CN116744739A - Brightness enhancement film and display substrate - Google Patents
Brightness enhancement film and display substrate Download PDFInfo
- Publication number
- CN116744739A CN116744739A CN202310734685.1A CN202310734685A CN116744739A CN 116744739 A CN116744739 A CN 116744739A CN 202310734685 A CN202310734685 A CN 202310734685A CN 116744739 A CN116744739 A CN 116744739A
- Authority
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- China
- Prior art keywords
- light
- film layer
- brightness enhancement
- enhancement film
- emitting panel
- Prior art date
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- Granted
Links
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- 239000012790 adhesive layer Substances 0.000 description 1
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3016—Polarising elements involving passive liquid crystal elements
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/875—Arrangements for extracting light from the devices
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/875—Arrangements for extracting light from the devices
- H10K59/878—Arrangements for extracting light from the devices comprising reflective means
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/875—Arrangements for extracting light from the devices
- H10K59/879—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/8793—Arrangements for polarized light emission
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Liquid Crystal (AREA)
Abstract
The invention belongs to the technical field of displays, and discloses a brightness enhancement film and a display substrate. The display substrate structure sequentially comprises a light-emitting panel, a brightness enhancement film, a phase delay film and a linear polarizing plate. The brightness enhancement film comprises a blue light brightness enhancement film layer, a green light brightness enhancement film layer and a red light brightness enhancement film layer. By regulating the thickness of the red light brightening film and the green light brightening film, the red light brightening film and the green light brightening film are used as integral wave plates of blue light independently or integrally under the condition of ensuring that the brightening reflection of the light with corresponding wavelength, and the red light brightening film is used as integral wave plates of the green light brightening film. The brightness enhancement film provided by the invention obviously improves the light-emitting efficiency of the OLED display substrate.
Description
Technical Field
The invention belongs to the technical field of displays, and particularly relates to a brightness enhancement film and a display substrate.
Background
The organic electroluminescence (OLED) display technology has the advantages of simple structure, self-luminescence without a backlight source, high contrast, thin thickness, wide viewing angle, high reaction speed, wide use temperature range and the like, and can be used for flexible panels, so that the OLED display is widely applied to the display fields of mobile phones, computers, televisions and the like. OLED displays are typically composed of a light emitting panel, a phase retardation film, and a linear polarizer. However, the linear polarizing plate determines that only 50% of light emitted by the light-emitting panel can be utilized theoretically at most, and the rest of the light is absorbed by the polarizing plate, so that the utilization efficiency of the light emitted by the light-emitting panel in the display panel is less than 50%.
The patent with publication number CN110268290B provides brightness enhancement for light of a certain band of colors, but does not provide brightness enhancement for light in the entire visible band; in order to achieve brightness enhancement of the whole visible light wave band, a plurality of cholesteric liquid crystal films with different pitches are arranged in the patent with publication number of CN113985673A, CN217181267U, CN114582950A, CN216622753U, CN115079332A, and based on the fact that liquid crystal has a large double refractive index, the cholesteric liquid crystal film layer has a large phase delay effect relative to visible light with a small wavelength, so that other light-emitting efficiency is greatly reduced. Therefore, there is a need for a display panel and device that can improve the light utilization efficiency in an OLED display and improve the brightness of the display screen.
Disclosure of Invention
In view of the above technical problems, the present invention provides a brightness enhancement film, which can improve the light extraction efficiency of an OLED display substrate.
In order to achieve the technical effects, the invention adopts the following technical scheme:
the invention provides a brightness enhancement film, which is a multilayer cholesteric liquid crystal polymer with different screw pitch structures, and selectively passes left-handed circularly polarized light and reflects right-handed circularly polarized light according to the difference of the screw pitch and the rotation direction of the cholesteric reflective brightness enhancement film; or by right-circularly polarized light, reflecting left-circularly polarized light. For natural light and linearly polarized light, the cholesteric reflection brightness enhancement film converts incident light into about 50% of left-handed circularly polarized light and about 50% of right-handed circularly polarized light by self circular polarization bipolarity, one of the circularly polarized light is allowed to pass through the circularly polarized light and the other circularly polarized light is reflected, after the reflected circularly polarized light is reflected again by the reflecting electrode of the light-emitting panel, the rotation direction of the circularly polarized light is changed, and the circularly polarized light with the changed rotation direction can pass through the brightness enhancement layer. The circularly polarized light passing through the brightness enhancing layer is converted into linearly polarized light passing through the linearly polarizing layer through the phase delaying layer, and reaches the viewing angle side. The schematic diagram of the brightening principle is shown in fig. 8.
The invention relates to a brightness enhancement film, which comprises a blue light brightness enhancement film layer, wherein the pitch is P1, a green light brightness enhancement film layer, the pitch is P2, a red light brightness enhancement film layer and the pitch is P3, and the relation among P1, P2 and P3 is as follows: p3 is more than or equal to P2 is more than or equal to P1.
