WO2019019833A1

WO2019019833A1 - Backlight module, electronic device, display apparatus and manufacturing method therefor

Info

Publication number: WO2019019833A1
Application number: PCT/CN2018/091453
Authority: WO
Inventors: 欧阳志斌
Original assignee: Oppo广东移动通信有限公司
Priority date: 2017-07-28
Filing date: 2018-06-15
Publication date: 2019-01-31
Also published as: CN107340630A

Abstract

A backlight module (100), an electronic device, a display apparatus and a manufacturing method therefor. The backlight module (100) comprises: a frame body (110); and a release film assembly (150), wherein the release film assembly (150) is arranged at the top of the frame body (110), and the release film assembly (150) constitutes a closed space with the frame body (110).

Description

Backlight module, electronic device, display device and preparation method thereof

Technical field

The present application relates to the field of display technologies, and in particular, to a backlight module, an electronic device, a display device, and a method of fabricating the same.

Background technique

The liquid crystal display device is widely used in display devices of electronic devices due to its small size, low power consumption, no radiation, and the like, for example, a mobile phone screen, a computer screen, and the like. The liquid crystal itself does not emit light. It provides a light source by means of a backlight module located behind the liquid crystal display panel (LCD), and the image displayed is the result of its modulation of light. The quality of the backlight module has an important influence on the display effect of the display device. For example, the backlight brightness and the uniformity of the backlight that the backlight module can provide will affect the final display effect of the display device.

Therefore, research on backlight modules, electronic devices, display devices, and preparation methods thereof has yet to be improved.

Summary of the invention

In one aspect of the present application, the present application proposes a backlight module. The backlight module comprises: a frame; a release film assembly, the release film assembly is disposed at a top of the frame, and the release film assembly and the frame form a closed space. Thereby, the backlight module can effectively block the entry of dust.

In another aspect of the present application, the present application provides a display device. According to an embodiment of the present application, the display device includes: a backlight assembly formed by the backlight module described above; and a display a panel, the display panel is disposed on the backlight module. Therefore, the display device has all the features and advantages of the backlight module described above, and details are not described herein again.

In yet another aspect of the present application, the present application is directed to an electronic device including the display device described above, in accordance with an embodiment of the present application.

In still another aspect of the present application, the present application provides a method for preparing the display device described above. According to an embodiment of the present application, the method includes: providing a display panel; and pairing the backlight module with the display panel And removing the release film group in the backlight module and assembling with the display panel to obtain the display device. Thereby, it is possible to effectively prevent the backlight module from entering foreign matter such as dust before being assembled with the display panel, and it is possible to improve the performance of the display device prepared by the method.

DRAWINGS

1 is a cross-sectional structural view of a backlight module according to an embodiment of the present application;

2 is a schematic structural view of a frame of a backlight module according to an embodiment of the present application;

3 is a cross-sectional structural view showing a backlight module according to still another embodiment of the present application;

4 is a schematic view showing the structure of a release film set according to an embodiment of the present application;

FIG. 5 is a schematic view showing the structure of a release film set according to another embodiment of the present application; FIG.

6 is a partial cross-sectional structural view of a backlight module according to an embodiment of the present application;

FIG. 7 is a partial cross-sectional structural view showing a backlight module according to still another embodiment of the present application;

FIG. 8 is a partial structural diagram of a backlight module of the prior art;

9 shows a flow chart of a method of preparing a display device in accordance with one embodiment of the present application.

Description of the reference signs:

100: backlight module; 110: frame; 10: bottom surface; 20: frame; 21: frame arranged along the first direction; 22: frame arranged in the second direction; 120: bottom reflection sheet; 130: light guide plate; 140: optical film; 70: upper antireflection film; 80: lower antireflection film; 90: diffusion film; 150: release film assembly; 30: release film; 40: adhesive layer; 50: second release film; 60: shading gel; 160: plastic; 200: display panel; 300: backlight assembly; 1000: display device.

