen becomes a development trend of future mobile electronic products. The terminal adopting the folding screen can be freely unfolded and folded, so that the user experience is enhanced. The folding screen can provide more display area and improve the display effect in the unfolded state. When folded, the portable bag is convenient for users to carry.

However, after the folding screen is repeatedly folded, the problem of bending and arching can occur in a folding area, so that the flatness is poor, and the user experience is influenced.

Disclosure of Invention

The application provides a display device and electronic equipment who has display device can solve folding screen and arch the problem at the buckle that folds repeatedly and appear, helps improving user experience.

In a first aspect, there is provided a foldable display device, comprising: a display panel; a third ultra-thin glass and a second ultra-thin glass stacked on both sides of the display panel; the first pasting layer is positioned between the display panel and the first ultrathin glass; the second adhesive layer is positioned between the display panel and the second ultrathin glass; wherein a stacked structure composed of the first ultra-thin glass, the first adhesive layer, the display panel, the second adhesive layer, and the second ultra-thin glass is divided into a first region, a second region, and a folding region, wherein the folding region is located between the first region and the second region, and the first region and the second region are folded in half or unfolded along the folding region; wherein the first adhesive layer and the second adhesive layer have an elastic modulus ranging from 15Kpa to 100Kpa.

As shown in fig. 4, the display panel 205 has an ultra-thin glass 2031 and an ultra-thin glass 2032 on both sides, wherein the display panel 205, the ultra-thin glass 2031 and the ultra-thin glass 2032 are stacked. The adhesive layer a6 is located between the display panel 205 and the ultra-thin glass 2032, and the adhesive layer a4 is located between the display panel 205 and the ultra-thin glass 2031. The foldable display device may be divided into a non-bending region, and a bending region. An adhesive layer a6 and an adhesive layer a4 with low elastic modulus are used on both sides of the display panel 205, wherein the adhesive layer a6 and the adhesive layer a4 are stacked on both sides of the display panel. Because the layer of pasting of low elastic modulus has lower shear stress value, adopt low elastic modulus's the collapsible performance of buckling that the layer of pasting can strengthen display module assembly, buckle the in-process at display module assembly and release the stress of buckling, the recovery exhibition flat that can be more quick can strengthen display module assembly's collapsible performance of buckling, avoids display module assembly to damage when folding.

Through the experiment, the flattening angle of the display device without using the ultrathin glass after static bending is 70 degrees, the first piece of ultrathin glass is used above the display panel, the second piece of ultrathin glass is used below the display panel, the flattening angle of the display device using the ultrathin glass after static bending is 100 degrees, and the bending and arching degree of the display device is greatly reduced.

With reference to the first aspect, in some possible implementations of the first aspect, the adhesive layer has an elastic modulus of 30Kpa, 45Kpa, or 50 Kpa.

Through adopting the layer of pasting that elasticity modulus is 30Kpa, 45Kpa or 50Kpa, when the foldable bending performance of reinforcing display module assembly, paste the layer and also can keep the adhesion, can be better play the bonding effect, prevent to send the dropout phenomenon because of bonding insecure between the display module assembly functional layer.

With reference to the first aspect, in some possible implementations of the first aspect, an elastic modulus of the first adhesive layer is different from an elastic modulus of the second adhesive layer.

Through the layer of pasting that adopts different elastic modulus in display panel one side (for example, the side of being shaded), can strengthen display module assembly's folding bending performance in the time, also can provide the holding power for the folding exhibition of folding back of display module assembly.

With reference to the first aspect, in some possible implementations of the first aspect, the first adhesive layer and/or the second adhesive layer have different elastic moduli in the bending region and the non-bending region.

With reference to the first aspect, in some possible implementations of the first aspect, the first adhesive layer and/or the second adhesive layer have a gradient elastic modulus (e.g., the adhesive layer has a smaller elastic modulus closer to the bending region, or the adhesive layer has a gradient elastic modulus in the thickness direction).

With reference to the first aspect, in some possible implementations of the first aspect, an elastic modulus of the first adhesive layer and/or the second adhesive layer in the bending region is smaller than an elastic modulus of the second adhesive layer in the non-bending region.

The adhesive layers with different elastic moduli are adopted in the bending area and the non-bending area, so that the foldable bending performance of the display module can be enhanced, and the supporting force required by the bending of the display module can be restored after the display module is bent.

With reference to the first aspect, in some possible implementations of the first aspect, the first adhesive layer and the second adhesive layer have a thickness of at least 15 um.

With reference to the first aspect, in some possible implementations of the first aspect, the first pasting layer and the second pasting layer on both sides of the display panel have a thickness ranging from 15um to 45um, wherein the pasting layers are stacked on both sides of the display panel.

With reference to the first aspect, in some possible implementations of the first aspect, the thickness of the first pasting layer and the second pasting layer is 75um,100um,125um, or 150 um. Can be like this when reinforcing display module assembly's folding bending performance, can not show the thickness that increases display module assembly, keep good user experience.

With reference to the first aspect, in some possible implementations of the first aspect, a thickness of the first adhesive layer and/or the second adhesive layer is different between the bending region and the non-bending region.

Optionally, the thickness of the first adhesive layer and/or the second adhesive layer is greater in the bending region than in the non-bending region.

Optionally, the thickness of the first adhesive layer and/or the second adhesive layer is gradually changed from the bending region to the non-bending region, for example, the closer to the bending region, the greater the thickness of the adhesive layer.

Optionally, the thickness of the first adhesive layer and/or the second adhesive layer changes stepwise from the bending region to the non-bending region.

Adopt thickness to paste the layer in the bending zone difference with non-bending zone, can be in the folding bending performance of reinforcing display module assembly, can not show the thickness that increases display module assembly, keep good user experience.

The adoption thickness is at the layer of pasting of bending zone and non-bending zone gradual change, can be so that shear stress presents a gradual change state in bending zone and non-bending zone, avoids folding display module assembly bending zone and non-bending zone's display panel atress sudden change to cause display module assembly to be damaged when folding.

With reference to the first aspect, in some possible implementations of the first aspect, the foldable display device further includes: a third adhesive layer and a back film stacked on the same side of the display panel; wherein the third adhesive layer and the back film are both positioned between the display panel and the first ultra-thin glass; wherein the third adhesive layer is positioned between the back film and the first ultra-thin glass.

For example, as shown in fig. 7, the adhesive layer a5 and the back film 207 are stacked on the same side of the display panel 205, and both the adhesive layer a5 and the back film 207 are located between the display panel 205 and the ultra-thin glass 2032; wherein the adhesive layer a5 is located between the back film 207 and the ultra-thin glass 2032.

The back film is placed between the ultrathin glass and the display panel, the ultrathin glass can provide flattening force for the display panel, the display panel keeps flat after being bent, and meanwhile, the back film can be protected to prevent the back film from being damaged. In other words, the ultra-thin glass can protect the back film and the display panel at the same time, and can improve the impact resistance of the display device.

With reference to the first aspect, in some possible implementations of the first aspect, the foldable display device further includes: a fourth adhesive layer and a polarizer stacked on the same side of the display panel; wherein the fourth adhesive layer and the polarizer are both located between the display panel and the second ultra-thin glass, and wherein the fourth adhesive layer is located between the polarizer and the second ultra-thin glass.

For example, as shown in fig. 7, the adhesive layer A3 and the polarizer 204 are stacked on the same side of the display panel 205, the adhesive layer A3 and the polarizer 204 are both located between the display panel 205 and the ultra-thin glass 2031, and the adhesive layer A3 is located between the polarizer 204 and the ultra-thin glass 2031.

The polarizer is arranged between the ultrathin glass and the display panel, the ultrathin glass can provide flattening force for the display panel to ensure that the display panel is kept flat after being bent, and meanwhile, the advantage of high hardness of the ultrathin glass can be utilized to protect the polarizer and prevent the polarizer from being damaged;

with reference to the first aspect, in some possible implementations of the first aspect, the foldable display device further includes: the touch layer and the fifth pasting layer are stacked on the same side of the display panel; wherein the touch layer and a fifth adhesive layer are positioned between the second ultra-thin glass and the polarizer. The fifth pasting layer is located between the second ultrathin glass and the touch layer.

For example, as shown in fig. 7, a touch layer (not shown) and an adhesive layer (not shown) stacked on the same side of the display panel 205, wherein the touch layer and the adhesive 2 may be located between the ultra-thin glass 2031 and the polarizer 204, and the adhesive layer is located between the ultra-thin glass 2031 and the touch layer.

By placing the touch layer on the light exit side of the polarizer 204, the touch layer is closer to the cover 2011, and the user can obtain better touch experience.

With reference to the first aspect, in some possible implementations of the first aspect, the display panel may include: the organic light emitting diode comprises an encapsulation layer, an organic light emitting device layer and a touch layer, wherein the encapsulation layer, the organic light emitting device layer and the touch layer form a stacked structure.

For example, as shown in fig. 5B, the display panel 205 may include an encapsulation layer 2054, an organic light emitting device layer 2053, and a touch layer 209.

Through with touch-control layer integration in display panel, can effectively reduce folding screen display module's thickness, damaged when can avoiding buckling simultaneously.

With reference to the first aspect, in some possible implementations of the first aspect, the touch layer may include a third ultra-thin glass.

