Stretchable display module, terminal device
By employing a composite heat sink and airbag structure design in the stretchable display module, combined with thermally conductive materials and curved metal traces, the problem of not being able to balance stretchability and heat dissipation in existing technologies has been solved, achieving efficient heat dissipation under dynamic conditions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- WUHAN CHINA STAR OPTOELECTRONICS TECH CO LTD
- Filing Date
- 2024-01-16
- Publication Date
- 2026-07-24
AI Technical Summary
Existing stretchable display modules cannot balance stretchability and heat dissipation. Thermally conductive materials such as graphite sheets and copper foil cannot be used on stretchable screens, and stretchable screens generate a lot of heat under dynamic conditions.
The composite heat sink design includes a first flexible substrate and spaced heat sinks. The display panel and the heat sinks partially overlap. Combined with an airbag structure and thermally conductive materials, the heat dissipation effect is enhanced by gas flow, and stretchable allowance is reserved on the metal traces to prevent breakage.
While maintaining stretchability, it significantly improves the heat dissipation effect of stretchable display modules, solving the technical challenge of balancing stretchability and heat dissipation.
Smart Images
Figure CN117765824B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of display technology, specifically to a stretchable display module and a terminal device. Background Technology
[0002] With the rapid development of the display industry, stretchable screens are a major future development direction for displays, and heat dissipation of stretchable screens is a critical issue that urgently needs to be addressed. Currently, the main heat dissipation approach in the display industry is to add thermally conductive materials such as graphite sheets and copper foils between the module stacks. However, in the future stretchable display industry, this heat dissipation solution cannot be applied because graphite sheets and copper foils have weak ductility. In addition, stretchable screens tend to generate more heat when in dynamic conditions for extended periods, making it imperative to solve the heat dissipation problem of stretchable screens.
[0003] Therefore, existing stretchable display modules have the technical problem of not being able to balance stretchability and heat dissipation. Summary of the Invention
[0004] This application provides a stretchable display module and a terminal device, which can alleviate the technical problem that existing stretchable display modules cannot simultaneously achieve stretchability and heat dissipation.
[0005] This application provides a stretchable display module, including:
[0006] A composite heat sink, comprising a first flexible substrate and heat sinks disposed above the first flexible substrate, with adjacent heat sinks spaced apart.
[0007] The display panel is disposed on the surface of the heat sink away from the first flexible substrate, and the display panel includes a second flexible substrate and a plurality of light-emitting units disposed on the side of the second flexible substrate away from the first flexible substrate;
[0008] In the film thickness direction, one of the heat sinks and one of the light-emitting units are arranged to at least partially overlap.
[0009] Optionally, in some embodiments of this application, the composite heat sink further includes an airbag structure, the airbag structure including a cavity and a dam layer disposed around the cavity, the dam layer being disposed between the first flexible substrate and the heat sink, the dam layer contacting the first flexible substrate and the heat sink to form the cavity, and the heat sink having through holes for gas flow within the airbag structure.
[0010] Optionally, in some embodiments of this application, adjacent light-emitting units are electrically connected by metal traces, the outline of which is curved.
[0011] Optionally, in some embodiments of this application, the outline shape of the metal trace is at least one of stepped, wavy, or triangular pyramidal.
[0012] Optionally, in some embodiments of this application, when the stretchable display module is stretched laterally, the airbag structure is stretched laterally, the volume of the cavity decreases, and the gas in the cavity is discharged from the through hole.
[0013] Optionally, in some embodiments of this application, the dam layer includes a first portion disposed above the first flexible substrate and a second portion disposed away from the first flexible substrate, wherein the second portion is made of a flexible and stretchable material.
[0014] Optionally, in some embodiments of this application, the materials used to prepare the first flexible substrate and the second flexible substrate include organic materials, and both the first flexible substrate and the second flexible substrate are doped with thermally conductive materials, wherein the thermal conductivity of the thermally conductive materials is greater than that of the organic materials.
