Liquid heat dissipation backlight module and vehicle-mounted display device

Abstract

The utility model provides a liquid heat dissipation backlight module, which comprises a lower frame, the lower frame comprises a bottom plate, a side frame and a sealing element, the bottom plate comprises a first surface and a second surface which are oppositely arranged, the side frame is fixedly connected to the first surface, the second surface is recessed towards the direction close to the first surface to form a cavity, and the sealing element is fixedly connected to the side frame. The sealing element covers the cavity, the sealing element is provided with a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are respectively communicated with the cavity, cooling liquid is arranged in the cavity, and the cooling liquid is used for cooling the backlight module. And the liquid inlet and the liquid outlet are used for liquid circulation of the cooling liquid. According to the liquid heat dissipation backlight module, the passing rate of a vehicle gauge strict reliability experiment can be improved, the stability of a product is improved, and the visual effect is optimized. The utility model further relates to a vehicle-mounted display device.

Description

Technical Field

[0001] The utility model relates to the technical field of display screens, in particular to a liquid heat dissipation backlight module and a vehicle-mounted display device. Background Art

[0002] Intelligent society The application of display screens is becoming more and more extensive. With the popularization of new energy vehicles, the demand for high-brightness backlight electronic products in vehicles has also steadily increased. In addition, more and more electronic products are used in daily life. New models often require backlight vehicle structures with brightness requirements greater than 130,000 cd / ㎡. Vehicle-mounted Local Dimming_COB high-brightness backlight products usually have large-size display screens with brightness requirements greater than 130,000 cd / ㎡. At the same time, the reliability test requirements of vehicle regulations are high, especially in vehicle-mounted display screen products. There are strict reliability requirements of high temperature and high humidity for 500 hours and 300 cycles of hot and cold shocks. Conventional backlight modules dissipate heat through the thermal conductive double-sided adhesive of the light board. In different thermal expansion and contraction environments, it is easy to have high product temperatures, resulting in high-brightness backlight module products, the risk of melting other parts, affecting the display effect, and other undesirable phenomena. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a liquid heat dissipation backlight module, which can improve the passing rate of strict reliability tests of automotive regulations, improve product stability, and optimize visual effects.

[0004] The utility model provides a backlight module for liquid heat dissipation, comprising a lower frame, the lower frame comprising a bottom plate, a side frame, and a sealing member, the bottom plate comprising a first surface and a second surface arranged opposite to each other, the side frame being fixedly connected to the first surface, the second surface being recessed toward a direction close to the first surface to form a cavity, the sealing member covering the cavity, the sealing member being provided with a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet being respectively connected to the cavity, a cooling liquid being arranged in the cavity, the cooling liquid being used for dissipating heat to the backlight module, and the liquid inlet and the liquid outlet being used for liquid circulation of the cooling liquid.

[0005] In one embodiment, the sealing member includes a sealing plate and a first sealing ring, the sealing plate is fixedly connected with a first connecting tube and a second connecting tube, the first connecting tube and the second connecting tube are arranged on a side of the sealing plate away from the bottom plate, the first connecting tube is connected to the liquid inlet, and the second connecting tube is connected to the liquid outlet.

[0006] In one embodiment, a sealing groove is provided at one end of the bottom plate away from the first surface, the sealing groove is circumferentially arranged around the bottom plate, the first sealing ring is arranged in the sealing groove, and when the sealing plate is fixedly connected to the bottom plate, the first sealing ring is located between the sealing plate and the bottom plate.

[0007] In one embodiment, the seal also includes a plurality of fasteners, each fastener is used to connect the sealing plate and the base plate, the fastener is provided with a second sealing ring, the second sealing ring is sleeved on the fastener, and the sealing ring is located on the side of the sealing plate away from the base plate.

[0008] In one embodiment, a plurality of vertical plates are provided in the cavity, and the vertical plates are spaced apart from each other. Each of the vertical plates divides the cavity into a plurality of regions, and the regions are interconnected. The coolant is distributed in each of the regions.

[0009] In one embodiment, the liquid heat dissipation backlight module further includes a light board, which is disposed on the bottom plate and is electrically connected to a control system of the vehicle-mounted display device via a connector.

[0010] In one embodiment, the base plate is provided with a first avoidance hole, and the sealing plate is provided with a second avoidance hole. The first avoidance hole and the second avoidance hole are used to avoid the connector of the lamp board. The base plate is fixedly connected with a baffle, and the baffle is circumferentially arranged around the first avoidance hole. The baffle can prevent the coolant in the cavity from flowing out of the first avoidance hole.

