Backlight module structure for liquid crystal display

Abstract

The invention discloses a backlight module structure for a liquid crystal display, and relates to the technical field of liquid crystal displays, the backlight module structure comprises a back mounting plate and a light bar, the light bar is extruded with the back mounting plate through a pressing strip, and the pressing strip is provided with light holes correspondingly sleeved with lamp beads of the light bar one by one. The light bars are extruded with the back mounting plate where the light bars are located through the pressing strips, the pressing strips are provided with the light holes correspondingly connected with the light beads of the light bars in a sleeving mode in a one-to-one mode, and the light beads on the light bars penetrate through the pressing strips through the light holes, so that the light beads on the light bars can be fixed to the back mounting plate through the pressing strips. The light bar and the back mounting plate are attached without obstruction, heat conduction efficiency is improved, on the other hand, the light bar and the pressing bar are attached in a matched mode, part of heat of the light bar can be conducted and dissipated through the pressing bar, and the heat dissipation effect of the light bar is improved.

Description

Technical Field

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

[0002] Liquid crystal displays mainly consist of two major parts: a liquid crystal panel and a 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 one of the common light source setting methods for backlight modules, which is beneficial to reducing the overall thickness of the liquid crystal display;

[0003] Existing ones, such as the Chinese patent publication number: CN206039096U, with the patent name "Side - entry backlight module", this patent includes "a PCB board, a number of high - brightness LED lamp beads arranged on one side of the PCB board, and a film component arranged on one side of the high - brightness LED lamp beads. Optical lenses for diverging the light emitted by the high - brightness LED lamp beads are respectively sleeved outside the number of high - brightness LED lamp beads, and the optical lenses are fixedly connected to the PCB board";

[0004] Generally, the light bar and the back mounting plate are adhesively connected through a heat - conductive adhesive strip similar to double - sided tape, so as to fix the light bar on the back mounting plate. The heat generated during the light - emitting process of the light bar is mainly dissipated by the lamp beads. If the heat accumulates too high, it may damage the lamp beads and cause the display to malfunction. To accelerate the heat dissipation of the lamp beads, the material of the back mounting plate is generally selected as a metal material to enhance the heat dissipation effect. However, the disadvantage of this solution is that the heat - conductive ability of the heat - conductive adhesive strip is limited, and the back mounting plate is located behind the lamp beads, thus restricting the heat dissipation effect of the lamp beads. To solve the above problems, we propose a backlight module structure for a liquid crystal display. Summary of the Invention

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

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A backlight module structure for a liquid crystal display, including a back mounting plate and a light bar. The light bar is squeezed by a pressure bar against the back mounting plate where it is located. The pressure bar is provided with light - passing holes corresponding to and sleeved on the lamp beads of the light bar one by one. A limiting structure adapted to the pressure bar is provided on the plate body of the back mounting plate.

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

[0009] Preferably, the back mounting plate includes 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, through holes corresponding to the light-transmitting holes one by one are formed on the groove wall of the guide groove structure, and elastic strips for applying elastic extrusion force to the pressure strip are connected to the through holes.

[0011] Preferably, a diversion channel is formed in the length direction of the strip body of the pressure strip, and both ends of the diversion channel are located on the corresponding ends of the pressure strip.

[0012] Preferably, a bottom case plate is also adaptively provided on the back mounting plate, a contour frame is fixed on the edge surface of the bottom case plate, and openings for the pressure strip and the light bar to pass through are formed on the wall surface of the contour frame.

[0013] Preferably, a communication port passing through the diversion channel is formed on the side surface of the strip body of the pressure strip, an insertion port capable of being aligned with the communication port is formed on the contour frame, and a filter screen assembly capable of blocking the diversion channel is adaptively inserted into the insertion port.

[0014] Preferably, the filter screen assembly includes a connecting column screwed to the insertion port, a filter screen for blocking the diversion channel is arranged in the communication port, the top of the filter screen is rotatably connected to the connecting column, and a memory metal brush fixed to the end of the pressure strip is arranged outside the filter screen.

