WO2016029640A1 - 一种背光亮度的控制方法及装置 - Google Patents

一种背光亮度的控制方法及装置 Download PDF

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Publication number
WO2016029640A1
WO2016029640A1 PCT/CN2015/071357 CN2015071357W WO2016029640A1 WO 2016029640 A1 WO2016029640 A1 WO 2016029640A1 CN 2015071357 W CN2015071357 W CN 2015071357W WO 2016029640 A1 WO2016029640 A1 WO 2016029640A1
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WO
WIPO (PCT)
Prior art keywords
backlight
target
group
current
brightness value
Prior art date
Application number
PCT/CN2015/071357
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English (en)
French (fr)
Inventor
李国盛
刘安昱
冯炜
Original Assignee
小米科技有限责任公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 小米科技有限责任公司 filed Critical 小米科技有限责任公司
Priority to JP2016544715A priority Critical patent/JP6293909B2/ja
Priority to MX2015013652A priority patent/MX350740B/es
Priority to RU2015144369A priority patent/RU2634743C2/ru
Priority to BR112015026104A priority patent/BR112015026104A2/pt
Priority to KR1020157026696A priority patent/KR101735987B1/ko
Priority to US14/710,614 priority patent/US9691332B2/en
Publication of WO2016029640A1 publication Critical patent/WO2016029640A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0238—Improving the black level
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness

Definitions

  • the present invention relates to the field of communication technologies, and more particularly to a method and apparatus for controlling backlight brightness.
  • the related art since the current supplied by the control chip of the terminal to the backlight is proportional to the brightness emitted by the backlight, the related art generally adopts a method for reducing the supply current of the backlight of the smart device in order to enable the backlight of the smart device to achieve lower brightness. .
  • the signal-to-noise ratio of the control chip for supplying current to the backlight will be very low when the supply current of the backlight is reduced to a certain degree.
  • the control chip is greatly affected by external noise, so that when the user sets a fixed extremely low brightness to the smart device, the control chip of the smart device may be interfered by external noise, and the backlight outputted by the control chip is controlled.
  • Current may be unstable.
  • the backlight receives an unstable supply current, the brightness of the backlight will continuously flash as the output current of the control chip changes, so the brightness of the backlight will not remain at that fixed low brightness.
  • the backlight of the smart device will not only reduce the user's feeling of use when the backlight is blinking at low brightness, but also the backlight will work in an unstable current, which will reduce the life of the backlight.
  • the present disclosure provides a method and a device for controlling backlight brightness, so that the backlight of the smart device stably emits light of extremely low brightness.
  • a method of controlling backlight brightness the method being applied to the terminal, the terminal comprising a first backlight group and a second backlight group, the first backlight
  • the light group and the second backlight group each include a plurality of backlights, the terminals providing current for the backlight of the first backlight group and the backlight of the second backlight group, the method comprising :
  • the method further includes:
  • the method further includes:
  • the method further includes:
  • Determining that the backlight of the first backlight group reaches the target when the current brightness value and the target brightness value are both smaller than a first threshold and current is only supplied to the backlight of the first backlight group The target current value required for the luminance value, and the target current value is provided for the backlight of the first backlight group.
  • the method before the stopping the supply of current to the backlight of the first backlight group, the method further includes:
  • a device for controlling brightness of a backlight includes:
  • each of the first backlight group and the second backlight group includes a plurality of backlights
  • a receiving module configured to receive a control instruction for adjusting a current brightness value to a target brightness value
  • a first execution module configured to stop supplying current to the backlight of the first backlight group, and determine the second backlight when the current brightness value is greater than a first threshold and the target brightness value is less than a first threshold
  • the backlight of the lamp set reaches a target current value required for the target brightness value, and the target current value is provided for the backlight of the second backlight group.
  • the device further includes:
  • a second execution module configured to determine a backlight of the first backlight group and the second backlight when the current brightness value is less than the second threshold and the target brightness value is greater than the second threshold
  • the backlights of the lamp group collectively reach a target current value required for the target brightness value, and simultaneously provide the target current value for the backlight of the first backlight group and the backlight of the second backlight group.
  • the second threshold is greater than or equal to the first threshold.
  • the device further includes:
  • a third execution module configured to determine that the backlight of the first backlight group and the backlight of the second backlight group are jointly reached when the current brightness value and the target brightness value are both greater than a first threshold The target current value required by the target brightness value, and simultaneously providing the target current value for the backlight of the first backlight group and the backlight of the second backlight group.
  • the device further includes:
  • a fourth execution module configured to determine the first backlight group when the current brightness value and the target brightness value are both smaller than a first threshold and current is only provided by the backlight of the first backlight group The backlight reaches a target current value required for the target brightness value, and provides the target current value for the backlight of the first backlight group.
  • the device further includes:
  • a first determining module configured to respectively determine a first total working time of the first backlight group and a second total working time of the second backlight group;
  • a first determining module configured to determine whether the first total working time is greater than the second total working time
  • a fifth execution module configured to execute the first execution module when the first total working time is greater than the second total working time; and the second total working time is less than or equal to the second total working time Stopping the supply of current to the backlight of the second backlight group, determining a target current value required for the backlight of the first backlight group to reach the target brightness value, and determining the first backlight A set of backlights provides the target current value.
  • a device for controlling brightness of a backlight includes:
  • a memory for storing processor executable instructions
  • processor is configured to:
  • the backlight of the light group provides a current, determines a target current value required for the backlight of the second backlight group to reach the target brightness value, and provides the target current for the backlight of the second backlight group value.
  • the technical solution provided by the embodiment of the present disclosure may include the following beneficial effects: when the target luminance value is less than the first threshold, only the backlight of the second backlight group is provided with the target current value, and the backlight of the first backlight group is stopped.
  • the lamp provides current. Since the backlight of the first backlight group does not emit light, it is necessary to increase the target current value of the backlight provided to the second backlight group to compensate for the lack of brightness caused by the backlight of the first backlight group not being illuminated. The interference of external noise received due to the supply current value being too small is avoided, so the solution provided by the present disclosure can make the backlight stably emit light of extremely low brightness.
  • FIG. 1 is a flow chart showing a method of controlling backlight brightness according to an exemplary embodiment.
  • FIG. 2 is a schematic diagram of a control device for backlight brightness, according to an exemplary embodiment.
  • FIG. 3 is a block diagram of a control device for backlight brightness, according to an exemplary embodiment.
  • FIG. 1 is a flowchart of a method for controlling brightness of a backlight according to an exemplary embodiment.
  • a method for controlling backlight brightness shown in FIG. 1 may be used in a terminal, and the terminal may include a backlight group and a second backlight group, the first backlight group and the second backlight group each include a plurality of backlights, the terminal is a backlight of the first backlight group and a backlight of the second backlight group Provide current.
  • the method for controlling the brightness of the backlight provided by the present disclosure can make the backlight stably emit light of extremely low brightness. The method includes the following steps.
  • step S11 a control command to adjust the current brightness value to the target brightness value is received.
  • the first backlight group and the second backlight group are installed inside the screen of the terminal, and the first backlight group and the second backlight group are provided when the terminal supplies current to the first backlight group and the second backlight group respectively.
  • the included plurality of backlights illuminate so that the screen of the terminal is illuminated so that the user can see the content on the screen.
  • the terminal receives the control command for adjusting the brightness value, the terminal determines a corresponding current value according to the brightness value, and provides the current value for the first backlight group and the second backlight group, so that the first backlight group and the first backlight group
  • the plurality of backlights of the two backlight groups emit light corresponding to the brightness value.
  • control command received by the terminal may be manually triggered by the user. For example, if the user thinks that the current brightness value of the screen of the terminal is not suitable, the user may press a button of the terminal or touch the screen to input a current brightness value to the terminal. Control command to the target brightness value.
  • the control command received by the terminal may also be triggered by the sensor inside the terminal under certain circumstances. For example, when the light sensor in the terminal collects the brightness of the ambient environment below a certain threshold, the light sensor will The terminal sends a control command to adjust the current brightness value to the target brightness value.
  • the current brightness value is the current brightness value of the screen of the terminal
  • the target brightness value is the adjusted brightness value.
  • the brightness value of the screen of the terminal is represented by a percentage
  • the terminal is provided with a rated operating current range of 1 to 20 mA for the backlight of the first backlight group and the backlight of the second backlight group, and the brightness value is 100%
  • the terminal will provide 20 mA of current for the backlight of the first backlight group and the backlight of the second backlight group.
  • the brightness value is 5 percent
  • the terminal will be the backlight of the first backlight group.
  • the backlight of the lamp and the second backlight group provides a current of 1 mA.
  • the terminal provides 10 backlights for the first backlight group and backlights for the second backlight group. mA current.
  • step S12 when the current brightness value is greater than the first threshold and the target brightness value is less than the first threshold, the supply of current to the backlight of the first backlight group is stopped, and the backlight of the second backlight group is determined to reach the target brightness value.
  • the desired target current value is provided and the target current value is provided for the backlight of the second backlight group.
  • the first threshold is a preset brightness value, and the first threshold varies according to the number of backlights of the screen of the terminal and the rated operating current range of the backlight.
