Filter film and display module

Abstract

The invention relates to a filter film and a display module. A first light-absorbing dye is distributed in the filter film, the first light-absorbing dye has a structure as shown in a general formula (1): # imgabs0 #, and R1, R2, R3, R4, R5, R6 and R7 are independently selected from hydrogen atoms, carboxyl groups, ester groups, aldehyde groups, carbonyl groups and alkyl groups with the carbon atom number of 1-20; m is a divalent metal atom; the filter film can play a role in filtering and antireflection, so that the display effect and the contrast ratio of the display module with the filter film can be improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a filter film and a display module. Background Art

[0002] Organic Light-Emitting Diode (OLED) display devices are mostly used outdoors or indoors with natural light. However, in strong ambient light, OLED screens will produce reflections, resulting in a significant decrease in display quality and contrast. Summary of the invention

[0003] The embodiments of the present application provide a filter film and a display module, which can selectively absorb light to achieve the effect of filtering and reducing reflection.

[0004] The embodiment of the present application provides a filter film, wherein a first light absorbing dye is distributed in the filter film, and the first light absorbing dye has a structure as shown in general formula (1):

[0005]

[0006] Among them, R 1 , R 2 , R 3 , R 4 , R 5 , R 6 and R 7 Each is independently selected from a hydrogen atom, a carboxyl group, an ester group, an aldehyde group, a carbonyl group, and an alkyl group having 1 to 20 carbon atoms;

[0007] M is a divalent metal atom.

[0008] In one embodiment of the present application, R 1 , R 3 , R 4 , R 5 and R 7 Each is independently selected from a hydrogen atom and an alkyl group having 1 to 20 carbon atoms;

[0009] R 2 and R 6 Each is independently selected from a hydrogen atom, a carboxyl group, an ester group, an aldehyde group, a carbonyl group, and an alkyl group having 1 to 20 carbon atoms.

[0010] In one embodiment of the present application, R 1 and R 7 Each is independently selected from an alkyl group having 1 to 5 carbon atoms.

[0011] In one embodiment of the present application, M is selected from Mg, Mn, Co, Ni, Cu, Zn, Pd or Pb.

[0012] In one embodiment of the present application, in the first light absorbing dye, R on a methylene dipyrrole unit 1 and R on another methylenedipyrrole unit 7 The methylene dipyrrole units are staggered in a direction from one of the methylene dipyrrole units to another of the methylene dipyrrole units, and the structural formula of the methylene dipyrrole units is:

[0013]

[0014] Wherein, * represents the connection site between the methylene dipyrrole unit and M.

[0015] In one embodiment of the present application, the first light absorbing dye is selected from at least one of the following compounds:

[0016]

[0017]

[0018] In one embodiment of the present application, the maximum absorption wavelength of the filter film is greater than or equal to 430 nm and less than or equal to 530 nm.

[0019] In one embodiment of the present application, the absorption half-peak width of the filter film is less than or equal to 65 nm.

[0020] In one embodiment of the present application, the material of the filter film further includes a second light-absorbing dye, and the second light-absorbing dye includes at least one of a tetraazaporphyrin metal complex, squaric acid, and anthocyanin.

[0021] According to the above-mentioned purpose of the present application, an embodiment of the present application further provides a display module, which includes a display panel and the filter film, and the filter film is arranged on the light emitting side of the display panel.

[0022] The present application provides a filter film and a display module. By setting a first light-absorbing dye as shown in general formula (1) in the filter film, light with a wavelength near 490nm can be absorbed to play a role in filtering and reducing reflection. Therefore, the display effect and contrast of the display module with the filter film can be improved, and the polarizer and color filter layer in the related technology can be replaced, thereby improving the transmittance of the display module and reducing the cost.

[0023] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0025] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0026] Figure 1 A schematic diagram of the chemical structure and spatial structure of the first light absorbing dye provided in an embodiment of the present application;

[0027] Figure 2 A schematic diagram of the structure of a display module provided in an embodiment of the present application.

