Mini LED backlight source structure and display

Abstract

The utility model discloses a Mini LED backlight source structure and a display, the backlight source structure comprises a back plate, a diffusion plate, a PCB, LED lamp beads and a reflection cup, the PCB and the diffusion plate are arranged on the back plate, an air layer is formed between the PCB and the diffusion plate, a plurality of LED lamp beads are uniformly arranged on the PCB at intervals, the distance between the LED lamp beads is at least 7 pitches, and the reflection cup is arranged on the back plate. The PCB is further provided with a plurality of reflection cups, openings of the reflection cups face the diffusion plate, and the LED lamp beads are arranged in the centers of the reflection cups in a one-to-one correspondence mode. The display comprises the backlight source structure. Light rays are gathered in a certain area through the reflection cup, then the light rays emitted by the LED at the bottom are evenly diffused through the diffusion plate, and the height of the whole reflection cup is smaller than the distance of an air layer, so that the purpose of reducing the backlight thickness is achieved, the light rays can be gathered to a certain degree, and the purpose of reducing halo can be achieved.

Description

Technical Field

[0001] The utility model relates to the field of display technology, and in particular to a Mini LED backlight source structure and a display. Background Art

[0002] Currently, the POB solution for Mini LED backlights uses a bottom PCB with LEDs of uniform spacing across the entire surface. An air layer (i.e., the OD value) is added above the LEDs, and a diffuser is used to evenly diffuse the light emitted by the bottom LEDs across the entire surface. To save costs, the number of LEDs needs to be reduced, which increases the spacing between the LEDs. However, the larger the spacing, the greater the air layer distance, which increases the overall thickness of the backlight. Therefore, a backlight structure that can reduce costs without increasing the thickness of the backlight is urgently needed. Utility Model Content

[0003] In order to overcome the shortcomings of the existing technology, the utility model provides a Mini LED backlight structure and display, which focuses light in a certain area through a reflective cup, and then evenly diffuses the light emitted by the bottom LED through a diffuser plate. The overall height of the reflective cup is lower than the previous air layer distance, thereby achieving the purpose of reducing the backlight thickness, and the light will also be concentrated to a certain extent, which can achieve the purpose of reducing halo.

[0004] On the one hand, the technical solution provided by the present invention is:

[0005] A Mini LED backlight module includes a backplate, a diffuser, a PCB, LED lamp beads, and a reflector cup. The PCB and the diffuser are arranged on the backplate, an air layer is formed between the PCB and the diffuser, a plurality of LED lamp beads are evenly spaced on the PCB, and the spacing between the LED lamp beads is at least 7 pitches. The PCB is also provided with a plurality of reflector cups, the openings of the reflector cups facing the diffuser, and the plurality of LED lamp beads are arranged one-to-one in the centers of the plurality of reflector cups.

[0006] As a further improvement of the above technical solution, the reflective cup includes a bottom plate and a conical side wall connected to the edge of the bottom plate. A lamp hole is provided in the middle of the bottom plate, and the LED lamp bead is located in the lamp hole.

[0007] As a further improvement of the above technical solution, the inclination angle of the side wall of the reflective cup relative to the vertical direction is 15°-25°.

[0008] As a further improvement of the above technical solution, the refraction angle of the light emitted by the LED lamp bead on the side wall of the reflective cup is 20°-30°.

[0009] As a further improvement of the above technical solution, the height of the reflective cup is 1.0 mm-2.5 mm.

[0010] As a further improvement of the above technical solution, the height of the reflective cup and the distance between the reflective cup and the diffuser plate are 0-1.0 mm.

[0011] As a further improvement of the above technical solution, the cup openings of a plurality of the reflective cups are sequentially connected together and formed as one piece.

[0012] As a further improvement of the above technical solution, the bottom of the reflective cup is adhered to the PCB board by double-sided tape.

[0013] As a further improvement of the above technical solution, a QD film, a diffusion film, a lower BEF film, an upper BEF film, a DBEF film and a liquid crystal panel are sequentially arranged on the diffusion plate.

[0014] On the other hand, the technical solution provided by the present invention is:

[0015] A Mini LED display includes the backlight source structure of the above technical solution.

[0016] The beneficial effects of this invention are: by adding reflective cups at specific angles and heights to focus light within a specific area, and then using a diffuser to evenly diffuse the light emitted by the bottom LED, the overall height of the reflective cups is lower than the previous air layer distance, thereby reducing the thickness of the backlight and concentrating the light to a certain extent, thereby achieving the goal of reducing halo. Specifically, compared with the existing technology, this invention has a thinner backlight thickness, which can be reduced to 1mm-2mm; a better halo of the backlight, which can be reduced from 40% to approximately 25%; and a higher brightness of the backlight, which can be increased to approximately 10%. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the Mini LED backlight structure of the utility model;

[0019] Figure 2 This is a light conduction schematic diagram of a Mini LED backlight structure of the present invention.

[0020] Figure numerals: 1, back panel; 2, PCB board; 3, LED lamp beads; 4, reflective cup; 5, diffusion plate; 6, QD film; 7, diffusion film; 8, lower BEF film; 9, upper BEF film; 10, DBEF film; 11, LCD panel. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention. In addition, all the connection / connection relationships involved in the patent do not simply refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. For example, fixed connection / fixed installation can be selected from screw connection, bolt connection, pin connection, key connection, bonding, mortise and tenon connection, welding, riveting and other methods as needed. For detachable connection, screw connection, bolt connection, threaded connection, snap connection, mortise and tenon connection, Velcro connection and other methods can be selected as needed. The various technical features in the creation of the present invention can be combined interchangeably without conflicting with each other.

[0022] An example of the present invention provides a Mini LED display, including a backlight structure, which provides a uniform surface light source for the display.

