CN109992147B - Control method and device for cathode voltage of OLED display module - Google Patents
Control method and device for cathode voltage of OLED display module Download PDFInfo
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Abstract
The embodiment of the application relates to the technical field of OLED display, in particular to a control method and device for cathode voltage of a display screen, and the control method and device are used for improving touch kinetic energy of the display screen. In the embodiment of the application, a deviation degree value is determined according to a target voltage and the obtained cathode voltage of the OLED display module; wherein the deviation metric value is indicative of a degree of deviation between the cathode voltage and the target voltage; and if the deviation degree value is larger than a threshold value, adjusting the input voltage of the OLED display module according to the cathode voltage and the target voltage. Therefore, the cathode voltage of the OLED display module obtained according to the adjusted input voltage of the OLED display module can approach the target voltage, the stability of the cathode voltage is improved, and the touch function of the display screen is improved.
Description
Technical Field
The embodiment of the application relates to the technical field of OLED display, in particular to a control method and device for cathode voltage suitable for an OLED display module.
Background
With the development of Organic Light-Emitting Diode (OLED) display technology, users pay more and more attention to the display effect of the OLED display screen in use.
In the prior art, when a display screen of a terminal device displays an image, because an integrated circuit works, a signal generated on a chip of the integrated circuit can generate a coupling effect on a cathode voltage of an OLED display module, so that the cathode voltage is unstable, and when the display screen displays the image, the brightness of the display screen can change and even interfere with a touch function of the display screen, for example, when a user touches a point a of the display screen, the point a does not respond, but the point B responds.
In summary, there is a need for a method for controlling cathode voltage of an OLED display module to improve touch function of a display screen.
Disclosure of Invention
The embodiment of the application provides a control method and device for cathode voltage of an OLED display module, which are used for improving the touch function of a display screen.
The embodiment of the application provides a control method of cathode voltage suitable for an OLED display module, in the method, the cathode voltage of the OLED display module is obtained, a deviation degree value is determined according to the cathode voltage and a target voltage, wherein the deviation degree value is used for indicating the deviation degree between the cathode voltage and the target voltage, and if the deviation degree value is larger than a threshold value, the input voltage of the OLED display module is adjusted according to the cathode voltage and the target voltage.
Optionally, determining a deviation metric value according to the cathode voltage and the target voltage, including any one of the following: determining a deviation degree value between the cathode voltage and the target voltage according to an absolute value of a ratio of a difference value of the cathode voltage and the target voltage to the target voltage, determining a deviation degree value between the cathode voltage and the target voltage according to absolute values of ratios of root mean square of a plurality of first difference values to the target voltage, wherein one first difference value is a difference value between the cathode voltage of one collected OLED display module and the target voltage, and determining a deviation degree value between the cathode voltage and the target voltage according to an absolute value of a ratio of an average value of the absolute values of the plurality of first difference values to the target voltage.
Optionally, the input voltage of the OLED display module is adjusted according to the cathode voltage and the target voltage, including if the cathode voltage is greater than the target voltage, decreasing the input voltage of the OLED display module, and if the cathode voltage is less than the target voltage, increasing the input voltage of the OLED display module.
Optionally, the input voltage of the OLED display module is adjusted according to the cathode voltage and the target voltage, including determining a preset step length according to a difference between the cathode voltage and the target voltage, and adjusting the input voltage of the OLED display module by the preset step length, where the larger an absolute value of the difference between the cathode voltage and the target voltage is, the larger the preset step length is, and the smaller an absolute value of the difference between the cathode voltage and the target voltage is, the smaller the preset step length is.
Optionally, after determining the deviation metric according to the cathode voltage and the target voltage, the method further includes: if the deviation degree value is not greater than the threshold value, the process is ended.
The embodiment of the application provides a control device suitable for cathode voltage of an Organic Light Emitting Diode (OLED) display module, which comprises an acquisition unit, a determination unit and an adjustment unit, wherein the acquisition unit is used for acquiring the cathode voltage of the OLED display module, the determination unit is used for determining a deviation degree value according to the cathode voltage and a target voltage, the deviation degree value is used for indicating the deviation degree between the cathode voltage and the target voltage, and the adjustment unit is used for adjusting the input voltage of the OLED display module according to the cathode voltage and the target voltage if the deviation degree value is greater than a threshold value.
