3D-LED display screen

Abstract

The utility model discloses a 3D-LED display screen which comprises a PCB, and LED lamp beads are distributed on the surface of the PCB in an array mode. Wherein the surface of each LED lamp bead is coated with a mutually independent linear polarizer, and the surface of each linear polarizer is coated with a phase difference film, so that the circular polarizers of each pixel column are in the same optical rotation direction, and the optical rotation directions of the circular polarizers of the adjacent pixel columns are opposite; and the surfaces of the circular polarizers are coated with protective layers. In the manufacturing process of the LED lamp beads, the left-handed or right-handed circular polarizers are pre-pasted on the production lines, and then the LED lamp beads with the pre-arranged circular polarizers are arranged on the PCB at intervals, so that the problems that in a traditional scheme, phase difference films and linear polarizers are arranged in order, and accurate alignment between the phase difference films and the linear polarizers and the LED lamp beads is difficult are solved. The technical process can be effectively simplified, the technical difficulty is reduced, the dependence on a complex grating type phase difference film is reduced, meanwhile, the production efficiency can be improved, and large-batch production can be achieved.

Description

Technical Field

[0001] This utility model relates to the field of display screen technology, specifically to a 3D-LED display screen. Background Technology

[0002] The existing LED displays achieve 3D display effects mainly by stacking a composite polarizing film assembly on the display surface. This assembly consists of a linear polarizer substrate and a phase retardation film. The fabrication process of the phase retardation film mainly includes two methods: one is to coat the surface of the linear polarizer with a liquid crystal polymer (LC), then apply ultraviolet polarized light irradiation after masking to induce left-handed nematic phase alignment. After curing, the mask is removed, and secondary ultraviolet polarized light irradiation is performed to form a right-handed nematic phase region. The other method is to coat a resin material and then stack it on the surface of the linear polarizer substrate. A directional stretching process is used to induce birefringence in the resin film to achieve optical phase modulation.

[0003] The related technologies face two key technical challenges in the preparation of phase retardation films: First, the orderly arrangement of left-handed and right-handed phase regions on the surface of the linear polarizer substrate presents a challenge in controlling the alignment accuracy, which can easily lead to cumulative deviations in phase retardation. Second, when bonding the composite polarizing film assembly to the LED display screen, it is necessary to ensure that the optical rotation phase units of each pixel column and the corresponding LED bead array achieve sub-micron level spatial matching. This alignment accuracy requirement is extremely high, and existing bonding processes are prone to axial offset, which leads to an increase in the crosstalk rate of the stereoscopic display and ultimately affects the naked-eye 3D visual effect. Utility Model Content

[0004] The purpose of this utility model is to provide a 3D-LED display screen in order to solve the above problems.

[0005] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0006] A 3D-LED display screen includes a PCB board, wherein LED beads are arrayed on the surface of the PCB board.

[0007] Each LED bead has an independent linear polarizer attached to its surface, and a phase difference film is attached to the surface of the linear polarizer so that the circular polarizers in each pixel column have the same optical rotation direction, while the optical rotation directions of the circular polarizers in adjacent pixel columns are opposite.

[0008] The surface of each circular polarizer is covered with a protective layer.

[0009] As a further description of the above technical solution, the circular polarizer includes a linear polarizer, the lower surface of the linear polarizer is coated with an adhesive layer, and the upper surface of the linear polarizer is provided with a second phase difference film.

[0010] As a further description of the above technical solution, the circular polarizer includes a linear polarizer, the lower surface of the linear polarizer is provided with a first phase difference film, the lower surface of the first phase difference film is coated with an adhesive layer, and the upper surface of the linear polarizer is provided with a second phase difference film.

[0011] As a further description of the above technical solution, the phase retardation film is an LC liquid crystal layer or a resin layer.

[0012] As a further description of the above technical solution, the LC liquid crystal layer includes at least one of nematic phase, cholesteric phase, smectic phase, and ferroelectric liquid crystal.

[0013] As a further description of the above technical solution, the resin layer includes any one of polycarbonate, cyclic olefin, acrylic, and PET.

[0014] As a further description of the above technical solution, the thickness of the LC liquid crystal layer is 1-4 μm.

[0015] As a further description of the above technical solution, the thickness of the resin layer is 20-70 μm.

[0016] As a further description of the above technical solution, the thickness of the linear polarizer is 70-170 μm.

[0017] As a further description of the above technical solution, the thickness of the adhesive layer is 10-250 μm.

