CN219609390U - Backlight module and display device - Google Patents

Abstract

The embodiment of the utility model discloses a backlight module and a display device, comprising a backboard, wherein the backboard comprises a containing cavity, a backlight source and a display module, wherein the backlight source is positioned in the containing cavity and is configured to provide light; the light guide plate is positioned in the accommodating cavity and comprises a light incident surface for incident light emitted by the backlight source, a light emergent surface for emergent light, a first reflecting surface opposite to the light emergent surface, and a plurality of second reflecting surfaces connected with the first reflecting surfaces and the light emergent surface, wherein the light emergent side of the backlight source faces the light incident surface of the light guide plate, and the second reflecting surfaces cover the second leakage-preventing layer; the fluorescent film is arranged in the accommodating cavity and is positioned on one side, far away from the back plate, of the light guide plate, the fluorescent film covers the light emitting surface, the peripheral edge of the fluorescent film is covered with a first leakage-preventing layer, and the first leakage-preventing layer is configured to absorb light at the edge of the fluorescent film. The edge brightness of the backlight module is ensured, and meanwhile, the blue light leakage generated at the edge of the backlight module is avoided.

Description

Backlight module and display device

Technical Field

The utility model relates to the technical field of display. And more particularly, to a backlight module and a display device.

Background

At present, fluorescent film backlight products have larger application prospects in the fields of medium-high-end LCD and MiniLED by virtue of the characteristics of eye protection, high color gamut, good image quality, strong stereoscopic impression, strong contrast ratio and the like. The fluorescent film backlight product is characterized in that a lower diffusion sheet in a backlight module of a common LCD product is replaced by a fluorescent film, and a white light LED in a backlight source is replaced by a blue light LED, so that the color purity and the color saturation of LCD display can be improved, and the fluorescent film backlight product has the advantages of high color gamut, good image quality, strong stereoscopic impression, strong contrast and the like. However, based on the special properties of quantum dots and the like, when the size of particles reaches the nanometer level, size effects, quantum confinement effects, macroscopic quantum tunneling effects and surface effects can be generated. Among them, the quantum dot size effect plays a very important role in the display field: the different sizes of the quantum dots are precisely controlled, when the quantum dots are excited by external energy, light with corresponding wavelength can be emitted, so that the quantum dot material can realize high-purity RGB primary colors, and the three primary colors have uniform spectral distribution. The fluorescent film is the product of such quantum dot materials.

However, due to poor edge barrier property of the fluorescent film, after long-time placement or module reliability test, under the conditions of water, heat, light, oxygen and the like, the quantum dots at the edge of the fluorescent film are easy to generate photooxidation, thermal decomposition and other phenomena, so that local failure is caused, a failure edge is formed, blue light leaks from the edge of the fluorescent film, and the edge of a display area is reddish, so that the overall picture quality is very influenced. However, due to the barrier effect of the inner adhesive layer of the film, the permeation speed of water molecules and oxygen molecules is gradually reduced, so that the failure edge extends inwards from the edge and is basically stopped after reaching a certain size. The final size of the failure edge is related to the water-oxygen barrier property of the quantum dot adhesive layer, and the redness degree of the failure edge depends on the influence of aging conditions and aging time on the quantum dot.

Aiming at the problems, the problems are generally improved by adopting the modes of widening the inner side of the shading adhesive tape, coating the lower surface of the shading adhesive tape and the reflecting sheet with gradual change yellow fluorescent powder, a yellow adhesive frame and the like, but the problems are solved by adopting the schemes that the influence of a failure edge is reduced by absorbing blue light, the brightness of the edge of a module can be influenced, and still a lot of blue light is leaked. Fig. 1 is a schematic diagram of a conventional backlight module design, and fig. 2 is a schematic diagram of a conventional backlight module with blue light leakage. The lower surface of the shading adhesive tape and the upper surface of the reflecting sheet are coated with gradual change yellow fluorescent powder, the adhesive frame is a yellow adhesive frame, when blue light is emitted from the left side and the right side of the light guide plate, the blue light reaches the surface of the adhesive frame, and after being reflected by the surface of the adhesive frame, the blue light is upwards spread from a gap between the fluorescent film and the adhesive frame to form backlight edge leakage. The fluorescent powder on the lower surface of the yellow rubber frame, the lower surface of the shading rubber belt and the upper surface of the reflecting sheet can absorb blue light, and although the blue light has a certain effect, the blue light still leaks a little, and the edge brightness cannot be ensured. Therefore, how to prevent blue light leakage from the edge of the backlight while ensuring the brightness of the edge presents a better display screen, which is an urgent problem to be solved at present.

