Flexible display panel, manufacturing method thereof, and flexible display device

Abstract

This invention provides a flexible display panel, comprising: a display area and a border area surrounding the display area. The border area includes an upper border area, a lower border area, and a side border area connecting the upper and lower border areas. The upper border area includes at least one pyroelectric sensing area, which is provided with: a flexible substrate; a thin-film encapsulation layer on the flexible substrate; and a pyroelectric sensor located on the side of the thin-film encapsulation layer away from the flexible substrate. The pyroelectric sensor generates electrical signals of different intensities upon receiving infrared radiation of different intensities. The flexible display panel provided by this invention does not require an opening in the sensing area to accommodate the sensor, enabling a full-screen display.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a flexible display panel, its manufacturing method, and a flexible display device. Background Technology

[0002] With the rise of flexible OLED (Organic Light-Emitting Diode) technology, full-screen technology and full-screen mobile phones have become one of the most popular technologies, and are loved and sought after by a wide range of users.

[0003] Full-screen technology is a broad definition used in the display industry for smartphones with ultra-high screen-to-body ratios. Literally, it means the entire front of the phone is a screen, completely covering the display interface, with all four bezels being borderless, aiming for a near 100% screen-to-body ratio. However, due to the need for other essential smartphone functions such as the front-facing camera, earpiece, proximity sensor, and light sensor, a notch is currently required at the top of the screen to accommodate these components. Therefore, the industry's claims of "full-screen phones" currently only refer to phones with ultra-high screen-to-body ratios; no phone has yet achieved a 100% screen-to-body ratio on the front, the so-called "notch screen" or "waterdrop screen." Even with ultra-narrow bezels, the actual screen-to-body ratio can reach around 80% to 90%, still some distance from a 100% full-screen design. Summary of the Invention

[0004] The embodiments of the present invention provide a flexible display panel and its manufacturing method, as well as a flexible display device, which can avoid making openings in the sensing area to accommodate sensors, thus solving the problem that the prior art cannot truly achieve a full-screen display.

[0005] A first aspect of the present invention provides a flexible display panel, comprising: a display area and a border area surrounding the display area, the border area including an upper border area, a lower border area, and a side border area connecting the upper border area and the lower border area, characterized in that the upper border area includes at least one pyroelectric sensing area, the pyroelectric sensing area being provided with:

[0006] Flexible substrate;

[0007] A thin-film encapsulation layer located on the flexible substrate;

[0008] A pyroelectric sensor located on the side of the thin-film encapsulation layer away from the flexible substrate is used to generate electrical signals of different intensities after receiving infrared radiation of different intensities.

[0009] Optionally, the pyroelectric sensor includes:

[0010] A first sensing electrode layer located on the side of the thin film encapsulation layer away from the flexible substrate, the first sensing electrode layer including at least one first sensing electrode;

[0011] A pyroelectric thin film located on the side of the first sensing electrode layer away from the flexible substrate, the pyroelectric thin film being used to release charge when a temperature change is caused by infrared radiation;

[0012] A second sensing electrode layer located on the side of the pyroelectric thin film away from the flexible substrate, the second sensing electrode layer including at least one second sensing electrode;

[0013] The at least one first sensing electrode corresponds one-to-one with the at least one second sensing electrode, and the orthographic projection of each first sensing electrode on the flexible substrate overlaps with the orthographic projection of the corresponding second sensing electrode on the flexible substrate.

[0014] Optionally, the display area is configured with:

[0015] The flexible substrate;

[0016] A thin-film transistor array layer located on the flexible substrate;

[0017] An OLED device layer is located on the side of the thin-film transistor array layer away from the flexible substrate. The OLED device layer includes multiple light-emitting units, each of which includes an anode, a cathode, and an organic light-emitting layer located between the anode and the cathode.

