Backlight modules and liquid crystal devices (LCDS)

A backlight module and a liquid crystal device (LCD) are disclosed. The backlight module includes a light guiding plate, a plastic frame adjacent to a lateral side of the light guiding plate, and a reflective sheet. The reflective sheet includes a first portion, a second portion, and a third portion. The first portion of the reflective sheet is arranged below a bottom of the light guiding plate and/or a bottom of the plastic frame, the second portion of the reflective sheet adheres to a lateral side of the plastic frame, and the lateral side faces away from the light guiding plate, and the third portion of the reflective sheet adheres to a top surface of the plastic frame. With such configuration, the reflective sheet may be stably fixed on the plastic frame to prevent the reflective sheet from being detached.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present disclosure relates to liquid crystal display technology, and more particularly to a backlight module and a LCD.

2. Discussion of the Related Art

Currently, LCDs have been widely adopted ad display devices in a variety of electronic device. Due to the thin and light trend, borders of the electronic devices are designed to be as narrow as possible. However, the backlight module is one key component of LCDs, the border of the backlight module also bounds to the narrow border design.

The reflective sheet within the backlight module is usually adhered to a bottom surface of the plastic frame via double-sided adhesive. As the width of the plastic frame has been gradually narrow, the dimension of the bonding surface between the reflective sheet and the plastic frame has been decreased, which reduces the bonding strength of the double-sided adhesive between the plastic frame and the reflective sheet. As such, the bonding between the reflective sheet and the plastic frame is not stable, and thus the reflective sheet may be detached.

SUMMARY

The object of the invention is to provide a backlight module and a LCD for stably fixing the reflective sheet on the plastic frame so as to prevent the reflective sheet from being detached.

In one aspect, a backlight module includes: a light guiding plate; a plastic frame adjacent to a lateral side of the light guiding plate; at least one optical film arranged above a top of the light guiding plate; a reflective sheet including a first portion, a second portion, and a third portion, the first portion of the reflective sheet is arranged below a bottom of the light guiding plate and/or a bottom of the plastic frame, the second portion of the reflective sheet adheres to a lateral side of the plastic frame, and the lateral side faces away from the light guiding plate, the third portion of the reflective sheet adheres to a top surface of the plastic frame, the second portion of the reflective sheet adheres to the lateral side of the plastic frame facing away from the light guiding plate by adhesive technology, a surface of the third portion of the reflective sheet facing toward the top surface of the plastic frame includes a plurality of openings, the top surface of the plastic frame includes a plurality of corresponding protrusions, during an assembling process, the protrusions of the top surface of the plastic frame engage with the openings of the third portion of the reflective sheet such that the third portion of the reflective sheet is fastened on the top surface of the plastic frame and the optical film by the adhesive technology.

Wherein the second portion of the reflective sheet adheres to the lateral side of the plastic frame facing away the light guiding plate via double-sided adhesive, the third portion of the reflective sheet adheres to the top surface of the plastic frame and the optical film via double-sided adhesive.

Wherein the first portion of the reflective sheet adheres to the bottom of the light guiding plate and/or the bottom of the plastic frame via adhesive technology.

Wherein the surface of the third portion of the reflective sheet facing toward the top surface of the plastic frame adheres to the top surface of the plastic frame and the optical film via double-sided adhesive, and the other surface of the third portion facing away the top surface of the plastic frame is coated with an adhesive layer to adhere the protrusions of the top surface of the plastic frame to the openings of the third portion of the reflective sheet.

Wherein the second portion of the reflective sheet is adhered to the lateral side of the plastic frame facing away the light guiding plate via the double-sided adhesive.

Wherein the first portion of the reflective sheet adheres to the bottom of the light guiding plate and/or the bottom of the plastic frame130via the double-sided adhesive.

In another aspect, a backlight module includes: a light guiding plate; a plastic frame adjacent to a lateral side of the light guiding plate; and a reflective sheet including a first portion, a second portion, and a third portion, the first portion of the reflective sheet is arranged below a bottom of the light guiding plate and/or a bottom of the plastic frame, the second portion of the reflective sheet adheres to a lateral side of the plastic frame, and the lateral side faces away from the light guiding plate, and the third portion of the reflective sheet adheres to a top surface of the plastic frame.

Wherein the backlight module further includes at least one optical film arranged above a top of the light guiding plate.

Wherein the second portion of the reflective sheet adheres to the lateral side of the plastic frame facing away the light guiding plate via adhesive technology, and the third portion of the reflective sheet adheres to the top surface of the plastic frame and the optical film via the adhesive technology.

Wherein the second portion of the reflective sheet adheres to the lateral side of the plastic frame facing away the light guiding plate via double-sided adhesive, and the third portion of the reflective sheet adheres to the top surface of the plastic frame and the optical film via the double-sided adhesive.

Wherein the first portion of the reflective sheet adheres to the bottom of the light guiding plate and/or the bottom of the plastic frame via adhesive technology.

