Heat dissipation plate and side-in type backlight module using heat dissipation plate

Abstract

The utility model discloses a heat dissipation panel and a side entry type backlight module using the heat dissipation panel, the heat dissipation panel comprises an L-shaped heat dissipation aluminum plate, the heat dissipation aluminum plate is provided with a long side plate and a short side plate, the inner side of the short side plate is vertically provided with a light bar clamping groove, one side, facing the long side plate, of the light bar clamping groove is provided with a light-transmitting groove, and the light-transmitting groove is provided with a light-emitting diode (LED) light source. A light bar can be inserted into the light bar clamping groove from an opening in one side of the light bar clamping groove, reflecting faces are arranged on the two sides of a light-transmitting groove in the light bar clamping groove respectively, the two reflecting faces are arranged in an opposite inclined mode, drawer type light bar assembly can be achieved through a side-in type backlight module manufactured through the heat dissipation plate, and the light bar and an aluminum plate are fixed in an interference fit mode. The assembling operation efficiency can be effectively improved, meanwhile, fixing and heat dissipation of the light bar are achieved, heat-conducting glue is not needed, the technology is simplified, and cost is reduced; and scattered light is effectively reflected through the arranged reflecting surfaces, the light utilization rate is increased, and lamp shadows are effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of liquid crystal display technology, and more specifically, to a heat sink and a side-lit backlight module using the heat sink. Background Technology

[0002] LCD monitors mainly consist of an LCD panel and a backlight module. Since the LCD panel itself cannot emit light, it needs a backlight module to provide a uniformly distributed surface light source to display images properly. Good backlight performance is a key factor in the display effect of an LCD monitor. Backlight modules are mainly divided into edge-lit backlight, direct-lit backlight, and edge-lit backlight. Among them, the edge-lit backlight module converts the light source into a surface light source through a light guide plate and optical film, thereby illuminating the LCD panel to display images. Because its light source (such as a light bar) is located on the side of the LCD panel, the overall thickness of the monitor can be reduced, and it is widely used in the monitor industry.

[0003] Traditional side-lit LED strips require thermally conductive adhesive. This adhesive secures the strip and improves heat dissipation. Its core function is to quickly transfer the heat generated by the LED strip to the heat dissipation structure through both bonding and thermal conductivity, thus preventing optical component deformation or performance degradation caused by localized high temperatures. Top blocks are used to precisely position the LED strip during module assembly, ensuring a tight fit with the incident surface of the light guide plate and preventing light leakage due to displacement. Top blocks are typically located at both ends or in the middle of the strip, working in conjunction with the slots or support structures on the edge of the light guide plate to form stable fixing points. Both the thermally conductive adhesive and the top blocks serve to secure other components, making them an indispensable part of traditional side-lit LED strips and contributing to their cost.

[0004] The stopper in a backlight module is a mechanical component used to fix or restrict the position of components. Its main function is to ensure that core components such as light guide plates and optical films maintain precise alignment during assembly or use, thereby avoiding optical non-uniformity caused by displacement. The complex stopper structure not only leads to high production costs and low efficiency, but also to low assembly efficiency and low yield.

[0005] Backlight shadows are localized bright and dark stripes in backlight modules caused by uneven light source distribution or structural defects. They mainly manifest as bright spots projected by LED beads on the backlight strips or dark areas formed by obstructions from supporting components, directly affecting display uniformity. Much effort has been made in this field to solve the backlight shadow problem in backlight modules:

[0006] Chinese utility model patent CN 205592723U discloses a side-lit light strip and a backlight module containing it to reduce hot spots. This patent adds a reinforcing light source between two adjacent main light sources on the light strip. Although this method can improve the overall brightness uniformity of the light guide plate, adding light sources will cause the display to generate more heat during use, resulting in a significant reduction in the lifespan of the light source. To solve this problem, better heat conduction and heat dissipation methods are needed.

[0007] Chinese utility model patent CN 217333071 U discloses a backlight module and display device, which has a groove in the mounting part, a light strip is placed in the groove, a reflective layer is coated in the groove, and a lens is added to the LED beads. Although this patent can improve the problems of light shadow and uneven brightness, since the light source is one of the key factors of the display effect, the positional correspondence between the light source and the light guide plate is particularly important. The traditional side-lit light strip assembly method is relatively complicated. Due to the alignment tolerance of the light strip PCB and the thermal conductive adhesive, the light strip is easy to be misaligned, which affects the subjective quality and the reliability of the surface light source. Therefore, it requires more skilled workers with more experience in light strip assembly and subsequent testing is more rigorous. Utility Model Content

[0008] This invention overcomes the shortcomings of the prior art by providing a heat sink and a side-lit backlight module using the heat sink, in order to solve the problems of poor heat dissipation and difficult assembly of existing side-lit backlight modules, and at the same time, to reduce costs.

