TWI387815B - A backlight module and a liquid crystal display using the same - Google Patents

Description

Backlight module and liquid crystal display thereof

The present invention relates to a backlight module, and more particularly to a backlight module that uses an extended portion of an optical film to fix a wire.

With the advancement of science and technology, the liquid crystal display with many advantages such as power saving, no radiation, small size, low power consumption, plane right angle, high resolution, stable picture quality, etc., is the traditional image tube screen that was originally exclusive. CRT) has brought great impact, especially the increasing popularity of various information products such as mobile phones, notebook computers, digital cameras, PDAs, LCD screens, etc., which has greatly increased the demand for liquid crystal displays (LCDs). .

The liquid crystal display mainly includes a liquid crystal display panel and a backlight module, wherein the liquid crystal display panel is composed of a color filter substrate, a TFT array substrate, and a TFT array substrate. The liquid crystal layer between the two substrates is formed. Wherein, since the liquid crystal display panel itself is not a self-illuminating type display device, a backlight module must be provided under the liquid crystal display panel to provide a surface light source required for the liquid crystal panel, so that the liquid crystal display can achieve the display effect, and At the same time, get enough brightness and contrast to achieve the displayed function.

The backlight module is usually divided into a side-input type and a direct type. The side-lit backlight module has a light guide plate, and the line source is disposed on one side of the light guide plate to convert the incident line source into a liquid crystal display panel by the light guide plate. The surface light source. In addition, the light source of the direct-lit backlight module is disposed directly under the liquid crystal display panel, and can directly provide the surface light source required for the liquid crystal display panel, so that the light guide plate is not required, so when the display has high requirements on the brightness of the light source, usually The latter will be used. At present, the surface light source provided by the direct type backlight module is constructed in two ways, one of which is formed by arraying a plurality of light emitting diodes, and the other method is composed of multiple A cold cathode fluorescent lamp is arranged in parallel and is called a multi-lamp backlight module.

The cold cathode fluorescent lamp of the conventional multi-lamp backlight module is driven by an alternating current power source, wherein the power supply device is connected in series with the power terminals of all the cold cathode fluorescent lamps to provide the illumination of the cold cathode fluorescent lamp. The drive current. In addition, in order to detect the actual current value of the lamp to maintain stable light quality, the low-voltage end (return end) of the cold cathode fluorescent lamp is equipped with a feedback line for transmitting feedback signals to the feedback control of the system. The device and the feedback control device can instantly detect the current in the cold cathode fluorescent lamp by the feedback signal returned by the lamp, and control the power supply device to perform feedback compensation of the driving current to make the cold cathode fluorescent The lamp maintains a stable output. In addition, the backlight module further includes a plurality of flexible line (FFC) connection backlight modules and a liquid crystal display panel for transmitting signals of the liquid crystal display panel.

Please refer to FIG. 1A, which is a schematic diagram of components of a liquid crystal display of the prior art. The liquid crystal display 1 has a module frame 11 (Bezel), a panel unit 12, a backlight unit 13 (back-light unit), a flexible cable 14 (FFC), a feedback signal wire 15 (signal wire), and Transformer 16 (Inverter).

In general, when designing the overall structure of the liquid crystal display, the designer will deliberately increase the length of the above-mentioned flexible cable 14 and the feedback signal conductor 15 in consideration of manufacturing tolerances and assembly tolerances to facilitate assembly by the manufacturer. However, this design instead requires the backlight module 13 to be assembled with one or more wire fixtures to secure the flexible cable 14 and the feedback signal conductor 15 to avoid excessive length of wire that may allow the manufacturer to During other operations or handling, accidentally hooking the wire causes damage to the originally connected wire or breakage.

As shown in FIG. B, it is a partial view of the backlight module 13 in the first A diagram. Wherein, the low-voltage end of the loop connecting lamp and the feedback signal wire 15 of the transformer 16 are wound around the outside of the back frame 131 of the backlight module 13, and a wire fixing device 2 can be used to achieve the purpose of fixing the wire. The wire fixing device 2 described above may be a tape structure 21 for attaching and fixing the wire. In addition, the wire fixing device 2 may also be a fixing seat 22 for fastening the wire therein.

However, whether a tape structure 21 or a fixing seat 22 is used to attach and fix the wire, an additional component is added, which not only causes an increase in part of the material cost, but may also be reduced. The flexibility of space utilization in institutional design. Therefore, the designer does not have to think about developing a structure that can save material costs while having the fixed function of the wire.

