CN212276018U - Backlight module and blue light prevention display device - Google Patents
Backlight module and blue light prevention display device Download PDFInfo
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- CN212276018U CN212276018U CN201921687193.7U CN201921687193U CN212276018U CN 212276018 U CN212276018 U CN 212276018U CN 201921687193 U CN201921687193 U CN 201921687193U CN 212276018 U CN212276018 U CN 212276018U
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Abstract
The application discloses a backlight module, which comprises a blue light cut-off filter film; the blue light cut-off filter film comprises perovskite quantum dots and a matrix; the central wavelength of the blue light cut-off filter film is 400-480 nm. And a blue light prevention display device comprising the backlight module.
Description
Technical Field
The application relates to a blue light prevention display device of a backlight module agent, and belongs to the field of blue light prevention display.
Background
Liquid Crystal Display (LCD) technology began to replace kinescope technology in the display field in the 90 s. With the development of technology and the progress of liquid crystal panel manufacturing process technology, the application scenes of LCD products are gradually developed from small-size screens to large-size screens. In the process of LCD technology development, the technical change of the backlight is an important milestone. The european union in 2003 announced that the Cold Cathode Fluorescent Lamp (CCFL) backlight technology began to exit the market as the instruction "restricting the use of certain hazardous substances in electronic and electrical equipment" (RoHS) was implemented since 2006, and Light Emitting Diode (LED) backlight display technology was replaced. LEDs have high power consumption and good color rendering. At present, a blue light LED chip is mainly used for exciting yellow fluorescent powder to obtain white backlight, so that the proportion of blue light in the LCD backlight is higher. Researches show that the high proportion of blue light in the LED is easy to cause harm to eyes, and the problem has attracted the attention of countries and consumers. First, harmful blue light has extremely high energy and can penetrate the lens to the retina, causing atrophy and even death of the retinal pigment epithelium. The death of light-sensitive cells will lead to a loss of vision or even complete loss, which is irreversible. Blue light can also cause macular degeneration. The lens in human eyes absorbs part of blue light and gradually becomes turbid to form cataract, most of the blue light penetrates through the lens, especially the lens of children is clear and cannot effectively resist the blue light, and therefore macular degeneration and cataract are easily caused. Second, since the wavelength of blue light is short, the focal point does not fall on the center of the retina, but is located a little bit further forward from the retina. To be clear, the eyeball is in a tense state for a long time, causing asthenopia. The long-time visual fatigue may cause the symptoms of deepening of myopia, appearing of diplopia, easy serialization during reading, incapability of concentrating attention and the like, and influences the learning and working efficiency of people. Third, blue light inhibits the secretion of melatonin, which is an important hormone affecting sleep, and is known to promote sleep and regulate jet lag. This can explain why playing a mobile phone or tablet before sleeping can cause poor sleep quality and even difficulty in falling asleep.
Harmful blue light wave band which can be contacted in life is 415nm-455nm, at present, people have developed a plurality of technologies for preventing blue light damage, one of the technologies is one of blue light prevention protective films, most of the blue light prevention films are coated with a plurality of layers of films with different refractive indexes by adopting a vacuum coating method or added with a high-concentration yellow series blue light absorbent, and the process is complicated and the manufacturing cost is increased by adopting the method for coating a plurality of layers of films with different refractive indexes by adopting the vacuum coating method; the method of adding the yellow system blue light absorbent can cause color deviation, reduce the display quality of electronic products and influence the use experience of users on the products. Based on the above information, it is necessary to develop a blue light protection film that is easy to prepare, can accurately and efficiently filter blue light, and does not cause display color difference.
SUMMERY OF THE UTILITY MODEL
According to one aspect of the present application, a backlight module is provided.
The backlight module is characterized by comprising a blue light cut-off filter film;
the blue light cut-off filter film comprises perovskite quantum dots and a matrix;
the central wavelength of the blue light cut-off filter film is 400-480 nm.
Optionally, the perovskite quantum dots are dispersed in the matrix.
Optionally, the size of the perovskite quantum dots in at least one dimension is 2-50 nm.
