CN110873922B

CN110873922B - Backlight module and display device using same

Info

Publication number: CN110873922B
Application number: CN201811001037.0A
Authority: CN
Inventors: 王琨
Original assignee: Coretronic Suzhou Corp
Current assignee: Coretronic Suzhou Corp
Priority date: 2018-08-30
Filing date: 2018-08-30
Publication date: 2022-06-07
Anticipated expiration: 2038-08-30
Also published as: TWI684800B; CN110873922A; TW202009530A

Abstract

A backlight module comprises a glass light guide plate and a frame member. The glass light guide plate is provided with a light-emitting surface, a bottom surface and a plurality of side edges, wherein the light-emitting surface is opposite to the bottom surface, and the side edges are connected with the light-emitting surface and the bottom surface. The frame is an elastic body and is provided with a bottom, a wall body part and a plurality of tops, the bottom is provided with an opening, and the wall body part is connected with the bottom and the tops and encloses an accommodating space with the bottom. The glass light guide plate is arranged in the accommodating space, and the top of the glass light guide plate covers part of the light-emitting surface. The invention further provides a display device, which comprises the backlight module and a display panel.

Description

Backlight module and display device using same

Technical Field

The present invention relates to a backlight module, and more particularly, to a backlight module including a glass light guide plate.

Background

The light guide plate for the backlight assembly may be made of a plastic material having a high transmission characteristic, such as Polymethylmethacrylate (PMMA), methyl Methacrylate Styrene (MS), or Polycarbonate (PC). However, due to the relatively weak mechanical strength of plastic, the metal or plastic back plate and the frame are also used in the backlight module, which provides support for the light guide plate structure and cushion with the peripheral components. In addition, with the progress of glass manufacturing technology, glass light guide plates with higher mechanical strength and lower thermal expansion coefficient are used to replace plastic light guide plates in backlight modules.

However, the glass light guide plate itself has sufficient rigidity, and whether to use a metal or plastic back plate is considered. In addition, in the backlight module, the assembly of the back plate, the frame member, the light guide plate and other components must be performed with a tolerance in addition to the dimensional matching, and a fixing member such as a screw is required, so that the material and the manufacturing cost are both increased in addition to the space consumption. On the other hand, the backlight module is also required to be assembled with the whole structure and the display module, and it is known that an auxiliary material is used as a buffer between the backlight module and other components.

The background section is provided to aid in understanding the present disclosure, and thus, the disclosure in the background section may include other art that does not constitute a part of the common general knowledge of the skilled person. Furthermore, the statements made in the background of the invention do not represent a reference to the above, or the problems that may be solved by one or more embodiments of the present invention, or the knowledge or knowledge of one skilled in the art before filing this application.

Disclosure of Invention

The invention provides a backlight module which has a simple structure, sufficient rigidity and functions of supporting, buffering and positioning.

The invention provides a display device which has a simplified structure and a simplified production procedure, is lighter and thinner and has low cost.

Other objects and advantages of the present invention will be further understood from the technical features disclosed in the present invention.

In order to achieve one or a part of or all of the above or other objects, the present invention provides a backlight module including a glass light guide plate and a frame member. The glass light guide plate is provided with a light-emitting surface, a bottom surface and a plurality of side edges, wherein the light-emitting surface is opposite to the bottom surface, and the side edges are connected with the light-emitting surface and the bottom surface. The frame is an elastic body and is provided with a bottom, a wall body part and a plurality of tops, the bottom is provided with an opening, and the wall body part is connected with the bottom and the tops and encloses an accommodating space with the bottom. The glass light guide plate is arranged in the accommodating space, and the top of the glass light guide plate covers part of the light-emitting surface. The invention further provides a display device, which comprises the backlight module and a display panel.

In order to achieve one or a part of or all of the above or other objects, the present invention further provides a display device, including the backlight module and the display panel.

The backlight module of the embodiment of the invention adopts the glass light guide plate, so that the backlight module has enough rigidity; the frame is an elastic body and can be in interference fit with the glass light guide plate, so that the assembly tolerance is reduced, and the consumption of materials and space is reduced. Because of the elastic body, the frame piece has the effects of buffering and shock resistance for the inside and the outside of the backlight module. The display device of the embodiment of the invention adopts the backlight module, thereby saving the use of buffering auxiliary materials, having a simplified structure and a simplified production procedure, being lighter and thinner and having lower cost.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1 is an exploded view of a backlight module according to an embodiment of the invention.

Fig. 2 is a schematic top view of a frame member according to an embodiment of the invention.

