WO2020257985A1

WO2020257985A1 - Flexible display device and flexible display module

Info

Publication number: WO2020257985A1
Application number: PCT/CN2019/092580
Authority: WO
Inventors: 陈松亚
Original assignee: 深圳市柔宇科技有限公司
Priority date: 2019-06-24
Filing date: 2019-06-24
Publication date: 2020-12-30
Also published as: CN113330575A

Abstract

A flexible display device and a flexible display module. The flexible display device comprises the flexible display module (10), a display module temperature sensor (41), an electro-heating element (50), and a control module. The electro-heating element (50) and the display module temperature sensor (41) are separately connected to the control module; when the temperature of the flexible display module (10) detected by the display module temperature sensor (41) reaches a preset condition, the control module controls the electro-heating element (50) to heat the flexible display module (10). The flexible display module (10) comprises the electro-heating element (50). The flexible display device and the flexible display module (10) have good curling and bending characteristics in a low-temperature environment.

Description

Flexible display equipment and flexible display module

Technical field

This application relates to the field of display technology, and in particular to a flexible display device and a flexible display module.

Background technique

At present, flexible OLED (Organic light-emitting diode, organic light-emitting diode) display modules and other types of bendable display modules are used in a variety of new bendable display types due to their own bendable characteristics. In consumer electronics products, however, since flexible OLED display modules are physical laminates formed by bonding multiple laminates through optical glue, when it is placed in an environment below zero or lower, the optical glue and The elastic modulus, resilience, and creep properties of the multi-layer laminate will drop sharply, and the bending resistance of the flexible OLED display module will also decrease, which deteriorates the mechanical relationship of the flexible display device and is not suitable for flexible deformation. If the flexible display device is directly bent or curled in a low temperature environment, it is very easy to cause serious consequences such as separation or damage of the multiple layers of the flexible display module, which will seriously affect the user experience of the product in winter and low temperature areas.

Summary of the invention

The first objective of the present application includes providing a flexible display device, which is provided with an electric heating element for heating the flexible display module, and has good curling and bendability characteristics in a low temperature environment.

The second objective of the present application includes providing a flexible display module, including an electro-heating element, which has better curling and bendable characteristics in a low temperature environment.

In order to achieve the above objectives, this application first provides a flexible display device, including: a flexible display module, a display module temperature sensor, an electrothermal element, and a control module, the electrothermal element and the display module temperature sensor Are respectively connected to the control module; the control module controls the electrothermal element to control the flexible display module when the temperature of the flexible display module detected by the display module temperature sensor reaches a preset condition Heat up.

In some embodiments of the application, the electric heating element is a graphene film and/or a graphite film.

In some embodiments of the present application, the electric heating element is provided on the inner and/or outer surface of the flexible display module.

In some embodiments of the present application, a display module temperature sensor is provided in the flexible display device, and the electro-heating element is an integral, continuously extending film.

In some embodiments of the present application, the electric heating element includes a plurality of electric heating units arranged at intervals.

In some embodiments of the present application, a display module temperature sensor is provided in the flexible display module area corresponding to each electrothermal unit, and the temperature monitored by each display module temperature sensor is used as its corresponding electrothermal unit The temperature of the corresponding flexible display module area.

In some embodiments of the present application, the flexible display device is provided with a bendable area and a non-bendable area, and the number of the bendable area may be one or more.

In some embodiments of the present application, the flexible display device further includes a middle frame and a bottom cover provided in the non-bending area, and the middle frame includes a supporting plate for supporting the flexible display module and The side plate connected with the support plate, the bottom cover is connected with the side plate, the middle frame and the bottom cover enclose an accommodating space, and the accommodating space is provided with electronic components.

In some embodiments of the present application, the display module temperature sensor is provided between the flexible display module and the support plate of the middle frame.

In some embodiments of the present application, a thermally conductive material for conducting the heat generated by the electronic component to the middle frame is provided between the electronic component and the middle frame.

Optionally, the thermal conductive material includes one or more of a silica gel thermal pad and a thermal paste.

In some embodiments of the present application, the bottom of the flexible display module is provided with a uniform temperature and thermal conductivity film.

Optionally, the uniform temperature and thermal conductivity film is a graphite film or a graphene film.

In some embodiments of the present application, the flexible display module includes a plurality of structural layers stacked; the electro-heating element is arranged between any two structural layers of the plurality of structural layers, or is arranged The outer surface of the outermost structural layer among the plurality of structural layers.

