Patent Grant
10789896
The present application is a 35 U.S.C. 371 national stage application of PCT International Application No. PCT/CN2018/092788, filed on Jun. 26, 2018, which claims the benefit of Chinese Patent Application No. 201710711889.8, filed on Aug. 18, 2017, the contents of which are incorporated herein by reference in their entireties. The above-referenced PCT International Application was published in the Chinese language as International Publication No. WO 2019/033853 A1 on Feb. 21, 2019.
The present disclosure relates to the field of display technologies, and particularly to a method and device for adjusting a backlight.
A backlight is a light source which is arranged behind a liquid crystal display. The light emitting effect of the backlight directly affects visual effects of the liquid crystal display. Currently, a LED (Light Emitting Diode) is generally used as the backlight of the liquid crystal display.
Embodiments of the present disclosure provide a method for adjusting a backlight, comprise: obtain a value for a parameter of a light emitting device in the backlight; determine an average value according to the obtained value; and when the average value is beyond a preset parameter range, adjusting a value of voltage which is input to the light emitting device.
Optionally, the light emitting device comprises at least one lamp string.
Optionally, the parameter is current, and adjusting the value of voltage which is input to the light emitting device comprises: when the average value is smaller than a minimum rated current in a preset current range, increasing the value of voltage which is input to the light emitting device; and when the average value is larger than a maximum rated current in the preset current range, decreasing the value of voltage which is input to the light emitting device.
Optionally, increasing the value of voltage which is input to the light emitting device comprises: according to a current difference between the average value and the minimum rated current, determining a first adjustment amount of a duty cycle of a voltage control signal; and increasing the duty cycle of the voltage control signal by the first adjustment amount.
Optionally, decreasing the value of voltage which is input to the light emitting device comprises: according to a current difference between the average value and the maximum rated current, determining a second adjustment amount for the duty cycle of the voltage control signal; and decreasing the duty cycle of the voltage control signal by the second adjustment amount.
Optionally, the parameter is brightness, and adjusting the value of voltage which is input to the light emitting device comprises: when the average value is smaller than a minimum rated brightness in a preset brightness range, increasing the value of voltage which is input to the light emitting device; and when the average value is larger than a maximum rated brightness in the preset brightness range, decreasing the value of voltage which is input to the light emitting device.
Optionally, increasing the value of voltage which is input to the light emitting device comprises: according to a brightness difference between the average value and the minimum rated brightness, determining a third adjustment amount of the duty cycle of the voltage control signal; and increasing the duty cycle of the voltage control signal by the third adjustment amount.
Optionally, decreasing the value of voltage which is input to the light emitting device comprises: according to a brightness difference between the average value and the maximum rated brightness, determining a fourth adjustment amount of the duty cycle of the voltage control signal; and decreasing the duty cycle of the voltage control signal by the fourth adjustment amount.
Embodiments of the present disclosure further provide a device for adjusting a backlight, comprising: a detecting unit configured to obtain a value for a parameter of a light emitting device in the backlight; a determining unit configured to determine an average value according to the obtained value; and a control unit configured to, when the average value is beyond a preset parameter range, adjust a value of voltage which is input to the light emitting device.
Optionally, the parameter is current, and the control unit is configured to: when the average value is smaller than a minimum rated current in a preset current range, increase the value of voltage which is input to the light emitting device; and when the average value is larger than a maximum rated current in the preset current range, decrease the value of voltage which is input to the light emitting device.
Optionally, the control unit is configured to: when the average value is smaller than a minimum rated current in a preset current range, according to a current difference between the average value and the minimum rated current, determine a first adjustment amount of a duty cycle of a voltage control signal; and increase the duty cycle of the voltage control signal by the first adjustment amount.
Optionally, the control unit is configured to: when the average value is larger than a maximum rated current in the preset current range, according to a current difference between the average value and the maximum rated current, determine a second adjustment amount for the duty cycle of the voltage control signal; and decrease the duty cycle of the voltage control signal by the second adjustment amount.
Optionally, the light emitting device comprises at least one lamp string, and the detecting unit comprises at least one current detector, the at least one current detector is connected with the at least one lamp string in a one-to-one corresponding relation.
