A stretchable light-emitting device and a method for preparing the same

Abstract

The present invention discloses a stretchable light-emitting device and a preparation method thereof. The stretchable light-emitting device comprises: a stretchable substrate and a flexible light-emitting panel, wherein the stretchable substrate is arranged on the non-light-emitting side of the flexible light-emitting panel; the flexible light-emitting panel comprises a plurality of light-emitting areas and a non-light-emitting area, and a support sheet is arranged between each light-emitting area and the stretchable substrate; the support sheet is connected to the flexible light-emitting panel and the stretchable substrate through an adhesive layer, and the non-light-emitting area is connected to the stretchable substrate through an adhesive layer; the non-light-emitting area between adjacent light-emitting areas comprises a plurality of hollow areas, and the hollow areas penetrate the flexible light-emitting panel; the non-light-emitting area of ​​the flexible light-emitting panel and the stretchable substrate connected to the non-light-emitting area have bending wrinkles. The embodiment of the present invention has less changes compared to the traditional flexible screen process, and the flexible light-emitting panel can be manufactured using the preparation process of the traditional flexible display screen, which can reduce the process cost and has high mass production.

Description

Technical Field

[0001] The present invention relates to the field of organic light-emitting technology, and in particular to a stretchable light-emitting device and a preparation method thereof. Background Art

[0002] Flexible organic light-emitting diode (OLED) panels have become the key to the innovation of display technology for medical photomedicine due to their unique characteristics, such as flexibility, lightness and adaptability. Compared with traditional display screens, medical photomedicine OLED devices have higher requirements for light transmittance, uniformity of light emission and ultra-thin structure.

[0003] Photomedical technology, as an intersection of modern medicine and optical technology, has shown great potential in clinical treatment and health management in recent years. In modern medicine, the application scope of photomedical technology continues to expand. From dermatology to ophthalmology, from tumor treatment to wound healing, various phototherapies are emerging with each passing day. Among them, low-intensity laser therapy (LLLT) and photodynamic therapy (PDT) are important components of photomedical technology. These therapies usually use light of different wavelengths to excite molecules in biological tissues, inducing a series of biological effects, such as promoting cell proliferation, enhancing immune response, reducing inflammation or destroying pathogens. OLED light sources are widely used in adhesive phototherapy devices due to their soft and bendable properties. Traditional flexible OLED screens use polyimide as a flexible substrate, which can achieve one-dimensional bending and is difficult to adapt to the wearable requirements of photomedical devices. Stretchability has become an inevitable requirement for wearable photomedical OLED devices. Summary of the invention

[0004] The embodiment of the present invention provides a stretchable light-emitting device and a preparation method thereof. The embodiment of the present invention has fewer changes compared to the traditional flexible screen process. The flexible light-emitting panel can be manufactured using the preparation process of the traditional flexible display screen, which can reduce the process cost and has high mass producibility.

[0005] According to one aspect of the present invention, there is provided a stretchable light-emitting device, comprising:

[0006] A stretchable substrate and a flexible light-emitting panel, wherein the stretchable substrate is arranged on the non-light-emitting side of the flexible light-emitting panel;

[0007] The flexible light-emitting panel includes a plurality of light-emitting areas and a non-light-emitting area, and a support sheet is provided between each of the light-emitting areas and the stretchable substrate; the support sheet is connected to the flexible light-emitting panel and the stretchable substrate through an adhesive layer, and the non-light-emitting area is connected to the stretchable substrate through an adhesive layer; the non-light-emitting area between adjacent light-emitting areas includes a plurality of hollow areas, and the hollow areas penetrate the flexible light-emitting panel;

[0008] The non-luminous area of ​​the flexible luminous panel and the stretchable substrate connected to the non-luminous area have bending wrinkles.

[0009] Optionally, the flexible light-emitting panel comprises a flexible substrate and a plurality of light-emitting structures which are stacked in sequence; the flexible substrate is arranged on a side of the light-emitting structure adjacent to the stretchable substrate; the light-emitting structure is located in the light-emitting area;

[0010] The non-luminous area includes a lead area; in the lead area, an electrode trace is provided on a side of the flexible substrate adjacent to the light-emitting structure, each of the electrode traces is electrically connected to one of the light-emitting structures; the electrode traces are used to transmit a driving signal to the light-emitting structure;

[0011] A clearance area is arranged between adjacent lead areas, and the hollow area is arranged in the clearance area; and a distance between an edge of the hollow area and an edge of the clearance area is greater than zero.

[0012] Optionally, each of the light-emitting areas is correspondingly provided with a packaging effective area and a strain barrier area; the packaging effective area and the strain barrier area are both arranged around the light-emitting area, and the strain barrier area is arranged on a side of the packaging effective area away from the light-emitting area, and the hollow area is arranged on a side of the strain barrier area away from the light-emitting area;

[0013] The flexible light-emitting panel comprises a flexible substrate, a plurality of light-emitting structures and an encapsulation layer which are stacked in sequence; the flexible substrate is arranged on a side of the light-emitting structure adjacent to the stretchable substrate; the light-emitting structure is located in the light-emitting area;

[0014] In the encapsulation effective area, at least one first dam is disposed on a side of the flexible substrate adjacent to the light emitting structure, and the first dam surrounds the light emitting area; the encapsulation layer includes an organic layer and an inorganic layer, and the first dam is used to block the organic layer; the inorganic layer extends to the encapsulation effective area and covers the first dam;

[0015] In the strain barrier region, at least one second dam and at least one strain barrier groove are disposed on a side of the flexible substrate away from the stretchable substrate, and both the second dam and the strain barrier groove surround the packaging active region.