Optionally, the material of the matrix is a polymer;
the material of the substrate is selected from at least one of polyvinylidene fluoride, polyvinylidene fluoride and trifluoroethylene copolymer, polyacrylonitrile, polyvinyl acetate, cellulose acetate, cyano cellulose, polysulfone, aromatic polyamide, polyimide, polycarbonate, polystyrene and polymethyl methacrylate;
the perovskite quantum dots comprise at least one quantum dot selected from a structural formula shown in a formula I;
A3Bi2X9formula I
Wherein A is selected from (CH)3NH2CH3 +)、CH3NH3 +At least one of; x is selected from Cl-、Br-、I-At least one of (1).
Optionally, the mass ratio of the matrix to the perovskite quantum dots is 1-100: 1.
optionally, the mass ratio of the matrix to the perovskite quantum dots is 1-100: 1.
optionally, the mass ratio of the matrix to the perovskite quantum dots is 1-30: 1.
optionally, the mass ratio of the host to the perovskite quantum dots is 3: 1.
optionally, the upper limit of the mass ratio of the host to the perovskite quantum dots is selected from 100:1, 80:1, 50:1, 30:1, 10:1, 9:1, 8:1, 7:1, 6:1, 5:1, 4:1, 3: 1 or 2: 1; the lower limit is selected from 80:1, 50:1, 30:1, 10:1, 9:1, 8:1, 7:1, 6:1, 5:1, 4:1, 3: 1. 2:1 or 1: 1.
Optionally, the thickness of the blue light cut-off filter film is 0.001-5 mm.
Optionally, the blue light cut-off filter film further comprises a barrier film;
the barrier film is laminated on the blue light cut-off filter film.
Optionally, at least one barrier film is laminated on the upper and lower surfaces of the blue light cut-off filter film.
Optionally, the material of the barrier film is selected from at least one of polyvinylidene chloride film, ethylene-vinyl alcohol copolymer film, m-dimethylamine and adipic acid polycondensate film, and oxide-plated film.
Optionally, the thickness of the barrier film is 15um to 500 um.
Optionally, the backlight module comprises a light emitting unit, a reflective film, a light homogenizing part and a blue light cut-off filter film; the light reflecting film is arranged opposite to the light homogenizing part and forms a light guide space;
the light emitted by the light emitting unit is homogenized in the light guide space and emitted from the light homogenizing part.
Optionally, the light reflecting film is in face-to-face opposition to the light uniforming member.
Optionally, the blue light cut-off filter film, the dodging component and the reflective film are sequentially arranged from top to bottom.
Optionally, the backlight module is a side-in type backlight module;
the light homogenizing part is plate-shaped and is opposite to the reflective film;
the light emitting unit is arranged on one side of the light uniformizing component, and light emitted by the light reflecting unit enters the light uniformizing component and is reflected by the reflecting film to be emitted from the light uniformizing component.
Optionally, the backlight module is a direct type backlight module;
the light-emitting unit is arranged on the reflective film; the light-emitting film comprises a plurality of light-reflecting units; the light emitting unit includes: the LED lamp comprises a groove structure fixed on the reflecting film, a blue LED chip and yellow fluorescent powder fixed in the groove structure, and an arc prism covered on the groove.
Optionally, the direct type backlight module sequentially includes from bottom to top: the device comprises a reflecting film, a diffusion plate, a blue light cut-off light filtering film, a lower brightness enhancement sheet and an upper brightness enhancement sheet; or
Straight following formula backlight unit from the bottom up includes in proper order: the light-emitting diode comprises a reflecting film, a blue light cut-off light-filtering film, a diffusion plate, a lower brightness enhancement sheet and an upper brightness enhancement sheet.
Optionally, the side-in backlight module sequentially includes, from bottom to top: the device comprises a reflecting film, a light guide plate, a blue light cut-off light filter film, a diffusion film, a lower brightness enhancement sheet and an upper brightness enhancement sheet; or
Side income formula backlight unit from the bottom up includes in proper order: the backlight module comprises a reflective film, a light guide plate, a diffusion film, a blue light cut-off light filter film, a lower brightness enhancement sheet and an upper brightness enhancement sheet.
According to another aspect of the present application, there is provided a blue light prevention display device, comprising:
the backlight module; and
a liquid crystal panel.