Optionally, the parameter is brightness, and the control unit is configured to: when the average value is smaller than a minimum rated brightness in a preset brightness range, increase the value of voltage which is input to the light emitting device; and when the average value is larger than a maximum rated brightness in the preset brightness range, decrease the value of voltage which is input to the light emitting device.
Optionally, the control unit is configured to: when the average value is smaller than a minimum rated brightness in a preset brightness range, according to a brightness difference between the average value and the minimum rated brightness, determine a third adjustment amount of the duty cycle of the voltage control signal; and increase the duty cycle of the voltage control signal by the third adjustment amount.
Optionally, the control unit is configured to: when the average value is larger than a maximum rated brightness in the preset brightness range, according to a brightness difference between the average value and the maximum rated brightness, determine a fourth adjustment amount of the duty cycle of the voltage control signal; and decrease the duty cycle of the voltage control signal by the fourth adjustment amount.
Optionally, the light emitting device comprises at least one lamp string; the detecting unit comprises a light sensor which is configured to detect brightness of the at least one lamp string.
To make the objects, the technical solutions and the advantages of embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described in detail hereinafter in conjunction with the drawings of the embodiments of the present disclosure. Apparently, the embodiments described hereinafter are only some embodiments of the present disclosure, but not all embodiments. Based the embodiments described hereinafter, other embodiments obtained by those skilled in the art should fall within the scope of the present disclosure.
In a relevant technique, as shown
Embodiments of the present disclosure provide a method for adjusting a backlight. As shown
S201, obtaining a value for a parameter of a light emitting device in the backlight;
S202, determining an average value of the parameter, according to the detected values of the parameter;
S203, in case it is determined the average value of the parameter is beyond a preset rated range of the parameter, adjusting a value of voltage which is input to each of the lamp strings.
In the method for adjust a backlight according to embodiment of the present disclosure, the parameter can be set as one of detectable physical quantities of the backlight. The physical quantity for example can be a current through a light emitting device, brightness of the light emitting device, or the like. An average value of the parameter is obtained according to values of the parameter which are detected in real time. When the average value is beyond a preset parameter range, a value of voltage which is input to the light emitting device is adjusted, so that the current through the light emitting device is adjusted, and brightness of the backlight is adjusted. Thereby, brightness of the backlight can be adjusted in different ways, so that brightness of the backlight can be stable in different environments.
The light emitting device in the backlight is generally a LED. Embodiments of the present disclosure will be described hereinafter by referring to a case in which LED is used as the light emitting device in the backlight. In practice, since in the LED of the backlight has its own rated current range and rated brightness range. In case power source voltage which is input to the LED is unstable, for example, increases or decreases, the current through the LED deviates from the rated current range. As a result, brightness of the backlight varies significantly, which will affect stability of the brightness of backlight. Thus, by detecting current through the LED, brightness of the backlight can be adjusted, and in case the backlight is applied to a liquid crystal display, display effect of the liquid crystal display can be improved. Alternatively, in case the backlight is applied to a high temperature environment, a current through the LED will be attenuated due to the characteristics of the LED, and the current through the LED will accordingly deviate from the rated current range, so that brightness of the backlight will be attenuated. Thus, by detecting the current through the LED or brightness of LED, brightness of the backlight can be adjusted, so as to improve display effect of the liquid crystal display. However, even the current through the LED is within the rated current range, the loss due to long-time operation of LED (e.g., for 3, 5 or more years) causes brightness of the LED to suffer from attenuation, so that brightness of the backlight suffers from dramatic attenuation. In this case, brightness of the backlight can be increased firstly to satisfy the brightness requirement for the liquid crystal display to display an image. In this way, brightness of the backlight be adjusted by detecting brightness of the LED, so as to improve display effect of the liquid crystal display.
In some embodiments, in step S201, the value for the parameter of the light emitting device in the backlight for example can be obtained in real time, so that brightness of the backlight is adjusted in real time.
In some embodiments, the light emitting device comprises at least one lamp string. The light emitting device can also be a single light emitting device or a single lamp string. In this case, values of the parameter of the light emitting device can be obtained in several times, so that the average value is obtained.
In practice, in the adjusting method according to embodiments of the present disclosure, the current through the LED is taken as the parameter, i.e., the parameter is the current. The preset current range can be a range defined by I0±ΔI, wherein I0 represents an average value of a rated current of all lamp strings in the backlight, and ΔI represents a value by which the current can deviate from I0 within the allowable error. In practice, specific values of I0 and ΔI are set according to practical needs, which are not defined here.