[0016] Optionally, vertical projections of the second dam and the strain barrier groove on the flexible substrate are both closed rings;

[0017] Alternatively, each of the second dams includes a plurality of sub-dams, and each of the strain blocking grooves includes a plurality of sub-grooves; a plurality of sub-dams are arranged around the light-emitting area, and a plurality of sub-grooves are arranged around the light-emitting area, and along the direction surrounding the light-emitting area, the sub-dams in different second dams are staggered, and the sub-grooves in different strain blocking grooves are staggered.

[0018] Optionally, a vertical projection of the second dam on the flexible substrate includes at least one of a straight line, a broken line and a curve;

[0019] A vertical projection of the strain barrier groove on the flexible substrate includes at least one of a straight line, a broken line and a curved line.

[0020] Optionally, the strain barrier groove has a depth of 3-5 μm in the flexible substrate, and a height of the second dam is 2-6 μm;

[0021] Along the direction from the light emitting area to the strain barrier area, the widths of the strain barrier groove and the second dam are both 30-60 um.

[0022] Optionally, the flexible light-emitting panel further includes at least one insulating layer, wherein the insulating layer is disposed between the flexible substrate and the light-emitting structure; the first dam includes at least one of the insulating layers, and the second dam includes at least one of the insulating layers.

[0023] Optionally, the stretchable substrate further comprises a plurality of air holes, at least part of which are located in the hollow area in the vertical projection of the flexible light-emitting panel, or the stretchable substrate is made of a microporous structure material;

[0024] The vertical projection of the support sheet on the flexible light-emitting panel covers the light-emitting area, and the ratio of the area of ​​the support sheet to the area of ​​the light-emitting area is less than or equal to 1.1.

[0025] Optionally, the material used for the stretchable substrate includes silicone rubber or polyurethane;

[0026] The material used for the support sheet includes at least one of polyethylene terephthalate (PET) and polycarbonate (PC);

[0027] The material of the flexible substrate includes polyimide.

[0028] According to another aspect of the present invention, a method for manufacturing a stretchable light-emitting device is provided, comprising:

[0029] Prepare a flexible light-emitting panel; wherein the flexible light-emitting panel comprises a plurality of light-emitting areas and a non-light-emitting area, the non-light-emitting area between adjacent light-emitting areas comprises a plurality of hollow areas, and the hollow areas penetrate the flexible light-emitting panel;

[0030] pre-stretching the stretchable substrate;

[0031] The flexible light-emitting panel is fixedly arranged on the surface of the stretchable substrate; wherein the stretchable substrate is arranged on the non-light-emitting side of the flexible light-emitting panel; a support sheet is arranged between each of the light-emitting areas and the stretchable substrate; the support sheet is connected to the flexible light-emitting panel and the stretchable substrate through an adhesive layer, and the non-light-emitting area is connected to the stretchable substrate through an adhesive layer;

[0032] The tension on the stretchable substrate is removed, so that the non-luminous area of ​​the flexible light-emitting panel and the stretchable substrate connected to the non-luminous area have bending wrinkles.

[0033] In the stretchable light-emitting device provided by the embodiment of the present invention, a support sheet is arranged between each light-emitting area of ​​the flexible light-emitting panel and the stretchable substrate; the support sheet is connected to the flexible light-emitting panel and the stretchable substrate through an adhesive layer, and the non-light-emitting area is connected to the stretchable substrate through an adhesive layer; the non-light-emitting area between adjacent light-emitting areas includes a plurality of hollow areas, and the hollow areas penetrate the flexible light-emitting panel; the non-light-emitting area of ​​the flexible light-emitting panel and the stretchable substrate connected to the non-light-emitting area have bending wrinkles. The flexible light-emitting panel of the embodiment of the present invention is provided with a hollow structure in the non-light-emitting area, and by arranging the flexible light-emitting panel on the stretchable substrate, and arranging the support sheet on the light-emitting area and the stretchable substrate, under the premise of ensuring that the light-emitting area is relatively flat, the non-light-emitting area has bending wrinkles, so that the stretchable light-emitting device has stretchable and compressible properties, and meets the wearable requirements. Compared with the traditional flexible screen, this embodiment only needs to set a hollow area in the non-light-emitting area, and the process changes are less. The flexible light-emitting panel can be made by the preparation process of the traditional flexible display screen, which can reduce the process cost and has high mass production.

[0034] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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.

[0036] Figure 1 It is a schematic diagram of a stretched light-emitting device in a stretched state provided by an embodiment of the present invention.

[0037] Figure 2 This is a side view of a stretchable light-emitting device in a stretched state provided by an embodiment of the present invention.

[0038] Figure 3 It is a side view of a stretchable light-emitting device in an unstretched state provided by an embodiment of the present invention.

[0039] Figure 4 It is a schematic diagram of a compressed state of a stretchable light-emitting device provided by an embodiment of the present invention.

[0040] Figure 5 It is a partially enlarged view of a stretchable light-emitting device provided in an embodiment of the present invention.

[0041] Figure 6 yes Figure 5 A cross-sectional view of the light emitting device along section line AA.

[0042] Figure 7 yes Figure 5 A partial enlarged view of the light-emitting device in the figure.

[0043] Figure 8 yes Figure 5 Another partial enlarged view of the light-emitting device.

[0044] Fig. 9 yes Figure 5 Another partial enlarged view of the light-emitting device.

[0045] Fig.10 This is a schematic diagram of a stretched state of another stretchable light-emitting device provided by an embodiment of the present invention.

