CN108594514A - A kind of display panel and the display device with it - Google Patents
A kind of display panel and the display device with it Download PDFInfo
- Publication number
- CN108594514A CN108594514A CN201810400727.7A CN201810400727A CN108594514A CN 108594514 A CN108594514 A CN 108594514A CN 201810400727 A CN201810400727 A CN 201810400727A CN 108594514 A CN108594514 A CN 108594514A
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- Prior art keywords
- display panel
- electrode
- material layer
- reflectance coating
- light control
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL 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
- G02F1/00—Devices 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
- G02F1/01—Devices 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
- G02F1/13—Devices 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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1339—Gaskets; Spacers; Sealing of cells
- G02F1/13394—Gaskets; Spacers; Sealing of cells spacers regularly patterned on the cell subtrate, e.g. walls, pillars
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL 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
- G02F1/00—Devices 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
- G02F1/01—Devices 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
- G02F1/13—Devices 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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133553—Reflecting elements
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL 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
- G02F1/00—Devices 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
- G02F1/01—Devices 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
- G02F1/13—Devices 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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Geometry (AREA)
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The present invention provides a kind of display panel and the display device with it, and display panel includes the color membrane substrates being oppositely arranged and array substrate, and the liquid crystal layer between the color membrane substrates and the array substrate, and the display panel further includes：Reflectance coating, the reflectance coating are sticked in the color membrane substrates backwards to the side of the liquid crystal layer；Multiple spacers, multiple spacers are spaced to be opened between the array substrate and the color membrane substrates successively reaches peep-proof purpose for absorbing light；Two-dimentional light control material layer, the two dimension light control material layer is located at the reflectance coating backwards to the side of the color membrane substrates, the two dimension light control material layer can be deflected with electric field change to adjust peep-proof angle, and the light of the two dimension light control material layer reflection can increase the light transmittance and visible angle of the display panel through reflectance coating reflection.Not only can be with peep-proof according to the display panel of inventive embodiments, but also it will not sacrificing luminance.
Description
Technical field
The present invention relates to technical field of liquid crystal display, are filled more particularly, to a kind of display panel and with its display
It sets.
Background technology
General peep-proof display part, in order to reach good peep-proof effect, usually can all sacrifice one when showing picture
Fixed brightness, and it is unable to reach the display effect of adjustable angle.
Invention content
The technical problem to be solved in the present invention is to provide a kind of display panel and with its display device.
In order to solve the above technical problems, the embodiment of the present invention offer technical solution is as follows：
The display panel of embodiment includes the color membrane substrates being oppositely arranged and array substrate according to a first aspect of the present invention, with
And the liquid crystal layer between the color membrane substrates and the array substrate, the display panel further include：
Reflectance coating, the reflectance coating are sticked in the color membrane substrates backwards to the side of the liquid crystal layer；
Multiple spacers, multiple spacers are spaced successively to be opened between the array substrate and the color membrane substrates
Reach peep-proof purpose for absorbing light；
Two-dimentional light control material layer, the two dimension light control material layer are located at the reflectance coating backwards to the one of the color membrane substrates
Side, the two dimension light control material layer can be deflected with electric field change to adjust peep-proof angle, the two dimension light control material layer
The light of reflection can increase the light transmittance and visible angle of the display panel through reflectance coating reflection.
Further, the display panel further includes：
First electrode, the first electrode are located at the two-dimentional light control material layer on the side of the reflectance coating；
Second electrode, the second electrode are sticked the reflectance coating backwards to the side of the color membrane substrates and positioned at described anti-
It penetrates between film and the two-dimentional light control material layer, the second electrode adjusts electric field with first electrode cooperation.
Further, the first electrode is transparent material materials and parts, and the first electrode is formed as planar and is covered in described
On two-dimentional light control material layer, the second electrode is formed as multiple bulks, multiple second electrodes successively it is arranged spaced apart
So that the two dimension light control material layer deflects and coordinates the reflectance coating reflection light to improve light on the reflectance coating
Transmitance.
Further, the first electrode uses tin indium oxide with the second electrode.
