Backlight module and display device

Abstract

The application relates to the technical field of backlight modules, and discloses a backlight module and a display device. A certain proportion of blue dye is arranged in an optical component of the backlight module, the proportion of blue light in the backlight module is increased, and a blue shift phenomenon of color points of the backlight module is actively caused; meanwhile, green fluorescent powder is doped in yellow fluorescent powder of a conventional LED, the proportion of green light in the backlight module is increased, and the color points are corrected and the above blue shift is offset; the addition of the green fluorescent powder in the LED can improve the light-emitting efficiency of the LED, and the overall brightness of the backlight module is improved; according to the above principle, a scheme can be matched according to requirements, the effect of brightness improvement of the backlight module is achieved, and an extreme cost design scheme is realized.

Description

TECHNICAL FIELD

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

[0002] In a conventional backlight module, light energy of light-emitting diodes (LEDs) forms a uniform surface light source after passing through a light guide plate / diffusion plate, optical films, and provides light energy for a liquid crystal panel. The final display brightness and color point of the liquid crystal screen are jointly affected by the liquid crystal panel, LED parameters, optical lens (direct type module), diffusion plate (direct type module), light guide plate (edge type module), and optical films. In the existing technical form, in order to meet the higher brightness demand and energy efficiency demand of the market, it is necessary to increase the number of LEDs, superimpose optical films, and other ways to achieve, which greatly increases the cost and has reliability risks. In the current market environment, a backlight technology with better cost performance is needed. SUMMARY

[0003] Therefore, the purpose of the present application is to provide a backlight module, which aims to improve the light-emitting efficiency of LEDs without changing the number of LEDs and the architecture of optical film pieces, and to realize the overall brightness improvement of the backlight module and the display device.

[0004] Another purpose of the present application is to provide a display device based on the backlight module described in the present application.

[0005] In order to achieve the above purpose, as a first aspect of the present application, a backlight module is provided, which comprises a light-emitting diode and an optical component; the optical component is provided with a blue dye; the light-emitting diode comprises a blue light wafer, a bracket with a storage cavity, and a fluorescent powder glue filling, the blue light wafer is located in the storage cavity and is arranged at the bottom of the storage cavity, and the fluorescent powder glue filling covers the blue light wafer; the fluorescent powder glue filling comprises yellow fluorescent powder and green fluorescent powder.

[0006] Optionally, the blue dye is doped in the optical component and / or coated on the light-emitting surface of the optical component. Further optionally, the blue dye accounts for 1-5% of the mass of the optical component.

[0007] Optionally, the blue dye comprises one or more of cobalt blue, cobalt-chromium blue, ultramarine, and phthalocyanine blue.

[0008] Optionally, the blue light wafer comprises a gallium nitride blue light wafer.

[0009] Optionally, the fluorescent powder glue filling comprises silica gel, yellow fluorescent powder and green fluorescent powder, and the mass ratio of the silica gel to the total mass of the fluorescent powder is 10:1-20:1. Further optionally, the mass ratio of the yellow fluorescent powder to the green fluorescent powder is 3:1-20:1; the yellow fluorescent powder comprises yttrium aluminum garnet, and the green fluorescent powder comprises nitride green fluorescent powder.

[0010] Optionally, the backlight module is a side-in backlight module, the optical component comprises a light guide plate, and the light emitting diode is arranged at one end of the light guide plate.

[0011] Optionally, the backlight module is a direct type backlight module, the optical component comprises a lens, and the lens is arranged on the light emitting side of the light emitting diode. Further optionally, the optical component further comprises one or more of a diffusion film, a diffusion plate and a reflective sheet.

[0012] As a second aspect of the present application, a display device is provided, comprising a display panel and the backlight module as described in the present application.