In practice, in the adjusting method according to embodiments of the present disclosure, the parameter is current, and adjusting the value of voltage which is input to the light emitting device comprises: when the average value is smaller than a minimum rated current in a preset current range, increasing the value of voltage which is input to the light emitting device; and when the average value is larger than a maximum rated current in the preset current range, decreasing the value of voltage which is input to the light emitting device.
In particular, in case the parameter is current, reference is made to a case in which the backlight comprises 6 lamp strings L1˜L6, V0 represents the power source voltage which is input to 6 lamp strings, Imin represents the minimum rated current in a preset rated current range, Imax represents the maximum rated current in the preset rated current range. By detecting in real time values of corresponding currents of 6 lamp strings L1˜L6 in the backlight, six values of current I1, I2, I3, I4, I5, I6 can be obtained. The average value Ī for these 6 current values is Ī=I1+I2+I3+I4+I5+I6/6. In case Ī<Imin, the value of voltage V0 which is input to these 6 lamp strings L1˜L6 is increased. When the increased value of voltage V0 is input to these 6 lamp strings L1˜L6, the value of currents I1, I2, I3, I4, I5, I6 through these 6 lamp strings L1˜L6 can be also increased, so that Ī is increased. In this way, Ī is adjusted towards the preset rated range of current, and satisfies the preset rated range of current. Thus brightness of the backlight is adjusted, and brightness of the backlight is stable. In case Ī>Imax, the value of voltage V0 which is input to these 6 lamp strings L1˜L6 is decreased. When the decreased value of voltage V0 is input to these 6 lamp strings L1˜L6, the value of currents I1, I2, I3, I4, I5, I6 through these 6 lamp strings L1˜L6 can also be decreased, so that Ī is decreased. In this way, Ī is adjusted towards the preset rated range of current, and satisfies the preset rated range of current. Thus brightness of the backlight is adjusted, and brightness of the backlight is stable.
In practice, in the adjusting method according to embodiments of the present disclosure, the brightness of the LED is taken as the parameter, i.e., the parameter is the brightness. The preset brightness range can be a range defined by Lm0±ΔLm, wherein Lm0 represents an average value of a rated brightness of all lamp strings in the backlight, and ΔLm represents a value by which the brightness can be deviated from Lm0 within the allowable error. In practice, specific values of Lm0 and ΔLm are set according to practical needs, which are not defined here.
In practice, in the adjusting method according to embodiments of the present disclosure, the parameter is brightness, and adjusting the value of voltage which is input to the light emitting device comprises: when the average value is smaller than a minimum rated brightness in a preset brightness range, increasing the value of voltage which is input to the light emitting device; and when the average value is larger than a maximum rated brightness in the preset brightness range, decreasing the value of voltage which is input to the light emitting device.
In particular, in case the parameter is brightness, reference is made to a case in which the backlight comprises 6 lamp strings L1˜L6, V0 represents the power source voltage which is input to 6 lamp strings, Lmmin represents the minimum rated brightness in a preset rated brightness range, Lmmax represents the maximum rated brightness in a preset rated brightness range. By detecting in real time values of corresponding brightness of 6 lamp strings L1˜L6 in the backlight, six values of currents Lm1, Lm2, Lm3, Lm4, Lm5, Lm6 can be obtained. The average value
The procedure of increasing or decreasing the value of voltage which is input to each of the lamp strings will be described hereinafter in embodiments in which the parameter is current or brightness.
In some embodiments, the parameter is current, and increasing the value of voltage which is input to the light emitting device comprises: according to a current difference between the average value and the minimum rated current, determining a first adjustment amount of a duty cycle of a voltage control signal; and increasing the duty cycle of the voltage control signal by the first adjustment amount.
In practice, the voltage control signal is a PWM (Pulse Width Modulation) signal which can be modulated in terms of its pulse width. The duty cycle of the voltage control signal is a time ratio by which its effective pulse signal occupies the voltage control signal. The effective pulse signal of the voltage control signal is used to control the value of voltage which is output to the lamp strings. The larger the duty cycle of the voltage control signal is, the more power is output to the lamp strings. In practice, a control signal which is generally used to control the magnitude of value of voltage output to the lamp strings can be taken as the voltage control signal.
