Convection device and display device

Abstract

The invention relates to the technical field of display, and discloses a convection device and a display device. The convection device comprises a convection shell and a piezoelectric device. The convection shell comprises a body part and an elastic film layer, the body part is provided with a concave part, the elastic film layer is arranged on the side, provided with the concave part, of the body part so that a convection cavity can be formed in the concave part, an air inlet hole is formed in the convection shell, an air outlet hole is formed in the body part, and the air outlet hole and a device to be cooled are oppositely arranged; the piezoelectric device is arranged on one side of the elastic film layer. The convection device can cool the display panel, so that the heating of the display panel is reduced, the service life of the display panel is prolonged, and the power consumption of the display panel is reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a convection device and a display apparatus. Background Art

[0002] At present, display panels generate severe heat, which greatly affects the life of the display panels and causes high power consumption of the display panels; especially in small-size scenarios (for example, VR, AR, watches, etc.), the display panel is close to the main circuit board and has no active heat dissipation devices, which further worsens the heating problem.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0004] The purpose of the present disclosure is to overcome the deficiencies of the above-mentioned prior art and provide a convection device and a display apparatus.

[0005] According to one aspect of the present disclosure, there is provided a convection device, comprising:

[0006] A convection housing, comprising a main body and an elastic membrane layer, wherein the main body has a recessed portion, the elastic membrane layer is arranged on one side of the main body where the recessed portion is arranged, so that the recessed portion forms a convection cavity, the convection housing is provided with an air inlet hole, the main body is provided with an air outlet hole, and the air outlet hole is arranged opposite to the device to be cooled;

[0007] The piezoelectric device is arranged on one side of the elastic membrane layer.

[0008] In an exemplary embodiment of the present disclosure, the piezoelectric device is disposed on a side of the elastic film layer close to the main body, or the piezoelectric device is disposed on a side of the elastic film layer away from the main body.

[0009] In an exemplary embodiment of the present disclosure, the air outlet is arranged opposite to the piezoelectric device.

[0010] In an exemplary embodiment of the present disclosure, the body portion comprises:

[0011] A support layer, disposed on one side of the elastic membrane layer, wherein the support layer is arranged in a ring shape;

[0012] The exhaust layer is arranged on a side of the support layer away from the elastic membrane layer.

[0013] In an exemplary embodiment of the present disclosure, the air inlet hole is provided in the elastic membrane layer, or the air inlet hole is provided in the supporting layer.

[0014] In an exemplary embodiment of the present disclosure, when the air inlet hole is arranged on the supporting layer, the distance between the edge line of the air inlet hole close to the exhaust layer and the exhaust layer in the first direction is a first distance, and the ratio of the first distance to the depth of the convection cavity in the first direction is greater than or equal to 2 / 3 and less than or equal to 4 / 5, and the first direction is perpendicular to the elastic membrane layer.

[0015] In an exemplary embodiment of the present disclosure, the depth of the convection chamber in the first direction is greater than or equal to 5 microns and less than or equal to 30 microns;

[0016] And / or, the ratio of the diameter of the air inlet hole to the diameter of the air outlet hole is greater than or equal to 0.5 and less than or equal to 1.5, the ratio of the diameter of the convection cavity to the depth of the convection cavity in the first direction is greater than or equal to 5 and less than or equal to 15; the ratio of the diameter of the air outlet hole to the depth of the convection cavity in the first direction is greater than or equal to 0.2 and less than or equal to 1;

[0017] And / or, the ratio of the diameter of the piezoelectric device to the diameter of the elastic membrane layer is greater than or equal to 0.6 and less than or equal to 0.9; in the first direction, the ratio of the thickness of the elastic membrane layer to the thickness of the piezoelectric device is greater than or equal to 0.2 and less than or equal to 0.8;

[0018] And / or, the thickness of the exhaust layer is more than one times the diameter of the air outlet, the ratio of the depth of the convection cavity in the first direction to the width of the support layer is less than or equal to 20:1, and the first direction is perpendicular to the elastic membrane layer.

[0019] In an exemplary embodiment of the present disclosure, the air inlet is configured in a strip shape, and the ratio of the area of ​​the air inlet to the area of ​​the circular air outlet is greater than or equal to 2;

[0020] The distance between the edge of the air inlet and the edge of the elastic membrane layer is L0, the distance between the edge of the piezoelectric device and the edge of the elastic membrane layer is L, and the ratio of L0 to L is less than or equal to 1 / 3.