Further, in the brightness enhancement film provided by the invention, the blue light brightness enhancement film layer, the green light brightness enhancement film layer and the red light brightness enhancement film layer have six arrangement and combination sequences, and the arrangement sequence is any one of a to f:
a. the blue light brightness enhancement film layer is close to the light-emitting side of the light-emitting panel, the red light brightness enhancement film layer is positioned on the light-emitting side far away from the light-emitting panel, the green light brightness enhancement film layer is positioned between the red light brightness enhancement film layer and the blue light brightness enhancement film layer, the green light brightness enhancement film layer and the red light brightness enhancement film layer are integrally opposite to the light-emitting panel and emit a wave plate A with a blue light central wavelength, and the red light brightness enhancement film layer is opposite to the light-emitting panel and emits a wave plate B with a green light central wavelength;
b. the red light brightness enhancement film layer is positioned on the light-emitting side far away from the light-emitting panel, the blue light brightness enhancement film layer is positioned between the red light brightness enhancement film layer and the green light brightness enhancement film layer, the red light brightness enhancement film layer emits a C wave plate with blue light central wavelength relative to the light-emitting panel, emits a D wave plate with green light central wavelength relative to the light-emitting panel, and emits an E wave plate with blue light central wavelength relative to the light-emitting panel;
c. the blue light brightness enhancement film layer is close to the light-emitting side of the light-emitting panel, the green light brightness enhancement film layer is located on the light-emitting side far away from the light-emitting panel, the red light brightness enhancement film layer is located between the blue light brightness enhancement film layer and the green light brightness enhancement film layer, the whole red light brightness enhancement film layer and the green light brightness enhancement film layer emit F wave plates with blue light central wavelengths relative to the light-emitting panel, and the red light brightness enhancement film layer emits G wave plates with green light central wavelengths relative to the light-emitting panel;
d. the blue light brightness enhancement film layer is positioned on the light-emitting side far away from the light-emitting panel, the red light brightness enhancement film layer is positioned between the blue light brightness enhancement film layer and the green light brightness enhancement film layer, the red light brightness enhancement film layer emits an H wave plate with a green light central wavelength relative to the light-emitting panel, and the red light brightness enhancement film layer and the green light brightness enhancement film layer integrally emit an I wave plate with a blue light central wavelength relative to the light-emitting panel;
e. the red light brightening film layer is close to the light emitting side of the light emitting panel, the green light brightening film layer is located on the light emitting side far away from the light emitting panel, the blue light brightening film layer is located between the red light brightening film layer and the green light brightening film layer, the red light brightening film layer emits a J wave plate with green light center wavelength relative to the light emitting panel, the red light brightening film layer emits a K wave plate with blue light center wavelength relative to the light emitting panel, and the green light brightening film layer emits an L wave plate with blue light center wavelength relative to the light emitting panel;
f. the red light brightening film layer is close to the light emitting side of the light emitting panel, the blue light brightening film layer is located on the light emitting side far away from the light emitting panel, the green light brightening film layer is located between the blue light brightening film layer and the red light brightening film layer, the red light brightening film layer emits an M wave plate with a green light central wavelength relative to the light emitting panel, and the red light brightening film layer and the green light brightening film layer integrally emit an N wave plate with a blue light central wavelength relative to the light emitting panel;
the blue light refers to light with the wavelength of 380-480 nm, the green light refers to light with the wavelength of 500-580 nm, the red light refers to light with the wavelength of 580-680 nm, the central wavelength of the blue light is 460nm, the central wavelength of the green light is 530nm, and the central wavelength of the red light is 620nm;
all the A-N wave plates are full wave plates corresponding to the wavelengths of light.
Further, in the brightness enhancement film provided by the invention, the thickness of the red light brightness enhancement film layer, the thickness of the green light brightness enhancement film layer and the thickness of the blue light brightness enhancement film layer are 2-50 screw pitches, and each screw pitch is 200-600 nm.
The reflection wavelength is related to the pitch as follows:
λ=n * P * cos θ
in the above formula, lambda is the reflection wavelength, n is the refractive index of the cholesteric liquid crystal polymer, P is the pitch of the cholesteric liquid crystal polymer,is the angle between the incident light and the helical axis of the cholesteric liquid crystal polymer.
The single pitch reflection wavelength bandwidth is calculated by:
Δλ=Δn * P * cos θ
in the above formula, Δλ is the reflection bandwidth, and Δn is the in-plane birefringence of the cholesteric liquid crystal brightness enhancing film.