[0023] Reference Figure 1 、 Figure 2 An embodiment of the present utility model provides a Mini LED backlight source structure for use in the above-mentioned Mini LED display, including a back plate 1, a diffuser plate 5, a PCB board 2, LED lamp beads 3 and a reflector cup 4, wherein the PCB board 2 and the diffuser plate 5 are arranged on the back plate 1, and an air layer OD is formed between the PCB board 2 and the diffuser plate 5. A plurality of LED lamp beads 3 are evenly spaced on the PCB board 2, and the spacing between the LED lamp beads 3 is at least 7 pitches (that is, the spacing between two adjacent LED lamp beads 3 is at least 7 units, which is mm in this embodiment, that is, the spacing between two LED lamp beads 3 is 7 mm). A plurality of reflector cups 4 are also provided on the PCB board 2, and the opening of the reflector cup 4 faces the diffuser plate 5. The plurality of LED lamp beads 3 are arranged one-to-one in the center of the plurality of reflector cups 4.

[0024] Specifically, the reflective cup 4 includes a bottom plate and a conical side wall connected to the edge of the bottom plate. A lamp hole is provided in the middle of the bottom plate, and the LED lamp bead 3 is located in the lamp hole. The side wall of the reflective cup 4 has an inclination angle R relative to the vertical direction of 15°-25°, preferably 18°, so that the refraction angle of the light emitted by the LED lamp bead 3 on the side wall of the reflective cup 4 is 20°-30° (refer to Figure 2), and in addition, the height H of the reflector cup 4 is 1.0mm-2.5mm, so that the distance between the height of the reflector cup 4 and the diffuser plate 5 can be 0-1.0mm, even if the air layer OD formed between the PCB board 2 and the diffuser plate 5 is 2-2.5mm. Compared with the prior art, this embodiment, without changing the other diaphragm structures, adds a reflector cup 4. The reflector cup 4 reshapes the light propagation path, adds a 0.5mm air layer, and then diffuses the light evenly through the diffuser plate 5. This can reduce the overall thickness of the backlight structure by at least 1mm-2mm. At the same time, the addition of the reflector cup 4 improves the halo effect, reducing it from the previous 40% to approximately 25%. In addition, the brightness of the backlight structure is also higher, which can be increased to approximately 10%.

[0025] In some embodiments, the cup mouths of multiple reflective cups 4 are connected together in sequence and formed as one piece, which can facilitate the manufacture of the reflective cups 4. In addition, all reflective cups 4 are installed on the back plate 1 at the same time, avoiding the need to install each reflective cup 4 on the back plate 1 one by one, thereby greatly improving the installation efficiency.

[0026] Preferably, the bottom of the reflector cup 4 is adhered to the PCB board 2 by double-sided tape. Such a setting of double-sided tape will not cause damage to the reflector cup 4 and the PCB board 2, and at the same time facilitates the installation and maintenance of the reflector cup 4, greatly improving assembly efficiency.

[0027] In this embodiment, the diffuser plate 5 is sequentially provided with a QD film 6, a diffuser film 7, a lower BEF film 8, an upper BEF film 9, a DBEF film 10, and a liquid crystal panel 11. The QD film 6 (quantum dot film) improves color performance, increases brightness uniformity, and reduces power consumption; the diffuser film 7 ensures uniform brightness and soft colors on the display screen; the lower BEF film 8 (lower brightness enhancement film) and the upper BEF film 9 (upper brightness enhancement film) work together to achieve the best display effect; and the DBEF film 10 (dual brightness enhancement film) significantly improves display quality and energy efficiency, providing users with a better visual experience.

[0028] The above is a specific description of the preferred implementation of the present invention, but the invention of the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A Mini LED backlight structure, characterized by: It includes a back plate, a diffuser plate, a PCB board, LED lamp beads and a reflector cup. The PCB board and the diffuser plate are arranged on the back plate, and an air layer is formed between the PCB board and the diffuser plate. A plurality of LED lamp beads are evenly spaced on the PCB board, and the spacing between the LED lamp beads is at least 7 pitches. A plurality of reflector cups are also provided on the PCB board, and the openings of the reflector cups face the diffuser plate. The plurality of LED lamp beads are arranged one-to-one in the center of the plurality of reflector cups.

2. The Mini LED backlight structure according to claim 1, wherein: The reflective cup includes a bottom plate and a conical side wall connected to the edge of the bottom plate. A lamp hole is provided in the middle of the bottom plate, and the LED lamp bead is located in the lamp hole.

3. The Mini LED backlight structure according to claim 2, wherein: The side wall of the reflective cup has an inclination angle of 15°-25° relative to the vertical direction.

4. The Mini LED backlight structure according to claim 3, wherein: The refraction angle of the light emitted by the LED lamp bead on the side wall of the reflective cup is 20°-30°.

5. The Mini LED backlight structure according to claim 1, wherein: The height of the reflective cup is 1.0 mm to 2.5 mm.

6. The Mini LED backlight structure according to claim 5, wherein: The height of the reflective cup and the distance between the diffuser plate are 0-1.0 mm.

7. The Mini LED backlight structure according to claim 1, wherein: The cup openings of the plurality of reflective cups are sequentially connected together and formed as one piece.

8. The Mini LED backlight structure according to claim 7, wherein: The bottom of the reflective cup is adhered to the PCB board by double-sided tape.

9. The Mini LED backlight structure according to claim 8, wherein: The diffusion plate is sequentially provided with a QD film, a diffusion film, a lower BEF film, an upper BEF film, a DBEF film and a liquid crystal panel.

10. A Mini LED display, characterized in that: The backlight source structure comprises the backlight source structure according to any one of claims 1 to 9.

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