WO2016183902A1

WO2016183902A1 - Backlight module and liquid crystal display device

Info

Publication number: WO2016183902A1
Application number: PCT/CN2015/082273
Authority: WO
Inventors: 刘中杰; 郭庆; 张彦学
Original assignee: 武汉华星光电技术有限公司
Priority date: 2015-05-19
Filing date: 2015-06-25
Publication date: 2016-11-24
Also published as: CN104808390A; CN104808390B

Abstract

A backlight module comprises a light guide film (27) and saves a reflective sheet, so that the backlight module has a relative small thickness, and an accommodation space (28) is formed between the light guide film (27) and an LED lamp (24), and as a result, when a liquid crystal display device installed with the backlight module is used for preparing a mobile phone or a tablet computer, the accommodation space (28) can be designed matching the entire structure of the mobile phone or the tablet computer for placing an element, such as a circuit and a battery, thereby making the thickness of the liquid crystal display device smaller. Also provided is a liquid crystal display device.

Description

Backlight module and liquid crystal display device

Technical field

The present invention relates to the field of display technologies, and in particular, to a backlight module and a liquid crystal display device.

Background technique

Liquid crystal display (LCD) has many advantages such as thin body, power saving, no radiation, etc., and is widely used, such as mobile phones, personal digital assistants (PDAs), digital cameras, computer screens or laptops. Screen, etc.

Most of the liquid crystal display devices on the market are backlight type liquid crystal display devices, which include a backlight module, a liquid crystal panel coupled to the backlight module, and a front frame for fixing the liquid crystal panel and the backlight module.

Generally, a liquid crystal display panel consists of a color filter substrate (CF), a thin film transistor substrate (TFT, Thin Film Transistor), a liquid crystal (LC) sandwiched between a color filter substrate and a thin film transistor substrate, and a sealant frame ( Sealant), the working principle of the liquid crystal panel is to place liquid crystal molecules in two parallel glass substrates. There are many vertical and horizontal small wires between the two glass substrates, and the liquid crystal molecules can be controlled to change direction by energization or not. The set of light is refracted to produce a picture.

The liquid crystal panel itself does not emit light, and the light source provided by the backlight module is required to display the image normally. The backlight module is divided into a side-in type backlight module and a direct-lit backlight module according to different incident positions of the light source. The side-lit backlight module has a backlight LED strip (Light bar) disposed on the edge of the back panel behind the liquid crystal panel, and the light emitted by the LED strip is from the light guide surface of the light guide plate (LGP). The light guide plate enters the light guide plate, is reflected and diffused, and is emitted from the light exit surface of the light guide plate, and then is supplied to the liquid crystal panel through the optical film group to form a surface light source. In the direct type backlight module, a light source such as a cathode fluorescent lamp (CCFL) or a light emitting diode (LED) is disposed behind the liquid crystal panel, and a surface light source is directly formed and supplied to the liquid crystal panel.

With the rapid development of thin products of mobile communication products and tablet products, users are increasingly pursuing ultra-thin experiences. The thinnest mobile phone on the market is about 6.1mm. The thickness of the liquid crystal display device lies in the thickness of the liquid crystal panel and the thickness of the backlight module. Currently, the backlight module has a three-layer diaphragm (upper and lower prism sheets, a diffusion sheet), and the reflection sheet mostly uses a silver reflection sheet and has a low end. The model uses a white reflector. Most of the light guide plates are used with LED models, such as LED3806 with 0.4mm light guide plate. In this way, the thickness of the backlight module is determined by these components, as shown in Figure 1. The liquid crystal display device includes a backlight module 200 and a liquid crystal panel 100 disposed on the backlight module 200, wherein the liquid crystal panel 100 includes a TFT substrate. a lower polarizer 140 disposed under the TFT substrate 130, a CF substrate 120 disposed above the TFT substrate 130, an upper polarizer 110 disposed above the CF substrate 120, and the CF substrate 120. A liquid crystal layer (not shown) is disposed between the TFT substrate 130 and the TFT substrate 130. The backlight module 200 is a side-lit backlight module, and includes a reflective sheet 260. The light guide plate 250 is disposed on the reflective sheet 260. An LED lamp 240 on the reflective sheet 260 and located on a short side of the light guide plate 250, a plastic frame 230 disposed on the reflective sheet 260 and located outside the LED lamp 240, and disposed above the light guide plate 250 The optical film set 210 and the flexible circuit board 220 disposed on the LED lamp 240 and electrically connected to the LED lamp 240; in the backlight module 200, the light emitting surface 245 of the LED lamp 240 is perpendicular to the LED On the side of the lamp 240 that is in contact with the flexible circuit board 220, the plastic frame 230 is bonded to the plastic frame 300 by the double-sided tape 300. On the circuit board 220, the light guide plate 250 is adhered to the flexible circuit board 220 and the optical film group 210 by the double-sided tape 300; the lower polarizer 140 of the liquid crystal panel 100 is bonded to the lower polarizer 300 by the double-sided tape 300. The optical film set 210 in the backlight module 200 fixes the liquid crystal panel 100 and the backlight module 200 together.

