Backlight module and display device

Abstract

The invention provides a backlight module and a display device, and belongs to the technical field of display. The light-emitting source is arranged on the back plate, and the light-emitting source can emit first light rays; the light guide plate is arranged on the back plate, and the luminous source is located on one side of the light guide plate; the light diffusion layer is arranged on the side, away from the back plate, of the light guide plate, and the light diffusion layer comprises multiple device layers which are arranged in a stacked mode; wherein a fluorescent layer is formed on at least one device layer in the multiple device layers, and the fluorescent layer is used for exciting the first light into second light. According to the backlight module and the display device provided by the invention, the color cast problem of a display product can be improved, and the use experience of a user is improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a backlight module and a display device. Background Art

[0002] LCD (Liquid Crystal Display) is a flat panel display technology, the basic principle of which is to display images by using liquid crystal materials. LCD has been widely used in various fields due to its advantages such as lightness, energy saving, environmental protection and easy mass production. For example, in the field of displays, LCD has become one of the mainstream display technologies and is widely used in devices such as computer monitors, televisions, tablets and smart phones. In addition, LCD also plays an important role in industrial automation, medical equipment, aerospace and other fields.

[0003] At present, LCD display products have the problem of color cast (i.e. the picture tends to be a certain color, such as yellowish), which affects the user experience. Summary of the invention

[0004] The present application provides a backlight module and a display device, aiming to improve the color cast problem of display products and enhance the user experience.

[0005] A first aspect of an embodiment of the present application provides a backlight module, including: Back panel; A light source, disposed on the back plate, and capable of emitting a first light; A light guide plate, disposed on the back plate, and the light source is located on one side of the light guide plate; A light scattering layer is arranged on a side of the light guide plate away from the back plate, and the light scattering layer includes a plurality of device layers stacked in layers; Wherein, a fluorescent layer is formed on at least one device layer of the multi-layer device layers, and the fluorescent layer is used to excite the first light into the second light; The wavelength band of the first light is 360nm-420nm, and the wavelength band of the second light is 450nm-470nm.

[0006] Optionally, the multi-layer device layer includes a first diffusion layer, a first prism layer, a second prism layer and a second diffusion layer which are stacked in sequence, and the first diffusion layer is arranged close to the light guide plate; Wherein, the fluorescent layer is arranged on the second diffusion layer.

[0007] Optionally, the second diffusion layer includes a substrate layer and a diffusion particle layer and a back-coating particle layer respectively disposed on both sides of the substrate layer; Wherein, the fluorescent layer is arranged on a side of the diffusion particle layer away from the substrate layer; Alternatively, the fluorescent layer is disposed between the diffusion particle layer and the substrate layer.

[0008] Optionally, the multi-layer device layer includes a diffusion layer, a first prism layer, and a second prism layer stacked in sequence, and the diffusion layer is arranged close to the light guide plate; Wherein, the fluorescent layer is arranged on the second prism layer.

[0009] Optionally, the second prism layer includes a substrate layer, and a prism body layer and a back-coated particle layer respectively disposed on both sides of the substrate layer; Wherein, the fluorescent layer is arranged between the substrate layer and the prism body layer.

[0010] Optionally, in a direction from a side close to the light source to a side far from the light source, the fluorescent layer includes a plurality of regions, and a gram weight per square micrometer of the fluorescent layer in the plurality of regions gradually increases.

[0011] Optionally, the fluorescent layer includes a first portion, a second portion connected to the first portion, and a third portion connected to the second portion, and the first portion is closest to the light source; The grammage per square micrometer of the fluorescent layer increases sequentially in the first part, the second part and the third part.

[0012] Optionally, a ratio of gram weight per square micrometer of the fluorescent layer in the first part, the second part and the third part is 1:5:10.

[0013] Optionally, a fluorescent layer is provided in the mesh points of the light guide plate.

[0014] A second aspect of the embodiments of the present application provides a display device, comprising the backlight module provided in the first aspect of the embodiments of the present application.

