Display panel, display device, pressure detection method and manufacturing method

Abstract

The invention discloses a display panel, a display device, a pressure detection method and a manufacturing method. The display panel in one embodiment comprises a substrate, and at least one transmission optical fiber, a planarization layer and a light-emitting composite layer which are sequentially stacked on the substrate, the display panel comprises a display area and a non-display area. The transmission optical fiber comprises a plurality of pressure sensors which are connected in series in the extension direction of the transmission optical fiber, each pressure sensor comprises a fiber core, a first wrapping layer wrapping the outer side of the fiber core and a second wrapping layer wrapping the outer side of the first wrapping layer, and the thickness of the second wrapping layer is larger than that of the first wrapping layer. The transmission optical fiber accesses the first optical signal, is arranged between the non-display area and the display area in an extending mode and outputs a second optical signal. According to the embodiment provided by the invention, the pressure sensor with the double cladding is formed on the transmission optical fiber, the transmission optical fiber is arranged in the display panel, and the pressure sensor is utilized to respond to the deformation of the display panel due to pressure bearing, so that the display panel has practical application value.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a display panel, a display device, a pressure detection method and a manufacturing method. Background Art

[0002] With the rapid development of science and technology, display-related technologies have occupied an important position in various fields of engineering and life. In the early days of display technology development, the mainstream display technology was cathode ray tube CRT (Cathode Ray Tube). Currently, common display technologies include liquid crystal display technology LCD (Liquid Crystal Display) and organic light emitting diode OLED (Organic Light Emitting Diode). OLED display technology is gradually replacing the LCD market. Compared with traditional CRT and LCD display technologies, it has obvious advantages, such as fast response speed, high color contrast, thin and light structure, bendable, wide viewing angle, etc.

[0003] However, in actual applications, it is found that organic light emitting diode display devices are prone to permanent damage when subjected to external stress or pressure. Therefore, how to detect whether the display device is subjected to pressure has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] In order to solve at least one of the above problems, the first embodiment of the present invention provides a display panel, comprising: a substrate, and at least one transmission optical fiber, a planarization layer and a light-emitting composite layer sequentially stacked on the substrate; wherein

[0005] The display panel comprises a display area and a non-display area surrounding the display area, wherein the display area comprises a first side and a second side arranged opposite to each other;

[0006] The transmission optical fiber comprises a plurality of pressure sensors connected in series along the extending direction of the transmission optical fiber, the pressure sensor comprises a core, a first cladding wrapped outside the core, and a second cladding wrapped outside the first cladding, the thickness of the second cladding being greater than the thickness of the first cladding;

[0007] The transmission optical fiber includes a first end, a second end, and an optical fiber body, wherein the first end receives a first optical signal and the second end outputs a second optical signal, and the optical fiber body includes a first optical fiber sub-body, a second optical fiber sub-body, and a third optical fiber sub-body, the first optical fiber sub-body passes through the display area from a non-display area close to the first edge and extends to a non-display area close to the second edge, the second optical fiber sub-body is located in the non-display area close to the second edge, the third optical fiber sub-body passes through the display area from a non-display area close to the second edge and extends to a non-display area close to the first edge, and the multiple pressure sensors are located in the display area and are arranged on the first optical fiber sub-body and the third optical fiber sub-body.

[0008] For example, in the display panel provided in some embodiments of the present application, the plurality of pressure sensors include a plurality of first pressure sensors disposed on the first optical fiber sub-body, and second pressure sensors disposed on the third optical fiber sub-body and corresponding one-to-one to the first pressure sensors.

[0009] For example, in the display panel provided in some embodiments of the present application, the planarization layer of the display panel is made of the same material as the second cladding layer of the pressure sensor, and the planarization layer and the second cladding layer of the pressure sensor are formed in the same manufacturing step.

[0010] For example, in the display panel provided in some embodiments of the present application, the elastic modulus of the second cladding layer is smaller than the elastic modulus of the first cladding layer.

[0011] For example, in the display panel provided in some embodiments of the present application,

[0012] The material of the first cladding layer is SiO2, and the thickness of the first cladding layer is greater than or equal to 3 μm and less than or equal to 5 μm;

[0013] The material of the second cladding layer is SiNx, the thickness of the second cladding layer is greater than or equal to 30 μm and less than or equal to 50 μm, and the length of the second cladding layer is greater than or equal to 2 mm and less than or equal to 4 mm.