Disclosure of Invention

In view of the foregoing, an object of the present utility model is to provide a backlight module capable of solving the problem of abnormal display of the edge of the backlight module and ensuring the brightness of the edge of the display area.

Another object of the present utility model is to provide a display device including the above-mentioned backlight module.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

according to an aspect of the present utility model, there is provided a backlight module including:

a back plate comprising a receiving cavity,

a backlight positioned within the receiving cavity, the backlight configured to provide light;

the light guide plate is positioned in the accommodating cavity and comprises a light incident surface for incident light emitted by the backlight source, a light emergent surface for emergent light and a first reflecting surface opposite to the light emergent surface, and a plurality of second reflecting surfaces connected with the first reflecting surface and the light emergent surface, wherein the light emergent side of the backlight source faces the light incident surface of the light guide plate, and the second reflecting surfaces cover the second anti-leakage layer;

the reflecting sheet is arranged in the accommodating cavity and is positioned at one side of the light guide plate, which is close to the back plate, and the reflecting sheet covers the first reflecting surface;

the fluorescent film is arranged in the accommodating cavity and is positioned on one side, far away from the back plate, of the light guide plate, the fluorescent film covers the light emitting surface, the peripheral edge of the fluorescent film is covered with a first leakage-preventing layer, and the first leakage-preventing layer is configured to absorb light at the edge of the fluorescent film.

In addition, alternatively, the first leakage preventing layer is black ink, and the black ink is coated on the peripheral edge of the fluorescent film.

In addition, the second leakage-proof layer is a composite adhesive tape, and the composite adhesive tape comprises an adhesive layer, a fluorescent layer and a PET substrate layer which are sequentially laminated;

the fluorescent layer is positioned on one side of the bonding layer away from the light guide plate, and the bonding layer is configured to bond and fix the fluorescent layer and the PET substrate layer on the light guide plate.

Further, alternatively, a white reflective layer is included between the fluorescent layer and the PET substrate layer, and the white reflective layer is configured to reflect light back to the light guide plate to realize recycling of the light.

In addition, the second anti-leakage layer may include a body portion attached to a side surface of the light guide plate and a first surrounding portion formed by extending the body portion toward the light emitting surface of the light guide plate.

In addition, the second leakage preventing layer may include a body portion attached to a side surface of the light guide plate and a second surrounding portion formed by extending the body portion toward the first reflecting surface of the light guide plate.

In addition, the second anti-leakage layer may include a body portion attached to a side surface of the light guide plate, a third surrounding portion formed by extending the body portion toward the light emitting surface of the light guide plate, and a fourth surrounding portion formed by extending the body portion toward the first reflecting surface of the light guide plate.

In addition, alternatively, the edge of the light guide plate protrudes from the edge of the fluorescent film, so as to provide a space for the first surrounding portion or the third surrounding portion.

In addition, alternatively, the edge of the light guide plate protrudes from the edge of the reflective sheet, so as to provide a space required for fitting the second surrounding portion or the fourth surrounding portion.

In addition, alternatively, the light guide plate and the reflecting sheet are combined and fixed by a fixing adhesive tape, and one side of the fixing adhesive tape, which is close to the light guide plate, comprises a fluorescent layer.

According to another aspect of the present utility model, a display device is provided, including the above-mentioned backlight module; and a display panel positioned on the light emitting side of the backlight module.

Drawings

The following describes the embodiments of the present utility model in further detail with reference to the drawings.

Fig. 1 is a schematic structural diagram of a conventional backlight module.