[0015] Preferably, a plurality of heat dissipation strip holes are formed at the bottom of the bottom case plate, and auxiliary support strips are fixed in each of the heat dissipation strip holes.

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

[0017] In the above technical solution, for a backlight module structure for a liquid crystal display provided by the present invention, the light bar is pressed against the back mounting plate through the pressure strip. The pressure strip is provided with light-transmitting holes sleeved corresponding to the lamp beads of the light bar one by one, and the light of the lamp beads on the light bar passes through the light-transmitting holes and penetrates the pressure strip, so that the light bar does not need to be fixed on the back mounting plate through a heat-conducting rubber strip, and a barrier-free fit between the light bar and the back mounting plate is realized, improving the heat conduction efficiency. On the other hand, the light bar and the pressure strip are also adapted to fit, and part of the heat of the light bar can also be conducted and dissipated through the pressure strip. That is to say, as a whole, the back mounting plate and the pressure strip form a heat dissipation structure, which not only maintains the stability of the installation of the light bar, increases the contact area with the light bar, reduces the heat dissipation barrier, but also improves the heat dissipation effect of the light bar. Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of the lamp strip and the pressure strip of the backlight module structure for a liquid crystal display of the present invention mounted on the back mounting plate.

[0020] Figure 2 It is a schematic diagram of the back mounting plate of the backlight module structure for a liquid crystal display of the present invention.

[0021] Figure 3 It is a schematic diagram of the back mounting plate of the backlight module structure for a liquid crystal display of the present invention within the contour frame.

[0022] Figure 4 It is a schematic diagram of the filter mesh of the backlight module structure for a liquid crystal display of the present invention.

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

[0024] Explanation of reference numerals:

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

[0026] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will further introduce the present invention in detail with reference to the drawings.

[0027] The liquid crystal display mainly consists of two major 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 and attached to the back mounting plate. Among them, setting the light bar on the side of the light guide component layer is also one of the common light source setting methods for the backlight module. That is to say, the light guide plate is arranged parallel to the back mounting plate, and then the light bar is set on the side of the light guide plate to irradiate towards the edge of the light guide plate, so that the light diffuses through the light guide plate, increasing the bright area, thereby providing brightness for the liquid crystal panel;

[0028] Generally speaking, the light bar is adhesively connected to the back mounting plate through a heat-conducting adhesive strip similar to double-sided tape, so as to fix the light bar on the back mounting plate. The heat generated by the light bar during the light-emitting process is mainly dissipated by the lamp beads. If the heat accumulates too high, it may damage the lamp beads and cause the display to malfunction. To accelerate the heat dissipation of the lamp beads, the material of the back mounting plate is generally selected as a metal material to enhance the heat dissipation effect. However, the disadvantage of this solution is that the heat-conducting ability of the heat-conducting adhesive strip is limited, and the back mounting plate is located behind the lamp beads, thus restricting the heat dissipation effect of the lamp beads. To solve the above problems, we propose a backlight module structure for a liquid crystal display.

[0029] Please refer to Figures 1 - 5 , a backlight module structure for a liquid crystal display provided by an embodiment of the present invention includes a back mounting plate 1 and a light bar 2. The light bar 2 is pressed against the back mounting plate 1 where it is located through a pressure strip 3. The pressure strip 3 is provided with light-transmitting holes 4 that are sleeved corresponding to the lamp beads of the light bar 2 one by one. A limiting structure 5 adapted to the pressure strip 3 is provided on the plate body of the back mounting plate 1;

[0030] Specifically, the back mounting plate 1 is a flat plate made of heat-conducting metal material. The light bar 2 is an LED light bar. The light path of the light bar 2 is parallel to the plate surface of the back mounting plate 1. The pressure strip 3 has the same length as the light bar 2. The pressure strip 3 is made of metal material. The pressure strip 3 and the light bar 2 are attached to each other to form a lamp rod structure. The limiting structure 5 is located at the edge position of the back mounting plate 1. 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. The side wall structure can be fitted with the lamp rod structure formed by the pressure strip 3 and the light bar 2;

