WO2019033853A1 - 调节背光源的方法及装置 - Google Patents

调节背光源的方法及装置 Download PDF

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Publication number
WO2019033853A1
WO2019033853A1 PCT/CN2018/092788 CN2018092788W WO2019033853A1 WO 2019033853 A1 WO2019033853 A1 WO 2019033853A1 CN 2018092788 W CN2018092788 W CN 2018092788W WO 2019033853 A1 WO2019033853 A1 WO 2019033853A1
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Prior art keywords
value
brightness
current
emitting device
voltage
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PCT/CN2018/092788
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English (en)
French (fr)
Inventor
刘俊国
姚文泽
孙盛林
朱麾忠
Original Assignee
京东方科技集团股份有限公司
北京京东方专用显示科技有限公司
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Priority to US16/331,441 priority Critical patent/US10789896B2/en
Publication of WO2019033853A1 publication Critical patent/WO2019033853A1/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
    • 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
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
    • 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
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • 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
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • 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
    • 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
    • G09G2320/0633—Adjustment of display parameters for control of overall brightness by amplitude modulation of the brightness of the 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
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

Definitions

  • the present disclosure relates to the field of display technologies, and in particular, to a method and apparatus for adjusting a backlight.
  • the backlight is a kind of light source located behind the liquid crystal display, and its lighting effect will directly affect the visual effect of the liquid crystal display.
  • a backlight of a liquid crystal display generally uses an LED (Light Emitting Diode) backlight.
  • Embodiments of the present disclosure provide a method of adjusting a backlight, comprising: obtaining a value of a parameter of a light emitting device in a backlight; determining an average value according to the acquired value; and when the average value is outside a preset parameter range, The voltage value input to the light emitting device is adjusted.
  • the light emitting device comprises at least one light string.
  • the parameter is a current
  • the adjusting the voltage value input to the light emitting device includes: increasing a voltage value input to the light emitting device when the average value is less than a minimum rated current value of the preset current range And decreasing a voltage value input to the light emitting device when the average value is greater than a maximum rated current value of the preset current range.
  • the increasing the voltage value input to the light emitting device comprises: determining a first adjustment amount of a duty ratio of the voltage control signal according to a current difference between the average value and the minimum rated current value; The duty cycle of the voltage control signal is increased by the first adjustment amount.
  • the reducing the voltage value input to the light emitting device comprises: determining a second adjustment amount of the duty ratio of the voltage control signal according to a current difference between the average value and the maximum rated current value And decreasing a duty ratio of the voltage control signal by the second adjustment amount.
  • the parameter is brightness
  • the adjusting the voltage value input to the light emitting device includes: increasing a voltage value input to the light emitting device when the average value is less than a minimum rated brightness value in a preset brightness range And decreasing a voltage value input to the light emitting device when the average value is greater than a maximum rated brightness value of the preset brightness range.
  • the increasing the voltage value input to the light emitting device comprises: determining a third adjustment amount of a duty ratio of the voltage control signal according to a brightness difference value between the average value and the minimum rated brightness value; The duty cycle of the voltage control signal is increased by the third adjustment amount.
  • the reducing the voltage value input to the light emitting device comprises: determining a fourth adjustment amount of the duty ratio of the voltage control signal according to a brightness difference value between the average value and the maximum rated brightness value And decreasing a duty ratio of the voltage control signal by the fourth adjustment amount.
  • An embodiment of the present disclosure further provides an apparatus for adjusting a backlight, comprising: a detecting unit configured to acquire a value of a parameter of a light emitting device in a backlight; a determining unit configured to determine an average value according to the acquired value; and a control unit, It is configured to adjust a voltage value input to the light emitting device when the average value is outside a preset parameter range.
  • the parameter is a current
  • the control unit is configured to increase a voltage value input to the light emitting device when the average value is less than a minimum rated current value in a preset current range; When the maximum rated current value in the preset current range is greater than, the voltage value input to the light emitting device is reduced.
  • control unit is configured to: when the average value is less than a minimum rated current value in the preset current range, determine a voltage according to a current difference between the average value and the minimum rated current value a first adjustment amount of a duty ratio of the control signal; and increasing a duty ratio of the voltage control signal by the first adjustment amount.
  • control unit is configured to: according to a current difference between the average value and the maximum rated current value, when the average value is greater than a maximum rated current value of the preset current range, Determining a second adjustment amount of a duty ratio of the voltage control signal; and decreasing a duty ratio of the voltage control signal by the second adjustment amount.
  • the light emitting device comprises at least one light string;
  • the detecting unit comprises at least one current detector, and the at least one current detector is connected in one-to-one correspondence with the at least one light string.
  • the parameter is brightness
  • the control unit is configured to increase a voltage value input to the light emitting device when the average value is less than a minimum rated brightness value in a preset brightness range; When the maximum rated brightness value in the preset brightness range is greater than, the voltage value input to the light emitting device is reduced.
  • control unit is configured to: when the average value is less than a minimum rated brightness value in the preset brightness range, determine a voltage according to a brightness difference between the average value and the minimum rated brightness value a third adjustment amount of the duty ratio of the control signal; and increasing a duty ratio of the voltage control signal by the third adjustment amount.
  • control unit is configured to: according to a brightness difference between the average value and the maximum rated brightness value, when the average value is greater than a maximum rated brightness value of the preset brightness range, Determining a fourth adjustment amount of a duty ratio of the voltage control signal; and decreasing a duty ratio of the voltage control signal by the fourth adjustment amount.
  • the light emitting device comprises at least one light string;
  • the detecting unit comprises a light sensor, the light sensor configured to detect the brightness of the at least one light string.
  • FIG. 1 is a schematic structural view of a backlight in a related art
  • FIG. 2 is a flowchart of a method for adjusting a backlight provided by an embodiment of the present disclosure
  • FIG. 3 is a schematic diagram of a correspondence between a duty ratio of a voltage control signal and a current flowing through a light string according to an embodiment of the present disclosure
  • FIG. 4 is a schematic structural diagram of an apparatus for adjusting a backlight according to an embodiment of the present disclosure
  • FIG. 5 is a schematic structural diagram of an apparatus for adjusting a backlight according to another embodiment of the present disclosure.
  • the light strings Ln are both connected between the power supply voltage V0 and the ground GND, and are powered by a voltage difference between the power supply voltage V0 and the ground GND to achieve light emission.
  • the backlight when the backlight is used when the power supply voltage is unstable or the ambient temperature is high, the current flowing through the light string Ln changes, which causes the brightness of the backlight to change and is unstable, which affects the display effect of the liquid crystal display.
  • the brightness of the backlight is seriously attenuated due to the loss caused by the long-term operation of the LED in the light string, which affects the display effect of the liquid crystal display. Therefore, it is desirable to adjust the brightness of the backlight when it is applied in different situations.
  • An embodiment of the present disclosure provides a method for adjusting a backlight. As shown in FIG. 2, the method for adjusting a backlight may include the following steps:
  • the parameter may be set to one of a plurality of physical quantities that can be detected by the backlight, wherein the physical quantity may be, for example, a current flowing through the light emitting device, a brightness of the light emitting device, or the like.
  • the physical quantity may be, for example, a current flowing through the light emitting device, a brightness of the light emitting device, or the like.
  • the light emitting devices in the backlight are typically LEDs.
  • various embodiments of the present disclosure will be described in detail by taking an LED as an example.
  • the power supply voltage of the input LED is unstable, for example, the power supply voltage is increased or decreased, and the current flowing through the LED deviates from the rated current range.
  • the brightness of the backlight is changed significantly, which affects the stability of the backlight brightness. Therefore, the brightness of the backlight can be adjusted by detecting the current flowing through the LED, and the display effect of the liquid crystal display can be improved when the backlight is applied to the liquid crystal display.
  • the brightness of the backlight can be adjusted by detecting the current flowing through the LED or detecting the luminance of the LED to improve the display effect of the liquid crystal display.
  • the LED's illumination is attenuated due to the long-time use of the LED, for example, the loss caused by the use of the three-year, five-year, etc., resulting in a serious degradation of the backlight brightness.
