CN114141923A - Backlight module and display screen - Google Patents
Backlight module and display screen Download PDFInfo
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- CN114141923A CN114141923A CN202111254310.2A CN202111254310A CN114141923A CN 114141923 A CN114141923 A CN 114141923A CN 202111254310 A CN202111254310 A CN 202111254310A CN 114141923 A CN114141923 A CN 114141923A
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- blue light
- film
- backlight module
- particle material
- light filtering
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/201—Filters in the form of arrays
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/44—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the coatings, e.g. passivation layer or anti-reflective coating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
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- Optics & Photonics (AREA)
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Abstract
The invention provides a backlight module and a display screen, wherein the backlight module comprises a back plate and a backlight source arranged in the back plate, and the backlight source is provided with a light-emitting piece and a packaging piece coated on the periphery of the light-emitting piece; the optical diaphragm group is arranged on the back plate in a stacked mode and covers the light emitting surface of the light emitting piece; the surface of the packaging piece is pasted with a blue light filtering film containing a blue light filtering particle material, or the optical film group is mixed with the blue light filtering particle material. In the technical scheme provided by the invention, the blue light filtering film is arranged at the packaging part of the luminescent part, or the blue light filtering particle material is mixed in the optical diaphragm group, so that the peak short-wave blue light in the light emitted by the luminescent part is filtered out by the blue light filtering particle material to achieve the aim of eye protection, the half-wave width is further improved, the brightness and the color gamut are basically kept unchanged, and the visual effect is good.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module and a display screen.
Background
The LED light source is used in the current TV backlight, and the light emitting principle is that the chip emits high-energy short-wave blue light to excite the fluorescent powder to emit light. The blue light has short wavelength, high peak height and high energy, is not absorbed by cornea and crystalline lens, penetrates the cornea and the crystalline lens and directly enters macula and retina to cause damage of photoreceptor cells of macula and death of epithelial cells of retinal pigment to cause maculopathy, cataract and glaucoma, and causes injury to human eyes, and the peak short-wave blue light irradiation can cause cells to generate oxidation stress reaction and cytotoxin, reduce the oxidation resistance of fiber cells, and cause insomnia and visual fatigue. Therefore, how to solve the problem that the sharp short-wave blue light hurts eyes becomes a key for health display.
Disclosure of Invention
The invention mainly aims to provide a backlight module and a display screen, and aims to solve the problem that the sharp short-wave blue light hurts eyes.
In order to achieve the above object, the present invention provides a backlight module, which includes:
the backlight source is provided with a light emitting piece and a packaging piece which is coated on the periphery of the light emitting piece;
the optical diaphragm group is arranged on the back plate in a stacked mode and covers the light emitting surface of the light emitting piece;
the surface of the packaging piece is pasted with a blue light filtering film containing a blue light filtering particle material, or the optical film group is mixed with the blue light filtering particle material.
In an optional embodiment, the blue light filtering particle material at least includes one or more of azo, methine, ketoimide, azo metal complex, naphthalimide, nitrodiphenylamine, aminoketone, nitro and o-aniline.
In an alternative embodiment, the blocking rate of the blue light filtering particle material is 20% to 24%.
In an alternative embodiment, the optical film stack comprises:
the diffusion film, the reinforced film and the composite film are sequentially arranged on the back plate in a stacking mode, wherein the blue light filtering particle material is mixed in the diffusion film or the reinforced film or the composite film.
In an optional embodiment, the optical film set comprises a reinforcing film and a composite film which are sequentially stacked on the back plate;
the backlight module also comprises a diffusion plate, the diffusion plate is arranged between the enhancement film and the back plate, and the blue light filtering particle material is mixed in the diffusion plate or the enhancement film or the composite film.
In an optional embodiment, the composite film is a film formed by a diffusion sheet and a prism, or a film formed by a microlens and a prism, or a film formed by a diffusion sheet, a core layer and two prisms.
In an optional embodiment, the thickness of the blue light filtering film is 0.1um to 50 um.
In an optional embodiment, the backlight light source further comprises:
the LED packaging structure comprises a connecting seat, wherein a containing cavity is formed in the connecting seat, the light-emitting piece is placed in the containing cavity and is electrically connected with the connecting seat, and the packaging piece is filled in the containing cavity.
