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 red dye is arranged in the optical component of the backlight module, the red light proportion in the backlight module is increased, and the red shift phenomenon of color points of the backlight module is actively caused; meanwhile, the proportion of red fluorescent powder and green fluorescent powder in the high-color-gamut LED is adjusted, the proportion of green light is properly increased, and visual effect screen body color point correction is achieved; the proportion of green fluorescent powder in the high-color-gamut LED is increased, so that the luminous efficiency of the LED can be improved, the thermal reliability can be improved, the upper limit value of driving forward current can be increased, and the high-color-gamut LED has advancement compared with a traditional white-light high-color-gamut LED; 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] High color gamut display products are more vivid and lively, and closer to the real colors of nature, so they are more popular in the market. Traditional high color gamut display screens, whose color gamut value NSTC1931 is generally between 80% and 85%, achieve color gamut improvement by adding KSF red phosphor and β-sialon green phosphor to the light-emitting diode (LED), with a ratio of about 5:1 to 10:1. KSF red phosphor itself has low excitation efficiency, less excitation light and more heat dissipation, which can easily cause LED fluorescent glue to crack and fail. Therefore, the backlight module equipped with KSF high color gamut lamp beads can only use a lower current solution to ensure the reliability of the LED, but this will reduce the display brightness.

[0003] In order to improve the display brightness of the display device, it is often necessary to superimpose an optical gain film to improve the brightness, which is expensive and has a limited degree of brightness improvement. Therefore, a more cost-effective high color gamut module solution is needed to improve the market competitiveness of the product. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a backlight module, aiming to improve the color gamut of the display device, enhance the luminous efficiency and thermal reliability of the light emitting diode (LED), and enhance the upper limit of the driving forward current.

[0005] Another object of the present application is to provide a display device based on the backlight module described in the present application.

[0006] 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 red 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 red fluorescent powder and green fluorescent powder, and the mass ratio of the two is not higher than 5:1.

[0007] Optionally, the red dye is doped into the optical component and / or coated on the light-emitting surface of the optical component. Further optionally, the red dye accounts for 1%-5% of the mass of the optical component.

[0008] Optionally, the red dye includes one or more of carmine, red phthalocyanine, and red iron oxide.

[0009] Optionally, the red phosphor includes fluoride red phosphor, and the green phosphor includes nitride green phosphor.

[0010] Optionally, a bubble structure is provided in the optical component.

[0011] Further optionally, the phosphor glue filler includes silica gel, red phosphor and green phosphor, the ratio of the silica gel mass to the total phosphor mass is 1:1-5:1, and the mass ratio of the red phosphor to the green phosphor is 1:1 to 5:1.

[0012] 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.

[0013] 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 from the LED.

[0014] As a second aspect of the present application, a display device is provided, including a liquid crystal panel and the backlight module described in the present application.

[0015] In the technical solution of the present application, a certain proportion of red dye is set in the optical components of the backlight module to increase the proportion of red light in the backlight module, actively causing the color point of the backlight module to undergo a red shift; at the same time, the ratio of red phosphor to green phosphor in the high color gamut LED is adjusted, and the proportion of green light is appropriately increased to achieve visual screen color point correction; the increase in the proportion of green phosphor in the high color gamut LED can not only improve the LED luminous efficiency and thermal reliability, but also increase the upper limit of the driving forward current, which is more advanced than traditional white light high color gamut LEDs; 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 achieve an ultimate cost-effective design solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] Figure 1 Shown are schematic diagrams of the structures of a conventional LED (A) and the LED of the present application (B);

[0018] Figure 2 Shown are light spectrum diagrams of a conventional backlight module and a backlight module provided with a red dye in the present application;

[0019] Figure 3The diagram shows the CIE1931 color gamut coordinate system; A is a CIE1931 color gamut coordinate system of a backlight module in which a red dye is set in an optical component; B is a CIE1931 color gamut coordinate system of a backlight module in which a red dye is set in an optical component and the ratio of red phosphor to green phosphor in an LED is adjusted;

[0020] Figure 4 The light spectrum diagrams of a conventional backlight module and a backlight module in which the ratio of red phosphor and green phosphor in LED is adjusted according to the present application are shown;

