Backlight structure, backlight module and display device

Abstract

The utility model provides a backlight structure, a backlight module and a display device.The backlight structure comprises a quantum dot light-emitting unit, a light guide plate and a quantum dot layer, the quantum dot light-emitting unit is used for emitting first light, and the light guide plate comprises a light-emitting face, a back face and a plurality of side faces surrounding the light-emitting face, the quantum dot light-emitting unit is arranged in the light guide plate and close to the side face or arranged on the back face, the light guide plate is used for uniformizing first light rays emitted by the quantum dot light-emitting unit and emitting the first light rays in the direction perpendicular to the light-emitting face, and the quantum dot layer is at least partially arranged on the light-emitting face and used for receiving the first light rays and converting the first light rays into second light rays to be emitted. The quantum dot light-emitting unit is directly connected with the light guide plate, so that the first light emitted by the quantum dot light-emitting unit can completely enter the light guide plate, the phenomena of light leakage and the like caused by the fact that the first light emitted by the quantum dot light-emitting unit leaks out of other areas of the display device can be avoided, and the probability of picture color difference on the side of the display device can be reduced.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a backlight structure, a backlight module, and a display device. Background Technology

[0002] In related technologies, for display devices that combine quantum dot photoluminescence, light leakage may occur on the sides, resulting in color distortion of the image and causing technical problems such as image failure on the sides of the display device. Utility Model Content

[0003] The purpose of this application is to provide a backlight structure, a backlight module, and a display device to solve the technical problem that the side screen of a display device incorporating quantum dot light emission is prone to failure.

[0004] In a first aspect, this application provides a backlight structure, including:

[0005] Quantum dot light-emitting units are used to emit the first light rays;

[0006] A light guide plate includes a light-emitting surface and a back surface disposed opposite to each other, and a plurality of side surfaces surrounding the light-emitting surface. The quantum dot light-emitting unit is disposed within the light guide plate and close to the side surface, or the quantum dot light-emitting unit is disposed on the back surface. The light guide plate is used to homogenize the first light emitted by the quantum dot light-emitting unit and emit it along a direction perpendicular to the light-emitting surface.

[0007] A quantum dot layer, at least partially disposed on the light-emitting surface, is used to receive the first light ray and convert it into a second light ray for emission.

[0008] In the backlight structure provided in this application, a quantum dot light-emitting unit is used to emit a first light beam. The light guide plate includes a light-emitting surface and a back surface arranged opposite to each other, and multiple side surfaces surrounding the light-emitting surface. The quantum dot light-emitting unit is disposed within the light guide plate and close to the side surface, or disposed on the back surface. The light guide plate is used to homogenize the first light beam emitted by the quantum dot light-emitting unit and emit it along a direction perpendicular to the light-emitting surface. The quantum dot layer is at least partially disposed on the light-emitting surface and is used to receive the first light beam and convert it into a second light beam for emission. The quantum dot light-emitting unit is directly connected to the light guide plate so that all the first light beam emitted by the quantum dot light-emitting unit can enter the light guide plate, preventing the first light beam emitted by the quantum dot light-emitting unit from leaking out from other areas of the display device, avoiding light leakage in the display device, and thus reducing the probability of color distortion on the edges of the display device.

[0009] The quantum dot layer is at least partially disposed on the side of the light guide plate to block light from escaping from the side of the light guide plate.

[0010] At least a portion of the quantum dot layer is disposed on the back side of the light guide plate.

[0011] The light-emitting surface near the side has a first groove for accommodating the quantum dot light-emitting unit; or, the side has a second groove for accommodating the quantum dot light-emitting unit.

[0012] The quantum dot light-emitting unit includes a cathode, an electron injection layer, an electron transport layer, a light-emitting layer, a hole transport layer, a hole injection layer, and an anode arranged sequentially. The material of the light-emitting layer includes cadmium-based materials and / or perovskite quantum dot materials. The cathode, electron injection layer, electron transport layer, light-emitting layer, hole transport layer, hole injection layer, and anode are arranged along the horizontal direction of the light guide plate.

[0013] The light-emitting layer includes red quantum dots, green quantum dots, and blue quantum dots. A blocking layer is provided between the red quantum dots and the green quantum dots, and a blocking layer is provided between the green quantum dots and the blue quantum dots.