In an optional embodiment, the light emitting element is a blue light chip, and the emission wavelength of the blue light chip is 457.5nm to 460 nm.
In order to achieve the above object, an embodiment of the present invention further provides a display screen, where the display screen further includes the backlight module.
The invention provides a backlight module and a display screen, wherein the backlight module comprises a back plate and a backlight source arranged in the back plate, and the backlight source is provided with a light-emitting piece and a packaging piece coated on the periphery of the light-emitting piece; the optical diaphragm group is arranged on the back plate in a stacked mode and covers the light emitting surface of the light emitting piece; the surface of the packaging piece is pasted with a blue light filtering film containing a blue light filtering particle material, or the optical film group is mixed with the blue light filtering particle material. In the technical scheme provided by the invention, the blue light filtering film is arranged at the packaging part of the luminescent part, or the blue light filtering particle material is mixed in the optical diaphragm group, so that the peak short-wave blue light in the light emitted by the luminescent part is filtered out by the blue light filtering particle material to achieve the aim of eye protection, the half-wave width is further improved, the brightness and the color gamut are basically kept unchanged, and the visual effect is good.
Drawings
In order to more clearly illustrate the embodiments or exemplary technical solutions of the present invention, the drawings used in the embodiments or exemplary descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a backlight module according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a backlight source according to an embodiment of the invention;
FIG. 3 is a schematic structural diagram of a blue filter film according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a reflective film according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an enhancement film according to an embodiment of the invention;
FIG. 6 is a schematic structural view of a composite film (DOP) according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a composite film (MOP) according to an embodiment of the present invention;
FIG. 8 is a schematic view of a diffuser plate according to an embodiment of the present invention.
Description of the drawings:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a backlight module.
In an embodiment, as shown in fig. 1 and 2, the backlight module includes a back plate 1 and a backlight source 2 disposed in the back plate 1, the backlight source 2 has a light emitting member 21 and a package member 22 covering a periphery of the light emitting member 21; the optical diaphragm group 3 is arranged on the back plate 1 in a stacked mode and covers the light-emitting surface of the light-emitting piece 21; the surface of the package 22 is attached with a blue light filtering film 23 containing a blue light filtering particle material, or the optical film set 3 is mixed with the blue light filtering particle material. That is, in the technical scheme provided by the present invention, the blue light filtering film 23 is disposed at the package 22 of the light emitting element 21, or the blue light filtering particle material is mixed in the optical film set 3, so that the peak short-wave blue light in the light emitted by the light emitting element 21 is filtered out by the blue light filtering particle material to achieve the purpose of eye protection, thereby improving the half-wave width, and keeping the brightness and color gamut basically unchanged, and having good visual effect.
Further, the light emitting element 21 is a blue light chip, and the emission wavelength of the blue light chip is 457.5nm to 460 nm. Namely the encapsulation piece 22 of the illuminating piece 21 is provided with the blue light filtering film 23, the blue light filtering film 23 can directly follow the illuminating piece 21 to filter the harm of peak short wave blue light and maintain the health of human eyes.
Optionally, the package 22 is a package adhesive. The packaging adhesive plays a role in isolating air, can be selected from silica gel, and has the advantages of heat resistance, UV ultraviolet light resistance, water vapor resistance, cold and heat shock resistance, low thermal expansion coefficient and the like. Of course, the encapsulation adhesive may also include, but is not limited to, epoxy, silicone, polyurethane, and ultraviolet light curing encapsulation adhesive, and the like, and is not limited herein.
Further, no phosphor is mixed in the package 22, and at this time, the light emitting element 21 is a pure blue chip LED; alternatively, the package 22 may be mixed with YAG/KSF phosphor, and in this case, the light emitting element 21 is a blue chip LED that excites the YAG/KSF phosphor, which is not limited herein.
Further, as shown in fig. 2, the backlight source 2 further includes a connecting socket 24, a receiving cavity 25 is formed in the connecting socket 24, the light emitting element 21 is placed in the receiving cavity 25 and electrically connected to the connecting socket 24, and the package 22 is filled in the receiving cavity 25.
Alternatively, the connection socket 24 may function to support, conduct, dissipate heat and protect the chip, and the connection socket 24 may be made of PCT material, or the connection socket 24 may be made of PA, EMC, PPA, SMC, etc., without limitation.
