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 red dye is arranged in an optical component of the backlight module, the proportion of red light in the backlight module is increased, and a red shift phenomenon of color points of the backlight module is actively caused; meanwhile, the proportion of green light is appropriately increased by adjusting the proportion of red phosphor and green phosphor in a high-color-domain LED, so that visual screen body color point correction is realized; the proportion of green phosphor in the high-color-domain LED is increased, which can not only improve LED light-emitting efficiency and heat reliability, but also improve the upper limit value of a driving forward current, and the high-color-domain LED is advanced compared with a traditional white light high-color-domain LED; according to the above principle, scheme matching can be performed according to requirements, the effect of backlight module brightness improvement is realized, and an extreme cost design scheme is realized.

Description

TECHNICAL FIELD

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

[0002] High color gamut display products have more vivid and lively pictures, and are closer to the real colors in nature, so they are more popular in the market. The color gamut value NSTC1931 of a traditional high color gamut display screen is generally between 80% and 85%, and the color gamut is improved by adding KSF red phosphor and beta-sialon green phosphor in a light-emitting diode (LED). The ratio of the two is about 5:1 to 10:1. However, the KSF red phosphor itself has low excitation efficiency, and the excitation light is less and the heat dissipation is more, which can easily cause the LED fluorescent glue to crack and thus fail. Therefore, the backlight module with KSF high color gamut lamp beads can only use a lower current scheme to ensure the reliability of the LED, but in this way the display brightness will be reduced.

[0003] In order to improve the display brightness of the display device, an optical gain film is often added to improve the brightness, which is expensive and has limited brightness improvement. Therefore, a high color gamut module scheme with better cost performance is needed to improve the market competitiveness of the product. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a backlight module, which aims to improve the color gamut of a display device, improve the light-emitting efficiency and thermal reliability of a light-emitting diode (LED), and improve the upper limit value of the driving forward current.

[0005] Another purpose 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 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 red 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 red phosphor and green phosphor, and the mass ratio of the two is not higher than 5:1.

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

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

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

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

[0011] Further optionally, the phosphor glue filling comprises silicone, red phosphor and green phosphor, the mass ratio of the silicone 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 1:1-5:1.

[0012] 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.

[0013] 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.

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

[0015] In the technical solution of the present application, a certain proportion of red dye is arranged in the optical component of the backlight module, the proportion of red light in the backlight module is increased, and the color point of the backlight module is actively caused to red shift. At the same time, the proportion of green light is appropriately increased by adjusting the proportion of red phosphor to green phosphor in the high color gamut LED, so as to realize the color point correction of the visual screen. The proportion of green phosphor in the high color gamut LED is increased, which can not only improve the light emitting efficiency and heat reliability of the LED, but also improve the upper limit value of the driving forward current, and has advancement compared with the traditional white light high color gamut LED. According to the above principle, the scheme can be matched according to the demand, the brightness of the backlight module is improved, and the extreme cost design scheme is realized. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings accompanying the specification of the present application form a part of the present application, which are used to provide further understanding of the present application, and the schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation to the present application;

[0017] Figure 1 The structure schematic diagrams of the conventional LED (A) and the LED (B) of the present application are shown;

[0018] Figure 2 The light frequency spectrum diagrams of the conventional backlight module and the backlight module provided with red dye of the present application are shown;

[0019] Figure 3CIE1931 color gamut coordinate system diagram; A is a backlight module CIE1931 color gamut coordinate system diagram with red dye set in the optical component; B is a backlight module CIE1931 color gamut coordinate system diagram with red dye set in the optical component and adjusting the ratio of red phosphor and green phosphor in the LED;

[0020] Figure 4 The light spectrum diagram of the conventional backlight module and the backlight module of the present application adjusting the ratio of red phosphor and green phosphor in the LED is shown;

[0021] Figure 5 The structure schematic diagram of setting bubble structure in the light guide plate of the side-in backlight module (A) and the lens of the direct type backlight module (B) is shown; Figure 5 Figure 5

[0022] Figure 6 The LED lamp life L50 value under different mass ratio of red phosphor and green phosphor is shown;

[0023] Figure 7 The LED lamp excitation efficiency under different mass ratio of red phosphor and green phosphor is shown;

[0024] Figure 8 The structure schematic diagram of the side-in backlight module / display device of the present application is shown;

[0025] Figure 9 The structure schematic diagram of the direct type backlight module / display device of the present application is shown.