[0021] In an exemplary embodiment of the present disclosure, the number of the air outlet holes is less than or equal to 9.

[0022] According to another aspect of the present disclosure, there is provided a display device, comprising:

[0023] Device to be cooled;

[0024] The convection device is any of the convection devices described above.

[0025] In the convection device disclosed herein, under the action of an external electric field, the piezoelectric device will vibrate, thereby driving the elastic film layer to vibrate. When the elastic film layer bulges outward due to the vibration, cold air will enter the convection cavity through the air inlet hole; when the elastic film layer is concave inward due to the vibration, the air in the convection cavity will be blown out through the air outlet hole, and the blown gas will cool the display panel, thereby reducing the heat generation of the display panel, thereby increasing the life of the display panel and reducing the power consumption of the display panel.

[0026] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0028] Figure 1 It is a schematic structural diagram of a first exemplary embodiment of a convection device disclosed in the present invention.

[0029] Figure 2 The operating temperature of the display device in the prior art obtained by simulation when the brightness is required.

[0030] Figure 3 The operating temperature of the display device of the present disclosure obtained by simulation when the brightness is required.

[0031] Figure 4 It is a schematic structural diagram of a second exemplary embodiment of a convection device disclosed in the present invention.

[0032] Figure 5 It is a schematic structural diagram of a third exemplary embodiment of a convection device disclosed in the present invention.

[0033] Figure 6 It is a schematic structural diagram of a fourth exemplary embodiment of a convection device disclosed in the present invention.

[0034] Figure 7 for Figure 1 Schematic diagram of the top view structure of the array formed by the convection devices.

[0035] Figure 8 for Figure 5 Schematic diagram of the bottom-up structure of the array formed by the convection devices in FIG.

[0036] Fig. 9 for Figure 1 Schematic diagram of the convection device in FIG.

[0037] Fig.10 for Figure 4 Schematic diagram of the convection device in FIG.

[0038] Fig.11 for Figure 1 Schematic diagram of the convection device in FIG.

[0039] Fig.12 The figure is a diagram showing the relationship between the jet flow rate and the power consumption of the convection device of the present invention under different working conditions.

[0040] Fig.13 The figure is a schematic diagram of the relationship between display panel efficiency and temperature obtained from the test.

[0041] Fig.14 It is a schematic structural diagram of an exemplary embodiment of the display device disclosed in the present invention.

[0042] Fig.15 It is a schematic structural diagram of another exemplary embodiment of the display device disclosed in the present invention.

[0043] Description of reference numerals:

[0044] 1. Convection shell; 1a. Convection cavity; 11. Main body; 111. Concave portion; 112. Air outlet; 113. Support layer; 114. Exhaust layer; 12. Elastic membrane layer; 13. Air inlet;

[0045] 2. piezoelectric device; 21. first electrode; 22. piezoelectric layer; 23. second electrode;

[0046] 3. Connect the wires;

[0047] 10. convection device; 20. device to be cooled; 30. connection layer;

[0048] FPC, circuit board;

[0049] X, first direction. DETAILED DESCRIPTION

[0050] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present disclosure will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0051] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of the illustration to another component, these terms are used in this specification only for convenience, such as according to the orientation of the examples described in the drawings. It is understood that if the device of the illustration is turned upside down, the component described as "upper" will become the component "lower". When a structure is "on" other structures, it may mean that the structure is formed integrally on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

[0052] The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may exist in addition to the listed elements / components / etc.; the terms "first", "second" and "third" etc. are used merely as labels and are not intended to limit the quantity of their objects.

[0053] In this application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. "And / or" is just a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the previous and next associated objects are in an "or" relationship.

[0054] The exemplary embodiment of the present disclosure provides a convection device 10, referring to Figure 1 , Figure 3-Figure 12 As shown, the convection device 10 may include a convection shell 1 and a piezoelectric device 2; the convection shell 1 may include a main body 11 and an elastic membrane layer 12, the main body 11 has a recessed portion 111, the elastic membrane layer 12 is arranged on a side of the main body 11 where the recessed portion 111 is arranged, so that the recessed portion 111 forms a convection cavity 1a, the convection shell 1 is provided with an air inlet 13, the main body 11 is provided with an air outlet 112, and the air outlet 112 is arranged opposite to the device to be cooled 20; the piezoelectric device 2 is arranged on one side of the elastic membrane layer 12.

