CN109215596A - The method, apparatus and display panel of adjust automatically overdrive voltage - Google Patents
The method, apparatus and display panel of adjust automatically overdrive voltage Download PDFInfo
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- CN109215596A CN109215596A CN201811187629.6A CN201811187629A CN109215596A CN 109215596 A CN109215596 A CN 109215596A CN 201811187629 A CN201811187629 A CN 201811187629A CN 109215596 A CN109215596 A CN 109215596A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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Abstract
The present invention provides a kind of method and apparatus of adjust automatically overdrive voltage, which comprises carries out blank level adjustment to display panel；Light the corresponding pure color picture of red pixel under different grayscale；Calculate the corresponding red smear distance of red pixel under different grayscale, overdrive voltage of the overdrive voltage that the smallest red smear of selection includes in corresponding grayscale signal as red pixel；Light the corresponding pure color picture of green pixel under different grayscale；Calculate the corresponding green smear distance of green pixel under different grayscale, overdrive voltage of the overdrive voltage that the smallest green smear of selection includes in corresponding grayscale signal as green pixel；Light the corresponding pure color picture of blue pixel point under different grayscale；Calculate the corresponding blue smear distance of blue pixel point under different grayscale, overdrive voltage of the overdrive voltage that the smallest blue smear of selection includes in corresponding grayscale signal as blue pixel point.
Description
Technical field
The present invention relates to field of electronic display more particularly to a kind of method, apparatus of adjust automatically overdrive voltage and show
Show panel.
Background technique
Thin Film Transistor-LCD (TFT-LCD) is aobvious compared with cathode-ray picture tube (Cathode Ray Tube, CRT)
Show that device has many good qualities, including small in size, high resolution, power consumption it is low, it is light-weight and without radiation etc., therefore TV,
Computer and other mobile communication fields are widely used.But LCD display is when showing quick moving image, due to liquid crystal
Response time it is longer, LCD will appear edge blurry or motion blur phenomenon, and picture is unclear, reduce user experience.
(Over Driving, OD) technology of overdriving is exactly a kind of new skill that can effectively improve liquid crystal gray scale response speed
Art is more than expected voltage by applying at liquid crystal capacitance both ends, is accelerated the rotary course of liquid crystal molecule using strong electrical field, with
This reduces the response time of liquid crystal.
Since the gray scale color of LCD can change with the variation of driving voltage, so blank level adjustment need to be used.But
Under white balance situation, since the corresponding voltage of different pixels color is different, if using identical voltage, it can be due to different pixels
The smear degree of color is different and leads to the problem of and drags color.Therefore, it is necessary to carry out manual debugging one by one to each pixel, determined
Driving voltage, this process time-consuming is long, at high cost, low efficiency.
Summary of the invention
The present invention provides the method, apparatus and display panel of a kind of adjust automatically overdrive voltage, to solve the prior art
Middle overdrive voltage can not adjust automatically the technical issues of.
To solve the above problems, technical solution provided by the invention is as follows:
A kind of method of adjust automatically overdrive voltage comprising following steps:
Blank level adjustment is carried out to display panel；
Light the corresponding pure color picture of red pixel under different grayscale；
Calculate the corresponding red smear distance of red pixel under different grayscale；
Compare the corresponding red smear distance of red pixel under different grayscale, it is corresponding to choose the smallest red smear distance
Grayscale signal in include overdrive voltage of the overdrive voltage as red pixel；
Light the corresponding pure color picture of green pixel under different grayscale；
Calculate the corresponding green smear distance of green pixel under different grayscale；
Compare the corresponding green smear distance of green pixel under different grayscale, it is corresponding to choose the smallest green smear distance
Grayscale signal in include overdrive voltage of the overdrive voltage as green pixel；
Light the corresponding pure color picture of blue pixel point under different grayscale；
Calculate the corresponding blue smear distance of blue pixel point under different grayscale；
Compare the corresponding blue smear distance of blue pixel point under different grayscale, it is corresponding to choose the smallest blue smear distance
Grayscale signal in include overdrive voltage of the overdrive voltage as blue pixel point.
