3D-LED display screen packaging process and display screen applying same

Abstract

The invention discloses a 3D-LED display screen packaging process and a display screen and packaging process applying the 3D-LED display screen packaging process. The 3D-LED display screen packaging process comprises the steps that circular polarizers in different optical rotation directions are attached to at least two sets of LED lamp bead arrays arranged on a support; separating the LED lamp bead array attached with the circular polaroid to form a plurality of mutually independent LED lamp beads; and the LED lamp beads are surface-mounted on the PCB. The display screen comprises a display screen substrate; the LED lamp beads are arranged on the surface of the display screen substrate in an array mode. The circular polarizers of each pixel column / row are in the same optical rotation direction, and the optical rotation directions of the circular polarizers of the adjacent pixel columns / rows are opposite. Compared with the prior art, the method has the advantages that the separated LED lamp beads do not need to be subjected to surface mounting on the PCB, and then the polaroid does not need to be precisely attached again. The requirement for the manufacturing precision of the phase difference film is greatly lowered, and the technical difficulty and cost increase caused by high fitting precision in a traditional method are avoided. The production cycle can be shortened while the production cost is reduced, and the method is particularly suitable for large-scale industrial application.

Description

Technical Field

[0001] The present invention belongs to the technical field of display screens, and particularly relates to a 3D-LED display screen packaging process and a display screen applying this process. Background Art

[0002] The manufacturing process of traditional 3D-LED display screens includes the manufacturing of LED lamp beads and the surface mounting of LED lamp beads onto the display screen substrate using the SMT process, and then a polarizer is surface-mounted to achieve a 3D effect. The current polarizer structure includes a linear polarizer and a retardation film attached to the surface of the linear polarizer. In related technologies, the retardation film is generally achieved through two processes. One is to coat a liquid crystal polymer on the surface of the linear polarizer, irradiate with ultraviolet polarized light through a mask to induce a left-handed nematic alignment, and after curing, remove the mask and perform secondary ultraviolet polarized light irradiation to form a right-handed nematic region; the other is to coat a resin material and laminate it on the surface of the linear polarizer substrate, and use a stretching process to make the resin film have birefringence characteristics to achieve optical rotation phase modulation.

[0003] In the actual production and application process of the above processes, whether it is the coating of liquid crystal polymer or the lamination of resin material, it is difficult to precisely control the alignment accuracy of the left-handed and right-handed phase regions, resulting in cumulative deviation of phase delay and when mounting the polarizer on the display screen, it is easy for the optical rotation phase unit to deviate from the LED lamp bead pixel column, and it is difficult to perform precise corresponding mounting, affecting the final imaging effect of the display screen. Therefore, it is necessary to develop a 3D-LED display screen packaging process to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to propose a 3D-LED display screen packaging process and a display screen applying this process to solve the problems in the prior art.

[0005] To this end, the present invention provides a 3D-LED display screen packaging process and a display screen applying this process, including:

[0006] On the one hand, a 3D-LED display screen packaging process, characterized by including:

[0007] S100, performing die bonding, wire bonding, encapsulation, and baking on LED lamp bead materials to form an LED lamp bead array disposed on a bracket;

[0008] S200, surface-mounting circular polarizers with different optical rotation directions on at least two groups of LED lamp bead arrays disposed on the bracket, wherein the optical rotation directions of a single circular polarizer are the same;

[0009] S300, separate the LED lamp bead array after attaching the circular polarizer to form a number of independent LED lamp beads, where each LED lamp bead has a clockwise or counterclockwise polarization direction;

[0010] S400, surface mount the LED lamp beads onto the PCB board. Arrange a number of LED lamp beads with the same polarization direction in a row or column, and alternately solder the single row or column of LED lamp beads onto the surface of the PCB board until the surface mounting process of the display screen is completed.

[0011] As a further description of the above technical solution, it is characterized in that in step S200, it includes LED lamp bead array one and LED lamp bead array two. A circular polarizer one is surface mounted on the surface of the LED lamp bead array one, and a circular polarizer two is surface mounted on the surface of the LED lamp bead array two.

