CN110543037B

CN110543037B - Display device

Info

Publication number: CN110543037B
Application number: CN201910843422.8A
Authority: CN
Inventors: 廖乾廷
Original assignee: AU Optronics Corp
Current assignee: AU Optronics Corp
Priority date: 2018-12-05
Filing date: 2019-09-06
Publication date: 2022-06-28
Anticipated expiration: 2039-09-06
Also published as: CN110543037A

Abstract

A display device comprises a back cover, a light guide plate, a circuit board and a liquid crystal display panel. The back of the body lid contains the bottom surface wall, extends board and barricade and is located one side of bottom surface wall, and the breach groove has been seted up to the barricade, extends the board and is located breach groove below, lies in different planes with the barricade, and extends the board and extend towards the direction of keeping away from the barricade. The light guide plate is positioned in the back cover and above the bottom surface wall, the circuit board is arranged on the back cover and spans from the outer side of the back cover to the inner side of the back cover through the notch groove, the circuit board is respectively connected with the extension plate and the light guide plate and is supported on the extension plate, and the liquid crystal display panel is positioned on the circuit board and is connected with the circuit board.

Description

Display device

Technical Field

The present invention relates to a display device, and more particularly, to a display device using a circuit board with a design structure to replace a plastic frame.

Background

Display devices such as computer screens and televisions are widely used with the advancement of technology. In addition, demands for display devices are also gradually increasing, for example, to make the display devices thinner, to improve display resolution, and to design narrow sides.

Conventionally, some display devices are composed of a rubber frame and an iron frame, which are fixed by a welding means in one side. Therefore, the light mixing distance between the light emitting side of the internal lamp strip and the display area is reduced, and the overall light emitting effect is poor. On the other hand, the light guide plate and the light bar in the display device are mostly arranged on one side of the light-emitting element in a strip shape by the double-sided adhesive tape for bonding, so that the brightness of the light-emitting side is easily reduced, and in addition, the double-sided adhesive tape is not properly attached, so that the light-emitting of the light bar is easily influenced, the light-emitting effect is reduced, and the visual perception of a user is influenced.

In the production process, for the automated assembly, holes are usually required to be formed on the bottom edge of the iron frame to allow the flat cables of the light bar and the electrical substrate to penetrate through for use, or to have a folded structure for matching with the locking electrical substrate, so that the strength of the iron frame is relatively weakened. In addition, the light bar and the electric substrate are fixed by welding means corresponding to the iron frame and the rubber frame, so that the manufacturing cost of repeated welding is increased.

Disclosure of Invention

In view of the above, an embodiment of the invention provides a display device including a back cover, a light guide plate, a circuit board and a liquid crystal display panel.

The back of the body lid contains bottom surface wall, barricade and extends the board, and the barricade extends in a side edge of bottom surface wall, and the barricade has seted up a breach groove, and extends the board and extend in breach groove below, and extend the board and extend towards the direction of keeping away from the barricade to be parallel with bottom surface wall substantially. The light guide plate is positioned in the back cover and above the bottom surface wall. The circuit board is arranged on the back cover, spans from the outer side of the back cover to the inner side of the back cover through the notch groove, is respectively connected with the extension plate and the light guide plate, and is supported on the extension plate. The liquid crystal display panel is positioned on the circuit board and connected to the circuit board.

In an embodiment of the foregoing display device, the circuit board includes a main body portion and a protruding portion, the main body portion is connected to the protruding portion, and the thickness of the main body portion is smaller than that of the protruding portion, a step groove is formed at a connection position of the main body portion and the protruding portion, a notch of the step groove faces the extension board, and the extension board is located in the step groove and connected to the main body portion.

In an embodiment of the display device, the main body includes a plurality of insertion through holes arranged at equal intervals along an extending direction of the main body. The light guide plate comprises a plurality of inserting structures corresponding to the inserting through holes, and the inserting structures are respectively inserted into the inserting through holes to limit the circuit board by the light guide plate.