[0014] For example, in the display panel provided in some embodiments of the present application, a plurality of adhesive portions are provided on the substrate, the transmission optical fiber is attached to the substrate through the adhesive portions, and the orthographic projection of the adhesive portions on the substrate does not overlap with the orthographic projection of the pressure sensor on the substrate.

[0015] For example, in the display panel provided in some embodiments of the present application, the light-emitting composite layer includes a driving circuit layer, an organic light-emitting diode light-emitting functional layer and an encapsulation layer stacked on the planarization layer.

[0016] A second embodiment of the present invention provides a display device, comprising a processor, an optical module, and the display panel as described in the first embodiment, wherein

[0017] The optical module is used to output a first optical signal to a transmission optical fiber of the display panel, and to obtain a light intensity signal according to a second optical signal output by the transmission optical fiber;

[0018] The processor is used for obtaining the pressure borne by the display panel according to the light intensity signal.

[0019] For example, in the display device provided in some embodiments of the present application, the optical module includes a broadband light source and an optical signal processing unit, wherein:

[0020] The broadband light source is used to generate broadband light as the first optical signal and transmit it to one end of the transmission optical fiber;

[0021] The optical signal processing unit is connected to the other end of the transmission optical fiber and is used for converting the second optical signal output by the transmission optical fiber into an electrical signal to obtain the light intensity signal of the second optical signal.

[0022] A third embodiment of the present invention provides a pressure detection method using the display device described in the second embodiment, comprising:

[0023] The optical module of the display device outputs a first optical signal to a transmission optical fiber of the display panel;

[0024] The optical module receives the second optical signal output by the transmission optical fiber to obtain a light intensity signal;

[0025] The processor of the display device obtains the pressure borne by the display panel according to the light intensity signal.

[0026] For example, in some embodiments of the present application, the pressure detection method further includes:

[0027] In response to the pressure on the display panel being greater than or equal to a preset pressure threshold, preset pressure alarm information is presented on the display panel.

[0028] A fourth embodiment of the present invention provides a method for manufacturing the display panel described in the first embodiment, comprising:

[0029] Etching the position of the pressure sensor to be formed on the transmission optical fiber to form an intermediate pressure sensor having a core and a first cladding;

[0030] encapsulating the intermediate pressure sensor with a second encapsulation material to form a pressure sensor having a second encapsulation;

[0031] attaching the transmission optical fiber to a substrate;

[0032] forming a planarization layer covering the transmission optical fiber and the substrate;

[0033] A light emitting composite layer is formed on the planarization layer.

[0034] For example, in the manufacturing methods provided in some embodiments of the present application, the step of using a second cladding material to clad the intermediate pressure sensor to form a pressure sensor having a second cladding, attaching the transmission optical fiber to a substrate, and forming a planarization layer covering the transmission optical fiber and the substrate further comprises:

[0035] attaching a transmission optical fiber including the intermediate pressure sensor to the substrate;

[0036] A second cladding layer and a planarization layer of the intermediate pressure sensor are formed using a planarization layer material.

[0037] The beneficial effects of the present invention are as follows:

[0038] In view of the existing problems, the present invention develops a display panel, a display device, a pressure detection method and a manufacturing method. The display panel of one embodiment of the present invention forms a pressure sensor with a double cladding on a transmission optical fiber, and sets the transmission optical fiber in the display panel. The pressure sensor responds to the deformation of the display panel under pressure, causing the light intensity of the optical signal transmitted by the transmission optical fiber to change to achieve pressure detection, thereby compensating for the problems existing in the prior art. In particular, in a display device of one embodiment of the present invention, the optical module of the display device provides a first optical signal to the transmission optical fiber and obtains a corresponding light intensity signal according to the second optical signal output by the transmission optical fiber. The processor of the display device obtains the pressure on the display panel according to the light intensity signal, thereby realizing the detection of the pressure on the display device, effectively avoiding permanent damage to the display device due to external stress or pressure, and having practical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 A schematic diagram showing the structure of a display panel according to an embodiment of the present invention is shown;

[0041] Figure 2 A schematic diagram showing the structure of a display device according to an embodiment of the present invention;

[0042] Figure 3 A schematic diagram showing a transmission optical fiber and a pressure sensor according to an embodiment of the present invention;