In the brightness enhancement film provided by the invention, when the brightness enhancement film is used for a display substrate, the wavelength of light emitted by a light emitting device in the self-luminous display substrate is 380-760 nm, so that for light with the wavelength of 380-760 nm, various cholesteric liquid crystal pitches are required when the cholesteric liquid crystal brightness enhancement film is prepared, and when the cholesteric liquid crystal brightness enhancement film has a plurality of pitches or has continuous pitch gradient distribution, the reflection wavelength bandwidth of the brightness enhancement film is the union of the reflection wavelength bandwidths of all pitches:
Δλ=Δn 1 * P 1 * cos θ 1 ∪Δn 2 * P 2 * cos θ 2 ∪...Δn n * P n * cos θ n
in the brightness enhancement film provided by the invention, the birefringence of the cholesteric liquid crystal brightness enhancement film is between 0.03 and 0.5, preferably between 0.05 and 0.3, and more preferably between 0.1 and 0.25.
Further, in the brightness enhancement film provided by the invention, the thickness of the pitch layer with the wavelength reflected is 2-30 pitches, and more preferably, the thickness is 5-10 pitches.
When the wavelength is longer than the wavelength bandwidth which can be regulated by the cholesteric liquid crystal, namely
λ＞n * P * cos θ
Light can now pass through the cholesteric liquid crystal film unaffected;
when the wavelength of light is smaller than the wavelength bandwidth which can be regulated by the cholesteric liquid crystal, namely
λ＜n * P * cos θ
The cholesteric liquid crystal film layer is a phase retardation function layer for light.
Further, in the brightness enhancement film provided by the invention, the brightness enhancement film is polymerized by ultraviolet irradiation, and the polymerization components comprise, by mass: 0 to 98 parts of polymerizable nematic liquid crystal, 0 to 98 parts of polymerizable discotic liquid crystal, 1 to 20 parts of chiral compound, 0.05 to 5 parts of ultraviolet light absorber and 0.1 to 10 parts of photoinitiator.
In another aspect, the present invention relates to a display substrate comprising, in order, a light emitting panel, the brightness enhancement film provided by the present invention, a phase retardation film, and a linear polarizing plate. The luminous panel, the brightness enhancement film, the phase delay film and the linear polarizing plate are adhered together through optical cement.
Further, in the display substrate provided by the invention, when the brightness enhancement film provided by the invention is used for the display substrate, the wavelength of light emitted by the light emitting device in the display substrate is 380-760 nm, and the pitch P of the brightness enhancement film used for the display substrate is 200-600 nm.
Further, in the display substrate provided by the invention, the brightness enhancement film is used for converting light with the wavelength of 380-760 nm emitted by the light-emitting panel into circularly polarized light, transmitting left circularly polarized light and reflecting right circularly polarized light; or transmitting right-handed circularly polarized light and reflecting left-handed circularly polarized light, wherein the rotating structure of the brightness enhancement film is matched with the phase delay film and the linear polarizing plate.
Further, in the display substrate provided by the invention, the phase retardation film is used for converting polarized light incident from the outside into circularly polarized light, and the phase retardation film is a single-layer phase retardation film; or by bonding multiple layers of phase delay films. The phase retardation film raw material adopts at least one of polymer stretching type inverse dispersion phase retardation film, polymer stretching type A plate phase retardation film, liquid crystal type inverse dispersion composite phase retardation film, liquid crystal type A plate phase retardation film, liquid crystal type O plate phase retardation film and liquid crystal type double-shaft phase retardation film.
Further, in the display substrate provided by the invention, the linear polarizing plate is used for converting light irradiated by the outside into polarized light, and the linear polarizing plate is an iodine-based polarizing plate; or a polarizing plate formed by sticking two layers of cellulose triacetate with one layer of polyvinyl alcohol sandwiched therebetween; or a polarizing plate prepared from a liquid crystal material doped with a dichroic dye, wherein when the linear polarizing plate is formed by sticking two layers of cellulose triacetate with one layer of polyvinyl alcohol sandwiched therebetween, one side of the cellulose triacetate is coated with a pressure-sensitive adhesive, a release film and a protective film.
Specifically, the invention also provides a preparation method of the brightness enhancement film:
process 1:
firstly, taking a light-emitting panel or other organic materials as a base material, coating the prepared liquid crystal mixture for the first brightness enhancement film layer on the base material layer through a coating process, heating and ventilating to remove a solvent in the liquid crystal mixture;
a second step of coating a liquid crystal mixture for a second brightness enhancement film layer on the first cholesteric liquid crystal film layer in the first step, and removing a solvent in the liquid crystal mixture through heating and ventilation;
thirdly, continuously coating a liquid crystal mixture for the third brightness enhancement film layer on the basis of the second step, heating and ventilating, and removing a solvent in the liquid crystal mixture;
and fourthly, irradiating and curing the multi-layer brightness enhancement liquid crystal mixture layer at a certain temperature by using ultraviolet lamps to prepare the required brightness enhancement film.