[0026] BRIEF DESCRIPTION OF DRAWINGS

[0027] Table 1

[0028]

[0029] DETAILED DESCRIPTION

[0030] ​​The application discloses a backlight module and a display device. 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.

[0031] 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 and the like between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0032] 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 communication 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 present application can be understood according to the specific circumstances.

[0033] In addition, the technical solutions of various embodiments of the present application can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the protection scope required by the present application. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0034] In this document, relational terms such as "first" and "second," and "step 1" and "step 2," and the like, can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such 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 and features of the application described herein can be combined with each other as mutually consistent or equivalent features.

[0035] The backlight module and display device provided in the present application are further described below.

[0036] A conventional high color gamut backlight module is generally classified into a side-in backlight module and a direct backlight module. In the side-in backlight module, a high color gamut LED light bar is arranged at the side of the module, and the LED point light is converted into a surface light source by a light guide plate, and then the light is provided to a liquid crystal panel through the brightness gain and diffusion effect of optical films such as a brightness enhancement film and a diffusion film. In the direct backlight module, a high color gamut LED light bar is arranged at the bottom region of the module, and the LED light with strong collimation is expanded to a divergence angle of about 150° through an optical lens, and then the light is provided to a liquid crystal panel through the brightness gain and diffusion effect of optical films such as a diffusion plate and an optical film. In either backlight module, in order to avoid the defect of excessive heat dissipation of KSF red phosphor in the LED light bar, the driving forward current is reduced to compensate, and the number of LEDs is increased, and optical films are added to supplement the brightness, but such solutions greatly increase the cost and increase the reliability risk.

[0037] Based on the technical problems of the conventional backlight module, in 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 red dye; the light-emitting diode (LED) comprises a blue light chip, a bracket with a storage cavity, and a fluorescent powder glue filling, 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 filling covers the blue light chip; the fluorescent powder glue filling comprises red fluorescent powder and green fluorescent powder, and the mass ratio of the two is not higher than 5:1.

[0038] For 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 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 mass ratio of red fluorescent powder to green fluorescent powder in the fluorescent powder glue filling 303 is not higher than 5:1, compared with the mass ratio of 5:1-10:1 of red fluorescent powder to green fluorescent powder in the traditional high color gamut LED, the proportion of green fluorescent powder in the LED is increased and the proportion of red fluorescent powder is reduced, because the green fluorescent powder has higher excitation efficiency than the red fluorescent powder, the heat dissipation of the LED lamp bead is reduced, which not only improves the overall reliability of the LED, but also improves the driving current, thereby improving the brightness, simplifying the optical film configuration, and reducing the module cost. On the other hand, the red dye is arranged in the optical components in the backlight module to cause the red light ratio to be in excess, the traditional high color gamut white LED mainly uses red fluorescent powder, and it is difficult to achieve the white field standard color point, but the proportion of green fluorescent powder in the LED of the present application is increased to produce more green light, which can correct the color point of the screen body.

[0039] The optical components in the backlight module of the present application include 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., wherein 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.

[0040] The optical components of the present application can directly increase the proportion of red light in the light spectrum of the backlight module by arranging red dye, as shown in Figure 2 , the red light peak at a wavelength of about 610 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 red region (0.67, 0.33), thereby deviating from the standard out-screen white field color point (0.28, 0.29), as shown in Figure 3 -A; and because the fluorescent powder ratio of the high color gamut LED lamp bead is adjusted in the present application, i.e., the proportion of red fluorescent powder is reduced and the proportion of green fluorescent powder is increased, the (x, y) color coordinates of the display screen are offset towards the green region (0.21, 0.71), as shown in Figure 3-B as shown, thereby achieving a standard out-of-screen white field color point of (0.28, 0.29). It should be noted that in general, under the CIE1931 coordinate system, (0.28, 0.29) is a standard pure white field color point, which is suitable for most display products, but according to different requirements, 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 of (0.28, 0.29) as an example to illustrate the technical principle.