In some embodiments of the present application, the multiple structural layers include a bottom support film, a light-emitting device layer, a polarizer, a touch module layer, and an upper cover that are sequentially stacked; the electro-heating element is attached to the On the surface of the structure layer, the attachment position of the electrothermal element is selected from: the surface of the upper cover facing the touch module layer, and the touch module layer facing the upper cover The surface of the touch module layer, the surface of the touch module layer facing the polarizer, the surface of the polarizer away from the light emitting device layer, and the surface of the bottom support film away from the light emitting device layer One or more of.

Optionally, the upper cover and the touch module layer, the touch module layer and the polarizer, the light-emitting device layer and the bottom support film all pass through a first adhesive layer In connection, the first adhesive layer is a transparent optical adhesive.

In some embodiments of the present application, the flexible display module further includes a uniform temperature and thermal conductivity film, and the uniform temperature and thermal conductivity film is bonded to the bottom support film by a second adhesive layer, which is far from the light-emitting device layer. The surface of the side.

In some embodiments of the present application, the light-emitting device layer is an OLED light-emitting device layer, the material of the upper cover plate is colored polyimide or colorless polyimide, and the material of the bottom support film is polyimide. Ethylene terephthalate or polyimide, the polarizer is a circular polarizer.

In some embodiments of the present application, the control module includes a processor and a control circuit, the control circuit and the display module temperature sensor are respectively connected to the processor, and the electrothermal element and the control circuit Circuit connection.

In some embodiments of the present application, the control circuit is located in the driver IC of the flexible display module, the electro-heating element is connected to the driver IC through a wire, and the driver IC is connected to the processor.

Optionally, the material of the wire is nano silver wire.

The present application also provides a flexible display module, the flexible display module includes an electrothermal element; the flexible display module includes a plurality of structural layers stacked; the electrothermal element is provided in the plurality of Between any two structural layers in the structural layer, or arranged on the outer surface of the outermost structural layer among the plurality of structural layers.

The beneficial effects of this application:

The flexible display device of the present application is provided with an electro-heating element for heating the flexible display module inside, which can meet the user's requirements for folding or curling the flexible display device under low temperature conditions, and improve the flexible display device’s low temperature The service life in the environment and the reliability of the whole machine make the flexible display device have a better multi-scene user experience.

The flexible display module of the present application includes an electric heating element, which self-heats after being energized, which can ensure that the flexible display module has good curling and bendability characteristics in a low temperature environment.

Description of the drawings

In order to more clearly describe the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings that need to be used in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore do not It should be regarded as a limitation of the scope of this application.

FIG. 1 is a schematic cross-sectional structure diagram of an embodiment of the flexible display device of this application;

FIG. 2 is an enlarged schematic diagram of a partial area of the flexible display device of FIG. 1;

FIG. 3 is a schematic structural diagram of an embodiment of the flexible display device of this application in a bent state;

4A, 4B, 4C, and 4D respectively show the distribution of electro-heating elements and temperature sensors of the display module in multiple embodiments of the flexible display device of the present application;

5 is a schematic diagram of the distribution positions of ambient temperature sensors in an embodiment of the flexible display device of this application;

6A, FIG. 6B, FIG. 6C, FIG. 6D, and FIG. 6E are respectively schematic cross-sectional structural diagrams of multiple embodiments of the flexible display module in the flexible display device of this application;

FIG. 7 is a schematic plan view of an embodiment of a flexible display module in the flexible display device of this application.

Symbol description of main components:

10. Flexible display module; 41. Display module temperature sensor; 50. Electro-heating element; 51. Electro-heating unit; 21. Bendable area; 215. Hinge; 22. Non-bending area; 30. Middle Frame; 31, support plate; 32, side plate; 61, bottom cover; 62, electronic components; 621, battery; 622, heat insulation layer; 623, PCB board; 624, processor; 625, shielding cover; 626, integral Main control chip of the machine; 63, thermal conductive material; 16, uniform temperature thermal conductive film; 42, ambient temperature sensor; 11, bottom support film; 12, light emitting device layer; 13, polarizer; 14, touch module layer; 15. Upper cover plate; 71, first adhesive layer; 72, second adhesive layer; 80, drive IC.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work shall fall within the protection scope of the present application.

