Backlight module and display device

Abstract

The invention 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 the optical component of the backlight module, the blue light proportion in the backlight module is increased, and the 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 therefore the color point is corrected, and the blue shift is counteracted; the green fluorescent powder is added into the LED, so that the luminous efficiency of the LED can be improved, and the overall brightness of the backlight module is improved; by means of the principle, scheme matching can be carried out according to requirements, the effect of improving the brightness of the backlight module is achieved, and an extreme cost design scheme is achieved.

Description

Technical Field

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

[0002] In traditional backlight modules, light from light-emitting diodes (LEDs) forms a uniform surface light source after passing through a light guide plate / diffuser plate and an optical film, providing light energy for the liquid crystal panel. The final display brightness and color point of the LCD screen are jointly affected by the liquid crystal panel, LED parameters, optical lens (direct-down module), diffuser plate (direct-down module), light guide plate (side-entry module) and optical film. Under the existing technical form, in order to meet the market's higher brightness and energy efficiency requirements, it is necessary to increase the number of LEDs, superimpose optical films, etc., which greatly increases costs and poses reliability risks. In the current market environment, a more cost-effective backlight technology is needed. Summary of the invention

[0003] In view of this, the purpose of the present application is to provide a backlight module, aiming to improve the LED luminous efficiency without changing the number of LEDs and the optical film structure, so as to achieve an overall improvement in the brightness of the backlight module and the display device.

[0004] Another object 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-mentioned purpose, as the first aspect of the present application, a backlight module is provided, including a light-emitting diode and an optical component; the optical component is provided with a blue dye; the light-emitting diode includes a blue light chip, a bracket with a storage cavity and a fluorescent glue filler, the blue light chip is located in the storage cavity and is arranged at the bottom of the storage cavity, and the fluorescent glue filler covers the blue light chip; the fluorescent glue filler includes yellow fluorescent powder and green fluorescent powder.

[0006] Optionally, the blue dye is doped into 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 includes one or more of cobalt blue, cobalt chrome blue, ultramarine, and phthalocyanine blue.

[0008] Optionally, the blue light chip includes a gallium nitride blue light chip.

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

[0010] Optionally, the backlight module is an edge-entry backlight module, the optical component includes 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, and the optical component includes a lens, which is arranged on the light-emitting side of the light-emitting diode. Further optionally, the optical component also includes one or more of a diffusion film, a diffusion plate, and a reflection sheet.

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

[0013] In the technical solution of the present application, a certain proportion of blue dye is set in the optical components of the backlight module to increase the proportion of blue light in the backlight module, actively causing the color point of the backlight module to shift blue; at the same time, green phosphor is doped into the yellow phosphor of the conventional LED to increase the proportion of green light in the backlight module, thereby correcting the color point and offsetting the above-mentioned blue shift; the addition of green phosphor to the LED can improve the LED luminous efficiency and realize the overall brightness improvement of the backlight module; using the above principles, the solutions can be matched according to needs to achieve the effect of improving the brightness of the backlight module and realize the ultimate cost-effective design solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application.

[0015] Figure 1 Shown are schematic diagrams of the structures of a conventional LED (A) and the LED of the present application (B);

[0016] Figure 2 Shown are light spectrum diagrams of a conventional backlight module and a backlight module provided with a blue dye in the present application;

[0017] Figure 3 The diagram shows the CIE1931 color gamut coordinate system. A is a CIE1931 color gamut coordinate system of a backlight module in which a blue dye is set in an optical component. B is a CIE1931 color gamut coordinate system of a backlight module in which a blue dye is set in an optical component and a green phosphor is doped in the yellow phosphor of an LED.

[0018] Figure 4 The light spectrum diagrams of a conventional backlight module and a backlight module of the present application in which the ratio of yellow phosphor and green phosphor in LED is adjusted are shown;

[0019] Figure 5 Shown is a schematic structural diagram of the edge-type backlight module / display device of the present application;

[0020] Figure 6 Shown is a schematic structural diagram of the direct-type backlight module / display device of the present application.

