CN100350809C - Portable electronic device and its power management method - Google Patents

Abstract

A portable electronic device and a power management method thereof are provided, which bring the processing action of a program being executed by the portable electronic device into the control range of power management, so that the portable electronic device can save more energy and improve the reaction time after the processing action of the program is recovered to be executed.

Description

Portable electronic device and its power management method

technical field

The present invention relates to a portable electronic device and its power management method, and in particular to a power management method of the portable electronic device to reduce power consumption.

Background technique

With the success of miniaturization of core computing chips and components, portable electronic devices, such as mobile phones, personal digital assistants, digital cameras and MP3 players (MPEG- 3player) and so on, most of them have diversified functions to meet the increasing needs of users. The reason why such a portable electronic device can provide a variety of functions, in addition to the hardware design, the portable electronic device itself has a programmable function or an operating system, so that various applications can be used according to executed according to the needs of the reader.

Portable electronic devices, such as mobile phones, emphasize power saving or low power consumption functions to increase their standby time. However, with the increasing needs of users, portable electronic devices, especially in the design of the man-machine-interface (MMI), must have functions that are convenient and attractive to users, but such functions will increase the number of man-machine interfaces. Due to the complexity of the interface, the processor of the portable electronic device will increase the workload and consume more energy.

For this reason, most portable electronic devices have power management functions to save power. Take a mobile phone as an example, its power management function will turn off the backlight of the screen when the mobile phone is in a standby state to save power. However, most of the current portable electronic devices, such as mobile phones, have color LCD screens, which consume more power than monochrome LCD screens; moreover, in order to arouse users' interest, most of these mobile phones have animation functions. function, so the power consumption of the portable electronic device will inevitably increase accordingly. Although the known power management method will turn off the backlight of the screen during standby, the known mobile phone power management method can only control the hardware switch to save power, so it cannot reduce the energy consumed when playing animation. Moreover, when the mobile phone user touches the input interface again to view the display screen, the animation is played again; but because a period of time has passed between adjacent frames, the user will feel that the next frame has not been displayed for a long time, as if The phone is dead. This phenomenon of screen lag, in addition to making users feel inconvenient that the mobile phone cannot be used immediately, will also give rise to a bad evaluation of the mobile phone.

As far as the current trend of diversifying the functions of portable electronic devices is concerned, the visual functions of the man-machine interface of new products, such as the function of playing animation, will inevitably continue to be enhanced. But relatively, such enhancement of visual function will inevitably increase the power consumption of the portable electronic device; thus, the standby time will be shortened. Moreover, when the portable electronic device returns to the standby state from the state of turning off the backlight, the screen action will be sluggish, causing inconvenience to the user and bad evaluation of the portable electronic device. Therefore, the competitiveness of the product will be negatively affected

Therefore, designers of portable electronic devices must come up with solutions to solve the above-mentioned problems.

Contents of the invention

In view of this, the purpose of the present invention is to provide a portable electronic device and its power management method, to reduce the power consumption of the portable electronic device when playing dynamic pictures; in addition, the portable electronic device returns to the standby state from the power saving state At this time, the reaction action of the dynamic picture will be improved.

According to an object of the present invention, a kind of power management method of portable electronic device is proposed, and this method comprises:

Start a picture update timer, wherein the time limit of the picture update timer is a picture update time;

Start a picture display timer, wherein the time limit of the picture display timer is a picture display time;

When the picture update time expires, the portable electronic device performs an image processing operation and displays the result of the image processing operation, and restarts the picture update timer;

When the screen display time expires, suspend the screen update timer;

Wherein, when the frame update timer is suspended, the portable electronic device does not perform image processing operation, so as to reduce the energy consumption of the portable electronic device.

According to an object of the present invention, a method for power management of a portable electronic device is proposed, wherein the portable electronic device displays an image sequence composed of a plurality of frames, the method comprising:

When the portable electronic device enters a standby state:

Start a replacement frame timer, wherein the time limit of the replacement frame timer is a replacement frame time;

Start a picture display timer, wherein the time limit of the picture display timer is a picture display time;

When the portable electronic device is in the standby state:

When the frame replacement time expires, the portable electronic device displays one of the frames, and restarts the frame replacement timer to display the frames one by one;

When the screen display time expires, suspend changing the frame timer and enter a power-saving state;

Wherein, when the replacement frame timer is suspended, the portable electronic device does not process the display action of the image sequence, so as to reduce the energy consumption of the portable electronic device.