[0014] The quantum dot layer comprises a first protective layer, a quantum dot material layer, and a second protective layer stacked sequentially. The materials of the first and second protective layers include polyacrylate, epoxy resin, or silicone. The materials of the quantum dot material layer include cadmium-based materials and / or perovskite quantum dot materials.

[0015] Secondly, this application provides a backlight module, the backlight module including a back panel, a middle frame and the backlight structure, the backlight structure being disposed on the back panel, the middle frame surrounding the outer periphery of the back panel, and the middle frame being used to house a display panel.

[0016] In the backlight module provided in this application, a quantum dot light-emitting unit is used to emit a first light. The quantum dot light-emitting unit is disposed within a light guide plate and near the side, or disposed on the back side. The light guide plate is used to homogenize the first light emitted by the quantum dot light-emitting unit and emit it along a direction perpendicular to the light-emitting surface. The quantum dot layer is at least partially disposed on the light-emitting surface and is used to receive the first light and convert it into a second light for emission. The quantum dot light-emitting unit is directly connected to the light guide plate so that all the first light emitted by the quantum dot light-emitting unit can enter the light guide plate. This can prevent the first light emitted by the quantum dot light-emitting unit from leaking out from the gap between the middle frame and the light guide plate, avoid light leakage in the display device, and thus reduce the probability of color distortion on the sides of the display device.

[0017] Thirdly, this application provides a display device, which includes a display panel and the backlight module, wherein the display panel is disposed on the middle frame.

[0018] In the display device provided in this application, a quantum dot light-emitting unit is used to emit a first light. The quantum dot light-emitting unit is disposed within a light guide plate and near the side, or disposed on the back side. The light guide plate is used to homogenize the first light emitted by the quantum dot light-emitting unit and emit it along a direction perpendicular to the light-emitting surface. The quantum dot layer is at least partially disposed on the light-emitting surface and is used to receive the first light and convert it into a second light for emission. The quantum dot light-emitting unit is directly connected to the light guide plate so that all the first light emitted by the quantum dot light-emitting unit can enter the light guide plate, which can prevent the first light emitted by the quantum dot light-emitting unit from leaking out from other areas of the display device, avoid light leakage in the display device, and thus reduce the probability of color distortion on the edges of the display device.

[0019] The display panel includes a privacy film and a dispersed liquid crystal layer. The privacy film and the dispersed liquid crystal layer work together to enable the display device to achieve both a privacy viewing angle and a sharing viewing angle. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic cross-sectional view of a backlight structure provided in Embodiment 1 of this application. Figure 1 ;

[0022] Figure 2 This is a cross-sectional structural diagram of a backlight structure provided in Embodiment 2 of this application;

[0023] Figure 3 This is a cross-sectional structural diagram of a backlight structure provided in Embodiment 3 of this application;

[0024] Figure 4 This is a top view schematic diagram of a backlight structure provided in Embodiment 1 of this application;

[0025] Figure 5 This is a schematic diagram of a backlight structure including a first groove, provided in Embodiment 1 of this application;

[0026] Figure 6 This is a schematic cross-sectional view of a backlight structure provided in Embodiment 1 of this application. Figure 2 ;

[0027] Figure 7 This is a cross-sectional structural diagram of a backlight structure provided in Embodiment 4 of this application;

[0028] Figure 8 This is a schematic diagram of the back structure of a light guide plate provided in Embodiment 1 of this application;

[0029] Figure 9 This is a schematic diagram of the structure of a display device provided in Embodiment 5 of this application.

[0030] Label Explanation:

[0031] Display device-1, backlight module-1000, backlight structure-100, display panel-200, quantum dot light-emitting unit-10, cathode-11, electron injection layer-12, electron transport layer-13, light-emitting layer-14, red quantum dot-141, green quantum dot-142, blue quantum dot-143, hole transport layer-15, hole injection layer-16, anode-17, light guide plate-20, first groove-21, through hole-23, edge notch-24, quantum dot layer-30, first protective layer-31, quantum dot material layer-32, second protective layer-33, back plate-40, middle frame-41, optical film layer-42, privacy film-43, dispersed liquid crystal layer-44, light-shielding tape-45, edge shielding tape-56. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0033] In this document, references to "embodiment" or "implementation" mean that a particular feature, structure, or characteristic described in connection with an embodiment or implementation may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0034] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0035] In this specification, for convenience, terms such as "middle," "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are used to indicate orientation or positional relationships in conjunction with the accompanying drawings. This is solely for the purpose of facilitating the description and simplification, and does not imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this disclosure. The positional relationships of the constituent elements may be appropriately varied depending on the orientation of the constituent elements being described. Therefore, the use of terms not limited to those described in the specification may be appropriately replaced as needed.