Detailed ways

The embodiments of the present application are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are intended to be illustrative only, and are not to be construed as limiting.

In one aspect of the present application, the present application provides a backlight module 100. According to an embodiment of the present application, referring to FIG. 1 , the backlight module 100 includes a frame 110 and a release film assembly 150 . The release film assembly 150 is disposed at the top of the frame 110 and constitutes a closed space with the frame 110. Thereby, the backlight module 100 can effectively block the entry of foreign matter such as dust.

According to an embodiment of the present application, the backlight module 100 further includes: a bottom reflective sheet 120, a light guide plate 130, and an optical film 140. According to the embodiment of the present application, the bottom reflective sheet 120 is disposed at the bottom of the frame 110, the light guide plate 130 is disposed at a side of the bottom reflective sheet 120 away from the bottom of the frame 110, and the optical film 140 is disposed at the light guide plate 130 away from the bottom reflective sheet. One side of 120.

According to the embodiment of the present application, referring to FIG. 2 , the frame 110 of the backlight module 100 includes a quadrilateral bottom surface 10 and four side frames 20 . The side frame 20 is disposed on the edge of the quadrilateral bottom surface 10, and the side frame 20 includes two side frames 21 disposed along the first direction and two side frames 22 disposed along the second direction, as shown in FIG. The A direction shown) and the second direction (the B direction as shown in FIG. 2) are perpendicular to each other. Therefore, the frame 110 can effectively support and protect the backlight module 100. It can be understood by those skilled in the art that in the present application, the "first direction" and the "second direction" are only for distinguishing the direction in which the side frames 22 are disposed, and the first direction and the second direction are interchangeable.

For the sake of easy understanding, the principle of preventing the entry of foreign matter such as dust in the backlight module 100 according to the embodiment of the present application is briefly described below:

The inventors have found that the current display device generally has the problem of low reliability after assembly of the backlight module and the liquid crystal display panel (LCD). For example, after the reliability test, the display device is prone to problems such as white clouds and white spots. The inventors have conducted intensive research and a large number of experiments and found that this is mainly because in the liquid crystal display device, the LCD and the backlight module are two separate parts, which need to be separately fabricated and then assembled. During the manufacturing and assembly process, ensure that the LCD and backlight modules are clean and prevent dust from entering. Since the liquid crystal molecules are encapsulated in the LCD, the packaging reliability of the LCD is high, and it is difficult to enter foreign matter such as dust before assembly. The surface of the backlight module is usually provided with a peelable release film to protect the optical film in the backlight module from contamination, but the sealing property of the release film needs to be improved, thereby causing the backlight module, often in the process of transportation assembly and the like. In the meantime, it is contaminated by foreign matter such as dust, which in turn causes a decrease in the reliability of the display device. Therefore, it is an important technical issue to ensure that the backlight module is cleaned during manufacturing, transportation and assembly. As mentioned above, the quality of the backlight module has an important influence on the display effect of the display device. Therefore, dust and foreign matter entering the backlight module may cause problems such as a decrease in the contrast of the liquid crystal display, a decrease in the brightness of the screen, and even blurring of the image display. The backlight module proposed in the present application can effectively block the entry of foreign matter such as dust, and thus the above problem can be largely solved.