1-7, the present application provides a flexible display device, including: a flexible display module 10, a display module temperature sensor 41, an electrothermal element 50, and a control module. The electrothermal element 50 and the control module The display module temperature sensor 41 is respectively connected to the control module; the control module controls the electro-actuator when the temperature of the flexible display module 10 detected by the display module temperature sensor 41 reaches a preset condition The heating element 50 heats the flexible display module 10.

In some embodiments of the present application, the display module temperature sensor 41 is provided on the outer surface or inside of the flexible display module 10.

In some embodiments of the present application, the electric heating element 50 is provided on the inner and/or outer surface of the flexible display module 10.

In some embodiments of the present application, the preset condition refers to that the temperature of the flexible display module 10 is lower than a preset safe temperature value.

In some embodiments of the present application, the control module includes a processor 624 and a control circuit. The control circuit and the display module temperature sensor 41 are respectively connected to the processor 624, and the electrothermal element 50 Connect with the control circuit. When the display module temperature sensor 41 monitors that the temperature of the flexible display module 10 is lower than the preset safe temperature value, the processor 624 outputs a heating instruction to the control circuit, and the control circuit controls the electromotive force. The heating element 50 is energized, and the electric heating element 50 generates heat after being energized to heat the flexible display module 10 and ensure that the temperature of the flexible display module 10 is at least about a preset safe temperature value.

It is understandable that the control circuit can not only control whether the electrothermal element 50 is energized or not, but also control the magnitude of the current or voltage applied to the electrothermal element 50, that is to say, The control circuit can not only control whether the electric heating element 50 generates heat, but also control the heating efficiency of the electric heating element 50.

It is understandable that the preset safe temperature value refers to the lowest temperature value that can ensure that the optical glue in the flexible display module 10 and other materials with reduced bending resistance when cold are kept relatively flexible. The safe temperature value is set according to the material characteristics of the flexible display module 10, and the preset safe temperature value will also be different for flexible display modules 10 of different structures and/or different materials.

In some embodiments of the present application, the preset safe temperature value is 0°C to -5°C, for example, 0°C, -1°C, -2°C, -3°C, -4°C, -5°C.

Since the flexible display device of the present application can start the self-heating program in a low temperature environment, to ensure that the temperature of the flexible display module 10 is maintained at least about the preset safe temperature value, the flexible display device of the present application can be maintained in any temperature environment Good bending and bending resistance characteristics.

Since the flexible display module 10 is formed by laminating multiple laminates, and the bending characteristics of different materials in the multiple laminates will be different, when the flexible display module 10 maintains the bendability guaranteed by the overall design at room temperature When it is placed in a low-temperature environment, its flexural properties will become unstable, and the lower the temperature, the greater the brittleness of the material, and the sharp decline in flexural resistance. This application quickly improves the flexibility at low temperatures. The overall temperature of the display module 10 is within a safe temperature range, so that the flexible display module 10 can maintain good bending resistance in a low temperature environment, and ensure that the flexible display module 10 can be bent and used normally in a low temperature environment.

Preferably, the electro-heating element 50 is a graphene film. The graphene film has the characteristics of transparency, conductivity, and heat generation when energized, and also has good toughness and can be bent. In this application, the graphene film is used to heat the flexible display module 10 in a low temperature environment, so that the flexible display module 10 also has better bending resistance characteristics in a low temperature environment. In addition, the graphene film The light transmittance is high (above 90%), so even if it is installed on the light-emitting side, it will not affect the screen display. In addition, the graphene film itself has good bending resistance characteristics, which can ensure that the flexible display device has better durability. Bending characteristics.

In some embodiments of the present application, in order to ensure that the flexible display device has a relatively thin thickness, the display module temperature sensor 41 is preferably a thin-film temperature sensor.

Optionally, as shown in FIG. 4A, a display module temperature sensor 41 is provided in the flexible display device, and the electro-heating element 50 is an integral, continuously extending film.

Optionally, as shown in FIGS. 4B to 4D, the flexible display device is provided with a plurality of display module temperature sensors 41, and the plurality of display module temperature sensors 41 are distributed on the flexible display module 10 Multiple areas, so that multiple areas of the flexible display module 10 can be independently monitored.