Fig. 2 is a schematic diagram illustrating a blue light leakage principle of a conventional backlight module.

Fig. 3 is a schematic structural diagram of a backlight module according to an embodiment of the utility model.

Fig. 4 shows a schematic diagram of preventing blue light leakage of a backlight module according to an embodiment of the present utility model.

Fig. 5 shows a schematic structural view of a fluorescent film covered with a first leak-proof layer according to an embodiment of the present utility model.

Fig. 6 shows a schematic structural diagram of a composite adhesive tape according to an embodiment of the present utility model.

Fig. 7 is a schematic view of a light guide plate covered with a second leakage preventing layer according to an embodiment of the present utility model.

Fig. 8 is a schematic diagram illustrating a positional relationship between a second anti-leakage layer and a light guide plate according to an embodiment of the utility model.

Fig. 9 is a schematic diagram showing a positional relationship between a second anti-leakage layer and a light guide plate according to another embodiment of the utility model.

Fig. 10 is a schematic diagram showing a positional relationship between a second anti-leakage layer and a light guide plate according to another embodiment of the present utility model.

Fig. 11 is a schematic diagram showing a positional relationship between a reflective sheet and a light guide plate according to an embodiment of the present utility model.

Fig. 12 is a schematic structural view of a fixing tape according to an embodiment of the present utility model.

Fig. 13 shows a cross-sectional view of the fluorescent film shown in fig. 5 along the line A-A.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

Along with the continuous development of the liquid crystal display technology, the application field of the liquid crystal display, especially the color liquid crystal display, is also expanding, the backlight module is a provider of the liquid crystal display light source, the liquid crystal display does not emit light, and the appearance of the backlight module light source determines the visual sense of the display. The existing backlight module uses a blue light LED as a light source, and a lower diffusion sheet in the backlight module of a common LCD product is changed into a fluorescent film, so that the color purity and the color saturation of a liquid crystal display can be improved, and the liquid crystal display has the advantages of high color gamut, good image quality, strong stereoscopic impression, strong contrast ratio and the like. However, due to poor edge barrier property of the fluorescent film, after long-time placement or module reliability test, under the conditions of water, heat, light, oxygen and the like, the quantum dots at the edge of the fluorescent film are easy to generate photooxidation, thermal decomposition and other phenomena, so that local failure is caused, a failure edge is formed, blue light leaks from the edge of the fluorescent film, and the edge of a display area is reddish, so that the overall picture quality is very influenced.

Aiming at the problems, the inside of the shading adhesive tape is widened, the lower surface of the shading adhesive tape and the reflecting sheet are coated with gradually changed yellow fluorescent powder, a yellow adhesive frame and the like are generally adopted for improvement at present, but the influence of a failure edge is reduced by absorbing blue light, the brightness of the edge of a module can be influenced, and still a lot of blue light is leaked. Fig. 1 is a schematic diagram of a design scheme of a backlight module commonly used at present, the backlight module comprises a back plate 1, a backlight source (not shown), a light guide plate 3, a reflecting sheet 4, a fluorescent film 5, a rubber frame 6 and a shading adhesive tape 2, fig. 2 is a schematic diagram of a blue light leakage principle of the backlight module commonly used at present, wherein the lower surface of the shading adhesive tape 2 and the upper surface of the reflecting sheet 4 are coated with gradually-changed yellow fluorescent powder, the rubber frame 6 adopts a yellow rubber frame, when blue light is emitted from left and right three sides on the light guide plate 3, the blue light reaches the surface of the rubber frame 6, and after being reflected by the surface of the rubber frame 6, the blue light is upwards spread from a gap between the fluorescent film 5 and the rubber frame 6 to form backlight edge leakage. The blue light can be absorbed by the fluorescent powder on the lower surface of the yellow rubber frame, the shading rubber belt 2 and the upper surface of the reflecting sheet 4, and although the blue light leakage is still not less, and the edge brightness cannot be ensured. Therefore, how to prevent blue light leakage from the edge of the backlight while ensuring the brightness of the edge presents a better display screen, which is an urgent problem to be solved at present.