[0012] As a further description of the above technical solution, when the absorption axis of the circular polarizer one is perpendicular to the absorption axis of the circular polarizer two, the optical axes of the retardation films of the circular polarizer one and the circular polarizer two are parallel;

[0013] When the absorption axis of the circular polarizer one is parallel to the absorption axis of the circular polarizer two, the optical axes of the retardation films of the circular polarizer one and the circular polarizer two are perpendicular.

[0014] As a further description of the above technical solution, the angle of the absorption axis is 0 degrees or 90 degrees; and

[0015] +45 degrees or -45 degrees.

[0016] On the other hand, a 3D - LED display screen packaging process includes:

[0017] S100, perform die bonding, wire bonding, encapsulation, and baking on the LED lamp bead materials to form an LED lamp bead array arranged on a bracket;

[0018] S200, surface mount linear polarizers with perpendicular absorption axes on at least two groups of LED lamp bead arrays arranged on brackets;

[0019] S300, separate the LED lamp bead array after attaching the circular polarizer to form a number of independent LED lamp beads, where a number of LED lamp beads have two absorption axis directions and the two directions are perpendicular to each other;

[0020] S400, surface mount a number of LED lamp beads onto the PCB board. Arrange a number of LED lamp beads with the same absorption axis direction in a row or column, and alternately solder the single row or column of LED lamp beads onto the surface of the PCB board until the surface mounting of the LED lamp beads is completed;

[0021] S500, attach the entire retardation film to the surface of the above LED lamp bead array, where the entire retardation film has the same optical axis direction.

[0022] On the other hand, a 3D-LED display screen packaging process includes:

[0023] S100, cut at least two linear polarizers with mutually perpendicular absorption axes into a number of sub-linear polarizers having the same area as a single LED lamp bead;

[0024] S200, surface mount a number of LED lamp beads onto a PCB board;

[0025] S300, alternately surface mount the sub-linear polarizers of different absorption axis pixel columns onto the surface of the LED lamp beads;

[0026] S400, attach the entire retardation film to the surface of the above LED lamp bead array, where the entire retardation film has the same optical axis direction.

[0027] On the other hand, a 3D-LED display screen packaging process includes:

[0028] S100, cut at least two circular polarizers with different optical rotation directions into a number of sub-circular polarizers having the same area as a single LED lamp bead;

[0029] S200, surface mount a number of LED lamp beads onto a PCB board;

[0030] S300, alternately surface mount the sub-circular polarizers of different optical rotation direction pixel columns onto the surface of the LED lamp beads until the surface mounting of all LED lamp beads is completed.

[0031] On the other hand, a display screen applying the 3D-LED display screen packaging process described in any one of the above claims includes:

[0032] A display screen substrate;

[0033] A number of LED lamp bead arrays are arranged on the surface of the display screen substrate, and each LED lamp bead surface is covered with an independent circular polarizer;

[0034] Among them, the circular polarizers of each pixel column / row have the same optical rotation direction, and the circular polarizers of adjacent pixel columns / rows have opposite optical rotation directions.

[0035] As a further description of the above technical solution, the circular polarizer surface-mounted on each LED lamp bead surface sequentially includes from bottom to top:

[0036] An adhesive layer;

[0037] A linear polarizer;

[0038] A retardation film.

[0039] As a further description of the above technical solution, the retardation film is prepared by coating liquid crystal or laminating a resin material.

[0040] Beneficial effects:

[0041] 1. The present invention provides a 3D-LED display screen packaging process and a display screen applying this process, and directly laminates a left-handed or right-handed retardation film on the surface of the LED lamp beads after cutting and separation. Compared with the prior art, this method does not require laminating the separated LED lamp beads onto the PCB board and then accurately laminating the polarizer again. It greatly reduces the requirements for the manufacturing accuracy of the retardation film, and avoids the technical difficulties and cost increase caused by high-precision lamination in the traditional method. It is particularly suitable for large-scale industrial application in terms of reducing production costs and shortening the production cycle. Description of the drawings

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0043] Figure 1 It is a flowchart of the 3D-LED display screen packaging process provided by the present invention.