[0021] Description of Figure Numbers:

[0022] Table 1

[0023]

[0024] DETAILED DESCRIPTION

[0025] The present application discloses a backlight module and a display device. Those skilled in the art can refer to the content of this article and appropriately improve the process parameters to achieve it. It is particularly important to point out that all similar replacements and modifications are obvious to those skilled in the art, and they are all deemed to be included in this application. The products described in this application have been described through preferred embodiments, and relevant personnel can obviously modify or appropriately change and combine the products described in this article without departing from the content, spirit and scope of this application to implement and apply the technology of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0026] It should be noted that all directional indications in this article (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] In this document, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] In addition, the technical solutions between the various embodiments of the present application can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application. It should be understood that the specific embodiments described here are only used to explain this application and are not used to limit this application.

[0029] In this article, if relational terms such as "first" and "second", "step 1" and "step 2", and "(1)" and "(2)" appear, they are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment 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 equipment. In the absence of further restrictions, the elements defined by the statement "comprise a..." do not exclude the presence of other identical elements in the process, method, article or equipment including the elements. At the same time, the embodiments in this application and the features in the embodiments may be combined with each other without conflict.

[0030] The following is a further description of a backlight module and a display device provided in the present application.

[0031] Traditional high color gamut backlight modules are generally divided into side-entry backlight modules and direct-type backlight modules. In side-entry backlight modules, LED light strips are placed on the side of the module, and the LED point light surface is converted into a surface light source through the light guide plate, and then the brightness gain and diffusion effect of optical films such as light enhancement film and diffusion film are used to provide a uniform surface light source for the LCD panel; in direct-type backlight modules, LED light strips are placed in the bottom area of ​​the module, and the LED light energy with strong collimation is expanded to a divergence angle of about 150° through the optical lens, and then the brightness gain and diffusion effect of the diffusion plate and optical film are used to provide a uniform surface light source for the LCD panel; no matter which type of backlight module is used, in order to increase the brightness, it is necessary to increase the number of LEDs, superimpose optical films, etc., which greatly increases the cost and increases the reliability risk.

[0032] Based on the technical problems of the above-mentioned traditional backlight module, in one aspect of the present application, a backlight module is provided, comprising 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 chip, a bracket having a storage cavity, and a phosphor glue filler, the blue light chip is located in the storage cavity and is arranged at the bottom of the storage cavity, and the phosphor glue filler covers the blue light chip; the phosphor glue filler comprises yellow phosphor and green phosphor.

[0033] As an example see 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 phosphor glue filler 303 covers the blue light chip 301; in some embodiments of the present application, the bracket 302 with a storage cavity is in the shape of a bowl, and the phosphor glue filler 303 covers the blue light chip 301 and fills the entire storage cavity. In the light emitting diode 3 of the present application, the phosphor glue filler 303 is doped with green phosphor. On the one hand, the excitation efficiency of green phosphor is much higher than that of yellow phosphor in traditional light emitting diodes. Therefore, the doping of green phosphor in the light emitting diode of the present application can significantly increase the light intensity of the green band of the screen, thereby improving the overall brightness. On the other hand, the present application sets a blue dye in the optical component of the backlight module, resulting in an excessive proportion of blue light. Traditional LEDs are all yellow phosphors, which are difficult to achieve the standard color point of the white field. However, a certain proportion of green phosphor is doped in the phosphor glue filler 303 of the present application, which can correct the color point of the screen.

[0034] The optical components in the backlight module of the present application include any components that can control the transmission and processing of light, such as light guide plates, lenses, reflective sheets, diffusers, optical films, etc., wherein the optical films include but are not limited to diffuser films, brightening films, diffuser-prism composite films DOP, microlens-prism composite films MOP, prism-prism composite films POP, reflective polarized brightening composite films COP, etc.