[0015] Optionally, in some embodiments of this application, the stretchable display module includes a stretchable region and a thermally conductive region, wherein the thermally conductive regions of the first flexible substrate and the second flexible substrate are doped with thermally conductive materials.
[0016] Optionally, in some embodiments of this application, an airbag structure and a light-emitting unit are aligned, and the orthographic projection of the through hole on the first flexible substrate falls on the orthographic projection of the light-emitting unit on the first flexible substrate.
[0017] This application provides a terminal device, which includes the stretchable display module described in any of the above embodiments.
[0018] Beneficial effects: By including multiple spaced heat sinks in the composite heat sink, the impact on tensile properties is small because the heat sinks are not arranged on the entire surface but spaced apart. Furthermore, in the film thickness direction, one of the heat sinks and one of the light-emitting units are at least partially overlapped, which can improve the heat dissipation effect on the light-emitting unit. While taking into account the tensile properties, it can also improve the heat dissipation effect of the stretchable display module, thus alleviating the technical problem that existing stretchable display modules cannot simultaneously take into account both tensile properties and heat dissipation effect. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a three-dimensional schematic diagram of the stretchable display module provided in this application;
[0021] Figure 2 This is a top view of the stretchable display module provided in this application;
[0022] Figure 3 The stretchable display module provided in this application is in Figure 2 A schematic diagram of the first type of cross-section at point AA;
[0023] Figure 4 The stretchable display module provided in this application is in Figure 2 A schematic diagram of the second type of cross-section at point AA;
[0024] Figure 5 This is a flowchart of the method for manufacturing the stretchable display module provided in this application;
[0025] Figures 6A to 6F This is a process state diagram of the stretchable display module provided in this application;
[0026] Figure 7 This is a three-dimensional schematic diagram of the terminal device provided in this application.
[0027] Explanation of reference numerals in the attached figures:
[0028] Detailed Implementation
[0029] The embodiments described in this application are merely exemplary embodiments of the inventive concept, which can be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein.
[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.
[0031] Please see Figures 1 to 4The stretchable display module 10 provided in this application includes a composite heat sink and a display panel. The composite heat sink includes a first flexible substrate 1 and heat sinks 3 disposed above the first flexible substrate 1. Adjacent heat sinks 3 are spaced apart. The display panel is disposed on the surface of the heat sinks 3 away from the first flexible substrate 1. The display panel includes a second flexible substrate 5 and a plurality of light-emitting units 6 disposed on the side of the second flexible substrate 5 away from the first flexible substrate 1. In the film thickness direction, a heat sink 3 and a light-emitting unit 6 are at least partially overlapped.
[0032] In this embodiment, by making the composite heat sink plate include a plurality of heat sinks 3 arranged at intervals, since the heat sinks 3 are not arranged on the entire surface but are arranged at intervals, the impact on the tensile properties is small. In addition, in the film thickness direction, one of the heat sinks 3 and one of the light-emitting units 6 are at least partially overlapped, which can improve the heat dissipation effect on the light-emitting unit 6. While taking into account the tensile properties, it can also improve the heat dissipation effect of the stretchable display module 10.
[0033] The technical solution of this application will now be described in conjunction with specific embodiments.
[0034] The outline shape, preparation materials, thermally conductive materials, elongation, etc. of this application are only described with reference to the best or preferred embodiments. Other conditions that can meet the requirements of the process and modification reaction should also fall within the protection scope of this invention, and will not be described in detail here.
[0035] In one embodiment, please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 The composite heat sink also includes an airbag structure 2, which includes a cavity 22 and a dam layer 21 surrounding the cavity 22. The dam layer is disposed between the first flexible substrate and the heat sink, and the dam layer contacts the first flexible substrate and the heat sink to form the cavity. The heat sink 3 has a through hole 4.
[0036] The dam layer 21 is made of a flexible and stretchable material.
[0037] The aperture of the through hole 4 ranges from 1 micrometer to 20 micrometers.
[0038] It is understood that the airbag structure 2 is stretchable, and the airbag structure 2 can be stretched synchronously with the stretchable display module 10, thereby converting the stretching action of the stretchable display module 10 into the flow of gas in the airbag structure 2. Through the thermal convection of gas, the heat dissipation problem of the stretchable module is improved.