[0041] When the backlight module of the present application works, the blue light chip 301 emits blue light, and the fluorescent powder glue filling 303 including red and green fluorescent powders is excited by the blue light to generate red and green light. Compared with the traditional high color gamut white light LED, the proportion of green fluorescent powder in the LED of the present application is significantly improved, and the green light intensity in the corresponding backlight module spectrum is also improved, as shown in the schematic diagram of the backlight module spectrum Figure 4 , and the green light wave peak at about 530 nm is obviously improved. The system blue light and the generated red and green light pass through the optical component provided with red dye, which can correct the red shift phenomenon caused by the setting of red dye, so as to be mixed into a standard pure white field color point.

[0042] The excitation efficiency of green fluorescent powder is much higher than that of red fluorescent powder, so the increase of the proportion of green fluorescent powder in the LED can significantly 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 appropriately increased, and the proportion of red 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 is 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 fluorescent powder glue filling 303 includes silica gel, red fluorescent powder and green fluorescent powder. In order to ensure reliability, the proportion of silica gel quality to total fluorescent powder quality 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 fluorescent powder includes fluoride red fluorescent powder, such as fluoride KSF (K2SiF 6+ ) red fluorescent powder, etc.; the green fluorescent powder includes nitride green fluorescent powder, such as nitride β-sialon green fluorescent powder, etc. In some other embodiments of the present application, the mass ratio of red fluorescent powder to green fluorescent powder is 1:1≤mass ratio≤5:1, or 1:1≤mass ratio<5:1, and further optionally 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 in the optical component and / or uniformly coated on the light-out surface of the optical component. The farther the distance between the liquid crystal panel and the optical component, the better the light mixing effect and the better the implementation effect. For example, the light guide plate in the side-in backlight module and the lens, diffusion plate, etc. in the direct backlight module.

[0045] In some embodiments of the present application, a bubble structure is provided in the optical component, such as a micron-level bubble structure. The provision of the bubble structure causes a large refractive index difference between the optical component and the air, and the light energy is 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 frequently contacts the red dye of the optical component, which can greatly improve the red shift effect, and the light-out of the optical component is more uniform. The bubble structure in the optical component can be realized by adding a foaming agent to the raw material during the preparation of the optical component. The foaming agent can be an inorganic foaming agent (ammonium carbonate, sodium bicarbonate, etc.), an organic foaming agent (azo, nitroso), with a mass fraction of 3‰-8‰, and sodium bicarbonate is usually preferred as the foaming agent.

[0046] For example, see Figure 5 In the light guide plate 4 of the side-in backlight module, Figure 5 A) a plurality of micron-level bubble structures 401 are provided, and optical films 8 and reflective sheets 5 can be respectively provided on the upper and lower sides of the light guide plate 4; in the lens 6 of the direct backlight module, Figure 5 B) a plurality of micron-level bubble structures 601 are provided, which are arranged around the light-emitting diode 3, and the light-emitting diode 3 is arranged on the circuit board 2. The refractive index of the material of the light guide plate and the lens is about 1.6, and the refractive index of the air is about 1.0. Due to the large refractive index difference, the light energy is 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% cannot achieve obvious color deviation effect, and more than 5% will cause color deviation excess, which cannot be corrected by adjusting the fluorescent powder ratio of the light-emitting diode. In some other embodiments of the present application, the red dye includes one or more of carmine, phthalocyanine red (tetrahydroquinoline diazene ketone C 20 H 12 N2O2), and iron oxide red.

[0048] In some embodiments of the present application, coating the red dye on the light exit surface of the optical component can be achieved by uniformly coating the red dye in liquid form on the light exit surface, while doping the red dye inside the optical component can be achieved by mixing the red dye with the raw material of the optical component, granulating, and then preparing the optical component.

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

[0050] The raw material for preparing the optical component and the red dye are mixed and uniformly melted at a temperature between the melting point of the raw material of the optical component and the melting point of the red dye, so that the red dye is 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 (if a foaming agent is needed to set up a bubble structure, it can be added at the same time) is mixed again to repeat the steps of feeding, melting, cooling molding, thickness monitoring, and defect monitoring, to obtain the optical component with the red dye. The process of the present application of first granulation and then preparation of the optical component can ensure uniform distribution of the red dye in the optical component, avoiding subjective defects and optical data deviation caused by uneven distribution such as clumping.

