CN114265141B - Light guide plate, backlight module and display device - Google Patents
Light guide plate, backlight module and display device Download PDFInfo
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- CN114265141B CN114265141B CN202111589783.8A CN202111589783A CN114265141B CN 114265141 B CN114265141 B CN 114265141B CN 202111589783 A CN202111589783 A CN 202111589783A CN 114265141 B CN114265141 B CN 114265141B
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Abstract
The application provides a light guide plate, a backlight module and a display device, wherein the light guide plate comprises a transparent light guide layer; the transparent shell is arranged on one side of the transparent light guide layer, the orthographic projection area of the transparent shell on the transparent light guide layer is overlapped with the area of the transparent light guide layer, and a cavity is arranged in the transparent shell; and the quantum dot material is filled in the cavity. According to the light guide plate, the transparent shell is arranged on one side of the transparent light guide layer, the cavity is arranged in the transparent shell, the quantum dot material is filled in the cavity, and the transparent shell protects the quantum dot material, so that the influence of the external environment on the quantum dot is reduced, the failure of the quantum dot is avoided, and the service life of the light guide plate is prolonged.
Description
Technical Field
The present application relates to the field of display devices, and in particular, to a light guide plate, a backlight module, and a display device.
Background
The backlight module can be used for providing a surface light source for the display panel. The backlight module generally comprises a light source and a light guide plate, wherein light rays emitted from the light source enter the light inlet surface of the light guide plate and enter the light guide plate, and are emitted from the light outlet surface of the light guide plate after being diffused by the light guide plate, so that a surface light source is provided for the liquid crystal display panel.
The light guide plate is also provided with a quantum dot film, and blue light is utilized to excite the quantum dot film to generate mixed white light, so that the color gamut of the display panel is wider. Oxygen and moisture molecules may cause photooxidation and photo-corrosion on the surface of the quantum dots when the quantum dots are exposed to air and moisture (e.g., water). Once the quantum dots react with oxygen and moisture, new defects may be created on the surface of the quantum dots. Such defects may result in reduced luminescence of the quantum dots.
The quantum dot film generally includes two base films and a quantum dot layer between the two base films. Because the influence of water vapor and oxygen on the quantum dots is large, the quantum dot film is generally cut by laser instead of a cutting die. The edge area of the quantum dot film can be sintered by laser cutting, so that water vapor and oxygen are prevented from entering, but the quantum dots positioned in the edge area can be disabled, and the edge of the display area of the backlight module is enabled to be blue. The blue edge not only affects the display effect of the liquid crystal display device, but also causes eye fatigue, resulting in reduced vision.
Disclosure of Invention
The application provides a light guide plate, a backlight module and a display device, which are used for solving the problem that quantum dots of the light guide plate are easy to fail.
In one aspect, the present application provides a light guide plate comprising:
a transparent light guide layer;
the transparent shell is arranged on one side of the transparent light guide layer, the orthographic projection area of the transparent shell on the transparent light guide layer is overlapped with the area of the transparent light guide layer, and a cavity is arranged in the transparent shell;
and the quantum dot material is filled in the cavity.
In one possible implementation manner of the present application, an injection hole is formed on at least one side surface of the transparent shell, and the quantum dot material is injected into the cavity through the injection hole;
the transparent case further includes a sealing member adapted to the injection hole.
In one possible implementation manner of the present application, the cavity includes a plurality of subchambers, and two adjacent subchambers are spaced apart in the transparent shell.
In one possible implementation manner of the application, a plurality of partition boards are arranged in the cavity, the partition boards divide the cavity into a plurality of subchambers, through holes are arranged on the partition boards, and two adjacent subchambers are mutually communicated through the through holes.
In one possible implementation manner of the present application, the orthographic projection area of the transparent shell on the transparent light guiding layer is overlapped with the area of the light guiding layer, and the transparent shell and the transparent light guiding layer are adhered to each other or integrally formed.
In one possible implementation of the present application, the thickness of the transparent light guiding layer is less than or equal to 0.4mm, and the thickness of the transparent housing is less than or equal to 0.22mm.
In one possible implementation manner of the present application, the transparent light guiding layer includes a light emitting surface and a reflecting surface, the transparent shell is disposed on the light emitting surface, and the reflecting surface is provided with a plurality of light guiding dots
In one possible implementation manner of the present application, the transparent light guiding layer is a flat plate structure or a wedge structure.
On the other hand, the application also provides a backlight module, which comprises the light guide plate.
On the other hand, the application also provides a display device which comprises a display panel and a backlight module, wherein the backlight module is the backlight module.