An embodiment of the present utility model provides a backlight module, as shown in fig. 3-12, which includes a back plate 1, a backlight (not shown), a light guide plate 3, a reflective sheet 4, a fluorescent film 5, and a bezel 6, wherein the backlight (not shown) is configured to provide light. The back plate 1 comprises a containing cavity, the backlight source (not shown in the figure), the light guide plate 3, the reflecting sheet 4, the fluorescent film 5 and the glue frame 6 are located in the containing cavity, and the reflecting sheet 4, the light guide plate 3 and the fluorescent film 5 are sequentially stacked in the containing cavity.

In this embodiment, the light guide plate 3 includes a light incident surface 31 on which the light emitted from the backlight source is incident, a light emergent surface from which the light is emergent, a first reflecting surface opposite to the light emergent surface, and a plurality of second reflecting surfaces connecting the first reflecting surface and the light emergent surface, and the light emergent side of the backlight source faces the light incident surface 31 of the light guide plate 3. The light emitting surface is the upper surface of the light guide plate 3 in fig. 3, namely, the surface close to one side of the fluorescent film 5; the first reflecting surface is opposite to the light emitting surface, namely, the lower surface of the light guide plate 3 in fig. 3, namely, the surface close to one side of the reflecting sheet 4; fig. 7 is a top view of the light guide plate 3, and the second reflecting surfaces are the upper, left and right three side surfaces of the light guide plate in fig. 7. The second reflection surfaces cover the second anti-leakage layer 8, and the second anti-leakage layer 8 is configured to convert light provided by the backlight source into white light and reflect the converted white light back to the light guide plate 3 to realize recycling of the light. It should be noted that, the light provided by the backlight source may be blue light or purple light, and the embodiment of the present utility model is not limited in particular.

The reflecting sheet 4 is positioned on one side of the searching light guide plate 3 close to the back plate 1, and the reflecting sheet 4 covers the first reflecting surface of the light guide plate 3.

The fluorescent film 5 is located at one side of the light guide plate 3 away from the back plate 1, the fluorescent film 5 covers the light emitting surface of the light guide plate 3, the peripheral edge of the fluorescent film 5 is covered with a first leakage preventing layer 7, and the first leakage preventing layer 7 is configured to absorb light leaked at the edge of the fluorescent film 5, so that blue light leakage caused by failure edges of the fluorescent film 5 is effectively prevented.

In one embodiment, the first anti-leakage layer 7 is black ink, and as shown in fig. 5, the black ink is printed on the peripheral edge of the fluorescent film 5. The black edge formed by the black ink can absorb blue light and other colored light leaked at the edge of the fluorescent film 5, and effectively shields blue light leakage caused by failure edges. Because the four sides of the fluorescent film 5 in the backlight module have different failure widths, the width of the black ink covering the edge of the fluorescent film 5 should be set according to the specific width of each failure edge of the fluorescent film 5. Further, the black ink covers the side surface of the fluorescent film 5, and can further absorb colored light such as blue light leaked out from the edge of the fluorescent film 5, thereby more effectively shielding blue light leakage caused by the failure edge.

In one embodiment, as shown in fig. 13, the peripheral edges of the upper surface and the peripheral edges of the lower surface of the fluorescent film 5 are coated with black ink to absorb blue light leaked from the upper and lower surfaces of the failure edge of the fluorescent film 5.

In one embodiment, the second anti-leakage layer 8 is a composite adhesive tape, and as shown in fig. 6, the composite adhesive tape includes an adhesive layer 801, a fluorescent layer 802, and a PET substrate layer 803 that are sequentially stacked. The fluorescent layer 802 is located on a side of the adhesive layer 801 away from the light guide plate 3, and the adhesive layer 801 is configured to adhesively fix the fluorescent layer 802 and the PET substrate layer 803 to the light guide plate 3. The compound adhesive tape 8 covers each second reflecting surface of the light guide plate 3, i.e., the compound adhesive tape 8 is attached to each of the upper, left and right three sides of the light guide plate 3 shown in the drawing. The main components of the fluorescent layer 802 are glue, fluorescent powder and quantum dot powder, which are used to convert blue light from the light guide plate 3 or other light provided by the backlight source into white light.