[0028] Description of reference numerals:

[0029] 101. a first methylene dipyrrole unit; 102. a second methylene dipyrrole unit; 10. a display module; 11. a display panel; 12. a filter film; 13. a cover plate. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0031] The embodiment of the present application provides a filter film, wherein a first light absorbing dye is distributed in the filter film, and the first light absorbing dye has a structure as shown in general formula (1):

[0032]

[0033] Among them, R 1 , R 2 , R 3 , R 4 , R 5 , R 6 and R 7 Each is independently selected from a hydrogen atom, a carboxyl group, an ester group, an aldehyde group, a carbonyl group, and an alkyl group having 1 to 20 carbon atoms;

[0034] M is a divalent metal atom.

[0035] In the implementation process, the embodiment of the present application can absorb light with a wavelength near 490nm by setting the first light-absorbing dye as shown in the general formula (1) in the filter film to play a role of filtering and anti-reflection; thereby, the display effect and contrast of the display module with the filter film can be improved, and the polarizer and color film layer in the related technology can be replaced, thereby improving the transmittance of the display module and reducing the cost.

[0036] Specifically, in some embodiments, R 1 , R 3 , R 4 , R 5 and R 7 Each is independently selected from a hydrogen atom, an alkyl group having 1 to 20 carbon atoms; R 2 and R 6 Each is independently selected from a hydrogen atom, a carboxyl group (-COOH), an ester group (-COO-), an aldehyde group (-CHO), a carbonyl group (-CO-), and an alkyl group having 1 to 20 carbon atoms.

[0037] Furthermore, in some embodiments, R 1 , R 3 , R 4 , R 5 and R 7 Each is independently selected from a hydrogen atom, an alkyl group having 1 to 15 carbon atoms; R 2 and R 6 Each is independently selected from a hydrogen atom, a carboxyl group (-COOH), an ester group (-COO-), an aldehyde group (-CHO), a carbonyl group (-CO-), and an alkyl group having 1 to 15 carbon atoms.

[0038] Furthermore, in some embodiments, R 1 , R 3 , R 4 , R 5 and R 7 Each is independently selected from a hydrogen atom, an alkyl group having 1 to 10 carbon atoms; R 2 and R 6 Each is independently selected from a hydrogen atom, a carboxyl group (-COOH), an ester group (-COO-), an aldehyde group (-CHO), a carbonyl group (-CO-), and an alkyl group having 1 to 10 carbon atoms.

[0039] More preferably, R 1 , R 3 , R 5 , R 7 is methyl, R 2 and R 6 is ethyl propionate, R 4 A hydrogen atom.

[0040] In some embodiments, M is selected from Mg, Mn, Co, Ni, Cu, Zn, Pd or Pb. The maximum absorption wavelength (λ max ) and the absorption half-peak width (Full Width at Half Maxima, FWHM) are adjusted to achieve the regulation of the absorption properties of the first absorbing dye.

[0041] It should be noted that the first light absorbing dye represented by the general formula (1) has two methylene dipyrrole units, and the structure of the methylene dipyrrole units is as follows:

[0042]

[0043] Wherein, * represents the connection site between the methylene dipyrrole unit and M, and two methylene dipyrrole units are connected to M.

[0044] In some embodiments, Figure 1 As shown, the first light absorbing dye includes a first methylene dipyrrole unit 101 and a second methylene dipyrrole unit 102; it can be understood that Figure 1 The first light absorbing dye is shown as R 1 , R 3 , R 5 , R 7 is methyl, R 2 and R 6 is ethyl propionate, R 4 Taking hydrogen atom as an example, the structure of the first light-absorbing dye is described.

