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

Abstract

The present invention discloses a display panel, a display device, a pressure detection method, and a manufacturing method, wherein the display panel of one embodiment includes: a substrate, and at least one transmission optical fiber, a flattening layer, and a light-emitting composite layer sequentially stacked on the substrate; wherein the display panel includes a display area and a non-display area; the transmission optical fiber includes a plurality of pressure sensors connected in series along the extension direction of the transmission optical fiber, the pressure sensor including a core, a first cladding wrapped around the outside of the core, and a second cladding wrapped around the outside of the first cladding, the thickness of the second cladding being greater than the thickness of the first cladding, the transmission optical fiber receiving a first optical signal, extending and arranging between the non-display area and the display area, and outputting a second optical signal. The embodiment provided by the present invention has practical application value by forming a pressure sensor with a double cladding on the transmission optical fiber, and arranging the transmission optical fiber in the display panel, and utilizing the pressure sensor to respond to the deformation of the display panel under pressure.

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 a vital position in various fields of engineering and life. In the early days of display technology, the mainstream display technology was the cathode ray tube (CRT). Currently, common display technologies include liquid crystal display (LCD) and organic light-emitting diode (OLED). OLED display technology is gradually replacing LCD in the market. Compared with traditional CRT and LCD display technologies, it has significant advantages, such as fast response speed, high color contrast, thin and light structure, flexibility, and wide viewing angle.

[0003] However, in actual applications, it has been 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 includes a display area and a non-display area surrounding the display area, and the display area includes a first side and a second side that are oppositely arranged;

[0006] The transmission optical fiber includes a plurality of pressure sensors connected in series along an extension direction of the transmission optical fiber, the pressure sensor including a core, a first cladding wrapped around the outside of the core, and a second cladding wrapped around the outside of the first cladding, wherein the thickness of the second cladding is 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 the non-display area close to the first side and extends to the non-display area close to the second side, the second optical fiber sub-body is located in the non-display area close to the second side, the third optical fiber sub-body passes through the display area from the non-display area close to the second side and extends to the non-display area close to the first side, 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 multiple pressure sensors include multiple first pressure sensors arranged on the first optical fiber sub-body, and second pressure sensors arranged 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 obtain a light intensity signal according to a second optical signal output by the transmission optical fiber;

[0018] The processor is configured to obtain 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 the broadband light 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 to convert 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] cladding the intermediate pressure sensor with a second cladding material to form a pressure sensor having a second cladding;

[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 steps of cladding 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 include:

[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 response to 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 based on the second optical signal output by the transmission optical fiber. The processor of the display device obtains the pressure borne by the display panel based on the light intensity signal, thereby realizing the detection of the pressure borne by 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 structural diagram of a display panel according to an embodiment of the present invention is shown;

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

[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 structural diagram 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 of a display panel according to an embodiment of the present invention is shown;

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

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

[0048] Figure 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 following detailed description 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…” 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” means that two layers, parts, components, elements or parts can be formed by the same patterning process, and that 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 the 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 . The display area 302 includes a first side 3021 and a second side 3022 that are oppositely disposed.

[0053] The transmission optical fiber 11 includes a plurality of pressure sensors 12 connected in series along the extension direction of the transmission optical fiber 11. 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. 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 the non-display area near the first edge 3021 and extends to the non-display area near the second edge 3022. The second optical fiber sub-body 114 is located in the non-display area near the second edge 3022. The third optical fiber sub-body 115 passes through the display area 302 from the non-display area near the second edge 3022 and extends to the non-display area near 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 double-clad pressure sensor 12 on a transmission optical fiber 11, and the transmission optical fiber 11 is disposed within the display panel. The thickness of the second cladding is greater than the thickness of the first cladding 122, making the pressure sensor 12 more sensitive to the external stress or pressure applied to the display panel, resulting in a larger deformation. As a result, the optical signal transmitted by the transmission optical fiber 11 partially leaks at the core 121 of the pressure sensor 12, causing the intensity of the transmitted optical signal to change, thereby achieving detection of the external stress or pressure applied to the display panel. That is, this embodiment utilizes the pressure sensor disposed within the display panel to deform in response to the pressure applied to the display panel, causing the intensity of the optical signal transmitted by the transmission optical fiber to change to achieve pressure detection, thereby remedying the problems existing in the prior art.