The specific embodiment provided according to the present invention, wherein calculating the corresponding red of red pixel under different grayscale
The method of smear distance are as follows:
Input moving image, the grayscale of the mobile image are less than the grayscale of present display panel；
Shoot the display panel photo of any moment in image moving process；
Analysis obtain display panel on different zones grayscale value, wherein mobile image also without region grayscale
Value is equal to the grayscale value in the region that mobile image has already passed through, and is the first grayscale, the grayscale of mobile image region is second
Grayscale, the second grayscale less than the first grayscale, the grayscale in smear region be third grayscale, the third grayscale be greater than the second grayscale and
Not equal to the first grayscale；
Smear region is measured along the length of image moving direction, which is smear distance.
The specific embodiment provided according to the present invention, wherein calculating the corresponding green of green pixel under different grayscale
The method of smear distance and the method ash different from calculating for calculating the corresponding blue smear distance of blue pixel point under different grayscale
The method of the corresponding red smear distance of red pixel is identical under rank.
The specific embodiment provided according to the present invention, wherein the mobile image of the input is rectangle, the rectangle
Moving direction it is parallel with a line of display panel.
The specific embodiment provided according to the present invention, wherein before carrying out blank level adjustment, further includes:
Gamma adjustment is carried out to display panel.
Correspondingly, the present invention also provides a kind of devices of adjust automatically overdrive voltage comprising:
The first adjustment unit, for carrying out blank level adjustment to display panel；
First control unit, for lighting the corresponding pure color picture of red pixel under different grayscale；
First computing unit, for calculating the corresponding red smear distance of red pixel under different grayscale；
First comparing unit is chosen minimum for the corresponding red smear distance of red pixel under more different grayscale
Red smear overdrive voltage of the overdrive voltage as red pixel that includes in corresponding grayscale signal；
Second control unit lights the corresponding pure color picture of green pixel under different grayscale；
Second computing unit calculates the corresponding green smear distance of green pixel under different grayscale；
Second comparing unit, the corresponding green smear distance of green pixel, chooses the smallest green under more different grayscale
Overdrive voltage of the overdrive voltage that color smear includes in corresponding grayscale signal as green pixel；
Third control unit lights the corresponding pure color picture of blue pixel point under different grayscale；
Third computing unit calculates the corresponding blue smear distance of blue pixel point under different grayscale；
Third comparing unit, the corresponding blue smear distance of blue pixel point, chooses the smallest indigo plant under more different grayscale
Overdrive voltage of the overdrive voltage that color smear includes in corresponding grayscale signal as blue pixel point.
The specific embodiment provided according to the present invention, wherein the first computing unit includes:
Input module, is used for input moving image, and the grayscale of the mobile image is less than the grayscale of present display panel；
Shooting module, for shooting the display panel photo of any moment in image moving process；
Analysis module, for analyze obtain display panel on different zones grayscale value, wherein mobile image also without
The grayscale value in region be equal to the grayscale value in region that mobile image has already passed through, be the first grayscale, mobile image region
Grayscale be the second grayscale, the second grayscale is third grayscale less than the first grayscale, the grayscale in smear region, and the third grayscale is big
In the second grayscale and it is not equal to the first grayscale；
Measurement module, for measuring smear region along the length of image moving direction, which is smear distance.
The specific embodiment provided according to the present invention, wherein second computing unit and third computing unit and
The structure of one computing unit is identical.
The specific embodiment provided according to the present invention, wherein the mobile image of the input is rectangle, the rectangle
Moving direction it is parallel with a line of display panel.
The specific embodiment provided according to the present invention, the device of adjust automatically overdrive voltage further include:
Second adjustment unit, for carrying out gamma adjustment to display panel.
Correspondingly, the display panel includes foregoing adjust automatically the present invention also provides a kind of display panel
The device of overdrive voltage.