[0051] In some other embodiments of the present application, the preparation of the light guide plate with the red dye phthalocyanine red inside is further described as an example:

[0052] To ensure uniform distribution of the phthalocyanine red, granulation of the raw material is first completed: the polymethyl methacrylate (PMMA, raw material of the light guide plate) and the phthalocyanine red raw material are uniformly mixed and then enter the screw interval at about 180-200°C to melt. During this process, the PMMA material melts, while the phthalocyanine red itself is not affected by the melting point of about 400°C. The phthalocyanine red is uniformly distributed in the molten PMMA, and then is extruded, cooled, and cut into micrometer to millimeter level particles. Using the above PMMA & phthalocyanine red raw particles, the pure PMMA particles are mixed again to repeat the steps of feeding, melting, cooling molding, thickness monitoring, and defect monitoring, to obtain the red dye light guide plate. The preparation process of lenses, optical films, and diffusion plates and other optical components is similar, for example, after the preparation of the lens, a layer of red dye is uniformly coated on the light exit surface; when preparing the optical film and the diffusion plate, the red dye can be mixed with the organic plastic granules, and finally, according to the need, organic plastic is added or not added to repeat the steps of feeding, melting, cooling molding, thickness monitoring, and defect monitoring, to obtain the corresponding optical film and diffusion plate with doped red dye.

[0053] Compared with the coating process, the cost performance of the process of doping red dye into the optical component is better, and the process is relatively simple. In addition, since the optical components such as light guide plates, lenses and the like are made of organic plastic materials such as polystyrene (PS), polymethyl methacrylate (PMMA), styrene-methyl methacrylate copolymer (MS), polycarbonate (PC) and the like, phthalocyanine red can be used as a preferred red dye due to its better stability.

[0054] In some embodiments of the present application, the light decay of the LED at different proportions is tested by setting different mass ratios of red and green phosphors, and the normal maximum current value If of the conventional high color gamut white light LED is 650mA MAX The normal maximum current value If of the conventional general color gamut white light LED is generally set to 650mA MAX However, it can be set to 850mA-1A, and the difference is due to the high proportion of KSF red phosphor, but the excitation efficiency is low, the heat dissipation is large, and if a large current is driven, it is easy to cause abnormal heat dissipation and stress cracking failure of the fluorescent glue; the proportion of KSF red phosphor and β-sialon green phosphor in the backlight module provided in the present application is fully optimized, and appropriately reducing the proportion of KSF red phosphor can significantly improve the heat dissipation of the LED lamp bead, so that the current driving value can be improved. As shown in Figure 5 , the light decay of high color gamut lamp beads with different proportions is tested under the traditional 85°C / 85%RH experimental condition by fixing If=800mA forward current value, and the time value when the brightness attenuation is 50% is recorded, which is defined as the LED life value, i.e. L50. The data is shown in Table 2 below. The industry standard for LED life is L50 / 30000H(Typ.), i.e. the brightness attenuation is 50% of the initial value after 30000H.

[0055] Table 2

[0056] KSF: β-sialon If / mA Test temperature / °C 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] In combination Figure 6 with the results in Table 1, it can be seen that as the proportion of red phosphor decreases, the light decay of the LED slows down, and the reliability is also improved simultaneously.

[0058] In some embodiments of the present application, the excitation efficiency of the LED at different proportions is tested by setting different mass ratios of red and green phosphors, and the results are shown in Figure 7 ; according to Figure 7It can be clearly seen that the excitation light intensity of the LED is obviously different under the same current when the KSF red phosphor and the β-sialon green phosphor are in different proportions. With the decrease of the proportion of the KSF red phosphor and the increase of the proportion of the β-sialon green phosphor, the excitation light intensity of the LED is improved. It can also be seen that when the proportion of the KSF red phosphor is dominant (for example, 5:1-10:1), the LED reaches the excitation efficiency peak at 500-600 mA current. If the current is further increased, the brightness is not obviously improved, and more electrical energy is converted into heat energy, which affects the reliability. When the proportion of the KSF red phosphor and the β-sialon green phosphor is equivalent, the excitation efficiency of the LED is still improved at 800 mA.

[0059] Therefore, appropriately reducing the proportion of the KSF red phosphor in the high color gamut LED is beneficial to improve the reliability and excitation efficiency of the lamp bead. The application of the technology to the backlight module can highlight the very obvious brightness improvement effect, thereby reducing the number of lamp beads and the configuration of the film, and realizing the efficiency improvement and cost reduction.