[0009] To solve the above-mentioned technical problems, one embodiment of this utility model adopts the following technical solution:

[0010] A heat sink includes an L-shaped heat sink aluminum plate with a long side plate and a short side plate. The inner side of the short side plate is provided with a light strip slot. A light-transmitting groove is opened on the side of the light strip slot facing the long side plate. The light strip can be inserted into the light strip slot from one side opening. Reflective surfaces are provided on both sides of the light-transmitting groove on the light strip slot, and the two reflective surfaces are inclined in opposite directions.

[0011] Furthermore, the reflective surface is a silver reflective layer.

[0012] Furthermore, multiple screw holes are also provided on the long side plate of the heat dissipation aluminum plate.

[0013] Furthermore: the screw hole is a countersunk hole.

[0014] Furthermore, four screw holes are provided on the long side of the heat dissipation aluminum plate.

[0015] Furthermore: when the display size is greater than 32 inches, the number of screw holes is greater than or equal to five.

[0016] A side-lit backlight module using a heat sink, in addition to the heat sink, includes a light strip, a light guide plate, a diaphragm, and a reflective paper. The light strip is assembled in a drawer-like manner in the light strip slot of the heat sink aluminum plate. The reflective paper is attached to the long side plate of the heat sink aluminum plate. The diaphragm is disposed on the opposite side of the reflective paper. The light guide plate is disposed between the diaphragm and the reflective paper and is located on the opposite side of the light strip slot.

[0017] Furthermore: the light strip and the light strip slot are interference-fitted.

[0018] Furthermore, the reflected light from the two reflective surfaces is aligned with the light guide plate.

[0019] Furthermore, the LED beads of the light strip are located within the light-transmitting groove.

[0020] Compared with the prior art, this utility model has at least the following beneficial effects: This utility model designs a heat dissipation aluminum plate structure, which realizes drawer-type light strip assembly through the heat dissipation aluminum plate. The light strip and aluminum plate are fixed by interference fit, which can effectively improve the assembly efficiency, and at the same time realize the fixing and heat dissipation of the light strip. There is no need to use thermal conductive adhesive, simplifying the process and reducing costs; the reflective surface effectively reflects scattered light, improves light utilization, and effectively improves light shadow; compared with the traditional backlight module assembly method, this utility model has the characteristics of simple operation and high process efficiency. The drawer-type assembly method does not require precise positioning. The special structural design can improve the module brightness while reducing the cost of diaphragms, LEDs, top blocks, etc.

[0021] Due to the novel structural design of the heat dissipation aluminum plate, the backlight module relies on the heat dissipation aluminum plate next to the LED beads to support the light guide plate. There is no need to add a top block on the LED strip PCB board, which can optimize the LED bead arrangement design and LED strip layout routing. Attached Figure Description

[0022] Figure 1 This is a top view of a heat sink according to the present invention;

[0023] Figure 2 This is a left view of a heat sink according to the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of a side-lit backlight module according to the present invention;

[0025] The numbers in the diagram are as follows: 1. Heat dissipation aluminum plate; 2. LED strip slot; 3. Long side plate; 4. LED strip; 5. LED beads; 6. Reflective surface; 7. Screw hole; 8. Light guide plate; 9. Reflective paper; 10. Diaphragm. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0027] like Figure 1-3 As shown: A heat sink includes an L-shaped aluminum heat sink 1. Figure 1 The heat dissipation aluminum plate 1 has a profile cross-sectional structure and serves as the fixing base for the light strip 4. It has a long side plate 3 and a short side plate. The inner side of the short side plate of the heat dissipation aluminum plate 1 is provided with a light strip slot 2. A light-transmitting groove is opened on the side of the light strip slot 2 facing the long side plate 3. The light strip 4 is inserted into the light strip slot 2 through one opening on one side. The drawer-type light strip assembly is achieved through the heat dissipation aluminum plate 1. The LED beads 5 face the light-transmitting groove and are located in the light-transmitting groove. The light strip 4 and the light strip slot 2 are interference-fitted, thereby ensuring that the LED beads 5 are fixed in position in the light-transmitting groove without the need for a top block to fix the light strip. Due to the interference fit between the light strip 4 and the light strip slot 2, the gap between them is reduced, and the heat dissipation aluminum plate 1 can dissipate heat from the light strip 4 without the need to apply thermal conductive adhesive.

