CN100399065C - Optical diffusion plate and backlight module using same - Google Patents

Abstract

The invention discloses an optical diffusion plate used for being matched with a liquid crystal display panel and a backlight module, wherein the backlight module mainly comprises a backlight shell, a reflecting plate, a light-emitting device, an optical diffusion plate and a membrane. The optical diffusion sheet mainly comprises a diffusion plate body, a first supporting part and a second supporting part. The diffusion plate body is provided with a light-emitting surface; the first supporting portion and the second supporting portion are respectively disposed at two sides of the diffuser body and respectively extend in a direction away from the light-emitting surface. The diaphragm is arranged on the diffusion plate body and is positioned between the first supporting part and the second supporting part. The first supporting part and the second supporting part are abutted and support the liquid crystal display panel.

Description

Optical diffusion plate and backlight module using the optical diffusion plate

technical field

The invention relates to an optical diffusion plate and a backlight module using the optical diffusion plate; more specifically, the invention relates to an optical diffusion plate and a backlight module for use with a liquid crystal display panel.

Background technique

Backlight modules are widely used in liquid crystal display devices, computer keyboards, mobile phone buttons, advertising billboards and other devices that require light sources to provide the planar light sources required by such devices. Especially in recent years, the market demand for liquid crystal display devices has grown significantly. In order to meet the functional and appearance requirements of liquid crystal display devices, the design of backlight modules used in liquid crystal display devices has also become increasingly diversified.

FIG. 1 is a schematic diagram of a conventional backlight module and a liquid crystal display panel. As shown in FIG. 1 , the backlight module 30 mainly includes a lower casing 31 , a reflector 32 , a light emitting device 33 , a diffusion plate 50 , a diaphragm 35 and an upper casing 37 . The light emitting device 33 is accommodated in the lower case 31 , and the reflector 32 is placed between the lower case 31 and the light emitting device 33 . A diffusion plate 50 and a diaphragm 35 are sequentially disposed on the light emitting device 33 . As shown in FIG. 1 , the diffusion plate 50 and the diaphragm 35 are both simple sheet structures, and are stacked on the light emitting device 33 in sequence. The upper case 37 covers and positions the diaphragm 35 and the diffusion plate 50 , and is joined with the lower case 31 .

The liquid crystal display panel 10 is disposed on the backlight module 30 and supported by the upper casing 37 . The outer frame 15 covers the liquid crystal display panel 10 and simultaneously covers the upper casing 37 and the lower casing 31 . In this conventional design, the casing 37 abuts against the liquid crystal display panel 10 and provides support required by the liquid crystal display panel 10 . However, in this design, since the upper case 37 itself has thickness, the arrangement of the upper case 37 will increase the overall thickness of the backlight module 30 . In addition, since the upper case 37 can only be assembled after the diffuser plate 50 and the diaphragm 35 are installed, the installation of the upper case 37 will also increase the assembly process and time.

Contents of the invention

An object of the present invention is to provide an optical diffuser, which has the function of supporting a liquid crystal display panel.

Another object of the present invention is to provide an optical diffuser with the function of positioning the film on it.

Another object of the present invention is to provide an optical diffuser, which can reduce the number of assembly components of the backlight module.

Another object of the present invention is to provide an optical diffuser, which can save the process and time of assembling the backlight module.

Another object of the present invention is to provide a backlight module with less assembly components.

Another object of the present invention is to provide a backlight module, which can save assembly process and time.

The optical diffuser of the present invention is used in a backlight module, and the optical diffuser includes: a diffuser body, including a first end, a second end, and a light-emitting surface between the first end and the second end ; at least one first supporting part is integrally arranged on the side of the diffusion plate body corresponding to the first end, and extends away from the light-emitting surface; and at least one second supporting part is integrally arranged on the A side of the diffuser body corresponds to the second end and extends away from the light-emitting surface.