Optionally, the determining unit is specifically configured to any one of the following: determining a deviation degree value between the cathode voltage and the target voltage according to an absolute value of a ratio of a difference value of the cathode voltage and the target voltage to the target voltage, determining a deviation degree value between the cathode voltage and the target voltage according to absolute values of ratios of root mean square of a plurality of first difference values to the target voltage, wherein one first difference value is a difference value between the cathode voltage of one collected OLED display module and the target voltage, and determining a deviation degree value between the cathode voltage and the target voltage according to an absolute value of a ratio of an average value of the absolute values of the plurality of first difference values to the target voltage.
Optionally, the adjusting unit is specifically configured to decrease the input voltage of the OLED display module if the cathode voltage is greater than the target voltage, and increase the input voltage of the OLED display module if the cathode voltage is less than the target voltage.
Optionally, the adjusting unit is specifically configured to determine a preset step length according to a difference between the cathode voltage and the target voltage, and adjust the input voltage of the OLED display module by the preset step length, where the larger an absolute value of the difference between the cathode voltage and the target voltage is, the larger the preset step length is, and the smaller an absolute value of the difference between the cathode voltage and the target voltage is, the smaller the preset step length is.
Optionally, the adjusting unit is further configured to: if the deviation degree value is not greater than the threshold value, the process is ended.
In the embodiment of the application, a deviation degree value is determined according to a target voltage and the acquired cathode voltage of the OLED display module; wherein the deviation degree value is indicative of a degree of deviation between the cathode voltage and the target voltage; and if the deviation degree value is larger than the threshold value, adjusting the input voltage of the OLED display module according to the cathode voltage and the target voltage. Therefore, the cathode voltage of the OLED display module obtained according to the adjusted input voltage of the OLED display module can approach the target voltage, the stability of the cathode voltage is improved, and the touch function of the display screen is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings may be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of an OLED display module according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart of a method for controlling a cathode voltage of an OLED display module according to an embodiment of the present disclosure;
fig. 3 is a schematic flowchart of a method for controlling a cathode voltage of an OLED display module according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a control device for a cathode voltage suitable for an OLED display module according to an embodiment of the present disclosure.
Detailed Description
In order to make the purpose, technical solution and beneficial effects of the present application more clear and more obvious, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Fig. 1 shows a schematic structural diagram of a suitable OLED display module provided in the embodiment of the present application, and as shown in fig. 1, the OLED display module includes a display screen 101, an OLED device, a driving circuit 103, and a substrate 104, and a cathode of the OLED display module is included in the OLED device 102. The substrate 104 is also provided with a control device 105.
Optionally, the control device 105 may be an integrated Circuit, the control device 105 may be connected to the OLED device 102, the control device may further include a detection device, the detection device may be a Flexible Printed Circuit (FPC), and the control device may obtain the cathode voltage through the detection device.
Fig. 2 shows a schematic flow chart of a method for controlling a cathode voltage applied to an OLED display module according to an embodiment of the present application, as shown in fig. 2, including:
and 203, if the deviation degree value is larger than the threshold value, adjusting the input voltage of the OLED display module according to the cathode voltage and the target voltage.
In the embodiment of the application, a deviation degree value is determined according to a target voltage and the acquired cathode voltage of the OLED display module; wherein the deviation degree value is used for indicating the deviation degree between the cathode voltage and the target voltage; and if the deviation degree value is larger than the threshold value, adjusting the input voltage of the OLED display module according to the cathode voltage and the target voltage. Therefore, the cathode voltage of the OLED display module obtained according to the adjusted input voltage of the OLED display module can approach the target voltage, the stability of the cathode voltage is improved, and the touch function of the display screen is improved.
In the embodiment of the present application, the target voltage may be a cathode voltage of an ideal OLED display module, and the target voltage may be a preset voltage, such as-3 volts or 8 volts.
In step 202, the control device determines the deviation metric in various ways, such as alternative embodiment a1, alternative embodiment a2, and alternative embodiment a3.
In an alternative embodiment a1, the control device may determine the deviation degree value between the cathode voltage and the target voltage according to an absolute value of a ratio of a difference between the cathode voltage and the target voltage to the target voltage. The control device can periodically detect that the cathode voltage of the OLED display module is selectable, and the absolute value of the ratio of the difference value of the cathode voltage and the target voltage to the target voltage is the deviation degree value between the cathode voltage and the target voltage. Alternatively, the deviation metric value may be determined as in equation (1):
in the formula (1), P is a deviation degree value, a is a cathode voltage, and B is a target voltage.
For example, assuming that the target voltage is-3 v, the control device detects the cathode voltage every 2 seconds, and the cathode voltage is-2.5 v, the degree of deviation between the cathode voltage and the target voltage is 0.167.