In this embodiment, a white reflective layer (not shown) is further included between the fluorescent layer 802 and the PET substrate layer 803, and the white reflective layer (not shown) can reflect the white light converted by the fluorescent layer 802 back to the light guide plate 3, so as to realize recycling of the light. The compound adhesive tape 8 is adhered to the second reflecting surface of the light guide plate 3, so that blue light or other light provided by a backlight source can be directly and timely blocked in the light guide plate 3, the distance of the blue light or other light provided by the backlight source is reduced, and the leakage of the blue light is effectively reduced. Meanwhile, blue light from the light guide plate 3 or other light provided by a backlight source is converted into white light through the fluorescent layer 802, and the white light converted by the fluorescent layer 802 is reflected back to the light guide plate 3 by the white reflecting layer, so that the light can be reused. The compound adhesive tape 8 is adhered to the upper, left and right three sides of the light guide plate 3, namely, the second reflecting surface of the light guide plate 3 is adhered with the compound adhesive tape 8. The three sides of the light guide plate 3 are surrounded by the compound adhesive tape 8, so that blue light from the lower side of the light guide plate 3 cannot leak from three sides except the side where the light incident surface of the light guide plate 3 is located, and meanwhile, the blue light can be converted into white light and reflected back to the light guide plate 3, so that the propagation path of the light in the light guide plate 3 is increased, the repeated utilization of the light can be realized, and the brightness of the edge of the backlight module cannot be influenced. The thickness of the composite adhesive tape 8 provided in this embodiment is small, and the adhesive tape is attached to the side edge of the light guide plate 8, so that the internal space of the backlight is not affected.

In a specific embodiment, as shown in fig. 3, the second anti-leakage layer 8 includes a main body 81 attached to a side surface of the light guide plate 3, where the second anti-leakage layer 8 is attached to a second reflecting surface of the light guide plate 3, and the main body surrounds three upper, left and right sides of the light guide plate 3, so that blue light from the lower side of the light guide plate 3 cannot leak from three sides except for a side where the light incident surface of the light guide plate 3 is located, and meanwhile, the blue light can be converted into white light and reflected back to the light guide plate 3, so that a propagation path of the light in the light guide plate 3 is increased, multiple light utilization can be realized, and brightness at an edge of the backlight module cannot be affected.

In this embodiment, the edge of the fluorescent film 5 needs to be ensured to be outside the light guide plate 3, that is, the edge of the fluorescent film 5 protrudes out of the edge of the light guide plate 3, so as to leave enough space for the failure edge, ensure the brightness of the edge, and simultaneously avoid blue light leakage at the edge of the backlight module, so that a better display picture is presented.

In one specific embodiment, as shown in fig. 8, the second leakage preventing layer 8 includes a main portion 81 attached to a side surface of the light guide plate 3, and a first surrounding portion 82 formed by extending the main portion 81 toward the light emitting surface of the light guide plate 3. The second anti-leakage layer 8 is attached to the second reflective surface of the light guide plate 3, the main body 81 surrounds the upper, left and right three sides of the light guide plate 3, and the first surrounding portion 82 covers the edges of three sides of the light emitting surface corresponding to the upper, left and right three sides covered by the main body 81. In this embodiment, the fluorescent film 5 needs to be shrunk by a certain size relative to the light guide plate 3, so that the edge of the light guide plate 3 protrudes beyond the edge of the fluorescent film 5, so as to reserve a certain coverage space for the first surrounding portion 82. The advantage of this scheme is that can fully surround the edge of the play plain noodles of light guide plate and second reflecting surface, do not give blue light leakage's space for blue light from light guide plate 3 downside can't leak from other three sides except that the side that the income plain noodles of light guide plate 3 is located, simultaneously, can turn into white light again blue light, reflect back light guide plate 3, increase the propagation path of light in light guide plate 3, can realize the multiple use of light, can not exert an influence to backlight unit marginal luminance.