Fig. 3 is a perspective view of a frame member according to an embodiment of the invention.

Fig. 3A is an enlarged view of the region R1 in fig. 3.

Fig. 3B is an enlarged view of the region R2 in fig. 3.

Fig. 4 is a partial perspective view of the glass light guide plate disposed on the frame.

FIG. 5 is a schematic cross-sectional view of the embodiment of FIG. 1 taken along line A-A.

Fig. 6 is a perspective view of a frame member according to another embodiment of the present invention.

Fig. 6A is an enlarged view of the region R3 in fig. 6.

Fig. 6B is an enlarged view of the region R4 in fig. 6.

Fig. 7 is a schematic cross-sectional view of a backlight module according to another embodiment of the invention.

Fig. 8 is an exploded view of a backlight module according to another embodiment of the invention.

Fig. 9 is a partial perspective view of the embodiment of fig. 8.

Fig. 10 is an assembled cross-sectional view of the embodiment of fig. 8.

Fig. 11 is an exploded view of a display device according to an embodiment of the invention.

Detailed Description

The foregoing and other technical and scientific aspects, features and advantages of the present invention will be apparent from the following detailed description of a preferred embodiment, which is to be read in connection with the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting.

Fig. 1 is an exploded view of a backlight module according to an embodiment of the invention. As shown in fig. 1, the backlight module 10 includes a glass light guide plate 100 and a frame member 200. The glass light guide plate 100 has a light emitting surface 110, a bottom surface 120 and a plurality of side edges 130, wherein the light emitting surface 110 is opposite to the bottom surface 120, and the side edges 130 are connected to the light emitting surface 110 and the bottom surface 120. In addition, one of the side edges 130 is the light incident surface 130 a. The frame 200 is an elastic body, and may be an integrally formed member made of a material such as silicon rubber, etc., but is not limited thereto.

Referring to fig. 1, fig. 2, fig. 3 and fig. 3A-3B, a top view and a perspective view of the frame according to an embodiment of the invention are shown. The frame member 200 has a bottom portion 220, a wall portion 230, and a plurality of top portions 210. The bottom 220 may have an opening P, and in one embodiment, the bottom 220 of the frame member 200 is a hollow design. The wall 230 is connected to the bottom 220 and the top 210, and encloses an accommodating space S with the bottom 220 for the glass light guide plate 100 to be disposed therein. In the present embodiment, the wall 230, the bottom 220 and the top 210 are integrally formed, and the wall 230 is continuously distributed on the outer edge of the bottom 220, but not limited thereto, in an embodiment, the top 210, the wall 230 or the bottom 220 has a thickness of 0.3 to 1.1 mm. The top portions 210 are connected to the opposite sides of the wall portions 230 to the bottom portions 220, and may be contained in the receiving space S. In the present embodiment, the plurality of tops 210 are spaced apart on the wall 230, and no top 210 is disposed on a section of the wall 230.

For example, in one embodiment, the frame member 200 is quadrilateral, and has a top portion 210 on three sides of the wall portion 230. The length of the top portion 210 in the direction of the side length of the frame member 200 may be equal to or less than the side length. In addition, the top 210 may have a notch 2100. In the embodiment, the top portion 210 forms the notches 2100 at two ends, so that the middle section of the wall portion 230 is connected to the top portion 210, and the corners of the frame 200 are not distributed with the top portion 210 and have the notches 2100, but the invention is not limited thereto. In other embodiments, notch 2100 may be formed in a middle section of top portion 210.

Fig. 4 is a partial perspective view illustrating the glass light guide plate disposed on the frame. As shown in fig. 4, the wall 230 further comprises a first wall 2301 and a second wall 2302, wherein the first wall 2301 has no top 210, the second wall 2302 connects the top 210, and the top 210 forms a notch 2100 on a section of the second wall 2302 adjacent to the first wall 2301. The glass light guide plate 100 is disposed in the accommodating space S with the light incident surface 130a corresponding to the first wall 2301, wherein a gap G is formed between the light incident surface 130a and the first wall 2301. The side 130 outside the light incident surface 130a abuts against the second wall portion 2302, and the top 210 covers a part of the light emitting surface 110. In one embodiment, the glass light guide plate 100 is a quadrangle with a length and a width, which is matched with the frame member 200, but the invention does not limit the specific shape of the glass light guide plate 100.