[0031] During actual use, one side of the light bar 2 is pressed 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 bar 2 is pressed against the back mounting plate 1 to receive heat dissipation conducted by the back mounting plate 1. The front of the light bar 2 is the surface where the lamp beads are located. When the pressing strip 3 is pressed against the front of the light bar 2, it has a limiting effect on the light bar 2 on the back mounting plate 1, keeping the light bar 2 in contact with the back mounting plate 1. The heat of the other part of the light bar 2 can also be dissipated through the pressing strip 3. Overall, the back mounting plate and the pressing strip form a heat dissipation structure, which not only maintains the stability of the light bar installation, increases the contact area with the light bar, reduces the heat dissipation barrier, but also improves the heat dissipation effect of the light bar.

[0032] In another embodiment provided by the present invention, a receiving groove 6 adapted to the circuit strip of the light bar 2 is provided on the strip body of the pressing strip 3. The pressing strip 3 is made of copper or aluminum. The width of the pressing strip 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 pressing strip 3. The back 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 bar 2 are aligned with the light-transmitting holes 4 one by one. The light strip of the light bar is adapted to the groove body of the receiving groove 6. Then, the pressing strip 3 presses the light bar 2 against the limiting structure 5 of the back mounting plate 1, so that the light of the light bar 2 is parallel to the plate surface of the back mounting plate 1, maintaining the installation and positioning of the light bar 2 on the back mounting plate 1.

[0034] In still another embodiment provided by the present invention, the back mounting plate 1 includes a flat plate 1.1. A guide groove structure 1.2 adapted to and in contact with the light bar 2 is vertically provided at 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 in parallel on the flat plate 1.1. The tubular channel in the tubular structure formed by the guide groove structure 1.2 can simultaneously accommodate the lamp pole structure formed by the pressing strip 3 and the light bar 2. Preferably, the cross-section of the guide groove structure 1.2 is rectangular. Among them, the tube body of the guide groove structure 1.2 close to the light guide plate 16 is the position of the guide groove structure 1.2 near the plate.

[0035] It should be further noted that through openings 1.3 corresponding to the light-transmitting holes 4 one by one are formed in the groove walls of the guide groove structure 1.2. The through openings 1.3 are located at the position of the guide groove structure 1.2 close to the plate. An elastic strip 1.4 for applying an elastic extrusion force to the pressure strip 3 is connected to the through openings 1.3. Specifically, the through openings 1.3 are located on the side irradiated by the light of the light bar 2, and the light can irradiate on the side surface 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 structure formed by stamping the through openings 1.3. It is integrally connected with the guide groove structure 1.2 itself and has a certain elasticity. The elastic swing track surface of the elastic strip 1.4 is perpendicular to the length direction line of the guide groove structure 1.2, so as to elastically extrude the pressure strip 3 in the guide groove structure 1.2;

[0036] It should be particularly noted that the number of the through openings 1.3 is multiple, and the multiple through openings 1.3 are evenly distributed along the length direction line of the guide groove structure 1.2. Elastic strips 1.4 are arranged on each of the through openings 1.3. The elastic strip 1.4 is divided into a first elastic force part 1.41 that elastically bends towards the inside of the guide groove structure 1.2, and the elastic strip 1.4 also includes a second elastic force part 1.42 that elastically bends towards the outside of the guide groove structure 1.2. The first elastic force part 1.41 and the second elastic force part 1.42 are spaced apart from each other. The first elastic force part 1.41 applies an elastic extrusion force to the pressure strip 3, so that the pressure strip 3 tightly presses the light bar 2 against the side wall of the guide groove structure 1.2, so as to keep the light of the light bar 2 passing through the through openings 1.3 and irradiating on the side surface of the light guide plate 16. In addition, the second elastic force part 1.42 can elastically support the side surface of the light guide plate 16. On the one hand, it plays a role of supporting and buffering the side surface of the light guide plate 16, and on the other hand, it can also control the distance between the light guide plate 16 and the light bar 2, avoiding the light guide plate 16 being damaged and deformed by the high temperature of the lamp beads of the light bar 2 too close, and playing a protective role for the light blocking plate 16.