[0055] In the convection device 10 disclosed in the present invention, under the action of an external electric field, the piezoelectric device 2 will vibrate, thereby driving the elastic film layer 12 to vibrate. When the elastic film layer 12 bulges outward due to the vibration, cold air will enter the convection cavity 1a through the air inlet 13; when the elastic film layer 12 is concave inward due to the vibration, the air in the convection cavity 1a will be blown out through the air outlet 112, and the blown gas will cool the display panel, thereby reducing the heat generation of the display panel, thereby increasing the life of the display panel and reducing the power consumption of the display panel.

[0056] Compared with conventional jets, the advantages of the convection device 10 disclosed in the present invention are: no need for traditional pipes, no need for working fluid supply, high jet velocity, small size, compactness, light weight, low cost, strong manufacturability, high reliability, short response time, etc. Therefore, it is very suitable for high-speed fluid actuators and is often used as pump bodies.

[0057] In this example implementation, refer to Figure 1 As shown, the convection housing 1 may include a main body 11 and an elastic membrane layer 12. The main body 11 has a recessed portion 111. Specifically, the main body 11 may include a support layer 113 and a venting layer 114; the support layer 113 is arranged on one side of the elastic membrane layer 12, and the venting layer 114 is arranged on the side of the support layer 113 away from the elastic membrane layer 12, that is, the support layer 113 is arranged between the elastic membrane layer 12 and the venting layer 114; the support layer 113 is arranged in an annular shape, so that after the support layer 113 and the venting layer 114 are connected, a recessed portion 111 is formed in the ring of the support layer 113. The elastic membrane layer 12 is arranged on the side of the main body 11 where the recessed portion 111 is arranged, so that the recessed portion 111 forms a convection cavity 1a; that is, after the support layer 113 and the elastic membrane layer 12 are connected, a convection cavity 1a is formed in the ring of the support layer 113.

[0058] The material of the exhaust layer 114 may be silicon nitride, silicon oxide, silicon oxynitride, polyimide (PI), acrylic, etc.

[0059] The material of the support layer 113 can be silicon nitride, silicon oxide, silicon oxynitride, glass, copper, etc.

[0060] An air inlet 13 is provided on the convection shell 1, and the air inlet 13 is connected to the outside. The external low-temperature air can enter the convection cavity 1a through the air inlet 13. For example, the air inlet 13 is arranged on the side away from the device 20 to be cooled (for example, a display panel), so that cold air can enter through the air inlet 13.

[0061] An air outlet 112 is provided on the main body 11, and the air outlet 112 is arranged on a side close to the device 20 to be cooled (for example, a display panel), that is, the air outlet 112 is arranged opposite to the device 20 to be cooled (for example, a display panel), so that the gas blown through the air outlet 112 can cool the device 20 to be cooled (for example, a display panel).

[0062] The piezoelectric device 2 is arranged on one side of the elastic film layer 12. Under the action of an external electric field, the piezoelectric device 2 will vibrate, thereby driving the elastic film layer 12 to vibrate. When the elastic film layer 12 bulges outward due to the vibration, cold air will enter the convection cavity 1a through the air inlet 13; when the elastic film layer 12 is concave inward due to the vibration, the air in the convection cavity 1a will be blown out through the air outlet 112, and the blown gas will cool the display panel, thereby reducing the heat generation of the display panel, thereby increasing the life of the display panel and reducing the power consumption of the display panel.

[0063] Reference Figure 2 As shown in the figure, without considering the heat release and space of the main circuit board, the temperature of the display panel alone will reach about 87.6℃ (degC). Through testing, it is found that at the same brightness, the temperature of the tested display panel is about 86.4℃ (degC), so the simulated temperature is basically consistent with the actual test temperature. Figure 3 As shown, when the convection device is about 30 um away from the display panel, the temperature of the display panel after heat dissipation can be controlled at about 57.5° C. Through simulation, it can be seen that adding the convection device disclosed in the present invention can effectively reduce the operating temperature of the display panel.

[0064] Moreover, the thickness of the convection device 10 is much smaller than that of the centrifugal fan and the axial flow fan in the prior art, which is conducive to the lightweight and thin setting of the display device, and the noise and power are also greatly reduced.

[0065] The material of the elastic film layer 12 may be metal, inorganic material, etc. For example, the material of the elastic film layer 12 may be silicon nitride, silicon oxide, silicon oxynitride, copper, etc.

[0066] The convection device 10 can be formed by glass-based semiconductor processes, for example, by photolithography, transfer printing, etc. The convection device 10 is a MEMS (Micro-Electro-Mechanical Systems) convection device 10, so that the size of the convection device 10 is usually in the micrometer level.