In an alternative embodiment a2, the control device may determine the value of the degree of deviation between the cathode voltage and the target voltage according to an absolute value of a ratio of a root-mean-square of the plurality of first difference values to the target voltage; the first difference is the difference between the collected cathode voltage of the OLED display module and the target voltage; alternatively, the control device may periodically detect the cathode voltage for a period of time and send the cathode voltage for the period of time to the control device, and the control device may acquire the cathode voltages of the N sampling points from the period of time. Optionally, the absolute value of the ratio of the root mean square of the plurality of first difference values to the target voltage is the deviation degree value between the cathode voltage and the target voltage, and optionally, the deviation degree value may be determined as in formula (2):
in the formula (2), P is a deviation degree value, A 1 、A 2 …A N Is the cathode voltage, B is the target voltage, and N is the number of sampling points of the cathode voltage.
For example, assume a target voltage of-3 volts and a cathode voltage where N equals 3,3 sample points of-2.5 volts, -3.2 volts, and-2.8 volts, respectively. The degree of deviation between the cathode voltage and the target voltage is 0.111.
In an alternative embodiment a3, the control device may determine the value of the degree of deviation between the cathode voltage and the target voltage based on an absolute value of a ratio of an average of absolute values of the plurality of first differences to the target voltage. Alternatively, the control device may periodically detect the cathode voltage for a period of time and send the cathode voltage for the period of time to the control device, and the control device may acquire the cathode voltages of the N sampling points from the period of time. Alternatively, the absolute value of the ratio of the average of the absolute values of the plurality of first differences to the target voltage is the value of the degree of deviation between the cathode voltage and the target voltage. Alternatively, the deviation metric value may be determined as in equation (3):
in the formula (3), P is a deviation degree value, A 1 、A 2 …A N Is the cathode voltage, B is the target voltage, and N is the number of sampling points of the cathode voltage.
For example, assume that the target voltage is-3 volts, and that N is equal to the cathode voltages at 3,3 sample points, which are-2.5 volts, -3.2 volts, and-2.8 volts, respectively. The degree of deviation between the cathode voltage and the target voltage is 0.1.
In step 203, in an optional implementation manner, if the deviation degree value is greater than the threshold, determining the cathode voltage and the target voltage, and if the cathode voltage is greater than the target voltage, turning down the input voltage of the OLED display module; and if the cathode voltage is less than the target voltage, increasing the input voltage of the OLED display module.
For example, if the threshold is not 0.01, the target voltage is assumed to be-3 volts, and if the input voltage is initially-3 volts, the cathode voltage detected by the control device is-2.5 volts after the signal generated on the chip couples the cathode voltage of the OLED display module. Thus, the input voltage can be reduced to see if the detected cathode voltage is reduced accordingly, e.g., the input voltage can be-4 volts.
If the input voltage is-3V at the beginning, and the signal generated on the chip generates coupling action on the cathode voltage of the OLED display module, the cathode voltage detected by the control device is-3.5V, and the deviation degree value of 0.167 is greater than the threshold value of 0.01. Thus, the input voltage can be increased to see if the detected cathode voltage will increase, e.g., the input voltage can be-2 volts.
In step 203, in an optional implementation manner, the control device may determine a preset step length according to a difference between the cathode voltage and the target voltage; adjusting the input voltage of the OLED display module by a preset step length; the larger the absolute value of the difference value between the cathode voltage and the target voltage is, the larger the preset step length is; the smaller the absolute value of the difference between the cathode voltage and the target voltage is, the smaller the preset step length is. Alternatively, the control device may determine a value obtained by multiplying a difference between the cathode voltage and the target voltage by a preset value as a preset step length; alternatively, the control device may determine a difference between the cathode voltage and the target voltage as a preset step.
For example, assuming that the target voltage is-3 v, if the input voltage is-3 v at the beginning and the cathode voltage of the OLED display module is coupled by the signal generated on the chip, the cathode voltage detected by the control device is-2.5 v, and the preset step is that the difference between the cathode voltage and the target voltage is 0.5 v, the input voltage is-3-0.5 = -3.5 v.
If the input voltage is-3 volts at the beginning, but the signal generated on the chip generates coupling action on the cathode voltage of the OLED display module, the cathode voltage detected by the control device is-3.5 volts, the preset step length is that the difference value between the cathode voltage and the target voltage is-0.5 volts, and the input voltage is-3- (-0.5) = -2.5 volts.