In view of the above, the length of the side 130 of the glass light guide plate 100 perpendicular to the light incident surface 130a may be less than the length of the accommodating space S in the side direction D1, the length of the side 130 where the light incident surface 130a is located may be greater than or equal to the length of the accommodating space S in the side direction D2, and the height of the glass light guide plate 100 may be greater than or equal to the distance between the inner side of the top portion 210 and the inner side of the bottom portion 220 in the direction D3 (see fig. 3 and 3A-3B). The frame member 200 is flexible and can be stretched to fit the glass light guide plate 100 therein, thereby completing the assembly of the backlight module 10. Furthermore, the elasticity of the frame 200 and the accommodation space S thereof are matched with the size design of the glass light guide plate 100 in the directions D1, D2 and D3, so that the glass light guide plate 100 arranged therein is in interference fit with the frame 200. The top portion 210, the wall portion 230 and the bottom portion 220 sandwich the glass light guide plate 100, and the edge of the side edge 130 outside the light incident surface 130a, the bottom surface 130 and the light exit surface 110 is included, so as to form the backlight module 10 with sufficient rigidity provided by the glass light guide plate 100. The glass light guide plate 100 is made of an elastic material with the frame member 200 covering a plurality of edges (for example, edges except the light incident surface 130 a), so that the frame member 200 provides the glass light guide plate 100 with buffer protection and the backlight module 10 is a backlight module with buffer effect. When the backlight module 10 is used in, for example, a display device, it can provide backlight and has the functions of supporting and buffering. In addition, in other embodiments, the frame 200 may have other shapes, such as a ring shape, and match with the glass light guide plate 100 having a quadrilateral shape, wherein the glass light guide plate 100 is sleeved into the ring-shaped frame 200 to expand the frame 200 to have a corresponding quadrilateral shape, but the invention is not limited to the specific shape of the frame 200.

Referring to fig. 5 again, fig. 5 is a schematic sectional view of the embodiment shown in fig. 1 after combination. The backlight module 10 further includes a light source 300. In an embodiment, the light source 300 includes a circuit board 310 and a plurality of light emitting elements 320 disposed on the circuit board 310, but is not limited thereto. The light emitting device 320 is, for example, but not limited to, a light emitting diode. As shown in fig. 4-5, all or part of the light source 300 is disposed in the gap G, wherein the light emitting surface 321 faces the light incident surface 130a of the glass light guide plate 100, and the light incident surface 130a and the first wall 2301 provide a limiting function for disposing the light source 300 in the gap G. In an embodiment, the distance between the light emitting surface 321 and the light incident surface 130a is close to zero, i.e., a design without a gap, and the light source 300 can be abutted against the first wall portion 2302 through the circuit board 310. In this embodiment, the light source 300 can be tightly attached to the light-emitting surface 321 by the elasticity of the frame member 200.

Fig. 6 and fig. 6A-6B are schematic perspective views of a frame member according to another embodiment of the invention, and fig. 7 is a schematic cross-sectional view of a backlight module according to another embodiment of the invention, wherein the backlight module uses the frame member of fig. 6. As shown in fig. 6-7, the frame 200a is different from the frame 200 in that the frame 200a further includes a first position-limiting portion 251 disposed inside the wall 230. Further, the first position-limiting portion 251 is disposed at a position near two ends of the inner side of the first wall portion 2301, and when the glass light guide plate 100 is disposed in the accommodating space S, the edge of the light incident surface 130a of the glass light guide plate 100 abuts against the first position-limiting portion 251 and is separated from the first wall portion 2301 by a gap G. The first position-limiting portion 251 can be disposed inside the wall portion 230 by assembling, integral forming, etc., and the material of the first position-limiting portion is the same as or similar to the body of the frame member 200a, such as rubber, silicone, and elastic body. In addition, the distance between the first position-limiting portion 251 and the opposing (i.e., the opposing of the first wall portion 2301) second wall portion 2301 in the parallel side direction D1 may be equal to or less than the length of the side 130 of the glass light guide plate 100 perpendicular to the light incident surface 130a, so that the frame member 200a is further in interference fit with the glass light guide plate 100 and fixed to each other without the need of additional fixing members or positioning members.

As shown in fig. 6-7, the frame member 200a may further include a second limiting portion 252 disposed at a corner of the wall 230 connected to the top portion 210, and the height of the second limiting portion may exceed that of the wall 230. In one embodiment, the second position-limiting portion 252 is disposed at a corner where two ends of the first wall portion 2301 are connected to the second wall portion 2302, and may be partially located inside the wall portion 230 and overlapped with the first position-limiting portion 251 for positioning, such as an adhesive tape. In the present embodiment, the second position-limiting portion 252 can also provide good connection between the backlight module 10a and the peripheral components. Specifically, for example, in the case of a display device, the backlight module 10a provides a backlight source and has sufficient rigidity to support the display module, wherein the second position-limiting portion 252 has a positioning function for positioning the display module at a predetermined position on the backlight module 10 a. Furthermore, the backlight module 10a is surrounded by the frame member 200a, and the frame member 200a is an elastic body, thereby providing a buffering effect with respect to an outer case of the display module or device.

