Backlight module structure for liquid crystal display

Abstract

The present invention discloses a backlight module structure for a liquid crystal display, which relates to the technical field of liquid crystal displays, including a back mounting plate and a light strip, wherein the light strip is squeezed against the back mounting plate through a pressure strip, and the pressure strip is provided with light-transmitting holes that are sleeved in a one-to-one correspondence with the lamp beads of the light strip, and the plate body of the back mounting plate is provided with a limiting structure that is adapted to the pressure strip. The present invention squeezes the light strip against the back mounting plate through the pressure strip, and the pressure strip is provided with light-transmitting holes that are sleeved in a one-to-one correspondence with the lamp beads of the light strip, and allows the light from the lamp beads on the light strip to pass through the light-transmitting holes and penetrate the pressure strip, so that the light strip and the back mounting plate are fitted together without obstruction, thereby improving the heat conduction efficiency. On the other hand, the light strip and the pressure strip are also fitted together, and a portion of the heat of the light strip can also be conducted and dissipated through the pressure strip, thereby improving the heat dissipation effect of the light strip.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal displays, and in particular to a backlight module structure for liquid crystal displays. Background Art

[0002] Liquid crystal displays are mainly composed of two parts: the liquid crystal panel and the backlight module. The backlight module provides a stable light source for the liquid crystal panel. The backlight module mainly includes a back mounting plate, a light guide component layer, and a light bar. Among them, setting the light bar on the side of the light guide component layer is also a common light source arrangement method of the backlight module, which helps to reduce the overall thickness of the liquid crystal display.

[0003] Existing Chinese patent publication number: CN206039096U, the patent name is "side-entry backlight module", which includes "a PCB board, a plurality of high-brightness LED lamp beads arranged on one side of the PCB board, and a die assembly arranged on one side of the high-brightness LED lamp beads, the outer sides of the plurality of high-brightness LED lamp beads are respectively provided with optical lenses for diverging the light emitted by the high-brightness LED lamp beads, and the optical lenses are fixedly connected to the PCB board";

[0004] Generally speaking, the light bar and the back mounting plate are adhered and connected by a thermally conductive adhesive strip similar to double-sided tape, thereby fixing the light bar on the back mounting plate. The heat generated by the light bar during the lighting process is mainly dissipated by the lamp beads. Excessive heat accumulation may damage the lamp beads and cause the display to not display normally. In order to speed up the heat dissipation of the lamp beads, the back mounting plate material is generally selected as metal to enhance the heat dissipation effect. However, the disadvantage of this solution is that the thermal conductivity of the thermally conductive adhesive strip is limited, and the back mounting plate is located on the back of the lamp beads, thereby limiting the heat dissipation effect of the lamp beads. To solve the above problems, we propose a backlight module structure for liquid crystal displays. Summary of the Invention

[0005] The object of the present invention is to provide a backlight module structure for a liquid crystal display to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A backlight module structure for a liquid crystal display includes a back mounting plate and a light strip. The light strip is squeezed against the back mounting plate via a pressure strip. The pressure strip is provided with light-transmitting holes that are sleeved with the light beads of the light strip in a one-to-one correspondence. The back mounting plate is provided with a limiting structure that is adapted to the pressure strip.

[0008] Preferably, a receiving groove adapted to the line belt of the light bar is provided on the strip body of the strip, and the strip is made of metal.

[0009] Preferably, the back mounting plate comprises a flat plate, and a guide groove structure adapted to fit the light bar is vertically provided on one side edge of the flat plate.

[0010] Preferably, the groove wall of the guide groove structure is provided with through openings corresponding one to one with the light-transmitting holes, and the through openings are connected to elastic strips for applying elastic pushing force to the pressure strips.

[0011] Preferably, a guide channel is opened in the length direction of the strip body of the layering strip, and both ends of the guide channel are located on the corresponding ends of the layering strip.

