Frameless backlight assembly

Abstract

The utility model relates to the technical field of display devices, and discloses a frameless backlight assembly which comprises a lamp panel, a light guide plate and an optical film piece which are sequentially stacked from bottom to top. The lamp panel comprises a circuit board and a plurality of lamp beads, a first through hole is formed in the center of the circuit board, the lamp beads are distributed around the periphery of the first through hole, and the light emitting ends of the lamp beads face the edge of the circuit board; a second through hole is formed in the center of the light guide plate, the light inlet end of the light guide plate is located on the edge of the second through hole, and the light inlet end of the light guide plate corresponds to the light outlet end of the lamp bead. The backlight assembly has the advantages that the lamp beads are distributed in the center of the circuit board, the light emitting ends of the lamp beads face the edge of the circuit board, light of the backlight assembly can be distributed more evenly, the problem of poor optical taste caused by alternation of bright and dark areas in a display area of the backlight assembly is solved, and the display effect of the backlight assembly is improved. Therefore, the overall optical display effect of the backlight assembly is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of display devices, and particularly relates to a frameless backlight assembly. Background Art

[0002] As a crucial component of display devices, the backlight assembly primarily provides the light source for the display device, enabling it to display properly. With the advancement of technology and improvements in quality of life, users are increasingly seeking thinner and lighter display devices. The key to achieving this thinness lies in the thinness of the backlight assembly. Frameless backlight assemblies are now available on the market, and their use in display device production facilitates this thinness.

[0003] In the prior art, in order to meet certain special usage requirements, a circular or quasi-circular frameless backlight assembly is required. The existing circular frameless backlight assembly usually arranges LED lamps at the edge of the circuit board, and the light-emitting end of the LED lamp faces the center of the circuit board, such as Figure 1 As shown, this arrangement easily leads to uneven light distribution of the backlight assembly, alternating light and dark areas in the display area, and other poor optical quality problems, which seriously affect the optical display effect of the backlight assembly. Utility Model Content

[0004] In order to address the deficiencies of the prior art, the present invention provides a frameless backlight assembly. By arranging the lamp beads in the center of the circuit board so that the light-emitting ends of the lamp beads face the edge of the circuit board, the light distribution of the backlight assembly can be made more uniform, solving the problem of poor optical quality caused by alternating light and dark areas in the display area of ​​the backlight assembly, thereby improving the overall optical display effect of the backlight assembly.

[0005] The technical effects to be achieved by the present invention are achieved through the following technical aspects:

[0006] The utility model provides a frameless backlight assembly, comprising a lamp panel, a light guide plate and an optical film component stacked in sequence from bottom to top;

[0007] The lamp board includes a circuit board and a plurality of lamp beads, a first through hole is opened at the center of the circuit board, and the plurality of lamp beads are arranged around the periphery of the first through hole, with the light emitting ends of the lamp beads facing the edge of the circuit board;

[0008] A second through hole is opened at the center of the light guide plate, the light entrance end of the light guide plate is located at the edge of the second through hole, and the light entrance end of the light guide plate corresponds to the light exit end of the lamp bead.

[0009] As a further description of the technical solution of the present invention, the light incident end of the light guide plate is provided with an optical groove, and the optical groove is formed from the light incident end of the light guide plate toward the light incident end away from the light guide plate.

[0010] As a further description of the technical solution of the present invention, the optical groove is V-shaped and there are multiple of them, and the multiple optical grooves are arranged at equal intervals along the light incident end of the light guide plate.

[0011] As a further description of the technical solution of the present invention, the light guide plate includes a first side surface and a second side surface arranged opposite to each other, the first side surface is connected to the circuit board, the second side surface is connected to the optical film, and a plurality of optical protrusion structures are arranged on the first side surface.

[0012] As a further description of the technical solution of the present invention, the size of the optical protrusion structure close to the second through hole is smaller than the size of the optical protrusion structure far from the second through hole.

[0013] As a further description of the technical solution of the present invention, the distribution density of the optical protrusion structure close to the second through hole is smaller than the distribution density of the optical protrusion structure far from the second through hole.

[0014] As a further description of the technical solution of the present invention, the optical film comprises a light-scattering film and a surface film arranged above the light-scattering film, and light-shielding glue is attached between the light-scattering film and the surface film.

[0015] As a further description of the technical solution of the present invention, a first fixing glue is attached between the light guide plate and the circuit board, and a second fixing glue is attached between the light diffusion film and the light guide plate.

[0016] As a further description of the technical solution of the present utility model, the lamp board, the light guide plate and the optical film are all irregular circles, an annular display area is provided on the light board, and the light-shielding glue, the first fixing glue and the second fixing glue are all provided with light-transmitting parts at positions corresponding to the annular display area.