[0039] In this embodiment, the airbag structure 2 can accelerate airflow, thereby improving the heat dissipation effect within the stretchable display module 10.
[0040] In one embodiment, one end of the dam layer 21 is disposed on the first flexible substrate 1, and the other end of the dam layer 21 abuts against a heat sink 3.
[0041] In one embodiment, please refer to Figure 1 The adjacent light-emitting units 6 are electrically connected by metal traces 7, and the outline of the metal traces 7 is curved.
[0042] The fact that the outline of the metal trace 7 is curved means that the total length of the metal trace 7 is at least greater than the minimum distance between adjacent light-emitting units 6.
[0043] The outline shape of the metal trace 7 can be at least one of the following: stepped, wavy, or triangular pyramidal.
[0044] It is understandable that by setting the metal trace 7 as a curve, the metal trace 7 is provided with a stretchable amount. When the stretchable display module 10 is stretched, the metal trace 7 is stretched synchronously to generate deformation. Since the metal trace 7 is provided with a stretchable amount, and the stretchable amount is greater than the deformation, the metal trace 7 is prevented from breaking during the stretching process.
[0045] In this embodiment, by providing stretchable allowance for the metal trace 7, the possibility of the metal trace 7 breaking during the stretching process is reduced.
[0046] In one embodiment, please refer to Figure 3 , Figure 4 When the stretchable display module 10 is stretched laterally, the airbag structure 2 is stretched laterally, the volume of the cavity 22 decreases, and the gas in the cavity 22 is discharged from the through hole 4.
[0047] Understandably, please refer to Figure 4 During the stretching process of the stretchable display module 10, the airbag structure 2 is also stretched laterally, which reduces the volume of the cavity 22 inside the airbag structure 2 after compression. The gas inside the airbag structure 2 is then discharged from the through hole 4 after compression, thereby enhancing the gas flow inside the stretchable display module 10.
[0048] Understandably, please refer to Figure 3 When the stretchable display module 10 returns to its initial state after being stretched, the volume of the airbag structure 2 gradually increases, and gas is drawn into the airbag structure 2, which also enhances the gas flow within the stretchable display module 10.
[0049] In this embodiment, when the stretchable display module 10 is stretched laterally, the stretching action of the stretchable display module 10 is converted into the flow of gas inside the stretchable display module 10, thereby enhancing the gas flow inside the stretchable display module 10 and enhancing the heat dissipation effect of the stretchable display module 10.
[0050] In one embodiment, please refer to Figure 1 The dam layer 21 includes a first portion 201 disposed above the first flexible substrate 1 and a second portion 202 disposed away from the first flexible substrate 1. The second portion 202 is made of a flexible and stretchable material.
[0051] The material used to prepare the first part 201 can be a rigid material.
[0052] The thickness of the first portion 201 can range from 0.02 mm to 0.04 mm.
[0053] The thickness of the second part 202 can be approximately 0.1 mm.
[0054] It is understandable that the first part 201 is made of rigid material to facilitate the preparation of the dam layer 21 and the cavity 22. Since the flexible and stretchable material is difficult to directly form the cavity 22, the first part 201 can be set first, a sacrificial layer can be filled in the first part 201, and then a flexible and stretchable material can be coated on the side wall of the sacrificial layer to prepare the second part 202. After removing the sacrificial layer, the cavity 22 is obtained.
[0055] It is understandable that the material used to prepare the second part 202 is a flexible material, which facilitates the stretching of the airbag structure 2.
[0056] In this embodiment, a dam layer 21 structure is provided, which can simplify the support of the airbag structure 2 and improve the process yield.
[0057] In one embodiment, please refer to Figure 1 The materials used to prepare the first flexible substrate 1 and the second flexible substrate 5 include organic materials. Both the first flexible substrate 1 and the second flexible substrate 5 are doped with thermally conductive materials, and the thermal conductivity of the thermally conductive materials is greater than that of the organic materials.