[0067] In some example embodiments of the present disclosure, reference is made to Figure 1 and Figure 5 As shown, the piezoelectric device 2 can be arranged outside the convection cavity 1a, that is, the piezoelectric device 2 can be arranged on the side of the elastic membrane layer 12 away from the main body 11. Figure 4 and Figure 6 As shown, the piezoelectric device 2 can be arranged in the convection cavity 1a, that is, the piezoelectric device 2 can be arranged on the side of the elastic membrane layer 12 close to the main body 11. In this way, when the elastic membrane layer 12 is recessed inward due to vibration, the piezoelectric device 2 can contact the exhaust layer 114, that is, the piezoelectric device 2 can be used as a partial one-way valve, so that almost all the air in the convection cavity 1a can be blown out through the air outlet 112, thereby improving the cooling effect; and the internal pressure can be further increased, thereby improving the injection flow rate; and the thickness of the convection device 10 can be further reduced to be suitable for thin and light display devices.

[0068] Specifically, refer to Figure 1 , Figure 4-Figure 6 As shown, the piezoelectric device 2 may include a first electrode 21, a piezoelectric layer 22, and a second electrode 23; the first electrode 21 is disposed on one side of the elastic film layer 12, for example, when the piezoelectric device 2 is disposed outside the convection cavity 1a, the first electrode 21 is disposed on the side of the elastic film layer 12 away from the main body 11; when the piezoelectric device 2 is disposed in the convection cavity 1a, the first electrode 21 is disposed on the side of the elastic film layer 12 close to the main body 11. The piezoelectric layer 22 is disposed on the side of the first electrode 21 away from the elastic film layer 12; the second electrode 23 is disposed on the side of the piezoelectric layer 22 away from the elastic film layer 12, that is, the piezoelectric layer 22 is disposed between the first electrode 21 and the second electrode 23.

[0069] One of the first electrode 21 and the second electrode 23 is a positive electrode, and the other is a negative electrode; the first electrode 21 and the second electrode 23 can provide voltage to the piezoelectric layer 22. The first electrode 21 and the second electrode 23 are both made of conductive materials, for example, the first electrode 21 and the second electrode 23 are both made of metal.

[0070] The material of the piezoelectric layer 22 is a piezoelectric material, for example, the material of the piezoelectric layer 22 is PVDF (polyvinylidene fluoride) polymer, PZT (lead zirconate titanate) and composite piezoelectric material (piezoelectric material composed of thermoplastic polymer and inorganic piezoelectric material).

[0071] Reference Figure 7 and Figure 8 As shown, the convection device 10 may further include a connecting wire 3, and the connecting wire 3 may be provided with two, one connecting the first electrode 21, and the other connecting the second electrode 23. In the case where a plurality of convection devices 10 form an array, the piezoelectric devices 2 of two adjacent convection devices 10 may be electrically connected through the connecting wire 3, so as to realize the piezoelectric devices 2 of the two adjacent convection devices 10 being connected in series or in parallel. For example, the piezoelectric devices 2 of a plurality of convection devices 10 arranged in a row are connected in series.

[0072] Optionally, the convection device 10 may further include a circuit board FPC, the circuit board FPC is electrically connected to the connecting wire 3, so that the circuit board FPC is electrically connected to the piezoelectric device 2, and a voltage or current signal can be transmitted to the piezoelectric device 2 through the circuit board FPC. When the convection device 10 cooperates with the display panel, the circuit board FPC can be a circuit board with the main circuit board of the display panel, that is, the piezoelectric device 2 of the convection device 10 can be electrically connected to the main circuit board of the display panel.

[0073] It should be noted that the convection device 10 can be AM (Active Matrix) or PM (Passive Matrix) driven. The specific driving method and cascade method need to be combined with the actual number of convection devices 10 and the working scheme, which will not be repeated here.

[0074] In some example embodiments of the present disclosure, reference is made to Figure 1 , Figure 4-Figure 6 As shown, the air outlet 112 is arranged opposite to the piezoelectric device 2, and specifically, the air outlet 112 is arranged in the exhaust layer 114. In this way, when the elastic membrane layer 12 is concave inward due to vibration, the air in the convection cavity 1a will be blown out directly through the air outlet 112, avoiding the air in the convection cavity 1a to be blown out by turning, thereby improving the cooling effect. Of course, in some other exemplary embodiments of the present disclosure, the air outlet 112 can be arranged in the support layer 113.