According to an object of the present invention, a kind of portable electronic device is proposed, and this portable electronic device comprises:

a memory storing a plurality of program instructions; and

A processor, coupled to the memory, is used to execute the program instructions to perform at least the following actions:

Start a picture update timer, wherein the time limit of the picture update timer is a picture update time;

Start a picture display timer, wherein the time limit of the picture display timer is a picture display time;

When the frame update time expires, the processor performs an image processing operation to display the result of the image processing operation, and restarts the frame update timer;

When the screen display time expires, suspend the screen update timer;

Wherein, when the frame update timer is suspended, the processor does not perform image processing operation, so as to reduce the energy consumption of the portable electronic device.

In order to make the above-mentioned purposes, features, and advantages of the present invention more obvious and understandable, a preferred embodiment is specifically cited below, combined with the accompanying drawings, for the following detailed description:

Description of drawings

FIG. 1 shows a timing diagram to illustrate the principle of the power management method of the portable electronic device of the present invention.

2 and 3 show a flow chart to illustrate a preferred embodiment of a power management method for a portable electronic device according to the present invention.

FIG. 4 is an embodiment of a portable electronic device according to the present invention.

Detailed ways

The principle of the power management method of the portable electronic device of the present invention is to bring the processing action of the program being executed by the portable electronic device into the control range of power management, so that the portable electronic device can save more energy and improve the program accordingly The reaction time after the processing action is resumed.

The above-mentioned principle can be illustrated by the timing diagram in FIG. 1 . In FIG. 1 , the horizontal axis is the time axis, and the solid arrows on the time axis respectively represent events occurring at a certain time point, such as events 110 , 112 , 114 and 120 . The dotted arrows respectively represent events (such as event 130 ) that can be avoided when using the power management method of the present invention, whereby the portable electronic device can save more energy. In this example, the portable electronic device displays an animation composed of a plurality of frames under certain preset conditions, such as standby.

From Fig. 1, at the time point _t1 , the portable electronic device enters a standby state, at this time, starts a replacement frame timer, and starts a picture display timer, wherein the time limit of the replacement frame timer is a replacement frame time T _A , and the time limit of the picture display timer is a picture display time T _B . Afterwards, the portable electronic device enters a state of waiting for an event. That is, the portable electronic device waits for various events to respond.

When the portable electronic device is in such a state of waiting for an event, different actions are processed according to various situations. When changing frame time _TA expires, as shown in event 120, this portable electronic device continuously displays one in these frames, and restarts this changing frame timer, to show these frames one by one; Like this, portable electronic device An animation composed of these frames can be displayed. When the frame display time T _B expires (that is, when the event 112 occurs), at the time point _t2 , the change frame timer is suspended (suspend), and the portable electronic device enters a power saving state. Wherein, if the portable electronic device adopts a liquid crystal display, the portable electronic device will turn off a corresponding backlight source to save energy. Of course, if the portable electronic device adopts other displays without a backlight, this problem need not be considered.

When the portable electronic device is in the power saving state, it also handles different actions according to various situations. When the portable electronic device receives an input interface event (user-interface event) and does not need to change the screen display (that is, when the event 114 occurs), for example, the input interface of the portable electronic device, such as a keyboard or a touch screen, just When touched, the portable electronic device resumes the change frame timer at the time point t ₃ , restarts the frame display timer, and enters such a state of waiting for an event.

When the change frame timer is paused, that is, between time points _t2 and _t3 , the portable electronic device does not process animation display actions. In Fig. 1, the dotted arrow (such as event 130) between the time point _t2 and _t3 represents the event that the replacement frame time T _A should have expired at this time, but because the replacement frame timer is suspended, the portable electronic device Actions about displaying another frame of these frames are not handled. Therefore, for example, processors of portable electronic devices can reduce power consumption.

