CN216647039U

CN216647039U - Direct type liquid crystal television backlight module

Info

Publication number: CN216647039U
Application number: CN202220293043.3U
Authority: CN
Inventors: 孙鸿浩; 廖炎; 杨荣冲
Original assignee: Sichuan Changhong Electric Co Ltd
Current assignee: Sichuan Changhong Electric Co Ltd
Priority date: 2022-02-14
Filing date: 2022-02-14
Publication date: 2022-05-31
Anticipated expiration: 2032-02-14

Abstract

The utility model discloses a direct type liquid crystal television backlight module which comprises a back plate and a reflector plate, wherein a first double-sided adhesive layer is arranged on the back plate, a PCB aluminum substrate is arranged on the first double-sided adhesive layer, lamp beads are arranged on the PCB aluminum substrate, a double-sided adhesive tape layer is arranged on the PCB aluminum substrate on one side of each lamp bead, and the reflector plate is adhered to the double-sided adhesive tape layer. According to the utility model, glue or adhesive tape is not needed to be used for adhering the back plate, the upper surface and the lower surface of the PCB of the light bar are coated with the glue, the release paper on the surface of the adhesive tape is torn and then is loaded into the back plate to be adhered and fixed, then the reflector plate is assembled, and the reflector plate is pressed by a tool to be smoothly adhered, and meanwhile, the pressure maintaining effect is also provided for the light bar, so that the light bar is ensured to be smoothly adhered on the plane of the back plate.

Description

Direct type liquid crystal television backlight module

Technical Field

The utility model relates to the technical field of televisions, in particular to a direct type liquid crystal television backlight module.

Background

The direct type liquid crystal television backlight module mainly comprises a back plate, a light bar, a reflector plate, a diffusion plate bracket, a diffusion plate, a membrane and a liquid crystal display screen. The liquid crystal does not emit light, the backlight source is derived from the lamp beads on the lamp strip, the light emitted by the lamp bead chip can be regarded as a point light source, the membrane plate is used for diffusing and atomizing the point light source into an even surface light source, and finally, a complete picture is formed through the liquid crystal display. Therefore, the overall uniformity of the picture is closely related to the film plate, and the reflective sheet is the most important.

In recent years, the thinner the direct type liquid crystal television tends to be, the smaller the backlight OD becomes, and thus the requirement for the adhesion flatness of the reflective sheet is high. Traditional liquid crystal backlight module assembly need place lamp strip position department point on the backplate earlier and glue, the lamp strip is pasted in the backplate after, paste double-sided sticky tape again, roll after putting into the reflector plate and press and make the reflector plate paste in the backplate surface, because height about 1mm of lamp strip PCB board itself, form the difference in height with the backplate surface, the reflector plate pastes the back, between the lamp strip, the warpage's condition can all appear arching with the domatic handing-over department of backplate in the lamp strip big face to arouse subjective bright dark inequality. The design of the traditional scheme needs to adopt a foam rubber mat high-reflection sheet which is adhered to the same height as the PCB of the light bar, so that the material cost of the whole machine is increased, and meanwhile, the manufacturing cost is increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a direct type liquid crystal television backlight module, which solves the problem of poor subjectivity caused by arching of a reflector of the direct type liquid crystal module, optimizes the assembling steps of the backlight module and is convenient to operate. Compared with the traditional backlight assembly, the LED backlight assembly avoids the arching of the reflector plate caused by the height difference between the lamp strip and the back plate and uneven subjective light emission; on the other hand, the light bar coming material is coated with glue and the back plate and the reflector plate are adhered at the same time, so that the production cost is saved; the lamp strip pressurize and the reflector plate press two-step operation unite two into one, improve production efficiency.

The utility model realizes the purpose through the following technical scheme:

the direct type liquid crystal display television backlight module comprises a back plate and a reflector plate, wherein a first double-sided adhesive layer is arranged on the back plate, a PCB (printed circuit board) aluminum substrate is arranged on the first double-sided adhesive layer, lamp beads are arranged on the PCB aluminum substrate, a double-sided adhesive tape layer is arranged on the PCB aluminum substrate on one side of the lamp beads, and the reflector plate is adhered to the double-sided adhesive tape layer.

The further scheme is that the double-sided adhesive tape layer is covered with release paper, the length of the release paper is the same as that of the double-sided adhesive tape layer, and the width of the release paper is 5mm larger than that of the double-sided adhesive tape layer.

The further proposal is that the first double-sided adhesive layer has the size of 40-60mm in length, 25-29mm in width and 0.05-0.2mm in thickness; the length of the double-sided adhesive tape layer is fixed to be 10 mm.

Further, the double-sided adhesive tape layer or the first double-sided adhesive tape layer is made of a PET substrate double-sided adhesive tape, including 3M93015LE or TESA 4982.

The utility model has the beneficial effects that:

the problem that the reflecting sheet arches due to the height difference between the light bar and the back plate, so that bad subjectivity is caused, is avoided; in the manufacturing cost, the scheme saves the manufacturing cost and the operation process of adhesive tape sticking and double-sided adhesive tape, and can improve the production efficiency of module assembly.