Compare in the touch-control layer of built-in integrated PET (Polyethylene Terephthalate), the touch-control layer that the integration has ultra-thin glass can have better anti ball-dropping ability, possesses better straining force simultaneously to be damaged when avoiding buckling.

With reference to the first aspect, in some possible implementations of the first aspect, the refractive indices of the first adhesive layer, the second adhesive layer, the third adhesive layer, the fourth adhesive layer, and the fifth adhesive layer are in a range from 1.5 to 1.8.

Because the organic polymer film material is adopted in a large number to folding display device, for example CPI (clear Polyimide), wherein the refracting index of CPI is 1.6, and the refracting index of the layer of pasting that uses at present is 1.47, and it is not good with other organic polymer film material refracting index matching to paste the layer, leads to the reflectivity increase at each interface of display module stromatolite, and the transmissivity degree reduces, leads to display device's luminous efficacy to receive very big influence. Optionally, the adhesive layer with a refractive index of 1.5 is selected, so that the optical transmittance of the display module can be greatly improved, and the optical reflectivity of the display module can be reduced. Optionally, the refractive index of the adhesive layer ranges from 1.5 to 1.8. In some embodiments, the refractive index of each bonding layer may be different for the bonding layers in the above embodiments.

In combination with the first aspect, in certain possible implementations of the first aspect, the polarizer is a coated polarizer.

By adopting the coating polaroid, the thickness of the display device can be effectively reduced, and the user experience is improved.

With reference to the first aspect, in some possible implementation manners of the first aspect, the first adhesive layer, the second adhesive layer, the third adhesive layer, the fourth adhesive layer, and the fifth adhesive layer are foldable optically transparent adhesives.

With reference to the first aspect, in some possible implementation manners of the first aspect, the foldable display device further includes a supporting structure and a sixth pasting layer, where the supporting structure, the sixth pasting layer and the first ultra-thin glass are stacked structures, the supporting structure and the sixth pasting layer are both located on the same side of the first ultra-thin glass, and the sixth pasting layer is located between the supporting structure and the first ultra-thin glass.

With reference to the first aspect, in some possible implementations of the first aspect, the support structure includes: the device comprises a hollow area, a first non-hollow area and a second non-hollow area, wherein the hollow area is located between the first non-hollow area and the second non-hollow area.

For example, as shown in fig. 6, the bending region is of a hollow structure, and the non-bending region (including the first non-bending region and the second non-bending region) is of a non-hollow structure to support the display module, so that the bendable characteristic is satisfied, and meanwhile, the good supporting force can be provided for the non-bending region and the bending region, the degree of bending and arching is reduced, and the flatness of the display module after folding and unfolding is increased.

With reference to the first aspect, in some possible implementations of the first aspect, the support structure has a thickness of 50um to 200um.

With reference to the first aspect, in some possible implementations of the first aspect, the support structure may be a metal structure.

With reference to the first aspect, in some possible implementations of the first aspect, the pattern of the hollowed-out area in the support structure may also be one or more combinations of shapes such as a rectangle, a triangle, and a circle.

With reference to the first aspect, in some possible implementation manners of the first aspect, the foldable display device further includes a supporting component, wherein the supporting component is located between the back membrane and the supporting structure, and the supporting component, the back membrane, and the supporting structure are stacked structures.

With reference to the first aspect, in certain possible implementations of the first aspect, the support member may be at least one of a sheet of sus (steel Use stainless) steel, a sheet of copper, a sheet of aluminum, or a metal alloy.

With reference to the first aspect, in some possible implementations of the first aspect, the thickness of the support component is 30 um.

In a second aspect, a foldable electronic device is provided, wherein the electronic device comprises the display device of the first aspect.

Drawings

Fig. 1 is a schematic structural diagram of an electronic device provided in an embodiment of the present application.

Fig. 2 is a block diagram of a software structure of an electronic device according to an embodiment of the present application.

Fig. 3A-3B are schematic diagrams illustrating a foldable electronic device including a foldable display device according to an embodiment of the present application.

Fig. 3C-3D are schematic diagrams illustrating a foldable electronic device with bending and arching problems according to an embodiment of the present application.

Fig. 4 is a schematic diagram illustrating a foldable display device according to an embodiment of the present application.

Fig. 5A-5B are schematic views illustrating a display panel according to an embodiment of the present disclosure.

Fig. 6 is a schematic diagram of a support structure according to an embodiment of the present disclosure.

Fig. 7 is a schematic diagram illustrating another foldable display device provided in an embodiment of the present application.

Detailed Description

The terminology used in the description of the embodiments of the present application is for the purpose of describing particular embodiments of the present application only and is not intended to be limiting of the application, as the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Fig. 1 illustrates a schematic structure diagram of an electronic device 100.

The electronic device 100 may include at least one of a cell phone, a tablet computer, a desktop computer, a laptop computer, a handheld computer, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a cellular phone, a Personal Digital Assistant (PDA), an Augmented Reality (AR) device, a Virtual Reality (VR) device, an Artificial Intelligence (AI) device, a wearable device, an in-vehicle device, a smart home device, or a smart city device. The embodiment of the present application does not particularly limit the specific type of the electronic device 100.

The electronic device 100 may include a processor 110, an external memory interface 120, an internal memory 121, a Universal Serial Bus (USB) connector 130, a charging management module 140, a power management module 141, a battery 142, an antenna 1, an antenna 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, a sensor module 180, a key 190, a motor 191, an indicator 192, a camera 193, a display screen 194, a Subscriber Identification Module (SIM) card interface 195, and the like. The sensor module 180 may include a pressure sensor 180A, a gyroscope sensor 180B, an air pressure sensor 180C, a magnetic sensor 180D, an acceleration sensor 180E, a distance sensor 180F, a proximity light sensor 180G, a fingerprint sensor 180H, a temperature sensor 180J, a touch sensor 180K, an ambient light sensor 180L, a bone conduction sensor 180M, and the like.

It is to be understood that the illustrated structure of the embodiment of the present application does not specifically limit the electronic device 100. In other embodiments of the present application, electronic device 100 may include more or fewer components than shown, or some components may be combined, some components may be split, or a different arrangement of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

Processor 110 may include one or more processing units, such as: the processor 110 may include an Application Processor (AP), a modem processor, a Graphics Processing Unit (GPU), an Image Signal Processor (ISP), a controller, a video codec, a Digital Signal Processor (DSP), a baseband processor, and/or a neural-Network Processing Unit (NPU), etc. The different processing units may be separate devices or may be integrated into one or more processors.

The processor can generate an operation control signal according to the instruction operation code and the timing signal to complete the control of instruction fetching and instruction execution.

A memory may also be provided in processor 110 for storing instructions and data. In some embodiments, the memory in the processor 110 may be a cache memory. The memory may store instructions or data that have been used or used more frequently by the processor 110. If the processor 110 needs to use the instruction or data, it can be called directly from the memory. Avoiding repeated accesses reduces the latency of the processor 110, thereby increasing the efficiency of the system.

In some embodiments, processor 110 may include one or more interfaces. The interface may include an integrated circuit (I2C) interface, an integrated circuit built-in audio (I2S) interface, a Pulse Code Modulation (PCM) interface, a universal asynchronous receiver/transmitter (UART) interface, a Mobile Industry Processor Interface (MIPI), a general-purpose input/output (GPIO) interface, a Subscriber Identity Module (SIM) interface, and/or a Universal Serial Bus (USB) interface, etc. The processor 110 may be connected to modules such as a touch sensor, an audio module, a wireless communication module, a display, a camera, etc. through at least one of the above interfaces.

It should be understood that the interface connection relationship between the modules illustrated in the embodiments of the present application is only an illustration, and does not limit the structure of the electronic device 100. In other embodiments of the present application, the electronic device 100 may also adopt different interface connection manners or a combination of multiple interface connection manners in the above embodiments.

The USB connector 130 is an interface conforming to the USB standard specification, and may be used to connect the electronic device 100 and a peripheral device, and specifically may be a Mini USB connector, a Micro USB connector, a USB Type C connector, and the like. The USB connector 130 may be used to connect a charger to charge the electronic device 100, or may be used to connect other electronic devices to transmit data between the electronic device 100 and other electronic devices. And the audio output device can also be used for connecting a headset and outputting audio stored in the electronic equipment through the headset. The connector can also be used to connect other electronic devices, such as VR devices and the like. In some embodiments, the standard specifications for the universal serial bus may be USB1.x, USB2.0, USB3.x, and USB 4.

The charging management module 140 is used for receiving charging input of the charger. The charger may be a wireless charger or a wired charger. In some wired charging embodiments, the charging management module 140 may receive charging input from a wired charger via the USB interface 130. In some wireless charging embodiments, the charging management module 140 may receive a wireless charging input through a wireless charging coil of the electronic device 100. The charging management module 140 may also supply power to the electronic device through the power management module 141 while charging the battery 142.

The power management module 141 is used to connect the battery 142, the charging management module 140 and the processor 110. The power management module 141 receives input from the battery 142 and/or the charge management module 140, and supplies power to the processor 110, the internal memory 121, the display 194, the camera 193, the wireless communication module 160, and the like. The power management module 141 may also be used to monitor parameters such as battery capacity, battery cycle count, battery state of health (leakage, impedance), etc. In other embodiments, the power management module 141 may be disposed in the processor 110. In other embodiments, the power management module 141 and the charging management module 140 may be disposed in the same device.