When the above-mentioned portable electronic device receives an input interface event and does not need to change the screen display, resuming the replacement frame timer means that, for example, the replacement frame timer first uses the time difference between the replacement frame time T _A and the time a counted when it is suspended as the time difference. Timing period, that is, take T _A -a as the timing period to resume timing; when the timing period of T _A -a expires, the replacement frame timer is timed with the replacement frame time T _A (or other replacement frame time) The time limit continues to count, and the time a counted when it is suspended is less than the replacement frame time T _A . Therefore, when the animation makes the change frame timer resume and is played again, the period of time between adjacent frames has shrunk to T _A -a, so, as shown at the time point _t4 triggered The next frame will not be displayed after too long a delay. Therefore, after the processing action of the animation program is resumed, the response time of the animation display can be improved.

2 and 3 are flowcharts illustrating a preferred embodiment of a power management method for a portable electronic device according to the present invention, wherein the portable electronic device is a mobile phone. In this embodiment, the mobile phone displays an animation composed of a plurality of frames under certain preset conditions, for example, when it is idle. The mobile phone includes a display screen and corresponding backlight, a processor to execute an operating system, and a user input interface; the operating system provides a link library for the application software to call various functions to generate, for example, a timer functions, or control various hardware components such as backlights. In this embodiment, the power management of the mobile phone is realized through power management software.

From FIG. 2, as shown in step 210, the mobile phone enters an idle state. In step 220, a power management module starts a frame replacement timer, wherein the time limit of the frame replacement timer is a frame replacement time T _A . In step 230, the power management module starts a frame display timer, wherein the time limit of the frame display timer is a frame display time T _B . The replacement frame time T _A is shorter than the picture display time T _B , for example T _A =1.0 second, T _B =15 to 30 seconds. In addition, the frame replacement timer and the frame display timer can be started at the same time; another implementation method is: start the frame display timer first and then start the frame replacement timer. After that, as shown in step 240, the power management module enters into a waiting event state 240 (waiting event state). That is to say, the mobile phone is in the standby state, waiting to respond to various events that occur.

When the power management module is in such event-waiting state 240 , different actions will be processed according to various situations. As shown in step 250 , when the replacement frame time T _A expires, the power management module causes the portable electronic device to display one of these frames, as shown in step 260 . In step 270, the power management module restarts the change frame timer. In this way, the portable electronic device can display these frames one by one to achieve the animation display function. Afterwards, the power management module continues to be in such a waiting event state 240 .

In addition, as shown in step 280, when the frame display time T _B expires, the power management module enters step 290 to suspend the frame replacement timer. Additionally, step 290 may be implemented to occur synchronously with step 280 . Next, make the mobile phone enter a power saving state 300 (power saving state or suspend state), ie step 300 . This power management module will turn off the backlight of the mobile phone to save power.

In addition, when the power management module is in the event-waiting state 240 , that is, the mobile phone is in a standby state, waiting to respond to various events that occur. At this time, the mobile phone will also handle different actions according to various situations, that is to say, the processor of the mobile phone will still perform other tasks to maintain the operation of the mobile phone, such as receiving incoming calls or receiving short messages. When the mobile phone receives an input interface event and does not need to change the screen display, for example, when the input interface of the mobile phone, such as a keyboard or a touch screen is only touched, the power management module will restart the screen display timer, and then , the power management module returns to such a wait event state 240 . On the other hand, when the mobile phone receives an input interface event and needs to change the screen display, for example, when the mobile phone user enters a number or clicks a function from the input interface, the screen must be changed accordingly, such as displaying numbers or characters. For this reason, the power management module stops the picture display timer and the replacement frame timer, so as to stop the animation display. Then, end this power management module to enter other modules to handle such events that will change the screen display.

Please refer to FIG. 3 , when the power management module is in the power saving state 300 , it also handles different actions according to various situations. That is to say, the processor of the mobile phone will still perform other tasks to maintain the operation of the mobile phone, such as receiving incoming calls or receiving text messages. In step 310, when the mobile phone receives an input interface event and does not need to change the screen display, for example, when the input interface of the mobile phone, such as the keyboard or touch screen is only touched, the power management module will be updated (refresh) The picture is shown in step 320; wherein, the previously turned off backlight module will be turned on again. Next, in step 330, the change frame timer is resumed to display the animation. Thereafter, as shown in step 340 , the power management module restarts the picture display timer. Finally, the power management module returns to the waiting event state 240, that is, the mobile phone leaves the power saving state and returns to the standby state to wait for various events to be responded to. On the other hand, in step 350, when the mobile phone receives an input interface event and the screen display is to be changed, for example, when the mobile phone user inputs a number or clicks a function from the input interface, the screen must be changed accordingly, such as displaying a number or text etc. To this end, the power management module stops (stop) the picture display timer in step 360 to stop the animation display. Finally, end the power management module to enter other modules to handle such events that will change the screen display, as shown in step 370 .

