Back light module and liquid crystal display device using the same

The present invention discloses a backlight module and a LCD using the same. Said backlight module comprises a light guide plate, a reflection sheet and a backplane, wherein said reflection sheet is arranged under the light guide plate; said backplane is arranged under the reflection sheet and partially supports the reflection sheet; and said reflection sheet is bent to form one or more supporting ribs for supporting the backplane to prevent the reflection sheet from drooping. The present invention solves the problem that the reflection sheet is affected by heat and then is easy to droop, by bending the reflection sheet of the backlight module to form the one or more supporting ribs for supporting the reflection sheet, and has the advantages of low cost and no negative influence on other components and system structure of the backlight module.

TECHNICAL FIELD

The present invention relates a light emitting module for electronic products, particularly to a backlight module and a liquid crystal display (LCD) using the same.

BACKGROUND

At present, LCDs as the display components of electronic devices are widely used in various electronic products, and the backlight module is one of the essential components of the LCDs. As shown inFIG. 1, the existing LCD10comprises a frame12, a LCD panel14assembled on the frame12, and a backlight module16; wherein the backlight module16comprises an optical diaphragm161, a light guide plate162, a lamp tube163, a reflection sheet164and a backplane165. The light guide plate162is arranged under the optical diaphragm162in a stacked mode; the lamp tube163is arranged on one side of the light guide plates162; the reflection sheet164is arranged under the light guide plate162in a stacked mode; the backplane165is arranged under the reflection sheet164; and the backplane165is in the structure of a buckle plate in accordance with the design requirements of the structure and function of the backlight module16, and is partially in contact with the reflection sheet164to support the reflection sheet164. Wherein, the reflection sheet164is used for reflecting the light emitted by the lamp tube163to the light guide plates163. However, the reflection sheet164is easily affected by heat and then is softened to cause a large droop, particularly in the position close to a heat source, such as light beams, etc. The common solutions include adding reinforcing ribs166in the space between the reflection sheet164and the backplane165, and the reflection sheet164is supported by the reinforcing ribs166(as shown inFIG. 1); or supporting bumps167are arranged on the backplane165(as shown inFIG. 2); or strips of adhesive tapes are applied on the bottom surface of the reflection sheet164(not shown in the figure). However, the addition of the reinforcing ribs166will obviously increase the cost of both the parts and the die, and also will increase the weight of the overall backlight module16; the supporting bumps167will make the backplane become more complex, and increase the possibility of warp, and may cause other structural problems; the adhesive tape will increase the cost and bring trouble to the overall performance.

SUMMARY

In view of the above, the present invention aims to provide a backlight module which effectively prevents the reflection sheet from drooping and is also of low cost and simple structure.

In order to solve the above technical problems, the present invention provides a backlight module, and the backlight module comprises a light guide plate, a reflection sheet and a backplane, wherein the reflection sheet is arranged under the light guide plate; the backplane is arranged under the reflection sheet and partially supports the reflection sheet; and the reflection sheet is bent to form one or more supporting ribs for supporting the backplane to prevent the reflection sheet from drooping.

Wherein, the one or more supporting ribs are formed by bending the end of the reflection sheet and is positioned in the space between the reflection sheet and the backplane, and the end of the one or more supporting ribs are abutted by the backplane.

The cross sections of the one or more supporting ribs are of triangular shape, and the one or more supporting ribs with triangular cross sections have the advantages of stable support and simple structure.

Wherein, the reflection sheet comprises multiple supporting ribs formed by bending one end of the reflection sheet, and the supporting ribs support different sections of the reflection sheet.

Wherein, the one or more supporting ribs form an end section for abutting with the backplane in parallel to achieve surface contact.

Wherein, contact included angle between the one or more supporting ribs and the reflection sheet is 90°. Such design provides better support for the reflection sheet.

Wherein, a cut mark line is formed at the upper bending position of the reflection sheet.

Wherein, the reflection sheet is pasted with a double sided adhesive tape for bonding the reflection sheet to the light guide plate.

Wherein, the backplane is in the structure of a bent buckle plate, and comprises multiple high sections and multiple low sections, wherein the high sections are abutted by the reflection sheet to support the reflection sheet; and a space is formed between the low sections and the reflection sheet.

In addition, the present invention provides a LCD using the backlight module.

A LCD comprises any of the above backlight modules.

The present invention solves the problem in the prior art that the reflection sheet is affected by heat and then is easy to droop, by bending the reflection sheet of the backlight module to form the one or more supporting ribs for supporting the reflection sheet, and has the advantages of low cost, simple structure and has no negative influence on other components and the system structure of the backlight module.

DETAILED DESCRIPTION

In order to describe the technical content, the structural feature, the purpose and the effect of the present invention, the invention will further be described in detail in accordance with its preferred embodiments and the figures.