Further, the display panel further includes：Encapsulation cover plate, the encapsulation cover plate are located at the first electrode back of the body
To the side of the color membrane substrates, the first electrode is located on the encapsulation cover plate.
Further, the display panel further includes：Multiple support elements, multiple support elements are spaced successively to be opened in
To support the encapsulation cover plate between the encapsulation cover plate and the color membrane substrates.
Further, the absorbance of the spacer is more than 4.
Further, the thickness of the two-dimentional light control material layer is 2um-5um.
Further, the two-dimentional light control material layer is graphene oxide composite material part.
Further, the reflectance coating is alternately formed by stacking by least two film layers, and the film layer is towards institute
The refractive index stated in color membrane substrates direction continuously decreases.
On the other hand, a kind of display device with the display panel is provided.
The embodiment of the present invention has the advantages that：
In said program, certain light is absorbed by spacer, two-dimentional light control material layer with electric field change deflect with
Peep-proof angle is adjusted, meanwhile, light transmittance and visible angle can be turned up by being matched with two-dimentional light control material layer by reflectance coating,
That is the display panel not only can be with peep-proof, but also it will not sacrificing luminance.
Description of the drawings
Fig. 1 is a structural schematic diagram according to display panel in the embodiment of the present invention；
Fig. 2 is a structural schematic diagram according to the spacer of display panel in the embodiment of the present invention；
Fig. 3 is the sectional view of Fig. 2 center lines M-M；
Fig. 4 is the sectional view of Fig. 2 center lines N-N；
Fig. 5 is another structural schematic diagram according to the spacer of display panel in the embodiment of the present invention；
Fig. 6 is the sectional view of Fig. 5 center lines P-P；
Fig. 7 is the sectional view of Fig. 5 center lines Q-Q；
Fig. 8 is the internal structure schematic diagram according to the two-dimentional light control material layer of display panel in the embodiment of the present invention；
Fig. 9 is to be shown by a structure of electric field action according to the two-dimentional light control material layer of display panel in the embodiment of the present invention
It is intended to；
Figure 10 is another knot according to the two-dimentional light control material layer of display panel in the embodiment of the present invention by electric field action
Structure schematic diagram.
Reference numeral：
Display panel 100；
Array substrate 10；First electrode 11；Second electrode 12；
Color membrane substrates 20；
Liquid crystal layer 30；
Reflectance coating 40；
Two-dimentional light control material layer 50；
Spacer 60；
Encapsulation cover plate 70；
Support element 80.
Specific implementation mode
To keep the embodiment of the present invention technical problems to be solved, technical solution and advantage clearer, below in conjunction with
Drawings and the specific embodiments are described in detail.
The embodiment of the present invention can sacrifice display panel brightness for display panel in the prior art in peep-proof design
Problem provides a kind of display panel 100.
As shown in Figures 1 to 8, display panel 100 includes the color membrane substrates 20 being oppositely arranged and array substrate 10, Yi Jiwei
Liquid crystal layer 30 between color membrane substrates 20 and array substrate 10, display panel 100 further include reflectance coating 40, multiple spacers
60 and two-dimentional light control material layer 50.
Specifically, reflectance coating 40 is sticked in color membrane substrates 20 backwards to the side of liquid crystal layer 30, multiple spacers 60 are successively
Interval is opened between array substrate 10 and color membrane substrates 20 reaches peep-proof purpose, two-dimentional light control material layer for absorbing light
50 are located at the side of 40 color membrane substrates 20 of reflectance coating, and two-dimentional light control material layer 50 can be deflected with electric field change to adjust
Peep-proof angle is saved, i.e., peep-proof effect is realized by the adjusting of visible angle, is had during realizing peep-proof certain saturating
Rate loss is crossed, but the light outside visible angle range can be reflected into reflectance coating 40, two-dimentional light control material by two-dimentional light control material layer 50
Layer 50 reflection light through reflectance coating 40 reflect and scatter can be utilized again, can increase display panel 100 light transmittance and
Visible angle.