The wireless communication function of the electronic device 100 may be implemented by the antenna 1, the antenna 2, the mobile communication module 150, the wireless communication module 160, a modem processor, a baseband processor, and the like.

The antennas 1 and 2 are used for transmitting and receiving electromagnetic wave signals. Each antenna in the electronic device 100 may be used to cover a single or multiple communication bands. Different antennas can also be multiplexed to improve the utilization of the antennas. For example: the antenna 1 may be multiplexed as a diversity antenna of a wireless local area network. In other embodiments, the antenna may be used in conjunction with a tuning switch.

The mobile communication module 150 may provide a solution including 2G/3G/4G/5G wireless communication applied to the electronic device 100. The mobile communication module 150 may include at least one filter, a switch, a power amplifier, a Low Noise Amplifier (LNA), and the like. The mobile communication module 150 may receive the electromagnetic wave from the antenna 1, filter, amplify, etc. the received electromagnetic wave, and transmit the electromagnetic wave to the modem processor for demodulation. The mobile communication module 150 may also amplify the signal modulated by the modem processor, and convert the signal into electromagnetic wave through the antenna 1 to radiate the electromagnetic wave. In some embodiments, at least some of the functional modules of the mobile communication module 150 may be disposed in the processor 110. In some embodiments, at least some of the functional modules of the mobile communication module 150 may be disposed in the same device as at least some of the modules of the processor 110. The modem processor may include a modulator and a demodulator. The modulator is used for modulating a low-frequency baseband signal to be transmitted into a medium-high frequency signal. The demodulator is used for demodulating the received electromagnetic wave signal into a low-frequency baseband signal. The demodulator then passes the demodulated low frequency baseband signal to a baseband processor for processing. The low frequency baseband signal is processed by the baseband processor and then transferred to the application processor. The application processor outputs a sound signal through an audio device (not limited to the speaker 170A, the receiver 170B, etc.) or displays an image or video through the display screen 194. In some embodiments, the modem processor may be a stand-alone device. In other embodiments, the modem processor may be provided in the same device as the mobile communication module 150 or other functional modules, independent of the processor 110.

The wireless communication module 160 may provide a solution for wireless communication applied to the electronic device 100, including Wireless Local Area Networks (WLANs) (e.g., wireless fidelity (Wi-Fi) networks), bluetooth (bluetooth, BT), Bluetooth Low Energy (BLE), Ultra Wide Band (UWB), Global Navigation Satellite System (GNSS), Frequency Modulation (FM), short-range wireless communication (NFC), infrared (infrared, IR), and the like. The wireless communication module 160 may be one or more devices integrating at least one communication processing module. The wireless communication module 160 receives electromagnetic waves via the antenna 2, performs frequency modulation and filtering processing on electromagnetic wave signals, and transmits the processed signals to the processor 110. The wireless communication module 160 may also receive a signal to be transmitted from the processor 110, perform frequency modulation and amplification on the signal, and convert the signal into electromagnetic waves through the antenna 2 to radiate the electromagnetic waves.

In some embodiments, antenna 1 of electronic device 100 is coupled to mobile communication module 150 and antenna 2 is coupled to wireless communication module 160 so that electronic device 100 can communicate with networks and other electronic devices through wireless communication techniques. The wireless communication technology may include global system for mobile communications (GSM), General Packet Radio Service (GPRS), code division multiple access (code division multiple access, CDMA), Wideband Code Division Multiple Access (WCDMA), time-division code division multiple access (time-division code division multiple access, TD-SCDMA), Long Term Evolution (LTE), LTE, BT, GNSS, WLAN, NFC, FM, and/or IR technologies, etc. The GNSS may include a Global Positioning System (GPS), a global navigation satellite system (GLONASS), a beidou navigation satellite system (BDS), a quasi-zenith satellite system (QZSS), and/or a Satellite Based Augmentation System (SBAS).

The electronic device 100 may implement display functions via the GPU, the display screen 194, and the application processor, among others. The GPU is a microprocessor for image processing, and is connected to the display screen 194 and an application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. The processor 110 may include one or more GPUs that execute program instructions to generate or alter display information.

The display screen 194 is used to display images, video, and the like. The display screen 194 includes a display panel. The display panel may adopt a Liquid Crystal Display (LCD), an organic light-emitting diode (OLED), an active-matrix organic light-emitting diode (active-matrix organic light-emitting diode, AMOLED), a flexible light-emitting diode (FLED), a miniature, a Micro-oeld, a quantum dot light-emitting diode (QLED), and the like. In some embodiments, the electronic device 100 may include 1 or more display screens 194.

In some embodiments, the Display screen 194 may be an Organic Light-Emitting Diode (OLED) Display screen or a Liquid Crystal Display (LCD) Display screen. It should be understood that the display screen 194 may include a display for outputting display content to a user and a touch device for receiving touch events input by the user on the display screen 10. In some embodiments, the display 194 is a foldable display. In some embodiments, the display screen 194 may be a flexible OLED (Organic Light-Emitting Diode) display screen. In some embodiments, the Display screen 194 may also be a flexible OLCD (Organic Liquid-Crystal Display) Display screen.

The electronic device 100 may implement a camera function through the camera module 193, the ISP, the video codec, the GPU, the display screen 194, the application processor AP, the neural network processor NPU, and the like.

The camera module 193 can be used to collect color image data and depth data of a subject. The ISP can be used to process color image data collected by the camera module 193. For example, when a photo is taken, the shutter is opened, light is transmitted to the camera photosensitive element through the lens, the optical signal is converted into an electrical signal, and the camera photosensitive element transmits the electrical signal to the ISP for processing and converting into an image visible to naked eyes. The ISP can also carry out algorithm optimization on the noise, brightness and skin color of the image. The ISP can also optimize parameters such as exposure, color temperature and the like of a shooting scene. In some embodiments, the ISP may be provided in the camera module 193.

In some embodiments, the camera module 193 may be composed of a color camera module and a 3D sensing module.

In some embodiments, the light sensing element of the camera of the color camera module may be a Charge Coupled Device (CCD) or a complementary metal-oxide-semiconductor (CMOS) phototransistor. The light sensing element converts the optical signal into an electrical signal, which is then passed to the ISP where it is converted into a digital image signal. And the ISP outputs the digital image signal to the DSP for processing. The DSP converts the digital image signal into image signal in standard RGB, YUV and other formats.

In some embodiments, the 3D sensing module may be a (time of flight) 3D sensing module or a structured light (structured light)3D sensing module. The structured light 3D sensing is an active depth sensing technology, and the basic components of the structured light 3D sensing module may include an Infrared (infra) emitter, an IR camera module, and the like. The working principle of the structured light 3D sensing module is that light spots (patterns) with specific patterns are transmitted to a shot object, light spot pattern codes (light coding) on the surface of the object are received, the difference and the similarity of the light spots and the original projected light spots are compared, and the three-dimensional coordinates of the object are calculated by utilizing the trigonometric principle. The three-dimensional coordinates include the distance from the electronic device 100 to the object to be photographed. The TOF3D sensing module may be an active depth sensing technology, and the basic components of the TOF3D sensing module may include an Infrared (infra) emitter, an IR camera module, and the like. The working principle of the TOF3D sensing module is to calculate the distance (i.e. depth) between the TOF3D sensing module and the object to be photographed through the time of infrared ray foldback so as to obtain a 3D depth-of-field map.

The structured light 3D sensing module can also be applied to the fields of face recognition, motion sensing game machines, industrial machine vision detection and the like. The TOF3D sensing module can also be applied to the fields of game machines, Augmented Reality (AR)/Virtual Reality (VR), etc.

In other embodiments, the camera module 193 may also be composed of two or more cameras. The two or more cameras may include color cameras that may be used to collect color image data of the object being photographed. The two or more cameras may employ stereo vision (stereo vision) technology to acquire depth data of a photographed object. The stereoscopic vision technology is based on the principle of human eye parallax, and obtains distance information, i.e., depth information, between the electronic device 100 and an object to be photographed by photographing images of the same object from different angles through two or more cameras under a natural light source and performing calculations such as triangulation.

In some embodiments, the electronic device 100 may include 1 or more camera modules 193. Specifically, the electronic device 100 may include 1 front camera module 193 and 1 rear camera module 193. The front camera module 193 can be generally used to collect the color image data and depth data of the photographer facing the display screen 194, and the rear camera module can be used to collect the color image data and depth data of the photographed object (such as people and scenery) facing the photographer.

In some embodiments, the CPU or GPU or NPU in the processor 110 may process the color image data and depth data acquired by the camera module 193. In some embodiments, the NPU may identify color image data collected by the camera module 193 (specifically, the color camera module) through a neural network algorithm, such as a convolutional neural network algorithm (CNN), on which a bone point identification technique is based, to determine bone points of a person being photographed. The CPU or GPU can also run a neural network algorithm to determine the bone points of the shot person according to the color image data. In some embodiments, the CPU or the GPU or the NPU may also be configured to determine the size of the person to be photographed (e.g., the body proportion, the thickness of the body part between the bone points) according to the depth data collected by the camera module 193 (which may be a 3D sensing module) and the identified bone points, and further determine a body beautification parameter for the person to be photographed, and finally process the photographed image of the person to be photographed according to the body beautification parameter, so as to beautify the body shape of the person to be photographed in the photographed image. In the following embodiments, how to perform the body beautifying processing on the image of the person to be shot based on the color image data and the depth data acquired by the camera module 193 will be described in detail, which is not repeated herein.