[0045] in, Figure 1 A in FIG. 1 is a schematic diagram of the planar structure of the first light absorbing dye, and Figure 1 B is a schematic diagram of the three-dimensional structure of the first light-absorbing dye. In the embodiment of the present application, R 1 and R 7 The groups are selected so that the first methylene dipyrrole units 101 and the second methylene dipyrrole units 102 are staggered and not located on the same plane.

[0046] Specifically, R 1 and R 7 are independently selected from alkyl groups having 1 to 5 carbon atoms, and R on one of the methylenedipyrrole units 1 and R on another methylenedipyrrole unit 7 The R on the first methylene dipyrrole unit 101 is staggered along the direction from one of the methylene dipyrrole units to the other methylene dipyrrole unit.1 and R on the second methylene dipyrrole unit 102 7 The first methylene dipyrrole unit 101 is staggered in the direction from the first methylene dipyrrole unit 101 to the second methylene dipyrrole unit 102. 7 and R on the second methylene dipyrrole unit 102 1 The first methylene dipyrrole unit 101 is staggered in the direction toward the second methylene dipyrrole unit 102; thereby, the first light-absorbing dye molecules can be prevented from being planarized and aggregated, thereby improving the solubility of the first light-absorbing dye; in addition, R 1 and R 7 The number of carbon atoms in is less than or equal to 5, thereby avoiding excessive steric hindrance and reducing the difficulty and cost of preparing the first light-absorbing dye. For example, the preparation reaction temperature of the first light-absorbing dye can be reduced.

[0047] In some embodiments, the first light absorbing dye is selected from at least one of the following compounds:

[0048]

[0049]

[0050] In some embodiments, the maximum absorption wavelength of the filter film is greater than or equal to 430 nm and less than or equal to 530 nm; thus, the filter film can effectively absorb light with a wavelength between green light and blue light.

[0051] In some embodiments, the absorption half-peak width of the filter film is less than or equal to 65 nm, so that the filter film has a higher light absorption accuracy and reduces the absorption of green light and blue light by the filter film.

[0052] In some embodiments, the transmittance of the filter film is greater than or equal to 70%. Furthermore, the transmittance of the filter film is greater than or equal to 74%. When the filter film is used in a display module, it can not only play a role in filtering and reducing reflection, but also ensure the light output efficiency of the display module.

[0053] In some embodiments, the haze of the filter film is less than or equal to 1.35%. Further, the haze of the filter film is less than or equal to 1.31%.

[0054] In some embodiments, the material of the filter film also includes a second light-absorbing dye, which includes at least one of a tetraazaporphyrin metal complex, squaric acid, and anthocyanin; and the second light-absorbing dye can be used to absorb light with a wavelength between green light and red light, that is, it can be used to absorb light with a wavelength of 585nm, so that the filter film can transmit red light, blue light and green light.

[0055] It is understandable that the filter film may further include other light-absorbing dyes to absorb light of other wavelengths, and in the embodiment of the present application, the first light-absorbing dye is designed to effectively absorb light with a wavelength between green light and blue light.

[0056] In some embodiments, the optical filter film includes a substrate and a first light absorbing dye and a second light absorbing dye distributed in the substrate, and the material of the substrate may include an acrylic resin material.

[0057] It should be noted that the filter film provided in the embodiment of the present application can be used in the display module to play the role of filtering and reducing reflection; compared with the use of circular polarizers in OLED display panels in the prior art, the light output efficiency of the display module can be improved; compared with the preparation of color film layers in OLED display panels in the prior art, the number of light masks of the display module can be reduced, thereby reducing the cost of the display module; therefore, the filter film provided in the embodiment of the present application can replace the circular polarizer and color film layer of the display module to achieve the technical effect of reducing reflection.