[0044] Figure 2 It is a schematic flow diagram of the 3D-LED display screen packaging process provided by the present invention.

[0045] Figure 3 It is a schematic flow diagram of another embodiment of the 3D-LED display screen packaging process provided by the present invention.

[0046] Figure 4 It is a schematic flow diagram of another embodiment of the 3D-LED display screen packaging process provided by the present invention.

[0047] Figure 5 It is a cross-sectional view of an embodiment of the 3D-LED display screen provided by the present invention.

[0048] Figure 6 It is a cross-sectional view of a single LED lamp bead in the 3D-LED display screen provided by the present invention.

[0049] Figure 7 It is a cross-sectional view of an embodiment of the 3D-LED display screen provided by the present invention.

[0050] Figure 8A cross-sectional view of an embodiment of the 3D-LED display provided by the present invention.

[0051] In the figure: 1, PCB board; 2, LED lamp beads; 3, adhesive layer; 4, linear polarizer; 5, retardation film; 6, protective layer. Detailed implementation manners

[0052] The content of the present invention can be more easily understood by referring to the following detailed description of the preferred implementation process of the present invention and the included embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. In case of contradiction, the definitions in this specification shall prevail.

[0053] The present invention provides a 3D-LED display encapsulation process and a display using this process, which solves the problems in the related art that in the process of laminating the retardation film and the linear polarizer 4, it is difficult to achieve precise left-handed and right-handed spaced arrangement, and when laminating the circular polarizer onto the LED lamp bead array, it is required that the left-handed and right-handed phase units correspond to the pixel column LED lamp beads 2, which is difficult to achieve and the investment cost is relatively high. In the related art, to solve this problem, generally, the coating process or the laminating process of the retardation film is improved. However, since the retardation film is generally a liquid crystal polymer or a resin material, the research and development of liquid crystal polymers is difficult, and at the same time, the alignment of liquid crystal polymers is difficult. The liquid crystal alignment equipment mainly relies on foreign countries. For different pitch LED lamp beads 2, different pitch films need to be developed to correspond. For resin materials, the difficulty of staggered lamination of the films is relatively high, and at the same time, it is easy to break when the film material is cut into thinner strips, resulting in a relatively high difficulty in improving the retardation film.

[0054] The technical concept of the present application is that during the manufacturing process of the LED lamp beads 2, when multiple LED lamp beads 2 are not cut from the lamp bead bracket into individual LED lamp beads 2, a circular polarizer with a retardation film of the same rotation direction is laminated onto the surface of the LED lamp bead array, and a circular polarizer with a retardation film of the other rotation direction is laminated onto the surface of another group of LED lamp beads 2. After the LED lamp bead array is cut and separated, a circular polarizer is pre-set on the surface of each LED lamp bead 2, and then the LED lamp beads 2 with left-handed and right-handed circular polarizers are alternately welded in rows or columns onto the PCB. Compared with the prior art, the present application provides a brand-new encapsulation idea for the display, with a lower investment cost, reduced dependence on the manufacturing precision of the circular polarizer, effectively avoiding the above difficulties, making mass production easier, and being suitable for large-scale promotion.

[0055] As Figure 1-2 shown, an embodiment provided by the present application, a 3D-LED display encapsulation process includes:

[0056] S100, Fix the LED lamp beads 2 onto the substrate, wire bond them, encapsulate them with glue, and then bake them to form an LED lamp bead array disposed on a bracket. Among them, die bonding is to fix the expanded LED wafers on the substrate for subsequent soldering and encapsulation. Wire bonding is to connect the electrodes of the LED lamp beads 2 to the substrate to complete the conduction of current. Encapsulating with glue is to protect the LED lamp beads 2 from external interference. After encapsulating with glue, baking is carried out to ensure the curing of the glue and the stability of the lamp beads. The LED lamp bead array is fixed on the lamp bead bracket. In some embodiments, the lamp bead bracket is of a rectangular structure, and several LED lamp beads 2 are arrayed and fixed on each lamp bead bracket. In the prior art, the LED lamp beads 2 on the lamp bead bracket are cut and separated to form several LED lamp beads 2, and in this application, it enters step S200.