  • the first threshold is a single group of backlights and dual The critical point at which the group backlight works.
  • the target brightness value is greater than or equal to the first threshold, the backlight of the first backlight group and the backlight of the second backlight group simultaneously work; when the target brightness value is less than the first threshold, the first backlight group The backlight of the backlight or the second backlight group operates.
  • the current brightness value is greater than the first threshold and the target brightness value is less than the first threshold, it indicates that the current terminal is simultaneously supplying current to the backlight of the first backlight group and the backlight of the second backlight group, but needs to be turned off at this time.
  • a group of backlights, this is to avoid the target brightness value is small and provide a lower current, the occurrence of backlight flashing light or unstable brightness.
  • the terminal determines the second backlight.
  • the number of lamps ⁇ target current value ⁇ brightness value per mA of each backlight target brightness value"
  • the brightness and target per mA of each backlight The brightness value determines the target current value required for the target brightness value.
  • the brightness value of the screen of the terminal is represented by a percentage
  • the terminal provides a rated operating current range of 1 to 20 mA for the backlight of the first backlight group and the backlight of the second backlight group, and is at the terminal.
  • the backlight of the first backlight group and the backlight of the second backlight group provide an operating current of less than 1 mA
  • the backlight of the first backlight group and the backlight of the second backlight group may flicker or brightness
  • the number of backlights of the first backlight group is six
  • the number of backlights of the second backlight group is six
  • the brightness value per milliamperes of each backlight is 0.4%
  • the current brightness value is For 10%
  • the current supply current value is 2 mA
  • the target brightness value is 3.75%
  • formula (A) "number of backlights ⁇ target current value ⁇ brightness value per mA per backlight target brightness "Value”
  • the first threshold is 4.8%.
  • the current brightness value 10% is greater than the first threshold 4.8% and the target brightness value 3.75% is less than the first threshold 4.8%, it is necessary to stop supplying current to the 6 backlights of the first backlight group, and determine the 6 of the second backlight group.
  • the brightness value ⁇ (the number of backlights ⁇ the brightness value per mA of each backlight)
  • calculate the target current value target brightness value 3.75% according to formula (B) ⁇ (the number of backlights 6 ⁇ each
  • the terminal will provide a target current value of 1.56 mA for the six backlights of the second backlight group. Since the target current value is 1.56 mA greater than 1 mA, the six backlights of the second backlight group are emitted. The light does not appear to be flickering or the brightness is unstable.
  • the backlight of the second backlight group when the target luminance value is less than the first threshold, only the backlight of the second backlight group is supplied with the target current value, and the supply of the backlight to the backlight of the first backlight group is stopped. Since the backlight of the first backlight group does not emit light, it is necessary to increase the target current value of the backlight provided to the second backlight group to compensate for the lack of brightness caused by the backlight of the first backlight group not being illuminated. The interference of external noise received due to the supply current value being too small is avoided, so the solution provided by the present disclosure can make the backlight stably emit light of extremely low brightness.
  • the method provided by the present disclosure may further include the step of determining the first backlight when the current brightness value is less than the second threshold and the target brightness value is greater than the second threshold.
  • the backlight of the lamp group and the backlight of the second backlight group together achieve the target current value required for the target brightness value, and simultaneously A target current value is provided for the backlight of the first backlight group and the backlight of the second backlight group, the second threshold being equal to the first threshold.
  • the second threshold is equal to the first threshold, and the current luminance value is less than the second threshold and the target luminance value is greater than the second threshold, it indicates that the current terminal only supplies current to the backlight of the first backlight group, or Only the backlight of the second backlight group is supplied with current, so another set of backlights needs to be turned on in order to ensure that the screen of the terminal can provide brightness according to the target brightness value.
  • the brightness value of the screen of the terminal is represented by a percentage, and it is assumed that the terminal currently supplies current only to the backlight of the first backlight group, and the terminal is provided by the backlight of the first backlight group and the backlight of the second backlight group.
  • the rated operating current range is 1 to 20 mA, and the backlight of the first backlight group is provided when the operating current of the backlight of the first backlight group and the backlight of the second backlight group is less than 1 mA.
  • the backlight of the second backlight group may have flicker or unstable brightness
  • the number of backlights of the first backlight group is six
  • the number of backlights of the second backlight group is six
  • each The backlight has a brightness value of 0.4% per mA
  • the current brightness value is 3.75%
  • the current supply current value is 1.56 mA
  • the target brightness value is 10%
  • the first threshold is 4 .8%
  • the first threshold is equal to the second threshold, then the second threshold is also 4.8%.
  • the current brightness value of 3.75% is less than the second threshold of 4.8% and the target brightness value of 10% is greater than the second threshold of 4.8%, it is necessary to determine that the six backlights of the first backlight group and the six backlights of the second backlight group are common.
  • the target current value required to reach the target luminance value of 10%, and simultaneously provide the target current value for the six backlights of the first backlight group and the six backlights of the second backlight group.
  • the brightness value ⁇ (the number of backlights ⁇ the brightness value per mA of each backlight)
  • the terminal provides a target current value of 2 mA for the 6 backlights of the first backlight group and the 6 backlights of the second backlight group, since the target current value is 2 mA greater than 1 mA,
  • the light emitted by the six backlights of the first backlight group and the six backlights of the second backlight group does not cause flicker or brightness instability; moreover, it can ensure that the screen of the terminal can provide brightness according to the target brightness value.
  • the method provided by the present disclosure may further include the step of determining the first backlight when the current brightness value is less than the second threshold and the target brightness value is greater than the second threshold.
  • the backlight of the lamp group and the backlight of the second backlight group together achieve the target current value required for the target brightness value, and simultaneously provide the target current value for the backlight of the first backlight group and the backlight of the second backlight group
  • the second threshold is greater than the first threshold.
  • the second threshold is greater than the first threshold and the current luminance value is less than the second threshold and If the target brightness value is greater than the second threshold, it indicates that the current terminal only supplies current to the backlight of the first backlight group, or only supplies current to the backlight of the second backlight group, so it is necessary to turn on another set of backlights, which is In order to ensure that the screen of the terminal can provide brightness according to the target brightness value; and, when a buffer is set between the first threshold and the second threshold, so that the target brightness value is in the buffer, the terminal can maintain the original control mode, and There is no need to frequently switch a set of backlights into two sets of backlights, or to switch two sets of backlights into a set of backlights.
  • the brightness value of the screen of the terminal is represented by a percentage, and it is assumed that the terminal currently supplies current only to the backlight of the first backlight group, and the terminal is provided by the backlight of the first backlight group and the backlight of the second backlight group.
  • the rated operating current range is 1 to 20 mA, and the backlight of the first backlight group is provided when the operating current of the backlight of the first backlight group and the backlight of the second backlight group is less than 1 mA.
  • the backlight of the second backlight group may have flicker or unstable brightness
  • the number of backlights of the first backlight group is six
  • the number of backlights of the second backlight group is six
  • each The backlight has a brightness value of 0.4% per mA
  • the current brightness value is 3.75%
  • the current supply current value is 1.56 mA
  • the target brightness value is 10%
  • the first threshold is 4 .8%
  • set the second threshold to 8%.
  • the current brightness value of 3.75% is less than the second threshold of 8% and the target brightness value of 10% is greater than the second threshold of 8%, it is necessary to determine that the six backlights of the first backlight group and the six backlights of the second backlight group are common.
  • the target current value required to reach the target luminance value of 10%, and simultaneously provide the target current value for the six backlights of the first backlight group and the six backlights of the second backlight group.
  • the brightness value ⁇ (the number of backlights ⁇ the brightness value per mA of each backlight)
  • the terminal provides a target current value of 2 mA for the 6 backlights of the first backlight group and the 6 backlights of the second backlight group, since the target current value is 2 mA greater than 1 mA,
  • the light emitted by the six backlights of the first backlight group and the six backlights of the second backlight group does not cause flicker or unstable brightness; moreover, it can ensure that the screen of the terminal can provide brightness according to the target brightness value;
  • the buffer is set to 4.8% to 8% between the first threshold 4.8% and the second threshold 8%, so that the target brightness value is in the buffer 4.8% to 8%, the terminal can maintain the original control mode. Instead of frequently switching a set of backlights into two sets of backlights, or switching two sets of backlights into a set of backlights.
  • the method provided by the present disclosure may further include the step of determining the first backlight group when the current brightness value and the target brightness value are both greater than the first threshold.
  • the backlight of the backlight and the second backlight group together achieve the target current value required for the target brightness value, and simultaneously the first backlight
  • the backlight of the light group and the backlight of the second backlight group provide a target current value. The purpose of this is that since both the current brightness value and the target brightness value are greater than the first threshold, it is not necessary to switch the two sets of backlights into one group, and only the current values of the two sets of backlights need to be switched.
  • the brightness value of the screen of the terminal is represented by a percentage, and it is assumed that the terminal currently supplies current for the backlight of the first backlight group and the backlight of the second backlight group, and the terminal is the backlight of the first backlight group and the first
  • the backlight of the second backlight group provides a rated operating current range of 1 to 20 mA, and provides an operating current of less than 1 mA at the terminal for the backlight of the first backlight group and the backlight of the second backlight group.