When the change frame timer is paused, ie before step 330 is executed, the processor of the handset does not process the animation display. Therefore, the processor can reduce power consumption.

When the above-mentioned mobile phone receives an input interface event and does not need to change the screen display, resuming the replacement frame timer refers to: for example, the replacement frame timer first uses the time difference between the replacement frame time _TA and the time a when it is suspended as the time limit, That is, use T _A -a as the time limit to resume timing; when the time limit of T _A -a expires, the replacement frame timer takes the replacement frame time T _A (or other replacement frame time) as the time limit, and continues Timing, wherein the time a counted when it is suspended is less than the replacement frame time T _A . Therefore, when the animation is played again due to the recovery of the frame change timer, the period of time between adjacent frames has been shortened to T _A -a, so, for example, at time point _t4 in Figure 1 is triggered And the next frame displayed will not be displayed after too long a delay. Of course, besides the above-mentioned method, the power management module can restore the replacement frame timer in other ways. For example, the replacement frame timer first uses 1/2 of the replacement frame time T _A as the time limit, that is, T _A /2 is used as the timing period to resume timing; when the timing period of T _A /2 expires, the replacement frame timer uses the replacement frame time T _A (or other replacement frame time) as the timing period to continue counting. In this way, after the processing action of the animation program is resumed, the reaction time of the animation display can be reduced.

In addition, when the power management module is in such a waiting event state 240 , different actions will be processed according to various situations. In addition to the expiry event of the replacement frame time _TA as described in step 250 and the expiry event of the screen display time _TB as described in step 280, when the above-mentioned mobile phone receives an input interface event and does not need to change the screen display, If you accidentally touch the input interface, the power management module will start the display timer again, and recalculate when to enter the power saving state. At this time, the screen will continue to display animation. In addition, when the mobile phone receives an input interface event and needs to change the screen display, such as when the mobile phone user enters a number or clicks a function from the input interface, the screen must be changed accordingly, such as displaying numbers or characters. Therefore, the power management module stops (stops) the replacement frame timer and the screen display timer, and then, the power management module stops execution. Thereafter, other modules may be activated to handle such events that would change the screen display.

In another embodiment, the method steps of the power management method according to the present invention are added into the operating system or software program of the portable electronic device. When the portable electronic device is in a predetermined situation, such as standby, a frame display timer is activated. When the picture display timer expires, suspend other timers related to updating the picture display or touching the image processing to enter the power saving state (as shown in step 300), wherein these related to updating the picture display or touching the image processing operation The timer can be named as a picture update timer, and its time limit is a picture update time. Since the frame update timer triggers the portable electronic device to perform processing actions, when the frame refresh timer is suspended, the processor of the portable electronic device does not process the frame display action, thereby saving energy. For example, in the power-saving state, the portable electronic device can suspend information displayed in a carousel manner or operations requiring image processing, so as to reduce energy consumed by the portable electronic device during standby.

Furthermore, the portable electronic device may display a screen update action of an image sequence composed of a plurality of frames (frames) under certain preset conditions, for example, when it is on standby, for example, when it is a collection of pictures, a movie, or a presentation. Use the power management method of the present invention to save more energy for portable electronic devices.

Please refer to FIG. 4 , according to an embodiment of the portable electronic device of the present invention, the portable electronic device 400 includes a processor 410 and a memory 420 , and a display timer 460 . The memory 420 stores a plurality of program instructions, and the processor 410 is coupled to the memory 420 for executing the program instructions to perform the following actions. Start the picture display timer 460, wherein the time limit of the picture display timer 460 is one picture display time. When the time limit of the screen display timer expires, other timers related to updating the screen display or touching the image processing are suspended, such as the screen update timer 470 in FIG. 4 , to enter the power saving state (as shown in step 300 ).