[0057] S200, Mount circular polarizers with different optical rotation directions on at least two groups of LED lamp bead arrays disposed on brackets respectively, where the optical rotation direction of a single circular polarizer is the same. For example, it includes LED lamp bead array one and LED lamp bead array two. A left-handed circular polarizer is mounted on the surface of LED lamp bead array one, and a right-handed circular polarizer is mounted on the surface of LED lamp bead array two. It should be noted that in some other realizable embodiments, there are more groups of LED lamp bead arrays, and different groups of LED lamp bead arrays are synchronously produced in different production lines to improve production efficiency.

[0058] S300, Separate the LED lamp bead array after attaching the circular polarizer to form several independent LED lamp beads 2, where each LED lamp bead 2 has a left-handed or right-handed optical rotation direction. Cut the LED lamp bead array attached with the circular polarizer to separate each LED lamp bead 2 from the lamp bead bracket to become an independent LED lamp bead 2, so as to facilitate the subsequent use of the SMT process to mount the independent LED lamp beads 2 on the surface of the PCB board 1. Among them, the SMT process (Surface Mount Technology) refers to directly mounting tiny electronic components or display modules on the surface of the substrate of the display screen to achieve a high-density, high-precision, and efficient manufacturing process.

[0059] S400, Mount the LED lamp beads 2 on the PCB board 1, arrange several LED lamp beads 2 with the same optical rotation direction in rows or columns, and alternately solder the single row or column of LED lamp beads 2 on the surface of the PCB board 1 until the surface mounting process of the display screen is completed. It can achieve the effect of 3D display, and at the same time, it can effectively avoid the problems of high precision requirements for the retardation film, large manufacturing difficulty, and high fitting precision and large difficulty for the polarizer corresponding to the pixel column lamp beads.

[0060] It also includes S500. After the surface mounting process of the display screen is completed, a black potting material is filled in the gaps between the LED lamp beads 2, making the entire display screen present an integrated black color, which is more comfortable and natural. After filling, a protective encapsulation is performed on the surface of the display screen. For example, a protective layer 6 is mounted on the surface of the display screen, and the protective layer 6 can be a transparent protective layer 6 or a frosted protective layer 6.

[0061] Optionally, referring to Figure 2 , the absorption axes of the linear polarizers 4 on the surfaces of the first LED lamp bead array and the second LED lamp bead array are perpendicular to each other, and the optical axes of the retardation films 5 are parallel to each other. The red arrow represents the absorption axis of the polarizer, and the green arrow represents the optical axis of the retardation film. The optical axis of the retardation film 5 can be 0 degrees or 90 degrees. In some other embodiments, the absorption axes are parallel to each other, while the optical axes of the retardation films are perpendicular to each other. It should be noted that the circular polarizer includes the linear polarizer 4 and the retardation film 5 on its surface, and the angle between the retardation film and the linear polarizer 4 is +45 degrees and -45 degrees. Specifically, as Figure 2 shown, it is the angle between the red arrow and the green arrow.

[0062] As Figure 3 shown, another embodiment provided by the present application, a 3D-LED display screen encapsulation process, different from the above embodiment, in this embodiment:

[0063] Linear polarizers 4 with perpendicular absorption axes are surface-mounted on two groups of LED lamp bead 2 arrays arranged on the bracket.

[0064] The LED lamp bead 2 arrays after fitting the linear polarizers 4 are separated to form several independent LED lamp beads 2, and several LED lamp beads 2 have two directions of absorption axes.

[0065] The several LED lamp beads 2 are surface-mounted on the PCB board 1, several LED lamp beads 2 with the same absorption axis direction are arranged in rows or columns, and the single-row or single-column LED lamp beads 2 are alternately soldered on the surface of the PCB board 1 until the surface mounting of the LED lamp beads 2 is completed;

[0066] The whole retardation film 5 is surface-mounted on the surface of the above-mentioned LED lamp bead 2 array.

