JP3236201U - Backlight module and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a backlight module and a display device in which an optical conversion element is hard to fall off in order to improve halation of blue color on a peripheral edge.
A backlight module 100 includes a frame 200, a light source module 300 installed in the accommodation space of the frame, and an optical film sheet group 400 installed above the light source module and located in the accommodation space. And an optical conversion element 500 which is installed on the side of the side wall 220 toward the light source 320 and converts the light rays emitted from the light source into white light.
[Selection diagram] Fig. 1

Description

The present invention relates to display technology, and more particularly to a backlight module and a display device having the backlight module.

Currently, display device designs are becoming thinner and lighter than the conventional large volume and heavy appearance, and the frame of the display device tends to become narrower and narrower, which reduces the volume of the entire display device. At the same time, the area of the display screen on the display device of the same size becomes larger, and the visual effect is better.

Here, in the direct type backlight module, a plurality of light emitting diodes are arranged in a plurality of rows, arranged after the diffuser plate and the liquid crystal screen (Liquid Crystal Display, LCD), and directly irradiate the LCD. In this way, the direct backlight module can quickly fine-tune the brightness of the light emitting diode according to the change in brightness of different parts of the screen, greatly improving the dynamic contrast and reaching the optimum level. ..

In the case of a narrow frame design, the frame of the display device cannot provide the function of blocking unexpected light rays, so that light leakage or halation phenomenon may occur around the frame of the backlight module. When a blue light emitting diode (Light Emitting Diode, LED) is used as a light source, blue light is converted into white light via a wavelength conversion film in an optical film sheet group, but a phosphor having a thin edge of the wavelength conversion film is applied or applied. Depending on the package, the conversion efficiency of blue light at the edge is lowered, and further, blue light leakage or blue halation occurs around the display area, so that the blue phenomenon of the edge occurs in the image of the liquid crystal display device.

In order to solve the blue phenomenon of the edge of the direct type backlight module, yellow ink is printed under the prism sheet or on another optical film sheet by the conventional means, but because the surface of the optical film sheet is smooth, A product in which ink is printed on a film sheet may drop ink due to an impact drop test, and in this way, blue light leakage or blue halation is likely to occur around the display area.

An object of the present invention is to provide a backlight module and a display device in which a light conversion element for improving the halation of blue on the periphery is hard to fall off.

To achieve the above object, the present invention provides a backlight module, which includes a side wall surrounding the containment space and is installed in the containment space with a frame having at least one first joint. A light source module comprising a substrate and a plurality of light sources installed on the substrate, located above the light source module and located within the containment space, and coupled to the corresponding first coupling. It includes an optical film sheet group having at least one second coupling portion thereof, and an optical conversion element installed on the side wall of the side wall facing the light source and converting light emitted from the light source into white light.

Preferably, the height of the light conversion element is equal to or greater than the thickness of the light source module.

Preferably, the height of the optical conversion element is equal to or greater than the thickness of the bond between the light source module and the optical film sheet group.

Preferably, the light source module further comprises an adhesive, which covers the light source to form a main light emitting surface and a light emitting side surface, wherein the light emitting side surface faces the light conversion element. The height of the light conversion element is equal to or higher than the height of the light emitting side surface.

Preferably, the first joint is a plurality of concave grooves located on the side wall, the second joint of the optical film sheet group is a plurality of convex portions, and the convex portion is the said. It is coupled corresponding to the groove.

Preferably, the frame further comprises a plate body, the side wall is provided on the peripheral edge of the plate body, and the first joint portion is at least one convex column extending upward from the plate body. The second coupling portion of the optical film sheet group is at least one through hole, and the through hole is coupled corresponding to the convex column.

Preferably, the optical conversion element surrounds the optical film sheet group and is arranged on the side wall, and at least one notch is formed, and the position of the notch is the position of the first joint and the second joint. Corresponds to the connection position with the connection part.

Preferably, there is a gap between the optical conversion element and the optical film sheet group.

In order to achieve the above object, the present invention provides a display device, which is installed above the above-mentioned backlight module and the optical film sheet group, and is abutted against the top surface of the side wall. It is equipped with a liquid crystal panel.

Compared with the prior art, the optical conversion element located on the side wall of the backlight module and the display device according to the present invention can withstand an impact test or long-term use, and the optical conversion element is less likely to fall off.