[0017] As a further description of the technical solution of the present invention, the first through hole and the second through hole are both square, each side of the first through hole corresponds to a lamp bead, and each side of the second through hole corresponds to the front of each lamp bead.

[0018] In summary, the present invention has at least the following advantages:

[0019] The frameless backlight assembly provided by the present invention opens a first through hole at the center of the circuit board, arranges multiple lamp beads around the periphery of the first through hole, and directs the light-emitting ends of the lamp beads toward the edge of the circuit board. This enables the light emitted by each lamp bead to be more divergent, and the light distribution of the backlight assembly to be more uniform, thereby solving the problem of poor optical quality such as alternating light and dark areas in the display area of ​​the backlight assembly, and effectively improving the overall optical display effect of the backlight assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A light distribution diagram of a backlight assembly in the prior art;

[0021] Figure 2 This is an overall exploded view of the frameless backlight assembly of Example 1 of the present utility model;

[0022] Figure 3 This is a light distribution diagram of the frameless backlight assembly of Example 1 of the present utility model;

[0023] Figure 4 This is a structural diagram of a light guide plate according to Example 2 of the present utility model;

[0024] Figure 5 for Figure 4 Enlarged view of part A;

[0025] Figure 6 This is a schematic structural diagram of the optical protrusion structure of Example 2 of the present utility model;

[0026] Figure 7 This is an overall exploded view of the frameless backlight assembly of Example 3 of the present utility model.

[0027] Markings in the figure:

[0028] 1. Light board; 11. Circuit board; 12. Lamp beads; 13. First through hole; 14. Ring display area;

[0029] 2. Light guide plate; 21. Second through hole; 22. Optical groove; 23. First side surface; 24. Second side surface; 25. Optical protrusion structure;

[0030] 3. Optical film; 31. Diffuser film; 32. Surface film; 33. Shading glue;

[0031] 4. First fixing glue; 5. Second fixing glue; 6. Light-transmitting part. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1

[0035] refer to Figures 2 to 3 The frameless backlight assembly provided in this embodiment includes a lamp board 1, a light guide plate 2 and an optical film 3 stacked in sequence from bottom to top. Since the backlight assembly is not provided with an outer frame, but is directly composed of the lamp board 1, the light guide plate 2 and the optical film 3 stacked in sequence, it is more conducive to achieving the lightweight and thinness of the backlight assembly, thereby achieving the lightweight and thinness of the display device.

[0036] The light board 1 includes a circuit board 11 and multiple lamp beads 12. A first through-hole 13 is defined in the center of the circuit board 11. Multiple lamp beads 12 are evenly spaced around the periphery of the first through-hole 13, with the light-emitting ends of the lamp beads 12 facing the edge of the circuit board 11. A second through-hole 21 is defined in the center of the light guide plate 2. The light-incoming end of the light guide plate 2 is located at the edge of the second through-hole 21, and the light-incoming end of the light guide plate 2 corresponds to the light-emitting end of the lamp beads 12. In some embodiments, the number of lamp beads 12 can be three or more, preferably four. In this embodiment, the circuit board 11 is an FPC board.

[0037] It is understood that the plurality of lamp beads 12 are all located in the second through hole 21, and the edge of the second through hole 21 is located directly in front of the lamp beads 12. The plurality of lamp beads 12 are gathered at the center of the circuit board 11 and simultaneously emit light to the periphery. Through the light guiding effect of the light guide plate 2, a display area is formed on the light board 1. Figure 3 As shown, since the plurality of lamp beads 12 are arranged around the periphery of the first through hole 13, the spacing between two adjacent lamp beads 12 is small, and the emitted light is spread outward to the edge of the circuit board 11, with good dispersion. Therefore, the light distribution on the backlight assembly is more divergent and uniform, and there will be no obvious dark areas in the display area, and it is not easy to have bad optical taste phenomena such as alternation of light and dark areas in the display area, thereby effectively improving the overall optical display effect of the backlight assembly.

[0038] The frameless backlight assembly of this embodiment, by opening a first through hole at the center position of the circuit board, arranges multiple lamp beads around the periphery of the first through hole, and makes the light-emitting ends of the lamp beads face the edge of the circuit board. This can make the light distribution of the backlight assembly more divergent and more uniform, thereby solving the problem of poor optical quality such as alternating light and dark areas in the display area of ​​the backlight assembly, and effectively improving the overall optical display effect of the backlight assembly.

[0039] Example 2

[0040] As a further optimization of Example 1, refer to Figures 4 to 6 The light-entering end of the light guide plate 2 is provided with a plurality of optical grooves 22, extending from the light-entering end of the light guide plate 2 toward the light-entering end away from the light guide plate 2. Light emitted by the lamp beads 12 enters the interior of the light guide plate 2 through the optical grooves 22. When the light reaches the inner wall of the optical grooves 22, it is refracted. The refraction angles of different light rays vary, making the light emitted by the lamp beads 12 more divergent, and forming a surface light source from a point light source. The light distribution is more uniform, thereby making the display brightness of the backlight assembly display area more uniform, further improving the display effect.