[0067] As Figure 4 shown, another embodiment provided by the present application, a 3D-LED display screen encapsulation process, different from the above embodiment, in this embodiment:

[0068] Two linear polarizers 4 with perpendicular absorption axes are cut into several sub-linear polarizers 4 with the same area as a single LED lamp bead 2;

[0069] Several LED lamp beads 2 are surface-mounted on the PCB board 1;

[0070] The sub-linear polarizers 4 of different absorption axis pixel columns are alternately surface-mounted on the surface of the LED lamp beads 2;

[0071] The whole retardation film 5 is surface-mounted on the surface of the above-mentioned LED lamp bead array 2.

[0072] Another embodiment provided by the present application is a 3D-LED display screen packaging process. Different from the above embodiment, in this embodiment:

[0073] Two circular polarizers with different rotation directions are cut into several sub-circular polarizers with the same area as a single LED lamp bead 2;

[0074] Several LED lamp beads 2 are surface-mounted on the PCB board 1;

[0075] The sub-circular polarizers of different rotation direction pixel columns are alternately surface-mounted on the surface of the LED lamp beads 2 until all the LED lamp beads 2 are surface-mounted.

[0076] As Figures 5-7 shown, an embodiment provided by the present application is a display screen applying the 3D-LED display screen packaging process, including:

[0077] A display screen substrate, and the display screen substrate is the PCB board 1.

[0078] An array of several LED lamp beads is arranged on the surface of the display screen substrate, and an independent circular polarizer is attached to the surface of each LED lamp bead 2. Specifically, an independent circular polarizer is mounted on the surface of each LED lamp bead 2, and the size of the circular polarizer is equal to the surface area of the LED lamp bead 2.

[0079] Among them, the circular polarizers of each pixel column / row are all in the same rotation direction, and the rotation directions of the circular polarizers of adjacent pixel columns / rows are opposite. It should be noted that a pixel column or a pixel row refers to the row or column where a single LED lamp bead 2 is located in the display screen. If the rotation direction of the circular polarizer of a certain row of pixel columns / rows is left-handed, the rotation direction of the adjacent pixel row / column is right-handed, thus forming an alternately arranged left-handed and right-handed array form.

[0080] As Figures 5-6 shown, for the structure of the circular polarizer, from bottom to top, it includes:

[0081] An adhesive layer 3, and the adhesive layer 3 is used to mount the circular polarizer on the surface of the LED lamp bead 2, and the thickness of the adhesive layer 3 is 10-250 μm.

[0082] A linear polarizer 4, and the thickness of the linear polarizer 4 is 70-170 μm. In some other embodiments, the thickness of the linear polarizer 4 can be 50, 200, 220, and 240 μm.

[0083] A retardation film, which is made of liquid crystal polymer or resin material. When the retardation film is made of liquid crystal polymer, its thickness is 2 μm. When the retardation film is made of resin material, its thickness is 20 - 70 μm. Common liquid crystal polymer materials include nematic, cholesteric, smectic, and ferroelectric liquid crystals. The materials of the commonly used retardation films of resin materials are PC polycarbonate, COP cycloolefin, PMMA acrylic, and PET.

[0084] As Figure 7 shown, in the embodiment provided by the present application, different from the above display screen, the structure of the circular polarizer from bottom to top sequentially includes:

[0085] Adhesive layer 3;

[0086] Retardation film 5;

[0087] Linear polarizer 4;

[0088] Retardation film 5.

[0089] By adding a retardation film 5 below the linear polarizer 4, the white dots of the LED display screen can be covered, making the LED display screen entirely pure black, more comfortable and natural.

[0090] As Figure 8 shown, in the embodiment provided by the present application, different from the above display screen, in the corresponding Figures 3-4 embodiment, the structure of the circular polarizer from bottom to top sequentially includes:

[0091] Adhesive layer 3;

[0092] The whole retardation film 5;

[0093] Linear polarizer 4.