[0021] Figure 5 The bubble structure is shown in the light guide plate of the edge-type backlight module. Figure 5 -A) and a bubble structure is set in the lens of the direct-type backlight module ( Figure 5 -B) structural diagram;

[0022] Figure 6 The following table shows the L50 value of LED lamp life at different red phosphor and green phosphor mass ratios;

[0023] Figure 7 The figure shows the excitation efficiency of LED lamps at different mass ratios of red phosphor and green phosphor;

[0024] Figure 8 Shown is a schematic structural diagram of the edge-type backlight module / display device of the present application;

[0025] Fig. 9 Shown is a schematic structural diagram of the direct-type backlight module / display device of the present application.

[0026] Description of Figure Numbers:

[0027] Table 1

[0028]

[0029] DETAILED DESCRIPTION

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] The following is a further description of a backlight module and a display device provided in the present application.

[0036] Traditional high color gamut backlight modules are generally divided into side-entry backlight modules and direct-type backlight modules. In side-entry backlight modules, high color gamut 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, high color gamut 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, in order to avoid the defect of excessive heat dissipation of KSF red phosphor in LED light strips, it is compensated by reducing the forward current of the drive, and the brightness is supplemented by increasing the number of LEDs, superimposing optical films, etc., but this solution greatly increases the cost and reliability risk.

[0037] Based on the technical problems of the above-mentioned traditional backlight module, in 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 red dye; the light-emitting diode (LED) includes a blue light chip, a bracket with 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 includes red phosphor and green phosphor, and the mass ratio of the two is not higher than 5:1.

[0038] As an example see Figure 1, the blue light chip 301 in the light emitting diode 3 is located in the bracket 32 ​​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 mass ratio of red phosphor to green phosphor in the phosphor glue filler 303 is not higher than 5:1. Compared with the mass ratio of red phosphor to green phosphor of 5:1 to 10:1 in traditional high color gamut LEDs, the present application increases the proportion of green phosphor in the LED and reduces the proportion of red phosphor. Since green phosphor has a higher excitation efficiency than red phosphor, the heat dissipation of LED lamp beads is reduced, which can not only improve the overall reliability of the LED, but also increase the driving current, thereby improving the brightness, streamlining the optical film configuration, and reducing the module cost. On the other hand, the present application sets a red dye in the optical components of the backlight module, resulting in an excessive proportion of red light. Traditional high-color gamut white light LEDs are mainly based on red phosphors, making it difficult to achieve the standard color point of the white field. However, the present application increases the proportion of green phosphors in the LEDs to produce more green light, which can correct the color point of the screen.

[0039] 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.

[0040] The optical component of the present application can directly increase the proportion of red light in the light spectrum of the backlight module by setting a red dye, such as Figure 2 As shown in the figure, the red light peak at a wavelength of about 610nm 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 red zone (0.67, 0.33), thereby deviating from the standard white field color point of (0.28, 0.29). Figure 3 -A; and since the present application adjusts the phosphor ratio of the high color gamut LED lamp beads, that is, reduces the proportion of red phosphor and increases the proportion of green phosphor, the color coordinates of the display screen (x, y) are shifted 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.

[0041] 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 red phosphor and green phosphor is excited by the blue light to generate red light and green light. Compared with the traditional high color gamut white light LED, the ratio of green phosphor in the LED of the present application is significantly improved, and the green light intensity in the light spectrum is also improved accordingly. 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 red light and green light pass through the optical component with red dye, the red shift caused by the setting of red dye can be corrected, so as to be mixed into the standard pure white field color point.

[0042] The excitation efficiency of green phosphor is much higher than that of red phosphor. Therefore, increasing the proportion 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 red 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.

[0043] 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, red phosphor and green phosphor. To ensure reliability, the ratio of the silica gel mass to the total phosphor mass is 1:1-5:1, such as 1:1, 2:1, 3:1, 4:1, 5:1, etc.; in some embodiments of the present application, the red phosphor includes a fluoride red phosphor, such as fluoride KSF (K2SiF 6+ ) red phosphor, etc.; green phosphor includes nitride green phosphor, such as nitride β-sialon green phosphor, etc. In some other embodiments of the present application, the mass ratio of red phosphor to green phosphor is 1:1≤mass ratio≤5:1, or 1:1≤mass ratio<5:1, and can further be 1:1-5:1, such as 1:1, 2:1, 3:1, 4:1, 4.9:1, 5:1, etc.