According to the utility model, glue or adhesive tape is not needed to be used for adhering the back plate, the upper surface and the lower surface of the PCB of the light bar are coated with the glue, the release paper on the surface of the adhesive tape is torn and then is loaded into the back plate to be adhered and fixed, then the reflector plate is assembled, and the reflector plate is pressed by a tool to be smoothly adhered, and meanwhile, the pressure maintaining effect is also provided for the light bar, so that the light bar is ensured to be smoothly adhered on the plane of the back plate.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the embodiments or the drawings needed to be practical in the prior art description, and obviously, the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a simplified assembly diagram of a conventional direct type liquid crystal module backlight assembly, as shown in fig. 1, a tv back plate (11), glue (12), a light bar (13), a double-sided tape (14), a reflective sheet (15), and a film plate (16);

FIG. 2 is a schematic diagram of the PCB coating of the light bar of the present invention. As shown in fig. 2, a lamp bead (7), a PCB aluminum substrate (8), a double-sided tape (9), and release paper (10);

fig. 3 is a conventional backlight assembly pasting diagram (front view). As shown in FIG. 3, the TV back plate (11), the lamp strip (13), the double-sided tape (14)

Fig. 4 is a schematic (front view) of the novel backlight assembly of the present invention. As shown in fig. 4, a tv back panel (1), a light bar (3), and a double-sided tape layer (9);

fig. 5 is a simplified schematic diagram of a reflector pressing tool.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

In any embodiment, as shown in fig. 1, a direct type lcd tv backlight module according to the present invention;

fig. 1 is an assembly diagram of a conventional direct type liquid crystal module backlight assembly, in which a back plate, glue, a light bar, a double-sided tape, a reflective sheet, and a film plate are sequentially assembled. Wherein traditional backlight unit pastes the sketch as in fig. 3, places lamp strip department at first on the backplate and covers glue, and after the lamp strip assembles into backplate light cavity, the pressurize makes lamp strip PCB board and backplate attach completely at first, ensures the lamp pearl heat dissipation. And then adhering a double-sided adhesive tape, tearing off the release paper, assembling the reflector plate, and finally rolling and pressing the reflector plate to be attached to the back plate.

The structure of the lamp strip is shown in fig. 2, the upper surface and the lower surface of a PCB (printed circuit board) of incoming lamp strip materials are simultaneously pasted with glue, the PCB aluminum substrate is provided with the lamp beads, the PCB aluminum substrate on one side of the lamp beads is provided with double-sided adhesive tapes, specifically, the upper surface and the lower surface of the PCB and one end side surface are pasted with the double-sided adhesive tapes with release paper on one side, and meanwhile, a section of release paper without adhesive tapes is added, so that the tearing operation is convenient.

The specific backlight assembly mode of the utility model is shown in a schematic diagram 4, firstly, the lamp strip is torn off the release paper and is placed in the back plate to be assembled, then the reflector plate is placed in the light cavity, and the PCB board rubberizing part, namely two ends of the lamp bead, is pressed on the surface of the reflector plate through the pressing tool shown in FIG. 5. And after pressure maintaining, the film plate and the liquid crystal display screen are placed to complete the assembly of the module. According to the scheme, the reflector plate is not directly adhered to the surface of the back plate and only contacts with the surface of the light bar, and the total adhering area is smaller than that of the traditional scheme; the lamp strip supplied materials are coated with glue and are simultaneously pasted, so that the operation is simple and convenient. In order to ensure the long-term reliability of the backlight assembly, the materials coated with the glue on the surface of the PCB are screened, and the materials with strong viscosity are selected.

Fig. 5 shows that the tool is dual-purpose, and not only can the reflector plate be pressed to be firmly adhered to the PCB surface of the lamp strip, but also the pressure maintaining effect can be achieved on the lamp strip, and the lamp strip can be guaranteed to be flatly adhered to the surface of the back plate. The assembly process is reduced, and the manufacturing cost is saved.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims. It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the utility model is not described in any way for the possible combinations in order to avoid unnecessary repetition. In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims

1. The direct type liquid crystal display television backlight module is characterized by comprising a back plate and a reflector plate, wherein a first double-sided adhesive layer is arranged on the back plate, a PCB (printed circuit board) aluminum substrate is arranged on the first double-sided adhesive layer, a lamp bead is arranged on the PCB aluminum substrate, a double-sided adhesive tape layer is arranged on the PCB aluminum substrate on one side of the lamp bead, and the reflector plate is adhered to the double-sided adhesive tape layer.

2. The direct type liquid crystal television backlight module according to claim 1, wherein the double-sided tape layer is covered with a release paper, the length of the release paper is the same as that of the double-sided tape layer, and the width of the release paper is 5mm larger than that of the double-sided tape layer.

3. The direct type liquid crystal television backlight module according to claim 1, wherein the first double-sided adhesive layer has a dimension of 40-60mm in length, 25-29mm in width and 0.05-0.2mm in thickness; the length of the double-sided adhesive tape layer is fixed to be 10 mm.

4. The direct type lcd tv backlight module according to claim 1, wherein the double-sided tape layer or the first double-sided tape layer is a PET-based double-sided tape, including 3M93015LE or TESA 4982.