[0058] In addition, the present embodiment also provides a preparation process of the first light absorbing dye, and the preparation process of the first light absorbing dye comprises: in a mixed solvent of dichloromethane and methanol, a hydrobromide of methylenedipyrrole (i.e., a metal ligand) and an acetate of a metal (M II (OAc) 2 ) or chloride salt (M II Cl 2 ) to carry out the reaction at room temperature or under heating. The specific reaction process is as follows:

[0059]

[0060] In some embodiments, the reaction temperature of the above reaction is 25 to 70 degrees. Considering the reaction time and the boiling point of the solvent, the reaction temperature is preferably 25 to 50 degrees, and the reaction temperature is more preferably 25 to 35 degrees. The reaction time is 1 to 24 hours, preferably 2 to 16 hours, and more preferably 3 to 12 hours.

[0061] Specifically, the preparation process of the first light absorbing dye is described in detail below in combination with the specific structure of the first light absorbing dye.

[0062] The metal ligand is methylene dipyrrole hydrobromide ligand L1, and the preparation process of the metal ligand is as follows:

[0063]

[0064] Add 2,4-dimethyl-3-pyrrole propionic acid ethyl ester (40mmol) and 2,4-dimethylpyrrole-3-propionic acid ethyl ester-5-carboxaldehyde (40mmol) to methanol (200mL) and stir at room temperature to fully dissolve. Gradually add 35-45% hydrobromic acid aqueous solution (15-20mL) while stirring. The addition process is accompanied by smoke and the formation of orange-red solids. After the addition is completed, stir the reaction at room temperature for 1 hour. After the reaction is completed, place the solution in a -20℃ freezer for one day. The mixture is filtered under reduced pressure, and the filter residue is then washed with deionized water to remove hydrobromic acid. The solid part is vacuum dried to obtain methylene dipyrrole hydrobromide ligand L1 (orange-red solid, yield 94%). The nuclear magnetic hydrogen spectrum data of methylene dipyrrole hydrobromide ligand L1 are: 1 HNMR (CDCl 3 ,400MHz) δ13.23(s,2H),7.44(s,1H),4.35(quart,4H),2.52(t,4H),2.33(s,6H),2.19(s,6H),1.43(s,4H),0.93(t,6H).

[0065] The structure of dye I is shown below:

[0066]

[0067] The preparation process of dye I includes: adding ligand L1 and cobalt acetate (CAS No. 71-48-7) in a molar ratio of (2 to 4): 1 to a mixed solvent of dichloromethane and methanol, and then adding triethylamine (CAS No. 121-44-8). A condenser is installed on the reaction device, and the reaction solution reacts at 25 to 50°C. After the reaction solution is cooled to room temperature, it is purified by a suction flash silica gel column to remove unreacted metal salts and insoluble impurities. The silica gel chromatography column is eluted with dichloromethane until the filtrate is basically colorless, and the filtrate is collected under negative pressure suction filtration. The collected organic solution is concentrated by a rotary evaporator and then recrystallized with dichloromethane and methanol. Finally, after suction filtration, methanol washing, and vacuum drying, the product (blue crystalline solid, yield 99%) is collected. The mass spectrum data of dye I is: Mass Spec.m / z:730.4[M+H] + .

[0068] The elemental analysis data of dye I are: Elem Anal. C, 75.62; H, 8.64; N, 7.76.

[0069] The structure of Dye II is shown below:

[0070]

[0071] The preparation process of dye II includes: adding ligand L1 and nickel acetate tetrahydrate (CAS No. 6018-89-9) in a molar ratio (2-4): 1 to a mixed solvent of dichloromethane and methanol, and then adding triethylamine (CAS No. 121-44-8). The reaction device is equipped with a condenser, and the reaction solution is reacted at 25-50°C. After the reaction solution is cooled to room temperature, it is purified by a suction flash silica gel column to remove unreacted metal salts and insoluble impurities. The silica gel chromatography column is eluted with dichloromethane until the filtrate is basically colorless, and the filtrate is collected under negative pressure suction filtration. The collected organic solution is concentrated by a rotary evaporator and then recrystallized with dichloromethane and methanol. Finally, after suction filtration, methanol washing, and vacuum drying, the product (green crystalline solid, yield 78%) is collected. The mass spectrum data of dye II is: Mass Spec.m / z:729.4[M+H] + .