According to an embodiment of the present application, those skilled in the art can understand that current display screens, particularly display screens for electronic devices such as mobile phones, generally have narrow borders along the left and right sides of the mobile phone (longitudinal direction of the screen). The upper and lower borders (ie, the short side of the screen) have thicker borders due to the need to set the front camera and function keys. In addition, the traces of the array substrate and the like in the display screen are also concentrated in the direction of the upper and lower frames of the display screen. Therefore, referring to FIG. 7 , the distance between the side frame 21 of the backlight module in the first direction (ie, the direction A in FIG. 2 ) and the structure of the light guide plate 130 is generally wider, so that the plastic can be molded on the side frame 21 in the first direction. 160. The light-shielding glue 60 is adhered to the plastic 160 to seal the release film 30 from the side frame 21 in the first direction. However, the distance between the side frame 22 in the second direction (ie, the B direction in FIG. 2) and the structure of the light guide plate 130 is generally narrow. Referring to FIG. 8, the current backlight module has a side frame 22 along the second direction. The plastic 160 cannot be produced by injection molding, and thus the shading adhesive 60 cannot be attached to the plastic 160. Since the side frame 22 in the second direction does not have the light shielding glue 60, the release film 30 and the frame 110 are open, and may be assembled, detected, transported, and assembled before the LCD and the backlight module are assembled. Foreign matter such as dust may be entered, resulting in bright spots, bright lines, white clusters, etc. in the display device, which degrades the performance of the display device. According to the embodiment of the present application, referring to FIG. 6, the present application uses a release film assembly 150 instead of a single release film, so that the separation between the release film assembly 150 and the frame 110 can be realized without adding the plastic 160. Sealed to prevent dust from entering the interior of the backlight module.

The specific structure of the release film assembly 150 will be described in detail below according to a specific embodiment of the present application:

According to an embodiment of the present application, referring to FIG. 3, the release film assembly 150 of the backlight module 100 includes: a release film 30 and a glue layer 40. The glue layer 40 is disposed on the release film 30, and the glue layer 40 and the frame Body 110 is in contact. Thereby, the release film assembly 150 and the side frame 20 of the frame body 110 can be effectively bonded by the adhesive layer 40 and form a sealed space, which can effectively block the entry of foreign matter such as dust. Since the adhesive layer 40 is disposed on the side of the release film 30 close to the optical film 140, it is not necessary to additionally form a plastic structure for providing the light-shielding glue at the side wall of the frame 110. Thereby, the sealing between the release film and the frame 110 can be achieved also in the left and right directions (i.e., the B direction shown in FIG. 2) in which the space is narrower. According to the embodiment of the present application, the specific material of the adhesive layer 40 is not particularly limited, and those skilled in the art can select according to actual needs. For example, at least one of an optical glue and a double-sided tape. According to a specific embodiment of the present application, the adhesive layer 40 may be formed of one of an optical adhesive and a double-sided tape, or may be formed of an optical adhesive and a double-sided tape. Thereby, the source of the adhesive layer 40 is rich and easy to obtain, and the production cost of the product can be further reduced.

According to the embodiment of the present application, referring to FIG. 3 , the release film assembly 150 of the backlight module 100 further includes a second release film 50 disposed on the glue layer 40 away from the release film 30 . The side, and the second release film 50 is disposed in a sealed space formed by the glue layer 40 and the side frame 20. According to an embodiment of the present application, the cross-sectional area of the second release film 50 is not less than the surface area of the cross section of the optical film 140. Therefore, the second release film 50 can effectively separate the adhesive layer 40 and the optical film 140. Therefore, when the backlight module is assembled with the LCD, the release film assembly 150 can be conveniently peeled off without using the release film assembly 150. It is feared that the glue layer 40 will stick to the optical film 140. Thereby, it is possible to prevent the adhesive layer 40 from remaining on the optical film 140 and affect the performance of the optical film 140. According to an embodiment of the present application, the thickness of the second release film 50 may be no greater than a difference in height between the top of the optical film 140 and the top of the frame 110. Therefore, the second release film 50 can improve the surface flatness of the backlight module, and is advantageous for transportation and storage.

According to an embodiment of the present application, referring to FIG. 4 and FIG. 5, the release film assembly 150 and the side frame 21 disposed in the first direction may be sealed by the light shielding glue 60, and the side of the release film assembly 150 and the second direction are disposed. The borders 22 can be sealed by a glue layer 40. That is, the glue layer 40 covers a part of the surface area of the release film 30. Therefore, the release film 30 and the four side frames 20 of the frame 110 can form an effective seal, thereby effectively preventing foreign matter such as dust during assembly, detection, transportation, and assembly of the LCD module 100. The entry of the backlight module 100 greatly improves the performance of the backlight module 100.