[0012] Preferably, the back mounting plate is further adapted to be provided with a bottom shell plate, a contour frame is fixed on the edge surface of the bottom shell plate, and openings for the pressure strip and the light strip to pass through are opened on the wall surface of the contour frame.

[0013] Preferably, a connecting port passing through the diversion channel is provided on the side of the pressure strip, and an insertion port that can be aligned with the connecting port is provided on the contour frame, and a filter assembly that can block the diversion channel is adapted to be inserted into the insertion port.

[0014] Preferably, the filter assembly includes a connecting column spirally connected to the plug interface, a filter mesh capable of blocking the diversion channel is provided in the connecting port, the top of the filter mesh is rotatably connected to the connecting column, and a memory metal brush fixed to the end of the pressure strip is provided on the outside of the filter mesh.

[0015] Preferably, a plurality of heat dissipation strip holes are opened at the bottom of the bottom shell plate, and an auxiliary support strip is fixed in each of the heat dissipation strip holes.

[0016] Preferably, the hole wall of the light-transmitting hole is a conical structure, and the wall surface of the light-transmitting hole is coated with a reflective layer.

[0017] In the above technical solution, the present invention provides a backlight module structure for a liquid crystal display, in which the light bar is squeezed against the back mounting plate through a pressure strip, and the pressure strip is provided with light-transmitting holes that correspond one-to-one with the lamp beads of the light bar, and the light from the lamp beads on the light bar passes through the light-transmitting holes and penetrates the pressure strip. This allows the light bar to be fixed to the back mounting plate without the need for a thermally conductive adhesive strip, so that the light bar and the back mounting plate can be fitted together without obstruction, thereby improving the heat conduction efficiency. On the other hand, the light bar and the pressure strip are also fitted together, and part of the heat of the light bar can also be conducted and dissipated through the pressure strip. That is to say, on the whole, the back mounting plate and the pressure strip form a heat dissipation structure, which maintains the stability of the light bar installation, increases the contact area with the light bar, reduces the heat dissipation barrier, and improves the heat dissipation effect of the light bar. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 This is a schematic diagram of a light bar and a holding bar on a back mounting plate of a backlight module for a liquid crystal display according to the present invention;

[0020] Figure 2 A schematic diagram of a back mounting plate of a backlight module for a liquid crystal display according to the present invention;

[0021] Figure 3 This is a schematic diagram of a back mounting plate within an outline frame of a backlight module structure for a liquid crystal display according to the present invention;

[0022] Figure 4 This is a schematic diagram of a filter mesh constructed in a backlight module for a liquid crystal display according to the present invention;

[0023] Figure 5 This is a schematic diagram of the heat dissipation strip holes on the bottom shell plate of a backlight module structure for a liquid crystal display according to the present invention.

[0024] Description of reference numerals:

[0025] 1. Back mounting plate; 1.1. Flat plate; 1.2. Guide groove structure; 1.3. Through-hole; 1.4. Elastic strip; 1.41. First elastic part; 1.42. Second elastic part; 2. Light strip; 3. Pressure strip; 4. Light-transmitting hole; 5. Limiting structure; 6. Accommodating groove; 7. Diversion channel; 8. Bottom shell plate; 9. Contour frame; 10. Opening; 11. Connecting port; 12. Plug interface; 13. Filter assembly; 13.1. Connecting column; 13.2. Filter mesh; 13.3. Memory metal brush; 13.31. Memory metal strip; 13.32. Brush strip; 14. Heat dissipation strip hole; 15. Auxiliary support strip; 16. Light guide plate. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0027] Liquid crystal displays are mainly composed of two parts: the liquid crystal panel and the backlight module. The backlight module provides a stable light source for the liquid crystal panel. The backlight module mainly includes a back mounting plate, a light guide component layer, and a light bar. The light guide component layer includes a light guide plate that is flush with the back mounting plate. Among them, setting the light bar on the side of the light guide component layer is also a common light source setting method for the backlight module. That is, the light guide plate is set parallel to the back mounting plate, and then a light bar is set on the side of the light guide plate to illuminate the edge of the light guide plate, so that the light is diffused through the light guide plate, increasing the bright light area, thereby providing brightness for the liquid crystal panel.

