WO2013004040A1

WO2013004040A1 - Method and device for saving power of mobile terminal

Info

Publication number: WO2013004040A1
Application number: PCT/CN2011/078584
Authority: WO
Inventors: 张康; 高建波; 张庆治
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-07-01
Filing date: 2011-08-18
Publication date: 2013-01-10
Also published as: CN102857643A

Abstract

Provided are a method and device for saving power of a mobile terminal. The method includes: in a screen power-saving mode, acquiring a bitmap in a screen buffer of a mobile terminal; zooming out the bitmap in the screen buffer according to a pre-set scale; determining a display area of the screen according to the zooming-out scale of the screen resolution in the screen power-saving mode; and on the screen turning off the screen pixel points and/or backlight leaving the display area. The technical solution provided by the present invention can save the electricity consumption of a mobile terminal screen, and prolong the service time of a mobile terminal in a low-battery state.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a power saving method and apparatus for a mobile terminal. BACKGROUND OF THE INVENTION As users' demands for entertainment performance of mobile terminals (e.g., mobile phones) continue to increase, the screens of mobile terminals are getting larger and larger. On the mobile terminal, almost all functions are inseparable from the display of the screen, and a large part of the power of the mobile terminal is consumed on the screen. The power consumption of large-screen mobile terminals is quite large, and most mobile terminals are charged every day. When the user is outdoors and inconvenient to charge, it is desirable to switch to the power saving mode when the battery is low, and the mobile terminal screen maintains the basic display function and maintains contact with the outside world. In the related art, the conventional power saving technology is: when the mobile terminal is low-powered, the battery is switched from the power supply for the mobile terminal to the power supply function of only the mobile terminal to save power, for example, when the mobile phone is low-powered, the camera is turned off. , audio and video entertainment modules. However, the traditional mobile terminal power saving technology cannot effectively save the power consumption of the screen, and the power saving effect is limited for the large screen mobile phone. Patent application No. CN200810113765.0, discloses a mobile phone power saving method and device, the power saving method includes: detecting the remaining battery power of the mobile phone in real time; and performing the detected remaining power with a preset power threshold Comparing; when the remaining power is lower than the power threshold, the mobile phone battery is switched from the power supply for the mobile phone to only the function of the mobile phone. The power saving device includes: a remaining power detecting unit, configured to detect a remaining battery power of the mobile phone battery in real time; and a power threshold comparing unit, configured to compare the detected remaining power with a preset power threshold; If the remaining power is lower than the power threshold, the mobile phone battery is switched from the power supply for the mobile phone to only the function of the mobile phone. Through the above power saving scheme, the standby time of the mobile phone can be extended, and the power consumption of the mobile phone can be reduced. However, the above power saving scheme cannot save power consumption on the screen of a mobile terminal (for example, a mobile phone), and has certain limitations, and the limitation of the large screen mobile phone is particularly obvious. SUMMARY OF THE INVENTION The present invention provides a power saving method and apparatus for a mobile terminal to solve at least one of the above problems, in view of the problem in the related art that the power consumption on the screen of the mobile terminal cannot be saved. According to an aspect of the present invention, a power saving method of a mobile terminal is provided. The power saving method of the mobile terminal according to the present invention includes the following processes: acquiring a bitmap in a screen buffer of the mobile terminal in the screen power saving mode; reducing a bitmap in the screen buffer according to a preset ratio; saving power according to the screen The screen resolution reduction ratio in mode determines the display area of the screen; turns off screen pixels and/or backlights in the screen other than the display area. Before obtaining the bitmap in the screen buffer of the mobile terminal, the method further includes: comparing the current power of the mobile terminal with a preset low power threshold to determine that the mobile terminal is in a low power state; determining to enable the screen power saving mode according to the preset configuration. . The above-mentioned reduction of the bitmap according to the preset ratio includes: scanning the bitmap in the screen buffer progressively; selecting the X rows of the bitmap in the screen buffer to form a new bitmap, wherein X is smaller than the bitmap in the screen buffer The total number of rows; the new bitmap is scanned column by column; the Y column of the new bitmap is selected to form a reduced bitmap, where Y is smaller than the total number of columns of the bitmap in the screen buffer. The X rows of the bitmap in the selected screen buffer form a new bitmap including: selecting an odd row or an even row of the bitmap in the screen buffer to form a new