[0058] It is understood that at least one of the first flexible substrate 1 and the second flexible substrate 5 is also doped with a thermally conductive material, thereby improving the thermal conductivity of the first flexible substrate 1 and the second flexible substrate 5.
[0059] In this embodiment, by filling the first flexible substrate 1 and the second flexible substrate 5 with thermally conductive material, the thermal conductivity of the first flexible substrate 1 and the second flexible substrate 5 can be enhanced while maintaining flexibility and stretchability, thereby improving the heat dissipation effect of the stretchable display module 10.
[0060] In one embodiment, the stretchable display module 10 includes a stretchable region and a thermally conductive region, wherein the thermally conductive regions of the first flexible substrate 1 and the second flexible substrate 5 are doped with thermally conductive materials.
[0061] Understandably, thermally conductive materials can be selectively doped only in the thermally conductive areas. On the one hand, this can save materials and reduce costs. On the other hand, doping with thermally conductive materials will reduce stretchability. By not doping with thermally conductive materials in the stretchable areas, the stretchability and flexibility of the stretchable areas can be improved compared to doping with thermally conductive materials on the entire surface.
[0062] In one embodiment, please refer to Figure 1 , Figure 3 , Figure 4 The airbag structure 2 and the light-emitting unit 6 are aligned, and the orthographic projection of the through hole 4 on the first flexible substrate 1 falls on the orthographic projection of the light-emitting unit 6 on the first flexible substrate 1.
[0063] The airbag structure 2 is aligned with the light-emitting unit 6.
[0064] It is understandable that, in the film thickness direction, by making the orthogonal projection of the through hole 4 fall within the orthogonal projection of the light-emitting unit 6, the heat dissipation effect of the airbag structure 2 on the light-emitting unit 6 is further improved.
[0065] In one embodiment, the thickness of the heat sink 3 ranges from 0.02 mm to 0.04 mm.
[0066] In one embodiment, the materials used to prepare the first flexible substrate 1 and the second flexible substrate 5 may be polydimethylsiloxane.
[0067] Please see Figure 5 , Figures 6A to 6F This application provides a method for manufacturing a stretchable display module 10, comprising:
[0068] S1: Provide a first flexible substrate 1;
[0069] S2: A dam layer 21 is prepared on the first flexible substrate 1, and the dam layer 21 surrounds and forms a cavity 22. The cavity 22 and the dam layer 21 together form the airbag structure 2.
[0070] S3: A heat sink 3 is prepared on the side of the dam layer 21 away from the first flexible substrate 1. The heat sink 3 is aligned with the airbag structure 2. Each heat sink 3 is provided with a through hole 4.
[0071] S4: A display panel is provided, and the display panel is placed on the side of the heat sink 3 away from the first flexible substrate 1. The light-emitting unit 6 in the display panel is at least partially overlapped with the heat sink 3 in the film thickness direction.
[0072] Please refer to Figure 6A , Figure 6B , Figure 6C The step of preparing the dam layer 21 may further include: printing a first part 201 on the first flexible substrate 1, the first part 201 being arranged in a surrounding manner, filling the first part 201 with photoresist 8, coating the sidewalls of the photoresist 8 with a flexible stretchable material, and preparing a second part 202 from the flexible stretchable material, the first part 201 and the second part 202 constituting the dam layer 21.
[0073] Please refer to Figure 6C Remove the photoresist 8 to form the cavity 22.
[0074] Please refer to Figure 6D The step of preparing the heat sink 3 on the side of the dam layer 21 away from the first flexible substrate 1 further includes: attaching a copper sheet to the side of the dam layer 21 away from the first flexible substrate 1, and drilling holes in the copper sheet to prepare the heat sink 3.
[0075] Please refer to Figure 6E , Figure 6F The step of placing the display panel on the side of the heat sink 3 away from the first flexible substrate 1 is specifically to form the second flexible substrate 5 on the entire side of the heat sink 3 away from the first flexible substrate 1, and to prepare the light-emitting unit 6 and metal traces 7 on the second flexible substrate 5.