  • the backlight of the first backlight group and the backlight of the second backlight group may have flicker or unstable brightness.
  • the number of backlights of the first backlight group is six, and the backlight of the second backlight group is backlit.
  • the number of lamps is six, each backlight has a brightness value of 0.4% per mA, the current brightness value is 20%, the current current value is 4.16, and the target brightness value is 30%, so it can be backlit according to formula (A).
  • Number of lamps ⁇ target current value ⁇ brightness value per mA of each backlight target brightness value
  • calculate the first threshold number of backlights 12 ⁇ target current value 1 mA ⁇ per backlight per ohm
  • the brightness value ⁇ (the number of backlights ⁇ the brightness value per mA of each backlight)
  • calculate the target current value target brightness value 30% according to formula (B) ⁇ (the number of backlights is 12 ⁇ each
  • the terminal will provide a target current value of 6.25 mA for the 6 backlights of the first backlight group and the 6 backlights of the second backlight group.
  • the method provided by the present disclosure may further include the steps of: the current brightness value and the target brightness value are both smaller than the first threshold and currently only the first backlight group
  • the target current value required for the backlight of the first backlight group to reach the target brightness value is determined, and the target current value is provided for the backlight of the first backlight group.
  • the purpose of this is that since the current brightness value and the target brightness value are both smaller than the first threshold, there is no need to switch a group of backlights into two groups, and only the current value supplied to the first backlight group needs to be switched. .
  • the brightness value of the screen of the terminal is represented by a percentage, and it is assumed that the terminal currently supplies current only to the backlight of the first backlight group, and the terminal is provided by the backlight of the first backlight group and the backlight of the second backlight group.
  • the rated operating current range is 1 to 20 mA, and the backlight of the first backlight group is provided when the operating current of the backlight of the first backlight group and the backlight of the second backlight group is less than 1 mA.
  • the backlight of the second backlight group may be flickering or the brightness is unstable.
  • the brightness value ⁇ (the number of backlights ⁇ the brightness value per mA of each backlight)
  • calculate the target current value target brightness value 4% according to formula (B) ⁇ (the number of backlights 6 ⁇ each
  • the method provided by the present disclosure may further include the steps of: determining a first total working time of the first backlight group and a second of the second backlight group, respectively.
  • the total working time is determined whether the first total working time is greater than the second total working time; when the first total working time is greater than the second total working time, step S12 is performed; and the first total working time is less than or equal to the second total working time
  • the supply of current to the backlight of the second backlight group is stopped, the target current value required for the backlight of the first backlight group to reach the target brightness value is determined, and the target current value is provided for the backlight of the first backlight group.
  • the purpose of this is to indicate that the total time of operation of the first backlight group is longer than the total operation time of the second backlight group when the first total working time is greater than the second total working time, so in order to ensure the first backlight
  • the working time of the group and the second backlight group is relatively balanced, and step S12 needs to be performed to stop supplying current to the backlight of the first backlight group and perform subsequent operations; the first total working time is not greater than the second total working time.
  • the second time needs to be stopped.
  • the backlight of the backlight group provides current, determines a target current value required for the backlight of the first backlight group to reach the target brightness value, and provides a target current value for the backlight of the first backlight group.
  • FIG. 2 is a schematic diagram of a control device for backlight brightness, according to an exemplary embodiment.
  • the backlight brightness control device provided by the present disclosure can make the backlight stably emit light of extremely low brightness.
  • the apparatus includes a first backlight group 21, a second backlight group 22, a receiving module 23, and a first execution module 24. among them:
  • the first backlight group 21 and the second backlight group 22 each include a plurality of backlights
  • the receiving module 23 is configured to receive a control instruction for adjusting a current brightness value to a target brightness value
  • the first executing module 24 is configured to stop supplying current to the backlight of the first backlight group when the current brightness value is greater than the first threshold and the target brightness value is less than the first threshold, and determine that the backlight of the second backlight group reaches the target Brightness value The desired target current value is provided and the target current value is provided for the backlight of the second backlight group.
  • the apparatus may further include: a second execution module, configured to determine the first backlight when the current brightness value is less than the second threshold and the target brightness value is greater than the second threshold
  • the backlight of the group and the backlight of the second backlight group together achieve the target current value required for the target brightness value, and at the same time provide the target current value for the backlight of the first backlight group and the backlight of the second backlight group.
  • the second threshold is greater than or equal to the first threshold.
  • the apparatus may further include: a third execution module, configured to determine a backlight of the first backlight group when both the current brightness value and the target brightness value are greater than the first threshold
  • the backlight of the lamp and the second backlight group together achieve a target current value required for the target brightness value, and at the same time provide a target current value for the backlight of the first backlight group and the backlight of the second backlight group.
  • the apparatus may further include: a fourth execution module, configured to: the current brightness value and the target brightness value are both smaller than the first threshold and are currently only the first backlight group When the backlight supplies current, the target current value required for the backlight of the first backlight group to reach the target brightness value is determined, and the target current value is provided for the backlight of the first backlight group.
  • a fourth execution module configured to: the current brightness value and the target brightness value are both smaller than the first threshold and are currently only the first backlight group When the backlight supplies current, the target current value required for the backlight of the first backlight group to reach the target brightness value is determined, and the target current value is provided for the backlight of the first backlight group.
  • the apparatus may further include: a first determining module, configured to respectively determine a first total working time of the first backlight group and a second total of the second backlight group a working time; a first determining module, configured to determine whether the first total working time is greater than a second total working time; and a fifth executing module, configured to execute the first executing module when the first total working time is greater than the second total working time 24: stopping the supply of current to the backlight of the second backlight group when the first total working time is less than or equal to the second total working time, determining a target current value required for the backlight of the first backlight group to reach the target brightness value And providing a target current value for the backlight of the first backlight group.
  • a first determining module configured to respectively determine a first total working time of the first backlight group and a second total of the second backlight group a working time
  • a first determining module configured to determine whether the first total working time is greater than a second total working time
  • a fifth executing module configured to execute
  • FIG. 3 is a block diagram of a control device 800 for backlight brightness, according to an exemplary embodiment.
  • device 800 can be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a gaming console, a tablet device, a medical device, a fitness device, a personal digital assistant, and the like.
  • apparatus 800 can include one or more of the following components: processing component 802, memory 804, power component 806, multimedia component 808, audio component 810, input/output (I/O) interface 812, sensor component 814, And a communication component 816.
  • Processing component 802 typically controls the overall operation of device 800, such as with display, telephone calls, data communications, The operations associated with camera operations and recording operations.
  • Processing component 802 can include one or more processors 820 to execute instructions to perform all or part of the steps of the above described methods.
  • processing component 802 can include one or more modules to facilitate interaction between component 802 and other components.
  • processing component 802 can include a multimedia module to facilitate interaction between multimedia component 808 and processing component 802.
  • Memory 804 is configured to store various types of data to support operation at device 800. Examples of such data include instructions for any application or method operating on device 800, contact data, phone book data, messages, pictures, videos, and the like.
  • the memory 804 can be implemented by any type of volatile or non-volatile storage device, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read only memory (EEPROM), erasable.
  • SRAM static random access memory
  • EEPROM electrically erasable programmable read only memory
  • EPROM Electrically erasable programmable read only memory
  • PROM Programmable Read Only Memory
  • ROM Read Only Memory
  • Magnetic Memory Flash Memory
  • Disk Disk or Optical Disk.
  • Power component 806 provides power to various components of device 800.
  • Power component 806 can include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for device 800.
  • the multimedia component 808 includes a screen between the device 800 and the user that provides an output interface.
  • the screen can include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen can be implemented as a touch screen to receive input signals from the user.
  • the touch panel includes one or more touch sensors to sense touches, slides, and gestures on the touch panel. The touch sensor may sense not only the boundary of the touch or sliding action, but also the duration and pressure associated with the touch or slide operation.
  • the multimedia component 808 includes a front camera and/or a rear camera. When the device 800 is in an operation mode, such as a shooting mode or a video mode, the front camera and/or the rear camera can receive external multimedia data. Each front and rear camera can be a fixed optical lens system or have focal length and optical zoom capabilities.
  • the audio component 810 is configured to output and/or input an audio signal.
  • the audio component 810 includes a microphone (MIC) that is configured to receive an external audio signal when the device 800 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode.
  • the received audio signal may be further stored in memory 804 or transmitted via communication component 816.
  • the audio component 810 also includes a speaker for outputting an audio signal.
  • the I/O interface 812 provides an interface between the processing component 802 and the peripheral interface module, which may be a keyboard, a click wheel, a button, or the like. These buttons may include, but are not limited to, a home button, a volume button, a start button, and a lock button.
  • Sensor assembly 814 includes one or more sensors for providing device 800 with a status assessment of various aspects.
  • sensor component 814 can detect an open/closed state of device 800, relative positioning of components, such as The component is a display and keypad of device 800, which may also detect a change in position of one component of device 800 or device 800, the presence or absence of contact of user with device 800, orientation of device 800 or acceleration/deceleration and device 800 The temperature changes.