[0094] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A 3D-LED display screen packaging process, characterized in that: include: S100, performing die bonding, wire bonding, sealing and baking on the LED lamp bead material to form an LED lamp bead array arranged on the bracket; S200, attaching circular polarizers with different optical rotation directions to at least two groups of LED lamp bead arrays disposed on a bracket, wherein the optical rotation directions of the single circular polarizers are the same; S300, separating the LED lamp bead array after the circular polarizer is attached to form a plurality of independent LED lamp beads, wherein each LED lamp bead has a left-handed or right-handed optical rotation direction; S400, LED lamp beads are surface mounted to the PCB board, several LED lamp beads with the same optical rotation direction are arranged into rows or columns, and the LED lamp beads in a single row or column are alternately soldered to the surface of the PCB board until the surface mounting process of the display screen is completed.

2. The 3D-LED display screen packaging process according to claim 1, characterized in that: In step S200, a first LED lamp bead array and a second LED lamp bead array are included. A first circular polarizer is attached to the surface of the first LED lamp bead array, and a second circular polarizer is attached to the surface of the second LED lamp bead array.

3. The 3D-LED display screen packaging process according to claim 2, characterized in that: When the absorption axis of the circular polarizer 1 is perpendicular to the absorption axis of the circular polarizer 2, the optical axes of the phase difference films of the circular polarizer 1 and the circular polarizer 2 are parallel; When the absorption axis of the circular polarizer 1 is parallel to the absorption axis of the circular polarizer 2, the optical axes of the phase difference films of the circular polarizer 1 and the circular polarizer 2 are perpendicular.

4. The 3D-LED display screen packaging process according to claim 3, characterized in that: The angle of the absorption axis is 0 degrees or 90 degrees; and +45 degrees or -45 degrees.

5. A 3D-LED display screen packaging process, characterized in that: include: S100, performing die bonding, wire bonding, sealing and baking on the LED lamp bead material to form an LED lamp bead array arranged on the bracket; S200, attaching linear polarizers whose absorption axes are perpendicular to each other to the surfaces of at least two groups of LED lamp bead arrays arranged on the bracket; S300, separating the LED lamp bead array after the circular polarizer is attached to form a plurality of independent LED lamp beads, wherein the plurality of LED lamp beads have absorption axes in two directions, and the two directions are perpendicular to each other; S400, mounting a plurality of LED lamp beads on a PCB, arranging a plurality of LED lamp beads in the same absorption axis direction into rows or columns, and alternately soldering the LED lamp beads in a single row or column on the surface of the PCB until the mounting of the LED lamp beads is completed; S500, attaching the entire phase difference film to the surface of the LED lamp bead array, wherein the entire phase difference film has an optical axis in the same direction.

6. A 3D-LED display screen packaging process, characterized in that: include: S100, cutting at least two linear polarizers whose absorption axes are perpendicular to each other into a plurality of sub-linear polarizers having the same area as a single LED lamp bead; S200, mount several LED lamp beads on the PCB board; S300, alternately attaching sub-line polarizers of different absorption axis pixel columns to the surface of the LED lamp bead; S400, attaching the entire phase difference film to the surface of the LED lamp bead array, wherein the entire phase difference film has an optical axis in the same direction.

7. A 3D-LED display screen packaging process, characterized in that: include: S100, cutting at least two circular polarizers with different optical rotation directions into a plurality of sub-circular polarizers having the same area as a single LED lamp bead; S200, mount several LED lamp beads on the PCB board; S300, alternately surface-mounting the sub-circular polarizers of the pixel columns with different optical rotation directions onto the surface of the LED lamp beads until the surface mounting of all the LED lamp beads is completed.

8. A display screen using the 3D-LED display screen packaging process according to any one of claims 1 to 7, characterized in that: include: Display screen substrate; An array of several LED lamp beads is arranged on the surface of the display screen substrate, and each of the LED lamp beads is covered with a mutually independent circular polarizer; The circular polarizers in each pixel column / row have the same optical rotation direction, and the circular polarizers in adjacent pixel columns / rows have opposite optical rotation directions.

9. The display screen according to claim 8, characterized in that: The circular polarizer attached to the surface of each LED lamp bead includes the following from bottom to top: Adhesive layer; Linear polarizer; Phase difference film.

10. The display screen according to claim 9, characterized in that: The phase difference film is made by coating liquid crystal or surface-mounted resin material.

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