[0018] The thin-film encapsulation layer is located on the side of the OLED device layer away from the flexible substrate;

[0019] A first touch electrode layer located on the side of the thin film encapsulation layer away from the flexible substrate, the first touch electrode layer including at least one first touch electrode;

[0020] An insulating layer located on the side of the first touch electrode layer away from the flexible substrate;

[0021] A second touch electrode layer is located on the side of the insulating layer away from the flexible substrate, and the second touch electrode layer includes at least one second touch electrode;

[0022] The at least one first touch electrode and the at least one second touch electrode are arranged in an alternating pattern.

[0023] Optionally, the first sensing electrode layer and the first touch electrode layer are made of the same layer and the same material; and

[0024] The second sensing electrode layer and the second touch electrode layer are made of the same layer and the same material.

[0025] Optionally, the flexible display panel further includes:

[0026] A flexible circuit board is disposed in the lower frame area, and the control circuit of the pyroelectric sensor is disposed on the flexible circuit board.

[0027] Optionally, the flexible display panel further includes:

[0028] At least one first sensing electrode lead, one end of the first sensing electrode lead is connected to the first sensing electrode, and the other end is connected to the control circuit of the pyroelectric sensor. The first sensing electrode lead includes a first part located in the upper frame region, a second part connected to the first part and located in the side frame region, and a third part connected to the second part and located in the lower frame region.

[0029] At least one second sensing electrode lead, one end of which is connected to the second sensing electrode and the other end of which is connected to the control circuit of the pyroelectric sensor. The second sensing electrode lead includes a fourth portion located in the upper frame region, a fifth portion connected to the fourth portion and located in the side frame region, and a sixth portion connected to the fifth portion and located in the lower frame region.

[0030] Optionally, the material of the pyroelectric thin film includes at least one of the following:

[0031] Polyvinylidene fluoride, polyvinyl fluoride.

[0032] Optionally, the pyroelectric sensing region is further provided with a protective layer located on the side of the second sensing electrode layer away from the flexible substrate.

[0033] Optionally, the flexible display panel further includes:

[0034] A polarizer is located in the display area and the surrounding area, the polarizer being located on the side of the protective layer away from the flexible substrate;

[0035] The cover glass is located on the side of the polarizer away from the flexible substrate;

[0036] An optically transparent adhesive located between the polarizer and the cover glass is used to bond the polarizer and the cover glass together.

[0037] A second aspect of the present invention provides a display device including the flexible display panel described above.

[0038] A third aspect of the present invention provides a method for manufacturing a flexible display panel, the flexible display panel comprising: a display area and a border area surrounding the display area, the border area comprising an upper border area, a lower border area, and a side border area connecting the upper border area and the lower border area, the upper border area comprising at least one pyroelectric sensing area, characterized in that the manufacturing method comprises:

[0039] A flexible substrate is disposed in the pyroelectric sensing region;

[0040] A thin-film encapsulation layer is formed on the flexible substrate;

[0041] A pyroelectric sensor is formed on the side of the thin-film encapsulation layer away from the flexible substrate. The pyroelectric sensor is used to generate electrical signals of different intensities after receiving infrared radiation of different intensities.

[0042] The embodiments of the present invention have the following beneficial effects:

[0043] The flexible display panel provided in this invention can detect temperature changes using a pyroelectric sensor, generate an electrical signal, and feed it back to the phone's control chip. Under the control of the phone's control chip, the backlight is turned off, saving battery power and extending the phone's standby time. Furthermore, the pyroelectric sensor provided in this invention does not require an opening in the sensing area to house the sensor, enabling a full-screen display. Attached Figure Description

[0044] Figure 1 This is a top view of a flexible display panel provided in an embodiment of the present invention;

[0045] Figure 2 The flexible display panel provided in the embodiments of the present invention has the following characteristics: Figure 1 Schematic diagram of the cross section along the AA' section line;

[0046] Figure 3 This is a schematic diagram of the film layer structure of the flexible display panel in the display area provided in an embodiment of the present invention;

[0047] Figure 4 This is a schematic diagram of the film layer structure in the peripheral region of a flexible display panel provided in an embodiment of the present invention;

[0048] Figure 5 The response diagram of the pyroelectric sensor provided in this embodiment of the invention under two touches;

[0049] Figure 6 A flowchart illustrating the manufacturing method of a flexible display panel provided in an embodiment of the present invention.