In an embodiment of the display device, each of the plug structures includes a protrusion and a plug portion, the protrusion is connected to the plug portion and located on different planes, and each of the plug portions is plugged into the plug through hole and connected to the plug through hole by a heat-melting method.

In an embodiment of the display device, the circuit board includes a plurality of light emitting elements disposed on the bottom surface of the body portion and respectively located in the gaps of the inserting through holes.

In an embodiment of the display device, a conductive layer is disposed between the extension plate and the body portion.

In an embodiment of the display device, a side of the light guide plate facing the circuit board includes a plurality of protruding portions, the protruding portions are arranged at intervals, a conductive adhesive layer is disposed between the conductive layer and the extension plate, the conductive adhesive layer includes a plurality of protruding portions corresponding to the protruding portions, and each protruding portion is bonded to the main body portion and the protruding portion.

In an embodiment of the display device, the circuit board includes a plurality of light emitting elements disposed on the bottom surface of the main body and respectively located in the space between the protruding portions.

In an embodiment of the foregoing display device, the display device further includes a flexible circuit board electrically connected to the liquid crystal display panel, the flexible circuit board is located above the circuit board, and a first electrical connection structure is disposed on a bottom surface of the flexible circuit board, and a second electrical connection structure is disposed on a top surface of the circuit board and electrically connected to the first electrical connection structure.

In an embodiment of the foregoing display device, the optical film is adjacent to a side edge line of the main body portion, the optical film includes a first abutting structure located on the side edge line, and the main body portion includes a second abutting structure corresponding to the first abutting structure and respectively abutting against the first abutting structure.

In an embodiment of the foregoing display device, the display device further includes a position-limiting portion disposed on the top surface of the circuit board, the position-limiting portion limiting movement of the liquid crystal display panel.

In an embodiment of the display device, the position-limiting portion is an insulator and has elasticity.

Through the structural design of the display device in one or more embodiments, the circuit board can support the liquid crystal display panel, the traditional gluing frame is replaced, and the problems that the strength of the iron frame is weakened and the light-emitting effect of the display device is poor in the prior art are solved.

Drawings

Fig. 1A is an external view of a display device according to an embodiment of the invention.

Fig. 1B is an external view of the back cover of the display device shown in fig. 1A.

FIG. 2A is a side view of the display device of FIG. 1A with 2A-2A as a secant.

FIG. 2B is a side view of the display device of FIG. 1A with 2B-2B taken as a secant.

FIG. 2C is a side view of the display device of the embodiment shown in FIG. 1A, with 2C-2C being a section line.

Fig. 3A is a top view of a circuit board in a display device according to an embodiment of the invention.

Fig. 3B is a bottom view of a circuit board in a display device according to an embodiment of the invention.

Fig. 4 is a schematic view illustrating a connection state between a circuit board and a light guide plate in a display device according to an embodiment of the invention.

Fig. 5A is an exploded view of a connection state between a circuit board and a light guide plate in a display device according to another embodiment of the invention.

FIG. 5B is a schematic diagram of the embodiment shown in FIG. 5A.

FIG. 5C is a side view of the embodiment shown in FIG. 5B, with 5C-5C being the cut line.

FIG. 5D is a side view of the embodiment shown in FIG. 5B, with 5D-5D being the cut line.

Fig. 6 is a top view of a flexible circuit board in a display device according to an embodiment of the invention.

FIG. 7A is a partial schematic view of FIG. 1A of embodiment 7A.

FIG. 7B is a partial schematic view of FIG. 1A illustrating embodiment 7B.