Optionally, the liquid crystal panel sequentially includes, from bottom to top: a lower polarizer, an optical filter, a TFT-LCD and an upper polarizer.
In the present application, the term "cut-off depth" refers to the maximum transmittance of light that is allowed to pass through the cut-off band.
In the present application, "peak transmittance" refers to the maximum transmittance of the optical filter in the pass band.
The beneficial effects that this application can produce include:
1) the quantum dot provided by the application has larger cut-off depth, the central wavelength can cover 400-480nm, and is continuously adjustable in the range, and meanwhile, the quantum dot has a very steep absorption cut-off edge, so that the harmful blue light part (<455nm) can be filtered as far as possible, the blue light of the harmless part is reserved, and the color cast problem caused by the existing blue light prevention technology during blue light filtering is solved.
2) The blue light prevention layer in the blue light prevention film provided by the application adopts an in-situ preparation technology, the prepared filter film is smooth in surface and good in repeatability, and compared with the existing blue light prevention technology, the preparation process is simpler and faster.
3) A provided by the application3Bi2X9The surfaces of the quantum dots are coated by the polymer matrix, and simultaneously, the upper surface and the lower surface of the blue light prevention layer are respectively adhered with the water and oxygen barrier films, which can further enhance A3Bi2X9The stability of the quantum dots promotes the practical application of the anti-blue film.
Drawings
FIG. 1 is a white light spectrum of a blue LED chip + yellow phosphor backlight display before and after the display uses a blue cut filter; wherein (a) is an intensity graph before and after blue light filtering, and (b) is a normalized intensity graph before and after blue light filtering.
FIG. 2 is a white light spectrum of a blue LED chip + green + red quantum dot film display before and after the display uses a blue cut filter.
Fig. 3(a) shows a direct type backlight structure.
Fig. 3(b) shows a side-in type backlight structure.
Fig. 4 is a schematic structural diagram of a blue light cut-off prevention filter film based on perovskite quantum dots.
FIG. 5 is an XRD pattern of sample F-5.
FIG. 6 is a TEM image of sample F-5.
FIG. 7 is a spectrum of sample F-1 after passing blue light; wherein (a) is an intensity graph before and after blue light filtering, and (b) is a normalized intensity graph before and after blue light filtering.
Reference numerals:
Detailed Description
The present application will be described in detail with reference to examples, but the present application is not limited to these examples.
The raw materials in the examples of the present application were all purchased commercially, unless otherwise specified.
The analysis method in the examples of the present application is as follows:
fluorescence emission spectroscopy was performed using a FLSP920 fluorescence spectrometer.
XRD spectrum analysis was carried out using Shimadzu X-ray diffractometer 6100.
TEM photographs were taken with JEOL JEM-2200 FS.
The application provides a backlight module, which comprises a blue light cut-off filter film (102);
the blue light cut-off filter film comprises perovskite quantum dots and a matrix;
the central wavelength of the blue light cut-off filter film is 400-480 nm.
Optionally, the blue light cut filter film further comprises a barrier film (101);
the barrier film is laminated on the blue light cut-off filter film.
Optionally, the backlight module comprises a light emitting unit, a reflective film, a light homogenizing part and a blue light cut-off filter film; the light reflecting film is arranged opposite to the light homogenizing part and forms a light guide space;
the light emitted by the light emitting unit is homogenized in the light guide space and emitted from the light homogenizing part.
Optionally, the light reflecting film is in face-to-face opposition to the light uniforming member.
Optionally, the blue light cut-off filter film, the dodging component and the reflective film are sequentially arranged from top to bottom.
Optionally, the backlight module is a side-in type backlight module;
the light homogenizing part is plate-shaped and is opposite to the reflective film;
the light emitting unit is arranged on one side of the light uniformizing component, and light emitted by the light reflecting unit enters the light uniformizing component and is reflected by the reflecting film to be emitted from the light uniformizing component.
Optionally, the backlight module is a direct type backlight module;
the light-emitting unit is arranged on the reflective film; the light-emitting film comprises a plurality of light-reflecting units; the light emitting unit includes: the LED lamp comprises a groove structure fixed on the reflecting film, a blue LED chip (211) and yellow fluorescent powder (212) fixed in the groove structure, and an arc prism (210) covered on the groove.