It should be noted that color membrane substrates 20 are located at the side of array substrate 10 and are spaced apart with array substrate 10, liquid crystal
Layer 30 is located between array substrate 10 and color membrane substrates 20, reflectance coating 40 be sticked in color membrane substrates 20 backwards to liquid crystal layer 30 one
Side, multiple spacers 60 are located at interval between array substrate 10 and color membrane substrates 20, as shown in Figures 2 to 7, spacer 60
Have the effect of that stronger absorbing ability can reach certain peep-proof, meanwhile, patterned spacer 60 can also prevent from showing
Show 100 warpage of panel, ensure that the homogeneity of 100 front face brightness of display panel, two-dimentional light control material layer 50 is in vertical electric field
In the state of complete light transmission to reach preferable display effect, with the change of electric field, two-dimentional 50 internal structure of light control material layer
It is deflected from vertical state to horizontal direction, since there is certain reflex, two dimension to adjust on the surface of two-dimentional light control material layer 50
The light that optical material layer 50 reflects reflects the visible angle and light transmittance for increasing display device 100 through reflectance coating 40, that is,
Say, change can angles of display in the case of, the display effect at positive visual angle will not be influenced.
As a result, according to the display panel of inventive embodiments 100, certain light, two dimension light modulation material are absorbed by spacer 60
The bed of material 50 is deflected with electric field change to adjust peep-proof angle, meanwhile, pass through reflectance coating 40 and two-dimentional 50 phase of light control material layer
Light transmittance and visible angle can be turned up in cooperation, that is to say, that the display panel 100 not only can be with peep-proof, but also will not sacrificing luminance.
Some specific embodiments according to the present invention, display panel 100 further include first electrode 11 and second electrode 12.
Specifically, first electrode 11 is located on the side of 50 back-reflection film 40 of two-dimentional light control material layer, second electrode 12
It is sticked in the side of 40 color membrane substrates 20 of reflectance coating and between reflectance coating 40 and two-dimentional light control material layer 50, the second electricity
Pole 12 adjusts electric field so that two-dimentional light control material layer 50 deflects and coordinates 40 reflected light of reflectance coating with the cooperation of first electrode 11
Line is to improve light penetration.
Specifically, second electrode 12 adjusts electric field so that two-dimentional light control material layer 50 occurs partially with the cooperation of first electrode 11
Turn, the two-dimentional light control material layer 50 under electric field action is matched with reflectance coating 40 can improve light penetration, and positive visual angle can be by
Light transmittance is reduced in the reflection of two-dimentional light control material layer 50, but light transmittance can be further increased by reflectance coating 40, that is,
Say, though change can angles of display in the case of, the display effect at positive visual angle will not be influenced.
Preferably, first electrode 11 is transparent material materials and parts, and first electrode 11 is formed as planar and is covered in two dimension light modulation material
On the bed of material 50, second electrode 12 is formed as multiple bulks, and multiple second electrodes 12 are arranged spaced apart on reflectance coating 40 successively.
That is, first electrode 11 can be transparent material part can also select other materials part as the case may be,
Transparent 11 translucency of first electrode is good, and second electrode 12 is formed as multiple bulks, first electrode 11 and 12 structure of second electrode
Simply, it is easily installed and uses.
According to one embodiment of present invention, first electrode 11 uses tin indium oxide (Indium tin with second electrode 12
Oxide, ITO) etc. material pieces, tin indium oxide be transparent conductive material.
According to still another embodiment of the invention, display panel 100 further includes encapsulation cover plate 70, and encapsulation cover plate 70 is located at the
The side of one electrode, 11 color membrane substrates 20, first electrode 11 are located on encapsulation cover plate 70, and wherein encapsulation cover plate 70 can be
Glass cover-plate, glass cover-plate translucency are good.
Preferably, display panel 100 further includes multiple support elements 80, and multiple support elements 80 are spaced are opened in cap successively
To support encapsulation cover plate 70, support element 80 to keep 100 structure of display panel more firm between plate 70 and color membrane substrates 20.
According to one embodiment of present invention, the absorbance of spacer 60 is more than 4, when visual angle is larger, display panel 100
Transmitance continuously decreases, and can realize peep-proof effect.