[0018] The beneficial effects of this utility model are as follows:

[0019] This invention solves the problem of difficult alignment between the phase retardation film and the linear polarizer, and the precise alignment of them with the LEDs, in the traditional method of attaching a whole circular polarizer to the display screen. This is achieved by pre-attaching left-hand or right-hand circular polarizers on separate production lines during LED chip manufacturing, ensuring that each LED chip has an independent circular polarizer. The LED chips with pre-attached circular polarizers are then spaced apart on the PCB board. This effectively simplifies the process, reduces technical difficulty, decreases reliance on complex grating-type phase retardation films, and improves production efficiency, enabling mass production.

[0020] To more clearly illustrate the structural features and functions of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram showing the distribution of circular polarizers on LED beads in the 3D-LED display screen provided by this utility model;

[0022] Figure 2This is a cross-sectional view of the circular polarizer and the LED display screen in the 3D-LED display screen provided by this utility model.

[0023] Figure 3 This is a cross-sectional view of a single LED bead combined with a circular polarizer in this utility model;

[0024] Figure 4 This is a cross-sectional view of another embodiment of the 3D-LED display screen provided by this utility model, in which a circular polarizer is combined with an LED display screen.

[0025] Figure 5 This is a cross-sectional view of another embodiment of the 3D-LED display screen provided by this utility model, in which a circular polarizer is combined with an LED display screen.

[0026] Reference numerals: 1. PCB board; 2. LED beads; 3. Circular polarizer; 301. Linear polarizer; 302. Adhesive layer; 303. First phase retardation film; 304. Second phase retardation film; 4. Protective layer. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0028] like Figures 1-3 As shown, in one embodiment, a 3D-LED display screen includes a PCB board 1, on which a plurality of LED beads 2 are arrayed on the surface of the PCB board 1, wherein the connection between the PCB board 1 and the LED beads 2 can be soldering.

[0029] Each LED bead 2 has an independent linear polarizer 301 attached to its surface. A phase retardation film is also attached to the surface of the linear polarizer 301. The linear polarizer 301, the phase retardation film, and the adhesive layer 302 at the bottom of the linear polarizer 301 together form a circular polarizer 3. It should be noted that the circular polarizer 3 does not refer to a perfectly circular shape, but rather to a polarizer capable of converting linearly polarized light into circularly polarized light. By attaching the phase retardation film to the surface of the linear polarizer 301, the circular polarizers 3 in each pixel column all have the same optical rotation direction, while the optical rotation directions of the circular polarizers 3 in adjacent pixel columns are opposite.

[0030] For example, if the rotation direction of the circular polarizer 3 in a certain pixel column is to the left, then the rotation direction of the circular polarizer 3 in the adjacent pixel columns is to the right.

[0031] Through the above technical solution, each independent LED bead 2 has an independent circular polarizer 3 attached to its surface. The circular polarizer 3 corresponding to the optical rotation direction can be attached to the surface of the LED bead 2 according to the actual polarization standard and manufacturing requirements. Subsequently, several LED beads 2 are arranged in a pixel column with the optical rotation direction of the circular polarizer 3 to the left, and the optical rotation direction of the circular polarizer 3 in adjacent pixel columns to the right. Compared to the prior art, which involves precisely arranging the optical rotation direction at intervals on the same circular polarizer 3 and attaching it to the LED display surface to achieve precise positioning and matching between the LED beads 2 and the optical rotation phase unit, this application effectively reduces the process difficulty, reduces the dependence on grating-type circular polarizer 3, and is more conducive to mass production. Furthermore, it eliminates the need to manufacture circular polarizers 3 with different intervals to adapt to displays with different LED bead intervals, effectively reducing costs.

[0032] The process steps for pre-setting an independent circular polarizer 3 on the surface of an independent LED bead 2 are as follows:

[0033] After the LED beads 2 are manufactured, while they are still placed on the LED bracket without being cut, a circular polarizer 3 is attached to the surface of the LED beads 2. It should be noted that the circular polarizer 3 has only one direction of rotation; for example, the entire circular polarizer 3 is left-handed. After attachment, the LED beads 2 on the LED bracket are cut to obtain several LED beads 2 with left-handed circular polarizers 3 attached. Similarly, several LED beads 2 with right-handed circular polarizers 3 are attached to the surface of several LED beads 2 on another LED bracket, and after the same operation, several LED beads 2 with right-handed circular polarizers 3 attached are obtained. The groups of LED beads 2 with left-handed and right-handed circular polarizers 3 attached are alternately soldered in columns onto the surface of the PCB board 1, and then surface-protected encapsulated to obtain the final 3D-LED display screen.

[0034] During surface protection encapsulation, a protective layer is applied to the surface of the circular polarizer 3. The protective layer can be transparent or, depending on the specific requirements, a frosted finish.