[0015] Beneficial effects: The present application provides a backlight module and a display device, wherein the backlight module includes a back panel, a light source, a light guide plate and a light scattering layer, wherein the light source can emit a first light, the light scattering layer includes a plurality of device layers, at least one device layer of the plurality of device layers is formed with a fluorescent layer, the fluorescent layer is used to excite the first light into a second light, and the wavelength band of the first light is 360nm-420nm, and the wavelength band of the second light is 450nm-470nm; in this way, by using the fluorescent layer to compensate for the blue light lost during the light transmission process, the color cast problem of the display product can be improved, and the user experience can be enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0017] Figure 1 is a schematic structural diagram of a backlight module including a first diffusion layer, a second diffusion layer, a first prism layer and a second prism layer proposed in one embodiment of the present application; Figure 2 is a schematic structural diagram of a backlight module including a diffusion layer, a first prism layer and a second prism layer proposed in one embodiment of the present application; Figure 3 It is a structural schematic diagram of a diffusion layer of a fluorescent layer on a diffusion particle layer in a backlight module proposed in one embodiment of the present application; Figure 4 It is a schematic structural diagram of a diffusion layer in a backlight module proposed in one embodiment of the present application, in which a fluorescent layer is provided between a diffusion particle layer and a substrate layer; Figure 5 It is a schematic structural diagram of a prism layer in a backlight module proposed in one embodiment of the present application, in which a fluorescent layer is provided between a prism body layer and a substrate layer; Figure 6 It is a schematic diagram of the structure of a fluorescent layer with different coating densities in a backlight module proposed in one embodiment of the present application; Figure 7 It is a structural schematic diagram of a light guide plate in a backlight module proposed in one embodiment of the present application.

[0018] Explanation of the reference numerals: 10, back panel; 20, light source; 30, light guide plate; 40, light scattering layer; 41, device layer; 411, diffusion layer; 4111, substrate layer; 4112, diffusion particle layer; 4113, back-coated particle layer; 412, prism layer; 4121, substrate layer; 4122, prism body layer; 4123, back-coated particle layer; 50, fluorescent layer; 51, first part; 52, second part; 53, third part. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] In the related technology, the light-emitting mode of LCD display products is that the light-emitting chip emits blue light to excite the yellow phosphor to form white light. However, when the light passes through the light guide plate, diffusion layer and prism layer, the blue light will be absorbed, causing the picture of the LCD display product to appear yellowish, and the farther away from the LED, the greater the color deviation.

[0021] In view of this, an embodiment of the present application proposes a backlight module to improve the problem of color shift of a display product image.

[0022] Reference Figure 1 and Figure 2 As shown, a backlight module disclosed in an embodiment of the present application includes a back panel 10 , a light source 20 , a light guide plate 30 and a light diffusion layer 40 .

[0023] Specifically, the back plate 10 may include a bottom plate and a side plate located at at least one side of the bottom plate, and the side plate and the bottom plate are perpendicular to each other, so that the side plate and the bottom plate can enclose a receiving area for receiving various components of the backlight module. The material of the back plate can be aluminum alloy or stainless steel.

[0024] The light source 20 is a unit that provides light in the backlight module. The light source 20 is usually arranged on a side plate on one side of the back plate, and emits light in a direction away from the side plate. The light source 20 can be a whole LED (Light-Emitting Diode) light strip, and the LED light strip is fixed to the side plate on one side of the back plate by gluing. In the embodiment of the present application, the light source 20 can at least emit a first light.

[0025] The light guide plate 30 is disposed on the bottom plate of the back plate 10, and the light source 20 is located on one side of the light guide plate 30. The light guide plate 30 can guide the light emitted by the light source 20 and diverge in a direction perpendicular to the bottom plate to achieve the lighting effect of the backlight module. The light guide plate 30 can be fixed to the bottom plate of the back plate 10 by gluing.

[0026] The light scattering layer 40 is arranged on the side of the light guide plate 30 away from the back plate 10. The main function of the light scattering layer 40 is to further scatter the light guided by the light guide plate 30. The light scattering layer 40 can include multiple stacked device layers 41, and the number of device layers 41 is different in backlight modules with different structures.

[0027] For example, refer to Figure 1 As shown, in one embodiment, the multilayer device layer 41 may include a first diffusion layer 401, a second diffusion layer 402, a first prism layer 403 and a second prism layer 404, wherein the first prism layer 403 and the second prism layer 404 are arranged between the first diffusion layer 401 and the second diffusion layer 402, and the first prism layer 403 is closer to the back plate than the second prism layer 404.

[0028] For example, refer to Figure 2 As shown, in one embodiment, the multilayer device layer 41 may include a diffusion layer 401, a first prism layer 402 and a second prism layer 403 stacked in sequence, wherein the diffusion layer 401 is arranged on a side of the light guide plate 30 away from the bottom plate of the back plate 10.

