WO2014127559A1

WO2014127559A1 - Backlight module and display device

Info

Publication number: WO2014127559A1
Application number: PCT/CN2013/073642
Authority: WO
Inventors: 何书勇; 康亚玲
Original assignee: 京东方科技集团股份有限公司; 合肥京东方光电科技有限公司
Priority date: 2013-02-20
Filing date: 2013-04-02
Publication date: 2014-08-28
Also published as: CN203068333U

Abstract

A backlight module and a display device. The backlight module comprises a light guide plate (5) and an optical film material (2) disposed on a light output surface of the light guide plate (5), a light-emitting member (7) is disposed on a side edge of the light guide plate (5), and the optical film material (2) is fixed on a back surface of a display panel (1) disposed adjacent to the backlight module. The overall thickness and quality of the backlight module are reduced, and the material and labor costs are greatly saved.

Description

Backlight module and display device

Embodiments of the present invention relate to a backlight module and a display device. Background technique

The liquid crystal display has the advantages of small size, low power consumption, no radiation, and the like, and has occupied a dominant position in the field of flat panel display.

The liquid crystal display includes a liquid crystal panel. Since the liquid crystal panel itself does not emit light, the liquid crystal display usually includes a backlight module to provide a light source for the liquid crystal panel. At present, the main components of the backlight module include a light-emitting component, a reflective sheet, a light guide plate, an optical film, a plastic frame, and a back plate. The backboard is used to carry light-emitting elements, reflective sheets, light guides, and optical films; the plastic frames are used to connect, position, or support other components. The assembled backlight module and the display panel are fixed by the back cover and the front cover card to form a display device. In the structure, some cushion rubber tape adhered between the front cover card and the display panel may be provided, and the pressure may be buffered when the display panel is pressed.

Nowadays, the appearance of an electronic device tends to be slim, so that a display device for an electronic device is gradually required to be ultra-thin; however, the display device having the above structure has a back plate and a plastic frame, and the back plate has a certain thickness, and at the same time The plastic frame occupies a large area and has a complicated structure, which causes the display device to be thick and heavy, resulting in a relatively large thickness of the electronic device to which the display device is applied, and a user experience is poor.

Therefore, it is desirable to provide a backlight module and a display device that can achieve an ultra-thin effect better. Summary of the invention

Embodiments of the present invention provide a backlight module and a display device capable of better achieving an ultra-thin effect, reducing the space occupation of the display device, and satisfying the consumer's requirement for ultra-thinness of the electronic device.

An aspect of the present invention provides a backlight module including a light guide plate and an optical film disposed on a light exit surface of the light guide plate, wherein the light guide plate is provided with a light emitting element at a side thereof; The back side of the display panel adjacent to the backlight module.

For example, the backlight module may further include a reflective sheet disposed on the other surface of the light guide plate opposite to the light emitting surface. For example, the optical film may be bonded to the back surface of the display panel by a tape or an adhesive. For example, the display panel may have a display area and a non-display area; the adhesive areas of the tape or the adhesive are located at positions corresponding to the non-display area.

For example, the light emitting element may be bonded to the side of the light guide plate.

For example, the optical film may include a prism film and a diffusion film.

Another aspect of the present invention also provides a display device including a display panel and any of the backlight modules described above.

For example, the display device may further include a back cover, and an inner side of the inner surface of the back cover is provided with an accommodating space adapted to the backlight module; the backlight module is fixed in the accommodating space.

For example, the front side of the display surface of the display device may be provided with a front cover card, and the backlight module and the display panel are engaged and fixed in the accommodating space by the front cover card. DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below. It is obvious that the drawings in the following description relate only to some embodiments of the present invention, rather than to the present invention. limit.

1 is an exploded perspective view of a backlight module of the present invention;

2 is a schematic view showing a distribution of bonding areas of components of the backlight module of FIG. 1;

3 is another schematic view showing the distribution of the bonding regions of the components of the backlight module of FIG. 1;

4 is a schematic cross-sectional view showing the structure of a display device in the prior art;

Figure 5 is a cross-sectional view showing the structure of a display device of the present invention.