According to the light guide plate, the backlight module and the display device provided by the application, the transparent shell is arranged on one side of the transparent light guide layer, the cavity is arranged in the transparent shell, the quantum dot material is filled in the cavity, and the transparent shell is used for protecting the quantum dot material, so that the influence of the external environment on the quantum dot is reduced, the failure of the quantum dot is avoided, and the service life of the light guide plate is prolonged.
Drawings
The technical solution and other advantageous effects of the present application will be made apparent by the following detailed description of the specific embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the application.
Fig. 2 is a schematic cross-sectional structure of a light guide plate according to an embodiment of the application.
Fig. 3 is a schematic structural diagram of a touch substrate according to an embodiment of the present application.
Fig. 4 is a schematic perspective view of a light guide plate according to an embodiment of the present application.
Fig. 5 is a schematic cross-sectional view of an injection hole and a sealing member of a light guide plate according to an embodiment of the present application.
Fig. 6 is a schematic cross-sectional structure of an injection hole and a sealing member of a light guide plate according to still another embodiment.
Fig. 7 is a schematic perspective view of a transparent light guiding layer of a light guiding plate according to another embodiment.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.
In the description of the present application, it is to be understood that the terms "first", "second" and "third" may include one or more of the stated features, either explicitly or implicitly. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. It should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" should be interpreted broadly, for example, as being directly connected, or indirectly connected through intermediaries, as being internal to two elements or as being in interaction with each other. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
The following disclosure provides many different embodiments, or examples, for implementing different features of the application. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.
The embodiment of the application provides a light guide plate, a backlight module and a display device, which are respectively described in detail below.
In the present application, as shown in fig. 1, an embodiment of the present application provides a backlight module including the light guide plate. Specifically, the backlight module of the embodiment of the application sequentially includes, from bottom to top, a back plate 200, an excitation light source 300 located on a side edge of the back plate 200, a reflective sheet 400, a light guide plate 100, an optical film 500, a plastic frame 600, and a liquid crystal panel 700 disposed on the plastic frame 600. The excitation light source 300 may be an ultraviolet light source with a wavelength range of 280nm to 400nm or a blue light source with a center wavelength of 430nm to 480nm and a half-peak width of 15nm to 55 nm; including but not limited to mercury lamps, LEDs, laser diodes, OLEDs, and the like.
Referring to fig. 2-7, an embodiment of the present application firstly provides a light guide plate 100, which includes a transparent light guide layer 10, a transparent shell 20 and a quantum dot material 30.
The transparent light guide layer 10 is used for changing the point light source of the excitation light source 300 into a surface light source. The transparent light guiding layer 10 has a plate-shaped structure, and the transparent light guiding layer 10 may be one or more of Polyethylene (PE), polypropylene (PP), polyethylene naphthalate (PEN), polycarbonate (PC), polymethyl acrylate (PMA) and polymethyl methacrylate (PMMA).
The transparent casing 20 is disposed on one side of the transparent light guiding layer 10, the orthographic projection area of the transparent casing 20 on the transparent light guiding layer 10 is overlapped with the area of the transparent light guiding layer 10, and a cavity 201 is disposed inside the transparent casing 20. The transparent case 20 may be one or more of Polyethylene (PE), polypropylene (PP), polyethylene naphthalate (PEN), polycarbonate (PC), polymethyl acrylate (PMA) and polymethyl methacrylate (PMMA). Illustratively, the transparent housing 20 and the transparent light guide layer 10 may both be made of PMMA or PC. When the transparent shell 20 and the transparent light guide layer 10 are made of different materials, the transparent shell 20 may be made of PMMA, and the transparent light guide layer 10 is made of PC. The transparent light guide layer 10 and the transparent housing 20 may be made of the same material or different materials, which is not particularly limited herein.
The quantum dot material 30 fills the cavity 201. By filling the quantum dot material 30 in the cavity 201, the excitation light source 300 is utilized to enter the transparent shell 20 through the transparent light guide layer 10 again, and the quantum dot material is excited to generate mixed white light, so that the quantum dot material 30 can emit light normally and simultaneously can be protected by the transparent shell 20, the influence of external environmental factors on the quantum dot is avoided, and the problem of failure of the quantum dot material 30 can be avoided. In addition, compared with doping the quantum dots in the light guide plate 100, due to the influence of the substances of the light guide plate 100, the problem that the quantum dot materials 30 doped in the light guide plate 100 may be unevenly distributed may be caused, so that the phenomenon of uneven brightness may be caused, and the quantum dot materials 30 are filled in the cavity 201 of the transparent shell 20, so that the distribution of the quantum dot materials 30 is more uniform, the uniformity of light output by the light guide plate 100 is ensured, and the overall display effect is improved.
