TWM554178U - Backlight module - Google Patents

Abstract

A backlight module including a back bezel, a light guide plate, at least one light source assembly is provided. The light guide plate is disposed on the back bezel, and has at least one light emitting surface. Each light source assembly is disposed on the back bezel and adjacent to the light emitting surface. The light source assembly includes a base, a light bar, at least two locating members and at least two first locking members. The base has a bottom plate and a side plate connected to the bottom plate. The bottom plate is disposed on the back bezel. A portion of the bottom plate is covered by the light guide plate. The side plate is opposite to the light emitting surface. The light bar is disposed on the side plate. Each locating member is fixed on the bottom plate, and has a locating part and a fixing part connected to the locating part. The locating part has a locating surface opposite to the light emitting surface. The fixing part is fixed on the bottom plate. A bottom surface of the light guide plate is higher than a top surface of the locating part. An orthographic projection of the light guide plate on the bottom plate contacts the locating surface. The first locking members are configured to fix the bottom plate to the back bezel.

Description

Backlight module

The present invention relates to a light source device, and in particular to a backlight module.

The liquid crystal display panel of the liquid crystal display device does not emit light, so the surface light source needs to be provided by the backlight module. A common side-entry backlight module is a light-emitting diode light strip disposed on a light-incident surface of the light guide plate. However, although the light guide plate and the light-emitting diode light bar are all fixed on the back plate, there are still tolerances during the manufacture and assembly of the parts, so that the light-emitting surface of the light-emitting diode light bar and the corresponding light-incident surface are located. The spacing is not easy to control accurately, and it is easy to cause uneven brightness of the backlight module, which affects the image quality of the liquid crystal display device.

This "Prior Art" paragraph is only intended to aid in understanding the content of this creation, and thus the content disclosed in "Previous Technology" may contain some conventional techniques that are not known to those of ordinary skill in the art. In addition, the content disclosed in the "Prior Art" does not represent the problem to be solved by the content or one or more embodiments of the present invention, nor does it mean that it has been known to those skilled in the art prior to the present application. Know or recognize.

The present invention proposes a backlight module to improve the brightness unevenness of the conventional side-entry backlight module.

Other objects and advantages of the present work can be further understood from the technical features disclosed in the present disclosure.

In order to achieve one or a part or all of the above or other purposes, an embodiment of the present invention provides a backlight module including a back plate, a light guide plate and at least one light source assembly. The light guide plate is disposed on the back plate and has at least one light incident surface. The at least one light source component is disposed on the backplane and located adjacent to the at least one light incident surface. Each light source component includes a base, a light bar, at least two positioning components, and at least two first locking components. The base has a bottom plate and a side plate connected to the bottom plate. The bottom plate is disposed on the back plate, and a part of the bottom plate is covered by the light guide plate, and the side plate is opposite to the corresponding light incident surface. The light bar is disposed on the side panel. At least two positioning members are fixed on the bottom plate, and each positioning member has a positioning portion and a locking portion connecting the positioning portions. Each of the positioning portions is provided with a positioning surface corresponding to the light-incident surface, and each of the locking portions is locked on the bottom plate, wherein the bottom surface of the light guide plate is higher than the top surface of each positioning portion, and the orthographic projection of the light guide plate on the bottom plate contacts the positioning surface. At least two first fasteners are adapted to lock the base plate to the backing plate.

In an embodiment of the present invention, each of the positioning members further has an extension portion connecting the top surface of the positioning portion, the positioning portion and the extension portion are respectively cylindrical, and the diameter of the positioning portion is larger than the diameter of the extension portion.

In an embodiment of the present invention, the bottom plate has at least two locking holes, and the straight lines passing through the locking holes are substantially parallel to the long axis direction of the light bar, and the locking portions of the positioning members are respectively locked. In these locking holes.

In an embodiment of the present invention, the bottom plate further has at least two openings, and the first locking members are respectively fixed through the openings to the back plate, and the first locking heads of the first locking members are respectively Close to the bottom plate.

In an embodiment of the present invention, each of the light source assemblies further includes at least one second locking member, and the bottom plate has at least one opening corresponding to the at least one second locking member, and the strip opening is located at the light guide plate and the back plate Between the strip openings, extending from one end of the side panel toward the side panel, the second fasteners are locked to the back panel through the corresponding strip openings, and the second lock of each second lock There is a gap between the solid head and the bottom plate.

In an embodiment of the present invention, the gap between the second locking head of the second fastener and the bottom plate is between 0.2 and 0.4 mm.