bitmap; selecting the Y column of the new bitmap to form a reduced bitmap The bitmap includes: Selecting an odd or even column of the new bitmap to form a reduced bitmap. After turning off the screen pixels and/or the backlight outside the display area in the screen, the method further includes: adjusting the cut area of the screen refresh and refreshing the screen. After the screen pixel and/or the backlight in the screen is turned off, the method further includes: detecting the current power of the mobile terminal; and turning off the screen power saving mode when the detected current power is higher than the low power threshold. According to an aspect of the present invention, a power saving device for a mobile terminal is provided. The power saving device of the mobile terminal according to the present invention includes: an obtaining module configured to acquire a bitmap in a screen buffer of the mobile terminal in a screen power saving mode; and a processing module configured to reduce the screen buffer according to a preset ratio The first determining module is configured to determine the display area of the screen according to the screen resolution reduction ratio in the screen power saving mode; the closing module is set to turn off the screen pixels and/or the backlight in the screen except the display area. The device further includes: a second determining module, configured to compare the current power of the mobile terminal with a preset low power threshold to determine that the mobile terminal is in a low power state; and enable the module, and set to enable the screen power saving according to the preset configuration. mode. The processing module includes: a first scanning unit configured to scan a bitmap in a screen buffer; a first group of graphics units, configured to select a X row of a bitmap in the screen buffer to form a new bitmap, where X is smaller than the total number of rows in the bitmap buffer; the second scanning unit is set to scan a new bitmap; the second group of graphics units, The Y column set to select a new bitmap constitutes a reduced bitmap, where Υ is smaller than the total number of columns of the bitmap in the screen buffer. The above device further comprises: an adjustment module, configured to adjust a cutting area of the screen refresh; and a refresh module, configured to refresh the screen. The invention maintains the basic display function of the mobile terminal by reducing the screen resolution of the mobile terminal, and solves the problem that the power consumption on the screen of the mobile terminal cannot be saved in the related art, thereby saving power consumption on the screen of the mobile terminal and prolonging the movement. The usage time of the terminal in the low power state. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a flowchart of a power saving method of a mobile terminal according to an embodiment of the present invention; FIG. 2 is a flowchart of a power saving mode setting method of a mobile terminal according to a preferred embodiment of the present invention; FIG. 4 is a flowchart of a method for adjusting a screen resolution of a mobile terminal according to a preferred embodiment of the present invention; FIG. 5 is a screen of a mobile terminal according to a preferred embodiment of the present invention; FIG. 6 is a flowchart of a method for reducing a screen bitmap of a mobile terminal according to a preferred embodiment of the present invention; FIG. 7 is a diagram showing a display effect after a screen resolution of a mobile terminal is reduced according to a preferred embodiment of the present invention; 8 is a schematic diagram of refreshing a cutting area map after a screen resolution of a mobile terminal is reduced according to a preferred embodiment of the present invention; FIG. 9 is a structural block diagram of a power saving apparatus for a mobile terminal according to an embodiment of the present invention; FIG. 10 is a preferred embodiment according to the present invention. A block diagram of a mobile terminal power saving device. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. 1 is a flow chart of a power saving method of a mobile terminal according to an embodiment of the present invention. As shown in FIG. 1 , the mobile terminal power saving method mainly includes the following processes: Step S102: Obtain a bitmap in a screen buffer of the mobile terminal in a screen power saving mode; Step S104: Reduce the screen buffer according to a preset ratio. a bitmap in the screen; Step S106: determining a display area of the screen according to a screen resolution reduction ratio in the screen power saving mode; Step S108: Turn off screen pixel points and/or backlights in the screen other than the display area. In the related art, the power consumption of the screen cannot be effectively saved, which is limited in power saving for a large-screen mobile phone. The power saving method shown in FIG. 1 is adopted to maintain the basic display function of the mobile terminal by reducing the screen resolution of the mobile terminal, thereby solving the problem that the power consumption on the screen of the mobile terminal cannot be saved in the related art, thereby saving the screen of the mobile terminal. The power consumption increases the usage time of the mobile terminal in a low power state. Preferably, before acquiring the bitmap in the screen buffer of the mobile terminal, the following processing may be further included: (1) comparing the current power of the mobile terminal with a preset low power threshold, and determining that the mobile terminal is in a low power state;

