CN109143662B - Quantum dot color filter substrate and display panel - Google Patents

Quantum dot color filter substrate and display panel Download PDF

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Publication number
CN109143662B
CN109143662B CN201811019422.8A CN201811019422A CN109143662B CN 109143662 B CN109143662 B CN 109143662B CN 201811019422 A CN201811019422 A CN 201811019422A CN 109143662 B CN109143662 B CN 109143662B
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liquid crystal
quantum dot
guest
layer
substrate
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CN109143662A (en
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侯俊
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TCL Huaxing Photoelectric Technology Co Ltd
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TCL Huaxing Photoelectric Technology Co Ltd
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    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509Filters, e.g. light shielding masks
    • G02F1/133514Colour filters
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/137Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/13725Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on guest-host interaction

Abstract

The invention discloses a quantum dot color filter substrate and a display panel, wherein the substrate comprises: a glass substrate; a quantum dot conversion layer disposed on the glass substrate and including sequentially arranged colored quantum dots; a guest-host liquid crystal layer disposed between the glass substrate and the quantum dot conversion layer, the guest-host liquid crystal layer being filled with a guest-host liquid crystal mixture including liquid crystal and dichroic dye dissolved in the liquid crystal, the dichroic dye being rotatable with rotation of the liquid crystal under control of an external electric field. Through the mode, the problem that the quantum dot display is yellow in dark state can be solved to a certain extent, and the service life of the quantum dot display is prolonged.

Description

Quantum dot color filter substrate and display panel
Technical Field
The invention relates to the technical field of display, in particular to a quantum dot color filter substrate and a display panel.
Background
The quantum dot material has photoluminescence property, small spectral half-peak width and high color purity, and can effectively improve the visual angle and color gamut of the liquid crystal display and improve the display effect when being applied to a light-emitting unit of the display.
In the prior art, the quantum dot conversion layer made of the quantum dot material is arranged close to the glass substrate, when the quantum dot display is in a dark state, incident ambient light reaching the quantum dot conversion layer may excite the quantum dot material of the quantum dot conversion layer to emit light, and at this time, the quantum dot display is in a yellow state, which may reduce the service life of the quantum dot display.
In a long-term research and development process, the inventor of the present application finds that in the prior art, in a dark state, a quantum dot display is in a yellow state, so that the service life of the quantum dot display is reduced.
Disclosure of Invention
The invention mainly solves the technical problem of providing a quantum dot color filter substrate and a display panel, which can solve the problem that a quantum dot display is yellow in a dark state to a certain extent and prolong the service life of the quantum dot display.
In order to solve the technical problems, the invention adopts a technical scheme that: a quantum dot color filter substrate is provided.
Wherein the substrate includes:
a glass substrate;
a quantum dot conversion layer disposed on the glass substrate and including sequentially arranged colored quantum dots;
a guest-host liquid crystal layer disposed between the glass substrate and the quantum dot conversion layer, the guest-host liquid crystal layer being filled with a guest-host liquid crystal mixture including liquid crystal and dichroic dye dissolved in the liquid crystal, the dichroic dye being rotatable with rotation of the liquid crystal under control of an external electric field.
In order to solve the technical problem, the invention adopts another technical scheme that: a quantum dot color filter display panel is provided.
Wherein the display panel includes:
the quantum dot color filter substrate comprises one quantum dot color filter substrate;
the array substrate is arranged opposite to the quantum dot color filter substrate;
the liquid crystal layer is arranged between the quantum dot color filter substrate and the array substrate, and liquid crystal is filled in the liquid crystal layer.