[0037] In another embodiment provided by the present invention, a diversion channel 7 is formed in the length direction of the strip body of the pressure strip 3, and both ends of the diversion channel 7 are located at the corresponding ends of the pressure strip 3. On the other hand, the back mounting plate 1 is also adaptively provided with a bottom shell plate 8, and a contour frame 9 is fixed on the edge surface of the bottom shell plate 8. An opening 10 for the pressure strip 3 and the light bar 2 to pass through is formed on the wall surface of the contour frame 9;

[0038] Wherein, a communication port 11 passing through the diversion channel 7 is formed on the side surface of the strip body of the pressure strip 3, an insertion port 12 capable of being aligned with the communication port 11 is formed on the contour frame 9, and a filter screen assembly 13 capable of blocking the diversion channel 7 is adaptively inserted into the insertion port 12;

[0039] Further, the filter screen assembly 13 includes a connecting column 13.1 that is screwed to the insertion interface 12. A filter screen 13.2 capable of blocking the diversion channel 7 is provided in the communication port 11. The top of the filter screen 13.2 is rotatably connected to the connecting column 13.1. A shape memory metal brush 13.3 fixed to the end of the pressure strip 3 is provided outside the filter screen 13.2. The shape memory metal brush 13.3 includes a shape memory metal strip 13.31 fixed to the end of the pressure strip 3. The length direction line of the shape memory metal strip 13.31 is parallel to the outside of the filter screen 13.2. Brush strips 13.32 are fixed on the strip body of the shape memory metal strip 13.31. The brush strips 13.32 are in contact with the outer surface of the filter screen 13.2. The shape memory metal strip 13.31 has a first state and a second state;

[0040] Among them, the diversion channel 7 is communicated with 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. The communication port 11 is aligned with the insertion interface 12.

[0041] During the installation process, after the pressure strip 3 and the lamp strip 2 are adapted to form a lamp post structure, the lamp post structure is inserted into the guide groove structure 1.2 through the opening 10. At this time, the communication port 11 is aligned with the insertion interface 12. Since the filter screen 13.2 is rotatably connected to the connecting column 13.1, the filter screen 13.2 enters the communication port 11 through the insertion interface 12. Rotate the connecting column 13.1 so that the filter screen 13.2 completely covers the diversion channel 7. At this time, a part of the connecting column 13.1 is located in the communication port 11, and the other part is located in the insertion interface 12, thereby playing a role in limiting and locking the pressure strip 3 in the guide groove structure 1.2, and at the same time completing the installation of the filter screen 13.2 on the diversion channel 7. When the lamp strip 2 needs to be repaired and replaced due to a fault, reversing the above operations can achieve the disassembly and assembly of the lamp strip 2, and the operation is simple and convenient for maintenance;

[0042] It should be further noted that this solution also utilizes the characteristic that the shape memory metal strip 13.31 deforms at different temperatures to drive the brush strips 13.32 to clean the dust on the filter screen 13.2. For example, the shape memory metal strip 13.31 is a nickel-titanium alloy. In the normal state, the shape memory metal strip 13.31 is in the first state;

[0043] In actual use, when the diversion channel 7 is in a vertical arrangement state, the air in the diversion channel 7 is heated and moves upward to be discharged, while the air in the external environment with a relatively lower temperature than the air in the diversion channel 7 passes through the opening 10 and the filter mesh 13.2 to supplement into the diversion channel 7, thus forming an air flow in the diversion channel 7, which is beneficial to improving the heat dissipation effect of the lamp strip 2. Floating substances such as dust in the air can be blocked by the filter mesh 13.2, thereby keeping the air flow in the diversion channel 7 unobstructed. When the filter mesh 13.2 is blocked, the heat dissipation effect of the diversion channel 7 decreases, and the temperature of the pressure strip 3 on the diversion channel 7 rises. When the environmental temperature where the shape memory metal strip 13.31 is located reaches the preset temperature, such as 60 degrees Celsius, at this time, the shape memory metal strip 13.31 deforms, and the shape memory metal strip 13.31 deforms from the first state to the second state. During the deformation process, the shape 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 diversion channel 7 returns to an unobstructed state again, thereby reducing the temperature of the pressure strip 3, and further facilitating the shape memory metal strip 13.31 to return to the first state.