The present invention carries out blank level adjustment to display panel first, and it is corresponding to light different pixels point under different grayscale later
Pure color picture calculates the corresponding red smear distance of different pixels point under different grayscale, and chooses the smallest smear apart from right
Overdrive voltage of the overdrive voltage for including in the grayscale signal answered as different pixels point, to realize overdrive voltage
It manually adjusts, is effectively saved cost, improve efficiency.
Detailed description of the invention
Fig. 1 is the flow chart of the method for the adjust automatically overdrive voltage in one embodiment of the present of invention；
Fig. 2 is the relational graph between driving signal in the prior art and the brightness of display panel；
Fig. 3 is the schematic diagram for the smear that the driving signal in Fig. 2 generates on a display panel；
Fig. 4 is the relational graph in the prior art overdrived between signal and the brightness of display panel；
Fig. 5 is the method explanatory diagram of the calculating smear distance in one embodiment of the present of invention.
Specific embodiment
It should be mentioned that some exemplary embodiments are described as before exemplary embodiment is discussed in greater detail
The processing or method described as flow chart.Although operations are described as the processing of sequence by flow chart, therein to be permitted
Multioperation can be implemented concurrently, concomitantly or simultaneously.In addition, the sequence of operations can be rearranged.Also answer
When should be mentioned that, in some replace implementations, the function action being previously mentioned can be suitable according to being different from indicating in attached drawing
Sequence occurs.For example, related function action is depended on, the two width figures shown in succession can actually be substantially simultaneously
It executes or can execute in a reverse order sometimes.
Method (some of them are illustrated by process) discussed hereafter can be by hardware, software, firmware, centre
Part, microcode, hardware description language or any combination thereof are implemented.Implement when with software, firmware, middleware or microcode
When, program code or code segment to implement necessary task can be stored in machine or computer-readable medium and (for example deposit
Storage media) in.Necessary task can be implemented in (one or more) processor.
Specific structure and function details disclosed herein are only representative, and are for describing showing for the application
The purpose of example property embodiment.But the application can be implemented by many alternative forms, and be not interpreted as
It is limited only by the embodiments set forth herein.
Although it should be understood that may have been used term " first ", " second " etc. herein to describe each unit,
But these units should not be limited by these terms.The use of these items is only for by a unit and another unit
It distinguishes.For example, without departing substantially from the range of exemplary embodiment, it is single that first unit can be referred to as second
Member, and similarly second unit can be referred to as first unit.Term "and/or" used herein above include one of them or
Any and all combinations of more listed associated items.
The liquid crystal response time is each pixel of panel to applied alive reaction speed, i.e., pixel is from bright to dark or from dark
To bright, the voltage of application is from high level to low level or voltage is converted from low level to high level, the time required for converting,
Principle is that liquid crystal cells are affected by the applied voltage, liquid crystal molecule torsion and reply.The liquid crystal response time is shorter, then user is just
It more can be appreciated that smooth fluent dynamic menu, not can be appreciated that phenomena such as color ghost is dragged in hangover.Referring to fig. 2, Fig. 2 is in the prior art
Driving signal and display panel brightness between relational graph, it can be seen that since the time of liquid crystal response is longer, gate close
When closing, brightness is also unsaturated, will lead to dynamic menu and generates smear, as shown in Figure 3.
By that can improve this phenomenon using overdrive technique, principle is to apply at liquid crystal capacitance both ends more than expection
Voltage, accelerate the rotary course of liquid crystal molecule using strong electrical field, the liquid crystal response time reduced with this.But if OD voltage is too
Greatly, brightness be more than saturation region after restore again, can equally the response time be made to become larger, as shown in Figure 4, it is therefore desirable to OD voltage carry out
Debugging.Since the gray scale color of LCD can change with the variation of driving voltage, so blank level adjustment need to be used.But white
Under equilibrium condition, since the corresponding voltage of different pixels color is different, if using identical voltage, it can be due to different pixels face
The smear degree of color is different and leads to the problem of and drags color.Therefore, it is necessary to carry out manual debugging one by one to each pixel, drive was determined
Dynamic voltage, this process time-consuming is long, at high cost, low efficiency.