The backlight module of the present invention is used in conjunction with a liquid crystal display panel, comprising: a backlight housing; a light-emitting device disposed in the backlight housing; an optical diffusion plate disposed on the light-emitting device and connected with the backlight housing connected, the optical diffuser plate includes: a diffuser plate body, including a first end, a second end, and a light-emitting surface between the first end and the second end; a first support portion, integrally arranged on The side of the diffuser body corresponding to the first end extends away from the light-emitting surface; and a second support part is integrally provided on the side of the diffuser body corresponding to the second end, and extend away from the light-emitting surface; and at least one film is arranged on the optical diffusion plate and is located between the first supporting part and the second supporting part.

The backlight module of the present invention mainly includes a backlight housing, a reflection plate, a light emitting device, an optical diffusion plate and a diaphragm. The reflecting plate and the light emitting device are sequentially arranged in the backlight casing, wherein the light emitting device preferably includes a plurality of lamp tubes. The optical diffusion plate is arranged on the light emitting device and connected with the backlight housing. The diaphragm is arranged above the optical diffusion plate. A liquid crystal display panel is arranged on the backlight module and is supported by an optical diffusion plate.

The optical diffuser mainly includes a diffuser body, a first support portion and a second support portion. The diffuser body includes a first end, a second end and a light emitting surface between the first end and the second end. The light emitting surface has a light emitting area. The first supporting portion and the second supporting portion are respectively disposed on the sides of the diffuser body corresponding to the first end and the second end, and extend in a direction away from the light-emitting surface. Preferably, the first supporting portion and the second supporting portion respectively extend along the edge of the light emitting area. The diaphragm is arranged on the diffuser body and is located between the first support part and the second support part. The first supporting part and the second supporting part contact and support the liquid crystal display panel.

In a preferred embodiment, the first supporting portion and the second supporting portion respectively extend outwards with connecting portions of the backlight housing. The backlight casing connection part is connected to the upper surface of the side wall of the backlight casing. In addition, the first supporting portion and the second supporting portion respectively extend a diaphragm positioning portion outward. The diaphragm arranged on the light-emitting surface extends into the space between the diaphragm positioning part and the diffusion plate body, so that the diaphragm positioning part can limit the displacement of the diaphragm.

Description of drawings

FIG. 1 is a schematic diagram of an existing backlight module and a liquid crystal display panel;

Fig. 2 is an exploded view of the components of the embodiment of the backlight module and the liquid crystal display panel of the present invention;

3 is a schematic diagram of an embodiment of an optical diffusion plate of the present invention;

Fig. 4 is a schematic cross-sectional view of the embodiment shown in Fig. 3;

5 is a schematic diagram of another embodiment of the optical diffusion plate of the present invention;

6 is a schematic cross-sectional view of an embodiment of a backlight module and a liquid crystal display panel of the present invention;

FIG. 7a is a schematic cross-sectional view of another embodiment of a backlight module and a liquid crystal display panel;

7b is a schematic cross-sectional view of another embodiment of a backlight module and a liquid crystal display panel;

8a is a schematic cross-sectional view of another embodiment of a backlight module and a liquid crystal display panel;

8b is a schematic cross-sectional view of another embodiment of the backlight module and the liquid crystal display panel;

Fig. 8c is a schematic cross-sectional view of another embodiment of the backlight module and the liquid crystal display panel;

9 is a schematic cross-sectional view of an embodiment of an optical diffusion plate including a diaphragm positioning portion;

FIG. 10 is a schematic diagram of another embodiment of an optical diffuser.

Description of main component symbols

10LCD display panel

15 frame

30 backlight module

31 lower shell

32 reflectors

33 lighting device

50 diffuser plate

35 diaphragm

37 upper shell

100 LCD display panel

150 LCD panel frame

300 backlight module

310 backlight housing

311 side wall

317 outer wall

319 protrusion

320 reflector

330 light emitting device

350 diaphragm

500 optical diffuser plate

510 first support part

520 second support part

530 The third supporting part

540 fourth support part

550 diffuser body

551 first end

552 second end

553 third end

554 fourth end

570 light emitting surface

575 light output area

590 Partition Department

600 outer frame blocking structure

800 buffer material

900 backlight housing connection

910 bending part

911 hole

950 Diaphragm Positioning Department

Detailed ways

The invention provides an optical diffusion plate and a backlight module using the optical diffusion plate. In a preferred embodiment, the backlight module is used for a liquid crystal display panel. However, in different embodiments, the backlight module can also be used for computer keyboards, mobile phone keys, signboards and other devices requiring planar light sources. In a preferred embodiment, the backlight module of the present invention is used in conjunction with a liquid crystal display panel to provide the backlight source required by the liquid crystal display panel.