In this embodiment, in an optional implementation manner, the control device provides an input voltage to the OLED device, and the detection voltage may detect a cathode voltage corresponding to the input voltage and input the cathode voltage to the control device again. The control device may determine the deviation degree value again based on the cathode voltage corresponding to the input voltage and the target voltage, and end the process if the deviation degree value is not greater than the threshold value. And if the deviation degree value is larger than the threshold value, continuously adjusting the input voltage of the OLED display module.
Fig. 3 is a schematic flow chart illustrating a method for controlling a cathode voltage of an OLED display module according to an embodiment of the present application, as shown in fig. 3, including:
in step 305, the control device adjusts the input voltage of the OLED display module by a preset step length.
After the step 305, the control device may further continue the step 301 to continuously obtain the cathode voltage of the OLED display module; until the deviation degree value is not greater than the threshold value, the process is ended.
Based on the above embodiments and the same concept, fig. 4 shows a schematic structural diagram of a control device for a cathode voltage of an organic light emitting diode OLED display module according to an embodiment of the present application; as shown in fig. 4, the apparatus 400 for controlling the cathode voltage of the OLED display module may include an obtaining unit 401, a determining unit 402, and an adjusting unit 403.
The embodiment of the application provides a control device suitable for cathode voltage of an Organic Light Emitting Diode (OLED) display module, which comprises an acquisition unit, a determination unit and an adjustment unit, wherein the acquisition unit is used for acquiring the cathode voltage of the OLED display module, the determination unit is used for determining a deviation degree value according to the cathode voltage and a target voltage, the deviation degree value is used for indicating the deviation degree between the cathode voltage and the target voltage, and the adjustment unit is used for adjusting the input voltage of the OLED display module according to the cathode voltage and the target voltage if the deviation degree value is greater than a threshold value.
In the embodiment of the application, a deviation degree value is determined according to a target voltage and the acquired cathode voltage of the OLED display module; wherein the deviation degree value is used for indicating the deviation degree between the cathode voltage and the target voltage; and if the deviation degree value is larger than the threshold value, adjusting the input voltage of the OLED display module according to the cathode voltage and the target voltage. Therefore, the cathode voltage of the OLED display module obtained according to the adjusted input voltage of the OLED display module can approach the target voltage, the stability of the cathode voltage is improved, and the touch function of the display screen is improved.
In an alternative embodiment, the determining unit is specifically configured to any one of the following: determining a deviation degree value between the cathode voltage and the target voltage according to an absolute value of a ratio of a difference value of the cathode voltage and the target voltage to the target voltage, determining a deviation degree value between the cathode voltage and the target voltage according to absolute values of ratios of root mean square of a plurality of first difference values to the target voltage, wherein one first difference value is a difference value between the cathode voltage of one collected OLED display module and the target voltage, and determining a deviation degree value between the cathode voltage and the target voltage according to an absolute value of a ratio of an average value of the absolute values of the plurality of first difference values to the target voltage.
In an optional embodiment, the adjusting unit is specifically configured to decrease the input voltage of the OLED display module if the cathode voltage is greater than the target voltage, and increase the input voltage of the OLED display module if the cathode voltage is less than the target voltage.
In an optional implementation manner, the adjusting unit is specifically configured to determine a preset step length according to a difference between a cathode voltage and a target voltage, and adjust the input voltage of the OLED display module by the preset step length, where the larger an absolute value of the difference between the cathode voltage and the target voltage is, the larger the preset step length is, and the smaller an absolute value of the difference between the cathode voltage and the target voltage is, the smaller the preset step length is.
In an alternative embodiment, the adjusting unit is further configured to: if the deviation degree value is not greater than the threshold value, the process is ended.
For specific explanation of the control device for cathode voltage of an organic light emitting diode OLED display module provided in the embodiment of the present application, reference may be made to the control device for cathode voltage of an organic light emitting diode OLED display module provided in the above embodiment, which is not described herein again.
It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation. The functional units in the embodiments of the present application may be integrated into one control device, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
In the above embodiments, all or part of the implementation may be realized by software, hardware, firmware or any combination thereof, and when the implementation is realized by a software program, all or part of the implementation may be realized in the form of a computer program product. The computer program product includes one or more instructions. The procedures or functions according to the embodiments of the present application are all or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The instructions may be stored in or transmitted from one computer storage medium to another, for example, instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. A computer storage medium may be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more available media. The usable medium may be a magnetic medium (e.g., a flexible Disk, a hard Disk, a magnetic tape, a magneto-optical Disk (MO), etc.), an optical medium (e.g., a CD, a DVD, a BD, an HVD, etc.), or a semiconductor medium (e.g., a ROM, an EPROM, an EEPROM, a non-volatile memory (NAND FLASH), a Solid State Disk (SSD)), etc.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, embodiments of the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by instructions. These instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
The instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.