[0044] In another aspect of the present application, the red dye is uniformly doped into the optical component and / or uniformly coated on the light emitting surface of the optical component. The farther the red dye is set in the optical component 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.

[0045] In some embodiments of the present application, a bubble structure is provided in the optical component, for example, a micron-sized bubble structure is provided. The provision of the bubble structure will cause a large difference in refractive index between the optical component and the air, and the light energy will be frequently refracted, reflected, and totally reflected at the bubble interface, thereby increasing the optical path and improving the light mixing effect. In this process, the light energy of the backlight source frequently contacts the red dye of the optical component, which can greatly improve the red shift effect, and the light output of the optical component is also more uniform. The bubble structure in the optical component can be achieved by adding a foaming agent to the raw materials when preparing the optical component. The foaming agent can be an inorganic foaming agent (ammonium carbonate, sodium bicarbonate, etc.), an organic foaming agent (azo, nitroso), and the mass accounts for 3‰-8‰, and sodium bicarbonate is usually preferred as the foaming agent.

[0046] As an example see Figure 5 , in the light guide plate 4 of the edge-type backlight module ( Figure 5 -A) is provided with a plurality of micron-level bubble structures 401, and the optical film 8 and the reflective sheet 5 can be respectively provided on the upper and lower sides of the light guide plate 4; in the lens 6 of the direct-type backlight module ( Figure 5 -B) multiple micrometer-scale bubble structures 601 are provided, and the cover is provided on the periphery of the light-emitting diode 3, and the light-emitting diode 3 is provided on the circuit board 2. The refractive index of the material of the light guide plate and the lens is about 1.6, while the refractive index of air is about 1.0. Due to the large difference in refractive index, light energy will be frequently refracted, reflected and totally reflected at the bubble interface, thereby increasing the optical path and improving the light mixing effect.

[0047] In some embodiments of the present application, the red 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 a significant color shift effect, and more than 5% will lead to excessive color shift, which cannot be corrected by adjusting the phosphor ratio of the light-emitting diode. In some other embodiments of the present application, the red dye includes carmine, phthalocyanine red (tetrahydroquinoline diacridone C 20 H 12 N2O2), red iron oxide or one or more thereof.

[0048] In certain embodiments of the present application, coating the red dye on the light-emitting surface of the optical component can be achieved by preparing the red dye into a liquid material and evenly coating it on the light-emitting surface, and doping the red dye into the interior of the optical component can be achieved by mixing the red dye with the optical component raw material and granulating it before preparing the optical component.

[0049] In some other embodiments of the present application, an optical component uniformly doped with red dye is obtained by referring to the following method:

[0050] The raw material for preparing the optical component and the red dye are mixed and melted uniformly, and the melting temperature is between the melting point temperature of the optical component raw material and the melting point temperature of the red dye, so that the red dye can be evenly distributed in the molten optical component raw material, and then granulation is first completed, and the optical component raw material is mixed after granulation (if a bubble structure needs to be set, a foaming agent can be added at the same time) to repeat the steps of feeding, melting, cooling and forming, thickness monitoring, defect monitoring, etc., to obtain an optical component with a red dye set. The process of granulating first and then preparing the optical component in the present application can ensure that the red dye is evenly distributed in the optical component, avoiding subjective poor and optical data deviation caused by uneven distribution phenomena such as agglomeration.