Referring to Fig. 1, the present invention provides a kind of methods of adjust automatically overdrive voltage, specifically, the method includes
Following steps:
Blank level adjustment is carried out to display panel；
Light the corresponding pure color picture of red pixel under different grayscale；
Calculate the corresponding red smear distance of red pixel under different grayscale；
Compare the corresponding red smear distance of red pixel under different grayscale, it is corresponding to choose the smallest red smear distance
Grayscale signal in include overdrive voltage of the overdrive voltage as red pixel；
Light the corresponding pure color picture of green pixel under different grayscale；
Calculate the corresponding green smear distance of green pixel under different grayscale；
Compare the corresponding green smear distance of green pixel under different grayscale, it is corresponding to choose the smallest green smear distance
Grayscale signal in include overdrive voltage of the overdrive voltage as green pixel；
Light the corresponding pure color picture of blue pixel point under different grayscale；
Calculate the corresponding blue smear distance of blue pixel point under different grayscale；
Compare the corresponding blue smear distance of blue pixel point under different grayscale, it is corresponding to choose the smallest blue smear distance
Grayscale signal in include overdrive voltage of the overdrive voltage as blue pixel point.
It should be noted that the sequence of above-mentioned steps is used only for illustratively illustrating the present invention, operations in practice
Sequence can be rearranged.For example, in other embodiments of the invention, the minimum smear of blue light can first be calculated
Distance, then successively calculate the minimum smear distance of feux rouges and green light.Or the minimum smear distance of green light can also be first calculated, then
Successively calculate the minimum smear distance of blue light and feux rouges.Color sequences should not be construed as limitation of the present invention.
Preferably, the method for the corresponding red smear distance of red pixel under different grayscale is calculated are as follows: the mobile figure of input
Picture, the grayscale of the mobile image are less than the grayscale of present display panel；Shooting in image moving process any moment it is aobvious
Show panel photo；Analysis obtain display panel on different zones grayscale value, wherein mobile image also without region ash
Rank value is equal to the grayscale value in region that mobile image has already passed through, and is for the first grayscale, the grayscale of mobile image region
Two grayscale, the second grayscale are third grayscale less than the first grayscale, the grayscale in smear region, and the third grayscale is greater than the second grayscale
And it is not equal to the first grayscale；Smear region is measured along the length of image moving direction, which is smear distance.
Preferably, the method grayscale different with calculating of the corresponding green smear distance of green pixel under different grayscale is calculated
The corresponding red smear of red pixel under the method grayscale different from calculating of the corresponding blue smear distance of lower blue pixel point
The method of distance is identical.
Preferably, as shown in figure 5, the mobile image of the input is rectangle, the moving direction and display surface of the rectangle
The a line of plate is parallel.
It preferably, further include that gamma adjustment is carried out to display panel before carrying out blank level adjustment.
The present invention carries out blank level adjustment to display panel first, and it is corresponding to light different pixels point under different grayscale later
Pure color picture calculates the corresponding red smear distance of different pixels point under different grayscale, and chooses the smallest smear apart from right
Overdrive voltage of the overdrive voltage for including in the grayscale signal answered as different pixels point, to realize overdrive voltage
It manually adjusts, is effectively saved cost, improve efficiency.
