Backlight module and liquid crystal display device

Abstract

The utility model relates to the technical field of display devices, and discloses a backlight module and a liquid crystal display device. The liquid crystal display device comprises a backlight module and a liquid crystal display panel, the backlight module comprises a back plate, a light bar and a heat dissipation assembly, the back plate comprises a bottom plate and a side plate, and the side plate is perpendicular to the bottom plate; the lamp strip comprises a substrate and a plurality of lamp beads, the substrate is installed on the inner side of the side plate, and the lamp beads are arranged on the substrate at intervals; the heat dissipation assembly comprises a heat dissipation part and a heat absorption part connected with the heat dissipation part, the heat dissipation part is arranged on the outer side of the bottom plate, and the heat absorption part penetrates through the bottom plate and extends into the position between every two adjacent lamp beads. According to the backlight module and the liquid crystal display device, heat generated by the lamp beads can be dissipated to the outside of the back plate, the problem that a black screen occurs due to the fact that the temperature of a liquid crystal display panel installed above the back plate module is too high is solved, and the temperature of the backlight module can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to display technical field especially relates to a backlight module and liquid crystal display device. BACKGROUND

[0002] The liquid crystal display device has the advantages of low operating voltage, light weight and small size, and is widely used in the fields of household appliances and automobiles. The liquid crystal display device includes a backlight module and a liquid crystal display panel. The backlight module provides a light source for the liquid crystal display panel. Meanwhile, the liquid crystal display panel changes the orientation of liquid crystal molecules by changing the electric field strength applied to the liquid crystal molecules, controls the intensity of light transmission, and thus realizes the display of images.

[0003] Figure 1 is a structural schematic diagram of a liquid crystal display device disclosed by the prior art. As shown in Figure 1 , the liquid crystal display device includes a backlight module 10', a middle frame 20' and a liquid crystal display panel 30'. The backlight module 10' includes a back plate 11', a light bar 12', a light guide plate 13' and an optical film 14'. The back plate 11' includes a bottom plate 111' and a side plate 112' surrounding the four sides of the bottom plate 111'. The light guide plate 13' and the optical film 14' are sequentially stacked on the bottom plate 111'. The light bar 12' includes a substrate 121' and a plurality of lamp beads 122' arranged on the substrate 121'. The substrate 121' is adhered to the inner side of the side plate 112', and each lamp bead 122' is opposite to the light guide plate 13'. The middle frame 20' is supported above the back plate 11', the liquid crystal display panel 30' is overlapped on the middle frame 20', and the edges of the liquid crystal display panel 30' are above the lamp beads 122'.

[0004] In some application scenarios, the liquid crystal display device has a high brightness requirement. Therefore, the number of lamp beads 122' is large and dense, and thus a large amount of heat is generated. The temperature around the light bar 12' may exceed the temperature that the liquid crystal can withstand, resulting in the phenomenon of liquid crystal liquefaction black screen at the edges of the liquid crystal display panel 30'.

[0005] Therefore, there is an urgent need for a backlight module and a liquid crystal display device to solve the above technical problems. INVENTION CONTENTS

[0006] An object of the utility model is to provide a backlight module which can dissipate the heat generated by the lamp beads to the outside of the back plate, reduce the temperature of the backlight module, and avoid the temperature of the liquid crystal display panel installed above the back plate module being too high.

[0007] To achieve this object, the utility model adopts the following technical solutions:

[0008] The backlight module comprises:

[0009] A backboard comprises a bottom plate and side plates which are arranged perpendicularly to the bottom plate;

[0010] A light bar comprises a substrate and a plurality of lamp beads, the substrate is mounted on the inner side of the side plate, and the plurality of lamp beads are arranged on the substrate at intervals;

[0011] A heat dissipation assembly comprises a heat dissipation part and a heat absorption part connected with the heat dissipation part, the heat dissipation part is arranged on the outer side of the bottom plate, and the heat absorption part penetrates through the bottom plate and extends into the space between two adjacent lamp beads.

[0012] As an optional solution, the heat absorption part comprises a heat-conducting base and a heat-absorbing coating, the heat-conducting base penetrates through the bottom plate and is connected with the heat dissipation part, and the heat-absorbing coating is wrapped on the outer side of the heat-conducting base.

[0013] As an optional solution, the heat dissipation assembly comprises a plurality of heat absorption parts, and the heat absorption part is arranged between two adjacent lamp beads.

[0014] As an optional solution, the heat dissipation part surrounds the outer periphery of the end of the heat absorption part away from the lamp beads.