[0046] Fig.11 It is a flow chart of a method for manufacturing a stretchable light-emitting device provided in an embodiment of the present invention.

[0047] Fig.12 It is a schematic diagram of a process for preparing a flexible light-emitting panel provided in an embodiment of the present invention.

[0048] Fig.13 is a schematic diagram of a flexible light-emitting device in a stretched state. DETAILED DESCRIPTION

[0049] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0050] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0051] At present, stretchable OLED display screens mainly adopt island-bridge structure or pleated structure. The island-bridge structure requires the preparation of an interconnected bridge with stretchable properties around the silicon-based or glass-based pixel unit. The pleated structure mostly prepares the OLED panel on an ultra-thin film elastic substrate and then transfers it to a pre-stretched elastic substrate. Both structures are very different from the current mainstream flexible OLED screen production route, cannot be adapted to the flexible OLED production line, and have low mass producibility.

[0052] An embodiment of the present invention provides a stretchable light-emitting device, Figure 1 is a schematic diagram of a stretchable light-emitting device in a stretched state provided by an embodiment of the present invention, Figure 2 is a side view of a stretchable light-emitting device in a stretched state provided by an embodiment of the present invention, Figure 3 1 is a side view of a stretchable light-emitting device in an unstretched state provided by an embodiment of the present invention. Figure 1-Figure 3 , the stretchable light-emitting device comprises:

[0053] A stretchable substrate 10 and a flexible light-emitting panel 20, wherein the stretchable substrate 10 is disposed on the non-light-emitting side of the flexible light-emitting panel 20;

[0054] The flexible light-emitting panel 20 includes a plurality of light-emitting areas 21 and a non-light-emitting area 22, and a support sheet 30 is provided between each light-emitting area 21 and the stretchable substrate 10; the support sheet 30 is connected to the flexible light-emitting panel 20 and the stretchable substrate 10 through an adhesive layer 40, and the non-light-emitting area 22 is connected to the stretchable substrate 10 through an adhesive layer 40; the non-light-emitting area 22 between adjacent light-emitting areas 21 includes a plurality of hollow areas 221, and the hollow areas 221 penetrate the flexible light-emitting panel 20;

[0055] The non-luminous area 22 of the flexible luminous panel 20 and the stretchable substrate 10 connected to the non-luminous area 22 have bending wrinkles.

[0056] The stretchable substrate 10 is a flexible substrate that can be deformed under the action of a force, and can restore its original shape after the force is removed. For example, after a tensile force is applied to the stretchable substrate 10, the area of ​​the stretchable substrate 10 becomes larger, and after the tensile force is removed, it can restore to its original size; after an extrusion force is applied to the stretchable substrate 10, the stretchable substrate 10 bends, and after the extrusion force is removed, it can restore to its original size. The stretchable substrate 10 can be made of materials such as silicone rubber or polyurethane.

[0057] The flexible light-emitting panel 20 includes a plurality of light-emitting areas 21, and the non-light-emitting areas 22 are between the plurality of light-emitting areas 21 and the border area of ​​the flexible light-emitting panel 20. The plurality of light-emitting areas 21 can be arranged in an array, and each light-emitting area 21 can be individually controlled to emit light. For example, a lead can be provided in the non-light-emitting area 22, each light-emitting area 21 is connected to a separate lead, and a driving signal is transmitted to the light-emitting area 21 through the lead, so as to realize the individual control of the light-emitting area 21. The hollow area 221 can be provided between adjacent leads, and by providing the hollow area 221, the non-light-emitting area 22 of the flexible light-emitting panel 20 is more likely to deform. The support sheet 30 has a certain hardness and can maintain the shape of the light-emitting area 21. For example, the material of the support sheet 30 can be PET or PC, etc.

[0058] Specifically, when making a stretchable light-emitting device, after the flexible light-emitting panel 20 is prepared, the stretchable substrate 10 is pre-stretched in four axes, and the flexible light-emitting panel 20 is adhered to the stretchable substrate 10. The light-emitting area 21 is bonded to the stretchable substrate 10 through the support sheet 30 and the adhesive layer 40. The non-light-emitting area 22 is bonded to the stretchable substrate 10 through the adhesive layer 40. The pre-tension of the stretchable substrate 10 is removed, the stretchable substrate 10 shrinks, and the flexible light-emitting panel 20 shrinks with the stretchable substrate 10. The flexible light-emitting panel 20 forms wrinkles under the action of the resilience of the stretchable substrate 10. Since the flexible light-emitting panel 20 has a hollow area 221, the resilience is preferentially released in the hollow area 221, and the wrinkle degree of the non-light-emitting area 22 is greater than the wrinkle degree of the light-emitting area 21, so that the resilience is preferentially released in the non-light-emitting area 22 and the hollow area 221, ensuring the relative flatness of the light-emitting area 21, and the supporting effect of the support sheet 30 further ensures the relative flatness of the light-emitting area 211.

[0059] By controlling the stretching ratio of the stretchable substrate 10 and combining the supporting effect of the support sheet 30 on the light-emitting area 21, the non-light-emitting area 22 is wrinkled after the pre-stretching force is removed, so that the stretchable light-emitting device is both stretchable and compressible. The state of the stretchable light-emitting device after the pre-stretching force is removed is called the initial state. Figure 3 It is a schematic diagram of an initial state, in which the stretchable light-emitting device is both stretchable and compressible. Figure 2Schematic diagram of a stretchable light-emitting device before the stretching force is removed, i.e. Figure 2 Schematic diagram of the stretched light-emitting device in the stretched state. Figure 4 is a schematic diagram of a compressed state of a stretchable light-emitting device provided by an embodiment of the present invention, with reference to Figure 4 ,right Figure 3 The stretchable light-emitting device in the initial state is compressed to obtain a stretchable light-emitting device in a compressed state. Since the stretchable light-emitting device is both stretchable and compressible, it can be suitable for wearable applications of optical medical equipment, such as phototherapy applications for elbow joints and knee joints. It should be noted that Figure 3 and Figure 4 The adhesive layer is not shown in the figure, which is not a limitation of the present invention.