Alternatively, according to other embodiments of the present application, referring to FIG. 6 , the release film assembly 150 of the backlight module 100 and the four side frames 20 may also be sealed by the adhesive layer 40 , thereby the release film assembly 150 . The side frame 20 can be effectively bonded to prevent foreign matter such as dust from entering the release film package 100.

According to the embodiment of the present application, in order to further improve the performance of the backlight module 100, referring to FIG. 3, the optical film 140 of the backlight module 100 may further include: an upper anti-reflection film 70, a lower anti-reflection film 80, and diffusion. At least one of the films 90. According to a specific embodiment of the present application, the optical film 140 may further include one of an upper anti-reflection film 70, a lower anti-reflection film 80, and a diffusion film 90, such as an anti-reflection film 70, or an upper anti-reflection film 70, and an anti-reflection film. Two of the film 80 and the diffusion film 90, such as the anti-reflection film 70 and the lower anti-reflection film 80, or the upper anti-reflection film 70, the lower anti-reflection film 80, and the diffusion film 90. According to an embodiment of the present application, the diffusion film 90 is disposed at the bottom of the optical film 140, and the upper anti-reflection film 70 and the lower anti-reflection film 80 are disposed on the side of the diffusion film 90 away from the bottom of the optical film 140. The diffusion film 90 can correct the angle of the backlight, so that the light source diffuses through the diffusion film 90 to become a secondary light source with larger area, better uniformity, and stable chromaticity. The upper anti-reflection film 70 and the lower anti-reflection film 80 can change the polarization of the light in each direction to be perpendicular to the direction of propagation, so that the surface of the vertical light guide plate of the human eye looks brightest. Thereby, the upper anti-reflection film 70, the lower anti-reflection film 80, and the diffusion film 90 can improve the performance of the backlight module 100.

In another aspect of the present application, the present application proposes a display device. According to an embodiment of the present application, the display device includes: a backlight assembly and a display panel, and the backlight assembly is formed by the backlight module described above, and the display panel is disposed on the backlight assembly. Therefore, the display device has all the features and advantages of the backlight module described above, and details are not described herein again. Those skilled in the art can understand that the backlight module described above is a backlight module of the display device according to the embodiment of the present application after the release film assembly is removed.

In still another aspect of the present application, the present application proposes an electronic device (mobile terminal) including the display device described above. Therefore, the electronic device has all the features and advantages of the display device described above, and details are not described herein again.

According to an embodiment of the present application, the above electronic device may be any one of various types of computer system devices that are mobile or portable and perform wireless communication. Specifically, the electronic device may be a mobile phone or a smart phone (eg, iPhoneTM based, AndroidTM based phone), a portable gaming device (eg Nintendo DSTM, PlayStation PortableTM, Gameboy AdvanceTM, iPhoneTM), laptop Computers, PDAs, portable Internet devices, music players, and data storage devices, other handheld devices, and such as watches, in-ear headphones, pendants, headphones, etc., electronic devices can also be other wearable devices (eg, such as electronics Glasses, electronic clothes, electronic bracelets, electronic necklaces, electronic tattoos or smart watch headsets (HMD)).

According to an embodiment of the present application, the electronic device may also be any one of a plurality of electronic devices including, but not limited to, a cellular phone, a smart phone, other wireless communication devices, a personal digital assistant, an audio player, other media. Players, music recorders, video recorders, cameras, other media recorders, radios, medical equipment, vehicle transport instruments, calculators, programmable remote controls, pagers, laptops, desktop computers, printers, netbook computers, personal digital Assistant (PDA), Portable Multimedia Player (PMP), Moving Picture Experts Group (MPEG-1 or MPEG-2) Audio Layer 3 (MP3) player, portable medical device and digital camera and combinations thereof.

In accordance with embodiments of the present application, in some cases, an electronic device can perform a variety of functions (e.g., playing music, displaying video, storing pictures, and receiving and transmitting telephone calls). If desired, the electronic device can be a portable device such as a cellular telephone, media player, other handheld device, wristwatch device, pendant device, earpiece device, or other compact portable device.