[0035] Optionally, such as Figure 2-3 As shown, in this embodiment, the circular polarizer 3 includes a linear polarizer 301. The lower surface of the linear polarizer 301 is coated with an adhesive layer 302, the thickness of which is 10-250 μm. A second phase retardation film 304 is disposed on the upper surface of the linear polarizer 301. This phase retardation film is either an LC liquid crystal layer or a resin layer. The LC liquid crystal layer includes at least one of nematic, cholesteric, smectic, and ferroelectric liquid crystals. The resin layer includes any one of polycarbonate, cycloolefin, acrylic, and PET. The thickness of the LC liquid crystal layer is 1-4 μm. The thickness of the resin layer is 20-70 μm.

[0036] The thickness of the linear polarizing layer is 70-170 μm, and in some embodiments, the thickness of the linear polarizing layer can also be 50 μm, 200 μm, 220 μm and 240 μm, etc.

[0037] Optionally, such as Figure 4 As shown, in another embodiment, the circular polarizer 3 includes a linear polarizer 301. A first phase retardation film 303 is disposed on the lower surface of the linear polarizer 301, and an adhesive layer 302 is coated on the lower surface of the first phase retardation film 303. A second phase retardation film 304 is disposed on the upper surface of the linear polarizer 301. Compared with the previous embodiment, this embodiment adds a phase retardation film between the linear polarizer layer and the adhesive layer 302. This achieves the above advantages while also masking white spots on the LED display screen, making the entire display screen appear pure black, which is more comfortable and natural.

[0038] refer to Figure 5 In one embodiment, it includes a PCB board 1, on which an array of LED beads with multiple pixel columns is distributed. A linear polarizer 301 is attached to the surface of each LED bead 2, wherein the linear polarizer 301 is adhered to the surface of the LED bead 2 by an adhesive layer 302. The absorption axes of the linear polarizers 301 on the surfaces of adjacent pixel columns of LED beads 2 are perpendicular to each other. A second phase retardation film 304 is attached to the surface of the linear polarizer 301. It should be noted that, unlike the above embodiment, the phase retardation film is an uncut phase retardation film, and the entire phase retardation film has the same optical rotation direction, such as only left-handed or only right-handed. Compared to the existing technology that achieves precise arrangement of the rotation direction at intervals on the same circular polarizer 3 and attaches the circular polarizer 3 to the surface of the LED display screen to make the LED beads 2 and the rotation phase unit precisely positioned and matched, this application can effectively reduce the process difficulty, reduce the dependence on the grating-type circular polarizer 3, and is more conducive to mass production. At the same time, it eliminates the need to manufacture circular polarizers 3 with different intervals to adapt to the display screen with different lamp bead intervals, which can effectively reduce costs.

[0039] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A 3D-LED display screen, characterized in that, The PCB board is provided with an array of LED lamp beads on its surface; Each LED lamp bead is provided with a mutually independent linear polarizer on its surface, and a phase difference film is provided on the surface of the linear polarizer, so that the circular polarizers of each pixel column have the same optical rotation direction, and the optical rotation directions of the circular polarizers of adjacent pixel columns are opposite. The surface of the circular polarizer is provided with a protective layer.

2. The 3D-LED display screen according to claim 1, characterized in that, The circular polarizer comprises the linear polarizer, the lower surface of the linear polarizer is coated with a glue layer, and the upper surface of the linear polarizer is provided with a second phase difference film.

3. The 3D-LED display screen of claim 1, wherein, The circular polarizer comprises the linear polarizer, the lower surface of the linear polarizer is provided with a first phase difference film, the lower surface of the first phase difference film is coated with a glue layer, and the upper surface of the linear polarizer is provided with a second phase difference film.

4. The 3D-LED display according to claim 2 or 3, characterized in that, The phase difference film is an LC liquid crystal layer or a resin layer.

5. The 3D-LED display screen according to claim 4, characterized in that, The LC liquid crystal layer comprises at least any one of nematic phase, cholesteric, smectic phase, and ferroelectric liquid crystal.

6. The 3D-LED display screen according to claim 4, characterized in that, The resin layer comprises any one of polycarbonate, cycloolefin, acrylic, and PET.

7. The 3D-LED display screen according to claim 4, characterized in that, The thickness of the LC liquid crystal layer is 1-4 μm.

8. The 3D-LED display screen of claim 4, wherein, The thickness of the resin layer is 20-70 μm.

9. The 3D-LED display according to claim 2 or 3, characterized in that, The thickness of the linear polarizer is 70-170 μm.

10. The 3D-LED display according to claim 2 or 3, characterized in that, The thickness of the glue layer is 10-250 μm.

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