[0043] Figure 4 A schematic diagram showing the structure of a transmission optical fiber and a pressure sensor according to an embodiment of the present invention is shown;

[0044] Figure 5 A flow chart showing a manufacturing method according to an embodiment of the present invention;

[0045] Figure 6 A schematic cross-sectional view showing a display panel according to an embodiment of the present invention;

[0046] Figure 7 A schematic diagram showing deformation of a display panel subjected to external pressure according to an embodiment of the present invention;

[0047] Figure 8 A structural block diagram showing a display device according to an embodiment of the present invention;

[0048] Fig. 9 A flow chart of a pressure detection method according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0049] In order to more clearly illustrate the present invention, the present invention is further described below in conjunction with preferred embodiments and accompanying drawings. Similar components in the accompanying drawings are represented by the same reference numerals. It should be understood by those skilled in the art that the content specifically described below is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention.

[0050] It should be noted that the terms “on…”, “formed on…” and “disposed on…” described herein may indicate that one layer is directly formed or disposed on another layer, or may indicate that one layer is indirectly formed or disposed on another layer, i.e., there are other layers between the two layers. In this article, unless otherwise specified, the term “located on the same layer” used means that two layers, parts, components, elements or parts can be formed by the same patterning process, and the two layers, parts, components, elements or parts are generally formed of the same material. In this article, unless otherwise specified, the expression “patterning process” generally includes steps such as coating, exposure, development, etching and stripping of photoresist. The expression “one-time patterning process” means a process of forming patterned layers, parts, components, etc. using a mask.

[0051] In view of the above situation, if Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a display panel, comprising: a substrate 10, and at least one transmission optical fiber 11, a planarization layer 13 and a light-emitting composite layer 14 sequentially stacked on the substrate; wherein

[0052] The display panel 300 includes a display area 302 and a non-display area 301 surrounding the display area 302, and the display area 302 includes a first side 3021 and a second side 3022 that are oppositely arranged;

[0053] The transmission optical fiber 11 includes a plurality of pressure sensors 12 connected in series along the extending direction of the transmission optical fiber 11, and the pressure sensor includes a core 121, a first cladding 122 wrapped around the outside of the core 121, and a second cladding 123 wrapped around the outside of the first cladding 122, wherein the thickness of the second cladding 123 is greater than the thickness of the first cladding 122;

[0054] The transmission optical fiber 11 includes a first end 111, a second end 112, and an optical fiber body, wherein the first end 111 receives a first optical signal, and the second end 112 outputs a second optical signal. The optical fiber body includes a first optical fiber sub-body 113, a second optical fiber sub-body 114, and a third optical fiber sub-body 115. The first optical fiber sub-body 113 passes through the display area 302 from a non-display area close to the first edge 3021 and extends to a non-display area close to the second edge 3022. The second optical fiber sub-body 114 is located in a non-display area close to the second edge 3022. The third optical fiber sub-body 115 passes through the display area 302 from a non-display area close to the second edge 3022 and extends to a non-display area close to the first edge 3021. The multiple pressure sensors 12A, 12B, 12C, and 12D are located in the display area 302 and are arranged on the first optical fiber sub-body 113 and the third optical fiber sub-body 115.

[0055] In this embodiment, the display panel forms a pressure sensor 12 with a double cladding on the transmission optical fiber 11, and the transmission optical fiber 11 is arranged inside the display panel, and the thickness of the second cladding is greater than the thickness of the first cladding 122, so that the pressure sensor 12 is more sensitive to the external stress or pressure on the display panel, resulting in a larger deformation, so that the optical signal transmitted by the transmission optical fiber 11 is partially leaked at the position of the core 121 of the pressure sensor 12, resulting in a change in the light intensity of the transmitted optical signal, thereby realizing the detection of the external stress or pressure on the display panel. That is, this embodiment uses the pressure sensor arranged inside the display panel to respond to the deformation of the display panel under pressure, causing the light intensity of the optical signal transmitted by the transmission optical fiber to change to realize pressure detection, which can make up for the problems existing in the prior art.