The reference numbers are as follows:

1 display device

11 back cover

11a outer side

11b inner side

111 bottom wall

112 extension board

113 retaining wall

114 notched groove

12 light guide plate

121 plugging structure

1211 protrusion

1212 inserting part

122 convex part

13 Circuit board

131 body part

1311 insertion through hole

1312 second docking structure

132 convex exposed part

133 step groove

134 light emitting element

135 second electrical connection structure

14 liquid crystal display panel

15 conductive layer

16 conductive adhesive layer

161 projection

17 flexible circuit board

171 first electrical connection structure

18 optical film

181 first butt joint structure

19 limiting part

20 reflective sheet

Detailed Description

Please refer to fig. 1A to 1B and fig. 2A to 2C. Fig. 1A is an external view of a display device 1 according to an embodiment of the invention. Fig. 1B is an external view of the back cover 11 in the display device 1 of the embodiment shown in fig. 1A. Fig. 2A is a side view of the display device 1 of the embodiment shown in fig. 1A, with 2A-2A taken as a section line. Fig. 2B is a side view of the display device 1 of the embodiment shown in fig. 1A, with 2B-2B taken as a section line. Fig. 2C is a side view of the display device 1 of the embodiment shown in fig. 1A, with 2C-2C taken as a section line.

The display device 1 includes a back cover 11, a light guide plate 12, a circuit board 13, and a liquid crystal display panel 14. The back cover 11 includes a bottom wall 111, an extending plate 112 and a retaining wall 113, wherein the extending plate 112 and the retaining wall 113 are located on one side of the bottom wall 111, for example, on the bottom side. The retaining wall 113 extends to a side edge of the bottom wall 111, and the retaining wall 113 is provided with a notch 114. The extending plate 112 is located below the notch groove 114, and the extending plate 112 extends toward the outer side of the retaining wall 113 and is substantially parallel to the bottom wall 111. In this embodiment, the notch groove 114 is located at the center of the bottom side of the back cover 11, however, the invention is not limited thereto, and the size of the notch groove 114 is not limited (as shown in fig. 1B).

The light guide plate 12 is located in the back cover 11 and above the bottom wall 111. The circuit board 13 is disposed on the back cover 11 and spans from the outer side 11a of the back cover 11 to the inner side 11b of the back cover 11 through the notch 114, and the circuit board 13 is connected to the extension board 112 and the light guide plate 12, respectively, and is supported by the extension board 112. The liquid crystal display panel 14 is located on the circuit board 13, and is connected to the circuit board 13. As shown in fig. 2A, a reflective sheet 20 is disposed below the light guide plate 12, and in an embodiment, an adhesive tape (not shown) may be disposed below a portion (e.g., a side far from the light incident side) of the light guide plate 12 where the reflective sheet 20 is not overlapped with the light guide plate 12, so that the adhesive tape adheres the light guide plate 12 to the back cover 11.

As shown in fig. 2B and 2C, the circuit board 13 includes a main body 131 and a protrusion 132, the main body 131 is connected to the protrusion 132, the thickness of the main body 131 is smaller than that of the protrusion 132, a step groove 133 is formed at the connection position of the main body 131 and the protrusion 132, the notch of the step groove 133 faces the extension board 112, and the extension board 112 is located in the step groove 133 and connected to the main body 131. Since the number of electronic components inside the display device 1 is large, when a plurality of electronic components are adhered, the number of the corresponding wires is also large, and the wires are easily arranged by designing the thickness difference between the body portion 131 and the protruding portion 132.

Referring to fig. 2B, and fig. 3A and 3B, fig. 3A is a top view of a circuit board 13 in the display device 1 according to the embodiment of the invention. Fig. 3B is a bottom view of the circuit board 13 in the display device 1 according to the embodiment of the invention. Fig. 3A shows the top surface of the circuit board 13, and fig. 3B shows the bottom surface of the circuit board 13. In this embodiment, the main body 131 of the circuit board 13 includes a plurality of plug-in through holes 1311 arranged at equal intervals along the extending direction of the main body 131. Correspondingly, the light guide plate 12 includes a plurality of plug structures 121, and the plug structures 121 can be respectively plugged into the plug through holes 1311, so that the light guide plate 12 limits the circuit board 13, as shown in fig. 3B. On the other hand, the circuit board 13 includes a plurality of light emitting elements 134 disposed on the bottom surface of the main body 131 and respectively located in the interval of the plugging through holes 1311.