  • the brightness of the backlight can be preferentially selected to meet the brightness requirement required for the liquid crystal display to display an image, so that the brightness of the backlight can be adjusted by detecting the brightness of the LED light to improve the display effect of the liquid crystal display.
  • the value of the parameters of the light emitting device in the backlight may be acquired, for example, in real time, thereby adjusting the brightness of the backlight in real time.
  • the light emitting device comprises at least one light string.
  • the light-emitting device may also be a single light-emitting device or a single light string, in which case the values of the parameters of the light-emitting device may be acquired multiple times to obtain the average value.
  • the current flowing through the LED is taken as a parameter, that is, the parameter is a current.
  • the preset current range may be a range of I 0 ⁇ ⁇ I, where I 0 represents the average value of the rated current values of all the strings in the backlight, and ⁇ I represents a value at which I 0 can deviate within the error tolerance range.
  • I 0 represents the average value of the rated current values of all the strings in the backlight
  • ⁇ I represents a value at which I 0 can deviate within the error tolerance range.
  • the specific values of I 0 and ⁇ I need to be determined according to the actual application environment, which is not limited herein.
  • the parameter is a current
  • the adjusting the voltage value input to the light emitting device includes: the minimum rated current in the average value being less than the preset current range When the value is increased, the voltage value input to the light emitting device is increased; when the average value is greater than the maximum rated current value in the preset current range, the voltage value input to the light emitting device is decreased.
  • the backlight when the parameter is current, the backlight includes 6 light strings L1 to L6, V0 represents the power supply voltage of the input 6 light strings, and I min represents the minimum rated value in the preset rated value range of the current, and I max represents The maximum rated value in the preset range of current ratings is illustrated.
  • the current values I 1 , I 2 , I 3 , I 4 , I 5 , I 6 are also increased, thereby Increase so that Adjust to a preset range of values that meet the current, thereby making The preset range of current ratings is met, thereby adjusting the brightness of the backlight to stabilize the brightness of the backlight.
  • the current values I 1 , I 2 , I 3 , I 4 , I 5 , and I 6 of -L6 are also reduced, thereby making Reduce so that Adjust to a preset range of values that meet the current, thereby making The preset range of current ratings is met, thereby adjusting the brightness of the backlight to stabilize the brightness of the backlight.
  • the brightness of the LED illumination is taken as a parameter, that is, the parameter is the brightness.
  • the preset brightness range may be a range of Lm 0 ⁇ ⁇ Lm, where Lm 0 represents an average value of the rated brightness values of all the light strings in the backlight, and ⁇ Lm represents a value at which Lm 0 can deviate within the error tolerance range.
  • Lm 0 and ⁇ Lm need to be determined according to the actual application environment, which is not limited herein.
  • the parameter is brightness
  • the adjusting the voltage value input to the light emitting device includes: when the average value is less than a minimum rated brightness value in a preset brightness range. And increasing a voltage value input to the light emitting device; and decreasing a voltage value input to the light emitting device when the average value is greater than a maximum rated brightness value of the preset brightness range.
  • the backlight when the parameter is brightness, the backlight includes 6 light strings L1 to L6, V0 represents the voltage of the input 6 light strings, Lm min represents the minimum rated value of the preset brightness range of the brightness, and Lm max represents the brightness.
  • the maximum rating in the preset rating range is illustrated.
  • the current values I 1 , I 2 , I 3 , I 4 , I 5 , and I 6 increase, increasing the brightness of the six strings L1 to L6, thereby Increase so that Adjust to the direction of the preset rating range that satisfies the brightness so that The preset range of brightness is satisfied, thereby adjusting the brightness of the backlight to stabilize the brightness of the backlight.
  • the six light strings L1 can be caused to flow.
  • the current values I 1 , I 2 , I 3 , I 4 , I 5 , and I 6 of -L6 are decreased, and the brightness of the six light strings L1 to L6 is decreased, thereby making Reduce so that Adjust to the direction of the preset rating range that satisfies the brightness so that The preset range of brightness is satisfied, thereby adjusting the brightness of the backlight to stabilize the brightness of the backlight.
  • the parameter is a current
  • the increasing the voltage value input to the light emitting device comprises: determining a duty ratio of the voltage control signal according to a current difference between the average value and the minimum rated current value a first adjustment amount; increasing a duty ratio of the voltage control signal by the first adjustment amount.
  • the voltage control signal is a PWM (Pulse Width Modulation) signal that can modulate its pulse width
  • the duty ratio of the voltage control signal is the time occupied by the effective pulse signal in the voltage control signal. ratio.
  • the effective pulse signal of the voltage control signal is used to control the magnitude of the voltage value output to the string, and the greater the duty ratio of the voltage control signal, the greater the power output to the string.
  • a control signal for controlling the magnitude of the voltage value output to the string can be used as the voltage control signal.
  • a correspondence relationship between a current difference between an average value of the current and a minimum rated value and a first adjustment amount of the duty ratio is stored in advance.
  • the corresponding relationship is that the larger the current difference between the average value of the current and the minimum rated value, the larger the first adjustment amount of the corresponding duty ratio.
  • the correspondence between the current difference between the average value of the pre-stored current and the minimum rated value and the first adjustment amount of the duty ratio may be a correspondence obtained by a person skilled in the art according to experience, and It needs to be determined according to the actual application environment, and will not be described here.
  • Figure 3 is a diagram showing the correspondence between the duty ratio of the voltage control signal and the current flowing through the string, wherein the abscissa represents the difference between unit 1 and the duty ratio d, and the ordinate represents the current value. I.
  • the larger the duty ratio of the voltage control signal the larger the current flowing through the string.
  • I min 59.5 mA.
  • the current difference from the minimum rating I min is 9.5 mA, and according to the current difference of 9.5 mA, the first adjustment amount ⁇ d 1 whose duty ratio needs to be adjusted can be obtained. Adjusting the duty ratio of the voltage control signal according to the first adjustment amount ⁇ d 1 to increase the duty ratio of the voltage control signal by ⁇ d 1 , so that the duty ratio of the voltage control signal after increasing ⁇ d 1 can be allowed in the error.
  • the duty ratio of the voltage control signal corresponding to I 0 is increased in the range, so that the voltage value of each input light string determined according to the voltage control signal after adjusting the duty ratio is increased, thereby increasing the current flowing through each light string. , so that the average value of the current flowing through each string is adjusted It tends to I 0 within the range allowed by the error.
  • FIG. 3 is only an exemplary diagram given, which is only used to illustrate the correspondence between the duty ratio of a voltage control signal and the current flowing through the string, and is not used to limit the present.
  • the parameter is a current
  • the reducing the voltage value input to the light emitting device comprises: determining a duty of the voltage control signal according to a current difference between the average value and the maximum rated current value a second adjustment amount of the ratio; decreasing a duty ratio of the voltage control signal by the second adjustment amount.
  • the voltage control signal is a PWM signal that can modulate its pulse width
  • the duty ratio of the voltage control signal is the ratio of the time that the effective pulse signal occupies within the voltage control signal.
  • the effective pulse signal of the voltage control signal is used to control the magnitude of the voltage value output to the string, and the greater the duty ratio of the voltage control signal, the greater the power output to the string.
  • a control signal for controlling the magnitude of the voltage value output to the string can be used as the voltage control signal.
  • a correspondence relationship between a current difference between the average value of the current and the maximum rated value and a second adjustment amount of the duty ratio is stored in advance.
  • the corresponding relationship is that the larger the current difference between the average value of the current and the maximum rated value, the larger the second adjustment amount of the corresponding duty ratio.
  • the correspondence between the current difference between the average value of the pre-stored current and the maximum rated value and the second adjustment amount of the duty ratio may be a correspondence obtained by a person skilled in the art according to experience, and It needs to be determined according to the actual application environment, and will not be described here.
  • the larger the duty ratio of the voltage control signal the larger the current flowing through the string.