[0056] In a specific embodiment, Figure 2The display device including the display panel of the above embodiment is shown, including a processor 100, an optical module 200, and a display panel 300. The optical module 200 is used to output a first optical signal to the transmission optical fiber 11 of the display panel 300, and obtain a light intensity signal according to a second optical signal output by the transmission optical fiber 11; the processor 100 is used to obtain the pressure borne by the display panel 300 according to the light intensity signal. Figure 3 The figure shows a transmission optical fiber 11 and a pressure sensor 12 arranged on the transmission optical fiber 11. Specifically, Figure 4 The figure shows an enlarged view of the pressure sensor 12. The pressure sensor 12 is formed based on the transmission optical fiber 11. The core 121 of the pressure sensor 12 is the core of the transmission optical fiber 11. The first cladding 122 is a part of the transmission optical fiber 11. The thickness of the second cladding 123 is greater than the thickness of the first cladding 122, so that the sensing performance of the pressure sensor is more sensitive, the detection accuracy is higher, and the structure is more stable. In a specific example, as Figure 4 As shown, the material of the first cladding 122 is SiO2, the thickness T1 of the first cladding 122 is greater than or equal to 3μm and less than or equal to 5μm, the material of the second cladding 123 is SiNx, the thickness T2 of the second cladding 123 is greater than or equal to 30μm and less than or equal to 50μm, and the length L of the second cladding 123 is greater than or equal to 2mm and less than or equal to 4mm, that is, the length of the pressure sensor is greater than or equal to 2mm and less than or equal to 4mm.

[0057] To further illustrate the structure of the display panel of this embodiment, a specific process of manufacturing the display panel is taken as an example. Figure 5 As shown, including:

[0058] In the first step, etching is performed on the transmission optical fiber at the position where the pressure sensor is to be formed to form an intermediate pressure sensor having a core and a first cladding.

[0059] In this embodiment, a pressure sensor is fabricated on a micro-nano optical fiber using micro-machining technology, and a chemical etching solution, such as HF acid solution, is used to partially dissolve the cladding of the transmission optical fiber 3, and the dissolving length is controlled to be greater than or equal to 2 mm and less than or equal to 4 mm, and the thickness of the first cladding covering the core after dissolution is controlled to be greater than or equal to 3 μm and less than or equal to 5 μm. That is, by etching the position of the pressure sensor to be formed on the transmission optical fiber, an intermediate pressure sensor with a certain length including the core and the first cladding is formed.

[0060] In the second step, the intermediate pressure sensor is coated with a second coating material to form a pressure sensor with a second coating.

[0061] In this embodiment, the intermediate pressure sensor is coated with a second cladding material to form a second cladding having a certain thickness. For example, the second cladding material is plated on the first cladding through a plating operation to form a second cladding having a thickness greater than or equal to 30 μm and less than or equal to 50 μm. This makes the pressure sensor more sensitive to the external stress or pressure exerted on the display panel and undergoes a greater deformation in response to the pressure exerted on the display panel, thereby causing the optical signal transmitted by the transmission optical fiber to partially leak at the core position of the pressure sensor, resulting in a change in the light intensity of the transmitted optical signal, thereby realizing the detection of the external stress or pressure exerted on the display panel.

[0062] In an optional embodiment, the second cladding 123 uses a material with a smaller elastic modulus than the first cladding 122. That is, on the basis of the aforementioned embodiment, the sensing sensitivity and detection accuracy of the pressure sensor are further improved by using a second cladding with a smaller elastic modulus and a thicker material to cover a first cladding with a larger elastic modulus and a thinner material, thereby making the structure of the pressure sensor more stable.

[0063] Specifically, Figure 2 As shown, the display panel 300 includes a display area 302 and a non-display area 301 surrounding the display area 302, and the display area 302 includes a first side 3021 and a second side 3022 that are oppositely arranged, and a third side 3023 and a fourth side 3024 that are oppositely arranged;

[0064] The transmission optical fiber 11 includes a first end 111, a second end 112, and an optical fiber body, wherein the first end 111 is connected to a first optical signal transmitted by the optical module 200, and the second end 112 outputs a second optical signal to the optical module 200. The optical fiber body includes a first optical fiber sub-body 113, a second optical fiber sub-body 114, and a third optical fiber sub-body 115. The first optical fiber sub-body 113 passes through the display area 302 from a non-display area close to the first edge 3021 and extends to a non-display area close to the second edge 3022. The second optical fiber sub-body 114 is located in a non-display area close to the second edge 3022. The third optical fiber sub-body 115 passes through the display area 302 from a non-display area close to the second edge 3022 and extends to a non-display area close to the first edge 3021. The multiple pressure sensors 12A, 12B, 12C, and 12D are located in the display area 302 and are arranged on the first optical fiber sub-body 113 and the third optical fiber sub-body 115.