[0013] In the technical solution of the present application, a certain proportion of blue dye is arranged in the optical component of the backlight module, the proportion of blue light in the backlight module is increased, and the color point of the backlight module is actively caused to have a blue shift phenomenon; meanwhile, green fluorescent powder is doped in the yellow fluorescent powder of the conventional LED, the proportion of green light in the backlight module is increased, and thus the color point is corrected and the above-mentioned blue shift is offset; the addition of the green fluorescent powder in the LED can improve the light emitting efficiency of the LED, and the overall brightness of the backlight module is improved; according to the above principle, the scheme can be matched according to the requirement, the effect of brightness improvement of the backlight module is achieved, and an extreme cost design scheme is realized. BRIEF DESCRIPTION OF DRAWINGS

[0014] The drawings accompanying the specification of the present application form a part of the present application, which serve to provide a further understanding of the present application, the illustrative embodiments of the present application and the description thereof serve to explain the present application, and do not constitute an improper limitation on the present application;

[0015] Figure 1 A structure schematic diagram of a conventional LED (A) and an LED (B) of the present application is shown;

[0016] Figure 2 A light spectrum diagram of a conventional backlight module and a backlight module of the present application provided with blue dye is shown;

[0017] Figure 3 A CIE1931 color coordinate system diagram is shown; A is a CIE1931 color coordinate system diagram of a backlight module provided with blue dye in an optical component; B is a CIE1931 color coordinate system diagram of a backlight module provided with blue dye in an optical component and doped with green fluorescent powder in yellow fluorescent powder of an LED;

[0018] Figure 4 The light spectrum diagram of the conventional backlight module and the backlight module of the application adjusting the ratio of yellow phosphor and green phosphor in the LED is shown.

[0019] Figure 5 The structural schematic diagram of the edge-lit backlight module / display device of the application is shown.

[0020] Figure 6 The structural schematic diagram of the direct-lit backlight module / display device of the application is shown.

[0021] Explanation of reference numerals:

[0022] Table 1

[0023]

[0024] DETAILED DESCRIPTION

[0025] The application discloses a backlight module and display device, and those skilled in the art can refer to the content herein and appropriately improve process parameters to realize. It should be particularly pointed out that all similar replacements and changes are obvious to those skilled in the art, and they are all regarded as included in the application. The products described in the application have been described through preferred embodiments, and relevant personnel can obviously make changes or appropriate changes and combinations to the products described herein without departing from the content, spirit and scope of the application, to realize and apply the technology of the application. Obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the application.

[0026] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the present text are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0027] In the present text, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0028] In addition, the technical solutions in the various embodiments of the present application can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize the combination, and when the combination of the technical solutions contradicts each other or cannot be realized, it should be considered that the combination of the technical solutions does not exist and is not within the protection scope of the present application. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0029] In this document, relational terms such as "first" and "second," "step 1" and "step 2," and the like, are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element. The embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0030] The present application provides a backlight module and a display device.

[0031] The conventional high color gamut backlight module is generally divided into a side-in backlight module and a direct backlight module. In the side-in backlight module, the LED light bar is arranged at the side of the module, the LED point light is converted into a surface light source through a light guide plate, and then the light gain and diffusion effect of the optical film such as the brightness enhancement film and the diffusion film are used to provide a uniform surface light source for the liquid crystal panel. In the direct backlight module, the LED light bar is arranged at the bottom area of the module, the LED light with strong collimation is expanded to a divergence angle of about 150° through an optical lens, and then the light gain and diffusion effect of the optical film such as the diffusion plate are used to provide a uniform surface light source for the liquid crystal panel. No matter which kind of backlight module, in order to improve the brightness, the number of LEDs needs to be increased, optical films need to be stacked, and the cost is greatly increased and the reliability risk is increased.

[0032] Based on the technical problems of the conventional backlight module, in one aspect of the present application, a backlight module is provided, which comprises a light-emitting diode and an optical component; the optical component is provided with a blue dye. The light-emitting diode comprises a blue light wafer, a bracket with a storage cavity, and a fluorescent powder glue filling, the blue light wafer is located in the storage cavity and is arranged at the bottom of the storage cavity, and the fluorescent powder glue filling covers the blue light wafer; the fluorescent powder glue filling comprises yellow fluorescent powder and green fluorescent powder.