[0036] In this specification, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they may refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection via an intermediate component, or a connection within two components. Those skilled in the art will understand the meaning of these terms in this disclosure as appropriate.

[0037] In related technologies, for display devices that combine quantum dot photoluminescence, light leakage may occur on the sides, resulting in color distortion of the image and causing technical problems such as image failure on the sides of the display device.

[0038] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic cross-sectional view of a backlight structure provided in Embodiment 1 of this application. Figure 1 , Figure 2 This is a cross-sectional schematic diagram of a backlight structure provided in Embodiment 2 of this application. The purpose of this application is to provide a backlight structure 100 to solve the technical problem that the side images of display devices incorporating quantum dot light emission are prone to failure.

[0039] The backlight structure 100 includes a quantum dot light-emitting unit 10, a light guide plate 20, and a quantum dot layer 30. The quantum dot light-emitting unit 10 is used to emit a first light.

[0040] In this embodiment, the first light is visible light, and includes, but is not limited to, blue light or white light, and the quantum dot light-emitting unit 10 includes, but is not limited to, a blue quantum dot excitation unit.

[0041] The light guide plate 20 includes a light-emitting surface and a back surface arranged opposite to each other, and multiple side surfaces surrounding the light-emitting surface. The quantum dot light-emitting unit 10 is disposed within the light guide plate 20 and close to the side surface, or the quantum dot light-emitting unit 10 is disposed on the back surface. The number of quantum dot light-emitting units 10 is multiple, and these multiple quantum dot light-emitting units 10 are arranged sequentially within the light guide plate 20 or arranged in an array on the back surface. This application does not limit this arrangement and will describe it in detail below. The light guide plate 20 is used to homogenize the first light emitted by the quantum dot light-emitting unit 10 and emit it along a direction perpendicular to the light-emitting surface.

[0042] like Figure 1 As shown, the quantum dot light-emitting unit 10 is directly disposed within the light guide plate 20 and close to the side, and the quantum dot light-emitting unit 10 and the light guide plate 20 do not need to be spaced apart, so that the first light emitted by the quantum dot light-emitting unit 10 can all enter the light guide plate 20. This is beneficial to improving the light utilization rate of the first light emitted by the quantum dot light-emitting unit 10 in the display device 1, and can prevent the first light emitted by the quantum dot light-emitting unit 10 from leaking out from other areas of the display device 1, avoiding light leakage in the display device 1, and thus reducing the probability of color distortion on the sides of the display device 1. Figure 2 As shown, the quantum dot light-emitting unit 10 is directly disposed on the back side of the light guide plate 20, and the quantum dot light-emitting unit 10 emits light towards the light guide plate 20. This also allows the first light emitted by the quantum dot light-emitting unit 10 to enter the light guide plate 20 completely, avoiding light leakage and other phenomena caused by the first light emitted by the quantum dot light-emitting unit 10 leaking out from other areas of the display device 1.

[0043] The quantum dot layer 30 is at least partially disposed on the light-emitting surface. The quantum dot layer 30 receives the first light and converts it into a second light for emission. Specifically, the first light excites the quantum dot layer 30, causing it to emit the second light. The second light illuminates the display panel and forms the final displayed image. It should be noted that in this embodiment, the quantum dot light-emitting unit 10 is an electroluminescent quantum dot, and the quantum dot layer 30 is a photoluminescent quantum dot.

[0044] In the backlight structure 100 provided in this application, the quantum dot light-emitting unit 10 is used to emit a first light. The light guide plate 20 includes a light-emitting surface and a back surface arranged opposite to each other, and a plurality of side surfaces surrounding the light-emitting surface. The quantum dot light-emitting unit 10 is disposed within the light guide plate 20 and close to the side surface, or disposed on the back surface. The light guide plate 20 is used to homogenize the first light emitted by the quantum dot light-emitting unit 10 and emit it along a direction perpendicular to the light-emitting surface. The quantum dot layer 30 is at least partially disposed on the light-emitting surface. The quantum dot layer 30 is used to receive the first light and convert it into a second light for emission. The quantum dot light-emitting unit 10 is directly connected to the light guide plate 20 so that all the first light emitted by the quantum dot light-emitting unit 10 can enter the light guide plate 20, which can prevent the first light emitted by the quantum dot light-emitting unit 10 from leaking out from other areas of the display device 1, avoid light leakage in the display device 1, and reduce the probability of color distortion on the sides of the display device 1.