In practice, in the adjusting method according to embodiments of the present disclosure, a corresponding relation between the current difference between the average value of the current and the minimum rated value and the first adjustment amount of the duty cycle is stored in advanced. The corresponding relation is: the larger the current difference between the average value of the current and the minimum rated value is, the larger the first adjustment amount of the corresponding duty cycle is. In practice, the pre-stored corresponding relation between the current difference between the average value of the current and the minimum rated value and the first adjustment amount of the duty cycle is a corresponding relation which can be obtained by a person with ordinary skill in the art based on experience, and is designed according to practical needs, which is not repeated for simplicity.
In particular, according to
It is noted that
In some embodiments, the parameter is current, and decreasing the value of voltage which is input to the light emitting device comprises: according to a current difference between the average value and the maximum rated current, determining a second adjustment amount for the duty cycle of the voltage control signal; and decreasing the duty cycle of the voltage control signal by the second adjustment amount.
In practice, the voltage control signal is a PWM signal which can be modulated in terms of its pulse width. The duty cycle of the voltage control signal is a time ratio by which its effective pulse signal occupies the voltage control signal. The effective pulse signal of the voltage control signal is used to control the value of voltage which is output to the lamp strings. The larger the duty cycle of the voltage control signal is, the more power is output to the lamp strings. In practice, a control signal which is generally used to control the magnitude of value of voltage output to the lamp strings can be taken as the voltage control signal.
In practice, in the adjusting method according to embodiments of the present disclosure, a corresponding relation between the current difference between the average value of the current and the maximum rated value and the second adjustment amount of the duty cycle is stored in advanced. The corresponding relation is: the larger the current difference between the average value of the current and the maximum rated value is, the larger the second adjustment amount of the corresponding duty cycle is. In practice, the pre-stored corresponding relation between the current difference between the average value of the current and the maximum rated value and the second adjustment amount of the duty cycle is a corresponding relation which can be obtained by the person with ordinary skill in the art based on experience, which is not repeated for simplicity.
In particular, according to
It is noted that
In some embodiments, the parameter is brightness, and increasing the value of voltage which is input to the light emitting device comprises: according to a brightness difference between the average value and the minimum rated brightness, determining a third adjustment amount of the duty cycle of the voltage control signal; and increasing the duty cycle of the voltage control signal by the third adjustment amount.
In practice, the voltage control signal is a PWM signal which can be modulated in terms of its pulse width. The duty cycle of the voltage control signal is a time ratio by which its effective pulse signal occupies the voltage control signal. The effective pulse signal of the voltage control signal is used to control the value of voltage which is output to the lamp strings. The larger the duty cycle of the voltage control signal is, the more power is output to the lamp strings. In practice, a control signal which is generally used to control the magnitude of value of voltage output to the lamp strings can be taken as the voltage control signal.
In practice, in the adjusting method according to embodiments of the present disclosure, a corresponding relation between the brightness difference between the average value of the brightness and the minimum rated value and a third adjustment amount of the duty cycle is stored in advanced. The corresponding relation is: the larger the brightness difference between the average value of the brightness and the minimum rated value is, the larger the third adjustment amount of the corresponding duty cycle is. In practice, the pre-stored corresponding relation between the brightness difference between the average value of the brightness and the minimum rated value and the third adjustment amount of the duty cycle is a corresponding relation which can be obtained by the person with ordinary skill in the art based on experience, which is not repeated for simplicity.
In particular, when the brightness difference between the average value of brightness
In some embodiments, the parameter is brightness, and decreasing the value of voltage which is input to the light emitting device comprises: according to a brightness difference between the average value and the maximum rated brightness, determining a fourth adjustment amount of the duty cycle of the voltage control signal; and decreasing the duty cycle of the voltage control signal by the fourth adjustment amount.
In practice, the voltage control signal is a PWM signal which can be modulated in terms of its pulse width. The duty cycle of the voltage control signal is a time ratio by which its effective pulse signal occupies the voltage control signal. The effective pulse signal of the voltage control signal is used to control the value of voltage which is output to the lamp strings. The larger the duty cycle of the voltage control signal is, the more power is output to the lamp strings. In practice, a control signal which is generally used to control the magnitude of value of voltage output to the lamp strings can be taken as the voltage control signal.
