LED packaging structure, backlight assembly and liquid crystal screen

Abstract

The utility model discloses an LED packaging structure, a backlight assembly and a liquid crystal screen. The LED packaging structure comprises a support and a light-emitting chip set. The bracket is provided with a light emitting hole; the light-emitting chip group comprises a red light chip, a green light chip and a blue light chip, and the light-emitting chip group is arranged at the bottom of the light outlet hole; the packaging adhesive is arranged in the light outlet hole and covers the light-emitting chip group; wherein the peripheral wall of the light outlet hole can block light. A red light chip, a green light chip and a blue light chip of the light-emitting chip set can form a high color gamut, the light-emitting chip set is installed at the bottom of the light-emitting hole, the packaging glue covers the light-emitting chip set, and due to the fact that the peripheral wall of the light-emitting hole can block light rays, the light rays emitted by the light-emitting chip set can only be emitted out from the hole opening of the light-emitting hole, and the light-emitting chip set can emit light from the light-emitting hole. The light is emitted into the center of the lens in an approximate point light source normal light emitting mode, so that the final emergent light is relatively uniform, the problems of light spots and color stripes at the emergent light edge are reduced, and the use effect is improved.

Description

Technical Field

[0001] The utility model relates to the field of liquid crystal displays, and particularly to an LED packaging structure, a backlight assembly and a liquid crystal display screen. Background Art

[0002] In some existing liquid crystal display screens, RGB chips can be used in the LED packaging structure of the backlight assembly, that is, a red light chip, a green light chip and a blue light chip are respectively arranged in the LED packaging structure, so that the NTSC color gamut can reach a high color gamut of 110% to 130%. At present, in the existing LED packaging structure, due to the different light-emitting positions of the RGB chips, after being matched with a lens, light spots and color patterns are likely to appear at the light-emitting edge, affecting the use effect. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, the utility model provides an LED packaging structure which can reduce the problems of light spots and color patterns at the light-emitting edge and improve the use effect after being matched with a lens.

[0004] The utility model also provides a backlight assembly with the above-mentioned LED packaging structure.

[0005] The utility model also provides a liquid crystal display screen with the above-mentioned backlight assembly.

[0006] The LED packaging structure according to the first aspect embodiment of the utility model includes a bracket and a light-emitting chip group. The bracket is provided with a light-emitting hole; the light-emitting chip group includes a red light chip, a green light chip and a blue light chip, and the light-emitting chip group is arranged at the bottom of the light-emitting hole; a packaging glue is arranged in the light-emitting hole and covers the light-emitting chip group; wherein the peripheral wall of the light-emitting hole can block light.

[0007] The LED packaging structure according to the first aspect embodiment of the utility model has at least the following beneficial effects: the red light chip, the green light chip and the blue light chip of the light-emitting chip group can form a high color gamut. The light-emitting chip group is installed at the bottom of the light-emitting hole, and the packaging glue covers the light-emitting chip group. Since the peripheral wall of the light-emitting hole can block light, the light emitted by the light-emitting chip group can only be emitted from the orifice of the light-emitting hole, and enters the center of the lens in a manner similar to the normal light emission of a point light source, so that the final light emission is relatively uniform, thereby reducing the problems of light spots and color patterns at the light-emitting edge and improving the use effect.

[0008] According to some embodiments of the utility model, a light-blocking layer is coated on the peripheral wall of the light-emitting hole.

[0009] According to some embodiments of the utility model, the light-blocking layer is a white light-blocking layer.

[0010] According to some embodiments of the present utility model, the cross-section of the light-emitting hole is circular, and the light-emitting hole is a conical hole or a cylindrical hole.

[0011] According to some embodiments of the present utility model, the red light chip, the green light chip, and the blue light chip are arranged at intervals in a straight line direction.

[0012] According to some embodiments of the present utility model, the bracket includes an insulating base and three conductor block groups. Each conductor block group includes two conductor blocks. The conductor block groups are arranged on the insulating base, and the positive and negative electrodes of the red light chip, the green light chip, and the blue light chip are electrically connected to the two conductor blocks of different conductor block groups respectively.