[0029] Reference Figure 3 As shown, in the embodiment of the present application, a fluorescent layer 50 is formed on at least one device layer 41 of the multilayer device layer 41, and the fluorescent layer 50 can excite the first light emitted by the light source 20 into a second light. Exemplarily, the embodiment of the present application needs to compensate for the loss of blue light during the propagation process, so the color of the second light can be blue, and the color of the first light that can excite the fluorescent layer can be purple, that is, the light source 20 emits a purple first light, and when the purple first light passes through the fluorescent layer 20, the fluorescent layer 50 can excite the purple first light into a blue second light. In the embodiment of the present application, the first light that excites the second light can also be ultraviolet light, so it can be understood that the wavelength band of the first light can be 360nm-420nm, and the light in this wavelength band is purple light or ultraviolet light; and the wavelength band of the second light is 450nm-470nm, and the light in this wavelength band is blue light.

[0030] In this way, the fluorescent layer 50 in the device layer 41 can compensate for the blue light absorbed by impurities in the film material during the light transmission process, thereby improving the color deviation problem of the display product, making the color uniformity of the display product higher and improving the user experience.

[0031] It is understandable that the fluorescent layer 50 can be disposed on the diffusion layer 411 in the device layer 41, or on the prism layer 412. However, the more layers the blue light passes through, the more it is absorbed. Therefore, in consideration of the accuracy of the blue light compensation amount, the process and cost, the fluorescent layer 50 can be disposed on the topmost device layer 41 in the device layer 41 according to the design; of course, the fluorescent layer 50 can also be disposed on the middle device layer 41 in the device layer 41, but in this case, it is necessary to consider the amount of blue light absorbed by the device layer 41 above the device layer 41.

[0032] Reference Figure 1 and Figure 3As shown, in an optional implementation, the embodiment of the present application also provides a backlight module, in which the multilayer device layer 41 may include a first diffusion layer 401, a second diffusion layer 402, a first prism layer 403 and a second prism layer 404, wherein the first prism layer 403 and the second prism layer 404 are arranged between the first diffusion layer 401 and the second diffusion layer 402, and the first prism layer 403 is closer to the back panel than the second prism layer 404.

[0033] Specifically, the fluorescent layer is disposed in the second diffusion layer 402. Since the second diffusion layer 402 is located at the top of the multi-layer device layer 41, the blue light of the laser of the fluorescent layer 50 can be prevented from being absorbed again, thereby ensuring the compensation effect of the fluorescent layer 50 on the blue light.

[0034] At the same time, refer to Figure 3 As shown, in the backlight module, the second diffusion layer 402 includes a substrate layer 4111 , a diffusion particle layer 4112 and a back-coated particle layer 4113 .

[0035] Specifically, the diffusion particle layer 4112 and the back-coated particle layer 4113 are respectively arranged on both sides of the substrate layer 4111, wherein the diffusion particle layer 4112 is connected to the substrate layer 4111 by gluing, and the diffusion particle layer 4112 can diffuse light. At the same time, in this embodiment, the fluorescent layer 50 is arranged on the side of the diffusion particle layer 4112 away from the substrate layer 4111. In this way, the light can be excited into a specific color by the fluorescent layer 50 after diffusion, so that the excitation effect of the light is better.

[0036] Reference Figure 4 As shown, in one embodiment, the fluorescent layer 50 may also be disposed between the diffusion particle layer 4112 and the substrate layer 4111. Since the diffusion particles in the diffusion particle layer 4112 are spherical with uneven sizes, if the fluorescent layer 50 is directly coated on the diffusion particle layer 4112, the coating density of the fluorescent layer 50 will be difficult to control due to the uneven surface of the diffusion particle layer 4112, and the fluorescent layer 50 is also exposed to the outside, which is easy to cause wear of the fluorescent layer 50; however, if the fluorescent layer 50 is disposed between the diffusion particle layer 4112 and the substrate layer 4111, the coating density of the fluorescent layer 50 can be more easily controlled, and the fluorescent layer 50 can also be protected by the diffusion particle layer 4112.

[0037] Reference Figure 2 and Figure 5 As shown, in an optional implementation, the embodiment of the present application also provides a backlight module, in which the multi-layer device layer 41 may include a diffusion layer 401, a first prism layer 402 and a second prism layer 403 stacked in sequence, wherein the diffusion layer 401 is arranged on the side of the light guide plate 30 away from the bottom plate of the back plate 10.

[0038] Specifically, the fluorescent layer 50 is disposed in the second prism layer 403. Since the second prism layer 403 is located at the top of the multilayer device layer 41, the blue light of the laser of the fluorescent layer 50 can be prevented from being absorbed again, thereby ensuring the compensation effect of the fluorescent layer 50 on the blue light.