[0015] As an optional solution, in the direction perpendicular to the substrate, the thickness of the heat absorption part is greater than the thickness of the lamp beads.

[0016] As an optional solution, the heat dissipation assembly is adhesively connected with the bottom plate.

[0017] Another purpose of the utility model lies in providing a liquid crystal display device, through adopting the backlight module, the liquid crystal display panel is not prone to the problem of edge black screen, and has low failure rate and long service life.

[0018] To achieve the purpose, the utility model adopts the following technical scheme:

[0019] The liquid crystal display device comprises a liquid crystal display panel, a middle frame and the backlight module, the middle frame is supported on the side plate, and the liquid crystal display panel is supported on the upper side of the middle frame.

[0020] As an optional solution, the middle frame comprises a horizontal plate and a vertical plate, the horizontal plate is supported on the side plate, the vertical plate is located on the outer side of the side plate, the backlight module further comprises a first heat insulation layer, and the first heat insulation layer is arranged on the lower side of the horizontal plate and located on the upper side of the light bar.

[0021] As an optional solution, the backlight module further comprises a light guide plate and an optical film, the light guide plate is arranged on the bottom plate and opposite to the lamp beads on one side, and the optical film is arranged on the light guide plate;

[0022] The first heat insulation layer comprises a first heat insulation part and a second heat insulation part, the first heat insulation part is supported on the light guide plate and located on the side of the optical film piece facing the lamp strip, and the second heat insulation part is connected to the upper end of the first heat insulation part and adheres to the lower side of the transverse plate.

[0023] As an optional solution, the liquid crystal display device further comprises a second heat insulation layer, which is arranged between the middle frame and the liquid crystal display panel.

[0024] The utility model has the advantages that:

[0025] The heat dissipation part of the heat dissipation assembly is located on the outer side of the bottom plate, the heat absorption part penetrates the bottom plate and extends between the two adjacent lamp beads, when the lamp beads generate heat, the heat absorption part absorbs the heat and conducts the heat to the heat dissipation part located on the outer side of the bottom plate through heat conduction, the heat dissipation part further exchanges heat with the external environment, so that the heat near the lamp strip is conducted to the outer side of the back plate, heat accumulation near the lamp beads is avoided, not only the temperature of the liquid crystal display panel above the lamp beads is prevented from being too high, the liquid crystal display panel is prevented from black screen due to liquid crystal liquefaction, but also the light guide plate, the optical film piece and other components are prevented from being damaged due to overheating.

[0026] The liquid crystal display device has the advantages that the temperature of the liquid crystal display panel above the lamp beads is prevented from being too high, the liquid crystal display panel is prevented from black screen due to liquid crystal liquefaction, and the service life of the liquid crystal display is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a partial sectional view of the liquid crystal display device provided by the prior art;

[0028] Figure 2 is a partial sectional view of the liquid crystal display device provided by the embodiment of the utility model;

[0029] Figure 3 is a structural schematic view of the cooperation of the back plate, the lamp strip and the heat dissipation assembly provided by the embodiment of the utility model;

[0030] Figure 4 is a structural schematic view of the heat dissipation assembly provided by the embodiment of the utility model.

[0031] In the drawings:

[0032] 10', backlight module;11', back plate;111', bottom plate;112', side plate;12', lamp strip;121', substrate;122', lamp bead;13', light guide plate;14', optical film piece;20', middle frame;30', liquid crystal display panel;

[0033] 10, backlight module;

[0034] 11, back plate; 111, bottom plate; 112, side plate; 113, through hole;

[0035] 12, light bar; 121, substrate; 122, lamp bead;

[0036] 13, light guide plate;

[0037] 14, optical film;

[0038] 15, heat dissipation assembly; 151, heat dissipation part; 152, heat absorption part; 1521, heat conduction base body; 1522, heat absorption coating;

[0039] 20, middle frame; 21, horizontal plate; 22, vertical plate;

[0040] 30, liquid crystal display panel;

[0041] 40, first heat insulation layer; 41, first heat insulation part; 42, second heat insulation part;

[0042] 50, second heat insulation layer. DETAILED DESCRIPTION

[0043] The utility model will be described in further detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0044] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0045] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature in the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature in the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature in the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0046] In the description of the embodiments, the terms "upper", "lower", "right", "left", and the like, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only used to distinguish in the description, and have no special meaning.