[0056] In a specific embodiment, Figure 2The display device shown includes the display panel of the above embodiment, 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 based on the 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 based on 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 that of the first cladding 122. This makes the pressure sensor more sensitive, more accurate, and more stable. In a specific example, 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 3 μm and less than or equal to 5 μm, the material of the second cladding 123 is SiNx, the thickness T2 of the second cladding 123 is greater than or equal to 30 μm and less than or equal to 50 μm, and the length L of the second cladding 123 is greater than or equal to 2 mm and less than or equal to 4 mm, that is, the length of the pressure sensor is greater than or equal to 2 mm and less than or equal to 4 mm.

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

[0058] In the first step, a position where a pressure sensor is to be formed on the transmission optical fiber is etched 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 micromachining technology. A chemical etching solution, such as HF acid solution, is used to partially dissolve the cladding of the transmission optical fiber 3. The dissolution length is controlled to be greater than or equal to 2 mm and less than or equal to 4 mm. The thickness of the first cladding covering the fiber core after dissolution is controlled to be greater than or equal to 3 μm and less than or equal to 5 μm. In other words, by etching the transmission optical fiber at the location where the pressure sensor is to be formed, an intermediate pressure sensor of a certain length, comprising the fiber 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, a second cladding material is used to coat the intermediate pressure sensor 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 applied to the display panel and undergoes a greater deformation in response to the pressure applied to the display panel. As a result, the optical signal transmitted by the transmission optical fiber partially leaks at the core position of the pressure sensor, resulting in a change in the light intensity of the transmitted optical signal, thereby enabling detection of the external stress or pressure applied to the display panel.

[0062] In an optional embodiment, the second cladding 123 uses a material with an elastic modulus smaller than that of 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, such as Figure 2 As shown, the display panel 300 includes a display area 302 and a non-display area 301 surrounding the display area 302. The display area 302 includes a first side 3021 and a second side 3022 that are opposite to each other, and a third side 3023 and a fourth side 3024 that are opposite to each other.

[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 the first optical signal transmitted by the optical module 200, and the second end 112 outputs the 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 the non-display area near the first edge 3021 and extends to the non-display area near the second edge 3022. The second optical fiber sub-body 114 is located in the non-display area near the second edge 3022. The third optical fiber sub-body 115 passes through the display area 302 from the non-display area near the second edge 3022 and extends to the non-display area near 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 fibers. Those skilled in the art should understand that when the number of transmission optical fibers set is greater and the number of pressure sensors set is greater, 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 ability to detect the pressure on the display panel as the design principle, which will not be elaborated here.

[0066] To further improve the accuracy of pressure detection, in an optional embodiment, as 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 the transmission optical fiber. For example, the first pressure sensor 12A and the second pressure sensor 12B are arranged in pairs and symmetrically, and for example, the first pressure sensor 12C and the 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 the first optical signal input from the first end 111 of the transmission optical fiber and the second optical signal output from the second end 112, and further obtain the pressure exerted on the display panel through the processor, and obtain the position where the display panel is subjected to pressure according to a preset pressure position evaluation method, so that users 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, multiple adhesive portions 303 are provided on the substrate 10 of the display panel. The transmission optical fiber 11 is attached to the substrate 10 via the adhesive portions 303. The orthographic projections of the adhesive portions 303 on the substrate 10 do not overlap with the orthographic projections of the pressure sensors 12A, 12B, 12C, and 12D on the substrate 10. In other words, the transmission optical fiber of this embodiment is fixed inside the display panel via the adhesive portions without affecting the sensing sensitivity of the pressure sensors.

[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, forming the planarization layer 13 before forming the light emitting composite layer 14 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 an encapsulation 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 display area 302 includes the transmission optical fiber 11 and the pressure sensor 12. 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 an external force. The pressure sensor 12 arranged inside the display panel senses the external force and deforms, causing the leakage of the optical signal transmitted by the fiber core of the pressure sensor 12, thereby changing the light intensity of the optical signal and realizing the detection of the pressure borne by the display panel.

[0074] This completes the fabrication of the display panel of this embodiment. This embodiment utilizes a double-clad pressure sensor formed on a transmission optical fiber, which is then positioned within the display panel. The pressure sensor responds to the deformation of the display panel under pressure, causing a change in the intensity of the optical signal transmitted by the transmission optical fiber to detect pressure.

[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 flattening layer material is used to form the second cladding and flattening layer of the intermediate pressure sensor.