[0041] In a preferred embodiment, the optical grooves 22 are V-shaped and multiple in number, and the multiple optical grooves 22 are evenly spaced along the light-entering end of the light guide plate 2. The V-shaped optical grooves 22 can achieve a better and more uniform light divergence effect, and the light refracted between two adjacent optical grooves 22 will intersect, which is beneficial for enhancing display brightness. This can not only improve the divergence and uniformity of the backlight assembly light, eliminate the phenomenon of poor optical quality, but also enhance display brightness and improve optical quality.

[0042] As a further optimization, the light guide plate 2 includes a first side surface 23 and a second side surface 24 disposed opposite each other. The first side surface 23 is connected to the circuit board 11, and the second side surface 24 is connected to the optical film 3. A plurality of optical protrusions 25 are provided on the first side surface 23. Light emitted by the lamp beads 12 enters the light guide plate 2 through the optical grooves 22. When the light reaches the optical protrusions 25, it is refracted again. Different light rays, due to the different positions at which they arrive at the optical protrusions 25, are refracted at different angles. This further improves the divergence of the light from the backlight assembly, making the light distribution more uniform, improving the consistency of the display brightness, and enhancing the optical quality.

[0043] As a further optimization, the size of the optical protrusion structure 25 near the second through hole 21 is smaller than the size of the optical protrusion structure 25 far from the second through hole 21. The distribution density of the optical protrusion structure 25 near the second through hole 21 is lower than the distribution density of the optical protrusion structure 25 far from the second through hole 21. It can be understood that the optical protrusion structures 25 are arranged in multiple circles along the second through hole 21 to the edge of the light guide plate 2, and the size and distribution density of each circle of optical protrusion structures 25 gradually increase from the second through hole 21 to the edge of the light guide plate 2.

[0044] Since the light distribution near the second through hole 21 is relatively dense, while the light distribution near the edge of the light guide plate 2 is relatively sparse, the optical protrusion structure 25 near the second through hole 21 is set to be small in size and low in distribution density, which can reduce the refraction of light, while the optical protrusion structure 25 near the edge of the light guide plate 2 is set to be large in size and high in distribution density, which can enhance the refraction of light, so that the light near the light guide plate 2 forms more intersections, thereby enhancing the display brightness at the edge of the light guide plate 2, making the overall display brightness of the backlight assembly more balanced and uniform, and the optical taste effect is better.

[0045] The frameless backlight assembly of this embodiment, by setting optical grooves, can make the light emitted by the lamp beads more divergent and the light distribution more uniform, thereby making the display brightness of the display area of ​​the backlight assembly more uniform, further improving the display effect; by setting the optical grooves to be V-shaped and in multiple numbers, not only can the divergence and uniformity of the backlight assembly light be improved, but also the display brightness can be enhanced and the optical quality effect can be improved; by setting optical protrusion structures and making reasonable size settings and arrangements, the consistency of the display brightness of the backlight assembly can be improved, further improving the optical quality effect.

[0046] Example 3

[0047] As a further optimization of Example 2, refer to Figure 7 The optical film component 3 includes a diffuser film 31 and a surface film 32 disposed above the diffuser film 31. In this embodiment, the surface film 32 is a surface release film that protects the diffuser film 31. A light-shielding adhesive 33 is affixed between the diffuser film 31 and the surface film 32. The light-shielding adhesive 33 prevents light leakage and helps ensure the normal display effect of the backlight assembly. In some embodiments, the diffuser film 31 and the light-shielding adhesive 33 are each provided with a first avoidance hole corresponding to and matching the first through hole 13, so that they can cover the top of the lamp bead 12, while providing a diffuser effect and providing a certain degree of protection for the lamp bead 12.

[0048] A first fixing adhesive 4 is applied between the light guide plate 2 and the circuit board 11, and a second fixing adhesive 5 is applied between the light diffuser film 31 and the light guide plate 2. The first fixing adhesive 4 is provided with a second clearance hole that corresponds to and matches the second through hole 21, and the second fixing adhesive 5 is provided with a third clearance hole that corresponds to and matches the first through hole 13. The first fixing adhesive 4 connects and secures the light guide plate 2 to the circuit board 11, while the second fixing adhesive 5 connects and secures the light diffuser film 31 to the light guide plate 2. This prevents the light guide plate 2 and the light diffuser film 31 from shifting or falling off during transportation or use, ensuring proper operation of the backlight assembly.