Reference mark:

1: display panel; 2: optical film; 2a: prism film; 2b: diffusion film; 3: plastic frame; 4: back plate; 5: light guide plate; 6: reflective sheet; 7; light-emitting element; ; 9: Front cover card; 10: cushion tape. detailed description

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will be combined with the present invention. The technical solutions of the embodiments of the present invention are clearly and completely described in the accompanying drawings. It is apparent that the described embodiments are part of the embodiments of the invention, rather than all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the described embodiments of the present invention without departing from the scope of the invention are within the scope of the invention.

Unless otherwise defined, technical terms or scientific terms used herein shall be of the ordinary meaning understood by those of ordinary skill in the art to which the invention pertains. The words "a", "an" or "the" do not mean a quantity limitation, but mean that there is at least one. The words "including" or "comprising", etc., are intended to mean that the elements or objects preceding "including" or "comprising" are intended to encompass the elements or Component or object. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "Down", "Left", "Right", etc. are only used to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationship may also change accordingly.

Hereinafter, the back surface of the display panel refers to the light incident surface of the display panel, the back surface of the light guide plate refers to the opposite surface to the light exit surface of the light guide plate, and the back surface of the optical film material refers to the light incident surface of the optical film material.

Embodiment 1

A backlight module shown in FIG. 1 is disposed adjacent to the liquid crystal panel 1, and includes a light guide plate 5 and a reflection sheet 6 disposed on the back surface of the light guide plate 5. The back surface of the light guide plate 5 refers to the opposite surface to the light-emitting surface of the light guide plate 5. The main function of the light guide plate 5 is to uniformly guide the light beam emitted from the light-emitting element 7 to the side (the lower side in FIG. 1) where the liquid crystal panel 1 is located, and the structure and material thereof have the final brightness and uniformity of the backlight module. It plays a big role. The reflective sheet 6 is used to reflect the light energy escaping from the bottom surface of the light guide plate 5 back to the light guide plate 5 to improve the utilization of the light source. The light-emitting surface of the light guide plate 5 is provided with an optical film 2 for changing the direction of the light emitted from the light guide plate 5 and enhancing the light intensity of the emitted light. The optical film 2 is, for example, a multilayer functional film, and may include a prism film 2a (also called a prism film 2a). The prism sheet) and the diffusion film 2b (also referred to as a diffusion sheet or a diffusion plate) may further include a brightness enhancement film (also referred to as a brightness enhancement film), a protective film, and the like (not shown); the prism film 2a may The light is concentrated in the normal direction of the light-emitting surface, thereby improving the front brightness and the brightness performance, thereby achieving the purpose of brightening, energy saving and power saving; the main function of the diffusion film 2b is to scatter the light transmitted through the light guide plate to achieve atomization. The effect is to provide uniform and soft light to the liquid crystal panel 1.

The backlight module can be divided into a direct type backlight module or a side entry according to the distribution position of the light emitting elements. Backlight module. In order to achieve a better ultra-thin effect, the light-emitting element 7 in this embodiment is preferably disposed on the side of the light guide plate 5, that is, a side-entry backlight module is used. Such a structure can reduce the thickness of the entire backlight module 100. In this embodiment, the optical film 2 can be fixed on the back surface of the display panel 1 by adhesive tape (for example, double-sided tape or the like) or an adhesive; the light guide plate 5 It may be adhesively fixed to the back surface of the optical film 2 by a tape, an adhesive or other means available in the prior art; the reflective sheet 6 may be bonded and fixed by a tape, an adhesive or other means in the prior art. On the back side of the light plate 5, the light-emitting elements 7 may be fixed to the side of the light guide plate 5 by adhesion. In this embodiment, the components of the backlight module are directly or indirectly bonded to the back of the display panel, thereby avoiding the use of the back panel and the plastic frame which are indispensable in the conventional backlight module, and reducing the backlight module. The thickness and quality are lighter and thinner, and the material and labor costs are greatly saved. At the same time, the manufacturing process of the backlight module is completed.