[0045] Furthermore, by directly placing the quantum dot light-emitting unit 10 within the light guide plate 20, space can be saved for the light-emitting unit, allowing for a narrower bezel on the display device 1. This reduces the area of ​​the non-display region in the display device 1, improving the overall display effect. Moreover, by directly placing the quantum dot light-emitting unit 10 within the light guide plate 20, there is no need for lamp boards, substrates, or other structural components, which helps reduce the weight of the backlight structure 100 and the display device 1, thus improving the thinness and lightness of the display device 1.

[0046] Please refer to Figure 3 , Figure 3 This is a cross-sectional schematic diagram of a backlight structure provided in Embodiment 3 of this application. In this embodiment, the quantum dot layer 30 can be disposed on both the light-emitting surface and the back surface of the light guide plate 20. The quantum dot layers 30 on both sides can be used to receive the first light and convert it into the second light for emission, so that the backlight structure 100 can emit light from both sides, thereby enabling the display device to be used with the backlight structure 100 to perform double-sided display, thereby improving the application field and effect of the backlight structure 100.

[0047] Please refer to Figure 4 , Figure 4 This is a top view schematic diagram of a backlight structure provided in Embodiment 1 of this application. When the quantum dot light-emitting unit 10 is directly disposed in the light guide plate 20, the plurality of quantum dot light-emitting units 10 are all disposed on one side of the light guide plate 20 and emit the first light towards the interior of the light guide plate 20. The backlight structure 100 is a side-lit backlight structure.

[0048] Please refer to Figure 5, Figure 5 This is a schematic diagram of a backlight structure including a first groove, provided in Embodiment 1 of this application. In one embodiment, the quantum dot light-emitting unit 10 is disposed within the light guide plate 20. Optionally, a first groove 21 is provided in the region of the light-emitting surface near the side, the first groove 21 being used to accommodate the quantum dot light-emitting unit 10; or, a second groove is provided on the side, the second groove being used to accommodate the quantum dot light-emitting unit 10.

[0049] In one embodiment, a first groove 21 is provided in the region of the light-emitting surface near the side. In other words, the first groove 21 is formed in the region of the light-emitting surface near the side. The first groove 21 is used to accommodate the quantum dot light-emitting unit 10, and the number of the first grooves 21 is the same as the number of the quantum dot light-emitting units 10.

[0050] The light guide plate 20 is further provided with through holes 23 and edge notches 24. The through holes 23 allow external electrical connection lines to enter and electrically connect to the anode 17 of the quantum dot light-emitting unit 10, and also allow external electrical connection lines to enter and electrically connect to the cathode 11 of the quantum dot light-emitting unit 10, so that the quantum dot light-emitting unit 10 can be electrically connected to the driver IC of the display device 1 and perform electroluminescence. Further, in one embodiment, the through holes 23 and the edge notches 24 penetrate multiple of the first grooves 21, and can be used to electrically connect the multiple quantum dot light-emitting units 10.

[0051] Similarly, in another embodiment, the side surface is provided with a second groove. In other words, the second groove is formed on the side surface and is used to accommodate the quantum dot light-emitting unit 10. The number of the second grooves is the same as the number of the quantum dot light-emitting units 10. Similarly, in this embodiment, the light guide plate 20 can also be provided with through holes 23 and edge notches 24, as described above, and will not be repeated here.

[0052] It should be noted that, in one embodiment of this application, the backlight structure 100 is prepared by first opening the first groove 21 or the second groove in the light guide plate 20, and forming the quantum dot light-emitting unit 10 in the first groove 21 or the second groove. In other embodiments, the backlight structure 100 can also be prepared by other preparation methods, and this application does not limit it.