[0049] In this embodiment, the lamp board 1, the light guide plate 2 and the optical film 3 are all irregular circles. An annular display area 14 is provided on the light board 1 between the first through hole 13 and the edge of the circuit board 11. The light-shielding glue 33, the first fixing glue 4 and the second fixing glue 5 are all provided with light-transmitting portions 6 at positions corresponding to the annular display area 14, thereby ensuring the normal display of the annular display area 14.

[0050] In some embodiments, the first through hole 13 and the second through hole 21 are both square in shape. Each side of the first through hole 13 corresponds to a lamp bead 12, and each side of the second through hole 21 is located in front of each lamp bead 12. The four lamp beads 12 are arranged symmetrically in a mirror-image arrangement. The light coverage range of each lamp bead 12 is generally greater than 90 degrees. Therefore, the overlapping light coverage ranges of the four lamp beads 12 can completely cover the display area of ​​the backlight assembly. The display area does not have obvious dark areas, and poor optical quality issues such as alternating light and dark areas are less likely to occur, further improving the optical quality of the backlight assembly.

[0051] The frameless backlight assembly of this embodiment can prevent light leakage by providing light-shielding glue, thereby ensuring the normal display of the backlight assembly; by providing the first fixing glue and the second fixing glue, it can prevent the light guide plate and the diffuser film from shifting and loosening, thereby ensuring the normal use of the backlight assembly; by setting the first through hole and the second through hole to be square and evenly arranging the four lamp beads, it can ensure that the display area is completely covered by light, further improving the overall optical quality effect of the backlight assembly.

[0052] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0053] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0054] In the present invention, unless otherwise expressly specified or limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0055] Although the present invention has been described with reference to the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and variations based on the above content. Therefore, all such substitutions, modifications and variations are included within the spirit and scope of the appended claims.

Claims

1. A frameless backlight assembly, characterized in that: It comprises a light panel (1), a light guide plate (2) and an optical film (3) stacked in sequence from bottom to top; The lamp board (1) comprises a circuit board (11) and a plurality of lamp beads (12); a first through hole (13) is provided at the center of the circuit board (11); the plurality of lamp beads (12) are arranged around the periphery of the first through hole (13), and light-emitting ends of the lamp beads (12) face the edge of the circuit board (11); A second through hole (21) is provided at the center of the light guide plate (2), a light input end of the light guide plate (2) is located at the edge of the second through hole (21), and the light input end of the light guide plate (2) corresponds to the light output end of the lamp bead (12).

2. The frameless backlight assembly according to claim 1, wherein: The light entrance end of the light guide plate (2) is provided with an optical groove (22), and the optical groove (22) is formed by opening from the light entrance end of the light guide plate (2) toward the light entrance end away from the light guide plate (2).

3. The frameless backlight assembly according to claim 2, wherein: The optical grooves (22) are V-shaped and are multiple in number. The multiple optical grooves (22) are arranged at equal intervals along the light incident end of the light guide plate (2).

4. The frameless backlight assembly according to claim 3, wherein: The light guide plate (2) comprises a first side surface (23) and a second side surface (24) disposed opposite to each other, the first side surface (23) being connected to the circuit board (11), the second side surface (24) being connected to the optical film (3), and a plurality of optical protrusion structures (25) being provided on the first side surface (23).

5. The frameless backlight assembly according to claim 4, wherein: The size of the optical protrusion structure (25) close to the second through hole (21) is smaller than the size of the optical protrusion structure (25) far from the second through hole (21).

6. The frameless backlight assembly according to claim 5, wherein: The distribution density of the optical protrusion structure (25) close to the second through hole (21) is smaller than the distribution density of the optical protrusion structure (25) far from the second through hole (21).

7. The frameless backlight assembly according to claim 1, wherein: The optical film component (3) comprises a light-scattering film (31) and a surface film (32) arranged above the light-scattering film (31), and a light-shielding adhesive (33) is attached between the light-scattering film (31) and the surface film (32).

8. The frameless backlight assembly according to claim 7, wherein: A first fixing glue (4) is attached between the light guide plate (2) and the circuit board (11), and a second fixing glue (5) is attached between the light diffusion film (31) and the light guide plate (2).

9. The frameless backlight assembly according to claim 8, wherein: The light board (1), the light guide plate (2) and the optical film (3) are all irregularly circular, an annular display area (14) is provided on the light board (1), and light-transmitting portions (6) are provided at positions of the light-shielding adhesive (33), the first fixing adhesive (4) and the second fixing adhesive (5) corresponding to the annular display area (14).

10. The frameless backlight assembly according to any one of claims 1 to 9, wherein: The first through hole (13) and the second through hole (21) are both square in shape; each side of the first through hole (13) corresponds to one of the lamp beads (12); and each side of the second through hole (21) corresponds to the front of each of the lamp beads (12).

Images