It should be noted that, in this embodiment, it is not limited to the fixing manner of bonding, and other connection components or connection methods that do not damage the display panel and can realize combined fixation are applicable to the present invention. For example, the reflective coating or the reflective film may be covered on the back side of the light guide plate, and the effect is the same as the above-mentioned reflective sheet, so that the reflective sheet can be omitted; even in the backlight module for double-sided display, the reflective sheet or reflection can be omitted. Coatings and the like; and, for example, some existing functional light guide plates cover the functions of the above-mentioned reflective sheet, light guide plate and optical film, which can also be used in the present embodiment, for example, directly bonded to the display. The back of the panel; in these cases, the components do not have to be bonded together.

Generally, the display panel has a display area and a non-display area, for example, at the periphery of the display area. In the present embodiment, in order to avoid that the adhesive area of the adhesive tape or the adhesive affects the display effect at the time of bonding, the adhesive area may be disposed at a position corresponding to the non-display area or the non-display area on the other components. For example, a specific operation mode may reserve a tape or an adhesive-coated area on a display panel, an optical film, and a non-display area or a non-display area corresponding to the light guide plate, and mark it by a mark (MARK) line. Come out, attach the tape to the marked area or apply the adhesive to the marked area. For example, as shown in FIG. 2, a region where the reflection sheet 6, the light guide plate 5, and the optical film 2 are bonded (A region in the drawing) is disposed on the peripheral edge regions of the reflection sheet 6, the light guide plate 5, and the optical film 2; Alternatively, as shown in FIG. 3, a bonded region (A region in the drawing) may be provided on the side of the reflection sheet 6, the light guide plate 5, and the optical film 2. These bonded areas may be in the non-display area of the corresponding display panel, outside of the display area. The light-emitting element 7 may be an LED (Light Emitting Diode) strip, a CCFL (Cold Cathode Fluorescent Lamp) or other illuminable element. The light-emitting element in this embodiment can adopt an LED light bar; the LED light bar is used as the light-emitting element, and the main purpose is to improve the display image quality, especially in color saturation. The LED-backlit display can achieve a wide enough color gamut to compensate for the lack of display color of the liquid crystal display device. For example, because of the planar light source characteristics of LED strips, more accurate color reproduction can be achieved.

Embodiment 2

The present embodiment further provides a display device for applying the backlight module according to the first embodiment, which includes any of the above backlight modules. For example, the display device may be: a product or a component having any display function, such as a notebook computer display screen, a liquid crystal television, a digital photo frame, a mobile phone, or a tablet computer. In this embodiment, a notebook computer display screen is taken as an example for description.

The notebook display includes a display panel and a back cover. In the assembly process of the existing notebook computer display, the display module with the back plate and the plastic frame is used, which leads to an increase in the thickness of the display after the final assembly. The products thus obtained have little effect on traditional notebook computers, but the emphasis on thin and light computers, such as Ultrabooks, will make the thickness of the computer difficult to compress.

4 is a schematic cross-sectional view showing the structure of a display device in the prior art. As shown in Fig. 4, the front side of the display surface of the display device is provided with a front cover card 9, and the back cover 8 has an accommodation space. For example, the front cover card 9 is formed in a groove shape to accommodate the frame portion; the back cover 8 is formed in a flat box shape to accommodate the backlight module. The backlight module includes a back plate 4, a light guide plate 5, and a reflective sheet disposed on the back surface of the light guide plate 5. The light exit surface of the light guide plate 5 is provided with an optical film 2, and the LED light strip 7 is disposed on the side of the light guide plate 2; 4 is used for carrying other components of the backlight module, and a plastic frame 3 is further disposed between the back plate 4 and the display panel 1 , and the plastic frame 3 functions as a support, and also functions as a fixed reflection plate 6 and a light guide plate 5 . The functions of the optical film 2 and the like; the backlight module and the display panel 1 are locked and fixed in the accommodating space on the back cover 8 by the front cover clips 9. In order to prevent squeezing to the display panel 1, a cushion tape 10 is usually provided at a portion where the display panel 1 may contact or has contacted the frame 3 or the front cover card 9.

