WO2016078123A1

WO2016078123A1 - Backlight module and display having same

Info

Publication number: WO2016078123A1
Application number: PCT/CN2014/092600
Authority: WO
Inventors: 周革革
Original assignee: 深圳市华星光电技术有限公司
Priority date: 2014-11-17
Filing date: 2014-11-29
Publication date: 2016-05-26
Also published as: CN104373871A

Abstract

A backlight module (100) comprises an optical film (20), an adhesive tape (70) and a light guide plate (40). The optical film (20) is arranged on one side of the light guide plate (40). One part of the adhesive tape (70) is adhered to the peripheral side wall of the light guide plate (40), and the other part of the adhesive tape (70) is adhered to the outer side of the optical film (20). The optical film (20) is fixed to the light guide plate (40) by means of the adhesive tape (70). Because the optical film (20) is directly and stably fixed to the light guide plate (40) by means of the adhesive tape (70), parts such as a back plate and a plastic frame in an existing backlight module (100) are omitted, assembly gaps existing in the process of assembling the backlight module (100) are eliminated, and the overall thickness of the backlight module (100) is reduced. In addition, the backlight module (100) is simple in structure, and therefore the manufacturing cost is reduced, the assembly process of the whole backlight module (100) is more convenient and rapid, and the assembly efficiency is greatly improved.

Description

Backlight module and display having the same

The present invention claims the priority of the prior application filed on November 17, 2014, entitled "Backlight Module and Display with the Backlight Module", the priority of the application No. 201410655836.5, the content of which is incorporated by reference. Into this text.

Technical field

The present invention relates to the field of illuminating display, and in particular to a backlight module and a display having the same.

Background technique

With the continuous development of backlight display technology, liquid crystal display devices such as liquid crystal displays (LCDs) have been widely used as display components in electronic products such as mobile phones, digital cameras, and personal digital assistants (PDAs). As the borders of electronic products become narrower and the technology of the liquid crystal industry continues to advance, the large size of the LCD screen display and the thinning of the frame become more and more mainstream demands in the market.

As an important component in the liquid crystal display device, the backlight module has become a trend. The narrow border means that the screen area that can be seen under the same size screen is larger and the visual effect is better. In general, the existing backlight module includes: a light guide plate, a plastic frame disposed around the light guide plate, a flexible circuit board, an optical film, and a light shielding tape, wherein the flexible circuit board is fixed by the light shielding tape On the light guide plate and the plastic frame, the optical film is fixed on the plastic frame by the light shielding tape.

However, in the process of assembly, due to the error in the assembly process of the light guide plate and the plastic frame, there is inevitably an assembly gap between the light guide plate and the plastic frame, and since the plastic frame itself has a certain thickness, this is inevitable. The thickness of the backlight module is increased, thereby increasing the overall thickness of the liquid crystal display device, which cannot meet the mainstream needs of the market. In addition, the existing backlight module requires many components and has a complicated structure, which increases the manufacturing cost. Moreover, the assembly process of the plastic frame and the light guide plate is relatively cumbersome and the assembly efficiency is low.

Summary of the invention

The invention provides a backlight module and a display having the same, which use fewer components, has the advantages of small overall thickness, simple structure, low cost, and simple and quick assembly process.

An embodiment of the present invention provides a backlight module including an optical film, an adhesive tape, and a light guide plate. The optical film is disposed on one side of the light guide plate, and a part of the adhesive tape is adhered to the Another portion of the outer peripheral side wall of the light guide plate is adhered to the outer side of the optical film, and the optical film is fixed to the light guide plate by the tape.

Wherein the tape is a double-sided tape, a part of the tape is adhered to the outer peripheral side wall of the light guide plate, and another part thereof is adhered to the side wall of the optical film and extends to adhere to the optical film. At the edge of the outer surface.

Wherein the optical film comprises an upper brightness enhancement sheet, a lower brightness enhancement sheet and a diffusion sheet, the lower brightness enhancement sheet being located between the upper brightness enhancement sheet and the diffusion sheet, a part of the adhesive tape being adhered to the Another portion of the outer peripheral side wall of the light guide plate is adhered to the side wall of the optical film and extends to adhere to the upper surface edge of the upper brightness enhancement sheet.