As shown inFIG. 3, the LCD20of a first preferred embodiment of the present invention comprises a frame22, a LCD panel24assembled on the frame22, and a backlight module26, wherein the backlight module26comprises an optical diaphragm261, a light guide plate262, a lamp tube263, a reflection sheet264and a backplane265.

The light guide plate262is arranged under the optical diaphragm261in a stacked mode and plays a role of guiding light; the lamp tube263is arranged on one side of the light guide plate262and is used as the light source of the backlight module20; and the reflection sheet264is arranged under the light guide plate262and is used for reflecting the light emitted by the lamp tube263to the light guide plate262. The reflection sheet264can be made of one or multiple materials of PC, ABS/PMMA, MS, PE, PS, PP and PVC. The reflection sheet264forms a supporting rib2642. The supporting rib2642is formed by bending one end of the reflection sheet264, and is positioned in the space2656formed by the reflection sheet264and the backplane265. One end of the supporting rib2642is abutted by the backplane265to support the reflection sheet264. Preferably, the cross section of the supporting rib is of a triangular shape, and the supporting rib with a triangular cross section has the advantages of stable support and simple structure. The contact included angle between the supporting rib and the reflection sheet is 90°, namely the triangle is a right triangle, to better support the reflection sheet.

The specific process for forming the supporting rib2642can comprise: setting the bending position in accordance with the existing suspending environment of the reflection sheet264; cutting to form a cut mark line in the bending position of the reflection sheet264(not shown in the figure); bending the reflection sheet264downwards in accordance with the cut mark line to form the supporting rib2642. The reflection sheet264can be pasted with a double sided adhesive tape2644for bonding the reflection sheet264to the light guide plate262. In the first preferred embodiment, the double sided adhesive tape2644is arranged at one end adjacent to the supporting rib2642.

The backplane265is arranged under the reflection sheet264and is in the structure of a bent buckle plate to meet the design requirements of the structure and function of the backlight module26. The backplane265comprises multiple high sections2652and multiple low sections2654, wherein the high sections2652are in contact with the reflection sheet264to support the reflection sheet264; and a space2656is formed between the low sections2654and the reflection sheet264.

The present invention solves the problem that the reflection sheet264is affected by heat and then is easy to droop, by bending the reflection sheet264of the backlight module26of the LCD20to form the supporting rib2642for supporting the reflection sheet264, and has the advantages of low design cost, simple structure and no negative influence on other components and the system structure of the backlight module26.

As shown inFIG. 4, the structure of the LCD30of a second preferred embodiment of the present invention is nearly the same as that of the LCD20of the first preferred embodiment, and the structure of the LCD30is different from the structure of the LCD20in the mode that multiple drooping sections may be formed because the reflection sheet364has different section differences, and one end of the reflection sheet364of the backlight module of the second preferred embodiment is bent to form multiple supporting ribs3642to support different sections of the reflection sheet364. The supporting ribs3642are also formed by repeatedly bending one end of the reflection sheet364, and the supporting ribs3642support different sections of the reflection sheet364as required. The section of the reflection sheet364in contact with the light guide plate362is also bonded by the double sided adhesive tape3644.

As shown inFIG. 5, the structure of the LCD40of a third preferred embodiment of the present invention is nearly the same as that of the LCD20of the first preferred embodiment, and the structure of the LCD40is different from the structure of the LCD20in the mode that the reflection sheet464of the backlight module46comprises a supporting rib4642, and the supporting rib forms an end section4644abutted by the backplane465in parallel, to keep the stability of the supporting rib4642for supporting the reflection sheet464better. The contact included angle between the supporting rib and the reflection sheet can also be 90°, to better support the reflection sheet. In addition, all components of the backlight module46of the LCD40are fixed by the assembly frame42. The assembly frame42, the peripheral frame43and the LCD panel44are assembled to form the LCD40. In addition, the partial contact surface of the assembly frame42is bonded to the partial contact surface of the peripheral frame43by the double sided adhesive tape45.

In summary, the present invention solves the problem that the reflection sheet is affected by heat and then is easy to droop, by setting the bending position on the reflection sheet of the backlight module of the LCD of the present invention in accordance with the existing suspending environment, cutting to form a cut mark line in the bending position of the reflection sheet, bending the reflection sheet in accordance with the cut mark line to form the one or more supporting ribs, pasting a double sided adhesive tape in the position of the reflection sheet to be fixed to bond to the light guide plate, and fully supporting the reflection sheet by the one or more supporting ribs to prevent the reflection sheet from drooping, and has the advantages of low design cost, simple structure and no negative influence on other components and the system structure of the backlight module.

The present invention is only described in accordance with the above specific preferred embodiments. However, this invention is not limited to the specific embodiments. All the equivalent structures or equivalent processes changed according to the specification and figure contents of the present invention or directly or indirectly used in other related technical fields should belong to the protection scope of the patent of the present invention.