The digital signal processor is used for processing digital signals, and can also process other digital signals. For example, when the electronic device 100 selects a frequency bin, the digital signal processor is used to perform fourier transform or the like on the frequency bin energy.

Video codecs are used to compress or decompress digital video. The electronic device 100 may support one or more video codecs. In this way, the electronic device 100 may play or record video in a variety of encoding formats, such as: moving Picture Experts Group (MPEG) 1, MPEG2, MPEG3, MPEG4, and the like.

The NPU is a neural-network (NN) computing processor that processes input information quickly by using a biological neural network structure, for example, by using a transfer mode between neurons of a human brain, and can also learn by itself continuously. Applications such as intelligent recognition of the electronic device 100 can be realized through the NPU, for example: image recognition, face recognition, speech recognition, text understanding, and the like.

The external memory interface 120 may be used to connect an external memory card, such as a Micro SD card, to extend the memory capability of the electronic device 100. The external memory card communicates with the processor 110 through the external memory interface 120 to implement a data storage function. For example, files such as music, video, etc. are saved in an external memory card. Or files such as music, video, etc. are transferred from the electronic device to the external memory card.

The internal memory 121 may be used to store computer executable program code, which includes instructions. The internal memory 121 may include a program storage area and a data storage area. The storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required by at least one function, and the like. The storage data area may store data (such as audio data, phone book, etc.) created during use of the electronic device 100, and the like. In addition, the internal memory 121 may include a high-speed random access memory, and may further include a nonvolatile memory, such as at least one magnetic disk storage device, a flash memory device, a universal flash memory (UFS), and the like. The processor 110 performs various functional methods or data processing of the electronic device 100 by executing instructions stored in the internal memory 121 and/or instructions stored in a memory provided in the processor.

The electronic device 100 may implement audio functions via the audio module 170, the speaker 170A, the receiver 170B, the microphone 170C, the headphone interface 170D, and the application processor. Such as music playing, recording, etc.

The audio module 170 is used to convert digital audio information into an analog audio signal output and also to convert an analog audio input into a digital audio signal. The audio module 170 may also be used to encode and decode audio signals. In some embodiments, the audio module 170 may be disposed in the processor 110, or some functional modules of the audio module 170 may be disposed in the processor 110.

The speaker 170A, also called a "horn", is used to convert the audio electrical signal into an acoustic signal. The electronic apparatus 100 can listen to music through the speaker 170A or output an audio signal for handsfree phone call.

The receiver 170B, also called "earpiece", is used to convert the electrical audio signal into an acoustic signal. When the electronic apparatus 100 receives a call or voice information, it can receive voice by placing the receiver 170B close to the ear of the person.

The microphone 170C, also referred to as a "microphone," is used to convert sound signals into electrical signals. When making a call or transmitting voice information, the user can input a voice signal to the microphone 170C by speaking the user's mouth near the microphone 170C. The electronic device 100 may be provided with at least one microphone 170C. In other embodiments, the electronic device 100 may be provided with two microphones 170C to achieve a noise reduction function in addition to collecting sound signals. In other embodiments, the electronic device 100 may further include three, four or more microphones 170C to collect sound signals, reduce noise, identify sound sources, perform directional recording, and so on.

The headphone interface 170D is used to connect a wired headphone. The headset interface 170D may be the USB interface 130, or may be a 3.5mm open mobile electronic device platform (OMTP) standard interface, a cellular telecommunications industry association (cellular telecommunications industry association of the USA, CTIA) standard interface.

The pressure sensor 180A is used for sensing a pressure signal, and converting the pressure signal into an electrical signal. In some embodiments, the pressure sensor 180A may be disposed on the display screen 194. The pressure sensor 180A can be of a wide variety, such as a resistive pressure sensor, an inductive pressure sensor, a capacitive pressure sensor, and the like. The capacitive pressure sensor may be a sensor comprising at least two parallel plates having an electrically conductive material. When a force acts on the pressure sensor 180A, the capacitance between the electrodes changes. The electronic device 100 determines the strength of the pressure from the change in capacitance. When a touch operation is applied to the display screen 194, the electronic apparatus 100 detects the intensity of the touch operation according to the pressure sensor 180A. The electronic apparatus 100 may also calculate the touched position from the detection signal of the pressure sensor 180A. In some embodiments, the touch operations that are applied to the same touch position but different touch operation intensities may correspond to different operation instructions. For example: and when the touch operation with the touch operation intensity smaller than the first pressure threshold value acts on the short message application icon, executing an instruction for viewing the short message. And when the touch operation with the touch operation intensity larger than or equal to the first pressure threshold value acts on the short message application icon, executing an instruction of newly building the short message.

The gyro sensor 180B may be used to determine the motion attitude of the electronic device 100. In some embodiments, the angular velocity of electronic device 100 about three axes (i.e., the x, y, and z axes) may be determined by gyroscope sensor 180B. The gyro sensor 180B may be used for photographing anti-shake. For example, when the shutter is pressed, the gyro sensor 180B detects a shake angle of the electronic device 100, calculates a distance to be compensated for by the lens module according to the shake angle, controls a lens to move in a reverse direction to counteract the shake of the electronic device 100, and thus achieves anti-shake. The gyroscope sensor 180B may also be used for navigation, somatosensory gaming scenes.

The air pressure sensor 180C is used to measure air pressure. In some embodiments, electronic device 100 calculates altitude, aiding in positioning and navigation based on barometric pressure values measured by barometric pressure sensor 180C.

The magnetic sensor 180D includes a hall sensor. The electronic device 100 may detect the opening and closing of the flip holster using the magnetic sensor 180D. When the electronic device is a foldable electronic device, the magnetic sensor 180D may be used to detect the folding or unfolding, or the folding angle of the electronic device. In some embodiments, when the electronic device 100 is a flip phone, the electronic device 100 may detect the opening and closing of the flip according to the magnetic sensor 180D. And then according to the opening and closing state of the leather sheath or the opening and closing state of the flip cover, the automatic unlocking of the flip cover is set.

The acceleration sensor 180E may detect the magnitude of acceleration of the electronic device 100 in various directions (typically three axes). The magnitude and direction of gravity can be detected when the electronic device 100 is stationary. The method can also be used for identifying the posture of the electronic equipment, and is applied to horizontal and vertical screen switching, pedometers and the like.

A distance sensor 180F for measuring a distance. The electronic device 100 may measure the distance by infrared or laser. In some embodiments, taking a picture of a scene, electronic device 100 may utilize range sensor 180F to range for fast focus.

The proximity light sensor 180G may include, for example, a Light Emitting Diode (LED) and a light detector, such as a photodiode. The light emitting diode may be an infrared light emitting diode. The electronic device 100 emits infrared light to the outside through the light emitting diode. The electronic device 100 detects infrared reflected light from nearby objects using a photodiode. When the intensity of the detected reflected light is greater than a threshold value, it may be determined that there is an object near the electronic device 100. When the intensity of the detected reflected light is less than the threshold, the electronic device 100 may determine that there is no object near the electronic device 100. The electronic device 100 can utilize the proximity light sensor 180G to detect that the user holds the electronic device 100 close to the ear for talking, so as to automatically turn off the screen to achieve the purpose of saving power. The proximity light sensor 180G may also be used in a holster mode, a pocket mode automatically unlocks and locks the screen.

The ambient light sensor 180L may be used to sense ambient light levels. Electronic device 100 may adaptively adjust the brightness of display screen 194 based on the perceived ambient light level. The ambient light sensor 180L may also be used to automatically adjust the white balance when taking a picture. The ambient light sensor 180L may also cooperate with the proximity light sensor 180G to detect whether the electronic device 100 is obscured, such as when the electronic device is in a pocket. When the electronic equipment is detected to be shielded or in a pocket, part of functions (such as a touch function) can be in a disabled state to prevent misoperation.

The fingerprint sensor 180H is used to collect a fingerprint. The electronic device 100 can utilize the collected fingerprint characteristics to unlock the fingerprint, access the application lock, photograph the fingerprint, answer an incoming call with the fingerprint, and so on.

The temperature sensor 180J is used to detect temperature. In some embodiments, electronic device 100 implements a temperature processing strategy using the temperature detected by temperature sensor 180J. For example, when the temperature detected by the temperature sensor 180J exceeds a threshold, the electronic device 100 performs a reduction in the performance of the processor in order to reduce the power consumption of the electronic device to implement thermal protection. In other embodiments, electronic device 100 heats battery 142 when the temperature detected by temperature sensor 180J is below another threshold. In other embodiments, the electronic device 100 may boost the output voltage of the battery 142 when the temperature is below a further threshold.

The touch sensor 180K is also called a "touch device". The touch sensor 180K may be disposed on the display screen 194, and the touch sensor 180K and the display screen 194 form a touch screen, which is also called a "touch screen". The touch sensor 180K is used to detect a touch operation applied thereto or nearby. The touch sensor can communicate the detected touch operation to the application processor to determine the touch event type. Visual output associated with the touch operation may be provided through the display screen 194. In other embodiments, the touch sensor 180K may be disposed on a surface of the electronic device 100, different from the position of the display screen 194.