Optionally, as shown in FIGS. 4B to 4D, the electrothermal element 50 includes a plurality of electrothermal units 51 arranged at intervals, and the plurality of electrothermal units 51 are distributed on the flexible display module 10 The plurality of electro-heating units 51 are all connected to the processor 624. Optionally, the power-on of the plurality of electro-heating units 51 is independently controlled by the processor 624. .

In view of the situation in which the electrothermal element 50 includes a plurality of electrothermal units 51 arranged at intervals, the technical solution of the present application provides at least the following embodiments:

Embodiment 1: As shown in FIG. 4B, a display module temperature sensor 41 is provided in the area of the flexible display module 10 corresponding to each electrothermal unit 51, and the temperature monitored by each display module temperature sensor 41 is used as its corresponding The temperature of the flexible display module area 10 corresponding to the electro-heating unit 51. When the temperature monitored by the display module temperature sensor 41 is lower than the preset safe temperature value, the processor 624 outputs a heating instruction to the control circuit, and the control circuit controls the electro-induced electromotive force corresponding to the display module temperature sensor 41. The heating unit 51 is energized to generate heat, and the heat of the electro-heating unit 51 is used to heat the flexible display module 10.

Embodiment 2: As shown in FIG. 4C, a plurality of display module temperature sensors 41 are provided in the area of the flexible display module 10 corresponding to each electrothermal unit 51. The average value of the temperature is used as the temperature of the area of the flexible display module 10 corresponding to the electrothermal unit 51 corresponding to the plurality of display module temperature sensors 41. When the average value of the temperature monitored by the plurality of display module temperature sensors 41 is lower than the preset safe temperature value, the processor 624 outputs a heating instruction to the control circuit, and the control circuit controls the plurality of temperature transmissions. The electric heating unit 51 corresponding to the sensor is energized to generate heat, and the heat of the electric heating unit 51 is used to heat the flexible display module 10.

Embodiment 3: As shown in FIG. 4D, a display module temperature sensor 41 is provided in the flexible display module 10 area corresponding to several (two or more) electrothermal units 51, and the display module temperature sensor 41 detects The temperature of is taken as the temperature of the flexible display module 10 area corresponding to the several electro-heating units 51. When the temperature monitored by the display module temperature sensor 41 is lower than the preset safe temperature value, the processor 624 outputs a heating instruction to the control circuit, and the control circuit controls the temperature sensor 41 corresponding to the display module. Each electric heating unit 51 is energized to generate heat, and the heat of the electric heating unit 51 is used to heat the flexible display module 10.

As shown in FIG. 1, in some embodiments of the present application, the flexible display device is provided with a bendable area 21 and a non-bendable area 22. At this time, the flexible display device is a flexible foldable display device. It is understandable that the flexible display device can be bent in the bendable area 21 but cannot be bent in the non-bendable area 22. In a flexible display device, the number of the bendable regions 21 may be one or more (ie, two or more), so the number of the non-bendable regions 22 is two or more.

As shown in FIG. 1, in some embodiments of the present application, the flexible display device further includes a middle frame 30 and a bottom cover 61 disposed in the non-bending area 22, and the middle frame 30 includes The support plate 31 of the flexible display module 10 and the side plate 32 connected to the support plate 31, the bottom cover 61 is connected to the side plate 32, and the middle frame 30 and the bottom cover 61 enclose a container An electronic component 62 is provided in the accommodating space. The electronic component 62 includes a battery 621, a PCB board 623, and a chipset connected to the PCB board 623 (for example, the processor 624, the main control chip 626 of the whole machine), etc. .

In some embodiments of the present application, the display module temperature sensor 41 is provided between the flexible display module 10 and the support plate 31 of the middle frame 30, and is used to control the temperature of the flexible display module 10 The temperature is checked.

As shown in FIG. 1, in some embodiments of the present application, the processor 624 is covered with a shielding cover 625 made of metal material, and a thermally conductive material is provided between the processor 624 and the shielding cover 625. 63. Therefore, the shielding cover 625 can not only shield signal interference, but also achieve heat conduction.

As shown in FIG. 1, when the battery 621 is adjacent to the PCB board 623, the surface of the battery 621 is provided with a heat insulation layer 622 to prevent the heat of the PCB board 623 from affecting the safety of the battery 621. Optionally, the heat insulation layer 622 is heat insulation paper.