[0050] Figure Labels

[0051] 1 Display Area

[0052] 2. Border area

[0053] 3. Pyroelectric sensing area

[0054] 4 Flexible circuit board

[0055] 5. Control circuit of pyroelectric sensor

[0056] 6 Flexible substrate

[0057] 7 Thin-film encapsulation layer

[0058] 8 First Induction Electrode Layer

[0059] 9. Pyroelectric thin films

[0060] 10 Second sensing electrode layer

[0061] 11 Protective Layer

[0062] 12 Polarizing film

[0063] 13 Optical transparent adhesive

[0064] 14 Cover glass

[0065] 15 Thin-film transistor array layer

[0066] 16 OLED device layers

[0067] 17 First Touch Electrode Layer

[0068] 18 Insulation layer

[0069] 19 Second touch electrode layer Detailed Implementation

[0070] To make the technical problems, technical solutions and advantages of the embodiments of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0071] In related technologies, an opening is usually made at the top of the phone screen to accommodate essential basic functional components such as the front-facing camera, earpiece, proximity sensor, and light sensor, which cannot truly achieve a full-screen display.

[0072] To address the aforementioned problems, embodiments of the present invention provide a flexible display panel.

[0073] The flexible display panel provided in this embodiment of the invention includes: a display area and a border area surrounding the display area. The border area includes an upper border area, a lower border area, and a side border area connecting the upper border area and the lower border area. The upper border area includes at least one pyroelectric sensing area, and the pyroelectric sensing area is provided with:

[0074] Flexible substrate;

[0075] A thin-film encapsulation layer located on the flexible substrate;

[0076] A pyroelectric sensor located on the side of the thin-film encapsulation layer away from the flexible substrate is used to generate electrical signals of different intensities after receiving infrared radiation of different intensities.

[0077] Figure 1 This is a top view of the flexible display panel provided in an embodiment of the present invention. Figure 2 The flexible display panel provided in the embodiments of the present invention has the following characteristics: Figure 1 A schematic diagram of the cross-section along section line AA'. (Reference) Figure 1 and Figure 2 The flexible display panel provided in this embodiment of the invention includes a display area 1 and a border area 2 surrounding the display area 1. The border area 2 includes an upper border area, a lower border area and a side border area connecting the upper border area and the lower border area, wherein the upper border area includes at least one pyroelectric sensing area 3.

[0078] The pyroelectric sensing region 3 is provided with a flexible substrate 6, which is a flexible insulating material, such as polyimide (PI), polycarbonate (PC), polyethersulfone (PES), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyaryl compounds (PAR), or glass fiber reinforced plastic (FRP). The flexible substrate 6 can be transparent, translucent, or opaque.

[0079] The pyroelectric sensing region 3 is further provided with a thin-film encapsulation layer 7 located on the flexible substrate 6. The thin-film encapsulation layer 7 can isolate water and oxygen, preventing the film layer it covers from being corroded by water and oxygen. The thin-film encapsulation layer 7 includes an inorganic layer and an organic layer stacked sequentially.

[0080] The pyroelectric sensing region 3 is also provided with a pyroelectric sensor located on the side of the thin film encapsulation layer 7 away from the flexible substrate 6. The pyroelectric sensor is used to generate electrical signals of different intensities after receiving infrared radiation of different intensities.