At present, the backlight module produced by the latest technology in the backlight industry is only 0.43mm thinner. This kind of backlight module is not only expensive, but also requires high assembly precision, good yield control, and the backlight of 0.43mm. As the module continues to be thinner, it will encounter the problem that the height of the LED lamp is difficult to match the wedge-shaped opening of the light guide plate.

Summary of the invention

An object of the present invention is to provide a backlight module that replaces a light guide plate used in a conventional backlight module with a light guide film, and eliminates the arrangement of the reflection sheet, thereby making the thickness of the backlight module thin. The backlight module has an accommodating space inside, which can be used for designing the whole structure of the mobile phone or the tablet computer, and is used for placing the original components such as the circuit and the battery, which is beneficial to the thinness of the entire display device.

Another object of the present invention is to provide a liquid crystal display device which adopts the above-described backlight module having a special structure, thereby having a thin thickness and a good display effect.

In order to achieve the above object, the present invention provides a backlight module including a light guiding film, an optical film set disposed above the light guiding film, and disposed under the light guiding film and located at an edge of the light guiding film. The LED lamp, the flexible circuit board electrically connected to the LED lamp, and the plastic frame disposed on the outer side of the light guiding film, the optical film group and the LED lamp;

Wherein, the light emitting surface of the LED lamp is a side of the LED lamp that is in contact with the light guiding film.

An accommodating space is formed between the light guiding film and the LED lamp.

The number of the LED lamps is one, and is located at an edge position below one side of the light guiding film to realize single-side light input of the backlight module.

The number of the LED lamps is two, which are respectively located at the edge positions below the two sides of the light guiding film, and the bilateral light entering the backlight module is realized.

The flexible circuit board is disposed under the LED lamp and is fixedly connected thereto. The plastic frame is disposed on the flexible circuit board and located outside the LED lamp, and the LED lamp is fixed on the plastic frame by the double-sided tape.

The flexible circuit board is disposed on a side of the LED lamp and is fixedly connected thereto. The plastic frame is disposed on an outer side of the flexible circuit board, and the flexible circuit board is fixed on the plastic frame by a double-sided tape.

The double-sided tape is a black and white double-sided tape.

The optical film set includes a diffusion film and upper and lower prism sheets.

The thickness of the light guiding film ranges from 0.025 mm to 0.2 mm.

The present invention further provides a backlight module including a light guiding film, an optical film set disposed above the light guiding film, an LED lamp disposed under the light guiding film and located at an edge of the light guiding film, a flexible circuit board electrically connected to the LED lamp, and a plastic frame disposed on the outer side of the light guiding film, the optical film group, and the LED lamp;

Wherein, the light emitting surface of the LED lamp is a side of the LED lamp that is in contact with the light guiding film;

Wherein, an accommodating space is formed between the light guiding film and the LED lamp;

Wherein, the double-sided tape is a black and white double-sided tape;

Wherein, the optical film set includes a diffusion film and upper and lower prism sheets.