According to the light guide plate 100 disclosed by the embodiment of the application, the transparent shell 20 is arranged on one side of the transparent light guide layer 10, the cavity 201 is arranged in the transparent shell 20, the quantum dot material 30 is filled in the cavity 201, and the transparent shell 20 plays a role in protecting the quantum dot material 30, so that the influence of the external environment on the quantum dot material 30 is reduced, the failure of the quantum dot is avoided, and the service life of the light guide plate 100 is prolonged.
In some embodiments, as shown in conjunction with fig. 3 and 4, the transparent case 20 is further provided with an injection hole 202 and a sealing member 40.
At least one side surface of the transparent shell 20 is provided with an injection hole 202, and the quantum dot material 30 is injected into the cavity 201 through the injection hole 202, so that the quantum dot material 30 is filled in the cavity 201, thereby being beneficial to ensuring the uniformity of light emitted by the light guide plate 100 and improving the overall display effect. The injection hole 202 may be a circular hole, a square hole, a polygonal hole, or the like, and the shape of the injection hole 202 is not particularly limited herein. The number of the injection holes 202 may be plural, and one injection hole 202 may be provided on the side surface of each transparent case 20, or plural injection holes 202 may be provided on the side surface of each transparent case, and the arrangement of the plural injection holes 202 may improve the injection efficiency of the quantum dot material 30.
The transparent case 20 further includes a sealing member 40, and the sealing member 40 is fitted with the injection hole 202. The sealing piece 40 and the injection hole 202 are matched to seal the quantum dot material 30 in the transparent shell 20, so that the quantum dot can be avoided, the sealing piece 40 can be a rubber plug or a rubber sealing layer, the rubber plug or the rubber sealing layer is used for sealing the injection hole 202 by taking the sealing piece 40 as a rubber sealing layer after the quantum dot is injected into the cavity 201, when the number of the injection holes 202 is multiple, the rubber sealing layer can be only arranged at the injection hole 202, and the whole surface of the rubber sealing layer can be coated on the side surface provided with the injection holes 202, so that the process is simplified.
Further, as shown in fig. 5, the injection hole 202 may be a counter-sunk hole, and correspondingly, the sealing member 40 may be a sealing member 40 with a T-shaped cross section, for example, a rubber plug with a T-shaped cross section, and by setting the injection hole 202 as a counter-sunk hole, a surface of the sealing member 40 facing away from the cavity 201 is flush with a side surface of the transparent housing 20, so that the light guide plate 100 is beneficial to realizing compact structure of the backlight module while ensuring the aesthetic degree of the light guide plate 100.
It should be noted that, the light guide plate 100 has a light incident surface 13, the light incident surface 13 is one surface of the light guide plate 100, the light incident surface 13 is disposed towards the excitation light source 300 of the backlight module, the light generated by the excitation light source 300 enters the light guide plate 100 from the light incident surface 13, the light incident surface 13 is not provided with the injection hole 202 and the sealing member 40, that is, the injection hole 202 and the sealing member 40 are only disposed on the side surface of the transparent shell 20 away from the light incident surface 13, since the light incident surface 13 is closest to the excitation light source 300, the illumination intensity of the excitation light source 300 is the greatest, and the transparent shell 20 is made of transparent material, therefore if the surface is provided with the injection hole 202 and the sealing member 40, due to different refractive indexes, the light is easy to make the light uneven when entering the transparent light guide layer 10 through the transparent shell 20 provided with the injection hole 202, thereby finally causing the light-emitting uneven of the light guide plate 100, and when only the injection hole 202 and the sealing piece 40 are arranged on the other side surface of the transparent shell 20 away from the light-entering surface 13, the light intensity can be reduced to a certain extent due to the diffuse reflection and other actions when the light enters the light guide plate 100, so that the better light-emitting uniformity can be maintained even if the light passes through the transparent shell 20 provided with the injection hole 202 when the light is emitted, therefore, when only the injection hole 202 and the sealing piece 40 are arranged on the other side surface of the transparent shell 20 away from the light-entering surface 13, the light-emitting uniformity of the light guide plate 100 is guaranteed, and the whole display effect is improved.