[0081] Optionally, the pyroelectric sensor includes:

[0082] A first sensing electrode layer located on the side of the thin film encapsulation layer away from the flexible substrate, the first sensing electrode layer including at least one first sensing electrode;

[0083] A pyroelectric thin film located on the side of the first sensing electrode layer away from the flexible substrate, the pyroelectric thin film being used to release charge when a temperature change is caused by infrared radiation;

[0084] A second sensing electrode layer located on the side of the pyroelectric thin film away from the flexible substrate, the second sensing electrode layer including at least one second sensing electrode;

[0085] The at least one first sensing electrode corresponds one-to-one with the at least one second sensing electrode, and the orthographic projection of each first sensing electrode on the flexible substrate overlaps with the orthographic projection of the corresponding second sensing electrode on the flexible substrate.

[0086] Figure 5 This is a response diagram of the pyroelectric sensor provided in an embodiment of the present invention under two touches. Assuming the finger temperature is 35.5°C and the temperature of the pyroelectric sensor in the absence of infrared radiation is 24°C, when the finger approaches the pyroelectric sensor, the temperature sensed by the pyroelectric sensor reaches 28.7°C. Figure 5 This shows the response curves when a finger approaches the pyroelectric sensor twice. When the finger is not close to the pyroelectric sensor, the voltage output of the pyroelectric sensor is almost zero, while when the finger approaches the pyroelectric sensor, the voltage output of the pyroelectric sensor reaches more than 0.00020V.

[0087] The pyroelectric sensor provided in this invention can capture minute temperature changes through a pyroelectric thin film. When a finger or ear is close to the phone screen, the pyroelectric sensor detects the temperature change, generates an electrical signal, and feeds it back to the phone's control chip. Under the control of the phone's control chip, the backlight is turned off, saving battery power and extending the phone's standby time.

[0088] In addition, related technologies typically use infrared distance sensors to detect whether a finger or ear is close to the phone screen, thus requiring an opening at the top of the screen. However, this opening design prevents the phone from achieving a true full-screen display.

[0089] refer to Figure 2 The pyroelectric sensor provided in this embodiment of the invention includes a first sensing electrode layer 8 located on the side of the thin film encapsulation layer 7 away from the flexible substrate 6, a pyroelectric thin film 9 located on the side of the first sensing electrode layer 8 away from the flexible substrate 6, and a second sensing electrode layer 10 located on the side of the pyroelectric thin film 9 away from the flexible substrate 6.

[0090] The first sensing electrode layer 8 includes at least one first sensing electrode, and the second sensing electrode layer 10 includes at least one second sensing electrode.

[0091] The at least one first sensing electrode corresponds to the at least one second sensing electrode, and the orthographic projection of each first sensing electrode on the flexible substrate 6 overlaps with the orthographic projection of the corresponding second sensing electrode on the flexible substrate 6.

[0092] refer to Figure 1 , Figure 1 A pyroelectric sensing region 3 is shown, and only a first sensing electrode and a second sensing electrode are provided in the pyroelectric sensing region 3. The orthographic projection of the first sensing electrode on the flexible substrate 6 overlaps with the orthographic projection of the second sensing electrode on the flexible substrate 6.

[0093] It should be noted that, depending on the application scenario, multiple pyroelectric sensing regions can be set, and multiple pairs of sensing electrodes can be set in each pyroelectric sensing region. The larger the pyroelectric sensing region, the more timely the response to temperature changes.

[0094] Furthermore, at least one first sensing electrode and at least one second sensing electrode can also be arranged in a cross configuration, thereby enabling both temperature sensing and position detection.

[0095] Optionally, the display area is configured with:

[0096] The flexible substrate;

[0097] A thin-film transistor array layer located on the flexible substrate;

[0098] An OLED device layer is located on the side of the thin-film transistor array layer away from the flexible substrate. The OLED device layer includes multiple light-emitting units, each of which includes an anode, a cathode, and an organic light-emitting layer located between the anode and the cathode.