The bone conduction sensor 180M may acquire a vibration signal. In some embodiments, the bone conduction sensor 180M may acquire a vibration signal of the human vocal part vibrating the bone mass. The bone conduction sensor 180M may also contact the human pulse to receive the blood pressure pulsation signal. In some embodiments, the bone conduction sensor 180M may also be disposed in a headset, integrated into a bone conduction headset. The audio module 170 may analyze a voice signal based on the vibration signal of the bone mass vibrated by the sound part acquired by the bone conduction sensor 180M, so as to implement a voice function. The application processor can analyze heart rate information based on the blood pressure beating signal acquired by the bone conduction sensor 180M, and the heart rate detection function is realized.

The keys 190 may include a power-on key, a volume key, and the like. The keys 190 may be mechanical keys. Or may be touch keys. The electronic apparatus 100 may receive a key input, and generate a key signal input related to user setting and function control of the electronic apparatus 100.

The motor 191 may generate a vibration cue. The motor 191 may be used for incoming call vibration cues, as well as for touch vibration feedback. For example, touch operations applied to different applications (e.g., photographing, audio playing, etc.) may correspond to different vibration feedback effects. The motor 191 may also respond to different vibration feedback effects for touch operations applied to different areas of the display screen 194. Different application scenes (such as time reminding, receiving information, alarm clock, game and the like) can also correspond to different vibration feedback effects. The touch vibration feedback effect may also support customization.

Indicator 192 may be an indicator light that may be used to indicate a state of charge, a change in charge, or a message, missed call, notification, etc.

The SIM card interface 195 is used to connect a SIM card. The SIM card can be brought into and out of contact with the electronic apparatus 100 by being inserted into the SIM card interface 195 or being pulled out of the SIM card interface 195. The electronic device 100 may support 1 or more SIM card interfaces. The SIM card interface 195 may support a Nano SIM card, a Micro SIM card, a SIM card, etc. The same SIM card interface 195 can be inserted with multiple cards at the same time. The types of the plurality of cards may be the same or different. The SIM card interface 195 may also be compatible with different types of SIM cards. The SIM card interface 195 is also compatible with external memory cards. The electronic device 100 interacts with the network through the SIM card to implement functions such as communication and data communication. In some embodiments, the electronic device 100 employs esims, namely: an embedded SIM card. The eSIM card can be embedded in the electronic device 100 and cannot be separated from the electronic device 100.

The software system of the electronic device 100 may employ a hierarchical architecture, an event-driven architecture, a micro-core architecture, a micro-service architecture, or a cloud architecture. The embodiment of the present application takes an Android system with a layered architecture as an example, and exemplarily illustrates a software structure of the electronic device 100.

Fig. 2 is a block diagram of a software structure of the electronic device 100 according to the embodiment of the present application.

The layered architecture divides the software into several layers, each layer having a clear role and division of labor. The layers communicate with each other through a software interface. In some embodiments, the Android system is divided into five layers, from top to bottom, an application Layer, an application framework Layer, an Android Runtime (ART) and native C/C + + libraries, a Hardware Abstraction Layer (HAL), and a kernel Layer.

The application layer may include a series of application packages.

As shown in fig. 2, the application package may include applications such as camera, gallery, calendar, phone call, map, navigation, WLAN, bluetooth, music, video, short message, etc.

The application framework layer provides an Application Programming Interface (API) and a programming framework for the application program of the application layer. The application framework layer includes a number of predefined functions.

As shown in FIG. 2, the application framework layers may include a window manager, content provider, view system, explorer, notification manager, activity manager, input manager, and the like.

The Window Manager provides a Window Management Service (WMS), which may be used for Window management, Window animation management, surface management, and a relay station as an input system.

The content provider is used to store and retrieve data and make it accessible to applications. The data may include video, images, audio, calls made and received, browsing history and bookmarks, phone books, etc.

The view system includes visual controls such as controls to display text, controls to display pictures, and the like. The view system may be used to build applications. The display interface may be composed of one or more views. For example, the display interface including the short message notification icon may include a view for displaying text and a view for displaying pictures.

The resource manager provides various resources for the application, such as localized strings, icons, pictures, layout files, video files, and the like.

The notification manager enables the application to display notification information in the status bar, can be used to convey notification-type messages, can disappear automatically after a brief dwell, and does not require user interaction. Such as a notification manager used to inform download completion, message alerts, etc. The notification manager may also be a notification that appears in the form of a chart or scroll bar text at the top status bar of the system, such as a notification of a background running application, or a notification that appears on the screen in the form of a dialog window. For example, prompting text information in the status bar, sounding a prompt tone, vibrating the electronic device, flashing an indicator light, etc.

The campaign Manager may provide a campaign Manager Service (AMS), which may be used for the start-up, switching, scheduling of system components (e.g., campaigns, services, content providers, broadcast receivers), and the management and scheduling of application processes.

The Input Manager may provide an Input Manager Service (IMS) that may be used to manage inputs to the system, such as touch screen inputs, key inputs, sensor inputs, and the like. The IMS takes the event from the input device node and assigns the event to the appropriate window by interacting with the WMS.

The android runtime comprises a core library and an android runtime. Android runtime is responsible for converting source code into machine code. Android runtime mainly includes adopting Advanced (AOT) compilation technology and Just In Time (JIT) compilation technology.

The core library is mainly used for providing basic functions of the Java class library, such as basic data structure, mathematics, IO, tool, database, network and the like. The core library provides an API for android application development of users.

The native C/C + + library may include a number of functional modules. For example: surface manager (surface manager), Media Framework (Media Framework), libc, OpenGL ES, SQLite, Webkit, etc.

Wherein the surface manager is used for managing the display subsystem and providing the fusion of the 2D and 3D layers for a plurality of application programs. The media framework supports playback and recording of a variety of commonly used audio and video formats, as well as still image files, and the like. The media library may support a variety of audio-video encoding formats, such as MPEG4, h.264, MP3, AAC, AMR, JPG, PNG, and the like. OpenGL ES provides for the rendering and manipulation of 2D graphics and 3D graphics in applications. SQLite provides a lightweight relational database for applications of electronic device 100.

The hardware abstraction layer runs in a user space (user space), encapsulates the kernel layer driver, and provides a calling interface for an upper layer.

The kernel layer is a layer between hardware and software. The inner core layer at least comprises a display driver, a camera driver, an audio driver and a sensor driver.

The following describes exemplary workflow of the software and hardware of the electronic device 100 in connection with capturing a photo scene.

When the touch sensor 180K receives a touch operation, a corresponding hardware interrupt is issued to the kernel layer. The kernel layer processes the touch operation into an original input event (including touch coordinates, a time stamp of the touch operation, and other information). The raw input events are stored at the kernel layer. And the application program framework layer acquires the original input event from the kernel layer and identifies the control corresponding to the input event. Taking the touch operation as a touch click operation, and taking a control corresponding to the click operation as a control of a camera application icon as an example, the camera application calls an interface of an application framework layer, starts the camera application, further starts a camera drive by calling a kernel layer, and captures a still image or a video through the camera 193.

The embodiment of the application provides a foldable display module, wherein the foldable display module can be applied to an electronic device 100.

The foldable display module can be applied to the electronic device 100 due to its foldable property, so that the electronic device 100 is convenient to carry.

The electronic device 100 will be described below as an example.

Fig. 3A is an expanded schematic view of an electronic device 100 with a foldable display module according to an embodiment of the present application. It should be understood that the electronic device 100 having the foldable display module may be referred to as a foldable electronic device.

Fig. 3B is an external view of the electronic device 100 at six different angles, namely, a front side (fig. B) and a back side (fig. f), a bottom side (fig. c) and a top side (fig. d), and a left side (fig. a) and a right side (fig. e). Wherein 10 in the front view (b) is a foldable display module of the electronic device, 20 and 30 in the back view (f) are housings (e.g., the first housing 20 and the second housing 30) of the electronic device 100, and the dashed-line frame shows the bending region 40 of the electronic device 100. It should be understood that in some embodiments, the electronic device 100 may have multiple housings with one inflection region between each two adjacent housings. In some embodiments, the display module of the electronic device 100 may include a plurality of bending regions and the bending regions are distributed continuously (for example, the display module may be a rolling screen).

Fig. 3B is a schematic diagram illustrating a folded state of an electronic device with a foldable display module according to the present application. As shown in fig. 3B, when the two housings are rotated to the folded state, the bending region 40 is deformed and the first housing 20 and the second housing 30 are laminated. When the first casing 20 and the second casing 30 are rotatably connected, the first casing and the second casing may be rotatably connected by using a member capable of being rotatably connected, such as a common rotating shaft.

In addition, a coordinate system as shown in fig. 3B is established in the present application, where x, y and z directions are perpendicular to each other two by two, the z direction can be understood as a thickness direction of the electronic device, the y direction can also be understood as an axis direction of a bending region of the electronic device, and the x direction is perpendicular to the y direction and parallel to a plane of the flexible screen in the unfolded state. The coordinate axes mentioned in this application are all referenced to this coordinate system.

