TWI785859B - Backlight module and display device - Google Patents

Abstract

A backlight module and a display device. The backlight module includes a frame, a light source module is arranged in an accommodating space of the frame, and an optical film set is arranged above the light source module and is located in the accommodating space. A light conversion element is arranged on the side of the side wall facing the light source, and the light conversion element can be converted into white light by the light emitted by the light source. The backlight module and the light conversion part of the display device on the side wall of the present invention can withstand impact tests or long-term use, and are not easy to fall off.

Description

Backlight module and display device

The present invention relates to a display technology, and in particular to a backlight module and a display device with the backlight module.

At present, the design trend of the display device is developing from the previous bulky and heavy appearance to the direction of thinning and light weight, and the frame width of the display device is gradually tending to the design of the narrow frame, so that the overall volume of the display device is reduced and the same size The area of the display picture that can be seen under the display device is larger, and the visual effect is better.

Among them, the direct-lit backlight module arranges a plurality of light-emitting diodes in an array, and places them behind a diffuser plate and a Liquid-Crystal Display (LCD) to directly illuminate the LCD. In this way, the direct-lit backlight module can quickly fine-tune the brightness of the light-emitting diodes according to the brightness changes of different parts of the screen, greatly improving the dynamic contrast ratio to the best level.

In the case of narrow frame design, the frame of the display device can no longer provide the function of shielding unexpected light, so the backlight module will produce light leakage or halo around the frame. When using a blue light emitting diode (Light Emitting Diode, LED) as a light source, the blue light is converted into white light through the wavelength conversion film in the optical film group. Thin coating thickness or encapsulation problems make the blue light conversion efficiency at the edge low, and then blue light leakage or blue halo will occur around the display area, so the image of the liquid crystal display device will have the problem of edge bluishness .

In order to solve the problem of the blue edge of the direct type backlight module, the current method is to print yellow ink on the bottom of the film or on other optical films, but because the surface of the optical film is smooth, Products with ink printed on the film will fall off after the impact drop test, so it is still easy to produce blue light leakage or blue halo around the display area.

The object of the present invention is to provide a backlight module and a display device, which are used to improve the peripheral blue halo and the light conversion element is not easy to fall off.

In order to achieve the above object, the present invention provides a backlight module, a frame, the frame includes a side wall, the side wall frame surrounds an accommodating space, the frame has at least one first joint portion; a light source module is arranged on In the accommodating space, the light source module includes a substrate and a plurality of light sources arranged on the substrate; an optical film group is arranged above the light source module and is located in the accommodating space, wherein the optical The diaphragm group has at least one second joint part combined with the corresponding first joint part; a light conversion part is arranged on the side of the side wall facing the light source, and the light conversion part can receive the light emitted by the light source. The light is converted to white light.

As a preferred manner, the height of the light conversion element is not less than the thickness of the light source module.

As a preferred manner, the height of the light conversion element is not less than the thickness of the combination of the light source module and the optical film set.

As a preferred manner, the light source module further includes an encapsulant, the encapsulant covers the light source and forms a main light-emitting surface and a light-emitting side, the light-emitting side faces the light conversion element, and the height of the light conversion element is not less than the height of the light emitting side.

As a preferred manner, the first combination part is a plurality of grooves on the side wall, the second combination part of the optical film set is a plurality of lugs, and the lugs are correspondingly combined with the grooves.

As a preferred manner, the frame also includes a board, the side wall is arranged at the periphery of the board, the first joint part is at least one protrusion extending upward from the board, and the second joint part of the optical film group It is at least one perforation, and the perforation is correspondingly combined with the protrusion.

As a preferred manner, the light conversion element is arranged on the side wall around the optical film group and at least one notch is formed, and the position of the notch corresponds to the joint position of the first joint part and the second joint part.

As a preferred manner, there is a gap between the light converting element and the optical film group.

In order to achieve the above object, the present invention provides a display device, the structure of which includes: the aforementioned backlight module, and a liquid crystal panel, the liquid crystal panel is arranged above the optical film group, and the liquid crystal panel is supported by the side wall top surface.

Compared with the prior art, the backlight module of the present invention and the light conversion element on the side wall of the display device can withstand the impact test or long-term use, and the light conversion element is not easy to fall off.