Further, in order to realize the connection between the light emitting element 21 and the connection seat 24, the backlight source includes a connection line 26, one end of the connection line 26 is connected to the light emitting element 21, and the other end of the connection line 26 is connected to the connection seat 24.
Optionally, the connection line 26 is a gold wire, and the gold wire has the characteristics of good conductivity, high ductility and good weldability. Of course, in other embodiments, the connection line 26 may also be another type of connection line, and is not limited herein.
Further, the thickness of the blue light filtering film 23 is 0.1um to 50 um. The blue light filtering film 23 is a film formed by spraying or coating a blue light filtering particle material on the surface of the package 22.
Specifically, as shown in fig. 3, the blue light filtering particle film 23 includes a first protective coating 231, a second protective coating 232, and a blue light filtering layer 233 disposed between the first protective coating 231 and the second protective coating 232, wherein a blue light filtering particle material is mixed in the blue light filtering layer 233. Wherein, the first protective coating 231 and the second protective coating 232 are both AR coatings, which can reduce the intensity of reflected light, increase the transmittance, and thus reduce the loss of brightness; the blue light filtering layer 233 can weaken blue light and reduce the transmittance thereof, so as to reduce the harm of sharp short-wave blue light to human eyes, and a gap between the package 22 and the blue light filtering film 233 is filled with a package adhesive.
Alternatively, the blue light filtering film 233 may be formed by a UV curing, baking, drying, and the like, which are exemplary processes and are not modified in this embodiment.
Further, as shown in fig. 1, the optical film set 3 includes a diffusion film 31, an enhancement film 32, and a composite film 33 sequentially stacked on the back plate, wherein the blue light filtering particle material is mixed in the diffusion film 31, or the blue light filtering particle material is mixed in the enhancement film 32, or the blue light filtering particle material is mixed in the composite film 33.
Specifically, the blue light filtering particle material may be coated on the surface of the diffusion film 31 or the enhancement film 32 or the composite film 33, for example, the blue light filtering particle material is coated on the surface of a substrate and dried in a baking oven, wherein the operating temperature of the baking oven is 60 ℃ to 130 ℃, and then UV light irradiation curing is performed to harden and mold the substrate mixed with the blue light filtering particle material, so as to obtain the diffusion film 31 or the enhancement film 32 or the composite film 33 with at least one side mixed with the blue light filtering effect.
In conjunction with fig. 1 and 4, taking the example that the diffusion film 31 is mixed with the blue light filtering particle material, the upper surface or the lower surface of the diffusion film 31 is coated with the blue light filtering particle material, that is, the blue light filtering particles 311 shown in fig. 4. In this embodiment, the diffusion film 31 includes blue light filtering particles 311, diffusion particles 312, and a base material 313, where the base material 313 is a PET base material, has a light transmittance of 92%, can be formed by hardening and shaping in a manner of coating a scratch-resistant coating, silica gel, or the like, has a certain crystal orientation capability, and has good abrasion resistance, weather resistance, and optical properties. The thickness of the base material 313 is 120 um-125 um.
Alternatively, the diffusion particles 312 are made of acrylic resin material, and the composition of the acrylic resin material may be PMMA, PBMA, or nylon. The diffusion particles 312 are coated on the upper surface and the lower surface of the base material 313, wherein the diffusion particles 312 are coated on the upper surface of the base material 313, so that the diffusion particles 312 are exposed on the upper surface to refract and reflect the light source, so that the light source is atomized and scattered, and light is uniformly emitted; the diffusion particles 312 are coated on the lower surface of the substrate 313, so that the wear resistance of the lower surface of the substrate 313 is increased, and the plate is prevented from being scratched.
In this embodiment, the blue light filtering particles 311 and the diffusion particles 312 are mixed, so that the function of filtering high-energy spike short-wave blue light can be exerted, and the effect of protecting eyes can be achieved. Specifically, the blue-light-filtering particles 311 are coated on the upper surface or the lower surface of the substrate 313, for example, the diffusion particles 312 in the lower surface of the PET substrate are mixed with the blue-light-filtering particles 311, the PET substrate coated with the above raw materials is bonded and dried in a baking oven, and then the coated PET substrate is cured by UV irradiation, so that the film sheet mixed with the blue-light-filtering particles 311 is hardened and formed, and the diffusion film 31 with the blue-light-filtering effect on at least one surface of the PET substrate can be obtained.