[0028] Generally speaking, the light bar and the back mounting plate are adhered and connected by a thermally conductive adhesive strip similar to double-sided tape, thereby fixing the light bar on the back mounting plate. The heat generated by the light bar during the lighting process is mainly dissipated by the lamp beads. Excessive heat accumulation may damage the lamp beads and cause the display to not display normally. In order to speed up the heat dissipation of the lamp beads, the back mounting plate material is generally selected as metal to enhance the heat dissipation effect. However, the disadvantage of this solution is that the thermal conductivity of the thermally conductive adhesive strip is limited, and the back mounting plate is located on the back of the lamp beads, thereby limiting the heat dissipation effect of the lamp beads. To solve the above problems, we propose a backlight module structure for liquid crystal displays.

[0029] See also Figure 1-Figure 5 The embodiment of the present invention provides a backlight module structure for a liquid crystal display, comprising a back mounting plate 1 and a light bar 2. The light bar 2 is pressed against the back mounting plate 1 by a pressure strip 3. The pressure strip 3 is provided with light-transmitting holes 4 that are correspondingly sleeved with the lamp beads of the light bar 2. The back mounting plate 1 is provided with a limiting structure 5 that is adapted to the pressure strip 3.

[0030] Specifically, the back mounting plate 1 is a flat plate of heat-conducting metal material, the light strip 2 is an LED light strip, the light path of the light strip 2 is parallel to the plate surface of the back mounting plate 1, the pressure strip 3 is the same length as the light strip 2, the pressure strip 3 is made of metal, and the pressure strip 3 and the light strip 2 are fitted together to form a lamp pole structure, the limiting structure 5 is located at the edge of the back mounting plate 1, and the limiting structure 5 is a side wall structure formed by bending the back mounting plate 1. The wall surface of the side wall structure is perpendicular to the plate surface of the back mounting plate 1, and the side wall structure can fit snugly with the lamp pole structure formed by the pressure strip 3 and the light strip 2;

[0031] During actual use, one side of the light strip 2 is squeezed against the side wall of the limiting structure 5, and the limiting structure 5 is formed by bending the back mounting plate 1. Therefore, the back of the light strip 2 is squeezed against the back mounting plate 1, and the heat is conducted by the back mounting plate 1. The front of the light strip 2 is the surface where the lamp beads are located, and the pressure strip 3 is in contact with the front of the light strip 2. When the pressure strip 3 is squeezed toward the limiting structure 5, it limits the light strip 2 on the back mounting plate 1, keeping the light strip 2 in contact with the back mounting plate 1. The other part of the heat of the light strip 2 can also be conducted and dissipated through the pressure strip 3. On the whole, the back mounting plate and the pressure strip form a heat dissipation structure, which maintains the stability of the light strip installation, increases the contact area with the light strip, reduces the heat dissipation barrier, and improves the heat dissipation effect of the light strip.

[0032] In another embodiment provided by the present invention, a receiving groove 6 is formed on the body of the bead 3 and adapted to the line belt of the light bar 2. The bead 3 is made of copper or aluminum. The width of the bead 3 is greater than the width of the light bar 2. The light-transmitting hole 4 is located in the groove body of the receiving groove 6, thereby increasing the contact area between the light bar 2 and the bead 3. The back surface of the light bar 2 is flush with the notch surface of the receiving groove 6.

[0033] During actual use, the lamp beads on the light strip 2 are matched one by one with the light-transmitting holes 4, the light strip of the light strip is adapted to the groove body of the accommodating groove 6, and then the pressure strip 3 presses the light strip 2 toward the limiting structure 5 of the back mounting plate 1, so that the light of the light strip 2 is parallel to the plate surface of the back mounting plate 1, maintaining the installation position of the light strip 2 on the back mounting plate 1.