In the preparation process, the second brightening liquid crystal mixture layer coated in the second step and the first brightening liquid crystal mixture layer are provided with a mixed layer within a certain thickness depth range, and the thickness of the mixed layer is 10-500 nm; and (3) the third brightness enhancement liquid crystal mixture layer and the second brightness enhancement liquid crystal mixture layer coated in the third step are provided with mixed layers within a certain depth range, and the thickness of the mixed layers is 10-500 nm.
When the coating layers have liquid crystal film layers with different pitches, the thickness of each liquid crystal layer is different according to the sequence of the liquid crystal mixture layers with different pitches.
Process 2:
firstly, taking a luminous panel or other organic materials as a base material, coating a prepared first brightening film layer with a liquid crystal mixture on the base material layer through a coating process, heating and ventilating to remove a solvent in the liquid crystal mixture, and irradiating and curing the multi-layer brightening liquid crystal mixture layer at a certain temperature through ultraviolet lamps to prepare a required first brightening film;
the second step, taking the organic material as a base material, coating the prepared second brightening film layer on the base material layer by using a liquid crystal mixture through a coating process, heating and ventilating to remove a solvent in the liquid crystal mixture, and irradiating and curing the multi-layer brightening liquid crystal mixture layer by using ultraviolet lamps at a certain temperature to prepare a required second brightening film;
thirdly, taking an organic material as a base material, coating the prepared first brightness enhancement film layer with a liquid crystal mixture on the base material layer through a coating process, heating and ventilating to remove a solvent in the liquid crystal mixture, and irradiating and curing the multi-layer brightness enhancement liquid crystal mixture layer at a certain temperature through ultraviolet lamps to prepare a required third brightness enhancement film;
and fourthly, the first brightness enhancement film, the second brightness enhancement film and the third brightness enhancement film are adhered together through optical cement, and the optical cement has no double refraction.
The organic substrate is a common organic substrate, and is not particularly limited.
Compared with the prior art, the brightness enhancement film and the display substrate have the following technical effects:
by regulating the thickness of the red light brightening film and the green light brightening film, the red light brightening film and the green light brightening film are used as integral wave plates of blue light independently or integrally under the condition of ensuring that the brightening reflection of the light with corresponding wavelength, and the red light brightening film is used as integral wave plates of the green light brightening film. Meanwhile, the thickness of each brightness enhancement film layer is regulated, so that microcavity effect is formed between each brightness enhancement film layer and the reflecting electrode of the light-emitting panel, and the light-emitting efficiency is enhanced. The luminous efficiency of the luminous panel of the display substrate is improved by more than 10% compared with the prior art.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings referred to in the embodiments of the present invention, and it is obvious that the drawings listed are only a part of the contents of the embodiments of the present invention.
Fig. 1 is a schematic structural diagram of a display substrate according to the present invention.
Fig. 2 is a schematic diagram of the arrangement sequence of the layers of the brightness enhancement film according to the present invention, in which the sequence is R, G, B.
Fig. 3 is a schematic diagram of the arrangement sequence of the layers of the brightness enhancement film according to the present invention, in which the sequence is R, B, G.
Fig. 4 is a schematic diagram of the arrangement sequence of the layers of the brightness enhancement film according to the present invention, in which the sequence is B, G, R.
Fig. 5 is a schematic diagram of the arrangement sequence of the layers of the brightness enhancement film according to the present invention, in which the sequence is B, R, G.
Fig. 6 is a schematic diagram of the arrangement sequence of the layers of the brightness enhancement film according to the present invention, in which the sequence is G, R, B.
Fig. 7 is a schematic diagram of the arrangement sequence of the layers of the brightness enhancement film according to the present invention, wherein the sequence is G, B, R.
Reference numerals illustrate: r represents a red light brightening film layer, G represents a green light brightening film layer, and B represents a blue light brightening film layer.
Fig. 8 is a schematic view of the light path of the brightness enhancement principle of the brightness enhancement film according to the present invention. FIG. 9 is a graph showing the results of reflectance and transmittance tests of the brightness enhancement film according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
This example provides for the preparation of a brightness enhancing film structure with a light exit side from far to near in order R, G, B, as shown in fig. 2.
Firstly, taking PET as a substrate layer, coating a first brightness enhancement layer liquid crystal mixture (blue light brightness enhancement layer) on the substrate layer in a slit coating mode, heating at 120 ℃ and ventilating and curing for 2 minutes to ensure that liquid crystals in the liquid crystal compound are uniformly oriented, and simultaneously removing a solvent in the liquid crystal mixture;
secondly, continuously coating a second brightness enhancement layer liquid crystal mixture (green brightness enhancement layer) on the first brightness enhancement layer, heating and ventilating for curing for 2 minutes at 120 ℃ to ensure that liquid crystals in the liquid crystal compound are uniformly oriented, and simultaneously removing a solvent in the liquid crystal mixture;
thirdly, continuously coating a third brightness enhancing layer liquid crystal mixture (red light brightness enhancing layer) on the second brightness enhancing layer, heating and ventilating for curing for 2 minutes at 120 ℃ to ensure that the liquid crystal in the liquid crystal compound is uniformly oriented, and simultaneously removing the solvent in the liquid crystal mixture;
fourth, cooling the multi-layered liquid crystal mixture to 90 ℃ and using a metal halide lamp at 90 ℃ and 100mJ/cm 2 Irradiating ultraviolet rays to solidify the liquid crystal coating to form the brightness enhancement film layer.