  • the current difference from the maximum rating I max is 9.5 mA, and according to the current difference of 9.5 mA, the second adjustment amount ⁇ d 2 whose duty ratio needs to be adjusted can be obtained.
  • the allowable range tends to the duty ratio of the voltage control signal corresponding to I 0 , so that the voltage value of each input string determined according to the voltage control signal after adjusting the duty ratio is reduced, thereby causing the light string to flow through
  • the current is reduced so that the adjusted average of the current flowing through each string It tends to I 0 within the range allowed by the error.
  • FIG. 3 is only an exemplary diagram given, which is only used to illustrate the correspondence between the duty ratio of a voltage control signal and the current flowing through the string, and is not used to limit the present.
  • the parameter is brightness
  • the increasing the voltage value input to the light emitting device comprises: determining a duty ratio of the voltage control signal according to a difference in brightness between the average value and the minimum rated brightness value a third adjustment amount; increasing a duty ratio of the voltage control signal by the third adjustment amount.
  • the voltage control signal is a PWM signal that can modulate its pulse width
  • the duty ratio of the voltage control signal is the ratio of the time that the effective pulse signal occupies within the voltage control signal.
  • the effective pulse signal of the voltage control signal is used to control the magnitude of the voltage value output to the string, and the greater the duty ratio of the voltage control signal, the greater the power output to the string.
  • a control signal for controlling the magnitude of the voltage value output to the string can be used as the voltage control signal.
  • a correspondence relationship between the luminance difference value between the average value and the minimum rated value of the luminance and the third adjustment amount of the duty ratio is stored in advance.
  • the corresponding relationship is that the larger the luminance difference between the average value of the luminance and the minimum rated value, the larger the third adjustment amount of the corresponding duty ratio.
  • the correspondence between the luminance difference between the average value of the pre-stored luminance and the minimum rating and the third adjustment amount of the duty ratio may be a correspondence obtained by a person skilled in the art according to experience, and It needs to be determined according to the actual application environment, and will not be described here.
  • the third adjustment amount ⁇ d 3 whose duty ratio needs to be adjusted can be obtained according to the luminance difference value. Adjusting the duty ratio of the voltage control signal according to the third adjustment amount ⁇ d 3 to increase the duty ratio of the voltage control signal by ⁇ d 3 , so that the duty ratio of the voltage control signal after increasing ⁇ d 3 can be allowed in error
  • the duty ratio of the voltage control signal corresponding to Lm 0 is increased in the range, so that the voltage value of each input light string determined according to the voltage control signal after adjusting the duty ratio is increased, thereby increasing the current flowing through each light string. , so that the average brightness of the adjusted strings is It tends to Lm 0 within the range allowed by the error.
  • the parameter is brightness
  • the reducing the voltage value input to the light emitting device comprises: determining a duty of the voltage control signal according to a brightness difference between the average value and the maximum rated brightness value a fourth adjustment amount of the ratio; decreasing the duty ratio of the voltage control signal by the fourth adjustment amount.
  • the voltage control signal is a PWM signal that can modulate its pulse width
  • the duty ratio of the voltage control signal is the ratio of the time that the effective pulse signal occupies within the voltage control signal.
  • the effective pulse signal of the voltage control signal is used to control the magnitude of the voltage value output to the string, and the greater the duty ratio of the voltage control signal, the greater the power output to the string.
  • a control signal for controlling the magnitude of the voltage value output to the string can be used as the voltage control signal.
  • a correspondence relationship between the luminance difference value between the average value and the maximum rated value of the luminance and the fourth adjustment amount of the duty ratio is stored in advance.
  • the corresponding relationship is that the greater the luminance difference between the average value of the luminance and the maximum rated value, the larger the fourth adjustment amount of the corresponding duty ratio.
  • the correspondence between the luminance difference between the average value of the pre-stored luminance and the maximum rated value and the fourth adjustment amount of the duty ratio may be a correspondence obtained by a person skilled in the art according to experience. The design is determined according to the actual application environment, and will not be described here.
  • the fourth adjustment amount ⁇ d 4 whose duty ratio needs to be adjusted can be obtained according to the luminance difference value. Adjusting the duty ratio of the voltage control signal according to the fourth adjustment amount ⁇ d 4 to reduce the duty ratio of the voltage control signal by ⁇ d 4 , so that the duty ratio of the voltage control signal after decreasing ⁇ d 4 can be made to be in error
  • the allowable range tends to the duty ratio of the voltage control signal corresponding to Lm 0 , so that the voltage value of each input string determined according to the voltage control signal after adjusting the duty ratio is reduced, thereby causing the light string to flow through
  • the current is reduced so that the average brightness of the adjusted strings is averaged It tends to Lm 0 within the range allowed by the error.
  • the embodiment of the present disclosure further provides a device for adjusting a backlight.
  • the method includes: a detecting unit 10 configured to acquire a value of a parameter of a light emitting device (L1 - LN) in a backlight;
  • the unit 20 is configured to determine an average value based on the acquired value;
  • the control unit 30 is configured to adjust a voltage value input to the light emitting device when the average value is outside a preset parameter range.
  • the apparatus for adjusting a backlight may set a parameter to one of a plurality of physical quantities that can be detected by the backlight, wherein the physical quantity may be, for example, a current flowing through the light emitting device, a brightness of the light emitting device, or the like.
  • the physical quantity may be, for example, a current flowing through the light emitting device, a brightness of the light emitting device, or the like.
  • the current flowing through the LED is taken as a parameter, that is, the parameter is a current.
  • the preset current range may be a range of I 0 ⁇ ⁇ I, where I 0 represents the average value of the rated current values of all the strings in the backlight, and ⁇ I represents a value at which I 0 can deviate within the error tolerance range.
  • I 0 represents the average value of the rated current values of all the strings in the backlight
  • ⁇ I represents a value at which I 0 can deviate within the error tolerance range.
  • the specific values of I 0 and ⁇ I need to be determined according to the actual application environment, which is not limited herein.
  • the parameter is a current
  • the control unit is configured to increase the voltage input to the light emitting device when the average value is less than the minimum rated current value in the preset current range. a value; when the average value is greater than a maximum rated current value of the preset current range, reducing a voltage value input to the light emitting device.
  • control unit is configured to: according to a current difference between the average value and the minimum rated current value, when the average value is less than a minimum rated current value of the preset current range, Determining a first adjustment amount of a duty ratio of the voltage control signal; and increasing a duty ratio of the voltage control signal by the first adjustment amount.
  • a correspondence between a current difference between an average value of the current and a minimum rated value and a first adjustment amount of the duty ratio is stored in advance. The corresponding relationship is that the larger the current difference between the average value of the current and the minimum rated value, the larger the first adjustment amount of the corresponding duty ratio.
  • the correspondence between the current difference between the average value of the pre-stored current and the minimum rated value and the first adjustment amount of the duty ratio may be a correspondence obtained by a person skilled in the art according to experience, and It needs to be determined according to the actual application environment, and will not be described here.
  • a correspondence between a current difference between an average value of the current and a maximum rated value and a second adjustment amount of the duty ratio is stored in advance. The corresponding relationship is that the larger the current difference between the average value of the current and the maximum rated value, the larger the second adjustment amount of the corresponding duty ratio.
  • the correspondence between the current difference between the average value of the pre-stored current and the maximum rated value and the second adjustment amount of the duty ratio may be a correspondence obtained by a person skilled in the art according to experience, and It needs to be determined according to the actual application environment, and will not be described here.
  • the light emitting device includes at least one light string (L1 to LN); the detecting unit 10 includes at least one current. Detectors (LB1 to LBN), the at least one current detector being connected in one-to-one correspondence with the at least one light string. Specifically, each current detector can be used to detect the value of the current of the light string connected thereto in real time, and transmit the value of the detected current to the determining unit 20. In a specific implementation, a conventional current detector can be used as the current detector in the embodiment of the present disclosure, and details are not described herein.
  • the brightness of the LED illumination is taken as a parameter, that is, the parameter is the brightness.