[0053] Please refer to Figure 6 , Figure 6 This is a schematic cross-sectional view of a backlight structure provided in Embodiment 1 of this application. Figure 2In one embodiment, the quantum dot light-emitting unit 10 includes a cathode 11, an electron injection layer 12, an electron transport layer 13, a light-emitting layer 14, a hole transport layer 15, a hole injection layer 16, and an anode 17 arranged sequentially.

[0054] The primary function of the cathode 11 is to provide electrons and inject them into the electron transport layer 13. The cathode 11 is the source of electrons, responsible for providing electrons to the quantum dot light-emitting unit 10 to support the electron flow during the light emission process of the quantum dot light-emitting unit 10. The primary function of the electron injection layer 12 is to reduce the difficulty of injecting electrons from the cathode 11 into the electron transport layer 13.

[0055] The primary function of the electron transport layer 13 is to transport electrons, ensuring their smooth transfer from the electron injection layer 12 to the light-emitting layer 14. The electron transport layer 13 has a high electron mobility to effectively transport electrons and reduce electron loss during transport. The light-emitting layer 14 is the core component of the quantum dot light-emitting unit 10. It is responsible for recombinating electrons and holes to generate photons, thereby emitting visible light. The hole transport layer 15 transports holes, allowing them to smoothly reach the light-emitting layer 14 from the hole injection layer 16. The hole transport layer 15 has a high hole mobility to balance the flow of electrons and holes, improving luminous efficiency. The primary function of the hole injection layer 16 is to reduce the difficulty of injecting holes from the anode 17 into the hole transport layer 15. The anode 17 is the source of holes, responsible for providing holes to the device. The anode 17 and the cathode 11 together form a current loop, providing the necessary electrical energy for the entire light-emitting process.

[0056] The material of the light-emitting layer 14 includes cadmium-based materials and / or perovskite quantum dot materials. Cadmium-based materials and perovskite quantum dot materials are inorganic light-emitting materials. Inorganic light-emitting materials generally have higher luminous efficiency, meaning that under the same energy input, inorganic light-emitting materials can produce more light output compared to organic light-emitting materials. Secondly, inorganic light-emitting materials generally have a longer lifespan. Compared to organic light-emitting materials, inorganic light-emitting materials have better durability and stability, and can maintain stable luminous performance during long-term use.

[0057] In one embodiment, the cathode 11, the electron injection layer 12, the electron transport layer 13, the light-emitting layer 14, the hole transport layer 15, the hole injection layer 16, and the anode 17 are arranged along the horizontal direction of the light guide plate 20.

[0058] In this embodiment, the light-emitting layer 14 is rectangular in shape, and the long side of the light-emitting layer 14 is arranged to correspond to the short side of the light guide plate 20. The second light emitted by the light-emitting layer 14 is emitted more along the horizontal direction of the light guide plate 20, which makes it easier for the second light emitted by the light-emitting layer 14 to be conducted to the side away from the quantum dot light-emitting unit 10, thus avoiding uneven light emission and other phenomena in the light guide plate 20.

[0059] In this embodiment, the light-emitting layer 14 is a blue quantum dot 143, and the light-emitting layer 14 is used to emit blue light. Optionally, in other embodiments, the light-emitting layer 14 may also be other types of quantum dots, and this application does not limit this. For example, please refer to... Figure 7 , Figure 7 This is a cross-sectional schematic diagram of a backlight structure provided in Embodiment 4 of this application. In one embodiment, the light-emitting layer 14 includes red quantum dots 141, green quantum dots 142, and blue quantum dots 143. The light-emitting layer 14 is used to emit white light. Specifically, the red quantum dots 141 are used to electro-excite red light, the green quantum dots 142 are used to electro-excite green light, and the blue quantum dots 143 are used to electro-excite blue light. The red, green, and blue light are mixed to form white light.

[0060] An blocking layer is provided between the red quantum dot 141 and the green quantum dot 142, and an blocking layer is provided between the green quantum dot 142 and the blue quantum dot 143. The blocking layers are used to isolate adjacent quantum dots and prevent impurities in the excited light caused by contact between adjacent quantum dots.

[0061] Please refer to Figure 6 In one embodiment, the quantum dot layer 30 includes a first protective layer 31, a quantum dot material layer 32, and a second protective layer 33 stacked sequentially, wherein the materials of the first protective layer 31 and the second protective layer 33 include polyacrylate, epoxy resin, or silicone.