In practice, in the adjusting method according to embodiments of the present disclosure, a corresponding relation between the brightness difference between the average value of brightness and the maximum rated value and a fourth adjustment amount of the duty cycle is stored in advanced. The corresponding relation is: the larger the brightness difference between the average value of brightness and the maximum rated value is, the larger the fourth adjustment amount of the corresponding duty cycle is. In practice, the pre-stored corresponding relation between the brightness difference between the average value of brightness and the maximum rated value and the fourth adjustment amount of the duty cycle can be obtained by the person with ordinary skill in the art based on experience corresponding relation, and is designed according to practical needs, which is not repeated for simplicity.
In particular, when the brightness difference between the average value of brightness
On basis of a same concept, embodiments of the present disclosure further provide a device for adjusting a backlight. A shown
In the device for adjusting a backlight according to an embodiment of the present disclosure, the parameter can be set as one of detectable physical quantities of the backlight. The physical quantity for example can be a current through a light emitting device, brightness of the light emitting device, or the like. An average value of the parameter is obtained according to values of the parameter which are detected in real time. When the average value is beyond a preset parameter range, a value of voltage which is input to the light emitting device is adjusted, so that the current through the light emitting device is adjusted, and brightness of the backlight is adjusted. Thereby, brightness of the backlight can be adjusted in different ways, so that brightness of the backlight can be stable in different environments
In practice, in the device according to embodiments of the present disclosure, the current through the LED is taken as the parameter, i.e., the parameter is current. The preset current range can be defined by I0±ΔI, wherein I0 represents the average value of the rated current for all lamp strings in the backlight, ΔI represents a value by which the current can deviate from I0 within the allowable error. In practice, specific values of I0 and ΔI are set according to practical needs, which are not defined here.
In practice, in the device according to embodiments of the present disclosure, the parameter is current, and the control unit is configured to: when the average value is smaller than a minimum rated current in a preset current range, increase the value of voltage which is input to the light emitting device; and when the average value is larger than a maximum rated current in the preset current range, decrease the value of voltage which is input to the light emitting device.
In some embodiments, the control unit is configured to: when the average value is smaller than a minimum rated current in a preset current range, according to a current difference between the average value and the minimum rated current, determine a first adjustment amount of a duty cycle of a voltage control signal; and increase the duty cycle of the voltage control signal by the first adjustment amount. In practice, in the device according to embodiments of the present disclosure, a corresponding relation between the current difference between the average value of the current and the minimum rated value and the first adjustment amount of the duty cycle is stored in advanced. The corresponding relation is: the larger the current difference between the average value of the current and the minimum rated value is, the larger the first adjustment amount of the corresponding duty cycle is. In practice, the pre-stored corresponding relation between the current difference between the average value of the current and the minimum rated value and the first adjustment amount of the duty cycle is a corresponding relation which can be obtained by the person with ordinary skill in the art based on experience, which is not repeated for simplicity.
In some embodiments, when the average value is larger than a maximum rated current in the preset current range, according to a current difference between the average value and the maximum rated current, a second adjustment amount for the duty cycle of the voltage control signal is determined; and the duty cycle of the voltage control signal is decreased by the second adjustment amount. In practice, in the device according to embodiments of the present disclosure, is stored in advanced the corresponding relation between the current difference between the average value of the current and the maximum rated value and the second adjustment amount of the duty cycle. The corresponding relation is: the larger the current difference between the average value of the current and the maximum rated value is, the larger the second adjustment amount of the corresponding duty cycle is. In practice, the pre-stored corresponding relation between the current difference between the average value of the current and the maximum rated value and the second adjustment amount of the duty cycle is a corresponding relation which can be obtained by the person with ordinary skill in the art based on experience, which is not repeated for simplicity.
In case the parameter is current, in the device according to embodiments of the present disclosure, as shown
In practice, in the device according to embodiments of the present disclosure, the brightness of the LED is taken as the parameter, i.e., the parameter is brightness. The preset rated range of brightness can be defined by Lm0±ΔLm, wherein Lm0 represents the average value of rated brightness of all lamp strings in the backlight, ΔLm represents a value by which the brightness can deviate from Lm0 within the allowable error. In practice, specific values of Lm0 and ΔLm are set according to practical needs, which are not defined here.