The present invention also provides a liquid crystal display device, comprising the above backlight module, and a liquid crystal panel disposed on the backlight module;

The liquid crystal panel includes a TFT substrate, a lower polarizer disposed under the TFT substrate, a CF substrate disposed above the TFT substrate, an upper polarizer disposed above the CF substrate, and the CF a liquid crystal layer between the substrate and the TFT substrate;

The lower polarizer in the liquid crystal panel is bonded to the plastic frame in the backlight module by double-sided tape, thereby fixing the liquid crystal panel and the backlight module together.

The present invention provides a backlight module and a liquid crystal display device in which the backlight module is mounted. The structure of the backlight module is replaced by a light guide film instead of the light guide plate. And omitting the arrangement of the reflective sheet, so that the backlight module has a thinner thickness, and an accommodating space is formed between the light guiding film of the backlight module and the LED lamp, so that the backlight module is mounted. When the liquid crystal display device is used for making a mobile phone or a tablet computer, the accommodating space can be designed according to the whole structure of the mobile phone or the tablet computer, and is used for placing components such as circuits and batteries, thereby making the thickness of the liquid crystal display device thinner. .

The detailed description of the present invention and the accompanying drawings are to be understood,

DRAWINGS

The technical solutions and other advantageous effects of the present invention will be apparent from the following detailed description of embodiments of the invention.

In the drawings,

1 is a schematic structural view of a conventional liquid crystal display device;

2 is a schematic structural view of a first embodiment of a backlight module of the present invention;

3 is an enlarged schematic view of an LED lamp and a flexible circuit board in the backlight module shown in FIG. 2;

4 is a schematic structural view of a second embodiment of a backlight module of the present invention;

5 is an enlarged schematic view of an LED lamp and a flexible circuit board in the backlight module shown in FIG. 4;

6 is a schematic structural view of a first embodiment of a liquid crystal display device of the present invention;

Fig. 7 is a schematic structural view showing a second embodiment of the liquid crystal display device of the present invention.

detailed description

In order to further clarify the technical means and effects of the present invention, the following detailed description will be made in conjunction with the preferred embodiments of the invention and the accompanying drawings.

Referring to FIG. 2 and FIG. 4 , the present invention firstly provides a backlight module, including a light guiding film 27 , an optical film group 21 disposed above the light guiding film 27 , and disposed under the light guiding film 27 . And an LED lamp 24 located at an edge of the light guiding film 27, a flexible circuit board 22 electrically connected to the LED lamp 24, and a light shielding film 27, an optical film group 21, and an LED lamp 24 disposed outside the LED lamp 24. Plastic frame 23.

Specifically, the light emitting surface 241 of the LED lamp 24 is a surface of the LED lamp 24 that is in contact with the light guiding film 27.

Specifically, an accommodating space 28 is formed on the inner side of the LED lamp 24 under the light guiding film 27, and the accommodating space 28 is used when the backlight module is installed in the liquid crystal display device for making a mobile phone or a tablet computer. It can be designed with the whole structure of a mobile phone or a tablet, such as a circuit, a battery, and the like.

Specifically, only one LED lamp 24 may be disposed in the backlight module, and the LED lamp 24 is located at an edge position below the light guiding film 27 to realize single-side light entering of the backlight module 20.

Optionally, two LED lamps 24 may be disposed in the backlight module, and the two LED lamps 24 are respectively located at edge positions below the two sides of the light guiding film 27 to implement bilateral sides of the backlight module. Light is incident, thereby increasing the display brightness of the liquid crystal display device.

Specifically, the double-sided tape 30 is a black and white double-sided tape.

Specifically, the optical film group 21 includes a diffusion film and upper and lower prism sheets.

Specifically, the thickness of the light guiding film 27 ranges from 0.025 mm to 0.2 mm.

Specifically, the thickness of the optical film group 21 is generally about 0.16 mm.

The limit thickness of the backlight module of the present invention is the sum of the thicknesses of the light guiding film 27 and the optical film group 21. When the thickness of the light guiding film 27 is 0.2 mm, the thickness of the optical film group 21 is 0.16 mm. The backlight module has a thickness of 0.2 mm+0.16 mm=0.36 mm, which is thinner than the thinnest 0.43 mm backlight module, and when the thickness of the light guiding film 27 is reduced, the backlight The thickness of the module will be thinner.