In an embodiment of the present invention, the back plate has at least one pair of protruding portions, and the bottom plate has at least one pair of opening holes corresponding to at least one pair of protruding portions, and the extending direction of each of the opposing openings and each strip The openings extend in the same direction.

In an embodiment of the present invention, the base is a heat dissipation base.

In an embodiment of the present invention, the backplane is a heat dissipation backplane.

In an embodiment of the present invention, the light guide plate has two light incident surfaces opposite to each other, and the backlight module has two light source assemblies disposed adjacent to the light incident surfaces.

The backlight module of the present embodiment has at least two positioning members on the bottom plate of the base, and the positioning surface of each positioning member corresponds to the light incident surface of the light guide plate, and the locking portion of the positioning member is half-locked to the bottom plate. The movable base supports the positioning surfaces against the light guide plate to complete the positioning of the base. After that, the bottom plate is locked on the back plate by the first locking member, so that the relative position between the light bar and the light incident surface of the light guide plate can be accurately fixed to improve the brightness of the conventional side-entry backlight module. The problem of unevenness. In addition, after the first lock body locks the bottom plate on the back plate, the locking portion of the positioning member can be locked downward, and the bottom surface of the light guide plate is higher than the top surface of the positioning portion, so that the light guide plate can be avoided. The positioning portion is pushed by thermal expansion.

The above and other objects, features and advantages of the present invention will become more apparent and understood.

The above and other technical contents, features and effects of the present invention will be apparent from the following detailed description of the preferred embodiments. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., refer only to the additional drawing directions. Therefore, the directional terminology used is used to illustrate that it is not intended to limit the creation.

1 is a top plan view of a backlight module according to an embodiment of the present invention, and FIG. 2 is a side view of the backlight module of FIG. Referring to FIG. 1 and FIG. 2 , the backlight module 1 of the embodiment includes a back plate 10 , a light guide plate 20 , and at least one light source assembly 30 . The light guide plate 20 is disposed on the back plate 10 and has at least one light incident surface 21 . The number of the light incident surfaces 21 corresponds to the number of the light source components 30. This embodiment is an example of a light source assembly 30 and a light incident surface 21. The light source assembly 30 is disposed on the back plate 10 and is located beside the light incident surface 21.

The backplane 10 is configured to carry the light guide plate 20 and the light source assembly 30. The backplane 10 is, for example, a heat dissipation backplane, and is suitable for dissipating heat from the light source assembly 30. The material of the back sheet 10 is, for example, aluminum or another metal material having better thermal conductivity. Further, the light guide plate 20 is, for example, a square plate-like body having four side faces, and the light incident surface 21 is one of the side faces.

The light source assembly 30 includes a base 31, a light bar 32, at least two positioning members 33, and at least two first locking members 34. The present embodiment is exemplified by two positioning members 33 and two first locking members 34.

FIG. 3 is a schematic diagram of a light bar of a backlight module according to an embodiment of the present invention combined with a base. Referring to FIG. 1 and FIG. 3 , the base 31 has a bottom plate 311 and a side plate 312 connecting the bottom plate 311 , and the light bar 32 is disposed on the side plate 312 . The side panels 312 are, for example, perpendicular to the bottom panel 311. In other embodiments, the side panels 312 can also be inclined relative to the bottom panel 311. The bottom plate 311 is disposed on the back plate 10, and the partial bottom plate 311 is covered by the light guide plate 20, and the side plate 312 is opposite to the corresponding light incident surface 21. The material of the base 31 includes, for example, aluminum, and the heat energy generated by the light bar 32 can be transmitted to the back plate 10 for heat dissipation.

The light bar 32 includes, for example, a substrate 321 and a plurality of light emitting elements 322 disposed on the substrate 321 . Each of the light-emitting elements 322 is, for example, a light-emitting diode or another type of semiconductor light-emitting element, but is not limited thereto.

The positioning member 33 is fixed to the bottom plate 311 , and each positioning member 33 has a positioning portion 331 and a locking portion 332 connecting the positioning portion 331 . Each of the positioning portions 331 is provided with a positioning surface 333 corresponding to the light-incident surface 21, and each of the locking portions 332 is locked to the bottom plate 311. The bottom surface 23 of the light guide plate 20 is higher than the top surface 334 of each positioning portion 331 (as shown in FIG. 2). And the front projection of the light guide plate 20 on the bottom plate 311 contacts the positioning surface 333. Specifically, as shown in FIG. 3, the bottom plate 311 has, for example, at least two locking holes 313, and the straight line L passing through the locking holes 313 is substantially parallel to the longitudinal direction A1 of the light bar 32. The locking portions 332 of the positioning members 33 shown in FIG. 1 and FIG. 2 are respectively locked in the locking holes 313. In this embodiment, two locking holes 313 are taken as an example, and the locking holes 313 are respectively located on the side of the light bar 32.