[0047] The embodiment provides a backlight module and a liquid crystal display device, Figure 2 is a partial sectional view of the liquid crystal display device provided by the embodiment, as Figure 2 shown, the liquid crystal display device comprises a backlight module 10, a middle frame 20 and a liquid crystal display panel 30. Among them, the middle frame 20 is installed on the upper side of the backlight module 10, and the liquid crystal display panel 30 is supported on the middle frame 20, that is, the liquid crystal display module, the middle frame 20 and the liquid crystal display panel 30 are arranged along the first direction.

[0048] Figure 3 is a structural schematic view of the cooperation of the back plate, the lamp strip and the heat dissipation assembly provided by the embodiment; as Figure 2 and Figure 3 shown, the backlight module 10 comprises a back plate 11, a lamp strip 12, a light guide plate 13 and an optical film 14, the back plate 11 comprises a bottom plate 111 and a side plate 112, the bottom plate 111 is perpendicular to the first direction, and the side plate 112 is arranged at one end of the bottom plate 111 along the second direction, and the side plate 112 is perpendicular to the second direction, and the second direction is perpendicular to the first direction. The lamp strip 12 comprises a substrate 121 and a plurality of lamp beads 122, the substrate 121 extends along the third direction and is installed on the inner side of the side plate 112, and the plurality of lamp beads 122 are arranged on the substrate 121 along the third direction, and the third direction is perpendicular to the first direction and the second direction respectively. The light guide plate 13 is arranged on the bottom plate 111 and one side is opposite to the lamp bead 122, and the optical film 14 is arranged on the light guide plate 13. The middle frame 20 comprises a horizontal plate 21 and a vertical plate 22, the horizontal plate 21 is supported on the side plate 112, and the vertical plate 22 is located outside the side plate 112. The liquid crystal display panel 30 is supported on the horizontal plate 21, thereby being located above the optical film 14. The light emitted by the lamp bead 122 is conducted through the light guide plate 13 and processed through the optical film 14 and then irradiated onto the liquid crystal display panel 30.

[0049] For the liquid crystal display device with high brightness display requirement, the number of lamp beads 122 is large and dense, so more heat will be generated, and the temperature around the lamp strip 12 may exceed the temperature that the liquid crystal can withstand, resulting in the phenomenon of liquid crystal liquefaction black screen at the edge of the liquid crystal display panel 30.

[0050] as Figure 2 and Figure 3As shown, the backlight module 10 further comprises a heat dissipation assembly 15, the heat dissipation assembly 15 comprises a heat dissipation part 151 and a heat absorption part 152, the heat dissipation part 151 is connected with the heat absorption part 152, the heat dissipation part 151 is arranged outside the bottom plate 111 (i.e. the lower side of the bottom plate 111), and the heat absorption part 152 penetrates the bottom plate 111 and extends into the space between two adjacent lamp beads 122. When the lamp beads 122 generate heat, the heat absorption part 152 absorbs the heat and conducts the heat to the heat dissipation part 151 outside the bottom plate 111 through heat conduction, and the heat dissipation part 151 further exchanges heat with the external environment, so as to conduct the heat near the lamp strip 12 to the outside of the back plate 11, avoiding the accumulation of heat near the lamp beads 122, not only avoiding the temperature of the liquid crystal display panel 30 above the lamp beads 122 being too high, preventing the liquid crystal of the liquid crystal display panel 30 from liquefying and black screen, but also avoiding the damage of the light guide plate 13, the optical film 14 and other components due to overheating.

[0051] As shown in Figure 3 , the heat dissipation assembly 15 comprises a plurality of heat absorption parts 152, the plurality of heat absorption parts 152 are arranged at intervals along the third direction, and the heat absorption part 152 is arranged between each two adjacent lamp beads 122, the plurality of heat absorption parts 152 can respectively absorb the heat near each lamp bead 122, and dissipate the heat to the outside of the back plate 11 through the heat dissipation part 151, so as to ensure that each position of the lamp strip 12 extending along the third direction is reliably cooled. In the embodiment, a through hole 113 is arranged between each two adjacent lamp beads 122 on the bottom plate 111, and each heat absorption part 152 penetrates a through hole 113 to extend into the space between the two lamp beads 122.

[0052] As shown in Figure 3 , along the direction perpendicular to the substrate 121, i.e. along the second direction, the thickness of the heat absorption part 152 is greater than the thickness of the lamp bead 122, by setting the size of the heat absorption part 152 to be larger, the heat generated by the lamp bead 122 can be more fully absorbed, and the cooling effect is ensured. In other embodiments (not shown), the thickness of the heat absorption part 152 along the second direction can also be less than or equal to the thickness of the lamp bead 122.