If the frame update time expires, the processor 410 performs an image processing operation to display the result of the image processing operation, and restarts the frame update timer. If the screen display time expires, the screen update timer 470 is suspended. During the above process, when the frame update timer 470 is suspended, the processor 410 does not perform relative image processing operations, so as to reduce the power consumption of the portable electronic device 400 . Furthermore, the portable electronic device 400 may further include a backlight 490 , and when the frame update timer 470 is suspended, the processor 410 turns off the backlight 490 to further save energy. The power management methods disclosed in the above embodiments of the present invention can also be implemented in the portable electronic device shown in FIG. 4 . In addition, as shown in FIG. 4 , the screen display timer 460 and the screen update timer 470 are realized by circuits. However, in another embodiment, one or both of the frame display timer 460 and the frame update timer 470 are implemented in the form of software instructions. It should be noted that the activation sequence of the frame display timer 460 and the frame update timer 470 may be simultaneously or in different order.

For colorful portable electronic devices, such as color mobile phones, most of the time in a day is in the standby state. The above-mentioned animation action) is brought into the control range of power management, so that the mobile phone can save more energy, and improve the reaction time after the processing action of the program is resumed. In contrast, because the known power management method does not consider the processing actions of the programs being executed by the mobile phone, the power management method of the present invention can save more energy for the mobile phone.

The above embodiments of the present invention disclose a power management method for a portable electronic device of the present invention, so as to reduce the power consumption of the portable electronic device when playing animation; in addition, when the portable electronic device returns to the standby state from the power saving state, The response time of the image display is improved to produce a smooth display. Therefore, the standby time of the portable electronic device will increase, and the user will give a positive evaluation to the portable electronic device. The competitiveness of the product will thus be enhanced.

In summary, although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention, and any person skilled in the art can make various changes without departing from the spirit and scope of the present invention Therefore, the protection scope of the present invention shall prevail as defined by the appended claims.

Claims (27)

1. the method for managing power supply of a portable electron device, wherein this portable electron device shows the image sequence of being made up of a plurality of frames, this method comprises:

When this portable electron device enters a holding state:

Start one and change frame timer, wherein the timing time limit of this replacing frame timer is a replacing frame time;

Start a picture Displaying timer device, wherein the timing time limit of this picture Displaying timer device is that a picture shows the time;

When this portable electron device is in this holding state:

When the replacing frame time expired, this portable electron device showed the frame in these frames, and restarts this replacing frame timer, to show these frames seriatim;

When the picture demonstration time expires, suspend and change frame timer, and enter a power down mode;

Wherein, when the replacing frame timer was suspended, this portable electron device was not handled the display action of image sequence, to reduce the energy consumption of this portable electron device.

2. method for managing power supply as claimed in claim 1, wherein when this portable electron device is in power down mode:

When this portable electron device receives an inputting interface incident and need not change screen display, recover this replacing frame timer, and start this picture Displaying timer device, wherein this portable electron device is returned to holding state from power down mode.

3. method for managing power supply as claimed in claim 2, wherein, in the described step when this portable electron device receives the inputting interface incident and need not change screen display:

Change frame timer at first when changing frame time and and be suspended time difference of time as the timing time limit, with the recovery timing, the time of being counted when wherein being suspended is changed frame time less than this.

4. method for managing power supply as claimed in claim 2, wherein, in the described step when this portable electron device receives the inputting interface incident and need not change screen display:

Change frame timer at first with one less than this time of changing frame time as the timing time limit, recover timing.

5. method for managing power supply as claimed in claim 2 wherein, also comprises in the described step when this picture demonstration time expires:

The backlight that is used to show of turning off this portable electron device.

6. method for managing power supply as claimed in claim 5 wherein, also comprises in the described step when this portable electron device receives the inputting interface incident and need not change screen display:

Reopen backlight.

7. method for managing power supply as claimed in claim 1, wherein when this portable electron device is in power down mode:

When this portable electron device receives an inputting interface incident and must change screen display, stop to change frame timer.

8. method for managing power supply as claimed in claim 1, wherein when this portable electron device is in holding state:

When this portable electron device receives an inputting interface incident and need not change screen display, restart picture Displaying timer device.

9. method for managing power supply as claimed in claim 1, wherein when this portable electron device is in holding state:

If when this portable electron device receives an inputting interface incident and must change screen display, stop to change frame timer and picture Displaying timer device.

10. method for managing power supply as claimed in claim 1 wherein, is changed frame time and is shown the time less than picture.

