Side-incoming double-layer backlight device

Abstract

The utility model relates to liquid crystal display field field, the utility model discloses a side -in type double -deck backlight device, solved the problem of poor light source uniformity, the support subassembly includes frame, backlight bottom plate and front frame, the backlight bottom plate with the front frame is spaced apart and set up on the frame, be provided with display screen on the front frame, the light source subassembly includes the light bar and light guide plate, the light guide plate sets up between the backlight bottom plate with the display screen, first lamp pearl group and second lamp pearl group are misaligned arrangement along the length direction of light bar, double -deck design directly increased the arrangement space of light source in height direction, can arrange the first lamp pearl group and second lamp pearl group of nearly two times number on the light bar of unit length and break the periodic bright and dark stripe of single light -entering surface, make the light from the moment that enters light guide plate start more sufficient mixing, realize high uniformity light source, therefore solved the problem of poor light source uniformity.

Description

Technical Field

[0001] This utility model relates to the field of liquid crystal displays, and in particular to a side-lit dual-layer backlight device. Background Technology

[0002] Liquid crystal displays (LCDs) do not emit light themselves and rely on backlight modules to provide a light source. Backlight modules are mainly divided into two types: direct-lit and edge-lit. Edge-lit backlight modules place linear light sources (such as LED strips) on the side of a light guide plate (LGP). After entering the light guide plate, the light is scattered and reflected by the dots or microstructures on the bottom surface of the light guide plate, and finally emitted uniformly from the light-emitting surface, thus forming a surface light source. Due to its advantages such as thin and light structure and low cost, it is widely used in consumer electronics products such as smartphones, tablets, laptops, monitors, and televisions. However, traditional edge-lit backlight modules have some inherent technical bottlenecks that limit their performance.

[0003] To improve uniformity, existing technologies typically employ measures such as optimizing the dot pattern design of the light guide plate, adding optical films such as diffusion films / brightness enhancement films, or adding light guide adhesive (LGP) or reflective strips between the light strip and the light guide plate. Optimizing the dot pattern design is a complex process and requires extremely high manufacturing standards. Utility Model Content

[0004] The purpose of this invention is to provide a side-lit double-layer backlight device, which solves the problem of poor light source uniformity.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This invention provides a side-lit dual-layer backlight device, including a support assembly and a light source assembly, wherein the light source assembly is mounted on the support assembly. The support component includes a frame, a backlight base plate, and a front frame. The backlight base plate and the front frame are spaced apart on the frame, and a display screen is provided on the front frame. The light source assembly includes a light strip and a light guide plate, the light guide plate being disposed between the backlight base plate and the display screen, and the light strip being disposed at the edge of the light guide plate; The light source assembly further includes a first group of LED beads and a second group of LED beads, which are arranged side by side on the light strip and staggered along the extension direction of the light strip.

[0006] Optionally, the light source assembly further includes a circuit board, the circuit board and the lamp strip are respectively disposed on both sides of the backlight base plate, the circuit board is connected to an external power supply, and the circuit board is used to supply power to the first lamp bead group and the second lamp bead group.

[0007] Furthermore, the first LED group and the second LED group are electrically connected to the circuit board.

[0008] Furthermore, the first LED group includes at least one first LED and one second LED, the second LED group includes at least one third LED and one fourth LED, there is a first gap between the first LED and the second LED, there is a second gap between the third LED and the fourth LED, the third LED or the fourth LED is located in the extending direction of the first gap, and the first LED or the second LED is located in the extending direction of the second gap.

[0009] Furthermore, the first LED and the second LED are connected in series to form the first LED group, and several first LED groups are then connected in parallel.

[0010] Furthermore, the third and fourth LED beads are connected in series to form the second LED bead group, and several second LED bead groups are then connected in parallel.

[0011] Optionally, the backlight base plate is disposed within the front frame.

[0012] Optionally, the light source assembly further includes a heat sink strip, which is disposed around the inner wall of the front frame, and the light strip is disposed on the heat sink strip.

[0013] Optionally, the light source assembly further includes reflective paper disposed on the backlight substrate, with the first LED group and the second LED group located between the reflective paper and the light guide plate.

[0014] Optionally, the support assembly further includes a cover, which is disposed on the upper end of the front frame, and heat dissipation holes are provided on the side of the cover, which are located on the back of the backlight base plate.

[0015] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: This utility model's side-lit double-layer backlight device, because the first and second LED groups are arranged side-by-side on the light strip and staggered along the length of the light strip, directly increases the space for light source arrangement in the height direction. Nearly twice the number of first and second LED groups can be arranged on a unit length of light strip, thus significantly improving the total luminous flux injected into the light guide plate within a unit length. The high-intensity light source, which was originally concentrated on a straight line, is "diffused" in space, breaking the periodic bright and dark stripes of a single light-incident surface. This allows the light to begin mixing more fully from the moment it enters the light guide plate, achieving a highly uniform light source, thus solving the problem of poor light source uniformity. Attached Figure Description

[0016] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a perspective view of a side-lit dual-layer backlight device according to a preferred embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the first and second LED groups within the front frame; Figure 3 This is a view showing the arrangement of the first LED group, the second LED, the third LED, and the fourth LED; Figure 4 yes Figure 1 The stereoscopic view shown is from a second perspective. Figure 5 This is a partial structural view of the light source component; Figure 6 This is the circuit diagram for the first and second LED groups.