[0053] Figure 4 is a structural schematic diagram of the heat dissipation assembly provided by the embodiment, as shown in Figure 3 and Figure 4 , in the embodiment, the plurality of heat absorption parts 152 are connected with the heat dissipation part 151, by such arrangement, when the heat dissipation part 151 is installed on the bottom plate 111, each heat absorption part 152 is simultaneously installed on the bottom plate 111, thereby improving the convenience of installation of the entire heat dissipation assembly 15. Of course, in some embodiments (not shown), each heat absorption part 152 can be correspondingly provided with a heat dissipation part 151, or several of the plurality of heat absorption parts 152 can share a heat dissipation part 151, which is not specifically limited here.

[0054] AsFigure 3 and Figure 4 As shown in FIG. 1, the heat dissipation part 151 is plate-shaped and is attached to the outer side of the bottom plate 111. In this way, the heat dissipation part 151 has a larger area to exchange heat with the outside, thereby improving the heat dissipation effect of the entire heat dissipation assembly 15 on the lamp beads 122, and further more reliably avoiding the problem of black screen of the liquid crystal display panel 30, and preventing the optical film 14 or the light guide plate 13 from being overheated and damaged. In this embodiment, the heat absorption part 152 is arranged at the middle position of the heat dissipation part 151, that is, the heat dissipation part 151 is arranged around the outer periphery of the lower end of the heat absorption part 152. In this way, not only the heat absorption part 152 can quickly and uniformly conduct heat to the heat dissipation part 151, but also the heat dissipation part 151 can shield the through hole 113, thereby avoiding the problem of light leakage at the through hole 113. In this embodiment, the heat dissipation part 151 is configured in a strip shape, and in other embodiments, the specific shape of the heat dissipation part 151 is not limited.

[0055] In this embodiment, the heat dissipation assembly 15 is adhesively connected with the bottom plate 111. The adhesive connection is convenient to assemble and is conducive to ensuring the sealing of the backlight module 10. Alternatively, the heat dissipation part 151 is adhesively connected with the outer side of the bottom plate 111 by double-sided adhesive tape. Of course, in order to further improve the firmness of the connection, glue can also be filled in the gap between the through hole 113 and the heat absorption part 152. Alternatively, the glue can be light-blocking glue, which can also play a role in preventing light leakage.

[0056] As shown in FIG. 1, Figure 3 The heat absorption part 152 includes a heat-conducting base 1521 and a heat-absorbing coating 1522. The heat-conducting base 1521 penetrates the bottom plate 111 and is connected with the heat dissipation part 151, and the heat-absorbing coating 1522 covers the outside of the heat-conducting base 1521. The heat-absorbing coating 1522 is a material with high heat absorption efficiency, which can quickly absorb the heat emitted by the lamp beads 122. The heat-conducting base 1521 and the heat dissipation part 151 are both made of a material with high thermal conductivity, thereby facilitating the quick dissipation of the heat generated by the lamp beads 122 to the outside of the back plate 11, and ensuring high heat dissipation efficiency. In this embodiment, the heat-absorbing coating 1522 can be a black chromium coating or a silicon carbide-based composite material coating. The heat-conducting base 1521 and the heat dissipation part 151 are integrally formed and can be made of copper or graphite material.

[0057] As shown in FIG. 1, Figure 2 The backlight module 10 further includes a first heat insulation layer 40, which is arranged on the lower side of the horizontal plate 21 and on the upper side of the lamp strip 12. By arranging the first heat insulation layer 40, the heat generated by the lamp beads 122 can be blocked from being conducted to the liquid crystal display panel 30, thereby better preventing the liquid crystal in the liquid crystal display panel 30 from being liquefied and avoiding the problem of black screen. Alternatively, the first heat insulation layer 40 can be made of glass fiber, asbestos or silicate material, which is not limited here.

[0058] As Figure 2 shown, the optical film 14 is smaller than the light guide plate 13 in the second direction, so that the upper side edge of the light guide plate 13 forms a certain space, the first heat insulation layer 40 includes a first heat insulation part 41 and a second heat insulation part 42, the first heat insulation part 41 is supported on the edge of the light guide plate 13, so as to be located on the side of the optical film 14 facing the light bar 12, and the second heat insulation part 42 is connected to the upper end of the first heat insulation part 41 and is attached to the lower side of the horizontal plate 21. In this way, not only the installation of the first heat insulation layer 40 is realized, but the first heat insulation part 41 can also play a heat insulation effect on the optical film 14, so as to better prevent the optical film 14 from overheating and deforming. Alternatively, the first heat insulation part 41 can be fixedly connected with the light guide plate 13 by bonding, so as to avoid the position of the first heat insulation layer 40 from shifting.