The first locking member 34 is adapted to lock the bottom plate 311 to the backing plate 10. Specifically, as shown in FIG. 1 and FIG. 3, the bottom plate 311 has, for example, at least two openings 314, and the number of the openings 314 corresponds to the number of the first locks 34. These openings 314 are respectively disposed, for example, beside the above-described locking holes 313. Each of the first locking members 34 is locked to the back plate 10 through the corresponding opening 314 , and the first locking head 341 of each of the first locking members 34 abuts against the bottom plate 311 . In addition, the diameter of the opening 314 is larger than the diameter of the rod portion (not shown) of the first locking member 34 to ensure that the rod portion of the first locking member 34 can smoothly pass through the opening 314 after the position of the base 31 is finely adjusted. The locking hole (not shown) of the back plate 10 is locked, and after the first locking member 34 is locked to the back plate 10, the base is fixed by the first locking head 341 pressing against the bottom plate 311. 31.

The process of fixing the light source assembly 30 of the backlight module 1 of the present embodiment to the backing plate 10 will be described below with reference to the drawings. 4 is a side elevational view of the light source assembly of FIG. 1 being secured to the backing plate. Referring to FIG. 1 and FIG. 4 , when the backlight module 1 of the embodiment is assembled, the light guide plate 20 is fixed on the back plate 10 , and at least one of the light guide plate 20 and the back plate 10 can be provided with a positioning mechanism. (not shown) to accurately fix the light guide plate 20 to the back plate 10. On the other hand, the light bar 32 is first fixed to the side plate 312 of the base 31, and the locking portion 332 of each positioning member 33 is first half-locked (ie, in an unlocked state) on the bottom plate 311. After the pedestal 31 is placed on the backplane 10, the pedestal 31 can be moved to support the locating surface 333 of each locating member 33 against the light guide plate 20, so that there is a preset between the illuminating surface E and the light incident surface 21. The spacing D1. Then, the bottom plate 311 is locked on the back plate 10 by the first locking member 34, so that the accurate distance D1 between the light-emitting surface E and the light-incident surface 21 can be maintained, thereby improving the conventional side-entry backlight module. The problem of uneven brightness. In the design, the locking position of each positioning member 33 on the bottom plate 311 (ie, the position of the locking hole 313) and the size of each positioning member 33 (for example, the width in the normal direction of the light incident surface 21) can be comprehensively considered. When a positioning surface 333 of each positioning member 33 is supported by the light guide plate 20, a predetermined distance D1 between the light-emitting surface E and the light-incident surface 21 is obtained.

Then, as shown in FIG. 2, the locking portion 332 of each positioning member 33 is locked downward. At this time, the bottom surface 23 of the light guide plate 20 is higher than the top surface 334 of each positioning portion 331, so that the positioning portions 331 and The light guide plates 20 are separated from each other, and the orthographic projection of the light guide plate 20 on the bottom plate 311 contacts the positioning surface 333. When the locking portion 332 is locked, the positioning portion 331 and the light guide plate 20 are separated from each other, so that the light guide plate 20 can be prevented from being pushed by the positioning portion 331 due to thermal expansion.

It should be noted that each positioning member 33 can further have an extending portion 335 connecting the top surface 334 of the positioning portion 331 . The positioning portion 331 and the extending portion 335 are respectively cylindrical, and the diameter R1 of the positioning portion 331 is larger than the extending portion 335 . The diameter of R2. The extending portion 335 can limit the degree of expansion of the light guide plate 20 and serve as a safety surface when the light guide plate 20 is hot melted.

FIG. 5 is a schematic view showing the second lock of the backlight module of the embodiment of the present invention for locking the bottom plate to the back plate. Referring to FIG. 1 and FIG. 5, the light source assembly 30 can further include at least one second locking member 35. This embodiment takes one example as an example. When the light guide plate 20 has not been fixed to the back plate 10, the base 31 may be first placed on the back plate 10, and the bottom plate 311 of the base 31 is first locked on the back plate 10 by the second lock 35. In order to restrict the base 31 from moving only in one axial direction A2, the distance between the light-emitting surface E of the light bar 32 and the light-incident surface 21 of the light guide plate 20 can be adjusted. Thereafter, the light guide plate 20 is fixed to the back plate 10.