In some embodiments, as shown in fig. 6, the cavity 201 includes a plurality of subcavities 211, with two adjacent subcavities 211 being spaced apart within the transparent housing 20. The shape of the cavity 201 may be polygonal, for example, triangular, rectangular, or regular hexagonal, and the shape of the cavity 201 is not limited herein. Further, the shapes of the plurality of subchambers 211 may be the same or different, for example, partially rectangular, partially triangular, etc. Furthermore, the number of subchambers 211 may be two, three, four or even more, without limiting the number of chambers 201 herein. Taking each sub-cavity 211 as an example, the plurality of sub-cavities 211 may be distributed in a matrix, for example, in a "2×2" matrix or in a "3×3" matrix. Compared with the structure of a single cavity 201, the cavity 201 is arranged into a plurality of subchambers 211, so that the quantum dot materials 30 can be more uniformly distributed in each cavity 201, and the light-emitting of the light guide plate 100 can be more uniform.
In some embodiments, a plurality of separators 50 are disposed in the cavity 201, the separators 50 divide the cavity 201 into a plurality of sub-cavities 211, through holes (not shown) are disposed on the separators 50, and two adjacent sub-cavities 211 are communicated with each other through the through holes. When the plurality of sub-cavities 211 are in a rectangular structure distributed in a 3×3 matrix, at least one of the four partition boards 50 for enclosing to form the 5 th sub-cavity 211 is provided with a through hole, so that the quantum dot material 30 can enter the 5 th sub-cavity 211 from the injection hole 202 through other adjacent sub-cavities 211, thereby ensuring that the quantum dot material 30 can be uniformly filled in each cavity 201, and ensuring that the light guide plate 100 can uniformly emit light.
In some embodiments, the orthographic projection area of the transparent shell 20 on the transparent light guiding layer 10 coincides with the area of the light guiding layer 10, and the orthographic projection area of the transparent shell 20 on the transparent light guiding layer 10 coincides with the area of the transparent light guiding layer 10, so that the light emitted from the transparent light guiding layer 10 can pass through the quantum dot material 30 to enable the light guiding plate 100 to realize the whole surface light emission.
The transparent shell 20 and the transparent light guide layer 10 are adhered to each other or integrally formed. For example, when the transparent casing 20 and the transparent light guiding layer 10 are bonded, the transparent casing 20 and the transparent light guiding layer 10 may be connected by using an optical adhesive, and the optical adhesive may be coated on the transparent casing 20 or the transparent light guiding layer 10, or may be coated on the edge of the transparent casing 20 or the transparent light guiding layer 10, so that the structure is simple. When the connection mode of transparent casing 20 and transparent light guide layer 10 is integrated into one piece, transparent casing 20 and transparent light guide layer 10 can adopt injection moulding to can guarantee the structural stability between transparent casing 20 and the transparent light guide layer 10, also be favorable to guaranteeing the homogeneity of light-emitting of light guide plate 100 simultaneously, be favorable to improving holistic display effect.
In some embodiments, the transparent light guide layer 10 has a thickness of less than or equal to 0.4mm and the transparent housing 20 has a thickness of less than or equal to 0.22mm. The thickness of the transparent light guide layer 10 and the thickness of the transparent shell 20 are controlled within a smaller range, so that the thickness of the backlight module is reduced when the light guide plate 100 is assembled to form the backlight module, and the realization of light weight and thinning is facilitated.
In some embodiments, the transparent light guiding layer 10 includes a light emitting surface 11 and a reflective surface 12 opposite to each other, the transparent housing 20 is disposed on the light emitting surface 11, and the reflective surface 12 is provided with a plurality of light guiding dots 60. The light guide plate 100 achieves the adjustment of light by breaking total reflection using the light guide dots 60. The light-guiding dots 60 can scatter light, so that the light-scattering capability of the light-guiding plate 100 to light can be effectively improved, namely, the light utilization rate is improved, and the surface light source formed by emergent light-guiding plate 100 is more uniform and has higher brightness. Since the light guide dots 60 are positioned inside the transparent light guide layer 10, the light guide dots 60 of the light guide plate 100 and the reflective sheet 400 of the backlight module do not rub against each other, thereby prolonging the service life of the backlight module. Light directing dots 60 can be produced by either printed or non-printed chemical etching, laser direct writing, or photolithography. Wherein, the light guide dots 60 may be of a convex structure or a concave structure. The light guide dots 60 are uniformly or non-uniformly distributed, and may be in various shapes such as rectangular, circular, V-shaped, hexagonal, pyramidal, etc., and the light guide dots 60 may be concentrically arranged or arranged in an array, etc., which is not particularly limited herein.