[0060] In the stretchable light-emitting device provided by an embodiment of the present invention, a supporting sheet 30 is arranged between each light-emitting area 21 of the flexible light-emitting panel 20 and the stretchable substrate 10; the supporting sheet 30 is connected to the flexible light-emitting panel 20 and the stretchable substrate 10 through an adhesive layer 40, and the non-light-emitting area 22 is connected to the stretchable substrate 10 through an adhesive layer 40; the non-light-emitting area 22 between adjacent light-emitting areas 21 includes a plurality of hollow areas 221, and the hollow areas 221 penetrate the flexible light-emitting panel 20; the non-light-emitting area 22 of the flexible light-emitting panel 20 and the stretchable substrate 10 connected to the non-light-emitting area 22 have bending wrinkles. The flexible light-emitting panel of the embodiment of the present invention is provided with a hollow structure in the non-luminous area 22, and by providing the flexible light-emitting panel 20 on the stretchable substrate 10, and providing a supporting sheet 30 on the light-emitting area 21 and the stretchable substrate 10, while ensuring that the light-emitting area 21 is relatively flat, the non-luminous area 22 has bending wrinkles, so that the stretchable light-emitting device has stretchable and compressible properties to meet wearable requirements. Compared with the traditional flexible screen, this embodiment only needs to provide a hollow area 221 in the non-luminous area 22, and the process changes are relatively small. The flexible light-emitting panel 20 can be manufactured using the preparation process of traditional flexible display screens, which can reduce the process cost and has high mass producibility.

[0061] Based on the above embodiment, optionally, refer to Figure 1-Figure 3 The flexible light-emitting panel 20 includes a flexible substrate 201 and a plurality of light-emitting structures 202 which are stacked in sequence; the flexible substrate 201 is disposed on a side of the light-emitting structure 202 adjacent to the stretchable substrate 10; and the light-emitting structure 202 is located in the light-emitting area 21;

[0062] The non-luminous area 22 includes a lead area 222; in the lead area 222, an electrode trace is provided on one side of the flexible substrate 201 adjacent to the light emitting structure 202, and each electrode trace is electrically connected to a light emitting structure 202; the electrode trace is used to transmit a driving signal to the light emitting structure 202;

[0063] A clearance area 223 is disposed between adjacent lead areas 222 , and the hollow area 221 is disposed in the clearance area 223 ; a distance between an edge of the hollow area 221 and an edge of the clearance area 223 is greater than zero.

[0064] The electrode wiring is arranged in the lead area 222, and the electrode wiring extends along the lead area 222 to the binding area, and is electrically connected to the external pins in the binding area, and the external pins are used to bind and connect with the external circuit to receive the driving signal transmitted by the external circuit. In addition, an auxiliary electrode can also be arranged in the lead area 222, and the light-emitting structure 202 is electrically connected to the electrode wiring 222 through the auxiliary electrode, and the auxiliary electrode is used to adjust the size of the driving signal, reduce the difference in light-emitting brightness between different light-emitting areas 21, and improve the light-emitting uniformity of the light-emitting device. Figure 1 The lead area 222 is shown only as an example, which is not a limitation of the present invention. The specific size and position of the lead area 22 can be determined according to the number and arrangement of the electrode traces.

[0065] The clearance area 223 is not provided with other structures such as electrode routing, and the electrode routing is concentrated in the lead area 222 on both sides of the clearance area 223. One, two or more clearance areas 223 can be set between adjacent light-emitting areas 21, and the size and number of the clearance areas 223 can be set according to the number and arrangement of electrode routings between two adjacent light-emitting areas 21. Since there are fewer electrode routings, the width of the electrode routing is 60-150um, and the smaller width is easy to realize centralized design. Therefore, by concentrating the electrode routings in the lead area 222, a larger clearance area 223 is provided in the non-light-emitting area 22, and a larger hollow area 221 can be provided, so that the non-light-emitting area 22 has higher flexibility and is easier to bend.

[0066] In addition, by setting the distance between the edge of the hollow area 221 and the edge of the clearance area 223 to be greater than zero, that is, a portion of the flexible substrate 201 is retained at the edge of the electrode routing, the retained flexible substrate 201 can cope with stress release, forming an island bridge-like grid structure, which can avoid dead bends in the electrode routing, etc., improve the bending resistance of the non-luminous area 22, and ensure that the stretchable light-emitting device has a longer service life.