[0035] The optical component of the present application can directly increase the proportion of blue light in the light spectrum of the backlight module by setting a blue dye, such as Figure 2 As shown in the figure, the blue light peak at a wavelength of about 450nm has an improvement; taking the CIE1931 color coordinate system as a reference, the (x, y) color coordinates of the pure white field of the screen will drift toward the blue area (0.14, 0.08), thereby deviating from the standard white field color point of (0.28, 0.29). Figure 3 -A; and since a certain proportion of green phosphor is doped in the LED phosphor glue filler 303 of the present application to correct the color point of the screen, it can shift the color coordinates of the display screen (x, y) to the green area (0.21, 0.71), as shown in FIG. Figure 3 -B, thereby achieving the standard screen white field color point of (0.28, 0.29). It should be noted that, in general, in the CIE1931 coordinate system, (0.28, 0.29) is the standard pure white field color point, which is suitable for most display products. However, according to different needs, there will be special pure white field color point requirements, such as (0.27, 0.28), (0.28, 0.31), etc. This application takes the standard pure white field color point of (0.28, 0.29) as an example to illustrate the technical principle.

[0036] When the backlight module of the present application is working, the blue light chip 301 emits blue light, and the phosphor glue filler 303 including yellow phosphor and green phosphor 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. The corresponding backlight module spectrum schematic diagram is as follows: Figure 4 As shown in the figure, the green light peak at about 530nm is obviously improved. When the system blue light and the generated yellow light and green light pass through the optical components with blue dye, the blue shift caused by the blue dye can be corrected, so as to be mixed into the standard pure white field color point.

[0037] The excitation efficiency of green phosphor is much higher than that of yellow phosphor. Therefore, the doping of green phosphor in LED can significantly increase the light intensity of the green band of the screen, thereby improving the overall brightness. Using this principle, the proportion of green phosphor in LED can be appropriately increased, and the proportion of blue pigment in optical components can be increased simultaneously. While achieving the standard white field color point, the brightness of the screen can also 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 phosphor glue filler 303 includes silica gel, yellow phosphor and green phosphor. To ensure reliability, the ratio of the mass of silica gel to the total mass of phosphor 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 certain embodiments of the present application, the yellow phosphor includes but is not limited to YAG (yttrium aluminum garnet) and the like; the green phosphor includes nitride green phosphor, for example, nitride β-sialon green phosphor and the like. In some other embodiments of the present application, the mass ratio of yellow phosphor to green phosphor is not higher than 20:1, or is 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, blue dye is doped into optical components and / or coated on the light-emitting surface of the optical components. The farther the blue dye is set in the optical components from the liquid crystal panel, the better the light mixing effect and the better the implementation effect, such as the light guide plate in the edge-type backlight module and the lens and diffuser plate in the direct-type 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% can not achieve obvious color deviation effect, and more than 5% will lead to excessive color deviation, which cannot be corrected by adjusting the phosphor ratio of the light-emitting diode. In other embodiments of the present application, the blue dye includes cobalt blue, cobalt chrome blue, ultramarine, phthalocyanine blue (C 32 H 16 CuN 8 )

[0041] In certain embodiments of the present application, coating the blue dye on the light-emitting surface of the optical component can be achieved by preparing the blue dye into a liquid material and evenly coating it on the light-emitting surface, and doping the blue dye into the interior of the optical component can be achieved by mixing the blue dye with the optical component raw material and granulating it before preparing the optical component.

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

[0043] The raw materials for preparing optical components and blue dye are mixed and melted uniformly, and the melting temperature is between the melting point temperature of the raw materials for optical components and the melting point temperature of the blue dye, so that the blue dye can be evenly distributed in the molten raw materials for optical components, and then granulation is first completed, and after granulation, the raw materials for optical components are mixed and repeated feeding, melting, cooling and forming, thickness monitoring, defect monitoring and other links are performed to obtain optical components provided with blue dye. The process of granulating first and then preparing optical components in the present application can ensure that the blue dye is evenly distributed in the optical components, and avoid subjective defects and optical data deviations caused by uneven distribution phenomena such as agglomeration.