[0065] The pressure sensor of this embodiment is located in the display area and is used to sense the pressure on the display area of ​​the display panel. It is worth noting that this embodiment is only used to illustrate the specific implementation method of this application. This application does not specifically limit the position of the transmission optical fiber inside the display panel, and takes covering the display area as the basic design principle; at the same time, this application does not specifically limit the number of transmission optical fibers set inside the display panel, nor does it specifically limit the number of pressure sensors set on the transmission optical fiber; those skilled in the art should understand that when the number of transmission optical fibers set is more and the number of pressure sensors set is more, the pressure detection on the display panel is more sensitive, but the cost and manufacturing complexity are also increased accordingly. Those skilled in the art should set an appropriate number of transmission optical fibers and pressure sensors according to actual application requirements, with the design principle of being able to detect the pressure on the display panel, which will not be repeated here.

[0066] To further improve the accuracy of pressure detection, in an optional embodiment, Figure 2 As shown, the plurality of pressure sensors include a plurality of first pressure sensors 12A and 12C disposed on the first optical fiber sub-body 113, and second pressure sensors 12B and 12D disposed on the third optical fiber sub-body 115 and corresponding one-to-one to the first pressure sensors.

[0067] In this embodiment, a sensor array is formed by pressure sensors that are arranged in pairs and symmetrically on a transmission optical fiber. For example, a first pressure sensor 12A and a second pressure sensor 12B are arranged in pairs and symmetrically, and for example, a first pressure sensor 12C and a second pressure sensor 12D are arranged in pairs and symmetrically, thereby forming a sensor array including pressure sensors 12A, 12B, 12C and 12D. The optical module can detect changes in light intensity based on a first optical signal input from a first end 111 of the transmission optical fiber and a second optical signal output from a second end 112, and further obtains the pressure on the display panel through a processor, and obtains the position where the display panel is subjected to pressure according to a preset pressure position evaluation method, so that a user of the display device can know the pressure condition of the display panel.

[0068] The third step is to attach the transmission optical fiber to the substrate.

[0069] In this embodiment, considering the sensitivity requirement of the pressure sensor to the pressure on the display panel, such as Figure 1 and Figure 2As shown, a plurality of adhesive portions 303 are provided on the substrate 10 of the display panel, and the transmission optical fiber 11 is attached to the substrate 10 through the adhesive portions 303, and the orthographic projection of the adhesive portions 303 on the substrate 10 does not overlap with the orthographic projection of the pressure sensors 12A, 12B, 12C and 12D on the substrate 10. That is, the transmission optical fiber of this embodiment is fixed inside the display panel through the adhesive portions, and does not affect the sensing sensitivity of the pressure sensor.

[0070] The fourth step is to form a planarization layer covering the transmission optical fiber and the substrate.

[0071] In this embodiment, if Figure 1 As shown, considering the influence of the transmission optical fiber 11 and the pressure sensor 12 on the flatness of the display panel, before forming the light emitting composite layer 14, forming the planarization layer 13 also ensures the normal production of the light emitting composite layer.

[0072] The fifth step is to form a light-emitting composite layer on the planarization layer.

[0073] In this embodiment, if Figure 1 As shown, the film structures of the light-emitting composite layer are sequentially formed on the planarization layer 13, specifically including a driving circuit layer, an organic light-emitting diode light-emitting functional layer and a packaging layer stacked on the planarization layer. Figure 6 Shown Figure 2 The cross-sectional view along line EF in FIG. 1 includes a substrate 10, a planarization layer 13 covering the substrate 10 and the transmission optical fiber 11, and a light-emitting composite layer 14. The transmission optical fiber 11 and the pressure sensor 12 are included in the display area 302. Figure 7 The figure shows a schematic diagram of the display panel being subjected to external pressure. The display panel is deformed when pressed by external force. The pressure sensor 12 arranged inside the display panel senses the external force and is deformed, causing the leakage of the optical signal transmitted by the core of the pressure sensor 12, thereby changing the light intensity of the optical signal, thereby realizing the detection of the pressure borne by the display panel.