Wherein a surface of the third portion of the reflective sheet facing toward the top surface of the plastic frame includes a plurality of openings, the top surface of the plastic frame includes a plurality of corresponding protrusions, during an assembling process, and the protrusions of the top surface of the plastic frame engage with the openings of the third portion of the reflective sheet.

Wherein the surface of the third portion of the reflective sheet facing toward the top surface of the plastic frame adheres to the top surface of the plastic frame and the optical film via double-sided adhesive, and the other surface of the third portion facing away the top surface of the plastic frame is coated with an adhesive layer to adhere the protrusions of the top surface of the plastic frame to the openings of the third portion of the reflective sheet.

Wherein the second portion of the reflective sheet is adhered to the lateral side of the plastic frame facing away the light guiding plate via the double-sided adhesive.

Wherein the first portion of the reflective sheet adheres to the bottom of the light guiding plate and/or the bottom of the plastic frame130via the double-sided adhesive.

In another aspect, a LCD including any one of the above backlight module.

In view of the above, the reflective sheet includes a first portion, a second portion, and a third portion. The first portion of the reflective sheet is arranged below a bottom of the light guiding plate and/or a bottom of the plastic frame, the second portion of the reflective sheet adheres to a lateral side of the plastic frame, and the lateral side faces away from the light guiding plate, and the third portion of the reflective sheet adheres to a top surface of the plastic frame. As the reflective sheet includes the three portions, such that the reflective sheet not only adheres to the bottom of the plastic frame, but also adheres to the lateral side of the light guiding plate facing away the plastic frame and the top surface of the plastic frame. With such configuration, even though the border of the plastic frame is narrow, the reflective sheet may be stably adhered to the plastic frame so as to prevent the reflective sheet from being detached.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Embodiments of the invention will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown.

Referring toFIG. 1, the backlight module100includes a light guiding plate110, a plastic frame130, and a reflective sheet140.

The light guiding plate110is configured for converting the dot light source or line light source from lamps to a surface light source. The light guiding plate110may be made by any conventional material of the light guiding plate, such as optical grade acrylic.

The plastic frame130is arranged to be adjacent to a lateral side112of the light guiding plate110. The plastic frame130supports and protects the light guiding plate110.

The reflective sheet140includes a first portion142, a second portion144, and a third portion146. The first portion142of the reflective sheet140is arranged below a bottom114of the light guiding plate110and/or a bottom134of the plastic frame130. The second portion144of the reflective sheet140adheres to a lateral side136of the plastic frame130, and the lateral side136is facing away from the light guiding plate110. The third portion146of the reflective sheet140adheres to a top surface132of the plastic frame130.

Comparing to the conventional configuration, the reflective sheet140includes the first portion142, the second portion144, and the third portion146. The first portion142of the reflective sheet140is arranged below a bottom114of the light guiding plate110and/or a bottom134of the plastic frame130. The second portion144of the reflective sheet140adheres to a lateral side136of the plastic frame130, and the lateral side136faces away from the light guiding plate110. The third portion146of the reflective sheet140adheres to a top surface132of the plastic frame130. As the reflective sheet140includes the three portions. As such, the reflective sheet140not only adheres to the bottom134of the plastic frame130, but also adheres to the lateral side136of the plastic frame130and the top surface132of the plastic frame130. In this way, even though the width of the plastic frame130is narrow, the reflective sheet140may be stably fixed on the plastic frame130to prevent the reflective sheet140from being detached.

Further, the backlight module100includes at least one optical film120arranged above the top of the light guiding plate110. The top is opposite to the bottom114of the light guiding plate110.

The second portion144of the reflective sheet140adheres to the lateral side136of the plastic frame130by adhesive technology, and the third portion146of the reflective sheet140also adheres to the top surface132of the plastic frame130via the adhesive technology.

Furthermore, the third portion146of the reflective sheet140adheres to the top surface132of the plastic frame130and the optical film120. Specifically, the third portion146of the reflective sheet140adheres to the top surface132of the plastic frame130and the a top surface122of the optical film120.

The adhesive technology relates to bonding two different objects with adhesive materials. The adhesive technology is not limited to a coated glue layer or adhesive double-sided adhesive.

In the embodiment, the second portion144of the reflective sheet140adheres to the lateral side136of the plastic frame130via double-sided adhesive150, and the third portion146of the reflective sheet140adheres to the top surface132of the plastic frame130and the optical film120via the double-sided adhesive150.

FIG. 2is a cross-sectional view of the backlight module in accordance with another embodiment. The first portion142of the reflective sheet140may adhere to the bottom114of the light guiding plate110and/or the bottom134of the plastic frame130via adhesive technology. The adhesive technology is not limited to a coated glue layer or adhesive double-sided adhesive. In the embodiment, the adhesive technology relates to the double-sided adhesive150.