In view of the above, in order to effectively solve the above problems, the present invention provides a backlight module, which can be used to replace the wire fixing device in the conventional liquid crystal display.

The backlight module includes at least a back frame, a first optical film, and at least one wire. The back frame includes a bottom plate and a side wall extending upward from a periphery of the bottom plate, and the back frame has at least one opening. The first optical film is disposed on the bottom plate and extends upward along the sidewall. The wire is located outside the back frame, and part of the first optical film can be extended to the outside of the back frame by the opening on the side wall, and the wire is fixed on the outer surface of the back frame.

The advantages and spirit of the present invention, as well as the more detailed embodiments, can be further understood from the following embodiments and the accompanying drawings.

Please refer to the second figure, which shows a partial view of a conventional direct type backlight module 3. As shown in the figure, the backlight module 3 mainly includes a back frame 31, an optical film set 32, a tube set 33, and an upper frame 34. The optical film group 32 includes a reflective sheet 32a attached to the upper surface of the back frame 31 to improve the light utilization efficiency in the backlight module 3. The attachment method of the reflective sheet 32a can be performed by using a double-sided tape or directly. A glue is prepared on the lower surface of the reflection sheet 32a to be bonded to the back sheet 31. It should be noted that although the combination of the reflection sheet 32a and the back frame 31 is often presented in a manner of attachment, it is not limited to any of the above. In addition, the optical film set 32 further includes a diffuser plate 32b disposed above the tube group 33 and a light collecting sheet. Of course, it may be a diffusing sheet or a plurality of diffusing sheets, or a collecting sheet and a diffusing sheet. The optical film group 32c, the above-described optical film sheet group 32c is located on the diffusion plate 32b. The lamp group 33 is arranged above the back frame 31, which may be a cold cathode fluorescent tube or a light emitting diode, and the back frame 31 may be made of galvanized steel, aluminum or other sheet metal materials. It can be an effective frame structure for plastic injection.

In the present invention, the reflective sheet portion is extended and fitted in the back frame such that the partially extended reflective sheet can pass through the opening to the outside of the backlight module to fix the wire. That is, the present invention utilizes a portion of the reflective sheet to hold the wire.

Referring to FIG. 3A, a partial view of the backlight module 4 of the first embodiment of the present invention is shown. The backlight module 4 includes at least a back frame 41, a first optical film 42 and at least one wire 43. The back frame 41 includes a bottom plate 411 and a side wall 412 extending upward from the periphery of the bottom plate 411 to form an accommodating space for arranging the aforementioned lamp tube group 33 (please refer to the second figure), and the side wall 412 of the back frame 41 There is at least one opening 413 thereon. The first optical film 42 is disposed on the bottom plate 411 and extends upward along the sidewall 412. The wire 43 is located outside the back frame 41, and a portion of the first optical film 42a extends through the opening 413 in the side wall 412 to the outside of the back frame 41 to fix the wire 43. In particular, the optical film 42 described above may be a reflective sheet. The wire 43 is a flexible cable connecting the backlight module and the liquid crystal display panel to transmit the signal of the liquid crystal display panel. In addition, the wire 43 can also be a feedback signal wire for connecting the low voltage end circuit of the lamp to the transformer, and detecting the current in the lamp by the feedback signal returned by the lamp to control a power source. The device performs feedback compensation of the drive current to maintain a stable output of the lamp. However, the type of the wire 43 is not limited to one of the flexible cable or the feedback signal wire, and may be any wire connecting the backlight module and other components of the liquid crystal display.

In a preferred embodiment, the side wall 412 can be divided into a first portion 4121 and a second portion 4122. Referring to FIG. 3A, the first portion 4121 and the second portion are respectively shown in the figure. Section 4122. The first portion 4121 extends upward from the periphery of the bottom plate 411, and the second portion 4122 is coupled to the first portion 4121 and extends in a direction toward the outside of the back frame 41.