[0074] At this point, the display panel of this embodiment is manufactured. The display panel of this embodiment forms a double-clad pressure sensor on a transmission optical fiber, and sets the transmission optical fiber in the display panel, and uses the pressure sensor to respond to the deformation of the display panel under pressure, causing the light intensity of the optical signal transmitted by the transmission optical fiber to change to achieve pressure detection.

[0075] To further simplify costs, in an optional embodiment, during the process of manufacturing the display panel, the transmission optical fiber including the intermediate pressure sensor is attached to the substrate; and a second cladding layer and a flattening layer of the intermediate pressure sensor are formed using a flattening layer material.

[0076] In this embodiment, the second cladding of the pressure sensor is formed while forming the flattening layer of the display panel by reusing the flattening layer material, thereby simplifying the manufacturing process and manufacturing cost. Specifically, the formed transmission optical fiber with the intermediate pressure sensor is attached to the substrate through the adhesive portion, and the second cladding of the pressure sensor is formed simultaneously in the process of forming the flattening layer, thereby completing the preparation of the flattening layer and the second cladding in one manufacturing step. The flattening layer of the display panel is made of the same material as the second cladding of the pressure sensor, and the flattening layer and the second cladding of the pressure sensor are formed in the same manufacturing step. Specifically. For example, the material of the flattening layer is SiNx, and the elastic modulus of the flattening layer material is less than the elastic modulus of the first cladding of the pressure sensor, thereby forming a pressure sensor with a double cladding and higher sensitivity.

[0077] Based on the display panel of the aforementioned embodiment, Figure 2 As shown, an embodiment of the present invention provides a display device, including a processor 100, an optical module 200, and a display panel 300, wherein the optical module 200 is used to output a first optical signal to a transmission optical fiber 11 of the display panel 300, and obtain a light intensity signal according to a second optical signal output by the transmission optical fiber; the processor 100 is used to obtain the pressure that the display panel 300 is subjected to according to the light intensity signal.

[0078] In this embodiment, the external pressure on the display panel is sensed by a transmission optical fiber arranged inside the display panel and including a pressure sensor with a double cladding, and a first optical signal is provided to the transmission optical fiber through an optical module of the display device. The pressure sensor is used to respond to the deformation of the display panel caused by the pressure, thereby causing a change in the light intensity of the optical signal transmitted by the transmission optical fiber. The optical module obtains a corresponding light intensity signal based on the second optical signal output by the transmission optical fiber, and the pressure on the display panel is obtained by a processor of the display device based on the light intensity signal, thereby realizing the detection of the pressure on the display device and effectively avoiding permanent damage to the display device due to external stress or pressure.

[0079] In a specific embodiment, Figure 8 As shown, the optical module includes a broadband light source 201 and an optical signal processing unit 202, wherein the broadband light source 201 is used to generate broadband light as the first optical signal and transmit it to one end of the transmission optical fiber 11; the optical signal processing unit 202 is connected to the other end of the transmission optical fiber 11 and is used to convert the second optical signal output by the transmission optical fiber 11 into an electrical signal to obtain the light intensity signal of the second optical signal.

[0080] In this embodiment, a first optical signal transmitted by a transmission optical fiber is generated by a broad spectrum light source, and a second optical signal is outputted via pressure sensors 12A, 12B, 12C and 12D. When the display panel is subjected to external pressure, deformation occurs, such as Figure 7 As shown, the pressure sensor 12 senses external pressure and deforms, leaking part of the optical signal transmitted by the fiber core of the pressure sensor, thereby changing the light intensity of the optical signal, and optically processing the second optical signal output by the transmission optical fiber through the optical signal processing unit to convert the second optical signal into an electrical signal, and demodulates to obtain the light intensity signal of the second optical signal, so that the processor can further analyze the light intensity signal to obtain the pressure on the display panel.

[0081] Based on the display device of the above embodiment, Fig. 9 As shown, an embodiment of the present invention provides a pressure detection method, comprising:

[0082] The optical module of the display device outputs a first optical signal to a transmission optical fiber of the display panel;

[0083] The optical module receives the second optical signal output by the transmission optical fiber to obtain a light intensity signal;

[0084] The processor of the display device obtains the pressure borne by the display panel according to the light intensity signal.