[0076] In this process, a frame adhesive 9 is applied to the edge, which is used to support the second flexible substrate 5 and form a gap between the first flexible substrate 1 and the second flexible substrate 5.
[0077] The photoresist 8 has a thickness of approximately 0.15 mm.
[0078] The thickness of the frame adhesive 9 is approximately 0.3 mm.
[0079] This application also proposes a terminal device 12, please refer to... Figure 7The terminal device 12 includes the stretchable display module 10 and the terminal body 11, which will not be described in detail here. The terminal device 12 includes, but is not limited to, mobile phones, laptops, and tablets.
[0080] The terminal body 11 can be a frame.
[0081] The stretchable display module provided in this application includes a composite heat sink and a display panel. The composite heat sink includes a first flexible substrate and heat sinks disposed above the first flexible substrate. Adjacent heat sinks are spaced apart. The display panel is disposed on the surface of the heat sinks away from the first flexible substrate. The display panel includes a second flexible substrate and a plurality of light-emitting units disposed on the second flexible substrate away from the first flexible substrate. In the film thickness direction, a heat sink and a light-emitting unit are at least partially overlapped. By including a plurality of spaced heat sinks in the composite heat sink, the impact on stretchability is small because the heat sinks are not disposed across the entire surface but spaced apart. Furthermore, the fact that a heat sink and a light-emitting unit are at least partially overlapped in the film thickness direction improves the heat dissipation effect on the light-emitting units. This improves the heat dissipation effect of the stretchable display module while maintaining stretchability.
[0082] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.
[0083] The stretchable display module provided in the embodiments of this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.
Claims
1. A stretchable display module, characterized in that, include: A composite heat sink includes a first flexible substrate, a plurality of heat sinks disposed above the first flexible substrate, and an airbag structure. Adjacent heat sinks are spaced apart. The airbag structure includes a cavity and a dam layer disposed around the cavity. The dam layer is disposed between the first flexible substrate and the heat sinks and contacts the first flexible substrate and the heat sinks to form the cavity. The heat sinks are provided with through holes for gas to flow through the airbag structure. The display panel is disposed on the side of the heat sink away from the first flexible substrate, and the display panel includes a second flexible substrate and a plurality of light-emitting units disposed on the side of the second flexible substrate away from the first flexible substrate; In the film thickness direction, one of the heat sinks and one of the light-emitting units are arranged to at least partially overlap.
2. The stretchable display module as described in claim 1, characterized in that, The light-emitting unit is an LED light-emitting chip, and adjacent LED light-emitting chips are electrically connected by metal traces, the outline of which is curved.
3. The stretchable display module as described in claim 2, characterized in that, The outline shape of the metal trace is at least one of the following: stepped, wavy, and triangular pyramidal.
4. The stretchable display module as described in claim 2, characterized in that, When the stretchable display module is stretched laterally, the airbag structure is stretched laterally, the volume of the cavity decreases, and the gas inside the cavity is discharged from the through hole.
5. The stretchable display module as described in claim 4, characterized in that, The dam layer includes a first portion disposed above the first flexible substrate and a second portion disposed away from the first flexible substrate, wherein the second portion is made of a flexible and stretchable material.
6. The stretchable display module as described in claim 1, characterized in that, The materials used to prepare the first flexible substrate and the second flexible substrate include organic materials. Both the first flexible substrate and the second flexible substrate are doped with thermally conductive materials, and the thermal conductivity of the thermally conductive materials is greater than that of the organic materials.
7. The stretchable display module as described in claim 6, characterized in that, The stretchable display module includes a stretchable region and a thermally conductive region, wherein the thermally conductive regions of the first flexible substrate and the second flexible substrate are doped with thermally conductive materials.
8. The stretchable display module as described in claim 1, characterized in that, The airbag structure and the light-emitting unit are aligned, and the orthographic projection of the through hole on the first flexible substrate falls on the orthographic projection of the light-emitting unit on the first flexible substrate.
9. A terminal device, characterized in that, The terminal device includes a stretchable display module as described in any one of claims 1 to 8.