Referring to fig. 1 and 5, taking the example that the blue light filtering particle material is mixed in the brightness enhancement film 32, since the upper surface of the brightness enhancement film 32 has a prism structure, it is not easy to coat, that is, in this embodiment, the blue light filtering particle material is coated on the lower surface of the brightness enhancement film 32. In this embodiment, the brightness enhancement film 32 includes blue light filtering particles 321, back coating particles 322, a substrate 323 and a prism structure 324, wherein the prism structure 324 is disposed on the upper surface of the substrate 323, and the substrate 323 is a PET substrate or a PC substrate, and can be formed by applying a scratch-resistant coating, a silica gel, and the like, and has a certain crystal orientation capability, and in addition, has good friction resistance, weather resistance, and optical performance. The thickness of the base material 323 is 120 um-125 um.
Alternatively, the back-coated particles 322 are made of acrylic resin material, and the composition thereof may be PMMA, PBMA, nylon. The back coating particles 322 are coated on the lower surface of the base material 323, wherein the back coating particles 322 are coated on the lower surface of the base material 323, so that the wear resistance of the lower surface of the base material 323 is improved, and the plate is prevented from being scratched.
In this embodiment, the blue light filtering particles 321 are mixed with the back coating particles 322, so that the function of filtering high-energy spike short-wave blue light can be exerted, and the effect of protecting eyes can be achieved. Specifically, the blue light filtering particles 321 are coated on the lower surface of the substrate 323, for example, the back coating particles 322 on the lower surface of the PET substrate are mixed with the blue light filtering particles 321, and the brightness enhancement film 32 with the blue light filtering effect on the lower surface of the PET substrate can be obtained through processes of unwinding, stress releasing, prism structure coating, UV curing, winding and the like.
Further, the composite film 33 is a film formed by a diffusion sheet and a prism, i.e., a DOP composite film. Referring to fig. 1 and 6, taking the example that the DOP composite film is mixed with the blue light filtering particle material, since neither the upper surface nor the lower surface of the DOP composite film has a prism structure, that is, in this embodiment, the upper surface or the lower surface of the DOP composite film may be coated with the blue light filtering particle material. In this embodiment, the DOP composite film includes blue light filtering particles 331, back coating particles 332, a base material 333 and a prism structure 334, where the number of the base material 333 is two, the prism structure 334 is disposed between the two base materials 333, the base material 333 is a PET base material or a PC base material, and the DOP composite film can be formed by hardening and shaping in a manner of coating a scratch-resistant coating, silica gel, or the like, and has a certain crystal orientation capability, and in addition, has good friction resistance, weather resistance, and optical properties. The thickness of the base material 333 is 120 um-125 um.
Alternatively, the back-coated particles 332 are made of acrylic resin material, and the components of the acrylic resin material can be PMMA, PBMA or nylon. The function of the back-coating particles 332 is the same as that of the back-coating particles 322, and is not limited herein.
In this embodiment, the blue light filtering particles 331 and the back coating particles 332 are mixed, so that the function of filtering high-energy peak short-wave blue light can be exerted, and the effect of protecting eyes can be achieved. Specifically, taking the example of coating the blue light filtering particles 331 on the lower surface of the substrate 333, the back coating particles 332 on the lower surface of the PET substrate mix the blue light filtering particles 331, and the PET substrate coated with the above raw materials is bonded and dried in a baking oven, and then the coated PET substrate is cured by UV irradiation, so that the film sheet mixed with the blue light filtering particles 331 is hardened and formed, and the DOP composite film having the effect of filtering blue light on at least one surface of the PET substrate can be obtained.