[0099] The thin-film encapsulation layer is located on the side of the OLED device layer away from the flexible substrate;

[0100] A first touch electrode layer located on the side of the thin film encapsulation layer away from the flexible substrate, the first touch electrode layer including at least one first touch electrode;

[0101] An insulating layer located on the side of the first touch electrode layer away from the flexible substrate;

[0102] A second touch electrode layer is located on the side of the insulating layer away from the flexible substrate, and the second touch electrode layer includes at least one second touch electrode;

[0103] The at least one first touch electrode and the at least one second touch electrode are arranged in an alternating pattern.

[0104] The aforementioned film structure in the display area enables the display panel to have good flexibility, a thin and light size, low power consumption, and resistance to rubbing.

[0105] In addition, the materials of organic light-emitting layers are generally solid materials, which have good shock resistance. Furthermore, the use of organic light-emitting materials allows for a wider viewing angle of flexible display panels, and the luminous efficiency of organic light-emitting materials is higher and the energy consumption is lower.

[0106] In addition, the touch electrode layer enables effective touch control and can detect the touch position of the finger in real time.

[0107] refer to Figure 3 , Figure 3 This is a schematic diagram of the film layer structure in the display area of ​​a flexible display panel provided in an embodiment of the present invention.

[0108] The flexible substrate 6 is disposed in the display area 1.

[0109] The display area 1 is further provided with a thin-film transistor array layer 15 located on the flexible substrate 6. The thin-film transistor array layer includes multiple thin-film transistors, each comprising a semiconductor active layer, a gate electrode, a source electrode, and a drain electrode. The semiconductor active layer includes a source region and a drain region formed by doping with N-type or P-type impurity ions. The region between the source and drain regions is a channel region in which no impurities are doped.

[0110] The display area 1 is further provided with an OLED device layer 16 located on the side of the thin-film transistor array layer 15 away from the flexible substrate 6. The OLED device layer 16 includes multiple light-emitting units, each including an anode, a cathode, and an organic light-emitting layer located between the anode and the cathode. The anode and the drain of the thin-film transistor are electrically connected. The organic light-emitting layer includes low-molecular-weight organic materials or high-molecular-weight organic materials. In addition, the organic light-emitting layer may also include at least one of a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL).

[0111] The display area 1 is also provided with a thin film encapsulation layer 7 located on the side of the OLED device layer 16 away from the flexible substrate 6.

[0112] The display area 1 is further provided with a first touch electrode layer 17 located on the side of the thin film encapsulation layer 7 away from the flexible substrate 6. The first touch electrode layer 17 includes at least one first touch electrode. The first touch electrode layer 17 is a metal mesh, and the metal can be silver or copper.

[0113] The display area 1 is also provided with an insulating layer 18 located on the side of the first touch electrode layer 17 away from the flexible substrate 6.

[0114] The display area 1 is further provided with a second touch electrode layer 19 located on the side of the insulating layer 18 away from the flexible substrate 6, the second touch electrode layer 19 including at least one second touch electrode. The first touch electrode layer 19 is a metal mesh, and the metal can be silver or copper.

[0115] The at least one first touch electrode and the at least one second touch electrode are arranged in an alternating pattern.

[0116] Optionally, the first sensing electrode layer and the first touch electrode layer are made of the same layer and the same material; and

[0117] The second sensing electrode layer and the second touch electrode layer are made of the same layer and the same material.

[0118] refer to Figure 2 and Figure 3 The first sensing electrode layer 8 and the first touch electrode layer 17 are made of the same layer and the same material; and

[0119] The second sensing electrode layer 10 and the second touch electrode layer 19 are made of the same layer and the same material.

[0120] The flexible display panel provided in this embodiment of the invention achieves a full-screen display because the sensing electrode layer of the pyroelectric sensor is integrated with the touch electrode layer of the flexible display panel, thus eliminating the need for openings in the mobile phone screen.