It should be understood that, for any foldable electronic device, the bending regions 40 may also be distributed laterally (along the x direction), and the display module may be folded along the bending regions distributed laterally.

The present application will take the folding manner shown in fig. 3A and fig. 3B as an example to introduce a supporting structure of a folding screen, which solves the problem of bending and arching of the folding screen during the folding process. It should be understood that the folding screen support structure provided by the present application is also applicable to electronic devices with other folding modes, and the folding mode of the screen is not limited by the present application.

In some embodiments, the foldable electronic device may be folded toward a direction in which the left screen and the right screen face each other in the unfolded state, and in some embodiments, the foldable electronic device may also be folded toward a direction in which the left screen and the right screen face each other in the unfolded state, in the description of the embodiments of the present application, the outer surface of the display module 10 shown in fig. 3B after being folded is taken as an example for description, and the folding direction is not limited in the present application.

But folding display module assembly can appear obvious buckling and hunch up the problem after buckling repeatedly, influences the pleasing to the eye of equipment, influences user experience, and this is mainly because folding display module assembly lacks sufficient support. Because the display panel among the collapsible display module assembly adopts organic macromolecular material, and organic macromolecular material is stretched when buckling, forms the unable recovery of plastic deformation, causes the collapsible display module assembly to buckle to arch up, influences user experience.

As shown in fig. 3C and 3D, the electronic device 100 with the foldable display module may be bent and arched after being repeatedly folded. It should be understood that the arching direction and arching position of fig. 3C and 3D are schematic and do not represent specific limitations on the arching direction and arching position.

The problem of bending and arching of the foldable display module has become a difficult problem in the industry, and the appearance and the reliability of the foldable mobile phone are seriously affected.

Before describing the embodiments of the present application, some words are explained.

The functional layer in this embodiment refers to a layer (e.g., a cover plate, a polarizer, a touch layer, a display panel, ultra-thin glass, a back film, a metal support structure, etc.) constituting the screen module, except for an adhesive layer (e.g., a first adhesive layer, a second adhesive layer, etc. in fig. 4).

The ultrathin glass in the embodiment refers to glass which can be applied to a complex structure, has incomparable advantages of common glass, and has the advantages of high temperature resistance, corrosion resistance, high light transmittance, smooth surface, high hardness, good chemical stability, wide application range and the like. In some embodiments, the ultra-thin glass may have a thickness of 0.03mm to 0.5 mm. In the embodiment of the present application, the same functional layer or the same adhesive layer may be divided into a light-emitting side surface and a backlight side surface along a stacking direction (e.g., stacking up and down) of the display module. The "light-exiting side surface" described in this embodiment refers to a surface of one of the functional layers or the adhesive layers closer to an outer surface (a surface capable of directly interacting with a user, for example, the surface 101 shown in fig. 4) of the display module when the display module is in the stacked structure. For example, as shown in fig. 4, the cover 2011 may include a light exit side surface 2011-2 and a backlight side surface 2011-1.

It should also be understood that when the display module is in a vertically stacked structure, the same functional layer or the same adhesive layer may be divided into a light-emitting side direction and a backlight side direction. In the embodiments of the present application, the light emitting side direction refers to an upper side, and the backlight side refers to a lower side. For example, as shown in fig. 4, the first adhesive layer a1 may have a light-emitting side and a backlight side, the cover plate is located on the light-emitting side of the first adhesive layer a1, and the additional layer 2012 is located on the backlight side of the first adhesive layer a 1.

In one embodiment, ultra-thin glass may be placed directly on both sides of the display panel. It should be understood that "directly put on both sides of the flexible display panel" as described herein means that there is only an adhesive layer between the ultra-thin glass and the flexible display panel, and there are no other functional layers. Illustratively, as shown in fig. 4, the ultra-thin glass may be directly placed on both upper and lower sides of the flexible display panel. It should also be understood that the term "on both sides of the display panel" refers to the ultra-thin glass on both sides of the display panel, and the ultra-thin glass and the display panel are in a stacked structure.

Fig. 4 is a cross-sectional view of the display module 10 of the electronic device 100 in an unfolded state. The display module 10 may include a bending region, a first non-bending region, and a second non-bending region. It should be understood that the positions and numbers of the bending regions and the non-bending regions are schematic and do not represent a limitation on the specific structure of the display module 10. In some embodiments, the bending region may be referred to as a folding region, the first non-bending region may be referred to as a first region, and the second non-bending region may be referred to as a second region, wherein the first region and the second region may be folded in half or unfolded along the folding region.

It should also be understood that, in the embodiments of the present application, the display module may also be referred to as a display device.

The display module 10 of the electronic device 100 may be a stacked structure formed by a plurality of lower layers and combinations thereof. Layer 2011: a cover plate;

layer a 1: first adhesive layer

Layer 2012 additional cover plate

Layer A2 second adhesive layer

Layer 204 polarizer

Layer a 3: third adhesive layer

Layer 2031: ultra-thin glass

Layer a 4: the fourth adhesive layer

Layer 205: display panel

Layer a 6: the sixth adhesive layer

Layer 2032: ultra-thin glass;

layer a 5: fifth adhesive layer

Layer 207: back film layer

Layer a 7: the sixth adhesive layer

Layer 208: support structure

The layer 2011 is a cover plate, and may be referred to as a protective layer in some embodiments, and the name of the layer is not specifically limited in this application embodiment. The cover plate can protect the display module 10 from being scratched. The material of the cover plate may be a plastic film PET (Polyethylene Terephthalate). Since the PET film is easily plastically deformed during a long-term bending process, in some embodiments, the material of the cover plate may also be transparent Polyimide (CPI). CPI films may provide higher strain values and may be resistant to high temperatures compared to PET films. In some embodiments, the cover plate may also be Ultra-Thin Glass (UTG). In some embodiments, the cover plate may further include a hardened layer hc (hard coating) (not shown) to obtain the effects of high light transmittance, low haze, friction resistance, high temperature/humidity/high pressure availability, being not easily broken, and good flexibility. In some embodiments, the material of layer 2011 may also be ultra-thin glass.

In some embodiments, the display module 10 may further include a layer 2012. Layer 2012 may be referred to as an additional layer to enhance the impact resistance of the screen. The material selection of the additional layer 2012 can be referred to the cover 2011, and will not be described herein.

The cover sheet and the additional layer are adhered by a first adhesive layer a1 (e.g., optically clear adhesive, pressure sensitive adhesive, heat reactive adhesive).

Layer 204 is a polarizer (e.g., a polarizer). The polarizer may allow unpolarized light to pass through while blocking polarized light, and the polarizer may convert unpolarized light passing through the polarizer into polarized light. Since the natural light incident into the display module from the outside is unpolarized light, the natural light passes through the polarizer and becomes polarized light. When the polarized light encounters an obstruction (e.g., ultra-thin glass 2031, display panel 205) and is reflected, it is blocked by the polarizer. Therefore, the polarizer can effectively block reflected light which is reflected by natural light and propagates out of the layer 2011, and the polarizer plays a role in cutting off ambient light reflection, thereby improving user experience. In some embodiments, the polarizer may be a metal polarizer, an iodine polarizer, a dye polarizer, a polyethylene polarizer, etc., and the type of the polarizer is not particularly limited in this embodiment. In some embodiments, the polarizer may be a coated polarizer. The coating type polaroid can effectively reduce the thickness of the display module and improve the bending performance. By the coating type polarizer, the thickness 67um of the polarizer can be reduced to 5 um. In some embodiments, the polarizer may be a circular polarizer.

In some embodiments where the additional layer 2012 is present, the polarizer 204 and the additional layer 2012 may be adhered by a second adhesive layer a2 (e.g., optically clear adhesive, pressure sensitive adhesive, heat reactive adhesive). In some embodiments, the display module 200 may not include the additional layer 2012, and the polarizer 204 may be adhered to the cover 2011 by the first adhesive layer a1 or the second adhesive layer a2 (e.g., optically clear adhesive, pressure sensitive adhesive, heat reactive adhesive).

The ultrathin glass has good bending property, scratch resistance, water and oxygen resistance, good heat resistance and high light transmittance, and has certain surface hardness, so that the ultrathin glass can be bent and can provide supporting force. In addition, due to the ultrathin characteristic, the ultrathin glass can also reduce the thickness of the display module.

The ultra-thin glass 2031 and the backlight-side surface of the polarizer 204 may be adhered by a third adhesive layer a3 (e.g., optically clear adhesive, pressure sensitive adhesive, heat reactive adhesive). In some embodiments, the thickness of the third adhesive layer a3 is about 50um to provide better adhesion. In some embodiments, the third adhesive layer a3 may be an adhesive with a low shear stress value to enhance the foldable bending performance of the display module and prevent the display module from being damaged when being folded. It should be understood that the shear stress value is used to balance the stretchability of the third adhesive layer. The small value of the shear stress indicates that the third adhesive layer has better stretchability.

In some embodiments, the ultra-thin glass 2031 and the light-emitting side surface of the display panel 205 may be adhered by a fourth adhesive layer a4 (e.g., optically clear adhesive, pressure sensitive adhesive, heat reactive adhesive). The description of the third adhesive layer A3 can be referred to the description of the fourth adhesive layer a4, and will not be repeated herein.