100: Backlight module

200: frame

210: plate body

220: side wall

230:Accommodating space

240: The first junction

241: Groove

242: convex column

300: Light source module

310: Substrate

320: light source

330: encapsulation glue

331: Main light-emitting surface

332: Luminous side

333: Light Conversion Particles

400:Optical diaphragm group

410: the second junction

411: lug

412: perforation

500, 500a: light conversion parts

510, 510a: Gap

600: display panel

700: display device

L: light

[FIG. 1] is a schematic diagram of the backlight module of the embodiment of the present case.

[ FIG. 2 ] is a schematic cross-sectional view of the backlight module of the embodiment of the present case.

[ FIG. 3 ] is a schematic diagram of a backlight module of another embodiment of the present case.

[Fig. 4] The first cross-sectional schematic diagram of the backlight module with encapsulant for the light source module in this case.

[Fig. 5] The second schematic cross-sectional view of the backlight module with encapsulant for the light source module in this case.

[ FIG. 6 ] is a schematic diagram of a display device in an embodiment of the present case.

The embodiments of the present invention are described in detail below in conjunction with the drawings. The attached drawings are mainly simplified schematic diagrams, which only schematically illustrate the basic structure of the present invention. Therefore, only components related to the present invention are marked in these drawings. , and the displayed components are not drawn according to the number, shape, size ratio, etc. of the actual implementation. The actual size of the actual implementation is a selective design, and the layout of the components may be more complicated.

The following descriptions of the various embodiments refer to the accompanying drawings to illustrate specific embodiments in which the present invention may be practiced. The directional terms mentioned in the present invention, such as "up", "down", "Front", "rear", etc. are merely directions for referring to the attached drawings. Therefore, the directional terms used are used to illustrate and understand the application, but not to limit the application. Also, in the specification, unless it is clearly described to the contrary, the word "comprising" will be understood as meaning including the stated elements, but not excluding any other elements.

Please refer to FIG. 1 and FIG. 2 , which are schematic diagrams and cross-sectional diagrams of the backlight module of the present invention. A backlight module 100, the backlight module 100 includes: a frame 200, a light source module 300 placed in the frame 200, an optical film group 400 placed on the light source module 300, and a light conversion The component 500 is arranged on the side of the frame 200 facing the light source module 300, and the light conversion component 500 does not overlap or scratch with other components, so the light conversion component 500 can withstand the impact test or long-term In use, the problem of falling off of the light conversion element 500 is not easy to occur.

The frame 200 includes a plate body 210 and a side wall 220 disposed on the periphery of the plate body 210 , the plate body 210 and the side wall 220 form an accommodating space 230 , and the frame 200 has at least one first joint portion 240 . In practice, the frame 200 can be a part of the front frame, plastic frame or metal backboard, and the side wall 220 can be a side formed by extending toward the light source 320 in the front frame, plastic frame or metal backboard, and does not This is the limit. The frame 200 in this embodiment is a metal backboard, and the side wall 220 extends upward from the edge of the metal backboard.

The light source module 300 includes a substrate 310, and a plurality of light sources 320 disposed on the substrate 310, wherein the substrate 310 is disposed on the board body 210; the light sources 320 are light-emitting diodes (Light-Emitting Diode, LED), but it can also be other kinds of light emitting elements. The light source 320 may be an unpackaged light-emitting chip cut directly from a wafer, such as a light-emitting diode chip. The diode chip is suitable for providing blue light, but not limited thereto.

The optical film set 400 is disposed above the light source module 300 and located in the accommodating space 230, wherein the optical film set 400 has at least one second joint portion 410 corresponding to the first A joint part 240 is combined. The backlight module 100 of this embodiment is a direct type backlight module, and the optical film set 400 may include optical films such as a diffusion plate and a wavelength conversion film.

The light conversion element 500 is disposed on the inner surface of the side wall 220 , facing the side of the light source 320 , and the light conversion element 500 can be converted into white light by the light L emitted by the light source 320 . In terms of implementation, when the light L emitted by the light source 320 is blue light, the light conversion element 500 is yellow ink, or the light conversion element 500 is yellow phosphor powder, which can be excited by blue light to emit white light, but This is not the limit. Because the optical film set 400 is located in the accommodating space 230 surrounded by the side wall 220, when the light conversion element 500 is arranged on the inner surface of the side wall 220, the optical film set 400 will be separated from the edge The emitted light L is converted into white light, thereby reducing the bluish phenomenon of light leakage at the edge of the light source module 100 . Compared with the conventional technology, the optical film group is carried by the side wall and protrudes out of the accommodation space. This design cannot allow the light emitted from the edge of the optical film group to be converted into white light, and it is still prone to edge bluishness Phenomenon.

