TW201346390A - Backlight module and liquid crystal display apparatus - Google Patents

Abstract

A backlight module includes a back plate, a cushioning sleeve, and a light guide plate. A rod is disposed on the back plate. The cushioning sleeve has a first portion and a second portion, wherein the first portion has a first hole. The cushioning sleeve surrounds the rod through the first hole. A first chamfer is disposed on the boundary of the light guide plate so as to match the first portion for the positioning restriction of the light guide plate. The second portion covers part area of the boundary surrounded the first chamfer. Since not only the first portion of the cushioning sleeve fills the first chamfer, but the second portion of the cushioning sleeve covers part area of the boundary surrounded the first chamfer, the connect area between the cusps and the cushioning sleeve is large enough to prevent the prism focusing phenomenon occurred at the cusps. Therefore, light leakage from the backlight module is prevented.

Description

Backlight module and liquid crystal display device

The present invention relates to a backlight module, and more particularly to a backlight module capable of preventing light leakage and a liquid crystal display device using the same.

With the advancement of technology, liquid crystal displays have been rapidly expanded due to their characteristics of lightness, power saving, etc. However, since liquid crystal displays are non-self-luminous display devices, it is necessary to pass through the backlight module to generate display functions.

As shown in FIG. 1 , FIG. 1 is a schematic diagram of a combination of a light guide plate and a back plate in the prior art. When the light guide plate 300 is assembled, in order to position the light guide plate 300 on the back plate 100 , four are disposed on the back plate 100 . The protrusions 200 and the light guide plate 300 are correspondingly provided with four notches 400. When the light guide plate 300 is assembled on the back plate 100, the effect of positioning the light guide plate 300 is achieved by the cooperation of the protrusions 200 and the notches 400.

Since the nicks 500 are present in the gaps on the light guide plate 300, the condensing phenomenon is likely to occur at the cusps 500, resulting in light leakage of the finished backlight module. In order to solve this problem, an improvement is to cover the periphery of the light guide plate at the cusp 500 with the light-shielding tape 600 to prevent the light from collecting at the sharp point 500.

When the light-shielding tape 600 is attached, it is generally attached by hand. Since the attachment error cannot be avoided, the light-shielding tape 600 is attached to the skew; and the finger is inevitably touched by the glue layer when the tape is attached, and the glue layer is contaminated, for example. When it is stained with dust, its adhesive force will be greatly reduced, causing the light-shielding tape 600 to be attached and then lifted up. In both cases, the light-shielding effect is reduced, and the finished backlight module is leaked.

In view of the lack of the prior art, the present invention provides a backlight module that utilizes a buffer sleeve to achieve the effect of preventing light leakage.

In order to achieve the above object, a backlight module is provided in an embodiment of the present invention. The backlight module includes a back plate, a buffer sleeve and a light guide plate, wherein the back plate is provided with a stud. The buffer sleeve has a first portion and a second portion. The first portion has a first through hole, and the buffer sleeve is sleeved on the protruding post through the first through hole. A first notch is disposed on a periphery of the light guide plate. The first notch cooperates with the first portion to limit the light guide plate, and the second portion covers a portion of the peripheral portion adjacent to the first notch.

In one or more embodiments, the first portion is filled with the first gap.

In one or more embodiments, the light guide plate is provided with at least two first notches respectively disposed at opposite corners of the light guide plate; or the two first notches are disposed adjacent to the light guide plate The two sides are disposed; or the two first notches are disposed on opposite sides of the light guide plate.

In one or more embodiments, the first notch extends from the inner side of the light guide plate toward the inner side of the light guide plate.

In one or more embodiments, the first indentation is an arcuate notch, or the first indentation is a rectangular indentation.

In one or more embodiments, the first portion and the second portion of the cushion sleeve are integrally formed; or the first portion of the cushion sleeve is adhesively coupled to the second portion.

In one or more embodiments, the material of the buffer sleeve comprises silicone, rubber or foam.