In one embodiment of the invention, the thickness of two-dimentional light control material layer 50 is 2um-5um, and the two dimension of the thickness is adjusted
50 using effect of optical material layer is good.
Optionally, two-dimentional light control material layer 50 is graphene oxide composite material part.
Specifically, as shown in figure 8, graphene oxide internal structure is influenced the direction of meeting arrow C meanings along figure by electric field
Deflection, as shown in Figure 9 and Figure 10, with not same electric field, (A arrows and B arrows indicate not same electric field to graphene oxide respectively in figure
Direction) after deflection, display area can be increased, reflectance coating 40 can increase the brightness of visible area, promote display effect, work as graphite oxide
After alkene is deflected with vertical electric field, graphene oxide is in fully transparent state in vertical direction, when graphene oxide as electric field occurs
It, can be by reflecting up to the adjusting of visible angle after deflection, and reflectance coating 40 of arranging in pairs or groups promotes transmitance.
According to one embodiment of present invention, reflectance coating 40 is alternately formed by stacking by least two film layers, and film layer
It is continuously decreased towards the refractive index in 20 direction of color membrane substrates, specifically, reflectance coating 40 can make by N layers of refractive index
Alternately (wherein N is made in superposition to two kinds of material film layers from high to low>1) it is, that (λ is wave for λ/4 per the optical thickness of layer film layer
It is long).
Further, display panel 100 according to the ... of the embodiment of the present invention at work, to about 50 two-dimentional light control material layer
Electrode apply different voltage, form vertical electric field, two-dimentional light control material layer 50 is arranged along direction of an electric field, is in vertical direction
The now state of complete light transmission, and then reach display effect, it should be noted that as shown in figure 9, the light that display panel 100 is emitted
Reflectance coating 40 can be passed through by learning, and be then emitted using two-dimentional light control material layer 50.
When keep 11 signal of first electrode it is constant, to 20 back side second electrode 12 of color membrane substrates apply different voltages when, with
Voltage difference increase, two-dimentional light control material layer 50 is deflected from vertical state to horizontal direction, due to two-dimentional 50 table of light control material layer
Face has certain reflex, the reflectance coating 40 above color membrane substrates 20 of arranging in pairs or groups, and then increases the angle of visibility of display panel 100
Degree.Although also, positive visual angle can reduce light transmittance due to the reflection of two-dimentional light control material layer 50, pass through color membrane substrates 20
Reflectance coating 40 can further increase light transmittance, as shown in Figure 10, change can angles of display in the case of, will not influence to face
The display effect at angle.
To sum up, according to the display panel 100 of inventive embodiments, certain light is absorbed by spacer 60, two dimension is adjusted
Optical material layer 50 is deflected with electric field change to adjust peep-proof angle, meanwhile, pass through reflectance coating 40 and two-dimentional light control material layer
50 match light transmittance and visible angle can be turned up, that is to say, that the display panel 100 not only can be with peep-proof, but also will not sacrifice
Brightness.
The embodiment of the present invention additionally provides a kind of display device with the display panel 100, due to according in the present invention
The display panel 100 for stating embodiment has above-mentioned technique effect, and therefore, display device according to the ... of the embodiment of the present invention also has phase
The technique effect answered, not only can be with peep-proof, but also will not sacrificing luminance.
The composition of display device according to the ... of the embodiment of the present invention and operation are that can manage to those skilled in the art
It solves and easy to implement, therefore is not described in detail.
In each method embodiment of the present invention, the priority that the serial number of each step can not be used to limit each step is suitable
Sequence without creative efforts, changes the priority of each step for those of ordinary skill in the art
Within protection scope of the present invention.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of display panel, including the color membrane substrates and array substrate that are oppositely arranged, and it is located at the color membrane substrates and institute
State the liquid crystal layer between array substrate, which is characterized in that the display panel further includes：
Reflectance coating, the reflectance coating are sticked in the color membrane substrates backwards to the side of the liquid crystal layer；
Multiple spacers, multiple spacers be spaced successively be opened between the array substrate and the color membrane substrates with
Reach peep-proof purpose in absorbing light；
Two-dimentional light control material layer, the two dimension light control material layer are located at the reflectance coating backwards to the side of the color membrane substrates, institute
Stating two-dimentional light control material layer can deflect with electric field change to adjust peep-proof angle, the two dimension light control material layer reflection
Light can increase the light transmittance and visible angle of the display panel through reflectance coating reflection.