In the backlight module 100 of this embodiment, by disposing the light converting member 500 on the surface between the inner surface of the side wall 220 and the light source module 300, when the light L of the light source 320 is transmitted to the backlight module 100 , part of the light that does not pass through the optical film set 400 will be converted by the light conversion element 500 into complementary light colors. When the light source 320 emits blue light, the arrangement of the light converting element 500 can reduce the bluish phenomenon caused by light leakage from the edge of the backlight module 100 . In addition to the purpose of solving the color shift problem, the light conversion element 500 of this embodiment can avoid the light conversion element 500 (yellow ink or yellow fluorescent powder) by changing the position of the light conversion element 500. The problem of falling off and failing. More specifically, the light conversion element 500 in the backlight module 100 of this embodiment is located on the side wall 220 of the frame 200, and the light conversion element 500 will not overlap with other components or cause scratches, so the light The surface of the conversion member 500 will not fall off due to the friction of relative displacement. For example, the substrate 310 of the light source module 300 on the board 210 is fixedly arranged on the surface of the board 210, for example, attached between the board 210 and the substrate 310 with a double-sided adhesive tape, thus, The light source model The substrate 310 of the set 300 will not scratch the surface of the light conversion element 500 .

In practical application, the light conversion member 500 surrounds the periphery of the light source module 300 and the optical film set 400, the height of the light conversion member 500 is preferably not less than the thickness of the light source module 300, or the light conversion member The height of 500 is not less than the combined thickness of the light source module 300 and the optical film set 400 . For example, the height of the light conversion element 500 can also be not less than the thickness of the light source module 300, as long as it can convert the bluish light from the light source module 300 due to insufficient light conversion efficiency into white light That's it. Moreover, as shown in FIG. 2, the combined thickness of the light source module 300 and the optical film set 400 is approximately equal to the height of the light conversion element 500. In a preferred implementation, the height of the light conversion element 500 is the same as that of the side wall 220 have the same height and completely surround the light source module 300 and the optical film set 400 . In this way, no matter from the light source module 300 or the optical film set 400 , bluish light due to insufficient light conversion efficiency can be converted into white light by the light conversion element 500 at the corresponding position. The thickness of the light conversion element 500 is adjusted according to the light L emitted by the light source 320 to achieve the best conversion effect.

In practical application, as shown in FIG. 1 , the first joint portion 240 is a plurality of grooves 241 located on the side wall 220 , the second joint portion 410 of the optical film set 400 is a plurality of lugs 411 , The lugs 411 are correspondingly combined with the grooves 241 for assembly and positioning of the optical film set 400 , as shown in FIG. 1 . In addition, the light conversion element 500 is arranged on the side wall 220 around the optical film group 400, so the light conversion element 500 is formed with at least one notch 510 corresponding to the groove 241 of the first joint part 240, and the notch The positions of the notches 510 correspond to the joint positions of the first joint part 240 and the second joint part 410 , that is, the positions of the notches 510 correspond to the joint positions of the groove 241 and the lug 411 . In other words, the optical film set 400 accommodated in the accommodating space 230 is mutually limited by the first joint portion 240 on the side wall 220 and the second joint portion 410 of the optical film set 400 For example, the groove 241 on the side wall 220 and the lug 411 of the optical film set 400 form a concavo-convex shape that cooperates with each other to complete the positioning of the optical film set 400 . Mutually Compared with the conventional ink coated on the optical film group, which is prone to surface scratches caused by sliding due to the overlapping of components, the light conversion element 500 of this embodiment is arranged on the side wall 220, and There will be no scratching problem, so it has better bonding stability, and it is not easy to fall off and lead to the failure of the means of improving color cast. In one embodiment, the depth of the aforementioned groove 241 may be smaller than the width of the lug 411, so that the edge of the optical film set 400 will not abut against the light conversion element 500, which can further ensure that the light conversion element 500 There will be no scratching and falling off between the optical film group 400 .