[0044] In some other embodiments of the present application, the present application further illustrates the case where a blue dye phthalocyanine blue is provided in a light guide plate as an example:

[0045] In order to ensure the uniform distribution of phthalocyanine blue, it is necessary to complete the raw material granulation first: polymethyl methacrylate (PMMA, light guide plate raw material) and phthalocyanine blue raw material are evenly mixed and then melted at about 180°C in the screw zone. During 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 evenly distributed in the molten PMMA, and then extruded, cooled and cut into micron to millimeter particles. Apply the above PMMA & phthalocyanine blue original particles, and then mix pure PMMA particles to repeat the feeding, melting, cooling molding, thickness monitoring, defect monitoring and other links to obtain a blue dye light guide plate. 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 evenly coated on its light-emitting surface; when preparing optical films and diffusers, blue dyes can be mixed with organic plastics. Finally, according to the needs, organic plastics are added or not added for feeding, melting, cooling molding, thickness monitoring, defect monitoring and other links to obtain the corresponding optical films and diffusers doped with blue dyes.

[0046] In comparison, the cost-effectiveness of the above-mentioned process of doping blue dye into the interior of optical components is better than the coating process, and the process is relatively simple. In addition, since 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 certain embodiments of the present application, taking the edge-entry 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 phosphor, as shown in Table 2 below:

[0048] Table 2

[0049]

[0050]

[0051] The brightness of the backlight module usually needs to reach more than 320nits. It can be clearly seen from the results in Table 2 that the excitation efficiency of β-sialon green phosphor is much higher than that of YAG yellow phosphor. Therefore, compared with the traditional backlight module of Scheme 1, the doping of green phosphor in LED in Scheme 3, Scheme 5 and Scheme 7 can significantly increase the light intensity of the green band of the screen, 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 remains unchanged and the mass ratio of silica gel and phosphor remains unchanged, every additional 1% of green phosphor doped can increase the brightness by about 5%;

[0052] In Scheme 2, Scheme 4 and Scheme 6, only blue dye is doped into the light guide plate, and the proportion of the phosphor in the LED is not adjusted, so the overall brightness is reduced and the standard deviation color point is also deviated.

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

[0054] As an example see Figure 5 , the edge-type backlight module includes:

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

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

[0057] The light emitting diode 3 is arranged on the side of the circuit board 2 away from the accommodating cavity; the structural diagram of the light emitting diode 3 is shown in FIG. Figure 1 , including a blue light chip 301, a bracket 302 with a storage cavity, and a phosphor glue filler 303, the blue light chip 301 is located in the storage cavity and is arranged at the bottom of the storage cavity, and the phosphor glue filler 303 covers the blue light chip 301; the phosphor glue filler 303 includes yellow phosphor and green phosphor;

[0058] A light guide plate 4, wherein the light guide plate 4 is doped with a blue dye and is disposed in the accommodating cavity, wherein the light incident side of the light guide plate 4 is disposed corresponding to the light emitting diode 3, and the light exit side of the light guide plate 4 is disposed corresponding to the light exit port 101;

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

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

[0061] In certain embodiments of the present application, the shell 1 includes a back panel 102 and a middle frame 103, the back panel 102 includes a side panel 1021 and a bottom panel 1022, the side panel 1021 is directly connected to the bottom panel 1022, the middle frame 103 and the bottom panel 1022 are spaced apart and connected through the side panel 1021, a light outlet 101 is opened on the middle frame 103, and the circuit board 2 is installed on the side panel 1021.

[0062] In some embodiments of the present application, the reflective sheet 5 is in contact with the bottom plate 1022 , and the side of the optical film 8 is connected to the edge of the middle frame 103 near the light outlet 101 via an adhesive 11 (eg, a glue strip).