In the embodiment shown in FIG. 2 , the backlight module 300 mainly includes a backlight housing 310 , a reflector 320 , a light emitting device 330 , an optical diffuser 500 and a diaphragm 350 . The backlight housing 310 serves as a base of the backlight module 300 . In a preferred embodiment, the backlight housing 310 is made of metal. However, in different embodiments, the backlight housing 310 can also be made of high-strength plastic.

As shown in FIG. 2 , the backlight casing 310 has sidewalls 311 , and the reflector 320 and the light emitting device 330 are sequentially disposed in the backlight casing 310 and located between the sidewalls 311 . Wherein the light emitting device 330 preferably includes a plurality of lamp tubes arranged in parallel. However, in different embodiments, the light emitting device 330 may also include a single linear light tube or an L-shaped light tube disposed on one side. The light tube mentioned here is preferably a cold cathode ray tube, but it can also be a line light source such as an external electrode lamp (EEFL) or a point light source such as a light-emitting diode or other different types of light sources. light source.

The optical diffuser 500 is disposed on the light emitting device 330 and connected to the backlight housing 310 . In a preferred embodiment, the optical diffuser plate 500 is connected to the upper surface of the side wall 311 of the backlight housing 310 . However, in different embodiments, the optical diffuser plate 500 can also be connected to the outer wall of the backlight housing 310 . The connection method may include screw connection, glue connection, card connection or other different connection methods. The diaphragm 350 is disposed above the optical diffuser 500 . The film 350 mentioned here is preferably an optical film, which can be, for example, a brightness enhancement film, a polarizing film, and the like.

The liquid crystal display panel 100 and the frame 150 of the liquid crystal display panel are disposed on the backlight module 300 . The light is emitted upward from the light emitting device 330 , passes through the optical diffusion plate 500 and the film 350 , and reaches the liquid crystal display panel 100 . The liquid crystal display panel 100 is preferably a color liquid crystal display panel. However, in different embodiments, the liquid crystal display panel 100 may also include a monochromatic liquid crystal panel.

FIG. 3 is a schematic diagram of an embodiment of an optical diffuser 500 . As shown in FIG. 3 , the optical diffuser 500 mainly includes a diffuser body 550 , a first support portion 510 and a second support portion 520 . The optical diffuser 500 mainly diffuses and uniformizes the light emitted by the light emitting device 330 . In a preferred embodiment, the optical diffuser 500 can also have the function of improving the front brightness.

The diffusion plate body 550 is preferably a light-transmitting plate body containing particles. In addition, in a preferred embodiment, the diffuser body 550 may also have an optical microstructure on the surface to increase the effect of diffusion or brightening. As shown in FIG. 3 , the diffuser body 550 includes a first end 551 , a second end 552 and a light emitting surface 570 located between the first end 551 and the second end 552 . The light emitting surface 570 is preferably the side of the diffuser body 550 facing the liquid crystal display panel 100 , that is, the opposite side facing the light emitting device 330 . In a preferred embodiment, the first end 551 and the second end 552 are oppositely disposed, and are preferably two corresponding long sides of the rectangular diffuser body 550 .

