TWI684800B - Backlight module and display device using the same - Google Patents

Abstract

A backlight module comprising a glass light guide plate and a frame. The glass light guide plate has a light-exiting surface, a bottom surface and a plurality of edges, wherein the light-exiting surface is opposite to the bottom surface, the edges are connected to the light-exiting surface and the bottom surface. The frame has resilience and has a bottom portion, a wall portion and a plurality of top portion, wherein the bottom portion has an opening; the wall portion is connected to the bottom portion and the top portion, and encloses an accommodation space with the bottom portion. The glass light guide plate is disposed in the accommodation space with the top portion of the frame covering a portion of the light-exiting surface. The present invention further provides a display device which comprises the backlight module described above and a display panel.

Description

Backlight module and display device using the same

The invention relates to a backlight module, in particular to a backlight module including a glass light guide plate.

The light guide plate used for the backlight module may be made of a plastic material with high transmission characteristics, such as polymethyl methacrylate (PMMA), methyl methacrylate styrene (MS) or polycarbonate (PC). However, due to the relatively weak mechanical strength of plastic, metal or plastic backplanes and frames are also used in backlight modules to provide light guide plate structural support and cushioning with peripheral components. In addition, with the advancement of glass manufacturing technology, glass light guide plates with higher mechanical strength and lower coefficient of thermal expansion are more often used in backlight modules instead of plastic light guide plates.

Although the glass light guide plate itself has sufficient rigidity, whether to use metal or plastic backplane remains to be considered. In addition, the assembly of the backplane, frame, light guide plate and other components in the backlight module must be toleranced in addition to the size, and the use of fixing parts such as screws is required. Therefore, in addition to space consumption, materials and Manufacturing also constitutes production costs. On the other hand, the backlight module must also be assembled with the complete machine structure and display module. It is known that auxiliary materials will be used as a buffer between the backlight module and other components.

This "prior art" paragraph is only used to help understand the content of the present invention. Therefore, the content disclosed in the "prior art" may include some conventional technologies 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 content or the problem to be solved by one or more embodiments of the present invention, nor does it mean that those who have general knowledge in the technical field before the application of the present invention Know or know.

The invention provides a backlight module with a simplified structure and sufficient rigidity, as well as supporting, buffering and positioning functions.

The invention provides a display device with a simplified structure and a simplified production process, which is lighter, thinner, and lower in cost.

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

In order to achieve one, part, all, or other objectives, the backlight module provided by the present invention includes a glass light guide plate and a frame. The glass light guide plate has a light exit surface, a bottom surface, and a plurality of side edges. The light exit surface is opposed to the bottom surface, and the side edges are connected to the light exit surface and the bottom surface. The frame member is an elastic body, and has a bottom, a wall portion and a plurality of tops. The bottom has an opening, the wall portion connects the bottom and the top, and forms a containing space with the bottom. The glass light guide plate is arranged in the accommodating space, and the top part of the light-emitting surface is covered. The present invention also provides a display device including the above backlight module and a display panel.

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

The backlight module of the embodiment of the present invention has sufficient rigidity due to the use of a glass light guide plate; the frame member is an elastic body and can have an interference fit with the glass light guide plate, thus reducing the situation of assembly tolerance and reducing materials and Space consumption. Because it is an elastomer, the frame has buffering and shockproof effects on the inside and outside of the backlight module. The display device of the embodiment of the present invention uses the aforementioned backlight module, so the use of buffer auxiliary materials is eliminated, the structure is simplified, and the production process is simplified, which is lighter, thinner, and lower in cost.

In order to make the above and other objects, features, and advantages of the present invention more comprehensible, preferred embodiments are described below in conjunction with the accompanying drawings, which are described in detail below.

The foregoing and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description with reference to one of the preferred embodiments of the drawings. The direction words mentioned in the following embodiments, for example: up, down, left, right, front or back, etc., are only for the directions referring to the attached drawings. Therefore, the directional terminology is used to illustrate rather than limit the invention.