  • the preset range of brightness corresponding to the brightness may be in the range of Lm 0 ⁇ ⁇ Lm, where Lm 0 represents the average value of the rated brightness values of all the strings in the backlight, and ⁇ Lm represents the value that Lm 0 can deviate within the error tolerance range. .
  • the specific values of Lm 0 and ⁇ Lm need to be determined according to the actual application environment, which is not limited herein.
  • the parameter is brightness
  • the control unit is configured to: when the average value is less than a minimum rated brightness value of the preset brightness range, increase the input a voltage value of the light emitting device; when the average value is greater than a maximum rated brightness value of the preset brightness range, reducing a voltage value input to the light emitting device.
  • the control unit is configured to: according to the brightness difference between the average value and the minimum rated brightness value, when the average value is less than a minimum rated brightness value of the preset brightness range, Determining a third adjustment amount of a duty ratio of the voltage control signal; and increasing a duty ratio of the voltage control signal by the third adjustment amount.
  • a correspondence between a luminance difference value between the average value and the minimum rated value of the luminance and a third adjustment amount of the duty ratio is stored in advance. The corresponding relationship is that the larger the luminance difference between the average value of the luminance and the minimum rated value, the larger the third adjustment amount of the corresponding duty ratio.
  • the correspondence between the luminance difference between the average value of the pre-stored luminance and the minimum rating and the third adjustment amount of the duty ratio may be a correspondence obtained by a person skilled in the art according to experience, and It needs to be determined according to the actual application environment, and will not be described here.
  • control unit is configured to: according to a brightness difference between the average value and the maximum rated brightness value, when the average value is greater than a maximum rated brightness value of the preset brightness range a value, a fourth adjustment amount of the duty ratio of the voltage control signal is determined; and a duty ratio of the voltage control signal is decreased by the fourth adjustment amount.
  • a correspondence between a luminance difference value between an average value of the luminance and a maximum rated value and a fourth adjustment amount of the duty ratio is stored in advance. The corresponding relationship is that the greater the luminance difference between the average value of the luminance and the maximum rated value, the larger the fourth adjustment amount of the corresponding duty ratio.
  • the correspondence between the luminance difference between the average value of the pre-stored luminance and the maximum rated value and the fourth adjustment amount of the duty ratio may be a correspondence obtained by a person skilled in the art according to experience, and It needs to be determined according to the actual application environment, and will not be described here.
  • the light emitting device includes at least one light string (L1 to LN); the detecting unit 10 includes a light sensor LS configured to detect the at least one light The luminance of the string (L1 to LN) is transmitted to the determination unit 20 by the value of the detected luminance.
  • a conventional light sensor may be used as the light sensor in the embodiment of the present disclosure, which is not described herein.
  • various "units” and “modules” in the embodiments may be implemented by a computer or a combination of a computer and appropriate sensors, each of which may be processed, for example, by a processor in the computer. to fulfill.
  • the determining unit 20 may include a first processor formed by combining software and hardware.