As shown in FIG. 1, in some embodiments of the present application, a thermally conductive material 63 is provided between the electronic component 62 and the middle frame 30 to conduct the heat generated by the electronic component 62 to the middle frame. The thermally conductive material 63 is, for example, a silica gel thermal pad or thermal paste. By providing a thermally conductive material 63 between the electronic component 62 and the middle frame 30, the heat generated by the electronic component 62 during operation can be transferred to the middle frame 30 through the thermally conductive material 63, and then through the middle frame. 30 is transferred to the flexible display module 10, which is beneficial to realize the heat dissipation of the electronic component 62, thereby ensuring the normal operation of the electronic component 62 and extending its service life. When the flexible display device is in a low temperature environment, the electronic component 62 The heat generated and transferred to the flexible display module 10 is also beneficial to increase the temperature of the flexible display module 10, and has a synergistic effect with the electro-heating element 50, thereby reducing the number of electro-heating elements. 50 The electric energy required for heating, reduce the energy consumption of the whole machine, and extend the use time of the flexible display device.

Specifically, the materials of the middle frame 30 and the bottom cover 61 are, for example, glass, metal, plastic, etc. In some embodiments of the present application, the heat generated by the electronic component 62 can be quickly transferred to the flexible display In the module 10, preferably, the material of the middle frame 30 is a material with high thermal conductivity such as metal.

Specifically, the middle frame 30 and the bottom cover 61 may be connected in any manner, such as one or more of bolt connection, snap connection, glue bonding, and the like.

As shown in FIGS. 6A to 6E, in some embodiments of the present application, the bottom of the flexible display module 10 is provided with a uniform temperature and thermal conductivity film 16, which can enable transmission from the electronic component 62 The incoming heat is evenly dispersed, so that different areas of the flexible display module 10 are evenly heated.

Optionally, the uniform temperature and thermal conductivity film 16 is a graphite film or a graphene film or the like.

Optionally, as shown in FIG. 1, the bendable area 21 is provided with hinges 215, and the hinges 215 are connected to the middle frames 30 located on both sides of the hinges. The functions of the hinges 215 include: The middle frame 30 is connected to support the flexible display module 10 located above it. At the same time, the hinge 215 itself has the property of bending resistance and can realize the bending function of the bendable area 21.

As shown in FIG. 5, in some embodiments of the present application, an ambient temperature sensor 42 is provided between the flexible display module 10 and the side plate 32 of the middle frame 30, and the ambient temperature sensor 42 is used to sense the temperature of the external environment where the flexible display device is located. The environmental temperature can be displayed on the display surface of the flexible display module 10, so that the user can know the temperature of the environment in time.

As shown in FIGS. 6A to 6E, in some embodiments of the present application, the flexible display module 10 includes a plurality of structural layers stacked; the electrothermal element 50 is disposed in the plurality of structural layers Between any two structural layers of the above, or on the outer surface of the outermost structural layer among the plurality of structural layers.

It is understandable that the number of the electro-heating elements 50 provided in the flexible display module 10 may be one or more. When the number of the electro-heating elements 50 is more than The electric heating element 50 may be arranged at the same position or at multiple different positions.

When the electrothermal element 50 is a graphene film, optionally, the graphene film is prepared on the surface of the structure layer of the flexible display module 10 by vacuum plating (such as vacuum evaporation) or chemical vapor deposition. . The vacuum plating refers to a method in which graphene powder is used as a raw material for film formation.

As shown in FIGS. 6A to 6E, in some embodiments of the present application, the multiple structural layers include a bottom support film 11, a light emitting device layer 12, a polarizer 13, a touch module layer 14, and The upper cover 15; the electro-heating element 50 is attached to the surface of the structure layer, and the attachment position of the electro-heating element 50 is selected from: the upper cover 15 faces the touch module layer 14 side The surface of the touch module layer 14 facing the side of the upper cover 15, the surface of the touch module layer 14 facing the side of the polarizer 13, and the polarizer 13 is away from the One or more of the surface on the side of the light emitting device layer 12 and the surface of the bottom support film 11 on the side away from the light emitting device layer 12. Preferably, the electro-heating element 50 is not provided on the outer surface of the light-emitting device layer 12 to prevent the light-emitting performance and service life of the light-emitting device layer 12 from being affected.