FIG. 1 is an exploded schematic 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 200. The glass light guide plate 100 has a light exit surface 110, a bottom surface 120, and a plurality of side edges 130. The light exit surface 110 is opposite to the bottom surface 120, and the side edges 130 are connected to the light exit surface 110 and the bottom surface 120. In addition, one of the sides 130 is a light incident surface 130a. The frame member 200 is an elastic body, and may be an integrally formed piece made of silicone, rubber, or other materials, but is not limited thereto.

Referring again to FIG. 1, FIG. 2, FIG. 3, and FIGS. 3A-3B, a top schematic view and a stereo schematic view of a frame member of an embodiment of the present invention. 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 200 is of hollow design. The wall portion 230 is connected to the bottom 220 and the top 210, and surrounds the bottom 220 to form an accommodating space S for the glass light guide plate 100 to be disposed therein. In this embodiment, the wall portion 230, the bottom portion 220 and the top portion 210 are integrally formed, and the wall portion 230 is continuously distributed on the outer edge of the bottom portion 220, but it is not limited to this. In one embodiment, the top portion 210. The wall portion 230 or the bottom 220 has a thickness of 0.3 to 1.1 mm. The plurality of tops 210 are connected to the side opposite to the connection side of the wall part 230 and the bottom 220, and may be included in the accommodating space S. In this embodiment, the plurality of tops 210 are distributed on the wall portion 230 at intervals, and there is no top 210 on a section of the wall portion 230.

For example, in one embodiment, the frame 200 is a quadrilateral, and the wall portion 230 on three sides has a top 210. The length of the top 210 in the length direction of the side of the frame member 200 may be less than or equal to the length of the side. In addition, the top 210 may have a notch 2100. In this embodiment, the top 210 is formed with notches 2100 at both ends, so that the wall portion 230 can assume a shape in which the top 210 is connected to the middle section, and the corners of the frame 200 can be present without the distribution of the top 210 and have a notch The shape of 2100 is not limited to this. In other embodiments, the notch 2100 may be formed in the middle portion of the top 210.

4 is a partial perspective view of a glass light guide plate disposed on a frame. As shown in FIG. 4, the wall portion 230 further includes a first wall portion 2301 and a second wall portion 2302, wherein the first wall portion 2301 has no top 210, and the second wall portion 2302 is connected to the top 210, and The top 210 forms a notch 2100 in a section of the second wall portion 2302 adjacent to the first wall portion 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 portion 2301, wherein the light incident surface 130a is separated from the first wall portion 2301 by a gap G. The side 130 other than the light incident surface 130a is in contact with 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 matched with the frame member 200 and has a long and wide quadrilateral, but the present invention does not limit the specific shape of the glass light guide plate 100.

According to 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, and the length of the side 130 where the light incident surface 130a is located may be It is greater than or equal to the length of the accommodating space S in the lateral direction D2, and the height of the glass light guide plate 100 may be greater than or equal to the distance in the direction D3 between the inside of the top 210 and the inside of the bottom 220 (see FIGS. 3 and 3A-3B). Because the frame member 200 has elasticity, it can be flexed and stretched so that the glass light guide plate 100 fits into it to complete the assembly of the backlight module 10. Furthermore, the elasticity of the frame member 200 and the accommodating space S in the directions D1, D2, and D3 are matched with the size design of the glass light guide plate 100, so that there is an interference fit between the glass light guide plate 100 and the frame member 200 disposed therein. Wherein, the top 210, the wall portion 230 and the bottom 220 sandwich the glass light guide plate 100 to include an edge of the light exit surface 110, a portion of the bottom surface 130, and the side 130 outside the light entrance surface 130a, thereby forming the glass light guide plate 100 Provide a sufficiently rigid backlight module 10. The glass light guide plate 100 is covered with the elastic material of the frame member 200 on most edges (for example, the edge except the light incident surface 130a). Therefore, the frame member 200 provides the glass light guide plate 100 with buffer protection and makes the backlight module 10 It 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 effect of supporting and buffering. In addition, in other embodiments, the frame member 200 may also have other shapes, such as a ring shape, and a quadrilateral glass light guide plate 100, wherein the glass light guide plate 100 is sleeved into the ring frame member 200 to expand the frame member 200 into It has a corresponding quadrilateral, but the present invention does not limit the specific shape of the frame 200.