[0013] According to some embodiments of the present utility model, a first lens is further included. The first lens is arranged on the bracket and located at the orifice end of the light-emitting hole.

[0014] The backlight assembly according to the embodiment of the second aspect of the present utility model includes a circuit board and a backlight source. The backlight source is arranged on the circuit board, and the backlight source has the above-mentioned LED packaging structure.

[0015] The backlight assembly according to the embodiment of the second aspect of the present utility model has at least the following beneficial effects: due to the adoption of the above-mentioned LED packaging structure, the phenomena such as light spots and color patterns at the light-emitting edge of the backlight assembly are reduced, and the light-emitting effect of the backlight assembly is improved.

[0016] According to some embodiments of the present utility model, a second lens is further included. The second lens is arranged on the circuit board and opposite to the light-emitting side of the LED packaging structure.

[0017] The liquid crystal display screen according to the embodiment of the third aspect of the present utility model includes the above-mentioned backlight assembly, a liquid crystal assembly, and a film material part. The film material part includes at least one diffusion film and / or brightness enhancement film, and the film material part is located between the backlight assembly and the liquid crystal assembly.

[0018] The liquid crystal display screen according to the embodiment of the third aspect of the present utility model has at least the following beneficial effects: due to the adoption of the above-mentioned LED packaging structure, the imaging effect of the liquid crystal display screen is improved.

[0019] The additional aspects and advantages of the present utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present utility model. Description of the Drawings

[0020] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0021] Figure 1Schematic perspective view of an LED packaging structure according to an embodiment of the present utility model;

[0022] Figure 2 According to the present utility model Figure 1 Cross-sectional schematic view of the LED packaging structure;

[0023] Figure 3 According to the present utility model Figure 1 Exploded schematic view of the LED packaging structure;

[0024] Figure 4 Schematic perspective view of an LED packaging structure according to another embodiment of the present utility model;

[0025] Figure 5 Schematic structure view of a liquid crystal screen according to an embodiment of the present utility model.

[0026] Reference numerals:

[0027] Backlight assembly 10, film material part 20, liquid crystal assembly 30;

[0028] Bracket 100, light-emitting hole 110, insulating seat 120, conductor block 130;

[0029] Light-emitting chip group 200, red light chip 210, green light chip 220, blue light chip 230;

[0030] Encapsulation glue 300;

[0031] Light-blocking layer 400;

[0032] First lens 500. Detailed implementation manners

[0033] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0034] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as up, down, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0035] In the description of the present utility model, "a plurality of" refers to more than two. If the first and the second are described only for the purpose of distinguishing technical features, they cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features or implicitly specifying the sequence relationship of the indicated technical features.

[0036] In the description of the present utility model, unless otherwise clearly defined, terms such as "arrangement", "installation", "connection", etc. shall be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0037] Most of the existing liquid crystal displays usually use the method of exciting phosphors with a blue light chip 230. The NTSC color gamut can reach 70% to 100%, and it can be used in combination with a secondary lens, with a relatively good cost performance. There are also some existing liquid crystal displays that use the method of exciting red phosphors with a blue light chip 230 and a green light chip 220. The NTSC color gamut can reach 80% to 110%, but the cost is relatively high and the light distribution is relatively difficult. There are also some existing liquid crystal displays in which RGB chips can be used in the LED packaging structure of the backlight assembly 10, that is, a red light chip 210, a green light chip 220, and a blue light chip 230 are respectively arranged in the LED packaging structure, so that the NTSC color gamut can reach a high color gamut of 110% to 130%. In the current LED packaging structure, due to the different light-emitting positions of the RGB chips, after being combined with a lens, light spots and color patterns are likely to appear at the light-emitting edge, affecting the use effect.

[0038] Referring to Figures 1 to 5 , the LED packaging structure of the embodiment of the present utility model includes a bracket 100 and a light-emitting chip group 200. The bracket 100 is provided with a light-emitting hole 110; the light-emitting chip group 200 includes a red light chip 210, a green light chip 220, and a blue light chip 230, and the light-emitting chip group 200 is arranged at the bottom of the light-emitting hole 110; a packaging adhesive 300 is arranged in the light-emitting hole 110 and covers the light-emitting chip group 200; wherein the peripheral wall of the light-emitting hole 110 can block light.