  • the first processor is configured to determine an average of the parameters based on the respective values of the detected parameters.
  • the specific structure of the first processor needs to be determined according to the actual application environment, which is not limited herein.
  • control unit 30 may include a second processor formed by combining software and hardware.
  • the second processor is configured to adjust a voltage value input to each of the light strings when it is determined that the average value of the parameters does not satisfy the preset rated value range of the parameter.
  • the specific structure of the second processor needs to be determined according to the actual application environment, which is not limited herein.
  • the method and apparatus for adjusting a backlight may set a parameter to one of a plurality of detectable physical quantities that the backlight has, wherein the physical quantity may be, for example, a current flowing through the light emitting device, and a brightness of the light emitting device. Wait. Obtaining an average value of the parameter according to a value of the parameter detected in real time, and adjusting a voltage value input to the light emitting device to adjust a current flowing through the light emitting device when the average value is outside a preset parameter range, Thereby adjusting the brightness of the backlight.
  • the brightness of the backlight can be adjusted in different ways so that the brightness of the backlight can be stably illuminated in different environments.

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Abstract

一种调节背光源的方法及装置。可以将参数设置为背光源具有的多个可被检测的物理量中的一个，其中物理量例如可以为流过发光器件的电流、发光器件的亮度等。根据实时检测到的参数的数值得到参数的平均值，当平均值在预设参数范围之外时，调整输入发光器件的电压值， 以调整流过发光器件的电流，从而调节背光源的亮度。 由此，可以采用不同的方式调节背光源的亮度，以使背光源的亮度可以在不同环境下稳定的发光。

Description

调节背光源的方法及装置
相关申请
本申请要求保护在2017年8月18日提交的申请号为201710711889.8的中国专利申请的优先权，该申请的全部内容以引用的方式结合到本文中。
技术领域
本公开涉及显示技术领域，特别涉及一种调节背光源的方法及装置。
背景技术
背光源是位于液晶显示器背后的一种光源，它的发光效果将直接影响液晶显示器的视觉效果。目前液晶显示器中的背光源一般使用的是LED(Light Emitting Diode，发光二极管)背光源。
公开内容
本公开实施例提供了一种调节背光源的方法，包括：获取背光源中发光器件的参数的数值；根据获取的数值确定平均值；以及当所述平均值在预设参数范围之外时，调整输入所述发光器件的电压值。
可选地，所述发光器件包括至少一个灯串。
可选地，所述参数为电流；所述调整输入所述发光器件的电压值包括：在所述平均值小于预设电流范围中的最小额定电流值时，增加输入所述发光器件的电压值；在所述平均值大于所述预设电流范围中的最大额定电流值时，减小输入所述发光器件的电压值。
可选地，所述增加输入所述发光器件的电压值包括：根据所述平均值与所述最小额定电流值之间的电流差值，确定电压控制信号的占空比的第一调整量；将所述电压控制信号的占空比增加所述第一调整量。
可选地，所述减小输入所述发光器件的电压值包括：根据所述平均值与所述最大额定电流值之间的电流差值，确定电压控制信号的占空比的第二调整量；将所述电压控制信号的占空比减小所述第二调整 量。
可选地，所述参数为亮度；所述调整输入所述发光器件的电压值包括：在所述平均值小于预设亮度范围中的最小额定亮度值时，增加输入所述发光器件的电压值；在所述平均值大于所述预设亮度范围中的最大额定亮度值时，减小输入所述发光器件的电压值。
可选地，所述增加输入所述发光器件的电压值包括：根据所述平均值与所述最小额定亮度值之间的亮度差值，确定电压控制信号的占空比的第三调整量；将所述电压控制信号的占空比增加所述第三调整量。
可选地，所述减小输入所述发光器件的电压值包括：根据所述平均值与所述最大额定亮度值之间的亮度差值，确定电压控制信号的占空比的第四调整量；将所述电压控制信号的占空比减小所述第四调整量。
本公开实施例还提供了一种调节背光源的装置，包括：检测单元，配置为获取背光源中发光器件的参数的数值；确定单元，配置为根据获取的数值确定平均值；以及控制单元，配置为当所述平均值在预设参数范围之外时，调整输入所述发光器件的电压值。
可选地，所述参数为电流；所述控制单元配置为：在所述平均值小于预设电流范围中的最小额定电流值时，增加输入所述发光器件的电压值；在所述平均值大于所述预设电流范围中的最大额定电流值时，减小输入所述发光器件的电压值。
可选地，所述控制单元配置为：在所述平均值小于预设电流范围中的最小额定电流值时，根据所述平均值与所述最小额定电流值之间的电流差值，确定电压控制信号的占空比的第一调整量；以及将所述电压控制信号的占空比增加所述第一调整量。
可选地，所述控制单元配置为：在所述平均值大于所述预设电流范围中的最大额定电流值时，根据所述平均值与所述最大额定电流值之间的电流差值，确定电压控制信号的占空比的第二调整量；以及将所述电压控制信号的占空比减小所述第二调整量。
可选地，所述发光器件包括至少一个灯串；所述检测单元包括至少一个电流检测器，所述至少一个电流检测器与所述至少一个灯串一一对应地连接。
可选地，所述参数为亮度；所述控制单元配置为：在所述平均值小于预设亮度范围中的最小额定亮度值时，增加输入所述发光器件的电压值；在所述平均值大于所述预设亮度范围中的最大额定亮度值时，减小输入所述发光器件的电压值。
可选地，所述控制单元配置为：在所述平均值小于预设亮度范围中的最小额定亮度值时，根据所述平均值与所述最小额定亮度值之间的亮度差值，确定电压控制信号的占空比的第三调整量；以及将所述电压控制信号的占空比增加所述第三调整量。
可选地，所述控制单元配置为：在所述平均值大于所述预设亮度范围中的最大额定亮度值时，根据所述平均值与所述最大额定亮度值之间的亮度差值，确定电压控制信号的占空比的第四调整量；以及将所述电压控制信号的占空比减小所述第四调整量。
可选地，所述发光器件包括至少一个灯串；所述检测单元包括光线传感器，所述光线传感器配置为检测所述至少一个灯串的亮度。
附图说明
图1为相关技术中背光源的结构示意图；
图2为本公开实施例提供的调节背光源的方法的流程图；
图3为本公开实施例提供的一种电压控制信号的占空比与流过灯串的电流之间的对应关系的示意图；
图4为本公开实施例提供的调节背光源的装置的结构示意图；以及
图5为本公开另一实施例提供的调节背光源的装置的结构示意图。
具体实施方式
为了使本公开的目的，技术方案和优点更加清楚，下面结合附图，对本公开实施例提供的调节背光源的方法及装置的具体实施方式进行详细地说明。应当理解，下面所描述的实施例仅用于说明和解释本公开，并不用于限定本公开。并且在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
在相关技术中，如图1所示，背光源一般包括多个LED灯串Ln(n＝1、2、3...N，N为正整数)，每个灯串Ln串联相同数量的LED。 这些灯串Ln均连接于电源电压V0与接地端GND之间，采用电源电压V0与接地端GND之间的电压差供电以实现发光。然而，背光源在电源电压不稳定或环境温度较高下使用时，流过灯串Ln的电流会发生变化，从而导致背光源的亮度会发生变化而不稳定，影响液晶显示器的显示效果。或者，在流过灯串的电流稳定时，由于灯串中的LED长期工作带来的损耗，导致背光源亮度衰减严重，影响液晶显示器的显示效果。因此，希望在不同情况下应用背光源时均可以对其进行亮度调节。