  • Sensor assembly 814 can include a proximity sensor configured to detect the presence of nearby objects without any physical contact.
  • Sensor assembly 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications.
  • the sensor assembly 814 can also include an acceleration sensor, a gyro sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
  • Communication component 816 is configured to facilitate wired or wireless communication between device 800 and other devices.
  • the device 800 can access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof.
  • communication component 816 receives broadcast signals or broadcast associated information from an external broadcast management system via a broadcast channel.
  • the communication component 816 also includes a near field communication (NFC) module to facilitate short range communication.
  • NFC near field communication
  • the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.
  • RFID radio frequency identification
  • IrDA infrared data association
  • UWB ultra-wideband
  • Bluetooth Bluetooth
  • device 800 may be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable A gate array (FPGA), controller, microcontroller, microprocessor, or other electronic component implementation for performing the above methods.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGA field programmable A gate array
  • controller microcontroller, microprocessor, or other electronic component implementation for performing the above methods.
  • non-transitory computer readable storage medium comprising instructions, such as a memory 804 comprising instructions executable by processor 820 of apparatus 800 to perform the above method.
  • the non-transitory computer readable storage medium may be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device.
  • a non-transitory computer readable storage medium when instructions in the storage medium are executed by a processor of a mobile terminal, enabling the mobile terminal to perform a method of controlling backlight brightness, the method comprising: receiving current brightness And a control command for adjusting the value to the target brightness value; when the current brightness value is greater than the first threshold and the target brightness value is less than the first threshold, stopping supplying current to the backlight of the first backlight group, determining the backlight of the second backlight group The target current value required to reach the target brightness value and the target current value for the backlight of the second backlight group.

Abstract

一种背光亮度的控制方法及装置，所述方法包括：接收将当前亮度值调整到目标亮度值的控制指令（S11）；在所述当前亮度值大于第一阈值且所述目标亮度值小于第一阈值时，停止为第一背光灯组的背光灯提供电流，确定第二背光灯组的背光灯达到所述目标亮度值所需要的目标电流值，并为第二背光灯组的背光灯提供所述目标电流值（S12）。由于第一背光灯组的背光灯不发光，所以需要提高提供给第二背光灯组的背光灯的目标电流值，用以弥补第一背光灯组的背光灯不发光所造成的亮度缺失，从而避免了因供应的电流值过小而受到的外部噪声的干扰，可以使背光灯稳定的发出极低亮度的光线。

Description

一种背光亮度的控制方法及装置
相关申请的交叉引用
本申请基于申请号为201410423129.3、申请日为2014/8/26的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此引入本申请作为参考。
技术领域
本发明涉及通信技术领域，更具体的说，涉及背光亮度的控制方法及装置。
背景技术
在日常生活中，人们经常会在光线较弱的地方使用智能设备。由于周围环境光线较弱时，智能设备的背光灯发出的光线会非常刺眼，通常情况下，用户会将智能设备的背光灯的亮度调低，以使智能设备的背光灯发出较低亮度的光线，从而适应周围的环境。但是，用户在某些光线特别暗的地方，即使将智能设备的背光灯的亮度调整到最低值，用户在使用智能设备的时候还是会觉得刺眼。
由于终端的控制芯片提供给背光灯的电流与背光灯发出的亮度成正比，所以相关技术为了使智能设备的背光灯能够达到更低的亮度，通常采用降低智能设备的背光灯的供电电流的方法。但是，如果仅仅通过降低背光灯的供电电流来降低背光灯的亮度，那么在背光灯的供电电流降低到一定程度的时候，用于为背光灯提供电流的控制芯片的信噪比会非常低，从而使控制芯片受到外部噪声的影响会非常大，以至于在用户给智能设备设定一个固定的极低亮度时，智能设备的控制芯片可能会受到外部噪声的干扰，控制芯片输出给的背光灯电流可能会出现不稳定的情况。在背光灯接收到不稳定的供电电流时，背光灯的亮度会随着控制芯片输出电流的变化不断的闪烁，所以背光灯的亮度不会维持在那个固定的低亮度上。智能设备的背光灯在低亮度时不停的闪烁不仅会降低用户的使用感受，而且，背光灯在一个电流不稳定的情况下工作，会降低背光灯的使用寿命。
因此，如何使智能设备的背光灯稳定的发出极低亮度的光线，成为目前亟需解决的技术问题。
发明内容
为克服相关技术中存在的问题，本公开提供一种背光亮度的控制方法及装置，以使智能设备的背光灯稳定的发出极低亮度的光线。
根据本公开实施例的第一方面，提供一种背光亮度的控制方法，所述方法应用于所述终端内，所述终端包括第一背光灯组和第二背光灯组，所述第一背光灯组和所述第二背光灯组均包含有多个背光灯，所述终端为所述第一背光灯组的背光灯和所述第二背光灯组的背光灯提供电流，所述方法包括：