In one or more embodiments, the stud is fixed to the backing plate by riveting or welding; or the stud is integrally formed with the backing plate.

In one or more embodiments, the stud is made of metal.

Another aspect of the present invention also provides a liquid crystal display device, the liquid crystal display device includes a backlight module, the backlight module includes a back plate, a buffer sleeve and a light guide plate, wherein the back plate is provided with a stud; the buffer sleeve has a The first portion has a first through hole, and the buffer sleeve is sleeved on the protruding post through the first through hole; the first gap is disposed on the periphery of the light guide plate, and the first notch cooperates with the first portion to perform the light guide plate The second portion covers the area of the portion of the circumference adjacent to the first gap.

In one or more embodiments, the first portion is filled with the first gap.

In one or more embodiments, the light guide plate is provided with at least two first notches respectively disposed at opposite corners of the light guide plate; or the two first notches are disposed adjacent to the light guide plate The two sides are disposed; or the two first notches are disposed on opposite sides of the light guide plate.

In one or more embodiments, the first notch extends from the inner side of the light guide plate toward the inner side of the light guide plate.

In one or more embodiments, the first indentation is an arcuate notch, or the first indentation is a rectangular indentation.

In one or more embodiments, the first portion and the second portion of the cushion sleeve are integrally formed; or the first portion of the cushion sleeve is adhesively coupled to the second portion.

In one or more embodiments, the material of the buffer sleeve comprises silicone, rubber or foam.

In one or more embodiments, the stud is fixed by riveting or welding The back plate; or the stud and the back plate are integrally formed.

In one or more embodiments, the stud is made of metal.

The first part of the buffer sleeve is filled with the first gap of the light guide plate, and the second portion of the buffer sleeve covers the area of the periphery of the light guide plate adjacent to the first gap, so that the contact area between the cusp of the first gap and the buffer sleeve is sufficiently large. It prevents the concentrating phenomenon at the cusp position, thereby preventing the backlight module from leaking light.

In order to further understand the objects, structures, features, and functions of the present invention, the embodiments are described in detail below.

Please refer to FIG. 2 to FIG. 3C. FIG. 2 is a schematic diagram of a liquid crystal display device according to an embodiment of the present invention. The liquid crystal display device 1 includes an iron frame 10, a liquid crystal display panel 20, and a backlight module 30. The backlight module 30 includes an optical film 31, a light guide plate 32, a buffer sleeve 33, a back plate 34, and a light-emitting diode light bar 35.

As shown in FIG. 3A, a first notch 321 is disposed on the periphery of the light guide plate 32. In the embodiment, four first notches 321 are disposed on the light guide plate 32, and are respectively located on opposite edges of the light guide plate 32. A notch 321 extends from the inner periphery of the light guide plate 32 toward the inner side of the light guide plate 32, and the first notch 321 is a rectangular notch. Each first notch 321 includes two first cusps 3211 and two second cusps 3212. As shown in FIG. 3B, the buffer sleeve 33 has a first portion 331 and a second portion 332, and the first portion 331 is provided with a first through hole 3311. The first portion 331 and the second portion 332 may be integrally formed or connected by an adhesive, and are not limited thereto. In this embodiment, the first part The 331 is T-connected to the second portion 332. Generally, the material of the buffer sleeve 33 is silicone rubber, rubber or foam. As shown in FIG. 3C, the back plate 34 is correspondingly provided with a protrusion 341. The protrusion 341 can be set to a column shape, a square shape or other shapes according to actual needs, and the shape of the first through hole 3311 is changed to ensure the buffer sleeve 33. When being sleeved on the stud 341, the first through hole 3311 and the stud 341 are engaged with each other. The stud 341 may be fixed to the back plate 34 by riveting or welding, or may be integrally formed with the back plate 34. In this embodiment, the stud 341 is cylindrical, the first through hole 3311 is a circular through hole, and the stud 341 is riveted to the back plate 34.