Please refer to FIG. 3 again. In another implementation, the first joint part 240 can also be two protrusions 242 extending upward from the plate body 210, and the second joint part 410 of the optical film set 400 is corresponding to the The perforations 412 of the protrusions 242 are correspondingly combined with the protrusions 242 for the assembly and positioning of the optical film set 400 . Similarly, since the light conversion element 500a is arranged on the side wall 220 around the optical film group 400, the preparation steps of the light conversion element 500a can be simplified; or, the light conversion element 500a corresponds to the first joint portion A notch 510a is formed at the position of the protrusion 242 of the 240, and the position of the notch 510a corresponds to the joint position of the first joint part 240 and the second joint part 410, that is, the position of the notch 510a corresponds to the position of the protrusion 242 and the second joint part 410. There are usually other mechanisms, such as a lens, in the combined position of the through hole 412 , so that light does not enter here, and therefore the light conversion element 500 does not need to be provided. In the embodiment shown in FIG. 3, since the optical film set 400 is positioned relative to the plate body 210, there is preferably a gap between the optical film set 400 and the side wall 220, and it can also be more It is further ensured that the light converting element 500 and the optical film set 400 will not be scratched and fall off.

Please refer to FIG. 4 and FIG. 5 , which are schematic cross-sectional views of the backlight module with encapsulant for the light source module in this case. In terms of implementation and application, as a preferred mode, the light source module 300 includes a plurality of light sources 320 and an encapsulation glue 330. The encapsulation glue 330 covers the light sources 320 and forms a main light emitting surface 331 and a light emitting side 332. The light emitting The side 332 faces the light converting element 500 . In one example, as shown in FIG. 5, the optical film group in the backlight module of the light source module with encapsulant can contain a wavelength The conversion film is used to convert the light emitted by the light source into white light; in another embodiment, as shown in FIG. The light is converted to white light. The encapsulant 330 for encapsulating the LED chips should ideally be transparent, so that the light emitted by the LED chips can fully penetrate and have high brightness. A part of the light emitted by the light sources 320 is transmitted to the optical film set 400 through the main light-emitting surface 331, and another part of the light is emitted from the light-emitting side 332, so that the blue light conversion efficiency at the edge is low, and then around the display area. There will be blue light leakage or blue halo, so the image of the liquid crystal display device will have the problem of bluish edges.

In the implementation and application of the present invention, the encapsulant 330 of the light source module 300 is fixed on the substrate 310, and the light conversion element 500 surrounds the periphery of the light source module 300 and the optical film group 400, more specifically , the light conversion element 500 is fixed on the side wall 220, so there will be no relative displacement between the light conversion element 500 and the light-emitting side 332 of the encapsulant 330 of the light source module 300, and the light conversion element 500 can be After directly receiving the blue light from the light-emitting side 332 and converting it into white light, the light conversion member 500 extends from the junction of the side wall 220 and the board body 210 toward the top of the side wall 220, or the light conversion member 500 extends from the The junction of the plate body 210 and the encapsulant 330 extends toward the main light-emitting surface 331, and the height of the light conversion element 500 is not less than the height of the light-emitting side 332 (as shown in FIG. 4 ); or the light conversion element 500 The height of the light-emitting side 332 and the optical film group 400 is approximately equal to the height (as shown in FIG. 5 ). The light source module 300 and the optical film set 400 . In this way, the light conversion element 500 can be converted into white light by the light emitted by the light source 320 from the light-emitting side 332 efficiently, and based on the light conversion element 500 being arranged on the side wall 220, the light conversion element 500 and Other components do not overlap or scratch, so it can ensure that the light conversion element 500 will not fall off due to scratches. Similarly, in practical applications, when the light L emitted by the light source 320 is blue light, the light conversion element 500 is yellow ink, or the light conversion element 500 is yellow ink. The phosphor powder can be excited by blue light to emit white light, but not limited thereto. The light conversion element 500 converts the light L emitted from the edge into white light, thereby reducing the bluish phenomenon of light leakage from the edge of the light source module 100 .

In summary, the positioning design of the groove 241 and the lug 411 as shown in FIG. 1 , and the positioning design of the protrusion 242 and the perforation 412 as shown in FIG. , or the fixed setting of the encapsulant 330 relative to the light conversion element 500 as shown in FIG. Rubbing causes the problem of falling off.