The thickness of the brightness enhancement film layer is 12.5 mu m, the thickness of the first brightness enhancement film layer is 3.5 mu m, the thickness of the second brightness enhancement film layer is 4.2 mu m, the thickness of the third brightness enhancement film layer is 4.8 mu m, the pitch P1 of the first brightness enhancement film layer is 288nm, the first brightness enhancement film layer is used for regulating blue light, the pitch P2 of the second brightness enhancement film layer is 331nm, the second brightness enhancement film layer is used for regulating green light, the pitch P3 of the third brightness enhancement film layer is 388nm, and the third brightness enhancement film layer is used for regulating red light. The data of the transmitted and reflected light wavelengths of the brightness enhancement film comprising the first brightness enhancement film layer, the second brightness enhancement film layer, and the third brightness enhancement film layer are shown in fig. 9.
The first brightness enhancing layer liquid crystal mixture comprises the following components in percentage by weight:
liquid crystal compound 1:23 parts by mass; liquid crystal compound 2:28 parts by mass; liquid crystal compound 3:15 parts by mass; liquid crystal compound 4:22 parts by mass; liquid crystal compound 5:9 parts by mass; liquid crystal compound 6:32 parts by mass; chiral compound 1:2 parts by mass; 4-tert-butylphenyl iodonium diphenyliodonium tetrafluoroborate: 4 parts by mass; propylene glycol monomethyl ether acetate: 150 parts by mass; ethylene glycol dimethyl ether: 64 parts by mass. The structural formula of each component is as follows:
liquid crystal compound 1:
liquid crystal compound 2:
liquid crystal compound 3:
liquid crystal compound 4:
liquid crystal compound 5:
liquid crystal compound 6:
chiral compound 1:
the second brightness enhancing layer liquid crystal mixture was different from the first brightness enhancing layer liquid crystal mixture in that the chiral compound was 1.6 parts by mass.
The third brightness enhancing layer liquid crystal mixture was different from the first brightness enhancing layer liquid crystal mixture in that the chiral compound was 1.3 parts by mass.
Example 2
The difference between this embodiment and embodiment 1 is that the arrangement order of the red light brightness enhancement film layer, the green light brightness enhancement film layer and the blue light brightness enhancement film layer is different, and the order of the light emitting side from far to near is R, B, G, as shown in fig. 3. The thickness of the blue light brightness enhancement film layer is 3.5 mu m, the thickness of the green light brightness enhancement layer is 4.8 mu m, and the thickness of the red light brightness enhancement film is 5.2 mu m.
Example 3
The difference between this embodiment and embodiment 1 is that the arrangement order of the red light brightness enhancement film layer, the green light brightness enhancement film layer and the blue light brightness enhancement film layer is different, and the order of the light emitting side from far to near is G, R, B, as shown in fig. 4. The thickness of the blue light brightness enhancement film layer is 3.5 mu m, the thickness of the green light brightness enhancement layer is 4.4 mu m, and the thickness of the red light brightness enhancement film is 5.5 mu m.
Example 4
The difference between this embodiment and embodiment 1 is that the arrangement order of the red light brightness enhancement film layer, the green light brightness enhancement film layer and the blue light brightness enhancement film layer is different, and the order of the light emitting side from far to near is B, R, G, as shown in fig. 5. The thickness of the blue light brightness enhancement film layer is 3.5 mu m, the thickness of the green light brightness enhancement layer is 4.4 mu m, and the thickness of the red light brightness enhancement film is 5.5 mu m.
Example 5
The difference between this embodiment and embodiment 1 is that the arrangement order of the red light brightness enhancement film layer, the green light brightness enhancement film layer and the blue light brightness enhancement film layer is different, and the order of the light emitting side from far to near is G, B, R, as shown in fig. 6. The thickness of the blue light brightness enhancement film layer is 3.5 mu m, the thickness of the green light brightness enhancement layer is 4.8 mu m, and the thickness of the red light brightness enhancement film is 5.2 mu m.
Example 6
The difference between this embodiment and embodiment 1 is that the arrangement order of the red light brightness enhancement film layer, the green light brightness enhancement film layer and the blue light brightness enhancement film layer is different, and the order of the light emitting side from far to near is B, G, R, as shown in fig. 7. The thickness of the blue light brightness enhancement film layer is 3.5 mu m, the thickness of the green light brightness enhancement layer is 4.4 mu m, and the thickness of the red light brightness enhancement film is 5.5 mu m.