When assembling the backlight module 30, a light-emitting diode light bar 35 is first assembled on one side of the back plate 34, and may be attached by double-sided tape, or the light-emitting diode light bar 35 and the back plate 34 may be used. The assembly is not limited to this. Then, the buffer sleeve 33 is sleeved on the protrusion 341, the first portion 331 faces the inner side of the back plate 34, the second portion 332 is parallel to the side of the back plate 34 corresponding to the sleeve 341, and the light guide plate 32 is assembled. On the back plate 34. After the light guide plate 32 and the back plate 34 are combined, the optical film 31 is assembled on the light guide plate 32, and the assembly of the backlight module 30 is completed.

Please refer to FIG. 4A. FIG. 4A is a schematic diagram of a combination of a light guide plate and a back plate according to an embodiment of the present invention. After the light guide plate 32 is assembled on the back plate 34, the first portion 331 of the buffer sleeve 33 is filled with the first notch 321 , and the second portion 332 of the buffer sleeve 33 covers a portion of the circumference of the light guide plate 32 adjacent to the first notch 321 . The light guide plate 32 is positioned on the back plate 34 by the buffer sleeve 33 being sleeved on the protrusion 341. The buffer sleeve 33 is between the protrusion 341 and the light guide plate 32 to protect the protrusion 341 and the guide. The effect of the light panel 32. When the backlight module 30 (as shown in FIG. 2) is subjected to vibration or impact, the buffer sleeve 33 can be sucked The vibration force or the impact force is collected to prevent the protrusion 341 from directly rubbing against the light guide plate 32, so that the backlight module 30 has better durability. In addition, since the first portion 331 is filled with the first notch 321 , the second portion 332 covers a portion of the circumference of the light guide plate 32 adjacent to the first notch 321 , such that the contact area between the first cusp 3211 and the second cusp 3212 and the buffer sleeve 33 is It is large enough to prevent the condensing phenomenon at the first sharp point 3211 and the second sharp point 3212, thereby preventing the light leakage phenomenon of the backlight module 30. In order to achieve better light absorption and shading effect, in actual operation, the color of the buffer sleeve is generally selected in black.

Please return to Figure 2. After the assembly of the backlight module 30 is completed, the assembly of the liquid crystal display device 1 is started. Firstly, the liquid crystal display panel 20 is placed on the backlight module 30, and then the iron frame 10 is assembled on the liquid crystal display panel 20. The iron frame 10 and the back plate 34 are matched to each other, and the liquid crystal display panel 20 and the backlight module 30 are assembled and fixed. . The iron frame 10 and the back plate 34 can be fixed by the engagement of the hooks and the latches, or the screw holes can be arranged on the iron frame 10 and the back plate 34, and the assembly and fixing can be realized by the cooperation of the screws and the screw holes. Thus far, the assembly of the liquid crystal display device 1 is completed.

Please refer to FIG. 4B , which is a schematic diagram of a combination of a light guide plate and a back plate according to another embodiment of the present invention. The first notch 321 in FIG. 4A is a rectangular notch. As shown in FIG. 4B , the first notch 421 is a curved notch, and the first portion 431 of the buffer sleeve 43 is also arranged in an arc shape according to the shape of the first notch 421 . Thereby, mutual engagement with the first notch 421 is achieved. When the light guide plate 42 is assembled on the back plate 44, the first portion 431 is filled with the first notch 421, and the second portion 432 covers a portion of the circumference of the light guide plate 42 adjacent to the first notch 421. The buffering and light absorbing and shading functions of the buffer sleeve 43 combine with the positioning function of the stud 441 to realize positioning, protection and shading of the light guide plate 42, thereby Light leakage of the backlight module is prevented.

In actual operation, the first notch 421 can also be set to other shapes, and the shape of the first portion 431 is also changed as long as the first portion 431 can be filled to fill the first notch 421 while the second portion 432 covers the periphery of the light guide plate 42 adjacent to the first. A part of the area of the notch 421 is sufficient.