[0062] The first protective layer 31 and the second protective layer 33 can be used to isolate the quantum dot material layer 32 from the external environment, prevent water and oxygen in the external environment from corroding the quantum dot layer 30, and improve the service life of the quantum dot layer 30.

[0063] In this embodiment, the quantum dot layer 30 is prepared by first coating the second protective layer 33 onto the light guide plate 20, then printing the quantum dot ink multiple times to form a quantum dot material layer 32 with uniform thickness, and finally encapsulating the first protective layer 31 onto the quantum dot material layer 32.

[0064] The quantum dot material layer 32 comprises cadmium-based and / or perovskite materials. Cadmium-based materials and perovskite quantum dot materials are inorganic light-emitting materials, which can produce more light output compared to organic light-emitting materials. Organic light-emitting materials typically have a longer lifespan. Compared to organic light-emitting materials, inorganic light-emitting materials have better durability and stability, and can maintain stable luminescent performance during long-term use.

[0065] Please refer to Figure 1 and Figure 2 In one embodiment, the quantum dot layer 30 is at least partially disposed on the side of the light guide plate 20 to block light inside the light guide plate 20 from escaping from the side, which is beneficial to improving the light utilization rate inside the light guide plate 20.

[0066] Please refer to Figure 8 , Figure 8 This is a schematic diagram of the back structure of a light guide plate according to Embodiment 1 of this application. In one embodiment, the back of the light guide plate 20 is provided with a dot structure, which is used to reflect or refract light inside the light guide plate 20 and cause it to be emitted in a direction perpendicular to the light emitting surface.

[0067] Please refer to Figure 2 In one embodiment, when the quantum dot light-emitting units 10 are arranged in an array on the back side of the light guide plate 20, an insulating layer is provided between two adjacent quantum dot light-emitting units 10. This insulating layer isolates adjacent quantum dots, preventing contact between adjacent quantum dots and thus avoiding impurities in the excited light. The backlight structure 100 also includes a circuit layer disposed between the light guide plate 20 and the plurality of quantum dot light-emitting units 10, for providing electrical signals to the quantum dot light-emitting units 10. The backlight structure 100 also includes a protective layer disposed on the side of the plurality of quantum dot light-emitting units 10 facing away from the light guide plate 20, and this protective layer isolates the quantum dot light-emitting units 10 from the external environment, preventing water and oxygen from corroding the quantum dot light-emitting units 10.

[0068] Please refer to Figure 9 , Figure 9 This is a schematic diagram of the structure of a display device provided in Embodiment 5 of this application. This application also provides a backlight module 1000, which includes a back plate 40, a middle frame 41 and the backlight structure 100. The backlight structure 100 is disposed on the back plate 40, and the middle frame 41 surrounds the outer periphery of the back plate 40. The middle frame 41 is used to set the display panel 200.

[0069] In one embodiment, the backlight module 1000 further includes an optical film layer 42. The back plate 40 includes a base plate and a side plate surrounding the base plate. The backlight structure 100 is disposed on the base plate. The optical film layer 42 is fixed to the side plate and is disposed on the side of the backlight structure 100 away from the base plate. The optical film layer 42 is used to homogenize the visible light emitted by the backlight structure 100 to improve the uniformity of the light emitted by the backlight module 1000.

[0070] In the backlight module 1000 provided in this application, the quantum dot light-emitting unit 10 is used to emit a first light. The quantum dot light-emitting unit 10 is disposed within the light guide plate 20 and close to the side, or disposed on the back side. The light guide plate 20 is used to homogenize the first light emitted by the quantum dot light-emitting unit 10 and emit it along a direction perpendicular to the light-emitting surface. The quantum dot layer 30 is at least partially disposed on the light-emitting surface. The quantum dot layer 30 is used to receive the first light and convert it into a second light for emission. The quantum dot light-emitting unit 10 is directly connected to the light guide plate 20 so that the first light emitted by the quantum dot light-emitting unit 10 can all enter the light guide plate 20. This can prevent the first light emitted by the quantum dot light-emitting unit 10 from leaking out from the gap between the middle frame 41 and the light guide plate 20, thus avoiding light leakage in the display device 1 and reducing the probability of color distortion on the sides of the display device 1.

[0071] This application also provides a display device 1, which includes a display panel 200 and the backlight module 1000, wherein the display panel 200 is disposed on the middle frame 41.