Fig. 8 is an exploded view of a backlight module according to yet another embodiment of the invention. The difference between the backlight module 10b shown in fig. 8 and the

backlight module

10 or 10a is that the backlight module 10b includes an optical film 400 disposed on the light-emitting surface 110 of the glass light guide plate 100. The optical film 400 may further include a prism sheet 410, a diffusion sheet 420, and the like, but is not limited thereto. Referring to fig. 9 again, in the present embodiment, the optical film 400 has the protruding lugs 430 distributed at the side of the optical film 400, and the optical film 400 is further disposed on the light emitting surface 110 without the portion covered by the top portion 210; in other words, the optical film 400 generally has a shape corresponding to a substantially exposed portion of the light emitting surface 110, but is not limited thereto. When the optical film 400 is disposed on the light emitting surface 110, the protrusion 430 protrudes to the notch 2100; in other words, the design of the notch 2100 and the location of the optical film 400 and its lug 430 can be matched with each other, but not limited thereto. In one embodiment, the optical film 400 has a plurality of lugs 430 distributed at or near corners; the corner may comprise a corner of adjacent sides, and the corner may comprise two end portions of either side. In this embodiment, as shown in FIG. 9, a plurality of lugs 430 engage with notches 2100 of frame member 200 a. The matching of the notch 2100 and the protrusion 430 can assist the arrangement and positioning of the optical film 400 on the light emitting surface 110, and limit the displacement of the optical film 400 in the directions D1 and D2.

As shown in fig. 8 and 10, the backlight module 10b further includes an adhesive tape 600. The tape 600 may include, but is not limited to, a first tape 610 and a second tape 620. In this embodiment, the first tape 610 may extend from the top surface 2301a of the first wall portion 2301 to the optical film 400, and be attached to the top surface 2301a, the light source 300 and the optical film 400, so that the optical film 400 is relatively fixed to the light source 300 and the frame member 200a, and the second tape 620 is attached to the first tape 610. In one embodiment, the adhesive tape 600 further extends along the first wall 2301 to the top surface 2301a of the second wall 2302 on two opposite sides of the frame 200a, and a notch 6000 is formed at a corner to match the second limiting portion 252 at the corner. The notch 6000 may also be used for positioning the adhesive tape 600. However, in other embodiments, an optical adhesive may be disposed between the optical film 400 and the glass light guide plate 100 for adhesion and fixation.

In this embodiment, the backlight module 10b further includes a reflective sheet 500 disposed between the bottom 220 of the frame 200a and the bottom 120 of the glass light guide plate 100, i.e. the frame 200a can hold the glass light guide plate 100 and the reflective sheet 500 at the same time, so that it is not necessary to use a fixing material such as an adhesive tape between the reflective sheet 500 and the glass light guide plate 100 or between the reflective sheet 500 and the frame 200/200a, thereby saving material consumption, reducing assembly steps and reducing manufacturing cost. In addition, the backlight module 10 may further include a reflective sheet 500 disposed between the bottom 220 of the frame 200 and the bottom 120 of the glass light guide plate 100, that is, the frame 200 also holds the glass light guide plate 100 and the reflective sheet 500.

The invention also comprises a display device 1. Fig. 11 is an assembly diagram of a display device according to an embodiment of the invention. In the embodiment of fig. 11, the display device 1 includes a backlight module 10b and a display panel 20, but the