The opening 413 is located on the second portion 4122, and the first optical film 42 disposed on the bottom surface 411 extends along the inner surface of the first portion 4121 to the upper surface of the second portion 4122 and passes through the opening. The 413 extends to the outside of the back frame 41. As shown, after the partially extended first optical film 42a passes through the opening 413, it can span the wire 43 wound around the outside of the back frame 41 and be fixed to the outer side surface of the first portion 4121. It should be noted that the position of the opening 413 is not limited to a specific position on the second portion 4122, and only needs to be disposed at a corresponding position where the fixing wire 43 is to be attached. In addition, the length of the opening 413 is adjusted in accordance with the width of the partially extended first optical film 42a. That is, if the strength of the fixing of the wire 43 is to be strengthened, the area of the first optical film 42 attached to the outer surface of the first portion 4121 must be relatively increased, and the length of the opening 413 and the shape of the opening 413 must be increased. Not limited to any form.

According to the embodiment of FIG. B, the partially extended first optical film 42a passes through the opening 413 and spans the wire 43 located outside the back frame 41, and the wire 43 can also be bound under the second portion 4122. surface.

Referring to the fourth figure, a partial view of a backlight module 4 according to a second embodiment of the present invention is shown. The structure shown in the fourth figure is substantially the same as that of the third A or the third B, that is, the back frame 41, the first optical film 42 and the wire 43 are also included, the only difference being that the openings 413 are disposed at different positions. The structural difference described above is as follows: the opening 413 is located on the first portion 4121, and the first optical film 42 disposed on the bottom plate 411 extends along the inner side surface of the first portion 4121 to the second portion 4122. The surface extends partially through the opening 413 to the outside of the back frame 41. Subsequently, the partially extended first optical film 42a can fix the wire 43 to the outer side surface of the first portion 4121, and the manner of attaching and fixing is the same as that of the first embodiment, and details are not described herein.

Next, please refer to FIG. 5A to FIG. 5B, which are partial views of the backlight module 4 according to the third embodiment of the present invention. The structure shown in the fifth A to fifth B is substantially the same as that of the third A or the third B, that is, the back frame 41, the first optical film 42 and the wire 43 are also included, and the only difference is that the opening is The 413 is disposed at a different position, and the structural difference is as follows: the opening 413 is located on the bottom plate 411, and the first optical film 42 disposed on the bottom plate 411 is partially extended to the outside of the back frame 41 by the opening 413. Subsequently, the partially extended first optical film 42a can fix the wire 43 to the outer side surface of the bottom plate 411 as shown in FIG. The manner of attaching and fixing is the same as that of the first embodiment, and will not be described herein.

Thus, in light of the above description, it will be appreciated that the present invention directly utilizes the extension of the first optical film 42 to secure the wire. Moreover, the present invention directly uses the original first optical film 42 and the first optical film 42 extends upward along the sidewall 412, so that the sidewall 412 and the bottom plate 411 of the backlight module 4 are not involved. The angle of the clip is a vertical angle or greater or less than the vertical angle, and can be applied according to the cross-sectional schematic view of the frame of the embodiment shown in FIG.

Finally, it can be appreciated that the advantages of the present invention over conventional techniques are:

(1) Since the present invention directly uses the extension portion of the original first optical film 42 to fix the wire, the amount of the attached material or the fixing material can be effectively reduced, and since no new component is added, It also does not affect the space utilization of the institutional design.

(2) The first optical film 42 is partially extended to the outside of the back frame 41 to fix the wire 43. This design does not affect the cost of the upstream supply molding tool, so the actual backlight module can be effectively reduced. cost.

The present invention has been described above by way of a preferred example, but it is not intended to limit the spirit of the invention and the inventive subject matter. Those of ordinary skill in the art will readily recognize and utilize other elements or means to produce the same. Modifications made within the spirit and scope of the invention are intended to be included within the scope of the appended claims.

1. . . LCD Monitor

11. . . Module frame

12. . . LCD panel

13, 3, 4. . . Backlight module

14. . . Soft cable

15. . . Feedback signal wire

16. . . transformer

2. . . Wire fixing device

twenty one. . . tape

twenty two. . . Fixed seat

32. . . Optical film set

32a. . . A reflective sheet

32b. . . Diffusion sheet

32c. . . Optical film sheet set

33. . . Lamp

34. . . Backlight module upper frame

131, 31, 41. . . Back frame

411. . . Bottom plate

412. . . Side wall

4121. . . first part

4122. . . the second part

413. . . Opening

42. . . First optical film

42a. . . Partially extended first optical film

43. . . Wire

The first A diagram is a schematic diagram of the components of the conventional liquid crystal display;

The first B diagram is a partial view of the wire fixing device in the conventional liquid crystal display;

The second figure is a partial view of a conventional direct type backlight module;

3A to 3B are schematic cross-sectional views of a backlight module according to a first embodiment of the present invention;

Figure 4 is a partial view of a backlight module according to a second embodiment of the present invention;

5A to 5B are partial views of a backlight module according to a third embodiment of the present invention;

Figure 6 is a partial view of a frame of an embodiment of the present invention.