[0028] The light strip slot 2 has reflective surfaces 6 on both sides of the light-transmitting groove. The two reflective surfaces 6 are inclined towards each other. The thickness of the reflective surface 6 is less than 0.2mm, the width is less than 8mm, the dimensional tolerance is ±0.1mm, and the color is silver or white. The reflective surfaces 6 effectively improve the light shadow, and improve the brightness of the module while reducing the cost of thermal conductive adhesive, LED beads, stopper, etc. In actual use, part of the light source emitted by the LED beads 5 directly enters the light guide plate 8, while part of the light source is scattered and cannot directly enter the light guide plate 8. Existing technology often supplements the light source by adding multiple LED beads due to light scattering. This utility model, by adding reflective surfaces 6 on both sides of the light-transmitting groove, can effectively reflect the scattered light source, so that the scattered light source is reflected to the light guide plate 8 and reflective paper 9, which can effectively increase the light utilization rate, reduce the number of LED beads 5, and reduce the heat source problem, thus effectively extending the service life of the light strip 4. Optionally, the reflective surface 6 is made of silver reflective layer. This invention uses the structure of a heat-dissipating aluminum plate to unify the gap between the light guide plate and the LED beads (the physical distance between LED beads), while the cavity wall is coated with a silver reflective layer to improve the conversion efficiency of line to surface light source, increase module brightness, and reduce lamp shadow and top block shadow.

[0029] Multiple screw holes 7 are also provided on the long side plate 3 of the heat dissipation aluminum plate 1. During installation, it is fixedly connected to the back plate through the screw holes 7. The back plate is usually located at the bottom of the backlight module, wrapping or supporting other optical components. The screw holes 7 are countersunk holes, so that the reflective paper 9 fits more stably with the heat dissipation aluminum plate 1. Preferably, four screw holes 7 are provided on the long side plate 3 of the heat dissipation aluminum plate 1. When the display size is larger than 32 inches, the number of screw holes 7 is greater than or equal to five, so as to ensure a more stable connection between the heat dissipation aluminum plate and the back plate.

[0030] The side-lit backlight module uses the aforementioned heat sink. In addition, the side-lit backlight module also includes a light guide plate 8, a diaphragm 10, and a reflective paper 9. The reflective paper 9 is attached to the long side plate 3 of the heat sink aluminum plate 1. The diaphragm 10 is located on the opposite side of the reflective paper 9. The light guide plate 8 is located between the diaphragm 10 and the reflective paper 9 and on the opposite side of the LED strip slot 2. When using the side-lit backlight module, the LED beads 5 emit light, the light guide plate 8 refracts and evenly distributes the light on the LCD panel, the reflective surface 6 reflects the scattered light source to the light guide plate 8, and the reflective paper 9 reflects the light leaking out of the light guide plate 8 back to the light guide plate 8, improving the light utilization efficiency. The diaphragm 10 makes the light more uniform and increases the brightness.

[0031] Although the present invention has been described herein with reference to illustrative embodiments, it should be understood that many other modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and improvements can be made to the components and / or layout of the subject matter combination within the scope of the present application. Besides variations and improvements to the components and / or layout, other uses will be apparent to those skilled in the art.

Claims

1. A heat spreader, characterized by: The application relates to a heat-dissipating aluminum plate (1) comprising an L-shaped heat-dissipating aluminum plate (1) having a long-side plate (3) and a short-side plate, the inner side of the short-side plate being provided with a lamp strip clamping groove (2), the lamp strip clamping groove (2) being provided with a light-transmitting groove on the side facing the long-side plate (3), a lamp strip (4) being capable of being inserted into the lamp strip clamping groove (2) from the side opening of the lamp strip clamping groove (2), the two sides of the light-transmitting groove on the lamp strip clamping groove (2) being respectively provided with a reflecting surface (6), and the two reflecting surfaces (6) being oppositely and obliquely arranged.

2. The heat spreader of claim 1, wherein: The reflecting surface (6) is a silver reflecting layer.

3. The heat spreader of claim 2, wherein: The reflected light of the two reflecting surfaces (6) is directly opposite to a light guide plate (8).

4. The heat spreader of claim 1, wherein: A plurality of screw holes (7) are further formed in the long-side plate (3) of the heat-dissipating aluminum plate (1).

5. The heat spreader of claim 4, wherein: The screw hole (7) is a countersunk hole.

6. The heat spreader of claim 5, wherein: Four screw holes (7) are formed in the long-side plate (3) of the heat-dissipating aluminum plate (1).

7. The heat spreader of claim 5, wherein: When the size of the display is greater than 32 inches, the number of the screw holes (7) is greater than or equal to five.

8. A side-lit backlight module using the heat sink plate according to any one of claims 1-7, characterized in that: The side-in type backlight module further comprises a lamp strip (4), a light guide plate (8), a diaphragm (10) and a reflecting paper (9), the lamp strip (4) is drawer-type assembled in the lamp strip clamping groove (2), the reflecting paper (9) is attached to the long-side plate (3) of the heat-dissipating aluminum plate (1), the diaphragm (10) is arranged on the opposite side of the reflecting paper (9), and the light guide plate (8) is arranged between the diaphragm (10) and the reflecting paper (9) and on the opposite side of the lamp strip clamping groove (2).

9. The edge-lit backlight of claim 8, wherein: The lamp strip (4) is in interference fit with the lamp strip clamping groove (2).

10. The edge-lit backlight of claim 9, wherein: The LED lamp bead (5) of the lamp strip (4) is located in the light-transmitting groove.

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