As shown in FIG. 3 , the first supporting portion 510 and the second supporting portion 520 are respectively disposed on sides of the diffuser body 550 corresponding to the first end 551 and the second end 552 . It can be seen from the cross-sectional view of FIG. 4 that the first supporting portion 510 and the second supporting portion 520 respectively extend in a direction away from the light-emitting surface 570 . In the embodiment shown in FIG. 3 and FIG. 4 , the first supporting portion 510 and the second supporting portion 520 are elongated sheet structures respectively, and extend vertically upward from the diffuser body 550 . However, in different embodiments, the first supporting portion 510 and the second supporting portion 520 may also have structures with other cross-sectional shapes, and their extending directions may form different angles with the diffuser body. In addition, the first supporting portion 510 and the second supporting portion 520 are preferably integrally formed with the diffusion plate body 550 . However, in different embodiments, the first supporting part 510 and the second supporting part 520 can also be made separately and then connected to the diffuser body 550 . It must be noted that, the first support portion 510 preferably has the same formation and arrangement as the second support portion 520 . However, under consideration of different designs, the first supporting portion 510 and the second supporting portion 520 may also be formed and arranged in different ways.

As shown in FIG. 3 , the light exit surface 570 also includes a light exit area 575 , and the light entering the optical diffuser 500 is emitted from the light exit area 575 . The light emitting area 575 is located between the first supporting portion 510 and the second supporting portion 520 . The first supporting portion 510 and the second supporting portion 520 respectively extend along the edge of the light emitting area 575 . In this preferred embodiment, the respective lengths of the first support portion 510 and the second support portion 520 may be equal to or less than the side length of the diffusion plate body 550; the first support portion 510 and the second support portion 520 may be respectively It may be formed by a continuous single support member (such as shown in FIG. 3 ), or formed by a plurality of discontinuous support members (such as shown in FIG. 5 ). In addition, in the embodiment shown in FIG. 3 and FIG. 5 , the first support portion 510 and the second support portion 520 are preferably arranged symmetrically. However, in different embodiments, the first support portion 510 and the second support portion 520 may also be arranged asymmetrically such as staggered.

As shown in FIG. 6 , the diaphragm 350 is disposed on the diffuser body 550 and is located between the first supporting portion 510 and the second supporting portion 520 . The first supporting portion 510 and the second supporting portion 520 contact and support the liquid crystal display panel 100 . In this embodiment, a buffer material 800 is disposed on the first support portion 510 and the second support portion 520 , that is, the first support portion 510 and the second support portion 520 are in contact with the liquid crystal display surface 100 through the buffer material 800 . When the backlight module 300 or the liquid crystal display panel 100 is subjected to an external force, the buffer material 800 can reduce damage to the liquid crystal display panel 100 by the first supporting portion 510 and the second supporting portion 520 . The buffer material 800 is preferably made of elastic materials such as shock-absorbing rubber and foam.

In the embodiment shown in FIG. 6 , the first supporting portion 510 and the second supporting portion 520 respectively have a backlight case connecting portion 900 extending outward. As shown in FIG. 6 , the backlight housing connecting portion 900 extends outward from the middle portion of the first supporting portion 510 and is parallel to the diffuser body 550 . The backlight housing connecting portion 900 is preferably integrally formed with the diffuser body 550 and the first supporting portion 510 . However, in different embodiments, the backlight housing connecting portion 900 may also be additionally connected to the first supporting portion 510 .

As shown in FIG. 6 , the backlight housing connecting portion 900 is connected to the upper surface of the side wall 311 of the backlight housing 310 . The preferred connection method is to use screw locking, but it can also be glued or clamped. In the embodiment shown in FIG. 7 a , the backlight housing connecting portion 900 extends outward from the first support portion 510 , and is further bent downward to form the bent portion 910 . The bent portion 910 is connected to the outer wall 317 of the backlight housing 310 . The preferred connection method is to set a perforated hole 911 on the bent portion 910, and set a protruding portion 319 on the outer surface of the outer wall 317 to engage with the perforated hole to form the bent portion 910 and the outer wall 317. The snap-in status of . However, in different embodiments, the arrangement of the perforated hole 911 and the protruding portion 319 can also be reversed, that is, the protruding portion is formed on the bent portion 910, and the corresponding perforated hole is formed on the outer wall; Different connection methods such as screw locking or glue connection are adopted. In the embodiment shown in FIG. 7 b , the bent portion 910 is formed by bending the connecting portion 900 of the backlight case upward. At this time, the bent portion 910 can be used as a frame blocking structure for resisting the inward pressure of the liquid crystal display panel frame 150 .