[0121] Optionally, the flexible display panel further includes:

[0122] A flexible circuit board is disposed in the lower frame area, and the control circuit of the pyroelectric sensor is disposed on the flexible circuit board.

[0123] The pyroelectric sensor provided in this embodiment of the invention can detect temperature changes, generate electrical signals, and transmit them to a control circuit. The control circuit converts the voltage signals into data signals and performs digital algorithm processing on the digital signals. Furthermore, the control circuit is connected to the mobile phone's control chip. Under the control of the mobile phone's control chip, the backlight is turned off, saving battery power and extending the phone's standby time.

[0124] refer to Figure 1 The flexible display panel provided in this embodiment of the invention also includes a flexible circuit board 5 disposed in the lower frame area, and the control circuit 5 of the pyroelectric sensor is disposed on the flexible circuit board 4.

[0125] Optionally, the flexible display panel further includes: at least one first sensing electrode lead, one end of the first sensing electrode lead being connected to the first sensing electrode, and the other end being connected to the control circuit of the pyroelectric sensor. The first sensing electrode lead includes a first portion located in the upper frame region, a second portion connected to the first portion and located in the side frame region, and a third portion connected to the second portion and located in the lower frame region.

[0126] At least one second sensing electrode lead, one end of which is connected to the second sensing electrode and the other end of which is connected to the control circuit of the pyroelectric sensor. The second sensing electrode lead includes a fourth portion located in the upper frame region, a fifth portion connected to the fourth portion and located in the side frame region, and a sixth portion connected to the fifth portion and located in the lower frame region.

[0127] The induction electrode leads can transmit the electrical signals generated by the pyroelectric sensor to the control circuit, facilitating subsequent electrical signal processing.

[0128] refer to Figure 1 , Figure 1 A first sensing electrode lead and a second sensing electrode lead are shown. Both the first and second sensing electrode leads are routed sideways.

[0129] Optionally, the material of the pyroelectric film includes at least one of the following: polyvinylidene fluoride and polyvinylidene fluoride.

[0130] Polyvinylidene fluoride (PVDF) mainly refers to homopolymers of vinylidene fluoride or copolymers of vinylidene fluoride with other small amounts of fluorinated vinyl monomers. It combines the characteristics of fluoropolymers and general-purpose resins. In addition to having good chemical corrosion resistance, high temperature resistance, oxidation resistance, weather resistance, and radiation resistance, it also has special properties such as piezoelectricity, dielectricity, and thermoelectricity.

[0131] As an example, the pyroelectric thin film in this embodiment of the invention uses PVDF and is disposed on the first sensing electrode layer 8 in the form of a coating, and requires drying and polarization treatment.

[0132] Optionally, the pyroelectric sensing region is further provided with a protective layer located on the side of the second sensing electrode layer away from the flexible substrate.

[0133] refer to Figure 2 The pyroelectric sensing region 3 is further provided with a protective layer 11 located on the side of the second sensing electrode layer 10 away from the flexible substrate 6. The protective layer is elastic and is used to prevent the pyroelectric sensor from undergoing elastic deformation when subjected to external force.

[0134] refer to Figure 3 The display area may also be provided with a protective layer 11 located on the side of the second touch electrode layer 19 away from the flexible substrate 6.

[0135] Optionally, the flexible display panel further includes:

[0136] A polarizer is located in the display area and the surrounding area, the polarizer being located on the side of the protective layer away from the flexible substrate;

[0137] The cover glass is located on the side of the polarizer away from the flexible substrate;

[0138] An optically transparent adhesive located between the polarizer and the cover glass is used to bond the polarizer and the cover glass together.

[0139] Polarizing films can prevent ambient light from being reflected off the phone screen, thereby improving display contrast.

[0140] The cover glass protects the various film layers inside the phone from damage and also serves to enhance its appearance.

[0141] Optical transparent adhesive can prevent the polarizer from separating from the cover glass.