It is understandable that when the electrothermal element 50 is disposed between the light-emitting device layer 12 and the display surface of the flexible display module 10, the electrothermal element 50 needs to have a high light transmittance (90 % Or more), in this case, preferably, the electrothermal element 50 is a graphene film; when the electrothermal element 50 is disposed on the light-emitting device layer 12 and the flexible display module 10 When between non-display surfaces, the light transmittance of the electric heating element 50 is not limited. In this case, the electric heating element 50 may be a graphene film or be made of other electric heating materials. Thin film (e.g. graphite film).

As shown in FIGS. 6A to 6E, in some embodiments of the present application, the upper cover 15 and the touch module layer 14, the touch module layer 14 and the polarizer 13, the The light emitting device layer 12 and the bottom support film 11 are both connected by a first adhesive layer 71, and the first adhesive layer 71 is a transparent optical adhesive. The light transmittance of the transparent optical glue is greater than 90%.

As shown in FIGS. 6A to 6E, in some embodiments of the present application, the flexible display module 10 further includes a thermally uniform temperature film 16, which is bonded by a second adhesive layer 72 On the bottom surface of the supporting film 11 away from the light emitting device layer 12. Since the side where the thermally uniform temperature film 16 is located is the non-light emitting side, the second adhesive layer 72 has no limitation on the light transmittance, and it only needs to have better adhesive properties and bendable properties. The second adhesive layer 72 can be either a transparent optical adhesive or a common double-sided adhesive (for example, an ultra-thin and high-resilience double-sided adhesive).

In some embodiments of the present application, the light-emitting device layer 12 is an OLED light-emitting device layer, and further may be an AMOLED light-emitting device layer, and the material of the upper cover 15 is colored polyimide or colorless polyimide. Colorless Polyimide (CPI) and other materials, the bottom support film 11 is made of materials such as polyethylene terephthalate (PET, Polyethylene terephthalate) or polyimide (PI, Polyimide), and the polarized light The sheet 13 is a circular polarizer, which can reduce or eliminate the reflection of external ambient light in the flexible display module 10, thereby reducing the interference of external ambient light on the display screen and improving the display quality.

As shown in FIG. 7, in some embodiments of the present application, the control circuit is located in the driving IC 80 of the flexible display module 10, the electro-heating element 50 is connected to the driving IC 80 through a wire, and the The driver IC 80 is connected to the processor 624. Optionally, the material of the wire is nano silver wire, and the connection is realized by bonding.

Specifically, nano silver wire is a one-dimensional metal material with a maximum radial direction of 100 nm, no longitudinal limit, and an aspect ratio greater than 100 (up to ten thousand). Generally speaking, the aspect ratio of nano silver wire is Larger, the higher the light transmittance and the lower the resistance.

In some embodiments of the present application, the processor 624 is a central processing unit (CPU, Central Processing Unit) of the flexible display device.

The flexible display device of the present application is provided with an electric heating element 50 for heating the flexible display module 10 in its interior, which can meet the user's requirements for folding or curling the flexible display device under low temperature conditions, and improve flexibility. The service life of the display device in a low-temperature environment and the reliability of the whole machine enable the flexible display device to have a better multi-scenario user experience. At the same time, the flexible display device of this application can also monitor the temperature of the flexible display module 10 and Intelligently adjust the working mode of the electro-heating element 50, intelligent energy saving.

Please refer to FIGS. 6A to 6E. The present application also provides a flexible display module 10, which includes an electro-heating element 50.

The flexible display module 10 of the present application includes an electroheating element 50, which self-heats after being energized, which can ensure that the flexible display module 10 has good curling and bendability characteristics in a low temperature environment .

Based on the above-mentioned flexible display device, the present application also provides a method for controlling the above-mentioned flexible display device, which includes the following steps:

Step 1. The display module temperature sensor 41 collects the temperature of the flexible display module 10 in real time online or continuously at preset time intervals, and transmits the temperature to the processor 624;

Step 2. The processor 624 compares the temperature of the flexible display module 10 with a preset safe temperature value;

Step 3. When the processor 624 recognizes that the temperature of the flexible display module 10 is lower than the preset safe temperature value, the processor 624 outputs a heating instruction to the control circuit;

Step 4. The control circuit controls the electric heating element 50 to generate electricity and heat, thereby heating the flexible display module 10, and the display module temperature sensor 41 collects online in real time or continuously at preset time intervals The temperature of the flexible display module 10, and transmit the temperature to the processor 624;

Step 5. The processor 624 compares the temperature of the flexible display module 10 with a preset safe temperature value. When the processor 624 recognizes that the temperature of the flexible display module 10 is equal to or higher than the When the safe temperature value is preset, the processor 624 outputs a heating stop instruction to the control circuit, and the control circuit controls the electrothermal element 50 to power off.