Please refer to FIG. 5 again, which is a schematic cross-sectional view of the embodiment shown in FIG. 1 after being combined. The backlight module 10 further includes a light source 300. In one 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 it is not limited thereto. The light emitting element 320 is, for example, a light emitting diode, but it is not limited thereto. As shown in FIGS. 4-5, the light source 300 is wholly or partially 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 portion 2301 provide the light source 300 configuration The limit function of gap G. In one embodiment, the distance between the light emitting surface 321 and the light incident surface 130a may be close to zero, that is, there is no gap design, and the light source 300 may abut the first wall portion 2302 with the circuit board 310. In this embodiment, the light source 300 can achieve close adhesion with the light emitting surface 321 by the elasticity of the frame member 200.

6 and 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, and the backlight module uses FIG. 6 Pieces of frame. As shown in FIGS. 6-7, the difference between the frame member 200a and the frame member 200 is that the frame member 200a further includes a first limiting portion 251 disposed inside the wall portion 230. Further, the first position-limiting portion 251 is disposed at both ends near the inside of the first wall portion 2301, and when the glass light guide plate 100 is disposed in the accommodating space S, the glass light guide plate 100 uses the edge of the light incident surface 130a It contacts the first limiting portion 251 and is separated from the first wall portion 2301 by a gap G. The first limiting portion 251 can be disposed inside the wall portion 230 by assembly, integral molding, etc., and the material can be the same as or similar to the body of the frame 200a, such as rubber, silicone, and elastomer. In addition, the distance between the first limiting portion 251 and the opposite (that is, opposite to the first wall portion 2301) parallel side direction D1 between the second wall portion 2302 may be equal to or smaller than the glass light guide plate 100 perpendicular to the light incident surface 130a The length of the side 130 is for the frame member 200a to further interference fit and fix with the glass light guide plate 100 without the use of additional fixing members or positioning members.

As shown in FIGS. 6-7, the frame member 200a may further include a corner of the second limiting portion 252 disposed on the side where the wall portion 230 and the top 210 meet, and the height may exceed the wall portion 230. In one embodiment, the second limiting portion 252 is disposed at the corner of the first wall portion 2301 connected to the second wall portion 2302 at both ends, and may be partially located inside the wall portion 230 A limiting portion 251 is arranged to overlap, for positioning such as tape. In this embodiment, the second position-limiting portion 252 further provides a good connection between the backlight module 10a and peripheral components. Specifically, taking a display device as an example, the backlight module 10a provides a backlight and has sufficient rigidity to support the display module, wherein the second limiting portion 252 has a positioning function for positioning the display module on the backlight module 10a Last scheduled location. Furthermore, the backlight module 10a is surrounded by the frame member 200a, and the frame member 200a is an elastic body, so it provides a cushioning effect relative to the display module or the outer casing of the device.

8 is an exploded schematic 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 exit surface 110 of the glass light guide plate 100. The optical film 400 may further include a prism sheet 410, a diffusion sheet 420, etc., but is not limited thereto. Referring again to FIG. 9, in this embodiment, the optical film 400 has lugs 430 distributed on the sides of the optical film 400, and the optical film 400 is further disposed on a portion of the light exit surface 110 that is not covered by the top 210; in other words In other words, the optical film 400 generally has a shape corresponding to the substantially exposed portion of the light exit surface 110, but it is not limited thereto. When the optical film 400 is disposed on the light emitting surface 110, the lug 430 protrudes to the notch 2100; in other words, the design of the position of the notch 2100 and the optical film 400 and the lug 430 can be matched with each other, but not limited to this . In one embodiment, the optical film 400 has a plurality of lugs 430 distributed at or near corners; the corners may include corners of adjacent sides, and the corners may include any The two ends of one side. In this embodiment, as shown in FIG. 9, a plurality of lugs 430 cooperate with the notch 2100 of the frame 200 a. The combination of the notch 2100 and the lug 430 can assist the arrangement and positioning of the optical film 400 on the light exit surface 110 and limit the displacement of the optical film 400 in the directions D1 and D2.