[0059] As Figure 2 shown, the liquid crystal display device further includes a second heat insulation layer 50, which is arranged between the middle frame 20 and the liquid crystal display panel 30. By arranging the second heat insulation layer 50, the heat conduction to the liquid crystal display panel 30 can be further blocked, so as to avoid the liquid crystal display panel 30 from appearing black screen due to high temperature. Alternatively, the second heat insulation layer 50 can be made of glass fiber, asbestos or silicate material, which is not limited here. The second heat insulation layer 50 can be connected with the middle frame 20 and the liquid crystal display panel 30 by bonding.

[0060] In summary, the liquid crystal display device of the embodiment can conduct the heat generated by the lamp beads 122 to the side away from the liquid crystal display panel 30 through the heat dissipation assembly 15, and can block the heat generated by the lamp beads 122 from being conducted to the liquid crystal display panel 30 and the optical film 14 through the first heat insulation layer 40 and the second heat insulation layer 50 arranged between the light bar 12 and the liquid crystal display panel 30, so as to prevent the liquid crystal in the liquid crystal display panel 30 from reaching the liquefaction temperature, and further avoid the problems of black screen of the liquid crystal display panel 30 and overheating damage of the optical film 14 and the light guide plate 13. It can be understood that in some embodiments, the liquid crystal display device can also be provided with only the first heat insulation layer 40 or the second heat insulation layer 50 according to actual needs.

[0061] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For ordinary skilled in the art, according to the idea of the present application, the specific embodiments and application range can be changed, and the content of the specification should not be understood as limiting the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A backlight module, characterized in that, The backboard (11) comprises a bottom plate (111) and a side plate (112) arranged perpendicularly to the bottom plate (111); the light bar (12) comprises a substrate (121) mounted on the inner side of the side plate (112) and a plurality of lamp beads (122) arranged on the substrate (121) at intervals; the heat dissipation assembly (15) comprises a heat dissipation part (151) arranged on the outer side of the bottom plate (111) and a heat absorption part (152) connected with the heat dissipation part (151) and penetrating through the bottom plate (111) and extending into the space between two adjacent lamp beads (122). The heat absorption part (152) comprises a heat-conducting base (1521) penetrating through the bottom plate (111) and connected with the heat dissipation part (151) and a heat absorption coating (1522) covering the heat-conducting base (1521). The heat dissipation assembly (15) comprises a plurality of heat absorption parts (152), and each of the heat absorption parts (152) is arranged between two adjacent lamp beads (122). The heat dissipation part (151) surrounds the outer periphery of one end of the heat absorption part (152) away from the lamp beads (122).

2. The backlight module of claim 1, wherein, In the direction perpendicular to the substrate (121), the thickness of the heat absorption part (152) is greater than the thickness of the lamp bead (122).

3. The backlight module of claim 1, wherein, The heat dissipation assembly (15) is adhesively connected with the bottom plate (111).

4. The backlight module of claim 1, wherein, The liquid crystal display device comprises a liquid crystal display panel (30), a middle frame (20) and the backlight module according to any one of claims 1-6, the middle frame (20) is supported on the side plate (112), and the liquid crystal display panel (30) is supported on the upper side of the middle frame (20).

5. The backlight module of claim 1, wherein, The middle frame (20) comprises a horizontal plate (21) supported on the side plate (112) and a vertical plate (22) located on the outer side of the side plate (112), the backlight module further comprises a first heat insulation layer (40), and the first heat insulation layer (40) is arranged on the lower side of the horizontal plate (21) and located on the upper side of the light bar (12).

6. The backlight module of claim 1, wherein, The backlight module further comprises a light guide plate (13) arranged on the bottom plate (111) and opposite to the lamp beads (122) on one side and an optical film (14) arranged on the light guide plate (13).

7. A liquid crystal display device, characterized by comprising: The first heat insulation layer (40) comprises a first heat insulation part (41) supported on the light guide plate (13) and located on the side of the optical film (14) facing the light bar (12) and a second heat insulation part (42) connected to the upper end of the first heat insulation part (41) and attached to the lower side of the horizontal plate (21).

8. The liquid crystal display device according to claim 7, wherein The liquid crystal display device further comprises a second heat insulation layer (50) arranged between the middle frame (20) and the liquid crystal display panel (30).

9. The liquid crystal display device according to claim 8, wherein ​ ​ 10. The liquid crystal display device according to claim 7, wherein ​

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