Please refer to FIG. 5 , which is a schematic diagram of a combination of a light guide plate and a back plate according to still another embodiment of the present invention. A first notch 521 is disposed on a peripheral edge of the light guide plate 52, and a protrusion 541 is disposed on the back plate 54 correspondingly. When the buffer sleeve 53 is sleeved on the boss 541, the first portion 531 faces the inner side of the back plate 54, and the second portion 532 is parallel to the circumference of the back plate 54. After the light guide plate 52 is assembled on the back plate 54, the first portion 531 and the first notch 521 are engaged with each other, and the second portion 532 covers a portion of the circumference of the light guide plate 52 adjacent to the first notch 521. The buffering and light absorbing and shading functions of the buffer sleeve 53 combine with the positioning function of the stud 541 to realize positioning, protection and shading of the light guide plate 52, thereby preventing light leakage of the backlight module.

It should be noted that the second portion 532 is not in contact with the LED strip 55, that is, a gap is required between the second portion 532 and the LED lamp 551. If the second portion 532 is in contact with the LED lamp 551, one affects the propagation of the light of the LED lamp 551, and a large amount of heat is generated when the LED lamp 551 is illuminated, and the second portion 532 is in contact with it for a long time. In contact, there is a possibility that the buffer sleeve 53 is melted, and there is a problem of reliability.

In actual operation, the shape of the first notch 521 can be set to an arc shape or other shape according to actual needs, and the shape of the first portion 531 is changed accordingly. As long as the light guide plate 52 is assembled on the back plate 54, the first portion 531 is charged. The first notch 521 is completed, and the second portion 532 covers a portion of the circumference of the light guide plate 52 adjacent to the first notch 521.

Please refer to FIG. 6. FIG. 6 is a schematic diagram showing the combination of a light guide plate and a back plate according to another embodiment of the present invention. A first notch 621 is disposed on each of the four corners of the light guide plate 62. Correspondingly, the back plate 64 is provided with a protrusion 641. In this embodiment, the first notch 621 is a rectangular notch, and the second of the buffer sleeve 63 is provided. The portion 632 is L-shaped. When the buffer sleeve 63 is sleeved on the protrusion 641, the first portion 631 faces the inner side of the back plate 64, and the two sides of the second portion 632 are respectively parallel to the two corresponding back plates 64 corresponding to the corner of the corresponding protrusion 641. side.

After the light guide plate 62 is assembled on the back plate 64, the first portion 631 and the first notch 621 are engaged with each other, and the second portion 632 covers a portion of the circumference of the light guide plate 62 adjacent to the first notch 621. The buffering and light absorbing and shading functions of the buffer sleeve 63 combine with the positioning function of the stud 641 to realize positioning, protection and shading of the light guide plate 62, thereby preventing light leakage of the backlight module.

In actual operation, the shape of the first notch 621 may be set to an arc shape or other shape according to actual needs, and the shape of the first portion 631 is changed accordingly. As long as the light guide plate 62 is assembled on the back plate 64, the first portion 631 is filled with the first portion. The notch 621 is at the same time, and the second portion 632 covers a portion of the circumference of the light guide plate 62 adjacent to the first notch 621.

The distribution of the first gaps may be distributed in other ways in addition to the above three types. For example, a first notch may be disposed on the light guide plate, and the other limiting manners may be used to achieve light shielding and positioning of the light guide plate; or a first notch may be disposed around the light guide plate, etc. limit.

The first part of the buffer sleeve is filled with the first gap of the light guide plate, and the second part of the buffer sleeve covers the periphery of the light guide plate adjacent to the light guide plate. The partial area of the first notch is such that the contact area of the cusp of the first notch and the buffer sleeve is sufficiently large to prevent the concentrating phenomenon at the cusp position, thereby preventing the backlight module from leaking light. Compared with the prior art, the defect rate is reduced, and the productivity is also improved because of the ease of assembly.