[0017] The reference numerals in the attached figures are explained as follows: 1. Support assembly; 2. Light source assembly; 11. Frame; 12. Backlight base plate; 13. Front frame; 14. Display screen; 15. Cover; 16. Heat dissipation hole; 17. Rubber block; 21. LED strip; 22. Light guide plate; 23. First LED bead group; 24. Second LED bead group; 25. Circuit board; 26. Heat dissipation strip; 27. Reflective paper; 28. Optical film; 230. First gap; 231. First LED bead; 232. Second LED bead; 240. Second gap; 241. Third LED bead; 242. Fourth LED bead. Detailed Implementation

[0018] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0021] like Figure 1 and Figure 2 and Figure 3 The side-lit dual-layer backlight device shown includes a support assembly 1 and a light source assembly 2. The light source assembly 2 is mounted on the support assembly 1. The support assembly 1 includes a frame 11, a backlight base plate 12, and a front frame 13. The backlight base plate 12 and the front frame 13 are spaced apart on the frame 11. The backlight base plate 12 is fixed to the frame 11 by bolts. The front frame 13 is welded to the frame 11. A display screen 14 is mounted on the front frame 13. The display screen 14 is snapped onto the front frame 13. The backlight base plate 12 and the display screen 14 are located at opposite ends of the front frame 13. The backlight base plate 12 can also be fixed to the front frame 13 by bolts.

[0022] The light source assembly 2 includes a light strip 21 and a light guide plate 22. The light guide plate 22 is disposed between the backlight base plate 12 and the display screen 14, and the light strip 21 is disposed at the edge of the light guide plate 22.

[0023] The light source assembly 2 also includes a first LED group 23 and a second LED group 24. The first LED group 23 and the second LED group 24 are arranged side by side on the light strip 21. The first LED group 23 and the second LED group 24 are staggered along the extension direction of the light strip 21. Therefore, the first LED group 23 and the second LED group 24 are also arranged around the light guide plate 22. The first LED group 23 and the second LED group 24 are located between the light strip 21 and the light guide plate 22.

[0024] The backlight base plate 12 is set inside the front frame 13 and is snapped into the front frame 13.

[0025] The light source assembly 2 also includes a heat sink 26, which is arranged around the inner wall of the front frame 13 and is fixed to the front frame 13 by bolts. The light strip 21 is arranged on the heat sink 26 and is attached to the heat sink 26. The heat sink 26 not only plays a role in heat dissipation, but also provides support for the front frame 13.

[0026] The light source assembly 2 also includes a circuit board 25. The circuit board 25 and the lamp strip 21 are respectively disposed on both sides of the backlight base plate 12. The circuit board 25 is fixed to the backlight base plate 12 by bolts. The circuit board 25 is connected to an external power supply and is used to supply power to the first lamp bead group 23 and the second lamp bead group 24.

[0027] The support assembly 1 also includes a cover 15, which is disposed on the upper end of the front frame 13. A heat dissipation hole 16 is provided on the side of the cover 15. The heat dissipation hole 16 is located on the back of the backlight base plate 12. The heat dissipation hole 16 and the reflective paper 27 are located in opposite directions of the backlight base plate 12. The cover 15 can prevent rainwater from falling on the upper end of the front frame 13. In addition, the heat dissipation hole 16 can dissipate heat.

[0028] like Figure 4 and Figure 5 and Figure 6 As shown, the light source assembly 2 also includes reflective paper 27, which is disposed on the backlight base plate 12. The reflective paper 27 is pasted on the backlight base plate 12, and the reflective paper 27 helps to increase reflection.

[0029] The light source assembly 2 also includes an optical film 28, which is disposed between the light guide plate 22 and the display screen 14. The optical film 28 is snapped into the front frame 13, and the number of optical films 28 is set as needed.

[0030] The first LED group 23 and the second LED group 24 are electrically connected to the circuit board 25. The first LED group 23 and the second LED group 24 are connected in parallel and then electrically connected to the circuit board 25. In this way, the circuit board 25 can adjust the first LED group 23 and the second LED group 24 at the same time, or the first LED group 23 and the second LED group 24 can be electrically connected to the circuit board 25 individually, and the circuit board 25 can adjust the first LED group 23 and the second LED group 24 respectively.