[0039] Meanwhile, the second prism layer includes a substrate layer 4121 , a prism body layer 4122 and a back-coated particle layer 4123 .

[0040] Specifically, the prism body layer 4122 and the back-coated particle layer 4123 are respectively arranged on both sides of the substrate layer 4121, and the prism body layer 4122 can be connected to the substrate layer 4121 by gluing, and the prism body layer 4122 can diffuse light. At the same time, in this embodiment, the fluorescent layer 50 is arranged between the prism body layer 4122 and the substrate layer 4121, so that the prism body layer 4122 can be used to protect the fluorescent layer 50, thereby preventing the fluorescent layer 50 from being exposed to the outside and causing wear, thereby ensuring the excitation effect of the fluorescent layer 50.

[0041] Reference Figure 6 As shown, in an optional implementation, the embodiment of the present application also provides a backlight module, in which the fluorescent layer 50 includes a plurality of regions in a direction from a side close to the light source 20 to a side far from the light source 20, and the gram weight per square micron of the fluorescent layer 50 in the plurality of regions gradually increases.

[0042] Specifically, in the measured data, the color coordinates are the largest and the color deviation is greater at the position far from the light source 20. That is to say, in the display product, the color deviation is lighter at the position close to the light source 20, and the farther away from the light source 20, the heavier the color deviation is.

[0043] Therefore, in the embodiment of the present application, the coating density of the fluorescent layer 50 at different positions is different. It can be understood that the fluorescent layer 50 is formed on the device layer by a coating process, and its coating density can be understood as the number of times the fluorescent layer 50 is coated, that is, the more times the fluorescent layer 50 is coated, the greater the coating density of the fluorescent layer 50. From another perspective, the more times the fluorescent layer 50 is coated, the greater the gram weight of the fluorescent layer 50 per square micron.

[0044] In view of the color shift of the display product, the coating density of the fluorescent layer 50 in the embodiment of the present application is the smallest in the area close to the light source 20 on the device layer 41, and the coating density of the fluorescent layer 50 gradually increases with the increase of the distance from the light source 20. In this way, the blue light can be accurately compensated in the display product according to the severity of the color shift, thereby ensuring the uniformity of the display screen of the display product.

[0045] Reference Figure 6 As shown, in an optional implementation, the embodiment of the present application further provides a backlight module, in which the fluorescent layer 50 includes a first portion 51 , a second portion 52 and a third portion 53 .

[0046] Specifically, the first part 51, the second part 52 and the third part 53 are connected in sequence, and the areas of the first part 51, the second part 52 and the third part 53 can be the same, and the distance between the first part 51 and the light source 20 is the shortest, and the distance between the third part 53 and the light source 20 is the farthest. In this embodiment, the weight of the fluorescent layer 50 in each square micrometer gradually increases in the first part 51, the second part 52 and the third part 53 ( Figure 5 The circular dots in the middle are used to indicate the distribution density of the fluorescent layer 50). That is, the gram weight per square micron of the fluorescent layer 50 in the first part 51 is the smallest, the gram weight per square micron of the fluorescent layer 50 in the second part 52 is greater than the gram weight per square micron of the first part 51, and the gram weight per square micron of the fluorescent layer 50 in the third part 53 is greater than the gram weight per square micron of the first part 51 and the second part 52.

[0047] In this way, the fluorescent layer 50 is equally divided into three parts, which makes it more convenient to coat the fluorescent layer 50 and can more specifically perform blue light compensation on different parts of the display product.

[0048] It is understandable that in some embodiments, the fluorescent layer 50 can also be divided into more parts, for example, the fluorescent layer 50 can be divided into four or five parts, and the coating density of the fluorescent layer 50 in each part is different (also following the rule that the farther the distance from the light source 20, the greater the coating density).

[0049] In one embodiment, the ratio of the gram weight per square micrometer of the fluorescent layer 50 in the first part 51, the second part 52 and the third part 53 is 1:5:10. For example, the gram weight per square micrometer of the fluorescent layer 50 in the first part 51 is 1, the gram weight per square micrometer of the fluorescent layer 50 in the second part 52 is 5, and the gram weight per square micrometer of the fluorescent layer 50 in the third part 53 is 10. In this way, the blue light can be accurately compensated in the display product according to the severity of the color shift, thereby ensuring the uniformity of the display screen of the display product.