Optionally, the direct type backlight module sequentially includes from bottom to top: the backlight module comprises a light reflecting film (209), a diffusion plate (208), a blue light cut-off filter film (207), a lower brightness enhancement sheet (206) and an upper brightness enhancement sheet (205); as shown in fig. 3 (a); or
Straight following formula backlight unit from the bottom up includes in proper order: a light reflecting film (209), a blue light cut-off filter film (207), a diffusion plate (208), a lower brightness enhancement sheet (206) and an upper brightness enhancement sheet (205);
side income formula backlight unit from the bottom up includes in proper order: the backlight module comprises a light reflecting film (314), a light guide plate (315), a blue light cut-off filter film (312), diffusion films (308 and 311), a lower brightness enhancement sheet (310) and an upper brightness enhancement sheet (309); as shown in FIG. 3 (b); or
Side income formula backlight unit from the bottom up includes in proper order: the backlight module comprises a light reflecting film (314), a light guide plate (315), diffusion films (308 and 311), a blue light cut-off filter film (312), a lower brightness enhancement sheet (310) and an upper brightness enhancement sheet (309).
The present application further provides a blue light prevention display device, which includes:
the backlight module; and
a liquid crystal panel.
Optionally, the liquid crystal panel sequentially includes, from bottom to top: a lower polarizer, an optical filter, a TFT-LCD and an upper polarizer.
Example 1
(1) Dissolving the polymer in an organic solvent, controlling the ratio of the polymer: the mass ratio of the organic solvent is 1: and (15) mechanically stirring for not less than 6 hours to completely dissolve the polymer in the organic solvent to obtain a clear and transparent solution, namely a solution A. The polymer is polymethyl methacrylate (PMMA); the organic solvent is N, N-Dimethylformamide (DMF).
(2) Mixing MABr powder and BiBr3Mixing the powders, and controlling the molar ratio as follows: BiBr3: MABr ═ 7: 10, adding an organic solvent, and controlling the mass ratio as follows: organic solvent: (BiBr)3+ MABr) ═ 1: 0.045, mixing and mechanically stirring for 6h to obtain a clear and transparent solution, namely a solution B. The organic solvent in this step is N, N-Dimethylformamide (DMF).
(3) Mixing the solution A in the step (1) with the solution B in the step (2), and controlling the mass ratio as follows: solution A: solution b 1: and (5) mechanically stirring for 12 hours to obtain a uniformly mixed precursor solution.
(4) Pouring the precursor solution in the step (3) on a transparent glass sheet, casting a wet film, then placing the transparent glass sheet coated with the precursor solution in a vacuum drying oven, wherein the air pressure of the vacuum drying oven is 0.1MPa, the temperature is 50 ℃, placing for 10min, and removing the organic solvent. Taking out the glass sheet with solvent removed from the vacuum drying oven, and placing on a heating plate at 130 deg.C for 30min to obtain MA3Bi2Br9The quantum dots are generated in situ in the PMMA matrix.
(5) The blue light prevention layer is protected by adopting a polymethyl methacrylate adhesive and a PVA material to coat a high-barrier film water-oxygen barrier film, and a perovskite quantum dot-based blue light cut-off filter film F-1 is obtained.
The structure of the blue-light prevention film is shown in fig. 4, and the blue-light cut-off filter film based on the perovskite quantum dots sequentially comprises the following components from bottom to top: a water oxygen barrier layer (barrier film), a blue light prevention layer (namely a blue light cut filter film based on perovskite quantum dots) and a water oxygen barrier layer.
Example 2
The specific operation is the same as that in example 1, except that the polymer in the step (1) is polyvinylidene fluoride (PVDF), and a blue light cut-off filter film F-2 based on perovskite quantum dots is obtained.
Example 3
The specific procedure was the same as in example 1, except that the solution A in step (3): the mass ratio of the solution B is 2:1, obtaining the perovskite quantum dot-based blue light prevention cut-off filter film F-3.
Example 4
The specific procedure was the same as in example 1, except that the solution A in step (3): the mass ratio of the solution B is 1:1, obtaining the perovskite quantum dot-based blue light prevention cut-off filter film F-4.