As shown in FIGS. 8 and 10, the backlight module 10b further includes an adhesive tape 600. The tape 600 may include a first tape 610, a second tape 620, etc., but is not limited thereto. In this embodiment, the first adhesive 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 to make the optical film 400 The second tape 620 is attached to the first tape 610 relative to the light source 300 and the frame 200a. In one embodiment, the adhesive tape 600 extends along the first wall portion 2301 to the top surface 2301a of the second wall portion 2302 on opposite sides of the frame 200a, and a notch 6000 is formed at the corner to match the corner Second limiting portion 252. The notch 6000 can also be used for positioning the adhesive tape 600. However, in other embodiments, the optical glue 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 surface 120 of the glass light guide plate 100, that is, the frame 200a can hold the glass light guide plate 100 and the reflective sheet 500 at the same time. Therefore, it is no longer necessary to use a fixing material such as adhesive tape between the reflective sheet 500 and the glass light guide plate 100, or between the reflective sheet 500 and the frame member 200/200a, thus saving material consumption, reducing assembly steps, and reducing manufacturing costs. In addition, the backlight module 10 may also be configured with a reflective sheet 500 between the bottom 220 of the frame 200 and the bottom surface 120 of the glass light guide plate 100, that is, the frame 200 also sandwiches the glass light guide plate 100 and the reflective sheet 500 at the same time.

The present invention further includes the display device 1. FIG. 11 is a schematic 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 in other embodiments, the backlight module 10 or 10a may be used in the display device. As shown in the figure, the display panel 20 is disposed on the backlight module 10b. In this embodiment, the frame 200a supports the display panel 20, but it is not limited thereto. In this embodiment, the display panel 20 is fixed by the second tape 620 adjacent to the light source 300. The side of the display panel 20 can abut on the second limiting portion 252. In one embodiment, the second limiting portion 252 is higher than the display panel 20. The height difference between the second limiting portion 252 and the display panel 20 may be equivalent to the width of the gap reserved between the upper part of the outer casing of the device and the display panel 20 after assembly. In short, the backlight module 10b can directly support the display panel 20, and the frame 220a and the outer shell are lined with the elastic material of the bottom 220 and the wall 230, and the second limiting portion 252 and the outer shell The upper part of the body abuts, wherein the second limiting portion 252 may also be an elastic material. Therefore, the backlight module 10b can be used as a supporting structure, and provides sufficient buffer between the backlight, the display panel thereon, and the outer shell, omitting the use of the back plate, the plastic frame, and the buffer auxiliary materials, thereby simplifying the device structure 3. Simplify production procedures and reduce production costs.

However, the above are only the preferred embodiments of the present invention, which should not be used to limit the scope of the implementation of the present invention, that is, simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the description of the invention, All of them are still covered by the patent of the present invention. In addition, any embodiment or scope of patent application of the present invention need not meet all the objectives, advantages or features disclosed by the invention. In addition, the abstract part and title are only used to assist the search of patent documents, not to limit the scope of the present invention. In addition, the terms "first" and "second" mentioned in this specification or the scope of patent application are only used to name the element or distinguish different embodiments or ranges, not to limit the number of elements. Upper or lower limit.