In the embodiment shown in FIG. 6 , the first supporting portion 510 is directly connected to the first end 551 . However, in another embodiment shown in FIG. 8 a , there is a spacer 590 between the first supporting portion 510 and the first end 551 . In other words, the spacer portion 590 can be regarded as extending outward from the bottom end of the first supporting portion 510 . In this embodiment, the spacer part 590 can serve as a connection part connected with the backlight housing 310 . In the embodiment shown in FIG. 8 b , the first end 551 can also extend the frame blocking structure 600 upward along the direction perpendicular to the light-emitting surface 570 to resist the inward pressure of the liquid crystal display panel frame 150 .

Figure 8c shows another embodiment of the present invention. In this embodiment, when the first supporting portion 510 is directly connected to the first end 551 , the bottom surface of the diffuser body 550 may also be directly connected to the upper surface of the side wall 311 of the backlight housing 310 . In this embodiment, a preferred connection method between the diffuser body 550 and the upper surface of the side wall 311 of the backlight housing 310 is to use double-sided adhesives.

In the embodiment shown in FIG. 9 , the optical diffuser plate 500 further includes a diaphragm positioning portion 950 . The diaphragm positioning portion 950 extends inward from the first supporting portion 510 and the second supporting portion 520 respectively. The edge of the diaphragm 350 disposed on the light-emitting surface 570 can extend into between the diaphragm positioning portion 950 and the diffuser body 550 , so that the diaphragm positioning portion 950 can limit the displacement of the diaphragm 350 . In addition, the edge of the diaphragm 350 can also be designed corresponding to the concave-convex distribution of the diaphragm positioning portion 950 , so as to form an edge with concave-convex intervals. The diaphragm positioning portion 950 is preferably parallel to the light-emitting surface 570 ; however, in different embodiments, the diaphragm positioning portion 950 may form different angles with the light-emitting surface 570 .

As shown in FIG. 9 , the diaphragm positioning portion 950 is preferably formed by bending the first support portion 510 or the second support portion 520 inwardly; however, in different embodiments, the diaphragm positioning portion 950 can also be formed from the second The middle section of the first supporting part 510 or the second supporting part 520 is formed by extending inward. The diaphragm positioning part 950 is preferably integrally formed with the first support part 510 or the second support part 520; however, in different embodiments, the diaphragm positioning part 950 can also be externally connected to the first support part 510 or the second support part 510. The support part 520 .

In the embodiment shown in FIG. 10 , the diffusion plate body 550 is a rectangular plate body, the first end 551 and the second end 552 are long sides opposite to each other, and the third end 553 and the fourth end 554 are opposite to each other. Set the short side. The first end 551 , the second end 552 , the third end 553 and the fourth end 554 form four end edges of the diffuser body 550 .

As shown in FIG. 10 , the optical diffuser 500 further includes a third support portion 530 and a fourth support portion 540 . The third supporting portion 530 and the fourth supporting portion 540 are respectively disposed on the sides of the diffuser body 550 corresponding to the third end 553 and the fourth end 554 . The third supporting portion 530 and the fourth supporting portion 540 respectively extend in a direction away from the light emitting surface 570 . The light emitting area 575 is located between the first support portion 510 , the second support portion 520 , the third support portion 530 and the fourth support portion 540 .

In a preferred embodiment, the third support portion 530 and the fourth support portion 540 are arranged symmetrically; however, in different embodiments, the third support portion 530 and the fourth support portion 540 may also be arranged in an asymmetrical manner such as staggered . In addition, the third support portion 530 and the fourth support portion 540 preferably have the same formation method and cross-sectional structure as the first support portion 510 or the second support portion 520; however, in different embodiments, the third support portion 530 The design of the fourth support part 540 may also be different from that of the first support part or the second support part 520 .

The present invention has been described by the above-mentioned related embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, modifications and equivalent arrangements included in the spirit and scope of the claims are included in the scope of the present invention.