Claims (6)
1. A control method of cathode voltage suitable for an Organic Light Emitting Diode (OLED) display module is characterized in that the method is applied to an integrated circuit, and the integrated circuit comprises a Flexible Printed Circuit (FPC); the method comprises the following steps:
the FPC acquires the cathode voltage of the OLED display module;
the integrated circuit determines a deviation degree value according to the cathode voltage and a target voltage; wherein the deviation metric value is indicative of a degree of deviation between the cathode voltage and the target voltage;
if the deviation degree value is larger than a threshold value, adjusting the input voltage of the OLED display module according to the cathode voltage and the target voltage;
determining a deviation metric value according to the cathode voltage and a target voltage, including any one of:
determining a deviation degree value between the cathode voltage and the target voltage according to an absolute value of a ratio of a root mean square of the plurality of first difference values to the target voltage; the first difference is the difference between the cathode voltage of any one of the OLED display modules and the target voltage, which is acquired in the process that the integrated circuit periodically detects the cathode voltage within a period of time;
determining a deviation degree value between the cathode voltage and the target voltage according to an absolute value of a ratio of an average value of absolute values of the plurality of first difference values to the target voltage;
the adjusting the input voltage of the OLED display module according to the cathode voltage and the target voltage comprises:
multiplying the difference value of the cathode voltage and the target voltage by a preset value to determine a preset step length;
adjusting the input voltage of the OLED display module by the preset step length;
the larger the absolute value of the difference value between the cathode voltage and the target voltage is, the larger the preset step length is; the smaller the absolute value of the difference between the cathode voltage and the target voltage is, the smaller the preset step length is.
2. The method according to claim 1, wherein the adjusting the input voltage of the OLED display module according to the cathode voltage and the target voltage comprises:
if the cathode voltage is larger than the target voltage, the input voltage of the OLED display module is adjusted to be small;
and if the cathode voltage is less than the target voltage, increasing the input voltage of the OLED display module.
3. The method of claim 1, wherein after determining a deviation metric value based on the cathode voltage and a target voltage, further comprising:
and if the deviation degree value is not greater than the threshold value, ending the processing.
4. A control device suitable for the cathode voltage of an organic light-emitting diode OLED display module is characterized in that the control device is an integrated circuit, and the integrated circuit comprises a Flexible Printed Circuit (FPC); the FPC is used for acquiring the cathode voltage of the OLED display module; the method comprises the following steps:
the acquisition unit is used for acquiring the cathode voltage of the OLED display module;
the determining unit is used for determining a deviation degree value according to the cathode voltage and a target voltage; wherein the deviation metric value is indicative of a degree of deviation between the cathode voltage and the target voltage;
the adjusting unit is used for adjusting the input voltage of the OLED display module according to the cathode voltage and the target voltage if the deviation degree value is larger than a threshold value;
the determining unit is specifically configured to any one of the following:
determining a deviation degree value between the cathode voltage and the target voltage according to an absolute value of a ratio of a root mean square of the plurality of first difference values to the target voltage; the first difference is the difference between the cathode voltage of any one of the OLED display modules and the target voltage, which is acquired in the process that the integrated circuit periodically detects the cathode voltage within a period of time;
determining a deviation degree value between the cathode voltage and the target voltage according to an absolute value of a ratio of an average value of absolute values of the plurality of first difference values to the target voltage;
the adjusting unit is specifically configured to:
multiplying the difference value of the cathode voltage and the target voltage by a preset value to determine a preset step length;
adjusting the input voltage of the OLED display module by the preset step length;
wherein, the larger the absolute value of the difference between the cathode voltage and the target voltage is, the larger the preset step length is; the smaller the absolute value of the difference between the cathode voltage and the target voltage is, the smaller the preset step length is.
5. The apparatus according to claim 4, wherein the adjusting unit is specifically configured to:
if the cathode voltage is larger than the target voltage, the input voltage of the OLED display module is adjusted to be small;
and if the cathode voltage is less than the target voltage, increasing the input voltage of the OLED display module.
6. The apparatus of claim 4, wherein the adjustment unit is further configured to:
and if the deviation degree value is not greater than the threshold value, ending the processing.
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