backlight module

10 or 10a may be adopted in other embodiments. As shown in the drawings, the display panel 20 is disposed on the backlight module 10b, and in the present embodiment, the frame member 200a supports the display panel 20, but is not limited thereto. In the present embodiment, the display panel 20 is fixed adjacent to the light source 300 by the second adhesive tape 620. The side of the display panel 20 can abut against the second limiting portion 252. In one embodiment, the second position-limiting portion 252 is also higher than the display panel 20. The height difference between the second limiting portion 252 and the display panel 20 may be equal to a gap width pre-reserved between the upper portion of the outer housing of the device and the display panel 20 after the complete machine is assembled. In summary, the backlight module 10b can directly support the display panel 20, and can be connected to the elastic material lining the bottom 220 and the wall 230 of the outer housing through the frame 200a, and can be connected to the upper portion of the outer housing through the second position-limiting portion 252, wherein the second position-limiting portion 252 can also be made of elastic material. Therefore, the backlight module 10b can be used as a supporting structure and provide sufficient buffer between the internal backlight source, the upper display panel and the outer shell, and the use of a back plate, a rubber frame and a buffer auxiliary material is omitted, so that the device structure is simplified, the production procedure is simplified, and the production cost is reduced.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the invention, which is defined by the appended claims and all simple equivalent changes and modifications within the scope of the invention. Moreover, it is not necessary for any embodiment or claim of the invention to address all of the objects, advantages, or features disclosed herein. In addition, the abstract and the title of the invention are provided for assisting the retrieval of patent documents and are not intended to limit the scope of the invention. Furthermore, the terms "first", "second", and the like in the description or the claims are used only for naming elements (elements) or distinguishing different embodiments or ranges, and are not used for limiting the upper limit or the lower limit on the number of elements.

Description of the reference numerals

1: display device

10. 10a, 10 b: backlight module

20: display panel

100: glass light guide plate

110: light emitting surface

120: bottom surface

130: side edge

130 a: light incident surface

200. 200 a: frame piece

210: top part

2100: gap

220: bottom part

230: wall body part

2301: a first wall part

2301 a: top surface of the container

2302: second wall part

251; a first limit part

252: second limit part

300: light source

310: circuit board

320: light emitting element

321: luminous surface

400. 410, 420: optical film

430: convex lug

500: reflector plate

600: adhesive tape

610: first adhesive tape

620: second adhesive tape

6000: gap

P: opening of the container

S: containing space

G: gap

D1, D2, D3: and (4) direction.

Claims

1. A backlight module comprises a glass light guide plate and a frame member:

the glass light guide plate is provided with a light emitting surface, a bottom surface and a plurality of side edges, wherein the light emitting surface is opposite to the bottom surface, and the side edges are connected with the light emitting surface and the bottom surface; and

the frame piece is an elastic body and is provided with a bottom part, a wall part and a plurality of top parts, the bottom part is provided with an opening, the wall part is connected with the bottom part and the top parts and encloses an accommodating space with the bottom part, the glass light guide plate is arranged in the accommodating space, and the top parts cover the local part of the light emitting surface,

wherein the top portions are spaced apart from the wall portion and have at least one notch.

2. The backlight module according to claim 1, wherein one of the side edges is a light incident surface, a gap is formed between the wall portion and the light incident surface, and the wall portion abuts against the side edges of the glass light guide plate except the light incident surface.

3. The backlight module according to claim 2, further comprising a light source disposed in the gap.

4. The backlight module according to claim 3, wherein the frame further comprises a first position-limiting portion disposed inside the wall portion, and an edge of the light incident surface of the glass light guide plate abuts against the first position-limiting portion.

5. The backlight module as claimed in claim 1, further comprising an optical film disposed on the light-emitting surface of the glass light guide plate, wherein the optical film has a protrusion protruding into the notch.

6. The backlight module according to claim 1, further comprising a reflective sheet disposed between the bottom and the bottom surface of the glass light guide plate.

7. A display device comprises a backlight module and a display panel:

the backlight module comprises a glass light guide plate and a frame piece:

the glass light guide plate is provided with a light emitting surface, a bottom surface and a plurality of side edges, wherein the light emitting surface is opposite to the bottom surface, and the side edges are connected with the light emitting surface and the bottom surface;

the frame piece is an elastic body and is provided with a bottom, a wall part and a plurality of tops, the bottom is provided with an opening, the wall part is connected with the bottom and the tops and forms an accommodating space with the bottom in a surrounding mode, the glass light guide plate is arranged in the accommodating space, and the tops cover the local part of the light emitting surface; and

the display panel is arranged on the backlight module, the frame part supports the display panel, and the tops are distributed on the wall body part at intervals and provided with at least one notch.

8. The display device according to claim 7, wherein one of the side edges is a light incident surface, a gap is formed between the wall portion and the light incident surface, and the wall portion abuts against the side edges of the glass light guide plate except the light incident surface.

9. The display device of claim 8, further comprising a light source disposed within the gap.

10. The display device according to claim 9, wherein the frame further comprises a first position-limiting portion and a second position-limiting portion, the first position-limiting portion is disposed on an inner side of the wall portion, and an edge of the light incident surface of the glass light guide plate abuts against the first position-limiting portion; the second limiting part is arranged at one corner of the connecting side of the wall part and the top part, and the side edge of the display panel is abutted against the second limiting part.