The display device in this embodiment directly fixes the backlight module described in the first embodiment to the back cover. As shown in the cross-sectional view of FIG. 5, an accommodating space corresponding to the backlight module described in the first embodiment is opened on the inner surface of the flat-shaped back cover 8, and the backlight module is fixed to the back cover. 8 Included in the space. It should be noted that the above-mentioned accommodation space is provided only for achieving a better ultra-thin effect; a front cover card 9 is provided on the display surface side of the display device, and the front cover card 9 has, for example, an L-shaped cross section. The backlight module includes a light guide plate 5 and a reflection sheet 6 disposed on the back surface of the light guide plate 5; the light exit surface of the light guide plate 5 is provided with an optical film 2, and the LED light strip 7 is disposed on the side of the light guide plate 5; the optical film 2 can be adhered In the back surface of the display panel 1, the light guide plate 5 can be adhered to the back surface of the optical film 2, the reflective sheet 6 can be adhered to the back surface of the light guide plate 5, and the light-emitting element 7 can be adhered to the side of the light guide plate 5; The group and the display panel 1 are locked and fixed in the accommodating space on the back cover 8 by the front cover card 9; and other components such as the cushion tape can be set according to actual needs. In this way, since the display module is directly integrated into the back cover 8 of the notebook computer, the accommodating space of the back cover 8 and the back cover 8 can function as the back plate and the plastic frame in the prior art as shown in FIG. 4; Therefore, the embodiment can not only save the backboard and the plastic frame, but also achieve the purpose of lightness and thinness and cost saving.

In summary, the backlight module and the display device of the embodiments of the present invention provide powerful technical support for the thinning and thinning of electronic devices, and have broad application prospects.

According to the backlight module of the embodiment of the present invention, since the components such as the light-emitting element, the reflective sheet, the light guide plate, and the optical film are directly or indirectly fixed on the display panel, it is no longer necessary to provide the back plate and the plastic frame. The overall thickness and quality of the backlight module can be reduced, and the material and the labor cost are greatly saved. The display device according to the embodiment of the invention further has an accommodating space on the inner surface of the back cover, and the backlight is provided. The module and the display panel are directly or indirectly fixed therein, and the back cover functions as a back plate and a plastic frame in the prior art, which further reduces the thickness of the display device, thereby achieving an ultra-thin effect.

The above is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. The scope of the present invention is defined by the appended claims.

Claims

claims

1. A backlight module, including a light guide plate and an optical film material disposed on the light exit surface of the light guide plate. A light-emitting element is provided on the side of the light guide plate; the optical film material is fixed to the backlight module. adjacent to the back of the display panel.

2. The backlight module according to claim 1, wherein the backlight module further includes a reflective sheet, and the reflective sheet is disposed on the other side of the light guide plate opposite to the light-emitting surface.

3. The backlight module according to claim 2, wherein the reflective sheet is bonded to the back of the light guide plate through tape or adhesive.

4. The backlight module according to any one of claims 1 to 3, wherein the optical film material is bonded to the back of the display panel through tape or adhesive.

5. The backlight module according to any one of claims 1 to 4, wherein the light guide plate is bonded to the back of the optical film through tape or adhesive.

6. The backlight module according to any one of claims 1 to 5, wherein the display panel has a display area and a non-display area; the adhesive areas of the tape or adhesive are located corresponding to the non-display area. s position.

7. The backlight module according to any one of claims 1 to 6, wherein the light-emitting element is bonded to the side of the light guide plate.

8. The backlight module according to any one of claims 1 to 7, wherein the optical film material includes a prism film and a diffusion film.

9. A display device, comprising a display panel and the backlight module according to any one of claims 1-8.

10. The display device according to claim 9, wherein the display device includes a back cover, and an accommodation space adapted to the backlight module is provided on one side of the inner surface of the back cover; the backlight module is fixed in the accommodation space.

11. The display device according to claim 10, wherein a front cover clip is provided on one side of the display surface of the display device, and the backlight module and the display panel are engaged and fixed by the front cover clip. in the accommodation space.