The invention has the beneficial effects that: different from the situation of the prior art, the guest-host liquid crystal layer is arranged between the glass substrate and the quantum dot conversion layer, the dichroic dye in the guest-host liquid crystal layer rotates under the control of an electric field, only the light in the same direction as the dichroic dye in the guest-host liquid crystal layer is allowed to pass through, and in a dark state, the light reaching the liquid crystal conversion layer can be effectively reduced, so that the problem that the quantum dot display is yellow in the dark state is solved to a certain extent, and the service life of the quantum dot display is prolonged.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:
FIG. 1 is a schematic structural diagram of a quantum dot color filter substrate according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a quantum dot color filter substrate according to another embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a quantum dot color filter substrate according to a third embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a quantum dot color filter display panel according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a quantum dot color filter display panel according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a quantum dot color filter substrate according to an embodiment of the present invention, the substrate 100 includes:
a glass substrate 110; a quantum dot conversion layer 130 disposed on the glass substrate 110, including sequentially arranged color quantum dots; a guest-host liquid crystal layer 120 disposed between the glass substrate 110 and the quantum dot conversion layer 130, the guest-host liquid crystal layer 120 being filled with a guest-host liquid crystal mixture including liquid crystals and dichroic dyes dissolved in the liquid crystals, the dichroic dyes being rotatable with rotation of the liquid crystals under control of an external electric field.
In this embodiment, a guest-host liquid crystal layer 120 is disposed between the glass substrate 110 and the quantum dot conversion layer 130, the dichroic dye in the guest-host liquid crystal layer 120 rotates under the control of an electric field, only light in the same direction as the dichroic dye in the guest-host liquid crystal mixture is allowed to pass through, and in a dark state, the light reaching the quantum dot conversion layer 130 can be effectively reduced, so that the problem of yellow dark state of the quantum dot display can be solved to a certain extent, and the service life of the quantum dot display can be prolonged.
In this embodiment, the glass substrate 110 may also be another light-transmitting substrate, such as a resin substrate. The guest-host liquid crystal mixture filled in the guest-host liquid crystal layer 120 is encapsulated through a cell-forming process; the quantum dot conversion layer 130 includes a red quantum dot part and a green quantum dot part which are sequentially arranged. The quantum dot conversion layer 130 has a spherical shape with sequentially arranged color quantum dots, and the quantum dot portions of each color have different spherical diameters, so as to excite three primary colors and obtain a better display effect.
The guest-host liquid crystal mixture in the guest-host liquid crystal layer 120 includes liquid crystal and dichroic dye dissolved in the liquid crystal, both of which have rod-like structures, and when the liquid crystal rotates under the control of an electric field, the dichroic dye is driven to rotate together, i.e., the dichroic dye and the liquid crystal can maintain the same distribution direction. Specifically, the liquid crystal molecules in the guest-host liquid crystal mixture form an alignment in a horizontal direction, and the dichroic dye in the guest-host liquid crystal mixture is arranged in the direction of the liquid crystal molecules. That is, when the display panel is detected to be in a dark state, no electric field is applied to the guest-host liquid crystal mixture, and the long axis direction of the liquid crystal molecules in the liquid crystal and the long axis direction of the dye in the dichroic dye are both parallel to the extending direction of the glass substrate 110, at this time, the dye can effectively absorb incident light, reduce light reaching the quantum dot conversion layer 120, solve the problem that the quantum dot display is yellowish in the dark state to a certain extent, and prolong the service life of the quantum dot display. Further, when the long axis direction of the dye in the dichroic dye is parallel to the extending direction of the glass substrate 110, the same light as the long axis direction of the dye in the dichroic dye among incident light is absorbed.
In another embodiment, referring to fig. 2, fig. 2 is a schematic structural diagram of a quantum dot color filter substrate according to another embodiment of the present invention, the substrate further includes a polarization structure layer 140, and the polarization structure layer 140 includes: a bionic moth-eye structure layer (not shown) disposed on a side of the glass substrate 110 of the quantum dot color filter substrate 100 away from the guest-host liquid crystal layer 120; and a polarizer layer (not shown) disposed between the glass substrate 110 and the bionic moth-eye structure layer.