The present invention has been described by the above related embodiments, but the above embodiments are merely examples for implementing the present invention. It must be noted that the disclosed embodiments do not limit the scope of the invention. Conversely, modifications and refinements made without departing from the spirit and scope of the invention are the scope of the invention.

1‧‧‧Liquid crystal display device

10‧‧‧ iron frame

20‧‧‧LCD panel

30‧‧‧Backlight module

31‧‧‧Optical diaphragm

32, 42, 52, 62‧‧‧ light guides

33, 43, 53, 63‧‧‧ buffer sets

34, 44, 54, 64‧‧ ‧ backplane

35, 55‧‧‧Lighting diode strips

100‧‧‧ Backplane

200‧‧‧Bump

300‧‧‧Light guide plate

The first gap of 321, 421, 521, 621‧‧

331, 431, 531, 631‧‧‧ first part

332, 432, 532, 632‧‧‧ second part

341, 441, 541, 641‧‧ ‧ stud

400‧‧‧ gap

500‧‧‧ cusp

551‧‧‧Lighting diode lamp

600‧‧‧Lighting tape

3211‧‧‧ first cusp

3212‧‧‧second cusp

3311‧‧‧First through hole

1 is a schematic view showing a combination of a light guide plate and a back plate in the prior art; FIG. 2 is a schematic view showing a liquid crystal display device according to an embodiment of the present invention; and FIG. 3A is a schematic view showing a light guide plate according to an embodiment of the present invention; The figure is a schematic view of a buffer sleeve according to an embodiment of the present invention; FIG. 3C is a schematic diagram of a backboard according to an embodiment of the present invention; FIG. 4A is a schematic diagram of a combination of a light guide plate and a backboard according to an embodiment of the present invention; A schematic diagram of a combination of a light guide plate and a back plate according to another embodiment of the present invention; FIG. 5 is a schematic view showing a combination of a light guide plate and a back plate according to another embodiment of the present invention; and FIG. 6 is a light guide plate according to still another embodiment of the present invention. A schematic diagram of the combination with the backing plate.

32‧‧‧Light guide plate

33‧‧‧buffer cover

34‧‧‧ Backplane

321‧‧‧ first gap

331‧‧‧Part 1

332‧‧‧Part II

341‧‧‧Bump

3211‧‧‧ first cusp

3212‧‧‧second cusp

Claims (10)

A backlight module includes: a back plate, the back plate is provided with a protruding post; a buffer sleeve has a first portion and a second portion, the first portion has a first through hole, and the buffer sleeve passes the first a through hole is sleeved on the protruding post; and a light guide plate is disposed on the periphery of the light guide plate with a first notch, the first notch is engaged with the first portion to limit the light guide plate, and the second portion is covered The circumference is adjacent to a portion of the area of the first gap. The backlight module of claim 1, wherein the first portion fills the first gap. The backlight module of claim 1, wherein the light guide plate is provided with at least two first notches, and the two first notches are respectively disposed at opposite corners of the light guide plate; or the two first notches are disposed. The two adjacent sides of the light guide plate; or the two first notches are disposed on opposite sides of the light guide plate. The backlight module of claim 1, wherein the first notch extends from a periphery of the light guide plate toward an inner side of the light guide plate. The backlight module of claim 4, wherein the first notch is an arcuate notch, or the first notch is a rectangular notch. The backlight module of claim 1, wherein the first portion of the buffer sleeve is integrally formed with the second portion; or the first portion of the buffer sleeve is adhesively coupled to the second portion. The backlight module of claim 1, wherein the material of the buffer sleeve comprises silicone rubber, rubber or foam. The backlight module of claim 1, wherein the stud is fixed to the back plate by riveting or welding; or the stud is integrally formed with the back plate. The backlight module of claim 1, wherein the protrusion is made of metal. A liquid crystal display device comprising the backlight module of any one of claims 1 to 9.