[0034] In another embodiment provided by the present invention, a back mounting plate 1 includes a flat plate 1.1, and a guide groove structure 1.2 adapted to fit with the light bar 2 is vertically provided on one side edge of the flat plate 1.1. The guide groove structure 1.2 is a tubular structure formed by bending and curling the flat plate 1.1. A light guide plate 16 is arranged parallel to the flat plate 1.1. The tubular channel within the tubular structure formed by the guide groove structure 1.2 can simultaneously accommodate the lamp pole structure formed by the adapting pressure strip 3 and the light bar 2. Preferably, the cross-section of the guide groove structure 1.2 is rectangular, wherein the tubular body of the guide groove structure 1.2 close to the light guide plate 16 is the near-plate position of the guide groove structure 1.2;

[0035] It should be further explained that a through-hole 1.3 corresponding to the light-transmitting hole 4 is formed on the groove wall of the guide groove structure 1.2. The through-hole 1.3 is located near the plate of the guide groove structure 1.2. An elastic strip 1.4 is connected to the through-hole 1.3 to apply an elastic squeezing force to the bead 3. Specifically, the through-hole 1.3 is located on the side where the light of the light bar 2 is irradiated, and the light can be irradiated on the side of the light guide plate 16 arranged on the flat plate 1.1. On the other hand, the elastic strip 1.4 is a strip plate structure formed by stamping the through-hole 1.3. It is integrally connected to the guide groove structure 1.2 and has a certain elasticity. The elastic swing track surface of the elastic strip 1.4 is perpendicular to the longitudinal direction line of the guide groove structure 1.2, thereby exerting an elastic squeezing effect on the bead 3 within the guide groove structure 1.2.

[0036] It should be noted that there are multiple through-holes 1.3, and the multiple through-holes 1.3 are evenly distributed along the length direction line of the guide groove structure 1.2. Each through-hole 1.3 has an elastic strip 1.4, wherein the elastic strip 1.4 is divided into a first elastic portion 1.41 elastically bent toward the inside of the guide groove structure 1.2, and the elastic strip 1.4 also includes a second elastic portion 1.42 elastically bent toward the outside of the guide groove structure 1.2. The first elastic portion 1.41 and the second elastic portion 1.42 are spaced apart from each other, and the first elastic portion 1.41 applies elastic force to the pressure strip 3. The second elastic portion 1.42 can play an elastic supporting role on the side of the light guide plate 16. On the one hand, it can support and buffer the side of the light guide plate 16. On the other hand, it can also control the distance between the light guide plate 16 and the light bar 2, preventing the light guide plate 16 from being too close to the light bar 2 and being damaged and deformed by the high temperature of the lamp beads of the light bar 2, thereby protecting the light baffle 16.

[0037] In another embodiment provided by the present invention, a guide channel 7 is provided along the length of the bead 3, with both ends of the guide channel 7 located at the corresponding ends of the bead 3. On the other hand, the back mounting plate 1 is further adapted to be provided with a bottom shell plate 8, a contour frame 9 is fixed to the edge surface of the bottom shell plate 8, and an opening 10 is provided on the wall surface of the contour frame 9 for the bead 3 and the light bar 2 to pass through;

[0038] The side of the layering strip 3 is provided with a communication port 11 passing through the guide channel 7, and the outline frame 9 is provided with an insertion port 12 that can be aligned with the communication port 11. The insertion port 12 is adapted to be plugged with a filter assembly 13 that can block the guide channel 7.

[0039] Furthermore, the filter assembly 13 includes a connecting post 13.1 spirally connected to the plug port 12, a filter mesh 13.2 capable of blocking the diversion channel 7 is provided in the communication port 11, the top of the filter mesh 13.2 is rotatably connected to the connecting post 13.1, and a memory metal brush 13.3 fixed to the end of the layering strip 3 is provided on the outside of the filter mesh 13.2. The memory metal brush 13.3 includes a memory metal strip 13.31 fixed to the end of the layering strip 3. The length direction line of the memory metal strip 13.31 is parallel to the outside of the filter mesh 13.2. A brush strip 13.32 is fixed to the strip body of the memory metal strip 13.31. The brush strip 13.32 contacts the outer surface of the filter mesh 13.2. The memory metal strip 13.31 has a first state and a second state.