[0142] Figure 4 This is a schematic diagram of the film layer structure in the peripheral region of the flexible display panel provided in an embodiment of the present invention, with reference to... Figure 4 , Figure 4 exist Figure 2 Based on this, polarizer 12, optical transparent adhesive 13, and cover glass 14 were added.

[0143] Embodiments of the present invention also provide a flexible display device, including the flexible display substrate described above.

[0144] Therefore, the flexible display device provided in the embodiments of the present invention, when including the above-mentioned flexible display panel, also has the above-mentioned beneficial effects, which will not be repeated here.

[0145] The flexible display device includes, but is not limited to, components such as: a radio frequency unit, a network module, an audio output unit, an input unit, a sensor, a display unit, a user input unit, an interface unit, a memory, a processor, and a power supply. Those skilled in the art will understand that the above-described structure of the display device does not constitute a limitation on the display device; the display device may include more or fewer of the aforementioned components, or combine certain components, or arrange different components. In embodiments of the present invention, the display device includes, but is not limited to, a monitor, a mobile phone, a tablet computer, a television set, a wearable electronic device, a navigation display device, etc.

[0146] The flexible display device can be any product or component with display function, such as a television, monitor, digital photo frame, mobile phone, or tablet computer.

[0147] Embodiments of the present invention also provide a method for manufacturing a flexible display panel, the flexible display panel comprising: a display area and a border area surrounding the display area, the border area comprising an upper border area, a lower border area, and a side border area connecting the upper border area and the lower border area, the upper border area comprising at least one pyroelectric sensing area, wherein the manufacturing method comprises:

[0148] A flexible substrate is disposed in the pyroelectric sensing region;

[0149] A thin-film encapsulation layer is formed on the flexible substrate;

[0150] A pyroelectric sensor is formed on the side of the thin-film encapsulation layer away from the flexible substrate. The pyroelectric sensor is used to generate electrical signals of different intensities after receiving infrared radiation of different intensities.

[0151] refer to Figure 6 , Figure 6 A flowchart illustrating the manufacturing method of a flexible display panel provided in an embodiment of the present invention.

[0152] The manufacturing method includes:

[0153] S602: A flexible substrate is disposed in the pyroelectric sensing area.

[0154] S604: Form a thin film encapsulation layer on the flexible substrate.

[0155] S606: Form a pyroelectric sensor located on the side of the thin film encapsulation layer away from the flexible substrate, the pyroelectric sensor being used to generate electrical signals of different intensities after receiving infrared radiation of different intensities.

[0156] In the various method embodiments of the present invention, the sequence numbers of each step are not intended to limit the order of the steps. For those skilled in the art, any changes in the order of the steps without creative effort are also within the scope of protection of the present invention.

[0157] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, since the embodiments are basically similar to the product embodiments, the descriptions are relatively simple, and the relevant parts can be referred to the descriptions of the product embodiments.

[0158] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0159] It is understandable that when a component such as a layer, film, region, or substrate is referred to as being "above" or "below" another component, the component may be "directly" located "above" or "below" the other component, or there may be intermediate components present.