4. . . Backlight module

41. . . Back frame

411. . . Bottom plate

412. . . Side wall

4121. . . first part

4122. . . the second part

413. . . Opening

42. . . First optical film

42a. . . Partially extended first optical film

43. . . Wire

Claims (26)

A backlight module includes: a back frame, a bottom plate and a side wall extending upward from a periphery of the bottom plate, wherein the back frame has at least one opening; a first optical film disposed on the bottom plate, and And extending along the sidewall; and the at least one wire is located outside the back frame, wherein the first optical film is a reflective sheet extending to the outside of the back frame by the opening on the back frame, Secure the wire. The backlight module of claim 1, wherein the back frame is a galvanized steel sheet, an aluminum sheet or other alloy sheet metal material. The backlight module of claim 1, wherein the side wall is divided into a first portion and a second portion, the first portion is extended upward from the periphery of the bottom plate, and the second portion is coupled to the first portion And extending in a direction toward the outside of the back frame. The backlight module of claim 3, wherein the opening is located on the first portion, and the first optical film is fixed to the first portion by the opening. The backlight module of claim 3, wherein the opening is located on the second portion, and the first optical film is fixed to the second portion by the opening. The backlight module of claim 3, wherein the opening is disposed on the second portion, and the first optical film is fixed to the first portion by the opening. The backlight module of claim 1, wherein the opening is disposed on the bottom plate, and the first optical film fixes the wire to the outside of the bottom plate by the opening. The backlight module of claim 1, wherein the back frame further has an accommodating space formed by the bottom plate and the side wall surrounding the periphery of the bottom plate. The backlight module of claim 8, further comprising a plurality of light sources arranged at intervals in the accommodating space. The backlight module of claim 1, wherein the wire is a flexible cable (FFC). The backlight module of claim 1, wherein the wire is a feedback signal wire. The backlight module of claim 9, further comprising: a second optical film located above the light source; and a third optical film on the second optical film. The backlight module of claim 12, wherein the second optical film is a diffusion sheet, and the third optical film is a light collecting sheet. The backlight module of claim 9, wherein the light source is a cold cathode fluorescent tube or a light emitting diode. A liquid crystal display device comprising: a liquid crystal display panel; and a backlight module, comprising: a back frame comprising a bottom plate and a side wall extending upward from a periphery of the bottom plate, and the back frame Having at least one opening; a first optical film disposed on the bottom plate and extending upward along the sidewall; and at least one wire connecting the backlight module and other components of the liquid crystal display, and located at the back frame The outer side, wherein the first optical film is a reflective sheet extending to the outer side of the back frame by the opening on the side wall to fix the wire. The liquid crystal display device of claim 15, wherein the side wall is divided into a first portion and a second portion, the first portion is extended upward from the periphery of the bottom plate, and the second portion is coupled to the first portion And extending in a direction toward the outside of the back frame. The liquid crystal display device of claim 16, wherein the opening is located on the first portion, and the first optical film is fixed to the first portion by the opening. The liquid crystal display device of claim 16, wherein the opening is located on the second portion, and the first optical film is fixed to the second portion by the opening. The liquid crystal display device of claim 16, wherein the opening is disposed on the second portion, and the first optical film is fixed to the first portion by the opening. The liquid crystal display device of claim 15, wherein the opening is disposed on the bottom plate, and the first optical film fixes the wire to the outside of the bottom plate by the opening. The liquid crystal display device of claim 15, wherein the back frame further has an accommodating space formed by the bottom plate and the side wall surrounding the periphery of the bottom plate. The liquid crystal display device of claim 21, further comprising a plurality of light sources arranged at intervals in the accommodating space. The liquid crystal display device of claim 15, wherein the wire is a flexible cable (FFC). The liquid crystal display device of claim 15, wherein the wire is a feedback signal wire. The liquid crystal display device of claim 22, further comprising: a second optical film located above the light source; and a third optical film on the second optical film. The liquid crystal display device of claim 22, wherein the second optical film is a diffusion sheet, and the third optical film is a concentrating sheet or a diffusion sheet or a plurality of diffusions. An optical film sheet set with a sheet or a collection of light sheets and a diffusion sheet.