Further, the composite film 33 is a membrane formed by a microlens and a prism, that is, an MOP composite film. Referring to fig. 1 and 7, taking the example that the blue light filtering particle material is mixed in the MOP composite film, since the upper surface of the MOP composite film is in a microprism structure, it is not easy to coat, that is, in this embodiment, the blue light filtering particle material is coated on the lower surface of the MOP composite film. In this embodiment, the MOP composite film includes blue light filtering particles 335, back coating particles 336, two base materials 337, a prism structure 338, and a microprism structure 339, where the base materials 337 are two, the prism structure 338 is disposed between the two base materials 337, the microprism structure 339 is disposed on the upper surface of the MOP composite film, and the base materials 337 are PET base materials or PC base materials, and may be hardened and shaped by applying scratch-resistant coatings, silica gel, or the like, and have a certain crystal orientation capability, and in addition, have good friction resistance, weather resistance, and optical performance. The thickness of the base material 337 is 120 um-125 um.
Alternatively, the back-coated particles 332 are made of acrylic resin material, and the components of the acrylic resin material can be PMMA, PBMA or nylon. The back coating particles 332 are coated on the lower surface of the MOP composite film, and have a function identical to that of the back coating particles 322, which is not limited herein.
In this embodiment, the blue light filtering particles 335 are mixed with the back coating particles 336, so that the function of filtering high-energy spike short-wave blue light can be exerted, and the effect of protecting eyes can be achieved. Specifically, taking the example of coating the blue light filtering particles 335 on the lower surface of the substrate 337, the back coating particles 336 on the lower surface of the PET substrate are mixed with the blue light filtering particles 335, the PET substrate coated with the above raw materials is bonded and dried in a baking oven, then the coated PET substrate is cured by UV irradiation, so that the film sheet mixed with the blue light filtering particles 331 is hardened and formed, and the MOP composite film having the blue light filtering effect on at least one surface of the PET substrate is obtained by a microprism forming process.
Further, the composite film 33 is a film formed by a diffusion sheet, a core layer and two prisms, that is, a COPP composite film, and a way of coating blue light filtering particles on the COPP composite film is the same as a way of coating blue light filtering particles on the MOP composite film, which is not described herein.
Further, in part of the backlight module, the optical film group 3 does not have a reflective film therein, that is, the optical film group 3 includes a reinforcing film 32 and a composite film 33 sequentially stacked on the back plate 1; at this time, the backlight module further includes a diffusion plate (not shown) disposed between the enhancement film 32 and the back plate 1, wherein the diffusion plate or the enhancement film 32 or the composite film 33 is mixed with the blue-light-filtering particle material.
In this embodiment, as shown in fig. 1 and 8, for example, the diffusion plate is mixed with the blue light filtering particle material, because both the upper and lower surfaces of the diffusion plate have no prism structure, that is, the upper surface or the lower surface of the diffusion film 31 is coated with the blue light filtering particle material. In this embodiment, the diffusion plate includes blue light filtering particles 60, diffusion particles 61 and a base material 62, wherein the base material 62 is a PET base material, has a light transmittance of 92%, can be formed by hardening and shaping in a manner of coating a scratch-resistant coating, silica gel, and the like, has a certain crystal orientation capability, and has good abrasion resistance, weather resistance and optical performance. The thickness of the substrate 62 is 120 um-125 um.
Alternatively, the diffusion particles 61 are made of acrylic resin material, and the composition of the acrylic resin material can be PMMA, PBMA or nylon. The diffusion particles 61 are coated on the upper surface and the lower surface of the base material 313, wherein the diffusion particles 61 are coated on the upper surface of the base material 62, so that the diffusion particles 61 are exposed on the upper surface to refract and reflect the light source, so that the light source is atomized and scattered, and light is uniformly emitted; the diffusion particles 61 are coated on the lower surface of the substrate 62, so that the wear resistance of the lower surface of the substrate 62 is increased, and the plate is prevented from being scratched.
In this embodiment, the blue light filtering particles 60 are mixed with the diffusion particles 61, so that the function of filtering high-energy spike short-wave blue light can be exerted, and the effect of protecting eyes can be achieved. Specifically, the blue-light-filtering particles 61 are coated on the upper surface or the lower surface of the substrate 62, for example, the diffusion particles 61 in the lower surface of the PET substrate are mixed with the blue-light-filtering particles 60, the PET substrate coated with the above raw materials is attached and dried in a baking oven, and then the coated PET substrate is cured by UV irradiation, so that the film mixed with the blue-light-filtering particles 60 is hardened and formed, and the diffusion plate with the blue-light-filtering effect on at least one surface of the PET substrate can be obtained.