本公开实施例提供了一种调节背光源的方法，如图2所示，该调节背光源的方法可以包括以下步骤：
S201、获取背光源中发光器件的参数的数值；
S202、根据检测到的参数的各数值确定参数的平均值；
S203、在判断参数的平均值不满足参数的预设额定值范围时，调整输入各灯串的电压值。
本公开实施例提供的调节背光源的方法，可以将参数设置为背光源具有的多个可被检测的物理量中的一个，其中物理量例如可以为流过发光器件的电流、发光器件的亮度等。根据实时检测到的参数的数值得到该参数的平均值，当所述平均值在预设参数范围之外时，调整输入所述发光器件的电压值，以调整流过所述发光器件的电流，从而调节背光源的亮度。由此，可以采用不同的方式调节背光源的亮度，以使背光源的亮度可以在不同环境下稳定的发光。
背光源中的发光器件通常为LED。以下以LED为例，对本公开的各个实施例进行详细说明。在实际应用中，由于背光源中的LED自身具有额定电流范围和额定亮度范围，在输入LED的电源电压不稳定，例如电源电压增加或减小，会使得流过LED的电流偏离额定电流范围，导致背光源的发光亮度变化较明显，从而会影响背光源发光亮度的稳定性。因此可以通过检测流过LED的电流来对背光源的亮度进行调节，在背光源应用于液晶显示器中时，可以改善液晶显示器的显示效果。或者，在背光源处于高温环境下应用时，由于LED特性使得流过其的电流会衰减，导致流过LED的电流也会偏离额定电流范围，从而导致背光源发光亮度出现衰减。因此可以通过检测流过LED的电流或检测LED的发光亮度来对背光源的亮度进行调节，以改善液晶显示器的显 示效果。然而在流过LED的电流满足额定电流范围时，由于LED使用时间较长，例如使用3年、5年等多年时带来的损耗，使得LED的发光出现衰减，导致背光源亮度衰减严重。此时可以优先选择提高背光源的亮度以满足液晶显示器显示图像所需的亮度需求，这样可以通过检测LED发光的亮度来对背光源的亮度进行调节，以改善液晶显示器的显示效果。
在一些实施例中，在步骤S201中，可以例如实时地获取背光源中发光器件的参数的数值，从而实时地调整背光源的亮度。
在一些实施例中，所述发光器件包括至少一个灯串。所述发光器件也可以是单个发光器件或单个灯串，在这种情况下，可以多次获取所述发光器件的参数的数值，从而得到所述平均值。
在具体实施时，在本公开实施例提供的调节方法中，以流过LED的电流作为参数，即参数为电流。预设电流范围可以为I 0±ΔI组成的范围，其中，I 0代表背光源中所有灯串的额定电流值的平均值，ΔI代表在误差允许范围内I 0可以偏离的数值。在实际应用中，I 0和ΔI的具体数值需要根据实际应用环境来确定，在此不作限定。
在具体实施时，在本公开实施例提供的调节方法中，所述参数为电流；所述调整输入所述发光器件的电压值包括：在所述平均值小于预设电流范围中的最小额定电流值时，增加输入所述发光器件的电压值；在所述平均值大于所述预设电流范围中的最大额定电流值时，减小输入所述发光器件的电压值。
具体地，参数为电流时，以背光源包括6个灯串L1～L6、V0代表输入6个灯串的电源电压、I min代表电流的预设额定值范围中的最小额定值、I max代表电流的预设额定值范围中的最大额定值为例进行说明。通过实时检测背光源中6个灯串L1～L6分别对应的电流的数值，可以得到6个电流值：I 1、I 2、I 3、I 4、I 5、I 6，这6个电流值的平均值
Figure PCTCN2018092788-appb-000001
即为
Figure PCTCN2018092788-appb-000002
在
Figure PCTCN2018092788-appb-000003
时，增加输入这6个灯串L1～L6的电压值V0，在将增加后的电压值V0输入到这6个灯串L1～L6中时，可以使流过这6个灯串L1～L6的电流值I 1、I 2、I 3、I 4、I 5、I 6也增加，从而使
Figure PCTCN2018092788-appb-000004
增加，以使
Figure PCTCN2018092788-appb-000005
向满足电流的预设额定值范围方向进行调节，从 而使
Figure PCTCN2018092788-appb-000006
满足电流的预设额定值范围，进而实现调节背光源亮度，以使背光源亮度稳定的效果。在
Figure PCTCN2018092788-appb-000007
时，减小输入这6个灯串L1～L6的电压值V0，在将减小后的电压值V0输入到这6个灯串L1～L6中时，可以使流过这6个灯串L1～L6的电流值I 1、I 2、I 3、I 4、I 5、I 6也减小，从而使
Figure PCTCN2018092788-appb-000008
减小，以使
Figure PCTCN2018092788-appb-000009
向满足电流的预设额定值范围方向进行调节，从而使
Figure PCTCN2018092788-appb-000010
满足电流的预设额定值范围，进而实现调节背光源亮度，以使背光源亮度稳定的效果。
在具体实施时，在本公开实施例提供的调节方法中，以LED发光的亮度作为参数，即参数为亮度。预设亮度范围可以为Lm 0±ΔLm组成的范围，其中，Lm 0代表背光源中所有灯串的额定亮度值的平均值，ΔLm代表在误差允许范围内Lm 0可以偏离的数值。在实际应用中，Lm 0和ΔLm的具体数值需要根据实际应用环境来确定，在此不作限定。
在具体实施时，在本公开实施例提供的调节方法中，参数为亮度，所述调整输入所述发光器件的电压值包括：在所述平均值小于预设亮度范围中的最小额定亮度值时，增加输入所述发光器件的电压值；在所述平均值大于所述预设亮度范围中的最大额定亮度值时，减小输入所述发光器件的电压值。
具体地，参数为亮度时，以背光源包括6个灯串L1～L6、V0代表输入6个灯串的电压、Lm min代表亮度的预设额定值范围中的最小额定值、Lm max代表亮度的预设额定值范围中的最大额定值为例进行说明。通过实时检测背光源中6个灯串L1～L6分别对应的亮度的数值，可以得到6个电流值：Lm 1、Lm 2、Lm 3、Lm 4、Lm 5、Lm 6，这6个亮度值的平均值
Figure PCTCN2018092788-appb-000011
即为
Figure PCTCN2018092788-appb-000012
在
Figure PCTCN2018092788-appb-000013
时，增加输入这6个灯串L1～L6的电压值V0，在将增加后的电压值V0输入到这6个灯串L1～L6中时，可以使流过这6个灯串L1～L6的电流值I 1、I 2、I 3、I 4、I 5、I 6增加，使这6个灯串L1～L6的亮度增加，从而使
Figure PCTCN2018092788-appb-000014
增加，以使
Figure PCTCN2018092788-appb-000015
向满足亮度的预设额定值范围方向进行调节，从而使
Figure PCTCN2018092788-appb-000016
满足亮度的预设额定值范围，进而实现调节背光源亮度，以使背光源亮度稳定的效果。在
Figure PCTCN2018092788-appb-000017
时，减小输入这6个灯串L1～L6的电压值 V0，在将减小后的电压值V0输入到这6个灯串L1～L6中时，可以使流过这6个灯串L1～L6的电流值I 1、I 2、I 3、I 4、I 5、I 6减小，使这6个灯串L1～L6的亮度减小，从而使
Figure PCTCN2018092788-appb-000018
减小，以使
Figure PCTCN2018092788-appb-000019
向满足亮度的预设额定值范围方向进行调节，从而使
Figure PCTCN2018092788-appb-000020
满足亮度的预设额定值范围，进而实现调节背光源亮度，以使背光源亮度稳定的效果。
下面通过实施例对上述参数为电流或亮度时，增加或减小输入各灯串的电压值的过程进行说明。
在一些实施例中，参数为电流，所述增加输入所述发光器件的电压值包括：根据所述平均值与所述最小额定电流值之间的电流差值，确定电压控制信号的占空比的第一调整量；将所述电压控制信号的占空比增加所述第一调整量。
在具体实施时，电压控制信号为可以对其脉冲宽度进行调制的PWM(Pulse Width Modulation，脉冲宽度调制)信号，电压控制信号的占空比为其有效脉冲信号在电压控制信号内所占的时间比率。其中，电压控制信号的有效脉冲信号用于控制输出给灯串的电压值的大小，并且电压控制信号的占空比越大，输出给灯串的功率越大。在实际应用中，可以使用通常的用于控制输出给灯串的电压值大小的控制信号作为电压控制信号。
在具体实施时，在本公开实施例提供的调节方法中，预先存储有电流的平均值与最小额定值之间的电流差值和占空比的第一调整量之间的对应关系。该对应关系为：电流的平均值与最小额定值之间的电流差值越大，对应的占空比的第一调整量越大。在实际应用中，预先存储的电流的平均值与最小额定值之间的电流差值和占空比的第一调整量之间的对应关系可以为本领域技术人员根据经验得到的对应关系，且需要根据实际应用环境来设计确定，在此不作赘述。
图3给出了电压控制信号的占空比与流过灯串的电流之间的对应关系的示意图，其中，横坐标代表单位1与占空比d之间的差值，纵坐标代表电流值I。
具体地，根据图3可知，电压控制信号的占空比越大，流过灯串的电流越大。以I 0＝60mA，ΔI＝0.5mA为例，则I min＝59.5mA。当确定出的电流的平均值