[0040] The guide channel 7 is connected to the outside atmosphere, both ends of the pressure strip 3 extend out of the guide groove structure 1.2, both ends of the pressure strip 3 are located in the corresponding openings 10, and the connecting port 11 is aligned with the plug port 12.

[0041] During the installation process, after the pressure strip 3 and the light bar 2 are adapted to form a lamp pole structure, the lamp pole structure is then inserted into the guide groove structure 1.2 through the opening 10. At this time, the communication port 11 is aligned with the plug interface 12. Since the filter mesh 13.2 is rotatably connected to the connecting post 13.1, the filter mesh 13.2 is inserted into the communication port 11 through the plug interface 12. The connecting post 13.1 is rotated so that the filter mesh 13.2 completely covers the guide channel 7. At this time, a part of the connecting post 13.1 is located in the communication port 11, and the other part is located in the plug interface 12, thereby limiting and locking the pressure strip 3 in the guide groove structure 1.2, and also completing the installation of the filter mesh 13.2 on the guide channel 7. When the light bar 2 fails and needs to be repaired and replaced, the above operation can be reversed to achieve the disassembly and assembly of the light bar 2, which is simple to operate and easy to maintain.

[0042] It should be further explained that the present solution also utilizes the characteristic of the memory metal strip 13.31 to deform at different temperatures to drive the brush strip 13.32 to clean the dust on the filter mesh 13.2. For example, the memory metal strip 13.31 is a nickel-titanium alloy. Under normal conditions, the memory metal strip 13.31 is in a first state.

[0043] In actual use, when the guide channel 7 is in a vertical arrangement state, the air in the guide channel 7 is heated and moves upward and discharged, and the air in the external environment with a lower temperature than the air in the guide channel 7 passes through the opening 10 and through the filter mesh 13.2 to enter the guide channel 7, thereby forming air flow in the guide channel 7, which is beneficial to the heat dissipation effect of the light bar 2. Dust and other floating objects in the air can be blocked by the filter mesh 13.2, thereby maintaining smooth airflow in the guide channel 7. When the filter mesh 13.2 is blocked, the heat dissipation effect of the guide channel 7 is reduced. Lowered, the temperature of the pressure strip 3 on the guide channel 7 increases. When the ambient temperature of the memory metal strip 13.31 reaches a preset temperature, such as 60 degrees Celsius, the memory metal strip 13.31 is deformed. The memory metal strip 13.31 is deformed from the first state to the second state. During the deformation process, the memory metal strip 13.31 drives the brush strip 13.32 to clean the dust and other blockages on the filter mesh 13.2, so that the guide channel 7 is restored to a smooth state, thereby reducing the temperature of the pressure strip 3, which is conducive to the memory metal strip 13.31 returning to the first state.

[0044] In another embodiment provided by the present invention, a plurality of heat dissipation strip holes 14 are provided at the bottom of the bottom shell plate 8, and an auxiliary support strip 15 is fixed in each heat dissipation strip hole 14. The auxiliary support strip 15 is a strip body connected to the bottom shell plate 8 and having a certain elastic deformation. The auxiliary support strip 15 can be elastically hinged to the bottom shell plate 8 through an elastic hinge. Preferably, the auxiliary support strip 15 is a strip body formed by punching the heat dissipation strip holes 14, and a wave groove is provided on the strip body of the auxiliary support strip 15. The auxiliary support strip 15 generates an elastic supporting force perpendicular to the surface of the back mounting plate 1 on the back mounting plate 1, thereby facilitating the formation of a gap space between the back mounting plate 1 and the bottom shell plate 8, which is beneficial for the heat conducted by the back mounting plate 1 to be dissipated from the heat dissipation strip holes 14 of the bottom shell plate 8 in a timely manner.