Example 5
The specific operation is the same as that in example 1, except that the polymer in the step (1) is Polyacrylonitrile (PAN), and the perovskite quantum dot-based blue light prevention cut-off filter film F-5 is obtained.
Example 6
XRD analysis was performed on the samples F-1 to F-5 prepared in examples 1 to 5. A typical XRD spectrogram is shown in figure 5, and corresponding to a sample F-5, the X-ray diffraction spectrum data shows that MA in the prepared perovskite quantum dot optical film3Bi2Br9Belonging to the trigonal system (P3 m1) in which diffraction peaks at 8.9 °, 17.7 ° and 26.7 ° correspond to (001), (002) and (003) in the standard card, respectively, and it was revealed that MA was obtained3Bi2Br9Perovskite quantum dots.
TEM analysis was performed on the samples F-1 to F-5 prepared in examples 1 to 5. A typical TEM spectrum is shown in FIG. 6, corresponding to sample F-5, showing MA3Bi2Br9The perovskite quantum dots are uniformly distributed in the polymer matrix, so that the perovskite quantum dot optical film has high transparency.
Samples F-1 to F-5 prepared in examples 1 to 5 were subjected to spectral analysis. The white light passed through samples F-1 to F-5, and typical spectra are shown in FIGS. 1 and 2, corresponding to sample F-1. The result shows that after the white light passes through F-1 to F-5, the blue light with the wavelength of 400nm to 450nm is filtered, and the blue light with the wavelength of 450nm to 500nm passes through.
Samples F-1 to F-5 prepared in examples 1 to 5 were subjected to spectral analysis. Blue light passes through samples F-1 to F-5, and a typical spectrum is shown in FIG. 7, corresponding to sample F-1. The result shows that after the blue light passes through F-1 to F-5, the blue light of 400nm to 450nm is filtered, the blue light of 450nm to 500nm passes through, and no light with other wavelengths is generated.
Example 7
The samples F-1 to F-5 prepared in examples 1 to 5 were used for a blue light prevention display device. The structure of the blue light prevention display device is shown in fig. 3(a) (direct type backlight module). Prevent blue light display device, from the bottom up includes in proper order: a direct type backlight module and a liquid crystal panel; the direct type backlight module comprises a blue light cut-off filter film. Straight following formula backlight unit from the bottom up includes in proper order: the backlight module comprises a reflecting film, a diffusion plate, a blue light cut-off light filtering film, a lower brightness enhancement sheet and an upper brightness enhancement sheet. The light reflecting film comprises a plurality of light emitting units; the light emitting unit includes: the LED lamp comprises a groove structure fixed on the reflecting film, a blue LED chip and yellow fluorescent powder fixed in the groove structure, and an arc prism covered on the groove. The liquid crystal panel sequentially comprises from bottom to top: a lower polarizer, an optical filter, a TFT-LCD and an upper polarizer.
The white light spectrograms before and after the filter film F-1 is adopted are shown in FIG. 1, and the result shows that the blue light with the short wavelength below 450nm is filtered after the blue light is filtered, and the blue light with the long wavelength above 450nm is reserved.
Example 8
The samples F-1 to F-5 prepared in examples 1 to 5 were used for a blue light prevention display device. The structure of the blue light prevention display device is shown in fig. 3 (b). Prevent blue light display device, from the bottom up includes in proper order: the side-in type backlight module comprises a side-in type backlight module and a liquid crystal panel; the side-entrance type backlight module comprises a blue light cut-off filter film. Side income formula backlight unit from the bottom up includes in proper order: the device comprises a reflective film, a light guide plate, a blue light cut-off light filter film, a lower brightness enhancement sheet and an upper brightness enhancement sheet. The light source of the side-in type backlight module is arranged on one side of the light guide plate. The liquid crystal panel sequentially comprises from bottom to top: a lower polarizer, an optical filter, a TFT-LCD and an upper polarizer.
The white light spectrograms before and after the filter film F-1 is adopted are shown in FIG. 2, and the result shows that the blue light with the short wavelength below 450nm is filtered after the blue light is filtered, and the blue light with the long wavelength above 450nm is reserved.