The light guide plate includes a light guiding surface and a back surface opposite to the light guiding surface, the light guiding surface facing the diffusion surface of the optical film, and seamlessly contacting the diffusion surface, the back surface facing The reflective sheet is in contact with the reflective sheet.

The backlight module further includes a reflective sheet facing the back surface of the light guide plate and in seamless contact with the back surface, so that light incident on the surface of the reflective sheet is reflected into the light guide plate.

Wherein, the reflective sheet is a white reflective sheet or a silver reflective sheet, and the surface thereof is coated with a reflective layer.

Wherein, the edge region of the back surface of the light guide plate is coated with a reflective coating.

Wherein, the entire back surface of the light guide plate is coated with a reflective coating such that light incident on the reflective coating is reflected into the light guide plate.

Another aspect of the present invention provides a display including a display panel and a backlight module disposed opposite the display panel, the backlight module including an optical film, a light guide plate, and a tape. An optical film is disposed on one side of the light guide plate, a part of the adhesive tape is adhered to the outer peripheral side wall of the light guide plate, and another portion is adhered to the outer side of the optical film, and the optical film passes through Said A tape is fixed to the light guide plate, and the display panel is fixed to the optical film by the tape.

Wherein the tape is a double-sided tape, a part of the tape is adhered to the outer peripheral side wall of the light guide plate, and another part thereof is adhered to the side wall of the optical film and extends to the outer surface of the optical film At the edge.

In the backlight module of the embodiment of the present invention, the optical film, the light guide plate and the reflective sheet are arranged in an overlapping manner from top to bottom, and the optical film is directly stabilized by a tape. The ground plate is fixed on the light guide plate, thereby eliminating the back plate and the plastic frame in the existing backlight module, thereby eliminating the assembly gap existing in the assembly process of the backlight module and reducing the backlight. The overall thickness of the module. In addition, due to the simple structure of the backlight module, the manufacturing cost is reduced, and the assembly process of the entire backlight module is more convenient, thereby greatly improving the assembly efficiency.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the following description The drawings in the drawings are only some of the embodiments of the present invention, and those skilled in the art can obtain other drawings according to the drawings without any creative work.

1 is a partial cross-sectional view of a backlight module in accordance with an embodiment of the present invention.

2 is a partial cross-sectional view of a display in accordance with another embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Please refer to FIG. 1. FIG. 1 is a partial cross-sectional view of a backlight module according to an embodiment of the present invention. As shown in FIG. 1 , a backlight module 100 according to an embodiment of the present invention may be a liquid crystal backlight module including an optical film 20 , a light guide plate 40 , and a reflective sheet 60 . The optical film 20 and the light guide plate 40 . And the reflection sheet 60 is arranged in an overlapping manner from top to bottom, that is, the light guide plate 40 is located between the optical film 20 and the emission sheet 60. Preferably, the outer circumferences of the optical film 20, the light guide plate 40 and the reflection sheet 60 are aligned with each other.

In the embodiment of the present invention, the optical film 20 is fixed on the light guide plate 40 by an adhesive tape 70. Specifically, a part of the adhesive tape 70 is adhered to the outer peripheral side wall of the light guide plate 40. A portion is adhered to the outer peripheral side wall of the optical film 20, preferably, a portion of the adhesive tape 70 is adhered to the outer peripheral side wall of the light guide plate 40, and another portion thereof is adhered to the optical film 20 The side walls are extended and adhered to the outer surface edges of the optical film 20 such that the optical film 20 is more firmly fixed to the light guide plate 40. In the embodiment of the present invention, the tape 70 is a double-sided tape, which can reduce light leakage of the backlight module 100 and improve display quality.

As shown in FIG. 1, in the embodiment of the present invention, the optical film 20 includes an upper brightness enhancement sheet 21, a lower brightness enhancement sheet 23, and a diffusion sheet 25. The upper brightness enhancement sheet 21, the lower brightness enhancement sheet 23, and the diffusion sheet 25 are arranged in an overlapping manner from top to bottom, that is, the lower brightness enhancement sheet 23 is located between the upper brightness enhancement sheet 21 and the diffusion sheet 25. . Another portion of the adhesive tape 70 is adhered to the sidewall of the optical film 20 and extends to adhere to the upper surface edge of the upper brightness enhancement sheet 21, and the light guide plate 40 is located at the optical film 20 One side, that is, the light guide plate 40 is located at one side of the diffusion sheet 25 for guiding the light guide plate 40.