Specifically, the bottom plate 311 has at least one opening 315 corresponding to the at least one second locking member 35. After the light guide plate 20 is fixed to the back plate 10, the strip opening 315 is located between the light guide plate 20 and the back plate 10, and the strip opening 315 extends from one end of the side plate 312 toward the side away from the side plate 312, for example, Extending along the axial direction A2. The second locking member 35 is locked to the back plate 10 through the corresponding strip opening 315, and there is a gap D2 between the second locking head 351 of the second locking member 35 and the bottom plate 311, so the bottom plate of the base 31 The 311 can still move along the strip opening 315 (ie, move along the axial direction A2) so that the positioning faces 333 of the positioning members 33 are both supported by the light guide plate 20. Further, the gap D2 between the second lock head 351 and the bottom plate 311 is, for example, 0.2 to 0.4 mm, and the above parameter range is not limited thereto.

FIG. 6 is a schematic diagram of a combination of a backplane and a pedestal of a backlight module according to an embodiment of the present invention. Referring to FIG. 6 , the back plate 10 may have at least one pair of positioning protrusions 25 , and the bottom plate 311 may have at least one pair of positioning holes 316 corresponding to at least one pair of positioning protrusions 25 , which is a two-position convex part in this embodiment. 25 and two alignment openings 316 are taken as examples. The extending direction of each of the alignment openings 316 is the same as the extending direction of each of the strip openings 315, for example, extending along the axial direction A2. When the susceptor 31 is placed on the backing plate 10, the alignment protrusion 25 and the alignment opening 316 may be firstly aligned to improve the assembly efficiency.

Although the backlight module has a light source component as an example in the above embodiment, in other embodiments, the backlight module may have multiple light source components. FIG. 7 is a schematic diagram of a backlight module according to another embodiment of the present invention. As shown in FIG. 7 , the backlight module 1 a of the present embodiment is similar to the backlight module 1 described above. The main difference is that the backlight module 1 a has two light source assemblies 30 , respectively disposed on the light guide plate 20 . Beside the glossy side 21.

In summary, the backlight module of the present embodiment has at least two positioning members on the bottom plate of the base, and the positioning surface of each positioning member corresponds to the light incident surface of the light guide plate, and the locking portion of the positioning member is When the semi-locking is fixed to the bottom plate, the movable base supports the positioning faces against the light guide plate to complete the positioning of the base. After that, the bottom plate is locked on the back plate by the first locking member, so that the relative position between the light bar and the light incident surface of the light guide plate can be accurately fixed to improve the brightness of the conventional side-entry backlight module. The problem of unevenness. In addition, after the first lock body locks the bottom plate on the back plate, the locking portion lock of the positioning member can be locked downward, and the bottom surface of the light guide plate is higher than the top surface of the positioning portion, so that the light guide plate can be avoided. The positioning portion is pushed due to thermal expansion.

However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention cannot be limited by this, that is, the simple equivalent change and modification made by the applicant according to the scope of the patent application and the new description content, All are still covered by this creation patent. In addition, any embodiment or application of the present invention is not required to achieve all of the objects or advantages or features disclosed in the present disclosure. In addition, the abstract sections and headings are only used to assist in the search for patent documents and are not intended to limit the scope of the invention. In addition, the terms "first" and "second" as used in the specification or the scope of the patent application are used only to name the elements or to distinguish different embodiments or ranges, and are not intended to limit the number of elements. Upper or lower limit.

1, 1a‧‧‧ backlight module
10‧‧‧ Backboard
20‧‧‧Light guide
21‧‧‧Into the glossy surface
23‧‧‧ bottom
25‧‧‧ alignment convex
30‧‧‧Light source components
31‧‧‧ Pedestal
311‧‧‧floor
312‧‧‧ side panels
313‧‧‧Lock hole
314‧‧‧ openings
315‧‧‧ strip openings
316‧‧‧ alignment opening
32‧‧‧Light strips
321‧‧‧Substrate
322‧‧‧Lighting elements
33‧‧‧ Positioning parts
331‧‧‧ Positioning Department
332‧‧‧Locking
333‧‧‧ positioning surface
334‧‧‧ top surface
335‧‧‧Extension
34‧‧‧First lock firmware
341‧‧‧First lock head
35‧‧‧Second lock firmware
351‧‧‧Second lock head
A1‧‧‧ long axis direction
A2‧‧‧Axial
D1‧‧‧ spacing
D2‧‧‧ gap
E‧‧‧Lighting surface
L‧‧‧ Straight line
R1, R2‧‧‧ diameter