In this embodiment, the bionic moth-eye structure layer includes a plurality of columnar microstructures distributed in an array, so as to reduce light reflection and improve light penetration. Further, a polarizer layer is further included between the glass substrate 110 and the bionic moth-eye structure layer, and the polarizer layer only allows light rays in a direction perpendicular to the glass substrate 110 to enter from the light rays incident through the bionic moth-eye structure layer. That is, at this time, the direction of the light reaching the guest-host liquid crystal layer 120 is perpendicular to the long axis direction of the dye in the dichroic dye, and the light is absorbed by the dye in the dichroic dye and cannot reach the quantum dot conversion layer 130, so that the quantum dot portion in the quantum dot conversion layer 130 cannot be excited, the problem that the dark state of the quantum dot display panel is yellowish is avoided, and the service life of the quantum dot display is prolonged.
In one embodiment, the dichroic dye in the guest-host liquid crystal layer 120 may be of a plurality of colors, and absorb light of different wavelengths efficiently. Further, to enhance the handling effect on ambient light (i.e., visible light), the dichroic dye is a black pigment, which in one embodiment comprises azobenzene; the black dye may comprise 1-10%, such as 1%, 3%, 5%, 7%, 9%, or 10% of the total mass of the guest-host liquid crystal mixture, and the black dye may comprise 5% of the total mass of the guest-host liquid crystal mixture in order to ensure that the dichroic dye is efficiently driven by the liquid crystal to achieve a good light absorption effect.
Further, referring to fig. 3, fig. 3 is a schematic structural view of a third embodiment of a quantum dot color filter substrate according to the present invention, wherein the guest-host liquid crystal layer 130 further includes: oppositely arranging a first conductive film 151 and a second conductive film 152, wherein the guest-host liquid crystal mixture is filled between the first conductive film 151 and the second conductive film 152; the first conductive film 151 and the second conductive film 152 are both ITO films. In this embodiment, the electric field applied to the guest-host liquid crystal mixture may be controlled by controlling the first conductive film 151 and the second conductive film 152. In addition, the first conductive film 151 and the second conductive film 152 are respectively provided with alignment films on the sides close to the guest-host liquid crystal layer 120 for performing photo-alignment on the liquid crystal in the liquid crystal layer 200. In one embodiment, the alignment film includes polyimide, and liquid crystal is horizontally aligned. Specifically, when the display panel is in a dark state, the first conductive film 151 and the second conductive film 152 are not energized, and both the long axis direction of the liquid crystal molecules in the liquid crystal and the long axis direction of the dye in the dichroic dye are parallel to the extending direction of the glass substrate 110. When the display panel is in a bright state, the first conductive film 151 and the second conductive film 152 are energized to rotate the liquid crystal in the guest-host liquid crystal mixture and also rotate the dye in the dichroic dye, so that the long axis direction of the liquid crystal molecules in the liquid crystal and the long axis direction of the dye in the dichroic dye are perpendicular to the extending direction of the glass substrate 110, and at this time, the dichroic dye cannot absorb incident ambient light, but at this time, the quantum dot conversion layer 120 is excited, so that the display displays a color effect, and the excitation effect of the ambient light is negligible compared with that of the backlight.
In another embodiment, referring to fig. 3, the substrate further includes: a first flat layer 161 disposed between the guest-host liquid crystal layer 120 and the quantum dot conversion layer 130; a second flat layer 162 disposed on a side of the quantum dot conversion layer 130 away from the glass substrate 110; a built-in polarizer 170 disposed on a side of the second planarization layer 162 away from the glass substrate 110; a third flat layer 163 disposed on a side of the internal polarizer 170 away from the glass substrate 110; a third conductive film 153 disposed on a side of the third planarization layer 163 away from the glass substrate 110; the third conductive film 153 is an ITO film.
In order to solve the technical problem, the invention adopts another technical scheme that: a quantum dot color filter display panel is provided. Referring to fig. 4, fig. 4 is a schematic structural diagram of a quantum dot color filter display panel according to an embodiment of the present invention, the display panel includes: a quantum dot color filter substrate 100; an array substrate 200 disposed opposite to the quantum dot color filter substrate 100; and the liquid crystal layer 300 is arranged between the quantum dot color filter substrate 100 and the array substrate 200, and the liquid crystal layer 300 is filled with liquid crystal.