[0011] In one embodiment, the sealing member further includes a third sealing ring, which is circumferentially arranged around the first avoidance hole and is arranged between the bottom plate and the sealing plate.

[0012] In one embodiment, the liquid heat dissipation backlight module further includes a reflective film, a light guide plate and an optical film, wherein the reflective film is arranged on the first surface of the base plate, the light guide plate is arranged on the reflective film, and the optical film is arranged on the light guide plate.

[0013] The utility model also relates to a vehicle-mounted display device, comprising the above-mentioned liquid heat dissipation backlight module.

[0014] The backlight module of the utility model is provided with a cavity on the lower frame, and the cavity is filled with coolant. The coolant in the cavity is circulated through the liquid inlet and the liquid outlet to achieve heat dissipation of the backlight module. This can improve the pass rate of reliability tests that are strict with automotive regulations, improve product stability, avoid high temperature of the backlight module from scalding other parts, and optimize the visual effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a schematic diagram of the disassembled structure of the backlight module of the first embodiment of the utility model;

[0017] Figure 2 is a schematic diagram of the disassembled structure of the backlight module of the first embodiment of the utility model from another viewing angle;

[0018] Explanation of the accompanying reference numerals: cavity 101; liquid inlet 102; liquid outlet 103; sealing groove 104; first avoidance hole 105; second avoidance hole 106; lower frame 11; bottom plate 111; side frame 112; sealing plate 1131; first sealing ring 1132; fastener 1133; second sealing ring 1134; baffle 114; first connecting tube 115; second connecting tube 116; lamp board 12; light guide plate 14; optical film 15; diffusion film 151; brightness enhancement film 152; brightness enhancement touch 153; middle frame 16; foam glue 17.

[0019] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0020] The following will describe in detail a specific embodiment of the utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all of the embodiments. Based on the description of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] In the description of the present utility model, unless otherwise clearly specified and limited, the terms "set", "install", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0022] The directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the utility model.

[0023] The terms "first", "second", "third", etc. are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0024] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0025] like Figure 1 and Figure 2 As shown, the liquid heat dissipation backlight module includes a lower frame 11, and the lower frame 11 includes a bottom plate 111, a side frame 112, and a sealing member. The bottom plate 111 includes a first surface and a second surface that are oppositely arranged. The side frame 112 is fixedly connected to the first surface, and the second surface is recessed toward the direction close to the first surface to form a cavity 101. The sealing member is arranged to cover the cavity 101, and the sealing member is provided with a liquid inlet 102 and a liquid outlet 103, and the liquid inlet 102 and the liquid outlet 103 are respectively connected to the cavity 101. A cooling liquid is provided in the cavity 101, and the cooling liquid is used to dissipate the heat of the backlight module. The liquid inlet 102 and the liquid outlet 103 are used to circulate the cooling liquid to dissipate the heat of the backlight module and improve the stability of the backlight module.

[0026] The backlight module of the utility model is provided with a cavity 101 on the lower frame 11, and the cavity 101 is filled with coolant. The coolant in the cavity 101 is circulated through the liquid inlet 102 and the liquid outlet 103 to achieve heat dissipation of the backlight module, which can improve the pass rate of the reliability test that is strict with automotive regulations, improve the stability of the product, avoid high temperature of the backlight module from scalding other parts, and optimize the visual effect.

[0027] Preferably, the sealing member includes a sealing plate 1131 and a first sealing ring 1132, the sealing plate 1131 is fixedly connected with a first connecting tube 115 and a second connecting tube 116, the first connecting tube 115 and the second connecting tube 116 are arranged on a side of the sealing plate 1131 away from the bottom plate 111, the first connecting tube 115 is connected to the liquid inlet 102, and the second connecting tube 116 is connected to the liquid outlet 103, the coolant enters the cavity 101 through the first connecting tube 115 and the liquid inlet 102, and then exits the cavity 101 through the liquid outlet 103 and the second connecting tube 116, the first connecting tube 115 and the second connecting tube 116 are connected to the cooling system of the vehicle to realize the circulation of the coolant, thereby achieving the effect of heat dissipation; wherein, the first connecting tube 115, the second connecting tube 116 and the sealing plate 1131 are an integrated structure, the first connecting tube 115 is preferably a cylindrical hollow structure, and the second connecting tube 116 is preferably a cylindrical hollow structure.