In some embodiments, the display module may not include the ultra-thin glass 2031, and the polarizer and the display panel may be adhered by the third adhesive layer A3 and/or the fourth adhesive layer a 4.

The display module 10 includes a display panel 205.

In some embodiments, the display panel 205 may be a flexible OLED (Organic Light-Emitting Diode) display panel. In some embodiments, the Display panel 205 may also be a flexible OLCD (Organic Liquid-Crystal Display) Display panel. The following description will take a flexible OLED display panel as an example. As shown in fig. 5A, the structure of the flexible OLED display panel may include: a substrate 2051, a driving circuit layer 2052, an organic light emitting device layer 2053, a packaging layer 2054, and a packaging protection layer 2055. The substrate 2051 can provide good water and oxygen barrier performance for an organic light-emitting device layer, and prevent the OLED organic material from being easily reacted and failing when meeting water and/or oxygen. In some embodiments, the substrate 2051 may be made of a PI (Polyimide) film or a PET (Polyethylene Terephthalate) film. In some embodiments, the Organic Light Emitting device layer 2053 may be an active Matrix driving Light Emitting device amoled (active Matrix Organic Light Emitting diode). In some embodiments, the driving circuit layer 2052 may be a Thin Film Transistor (TFT) array, wherein the TFT array determines which pixels of the AMOLED emit light, so as to generate an image. In some embodiments, the TFT array may be modified from conventional amorphous silicon technology (a-Si TFT), Low Temperature polysilicon technology (LTPS TFT) with high carrier mobility, or Organic Thin Film Transistor (OTFT).

In some embodiments, the Organic Light Emitting device layer 2053 may also be a passive Matrix driving Light Emitting device pmoled (passive Matrix Organic Light Emitting diode). The encapsulation layer 2054 can encapsulate the OLED light emitting device to block water and oxygen, thereby preventing water and oxygen from entering the OLED to emit light and causing failure of the OLED light emitting device layer. In some embodiments, the flexible OLED display panel may further include an encapsulation protection layer, wherein the encapsulation protection layer is located at a light emitting side of the flexible OLED display panel. The encapsulation protection layer 2055 can protect the organic light emitting device layer 2053 and the encapsulation layer 2054 and prevent stress deformation when the screen is bent.

In some embodiments, there may also be a touch layer between the package protection layer 2055 and the package layer 2054, as shown in fig. 5B. In some embodiments, the touch layer 209 may be a resistive touch layer, a capacitive touch layer, a surface acoustic wave touch layer, or a light wave touch layer. In some embodiments, the touch layer 209 may be formed by a touch grid pattern including a conductive material, for example, the conductive material may be metal, metal oxide, graphene, or the like.

In some embodiments, the touch layer may be built-in with integrated ultra-thin glass. Compare in built-in integrated PET's touch-control layer, the integrated touch-control layer that has ultra-thin glass can have better anti falling ball ability, possesses better straining force simultaneously to be damaged when avoiding buckling.

In some embodiments, the touch layer may be an over-hanging touch layer. In some embodiments, the outer-hanging touch layer may be further disposed on the light-emitting side of the display panel 205 shown in fig. 4, the backlight side of the ultra-thin glass 2031 (not shown). By placing the outer-hanging touch layer on the backlight side of the ultra-thin glass 2031, the protection of the outer-hanging touch layer can be enhanced by the anti-falling ball performance characteristics of the ultra-thin glass. In some embodiments, the hanging touch layer can be disposed on the light-emitting side (not shown) of the ultra-thin glass 2031 shown in fig. 4. For example, the out-hung touch layer can be placed on the light-emitting side of the ultra-thin glass 2031 and the backlight side of the polarizer 204. The outer-hanging touch layer can be placed on the backlight side of the polarizer 204, so that ambient light irradiated to the outer-hanging touch layer can be reflected and cut off, and user experience is improved.

In some embodiments, the over-hanging touch layer may also be located on the light-emitting side of the polarizer 204 and the backlight side of the cover 2011.

In some embodiments, the display module 10 may further include an ultra-thin glass 2032, wherein the ultra-thin glass 2032 and the backlight side of the display panel 205 may be adhered by a sixth adhesive layer a6 (e.g., a foldable optically transparent adhesive). The description of the sixth adhesive layer a6 may refer to the description of the third adhesive layer A3, which will not be repeated herein. In addition, when the display module is bent, the display panel 205 and the ultra-thin glass layer 2032 are dislocated and moved, and the sixth adhesive layer a6 can also avoid damage to the display panel 205 due to excessive slippage.

Through directly arranging ultra-thin glass 2031, ultra-thin glass 2032 in display panel's upper and lower both sides, ultra-thin glass can play fine supporting role to display panel, effectively avoids the display module assembly to buckle the problem of arching of buckling that the interior organic polymer material plastic deformation of display panel caused.

The ultrathin glass is bonded with the display panel through the foldable optical transparent adhesive tape, so that the damage to the display panel caused by the overlarge slippage between the ultrathin glass and the display panel during bending can be avoided, and the display panel is protected.

The layer 207 is a back film to support the flexible display panel 205. In some embodiments, the material of the back film 207 may include any one of PI (Polyimide), PET (Polyethylene Terephthalate), TAC (Triacetyl Cellulose), and polymer film materials. In some embodiments, the material of the backing film 207 may be other flexible materials.

In some embodiments, the back film may be LCP (Liquid Crystal Polymer).

Because LCP has better mechanical strength than PI membrane, consequently support display panel that can be better alleviates the hunch-up problem that folding display module assembly buckled the production many times.

In some embodiments, the back film 207 is attached to the ultra-thin glass 2032 by a fifth adhesive layer a5 (e.g., an optically clear adhesive).

Layer 208 is a support structure that may include both hollowed-out and un-hollowed-out areas, as shown in fig. 6. It should be understood that in some embodiments, the openwork structure may also be referred to as a bamboo book structure. In some embodiments, the layer 208 may be a metal structure (e.g., the layer 208 includes metal hollowed-out regions and metal un-hollowed-out regions). It should be understood that, in some embodiments, the pattern of the hollow-out area may also be other patterns (for example, the hollow-out pattern may be one or more combinations of shapes such as rectangle, triangle, and circle), and the embodiment of the present application does not specifically limit the pattern of the hollow-out area. Optionally, the thickness of layer 208 is 50um-200um.

Adopt hollow out construction in the district of buckling, adopt non-hollow out construction to support display module assembly in non-bending area, when satisfying the characteristic that can buckle, can provide good holding power for display module assembly, reduce the degree of buckling and hunching, increase the roughness that display module assembly expandes after folding.

In some embodiments, the back-lit side of the openwork structure of layer 208 may place a conformal antenna, which may be comprised of conductive traces sprayed on a flexible circuit board. Alternatively, the form of the antenna may include one or more directional or omnidirectional antennas, for example, the antenna may include a dipole antenna, a monopole antenna, a patch antenna, a loop antenna, a slot antenna or other type of antenna suitable for radio frequency signal transmission. Optionally, the substrate of the flexible circuit board is LCP (Liquid Crystal Polymer).

The metal hollow structure can be used as a metal cavity, and the gain of radiation of the conformal antenna can be improved.

Through adopting LCP as the substrate of flexible circuit board, because LCP's loss tangent value is less than the used PI membrane of conventional flexible circuit board, consequently can reduce the loss of antenna radiation, simultaneously because LCP has good mechanical strength, high temperature resistant, can guarantee to avoid buckling and damage the antenna, reduces the life-span of antenna.

In some embodiments, the non-inflection regions may house transparent antennas. Optionally, the transparent antenna may be a conductive film antenna. It should be understood that the transparent antenna may be placed on the light-emitting side of the touch layer. Optionally, the ground terminal of the transparent antenna may be a metal housing or a metal supporting structure 208 of the display module.

The backing film 207 and the support structure 208 may be adhered by a sixth adhesive layer a6 (e.g., optically clear adhesive, pressure sensitive adhesive, etc.).

In some embodiments, a buffer zone (not shown) may also be included between the backing film 207 and the support structure 208, wherein the buffer zone is configured to absorb shock and cushion. Wherein the material of the buffer zone can be foam and/or copper foil. In some embodiments, the buffer material may include graphite to improve the heat dissipation of the display module. In some embodiments, a support member may be further included between the backing film 207 and the support structure 208, wherein the support member may be at least one of sus (steel Use stainless) steel sheet (e.g., 30um thick), copper sheet, or aluminum sheet. In some embodiments, the support member may also be an alloy material. The supporting component has higher elastic modulus, can play a supporting role, and reduces the crease problem caused by bending.

In some embodiments, including a metal support assembly between the backing film 207 and the support structure 208, the sixth adhesive layer a6 may be an epoxy adhesive or a hot melt adhesive film. Because metal bearing structure 208 is metal construction with metal support component (for example, the SUS steel sheet), consequently the sixth pastes the layer and adopts epoxy glue or hot melt adhesive membrane, can paste more firmly, can avoid collapsible fifth to paste the cross striation problem that the layer leads to in metal fretwork district simultaneously, makes display module group keep leveling.