Further, the backlight module of the present invention provides two embodiments, the difference between the two embodiments is that the flexible circuit board 22 is mounted differently from the LED lamp 24.

2-3 is a first embodiment of the backlight module of the present invention. The flexible circuit board 22 is disposed under the LED lamp 24 and is fixedly connected thereto. The plastic frame 23 is disposed on the flexible circuit board 22 . The LED lamp 24 is fixed on the plastic frame 23 by the double-sided tape 30.

In the first embodiment, the mounting manner of the LED lamp 24 and the flexible circuit board 22 is different from the prior art. In the prior art, as shown in FIG. 1 , the light emitting surface 245 of the LED lamp 240 is perpendicular to the LED light. The light-emitting surface 241 of the LED lamp 24 is the side of the LED lamp 24 that is away from the flexible circuit board 22 in the first embodiment of the present application.

In the first embodiment, the flexible circuit board 22 is disposed on the bottom surface of the backlight module. The advantage of the arrangement is that the heat dissipation is convenient, and the backlight module is advantageously applied to the tablet computer.

Referring to FIG. 4-5, in a second embodiment of the backlight module of the present invention, the flexible circuit board 22 is disposed on a side of the LED lamp 24 and is fixedly connected thereto, and the plastic frame 23 is disposed on the flexible circuit. The flexible circuit board 22 is fixed to the plastic frame 23 by the double-sided tape 30 on the outer side of the board 22.

In the backlight module of the second embodiment, the light-emitting surface 241 of the LED lamp 24 is perpendicular to the side of the LED lamp 24 that is in contact with the flexible circuit board 22, that is, the flexible circuit board 22 and the LED. The lamp 24 is mounted in the same manner as the prior art. Compared with the first embodiment, the backlight module of the second embodiment is easier to assemble and saves production costs.

The present invention further provides a liquid crystal display device including the backlight module and the liquid crystal panel 10 disposed on the backlight module. The liquid crystal panel 10 includes a TFT substrate 13 , a lower polarizer 14 disposed under the TFT substrate 13 , a CF substrate 12 disposed above the TFT substrate 13 , and an upper polarized light disposed above the CF substrate 12 . Slice 11, and A liquid crystal layer (not shown) between the CF substrate 12 and the TFT substrate 13.

Specifically, the lower polarizer 14 of the liquid crystal panel 10 is bonded to the plastic frame 23 in the backlight module through the double-sided tape 30, thereby fixing the liquid crystal panel 10 and the backlight module together.

6 and FIG. 7 are respectively schematic structural diagrams of the first and second embodiments of the liquid crystal display device of the present invention, and the liquid crystal display devices shown in FIGS. 6 and 7 are respectively mounted with the first, FIG. 2 and FIG. The backlight module of the second embodiment has no specific details on the specific structure of the backlight module.

The liquid crystal display devices of the first and second embodiments are respectively equipped with a backlight module of a special structure, and the structure of the backlight module is replaced by a light guide film instead of the conventional backlight module, and the light guide plate is omitted. The setting of the reflective sheet is removed, thereby reducing the thickness of the backlight module, and an accommodating space is formed between the light guiding film of the backlight module and the LED lamp, when the liquid crystal display device is used for making a mobile phone or a tablet computer. The accommodating space can be designed according to the whole structure of the mobile phone or the tablet computer, and is used for placing components such as circuits and batteries, thereby further reducing the thickness of the liquid crystal display device.

In summary, the present invention provides a backlight module and a liquid crystal display device in which the backlight module is mounted. The structure of the backlight module is replaced by a light guide film instead of the light guide plate. The arrangement of the reflective sheet is omitted, so that the backlight module has a thin thickness, and an accommodating space is formed between the light guiding film of the backlight module and the LED lamp, so that the liquid crystal display of the backlight module is mounted. When the device is used for making a mobile phone or a tablet computer, the accommodating space can be designed in accordance with the overall structure of the mobile phone or the tablet computer, and is used for accommodating components such as circuits and batteries, thereby making the thickness of the liquid crystal display device thinner.