[0060] In another aspect of the present application, the backlight module of the present application is a side-in backlight module, and the optical component includes a light guide plate. The light emitting diode is arranged at one end of the light guide plate.

[0061] For example, see Figure 8 The side-in backlight module includes:

[0062] A housing 1 forms a containing cavity, and the containing cavity is formed with a light outlet 101;

[0063] A circuit board 2 is arranged on one side of the containing cavity;

[0064] A light emitting diode 3 is arranged on the side of the circuit board 2 away from the containing 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 containing cavity, and a fluorescent powder glue filling 303. The blue wafer 301 is located in the containing cavity and is arranged at the bottom of the containing cavity. The fluorescent powder glue filling 303 covers the blue wafer 301. The fluorescent powder glue filling 303 includes 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;

[0065] A light guide plate 4 is doped with red dye and arranged in the containing cavity. The light entrance side of the light guide plate 4 corresponds to the arrangement of the light emitting diode 3, and the light exit side of the light guide plate 4 corresponds to the arrangement of the light outlet 101;

[0066] 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;

[0067] 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.

[0068] In some embodiments of the present application, the housing 1 comprises a back plate 102 and a middle frame 103, the back plate 102 comprises a side plate 1021 and a bottom plate 1022, the side plate 1021 is directly connected to the bottom plate 1022, the middle frame 103 is arranged in a spaced-apart manner with the bottom plate 1022 and is connected through the side plate 1021, the middle frame 103 is provided with the light outlet 101, and the circuit board 2 is mounted on the side plate 1021.

[0069] 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 to the edges of the middle frame 103 close to the light outlet 101 through the adhesive 11 (such as a glue strip).

[0070] In some embodiments of the present application, the heat dissipation medium 10, such as a heat dissipation aluminum strip, is arranged 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 side-in backlight module, the housing 1 forms a receiving cavity, the housing 1 is provided with the light outlet 101 corresponding to the receiving cavity and in communication with the receiving cavity, the light emitting diode 3 is arranged on the side of the light guide plate 4, which 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 inlet side, and the side of the light guide plate 4 close to the light outlet 101 is the light outlet side.

[0072] In the working process, the circuit board 2 provides power supply to the light emitting diode 3, the light emitting diode 3 emits blue light source, the proportion of green fluorescent powder in the fluorescent powder glue filling 303 in the light emitting diode 3 is increased, and the proportion of red fluorescent powder is reduced, thus the generated light includes system blue light and green light and red light excited by 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 red 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 LED light emitting efficiency, heat reliability, driving forward current upper limit value can be improved, and compared with the traditional white light high color gamut LED, the backlight module has advancement, can be matched according to the demand, realizes the effect of backlight module brightness improvement, and realizes the extreme cost design scheme.

[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 comprises a lens arranged on the light outlet side of the light emitting diode light. In addition, the optical component further comprises one or more of a diffusion film, a diffusion plate, and a reflective sheet.

[0074] As an example, see Figure 9 , the direct backlight module comprises:

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

[0076] A circuit board 2, the circuit board 2 is arranged on the bottom of the receiving cavity;

[0077] A reflective sheet 5, the reflective sheet 5 is arranged on the circuit board 2 away from the bottom of the receiving cavity, and extends along the side wall of the receiving cavity to the side wall connection at the light outlet 101; the reflective sheet 5 on the circuit board 2 is provided with a relief hole 501;

[0078] A light emitting diode 3, the light emitting diode 3 is arranged in the relief hole 501 and mounted on the circuit board 2; the structure diagram of the light emitting diode 3 is shown in Figure 1 , comprising a blue wafer 301, a bracket 302 with a storage cavity and a fluorescent powder glue filling 303, the blue wafer 301 is located in the storage cavity and arranged on the bottom of the storage cavity, and the fluorescent powder glue filling 303 covers the blue wafer 301; the fluorescent powder glue filling 303 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;

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

[0080] A diffusion plate 7, the diffusion plate 7 covers the light outlet 101 of the receiving cavity, and the light emitting diode 3 is arranged perpendicular to the diffusion plate 7.