[0085] In this embodiment, the optical module of the display device provides a first optical signal, for example, a broadband light source in the optical module generates broadband light as the first optical signal and outputs it to the transmission optical fiber, and then a second optical signal is output to the optical signal processing unit of the optical module through a plurality of pressure sensors on the transmission optical fiber, and then the optical signal processing unit converts the second optical signal and obtains a light intensity signal, and finally the processor obtains the pressure borne by the display panel according to the light intensity signal. Specifically, without considering normal transmission loss, when the display device is not subjected to external pressure, the light intensity of the second optical signal transmitted in the transmission optical fiber through the plurality of pressure sensors is substantially the same as the light intensity of the first optical signal input to the transmission optical fiber, for example, the light intensity difference between the two is within a preset fluctuation range; when the display device is subjected to external pressure, the light intensity of the second optical signal transmitted in the transmission optical fiber through the plurality of pressure sensors is significantly different from the light intensity of the first optical signal input to the transmission optical fiber, for example, the light intensity difference between the two is greater than the fluctuation range, and the external pressure borne by the display device can be obtained according to the light intensity difference.

[0086] To further prevent permanent damage to the display device due to external stress or pressure, in an optional embodiment, in response to the pressure on the display panel being greater than or equal to a preset pressure threshold, a preset pressure alarm message is presented on the display panel.

[0087] In this embodiment, a pressure threshold is set for the pressure that the display panel can withstand, and the pressure detected by the pressure sensor is judged based on the pressure threshold. When the detected pressure is greater than or equal to the pressure threshold, a pressure alarm message is presented on the display panel to prompt the user of the display device to prevent the display device from continuing to withstand pressure until permanent damage occurs.

[0088] Based on the display panel of the aforementioned embodiment, Figure 5 As shown, an embodiment of the present invention provides a method for manufacturing the above-mentioned display panel, comprising:

[0089] Etching the position of the pressure sensor to be formed on the transmission optical fiber to form an intermediate pressure sensor having a core and a first cladding;

[0090] encapsulating the intermediate pressure sensor with a second encapsulation material to form a pressure sensor having a second encapsulation;

[0091] attaching the transmission optical fiber to a substrate;

[0092] forming a planarization layer covering the transmission optical fiber and the substrate;

[0093] A light emitting composite layer is formed on the planarization layer.

[0094] In this embodiment, a pressure sensor with a double cladding layer formed based on a transmission optical fiber is formed in the display panel during the manufacturing process of the display panel, and the transmission optical fiber is arranged in the display panel. The pressure sensor is used to respond to the deformation of the display panel under pressure, causing the light intensity of the optical signal transmitted by the transmission optical fiber to change to achieve pressure detection. The display panel of this embodiment has a pressure detection function, and will not affect the display function of the display panel. The specific implementation method refers to the above embodiment, which will not be repeated here.

[0095] To further simplify the manufacturing process and reduce costs, in an optional embodiment, the transmission optical fiber including the intermediate pressure sensor is attached to the substrate; and a flattening layer material is used to form the second cladding and the flattening layer of the intermediate pressure sensor.

[0096] In this embodiment, the second cladding of the pressure sensor is formed while the flattening layer of the display panel is formed by reusing the flattening layer material, thereby simplifying the manufacturing process and manufacturing cost. Specifically, the transmission optical fiber with the intermediate pressure sensor is attached to the substrate through the adhesive portion, and the second cladding of the pressure sensor is formed while the flattening layer is formed, thereby completing the preparation of the flattening layer and the second cladding in one manufacturing step. The specific implementation of this embodiment refers to the above-mentioned embodiment, which will not be repeated here.

[0097] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A display panel, characterized in that: The invention comprises: a substrate, and at least one transmission optical fiber, a flattening layer and a light-emitting composite layer which are sequentially stacked on the substrate; in The display panel comprises a display area and a non-display area surrounding the display area, wherein the display area comprises a first side and a second side arranged opposite to each other; The transmission optical fiber comprises a plurality of pressure sensors connected in series along the extending direction of the transmission optical fiber, the pressure sensor comprises a core, a first cladding wrapped outside the core, and a second cladding wrapped outside the first cladding, the thickness of the second cladding being greater than the thickness of the first cladding; The transmission optical fiber includes a first end, a second end, and an optical fiber body, wherein the first end receives a first optical signal and the second end outputs a second optical signal, and the optical fiber body includes a first optical fiber sub-body, a second optical fiber sub-body, and a third optical fiber sub-body, the first optical fiber sub-body passes through the display area from a non-display area close to the first edge and extends to a non-display area close to the second edge, the second optical fiber sub-body is located in the non-display area close to the second edge, the third optical fiber sub-body passes through the display area from a non-display area close to the second edge and extends to a non-display area close to the first edge, and the multiple pressure sensors are located in the display area and are arranged on the first optical fiber sub-body and the third optical fiber sub-body.