Claims (22)

1. an optical diffusing plate uses for a backlight module, and this optical diffusing plate comprises:

One diffuser plate body, comprise one first end, one second end and be positioned at this first end and this second end between an exiting surface;

At least one first support portion is arranged at the side of this diffuser plate body corresponding to this first end integratedly, and extends towards the direction away from this exiting surface; And

At least one second support portion is arranged at the side of this diffuser plate body corresponding to this second end integratedly, and extends towards the direction away from this exiting surface.

2. optical diffusing plate as claimed in claim 1, wherein this first support portion comprises discontinuous a plurality of support member at least.

3. optical diffusing plate as claimed in claim 1, wherein this first support portion and this first end join.

4. optical diffusing plate as claimed in claim 1 wherein has a spacer portion between this first support portion and this first end.

5. optical diffusing plate as claimed in claim 4, wherein this diffuser plate body extends a housing barrier structure from this first end along vertical this exiting surface direction.

6. optical diffusing plate as claimed in claim 1, wherein this first support portion housing connecting portion backlight that stretches out.

7. optical diffusing plate as claimed in claim 6, wherein this housing connecting portion backlight comprises a kink.

8. optical diffusing plate as claimed in claim 1, wherein the top of this first support portion is provided with a fender.

9. optical diffusing plate as claimed in claim 1 further comprises a diaphragm location division, and this diaphragm location division is to extend internally from this first support portion.

10. optical diffusing plate as claimed in claim 9, wherein this diaphragm location division is bent inwards by first support portion and forms.

11. optical diffusing plate as claimed in claim 1, wherein this first end and this second end are the subtend settings, and further comprise:

One the 3rd support portion; And

One the 4th support portion;

Wherein this diffuser plate body comprises one the 3rd end and one the 4th end that subtend is provided with; The 3rd support portion and the 4th support portion are arranged at the side of this diffuser plate body corresponding to the 3rd end and the 4th end respectively, and extend towards the direction away from this exiting surface.

12. a backlight module for being used with a display panels, comprising:

One housing backlight;

One light-emitting device is arranged in this housing backlight;

One optical diffusing plate is arranged on this light-emitting device, and is connected with this housing backlight, and this optical diffusing plate comprises:

One diffuser plate body, comprise one first end, one second end and be positioned at this first end and this second end between an exiting surface;

One first support portion is arranged at the side of this diffuser plate body corresponding to this first end integratedly, and extends towards the direction away from this exiting surface; And

One second support portion is arranged at the side of this diffuser plate body corresponding to this second end integratedly, and extends towards the direction away from this exiting surface; And

At least one diaphragm is arranged on this optical diffusing plate, and between this first support portion and this second support portion.

13. backlight module as claimed in claim 12, wherein this first support portion comprises discontinuous a plurality of support member at least.

14. backlight module as claimed in claim 12, wherein this first support portion and this first end join.

15. backlight module as claimed in claim 12 wherein has a spacer portion between this first support portion and this first end.

16. backlight module as claimed in claim 15, wherein this diffuser plate body extends a housing barrier structure from this first end along vertical this exiting surface direction.

17. backlight module as claimed in claim 12, this first support portion housing connecting portion backlight that stretches out wherein, this housing connecting portion backlight is connected with a upper surface of this housing backlight.

18. backlight module as claimed in claim 17, wherein this housing connecting portion backlight comprises a kink, and this kink is connected with a lateral wall of this housing backlight.

19. backlight module as claimed in claim 12, wherein the top of this first support portion is provided with a fender.

20. backlight module as claimed in claim 12, wherein this optical diffusing plate comprises a diaphragm location division, and this diaphragm location division extends internally from this first support portion, and this diaphragm stretches between this diaphragm location division and this diffuser plate body.

21. backlight module as claimed in claim 20, wherein this diaphragm location division is bent inwards by first support portion and forms.

22. backlight module as claimed in claim 12, wherein this first end and this second end are the subtend settings, and this optical diffusing plate comprises:

One the 3rd support portion; And

One the 4th support portion;

Wherein this diffuser plate body comprises one the 3rd end and one the 4th end that subtend is provided with; The 3rd support portion and the 4th support portion are arranged at the side of this diffuser plate body corresponding to the 3rd end and the 4th end respectively, and extend towards the direction away from this exiting surface.

Images