[0076] In this embodiment, the flattening layer material is reused to simultaneously form the second cladding layer of the pressure sensor while forming the flattening layer of the display panel, thereby simplifying the manufacturing process and production costs. Specifically, the transmission optical fiber with the intermediate pressure sensor is attached to the substrate via an adhesive portion, and the second cladding layer of the pressure sensor is simultaneously formed during the flattening layer formation process, thereby completing the preparation of the flattening layer and the second cladding layer in a single manufacturing step. The flattening layer of the display panel and the second cladding layer of the pressure sensor are made of the same material, and the flattening layer and the second cladding layer of the pressure sensor are formed in the same manufacturing step. Specifically, for example, the flattening layer material is SiNx, and the elastic modulus of the flattening layer material is lower than that of the first cladding layer of the pressure sensor, thereby forming a pressure sensor with a double cladding layer and higher sensitivity.

[0077] Based on the display panel of the above 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 the transmission optical fiber 11 of the display panel 300, and obtain a light intensity signal based on the 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 based on the light intensity signal.

[0078] In this embodiment, the external pressure exerted on the display panel is sensed by a transmission optical fiber provided inside the display panel and including a pressure sensor having a double cladding. The optical module of the display device provides a first optical signal to the transmission optical fiber. The pressure sensor is utilized to respond to the deformation of the display panel caused by the pressure exerted thereon, 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. The processor of the display device obtains the pressure exerted on the display panel based on the light intensity signal, thereby realizing the detection of the pressure exerted 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 broadband light source is used to generate a first optical signal transmitted by a transmission optical fiber, 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. The optical signal processing unit performs optical processing on the second optical signal output by the transmission optical fiber 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 exerted on the display panel.

[0081] Based on the display device of the above embodiment, Figure 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, by generating a broad-spectrum light source in the optical module as a first optical signal and outputting it to a transmission optical fiber. The first optical signal is then output to an optical signal processing unit of the optical module through multiple pressure sensors on the transmission optical fiber. The optical signal processing unit then converts the second optical signal and obtains a light intensity signal. Finally, the processor obtains the pressure to which the display panel is subjected based on 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 through the multiple pressure sensors in the transmission optical fiber is substantially the same as the light intensity of the first optical signal input to the transmission optical fiber, for example, the difference in light intensity 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 through the multiple pressure sensors in the transmission optical fiber is significantly different from the light intensity of the first optical signal input to the transmission optical fiber, for example, the difference in light intensity between the two is greater than the fluctuation range. The external pressure to which the display device is subjected can be obtained based on the light intensity difference.

[0086] To further prevent the display device from being permanently damaged 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 determined 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 above embodiment, Figure 5 As shown, one embodiment of the present invention provides a method for manufacturing the aforementioned 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] cladding the intermediate pressure sensor with a second cladding material to form a pressure sensor having a second cladding;

[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 double-clad pressure sensor based on a transmission optical fiber is incorporated into the display panel during its fabrication process. The transmission optical fiber is then positioned within the display panel. The pressure sensor responds to the deformation of the display panel under pressure, causing a change in the intensity of the optical signal transmitted by the transmission optical fiber to achieve pressure detection. The display panel of this embodiment has a pressure detection function without affecting its display function. For detailed implementation, see the previous embodiment and 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 flattening layer material is reused to simultaneously form the display panel's flattening layer and the pressure sensor's second cladding, simplifying the manufacturing process and reducing costs. Specifically, the transmission optical fiber with the intermediate pressure sensor is attached to a substrate via an adhesive assembly. The flattening layer is formed simultaneously with the second cladding, completing the fabrication of both layers in a single step. The detailed implementation of this embodiment is described in the previous embodiment and 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 scope of protection 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 sequentially stacked on the substrate; in The display panel includes a display area and a non-display area surrounding the display area, and the display area includes a first side and a second side that are oppositely arranged; The transmission optical fiber includes a plurality of pressure sensors connected in series along an extension direction of the transmission optical fiber, the pressure sensor including a core, a first cladding wrapped around the outside of the core, and a second cladding wrapped around the outside of the first cladding, wherein the thickness of the second cladding is 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 the non-display area close to the first side and extends to the non-display area close to the second side, the second optical fiber sub-body is located in the non-display area close to the second side, the third optical fiber sub-body passes through the display area from the non-display area close to the second side and extends to the non-display area close to the first side, 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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 projections of the adhesive portions on the substrate do not overlap with the orthographic projections 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 an encapsulation layer stacked on the planarization layer.

7. A display device, characterized in that: comprising 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 obtain a light intensity signal according to a second optical signal output by the transmission optical fiber; The processor is configured to obtain the pressure borne by the display panel according to the light intensity signal.

8. The display device according to claim 7, wherein: 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 the broadband light 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 to convert 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; cladding 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; 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 cladding 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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