It is understandable that the heating instruction may not only include an instruction whether to energize the electric heating element 50, but may also include an instruction for controlling the magnitude of the current or voltage applied by the electric heating element 50.

In some embodiments of the present application, in the steps 1 and 4, the preset time interval is 0.1-60s, such as 0.1s, 0.5s, 1s, 5s, 10s, 20s, 30s, 40s, 50s, 60s.

It is understandable that when the display module temperature sensor 41 continuously collects the temperature of the flexible display module 10 at a preset time interval, the preset time interval may be based on different temperature conditions of the flexible display module 10 For example, when the temperature of the flexible display module 10 is significantly different from the preset safe temperature value, the preset time interval may be set to a shorter time interval. When the flexible display module 10 When the difference between the temperature and the preset safe temperature value is large, the preset time interval can be set to a longer time interval.

As shown in FIG. 4A, in some embodiments of the present application, a display module temperature sensor 41 is provided in the flexible display device, and the electro-heating element 50 is an integral, continuously extending film; the display module The temperature sensor 41 transmits the monitored temperature to the processor 624. The processor 624 compares the temperature monitored by the temperature sensor 41 of the display module with a preset safe temperature value, and determines the specific temperature for the electricity according to the comparison result. The heating element 50 is caused to output a heating instruction, output a heating stop instruction, or output no instruction.

As shown in FIGS. 4B to 4D, in other embodiments of the present application, the electro-heating element 50 includes a plurality of electro-heating units 51 arranged at intervals.

As shown in FIG. 4B, when a display module temperature sensor 41 is provided in the area of the flexible display module 10 corresponding to each electrothermal unit 51, each display module temperature sensor 41 transmits its monitored temperature to the processing unit. The processor 624 compares the temperature monitored by the temperature sensor 41 of the display module with a preset safe temperature value, and determines the electrothermal unit 51 corresponding to the temperature sensor 41 of the display module according to the comparison result. Output heating instruction, output stop heating instruction, or output no instruction.

As shown in FIG. 4C, when a plurality of display module temperature sensors 41 are provided in the flexible display module 10 area corresponding to each electrothermal unit 51, the flexible display module 10 corresponding to each electrothermal unit 51 The temperature sensors 41 of the multiple display modules in the area respectively transmit the monitored temperatures to the processor 624. The processor 624 averages the multiple temperatures to obtain an average temperature value, and compares the average temperature value with a preset safety value. The temperature values are compared, and it is determined according to the comparison result to output a heating instruction, output a heating stop instruction, or not output any instruction for the electrothermal unit 51 corresponding to the plurality of display module temperature sensors 41.

As shown in FIG. 4D, when a display module temperature sensor 41 is set in the flexible display module 10 area corresponding to several (two or more) electrothermal units 51, the display module temperature sensor 41 monitors it The temperature of the display module is transmitted to the processor 624. The processor 624 compares the temperature monitored by the display module temperature sensor 41 with a preset safe temperature value, and determines the corresponding temperature sensor 41 for the display module according to the comparison result. The plurality of electrothermal units 51 output heating instructions, output stop heating instructions, or output no instructions.

The control method of the flexible display device of the present application monitors the temperature of the flexible display module 10 and intelligently adjusts the working mode of the electro-heating element 50 to ensure that the temperature of the flexible display module 10 is at least about the preset safe temperature value. This ensures that the flexible display device also has better curling and bendable characteristics in a low temperature environment, and improves the user experience of the flexible display device in a low temperature environment.

Since it is impossible for all the numerical ranges of the parameters involved in this application to be embodied in the above-mentioned embodiments, those skilled in the art can fully imagine that any value within the above-mentioned numerical ranges can be implemented in this application. Of course It also includes any combination of specific values within the numerical range of several items. Here, for the sake of space, embodiments that give specific values within one or more numerical ranges are omitted, and this should not be regarded as insufficient disclosure of the technical solution of the present application.

The above descriptions are only preferred examples of the application and are not intended to limit the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the application Within the scope of protection.