[0028] Preferably, a sealing groove 104 is provided at one end of the bottom plate 111 away from the first surface, and the sealing groove 104 is circumferentially arranged around the bottom plate 111. The first sealing ring 1132 is arranged in the sealing groove 104, wherein the first sealing ring 1132 is an annular structure, the shape of the first sealing ring 1132 is adapted to the shape of the sealing groove 104, and the first sealing ring 1132 is preferably an integral structure, and when the sealing plate 1131 is fixedly connected to the bottom plate 111, the first sealing ring 1132 is located between the sealing plate 1131 and the bottom plate 111. Among them, the sealing member also includes multiple fasteners 1133, each fastener 1133 is used to connect the sealing plate 1131 and the base plate 111, the fastener 1133 is preferably a bolt or a screw, etc., the fastener 1133 is provided with a second sealing ring 1134, the second sealing ring 1134 is sleeved on the fastener 1133, the second sealing ring 1134 is located on the side of the sealing plate 1131 away from the base plate 111, the second sealing ring 1134 can make the fastener 1133 and the base plate 111 tightly connected to avoid the fastener 1133 falling off during the experimental vibration process or use of the backlight module, thereby avoiding the problem of cooling liquid leakage in the cavity 101; the first sealing ring 1132 is preferably rubber or silicone, etc., and the second sealing ring 1134 is preferably rubber or silicone, etc., but is not limited to this.

[0029] Preferably, the liquid heat dissipation backlight module also includes a light board 12, which is arranged on the base plate 111, and the light board 12 is electrically connected to the control system of the vehicle display device through a connector; the light board 12 includes a flexible circuit board and multiple LED lights, and the multiple LED lights are electrically connected to the flexible circuit board, and each LED light is arranged along the length direction of the flexible circuit board.

[0030] Preferably, the bottom plate 111 is provided with a first avoidance hole 105, and the sealing plate 1131 is provided with a second avoidance hole 106. The first avoidance hole 105 and the second avoidance hole 106 are used to avoid the connector of the light board 12. The bottom plate 111 is fixedly connected with a baffle 114, and the baffle 114 is circumferentially arranged around the first avoidance hole 105. The baffle 114 can prevent the coolant in the cavity 101 from flowing out of the first avoidance hole 105, thereby affecting the display effect of the backlight module.

[0031] Preferably, the seal also includes a third sealing ring, which is circumferentially arranged around the first avoidance hole 105 and is arranged between the bottom plate 111 and the sealing plate 1131. The third sealing ring is used to seal the cavity 101 to prevent the coolant in the cavity 101 from flowing out of the first avoidance hole 105 or the second avoidance hole 106, thereby affecting the display effect of the backlight module and improving the stability of the product; the third sealing ring is preferably rubber or silicone, but is not limited to this.

[0032] Preferably, the backlight module of liquid heat dissipation further includes a reflective film, a light guide plate 14 and an optical film 15, wherein the reflective film is arranged on the first surface of the bottom plate 111, the light guide plate 14 is arranged on the reflective film, and the optical film 15 is arranged on the light guide plate 14. In this embodiment, the optical film 15 includes a diffusion film 151, a light enhancement film 152 and a brightness enhancement film 153, wherein the diffusion film 151 is arranged on the light guide plate 14, the brightness enhancement film 152 is arranged on the diffusion film 151, and the brightness enhancement film 153 is arranged on the brightness enhancement film 152. Among them, the diffusion film 151 is fixedly connected to the light guide plate 14 by double-sided adhesive tape, and the diffusion film 151, the brightness enhancement film 152 and the brightness enhancement film 153 can be fixedly connected by double-sided adhesive tape. Or the positioning is performed by means of a card block and a card slot, and then the double-sided adhesive tape is used for pasting and fixing, so as to increase the firmness of the connection between the films.

[0033] Preferably, the liquid heat dissipation backlight module also includes a middle frame 16 and foam glue 17. The middle frame 16 is fixedly connected to the lower frame 11 through the cooperation of the fixing block and the fixing groove. The foam glue 17 is fixedly connected to the middle frame 16. The foam glue 17 is used to buffer and fix the display screen.

[0034] Second embodiment

[0035] The liquid heat dissipation backlight module of this embodiment is substantially the same in structure as the liquid heat dissipation backlight module of the first embodiment, except that the structure inside the cavity 101 is different.

[0036] Specifically, a plurality of vertical plates are provided in the cavity 101, and the vertical plates are spaced apart from each other. Each vertical plate divides the cavity 101 into a plurality of areas, and the areas are interconnected. The coolant is distributed in each area to ensure that the coolant can flow and circulate in each area, so as to reduce abnormal noise caused by violent shaking of the coolant due to vibration during reliability testing or use of the backlight module.