FIG. 6 is a schematic diagram of a display device in an embodiment of the present case. The aforementioned backlight module 100 is applied to a display device 700, including a display panel 600 and the aforementioned backlight module 100, the display panel 600 is arranged on the top of the optical film group 400, and the liquid crystal panel 600 rests on the side wall The top surface of 220 , that is, the display panel 700 is disposed above the backlight module 100 . The display device of this embodiment can be arranged on the side wall 220 by the light conversion element 500 in the aforementioned backlight module 100, wherein the frame of this embodiment can be a front frame, a plastic frame or a metal back plate, and the side wall 220 can be The side wall facing the light source 320 in the front frame, the plastic frame or the metal back plate is not limited thereto, so as to ensure that the light conversion element 500 still has better bonding stability after challenging tests or long-term use, The problem of falling off of the light converting element 500 is not easy to occur.

The backlight module of the present invention uses yellow ink or fluorescent powder to form light conversion parts on the side wall of the front frame, plastic frame or metal backplane. When the light is emitted from the edge of the backlight module, it does not pass through the optical film group. The light will be converted by the light color complementary of the light conversion element located on the side wall. When the light source emits blue light, the installation of light conversion parts can reduce the bluish phenomenon caused by light leakage at the edge of the backlight module; and the backlight module products have passed the impact drop test, and the light conversion parts are not easy to fall off. The display device can also effectively reduce the problem of bluish edges of displayed images.

The embodiments disclosed above are only illustrative of the principles, features and effects of the present invention, and are not intended to limit the scope of the present invention. Within the spirit and scope of the present invention, modifications and changes are made to the above-mentioned embodiments. Any equivalent change and modification accomplished by using the content disclosed in the present invention should still be covered by the scope of the following patent application.

100: Backlight module

200: frame

210: plate body

220: side wall

230:Accommodating space

240: The first junction

241: Groove

300: Light source module

310: Substrate

320: light source

400:Optical diaphragm group

410: the second junction

411: lug

500: Optical conversion parts

510: Gap

Claims (8)

A backlight module, comprising: a frame including a side wall, the side wall frame encloses an accommodating space, the frame has at least one first joint portion; a light source module is arranged in the accommodating space, the The light source module includes a substrate and a plurality of light sources arranged on the substrate; an optical film group is arranged above the light source module and located in the accommodation space, wherein the optical film group has at least one The second combination part is combined with the corresponding first combination part; and a light conversion element is arranged on the side of the side wall facing the light source, and the light conversion element can be converted into white light by the light emitted by the light source , wherein the light conversion element has a projection height on a projection surface, the light source module has a projection thickness on the projection surface, the projection height and the projection thickness coincide on the projection surface, and the light conversion element has a The projection height is not less than the projection thickness of the light source module. A backlight module, comprising: a frame including a side wall, the side wall frame encloses an accommodating space, the frame has at least one first joint portion; a light source module is arranged in the accommodating space, the The light source module includes a substrate and a plurality of light sources arranged on the substrate; an optical film group is arranged above the light source module and located in the accommodation space, wherein the optical film group has at least one The second combination part is combined with the corresponding first combination part; and a light conversion element is arranged on the side of the side wall facing the light source, and the light conversion element can be converted into white light by the light emitted by the light source , wherein the light conversion element has a projection height on a projection surface, the light source module has a first projection thickness on the projection surface, and the optical film group has a second projection thickness on the projection surface, The projection height and the first projection thickness and the second projection thickness are on the projection surface overlap, and the projected height of the light converting element is not less than the sum of the first projected thickness and the second projected thickness. The backlight module according to claim 1 or 2, wherein the light source module further includes a packaging glue, the packaging glue covers the light source and forms a main light-emitting surface and a light-emitting side, and the light-emitting side faces the The light conversion element, the height of the light conversion element is not less than the height of the light emitting side. The backlight module according to claim 1 or 2, wherein the first joint part is a plurality of grooves on the side wall, and the second joint part of the optical film set is a plurality of lugs, so The lugs are correspondingly combined with the grooves. The backlight module according to claim 1 or 2, wherein the frame further includes a board, the side wall is arranged at the periphery of the board, and the first joint part is at least one protrusion extending upward from the board, The second combining portion of the optical film set is at least one through hole, and the through hole is correspondingly combined with the protrusion. The backlight module according to claim 1 or 2, wherein the light conversion element is arranged on the side wall around the optical film group, and at least one notch is formed, and the position of the notch corresponds to the first combination part and the joint position of the second joint part. The backlight module as claimed in claim 1 or 2, wherein there is a gap between the light conversion element and the optical film set. A display device, comprising: a backlight module as described in any one of claims 1 to 7; and a liquid crystal panel, the liquid crystal panel is arranged above the optical film group, and the liquid crystal panel is supported by the the top surface of the side wall.

Images