FIG. 1 is a schematic diagram of a backlight module according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of the backlight module according to the embodiment of the present invention. FIG. 3 is a schematic diagram of a backlight module according to another embodiment of the present invention. FIG. 4 is a schematic first cross-sectional view of a backlight module including a light source module having the adhesive of the present invention. FIG. 5 is a second schematic cross-sectional view of a backlight module including a light source module having the adhesive of the present invention. FIG. 6 is a schematic diagram of a display device according to an embodiment of the present invention.

Hereinafter, examples of the present invention will be described in detail with reference to the drawings. The drawings are mainly simplified schematic views, and in order to schematically explain the basic structure of the present invention, only the parts related to the present invention are shown in the drawings, and the number of displayed parts is the number at the time of implementation. , Shape, dimensional ratio, etc. are not drawn, and the specified dimensions at the time of actual implementation are all selective designs, and the layout form of the component may be more complicated.

Hereinafter, the description for each embodiment exemplifies a specific embodiment in which the present invention can be carried out with reference to the drawings. Directional terms referred to in the present invention, such as "top", "bottom", "front", "rear", etc., refer only to the direction in the drawings. Accordingly, the directional terms used are used to explain and understand the present application and are not intended to limit the present application. Also, in the specification, unless explicitly stated in the opposite direction, the term "contains" is understood to mean including an element, but does not exclude any other element.

1 is a schematic diagram and a schematic cross-sectional view showing the backlight module of the present invention with reference to FIGS. 1 and 2. The backlight module 100 includes a frame 200, a light source module 300 arranged in the frame 200, an optical film sheet group 400 arranged in the light source module 300, and a side of the frame 200 facing the light source module 300. The optical conversion element 500 is provided with the optical conversion element 500 installed in the above, and the optical conversion element 500 does not overlap or rub between the optical conversion element 500 and other members, so that the optical conversion element 500 can withstand an impact test or long-term use. This makes it difficult for the optical conversion element 500 to fall off.

The frame 200 includes a plate body 210 and a side wall 220 installed on the peripheral edge of the plate body 210, and the plate body 210 and the side wall 220 form an accommodation space 230, and the frame 200 is at least. It has one first coupling portion 240. When implemented, the frame 200 may be part of a front frame, plastic frame or metal back plate, the side wall 220 extending towards a light source 320 of the front frame, plastic frame or metal back plate. It may be a side surface formed by the above method, and is not limited thereto. The frame 200 in this embodiment is a metal back plate, and the side wall 220 extends upward from the edge of the metal back plate.

The light source module 300 includes a substrate 310 and a plurality of light sources 320 installed on the substrate 310, where the substrate 310 is installed on the plate 210. The light source 320 is a light-emitting diode (LED), but may be another type of light-emitting element. The light source 320 may be a light emitting chip that is directly cut from one wafer and is not packaged, for example, a light emitting diode chip, and the light emitting diode chip is, for example, crystalline particle nitride having a main wavelength of blue light. A light emitting diode chip, i.e., suitable for, but not limited to, providing blue light.

The optical film sheet group 400 is installed above the light source module 300 and is located in the accommodation space 230, where the optical film sheet group 400 has at least one second coupling portion 410. However, the second coupling portion 410 is coupled to the corresponding first coupling portion 240. The backlight module 100 of this embodiment is a direct type backlight module, and the optical film sheet group 400 may include an optical film sheet such as a diffuser plate and a wavelength conversion film.

The light conversion element 500 is installed on the inner surface of the side wall 220 and faces the light source 320, and the light conversion element 500 can convert the light ray L emitted from the light source 320 into white light. In the case of implementation and application, if the light ray L emitted from the light source 320 is blue light, the light conversion element 500 is yellow ink, or the light conversion element 500 is a yellow phosphor and is excited by blue light. It is possible to emit white light, but the present invention is not limited to this. Since the optical film sheet group 400 is located in the accommodation space 230 surrounded by the side wall 220, when the optical conversion element 500 is installed on the inner surface of the side wall 220, from the edge of the optical film sheet group 400. By converting the emitted light beam L into white light, the blue phenomenon due to light ray leakage from the edge of the light source module 100 is reduced. On the other hand, the optical film sheet group in the prior art is supported by the side wall and protrudes to the outside of the accommodation space, and with such a configuration, the light beam emitted from the edge of the optical film sheet group can be converted into white light. However, the blue phenomenon of the edge is likely to occur.