[0051] In some other embodiments of the present application, the present application further explains by taking the red dye phthalocyanine red set in the light guide plate as an example:

[0052] In order to ensure the uniform distribution of phthalocyanine red, the raw material granulation needs to be completed first: polymethyl methacrylate (PMMA, light guide plate raw material) and phthalocyanine red raw material are evenly mixed and then melted in the screw zone at about 180℃-200℃. In this process, the PMMA material melts, while the melting point of phthalocyanine red itself is about 400℃ and is not affected. Phthalocyanine red will be evenly distributed in the molten PMMA, and then extruded, cooled and cut into micron to millimeter particles. Apply the above PMMA & phthalocyanine red 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 red 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 red dye is evenly coated on its light-emitting surface; when preparing optical films and diffusers, the red dye can be mixed with organic plastics. Finally, according to the needs, add or not add organic plastics to carry out feeding, melting, cooling molding, thickness monitoring, defect monitoring and other links to obtain the corresponding optical films and diffusers doped with red dyes.

[0053] In comparison, the cost-effectiveness of the above-mentioned process of doping red 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), styrene-methyl methacrylate copolymer (MS), and polycarbonate (PC), phthalocyanine red can be used as the preferred red dye due to its better stability.

[0054] In some embodiments of the present application, by setting different red phosphor and green phosphor mass ratios to test the light decay of LEDs at different ratios, the normal maximum current value If of a conventional high color gamut white light LED is MAX It is generally set at 650mA, while the normal maximum current value of the traditional ordinary color range white light LED If MAX It can be set at 850mA-1A. The reason for the difference is that the KSF red phosphor has a higher ratio, but the excitation efficiency is low and the heat dissipation is large. If it is driven by a large current, it is easy to cause abnormal heat dissipation and stress cracking of the fluorescent glue. The backlight module provided by this application fully optimizes the ratio of KSF red phosphor and β-sialon green phosphor. Appropriately reducing the ratio of KSF red phosphor can significantly improve the heat dissipation of LED lamp beads, thereby increasing the current driving value. Figure 5 As shown in the figure, the forward current value If=800mA is fixed, and the light decay test of high color gamut lamp beads with different ratios is carried out under the traditional experimental conditions of 85℃ / 85%RH. The time value when the brightness decays to 50% is recorded, which is defined as the LED life value, namely L50. The data is shown in Table 2 below. The industry standard for LED life is L50 / 30000H (Typ.), that is, the brightness decays to 50% of the initial value after 30000H.

[0055] Table 2

[0056] KSF: β-sialon If / mA Test temperature / ℃ Test humidity / RH% Light decay 50% time / H 10:1 800 85 85％ 19000 8:1 800 85 85％ 24600 5:1 800 85 85％ 31200 3:1 800 85 85％ 33500 1:1 800 85 85％ 39000

[0057] Combination Figure 6 It can be clearly seen from the results in Table 1 that as the proportion of red phosphor decreases, the LED light decay slows down and the reliability is improved simultaneously.

[0058] In some embodiments of the present application, different red phosphor and green phosphor mass ratios are set to test the excitation efficiency of LEDs at different ratios. Figure 7 ;according to Figure 7It can be clearly seen that when the KSF red phosphor and β-sialon green phosphor are mixed in different ratios, there is an obvious difference in the excitation light intensity under the same current. As the proportion of KSF red phosphor decreases and the proportion of β-sialon green phosphor increases, the excitation light intensity of the LED increases accordingly; at the same time, it can be seen that when the KSF red phosphor ratio has an absolute advantage (for example, 5:1-10:1), the LED reaches the peak of excitation efficiency at a current of 500-600mA. Continuing to increase the current does not significantly improve the brightness, and more electrical energy is converted into heat energy, affecting reliability; when the KSF red phosphor and β-sialon green phosphor are mixed in the same ratio, the LED still has an improved excitation efficiency at 800mA.

[0059] Therefore, appropriately reducing the proportion of KSF red phosphor in high color gamut LEDs will help improve the reliability and excitation efficiency of lamp beads. This technology applied to the backlight module can highlight a very obvious brightness improvement effect, thereby reducing the number of lamp beads used and the configuration of diaphragms, achieving efficiency improvements and cost reductions.

[0060] 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.

[0061] As an example see Figure 8 , the edge-type backlight module includes:

[0062] A housing 1, wherein the housing 1 forms a receiving cavity, and the receiving cavity forms a light outlet 101;

[0063] A circuit board 2, wherein the circuit board 2 is arranged at one side of the accommodating cavity;

[0064] 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 , comprising a blue light chip 301, a bracket 302 with a storage cavity, and a phosphor glue filler 303, wherein 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 comprises red phosphor and the green phosphor, and the mass ratio of the red phosphor to the green phosphor is not higher than 5:1;

[0065] A light guide plate 4, wherein the light guide plate 4 is doped with red 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;

[0066] 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;

[0067] 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 .