Example 7
The arrangement order of the respective brightness enhancing film layers in this example is the same as that in example 1, except that the liquid crystal material is different.
Wherein the proportion of each component in the red light brightening layer liquid crystal mixture is as follows:
liquid crystal compound 7:6 parts by mass; liquid crystal compound 8:34 parts by mass: liquid crystal compound 9:15 parts by mass; liquid crystal compound 10:15 parts by mass; liquid crystal compound 11:17 parts by mass; liquid crystal compound 12:16 parts by mass; liquid crystal compound 13:22 parts by mass; liquid crystal compound 14:16 parts by mass; chiral compound 1:1.3 parts by mass; 4-tert-butylphenyl iodonium diphenyliodonium tetrafluoroborate: 4 parts by mass; propylene glycol monomethyl ether acetate: 150 parts by mass; ethylene glycol dimethyl ether: 64 parts by mass.
The proportion of each component in the green light brightening layer liquid crystal mixture is as follows:
liquid crystal compound 15:6 parts by mass; liquid crystal compound 16:34 parts by mass; liquid crystal compound 17:15 parts by mass; liquid crystal compound 18:15 parts by mass; liquid crystal compound 19:17 parts by mass; liquid crystal compound 20:16 parts by mass; liquid crystal compound 21:22 parts by mass; liquid crystal compound 22:16 parts by mass; chiral compound 1:1.6 parts by mass; 4-tert-butylphenyl iodonium diphenyliodonium tetrafluoroborate: 4 parts by mass; propylene glycol monomethyl ether acetate: 150 parts by mass; ethylene glycol dimethyl ether: 64 parts by mass.
The blue light brightness enhancing layer liquid crystal mixture comprises the following components in percentage by weight:
liquid crystal compound 23:6 parts by mass; liquid crystal compound 24:34 parts by mass; liquid crystal compound 25:15 parts by mass; liquid crystal compound 26:15 parts by mass; liquid crystal compound 27:17 parts by mass; liquid crystal compound 28:16 parts by mass; liquid crystal compound 29:22 parts by mass; liquid crystal compound 30:16 parts by mass; chiral compound 1:2 parts by mass; 4-tert-butylphenyl iodonium diphenyliodonium tetrafluoroborate: 0.4 parts by mass; propylene glycol monomethyl ether acetate: 150 parts by mass; ethylene glycol dimethyl ether: 64 parts by mass.
The structural formula of each component is as follows:
liquid crystal compound 7:
liquid crystal compound 8:
liquid crystal compound 9:
liquid crystal compound 10:
liquid crystal compound 11:
liquid crystal compound 12:
liquid crystal compound 13:
liquid crystal compound 14:
liquid crystal compound 15:
liquid crystal compound 16:
liquid crystal compound 17:
liquid crystal compound 18:
liquid crystal compound 19:
liquid crystal compound 20:
liquid crystal compound 21:
liquid crystal compound 22:
liquid crystal compound 23:
liquid crystal compound 24:
liquid crystal compound 25:
liquid crystal compound 26:
liquid crystal compound 27:
liquid crystal compound 28:
liquid crystal compound 29:
liquid crystal compound 30:
。
example 8
The arrangement order of the brightness enhancement films in this embodiment is the same as that of embodiment 1, except that the brightness enhancement film layers in this embodiment are adhered together by optical cement. The preparation method comprises the following steps:
firstly, taking PET as a base material, coating the prepared first brightness enhancement film layer with a liquid crystal mixture on the base material layer through a coating process, heating at 120 ℃ and ventilating and curing for 2 minutes, removing a solvent in the liquid crystal mixture, and then irradiating and curing by ultraviolet lamps to prepare the required first brightness enhancement film;
secondly, taking the organic material as a base material, coating the prepared second brightness enhancement film layer on the base material layer by using a liquid crystal mixture through a coating process, heating and ventilating and curing for 2 minutes at 120 ℃, removing a solvent in the liquid crystal mixture, and then irradiating and curing by using ultraviolet lamps to prepare the required second brightness enhancement film;
thirdly, taking the organic material as a base material, coating the prepared first brightness enhancement film layer on the base material layer by using a liquid crystal mixture through a coating process, heating and ventilating and curing for 2 minutes at 120 ℃, removing a solvent in the liquid crystal mixture, and then irradiating and curing by using ultraviolet lamps to prepare a required third brightness enhancement film;
fourthly, the first brightness enhancement film, the second brightness enhancement film and the third brightness enhancement film are stuck together through optical cement.
Example 9
The brightness enhancement films prepared in examples 1 to 8 were used to detect light transmittance, haze, and color gamut of the display substrate, respectively.