[0072] The elemental analysis data of dye II are: Elem Anal. C, 75.68; H, 8.65; N, 7.76.

[0073] The structure of dye III is shown below:

[0074]

[0075] The preparation process of dye III includes: adding ligand L1 and copper acetate (CAS No. 142-71-2) in a molar ratio (2 to 4): 1 to a mixed solvent of dichloromethane and methanol, and then adding triethylamine (CAS No. 121-44-8). The reaction device is equipped with a condenser, and the reaction solution is reacted at 25 to 50°C. After the reaction solution is cooled to room temperature, it is purified by a suction flash silica gel column to remove unreacted metal salts and insoluble impurities. The silica gel chromatography column is eluted with dichloromethane until the filtrate is basically colorless, and the filtrate is collected under negative pressure suction filtration. The collected organic solution is concentrated by a rotary evaporator and then recrystallized with dichloromethane and methanol. Finally, after suction filtration, methanol washing, and vacuum drying, the product (blue crystalline solid, yield 99%) is collected. The mass spectrum data of dye III is: Mass Spec.m / z:734.4[M+H] + .

[0076] The elemental analysis data of dye III are: Elem Anal. C, 75.11; H, 8.62; N, 7.72.

[0077] The structure of dye IV is shown below:

[0078]

[0079] The preparation process of dye IV includes: adding ligand L1 and zinc acetate (CAS No. 557-34-6) in a molar ratio of (2 to 4): 1 to a mixed solvent of dichloromethane and methanol, and then adding triethylamine (CAS No. 121-44-8). The reaction device is equipped with a condenser, and the reaction solution is reacted at 25 to 50°C. After the reaction solution is cooled to room temperature, it is purified by a suction flash silica gel column to remove unreacted metal salts and insoluble impurities. The silica gel chromatography column is eluted with dichloromethane until the filtrate is basically colorless, and the filtrate is collected under negative pressure suction filtration. The collected organic solution is concentrated by a rotary evaporator and then recrystallized with dichloromethane and methanol. Finally, after suction filtration, methanol washing, and vacuum drying, the product (orange crystalline solid, yield 79%) is collected. The nuclear magnetic hydrogen spectrum data of dye IV are: 1 HNMR (CDCl 3 ,400HMz)δ7.03(s,2H),4.28(quart,8H),2.51(t,8H),2.30(s,12H),1.96(s,12H),1.40(t,8H),0.93(t,12H).

[0080] The mass spectrum data of dye IV is: Mass Spec.m / z:735.4[M+H] + .

[0081] The elemental analysis data of dye IV are: Elem Anal. C, 74.89; H, 8.52; N, 7.65.

[0082] The structure of dye V is shown below:

[0083]

[0084] The preparation process of dye V includes: adding ligand L1 and manganese acetate (CAS No. 638-38-0) in a molar ratio (2-4): 1 to a mixed solvent of dichloromethane and methanol, and then adding triethylamine (CAS No. 121-44-8). The reaction device is equipped with a condenser, and the reaction solution is reacted at 25-50°C. After the reaction solution is cooled to room temperature, it is purified by a suction flash silica gel column to remove unreacted metal salts and insoluble impurities. The silica gel chromatography column is eluted with dichloromethane until the filtrate is basically colorless, and the filtrate is collected under negative pressure suction filtration. The collected organic solution is concentrated by a rotary evaporator and then recrystallized with dichloromethane and methanol. Finally, after suction filtration, methanol washing, and vacuum drying, the product (pink crystalline solid, yield 84%) is collected. The mass spectrum data of dye V is: Mass Spec.m / z:726.4[M+H] +.

[0085] The elemental analysis data of dye V are: Elem Anal. C, 75.99; H, 8.73; N, 7.76.