In a specific embodiment, as shown in fig. 9, the second leakage preventing layer 8 includes a main portion 81 attached to a side surface of the light guide plate 3, and a second surrounding portion 83 formed by extending the main portion 81 toward the first reflecting surface of the light guide plate 3. The second anti-leakage layer 8 is attached to the second reflective surface of the light guide plate 3, the main body 81 surrounds the upper, left and right three sides of the light guide plate 3, and the second surrounding portion 83 covers the edges of three sides of the first reflective surface corresponding to the upper, left and right three sides covered by the main body 81. In this embodiment, the edge of the fluorescent film 5 needs to be ensured to be outside the light guide plate 3, that is, the edge of the fluorescent film 5 protrudes out of the edge of the light guide plate 3, so as to leave enough space for the failure edge, ensure the brightness of the edge, and simultaneously avoid blue light leakage at the edge of the backlight module, so that a better display picture is presented. Accordingly, the reflective sheet 4 needs to be retracted by a certain size relative to the light guide plate 3, so that the edge of the light guide plate 3 protrudes beyond the edge of the reflective sheet 4, so as to reserve a certain coverage space for the second surrounding portion 83. The advantage of this scheme is that can fully surround the edge of the first reflecting surface of light guide plate and second reflecting surface, do not give the space that blue light leaked for the blue light from light guide plate 3 downside can't leak from other three sides except that the side that the income plain noodles of light guide plate 3 is located, simultaneously, can turn into white light again blue light, reflect back light guide plate 3, increase the propagation path of light in light guide plate 3, can realize the multiple use of light, can not exert an influence to the luminance at backlight unit edge.

In a specific embodiment, as shown in fig. 10, the second leakage preventing layer 8 includes a main body 81 attached to a side surface of the light guide plate 3, a third surrounding portion 84 formed by extending the main body 81 toward the light emitting surface of the light guide plate 3, and a fourth surrounding portion 85 formed by extending the main body 81 toward the first reflecting surface of the light guide plate 3. The second anti-leakage layer 8 is attached to the second reflective surface of the light guide plate 3, the main body 81 surrounds the three upper, left and right sides of the light guide plate 3, the third surrounding portion 84 covers the three edges of the light emitting surface corresponding to the three upper, left and right sides covered by the main body 81, and the fourth surrounding portion 85 covers the three edges of the first reflective surface corresponding to the three upper, left and right sides covered by the main body 81.

In this embodiment, the fluorescent film 5 and the reflective sheet 4 are required to be shrunk by a certain size relative to the light guide plate 3, so that the edge of the light guide plate 3 protrudes beyond the edges of the fluorescent film 5 and the reflective sheet 4, so as to reserve a certain covering space for the third surrounding portion 84 and the fourth surrounding portion 85. The advantage of this scheme is that can all surround the edge of the play plain noodles of light guide plate 3 and the edge of first reflecting surface and second reflecting surface, do not give the space that blue light leaked for the blue light from light guide plate 3 downside can't leak from other three sides except that the side that the income plain noodles of light guide plate 3 is located, simultaneously, can turn into white light again blue light, reflect back light guide plate 3 again, increase the propagation path of light in light guide plate 3, can realize the multiple use of light, can not exert an influence to the luminance at backlight unit edge.

In a specific embodiment, as shown in fig. 11, the light guide plate 3 and the reflecting sheet 4 are combined and fixed by a fixing adhesive tape 9, and a fluorescent powder 90 is disposed on one side of the reflecting sheet 4 near the light guide plate 3, and the fluorescent powder 90 can convert blue light from the light guide plate 3 into white light. It should be noted that, since the fixing tape 9 between the light guide plate 3 and the reflective sheet 4 is only present on the light emitting surface of the light guide plate 3, this embodiment can be used only on the light emitting side of the backlight module. As shown in fig. 12, the fixing tape 9 includes a base material layer 91, a fluorescent layer 92, and an adhesive layer 93, which are sequentially stacked, the fluorescent layer 92 being located on a side of the fixing tape 9 close to the light guide plate 3. The fixing tape 9 is a double sided adhesive structure, and the adhesive layer 93 is located on one side of the fluorescent layer 92 away from the substrate layer 91 and one side of the substrate layer 91 away from the fluorescent layer 92, and is used for adhesively fixing the fluorescent layer 92 and the substrate layer 91 on the light guide plate 3 and fixing the reflective sheet 4 between the back plate 1 and the light guide plate 3. The main components of the fluorescent layer 92 are glue, fluorescent powder and quantum dot powder, which are used for converting blue light from the light guide plate 3 or other light provided by the backlight source into white light.