[0067] Figure 5 is a partial enlarged view of a stretchable light-emitting device provided by an embodiment of the present invention, Figure 6 yes Figure 5 The cross-sectional view of the light emitting device along the section line AA, based on the above embodiment, optionally, refer to Figure 5 and Figure 6, each light-emitting area 21 is correspondingly provided with a packaging effective area 23 and a strain barrier area 24; the packaging effective area 23 and the strain barrier area 24 are both arranged around the light-emitting area 21, and the strain barrier area 24 is arranged on a side of the packaging effective area 23 away from the light-emitting area 21, and the hollow area 221 is arranged on a side of the strain barrier area 24 away from the light-emitting area 21;

[0068] The flexible light-emitting panel includes a flexible substrate 201, a plurality of light-emitting structures 202 and an encapsulation layer 203 which are stacked in sequence; the flexible substrate 201 is arranged on a side of the light-emitting structure 202 adjacent to the stretchable substrate 10; the light-emitting structure 202 is located in the light-emitting area 21;

[0069] In the encapsulation effective area 23, at least one first dam 50 is disposed on one side of the flexible substrate 201 adjacent to the light emitting structure 202, and the first dam 50 surrounds the light emitting area 21; the encapsulation layer 203 includes an organic layer 61 and an inorganic layer 62, and the first dam 50 is used to block the organic layer 61; the inorganic layer 62 extends to the encapsulation effective area 23 and covers the first dam 50;

[0070] In the strain barrier region 24 , at least one second dam 60 and at least one strain barrier groove 70 are disposed on a side of the flexible substrate 201 away from the stretchable substrate 10 . Both the second dam 60 and the strain barrier groove 70 surround the package active region 23 .

[0071] Among them, the encapsulation effective area 23 and the strain barrier area 24 are both located in the non-luminous area 22, the encapsulation effective area 23 is arranged adjacent to the luminous area 21, and the strain barrier area 24 is arranged adjacent to the encapsulation effective area 23. The encapsulation layer 203 may include at least two inorganic layers 62 and at least one organic layer 61, and the inorganic layers 62 and the organic layers 61 are alternately stacked. The inorganic layer 62 is used to block water and oxygen, and the organic layer 61 is used to buffer the stress between the inorganic layers 62. The first dam 50 is used to block the organic layer 61 to prevent the organic layer 61 from spreading over a larger range and causing the non-luminous area 22 to be too large. The inorganic layer 62 covers the first dam 50, which can increase the path for water and oxygen to invade, improve the encapsulation effect, and ensure that the inorganic layer 62 can better block water and oxygen. The edge of the inorganic layer 62 can be located in the encapsulation effective area 23, that is, the inorganic layer 62 and the strain barrier area 24 do not overlap. The strain barrier region 24 is used to block the strain when the tensile force of the stretchable substrate 10 is released and the stretchable light-emitting device is released after being stretched, so as to ensure that the strain mainly occurs in the non-light-emitting region 22, reduce the strain in the light-emitting region 21, and ensure the uniformity of light emission and the packaging life of the light-emitting region 21. The strain barrier region 24 may have one, two or more second dams 60, and may have one, two or more strain barrier grooves 70. The second dams 60 and the strain barrier grooves 70 may be alternately arranged in the direction away from the light-emitting region 21.

[0072] Figure 7 yes Figure 5A partial enlarged view of the light-emitting device in the middle. Figure 8 yes Figure 5 Another partial enlarged view of the light emitting device in FIG. 1 , based on the above embodiment, optionally, refer to Figure 5-Figure 8 , the vertical projections of the second dam 60 and the strain barrier groove 70 on the flexible substrate 201 are both closed rings;

[0073] Alternatively, each second dam 60 includes a plurality of sub-dams 601, and each strain blocking groove 70 includes a plurality of sub-grooves 701; the plurality of sub-dams 601 are arranged around the light-emitting area 21, and the plurality of sub-grooves 701 are arranged around the light-emitting area 21, and along the direction surrounding the light-emitting area 21, the sub-dams 601 in different second dams 60 are staggered and the sub-grooves 701 in different strain blocking grooves 70 are staggered.

[0074] Specifically, Figure 7 and Figure 8 Both Figure 5 A partial enlarged view of the light emitting device in the middle dashed frame 100. Figure 7 The second dam 60 and the strain blocking groove 70 can be continuous structures and surround the light emitting area 21, that is, the vertical projections of the second dam 60 and the strain blocking groove 70 on the flexible substrate 201 are both closed rings. By setting the vertical projections of the second dam 60 and the strain blocking groove 70 on the flexible substrate 201 to be closed rings, the second dam 60 and the strain blocking groove 70 can prevent strain in any direction from spreading to the light emitting area 21, so as to ensure the light uniformity and packaging life of the light emitting area 21.

[0075] refer to Figure 8 , the second dam 60 and the strain blocking groove 70 may also be a discontinuous structure. Each second dam 60 includes a plurality of sub-dams 601 spaced along the edge of the light-emitting area 21, and the plurality of sub-dams 601 surround the light-emitting area 21. By setting the sub-dams 601 in different second dams 60 to be staggered, the strain in any direction can be blocked from spreading to the light-emitting area 21 under the common blocking of the sub-dams 601 in different second dams 60, so as to ensure the uniformity of light emission and the package life of the light-emitting area 21. Each strain blocking groove 70 includes a plurality of sub-grooves 701 spaced along the edge of the light-emitting area 21, and the plurality of sub-grooves 701 surround the light-emitting area 21. By setting the sub-grooves 701 in different second dams 60 to be staggered, the strain in any direction can be blocked from spreading to the light-emitting area 21 under the common blocking of the sub-grooves 701 in different strain blocking grooves 70, so as to ensure the uniformity of light emission and the package life of the light-emitting area 21.

[0076] Fig. 9 yes Figure 5 Another partial enlarged view of the light emitting device in FIG. 1 , based on the above embodiment, optionally, refer to Figure 7-Figure 9, a vertical projection of the second dam 60 on the flexible substrate 201 includes at least one of a straight line, a broken line and a curve;

[0077] A vertical projection of the strain barrier groove 70 on the flexible substrate 201 includes at least one of a straight line, a folded line, and a curve.