[0086] The structure of dye VI is shown below:

[0087]

[0088] The preparation process of dye VI includes: adding ligand L1 and palladium acetate (CAS No. 3375-31-3) in a molar ratio (2 to 4): 1 to a mixed solvent of dichloromethane and methanol, and then adding triethylamine (CAS No. 121-44-8). The reaction device is equipped with a condenser, and the reaction solution is reacted at 25 to 50°C. After the reaction solution is cooled to room temperature, it is purified by a suction flash silica gel column to remove unreacted metal salts and insoluble impurities. The silica gel chromatography column is eluted with dichloromethane until the filtrate is basically colorless, and the filtrate is collected under negative pressure suction filtration. The collected organic solution is concentrated by a rotary evaporator and then recrystallized with dichloromethane and methanol. Finally, after suction filtration, methanol washing, and vacuum drying, the product (red crystalline solid, yield 96%) is collected. The nuclear magnetic hydrogen spectrum data of dye VI are: 1 HNMR (CDCl 3 ,400HMz)δ6.99(s,2H),4.22(quart,8H),2.50(t,8H),2.30(s,12H),1.95(s,12H),1.41(t,8H),0.92(t,12H).

[0089] The mass spectrum data of dye VI is: Mass Spec.m / z:777.4[M+H] + .

[0090] The elemental analysis data of dye VI are: Elem Anal. C, 70.98; H, 8.12; N, 7.30.

[0091] Furthermore, the present application provides embodiments 1 to 6, and dye I, dye II, dye III, dye IV, dye V and dye VI are used to prepare the filter film respectively.

[0092] In Example 1, dye I is added to acrylic UV curing glue at a content of 0.1-10.0 wt %, and the yellow-orange filter film is obtained through coating, leveling, heat baking and UV curing.

[0093] In Example 2, dye II is added to acrylic UV curing glue at a content of 0.1-10.0 wt %, and the yellow-orange filter film is obtained through coating, leveling, heat baking and UV curing.

[0094] In Example 3, the dye III is added to acrylic UV curing glue at a content of 0.1-10.0 wt %, and the yellow-orange filter film is obtained through coating, leveling, heat baking and UV curing.

[0095] In Example 4, dye IV is added to acrylic UV curing glue at a content of 0.1-10.0 wt %, and the yellow-orange filter film is obtained through coating, leveling, heat baking and UV curing.

[0096] In Example 5, dye V is added to acrylic UV curing glue at a content of 0.1-10.0 wt %, and the yellow-orange filter film is obtained through coating, leveling, heat baking and UV curing.

[0097] In Example 6, the dye VI is added to acrylic UV curing glue at a content of 0.1-10.0 wt %, and the yellow-orange filter film is obtained through coating, leveling, heat baking and UV curing.

[0098] Then, the UV-visible absorption spectrum and transmittance of the filter film prepared above were tested on a UV-visible spectrophotometer (instrument model Shimidzu UV-1800), and the data shown in the following Table 1 were obtained.

[0099] dye <![CDATA[λ max (nm)]]> FWHM(nm) T(％) Haze(%) I 493 29 87.43 0.99 II 497 60 84.17 1.11 III 498 65 86.56 1.31 IV 488 26 87.43 0.99 V 486 54 74.64 1.25 VI 472 32 80.23 1.05

[0100] It can be seen from Table 1 that the maximum absorption wavelength of the filter film made by using the first light-absorbing dye provided in the embodiment of the present application is between 472nm and 498nm, located near 490nm, and can effectively absorb light with a wavelength between green light and green light; the absorption half-peak width is less than or equal to 65nm, which can reduce the absorption of green light and blue light; and the transmittance of the filter film is greater than or equal to 74.64%, and the haze is less than or equal to 1.31%, so that the filter film has high transmittance.