2. The display panel according to claim 1, characterized in that: The plurality of pressure sensors include a plurality of first pressure sensors disposed on the first optical fiber sub-body, and second pressure sensors disposed on the third optical fiber sub-body and corresponding one-to-one to the first pressure sensors.

3. The display panel according to claim 1, characterized in that: The planarization layer of the display panel is made of the same material as the second cladding layer of the pressure sensor, and the planarization layer and the second cladding layer of the pressure sensor are formed in the same manufacturing step.

4. The display panel according to claim 1, characterized in that: The elastic modulus of the second cladding is smaller than the elastic modulus of the first cladding.

5. The display panel according to any one of claims 1 to 4, characterized in that: The material of the first cladding layer is SiO2, and the thickness of the first cladding layer is greater than or equal to 3 μm and less than or equal to 5 μm; The material of the second cladding layer is SiNx, the thickness of the second cladding layer is greater than or equal to 30 μm and less than or equal to 50 μm, and the length of the second cladding layer is greater than or equal to 2 mm and less than or equal to 4 mm.

6. The display panel according to claim 1, characterized in that: A plurality of adhesive portions are provided on the substrate, the transmission optical fiber is attached to the substrate through the adhesive portions, and the orthographic projection of the adhesive portions on the substrate does not overlap with the orthographic projection of the pressure sensor on the substrate; and / or The light-emitting composite layer includes a driving circuit layer, an organic light-emitting diode light-emitting functional layer and a packaging layer stacked on the planarization layer.

7. A display device, characterized in that: The invention comprises a processor, an optical module, and a display panel as claimed in any one of claims 1 to 6, wherein The optical module is used to output a first optical signal to a transmission optical fiber of the display panel, and to obtain a light intensity signal according to a second optical signal output by the transmission optical fiber; The processor is used for obtaining the pressure borne by the display panel according to the light intensity signal.

8. The display device according to claim 7, characterized in that: The optical module includes a broadband light source and an optical signal processing unit, wherein: The broadband light source is used to generate broadband light as the first optical signal and transmit it to one end of the transmission optical fiber; The optical signal processing unit is connected to the other end of the transmission optical fiber and is used for converting the second optical signal output by the transmission optical fiber into an electrical signal to obtain the light intensity signal of the second optical signal.

9. A pressure detection method using the display device according to claim 7 or 8, characterized in that: include: The optical module of the display device outputs a first optical signal to a transmission optical fiber of the display panel; The optical module receives the second optical signal output by the transmission optical fiber to obtain a light intensity signal; The processor of the display device obtains the pressure borne by the display panel according to the light intensity signal.

10. The pressure detection method according to claim 9, characterized in that: Also includes: In response to the pressure on the display panel being greater than or equal to a preset pressure threshold, preset pressure alarm information is presented on the display panel.

11. A method for manufacturing a display panel according to any one of claims 1 to 6, characterized in that: include: Etching the position of the pressure sensor to be formed on the transmission optical fiber to form an intermediate pressure sensor having a core and a first cladding; encapsulating the intermediate pressure sensor with a second encapsulation material to form a pressure sensor having a second encapsulation; attaching the transmission optical fiber to a substrate; forming a planarization layer covering the transmission optical fiber and the substrate; A light emitting composite layer is formed on the planarization layer.

12. The manufacturing method according to claim 11, characterized in that: The step of coating the intermediate pressure sensor with a second cladding material to form a pressure sensor having a second cladding, attaching the transmission optical fiber to a substrate, and forming a planarization layer covering the transmission optical fiber and the substrate further comprises: attaching a transmission optical fiber including the intermediate pressure sensor to the substrate; A second cladding layer and a planarization layer of the intermediate pressure sensor are formed using a planarization layer material.

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