In the backlight module 100 of this embodiment, by arranging the light conversion element 500 on the inner surface of the side wall 220 and the surface between the light source module 300, the light ray L of the light source 320 is the edge of the backlight module 100. When emitted to, a part of the light rays that do not pass through the optical film sheet group 400 are converted by the optical conversion element 500 by complementing the light color. When blue light is emitted from the light source 320, the blue phenomenon due to light leakage from the edge of the backlight module 100 can be reduced by installing the light conversion element 500. In addition to realizing the purpose of resolving the color shift, the light conversion element 500 of the present embodiment changes the position of the light conversion element 500 in the present embodiment to change the position of the light conversion element 500 (yellow ink or yellow phosphor). ) Can be prevented from dropping out and expiring. More specifically, the light conversion element 500 in the backlight module 100 of the present embodiment is located on the side wall 220 of the frame 200, and the light conversion element 500 does not overlap or rub against other members. The surface of the conversion element 500 does not fall off due to the friction of relative displacement. For example, the substrate 310 of the light source module 300 located on the plate 210 is fixedly installed on the surface of the plate 210, and for example, a double-sided tape is used between the plate 210 and the substrate 310. Attached, thus, the substrate 310 of the light source module 300 does not rub the surface of the light conversion element 500.

When implemented and applied, the light conversion element 500 surrounds the peripheral edges of the light source module 300 and the optical film sheet group 400, and the height of the light conversion element 500 is equal to or greater than the thickness of the light source module 300. Preferably, or the height of the optical conversion element 500 is equal to or greater than the thickness of the bond between the light source module 300 and the optical film sheet group 400. For example, the height of the light conversion element 500 may be greater than or equal to the thickness of the light source module 300, and if the bluish light rays from the light source module 300 are converted into white light due to insufficient conversion efficiency of the light rays. good. Further, as shown in FIG. 2, the thickness of the bond between the light source module 300 and the optical film sheet group 400 and the height of the optical conversion element 500 are substantially the same, and preferably, when implemented and applied, the said. The height of the optical conversion element 500 and the height of the side wall 220 are the same, and completely surround the light source module 300 and the optical film sheet group 400. As described above, regardless of the light source module 300 or the optical film sheet group 400, any bluish light beam 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 beam L emitted from the light source 320 to achieve the optimum conversion effect.

When implemented and applied, as shown in FIG. 1, the first joint is a plurality of concave grooves 241 located on the side wall 220, and the second joint 410 of the optical film sheet group 400 is a plurality. 411, the convex portion 411 is coupled corresponding to the concave groove 241 to perform positioning for assembling the optical film sheet group 400, and FIG. 1 is referred to. Further, since the optical conversion element 500 is arranged on the side wall 220 so as to surround the optical film sheet group 400, the optical conversion element 500 is located at a position corresponding to the concave groove 241 of the first coupling portion 240 of the optical conversion element 500. At least one notch 510 is formed, and the position of these notches 510 corresponds to the connection position between the first coupling portion 240 and the second coupling portion 410, that is, the position of these notches 510. Corresponds to the coupling position between the concave groove 241 and the convex portion 411. In other words, in the optical film sheet group 400 installed in the accommodation space 230, the first coupling portion 240 on the side wall 220 and the second coupling portion 410 of the optical film sheet group 400 are positioned at each other. For example, the position of the optical film sheet group 400 can be regulated by forming an uneven shape in which the concave groove 241 on the side wall 220 and the convex portion 411 on the optical film sheet group 400 match each other. On the other hand, when ink is applied to the conventional optical film sheet group, the surface is liable to be rubbed due to the members overlapping and sliding on each other. However, the optical conversion element 500 of the present embodiment has the side wall 220. Since it is installed in the water and does not rub, it has suitable bond stability and the means for improving color shift due to shedding is unlikely to expire. In one embodiment, the depth of the concave groove 241 is smaller than the width of the convex portion 411 so that the edge of the optical film sheet group 400 does not abut on the optical conversion element 500, whereby the optical conversion It is possible to further ensure that the element 500 and the optical film sheet group 400 do not rub against each other and fall off.