Wherein the quantum dot color filter substrate 100 comprises a glass substrate; a quantum dot conversion layer disposed on the glass substrate and including sequentially arranged colored quantum dots; a guest-host liquid crystal layer disposed between the glass substrate and the quantum dot conversion layer, the guest-host liquid crystal layer being filled with a guest-host liquid crystal mixture including liquid crystal and dichroic dye dissolved in the liquid crystal, the dichroic dye being rotatable with rotation of the liquid crystal under control of an external electric field; further, the substrate further includes: a polarizing structure layer, the polarizing structure layer comprising: the bionic moth-eye structure layer is arranged on one side, away from the guest host liquid crystal layer, of the glass substrate of the quantum dot color filter substrate; and the polarizer layer is arranged between the glass substrate and the bionic moth-eye structure layer. Further, the liquid crystal molecules in the guest-host liquid crystal mixture form an alignment in a horizontal direction, and the dichroic dye in the guest-host liquid crystal mixture is arranged in the direction of the liquid crystal molecules. Further, the dichroic dye is a black dye; the black dye accounts for 5% of the total mass of the guest-host liquid crystal mixture. Further, the guest-host liquid crystal layer further includes: oppositely arranging a first conductive film and a second conductive film, wherein the guest-host liquid crystal mixture is filled between the first conductive film and the second conductive film; the first conductive film and the second conductive film are both ITO films. Further, the substrate includes: a first flat layer disposed between the guest-host liquid crystal layer and the quantum dot conversion layer; the second flat layer is arranged on one side, far away from the glass substrate, of the quantum dot conversion layer; the built-in polarizer is arranged on one side, far away from the glass substrate, of the second flat layer; the third flat layer is arranged on one side, far away from the glass substrate, of the built-in polarizer; the third conductive film is arranged on one side, far away from the glass substrate, of the third flat layer; the third conductive film is an ITO film. Further, the quantum dot conversion layer includes a red quantum dot portion and a green quantum dot portion sequentially arranged. Corresponding technical details and technical advantages have been set forth above in detail and are therefore not described in detail.
In one embodiment, please refer to fig. 5, fig. 5 is a schematic structural diagram of a quantum dot color filter display panel according to another embodiment of the present invention, the display panel further includes: a lower polarizer 400 disposed on a side of the array substrate 200 away from the liquid crystal layer 300; when the quantum dot conversion layer of the quantum dot color filter substrate 100 includes a red quantum dot portion and a green quantum dot portion that are sequentially arranged, the backlight 500 of the display panel is a blue backlight. In this embodiment, the lower polarizer 400 is used to select the direction of the backlight. The blue backlight source can effectively excite the red quantum dot part and the green quantum dot part which are sequentially arranged, and the display effect is further improved.
In one embodiment, when the liquid crystal molecules in the guest-host liquid crystal mixture are aligned in a horizontal direction and the dichroic dye is aligned in the direction of the liquid crystal molecules, the external electric field is not applied to the guest-host liquid crystal layer if the dark state of the display panel is detected, and the external electric field is applied to the guest-host liquid crystal layer if the light state of the display panel is detected. That is, in order to prevent the quantum dot conversion layer from being excited by the incident of ambient light, the liquid crystal molecules in the guest-host liquid crystal mixture form an alignment in a horizontal direction in a dark state, and the dichroic dye is arranged in the direction of the liquid crystal molecules to absorb the incident light. And when the light source is in a bright state, the light emitted by the blue backlight source can excite the quantum dot conversion layer to enable the light emitting efficiency of the quantum dot conversion layer to be maximum, at the moment, the light generated by excitation passes through the display panel, and at the moment, the incident of ambient light cannot cause negative influence on the display effect.