[0045] In another embodiment provided by the present invention, the hole wall of the light-transmitting hole 4 is of a conical structure, and the wall surface of the light-transmitting hole 4 is coated with a reflective layer, which further aggregates the light from the light-transmitting hole 4 and improves the illumination brightness, thereby reducing the power usage of the light strip 2 and indirectly reducing the heat generated by the light strip 2.

[0046] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A backlight module structure for a liquid crystal display, comprising a back mounting plate (1) and a light bar (2), characterized in that: The light strip (2) is squeezed against the back mounting plate (1) via a pressure strip (3); the pressure strip (3) is provided with light-transmitting holes (4) that are sleeved one-to-one with the lamp beads of the light strip (2); and the back mounting plate (1) is provided with a limiting structure (5) that is adapted to the pressure strip (3); The strip body of the pressure strip (3) is provided with a receiving groove (6) adapted to the line band of the light strip (2); the pressure strip (3) is made of metal; the back mounting plate (1) comprises a flat plate (1.1); a guide groove structure (1.2) adapted to fit the light strip (2) is vertically provided on one side edge of the flat plate (1.1); a through hole (1.3) corresponding to the light-transmitting hole (4) is provided on the groove wall of the guide groove structure (1.2); and an elastic strip (1.4) for applying an elastic pushing force to the pressure strip (3) is connected to the through hole (1.3); The elastic strip (1.4) is divided into a first elastic portion (1.41) elastically bent toward the inside of the guide groove structure (1.2), and the elastic strip (1.4) also includes a second elastic portion (1.42) elastically bent toward the outside of the guide groove structure (1.2). The first elastic portion (1.41) applies an elastic pushing force to the pressure strip (3), so that the pressure strip (3) tightly squeezes the light strip (2) onto the side wall of the guide groove structure (1.2). The second elastic portion (1.42) can play an elastic supporting role on the side of the light guide plate (16). On the other hand, it can also control the distance between the light guide plate (16) and the light strip (2), so as to prevent the light guide plate (16) from being too close to the light strip (2) and being damaged and deformed by the high temperature of the lamp beads.

2. The backlight module structure for a liquid crystal display according to claim 1, characterized in that: A guide channel (7) is provided in the length direction of the strip body of the layering strip (3), and both ends of the guide channel (7) are located on the corresponding ends of the layering strip (3).

3. The backlight module structure for a liquid crystal display according to claim 2, characterized in that: The back mounting plate (1) is also adapted to be provided with a bottom shell plate (8), a contour frame (9) is fixed on the edge surface of the bottom shell plate (8), and an opening (10) for the pressure strip (3) and the light strip (2) to pass through is provided on the wall surface of the contour frame (9).

4. The backlight module structure for a liquid crystal display according to claim 3, characterized in that: A connecting port (11) passing through the guide channel (7) is provided on the side of the pressure strip (3), and an insertion port (12) capable of being aligned with the connecting port (11) is provided on the contour frame (9), and a filter assembly (13) capable of blocking the guide channel (7) is adapted to be inserted into the insertion port (12).

5. The backlight module structure for a liquid crystal display according to claim 4, characterized in that: The filter assembly (13) comprises a connecting column (13.1) spirally connected to the plug interface (12); a filter mesh (13.2) capable of blocking the diversion channel (7) is provided in the communication port (11); the top of the filter mesh (13.2) is rotatably connected to the connecting column (13.1); and a memory metal brush (13.3) fixed to the end of the pressure strip (3) is provided on the outside of the filter mesh (13.2).

6. The backlight module structure for a liquid crystal display according to claim 5, characterized in that: A plurality of heat dissipation strip holes (14) are provided at the bottom of the bottom shell plate (8), and an auxiliary support strip (15) is fixed in each of the heat dissipation strip holes (14).

7. The backlight module structure for a liquid crystal display according to claim 6, characterized in that: The hole wall of the light-transmitting hole (4) is of a conical structure, and the wall surface of the light-transmitting hole (4) is coated with a reflective layer.

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