[0068] 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.

[0069] 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 through an adhesive 11 (such as a glue strip).

[0070] 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 .

[0071] 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.

[0072] 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. The fluorescent powder glue filler 303 in the light-emitting diode 3 increases the proportion of green fluorescent powder in the LED and reduces the proportion of red fluorescent powder. The light generated thereby includes system blue light and green and red 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 red 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 and the optical film 8, a uniform surface light source is provided for the liquid crystal panel 9. By using this principle, not only can the luminous efficiency of the LED be improved and the thermal reliability be improved, but also the upper limit of the driving forward current can be improved. Compared with the traditional white light high color gamut LED, it is advanced and can be matched according to the needs to achieve the effect of improving the brightness of the backlight module and realize the ultimate cost design solution.

[0073] 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.

[0074] As an example see Fig. 9 , the direct-type backlight module includes:

[0075] The housing 1 is surrounded by a receiving cavity, and the receiving cavity is formed with a light outlet 101;

[0076] A circuit board 2 is disposed on the bottom of the accommodating cavity;

[0077] 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;

[0078] 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 , comprising a blue light chip 301, a bracket 302 with a storage cavity, and a phosphor glue filler 303, wherein 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 comprises red phosphor and the green phosphor, and the mass ratio of the red phosphor to the green phosphor is not higher than 5:1;

[0079] A lens 6, wherein the lens 6 is doped with red dye and is disposed around the periphery of the light emitting diode 3;

[0080] 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 .

[0081] 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 .

[0082] 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 .

[0083] 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.

[0084] 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. The fluorescent powder glue filler 303 in the light-emitting diode 3 increases the proportion of green fluorescent powder in the LED and reduces the proportion of red fluorescent powder. The light generated thereby includes system blue light and green and red 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 red 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. By using this principle, under the premise that the number of LEDs and the backlight module architecture remain unchanged, the LED driving current is increased and the brightness of the backlight module is greatly improved, and no additional cost is required, which is conducive to realizing the module solution with the best cost performance, and is very beneficial to the design requirements of high brightness and high energy efficiency indicators of the backlight module.

[0085] 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.

[0086] 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 8 Based 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).

[0087] 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. Fig. 9 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).

[0088] Based on the technical principles of the above-mentioned scheme of the present application, it can be known that the present application sets a red dye on the optical components of the backlight module to cause it to be red-shifted, which can improve the color gamut of the display device. At the same time, 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), by adjusting the phosphor ratio of the high color gamut LED lamp beads, that is, the red phosphor ratio, and increasing the green phosphor ratio, the (x, y) color coordinates of the display device are shifted to 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 red phosphor. As the proportion of green phosphor in the LED increases, the brightness level of the LED can be improved synchronously, and the heat dissipation of the LED lamp beads is reduced, which can not only improve the overall reliability of the LED, but also increase the driving current, thereby improving the brightness, streamlining the optical film configuration, and reducing the module cost.

[0089] 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 red 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 red fluorescent powder and green fluorescent powder, and the mass ratio of the red fluorescent powder to the green fluorescent powder is not higher than 5:

1.

2. The backlight module according to claim 1, characterized in that: The red 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 red 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 red dye includes one or more of carmine, red phthalocyanine and red iron oxide.

5. The backlight module according to claim 1, characterized in that: The red phosphor includes fluoride red phosphor, and the green phosphor includes nitride green phosphor.

6. The backlight module according to claim 1, characterized in that: A bubble structure is arranged in the optical component.

7. The backlight module according to any one of claims 1 to 6, characterized in that: The phosphor glue filler includes silica gel, red phosphor and green phosphor, the mass ratio of the silica gel to the total mass of the phosphor is 1:1-5:1, and the mass ratio of the red phosphor to the green phosphor is 1:1 to 5:

1.

8. 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.

9. 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.

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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