Based on that the enhancement film 32 or the composite film 33 is mixed with the blue light filtering particle material, the method is the same as that described in the above embodiments, and details are not repeated here.
Based on the above embodiments, the blue light filtering particle material is a blue light blocking dye or pigment, for example, the blue light filtering particle material at least includes one or more of azo, methine, ketoimide, azo metal complex, naphthalimide, nitrodiphenylamine, aminoketone, nitro and o-aniline, which is not limited herein.
Of course, in other embodiments, the blue light filtering particle material may be any one or a mixture of monoazo, bisazo, azo-methine, ketoimido-methine, anthraquinone, quinoline, azine, xanthene, thioxanthene, benzothiazole, benzimidazole, benzanthrone, benzimidazole, acenaphthene, spirooxazine-spiropyran, lactone, coumarin, lead chromate, cadmium yellow, oxy yellow, bismuth vanadate, aramide, benzidine, organometallic complex, azocalcium salt and other azo salts, isoindolinone, quinacridone, anthrapyrimidine, flavanthrone, isoindoline, azo condensation, bisazo condensation, diaryl o-benzoyl benzene, anthraquinone, and benzimidazolone, and is not limited herein.
Further, when the blue light blocking rate of the blue light filtering particle material is too low, the effect of filtering blue light is not obvious; when the blue light blocking rate of the blue light filtering particle material is too high, harmless blue light is filtered, so that color distortion is caused, therefore, in the embodiment, the blocking rate of the blue light filtering particle material can be selected to be in the range of 20% -24%, and at the moment, the blue light filtering effect is the best. The blue light of the blue light filtering particle material is blocked in a ratio of a blue light absorption peak value to a total peak value within a wave band of 440 nm-460 nm. In the range of 380-780nm, the transmittance of the blue light filtering particle material can be more than 80%, and the haze can be more than 85%.
That is, in this embodiment, blue light is filtered through the collocation and blue light particles are reduced to reduce the ratio of blue light, the harm of high-energy short-wave blue light can be effectively reduced, the peak and the half-wave width of short-wave blue light are changed, the peak of blue light is reduced by about 30%, the half-wave width is increased by 2nm, so that the spectrogram of a display screen is close to the continuous spectrum of natural light, the peak of blue light can be effectively filtered, the screen display effect cannot be yellow and dim, the original color temperature of the display can be maintained, the health of a user is guaranteed, the optimal viewing effect is provided, the eye health of the user is safeguarded, and the backlight scheme of preventing blue light and protecting the eye function can be realized.
Optionally, the scheme is applied to the fields of TVs, electronic device display screens, display products, and the like, and is not limited herein. The scheme of coating the blue light filtering particles is suitable for various machine types, and the selection of the blue light filtering particles is diversified.
This embodiment, through luminance, shortwave blue light account for than, sharp peak value, half wave width come the scheme of assessing this patent to be superior to ordinary scheme in a poor light to filtering peak shortwave blue light reaches eyeshield effect. The short-wave blue light proportion is defined by T, and in the range of 400-. The peak value is denoted by U, and the peak value of the blue light measured by the diaphragm backlight module without coating the blue light filtering particles is defined as 1. The half-wave width is denoted by Δ λ and is defined as the interval between two wavelengths corresponding to 1/2 of the radiation power of the peak emission wavelength. The color gamut is characterized by the standard commonly used for domestic TV backlighting, DCIP 3. The patent compares a common backlight scheme (without filtering blue light particles) with a scheme with a coating for filtering blue light particles, and the specific test results are shown in the following table:
compared with the scheme of coating and filtering blue light particles, the scheme of coating the blue light particles on the diaphragm by adopting the scheme of filtering the blue light particles can reduce peak short-wave blue light by about 30 percent, obviously reduce the ratio T value of the peak short-wave blue light, effectively reduce the blue light intensity in the range of 400-450nm, reduce the brightness value less than 1 percent, increase the half-wave width by 2nm, improve the half-wave width, basically keep the color gamut unchanged, reduce the damage of the peak short-wave blue light to human eyes, filter harmful part of the blue light, ensure that the image quality is not biased to be dark and improve the visual effect.
Based on the embodiment, the invention further provides a display screen.
In this embodiment, the display screen includes the backlight module according to the above embodiment.