In one embodiment, the fluorescent film 5 may be a quantum dot film, which is not limited in this embodiment of the present utility model.

Another embodiment of the present utility model provides a display device, the backlight module in the above embodiment is disposed on the display panel 10 on the light emitting side of the backlight module. Specifically, the display device may be any product or component with a display function, such as a liquid crystal display panel, electronic paper, mobile phone, tablet computer, television, display, notebook computer, digital photo frame, navigator, etc.

In this embodiment, the display panel 10, the light guide plate 3 and the reflective sheet 4 are all in a flat sheet shape, and the display panel 10, the light guide plate 3, the reflective sheet 4 and the back plate 1 are sequentially stacked in parallel or substantially parallel. The back plate 1 is preferably made of a strong hard material such as metal or hard plastic for providing support and protection in the overall structure. The reflective sheet is preferably a film or a thin layer made of a high-reflectivity material, and may be, for example, a film made of a high-reflectivity polymer material, or a uniform plating layer formed by plating a high-reflectivity metal material on the back plate 1; at least one surface of the reflecting sheet facing away from the back plate 1 is a reflecting surface with extremely high reflectivity and mirror effect, and light reaching the reflecting surface is fully reflected back into the display panel, thereby helping to provide high-efficiency backlight for the display panel. The light guide plate 3 may be manufactured by combining an optical-grade acrylic plate with a light guide point made of a high-reflectivity material, such as a glass, PMMA or MS light guide plate, but is not limited thereto, and light may travel inside the light guide plate 3 by total internal reflection. When light emitted from the light sources disposed around the light guide plate 3 enters the light guide plate 3 from the side of the light guide plate 3, the light guide plate 3 can change the propagation direction of the light, so that the light is emitted from the light guide plate 3 toward the surface inside the display device, and backlight is provided for the display panel 10. The display panel 10 is provided with a liquid crystal layer and a color filter, wherein the liquid crystal molecules in the liquid crystal layer generate specific light-dark distribution under the action of an applied voltage, and the light transmitted from the fluorescent film 5 passes through the color filter to generate corresponding color light, and the color light is transmitted out through the liquid crystal layer with the specific light-dark distribution, so that a color image can be formed on the outer surface of the display panel.

According to the backlight module and the display device provided by the embodiment of the utility model, the second anti-leakage layer 8 is covered on the second reflecting surface of the light guide plate 3, and the first anti-leakage layer 7 is covered on the peripheral edge of the fluorescent film 5, so that the edge brightness of the backlight module is ensured, the blue light leakage at the edge of the backlight module is avoided, and a better display picture is displayed. The first leakage-proof layer 7 is made of black ink, is uniformly coated on the peripheral edge of the fluorescent film 5, can absorb blue light and other colored light leaked at the edge of the fluorescent film 5, and effectively shields blue light leakage caused by failure edges; the second anti-leakage layer 8 is made of a composite adhesive tape, and blue light or other light provided by a backlight source can be directly blocked in the light guide plate 3 in time by attaching the composite adhesive tape 8 to the second reflecting surface of the light guide plate 3, so that the distance of the blue light or other light provided by the backlight source is reduced, and the leakage of the blue light is effectively reduced. Meanwhile, blue light from the light guide plate 3 or other light provided by a backlight source is converted into white light by the fluorescent layer 802, and the white light converted by the fluorescent layer 802 is reflected back to the light guide plate 3 by the white reflecting layer (not shown), so that the light can be reused. The three sides of the light guide plate 3 are surrounded by the compound adhesive tape 8, so that blue light from the lower side of the light guide plate 3 cannot leak from three sides except the side where the light incident surface of the light guide plate 3 is located, and meanwhile, the blue light can be converted into white light and reflected back to the light guide plate 3, so that the propagation path of the light in the light guide plate 3 is increased, the repeated utilization of the light can be realized, and the brightness of the edge of the backlight module cannot be influenced. The edge brightness of the backlight module is ensured, the blue light leakage generated at the edge of the backlight module is avoided, and the problem of abnormal display of the edge of the backlight module is solved.