The display substrate includes a light-emitting panel, any one of the brightness enhancement films of embodiments 1 to 8, a phase retardation film, a linear polarizing plate, and an optical adhesive layer between the layers. The luminous panel of the display substrate adopts the luminous panel in the Xiaomi 13 Ultra; the phase delay film is selected from Di person GT-138 model; the linear polarizing plate is selected from fir photoelectrical; the optical cement is selected from crown CR-7331ML.
Detection instrument: haze was measured using haze meter TH-100 (Hangzhou color spectrum technology Co., ltd.) and sRGB color gamut was measured using Shanghai's optical FX2000 spectrometer.
Comparative example 1
The difference is that the brightness enhancement film is selected from the full visible band brightness enhancement films of patent CN114582950a as in example 9.
Comparative example 2
The difference is that there is no brightness enhancement film as in example 9. The results are shown in Table 1.
Table 1, measurement results of example 9 and comparative example
In the above table, "example 9-1" means that the brightness enhancing film of example 1 is employed in a display substrate. As can be seen from the above table, the light extraction efficiency of examples 9-1 to 9-8 and comparative example 1 is higher than that of comparative example 2, indicating that the brightness enhancement film can improve the light extraction efficiency of the display substrate. The display substrates of examples 9-1 to 9-8 have a light output efficiency increased by 10% or more compared with that of comparative example 1, which means that the circularly polarized light output from the brightness enhancement film of examples 9-1 to 9-8 has a better circular polarization rate than that of comparative example 1, and the brightness enhancement film of examples 9-1 to 9-8 has a more uniform brightness enhancement effect for light of different wavelengths from the light-emitting panel, and thus has a better color gamut effect. Examples 9-7 are slightly better than the other examples because the brightness enhancing films of examples 9-7 have better reverse wavelength dispersion, as the liquid crystal materials are different.
The embodiments described above are only some, but not all, embodiments of the invention. The detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is merely representative of the preferred embodiments of the invention. All other embodiments obtained without inventive effort by a person skilled in the art, which are related deductions and substitutions made by the person skilled in the art under the condition of the inventive concept, are within the scope of protection of the present invention.
Claims (6)
1. The utility model provides a brightness enhancement film, its characterized in that includes blue light brightness enhancement film layer, pitch is P1, green light brightness enhancement film layer, and the pitch is P2, ruddiness brightness enhancement film layer, and the pitch is P3, P1, P2, P3's relation is: p3 is more than or equal to P2 is more than or equal to P1.
2. The brightness enhancing film of claim 1 for a display substrate further comprising a light emitting panel, wherein the arrangement order of the blue light brightness enhancing film layer, the green light brightness enhancing film layer, and the red light brightness enhancing film layer is any one of a to f:
a. the blue light brightness enhancement film layer is close to the light emitting side of the light emitting panel, the red light brightness enhancement film layer is far away from the light emitting side of the light emitting panel, the green light brightness enhancement film layer is positioned between the red light brightness enhancement film layer and the blue light brightness enhancement film layer, the green light brightness enhancement film layer and the red light brightness enhancement film layer are integrally opposite to the light emitting panel and emit a wave plate with blue light central wavelength, and the red light brightness enhancement film layer is opposite to the light emitting panel and emits a wave plate with green light central wavelength;
b. the green light brightness enhancement film layer is close to the light emitting side of the light emitting panel, the red light brightness enhancement film layer is located on the light emitting side far away from the light emitting panel, the blue light brightness enhancement film layer is located between the red light brightness enhancement film layer and the green light brightness enhancement film layer, the red light brightness enhancement film layer emits a C wave plate with blue light central wavelength relative to the light emitting panel, and emits a D wave plate with green light central wavelength relative to the light emitting panel, and the green light brightness enhancement film layer emits an E wave plate with blue light central wavelength relative to the light emitting panel;
c. the blue light brightness enhancement film layer is close to the light emitting side of the light emitting panel, the green light brightness enhancement film layer is far away from the light emitting side of the light emitting panel, the red light brightness enhancement film layer is positioned between the blue light brightness enhancement film layer and the green light brightness enhancement film layer, the red light brightness enhancement film layer and the green light brightness enhancement film layer integrally emit F wave plates with blue light central wavelength relative to the light emitting panel, and the red light brightness enhancement film layer emits G wave plates with green light central wavelength relative to the light emitting panel;