2. display panel according to claim 1, which is characterized in that further include：
First electrode, the first electrode are located at the two-dimentional light control material layer on the side of the reflectance coating；
Second electrode, the second electrode are sticked the reflectance coating backwards to the side of the color membrane substrates and are located at the reflectance coating
Between the two-dimentional light control material layer, the second electrode adjusts electric field so that the two dimension is adjusted with first electrode cooperation
Optical material layer deflects and coordinates the reflectance coating reflection light to improve light penetration.
3. display panel according to claim 2, which is characterized in that the first electrode is transparent material materials and parts, described the
One electrode is formed as planar and is covered on the two-dimentional light control material layer, and the second electrode is formed as multiple bulks, multiple
The second electrode is arranged spaced apart on the reflectance coating successively.
4. display panel according to claim 2, which is characterized in that the first electrode uses oxygen with the second electrode
Change indium tin.
5. display panel according to claim 2, which is characterized in that further include：
Encapsulation cover plate, the encapsulation cover plate are located at the first electrode backwards to the side of the color membrane substrates, the first electrode
On the encapsulation cover plate.
6. display panel according to claim 5, which is characterized in that further include：
Multiple support elements, multiple support elements are spaced successively to be opened between the encapsulation cover plate and the color membrane substrates to prop up
Support the encapsulation cover plate.
7. display panel according to claim 1, which is characterized in that the thickness of the two dimension light control material layer is 2um-
5um。
8. display panel according to claim 1, which is characterized in that the two dimension light control material layer is graphene oxide material
Materials and parts.
9. display panel according to claim 1, which is characterized in that the reflectance coating is alternately folded by least two film layers
Add, and the film layer is continuously decreased towards the refractive index in the color membrane substrates direction.
10. a kind of display device, which is characterized in that including the display panel described in any one of claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810400727.7A CN108594514B (en) | 2018-04-28 | 2018-04-28 | Display panel and display device with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810400727.7A CN108594514B (en) | 2018-04-28 | 2018-04-28 | Display panel and display device with same |
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| Publication Number | Publication Date |
|---|---|
| CN108594514A true CN108594514A (en) | 2018-09-28 |
| CN108594514B CN108594514B (en) | 2020-12-01 |
Family
ID=63619192
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810400727.7A Active CN108594514B (en) | 2018-04-28 | 2018-04-28 | Display panel and display device with same |
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| Country | Link |
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| CN (1) | CN108594514B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109375388A (en) * | 2018-10-31 | 2019-02-22 | 京东方科技集团股份有限公司 | Light control structure, display device and working method |
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| CN105467655A (en) * | 2015-12-10 | 2016-04-06 | 昆山龙腾光电有限公司 | Display assembly, display device, and manufacturing method |
| CN105607315A (en) * | 2016-03-17 | 2016-05-25 | 深圳市锐丽创科技有限公司 | Display module and convertible peeping preventing displayer |
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| JPH10197844A (en) * | 1997-01-09 | 1998-07-31 | Sharp Corp | Liquid crystal display device |
| US20080284715A1 (en) * | 2007-05-17 | 2008-11-20 | Yasushi Kawata | Display device |
| CN103323970A (en) * | 2013-06-20 | 2013-09-25 | 京东方科技集团股份有限公司 | Display panel, preparation method of display panel and display device |
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| CN105607315A (en) * | 2016-03-17 | 2016-05-25 | 深圳市锐丽创科技有限公司 | Display module and convertible peeping preventing displayer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109375388A (en) * | 2018-10-31 | 2019-02-22 | 京东方科技集团股份有限公司 | Light control structure, display device and working method |
| CN109375388B (en) * | 2018-10-31 | 2022-06-17 | 京东方科技集团股份有限公司 | Light control structure, display device and working method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108594514B (en) | 2020-12-01 |
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