[0075] Reference Figure 1 and Figure 4 As shown, the air inlet holes 13 may be provided in the elastic membrane layer 12 , so that when the elastic membrane layer 12 bulges outward due to vibration, cold air may directly enter the convection cavity 1 a through the air inlet holes 13 .

[0076] Reference Figure 5 and Figure 6 As shown, the air inlet 13 can also be provided on the support layer 113, avoiding the need to provide the air inlet 13 on the elastic film layer 12, thereby increasing the strength and vibration strength of the elastic film layer 12 and improving the cooling effect. In this case, the air inlet 13 can be provided as a bent channel, for example, in an "L" shape rotated 90 degrees; of course, the air inlet 13 can also be provided in an inclined straight line shape.

[0077] In this case, the distance between the edge line of the air inlet hole 13 close to the exhaust layer 114 and the exhaust layer 114 in the first direction X is the first distance, and the ratio of the first distance to the depth of the convection cavity 1a in the first direction is greater than or equal to 2 / 3 and less than or equal to 4 / 5. For example, the ratio of the first distance to the depth of the convection cavity 1a in the first direction can be 0.7, 0.72, 0.74, 0.75, 0.78, 0.79, etc. The number of holes per array is related to the fluid intake area. In the case that other structures are not changed, the exemplary embodiment requires the same Figure 1 and Figure 4 The example implementation shown requires a consistent total intake area.

[0078] Reference Figure 7 As shown, in some exemplary embodiments of the present disclosure, the convection cavity 1a may be configured in a circular shape, and the elastic membrane layer 12 may also be configured in a circular shape.

[0079] Of course, in some other example embodiments of the present disclosure, the convection chamber 1a can be set to a rectangular, elliptical, or other regular or irregular polygonal shape, the elastic membrane layer 12 can also be set to a rectangular, elliptical, or other regular or irregular polygonal shape, and the support layer 113 can be set to a rectangular ring, an elliptical ring, or other regular or irregular polygonal ring shape.

[0080] Reference Fig. 9 As shown, in some example embodiments of the present disclosure, the air inlet holes 13 can be set as circular through holes. Specifically, multiple air inlet holes 13 are evenly arranged on a circumference with the center of the circular convection cavity 1a as the center, so that the multiple air inlet holes 13 are centrally symmetrically arranged.

[0081] Of course, refer to Fig.10 As shown, the air inlet holes 13 can be set as long strip-shaped through holes. For example, when the convection chamber 1a is set as a circle, the air inlet holes 13 can be set as arc-shaped long strip-shaped through holes, and multiple air inlet holes 13 are evenly arranged on a circumference with the center of the circular convection chamber 1a as the center; when the convection chamber 1a is set as a rectangle, the air inlet holes 13 can be set as straight-line long strip-shaped through holes.

[0082] Reference Fig.11As shown, in some exemplary embodiments of the present disclosure, the air outlet 112 can be set as a circular through hole, for example, the center of one of the central air outlets 112 coincides with the center of the circular convection chamber 1a, and the remaining multiple air inlet holes 13 are evenly arranged on a virtual circle with the center of the circular convection chamber 1a as the center, and the virtual circle can be evenly spaced between the edge line of the central air outlet 112 and the edge line of the convection chamber 1a, so that the distance between the remaining multiple air inlet holes 13 and the central air outlet 112 is L1, and the distance between the remaining multiple air inlet holes 13 and the edge line of the convection chamber 1a is also L1. Through simulation calculation, when the number of air outlet holes 112 is greater than 9, the injection speed of a single air outlet 112 decreases significantly. Therefore, according to different scenarios and heat dissipation requirements, the maximum number of air outlet holes 112 is ≤9. For example, the number of air outlet holes 112 can be 3, 4, 5, 6, 7, or 8.

[0083] Of course, the air outlet holes 112 can be configured as various polygonal through holes.

[0084] In addition, the air inlet 13 can also be set to an ellipse or other regular or irregular polygon, and the air outlet 112 can also be set to an ellipse or other regular or irregular polygon, which will not be explained here one by one.

[0085] In order to achieve the best heat dissipation effect, the air flow ejected from the air outlet 112 needs to have a higher injection speed, that is, the higher the injection speed of the air flow ejected from the air outlet 112, the better the heat dissipation effect. The injection speed is affected by factors such as vibration frequency, vibration displacement, diameter of convection cavity 1a, and hole diameter. The following formula is the calculation formula for the injection speed u0(t).