接收将当前亮度值调整到目标亮度值的控制指令；
在所述当前亮度值大于第一阈值且所述目标亮度值小于第一阈值时，停止为所述第一背光灯组的背光灯提供电流，确定所述第二背光灯组的背光灯达到所述目标亮度值所需要的目标电流值，并为所述第二背光灯组的背光灯提供所述目标电流值。
可选的，在所述接收将当前亮度值调整到目标亮度值的控制指令之后，所述方法还包括：
在所述当前亮度值小于所述第二阈值且所述目标亮度值大于所述第二阈值时，确定所述第一背光灯组的背光灯和所述第二背光灯组的背光灯共同达到所述目标亮度值所需要的目标电流值，并同时为所述第一背光灯组的背光灯和所述第二背光灯组的背光灯提供所述目标电流值，所述第二阈值大于或等于所述第一阈值。
可选的，在所述接收将当前亮度值调整到目标亮度值的控制指令之后，所述方法还包括：
在所述当前亮度值和所述目标亮度值均大于第一阈值时，确定所述第一背光灯组的背光灯和所述第二背光灯组的背光灯共同达到所述目标亮度值所需要的目标电流值，并同时为所述第一背光灯组的背光灯和所述第二背光灯组的背光灯提供所述目标电流值。
可选的，在所述接收将当前亮度值调整到目标亮度值的控制指令之后，所述方法还包括：
在所述当前亮度值和所述目标亮度值均小于第一阈值且当前仅为所述第一背光灯组的背光灯提供电流时，确定所述第一背光灯组的背光灯达到所述目标亮度值所需要的目标电流值，并为所述第一背光灯组的背光灯提供所述目标电流值。
可选的，在所述停止为所述第一背光灯组的背光灯提供电流之前，所述方法还包括：
分别确定所述第一背光灯组的第一总工作时间和所述第二背光灯组的第二总工作时间；
判断所述第一总工作时间是否大于所述第二总工作时间；
在所述第一总工作时间大于所述第二总工作时间时，执行所述停止为所述第一背光灯组的背光灯提供电流的步骤；
在所述第一总工作时间小于或等于所述第二总工作时间时，停止为所述第二背光灯组的背光灯提供电流，确定所述第一背光灯组的背光灯达到所述目标亮度值所需要的目标电流值，并为所述第一背光灯组的背光灯提供所述目标电流值。
根据本公开实施例的第二方面，提供一种背光亮度的控制装置，包括：
第一背光灯组和第二背光灯组，所述第一背光灯组和所述第二背光灯组均包含有多个背光灯；
接收模块，用于接收将当前亮度值调整到目标亮度值的控制指令；
第一执行模块，用于在所述当前亮度值大于第一阈值且所述目标亮度值小于第一阈值时，停止为所述第一背光灯组的背光灯提供电流，确定所述第二背光灯组的背光灯达到所述目标亮度值所需要的目标电流值，并为所述第二背光灯组的背光灯提供所述目标电流值。
可选的，所述装置还包括：
第二执行模块，用于在所述当前亮度值小于所述第二阈值且所述目标亮度值大于所述第二阈值时，确定所述第一背光灯组的背光灯和所述第二背光灯组的背光灯共同达到所述目标亮度值所需要的目标电流值，并同时为所述第一背光灯组的背光灯和所述第二背光灯组的背光灯提供所述目标电流值，所述第二阈值大于或等于所述第一阈值。
可选的，所述装置还包括：
第三执行模块，用于在所述当前亮度值和所述目标亮度值均大于第一阈值时，确定所述第一背光灯组的背光灯和所述第二背光灯组的背光灯共同达到所述目标亮度值所需要的目标电流值，并同时为所述第一背光灯组的背光灯和所述第二背光灯组的背光灯提供所述目标电流值。
可选的，所述装置还包括：
第四执行模块，用于在所述当前亮度值和所述目标亮度值均小于第一阈值且当前仅为所述第一背光灯组的背光灯提供电流时，确定所述第一背光灯组的背光灯达到所述目标亮度值所需要的目标电流值，并为所述第一背光灯组的背光灯提供所述目标电流值。
可选的，所述装置还包括：
第一确定模块，用于分别确定所述第一背光灯组的第一总工作时间和所述第二背光灯组的第二总工作时间；
第一判断模块，用于判断所述第一总工作时间是否大于所述第二总工作时间；
第五执行模块，用于在所述第一总工作时间大于所述第二总工作时间时，执行所述第一执行模块；在所述第一总工作时间小于或等于所述第二总工作时间时，停止为所述第二背光灯组的背光灯提供电流，确定所述第一背光灯组的背光灯达到所述目标亮度值所需要的目标电流值，并为所述第一背光灯组的背光灯提供所述目标电流值。
根据本公开实施例的第三方面，提供一种背光亮度的控制装置，包括：
处理器；
用于存储处理器可执行指令的存储器；
其中，所述处理器被配置为：
接收将当前亮度值调整到目标亮度值的控制指令；
在所述当前亮度值大于第一阈值且所述目标亮度值小于第一阈值时，停止为所述第一背 光灯组的背光灯提供电流，确定所述第二背光灯组的背光灯达到所述目标亮度值所需要的目标电流值，并为所述第二背光灯组的背光灯提供所述目标电流值。
本公开的实施例提供的技术方案可以包括以下有益效果：在目标亮度值小于第一阈值时，仅为第二背光灯组的背光灯提供目标电流值，且停止为第一背光灯组的背光灯提供电流。由于第一背光灯组的背光灯不发光，所以需要提高提供给第二背光灯组的背光灯的目标电流值，用以弥补第一背光灯组的背光灯不发光所造成的亮度缺失，从而避免了因供应的电流值过小而受到的外部噪声的干扰，所以本公开提供的方案可以使背光灯稳定的发出极低亮度的光线。
应当理解的是，以上的一般描述和后文的细节描述仅是示例性和解释性的，并不能限制本公开。
附图说明
此处的附图被并入说明书中并构成本说明书的一部分，示出了符合本发明的实施例，并与说明书一起用于解释本发明的原理。
图1是根据一示例性实施例示出的一种背光亮度的控制方法的流程图。
图2是根据一示例性实施例示出的一种背光亮度的控制装置的示意图。
图3是根据一示例性实施例示出的一种背光亮度的控制装置的框图。
具体实施方式
这里将详细地对示例性实施例进行说明，其示例表示在附图中。下面的描述涉及附图时，除非另有表示，不同附图中的相同数字表示相同或相似的要素。以下示例性实施例中所描述的实施方式并不代表与本发明相一致的所有实施方式。相反，它们仅是与如所附权利要求书中所详述的、本发明的一些方面相一致的装置和方法的例子。
图1是根据一示例性实施例示出的一种背光亮度的控制方法的流程图，如图1所示，图1所示的背光亮度的控制方法，可以用于终端中，该终端可以包括第一背光灯组和第二背光灯组，第一背光灯组和第二背光灯组均包含有多个背光灯，该终端为第一背光灯组的背光灯和第二背光灯组的背光灯提供电流。本公开提供的背光亮度的控制方法可以使背光灯稳定的发出极低亮度的光线。该方法包括以下步骤。
在步骤S11中，接收将当前亮度值调整到目标亮度值的控制指令。
其中，终端的屏幕内部安装有第一背光灯组和第二背光灯组，在终端为第一背光灯组和第二背光灯组分别提供电流时，第一背光灯组和第二背光灯组包含的多个背光灯会发光，以使终端的屏幕被点亮，从而用户可以看到屏幕上的内容。正常情况下，在终端 接收到调整亮度值的控制指令时，终端会根据该亮度值确定出对应的电流值，并为第一背光灯组和第二背光灯组提供该电流值，以使第一背光灯组和第二背光灯组的多个背光灯发出对应于该亮度值的光线。
另外，终端接收到的控制指令可以为用户手动触发的，例如，用户认为终端的屏幕的当前亮度值不适合，用户会按压终端的按键或触摸屏幕，用以向终端输入一个将当前亮度值调整到目标亮度值的控制指令。终端接收到的控制指令也可以为终端内部的传感器在某种特定的情况下触发的，例如，在终端内的光线传感器采集到周围环境的光线亮度低于一定的阈值时，光线传感器便会向终端发送将当前亮度值调整到目标亮度值的控制指令。
另外，当前亮度值为终端的屏幕当前的亮度值，目标亮度值为调整后的亮度值。在终端的屏幕的亮度值最大时，说明终端提供给第一背光灯组的背光灯和第二背光灯组的背光灯最大的额定工作电流；在终端的屏幕的亮度值最小时，说明终端提供给第一背光灯组的背光灯和第二背光灯组的背光灯最小的额定工作电流。例如，通过百分比来表示终端的屏幕的亮度值，假设终端为第一背光灯组的背光灯和第二背光灯组的背光灯提供的额定工作电流范围是1至20毫安，在亮度值为百分之百时，终端会为第一背光灯组的背光灯和第二背光灯组的背光灯提供20毫安的电流，在亮度值为百分之五时，终端会为第一背光灯组的背光灯和第二背光灯组的背光灯提供1毫安的电流，在亮度值为百分之五十时，终端会为第一背光灯组的背光灯和第二背光灯组的背光灯提供10毫安的电流。
在步骤S12中，在当前亮度值大于第一阈值且目标亮度值小于第一阈值时，停止为第一背光灯组的背光灯提供电流，确定第二背光灯组的背光灯达到目标亮度值所需要的目标电流值，并为第二背光灯组的背光灯提供目标电流值。
其中，第一阈值为预先设定的亮度值，第一阈值会随着终端的屏幕的背光灯数量和背光灯的额定工作电流范围的不同而变化，第一阈值为单组背光灯工作和双组背光灯工作的临界点。在目标亮度值大于或等于第一阈值时，则第一背光灯组的背光灯和第二背光灯组的背光灯同时工作；在目标亮度值小于第一阈值时，则第一背光灯组的背光灯或第二背光灯组的背光灯工作。如果当前亮度值大于第一阈值且目标亮度值小于第一阈值，那么说明当前终端正在同时为第一背光灯组的背光灯和第二背光灯组的背光灯提供电流，但是此时需要关闭一组背光灯，这是为了避免目标亮度值较小而提供较低的电流，所出现的背光灯发出的光线闪烁或亮度不稳定的情况。