The present invention also provides a kind of devices of adjust automatically overdrive voltage, comprising:
The first adjustment unit, for carrying out blank level adjustment to display panel；
First control unit, for lighting the corresponding pure color picture of red pixel under different grayscale；
First computing unit, for calculating the corresponding red smear distance of red pixel under different grayscale；
First comparing unit is chosen minimum for the corresponding red smear distance of red pixel under more different grayscale
Red smear overdrive voltage of the overdrive voltage as red pixel that includes in corresponding grayscale signal；
Second control unit lights the corresponding pure color picture of green pixel under different grayscale；
Second computing unit calculates the corresponding green smear distance of green pixel under different grayscale；
Second comparing unit, the corresponding green smear distance of green pixel, chooses the smallest green under more different grayscale
Overdrive voltage of the overdrive voltage that color smear includes in corresponding grayscale signal as green pixel；
Third control unit lights the corresponding pure color picture of blue pixel point under different grayscale；
Third computing unit calculates the corresponding blue smear distance of blue pixel point under different grayscale；
Third comparing unit, the corresponding blue smear distance of blue pixel point, chooses the smallest indigo plant under more different grayscale
Overdrive voltage of the overdrive voltage that color smear includes in corresponding grayscale signal as blue pixel point.
Preferably, first computing unit includes:
Input module, is used for input moving image, and the grayscale of the mobile image is less than the grayscale of present display panel；
Shooting module, for shooting the display panel photo of any moment in image moving process；
Analysis module, for analyze obtain display panel on different zones grayscale value, wherein mobile image also without
The grayscale value in region be equal to the grayscale value in region that mobile image has already passed through, be the first grayscale, mobile image region
Grayscale be the second grayscale, the second grayscale is third grayscale less than the first grayscale, the grayscale in smear region, and the third grayscale is big
In the second grayscale and it is not equal to the first grayscale；
Measurement module, for measuring smear region along the length of image moving direction, which is smear distance.
Preferably, second computing unit and third computing unit are identical as the structure of the first computing unit.
Preferably, the mobile image of the input is rectangle, the moving direction of the rectangle and a line of display panel
In parallel.
Preferably, the device of adjust automatically overdrive voltage further includes second adjustment unit, for carrying out to display panel
Gamma adjustment.
Correspondingly, the display panel includes foregoing adjust automatically the present invention also provides a kind of display panel
The device of overdrive voltage.
In conclusion although the present invention has been disclosed above in the preferred embodiment, but above preferred embodiment is not to limit
The system present invention, those skilled in the art can make various changes and profit without departing from the spirit and scope of the present invention
Decorations, therefore protection scope of the present invention subjects to the scope of the claims.
Claims (11)
1. a kind of method of adjust automatically overdrive voltage, which comprises the following steps:
Blank level adjustment is carried out to display panel；
Light the corresponding pure color picture of red pixel under different grayscale；
Calculate the corresponding red smear distance of red pixel under different grayscale；
Compare the corresponding red smear distance of red pixel under different grayscale, chooses the smallest red smear apart from corresponding ash
Overdrive voltage of the overdrive voltage for including in rank signal as red pixel；
Light the corresponding pure color picture of green pixel under different grayscale；
Calculate the corresponding green smear distance of green pixel under different grayscale；
Compare the corresponding green smear distance of green pixel under different grayscale, chooses the smallest green smear apart from corresponding ash
Overdrive voltage of the overdrive voltage for including in rank signal as green pixel；
Light the corresponding pure color picture of blue pixel point under different grayscale；
Calculate the corresponding blue smear distance of blue pixel point under different grayscale；
Compare the corresponding blue smear distance of blue pixel point under different grayscale, chooses the smallest blue smear apart from corresponding ash
Overdrive voltage of the overdrive voltage for including in rank signal as blue pixel point.
2. the method for adjust automatically overdrive voltage according to claim 1, which is characterized in that calculate red under different grayscale
The method of the corresponding red smear distance of colour vegetarian refreshments are as follows:
Input moving image, the grayscale of the mobile image are less than the grayscale of present display panel；
Shoot the display panel photo of any moment in image moving process；
Analysis obtain display panel on different zones grayscale value, wherein mobile image also without region grayscale value etc.
Grayscale value in the region that mobile image has already passed through is the first grayscale, the grayscale of mobile image region is the second grayscale,
Second grayscale is third grayscale less than the first grayscale, the grayscale in smear region, and the third grayscale is greater than the second grayscale and differs
In the first grayscale；
Smear region is measured along the length of image moving direction, which is smear distance.