11. a portable electron device comprises:

One memory stores a plurality of program command; And

One processor couples with this memory, in order to carry out these program command, to carry out following at least action:

Start a frame updating timer, wherein the timing time limit of this frame updating timer is the frame updating time;

Start a picture Displaying timer device, wherein the timing time limit of this picture Displaying timer device is that a picture shows the time;

When this frame updating time expired, processor carried out an image processing computing showing the result of this image processing computing, and restarts the frame updating timer;

When this picture demonstration time expires, suspend the frame updating timer;

Wherein, when the frame updating timer was suspended, processor did not carry out this image processing computing, to reduce the energy consumption of this portable electron device.

12. portable electron device as claimed in claim 11, wherein when this picture demonstration time expired, after the frame updating timer was suspended, processor was more carried out following action:

In response to an inputting interface incident and need not change screen display the time, recover the frame updating timer, and start picture Displaying timer device.

13. portable electron device as claimed in claim 12, wherein, this processor is carried out in response to the inputting interface incident and need not change the action of screen display the time:

The frame updating timer at first with one less than time of this frame updating time as the timing time limit, recover timing.

14. portable electron device as claimed in claim 12 also comprises a backlight, when wherein expiring as if the picture demonstration time, the frame updating timer is suspended, and processor is also carried out following action:

Turn off this backlight.

15. portable electron device as claimed in claim 14, wherein, processor carries out in response to the inputting interface incident and need not change the action of screen display the time, this processor is also carried out following action:

Reopen this backlight.

16. portable electron device as claimed in claim 11, when wherein expiring as if this picture demonstration time, after the frame updating timer was suspended, processor was also carried out following action:

During in response to an inputting interface incident and necessary change screen display, stop the frame updating timer.

17. portable electron device as claimed in claim 11, wherein after picture Displaying timer device was activated, processor was also carried out following action:

In response to an inputting interface incident and screen display need not be changed the time, restart picture Displaying timer device.

18. portable electron device as claimed in claim 11, wherein after picture Displaying timer device was activated, processor was also carried out following action:

During in response to an inputting interface incident and necessary change screen display, stop frame updating timer and picture Displaying timer device.

19. portable electron device as claimed in claim 11 also comprises a backlight, when wherein expiring as if the picture demonstration time, the frame updating timer is suspended, and processor is also carried out following action:

Turn off this backlight.

20. portable electron device as claimed in claim 11, wherein the frame updating time shows the time less than picture.

21. the method for managing power supply of a portable electron device, this method comprises:

Start a frame updating timer, wherein the timing time limit of this frame updating timer is the frame updating time;

Start a picture Displaying timer device, wherein the timing time limit of this picture Displaying timer device is that a picture shows the time;

When this frame updating time expired, this portable electron device carried out an image processing computing and shows the result of this image processing computing, and restarts this frame updating timer;

When this picture demonstration time expires, suspend this frame updating timer;

Wherein, when the frame updating timer was suspended, this portable electron device did not carry out the image processing computing, to reduce the energy consumption of this portable electron device.

22. method for managing power supply as claimed in claim 21, wherein when this picture demonstration time expires, after the frame updating timer is suspended:

When this portable electron device receives an inputting interface incident and need not change screen display, recover the frame updating timer, and start picture Displaying timer device.

23. method for managing power supply as claimed in claim 22, wherein, in the described step when this portable electron device receives this inputting interface incident and need not change screen display:

When the frame updating timer at first is suspended in this frame updating time and one time difference of time as the timing time limit, to recover timing, the time of being counted when wherein being suspended is less than the frame updating time.

24. method for managing power supply as claimed in claim 22, wherein, in the described step when this portable electron device receives this inputting interface incident and need not change screen display:

The frame updating timer at first with one less than time of this frame updating time as the timing time limit, recover timing.

25. method for managing power supply as claimed in claim 21, wherein when this picture demonstration time expires, after this frame updating timer is suspended:

When this portable electron device receives an inputting interface incident and must change screen display, stop the frame updating timer.

26. method for managing power supply as claimed in claim 21, wherein after this picture Displaying timer device is activated:

When this portable electron device receives an inputting interface incident and need not change screen display, restart picture Displaying timer device.

27. method for managing power supply as claimed in claim 21, wherein after this picture Displaying timer device is activated:

When this portable electron device receives an inputting interface incident and must change screen display, stop frame updating timer and picture Displaying timer device.

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