In some embodiments, as shown in fig. 7, the transparent light guiding layer 10 is a flat plate structure or a wedge structure. Taking the light guide plate 100 as an example, the thickest end of the wedge structure is close to the excitation light source 300, and is used for receiving the light emitted by the excitation light source 300 and guiding the light into the transparent light guide layer 10; the light-emitting surface 11 and the light-entering surface 13 are vertically opposite, the light-entering surface 13 is an inclined surface, a part of light entering the transparent light-guiding layer 10 is directly led out through the light-emitting surface 11, and the other part of light is finally emitted from the light-emitting surface 11 after being reflected by the reflecting surface 12.
Note that, the reason is that. Since the backlight module has the light guide plate, the backlight module has the same advantages as the light guide plate, and the embodiment is not described herein.
In order to better implement the backlight module, the application also provides a display device which comprises a display panel and the backlight module, wherein the backlight module is the backlight module. The display panel may be a liquid crystal display panel or a quantum dot LED (QLED) display panel, and the display device may be a liquid crystal display device or a quantum dot LED (QLED) display device, respectively. Since the display device has the display panel, the display device has the same beneficial effects, and the embodiment is not repeated here. The application of the embodiment of the application to the display device is not particularly limited, and the display device can be any product or component with a display function, such as a television, a notebook computer, a tablet personal computer, wearable display equipment (such as a smart bracelet, a smart watch and the like), a mobile phone, virtual reality equipment, augmented reality equipment, vehicle-mounted display, an advertising lamp box and the like.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments. In the implementation, each unit or structure may be implemented as an independent entity, or may be implemented as the same entity or several entities in any combination, and the implementation of each unit or structure may be referred to the foregoing method embodiments and will not be repeated herein.
The light guide plate 100, the backlight module and the display device provided by the embodiments of the present application are described in detail, and specific examples are applied to illustrate the principles and implementation of the embodiments of the present application, and the description of the above embodiments is only used to help understand the technical solution and the core idea of the embodiments of the present application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (10)
1. A light guide plate, comprising:
a transparent light guide layer;
the transparent shell is arranged on one side of the transparent light guide layer, the transparent shell and the transparent light guide layer are made of different materials, the transparent shell and the transparent light guide layer are adhered to each other, and a cavity is formed in the transparent shell; an injection hole is formed in the transparent shell, and quantum dot materials are injected into the cavity through the injection hole;
the quantum dot material is filled in the cavity;
the light guide plate is a side-in light guide plate, the light guide plate is provided with a light incident surface, and the injection hole is arranged on the side surface of the transparent shell, which is far away from the light incident surface.
2. The light guide plate of claim 1, wherein the transparent housing further comprises a seal that is compatible with the injection hole.
3. The light guide plate of claim 1, wherein the cavity comprises a plurality of subchambers, and two adjacent subchambers are spaced apart within the transparent housing.
4. A light guide plate as claimed in claim 3, wherein a plurality of partition plates are provided in the cavity, the partition plates divide the cavity into a plurality of sub-cavities, through holes are provided in the partition plates, and two adjacent sub-cavities are mutually communicated through the through holes.
5. The light guide plate according to claim 1, wherein the orthographic projection area of the transparent shell on the transparent light guide layer is coincident with the area of the light guide layer, and the transparent shell and the transparent light guide layer are adhered to each other or integrally formed.
6. The light guide plate of claim 1, wherein the transparent light guide layer has a thickness of less than or equal to 0.4mm and the transparent housing has a thickness of less than or equal to 0.22mm.
7. The light guide plate of any one of claims 1-6, wherein the transparent light guide layer comprises a light exit surface and a reflective surface opposite to each other, the transparent housing is disposed on the light exit surface, and the reflective surface is provided with a plurality of light guide dots.
8. The light guide plate according to any one of claims 1 to 6, wherein the transparent light guide layer is a flat plate structure or a wedge structure.
9. A backlight module comprising the light guide plate according to any one of claims 1 to 8.
10. A display device comprising a display panel and a backlight module, wherein the backlight module is the backlight module according to claim 9.
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| CN202111589783.8A CN114265141B (en) | 2021-12-23 | 2021-12-23 | Light guide plate, backlight module and display device |
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| CN202111589783.8A CN114265141B (en) | 2021-12-23 | 2021-12-23 | Light guide plate, backlight module and display device |
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| CN115343885A (en) * | 2022-08-29 | 2022-11-15 | 深圳创维－Rgb电子有限公司 | Side-in backlight module and display device |
| CN115728990A (en) * | 2022-11-23 | 2023-03-03 | 广东瑞捷光电股份有限公司 | Quantum dot diffusion plate and quantum dot backlight source |
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