3. the method for adjust automatically overdrive voltage according to claim 2, which is characterized in that calculate green under different grayscale
The corresponding blue smear distance of blue pixel point under the method grayscale different with calculating of the corresponding green smear distance of colour vegetarian refreshments
Method grayscale different from calculating under the corresponding red smear distance of red pixel method it is identical.
4. the method for adjust automatically overdrive voltage according to claim 2, which is characterized in that the mobile figure of the input
As being rectangle, the moving direction of the rectangle and a line of display panel are parallel.
5. the method for adjust automatically overdrive voltage according to claim 1, which is characterized in that carrying out blank level adjustment
Before, further includes:
Gamma adjustment is carried out to display panel.
6. a kind of device of adjust automatically overdrive voltage characterized by comprising
The first adjustment unit, for carrying out blank level adjustment to display panel；
First control unit, for lighting the corresponding pure color picture of red pixel under different grayscale；
First computing unit, for calculating the corresponding red smear distance of red pixel under different grayscale；
First comparing unit is chosen the smallest red for the corresponding red smear distance of red pixel under more different grayscale
Overdrive voltage of the overdrive voltage that color smear includes in corresponding grayscale signal as red pixel；
Second control unit lights the corresponding pure color picture of green pixel under different grayscale；
Second computing unit calculates the corresponding green smear distance of green pixel under different grayscale；
Second comparing unit, the corresponding green smear distance of green pixel, chooses the smallest green and drags under more different grayscale
Overdrive voltage of the overdrive voltage that shadow includes in corresponding grayscale signal as green pixel；
Third control unit lights the corresponding pure color picture of blue pixel point under different grayscale；
Third computing unit calculates the corresponding blue smear distance of blue pixel point under different grayscale；
Third comparing unit, the corresponding blue smear distance of blue pixel point, chooses the smallest blue and drags under more different grayscale
Overdrive voltage of the overdrive voltage that shadow includes in corresponding grayscale signal as blue pixel point.
7. the device of adjust automatically overdrive voltage according to claim 6, which is characterized in that the first computing unit packet
It includes:
Input module, is used for input moving image, and the grayscale of the mobile image is less than the grayscale of present display panel；
Shooting module, for shooting the display panel photo of any moment in image moving process；
Analysis module, for analyze obtain display panel on different zones grayscale value, wherein mobile image also without area
The grayscale value in domain is equal to the grayscale value in the region that mobile image has already passed through, and is the ash of the first grayscale, mobile image region
Rank is the second grayscale, and the second grayscale is third grayscale less than the first grayscale, the grayscale in smear region, and the third grayscale is greater than the
Two grayscale and be not equal to the first grayscale；
Measurement module, for measuring smear region along the length of image moving direction, which is smear distance.
8. the device of adjust automatically overdrive voltage according to claim 7, which is characterized in that second computing unit
It is identical as the structure of the first computing unit with third computing unit.
9. the device of adjust automatically overdrive voltage according to claim 7, which is characterized in that the mobile figure of the input
As being rectangle, the moving direction of the rectangle and a line of display panel are parallel.
10. the device of adjust automatically overdrive voltage according to claim 6, which is characterized in that carrying out white balance tune
Before whole, further includes:
Second adjustment unit, for carrying out gamma adjustment to display panel.
11. a kind of display panel, which is characterized in that the device including adjust automatically overdrive voltage as claimed in claim 6.
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| CN201811187629.6A CN109215596B (en) | 2018-10-12 | 2018-10-12 | Method and device for automatically adjusting overdrive voltage and display panel |
| PCT/CN2019/070043 WO2020073545A1 (en) | 2018-10-12 | 2019-01-02 | Method and apparatus for automatically adjusting overdrive voltage, and display panel |
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| CN201811187629.6A CN109215596B (en) | 2018-10-12 | 2018-10-12 | Method and device for automatically adjusting overdrive voltage and display panel |
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| WO2020073545A1 (en) | 2020-04-16 |
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