[0031] The first LED group 23 includes at least one first LED 231 and one second LED 232, and the second LED group 24 includes at least one third LED 241 and one fourth LED 242. The first LED 231, the second LED 232, the third LED 241 and the fourth LED 242 are located at the endpoints of a parallelogram. There is a first gap 230 between the first LED 231 and the second LED 232, and a second gap 240 between the third LED 241 and the fourth LED 242. The third LED 241 or the fourth LED 242 is located in the extension direction of the first gap 230, and the first LED 231 or the second LED 232 is located in the extension direction of the second gap 240.

[0032] In this way, the first LED 231 and the second LED 232 are on a straight line, and the third LED 241 and the fourth LED 242 are on the same straight line, but the LEDs on the first LED group 23 and the LEDs on the second LED group 24 are staggered in the longitudinal direction.

[0033] The first LED 231 and the second LED 232 are connected in series to form the first LED group 23. Several first LED groups 23 are then connected in parallel. In this way, if one of the first LED groups 23 is broken, it will not affect the normal operation of the other first LED groups 23.

[0034] The third LED 241 and the fourth LED 242 are connected in series to form the second LED group 24. Several second LED groups 24 are then connected in parallel. In this way, if one of the second LED groups 24 is broken, it will not affect the normal operation of the other second LED groups 24.

[0035] The length of the first LED group 23 and the second LED group 24 is less than the length or width of the backlight base plate 12. Therefore, the length of the LED strip 21 and the light guide plate 22 is also less than the length or width of the backlight base plate 12. The light guide plate 22 is longer than the LED strip 21, the first LED group 23 and the second LED group 24. A rubber block 17 is provided on the front frame 13. The rubber block 17 is snapped onto the front frame 13 and can be removed from the front frame 13. Multiple rubber blocks 17 are set at the four corners of the front frame 13. In this way, the light guide plate 22 is snapped between multiple rubber blocks 17. Each LED strip 21 has two rubber blocks 17 at both ends. The first LED group 23 and the second LED group 24 are also located between two rubber blocks 17.

[0036] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the protection scope of this utility model.

Claims

1. A side-lit dual-layer backlight device, comprising a support assembly (1) and a light source assembly (2), wherein the light source assembly (2) is disposed on the support assembly (1), characterized in that, The support component (1) includes a frame (11), a backlight base plate (12) and a front frame (13). The backlight base plate (12) and the front frame (13) are spaced apart on the frame (11), and a display screen (14) is provided on the front frame (13). The light source assembly (2) includes a light strip (21) and a light guide plate (22). The light guide plate (22) is disposed between the backlight base plate (12) and the display screen (14). The light strip (21) is disposed at the edge of the light guide plate (22). The light source assembly (2) further includes a first LED group (23) and a second LED group (24), which are arranged side by side on the light strip (21) and are staggered along the extension direction of the light strip (21).

2. The side-lit dual-layer backlight device according to claim 1, characterized in that, The light source assembly (2) also includes a circuit board (25), the circuit board (25) and the lamp strip (21) are respectively disposed on both sides of the backlight base plate (12), the circuit board (25) is connected to an external power supply, and the circuit board (25) is used to supply power to the first lamp bead group (23) and the second lamp bead group (24).

3. The side-lit dual-layer backlight device according to claim 2, characterized in that, The first LED group (23) and the second LED group (24) are electrically connected to the circuit board (25).

4. The side-lit dual-layer backlight device according to claim 3, characterized in that, The first LED group (23) includes at least one first LED (231) and one second LED (232), and the second LED group (24) includes at least one third LED (241) and one fourth LED (242). There is a first gap (230) between the first LED (231) and the second LED (232), and there is a second gap (240) between the third LED (241) and the fourth LED (242). The third LED (241) or the fourth LED (242) is located in the extension direction of the first gap (230), and the first LED (231) or the second LED (232) is located in the extension direction of the second gap (240).

5. The side-lit dual-layer backlight device according to claim 4, characterized in that, The first LED bead (231) and the second LED bead (232) are connected in series to form the first LED bead group (23), and several first LED bead groups (23) are then connected in parallel.

6. The side-lit dual-layer backlight device according to claim 4, characterized in that, The third LED (241) and the fourth LED (242) are connected in series to form the second LED group (24), and several second LED groups (24) are then connected in parallel.

7. The side-lit dual-layer backlight device according to claim 1, characterized in that, The backlight base plate (12) is disposed within the front frame (13).

8. The side-lit dual-layer backlight device according to claim 1, characterized in that, The light source assembly (2) also includes a heat sink (26), which is arranged around the inner wall of the front frame (13), and the light strip (21) is arranged on the heat sink (26).

9. The side-lit dual-layer backlight device according to claim 1, characterized in that, The light source assembly (2) also includes reflective paper (27), which is disposed on the backlight base plate (12), and the first LED bead group (23) and the second LED bead group (24) are located between the reflective paper (27) and the light guide plate (22).

10. The side-lit dual-layer backlight device according to claim 1, characterized in that, The support assembly (1) also includes a cover (15), which is disposed on the upper end of the front frame (13). A heat dissipation hole (16) is provided on the side of the cover (15), and the heat dissipation hole (16) is located on the back of the backlight base plate (12).

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