In summary, the present invention discloses a quantum dot color filter substrate and a display panel, wherein the substrate comprises: a glass substrate; a quantum dot conversion layer disposed on the glass substrate and including sequentially arranged colored quantum dots; a guest-host liquid crystal layer disposed between the glass substrate and the quantum dot conversion layer, the guest-host liquid crystal layer being filled with a guest-host liquid crystal mixture including liquid crystal and dichroic dye dissolved in the liquid crystal, the dichroic dye being rotatable with rotation of the liquid crystal under control of an external electric field. Through the mode, the problem that the quantum dot display is yellow in dark state can be solved to a certain extent, and the service life of the quantum dot display is prolonged.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A quantum dot color filter substrate, comprising:
a glass substrate;
a quantum dot conversion layer disposed on the glass substrate and including sequentially arranged colored quantum dots;
and the guest-host liquid crystal layer is arranged between the glass substrate and the quantum dot conversion layer and is filled with a guest-host liquid crystal mixture, the guest-host liquid crystal mixture comprises liquid crystal and dichroic dye dissolved in the liquid crystal, and the dichroic dye can rotate along with the rotation of the liquid crystal under the control of an external electric field so as to align the dichroic dye and reduce light reaching the quantum dot conversion layer.
2. The substrate of claim 1, further comprising: a polarizing structure layer, the polarizing structure layer comprising:
the bionic moth-eye structure layer is arranged on one side, away from the guest host liquid crystal layer, of the glass substrate of the quantum dot color filter substrate;
and the polarizer layer is arranged between the glass substrate and the bionic moth-eye structure layer.
3. The substrate of claim 1, wherein the liquid crystal molecules in the guest-host liquid crystal mixture form an alignment in a horizontal direction, and the dichroic dye in the guest-host liquid crystal mixture is aligned in the direction of the liquid crystal molecules.
4. The substrate of claim 1, wherein the dichroic dye is a black dye; the black dye accounts for 5% of the total mass of the guest-host liquid crystal mixture.
5. The substrate of claim 1, wherein the guest-host liquid crystal layer further comprises: oppositely arranging a first conductive film and a second conductive film, wherein the guest-host liquid crystal mixture is filled between the first conductive film and the second conductive film; the first conductive film and the second conductive film are both ITO films.
6. The substrate according to claim 1, wherein the substrate comprises:
a first flat layer disposed between the guest-host liquid crystal layer and the quantum dot conversion layer;
the second flat layer is arranged on one side, far away from the glass substrate, of the quantum dot conversion layer;
the built-in polarizer is arranged on one side, far away from the glass substrate, of the second flat layer;
the third flat layer is arranged on one side, far away from the glass substrate, of the built-in polarizer;
the third conductive film is arranged on one side, far away from the glass substrate, of the third flat layer; the third conductive film is an ITO film.
7. The substrate of claim 1, wherein the quantum dot conversion layer comprises a red quantum dot portion and a green quantum dot portion sequentially arranged.
8. A quantum dot color filter display panel, comprising:
a quantum dot color filter substrate comprising the quantum dot color filter substrate of any one of claims 1-7;
the array substrate is arranged opposite to the quantum dot color filter substrate;
the liquid crystal layer is arranged between the quantum dot color filter substrate and the array substrate, and liquid crystal is filled in the liquid crystal layer.
9. The display panel according to claim 8, characterized in that the display panel further comprises: the lower polarizer is arranged on one side of the array substrate, which is far away from the liquid crystal layer; when the quantum dot conversion layer of the quantum dot color filter substrate comprises a red quantum dot part and a green quantum dot part which are sequentially arranged, the backlight source of the display panel is a blue backlight source.
10. The display panel of claim 8, wherein when the liquid crystal molecules in the guest-host liquid crystal mixture are aligned in a horizontal direction and the dichroic dye is aligned in the direction of the liquid crystal molecules, the guest-host liquid crystal layer is not applied with an external electric field if the dark state of the display panel is detected and the guest-host liquid crystal layer is applied with an external electric field if the bright state of the display panel is detected.
CN201811019422.8A 2018-09-03 2018-09-03 Quantum dot color filter substrate and display panel Active CN109143662B (en)

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CN113219714B (en) * 2021-05-10 2023-08-25 Oppo广东移动通信有限公司 Polarizer, liquid crystal display module and electronic equipment

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