Fig. 4 is a schematic view of a connection state between the circuit board 13 and the light guide plate 12 in the display device 1 according to an embodiment of the present invention, and fig. 4 is a schematic view from a top view. In this embodiment, each plug structure 121 includes a protrusion 1211 and a plug portion 1212, the protrusion 1211 is connected to the plug portion 1212 and located on different planes, and each plug portion 1212 is plugged into the plug through hole 1311 and connected to the plug through hole 1311 by thermally compressing the plug portion 1212 through a thermal melting method.

Referring to fig. 5A to 5D, fig. 5A is an exploded schematic view of a connection state between a circuit board 13 and a light guide plate 12 in a display device 1 according to another embodiment of the invention. FIG. 5B is a schematic diagram of the embodiment shown in FIG. 5A. FIG. 5C is a side view of the embodiment shown in FIG. 5B, with 5C-5C being a secant line. FIG. 5D is a side view of the embodiment shown in FIG. 5B, with 5D-5D being a secant line. Fig. 5A and 5B are illustrated in a bottom view.

In this embodiment, a conductive layer 15 and a conductive adhesive layer 16 are sequentially disposed between the extension board 112 and the body portion 131, and the circuit board 13 and the light guide plate 12 are connected and fixed through the conductive adhesive layer 16. The conductive layer 15 is, for example, a metal layer, and in one embodiment, the metal is copper. The light guide plate 12 includes a plurality of protrusions 122 on a side facing the circuit board 13, in this embodiment, the protrusions 122 are arranged at equal intervals, the conductive adhesive layer 16 includes a plurality of protrusions 161 corresponding to the protrusions 122, and each protrusion 161 is adhered to the body 131 and the protrusion 122. The circuit board 13 includes a plurality of light emitting elements 134 disposed on the bottom surface of the main body 131, and the light emitting elements 134 are respectively located in the gaps of the protruding portions 122. The light emitting element 134 is, for example, an LED, but not limited thereto.

Referring to fig. 1A and fig. 2A, and fig. 6, fig. 6 is a top view of a flexible circuit board 17 in the display device 1 according to the embodiment of the invention. In this embodiment, the display device 1 further includes a flexible circuit board 17. The flexible circuit board 17 is electrically connected to the liquid crystal display panel 14 and located above the circuit board 13, and the bottom surface of the flexible circuit board 17 is provided with a first electrical connection structure 171, the top surface of the circuit board 13 is provided with a second electrical connection structure 135, and the second electrical connection structure 135 is electrically connected to the first electrical connection structure 171. The first electrical structure 171 and the second electrical structure 135 may be metal conductive layers. In some embodiments, the first electrical structure 171 and the second electrical structure 135 can electrically connect the flexible circuit board 17 and the circuit board 13 by soldering. The hardness of the circuit board 13 may be greater than the hardness of the flexible circuit board 17.

Please refer to fig. 2B to fig. 2C and fig. 3A. In this embodiment, the display device 1 further includes a position-limiting portion 19 disposed on the top surface of the circuit board 13, and the position-limiting portion 19 can limit the movement of the liquid crystal display panel 14. In some embodiments, the limiting portion 19 is an insulator and has elasticity. For example made of a plastic material such as rubber.

Referring to fig. 1A, and referring to fig. 7A and 7B, fig. 7A and 7B are partial schematic views of

embodiments

7A and 7B shown in fig. 1A, respectively. Note that, for the sake of clarity of the structure, the liquid crystal display panel 14 is omitted here. As shown in fig. 7A and 7B, the display device 1 further includes an optical film 18, the optical film 18 is adjacent to a side line of the body portion 131, the optical film 18 includes a first docking structure 181 located on the side line, and the body portion 131 includes a second docking structure 1312 corresponding to the first docking structure 181 and respectively docking with the first docking structure 181. As shown in fig. 7A and 7B, the first abutting structure 181 is a protruding structure, and the second abutting structure 1312 is a recessed structure, although the invention is not limited thereto. The first and

second docking structures

181 and 1312 dock with each other to define the position of the optical film 18 and limit the movement thereof.