Since the display screen of this embodiment includes the backlight module of the above embodiment, that is, the display screen of this embodiment includes all technical features and achieved technical effects of the above embodiment, specific reference is made to the description of the above embodiment, and details are not repeated here.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the specification and the drawings, or any other related technical fields directly or indirectly applied thereto under the conception of the present invention are included in the scope of the present invention.
Claims (10)
1. A backlight module is characterized in that the backlight module comprises:
the backlight source is provided with a light emitting piece and a packaging piece which is coated on the periphery of the light emitting piece;
the optical diaphragm group is arranged on the back plate in a stacked mode and covers the light emitting surface of the light emitting piece;
the surface of the packaging piece is pasted with a blue light filtering film containing a blue light filtering particle material, or the optical film group is mixed with the blue light filtering particle material.
2. The backlight module as claimed in claim 1, wherein the blue light filtering particle material at least comprises one or more of azo, methine, ketoimide, azo metal complex, naphthalimide, nitrodiphenylamine, aminoketone, nitro and o-aniline.
3. The backlight module as claimed in claim 2, wherein the blocking ratio of the blue light filtering particle material is 20% to 24%.
4. A backlight module according to claim 1, wherein the optical film set comprises:
the diffusion film, the reinforced film and the composite film are sequentially arranged on the back plate in a stacking mode, wherein the blue light filtering particle material is mixed in the diffusion film or the reinforced film or the composite film.
5. The backlight module as claimed in claim 1, wherein the optical film assembly comprises a reinforcing film and a composite film sequentially stacked on the back plate;
the backlight module also comprises a diffusion plate, the diffusion plate is arranged between the enhancement film and the back plate, and the blue light filtering particle material is mixed in the diffusion plate or the enhancement film or the composite film.
6. The backlight module as claimed in claim 4 or 5, wherein the composite film is a film formed by a diffusion sheet and a prism, or a film formed by a micro lens and a prism, or a film formed by a diffusion sheet, a core layer and two prisms.
7. The backlight module as claimed in claim 1, wherein the thickness of the blue-filtering film is 0.1um to 50 um.
8. A backlight module according to claim 1, wherein the backlight source further comprises:
the LED packaging structure comprises a connecting seat, wherein a containing cavity is formed in the connecting seat, the light-emitting piece is placed in the containing cavity and is electrically connected with the connecting seat, and the packaging piece is filled in the containing cavity.
9. The backlight module as claimed in claim 1, wherein the light emitting element is a blue light chip, and the emission wavelength of the blue light chip is 457.5nm to 460 nm.
10. A display screen, characterized in that the display screen comprises a backlight module according to any one of claims 1-9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111254310.2A CN114141923A (en) | 2021-10-27 | 2021-10-27 | Backlight module and display screen |
| PCT/CN2022/113718 WO2023071459A1 (en) | 2021-10-27 | 2022-08-19 | Backlight module and display screen |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111254310.2A CN114141923A (en) | 2021-10-27 | 2021-10-27 | Backlight module and display screen |
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| WO (1) | WO2023071459A1 (en) |
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|---|---|---|---|---|
| WO2023071459A1 (en) * | 2021-10-27 | 2023-05-04 | 惠州视维新技术有限公司 | Backlight module and display screen |
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| CN117031810A (en) * | 2023-07-12 | 2023-11-10 | 惠科股份有限公司 | Backlight module and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104570173A (en) * | 2014-12-11 | 2015-04-29 | 太湖金张科技股份有限公司 | Blue-light-proof optical diffusion structures and backlight device |
| CN110687716A (en) * | 2018-07-04 | 2020-01-14 | 深圳Tcl新技术有限公司 | Backlight module |
| CN111679492A (en) * | 2020-05-29 | 2020-09-18 | 太湖金张科技股份有限公司 | Backlight module containing blue light blocking reflection film and liquid crystal display panel |
| CN113296312A (en) * | 2021-05-14 | 2021-08-24 | 惠州视维新技术有限公司 | Display device |
| CN114141923A (en) * | 2021-10-27 | 2022-03-04 | 惠州视维新技术有限公司 | Backlight module and display screen |
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| WO2023071459A1 (en) * | 2021-10-27 | 2023-05-04 | 惠州视维新技术有限公司 | Backlight module and display screen |
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