Comparing to the conventional solution, the first portion142, the second portion144, the third portion146of the reflective sheet140adhere to the corresponding locations of the plastic frame130via the adhesive technology such that the reflective sheet140may be stably adhere to the plastic frame130, and thus the reflective sheet140is prevented from being detached. Further, the backlight module100also includes the optical film120. The third portion146of the reflective sheet140also adheres to the optical film120via adhesive technology such that the optical film120is fixed within the plastic frame130. In addition, an area where the reflective sheet140overlaps with the optical film120may reflect back the leaked light beams to enhance the light efficiency.

FIGS. 3-5relate to another embodiment of the pull-up maintaining unit300having a light guiding plate310, a plastic frame330, and a reflective sheet340. The light guiding plate310and the plastic frame330in this embodiment are the same with the light guiding plate110and the plastic frame130in the above embodiment.

The reflective sheet340includes a first portion342, a second portion344, and a third portion346. The bonding locations of the first portion342and the second portion344are similar to that of the first portion142and the second portion144of the second portion144of the backlight module100.

The difference resides in that the surface of the third portion346of the reflective sheet340facing toward the top surface332of the plastic frame330includes a plurality of openings3462. The top surface332of the plastic frame330includes a plurality of corresponding protrusions3322. During an assembling process, the protrusions3322of the top surface332of the plastic frame330engage with the openings3462of the third portion346of the reflective sheet340such that the third portion346of the reflective sheet340may be fastened on the top surface332of the plastic frame330.

In this embodiment, the reflective sheet340of the plastic frame330not only adheres to the bottom334of the plastic frame330, but also adheres to the lateral side336of the plastic frame330and the top surface332of the plastic frame330. Even though the width of the plastic frame330is narrow, the reflective sheet340may be stably fixed on the plastic frame330to prevent the reflective sheet340from being detached. In addition, the openings3462of the third portion346of the reflective sheet340and the protrusions3322of the top surface332of the plastic frame330may be fastened together such that the reflective sheet340may be stably fixed with the plastic frame330.

Further, the pull-up maintaining unit300includes at least one optical film320arranged on a surface opposite to the bottom314of the light guiding plate310.

Further, the surface of the third portion346of the reflective sheet340facing toward the top surface332of the plastic frame330may be adhered to the top surface332of the plastic frame330via the adhesive technology. The adhesive technology relates to bonding two different objects with adhesive materials. The adhesive technology is not limited to a coated glue layer or adhesive double-sided adhesive.

Further, the surface of the third portion346of the reflective sheet340facing toward the top surface332of the plastic frame330may be adhered to the top surface332of the plastic frame330and the optical film320via the adhesive technology. Specifically, the surface of the third portion346of the reflective sheet340facing toward the top surface332of the plastic frame330may adhere to the top surface332of the plastic frame330and the top surface322of the optical film320via the adhesive technology. The adhesive technology relates to bonding two different objects with adhesive materials. The adhesive technology is not limited to a coated glue layer or adhesive double-sided adhesive.

It can be understood that a surface of the third portion346facing away the top surface332of the plastic frame330may be coated with an adhesive layer to adhere the protrusions3322of the top surface332of the plastic frame330to the openings3462of the third portion346of the reflective sheet340, which may prevent the reflective sheet340from being detached. Alternatively, the surface of the third portion346facing away the top surface332of the plastic frame330may be adhered with the double-sided adhesive350. In one aspect, the protrusions3322arranged on the top surface332of the plastic frame330are adhered to the openings3462of the third portion346of the reflective sheet340. In another aspect, the backlight module may be adhered to other components, such as liquid crystal panel, by another side of the double-sided adhesive350.

Further, the second portion344of the reflective sheet340is adhered to the lateral side336of the plastic frame330via the adhesive technology. The adhesive technology is not limited to a coated glue layer or adhesive double-sided adhesive.

Furthermore, the first portion342of the reflective sheet340may be adhered to the bottom314of the light guiding plate310and/or the bottom334of the plastic frame330. The adhesive technology is not limited to a coated glue layer or adhesive double-sided adhesive.

Comparing to the conventional configuration, the first portion342, the second portion344, the third portion346of the reflective sheet340adhere to the corresponding locations of the plastic frame330via the adhesive technology such that the reflective sheet340may be stably adhere to the plastic frame330, and thus the reflective sheet340is prevented from being detached even the external force is strong.

Further, the backlight module300also includes the optical film320. The third portion346of the reflective sheet340also adheres to the optical film320via adhesive technology such that the optical film320is fixed within the plastic frame330. In addition, an area where the reflective sheet340overlaps with the optical film320may reflect back the leaked light beams to enhance the light efficiency.

It can be understood that the top surface of the plastic frame may only include one protrusion, and the third portion of the reflective sheet is configured to include only one opening correspondingly.

It can be understood that the top surface of the plastic frame and the third portion of the reflective sheet may be configured to include components other than protrusion and openings. For instance, hooks and fastening hole, or other components, capable of engaging the top surface of the plastic frame and the third portion of the reflective sheet may be adopted.

In present disclosure, a LCD includes any one of the above backlight module.