In the embodiment of the present invention, the shape and size of the light guide plate 40 are matched with the shape and size of the optical film 20, and the light guide plate 40 is disposed between the diffusion sheet 25 and the reflection sheet 60. . The light guide plate 40 is made of a substrate of a polymethyl methacrylate (PMMA)/polycarbonate (PC), which is used to convert a line source into a surface source. The light guide plate 40 includes a light guide surface 42 and a back surface 44 opposite to the light guide surface 42 . The light guide surface 42 faces the diffusion surface 25 of the optical film 20 and is in seamless contact with the diffusion surface 25 . The back surface 44 faces the reflection sheet 60 and is in seamless contact with the reflection sheet 60, so that the overall thickness of the backlight module 100 can also be reduced. The reflection sheet 60 is disposed opposite to the back surface 44, so that light incident on the surface of the reflection sheet 60 is totally reflected into the light guide plate 40, thereby improving display quality.

In the embodiment of the present invention, the shape and size of the reflective sheet 60 are matched with the shape and size of the light guide plate 40. The reflective sheet 60 is disposed on the back surface 44 of the light guide plate 40, and the back surface 44 Seamless contact. The reflective sheet 60 is a reflective sheet having high reflectivity for improving the front view brightness of the liquid crystal backlight module when a certain light source is output.

It can be understood that, in order to preferably reduce light leakage, the edge region of the back surface 44 of the light guide plate 40 may be coated with a reflective coating (not shown) to prevent light from the edge region of the back surface 44 of the light guide plate 40. Leak out to improve the display.

In addition, it can be understood that, in other embodiments of the present invention, the entire back surface 44 of the light guide plate 40 may be coated with a reflective coating such that light incident on the reflective coating is reflected into the light guide plate 40, In place of the above-described reflective sheet 60, and having the same or similar function as the reflective sheet 60, the thickness of the entire backlight module is reduced.

It is to be understood that, in other embodiments of the present invention, the backlight module 100 may further include a light source (not shown) disposed on one side of the light guide plate 40 to provide a backlight, and the light source emits Light is incident into the light guide plate 40. Preferably, the light source can be an LED light source, and the LED light source adopts a DC power source and has a long service life.

In addition, the reflective sheet 60 may be a white reflective sheet or a silver reflective sheet, the surface of which is coated with a reflective layer, and the coated reflective layer is made of a reflective material having a reflectance of 50% or more to improve the reflection effect.

As can be seen from the above, in the backlight module 100 of the embodiment of the present invention, the optical film 20, the light guide plate 40 and the reflection sheet 60 are arranged in an overlapping manner from top to bottom, and the optical film 20 is directly The tape 70 is firmly fixed to the light guide plate 40, thereby eliminating the components such as the back plate and the plastic frame in the existing backlight module, thereby eliminating the assembly gap existing in the assembly process of the backlight module 100, and The overall thickness of the backlight module 100 is reduced. In addition, since the backlight module 100 has a simple structure, the manufacturing cost is reduced, and the assembly process of the entire backlight module is more convenient, and the assembly efficiency is greatly improved.

Please refer to FIG. 2. FIG. 2 is a partial cross-sectional view of a display according to another embodiment of the present invention. As shown in FIG. 2 , the display includes a display panel 80 and the backlight module 100 described in the above embodiment. The backlight module 100 is disposed opposite to the display panel 80 to provide backlight. Specifically, the peripheral side edge of the display panel 80 is fixed to the backlight module 100 by the tape 70. Specifically, the display panel 80 is disposed on the surface of the upper brightness enhancement sheet 21 of the optical film 20, and The peripheral side edge thereof is fixed to the optical film 20 by the above-described tape 70. The display panel 80 can be a liquid crystal display, and the configuration of the backlight module 100 constituting the display is the same as that of the backlight module 100 shown in FIG. 1 , and details are not described herein again.

It can be understood that the display and the backlight module 100 can be applied to any product or component having a display function, such as an electronic paper, a liquid crystal television, a liquid crystal display, a mobile phone, a digital photo frame, a tablet computer, and the like.