[0037] The utility model also relates to a vehicle-mounted display device, including the above-mentioned liquid heat dissipation backlight module. The vehicle-mounted display device of the utility model is, for example, a high-end vehicle-mounted instrument, a vehicle-mounted central control display, a vehicle-mounted driving recorder, a vehicle-mounted DVD navigation, etc., but is not limited thereto.

[0038] The above are only specific implementations of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the attached claims.

Claims

1. A liquid heat dissipation backlight module, characterized in that: The invention comprises a lower frame (11), wherein the lower frame (11) comprises a bottom plate (111), a side frame (112), and a sealing member; the bottom plate (111) comprises a first surface and a second surface which are arranged opposite to each other; the side frame (112) is fixedly connected to the first surface; the second surface is recessed in a direction close to the first surface to form a cavity (101); the sealing member is arranged to cover the cavity (101); the sealing member is provided with a liquid inlet (102) and a liquid outlet (103); the liquid inlet (102) and the liquid outlet (103) are respectively connected to the cavity (101); a cooling liquid is provided in the cavity (101); the cooling liquid is used to dissipate heat from the backlight module; the liquid inlet (102) and the liquid outlet (103) are used to circulate the cooling liquid.

2. The liquid heat dissipation backlight module according to claim 1, characterized in that: The sealing component comprises a sealing plate (1131) and a first sealing ring (1132); the sealing plate (1131) is fixedly connected with a first connecting tube (115) and a second connecting tube (116); the first connecting tube (115) and the second connecting tube (116) are arranged on a side of the sealing plate (1131) away from the bottom plate (111); the first connecting tube (115) is connected to the liquid inlet (102), and the second connecting tube (116) is connected to the liquid outlet (103).

3. The liquid heat dissipation backlight module according to claim 2, characterized in that: A sealing groove (104) is provided at one end of the bottom plate (111) away from the first surface. The sealing groove (104) is circumferentially arranged around the bottom plate (111). The first sealing ring (1132) is arranged in the sealing groove (104). When the sealing plate (1131) is fixedly connected to the bottom plate (111), the first sealing ring (1132) is located between the sealing plate (1131) and the bottom plate (111).

4. The liquid heat dissipation backlight module according to claim 3, characterized in that: The sealing member further comprises a plurality of fasteners (1133), each of the fasteners (1133) being used to connect the sealing plate (1131) and the bottom plate (111), and the fasteners (1133) are provided with a second sealing ring (1134), the second sealing ring (1134) being sleeved on the fasteners (1133), and the second sealing ring (1134) being located on a side of the sealing plate (1131) away from the bottom plate (111).

5. The liquid heat dissipation backlight module according to claim 3, characterized in that: A plurality of vertical plates are arranged in the cavity (101), and the vertical plates are arranged at intervals. The vertical plates divide the cavity (101) into a plurality of regions, and the regions are interconnected. The coolant is distributed in each region.

6. The liquid heat dissipation backlight module according to claim 4 or 5, characterized in that: The liquid heat dissipation backlight module further comprises a light board (12), wherein the light board (12) is arranged on the base plate (111), and the light board (12) is electrically connected to a control system of the vehicle-mounted display device via a connector.

7. The liquid heat dissipation backlight module according to claim 6, characterized in that: The bottom plate (111) is provided with a first avoidance hole (105), and the sealing plate (1131) is provided with a second avoidance hole (106). The first avoidance hole (105) is used to avoid the connector of the lamp board (12). The bottom plate (111) is fixedly connected with a baffle (114), and the baffle (114) is circumferentially arranged around the first avoidance hole (105). The baffle (114) can prevent the coolant in the cavity (101) from flowing out of the first avoidance hole (105).

8. The liquid heat dissipation backlight module according to claim 7, characterized in that: The sealing member further comprises a third sealing ring, which is circumferentially arranged around the first avoidance hole (105), and the third sealing ring is arranged between the bottom plate (111) and the sealing plate (1131).

9. The liquid heat dissipation backlight module according to claim 8, characterized in that: The liquid heat dissipation backlight module further comprises a reflective film, a light guide plate (14) and an optical film (15); the reflective film is arranged on the first surface of the bottom plate (111), the light guide plate (14) is arranged on the reflective film, and the optical film (15) is arranged on the light guide plate (14).

10. A vehicle-mounted display device, characterized in that: A backlight module comprising the liquid heat dissipation as claimed in any one of claims 1 to 9.

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