[0050] It should be noted that the distribution density ratio is only used in the embodiments of the present application. In actual applications, the coating density of the fluorescent layer needs to be calculated based on the material used in the film model and the blue light absorption rate of the glue formula.

[0051] Reference Figure 7As shown, in one embodiment, in addition to adding the fluorescent layer 50 in the device layer 41, the fluorescent layer 50 can also be added in the dots of the light guide plate 30. And, like the arrangement of the dot density of the conventional light guide plate 30, the distribution trend of the fluorescent layer 50 is also from sparse to dense from the light incident side to the light exit side of the light guide plate 30.

[0052] Based on the same inventive concept, an embodiment of the present application discloses a display device, comprising any backlight module as described above in the embodiment of the present application.

[0053] Specifically, the display device may include a computer monitor, a television, a billboard, a laser printer with a display function, a telephone, a mobile phone, a personal digital assistant (PDA), a laptop computer, a digital camera, a camcorder, a viewfinder, a vehicle, a large-area wall, a theater screen, or a stadium sign, etc.

[0054] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0055] It should also be noted that, in this article, the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations, nor can they be understood as indicating or implying relative importance. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. Without more restrictions, an element defined by the phrase "comprising a ..." does not exclude the existence of other identical elements in the process, method, article or terminal device comprising the element.

[0056] The technical solution provided by the present application is described in detail above. The principle and implementation method of the present application are described in this article using specific examples. The description of the above embodiments is only used to help understand the present application, and the content of this specification should not be understood as limiting the present application. At the same time, for those of ordinary skill in the art, according to the present application, there will be different forms of changes in the specific implementation methods and application scopes. It is not necessary and impossible to list all the implementation methods here, and the obvious changes or modifications derived therefrom are still within the scope of protection of the present application.

Claims

1. A backlight module, characterized in that: include: Back panel; A light source, disposed on the back plate, and capable of emitting a first light; A light guide plate, disposed on the back plate, and the light source is located on one side of the light guide plate; A light scattering layer is arranged on a side of the light guide plate away from the back plate, and the light scattering layer includes a plurality of device layers stacked in layers; Wherein, a fluorescent layer is formed on at least one device layer of the multi-layer device layers, and the fluorescent layer is used to excite the first light into the second light; The wavelength band of the first light is 360nm-420nm, and the wavelength band of the second light is 450nm-470nm.

2. The backlight module according to claim 1, characterized in that: The multi-layer device layer comprises a first diffusion layer, a first prism layer, a second prism layer and a second diffusion layer which are stacked in sequence, and the first diffusion layer is arranged close to the light guide plate; Wherein, the fluorescent layer is arranged on the second diffusion layer.

3. The backlight module according to claim 2, characterized in that: The second diffusion layer includes a substrate layer and a diffusion particle layer and a back-coating particle layer respectively arranged on both sides of the substrate layer; Wherein, the fluorescent layer is arranged on a side of the diffusion particle layer away from the substrate layer; Alternatively, the fluorescent layer is disposed between the diffusion particle layer and the substrate layer.

4. The backlight module according to claim 1, characterized in that: The multi-layer device layer comprises a diffusion layer, a first prism layer, and a second prism layer which are stacked in sequence, and the diffusion layer is arranged close to the light guide plate; Wherein, the fluorescent layer is arranged on the second prism layer.

5. The backlight module according to claim 4, characterized in that: The second prism layer includes a substrate layer and a prism body layer and a back-coated particle layer respectively arranged on both sides of the substrate layer; Wherein, the fluorescent layer is arranged between the substrate layer and the prism body layer.

6. The backlight module according to claim 1, characterized in that: In a direction from a side close to the light source to a side far from the light source, the fluorescent layer includes a plurality of regions, and the gram weight per square micrometer of the fluorescent layer in the plurality of regions gradually increases.

7. The backlight module according to claim 6, characterized in that: The fluorescent layer comprises a first portion, a second portion connected to the first portion, and a third portion connected to the second portion, and the first portion is closest to the light source; The grammage per square micrometer of the fluorescent layer increases sequentially in the first part, the second part and the third part.

8. The backlight module according to claim 7, characterized in that: The ratio of the gram weight per square micrometer of the fluorescent layer in the first part, the second part and the third part is 1:5:

10.

9. The backlight module according to claim 1, characterized in that: A fluorescent layer is arranged in the mesh points of the light guide plate.

10. A display device, characterized in that: It comprises the backlight module as described in any one of claims 1 to 9.

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