[0063] In certain embodiments of the present application, a heat dissipation medium 10 , such as a heat dissipation aluminum strip, is partially or completely disposed 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-mentioned edge-entry backlight module, the housing 1 forms a receiving cavity, and a light outlet 101 communicating with the receiving cavity is provided at a position corresponding to the receiving cavity on the housing 1. The light-emitting diode 3 is arranged on a side of the light guide plate 4, and the side is the left side or the right side of the light guide plate 4. The light guide plate 4 is arranged in the receiving cavity, and the side of the light guide plate 4 close to the light-emitting diode 3 is the light-entry side, and the side of the light guide plate 4 close to the light outlet 101 is the light-exit side.

[0065] During operation, the circuit board 2 provides power to the light-emitting diode 3, and the light-emitting diode 3 emits a blue light source. Green phosphor (based on yellow phosphor) is added to the phosphor glue filler 303 in the light-emitting diode 3. The light generated thereby includes system blue light and green and yellow light generated by the blue light excitation. 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. After mixing, the light of various colors is realized to achieve a standard white field color point, and the brightness of the screen is also greatly improved. Then, through the brightness gain and diffusion effect of the reflector 5 and the optical film 8, a uniform surface light source is provided for the liquid crystal panel 9. By using this principle, the overall brightness of the screen can be improved while maintaining the LED light bar and optical film solutions unchanged and without increasing costs, thereby achieving higher brightness indicators and energy efficiency indicators, and realizing the best cost-effective design solution for the backlight module.

[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, which is arranged on the light-emitting side of the light-emitting diode. In addition, the optical component also includes one or more of a diffusion film, a diffusion plate, and a reflection sheet.

[0067] As an example see Figure 6 , the direct-type backlight module includes:

[0068] The housing 1 is surrounded by a receiving cavity, and the receiving cavity is formed with a light outlet 101;

[0069] A circuit board 2 is disposed on the bottom of the accommodating cavity;

[0070] The reflector 5 is disposed on a side of the circuit board 2 away from the bottom of the accommodating cavity and extends along the side wall of the accommodating cavity to connect to the side wall at the light outlet 101; the reflector 5 on the circuit board 2 is provided with an avoidance hole 501;

[0071] The light emitting diode 3 is arranged in the avoidance hole 501 and mounted on the circuit board 2; the structural diagram of the light emitting diode 3 is shown in FIG. Figure 1, including a blue light chip 301, a bracket 302 with a storage cavity, and a phosphor glue filler 303, the blue light chip 301 is located in the storage cavity and is arranged at the bottom of the storage cavity, and the phosphor glue filler 303 covers the blue light chip 301; the phosphor glue filler 303 includes yellow phosphor and green phosphor;

[0072] A lens 6, wherein the lens 6 is doped with a blue dye and is disposed around the periphery of the light emitting diode 3;

[0073] The diffusion plate 7 is covered at the light outlet 101 of the accommodating cavity, and the light emitting diode 3 is arranged perpendicular to the diffusion plate 7 .

[0074] The optical film 8 is disposed on a side of the diffuser 7 that is away from the housing 1 and abuts against the diffuser 7 .

[0075] In some embodiments of the present application, an edge of the housing 1 is bent toward one side of the diffusion plate 7 to form a bent portion 104 .

[0076] In the above-mentioned direct-type backlight module, the housing 1 is surrounded by a receiving cavity, and a light outlet 101 communicating with the receiving cavity is provided at a position corresponding to the receiving cavity on the housing 1. The backlight source composed of the light-emitting diode 3 and the lens 6 is arranged at the bottom of the receiving cavity, specifically, on the circuit board 2 in the avoidance hole 501. The light-emitting diode 3 is arranged perpendicular to the diffusion plate 7 to achieve the best light-emitting effect.