[0033] As an example, referring to Figure 1 , the blue light chip 301 in the light emitting diode 3 is located in the bracket 302 with a storage cavity and is arranged at the bottom of the storage cavity, and the fluorescent powder glue filling 303 covers the blue light chip 301; in some embodiments of the present application, the bracket 302 with the storage cavity is in the shape of a bowl cup, and the fluorescent powder glue filling 303 covers the blue light chip 301 and fills the entire storage cavity. In the light emitting diode 3 of the present application, the green fluorescent powder is doped in the fluorescent powder glue filling 303. On the one hand, the excitation efficiency of the green fluorescent powder is much higher than that of the yellow fluorescent powder in the traditional light emitting diode, so the doping of the green fluorescent powder in the light emitting diode of the present application can significantly improve the light intensity of the green band of the screen body, thereby improving the overall brightness. On the other hand, the blue dye is arranged in the optical component in the backlight module of the present application to cause the blue light proportion to be excessive. The traditional LED is yellow fluorescent powder, and it is difficult to achieve the white field standard color point, while the present application dopes a certain proportion of green fluorescent powder in the fluorescent powder glue filling 303, which can correct the color point of the screen body.

[0034] The optical component in the backlight module of the present application includes any component capable of controlling the transmission and processing of light, such as a light guide plate, a lens, a reflective sheet, a diffusion plate, an optical film, etc. The optical film includes but is not limited to a diffusion film, a brightness enhancement film, a diffusion-prism composite film DOP, a microlens-prism composite film MOP, a prism-prism composite film POP, a reflective polarized light type brightness enhancement composite film COP, etc.

[0035] The optical component of the present application can directly increase the proportion of blue light in the backlight module light spectrum by arranging blue dye, as shown in Figure 2 , the blue light peak at a wavelength of about 450 nm is improved; taking the CIE1931 color coordinate system as a reference object, the (x, y) color coordinates of the pure white field of the screen body will drift towards the blue region (0.14, 0.08), thereby deviating from the standard out-screen white field color point (0.28, 0.29), as shown in Figure 3 -A; and since the LED fluorescent powder glue filling 303 of the present application dopes a certain proportion of green fluorescent powder to correct the color point of the screen body, it can offset the (x, y) color coordinates of the display screen towards the green region (0.21, 0.71), as shown in Figure 3 -B, thereby achieving the standard out-screen white field color point (0.28, 0.29). It should be noted that in general, (0.28, 0.29) is the standard pure white field color point in the CIE1931 coordinate system, which is suitable for most display products, but according to different needs, there may be special pure white field color point requirements, such as (0.27, 0.28), (0.28, 0.31), etc. The present application takes the standard pure white field color point (0.28, 0.29) as an example to illustrate the technical principle.

[0036] When the backlight module of the present application works, the blue light chip 301 emits blue light, the fluorescent powder glue filling 303 including yellow fluorescent powder and green fluorescent powder is excited by the blue light to generate yellow light and green light, wherein the yellow light is the main light and the green light is the auxiliary correction light, and the corresponding backlight module spectrum diagram is shown in Figure 4 The system blue light and the generated yellow light and green light pass through the optical component provided with blue dye, which can correct the blue shift phenomenon caused by the blue dye, so as to be mixed into a standard pure white field color point.

[0037] The excitation efficiency of green fluorescent powder is much higher than that of yellow fluorescent powder, so the doping of green fluorescent powder in the LED can obviously improve the light intensity of the green band of the screen body, thereby improving the overall brightness. By using this principle, the proportion of green fluorescent powder in the LED can be moderately increased, and the proportion of blue pigment in the optical component can be simultaneously increased, so that the standard white field color point can be realized while the brightness of the screen body can be greatly improved.

[0038] In another aspect of the present application, the blue light chip 301 in the light-emitting diode 3 includes but is not limited to a gallium nitride blue light chip; the fluorescent powder glue filling 303 includes silica gel, yellow fluorescent powder and green fluorescent powder, in order to ensure reliability, the proportion of silica gel mass to total mass of fluorescent powder is 10:1-20:1, for example, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, etc.; in some embodiments of the present application, the yellow fluorescent powder includes but is not limited to YAG (yttrium aluminum garnet) and the like; the green fluorescent powder includes nitride green fluorescent powder, such as nitride β-sialon green fluorescent powder and the like. In some other embodiments of the present application, the mass ratio of yellow fluorescent powder to green fluorescent powder is not higher than 20:1, or 3:1≤mass ratio≤20:1, for example, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, etc.