[0078] Specifically, Fig. 9 for Figure 5 Another partial enlarged view of the light-emitting device in the dotted frame 100. The vertical projection of the second dam 60 on the flexible substrate 201 includes at least one of a straight line, a broken line and a curve. Exemplarily, when the second dam 60 is a closed figure, the vertical projection of the second dam 60 on the flexible substrate 201 includes a straight line, then the vertical projection of the second dam 60 on the flexible substrate 201 can be a polygon with the same shape as the light-emitting area 21, and each side of the polygon is a straight line. For example, when the shape of the light-emitting area 21 is a quadrilateral, the vertical projection of the second dam 60 on the flexible substrate 201 is a quadrilateral. When the second dam 60 is a closed figure, the vertical projection of the second dam 60 on the flexible substrate 201 includes a broken line, then the vertical projection of the second dam 60 on the flexible substrate 201 can be a polygon with the same shape as the light-emitting area 21, and each side of the polygon is a broken line. When the second dam 60 is a closed figure, the vertical projection of the second dam 60 on the flexible substrate 201 includes a curve, and the vertical projection of the second dam 60 on the flexible substrate 201 can be a polygon with each side being a curve, or a circle, etc. When the second dam 60 includes a plurality of sub-dams 601, the vertical projection of each sub-dam 601 on the flexible substrate 201 can be at least one of a straight line, a broken line, and a curve.

[0079] The vertical projection of the strain barrier groove 70 on the flexible substrate 201 includes at least one of a straight line, a broken line, and a curve. Exemplarily, when the strain barrier groove 70 is a closed figure, the vertical projection of the strain barrier groove 70 on the flexible substrate 201 includes a straight line, and the vertical projection of the strain barrier groove 70 on the flexible substrate 201 can be a polygon with the same shape as the light-emitting area 21, and each side of the polygon is a straight line. For example, when the shape of the light-emitting area 21 is a quadrilateral, the vertical projection of the strain barrier groove 70 on the flexible substrate 201 is a quadrilateral. When the strain barrier groove 70 is a closed figure, the vertical projection of the strain barrier groove 70 on the flexible substrate 201 includes a broken line, and the vertical projection of the strain barrier groove 70 on the flexible substrate 201 can be a polygon with the same shape as the light-emitting area 21, and each side of the polygon is a broken line. When the strain barrier groove 70 is a closed figure, the vertical projection of the strain barrier groove 70 on the flexible substrate 201 includes a curved line segment, and the vertical projection of the strain barrier groove 70 on the flexible substrate 201 can be a polygon with each side being a curved line, or a circle or the like. When the vertical projection on the flexible substrate 201 includes a plurality of sub-grooves 701 , the vertical projection of each sub-groove 701 on the flexible substrate 201 may be at least one of a straight line, a folded line, and a curve.

[0080] The preparation process of the second dam 60 and the strain blocking groove 70 of straight lines, broken lines and curves is simple, and can effectively block strain. The vertical projection of the second dam 60 and the strain blocking groove 70 on the flexible substrate 201 includes at least one of a straight line, a broken line and a curve, which can reduce the process difficulty while ensuring better blocking strain, ensuring the luminous uniformity of the light-emitting area 21 and the packaging life.

[0081] Based on the above embodiment, optionally, continue to refer to Figure 6 The depth H2 of the strain barrier groove 70 in the flexible substrate 201 is 3-5 μm, and the height H1 of the second dam 60 is 2-6 μm; along the direction from the light-emitting area 21 to the strain barrier area 24, the width D2 of the strain barrier groove 70 and the width D1 of the second dam 60 are both 30-60 μm.

[0082] Such an arrangement ensures that the strain blocking groove 70 and the second dam 60 can better block strain and can reduce the difficulty of the manufacturing process.

[0083] Specifically, refer to Figure 6, the strain barrier groove 70 has a depth H2 in the flexible substrate 201, that is, the etching depth of the flexible substrate 201. The surface of the flexible substrate 201 may be provided with film layers such as a barrier layer 81 and a buffer layer 82. The barrier layer 81 is used to block water and oxygen, and the buffer layer 82 is used to increase the adhesion between the film layers such as the electrode wiring and the flexible substrate 201 that are subsequently made. The strain barrier groove 70 penetrates the film layers such as the barrier layer 81 and the buffer layer 82 and goes deep into the flexible substrate 201. The second dam 60 is provided on the buffer layer 82.

[0084] Based on the above embodiments, optionally, the flexible light-emitting panel also includes at least one insulating layer 83, which is arranged between the flexible substrate 201 and the light-emitting structure 202; the first dam 50 includes at least one insulating layer 83, and the second dam 60 includes at least one insulating layer 83.

[0085] Specifically, the insulating layer 83 may include a planarization layer, a pixel defining layer, a support column layer and other film layers. A drive circuit layer may be included between the flexible substrate 201 and the light emitting structure 202, and an exemplary electrode routing is arranged on the drive circuit layer. The planarization layer and other film layers are used to planarize the drive circuit layer. The pixel defining layer is arranged around the light emitting structure to define the position of the light emitting structure. The support column layer is arranged on the side of the pixel defining layer away from the flexible substrate 201, and the support column layer is used to support the mask of each film layer in the evaporated light emitting structure. The first dam 50 includes at least one layer of the insulating layer 83, and the second dam 60 includes at least one layer of the insulating layer 83, so that the first dam 50 and the second dam 60 can be made in the same process as the insulating layer 83, reducing the process steps and reducing the process cost.

[0086] In addition, the flexible light-emitting panel further includes film layers such as a light extraction layer 84 , and the light extraction layer 84 is used to improve the light extraction efficiency of the light-emitting structure.