[0077] During operation, the circuit board 2 provides power to the light-emitting diode 3, and the light-emitting diode 3 emits a blue light source. Green phosphor (based on yellow phosphor) is added to the phosphor glue filler 303 in the light-emitting diode 3. The light generated thereby includes system blue light and green and yellow light generated by the blue light excitation. Then, the LED light energy with strong collimation is expanded to a divergence angle of about 150° through the lens 6. The lens 6 is doped with blue pigment. After mixing, the light of various colors realizes the standard white field color point, and also greatly improves the brightness of the screen. Then, through the brightness gain and diffusion effect of the reflector 5, the diffuser 7, and the optical film 8, a uniform surface light source is provided for the liquid crystal panel 9. Using this principle, the brightness of the backlight module can be greatly improved without increasing the cost, without the need for additional cost, which is conducive to realizing the module solution with the best cost performance ratio, and is very beneficial to the design requirements of high brightness and high energy efficiency indicators of the backlight module.

[0078] In another aspect of the present application, a display device is provided, comprising 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 edge-type backlight module, and the structural diagram is shown in FIG. Figure 5Based on the aforementioned edge-type backlight module, the liquid crystal panel 9 is covered at the light outlet 101 and abuts against the housing 1. The abutting method includes but is not limited to connecting with an adhesive 11 (such as a rubber strip).

[0080] In some other embodiments of the present application, the display device includes a display panel 9 and the aforementioned direct-type backlight module, and the structural diagram is shown in FIG. Figure 6 Based on the above-mentioned direct-type backlight module, the liquid crystal panel 9 is covered at the light outlet 101 and abuts against the bent portion 104. The abutting method includes but is not limited to connecting with an adhesive 11 (such as a rubber strip).

[0081] Based on the technical principles of the above-mentioned solution of the present application, it can be known that the present application sets a blue dye on the optical components of the backlight module to cause a blue shift. In order to correct the (x, y) color coordinates to the standard pure white field color point (for example, x=0.28, y=0.29), a certain proportion of green phosphor is doped in the phosphor glue filler 303 of the light-emitting diode 3 to shift the (x, y) color coordinates of the display device toward the green area; at the same time, under the excitation of the same blue light chip, the green phosphor has a higher excitation efficiency than the yellow phosphor. As the proportion of green phosphor in the LED increases, the brightness level of the LED can be increased synchronously, providing a high-brightness light source for the liquid crystal panel.

[0082] The above description is only a specific implementation 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 the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A backlight module, characterized in that: It 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 chip, a bracket with a storage cavity and a fluorescent powder glue filler, the blue light chip is located in the storage cavity and is arranged at the bottom of the storage cavity, and the fluorescent powder glue filler covers the blue light chip; the fluorescent powder glue filler comprises yellow fluorescent powder and green fluorescent powder.

2. The backlight module according to claim 1, characterized in that: The blue dye is doped into the optical component and / or coated on the light emitting surface of the optical component.

3. The backlight module according to claim 2, characterized in that: The blue dye accounts for 1% to 5% of the mass of the optical component.

4. The backlight module according to claim 1, characterized in that: The blue dye includes one or more of cobalt blue, cobalt chrome blue, ultramarine blue and phthalocyanine blue.

5. The backlight module according to claim 1, characterized in that: The blue light chip comprises a gallium nitride blue light chip.

6. The backlight module according to any one of claims 1 to 5, characterized in that: The phosphor glue filler comprises silica gel, yellow phosphor and green phosphor, the mass ratio of the silica gel to the total mass of the phosphor is 10:1-20:1, and the mass ratio of the yellow phosphor to the green phosphor is 3:1-20:

1.

7. The backlight module according to claim 6, characterized in that: The backlight module is an edge-entry 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 according to claim 6, characterized in that: The backlight module is a direct-type backlight module, and the optical component comprises a lens, which is arranged on the light-emitting side of the light-emitting diode.

9. The backlight module according to claim 8, characterized in that: The optical component also includes one or more of a diffusion film, a diffusion plate, and a reflection sheet.

10. A display device, characterized in that: It comprises a liquid crystal panel and the backlight module according to any one of claims 1 to 9.

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