[0039] In another aspect of the present application, the blue dye is doped in the optical component and / or coated on the light-emitting surface of the optical component, the blue dye is provided in the optical component farther away from the liquid crystal panel, the better the light mixing effect is, and the better the implementation effect is, for example, the light guide plate in the side-in backlight module and the lens, diffusion plate and the like in the direct under backlight module.

[0040] In some embodiments of the present application, the blue dye accounts for 1-5% of the mass of the optical component, such as 1%, 2%, 3%, 4%, 5%, etc. Less than 1% cannot achieve obvious color deviation effect, and more than 5% will cause color deviation excess, which cannot be corrected by adjusting the proportion of phosphor of the light emitting diode. In some other embodiments of the present application, the blue dye includes one or more of cobalt blue, cobalt-chromium blue, ultramarine, phthalocyanine blue (C 32 H 16 CuN8).

[0041] In some embodiments of the present application, coating the blue dye on the light emitting surface of the optical component can be achieved by uniformly coating the blue dye prepared as a liquid material on the light emitting surface, and doping the blue dye in the optical component can be achieved by mixing the blue dye with the raw material of the optical component, granulating, and then preparing the optical component.

[0042] In some other embodiments of the present application, the optical component with uniformly doped blue dye is obtained by referring to the following method:

[0043] The raw material for preparing the optical component and the blue dye are mixed and uniformly melted, and the temperature of the melting is between the melting point temperature of the raw material of the optical component and the melting point temperature of the blue dye, so that the blue dye can be uniformly distributed in the molten raw material of the optical component. Then, granulation is first completed, and after granulation, the raw material of the optical component is mixed to repeat the steps of feeding, melting, cooling molding, thickness monitoring, defect monitoring, etc., to obtain the optical component with the blue dye. The process of the present application of first granulation and then preparation of the optical component can ensure uniform distribution of the blue dye in the optical component, and avoid subjective defects and optical data deviation caused by uneven distribution such as clumping.

[0044] In some other embodiments of the present application, the present application is further illustrated by taking the light guide plate with the blue dye phthalocyanine blue arranged therein as an example:

[0045] To ensure the uniform distribution of phthalocyanine blue, the raw materials need to be granulated first: the polymethyl methacrylate (PMMA, light guide plate raw material) and the phthalocyanine blue raw material are mixed uniformly and then enter the screw interval at about 180°C to melt. In this process, the PMMA material melts, while the melting point of phthalocyanine blue itself is about 600°C and is not affected. Phthalocyanine blue will be uniformly distributed in the molten PMMA, and then extruded, cooled and cut into microns to millimeter level particles. By applying the above PMMA & phthalocyanine blue granules, mixing pure PMMA particles again, and repeating the steps of feeding, melting, cooling, forming, thickness monitoring, and defect monitoring, a blue dye light guide plate can be obtained. The preparation process of other optical components such as lenses, optical films, and diffusers is similar. For example, after the preparation of the lens, a layer of blue dye is uniformly coated on the light-emitting surface. When preparing optical films and diffusers, blue dye can be mixed with organic plastic granules, and then according to the needs, organic plastic is added or not added to perform the steps of feeding, melting, cooling, forming, thickness monitoring, and defect monitoring, so as to obtain the corresponding optical films and diffusers doped with blue dye.

[0046] Compared with the coating process, the above process of doping blue dye into the optical component has better cost performance and relatively simple process. In addition, since the optical components such as light guide plates and lenses are made of organic plastic materials such as polystyrene (PS), polymethyl methacrylate (PMMA), and styrene-methyl methacrylate copolymer (MS), phthalocyanine blue can be used as the preferred blue dye due to its better stability.