In yet another aspect of the present application, the present application proposes a method of making a display device. Referring to (a) of FIG. 9, the method includes: providing a display panel 200 and aligning the backlight module 100 with the display panel 200. Subsequently, the release film assembly 150 in the backlight module 100 is removed and assembled with the display panel 200 (refer to (b) in FIG. 9) to obtain the display device 1000. Thereby, it is possible to effectively prevent the backlight unit 300 from entering foreign matter such as dust before being assembled with the display panel 200, and it is possible to improve the performance of the display device 1000 prepared by the method.

In the description of the present specification, the description of the terms "one embodiment", "another embodiment" or the like means that the specific features, structures, materials or characteristics described in connection with the embodiments are included in at least one embodiment of the present invention. . In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, various embodiments or examples described in the specification and features of various embodiments or examples may be combined and combined without departing from the scope of the invention. In addition, it should be noted that in the present specification, the terms "first" and "second" are used for descriptive purposes only, and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.

Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to variations, modifications, substitutions and variations.

Claims

A backlight module comprising:

framework;

A release film assembly, the release film assembly is disposed at a top of the frame, and the release film assembly and the frame constitute a closed space.
The backlight module of claim 1 further comprising:

a bottom reflective sheet, the bottom reflective sheet being disposed at a bottom of the frame;

a light guide plate disposed on a side of the bottom reflection sheet away from a bottom of the frame body;

An optical film disposed on a side of the light guide plate away from the bottom reflective sheet.
The backlight module of claim 1 , wherein the frame comprises a quadrilateral bottom surface and four side frames, and the side frames are disposed on an edge of the quadrilateral bottom surface.

among them,

The four side frames include two side frames disposed along the first direction, and two side frames disposed along the second direction, the first direction being perpendicular to the second direction.
The backlight module according to claim 3, wherein the release film assembly and the side frame of the frame constitute the sealed space.
The backlight module of claim 1, wherein the release film assembly comprises:

Release film

a glue layer, the glue layer is disposed on the release film,

Wherein the glue layer is in contact with the frame.
The backlight module of claim 5, wherein the adhesive layer is formed of at least one of an optical adhesive and a double-sided adhesive.
The backlight module according to claim 4 or 5, wherein the release film assembly and the four side frames are sealed by the adhesive layer.
The backlight module of claim 5, wherein the adhesive layer covers a portion of a surface area of the release film.
The backlight module according to any one of claims 4-8, wherein the release film assembly and the side frame disposed along the first direction are sealed by a light shielding glue;

The release film assembly and the side frame disposed along the second direction are sealed by the glue layer.
The backlight module of claim 5, wherein the release film assembly further comprises:

a second release film disposed on a side of the glue layer away from the release film, the second release film being disposed in the sealed space.
The backlight module of claim 10, wherein the second release film has a cross-sectional area that is not less than a surface area of the optical film cross section.
The backlight module of claim 10, wherein the thickness of the second release film is not greater than a height difference between a top of the optical film and a top of the frame.
The backlight module of claim 1, wherein the optical film comprises at least one of the following structures: a diffusion film and an anti-reflection film.
The backlight module of claim 1, wherein the optical film comprises at least one of the following structures: an upper anti-reflection film, a lower anti-reflection film, and a diffusion film.
The backlight module of claim 14, wherein the diffusion film is disposed at a bottom of the optical film.
The backlight module of claim 14, wherein the upper anti-reflection film is disposed on a side of the diffusion film away from the bottom of the optical film.
A display device comprising:

A backlight assembly formed by the backlight module of any one of claims 1-16.
The display device of claim 17, further comprising:

a display panel, the display panel being disposed on the backlight assembly.
An electronic device comprising the display device of claim 17 or 18.
A method of preparing the display device of claim 17 or 18, comprising:

Providing a display panel;

The backlight module is aligned with the display panel, and the release film group in the backlight module is removed and assembled with the display panel to obtain the display device.