1 is a top plan view of a backlight module according to an embodiment of the present invention. 2 is a side elevational view of the backlight module of FIG. 1. FIG. 3 is a schematic diagram of a light bar of a backlight module according to an embodiment of the present invention combined with a base. 4 is a side elevational view of the light source assembly of FIG. 1 being secured to the backing plate. FIG. 5 is a schematic view showing the second lock of the backlight module of the embodiment of the present invention for locking the bottom plate to the back plate. FIG. 6 is a schematic diagram of a combination of a backplane and a pedestal of a backlight module according to an embodiment of the present invention. FIG. 7 is a schematic diagram of a backlight module according to another embodiment of the present invention.

1‧‧‧Backlight module

10‧‧‧ Backboard

20‧‧‧Light guide

21‧‧‧Into the glossy surface

30‧‧‧Light source components

31‧‧‧ Pedestal

311‧‧‧floor

312‧‧‧ side panels

314‧‧‧ openings

315‧‧‧ strip openings

32‧‧‧Light strips

321‧‧‧Substrate

322‧‧‧Lighting elements

33‧‧‧ Positioning parts

331‧‧‧ Positioning Department

333‧‧‧ positioning surface

335‧‧‧Extension

34‧‧‧First lock firmware

341‧‧‧First lock head

35‧‧‧Second lock firmware

351‧‧‧Second lock head

D1‧‧‧ gap

E‧‧‧Lighting surface

A2‧‧‧Axial

Claims (10)

A backlight module includes: a backplane; a light guide plate disposed on the backplane and having at least one light incident surface; and at least one light source component disposed on the backplane and located at the at least one light incident The side light source assembly includes: a base having a bottom plate and a side plate connected to the bottom plate, wherein the bottom plate is disposed on the back plate, and the bottom plate is covered by the light guide plate, and the side plate and the corresponding light entering the light a light bar disposed on the side plate; at least two positioning members fixed on the bottom plate, each of the positioning members has a positioning portion and a locking portion connected to the positioning portion, and each of the positioning portions corresponds to The light surface is provided with a positioning surface, and each of the locking portions is locked on the bottom plate, wherein a bottom surface of the light guide plate is higher than a top surface of each of the positioning portions, and an orthographic projection of the light guide plate on the bottom plate contacts the positioning surface And at least two first locks adapted to lock the bottom plate to the backboard. The backlight module of claim 1, wherein each of the positioning members further has an extension portion connecting the top surface of the positioning portion, the positioning portion and the extending portion are respectively cylindrical, and the positioning portion is respectively The diameter is larger than the diameter of the extension. The backlight module of claim 1, wherein the bottom plate has at least two locking holes, and a straight line passing through the locking holes is substantially parallel to a long axis direction of the light bar, and the positioning The locking portions of the piece are respectively locked in the locking holes. The backlight module of claim 3, wherein the bottom plate further has at least two openings, and the first locking members respectively pass through the openings to be locked on the back plate, and each of the first A first locking head of a locking fastener abuts the bottom plate. The backlight module of claim 1, wherein each of the light source assemblies further comprises at least one second locking member, and the bottom plate has at least one opening corresponding to the at least one second locking member, the strip An opening is located between the light guide plate and the back plate, and each of the strip openings extends from an end of the side plate toward the side plate, and each of the second fasteners is locked through the corresponding strip opening. The back plate is fixed, and a gap is formed between a second locking head of each of the second fasteners and the bottom plate. The backlight module of claim 5, wherein the gap between the second locking head of the second fastener and the bottom plate is between 0.2 and 0.4 mm. The backlight module of claim 5, wherein the back plate has at least one pair of protrusions, the bottom plate having at least one pair of position openings corresponding to at least one pair of protrusions, each of the positions being open The extending direction of the holes is the same as the extending direction of each of the strip-shaped openings. The backlight module of claim 1, wherein the base is a heat dissipation base. The backlight module of claim 1, wherein the backplane is a heat dissipation backplane. The backlight module of claim 1, wherein the light guide plate has two light incident surfaces opposite to each other, and the backlight module has two light source assemblies disposed adjacent to the light incident surfaces.