[0072] Optionally, the display device 1 may include, but is not limited to, a computer, a mobile phone, a large monitor, or other display devices.

[0073] In one embodiment, the display panel 200 includes a privacy film 43 and a dispersed liquid crystal layer 44, the privacy film 43 and the dispersed liquid crystal layer 44 working together to enable the display of the display device 1 to achieve both a privacy viewing angle and a sharing viewing angle.

[0074] The display device 1 also includes light-shielding tape 45, which is used to block areas where light is not required to pass through, preventing light leakage from the sides of the display device 1. The display device 1 also includes edge-sealing shielding tape 56, which is used to seal and fix the middle frame 41 and the back plate 40, preventing moisture from the external environment from entering the interior of the display device 1 and affecting its service life.

[0075] In the display device 1 provided in this application, the quantum dot light-emitting unit 10 is used to emit a first light. The quantum dot light-emitting unit 10 is disposed within the light guide plate 20 and close to the side, or disposed on the back side. The light guide plate 20 is used to homogenize the first light emitted by the quantum dot light-emitting unit 10 and emit it along a direction perpendicular to the light-emitting surface. The quantum dot layer 30 is at least partially disposed on the light-emitting surface. The quantum dot layer 30 is used to receive the first light and convert it into a second light for emission. The quantum dot light-emitting unit 10 is directly connected to the light guide plate 20 so that all the first light emitted by the quantum dot light-emitting unit 10 can enter the light guide plate 20, which can prevent the first light emitted by the quantum dot light-emitting unit 10 from leaking out from other areas of the display device 1, avoid light leakage in the display device 1, and thus reduce the probability of color distortion on the sides of the display device 1.

[0076] The above description represents some embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

Claims

1. A backlight structure, characterized in that, include: Quantum dot light-emitting units are used to emit the first light rays; A light guide plate includes a light-emitting surface and a back surface arranged opposite to each other, and a plurality of side surfaces surrounding the light-emitting surface. The quantum dot light-emitting unit is disposed in the light guide plate and close to the side surface, or the quantum dot light-emitting unit is disposed on the back surface. The light guide plate is used to homogenize the first light emitted by the quantum dot light-emitting unit and emit it in a direction perpendicular to the light-emitting surface. as well as A quantum dot layer, at least partially disposed on the light-emitting surface, is used to receive the first light ray and convert it into a second light ray for emission.

2. The backlight structure according to claim 1, characterized in that, The quantum dot layer is at least partially disposed on the side of the light guide plate to block light from escaping from the side of the light guide plate.

3. The backlight structure according to claim 1, characterized in that, At least a portion of the quantum dot layer is disposed on the back side of the light guide plate.

4. The backlight structure according to claim 2, characterized in that, The light-emitting surface near the side has a first groove, which is used to accommodate the quantum dot light-emitting unit; or, the side has a second groove, which is used to accommodate the quantum dot light-emitting unit.

5. The backlight structure according to claim 1, characterized in that, The quantum dot light-emitting unit includes a cathode, an electron injection layer, an electron transport layer, a light-emitting layer, a hole transport layer, a hole injection layer, and an anode arranged sequentially; wherein the cathode, the electron injection layer, the electron transport layer, the light-emitting layer, the hole transport layer, the hole injection layer, and the anode are arranged along the horizontal direction of the light guide plate.

6. The backlight structure according to claim 5, characterized in that, The light-emitting layer includes red quantum dots, green quantum dots, and blue quantum dots, with a blocking layer between the red quantum dots and the green quantum dots, and a blocking layer between the green quantum dots and the blue quantum dots.

7. The backlight structure according to claim 1, characterized in that, The quantum dot layer includes a first protective layer, a quantum dot material layer, and a second protective layer stacked sequentially.

8. A backlight module, characterized in that, The device includes a back panel, a middle frame, and a backlight structure as described in any one of claims 1-7. The backlight structure is disposed on the back panel, and the middle frame surrounds the outer periphery of the back panel. The middle frame is used to house the display panel.

9. A display device, characterized in that, It includes a display panel and the backlight module as described in claim 8, wherein the display panel is disposed on the middle frame.

10. The display device according to claim 9, characterized in that, The display panel includes a privacy film and a dispersed liquid crystal layer, which work together to enable the display device to achieve both a privacy viewing angle and a sharing viewing angle.

Images