[0086]

[0087] in,

[0088]

[0089] is the integral of the flow velocity over time t. According to the multilayer membrane vibration theory, the resonant frequency and vibration displacement of the piezoelectric layer 22 are related to the membrane thickness, diameter, etc.

[0090]

[0091] Where Δ is the vibration displacement, f is the operating frequency of the piezoelectric layer 22, ω is the Helmholtz resonance frequency of the convection cavity 1a, and S D0is the total area of ​​the air inlet 13; K=K1+K2, K1 is the thickness of the piezoelectric layer 22, K2 is the thickness of the elastic film layer 12; Dc is the diameter of the convection cavity 1a, D1 is the diameter of the air outlet 112; b is the diameter of the piezoelectric layer 22; n is the number of air outlets 112; T is the vibration period; H is the depth of the convection cavity 1a in the first direction X; h1 is the thickness of the exhaust layer 114; E E is the equivalent Young's modulus of the piezoelectric device 2 and the elastic film layer 12 after superposition, ρ E is the equivalent density of the piezoelectric device 2 and the elastic film layer 12 after superposition, σ E is the equivalent Poisson's ratio after the piezoelectric device 2 and the elastic membrane layer 12 are superimposed, which can be calculated by the existing calculation formula; E n , K n , σ n , n are respectively the Young's modulus, thickness, Poisson's ratio and density of the nth layer after the piezoelectric device 2 and the elastic film layer 12 are superimposed. In this structure, the first layer is the elastic film layer 12 and the second layer is the piezoelectric layer 22; d 31 is the piezoelectric constant of the piezoelectric layer 22, and V is the amplitude of the applied driving voltage.

[0092] Dimensions as Figure 1 As shown, the diameter of the air inlet 13 is D0, the diameter of the elastic membrane layer 12 is a, and the width of the support layer 113 is S1. It can also be said that the width of the support layer 113 between two adjacent convection cavities 1a is S1, which will not be explained one by one later.

[0093] It should be noted that the thickness of the piezoelectric device 2 is substantially the same as the thickness of the piezoelectric layer 22 , and the thickness of the first electrode 21 and the second electrode 23 can be ignored. The diameter of the piezoelectric device 2 is also the same as the diameter of the piezoelectric layer 22 .

[0094] According to the above formula, the relevant parameters of the convection device 10 can be calculated, and the selection range of the operating frequency can be determined according to the scene requirements; for example, in order to meet the requirements of ultra-thin, low noise and low power consumption, the operating frequency f of the piezoelectric layer 22 is selected to be 350kHz~550kHz. The above formula can be used to obtain that the depth of the convection cavity 1a in the first direction X is greater than or equal to 5 microns and less than or equal to 30 microns. For example, the depth of the convection cavity 1a in the first direction X can be 8 microns, 10 microns, 12 microns, 15 microns, 17 microns, 20 microns, 23 microns, 25 microns, 28 microns, etc.

[0095] In order to obtain the maximum injection velocity, it can be calculated that the ratio of the diameter of the air inlet hole 13 to the diameter of the air outlet hole 112 is greater than or equal to 0.5 and less than or equal to 1.5. For example, the ratio of the diameter of the air inlet hole 13 to the diameter of the air outlet hole 112 can be 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, etc.

[0096] The ratio of the diameter Dc of the convection cavity 1a to the depth H of the convection cavity 1a in the first direction X is greater than or equal to 5 and less than or equal to 15. For example, the ratio of the diameter of the convection cavity 1a to the depth of the convection cavity 1a in the first direction X can be 7, 9, 10, 12, 14, etc. The ratio of the diameter D1 of the air outlet hole 112 to the depth H of the convection cavity 1a in the first direction X is greater than or equal to 0.2 and less than or equal to 1. For example, the ratio of the diameter of the air outlet hole 112 to the depth of the convection cavity 1a in the first direction X can be 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, etc. The ratio range of the diameter of the convection cavity 1a to the diameter of the air outlet hole 112 can be obtained through the above values.