(2) Determine the enable screen power save mode according to the preset configuration. Through the above processing, enabling the screen power saving mode in the low power state can effectively slow down the power consumption of the mobile terminal and prolong the use time of the mobile phone in the low power state. In a preferred implementation process, before the screen of the mobile terminal is refreshed, it is generally determined whether the mobile terminal is in a low power state, and if in a low power state, the bitmap size in the display screen buffer may be reduced according to a preset ratio, according to the reduced size. The bitmap size reduces the screen resolution and achieves the power saving effect of the mobile terminal. The preset configuration may be a configuration of whether the mobile power saving mode is activated when the mobile terminal is set in a low power state, and the screen power saving mode identifier LOW_POWER_MODEL is saved if the mobile phone screen power saving mode is automatically enabled when the user selects low power. The phone screen power save mode is not activated when the power is low. The low power threshold may also be set and modified in response to user operations. If the low power threshold is set and modified, the low power threshold LOW_POWER_THRESHOD needs to be saved, otherwise the default value is used. The preset ratio may also be set and modified in response to a user operation. If the preset ratio is set and modified (ie, the ratio of the resolution in the power saving mode of the mobile terminal to the original screen resolution), the preset needs to be saved. Set the ratio LOW_POWER_RESOL_RATIO, otherwise use the default value. The above preferred embodiments are further described below in conjunction with FIG. 2. 2 is a flow chart of a method for setting a power saving mode of a mobile terminal (taking a mobile phone as an example) according to a preferred embodiment of the present invention. As shown in FIG. 2, the mobile terminal power-saving mode setting method includes the following processing: Step S202: In response to a user operation, setting whether the mobile phone screen power-saving mode is automatically enabled in a low-power state of the mobile phone, if the user selects to automatically enable the mobile phone screen to save power. The mode saves the screen power saving mode identifier LOW_POWER_MODEL, otherwise the setting is ended, and the mobile phone screen power saving mode is not activated when the power is low; Step S204: Determine whether the user selects the low power threshold, and if yes, save the low power threshold LOW_POWER THRESHOD, otherwise use The default value ends the setting process; Step S206: Determine whether the user selects the resolution in the mobile phone screen power saving mode, and if so, saves the ratio of the resolution in the mobile phone screen power saving mode to the original screen resolution LOW_POWER_RESOL_RATIO, otherwise the default value is used. End the process. Step S208: Save the set LOW_POWER_MODEL, LOW_POWER_THRESHOD and LOW_POWER_RESOL_RATIO. 3 is a flow chart of a method for starting a screen power save mode of a mobile terminal (taking a mobile phone as an example) according to a preferred embodiment of the present invention. As shown in FIG. 3, the mobile terminal screen power saving mode starting method mainly includes the following processing: Step S302: determining that the current power value CURRENT_POWER of the mobile phone changes; Step S304: reading the low power threshold LOW_POWER_THRESHOD of the mobile phone, comparing CURRENT POWER with LOW_POWER_THRESHOD, If the LOW POWER THRESHOD is greater than CURRENT_POWER, it is determined that the mobile phone is in a low power state to continue the startup process of the mobile phone screen power saving mode, otherwise the flow is directly ended; Step S306: Read the setting screen power saving mode identifier LOW_POWER_MODEL, if LOW_POWER MODEL is true, continue The mobile phone screen power saving mode starts the process, otherwise the process is directly ended; Step S308: The mobile phone issues a warning, pops up a prompt message, prompts the user the remaining battery power of the mobile phone, asks the user whether the mobile phone screen starts the power saving mode of the mobile phone, and the user confirms, then starts the mobile phone screen power saving mode, otherwise the process ends; Step S310: Start the mobile phone screen Power saving mode, ending the process. Preferably, in step S104, the foregoing reducing the bitmap according to the preset ratio may include:

(1) progressively scan the bitmap in the screen buffer;

(2) Selecting the X rows of the bitmap in the screen buffer to form a new bitmap, where X is smaller than the total number of rows of the bitmap in the screen buffer; preferably, the odd rows of the bitmap in the screen buffer can be selected Or even lines form a new bitmap. Image separation can be effectively prevented by interlacing. Of course, other lines can also be selected according to a preset algorithm to form a new bitmap.

(3) scanning the above new bitmaps column by column;

(4) Select the Y column of the above new bitmap to form a reduced bitmap, where Y is smaller than the total number of columns in the bitmap buffer. Preferably, the odd-numbered column or the even-numbered column of the above new bitmap may be selected to constitute the reduced bitmap. Image separation can also effectively prevent image distortion. Of course, other columns can also be selected according to a preset algorithm to form a new bitmap. Preferably, after performing step S108, the following processing may also be included: adjusting the cut area of the screen refresh and refreshing the screen. The cutting area of the screen refresh is the area refreshed on the screen. After the screen resolution is adjusted, the cutting area needs to be adjusted, and the cutting area refreshed by the original screen can be mapped to the cutting area after the resolution adjustment. Preferably, after the screen pixels and/or the backlight other than the display area are turned off in the screen, the following processing may also be included:

(1) detecting the current power of the mobile terminal; (2) When the detected current power is higher than the low power threshold, the screen power save mode is turned off, that is, the screen is restored to the normal resolution. Through the above processing, the mobile terminal with higher power can better present the screen image to the user, and the mode switching greatly improves the user experience. The above preferred embodiments are further described below in conjunction with FIGS. 4 through 6. 4 is a flow chart of a method for adjusting a screen resolution of a mobile terminal (taking a mobile phone as an example) according to a preferred embodiment of the present invention. As shown in FIG. 4, the mobile terminal screen resolution adjustment method mainly includes the following processing (steps S402-S416): Step S402: The upper layer software of the mobile phone calls draw to input data into the buffer of the screen; Step S404: Determine whether the mobile phone is In the mobile phone screen power saving mode, if yes, continue the mobile phone screen resolution adjustment process, otherwise directly go to step S416; Step S406: obtain a bitmap in the mobile phone screen buffer; Step S408: Read the mobile phone screen power saving mode The reduction ratio of the resolution is LOW POWER RESOL RATIO. In the following flow, the value of LOW_POWER_RESOL_RATIO is 0.5 as an example to describe the screen resolution adjustment process of the mobile phone; Step S410: The bitmap A in the screen buffer of the mobile phone is reduced, and the process is shown in the figure. As shown in FIG. 5, assuming that the bitmap size is MN, step S412: determining the screen display area range according to the reduced scale value LOW_POWER RESOL RATIO of the resolution in the power saving mode of the mobile phone screen, by modifying the position of the LCD related register setting on the screen and Area, close the screen pixels and/or backlight outside the area, the effect is shown in Figure 7. The shaded area shown in FIG. 7 is an area where the screen pixels and/or the backlight are turned off; of course, in the specific implementation, if the screen pixels and the backlight outside the area are simultaneously turned off, the power consumption on the screen of the mobile phone can be further saved. . Step S414: The cut area of the screen refresh is the area refreshed on the screen, and the cut area needs to be adjusted after the screen resolution is adjusted, assuming that the range of the cut area of the original screen refresh is (x, y, dx, dy), where x is horizontal The starting position of the direction, y is the starting position in the vertical direction, dx is the width, dy is the height, and the range of the cutting area mapped to the resolution adjustment is (x/2, y/2, dx/2, dy/ 2), the cutting area mapping diagram is shown in Figure 8; Step S416: Refresh the mobile phone screen. In a preferred implementation process, as shown in FIG. 6, the foregoing step S410 may further include the following steps: Step S602: Scan the bitmap A in the screen buffer of the mobile phone by row; Step S604: Select the even-numbered row to form a new bitmap B. , the bitmap size is Μ χ N/2; Step S606: Scan the bitmap B in the screen buffer of the mobile phone by column; Step S608: Select the even-numbered column to form a new bitmap C, the bitmap size is Μ/2 χ Ν /2. FIG. 9 is a structural block diagram of a power saving device for a mobile terminal according to an embodiment of the present invention. As shown in FIG. 9, the mobile terminal power saving device includes: an obtaining module 10, configured to acquire a bitmap in a screen buffer of the mobile terminal in a screen power saving mode; and the processing module 20 is configured to be reduced according to a preset ratio. a bitmap in the screen buffer; the first determining module 30 is configured to determine a display area of the screen according to a screen resolution reduction ratio in the screen power saving mode; and the closing module 40 is configured to close a screen pixel other than the display area in the screen Point and / or backlight. In the power saving device shown in FIG. 9, the basic display function of the mobile terminal is maintained by reducing the screen resolution of the mobile terminal, which solves the problem that the power consumption on the screen of the mobile terminal cannot be saved in the related art, thereby saving the screen of the mobile terminal. The power consumption on the battery extends the use time of the mobile terminal in a low power state. Preferably, as shown in FIG. 10, the apparatus further includes: a second determining module 50 configured to compare a current power level of the mobile terminal with a preset low power threshold to determine that the mobile terminal is in a low power state; Connected between the second determining module 50 and the obtaining module 10, and configured to determine to enable the screen power saving mode according to the preset configuration. Preferably, as shown in FIG. 10, the processing module 20 may further include: a first scanning unit 200 configured to scan a bitmap in a progressive scan screen buffer; a first set of graphics unit 202, configured to select a screen buffer The X rows of the bitmap constitute a new bitmap, where X is smaller than the total number of rows of the bitmap in the screen buffer; the second scanning unit 204 is set to scan a new bitmap; the second group of graphics units 206 is set to The queue of the new bitmap is selected to form a reduced bitmap, where Υ is smaller than the total number of columns of the bitmap in the screen buffer. Preferably, as shown in FIG. 10, the apparatus may further include: an adjustment module 70 connected to the shutdown module 40, configured to adjust a cutting area of the screen refresh; and a refreshing module 80 configured to refresh the screen. In a preferred implementation process, when the mobile terminal is in the screen power saving mode, a charging event is detected, or the current power is higher than a low power threshold set by the user. For example, if the user replaces the battery, the screen power saving mode may be turned off. The mobile terminal returns to normal mode and the screen returns to normal resolution. It should be noted that the above power saving device may be disposed in the mobile terminal. In summary, with the above embodiment provided by the present invention, before the screen of the mobile phone is refreshed, it is determined whether the mobile phone is in a low power state, and if so, the bitmap size in the display screen buffer is reduced according to a preset ratio, according to the reduction The bitmap size reduces the screen resolution, which can effectively reduce the power consumption of the mobile phone and prolong the use time of the mobile phone in a low power state. For a mobile terminal with a large screen, a better power saving effect can be achieved. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device so that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A power saving method for a mobile terminal, comprising:

Obtaining a bitmap in a screen buffer of the mobile terminal in the screen power saving mode;

Shrinking the bitmap in the screen buffer by a preset ratio;

The display area of the screen is determined according to the screen resolution reduction ratio in the screen power saving mode; the screen pixels and/or the backlight in the screen other than the display area are turned off.

2. The method according to claim 1, wherein before acquiring the bitmap in the screen buffer of the mobile terminal, the method further comprises:

Comparing the current power of the mobile terminal with a preset low power threshold to determine that the mobile terminal is in a low power state;

The screen power saving mode is determined to be enabled according to a preset configuration.

The method according to claim 1, wherein the reducing the bitmap according to a preset ratio comprises: scanning a bitmap in the screen buffer line by line;

Selecting X rows of the bitmap in the screen buffer to form a new bitmap, where X is smaller than the total number of rows of the bitmap in the screen buffer;

Scanning the new bitmap column by column;

The Y column of the new bitmap is selected to form the reduced bitmap, where Y is less than the total number of columns of the bitmap in the screen buffer.

4. The method according to claim 3, wherein selecting the X rows of the bitmap in the screen buffer to form a new bitmap comprises: selecting an odd row or an even row of the bitmap in the screen buffer New bitmap;

Selecting the Y column of the new bitmap to form the reduced bitmap includes: selecting an odd or even column of the new bitmap to form the reduced bitmap.

5. The method according to claim 1, wherein, after turning off screen pixel points and/or backlights other than the display area in the screen, further comprising: adjusting a screen refreshed cut area and refreshing the screen . The method according to any one of claims 1 to 5, wherein, after the screen pixels and/or the backlight in the screen except the display area are turned off, the method further includes:

Detecting a current power of the mobile terminal;

The screen power save mode is turned off when the detected current power is higher than the low power threshold. A power saving device for a mobile terminal, comprising:

Obtaining a module, configured to obtain a bitmap in a screen buffer of the mobile terminal in the screen power saving mode;

a processing module, configured to reduce the bitmap in the screen buffer according to a preset ratio; the first determining module is configured to determine a display area of the screen according to a screen resolution reduction ratio in the screen power saving mode;

The module is turned off, and is set to turn off screen pixels and/or backlights in the screen other than the display area. The device according to claim 7, further comprising: a second determining module, configured to compare a current power of the mobile terminal with a preset low power threshold, and determine that the mobile terminal is in a low power state;

The module is enabled, and is set to determine to enable the screen power saving mode according to a preset configuration. The device according to claim 7 or 8, wherein the processing module comprises:

a first scanning unit, configured to scan a bitmap in the screen buffer line by line;

a first set of map units, configured to select a X row of the bitmap in the screen buffer to form a new bitmap, where X is smaller than a total number of rows of the bitmap in the screen buffer;

a second scanning unit, configured to describe the new bitmap;

The second set of picture elements, arranged to select the Y column of the new bitmap, constitutes the reduced bitmap, wherein Y is smaller than the total number of columns of the bitmap in the screen buffer. The apparatus according to claim 7 or 8, further comprising: an adjustment module configured to adjust a cutting area of the screen refresh;

Refresh the module, set to refresh the screen.