[0039] The red light chip 210, the green light chip 220, and the blue light chip 230 of the light-emitting chip group 200 can form a high color gamut. The light-emitting chip group 200 is installed at the bottom of the light-emitting hole 110, and the packaging adhesive 300 covers the light-emitting chip group 200. Since the peripheral wall of the light-emitting hole 110 can block light, the light emitted by the light-emitting chip group 200 can only be emitted from the orifice of the light-emitting hole 110, and is incident into the center of the lens in a manner similar to the normal light emission of a point light source, so that the final light emission is relatively uniform, thereby reducing the problems of light spots and color patterns at the light-emitting edge and improving the use effect.

[0040] In an embodiment, the peripheral wall of the light-emitting hole 110 is coated with a light-blocking layer 400. By providing the light-blocking layer 400, a part of the light from the light-emitting chip group 200 can be blocked by the peripheral wall of the light-emitting hole 110, so that the remaining light can emit light in a unified direction from the light-emitting hole 110, forming a point light source with approximate normal light emission, and the use effect is good.

[0041] In an embodiment, the light-blocking layer 400 is a white light-blocking layer 400. By using the white light-blocking layer 400, the loss of light can be reduced. Specifically, the light-blocking layer 400 can be silica gel containing titanium dioxide or aluminum oxide, epoxy resin containing titanium dioxide or aluminum oxide, or modified epoxy silicone resin containing titanium dioxide or aluminum oxide.

[0042] It can be imagined that in some other embodiments, a light-blocking block can also be provided at the bracket 100. The light-blocking block is provided with a light-emitting hole 110. The light-blocking block is made of a non-light-transmitting material, and the light-blocking block directly blocks the light emitted by the light-emitting chip group 200, thereby forming a point light source with approximate normal light emission; or the entire bracket 100 is made of a non-light-transmitting material, and the light-emitting hole 110 is opened on the bracket 100.

[0043] In an embodiment, the cross-section of the light-emitting hole 110 is circular, which can better form an approximate point light source and has a better light-emitting effect.

[0044] In an embodiment, the light-emitting hole 110 is a conical hole or a cylindrical hole. When the light-emitting hole 110 is a conical hole or a cylindrical hole, the light emitted by the light-emitting chip group 200 can be such that the normal light-emitting part can be emitted through the orifice of the light-emitting hole 110, forming an approximate point light source, while other light is blocked by the peripheral wall of the light-emitting hole 110, making the light-emitting effect relatively uniform; when the light-emitting hole 110 is a conical hole, the utilization rate of light is better.

[0045] It can be imagined that the shape of the light-emitting hole 110 can also be other shapes, such as a prism hole or a prism hole, etc. Those skilled in the art can configure it specifically according to actual needs.

[0046] In an embodiment, the red light chip 210, the green light chip 220, and the blue light chip 230 are arranged at intervals in a straight line direction, which is convenient for installing the red light chip 210, the green light chip 220, and the blue light chip 230 to the bottom of the light-emitting hole 110 of the bracket 100, simplifies the production process, and has a better light-emitting effect.

[0047] In some other embodiments, the red light chip 210, the green light chip 220, and the blue light chip 230 can also be arranged in other ways. For example, the red light chip 210, the green light chip 220, and the blue light chip 230 are arranged in a triangular pattern; or any other arrangement method.

[0048] Specifically, the red light chip 210 , the green light chip 220 , and the blue light chip 230 may be upright chips or vertical chips.

[0049] Specifically, the red chip 210, the green chip 220 and the blue chip 230 are attached to the bracket 100 by a bonding adhesive, and the installation method is relatively convenient and firm. When the red chip 210, the green chip 220 and the blue chip 230 are upright chips, the bonding adhesive is generally silicone, epoxy resin or silicone doped with alumina. When the red chip 210, the green chip 220 and the blue chip 230 are vertical chips, the bonding adhesive is generally conductive silver glue or solder paste.