[0097] The piezoelectric layer 22 and the electrode layer (the first electrode 21 and the second electrode 23) will cause the elastic film layer 12 to have a stress zero position in the radial direction. If the piezoelectric layer 22 and the electrode layer (the first electrode 21 and the second electrode 23) exceed the stress zero position, vibration suppression will occur. Therefore, the size of the piezoelectric layer 22 should be selected according to the vibration mode of the elastic film layer 12, covering the stress boundary of the elastic film layer 12, and the stress boundary is the stress zero position of the elastic film layer 12; so as to maximize the driving effect, and the elastic film layer 12 and the piezoelectric layer 22 of different materials are selected, and the stress boundary position is different; specifically, the ratio of the diameter of the piezoelectric device 2 to the diameter of the elastic film layer 12 is greater than or equal to 0.6 and less than or equal to 0.9. For example, the ratio of the diameter of the piezoelectric device 2 to the diameter of the elastic film layer 12 can be 0.65, 0.7, 0.75, 0.8, 0.85, etc.

[0098] In the first direction X, the ratio of the thickness of the elastic membrane layer 12 to the thickness of the piezoelectric device 2 is greater than or equal to 0.2 and less than or equal to 0.8. For example, the ratio of the thickness of the elastic membrane layer 12 to the thickness of the piezoelectric device 2 can be 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, etc.

[0099] The thickness h1 of the exhaust layer 114 and the width S1 of the support layer 113 depend on the manufacturing process and material selection. The thickness h1 of the exhaust layer 114 is more than one times the diameter D1 of the exhaust hole 112. The ratio of the depth H of the convection cavity 1a in the first direction X to the width S1 of the support layer 113 is less than or equal to 20:1.

[0100] It should be noted that in the present disclosure, the first direction X is perpendicular to the elastic membrane layer 12 .

[0101] When the air inlet hole 13 is set to be a long strip, the ratio of the area of ​​a single air inlet hole 13 to the area of ​​the circular air outlet hole 112 is greater than or equal to 2. For example, the ratio of the area of ​​a single air inlet hole 13 to the area of ​​the circular air outlet hole 112 can be 2.3, 2.5, 2.8, 3, 3.2, 3.5, 3.8, 4, etc.

[0102] The distance between the edge of the air inlet 13 and the edge of the elastic membrane layer 12 is L0, the distance between the edge of the piezoelectric device 2 and the edge of the elastic membrane layer 12 is L, and the ratio of L0 to L is less than or equal to 1 / 3.

[0103] Reference Fig.12 and Fig.13 As shown, Fig.12 The orange curve in the middle is the driving voltage and power curve of the convection device, and the blue curve is the driving voltage and unidirectional average flow velocity curve of the convection device; Fig.13 RT-A means after room temperature, and RT-B means before room temperature; for example, Fig.13 It can be seen from the figure that when the temperature of the display panel is reduced from 80°C to 60°C, when the luminous efficiency of a single bead on the vertical axis is 40 (cd / A), the power of a single bead is reduced by about 8μW, and the power of the entire display panel is reduced by about 121mW. Fig.13 It can be obtained that when the power of the display panel is 121mW and the driving voltage is 1V, when the driving voltage is 1V, a unit of the convection device disclosed in the present invention can generate a jet speed of 12.5m / s for heat dissipation; referring to Figure 2 and Figure 3 As shown, when the jet speed of one unit of the convection device is 10 m / s, the temperature of the display panel is reduced from 87.6°C to 57.5°C, which is reduced by about 20°C; therefore, when the jet speed of one unit of the convection device is 12.5 m / s, the temperature of the display panel is reduced more, and thus, the power of the display panel is reduced more; it can be obtained that the power consumption of using the convection device of the present invention to achieve the jet speed requirement of 12.5 m / s is less than 121 mW, which is less than the additional power consumption of the display panel after the temperature increases; therefore, the use of the convection device of the present invention is beneficial to reducing power consumption.

[0104] Based on the same inventive concept, the exemplary embodiment of the present disclosure provides a display device, referring to Fig.14 and Fig.15 As shown, the display device may include a device to be cooled 20 and a convection device 10. The convection device 10 is any one of the convection devices 10 described above. The specific structure of the convection device 10 has been described in detail above, so it will not be repeated here.

[0105] The convection device 10 can be connected to the device to be cooled 20 through the connection layer 30. The connection layer 30 can be an adhesive material with certain viscosity and support such as adhesive material. The distance between the convection device 10 and the device to be cooled 20 is in the range of 10 microns to 50 microns.

[0106] The device to be cooled 20 may include a display panel, an integrated circuit (IC), a central processing unit (CPU), a graphics processing unit (GPU), etc.

[0107] When the device 20 to be cooled is a display panel, the convection device 10 is disposed on the non-display side of the display panel, and the air outlet 112 of the convection device 10 is disposed opposite to the non-display surface of the display panel.