d. the green light brightness enhancement film layer is close to the light-emitting side of the light-emitting panel, the blue light brightness enhancement film layer is positioned on the light-emitting side far away from the light-emitting panel, the red light brightness enhancement film layer is positioned between the blue light brightness enhancement film layer and the green light brightness enhancement film layer, the red light brightness enhancement film layer emits an H wave plate with a green light central wavelength relative to the light-emitting panel, and the red light brightness enhancement film layer and the green light brightness enhancement film layer integrally emit an I wave plate with a blue light central wavelength relative to the light-emitting panel;
e. the red light brightening film layer is close to the light emitting side of the light emitting panel, the green light brightening film layer is located on the light emitting side far away from the light emitting panel, the blue light brightening film layer is located between the red light brightening film layer and the green light brightening film layer, the red light brightening film layer emits a J wave plate with green light central wavelength relative to the light emitting panel, the red light brightening film layer emits a K wave plate with blue light central wavelength relative to the light emitting panel, and the green light brightening film layer emits an L wave plate with blue light central wavelength relative to the light emitting panel;
f. the red light brightening film layer is close to the light emitting side of the light emitting panel, the blue light brightening film layer is located on the light emitting side far away from the light emitting panel, the green light brightening film layer is located between the blue light brightening film layer and the red light brightening film layer, the red light brightening film layer emits an M wave plate with green light central wavelength relative to the light emitting panel, and the red light brightening film layer and the green light brightening film layer integrally emit an N wave plate with blue light central wavelength relative to the light emitting panel;
the blue light is light with the wavelength of 380-480 nm, the green light is light with the wavelength of 500-580 nm, and the red light is light with the wavelength of 580-680 nm;
the blue light center wavelength is 460nm, the green light center wavelength is 530nm, and the red light center wavelength is 620nm;
the A-N wave plates are all full wave plates corresponding to the wavelengths of light.
3. A display substrate, characterized in that the structure comprises a light-emitting panel, the brightness enhancement film according to any one of claims 1 to 2, a phase retardation film, and a linear polarizing plate in this order.
4. The display substrate according to claim 3, wherein the brightness enhancement film is configured to convert light having a wavelength of 380 to 760nm emitted from the light-emitting panel into circularly polarized light, and to transmit left circularly polarized light and reflect right circularly polarized light; or transmitting right-handed circularly polarized light and reflecting left-handed circularly polarized light, wherein the rotating structure of the brightness enhancement film is matched with the phase delay film and the linear polarizing plate.
5. A display substrate according to claim 3, wherein the phase retardation film is for converting linearly polarized light incident from the outside into circularly polarized light;
the phase delay film is a single-layer phase delay film or is formed by bonding a plurality of layers of phase delay films;
the phase retardation film raw material adopts at least one of a polymer stretching type inverse dispersion phase retardation film, a polymer stretching type A plate phase retardation film, a liquid crystal type inverse dispersion composite phase retardation film, a liquid crystal type A plate phase retardation film, a liquid crystal type O plate phase retardation film and a liquid crystal type double-shaft phase retardation film.
6. A display substrate according to claim 3, wherein the linear polarizing plate is for converting light irradiated from the outside into linearly polarized light;
the linear polarizing plate includes an iodine-based polarizing plate;
or a polarizing plate formed by sticking two layers of cellulose triacetate with one layer of polyvinyl alcohol sandwiched therebetween;
or a polarizing plate prepared from a liquid crystal material doped with a dichroic dye, wherein when the linear polarizing plate is formed by sticking two layers of cellulose triacetate with one layer of polyvinyl alcohol sandwiched therebetween, one side of the cellulose triacetate is coated with a pressure-sensitive adhesive, a release film and a protective film.
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| CN202310734685.1A CN116744739B (en) | 2023-06-20 | 2023-06-20 | Brightness enhancement film and display substrate |
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| CN202310734685.1A CN116744739B (en) | 2023-06-20 | 2023-06-20 | Brightness enhancement film and display substrate |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1842583A (en) * | 2003-08-29 | 2006-10-04 | 3M创新有限公司 | Cholesteric liquid crystal copolymers and additives |
| CN106249330A (en) * | 2016-09-22 | 2016-12-21 | 张家港康得新光电材料有限公司 | brightness enhancement film, backlight module and display device |
| CN115079332A (en) * | 2022-08-18 | 2022-09-20 | 西安明为光学科技有限公司 | Brightness enhancement film and OLED display device |
| CN116634796A (en) * | 2023-04-17 | 2023-08-22 | 陕西晶彩明为科技有限公司 | Optical microcavity structure and OLED display panel |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1842583A (en) * | 2003-08-29 | 2006-10-04 | 3M创新有限公司 | Cholesteric liquid crystal copolymers and additives |
| CN106249330A (en) * | 2016-09-22 | 2016-12-21 | 张家港康得新光电材料有限公司 | brightness enhancement film, backlight module and display device |
| CN115079332A (en) * | 2022-08-18 | 2022-09-20 | 西安明为光学科技有限公司 | Brightness enhancement film and OLED display device |
| CN116634796A (en) * | 2023-04-17 | 2023-08-22 | 陕西晶彩明为科技有限公司 | Optical microcavity structure and OLED display panel |
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