In practice, in the device according to embodiments of the present disclosure, the parameter is brightness, and the control unit is configured to: when the average value is smaller than a minimum rated brightness in a preset brightness range, increase the value of voltage which is input to the light emitting device; and when the average value is larger than a maximum rated brightness in the preset brightness range, decrease the value of voltage which is input to the light emitting device.
In some embodiments, the control unit is configured to: when the average value is smaller than a minimum rated brightness in a preset brightness range, according to a brightness difference between the average value and the minimum rated brightness, determine a third adjustment amount of the duty cycle of the voltage control signal; and increase the duty cycle of the voltage control signal by the third adjustment amount. In practice, in the device according to embodiments of the present disclosure, is stored in advanced a corresponding relation between the brightness difference between the average value of the brightness and the minimum rated value and the third adjustment amount of the duty cycle. The corresponding relation is: the larger the brightness difference between the average value of the brightness and the minimum rated value is, the larger the third adjustment amount of the corresponding duty cycle is. In practice, the pre-stored corresponding relation between the brightness difference between the average value of the brightness and the minimum rated value and the third adjustment amount of the duty cycle is a corresponding relation which can be obtained by the person with ordinary skill in the art based on experience, which is not repeated for simplicity.
In some embodiments, the control unit is configured to: when the average value is larger than a maximum rated brightness in the preset brightness range, according to a brightness difference between the average value and the maximum rated brightness, determine a fourth adjustment amount of the duty cycle of the voltage control signal; and decrease the duty cycle of the voltage control signal by the fourth adjustment amount. In practice, in the device according to embodiments of the present disclosure, is stored in advanced the corresponding relation between the brightness difference between the average value of brightness and the maximum rated value and the fourth adjustment amount of the duty cycle. The corresponding relation is: the larger the brightness difference between the average value of brightness and the maximum rated value is, the larger the fourth adjustment amount of the corresponding duty cycle is. In practice, the pre-stored corresponding relation between the brightness difference between the average value of brightness and the maximum rated value and the fourth adjustment amount of the duty cycle is a corresponding relation which can be obtained by the person with ordinary skill in the art based on experience, which is not repeated for simplicity.
In some embodiments, as shown
In the context of the present disclosure, respective “unit” and “module” in each embodiment can be implemented by a computer or by a computer in combination with suitable sensors. The processing procedure of each unit and module can for example realized by a processor in the computer.
In practice, in the device according to embodiments of the present disclosure, the determining unit 20 can comprise a first processor which is formed by software and hardware. The first processor is used to determine the average value of the parameter according to values of the detected parameter. In practice, it is understood by the person with ordinary skill in the art that the specific structure of the first processor is designed according to practical needs.
In practice, in the device according to embodiments of the present disclosure, the control unit 30 can comprise a second processor which is formed by software and hardware. The second processor is used to adjust the value of voltage which is input to each of the lamp strings, in case it is determined the average value of the parameter is beyond a preset rated range of the parameter. In practice, it is understood by the person with ordinary skill in the art that the specific structure of the second processor is designed according to practical needs.
In the method for adjusting a backlight and a device for adjusting a backlight according to embodiments of the present disclosure. The parameter can be set as one of detectable physical quantities of the backlight. The physical quantity for example can be a current through a light emitting device, brightness of the light emitting device, or the like. An average value of the parameter is obtained according to values of the parameter which are detected in real time. When the average value is beyond a preset parameter range, a value of voltage which is input to the light emitting device is adjusted, so that the current through the light emitting device is adjusted, and brightness of the backlight is adjusted. Thereby, brightness of the backlight can be adjusted in different ways, so that brightness of the backlight can be stable in different environments
Apparently, the person with ordinary skill in the art can make various modifications and variations to the present disclosure without departing from the spirit and the scope of the present disclosure. In this way, provided that these modifications and variations of the present disclosure belong to the scopes of the claims of the present disclosure and the equivalent technologies thereof, the present disclosure also intends to encompass these modifications and variations.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2017 1 0711889 | Aug 2017 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2018/092788 | 6/26/2018 | WO | 00 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2019/033853 | 2/21/2019 | WO | A |
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| Number | Date | Country | |
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| 20190197969 A1 | Jun 2019 | US |