It should be understood that the foregoing examples of the present utility model are provided merely for clearly illustrating the present utility model and are not intended to limit the embodiments of the present utility model, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present utility model as defined by the appended claims.

Claims (13)

1. A backlight module, comprising:

a back plate comprising a receiving cavity,

a backlight positioned within the receiving cavity, the backlight configured to provide light;

the light guide plate is positioned in the accommodating cavity and comprises a light incident surface for incident light emitted by the backlight source, a light emergent surface for emergent light and a first reflecting surface opposite to the light emergent surface, and a plurality of second reflecting surfaces connected with the first reflecting surface and the light emergent surface, wherein the light emergent side of the backlight source faces the light incident surface of the light guide plate, and the second reflecting surfaces cover the second anti-leakage layer;

the reflecting sheet is arranged in the accommodating cavity and is positioned at one side of the light guide plate, which is close to the back plate, and the reflecting sheet covers the first reflecting surface;

the fluorescent film is arranged in the accommodating cavity and is positioned on one side, far away from the back plate, of the light guide plate, the fluorescent film covers the light emitting surface, the peripheral edge of the fluorescent film is covered with a first leakage-preventing layer, and the first leakage-preventing layer is configured to absorb light at the edge of the fluorescent film.

2. The backlight module according to claim 1, wherein the first leakage preventing layer is black ink, and the black ink is coated on the peripheral edge of the fluorescent film.

3. The backlight module according to claim 1, wherein the second anti-leakage layer is a composite adhesive tape, and the composite adhesive tape comprises an adhesive layer, a fluorescent layer and a PET substrate layer which are sequentially stacked;

the fluorescent layer is positioned on one side of the bonding layer away from the light guide plate, and the bonding layer is configured to bond and fix the fluorescent layer and the PET substrate layer on the light guide plate.

4. A backlight module according to claim 3, wherein a white reflective layer is included between the phosphor layer and the PET substrate layer, the white reflective layer being configured to reflect light back to the light guide plate to enable recycling of the light.

5. The backlight module according to claim 1, wherein the second anti-leakage layer comprises a body portion attached to a side surface of the light guide plate and a first surrounding portion formed by extending the body portion toward the light emitting surface of the light guide plate.

6. The backlight module according to claim 1, wherein the second leakage preventing layer comprises a body portion attached to a side surface of the light guide plate and a second surrounding portion formed by extending the body portion toward the first reflecting surface of the light guide plate.

7. The backlight module according to claim 1, wherein the second leakage preventing layer comprises a body portion attached to a side surface of the light guide plate, a third surrounding portion formed by extending the body portion toward the light exit surface of the light guide plate, and a fourth surrounding portion formed by extending the body portion toward the first reflecting surface of the light guide plate.

8. The backlight module according to claim 5, wherein an edge of the light guide plate protrudes beyond an edge of the fluorescent film to provide a space for the first surrounding portion to fit.

9. The backlight module according to claim 6, wherein the edge of the light guide plate protrudes from the edge of the reflective sheet, so as to provide a space for the second surrounding portion to fit.

10. The backlight module according to claim 7, wherein an edge of the light guide plate protrudes beyond an edge of the fluorescent film to provide a space for the third surrounding portion to fit.

11. The backlight module according to claim 7, wherein an edge of the light guide plate protrudes from an edge of the reflective sheet to provide a space for the fourth surrounding portion to fit.

12. A backlight module according to claim 1, wherein the light guide plate and the reflecting sheet are combined and fixed by a fixing tape, and a side of the fixing tape close to the light guide plate comprises a fluorescent layer.

13. A display device comprising a backlight module according to any one of claims 1-12 and a display panel on the light exit side of the backlight module.