[0108] The display panel can be a liquid crystal display panel, an OLED (Organic Light-Emitting Diode) display panel, a QLED (Quantum Dot Light Emitting Diodes) display panel, a micro-LED (micro-Light Emitting Diode) display panel, a mini-LED (mini-Light Emitting Diode) display panel, and the like.

[0109] The specific type of the display device is not particularly limited, and any type of display device commonly used in the field can be used, such as mobile devices such as mobile phones, wearable devices such as watches, VR devices, etc. Technical personnel in this field can make corresponding choices based on the specific purpose of the display device, which will not be repeated here.

[0110] It should be noted that, in addition to the device to be cooled 20 and the convection device 10, the display device also includes other necessary components and components, such as the housing, circuit board FPC, power cord, etc., taking the display as an example. Those skilled in the art can make corresponding supplements based on the specific use requirements of the display device, which will not be repeated here.

[0111] Compared with the prior art, the beneficial effects of the display device provided by the exemplary embodiment of the present invention are the same as the beneficial effects of the convection device 10 provided by the above exemplary embodiment, and are not described in detail herein.

[0112] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A convection device, characterized in that: include: A convection housing, comprising a main body and an elastic membrane layer, wherein the main body has a recessed portion, the elastic membrane layer is arranged on one side of the main body where the recessed portion is arranged, so that the recessed portion forms a convection cavity, the convection housing is provided with an air inlet hole, the main body is provided with an air outlet hole, and the air outlet hole is arranged opposite to the device to be cooled; The piezoelectric device is arranged on one side of the elastic membrane layer.

2. The convection device according to claim 1, characterized in that: The piezoelectric device is arranged on a side of the elastic film layer close to the main body, or the piezoelectric device is arranged on a side of the elastic film layer away from the main body.

3. The convection device according to claim 1, characterized in that: The air outlet is arranged opposite to the piezoelectric device.

4. The convection device according to claim 1, characterized in that: The main body comprises: A support layer, disposed on one side of the elastic membrane layer, wherein the support layer is arranged in a ring shape; The exhaust layer is arranged on a side of the support layer away from the elastic membrane layer.

5. The convection device according to claim 4, characterized in that: The air inlet hole is arranged in the elastic membrane layer, or the air inlet hole is arranged in the supporting layer.

6. The convection device according to claim 4, characterized in that: When the air inlet hole is arranged on the supporting layer, the distance between the edge line of the air inlet hole close to the exhaust layer and the exhaust layer in the first direction is a first distance, and the ratio of the first distance to the depth of the convection cavity in the first direction is greater than or equal to 2 / 3 and less than or equal to 4 / 5, and the first direction is perpendicular to the elastic membrane layer.

7. The convection device according to any one of claims 4 to 6, characterized in that: The depth of the convection chamber in the first direction is greater than or equal to 5 microns and less than or equal to 30 microns; And / or, the ratio of the diameter of the air inlet hole to the diameter of the air outlet hole is greater than or equal to 0.5 and less than or equal to 1.5, the ratio of the diameter of the convection cavity to the depth of the convection cavity in the first direction is greater than or equal to 5 and less than or equal to 15; the ratio of the diameter of the air outlet hole to the depth of the convection cavity in the first direction is greater than or equal to 0.2 and less than or equal to 1; And / or, the ratio of the diameter of the piezoelectric device to the diameter of the elastic membrane layer is greater than or equal to 0.6 and less than or equal to 0.9; in the first direction, the ratio of the thickness of the elastic membrane layer to the thickness of the piezoelectric device is greater than or equal to 0.2 and less than or equal to 0.8; And / or, the thickness of the exhaust layer is more than one times the diameter of the air outlet, the ratio of the depth of the convection cavity in the first direction to the width of the support layer is less than or equal to 20:1, and the first direction is perpendicular to the elastic membrane layer.

8. The convection device according to claim 1, characterized in that The air inlet is arranged in a strip shape, and the ratio of the area of ​​the air inlet to the area of ​​the circular air outlet is greater than or equal to 2; The distance between the edge of the air inlet and the edge of the elastic membrane layer is L0, the distance between the edge of the piezoelectric device and the edge of the elastic membrane layer is L, and the ratio of L0 to L is less than or equal to 1 / 3.

9. The convection device according to claim 1, characterized in that: The number of the air outlet holes is less than or equal to 9.

10. A display device, characterized in that: include: Device to be cooled; The convection device is the convection device according to any one of claims 1 to 9.

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