[0101] As mentioned above, the embodiment of the present application can absorb light with a wavelength of about 490 nm by setting the first light-absorbing dye as shown in the general formula (1) in the filter film, so as to play the role of filtering and reducing reflection; thereby, the display effect and contrast of the display module having the filter film can be improved; the filter film provided by the embodiment of the present application can be used in the display module to play the role of filtering and reducing reflection; compared with the use of circular polarizers in OLED display panels in the prior art, the light extraction efficiency of the display module can be improved; compared with the preparation of color filter layers in OLED display panels in the prior art, the number of light masks of the display module can be reduced, thereby reducing the cost of the display module; therefore, the filter film provided by the embodiment of the present application can replace the circular polarizer and color filter layer of the display module to play the role of reducing reflection.

[0102] Also, please refer to Figure 2 The embodiment of the present application further provides a display module 10, which includes a display panel 11 and a filter film 12 as described in the above embodiment, and the filter film 12 can be arranged on the light-emitting side of the display panel 11 to play a role of filtering and reducing reflection.

[0103] In some embodiments, the display module 10 may further include a cover plate 13 disposed on a side of the filter film 12 away from the display panel 11 .

[0104] In summary, the filter film 12 provided in the embodiment of the present application can be used in the display module 10 to play the role of filtering and reducing reflection; compared with the use of a circular polarizer in the OLED display panel in the prior art, the light output efficiency of the display module can be improved, and compared with the preparation of a color film layer in the OLED display panel in the prior art, the number of light masks of the display module can be reduced, thereby reducing the cost of the display module; therefore, the filter film 12 provided in the embodiment of the present application can replace the circular polarizer and the color film layer of the display module 10 to play the role of reducing reflection.

[0105] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0106] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0107] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0108] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A filter film, characterized in that: A first light-absorbing dye is distributed in the filter film, and the first light-absorbing dye has a structure as shown in general formula (1): Among them, R 1 , R 2 , R 3 , R 4 , R 5 , R 6 and R 7 Each is independently selected from a hydrogen atom, a carboxyl group, an ester group, an aldehyde group, a carbonyl group, and an alkyl group having 1 to 20 carbon atoms; M is a divalent metal atom.

2. The filter film according to claim 1, characterized in that: R 1 , R 3 , R 4 , R 5 and R 7 Each is independently selected from a hydrogen atom and an alkyl group having 1 to 20 carbon atoms; R 2 and R 6 Each is independently selected from a hydrogen atom, a carboxyl group, an ester group, an aldehyde group, a carbonyl group, and an alkyl group having 1 to 20 carbon atoms.

3. The filter film according to claim 1, characterized in that: R 1 and R 7 Each is independently selected from an alkyl group having 1 to 5 carbon atoms.

4. The filter film according to claim 1, characterized in that: M is selected from Mg, Mn, Co, Ni, Cu, Zn, Pd or Pb.

5. The filter film according to claim 1, characterized in that: In the first light-absorbing dye, R on one methylene dipyrrole unit 1 and R on another methylenedipyrrole unit 7 The methylene dipyrrole units are staggered in a direction from one of the methylene dipyrrole units to another of the methylene dipyrrole units, and the structural formula of the methylene dipyrrole units is: Wherein, * represents the connection site between the methylene dipyrrole unit and M.

6. The filter film according to claim 1, characterized in that: The first light absorbing dye is selected from at least one of the following compounds:

7. The filter film according to any one of claims 1 to 6, characterized in that: The maximum absorption wavelength of the filter film is greater than or equal to 430 nm and less than or equal to 530 nm.

8. The filter film according to any one of claims 1 to 6, characterized in that: The absorption half-peak width of the filter film is less than or equal to 65nm.

9. The filter film according to any one of claims 1 to 6, characterized in that: The material of the filter film further includes a second light-absorbing dye, and the second light-absorbing dye includes at least one of a tetraazaporphyrin metal complex, squaric acid, and anthocyanin.

10. A display module, characterized in that: The display module comprises a display panel and the filter film according to any one of claims 1 to 9, wherein the filter film is arranged on a light-emitting side of the display panel.

Images