The above disclosure is only a preferred embodiment of the present invention, and of course, the scope of the present invention is not limited thereto, and those skilled in the art can understand all or part of the process of implementing the above embodiments, and according to the present invention. The equivalent changes required are still within the scope of the invention.

Claims

A backlight module includes an optical film and a light guide plate, and the optical film is disposed on one side of the light guide plate, wherein the backlight module further includes a tape, and a part of the tape Adhered to the outer peripheral side wall of the light guide plate, another portion is adhered to the outer side of the optical film, and the optical film is fixed to the light guide plate by the adhesive tape.
The backlight module according to claim 1, wherein the adhesive tape is a double-sided tape, a part of the adhesive tape is adhered to a peripheral side wall of the light guide plate, and another portion of the adhesive tape is adhered to the optical film. The sidewalls extend and adhere to the edges of the outer surface of the optical film.
The backlight module of claim 1 , wherein the optical film comprises an upper brightness enhancement sheet, a lower brightness enhancement sheet and a diffusion sheet, wherein the lower brightness enhancement sheet is located on the upper brightness enhancement sheet and the diffusion sheet Between the portions of the tape is adhered to the outer peripheral side wall of the light guide plate, and another portion thereof is adhered to the side wall of the optical film and extends to adhere to the upper surface edge of the upper brightness enhancement sheet.
The backlight module of claim 3, wherein the light guide plate comprises a light guiding surface and a back surface opposite to the light guiding surface, the light guiding surface facing the diffusion surface of the optical film, And in seamless contact with the diffusing surface, the back surface faces the reflective sheet and is in seamless contact with the reflective sheet.
The backlight module as claimed in claim 4, wherein the backlight module further comprises a reflective sheet, the reflective sheet facing the back surface of the light guide plate and in seamless contact with the back surface, so that the incident Light from the surface of the reflective sheet is reflected into the light guide plate.
The backlight module according to claim 5, wherein the reflective sheet is a white reflective sheet or a silver reflective sheet, the surface of which is coated with a reflective layer.
The backlight module of claim 5, wherein the edge region of the back surface of the light guide plate is coated with a reflective coating.
The backlight module of claim 4, wherein the entire back surface of the light guide plate is coated with a reflective coating such that light incident on the reflective coating is reflected into the light guide plate.
A display device includes a display panel, wherein the display further includes a backlight module disposed opposite to the display panel, the backlight module includes an optical film, a light guide plate and a tape. The optical film is disposed on one side of the light guide plate, a part of the tape is adhered to the outer peripheral side wall of the light guide plate, and another portion is adhered to the outer side of the optical film, the optical film The tape is fixed to the light guide plate by the tape, and the display panel is fixed to the optical film by the tape.
A display according to claim 9, wherein said tape is a double-sided tape, a part of which is adhered to the outer peripheral side wall of said light guide plate, and another portion of which is adhered to the side of said optical film The wall extends to the outer surface edge of the optical film.
The display according to claim 9, wherein said optical film comprises an upper brightness enhancement sheet, a lower brightness enhancement sheet and a diffusion sheet, said lower brightness enhancement sheet being located between said upper brightness enhancement sheet and said diffusion sheet A portion of the tape is adhered to the outer peripheral side wall of the light guide plate, and another portion thereof is adhered to the side wall of the optical film and extends to adhere to the upper surface edge of the upper brightness enhancement sheet.
The display according to claim 11, wherein the light guide plate comprises a light guiding surface and a back surface opposite to the light guiding surface, the light guiding surface facing the diffusion surface of the optical film, and The diffusing surface is in seamless contact, and the back surface faces the reflecting sheet and is in seamless contact with the reflecting sheet.
The display device as claimed in claim 12, wherein the backlight module further comprises a reflective sheet, the reflective sheet facing the back surface of the light guide plate and in seamless contact with the back surface, so that the reflective sheet is incident on the reflective sheet The light of the surface is reflected into the light guide plate.
The display according to claim 13 wherein said reflective sheet is a white reflective sheet Or a silver reflective sheet whose surface is coated with a reflective layer.
The display of claim 13 wherein the edge region of the back side of the light guide plate is coated with a reflective coating.
The display according to claim 12, wherein the entire back surface of the light guide plate is coated with a reflective coating such that light incident on the reflective coating is reflected into the light guide plate.