Further, when another implementation and application is made with reference to FIG. 3, the first joint portion 240 may be two convex columns 242 in which the plate body 210 extends upward, and the optical film sheet may be used. The second connecting portion 410 of the group 400 is a through hole 412 corresponding to these convex columns 242, and the through hole 412 is connected corresponding to the convex column 242 to assemble the optical film sheet group 400. Positioning for. Similarly, the optical conversion element 500a is arranged on the side wall 220 so as to surround the optical film sheet group 400, and thus the manufacturing process of the optical conversion element 500a can be simplified or the light can be simplified. A notch 510a is formed at a position corresponding to the convex column 242 of the first coupling portion 240 of the conversion element 500a, and the position of the notch 510a is the position of the first coupling portion 240 and the second coupling portion 410. The light beam does not enter here because it generally has another mechanism such as a lens at the position corresponding to the connection position of the notch 510a, that is, the connection position between the convex column 242 and the through hole 412 of the notch 510a. Therefore, it is not necessary to install the optical conversion element 500. In the embodiment shown in FIG. 3, in order to position the optical film sheet group 400 with respect to the plate body 210, it is preferable that the optical film sheet group 400 has a gap between the optical film sheet group 400 and the side wall 220. It is possible to further ensure that the optical conversion element 500 and the optical film sheet group 400 do not rub against each other and fall off.

4 is a schematic cross-sectional view showing a backlight module including a light source module having the adhesive of the present invention with reference to FIGS. 4 and 5. When implemented and applied, preferably the light source module 300 comprises a plurality of light sources 320 and an adhesive 330, the adhesive 330 covering the light source 320 to form a main light emitting surface 331 and a light emitting side surface 332. The light source side surface 332 faces the light conversion element 500. In one example, as shown in FIG. 5, the optical film sheet group in the backlight module including the light source module having the adhesive of the present invention is wavelength conversion for converting the light ray emitted from the light source into white light. A film may be included. In another embodiment, as shown in FIG. 4, the adhesive 330 may include photoconverting particles 333 for converting light rays emitted from a light source into white light. The adhesive 330 for packaging the light emitting diode crystal particles is preferably transparent so that the light emitted from the light emitting diode crystal particles is completely transmitted and has high brightness. Some light rays emitted from these light sources 320 are emitted from the main light emitting surface 331 to the optical film sheet group 400, and some other light rays are emitted from the light emitting side surface 332 at the edge. Since the conversion efficiency of blue light is reduced and blue light leakage or blue halation occurs around the display area, there is an edge blue phenomenon in the image of the liquid crystal display device.

In the implementation and application of the present invention, the adhesive 330 of the light source module 300 is fixed to the substrate 310, and the light conversion element 500 surrounds the peripheral edges of the light source module 300 and the optical film sheet group 400, and is described in more detail. Since the light conversion element 500 is fixed to the side wall 220, no relative displacement occurs between the light conversion element 500 and the light emitting side surface 332 of the adhesive 330 of the light source module 300, and the light is emitted. The conversion element 500 can directly receive the blue light from the light emitting side surface 332 and convert it into white light, and the light conversion element 500 is formed from the boundary between the side wall 220 and the plate body 210 to the top end of the side wall 220. The light conversion element 500 extends toward the main light emitting surface 331 from the boundary between the plate body 210 and the adhesive 330, and the height of the light conversion element 500 extends toward the main light emitting surface 331. It is equal to or higher than the height of the side surface 332 (as shown in FIG. 4), or the height of the light conversion element 500 is the height of the light emitting side surface 332 and the optical film sheet group 400 (as shown in FIG. 5). It is substantially identical, preferably when implemented and applied, the height of the optical conversion element 500 is identical to the height of the side wall 220 and completely surrounds the light source module 300 and the optical film sheet group 400. As described above, the light conversion element 500 efficiently converts the light rays emitted from the light emitting side surface 332 by the light source 320 into white light, and the light conversion element 500 is installed on the side wall 220. Since the light conversion element 500 does not overlap or rub against other members, it is possible to ensure that the light conversion element 500 does not rub and fall off. Similarly, in the case of implementation and application, when the light L emitted from the light source 320 is blue light, the light conversion element 500 is yellow ink, or the light conversion element 500 is a yellow phosphor and is blue. It is possible to emit white light excited by light, but the light conversion element 500 is not limited to this, and the light conversion element 500 converts the light beam L emitted from the edge into white light, so that the light source module 100 can emit white light. Reduces the blue phenomenon caused by light leakage at the edges.