Example 9
This application prevent blue light membrane can be used to prevent blue light glasses lens. The rest steps are the same as example 1, except that in the step (4), the precursor solution is poured onto a common lens, a wet film is cast, then the transparent glass sheet coated with the precursor solution is placed in a vacuum drying oven, the air pressure of the vacuum drying oven is 0.1MPa, the temperature is 50 ℃, the vacuum drying oven is placed for 10min, and the organic solvent is removed. Taking out the glass sheet with solvent removed from the vacuum drying oven, and placing on a heating plate at 130 deg.C for 30min to obtain MA3Bi2Br9The quantum dots are generated in situ in the PMMA matrix. The blue light prevention layer is protected by adopting a polymethyl methacrylate adhesive and a PVA material to coat a high-barrier film water oxygen barrier film. The spectrum test of the blue light prevention spectacle lens shows that the short-wavelength blue light below 450nm is filtered after the blue light is filtered, and the long-wavelength blue light above 450nm is reserved.
Example 10
This application prevent blue light membrane can be used to prevent blue light illuminating device, paste the blue light membrane of preventing that embodiment 1 prepares in illuminating device inboard or outside, filter the blue light. The spectrum test of the blue light-proof illuminating device shows that the blue light with short wavelength below 450nm is filtered out after the blue light is filtered out, and the blue light with long wavelength above 450nm is reserved.
Although the present application has been described with reference to a few embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application as defined by the appended claims.
Claims (10)
1. A backlight module is characterized by comprising a blue light cut-off filter film;
the blue light cut-off filter film comprises perovskite quantum dots and a matrix;
the central wavelength of the blue light cut-off filter film is 400-480 nm.
2. The backlight module as claimed in claim 1, wherein the blue light cut filter has a thickness of 0.001-5 mm.
3. The backlight module as claimed in claim 1, wherein the blue light cut filter further comprises a barrier film;
the barrier film is laminated on the blue light cut-off filter film.
4. The backlight module according to claim 1, wherein the backlight module comprises a light emitting unit, a reflective film, a light homogenizing member and a blue light cut-off filter film; the light reflecting film is arranged opposite to the light homogenizing part and forms a light guide space;
the light emitted by the light emitting unit is homogenized in the light guide space and emitted from the light homogenizing part.
5. The backlight module according to claim 4, wherein the backlight module is a side-in type backlight module;
the light homogenizing part is plate-shaped and is opposite to the reflective film;
the light emitting unit is arranged on one side of the light uniformizing component, and light emitted by the light emitting unit enters the light uniformizing component and is reflected by the reflecting film to be emitted from the light uniformizing component.
6. The backlight module according to claim 4, wherein the backlight module is a direct-type backlight module;
the light-emitting unit is arranged on the reflective film; the light reflecting film comprises a plurality of light emitting units; the light emitting unit includes: the LED lamp comprises a groove structure fixed on the reflecting film, a blue LED chip and yellow fluorescent powder fixed in the groove structure, and an arc prism covered on the groove.
7. The backlight module according to claim 5,
side income formula backlight unit from the bottom up includes in proper order: the device comprises a reflecting film, a light guide plate, a blue light cut-off light filter film, a diffusion film, a lower brightness enhancement sheet and an upper brightness enhancement sheet; or
Side income formula backlight unit from the bottom up includes in proper order: the backlight module comprises a reflective film, a light guide plate, a diffusion film, a blue light cut-off light filter film, a lower brightness enhancement sheet and an upper brightness enhancement sheet.
8. The backlight module according to claim 6,
straight following formula backlight unit from the bottom up includes in proper order: the device comprises a reflecting film, a diffusion plate, a blue light cut-off light filtering film, a lower brightness enhancement sheet and an upper brightness enhancement sheet; or
Straight following formula backlight unit from the bottom up includes in proper order: the light-emitting diode comprises a reflecting film, a blue light cut-off light-filtering film, a diffusion plate, a lower brightness enhancement sheet and an upper brightness enhancement sheet.
9. A blue light prevention display device, comprising:
a backlight module according to any one of claims 1 to 8; and
a liquid crystal panel.
10. The blue-light prevention display device according to claim 9, wherein the liquid crystal panel comprises, in order from bottom to top: a lower polarizer, an optical filter, a TFT-LCD and an upper polarizer.
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