[0160] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0161] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A flexible display panel, comprising: A display area and a frame area surrounding the display area, the frame area including oppositely arranged upper and lower frame areas and side frame areas connecting the upper and lower frame areas, characterized in that the upper frame area includes at least one pyroelectric sensing area, the pyroelectric sensing area being provided with: a flexible substrate; a thin film encapsulation layer on the flexible substrate; a pyroelectric sensor on a side of the thin film encapsulation layer away from the flexible substrate, the pyroelectric sensor being configured to generate electrical signals of different intensities upon receiving infrared radiation of different intensities; the pyroelectric sensor specifically including: a first sensing electrode layer on a side of the thin film encapsulation layer away from the flexible substrate; a pyroelectric thin film on a side of the first sensing electrode layer away from the flexible substrate, the pyroelectric thin film being configured to release electric charges upon a temperature change caused by infrared radiation; a second sensing electrode layer on a side of the pyroelectric thin film away from the flexible substrate; the at least one first sensing electrode and the at least one second sensing electrode correspond to each other, and a normal projection of each first sensing electrode on the flexible substrate overlaps a normal projection of a corresponding second sensing electrode on the flexible substrate; the sensing electrode layers of the pyroelectric sensor and the touch electrode layers of the flexible display panel are designed in an integrated manner; the display area is provided with: a first touch electrode layer on a side of the thin film encapsulation layer away from the flexible substrate, the first touch electrode layer including at least one first touch electrode; an insulating layer on a side of the first touch electrode layer away from the flexible substrate; a second touch electrode layer on a side of the insulating layer away from the flexible substrate, the second touch electrode layer including at least one second touch electrode; the at least one first touch electrode and the at least one second touch electrode are arranged in a cross manner; the first sensing electrode layer and the first touch electrode layer are made of the same material in the same layer; and the second sensing electrode layer and the second touch electrode layer are made of the same material in the same layer; a flexible circuit board arranged in the lower frame area, the flexible circuit board being provided with a control circuit of the pyroelectric sensor; further including: at least one first sensing electrode lead, one end of the first sensing electrode lead being connected to the first sensing electrode, and the other end of the first sensing electrode lead being connected to the control circuit of the pyroelectric sensor, the first sensing electrode lead including a first portion located in the upper frame area, a second portion connected to the first portion and located in the side frame area, and a third portion connected to the second portion and located in the lower frame area; at least one second sensing electrode lead, one end of the second sensing electrode lead being connected to the second sensing electrode, and the other end of the second sensing electrode lead being connected to the control circuit of the pyroelectric sensor, the second sensing electrode lead including a fourth portion located in the upper frame area, a fifth portion connected to the fourth portion and located in the side frame area, and a sixth portion connected to the fifth portion and located in the lower frame area; the first sensing electrode lead and the second sensing electrode lead both adopt a side wiring manner.

2. The flexible display panel of claim 1, wherein, the display area further includes: the flexible substrate; a thin film transistor array layer on the flexible substrate; an OLED device layer on a side of the thin film transistor array layer distal to the flexible substrate, the OLED device layer including a plurality of light emitting units, the light emitting units including an anode, a cathode, and an organic light emitting layer between the anode and the cathode; the thin film encapsulation layer on a side of the OLED device layer distal to the flexible substrate.

3. The flexible display panel of claim 1, wherein, The material of the pyroelectric thin film includes at least one of: polyvinylidene fluoride, polyvinyl fluoride.

4. The flexible display panel of claim 1, wherein, The pyroelectric sensing region is further provided with a protective layer on a side of the second sensing electrode layer distal to the flexible substrate.

5. The flexible display panel of claim 4, wherein, Further comprising: a polarizing plate on the display region and the frame region, the polarizing plate being on a side of the protective layer distal to the flexible substrate; a cover plate glass on a side of the polarizing plate distal to the flexible substrate; an optically transparent adhesive between the polarizing plate and the cover plate glass, for bonding the polarizing plate and the cover plate glass.

6. A flexible display device comprising the flexible display panel according to any one of claims 1-5.

7. A method for manufacturing a flexible display panel as claimed in any one of the claims 1-5, the flexible display panel comprising: a display region and a frame region surrounding the display region, the frame region including oppositely arranged upper and lower frame regions and side frame regions connecting the upper and lower frame regions, the upper frame region including at least one pyroelectric sensing region, and the manufacturing method comprising: providing a flexible substrate on the pyroelectric sensing region; forming a thin film encapsulation layer on the flexible substrate; forming a pyroelectric sensor on a side of the thin film encapsulation layer distal to the flexible substrate, the pyroelectric sensor being configured to generate an electrical signal of different intensity in response to receiving infrared radiation of different intensity.

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