另外，在终端停止为第一背光灯组的背光灯提供电流以后，终端便会确定第二背光 灯组的背光灯达到目标亮度值所需要的目标电流值。由于第二背光灯组的背光灯的数量是已知的，每颗背光灯每毫安所发出的亮度也是已知的，目标亮度值也是已知的，所以便可以依据公式(A)“背光灯的数量×目标电流值×每颗背光灯每毫安的亮度值＝目标亮度值”，并通过第二背光灯组的背光灯的数量、每颗背光灯每毫安所发出的亮度和目标亮度值确定出目标亮度值所需要的目标电流值。
下面通过例子来说明本发开提供的方案。例如，通过百分比来表示终端的屏幕的亮度值，假设终端为第一背光灯组的背光灯和第二背光灯组的背光灯提供的额定工作电流范围是1至20毫安，且在终端为第一背光灯组的背光灯和第二背光灯组的背光灯提供的工作电流小于1毫安时，第一背光灯组的背光灯和第二背光灯组的背光灯可能会出现闪烁或亮度不稳定的情况，第一背光灯组的背光灯的数量为6个，第二背光灯组的背光灯的数量为6个，每颗背光灯每毫安的亮度值为0.4％，当前亮度值为10％，当前供电电流值为2毫安，目标亮度值为3.75％，所以可以根据公式(A)“背光灯的数量×目标电流值×每颗背光灯每毫安的亮度值＝目标亮度值”，计算出第一阈值＝背光灯的数量12个×目标电流值1毫安×每颗背光灯每毫安的亮度值0.4％＝4.8％，所以第一阈值为4.8％。由于当前亮度值10％大于第一阈值4.8％且目标亮度值3.75％小于第一阈值4.8％，所以需要停止为第一背光灯组的6个背光灯提供电流，确定第二背光灯组的6个背光灯达到目标亮度值3.75％所需要的目标电流值。为了计算目标电流值，可以根据公式(A)“背光灯的数量×目标电流值×每颗背光灯每毫安的亮度值＝目标亮度值”，来得出公式(B)“目标电流值＝目标亮度值÷(背光灯的数量×每颗背光灯每毫安的亮度值)”，并根据公式(B)计算出目标电流值＝目标亮度值3.75％÷(背光灯的数量6个×每颗背光灯每毫安的亮度值0.4％)＝1.56毫安。此时，终端便会为第二背光灯组的6个背光灯提供1.56毫安的目标电流值，由于目标电流值1.56毫安大于1毫安，所以第二背光灯组的6个背光灯发出的光线不会出现闪烁或亮度不稳定的情况。
在图1所示的实施例中，在目标亮度值小于第一阈值时，仅为第二背光灯组的背光灯提供目标电流值，且停止为第一背光灯组的背光灯提供电流。由于第一背光灯组的背光灯不发光，所以需要提高提供给第二背光灯组的背光灯的目标电流值，用以弥补第一背光灯组的背光灯不发光所造成的亮度缺失，从而避免了因供应的电流值过小而受到的外部噪声的干扰，所以本公开提供的方案可以使背光灯稳定的发出极低亮度的光线。
在本公开的一个可选的实施例中，在步骤S11之后，本公开提供的方法还可以包括以下步骤：在当前亮度值小于第二阈值且目标亮度值大于第二阈值时，确定第一背光灯组的背光灯和第二背光灯组的背光灯共同达到目标亮度值所需要的目标电流值，并同时 为第一背光灯组的背光灯和第二背光灯组的背光灯提供目标电流值，第二阈值等于第一阈值。这样做的目的是，由于第二阈值等于第一阈值，而且当前亮度值小于第二阈值且目标亮度值大于第二阈值，那么说明当前终端仅为第一背光灯组的背光灯提供电流，或仅为第二背光灯组的背光灯提供电流，所以需要打开另外一组背光灯，这是为了保证终端的屏幕能够根据目标亮度值提供亮度。
例如，通过百分比来表示终端的屏幕的亮度值，假设终端当前仅为第一背光灯组的背光灯提供电流，终端为第一背光灯组的背光灯和第二背光灯组的背光灯提供的额定工作电流范围是1至20毫安，且在终端为第一背光灯组的背光灯和第二背光灯组的背光灯提供的工作电流小于1毫安时，第一背光灯组的背光灯和第二背光灯组的背光灯可能会出现闪烁或亮度不稳定的情况，第一背光灯组的背光灯的数量为6个，第二背光灯组的背光灯的数量为6个，每颗背光灯每毫安的亮度值为0.4％，当前亮度值为3.75％，当前供电电流值为1.56毫安，目标亮度值为10％，所以可以根据公式(A)“背光灯的数量×目标电流值×每颗背光灯每毫安的亮度值＝目标亮度值”，计算出第一阈值＝背光灯的数量12个×目标电流值1毫安×每颗背光灯每毫安的亮度值0.4％＝4.8％，所以第一阈值为4.8％，且第一阈值等于第二阈值，则第二阈值也为4.8％。由于当前亮度值3.75％小于第二阈值4.8％且目标亮度值10％大于第二阈值4.8％，所以需要确定第一背光灯组的6个背光灯和第二背光灯组的6个背光灯共同达到目标亮度值10％所需要的目标电流值，并同时为第一背光灯组的6个背光灯和第二背光灯组的6个背光灯提供目标电流值。为了计算目标电流值，可以根据公式(A)“背光灯的数量×目标电流值×每颗背光灯每毫安的亮度值＝目标亮度值”，来得出公式(B)“目标电流值＝目标亮度值÷(背光灯的数量×每颗背光灯每毫安的亮度值)”，并根据公式(B)计算出目标电流值＝目标亮度值10％÷(背光灯的数量12个×每颗背光灯每毫安的亮度值0.4％)＝2毫安。此时，终端便会为第一背光灯组的6个背光灯和第二背光灯组的6个背光灯提供2毫安的目标电流值，由于目标电流值2毫安大于1毫安，所以第一背光灯组的6个背光灯和第二背光灯组的6个背光灯发出的光线不会出现闪烁或亮度不稳定的情况；而且，可以保证终端的屏幕能够根据目标亮度值提供亮度。
在本公开的一个可选的实施例中，在步骤S11之后，本公开提供的方法还可以包括以下步骤：在当前亮度值小于第二阈值且目标亮度值大于第二阈值时，确定第一背光灯组的背光灯和第二背光灯组的背光灯共同达到目标亮度值所需要的目标电流值，并同时为第一背光灯组的背光灯和第二背光灯组的背光灯提供目标电流值，第二阈值大于第一阈值。这样做的目的是，由于第二阈值大于第一阈值，而且当前亮度值小于第二阈值且 目标亮度值大于第二阈值，那么说明当前终端仅为第一背光灯组的背光灯提供电流，或仅为第二背光灯组的背光灯提供电流，所以需要打开另外一组背光灯，这是为了保证终端的屏幕能够根据目标亮度值提供亮度；而且，在第一阈值和第二阈值之间设置缓冲区，以使目标亮度值处于该缓冲区时，终端能够保持原有的控制方式，而无需频繁的将一组背光灯切换成两组背光灯，或将两组背光灯切换成一组背光灯。
例如，通过百分比来表示终端的屏幕的亮度值，假设终端当前仅为第一背光灯组的背光灯提供电流，终端为第一背光灯组的背光灯和第二背光灯组的背光灯提供的额定工作电流范围是1至20毫安，且在终端为第一背光灯组的背光灯和第二背光灯组的背光灯提供的工作电流小于1毫安时，第一背光灯组的背光灯和第二背光灯组的背光灯可能会出现闪烁或亮度不稳定的情况，第一背光灯组的背光灯的数量为6个，第二背光灯组的背光灯的数量为6个，每颗背光灯每毫安的亮度值为0.4％，当前亮度值为3.75％，当前供电电流值为1.56毫安，目标亮度值为10％，所以可以根据公式(A)“背光灯的数量×目标电流值×每颗背光灯每毫安的亮度值＝目标亮度值”，计算出第一阈值＝背光灯的数量12个×目标电流值1毫安×每颗背光灯每毫安的亮度值0.4％＝4.8％，所以第一阈值为4.8％，且将第二阈值设定为8％。由于当前亮度值3.75％小于第二阈值8％且目标亮度值10％大于第二阈值8％，所以需要确定第一背光灯组的6个背光灯和第二背光灯组的6个背光灯共同达到目标亮度值10％所需要的目标电流值，并同时为第一背光灯组的6个背光灯和第二背光灯组的6个背光灯提供目标电流值。为了计算目标电流值，可以根据公式(A)“背光灯的数量×目标电流值×每颗背光灯每毫安的亮度值＝目标亮度值”，来得出公式(B)“目标电流值＝目标亮度值÷(背光灯的数量×每颗背光灯每毫安的亮度值)”，并根据公式(B)计算出目标电流值＝目标亮度值10％÷(背光灯的数量12个×每颗背光灯每毫安的亮度值0.4％)＝2毫安。此时，终端便会为第一背光灯组的6个背光灯和第二背光灯组的6个背光灯提供2毫安的目标电流值，由于目标电流值2毫安大于1毫安，所以第一背光灯组的6个背光灯和第二背光灯组的6个背光灯发出的光线不会出现闪烁或亮度不稳定的情况；而且，可以保证终端的屏幕能够根据目标亮度值提供亮度；另外，在第一阈值4.8％和第二阈值8％之间设置缓冲区4.8％至8％，以使目标亮度值处于该缓冲区4.8％至8％时，终端能够保持原有的控制方式，而无需频繁的将一组背光灯切换成两组背光灯，或将两组背光灯切换成一组背光灯。
在本公开的一个可选的实施例中，在步骤S11之后，本公开提供的方法还可以包括以下步骤：在当前亮度值和目标亮度值均大于第一阈值时，确定第一背光灯组的背光灯和第二背光灯组的背光灯共同达到目标亮度值所需要的目标电流值，并同时为第一背光 灯组的背光灯和第二背光灯组的背光灯提供目标电流值。这样做的目的是，由于当前亮度值和目标亮度值均大于第一阈值，所以不需要将两组背光灯切换成一组，仅需要将两组背光灯的电流值进行切换即可。