[0087] Fig.10 is a schematic diagram of another stretchable light-emitting device in a stretched state provided by an embodiment of the present invention. Based on the above embodiment, optionally, refer to Fig.10 The stretchable substrate 10 further includes a plurality of air holes 11, at least part of the air holes 11 are located in the hollow area 221 in the vertical projection of the flexible light-emitting panel 20, or the stretchable substrate 10 is made of a microporous structure material.

[0088] The stretchable substrate 10 is made of a microporous structure material or is provided with air holes 11 to ensure the air permeability of the stretchable light-emitting device and increase the wearing comfort during photomedical applications.

[0089] Based on the above embodiment, optionally, refer to Figure 2, the vertical projection of the support sheet 30 on the flexible light-emitting panel 20 covers the light-emitting area 21, and the ratio of the area of ​​the support sheet 30 to the area of ​​the light-emitting area 21 is less than or equal to 1.1.

[0090] This arrangement ensures that the flatness of the light-emitting area 21 is maintained while preventing the support sheet 30 from occupying too much area of ​​the non-light-emitting area, thereby improving the controllability of the stretch ratio of the light-emitting device.

[0091] Based on the above embodiment, optionally, the material used for the stretchable substrate 10 includes silicone rubber or polyurethane;

[0092] The material used for the support sheet 30 includes at least one of polyethylene terephthalate PET and polycarbonate PC;

[0093] The material of the flexible substrate includes polyimide.

[0094] Specifically, silicone rubber and polyurethane both have high stretchability and low material cost. The material used for the stretchable substrate 10 includes silicone rubber or polyurethane, which can reduce costs while ensuring that the stretchable light-emitting device has high stretchability.

[0095] Both polyethylene terephthalate PET and polycarbonate PC have high hardness and low material cost. The material used for the support sheet 30 includes at least one of polyethylene terephthalate PET and polycarbonate PC, which can ensure that the support sheet 30 better supports the light-emitting area 21, ensures the flatness of the light-emitting area 21, and can reduce costs.

[0096] The embodiment of the present invention adopts a hollow design of a flexible light-emitting panel, and adds a strain barrier area design on the periphery of each light-emitting area to ensure the flatness of the light-emitting area. A pre-stretched substrate is used to form controllable wrinkles in the routing area to achieve one-time molding of a stretchable light-emitting device. At the same time, the opening design of the hollow area and the stretchable substrate ensures the air permeability and wearing comfort of the screen during photomedical applications. This solution has high adaptability to existing processes and high mass producibility, and is suitable for photomedical masks, phototherapy patches, stretchable displays and other fields.

[0097] The embodiment of the present invention also provides a method for manufacturing a stretchable light-emitting device. Fig.11 is a flowchart of a method for manufacturing a stretchable light-emitting device provided by an embodiment of the present invention, with reference to Fig.11 , a method for making a stretchable light-emitting device comprises:

[0098] S110, preparing a flexible light-emitting panel; wherein the flexible light-emitting panel includes a plurality of light-emitting areas and non-light-emitting areas, the non-light-emitting areas between adjacent light-emitting areas include a plurality of hollow areas, and the hollow areas run through the flexible light-emitting panel.

[0099] Specifically, Fig.12 is a schematic diagram of a process for preparing a flexible light-emitting panel provided by an embodiment of the present invention, Fig.12 The figure shows a flexible light-emitting panel before the hollow area is formed. A flexible light-emitting panel 20 is prepared on the glass, and the clearance area 223 between the independent light-emitting areas 21 and the center of the horizontal and vertical electrode wiring is hollowed out by laser drilling and other processes. Part of the polyimide flexible substrate is retained on both sides of the electrode harness to release stress and form an island bridge grid structure. After the organic light-emitting structure and the packaging structure are prepared, laser peeling or mechanical peeling is used to peel the flexible light-emitting panel 20 from the glass to form a flexible light-emitting panel with a polyimide flexible substrate.

[0100] S120, pre-stretching the stretchable substrate. S130, fixing the flexible light-emitting panel on the surface of the stretchable substrate; wherein the stretchable substrate is arranged on the non-light-emitting side of the flexible light-emitting panel; a support sheet is arranged between each light-emitting area and the stretchable substrate; the support sheet is connected to the flexible light-emitting panel and the stretchable substrate through an adhesive layer, and the non-light-emitting area is connected to the stretchable substrate through an adhesive layer.

[0101] Fig.13 is a schematic diagram of a flexible light-emitting device in a stretched state, see Fig.13 , the stretchable substrate 10 is four-axis pre-stretched, and the flexible light-emitting panel 20 is adhered to the pre-stretched substrate 10.

[0102] S140, removing the tension on the stretchable substrate, so that the non-luminous area of ​​the flexible light-emitting panel and the stretchable substrate connected to the non-luminous area have bending wrinkles.

[0103] Specifically, after removing the tension of the stretchable substrate, a Figure 3 A stretchable light-emitting device with bent folds is shown.

[0104] The preparation method of the stretchable light-emitting device provided in an embodiment of the present invention and the stretchable device provided in any embodiment of the present invention belong to the same invention communication concept and have the same beneficial effects. For technical details not detailed in this embodiment, please refer to the stretchable light-emitting device described in any embodiment of the present invention.