[0047] In some embodiments of the present application, taking a side-in backlight module as an example, the same backlight module test platform is used to test the optical data of the traditional backlight module, the light guide plate with different proportions of phthalocyanine blue pigment, and the LED with different proportions of β-sialon fluorescent powder in sequence, as shown in Table 2 below:

[0048] Table 2

[0049]

[0050]

[0051] The brightness of the backlight module usually needs to reach more than 320 nits. As can be clearly seen from the results in Table 2, the excitation efficiency of β-sialon green fluorescent powder is much higher than that of YAG yellow fluorescent powder. Therefore, compared with the traditional backlight module of scheme 1, the doping of green fluorescent powder in the LED of schemes 3, 5 and 7 can significantly improve the light intensity of the green band of the screen body, thereby improving the overall brightness, and the standard field color point is also corrected. Under the premise that the overall quality of the fluorescent glue and the mass ratio of the silicone and the fluorescent powder remain unchanged, the brightness can be improved by about 5% for every additional 1% of green fluorescent powder.

[0052] In the scheme 2, the scheme 4 and the scheme 6, only the blue dye is doped in the light guide plate, and the proportion of the fluorescent powder in the LED is not adjusted, so that the overall brightness is decreased, and the standard deviation color point is deviated.

[0053] In another aspect of the present application, the backlight module is a side-in backlight module, and the optical component includes a light guide plate, and the light emitting diode is arranged at one end of the light guide plate.

[0054] For example, referring to Figure 5 , the side-in backlight module includes:

[0055] A housing 1 forms a receiving cavity, and the receiving cavity is formed with a light outlet 101;

[0056] A circuit board 2 is arranged at one side of the receiving cavity;

[0057] A light emitting diode 3 is arranged on the circuit board 2 away from the receiving cavity; the structure of the light emitting diode 3 is shown in Figure 1 , which includes a blue wafer 301, a bracket 302 with a receiving cavity, and a fluorescent powder glue filling 303, the blue wafer 301 is located in the receiving cavity and arranged at the bottom of the receiving cavity, and the fluorescent powder glue filling 303 covers the blue wafer 301; the fluorescent powder glue filling 303 includes yellow fluorescent powder and green fluorescent powder;

[0058] A light guide plate 4 is doped with blue dye and arranged in the receiving cavity, the light inlet side of the light guide plate 4 corresponds to the arrangement of the light emitting diode 3, and the light outlet side of the light guide plate 4 corresponds to the arrangement of the light outlet 101;

[0059] A reflective sheet 5 is arranged on the side of the light guide plate 4 away from the light outlet 101 and abuts against the light guide plate 4;

[0060] An optical film 8 is arranged on the side of the light guide plate 4 close to the light outlet 101 and abuts against the light guide plate 4.

[0061] In some embodiments of the present application, the housing 1 includes a back plate 102 and a middle frame 103, the back plate 102 includes a side plate 1021 and a bottom plate 1022, the side plate 1021 is directly connected with the bottom plate 1022, the middle frame 103 is arranged in a spaced manner with the bottom plate 1022 and connected through the side plate 1021, the middle frame 103 is provided with the light outlet 101, and the circuit board 2 is installed on the side plate 1021.

[0062] In some embodiments of the present application, the reflective sheet 5 abuts against the bottom plate 1022, and the side edges of the optical film 8 are connected with the edge of the middle frame 103 close to the light outlet 101 through the adhesive 11 (such as a glue strip).

[0063] In some embodiments of the present application, a heat dissipation medium 10, such as a heat dissipation aluminum strip or the like, is partially or entirely arranged between the circuit board 2 and the back plate 102 and / or between the reflective sheet 5 and the back plate 102.