In some embodiments, for better heat dissipation. A heat dissipation layer (not shown) may be further included between the back film 207 and the support structure 208, wherein the heat dissipation layer is adhered to the back film 207 through any one of the first adhesive layer a1, the second adhesive layer a2, the third adhesive layer A3, the fourth adhesive layer, the fifth adhesive layer, and the sixth adhesive layer. In some embodiments, the heat spreading layer material may be graphene. In some embodiments, to protect the heat sink material, a protective layer may be placed under the heat sink layer, wherein the material of the protective layer may be PET.

In another embodiment of the present application, as shown in FIG. 7, an ultra-thin glass 2031 can be placed on the light exit side of the polarizer 204 and an ultra-thin glass 2032 can be placed on the backlight side of the backsheet 207. Unlike the embodiment described in FIG. 4, the ultra-thin glass 2031 is interchanged with the polarizer 204 and the ultra-thin glass 2032 is interchanged with the backsheet 207. The contents of the embodiment of fig. 4 may be referred to with respect to the contents of other layers (including materials, locations, beneficial effects, etc.), and will not be described herein again.

The anti-falling ball performance of the screen module can be enhanced by placing the ultrathin glass on the light-emitting side of the polaroid.

Through placing ultra-thin glass in the side of being shaded of notacoria, ultra-thin glass supports display panel simultaneously with the notacoria, can more effectually provide holding power for display panel, alleviates collapsible display module assembly because the bending and arching problem that fold many times caused.

Below the ultra-thin glass 2032 is a support structure 208. The description of the support structure 208 may refer to the embodiment of fig. 4 in relation thereto.

The ultra-thin glass 2032 is attached to the support structure 208 by a sixth layer of adhesive (e.g., optically clear adhesive). The description of the sixth adhesive layer can refer to the related contents of the embodiment of fig. 4.

In some embodiments, a buffer zone may be further included between the ultra-thin glass 2032 and the support structure 208, and an SUS steel sheet (not shown) may be further included between the ultra-thin glass 2032 and the metal support structure 208, wherein the SUS steel sheet has a higher elastic modulus and may serve to reduce the problem of folding caused by bending.

Optionally, in some embodiments, for better heat dissipation. A heat dissipation layer may be further included between the ultra-thin glass 2032 and the support structure 208, wherein the heat dissipation layer is attached to the back film by an optically transparent adhesive, and a material of the heat dissipation layer may be graphene. In order to protect the heat sink material, a protective layer may be placed under the heat sink layer, wherein the material of the protective layer may be PET.

Through the experiment, the flat angle that flattens after the static bending of display module assembly that does not use ultra-thin glass is 70, through using first ultra-thin glass in the display panel top, uses second ultra-thin glass in the display panel below, flat angle 100 after static bending.

Further, in the above embodiments, an adhesive layer (e.g., a foldable optically clear adhesive) with a specific refractive index may be selected. Because collapsible display module assembly adopts organic polymer membrane material in a large number, for example CPI, wherein CPI's refracting index is 1.6, and the refracting index of pasting the layer at present is mostly 1.47, and it is not good with other organic polymer membrane material refracting index matching, leads to the reflectivity increase at each interface of display module assembly stromatolite, and the transmissivity degree reduces, and display module assembly's luminous efficacy receives very big influence. Optionally, select for use the adhesive layer that the refracting index is 1.5, can improve display module's optical transmittance by a wide margin, reduce display module's optical reflectivity. Optionally, the refractive index of the adhesive layer ranges from 1.5 to 1.8. In some embodiments, the refractive index of each adhesive layer may be different for the adhesive layers of the above embodiments.

Further, in the above embodiment, the thickness of the adhesive layer (e.g., the foldable optically transparent adhesive) may be increased (e.g., not less than 15 um). Increase the thickness on pasting the layer can reduce shear stress value to the collapsible performance of buckling of reinforcing display module assembly avoids display module assembly to damage when folding. Optionally, the thickness of the adhesive layer is 15um-45 um. In some embodiments, the adhesive layer may have a thickness of 75um,100um,125um, or 150 um.

Adopt thickness to be 15um-45 um's the layer of pasting, can be in the folding bending performance of reinforcing display module assembly, can not show the thickness that increases display module assembly, keep good user experience.

Adopt thickness to be 75um,100um,125um, or 150um paste the layer, can be in reinforcing display module assembly's the folding bending performance, can not show the thickness that increases display module assembly, keep good user experience.

In some embodiments, the adhesive layer (e.g., a foldable optically clear adhesive) has a thickness that is different in the inflection regions than in the non-inflection regions. Optionally, the thickness of the adhesive layer in the bending region is greater than the thickness of the adhesive layer in the non-bending region. Optionally, the thickness of the adhesive layer is gradually changed in the bending area and the non-bending area, for example, the closer to the bending area, the greater the thickness of the adhesive layer is. Optionally, the thickness of the adhesive layer changes stepwise from the bending region to the non-bending region.

Further, in the above embodiments, an adhesive layer having a low elastic modulus (e.g., a foldable optically clear adhesive) may be used. The layer of pasting of low elastic modulus possess lower shear stress value, can strengthen display module assembly's collapsible performance of buckling, avoid display module assembly to be damaged when folding.

In some embodiments, the adhesive layer can have a modulus of elasticity between 15Kpa and 100Kpa.

Preferably, the elastic modulus of the adhesive layer is 30Kpa, 45Kpa or 50 Kpa.

Further, in the above embodiments, the display panel and the adhesive layers on the upper and lower sides thereof exhibit a stacked structure, and the elastic modulus of the adhesive layer on one side (for example, the backlight side) of the display panel is different from the elastic modulus of the adhesive layer on the other side (for example, the light exit side) of the display panel. In some embodiments, the difference between the elastic modulus of the adhesive layer on one side of the display panel (e.g., the backlight side) and the elastic modulus of the adhesive layer on the other side of the display panel (e.g., the light exit side) is less than 10 Kpa.

Adopt the layer of pasting that has different elastic modulus in display panel's both sides, can be in the collapsible performance of buckling of reinforcing display module assembly, also can provide the display module assembly simultaneously and buckle the back and resume level and smooth required holding power.

In some embodiments, adhesive layers having different moduli of elasticity in the inflection regions and in the non-inflection regions may be used. Optionally, the adhesive layer has a lower modulus of elasticity in the inflection zones than in the non-inflection zones.

In some embodiments, an adhesive layer having a graded modulus of elasticity may be used (e.g., the adhesive layer has a lower modulus of elasticity closer to the fold region, or the adhesive layer has a graded modulus of elasticity in the thickness direction). Optionally, the adhesive layer has a lower modulus of elasticity in the inflection zones than in the non-inflection zones.

It should be understood that the adhesive layer described in the embodiments of the present application may be a foldable optically clear adhesive.

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

Claims

1. A foldable display device, characterized in that the foldable display device comprises:

a display panel;

first and second ultra-thin glasses stacked on both sides of the display panel;

the first pasting layer is positioned between the display panel and the first ultrathin glass;

the second adhesive layer is positioned between the display panel and the second ultrathin glass;

wherein a stacked structure composed of the first ultra-thin glass, the first adhesive layer, the display panel, the second adhesive layer, and the second ultra-thin glass is divided into a first region, a second region, and a folding region, wherein the folding region is located between the first region and the second region, and the first region and the display region are folded in half or unfolded along the folding region;

wherein the first adhesive layer and the second adhesive layer have an elastic modulus ranging from 15Kpa to 100Kpa.

2. The foldable display device of claim 1, wherein the first adhesive layer and the second adhesive layer have a thickness ranging from 15um to 45 um.

3. The foldable display device of claim 1 or 2, wherein the first adhesive layer has a different modulus of elasticity than the second adhesive layer.

4. The collapsible display device of claim 3, further comprising: a third adhesive layer and a back film stacked on the same side of the display panel;

wherein the third adhesive layer and the back film are both positioned between the display panel and the first ultra-thin glass;

wherein the third adhesive layer is positioned between the back film and the first ultra-thin glass.

5. The collapsible display device of claim 4, further comprising:

a fourth adhesive layer and a polarizer stacked on the same side of the display panel;

and the fourth adhesive layer and the polarizer are positioned between the display panel and the second ultrathin glass, and the fourth adhesive layer is positioned between the polarizer and the second ultrathin glass.

6. The foldable display device of claim 4 or 5, further comprising:

the touch layer and the fifth pasting layer are stacked on the same side of the display panel;

wherein the touch layer and a fifth adhesive layer are positioned between the second ultra-thin glass and the polarizer;

the fifth pasting layer is located between the second ultrathin glass and the touch layer.

7. The foldable display device of claim 4 or 5, wherein the display panel comprises: the organic light emitting diode comprises an encapsulation layer, an organic light emitting device layer and a touch layer, wherein the encapsulation layer, the organic light emitting device layer and the touch layer form a stacked structure.

8. The foldable display device of claim 6 or 7, wherein the touch layer comprises a third ultra-thin glass.

9. The foldable display device of claim 8, wherein the refractive indices of the first, second, third, fourth, and fifth adhesive layers are in the range of 1.5-1.8.

10. The foldable display device of claim 9, wherein the polarizer is a coated polarizer, or the first, second, third, fourth, and fifth adhesive layers are foldable optically clear adhesive.

11. The foldable display device of claim 10, the polarizer being a circular polarizer.

12. A foldable electronic device, characterized in that it comprises a foldable display device according to any of claims 1-11.