[0105] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0106] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A stretchable light-emitting device, characterized in that: include: A stretchable substrate and a flexible light-emitting panel, wherein the stretchable substrate is arranged on the non-light-emitting side of the flexible light-emitting panel; The flexible light-emitting panel includes a plurality of light-emitting areas and a non-light-emitting area, and a support sheet is provided between each of the light-emitting areas and the stretchable substrate; the support sheet is connected to the flexible light-emitting panel and the stretchable substrate through an adhesive layer, and the non-light-emitting area is connected to the stretchable substrate through an adhesive layer; the non-light-emitting area between adjacent light-emitting areas includes a plurality of hollow areas, and the hollow areas penetrate the flexible light-emitting panel; The non-luminous area of ​​the flexible luminous panel and the stretchable substrate connected to the non-luminous area have bending wrinkles.

2. The stretchable light-emitting device according to claim 1, characterized in that: The flexible light-emitting panel comprises a flexible substrate and a plurality of light-emitting structures which are stacked in sequence; the flexible substrate is arranged on a side of the light-emitting structure adjacent to the stretchable substrate; the light-emitting structure is located in the light-emitting area; The non-luminous area includes a lead area; in the lead area, an electrode trace is provided on a side of the flexible substrate adjacent to the light-emitting structure, each of the electrode traces is electrically connected to one of the light-emitting structures; the electrode traces are used to transmit a driving signal to the light-emitting structure; A clearance area is arranged between adjacent lead areas, and the hollow area is arranged in the clearance area; and a distance between an edge of the hollow area and an edge of the clearance area is greater than zero.

3. The stretchable light-emitting device according to claim 1, characterized in that: Each of the light-emitting areas is correspondingly provided with a packaging effective area and a strain barrier area; the packaging effective area and the strain barrier area are both arranged around the light-emitting area, and the strain barrier area is arranged on a side of the packaging effective area away from the light-emitting area, and the hollow area is arranged on a side of the strain barrier area away from the light-emitting area; The flexible light-emitting panel comprises a flexible substrate, a plurality of light-emitting structures and an encapsulation layer which are stacked in sequence; the flexible substrate is arranged on a side of the light-emitting structure adjacent to the stretchable substrate; the light-emitting structure is located in the light-emitting area; In the encapsulation effective area, at least one first dam is disposed on a side of the flexible substrate adjacent to the light emitting structure, and the first dam surrounds the light emitting area; the encapsulation layer includes an organic layer and an inorganic layer, and the first dam is used to block the organic layer; the inorganic layer extends to the encapsulation effective area and covers the first dam; In the strain barrier region, at least one second dam and at least one strain barrier groove are disposed on a side of the flexible substrate away from the stretchable substrate, and both the second dam and the strain barrier groove surround the packaging active region.

4. The stretchable light-emitting device according to claim 3, characterized in that: The vertical projections of the second dam and the strain barrier groove on the flexible substrate are both closed rings; Alternatively, each of the second dams includes a plurality of sub-dams, and each of the strain blocking grooves includes a plurality of sub-grooves; a plurality of sub-dams are arranged around the light-emitting area, and a plurality of sub-grooves are arranged around the light-emitting area, and along the direction surrounding the light-emitting area, the sub-dams in different second dams are staggered, and the sub-grooves in different strain blocking grooves are staggered.

5. The stretchable light-emitting device according to claim 3, characterized in that: The vertical projection of the second dam on the flexible substrate includes at least one of a straight line, a broken line and a curve; A vertical projection of the strain barrier groove on the flexible substrate includes at least one of a straight line, a broken line and a curved line.

6. The stretchable light-emitting device according to claim 3, characterized in that: The depth of the strain barrier groove in the flexible substrate is 3-5 μm, and the height of the second dam is 2-6 μm; Along the direction from the light emitting area to the strain barrier area, the widths of the strain barrier groove and the second dam are both 30-60 um.

7. The stretchable light-emitting device according to claim 3, characterized in that: The flexible light-emitting panel further includes at least one insulating layer, which is disposed between the flexible substrate and the light-emitting structure; the first dam includes at least one of the insulating layers, and the second dam includes at least one of the insulating layers.

8. The stretchable light-emitting device according to claim 1, characterized in that: The stretchable substrate further comprises a plurality of air holes, at least some of which are located in the hollow area in the vertical projection of the flexible light-emitting panel, or the stretchable substrate is made of a microporous structure material; The vertical projection of the support sheet on the flexible light-emitting panel covers the light-emitting area, and the ratio of the area of ​​the support sheet to the area of ​​the light-emitting area is less than or equal to 1.

1.

9. The stretchable light-emitting device according to claim 2, characterized in that: The material used for the stretchable substrate includes silicone rubber or polyurethane; The material used for the support sheet includes at least one of polyethylene terephthalate (PET) and polycarbonate (PC); The material of the flexible substrate includes polyimide.

10. A method for manufacturing a stretchable light-emitting device, characterized in that: include: Prepare a flexible light-emitting panel; wherein the flexible light-emitting panel comprises a plurality of light-emitting areas and a non-light-emitting area, the non-light-emitting area between adjacent light-emitting areas comprises a plurality of hollow areas, and the hollow areas penetrate the flexible light-emitting panel; pre-stretching the stretchable substrate; The flexible light-emitting panel is fixedly arranged on the surface of the stretchable substrate; wherein the stretchable substrate is arranged on the non-light-emitting side of the flexible light-emitting panel; a support sheet is arranged between each of the light-emitting areas and the stretchable substrate; the support sheet is connected to the flexible light-emitting panel and the stretchable substrate through an adhesive layer, and the non-light-emitting area is connected to the stretchable substrate through an adhesive layer; The tension on the stretchable substrate is removed, so that the non-luminous area of ​​the flexible light-emitting panel and the stretchable substrate connected to the non-luminous area have bending wrinkles.

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