[0081] An optical film 8, the optical film 8 is arranged on the side of the diffusion plate 7 away from the housing 1 and abuts.

[0082] In some embodiments of the present application, the edge of the housing 1 is bent to form a bending part 104 towards the side of the diffusion plate 7.

[0083] In the above direct backlight module, the housing 1 is surrounded by a receiving cavity, the housing 1 is provided with a light outlet 101 corresponding to the position of the receiving cavity and communicating with the receiving cavity, the light emitting diode 3 and the lens 6 form a backlight source arranged on the bottom of the receiving cavity, specifically on the circuit board 2 in the relief hole 501, and the light emitting diode 3 is arranged perpendicular to the diffusion plate 7 to achieve the best light output effect;

[0084] In the working process, the circuit board 2 provides power supply for the light emitting diode 3, the light emitting diode 3 emits blue light source, the proportion of green fluorescent powder in the light emitting diode 3 is increased and the proportion of red fluorescent powder is reduced in the fluorescent powder glue filling 303, the light generated thereby includes system blue light and green light and red light excited by the blue light, then the LED light energy with strong collimation is expanded to about 150° divergence angle through the lens 6, the lens 6 is doped with red pigment, various colors of light are mixed to realize standard white field color point, meanwhile, the screen brightness is greatly improved, then the brightness gain and diffusion effect of the reflecting sheet 5, the diffusion plate 7 and the optical film 8 are used to provide uniform surface light source for the liquid crystal panel 9. According to the principle, the LED driving current is improved, the backlight module brightness is greatly improved under the premise of unchanged LED quantity and backlight module architecture, the cost is not additionally increased, the best cost-effective module scheme is realized, and the design requirement of high brightness and high energy efficiency of the backlight module is very beneficial.

[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 comprises a display panel 9 and the aforementioned side-in backlight module, and the structural schematic diagram is shown in Figure 8 On the basis of the aforementioned side-in backlight module, the liquid crystal panel 9 is arranged at the light outlet 101 and abuts against the shell 1. The abutting mode includes but is not limited to connection by using the adhesive 11 (such as adhesive tape).

[0087] In some embodiments of the present application, the display device comprises a display panel 9 and the aforementioned direct type backlight module, and the structural schematic diagram is shown in Figure 9 On the basis of the aforementioned direct type backlight module, the liquid crystal panel 9 is arranged at the light outlet 101 and abuts against the bending part 104. The abutting mode includes but is not limited to connection by using the adhesive 11 (such as adhesive tape).

[0088] Based on the technical principle of the above-mentioned scheme of the present application, the optical component of the backlight module is provided with red dye, so that red shift occurs, which can improve the color gamut of the display device. 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), the proportion of red fluorescent powder is adjusted, and the proportion of green fluorescent powder is increased, so that the (x, y) color coordinates of the display device are offset to the green region. At the same time, under the excitation of the same blue light wafer, the green fluorescent powder has higher excitation efficiency than the red fluorescent powder. With the increase of the proportion of green fluorescent powder in the LED, the brightness level of the LED can be improved synchronously, and the heat dissipation of the LED lamp bead is reduced. Not only the overall reliability of the LED can be improved, but also the driving current can be improved, so as to improve the brightness, simplify the optical film configuration, and reduce the cost of the module.

[0089] The above description is merely a specific implementation of the present application, which enables those skilled in the art to 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 disclosed herein.

Claims

1. A backlight module, characterized in that, The backlight module 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 wafer, a bracket with a placing cavity, and a fluorescent powder glue filling, the blue light wafer is located in the placing cavity and is arranged at the bottom of the placing cavity, the fluorescent powder glue filling covers the blue light wafer; the fluorescent powder glue filling comprises red fluorescent powder and green fluorescent powder, and the mass ratio of the red fluorescent powder to the green fluorescent powder is 1:1 to 5:

1.

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

4. The backlight module of claim 1, wherein, The red dye comprises one or more of carmine, phthalocyanine red, and iron oxide red.

5. The backlight module of claim 1, wherein, The red fluorescent powder comprises fluoride red fluorescent powder, and the green fluorescent powder comprises nitride green fluorescent powder.

6. The backlight module of claim 1, wherein, The optical component is provided with a bubble structure.

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

1.

8. 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.

9. 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.

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

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