Through the structural design of the display device in one or more embodiments, the circuit board can be used for supporting the liquid crystal display panel, and in addition, the circuit board is provided with the second butt joint structure, so that the position of the optical film can be limited. With the structure, the use of the traditional gluing frame can be replaced.

In one embodiment, the light-emitting element is directly disposed on the circuit board, so that the manufacturing cost of the light bar can be reduced.

In another embodiment, the conductive adhesive layer is electrically connected with the conductive layer on the circuit board to have the grounding effect, so that the traditional method of locking the circuit board by screws can be replaced and the grounding purpose can be achieved.

In addition, in some embodiments, the light guide plate can be fixed on the circuit board by welding, clamping or gluing, so that the problem of brightness attenuation in the non-light-emitting region can be solved, the distance of the light mixing region cannot be reduced, and good optical quality is kept.

Claims

1. A display device, comprising:

a back cover, including a bottom wall, a retaining wall and an extending plate, wherein the retaining wall extends to one side edge of the bottom wall, and the retaining wall is provided with a notch groove, the extending plate extends below the notch groove, and the extending plate extends towards a direction far away from the retaining wall and is substantially parallel to the bottom wall;

a light guide plate located in the back cover and above the bottom wall;

a circuit board, which is arranged on the back cover and stretches across from one outer side of the back cover to one inner side of the back cover through the gap groove, and the circuit board is respectively connected with the extension plate and the light guide plate and is supported on the extension plate; and

And the liquid crystal display panel is positioned on the circuit board and connected with the circuit board.

2. The display device of claim 1, wherein the circuit board comprises a main body and a protrusion, the main body is connected to the protrusion, and the main body has a thickness smaller than that of the protrusion, a step groove is formed at the connection position of the main body and the protrusion, the groove opening of the step groove faces the extension board, and the extension board is located in the step groove and connected to the main body.

3. The display device according to claim 2, wherein the body portion comprises a plurality of insertion through holes spaced apart along an extending direction of the body portion; the light guide plate comprises a plurality of inserting structures corresponding to the plurality of inserting through holes, and the inserting structures are respectively inserted into the plurality of inserting through holes so that the light guide plate limits the circuit board.

4. The display device as claimed in claim 3, wherein each of the plugging structures comprises a protrusion and a plugging portion, the protrusion is connected to the plugging portion and located on different planes, and each of the plugging portions is plugged into the plurality of plugging through holes and connected to the plurality of plugging through holes by a heat-melting means.

5. The display device as claimed in claim 3, wherein the circuit board comprises a plurality of light emitting elements disposed on a bottom surface of the body portion and respectively located in the spaces of the plurality of plugging through holes.

6. The display device of claim 2, wherein a conductive layer is disposed between the extension plate and the body portion.

7. The display device according to claim 6, wherein a side of the light guide plate facing the circuit board includes a plurality of protrusions arranged at intervals, a conductive adhesive layer is disposed between the conductive layer and the extension plate, the conductive adhesive layer includes a plurality of protrusions corresponding to the plurality of protrusions, and each protrusion is bonded to the main body and the protrusion.

8. The display device of claim 7, wherein the circuit board comprises a plurality of light emitting elements disposed on a bottom surface of the main body and respectively located in the spaces of the plurality of protrusions.

9. The display device of claim 1, further comprising a flexible circuit board electrically connected to the liquid crystal display panel, wherein the flexible circuit board is disposed above the circuit board, and a bottom surface of the flexible circuit board is disposed with a first electrical connection structure and a top surface of the circuit board is disposed with a second electrical connection structure electrically connected to the first electrical connection structure.

10. The display device of claim 2, further comprising an optical film adjacent to a side line of the body portion, the optical film comprising a first docking structure on the side line, the body portion comprising a second docking structure corresponding to the first docking structure for docking with the first docking structure respectively.

11. The display device according to claim 1, further comprising a position-limiting portion disposed on a top surface of the circuit board, the position-limiting portion limiting movement of the liquid crystal display panel.

12. The display device according to claim 11, wherein the position-limiting portion is an insulator and has elasticity.