例如，通过百分比来表示终端的屏幕的亮度值，假设终端当前同时为第一背光灯组的背光灯和第二背光灯组的背光灯提供电流，终端为第一背光灯组的背光灯和第二背光灯组的背光灯提供的额定工作电流范围是1至20毫安，且在终端为第一背光灯组的背光灯和第二背光灯组的背光灯提供的工作电流小于1毫安时，第一背光灯组的背光灯和第二背光灯组的背光灯可能会出现闪烁或亮度不稳定的情况，第一背光灯组的背光灯的数量为6个，第二背光灯组的背光灯的数量为6个，每颗背光灯每毫安的亮度值为0.4％，当前亮度值为20％，当前电流值为4.16，目标亮度值为30％，所以可以根据公式(A)“背光灯的数量×目标电流值×每颗背光灯每毫安的亮度值＝目标亮度值”，计算出第一阈值＝背光灯的数量12个×目标电流值1毫安×每颗背光灯每毫安的亮度值0.4％＝4.8％，所以第一阈值为4.8％。由于当前亮度值20％和目标亮度值30％均大于第一阈值4.8％，所以不需要将两组背光灯切换成一组，仅需要将两组背光灯的电流值进行切换即可。为了计算目标电流值，可以根据公式(A)“背光灯的数量×目标电流值×每颗背光灯每毫安的亮度值＝目标亮度值”，来得出公式(B)“目标电流值＝目标亮度值÷(背光灯的数量×每颗背光灯每毫安的亮度值)”，并根据公式(B)计算出目标电流值＝目标亮度值30％÷(背光灯的数量12个×每颗背光灯每毫安的亮度值0.4％)＝6.25毫安。此时，终端便会同时为第一背光灯组的6个背光灯和第二背光灯组的6个背光灯提供6.25毫安的目标电流值。
在本公开的一个可选的实施例中，在步骤S11之后，本公开提供的方法还可以包括以下步骤：在当前亮度值和目标亮度值均小于第一阈值且当前仅为第一背光灯组的背光灯提供电流时，确定第一背光灯组的背光灯达到目标亮度值所需要的目标电流值，并为第一背光灯组的背光灯提供目标电流值。这样做的目的是，由于当前亮度值和目标亮度值均小于第一阈值，所以不需要将一组背光灯切换成两组，仅需要将提供给第一背光灯组的电流值进行切换即可。
例如，通过百分比来表示终端的屏幕的亮度值，假设终端当前仅为第一背光灯组的背光灯提供电流，终端为第一背光灯组的背光灯和第二背光灯组的背光灯提供的额定工作电流范围是1至20毫安，且在终端为第一背光灯组的背光灯和第二背光灯组的背光灯提供的工作电流小于1毫安时，第一背光灯组的背光灯和第二背光灯组的背光灯可能会出现闪烁或亮度不稳定的情况，第一背光灯组的背光灯的数量为6个，第二背光灯组 的背光灯的数量为6个，每颗背光灯每毫安的亮度值为0.4％，当前亮度值为3％，当前电流值为1.25，目标亮度值为4％，所以可以根据公式(A)“背光灯的数量×目标电流值×每颗背光灯每毫安的亮度值＝目标亮度值”，计算出第一阈值＝背光灯的数量12个×目标电流值1毫安×每颗背光灯每毫安的亮度值0.4％＝4.8％，所以第一阈值为4.8％。由于当前亮度值3％和目标亮度值4％均小于第一阈值4.8％，所以不需要将一组背光灯切换成两组，仅需要将一组背光灯的电流值进行切换即可。为了计算目标电流值，可以根据公式(A)“背光灯的数量×目标电流值×每颗背光灯每毫安的亮度值＝目标亮度值”，来得出公式(B)“目标电流值＝目标亮度值÷(背光灯的数量×每颗背光灯每毫安的亮度值)”，并根据公式(B)计算出目标电流值＝目标亮度值4％÷(背光灯的数量6个×每颗背光灯每毫安的亮度值0.4％)＝1.6毫安。此时，终端便会同时为第一背光灯组的6个背光灯提供1.6毫安的目标电流值。
在本公开的一个可选的实施例中，在步骤S12之前，本公开提供的方法还可以包括以下步骤：分别确定第一背光灯组的第一总工作时间和第二背光灯组的第二总工作时间；判断第一总工作时间是否大于第二总工作时间；在第一总工作时间大于第二总工作时间时，执行步骤S12；在第一总工作时间小于或等于第二总工作时间时，停止为第二背光灯组的背光灯提供电流，确定第一背光灯组的背光灯达到目标亮度值所需要的目标电流值，并为第一背光灯组的背光灯提供目标电流值。这样做的目的是，在第一总工作时间大于第二总工作时间时，说明第一背光灯组工作的总时间比第二背光灯组工作的总时间要长，所以为了保证第一背光灯组和第二背光灯组的工作时间相对均衡，需要执行步骤S12，以停止为第一背光灯组的背光灯提供电流，并执行后续操作；在第一总工作时间不大于第二总工作时间时，说明第二背光灯组工作的总时间比第一背光灯组工作的总时间要长，所以为了保证第一背光灯组和第二背光灯组的工作时间相对均衡，需要停止为第二背光灯组的背光灯提供电流，确定第一背光灯组的背光灯达到目标亮度值所需要的目标电流值，并为第一背光灯组的背光灯提供目标电流值。
图2是根据一示例性实施例示出的一种背光亮度的控制装置的示意图。本公开提供的背光亮度的控制装置可以使背光灯稳定的发出极低亮度的光线。参照图2，该装置包括第一背光灯组21、第二背光灯组22、接收模块23和第一执行模块24。其中：
第一背光灯组21和第二背光灯组22均包含有多个背光灯；
接收模块23，用于接收将当前亮度值调整到目标亮度值的控制指令；
第一执行模块24，用于在当前亮度值大于第一阈值且目标亮度值小于第一阈值时，停止为第一背光灯组的背光灯提供电流，确定第二背光灯组的背光灯达到目标亮度值所 需要的目标电流值，并为第二背光灯组的背光灯提供目标电流值。
在本公开的一个可选的实施例中，该装置还可以包括以下模块：第二执行模块，用于在当前亮度值小于第二阈值且目标亮度值大于第二阈值时，确定第一背光灯组的背光灯和第二背光灯组的背光灯共同达到目标亮度值所需要的目标电流值，并同时为第一背光灯组的背光灯和第二背光灯组的背光灯提供目标电流值，第二阈值大于或等于第一阈值。
在本公开的一个可选的实施例中，该装置还可以包括以下模块：第三执行模块，用于在当前亮度值和目标亮度值均大于第一阈值时，确定第一背光灯组的背光灯和第二背光灯组的背光灯共同达到目标亮度值所需要的目标电流值，并同时为第一背光灯组的背光灯和第二背光灯组的背光灯提供目标电流值。
在本公开的一个可选的实施例中，该装置还可以包括以下模块：第四执行模块，用于在当前亮度值和目标亮度值均小于第一阈值且当前仅为第一背光灯组的背光灯提供电流时，确定第一背光灯组的背光灯达到目标亮度值所需要的目标电流值，并为第一背光灯组的背光灯提供目标电流值。
在本公开的一个可选的实施例中，该装置还可以包括以下模块：第一确定模块，用于分别确定第一背光灯组的第一总工作时间和第二背光灯组的第二总工作时间；第一判断模块，用于判断第一总工作时间是否大于第二总工作时间；第五执行模块，用于在第一总工作时间大于第二总工作时间时，执行第一执行模块24；在第一总工作时间小于或等于第二总工作时间时，停止为第二背光灯组的背光灯提供电流，确定第一背光灯组的背光灯达到目标亮度值所需要的目标电流值，并为第一背光灯组的背光灯提供目标电流值。
关于上述实施例中的装置，其中各个模块执行操作的具体方式已经在有关该方法的实施例中进行了详细描述，此处将不做详细阐述说明。
图3是根据一示例性实施例示出的一种背光亮度的控制装置800的框图。例如，装置800可以是移动电话，计算机，数字广播终端，消息收发设备，游戏控制台，平板设备，医疗设备，健身设备，个人数字助理等。
参照图3，装置800可以包括以下一个或多个组件：处理组件802，存储器804，电源组件806，多媒体组件808，音频组件810，输入/输出(I/O)的接口812，传感器组件814，以及通信组件816。
处理组件802通常控制装置800的整体操作，诸如与显示，电话呼叫，数据通信， 相机操作和记录操作相关联的操作。处理组件802可以包括一个或多个处理器820来执行指令，以完成上述的方法的全部或部分步骤。此外，处理组件802可以包括一个或多个模块，便于处理组件802和其他组件之间的交互。例如，处理组件802可以包括多媒体模块，以方便多媒体组件808和处理组件802之间的交互。
存储器804被配置为存储各种类型的数据以支持在装置800的操作。这些数据的示例包括用于在装置800上操作的任何应用程序或方法的指令，联系人数据，电话簿数据，消息，图片，视频等。存储器804可以由任何类型的易失性或非易失性存储设备或者它们的组合实现，如静态随机存取存储器(SRAM)，电可擦除可编程只读存储器(EEPROM)，可擦除可编程只读存储器(EPROM)，可编程只读存储器(PROM)，只读存储器(ROM)，磁存储器，快闪存储器，磁盘或光盘。
电源组件806为装置800的各种组件提供电力。电源组件806可以包括电源管理系统，一个或多个电源，及其他与为装置800生成、管理和分配电力相关联的组件。
多媒体组件808包括在所述装置800和用户之间的提供一个输出接口的屏幕。在一些实施例中，屏幕可以包括液晶显示器(LCD)和触摸面板(TP)。如果屏幕包括触摸面板，屏幕可以被实现为触摸屏，以接收来自用户的输入信号。触摸面板包括一个或多个触摸传感器以感测触摸、滑动和触摸面板上的手势。所述触摸传感器可以不仅感测触摸或滑动动作的边界，而且还检测与所述触摸或滑动操作相关的持续时间和压力。在一些实施例中，多媒体组件808包括一个前置摄像头和/或后置摄像头。当装置800处于操作模式，如拍摄模式或视频模式时，前置摄像头和/或后置摄像头可以接收外部的多媒体数据。每个前置摄像头和后置摄像头可以是一个固定的光学透镜系统或具有焦距和光学变焦能力。
音频组件810被配置为输出和/或输入音频信号。例如，音频组件810包括一个麦克风(MIC)，当装置800处于操作模式，如呼叫模式、记录模式和语音识别模式时，麦克风被配置为接收外部音频信号。所接收的音频信号可以被进一步存储在存储器804或经由通信组件816发送。在一些实施例中，音频组件810还包括一个扬声器，用于输出音频信号。