[0050] In the embodiment, the bracket 100 includes an insulating seat 120 and three conductor block groups, the conductor block group includes two conductor blocks 130, the conductor block group is arranged on the insulating seat 120, and the positive and negative electrodes of the red light chip 210, the green light chip 220 and the blue light chip 230 are respectively electrically connected to the two conductor blocks 130 of different conductor block groups. By electrically connecting the red light chip 210, the green light chip 220 and the blue light chip 230 in a one-to-one correspondence with different conductor block groups, it is convenient to independently adjust the power of the red light chip 210, the green light chip 220 and the blue light chip 230, which is conducive to forming a relatively suitable mixed color light.

[0051] Specifically, the insulating seat 120 is an injection molded part and can be made of materials such as PCT plastic, high temperature resistant nylon, epoxy resin or silicone, etc., and has a good insulation effect.

[0052] Specifically, the conductor block 130 is a metal piece and can be made of metal materials such as copper, iron, aluminum, aluminum alloy, tin, etc., which has a good conductive effect.

[0053] In some embodiments, the LED packaging structure further includes a first lens 500, which is disposed on the bracket 100 and located at the opening end of the light emitting hole 110. The first lens 500 is disposed on the packaging structure, so that the packaging structure can be equipped with the first lens 500, which meets the specified light emitting range, the product has strong applicability, and the production cost is low.

[0054] Specifically, the first lens 500 is made of a transparent material, such as silicone, epoxy resin, or modified epoxy silicone resin. The first lens 500 can be mounted on the bracket 100 by gluing, or can be directly molded on the bracket 100 by molding.

[0055] Specifically, the packaging glue 300 is provided to improve the waterproof, moisture-proof, shock-proof, dust-proof and heat-dissipating capabilities of the light-emitting chip group 200 , and reduce the risk of damage to the light-emitting chip group 200 .

[0056] Specifically, the encapsulant 300 can be made of transparent materials such as silica gel, epoxy resin, or modified epoxy silicone resin, which have good light transmittance.

[0057] In the embodiment, the red light chip 210 is electrically connected to the corresponding conductor block 130 through a bonding wire, the green light chip 220 is electrically connected to the corresponding conductor block 130 through a bonding wire, and the blue light chip 230 is electrically connected to the corresponding conductor block 130 through a bonding wire, so that the position layout of the red light chip 210, the green light chip 220, and the blue light chip 230 is relatively free. The bonding wire can be made of, for example, gold wire, silver wire, copper wire, aluminum wire, or alloy wire.

[0058] When producing the LED packaging structure, the red chip, green chip, and blue chip of the light-emitting chip group 200 can be first pasted onto the bracket 100 through an adhesive die, and then the red chip, green chip, and blue chip are electrically connected to the corresponding conductor blocks 130 using bonding wires. After that, the light-emitting chip group 200 is covered and protected with the encapsulant 300, and then the light-blocking layer 400 is coated on the hole wall of the light-emitting hole 110. If the LED packaging structure needs to be provided with a lens, the first lens 500 can be adhesively bonded to the hole end of the light-emitting hole 110, and finally, the LED packaging structure is subjected to spectral sorting and taping packaging.

[0059] The present utility model also proposes a backlight assembly 10, which includes a circuit board and a backlight source. The backlight source is disposed on the circuit board, and the backlight source has the above-mentioned LED packaging structure. Due to the adoption of the above-mentioned LED packaging structure, the phenomenon of light spots and color patterns appears at the light-emitting edge of the backlight assembly 10 is reduced, and the light-emitting effect of the backlight assembly 10 is improved.

[0060] Specifically, the circuit board can be made of materials such as aluminum circuit board, fiberglass board, and FPC flexible board; the second lens can be made of materials such as polymethyl methacrylate, polycarbonate, polystyrene, COC plastic, or ABS plastic.

[0061] In some embodiments, the backlight assembly 10 further includes a second lens, and the second lens is disposed on the circuit board and opposite to the light-emitting side of the LED packaging structure. The setting of the second lens is beneficial to adjusting the light-emitting effect of the backlight assembly 10, reducing the number of LED packaging structures used, and having good optical uniformity.