1‧‧‧Display device

10, 10a, 10b ‧‧‧ backlight module

20‧‧‧Display panel

100‧‧‧Glass light guide plate

110‧‧‧Glossy

120‧‧‧Bottom

130‧‧‧Side

130a‧‧‧entrance

200, 200a‧‧‧frame

210‧‧‧Top

2100‧‧‧Notch

220‧‧‧Bottom

230‧‧‧Wall

2301‧‧‧First Wall Department

2301a‧‧‧Top

2302‧‧‧Second Wall Department

251‧‧‧First Limit Department

252‧‧‧Second Limit Department

300‧‧‧Light source

310‧‧‧ circuit board

320‧‧‧Lighting element

321‧‧‧Luminous surface

400,410,420‧‧‧Optical diaphragm

430‧‧‧ lug

500‧‧‧Reflective film

600‧‧‧ Tape

610‧‧‧ First tape

620‧‧‧Second adhesive tape

6000‧‧‧Notch

P‧‧‧ opening

S‧‧‧accommodation space

G‧‧‧Gap

D1, D2, D3 ‧‧‧ direction

FIG. 1 is an exploded schematic view of a backlight module according to an embodiment of the invention. 2 is a schematic top view of a frame member according to an embodiment of the invention. FIG. 3 is a perspective schematic view of a frame according to an embodiment of the invention. FIG. 3A is an enlarged view of the R1 region in FIG. 3. FIG. 3B is an enlarged view of the R2 region in FIG. 3. 4 is a partial perspective view of a glass light guide plate disposed on a frame. 5 is a schematic cross-sectional view of the embodiment shown in FIG. 1 along line A-A. 6 is a schematic perspective view of a frame member according to another embodiment of the invention. FIG. 6A is an enlarged view of the R3 region in FIG. 6. FIG. 6B is an enlarged view of the R4 area in FIG. 6. 7 is a schematic cross-sectional view of a backlight module according to another embodiment of the invention. 8 is an exploded schematic view of a backlight module according to yet another embodiment of the invention. 9 is a partial schematic perspective view of the embodiment shown in FIG. 8. FIG. 10 is a schematic sectional view of the embodiment shown in FIG. 8. 11 is an exploded schematic diagram of a display device according to an embodiment of the invention.

100‧‧‧Glass light guide plate

110‧‧‧Glossy

200a‧‧‧frame

210‧‧‧Top

2100‧‧‧Notch

230‧‧‧Wall

2301‧‧‧First Wall Department

2302‧‧‧Second Wall Department

251‧‧‧First Limit Department

252‧‧‧Second Limit Department

400‧‧‧Optical diaphragm

430‧‧‧ lug

G‧‧‧Gap

D1, D2‧‧‧ direction

Claims (7)

A backlight module includes: a glass light guide plate having a light exit surface, a bottom surface and a plurality of side edges, the light exit surface is opposite to the bottom surface, and the side edges are connected to the light exit surface and the bottom surface, wherein the One of the side edges is a light-incident surface; and a frame member is an elastic body having a bottom, a wall portion, a plurality of tops, and a first limiting portion, wherein: the bottom has an opening, the The wall portion connects the bottom portion and the top portions, and forms an accommodating space with the bottom portion; the glass light guide plate is disposed in the accommodating space, and the top portions cover a part of the light exit surface, wherein the wall portion and the top portion There is a gap between the light incident surface, and the wall portion is in contact with the sides other than the light incident surface of the glass light guide plate; and the first limiting portion is disposed inside the wall portion, and the The edge of the light incident surface of the glass light guide plate abuts on the first limiting portion. The backlight module as described in item 1 of the patent application scope further includes a light source disposed in the gap. The backlight module as described in item 1 of the patent application scope further includes an optical film disposed on the light exit surface of the glass light guide plate, wherein one of the tops has a notch, and the optical film has a A lug, which protrudes into the gap. The backlight module as described in item 1 of the patent application scope further includes a reflective sheet disposed between the bottom and the bottom surface of the glass light guide plate. A display device, including: A backlight module includes: a glass light guide plate having a light emitting surface, a bottom surface and a plurality of sides, the light emitting surface is opposite to the bottom surface, and the sides are connected to the light emitting surface and the bottom surface, wherein the One of the sides is a light-incident surface; a frame is an elastic body with a bottom, a wall portion, a plurality of tops, and a first limiting portion, wherein: the bottom has an opening, the wall The body is connected to the bottom and the tops, and forms an accommodating space with the bottom; the glass light guide plate is disposed in the accommodating space, and the tops cover a part of the light exit surface, wherein the wall portion and the entrance There is a gap between the light surfaces, and the wall portion is in contact with the sides other than the light incident surface of the glass light guide plate; and the first limiting portion is disposed inside the wall portion, and the glass The edge of the light incident surface of the light guide plate abuts on the first limiting portion; and a display panel, which is disposed on the backlight module, and the frame supports the display panel. The display device described in item 5 of the patent application scope further includes a light source disposed in the gap. The display device as described in item 6 of the patent application scope, wherein the frame member further includes a second limiting portion, the second limiting portion is disposed at a corner of the side where the wall portion and the top meet, and the The side of the display panel abuts on the second limiting portion.

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