[0064] In the above-described side-in backlight module, the housing 1 forms a receiving cavity, the housing 1 is provided with a light outlet 101 corresponding to the receiving cavity and in communication with the receiving cavity, the light-emitting diode 3 is arranged on a side of the light guide plate 4, which is a left side or a right side of the light guide plate 4, the light guide plate 4 is arranged in the receiving cavity, and a side of the light guide plate 4 close to the light-emitting diode 3 is a light inlet side, and a side of the light guide plate 4 close to the light outlet 101 is a light outlet side;

[0065] During operation, the circuit board 2 provides power supply to the light-emitting diode 3, the light-emitting diode 3 emits a blue light source, and the green fluorescent powder (based on the yellow fluorescent powder) is added to the fluorescent powder glue filling 303 in the light-emitting diode 3, so that the generated light includes system blue light and green light and yellow light generated by excitation of the blue light, then the point light surface of the light-emitting diode 3 is converted into a surface light source through the light guide plate 4, the light guide plate 4 is doped with blue pigment, and various colors of light are mixed to achieve a standard white field color point, and the brightness of the screen body is also greatly improved, and then the brightness gain and diffusion effect of the reflective sheet 5 and the optical film 8 provide uniform surface light source for the liquid crystal panel 9. By using this principle, the overall brightness of the screen body can be improved without changing the LED light bar and optical film scheme and without increasing the cost, so that higher brightness indicators and energy efficiency indicators can be achieved, and the best cost-effective design scheme of the backlight module can be achieved.

[0066] In another aspect of the present application, the backlight module of the present application is a direct type backlight module, and the optical component includes a lens arranged on a light outlet side of the light-emitting diode. In addition, the optical component further includes one or more of a diffusion film, a diffusion plate, and a reflective sheet.

[0067] For example, referring to Figure 6 , the direct type backlight module includes:

[0068] a housing 1, the housing 1 surrounds to form a receiving cavity, and the receiving cavity is formed with a light outlet 101;

[0069] a circuit board 2, the circuit board 2 is arranged on a bottom of the receiving cavity;

[0070] a reflective sheet 5, the reflective sheet 5 is arranged on a side of the circuit board 2 away from the bottom of the receiving cavity and extends along a side wall of the receiving cavity to a side wall connection at the light outlet 101; the reflective sheet 5 arranged on the circuit board 2 is provided with a relief hole 501;

[0071] a light-emitting diode 3, the light-emitting diode 3 is arranged in the relief hole 501 and mounted on the circuit board 2; for the structure of the light-emitting diode 3, see Figure 1, including a blue light wafer 301, a bracket 302 with a storage cavity, and a fluorescent powder glue filling 303, the blue light wafer 301 is located in the storage cavity and is arranged at the bottom of the storage cavity, and the fluorescent powder glue filling 303 covers the blue light wafer 301; the fluorescent powder glue filling 303 includes yellow fluorescent powder and green fluorescent powder;

[0072] A lens 6, the lens 6 is doped with blue dye and covers the periphery of the light-emitting diode 3;

[0073] A diffusion plate 7, the diffusion plate 7 covers the light outlet 101 of the accommodating cavity, and the light-emitting diode 3 is arranged perpendicular to the diffusion plate 7.

[0074] An optical film 8, the optical film 8 is arranged on the side of the diffusion plate 7 away from the shell 1 and abuts.

[0075] In some embodiments of the present application, the edge of the shell 1 is bent towards the side of the diffusion plate 7 to form a bending portion 104.

[0076] In the above direct type backlight module, the shell 1 surrounds the accommodating cavity, the shell 1 is provided with a light outlet 101 corresponding to the position of the accommodating cavity and communicating with the accommodating cavity, the light-emitting diode 3 and the lens 6 form a backlight source arranged at the bottom of the accommodating cavity, specifically on the circuit board 2 in the avoiding hole 501, and the light-emitting diode 3 is arranged perpendicular to the diffusion plate 7 to achieve the best light output effect;

[0077] During operation, the circuit board 2 provides power to the light-emitting diode 3, the light-emitting diode 3 emits blue light source, the fluorescent powder glue filling 303 in the light-emitting diode 3 increases green fluorescent powder (based on yellow fluorescent powder), the generated light includes system blue light and green light and yellow light excited by blue light, then the LED light with strong collimation is expanded to about 150° divergence angle through the lens 6, the lens 6 is doped with blue dye, various colors of light are mixed to achieve standard white field color point, and the screen brightness is greatly improved, and then the brightness gain and diffusion effect of the reflecting sheet 5, the diffusion plate 7 and the optical film 8 provide uniform surface light source for the liquid crystal panel 9. According to the principle, the number of LEDs, the backlight module architecture remains unchanged, the brightness of the backlight module can be greatly improved, and no additional cost is needed, which is beneficial to realize the best cost-effective module scheme and is very beneficial to the design requirements of high brightness and high energy efficiency of the backlight module.