[0062] Specifically, the first lens 500 and the second lens are usually used alternatively. For example, in some embodiments, if the LED packaging structure has the first lens 500, the backlight assembly 10 does not need to be provided with the second lens. In other embodiments, if the LED packaging structure does not have the first lens 500, the backlight assembly 10 needs to be provided with the second lens. Usually, the production cost of the first lens 500 is lower than that of the second lens. Therefore, directly setting the first lens 500 in the LED packaging structure has a relatively low cost.

[0063] The present utility model further provides a liquid crystal display screen, which includes the above-mentioned backlight assembly 10, liquid crystal assembly 30 and film material part 20. The film material part 20 includes at least one diffusion film and / or brightness enhancement film, and the film material part 20 is located between the backlight assembly 10 and the liquid crystal assembly 30. Due to the adoption of the above-mentioned LED packaging structure, the imaging effect of the liquid crystal display screen is improved.

[0064] Specifically, the film material part 20 can be a certain number of diffusion films, brightness enhancement films or a combination of both. The film sheet of the diffusion film can be made of PET material, polymethyl methacrylate material or polycarbonate, etc. The surface of the film sheet is coated with a resin mixture containing optical diffusing particles, or an uneven structure is formed on the surface of the film sheet by micro-engraving; the brightness enhancement film can be made of PET material, polymethyl methacrylate material or polycarbonate, etc. Patterns such as diamonds, semi-circles, triangles, etc. can be set on the surface of the brightness enhancement film.

[0065] Specifically, the liquid crystal assembly 30 can include a lower polarizer, thin film transistor TFT, liquid crystal molecules, color filter, upper polarizer, etc.

[0066] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0067] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and purposes of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. An LED packaging structure, characterized in that: include: The bracket (100) is provided with a light exit hole (110); A light-emitting chip group (200), comprising a red light chip (210), a green light chip (220) and a blue light chip (230), wherein the light-emitting chip group (200) is arranged at the bottom of the light-emitting hole (110); A packaging glue (300) is disposed on the light exit hole (110) and covers the light emitting chip group (200); Wherein, the peripheral wall of the light exit hole (110) can block light.

2. The LED packaging structure according to claim 1, characterized in that: The peripheral wall of the light exit hole (110) is coated with a light blocking layer (400).

3. The LED packaging structure according to claim 2, characterized in that: The light blocking layer (400) is a white light blocking layer (400).

4. The LED packaging structure according to claim 1, characterized in that: The cross section of the light exit hole (110) is circular, and the light exit hole (110) is a conical hole or a cylindrical hole.

5. The LED packaging structure according to claim 1, characterized in that: The red light chip (210), the green light chip (220) and the blue light chip (230) are arranged at intervals along a straight line.

6. The LED packaging structure according to claim 1, characterized in that: The support (100) comprises an insulating seat (120) and three conductor block groups, wherein the conductor block group comprises two conductor blocks (130), the conductor block group is arranged on the insulating seat (120), and the positive and negative electrodes of the red light chip (210), the green light chip (220) and the blue light chip (230) are respectively electrically connected to the two conductor blocks (130) of different conductor block groups.

7. The LED packaging structure according to claim 1, characterized in that: It also includes a first lens (500), which is arranged on the bracket (100) and located at the opening end of the light exit hole (110).

8. A backlight assembly, characterized in that: include: Circuit board; A backlight source is arranged on the circuit board, and the backlight source has the LED packaging structure according to any one of claims 1 to 7.

9. The backlight assembly according to claim 8, characterized in that: It also includes a second lens, which is arranged on the circuit board and opposite to the light emitting side of the LED packaging structure.

10. A liquid crystal display, characterized in that: include: The backlight assembly (10) as claimed in claim 8; Liquid crystal assembly (30); The film material portion (20) comprises at least one diffusion film and / or brightness enhancement film, and the film material portion (20) is located between the backlight assembly (10) and the liquid crystal assembly (30).

Images