Figure PCTCN2018092788-appb-000021
时，此时平均值
Figure PCTCN2018092788-appb-000022
与最小额定值I min之间的 电流差值为9.5mA，根据该电流差值9.5mA可以得到占空比需要调整的第一调整量Δd 1。根据第一调整量Δd 1对电压控制信号的占空比进行调整，以使电压控制信号的占空比增加Δd 1，从而可以使增加Δd 1后的电压控制信号的占空比在误差允许的范围内趋向于I 0对应的电压控制信号的占空比，以使根据调整占空比后的电压控制信号确定出的输入各灯串的电压值增加，进而使流过各灯串的电流增加，以使调节后的流过各灯串的电流的平均值
Figure PCTCN2018092788-appb-000023
在误差允许的范围内趋向于I 0。
需要说明的是，图3仅是给出的一个示例图，其仅是用于示意出一种电压控制信号的占空比与流过灯串的电流之间的对应关系，并不用于限定本公开中预先存储的电流的平均值与最小额定值之间的电流差值和占空比的第一调整量之间的对应关系。
在一些实施例中，参数为电流，所述减小输入所述发光器件的电压值包括：根据所述平均值与所述最大额定电流值之间的电流差值，确定电压控制信号的占空比的第二调整量；将所述电压控制信号的占空比减小所述第二调整量。
在具体实施时，电压控制信号为可以对其脉冲宽度进行调制的PWM信号，电压控制信号的占空比为其有效脉冲信号在电压控制信号内所占的时间比率。其中，电压控制信号的有效脉冲信号用于控制输出给灯串的电压值的大小，并且电压控制信号的占空比越大，输出给灯串的功率越大。在实际应用中，可以使用通常的用于控制输出给灯串的电压值大小的控制信号作为电压控制信号。
在具体实施时，在本公开实施例提供的调节方法中，预先存储有电流的平均值与最大额定值之间的电流差值和占空比的第二调整量之间的对应关系。该对应关系为：电流的平均值与最大额定值之间的电流差值越大，对应的占空比的第二调整量越大。在实际应用中，预先存储的电流的平均值与最大额定值之间的电流差值和占空比的第二调整量之间的对应关系可以为本领域技术人员根据经验得到的对应关系，且需要根据实际应用环境来设计确定，在此不作赘述。
具体地，根据图3可知，电压控制信号的占空比越大，流过灯串的电流越大。以I 0＝60mA，ΔI＝0.5mA为例，则I max＝60.5mA。当确定出的电流的平均值
Figure PCTCN2018092788-appb-000024
时，此时平均值
Figure PCTCN2018092788-appb-000025
与最大额定值I max之间的 电流差值为9.5mA，根据该电流差值9.5mA可以得到占空比需要调整的第二调整量Δd 2。根据第二调整量Δd 2对电压控制信号的占空比进行调整，以使电压控制信号的占空比减小Δd 2，从而可以使减小Δd 2后的电压控制信号的占空比在误差允许的范围内趋向于I 0对应的电压控制信号的占空比，以使根据调整占空比后的电压控制信号确定出的输入各灯串的电压值减小，进而使流过各灯串的电流减小，以使调节后的流过各灯串的电流的平均值
Figure PCTCN2018092788-appb-000026
在误差允许的范围内趋向于I 0。
需要说明的是，图3仅是给出的一个示例图，其仅是用于示意出一种电压控制信号的占空比与流过灯串的电流之间的对应关系，并不用于限定本公开中预先存储的电流的平均值与最大额定值之间的电流差值和占空比的第二调整量之间的对应关系。
在一些实施例中，参数为亮度，所述增加输入所述发光器件的电压值包括：根据所述平均值与所述最小额定亮度值之间的亮度差值，确定电压控制信号的占空比的第三调整量；将所述电压控制信号的占空比增加所述第三调整量。
在具体实施时，电压控制信号为可以对其脉冲宽度进行调制的PWM信号，电压控制信号的占空比为其有效脉冲信号在电压控制信号内所占的时间比率。其中，电压控制信号的有效脉冲信号用于控制输出给灯串的电压值的大小，并且电压控制信号的占空比越大，输出给灯串的功率越大。在实际应用中，可以使用通常的用于控制输出给灯串的电压值大小的控制信号作为电压控制信号。
在具体实施时，在本公开实施例提供的调节方法中，预先存储有亮度的平均值与最小额定值之间的亮度差值和占空比的第三调整量之间的对应关系。该对应关系为：亮度的平均值与最小额定值之间的亮度差值越大，对应的占空比的第三调整量越大。在实际应用中，预先存储的亮度的平均值与最小额定值之间的亮度差值和占空比的第三调整量之间的对应关系可以为本领域技术人员根据经验得到的对应关系，且需要根据实际应用环境来设计确定，在此不作赘述。
具体地，当确定出亮度的平均值
Figure PCTCN2018092788-appb-000027
与亮度的最小额定值Lm min之间的亮度差值时，根据该亮度差值可以得到占空比需要调整的第三调整量Δd 3。根据第三调整量Δd 3对电压控制信号的占空比进行调整，以使 电压控制信号的占空比增加Δd 3，从而可以使增加Δd 3后的电压控制信号的占空比在误差允许的范围内趋向于Lm 0对应的电压控制信号的占空比，以使根据调整占空比后的电压控制信号确定出的输入各灯串的电压值增加，进而使流过各灯串的电流增加，以使调节后的各灯串的亮度的平均值
Figure PCTCN2018092788-appb-000028
在误差允许的范围内趋向于Lm 0。
在一些实施例中，参数为亮度，所述减小输入所述发光器件的电压值包括：根据所述平均值与所述最大额定亮度值之间的亮度差值，确定电压控制信号的占空比的第四调整量；将所述电压控制信号的占空比减小所述第四调整量。
在具体实施时，电压控制信号为可以对其脉冲宽度进行调制的PWM信号，电压控制信号的占空比为其有效脉冲信号在电压控制信号内所占的时间比率。其中，电压控制信号的有效脉冲信号用于控制输出给灯串的电压值的大小，并且电压控制信号的占空比越大，输出给灯串的功率越大。在实际应用中，可以使用通常的用于控制输出给灯串的电压值大小的控制信号作为电压控制信号。
在具体实施时，在本公开实施例提供的调节方法中，预先存储有亮度的平均值与最大额定值之间的亮度差值和占空比的第四调整量之间的对应关系。该对应关系为：亮度的平均值与最大额定值之间的亮度差值越大，对应的占空比的第四调整量越大。在实际应用中，预先存储的亮度的平均值与最大额定值之间的亮度差值和占空比的第四调整量之间的对应关系可以为本领域技术人员根据经验得到的对应关系，需要根据实际应用环境来设计确定，在此不作赘述。
具体地，当确定出亮度的平均值
Figure PCTCN2018092788-appb-000029
与亮度的最大额定值Lm max之间的亮度差值时，根据该亮度差值可以得到占空比需要调整的第四调整量Δd 4。根据第四调整量Δd 4对电压控制信号的占空比进行调整，以使电压控制信号的占空比减小Δd 4，从而可以使减小Δd 4后的电压控制信号的占空比在误差允许的范围内趋向于Lm 0对应的电压控制信号的占空比，以使根据调整占空比后的电压控制信号确定出的输入各灯串的电压值减小，进而使流过各灯串的电流减小，以使调节后的各灯串的亮度的平均值
Figure PCTCN2018092788-appb-000030
在误差允许的范围内趋向于Lm 0。
基于同一构思，本公开实施例还提供了一种调节背光源的装置， 如图4所示，包括：检测单元10，配置为获取背光源中发光器件(L1～LN)的参数的数值；确定单元20，配置为根据获取的数值确定平均值；以及控制单元30，用配置为当所述平均值在预设参数范围之外时，调整输入所述发光器件的电压值。
本公开实施例提供的调节背光源的装置，可以将参数设置为背光源具有的多个可被检测的物理量中的一个，其中物理量例如可以为流过发光器件的电流、发光器件的亮度等。根据实时检测到的参数的数值得到该参数的平均值，当所述平均值在预设参数范围之外时，调整输入所述发光器件的电压值，以调整流过所述发光器件的电流，从而调节背光源的亮度。由此，可以采用不同的方式调节背光源的亮度，以使背光源的亮度可以在不同环境下稳定的发光。
在具体实施时，在本公开实施例提供的装置中，以流过LED的电流作为参数，即参数为电流。预设电流范围可以为I 0±ΔI组成的范围，其中，I 0代表背光源中所有灯串的额定电流值的平均值，ΔI代表在误差允许范围内I 0可以偏离的数值。在实际应用中，I 0和ΔI的具体数值需要根据实际应用环境来确定，在此不作限定。
在具体实施时，在本公开实施例提供的装置中，参数为电流，控制单元配置为：在所述平均值小于预设电流范围中的最小额定电流值时，增加输入所述发光器件的电压值；在所述平均值大于所述预设电流范围中的最大额定电流值时，减小输入所述发光器件的电压值。
在一些实施例中，所述控制单元配置为：在所述平均值小于预设电流范围中的最小额定电流值时，根据所述平均值与所述最小额定电流值之间的电流差值，确定电压控制信号的占空比的第一调整量；以及将所述电压控制信号的占空比增加所述第一调整量。并且在具体实施时，在本公开实施例提供的装置中，预先存储有电流的平均值与最小额定值之间的电流差值和占空比的第一调整量之间的对应关系。该对应关系为：电流的平均值与最小额定值之间的电流差值越大，对应的占空比的第一调整量越大。在实际应用中，预先存储的电流的平均值与最小额定值之间的电流差值和占空比的第一调整量之间的对应关系可以为本领域技术人员根据经验得到的对应关系，且需要根据实际应用环境来设计确定，在此不作赘述。