[0044] Another embodiment provided by the present invention is that a plurality of heat dissipation strip holes 14 are opened at the bottom of the bottom shell plate 8, and auxiliary support strips 15 are fixed in each heat dissipation strip hole 14. The auxiliary support strips 15 are strip bodies connected to the bottom shell plate 8 and having a certain elastic deformation. The auxiliary support strips 15 can be elastically hinged to the bottom shell plate 8 through elastic hinge members. Preferably, the auxiliary support strips 15 are strip bodies formed by punching the heat dissipation strip holes 14, and wave grooves are opened on the strip bodies of the auxiliary support strips 15. The auxiliary support strips 15 generate an elastic supporting force perpendicular to the plate surface of the back mounting plate 1, which is beneficial to forming a gap space between the back mounting plate 1 and the bottom shell plate 8, and is beneficial to 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 time.

[0045] Another embodiment provided by the present invention is that the pore wall of the light-transmitting hole 4 is of a conical structure, and a reflective layer is coated on the wall surface of the light-transmitting hole 4 to further converge the light of the light-transmitting hole 4, improve the irradiation brightness, thereby reducing the power consumption of the lamp strip 2 and indirectly reducing the heat generation of the lamp strip 2.

[0046] Only some exemplary embodiments of the present invention have been described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present invention, the described embodiments can be modified in various different ways. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present invention.

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 bar (2) is pressed against the back mounting plate (1) via a pressure strip (3); the pressure strip (3) is provided with light-transmitting holes (4) which are sleeved one-to-one with the lamp beads of the light bar (2); and the plate body of the back mounting plate (1) is provided with a limiting structure (5) which is adapted to the pressure strip (3).

2. A backlight module structure for a liquid crystal display according to claim 1, characterized in that: The strip body of the pressure strip (3) is provided with a receiving groove (6) adapted to the line belt of the light strip (2), and the pressure strip (3) is made of metal.

3. A backlight module structure for a liquid crystal display according to claim 2, characterized in that: The back mounting plate (1) comprises a flat plate (1.1), and a guide groove structure (1.2) adapted to fit the light bar (2) is vertically provided on one side edge of the flat plate (1.1).

4. The backlight module structure for a liquid crystal display according to claim 3, characterized in that: The groove wall of the guide groove structure (1.2) is provided with through openings (1.3) corresponding one to one with the light-transmitting holes (4), and the through openings (1.3) are connected to elastic strips (1.4) for applying elastic pushing force to the pressure strip (3).

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

6. The backlight module structure for a liquid crystal display according to claim 5, 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) is provided on the wall surface of the contour frame (9) for the pressure strip (3) and the light strip (2) to pass through.

7. The backlight module structure for a liquid crystal display according to claim 6, characterized in that: A connecting opening (11) passing through the guide channel (7) is provided on the side of the strip body of the pressure strip (3); an inserting port (12) capable of being aligned with the connecting opening (11) is provided on the contour frame (9); a filter assembly (13) capable of blocking the guide channel (7) is adapted to be inserted into the inserting port (12).

8. The backlight module structure for a liquid crystal display according to claim 7, 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 guide 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).

9. The backlight module structure for a liquid crystal display according to claim 8, 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).

10. The backlight module structure for a liquid crystal display according to claim 9, characterized in that: The hole wall of the light-transmitting hole (4) is of a conical structure, and a reflective layer is coated on the wall surface of the light-transmitting hole (4).

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