I/O接口812为处理组件802和外围接口模块之间提供接口，上述外围接口模块可以是键盘，点击轮，按钮等。这些按钮可包括但不限于：主页按钮、音量按钮、启动按钮和锁定按钮。
传感器组件814包括一个或多个传感器，用于为装置800提供各个方面的状态评估。例如，传感器组件814可以检测到装置800的打开/关闭状态，组件的相对定位，例如 所述组件为装置800的显示器和小键盘，传感器组件814还可以检测装置800或装置800一个组件的位置改变，用户与装置800接触的存在或不存在，装置800方位或加速/减速和装置800的温度变化。传感器组件814可以包括接近传感器，被配置用来在没有任何的物理接触时检测附近物体的存在。传感器组件814还可以包括光传感器，如CMOS或CCD图像传感器，用于在成像应用中使用。在一些实施例中，该传感器组件814还可以包括加速度传感器，陀螺仪传感器，磁传感器，压力传感器或温度传感器。
通信组件816被配置为便于装置800和其他设备之间有线或无线方式的通信。装置800可以接入基于通信标准的无线网络，如WiFi，2G或3G，或它们的组合。在一个示例性实施例中，通信组件816经由广播信道接收来自外部广播管理系统的广播信号或广播相关信息。在一个示例性实施例中，所述通信组件816还包括近场通信(NFC)模块，以促进短程通信。例如，在NFC模块可基于射频识别(RFID)技术，红外数据协会(IrDA)技术，超宽带(UWB)技术，蓝牙(BT)技术和其他技术来实现。
在示例性实施例中，装置800可以被一个或多个应用专用集成电路(ASIC)、数字信号处理器(DSP)、数字信号处理设备(DSPD)、可编程逻辑器件(PLD)、现场可编程门阵列(FPGA)、控制器、微控制器、微处理器或其他电子元件实现，用于执行上述方法。
在示例性实施例中，还提供了一种包括指令的非临时性计算机可读存储介质，例如包括指令的存储器804，上述指令可由装置800的处理器820执行以完成上述方法。例如，所述非临时性计算机可读存储介质可以是ROM、随机存取存储器(RAM)、CD-ROM、磁带、软盘和光数据存储设备等。
一种非临时性计算机可读存储介质，当所述存储介质中的指令由移动终端的处理器执行时，使得移动终端能够执行一种背光亮度的控制方法，所述方法包括：接收将当前亮度值调整到目标亮度值的控制指令；在当前亮度值大于第一阈值且目标亮度值小于第一阈值时，停止为第一背光灯组的背光灯提供电流，确定第二背光灯组的背光灯达到目标亮度值所需要的目标电流值，并为第二背光灯组的背光灯提供目标电流值。
本领域技术人员在考虑说明书及实践这里公开的发明后，将容易想到本发明的其它实施方案。本申请旨在涵盖本发明的任何变型、用途或者适应性变化，这些变型、用途或者适应性变化遵循本发明的一般性原理并包括本公开未公开的本技术领域中的公知常识或惯用技术手段。说明书和实施例仅被视为示例性的，本发明的真正范围和精神由下面的权利要求指出。
应当理解的是，本发明并不局限于上面已经描述并在附图中示出的精确结构，并且 可以在不脱离其范围进行各种修改和改变。本发明的范围仅由所附的权利要求来限制。

Claims (11)

  1. 一种背光亮度的控制方法，其特征在于，所述方法应用于所述终端内，所述终端包括第一背光灯组和第二背光灯组，所述第一背光灯组和所述第二背光灯组均包含有多个背光灯，所述终端为所述第一背光灯组的背光灯和所述第二背光灯组的背光灯提供电流，所述方法包括：
    接收将当前亮度值调整到目标亮度值的控制指令；
    在所述当前亮度值大于第一阈值且所述目标亮度值小于第一阈值时，停止为所述第一背光灯组的背光灯提供电流，确定所述第二背光灯组的背光灯达到所述目标亮度值所需要的目标电流值，并为所述第二背光灯组的背光灯提供所述目标电流值。
  2. 根据权利要求1所述的背光亮度的控制方法，其特征在于，在所述接收将当前亮度值调整到目标亮度值的控制指令之后，所述方法还包括：
    在所述当前亮度值小于所述第二阈值且所述目标亮度值大于所述第二阈值时，确定所述第一背光灯组的背光灯和所述第二背光灯组的背光灯共同达到所述目标亮度值所需要的目标电流值，并同时为所述第一背光灯组的背光灯和所述第二背光灯组的背光灯提供所述目标电流值，所述第二阈值大于或等于所述第一阈值。
  3. 根据权利要求1所述的背光亮度的控制方法，其特征在于，在所述接收将当前亮度值调整到目标亮度值的控制指令之后，所述方法还包括：
    在所述当前亮度值和所述目标亮度值均大于第一阈值时，确定所述第一背光灯组的背光灯和所述第二背光灯组的背光灯共同达到所述目标亮度值所需要的目标电流值，并同时为所述第一背光灯组的背光灯和所述第二背光灯组的背光灯提供所述目标电流值。
  4. 根据权利要求1所述的背光亮度的控制方法，其特征在于，在所述接收将当前亮度值调整到目标亮度值的控制指令之后，所述方法还包括：
    在所述当前亮度值和所述目标亮度值均小于第一阈值且当前仅为所述第一背光灯组的背光灯提供电流时，确定所述第一背光灯组的背光灯达到所述目标亮度值所需要的目标电流值，并为所述第一背光灯组的背光灯提供所述目标电流值。
  5. 根据权利要求1至4任意一项所述的背光亮度的控制方法，其特征在于，在所述停止为所述第一背光灯组的背光灯提供电流之前，所述方法还包括：
    分别确定所述第一背光灯组的第一总工作时间和所述第二背光灯组的第二总工作时间；
    判断所述第一总工作时间是否大于所述第二总工作时间；
    在所述第一总工作时间大于所述第二总工作时间时，执行所述停止为所述第一背光灯组的背光灯提供电流的步骤；
    在所述第一总工作时间小于或等于所述第二总工作时间时，停止为所述第二背光灯组的背光灯提供电流，确定所述第一背光灯组的背光灯达到所述目标亮度值所需要的目标电流值，并为所述第一背光灯组的背光灯提供所述目标电流值。
  6. 一种背光亮度的控制装置，其特征在于，所述装置包括：
    第一背光灯组和第二背光灯组，所述第一背光灯组和所述第二背光灯组均包含有多个背光灯；
    接收模块，用于接收将当前亮度值调整到目标亮度值的控制指令；
    第一执行模块，用于在所述当前亮度值大于第一阈值且所述目标亮度值小于第一阈值时，停止为所述第一背光灯组的背光灯提供电流，确定所述第二背光灯组的背光灯达到所述目标亮度值所需要的目标电流值，并为所述第二背光灯组的背光灯提供所述目标电流值。
  7. 根据权利要求6所述的背光亮度的控制装置，其特征在于，所述装置还包括：
    第二执行模块，用于在所述当前亮度值小于所述第二阈值且所述目标亮度值大于所述第二阈值时，确定所述第一背光灯组的背光灯和所述第二背光灯组的背光灯共同达到所述目标亮度值所需要的目标电流值，并同时为所述第一背光灯组的背光灯和所述第二背光灯组的背光灯提供所述目标电流值，所述第二阈值大于或等于所述第一阈值。
  8. 根据权利要求6所述的背光亮度的控制装置，其特征在于，所述装置还包括：
    第三执行模块，用于在所述当前亮度值和所述目标亮度值均大于第一阈值时，确定所述第一背光灯组的背光灯和所述第二背光灯组的背光灯共同达到所述目标亮度值所需要的目标电流值，并同时为所述第一背光灯组的背光灯和所述第二背光灯组的背光灯提供所述目标电流值。
  9. 根据权利要求6所述的背光亮度的控制装置，其特征在于，所述装置还包括：
    第四执行模块，用于在所述当前亮度值和所述目标亮度值均小于第一阈值且当前仅为所述第一背光灯组的背光灯提供电流时，确定所述第一背光灯组的背光灯达到所述目标亮度值所需要的目标电流值，并为所述第一背光灯组的背光灯提供所述目标电流值。
  10. 根据权利要求6至9任意一项所述的背光亮度的控制装置，其特征在于，所述装置还包括：
    第一确定模块，用于分别确定所述第一背光灯组的第一总工作时间和所述第二背光灯组的第二总工作时间；
    第一判断模块，用于判断所述第一总工作时间是否大于所述第二总工作时间；
    第五执行模块，用于在所述第一总工作时间大于所述第二总工作时间时，执行所述第一执行模块；在所述第一总工作时间小于或等于所述第二总工作时间时，停止为所述第二背光灯组的背光灯提供电流，确定所述第一背光灯组的背光灯达到所述目标亮度值所需要的目标 电流值，并为所述第一背光灯组的背光灯提供所述目标电流值。
  11. 一种背光亮度的控制装置，其特征在于，包括：
    处理器；
    用于存储处理器可执行指令的存储器；
    其中，所述处理器被配置为：
    接收将当前亮度值调整到目标亮度值的控制指令；
    在所述当前亮度值大于第一阈值且所述目标亮度值小于第一阈值时，停止为所述第一背光灯组的背光灯提供电流，确定所述第二背光灯组的背光灯达到所述目标亮度值所需要的目标电流值，并为所述第二背光灯组的背光灯提供所述目标电流值。
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