在一些实施例中，在所述平均值大于所述预设电流范围中的最大 额定电流值时，根据所述平均值与所述最大额定电流值之间的电流差值，确定电压控制信号的占空比的第二调整量；以及将所述电压控制信号的占空比减小所述第二调整量。并且在具体实施时，在本公开实施例提供的装置中，预先存储有电流的平均值与最大额定值之间的电流差值和占空比的第二调整量之间的对应关系。该对应关系为：电流的平均值与最大额定值之间的电流差值越大，对应的占空比的第二调整量越大。在实际应用中，预先存储的电流的平均值与最大额定值之间的电流差值和占空比的第二调整量之间的对应关系可以为本领域技术人员根据经验得到的对应关系，且需要根据实际应用环境来设计确定，在此不作赘述。
在参数为电流时，在本公开实施例提供的装置中，如图5所示，可选地，所述发光器件包括至少一个灯串(L1～LN)；所述检测单元10包括至少一个电流检测器(LB1～LBN)，所述至少一个电流检测器与所述至少一个灯串一一对应地连接。具体地，各电流检测器可以用于实时检测与其连接的灯串的电流的数值，并将检测到的电流的数值传输给确定单元20。在具体实施时，可以使用常规的电流检测器作为本公开实施例中的电流检测器，在此不作赘述。
在具体实施时，在本公开实施例提供的装置中，以LED发光的亮度作为参数，即参数为亮度。亮度对应的预设额定值范围可以为Lm 0±ΔLm组成的范围，其中，Lm 0代表背光源中所有灯串的额定亮度值的平均值，ΔLm代表在误差允许范围内Lm 0可以偏离的数值。在实际应用中，Lm 0和ΔLm的具体数值需要根据实际应用环境来确定，在此不作限定。
在具体实施时，在本公开实施例提供的装置中，所述参数为亮度；所述控制单元配置为：在所述平均值小于预设亮度范围中的最小额定亮度值时，增加输入所述发光器件的电压值；在所述平均值大于所述预设亮度范围中的最大额定亮度值时，减小输入所述发光器件的电压值。
在一些实施例中，所述控制单元配置为：在所述平均值小于预设亮度范围中的最小额定亮度值时，根据所述平均值与所述最小额定亮度值之间的亮度差值，确定电压控制信号的占空比的第三调整量；以及将所述电压控制信号的占空比增加所述第三调整量。并且在具体实 施时，在本公开实施例提供的装置中，预先存储有亮度的平均值与最小额定值之间的亮度差值和占空比的第三调整量之间的对应关系。该对应关系为：亮度的平均值与最小额定值之间的亮度差值越大，对应的占空比的第三调整量越大。在实际应用中，预先存储的亮度的平均值与最小额定值之间的亮度差值和占空比的第三调整量之间的对应关系可以为本领域技术人员根据经验得到的对应关系，且需要根据实际应用环境来设计确定，在此不作赘述。
在一些实施例中，所述控制单元配置为：在所述平均值大于所述预设亮度范围中的最大额定亮度值时，根据所述平均值与所述最大额定亮度值之间的亮度差值，确定电压控制信号的占空比的第四调整量；以及将所述电压控制信号的占空比减小所述第四调整量。并且在具体实施时，在本公开实施例提供的装置中，预先存储有亮度的平均值与最大额定值之间的亮度差值和占空比的第四调整量之间的对应关系。该对应关系为：亮度的平均值与最大额定值之间的亮度差值越大，对应的占空比的第四调整量越大。在实际应用中，预先存储的亮度的平均值与最大额定值之间的亮度差值和占空比的第四调整量之间的对应关系可以为本领域技术人员根据经验得到的对应关系，且需要根据实际应用环境来设计确定，在此不作赘述。
在一些实施例中，如图5所示，所述发光器件包括至少一个灯串(L1～LN)；所述检测单元10包括光线传感器LS，所述光线传感器LS配置为检测所述至少一个灯串(L1～LN)的亮度，并将检测到的亮度的数值传输给确定单元20。在具体实施时，可以使用常规的光线传感器作为本公开实施例中的光线传感器，在此不作赘述。
在本公开的上下文中，实施例中的各个“单元”和“模块”可以由计算机或者计算机与适当传感器的结合来实现，各个单元、模块的处理过程均可以例如由所述计算机中的处理器来实现。
在具体实施时，在本公开实施例提供的装置中，确定单元20可以包括由软件与硬件相结合形成的第一处理器。该第一处理器用于根据检测到的参数的各数值确定参数的平均值。在实际应用中，本领域技术人员可以理解，该第一处理器的具体结构需要根据实际应用环境来设计确定，在此不作限定。
在具体实施时，在本公开实施例提供的装置中，控制单元30可以 包括由软件与硬件相结合形成的第二处理器。该第二处理器用于在判断参数的平均值不满足参数的预设额定值范围时，调整输入各灯串的电压值。在实际应用中，本领域技术人员可以理解，该第二处理器的具体结构需要根据实际应用环境来设计确定，在此不作限定。
本公开实施例提供的调节背光源的方法及装置，可以将参数设置为背光源具有的多个可被检测的物理量中的一个，其中物理量例如可以为流过发光器件的电流、发光器件的亮度等。根据实时检测到的参数的数值得到该参数的平均值，当所述平均值在预设参数范围之外时，调整输入所述发光器件的电压值，以调整流过所述发光器件的电流，从而调节背光源的亮度。由此，可以采用不同的方式调节背光源的亮度，以使背光源的亮度可以在不同环境下稳定的发光。
显然，本领域的技术人员可以对本公开进行各种改动和变型而不脱离本公开的精神和范围。这样，倘若本公开的这些修改和变型属于本公开权利要求及其等同技术的范围之内，则本公开也意图包含这些改动和变型在内。

Claims (17)

  1. 一种调节背光源的方法，包括：
    获取背光源中发光器件的参数的数值；
    根据获取的数值确定平均值；以及
    当所述平均值在预设参数范围之外时，调整输入所述发光器件的电压值。
  2. 如权利要求1所述的方法，其中，所述发光器件包括至少一个灯串。
  3. 如权利要求1或2所述的方法，其中，所述参数为电流；所述调整输入所述发光器件的电压值包括：
    在所述平均值小于预设电流范围中的最小额定电流值时，增加输入所述发光器件的电压值；
    在所述平均值大于所述预设电流范围中的最大额定电流值时，减小输入所述发光器件的电压值。
  4. 如权利要求3所述的方法，其中，所述增加输入所述发光器件的电压值包括：
    根据所述平均值与所述最小额定电流值之间的电流差值，确定电压控制信号的占空比的第一调整量；
    将所述电压控制信号的占空比增加所述第一调整量。
  5. 如权利要求3所述的方法，其中，所述减小输入所述发光器件的电压值包括：
    根据所述平均值与所述最大额定电流值之间的电流差值，确定电压控制信号的占空比的第二调整量；
    将所述电压控制信号的占空比减小所述第二调整量。
  6. 如权利要求1或2所述的方法，其中，所述参数为亮度；所述调整输入所述发光器件的电压值包括：
    在所述平均值小于预设亮度范围中的最小额定亮度值时，增加输入所述发光器件的电压值；
    在所述平均值大于所述预设亮度范围中的最大额定亮度值时，减小输入所述发光器件的电压值。
  7. 如权利要求6所述的方法，其中，所述增加输入所述发光器件的电压值包括：
    根据所述平均值与所述最小额定亮度值之间的亮度差值，确定电压控制信号的占空比的第三调整量；
    将所述电压控制信号的占空比增加所述第三调整量。
  8. 如权利要求6所述的方法，其中，所述减小输入所述发光器件的电压值包括：
    根据所述平均值与所述最大额定亮度值之间的亮度差值，确定电压控制信号的占空比的第四调整量；
    将所述电压控制信号的占空比减小所述第四调整量。
  9. 一种调节背光源的装置，包括：
    检测单元，配置为获取背光源中发光器件的参数的数值；
    确定单元，配置为根据获取的数值确定平均值；以及
    控制单元，配置为当所述平均值在预设参数范围之外时，调整输入所述发光器件的电压值。
  10. 如权利要求9所述的装置，其中，所述参数为电流；所述控制单元配置为：在所述平均值小于预设电流范围中的最小额定电流值时，增加输入所述发光器件的电压值；在所述平均值大于所述预设电流范围中的最大额定电流值时，减小输入所述发光器件的电压值。
  11. 如权利要求10所述的装置，其中，所述控制单元配置为：在所述平均值小于预设电流范围中的最小额定电流值时，根据所述平均值与所述最小额定电流值之间的电流差值，确定电压控制信号的占空比的第一调整量；以及将所述电压控制信号的占空比增加所述第一调整量。
  12. 如权利要求10所述的装置，其中，所述控制单元配置为：在所述平均值大于所述预设电流范围中的最大额定电流值时，根据所述平均值与所述最大额定电流值之间的电流差值，确定电压控制信号的占空比的第二调整量；以及将所述电压控制信号的占空比减小所述第二调整量。
  13. 如权利要求10-12任一项所述的装置，其中，所述发光器件包括至少一个灯串；所述检测单元包括至少一个电流检测器，所述至少一个电流检测器与所述至少一个灯串一一对应地连接。
  14. 如权利要求9所述的装置，其中，所述参数为亮度；所述控制单元配置为：在所述平均值小于预设亮度范围中的最小额定亮度值时，增加输入所述发光器件的电压值；在所述平均值大于所述预设亮度范围中的最大额定亮度值时，减小输入所述发光器件的电压值。
  15. 如权利要求14所述的装置，其中，所述控制单元配置为：在所述平均值小于预设亮度范围中的最小额定亮度值时，根据所述平均值与所述最小额定亮度值之间的亮度差值，确定电压控制信号的占空比的第三调整量；以及将所述电压控制信号的占空比增加所述第三调整量。
  16. 如权利要求14所述的装置，其中，所述控制单元配置为：在所述平均值大于所述预设亮度范围中的最大额定亮度值时，根据所述平均值与所述最大额定亮度值之间的亮度差值，确定电压控制信号的占空比的第四调整量；以及将所述电压控制信号的占空比减小所述第四调整量。
  17. 如权利要求14-16任一项所述的装置，其中，所述发光器件包括至少一个灯串；所述检测单元包括光线传感器，所述光线传感器配置为检测所述至少一个灯串的亮度。
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