According to the above, the configuration of the positioning of the concave groove 241 and the convex portion 411 in FIG. 1, the configuration of the positioning of the convex column 242 and the through hole 412 in FIG. 3, and the gap between the optical conversion element 500 and the optical film sheet group 400. Having or fixing the adhesive 330 in FIG. 4 to the optical conversion element 500 ensures that any member does not cause relative displacement with respect to the surface of the optical conversion element 500. This is a means for ensuring that the optical conversion element 500 does not rub off and fall off.

FIG. 6 is a schematic diagram of a display device according to an embodiment of the present invention. The display device 700 using the backlight module 100 includes a display panel 600 and the backlight module 100, the display panel 600 is installed above the optical film sheet group 400, and the display panel 600 is the display panel 600. The display panel 600 is abutted against the top surface of the side wall 220, that is, the display panel 600 is installed above the backlight module 100. In the display device of this embodiment, the optical conversion element 500 of the backlight module 100 described above is installed on the side wall 220, where the frame of this embodiment may be a front frame, a plastic frame, or a metal back plate. The side wall 220 may be the side of the front frame, plastic frame or metal back plate towards the light source 320, without limitation, and the light conversion element 500 may be after testing or long-term use. Also has good coupling stability, and it is ensured that the problem of the optical conversion element 500 falling off is unlikely to occur.

The backlight module of the present invention utilizes yellow ink or a phosphor to form a light conversion element on the side wall of a front frame, a plastic frame or a metal back plate, and when light rays are emitted from the edge of the backlight module, it is optical. Light rays that do not pass through the film sheet group are converted by the optical conversion element located on the side wall by complementing the light color. When blue light is emitted from the light source, the blue phenomenon due to light leakage at the edge of the backlight module can be reduced by installing a light conversion element, and the backlight module product can withstand the impact drop test. Therefore, the optical conversion element is less likely to fall off, and the blue phenomenon at the edge of the displayed image in the display device can be reduced.

The embodiments disclosed above are merely for exemplifying the principles, features and effects of the present invention, and do not limit the feasible scope of the present invention, and are familiar with this technique. Anyone who has the above-mentioned embodiments can be modified and modified without departing from the spirit and scope of the present invention. Any equivalent modifications and modifications completed using the contents disclosed in the present invention should also be included in the appended claims.

100 ... Backlight module 200 ... Frame 210 ... Plate 220 ... Side wall 230 ... Containment space 240 ... First joint 241 ... Concave groove 242 ... Convex pillar 300 ... Light source module 310 ... Board 320 ... Light source 330 ... Adhesive 331 ... Main light emitting surface 332 ... Light emitting side surface 333 ... Optical conversion particles 400 ... Optical film sheet group 410 ... Second coupling portion 411 ... Convex portion 412 ... Through holes 500, 500a ... Optical conversion element 510 ... 510a ... Notch 600 ... Display panel 700 ... Display device L ... Ray

Claims (5)

A frame comprising a side wall surrounding the containment space and having at least one first joint.
A light source module installed in the accommodation space and including a substrate and a plurality of light sources installed on the substrate.
An optical film sheet group that is installed above the light source module and is located in the accommodation space and has at least one second coupling portion that couples with the corresponding first coupling portion.
A backlight module, which is installed on the side of the side wall facing the light source and includes an optical conversion element that converts light rays emitted from the light source into white light. The light source module further comprises an adhesive, which covers the light source to form a main light emitting surface and a light emitting side surface, the light emitting side surface facing the light conversion element, and the light conversion element. The backlight module according to claim 1, wherein the height of the light emitting surface is equal to or higher than the height of the light emitting side surface. The first joint portion is a plurality of concave grooves located on the side wall, the second joint portion of the optical film sheet group is a plurality of convex portions, and the convex portion is formed in the concave groove. The backlight module according to claim 1 or 2, wherein they are coupled correspondingly. The frame further includes a plate body, the side wall is provided on the peripheral edge of the plate body, and the first joint portion is at least one convex column extending upward from the plate body, and the optical film sheet. The backlight module according to claim 1 or 2, wherein the second connecting portion of the group is at least one through hole, and the through hole is connected corresponding to the convex column. The backlight module according to any one of claims 1 to 4.
A display device provided with a liquid crystal panel installed above the optical film sheet group and abutted on the top surface of the side wall.

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