[0078] In another aspect of the present application, a display device is provided, including a liquid crystal panel 9 and any one of the backlight modules provided in the present application.

[0079] In some embodiments of the present application, the display device includes a display panel 9 and the aforementioned side-in backlight module, and the structural schematic diagram is shown in Figure 5On the basis of the aforementioned side-in backlight module, the liquid crystal panel 9 is covered at the light exit 101 and abuts against the shell 1. The abutting manner includes but is not limited to connection by the adhesive 11 (such as a glue strip).

[0080] In some other embodiments of the present application, the display device includes the display panel 9 and the aforementioned direct-down backlight module, and a structural schematic diagram is shown in Figure 6 On the basis of the aforementioned direct-down backlight module, the liquid crystal panel 9 is covered at the light exit 101 and abuts against the bent portion 104. The abutting manner includes but is not limited to connection by the adhesive 11 (such as a glue strip).

[0081] Based on the technical principle of the aforementioned solution of the present application, the optical component of the backlight module is provided with blue dye to cause blue shift. In order to correct the (x, y) color coordinates to the standard pure white field color point (such as x = 0.28, y = 0.29), by doping a certain proportion of green phosphor in the fluorescent powder glue filling 303 of the light-emitting diode 3, the display device (x, y) color coordinates is offset to the green region. Meanwhile, under the excitation of the same blue light wafer, the green phosphor has higher excitation efficiency than the yellow phosphor. With the increase of the proportion of green phosphor in the LED, the brightness level of the LED can be improved synchronously, thereby providing a high-brightness light source for the liquid crystal panel.

[0082] The above only describes specific embodiments of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A backlight module, characterized in that, The application relates to a backlight module, which comprises a light-emitting diode and an optical component; the optical component is provided with a blue dye; the light-emitting diode comprises a blue light wafer, a support with a placing cavity, and a fluorescent powder glue filling, the blue light wafer is located in the placing cavity and arranged at the bottom of the placing cavity, and the fluorescent powder glue filling covers the blue light wafer; the fluorescent powder glue filling comprises yellow fluorescent powder and green fluorescent powder.

2. The backlight module of claim 1, wherein, The blue dye is doped in the optical component and / or coated on the light-out surface of the optical component.

3. The backlight module of claim 2, wherein, The blue dye accounts for 1%-5% of the mass of the optical component.

4. The backlight module of claim 1, wherein, The blue dye comprises one or more of cobalt blue, cobalt-chromium blue, ultramarine, and phthalocyanine blue.

5. The backlight module of claim 1, wherein, The blue light wafer comprises a gallium nitride blue light wafer.

6. The backlight module according to any one of claims 1-5, wherein, The fluorescent powder glue filling comprises silica gel, yellow fluorescent powder and green fluorescent powder, the mass ratio of the silica gel to the total mass of the fluorescent powder is 10:1-20:1, and the mass ratio of the yellow fluorescent powder to the green fluorescent powder is 3:1-20:

1.

7. The backlight module of claim 6, wherein, The backlight module is a side-in backlight module, the optical component comprises a light guide plate, and the light-emitting diode is arranged at one end of the light guide plate.

8. The backlight module of claim 6, wherein, The backlight module is a direct type backlight module, the optical component comprises a lens, and the lens is arranged on the light-out side of the light-emitting diode.

9. The backlight module of claim 8, wherein, The optical component further comprises one or more of a diffusion film, a diffusion plate and a reflective sheet.

10. A display device, characterized by comprising: The application further relates to a liquid crystal display, which comprises a liquid crystal panel and the backlight module according to any one of claims 1-9.

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