In the above, various other changes and modifications can be made in accordance with the technical solutions and technical concept of the present invention, and all such changes and modifications are within the scope of the claims of the present invention. .

Claims

A backlight module includes a light guiding film, an optical film set disposed above the light guiding film, an LED lamp disposed under the light guiding film and located at an edge of the light guiding film, and an LED lamp a flexible connecting circuit board, and a plastic frame disposed on the outer side of the light guiding film, the optical film group, and the LED lamp;

Wherein, the light emitting surface of the LED lamp is a side of the LED lamp that is in contact with the light guiding film.
The backlight module of claim 1 , wherein an accommodating space is formed between the light guiding film and the LED lamp.
The backlight module of claim 1 , wherein the number of the LED lamps is one, located at an edge position below one side of the light guiding film, and the single-sided light entering the backlight module is realized.
The backlight module of claim 1 , wherein the number of the LED lamps is two, respectively located at an edge position below the two sides of the light guiding film, to achieve bilateral light entering of the backlight module.
The backlight module of claim 1 , wherein the flexible circuit board is disposed under the LED lamp and is fixedly connected thereto, and the plastic frame is disposed on the flexible circuit board and located outside the LED lamp, the LED lamp It is fixed on the plastic frame by double-sided tape.
The backlight module of claim 1 , wherein the flexible circuit board is disposed on a side of the LED lamp and is fixedly connected thereto, the rubber frame is disposed on an outer side of the flexible circuit board, and the flexible circuit board passes through two sides. The glue is fixed on the plastic frame.
The backlight module of claim 1, wherein the double-sided tape is a black-and-white double-sided tape.
The backlight module of claim 1, wherein the optical film set comprises a diffusion film and upper and lower prism sheets.
The backlight module of claim 1, wherein the light guiding film has a thickness ranging from 0.025 mm to 0.2 mm.
A backlight module includes a light guiding film, an optical film set disposed above the light guiding film, an LED lamp disposed under the light guiding film and located at an edge of the light guiding film, and an LED lamp a flexible connecting circuit board, and a plastic frame disposed on the outer side of the light guiding film, the optical film group, and the LED lamp;

Wherein, the light emitting surface of the LED lamp is a side of the LED lamp that is in contact with the light guiding film;

Wherein, an accommodating space is formed between the light guiding film and the LED lamp;

Wherein, the double-sided tape is a black and white double-sided tape;

Wherein, the optical film set includes a diffusion film and upper and lower prism sheets.
The backlight module of claim 10, wherein the number of the LED lamps is one The edge of the light guide film is located at an edge position below the light guide film to realize the unilateral light entrance of the backlight module.
The backlight module of claim 10, wherein the number of the LED lamps is two, respectively located at an edge position below the two sides of the light guiding film, to achieve bilateral light entrance of the backlight module.
The backlight module of claim 10, wherein the flexible circuit board is disposed under the LED lamp and is fixedly connected thereto, and the plastic frame is disposed on the flexible circuit board and located outside the LED lamp, the LED lamp It is fixed on the plastic frame by double-sided tape.
The backlight module of claim 10, wherein the flexible circuit board is disposed on a side of the LED lamp and is fixedly connected thereto, the rubber frame is disposed on an outer side of the flexible circuit board, and the flexible circuit board passes through two sides. The glue is fixed on the plastic frame.
The backlight module of claim 10, wherein the light guiding film has a thickness ranging from 0.025 mm to 0.2 mm.
A liquid crystal display device comprising the backlight module of claim 1 and a liquid crystal panel disposed on the backlight module;

The liquid crystal panel includes a TFT substrate, a lower polarizer disposed under the TFT substrate, a CF substrate disposed above the TFT substrate, an upper polarizer disposed above the CF substrate, and the CF a liquid crystal layer between the substrate and the TFT substrate;

The lower polarizer in the liquid crystal panel is bonded to the plastic frame in the backlight module by double-sided tape, thereby fixing the liquid crystal panel and the backlight module together.