Claims

A flexible display device, which is characterized by comprising: a flexible display module, a display module temperature sensor, an electric heating element, and a control module. The electric heating element and the display module temperature sensor are respectively connected to the control module. Module connection; the control module controls the electro-heating element to heat the flexible display module when the temperature of the flexible display module detected by the display module temperature sensor reaches a preset condition.
5. The flexible display device of claim 1, wherein the electro-heating element is provided on the inner and/or outer surface of the flexible display module.
The flexible display device according to claim 1, wherein the electro-heating element is a graphene film and/or a graphite film.
5. The flexible display device according to claim 1, wherein a display module temperature sensor is provided in the flexible display device, and the electro-heating element is an integral, continuous film.
8. The flexible display device of claim 1, wherein the electrothermal element comprises a plurality of electrothermal units arranged at intervals.
The flexible display device of claim 5, wherein a display module temperature sensor is provided in the area where each electrothermal unit is located, and the temperature monitored by each display module temperature sensor is used as its corresponding electrothermal unit. The temperature of the flexible display module area corresponding to the heating unit.
The flexible display device of claim 1, wherein the flexible display device is provided with a bendable area and a non-bendable area, and the number of the bendable area is one or more.
The flexible display device of claim 7, wherein the flexible display device further comprises a middle frame and a bottom cover arranged in the non-bending area, and the middle frame comprises a frame for supporting the flexible display mold. The supporting plate of the group and the side plate connected with the supporting plate, the bottom cover is connected with the side plate, the middle frame and the bottom cover enclose an accommodating space, and the accommodating space is provided with electronics element.
8. The flexible display device according to claim 8, wherein the display module temperature sensor is provided between the flexible display module and the support plate of the middle frame.
8. The flexible display device according to claim 8, wherein a thermally conductive material is provided between the electronic component and the middle frame to conduct heat generated by the electronic component to the middle frame.
The flexible display device of claim 10, wherein the thermally conductive material comprises one or more of a silica gel thermal pad and a thermally conductive paste.
8. The flexible display device of claim 8, wherein the bottom of the flexible display module is provided with an even temperature and thermal conductivity film.
The flexible display device of claim 12, wherein the temperature-uniform thermal conductivity film is a graphite film or a graphene film.
5. The flexible display device of claim 2, wherein the flexible display module comprises a plurality of structural layers stacked; and the electro-heating element is provided in any two of the plurality of structural layers Between layers, or provided on the outer surface of the outermost structural layer among the plurality of structural layers.
The flexible display device according to claim 14, wherein the multiple structural layers comprise a bottom support film, a light emitting device layer, a polarizer, a touch module layer, and an upper cover that are stacked in sequence; The heating element is attached to the surface of the structure layer, and the attachment position of the electro heating element is selected from: the surface of the upper cover facing the touch module layer, and the touch module layer The surface on the side of the upper cover, the surface of the touch module layer facing the side of the polarizer, the surface on the side of the polarizer away from the light emitting device layer, and the bottom support film away from the light emitting device. One or more of the surfaces on one side of the device layer.
The flexible display device of claim 15, wherein the upper cover and the touch module layer, the touch module layer and the polarizer, the light-emitting device layer and the The bottom support films are all connected by a first adhesive layer, and the first adhesive layer is a transparent optical adhesive.
The flexible display device of claim 15, wherein the flexible display module further comprises a thermally uniform temperature film, and the thermally uniform temperature film is adhered to the bottom support film by a second adhesive layer. The surface on one side of the light-emitting device layer.
The flexible display device of claim 15, wherein the light emitting device layer is an OLED light emitting device layer, the material of the upper cover plate is colored polyimide or colorless polyimide, and the bottom The material of the supporting film is polyethylene terephthalate or polyimide, and the polarizer is a circular polarizer.
The flexible display device of claim 1, wherein the control module comprises a processor and a control circuit, the control circuit and the display module temperature sensor are respectively connected to the processor, and the electro-actuated The heating element is connected with the control circuit.
19. The flexible display device of claim 19, wherein the control circuit is located in a driver IC of the flexible display module, the electrothermal element is connected to the driver IC through a wire, and the driver IC Connect to the processor.
22. The flexible display device of claim 20, wherein the wire is made of nano silver wire.
A flexible display module, characterized in that, the flexible display module includes an electrothermal element; the flexible display module includes a plurality of structural layers stacked; the electrothermal element is provided in the plurality of Between any two structural layers in the structural layer, or provided on the outer surface of the outermost structural layer among the plurality of structural layers.