WO2012136018A1 - 一种降低显示设备背光功耗的方法及装置 - Google Patents

一种降低显示设备背光功耗的方法及装置 Download PDF

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Publication number
WO2012136018A1
WO2012136018A1 PCT/CN2011/075968 CN2011075968W WO2012136018A1 WO 2012136018 A1 WO2012136018 A1 WO 2012136018A1 CN 2011075968 W CN2011075968 W CN 2011075968W WO 2012136018 A1 WO2012136018 A1 WO 2012136018A1
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Prior art keywords
backlight
display device
pwm wave
content
duty ratio
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PCT/CN2011/075968
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English (en)
French (fr)
Inventor
喻俊峰
赵斌
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中兴通讯股份有限公司
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Publication of WO2012136018A1 publication Critical patent/WO2012136018A1/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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/064—Adjustment of display parameters for control of overall brightness by time 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G09G2330/022—Power management, e.g. power saving in absence of operation, e.g. no data being entered during a predetermined time

Definitions

  • the invention relates to the field of communication technologies, and in particular, to a method and device for reducing power consumption of a backlight of a display device. Background technique
  • the control of the backlight of most display devices is commonly used, such as mobile phones
  • the backlight control of the LCD on the mobile phone is generally used in the form of direct current supply, or the common supply mode of the 5V power supply to the parallel, or It is a common supply method of connecting the voltage to 20V through the booster chip, that is, regardless of the brightness of the pre-displayed picture on the display device display screen, the backlight of the display device is stable and often supplied, which wastes Displays the backlight power consumption of the device.
  • the present invention provides a method and apparatus for reducing the power consumption of a backlight of a display device, and solves the technical problem that the backlight power consumption of the display device is wasted in a manner in which the backlight is stably supplied in the prior art.
  • the present invention uses the following technical solutions:
  • a method for reducing backlight power consumption of a display device comprising: Adjusting the brightness of the pre-displayed content of the display device to output a PWM (Pulse Width Modulation) wave having a corresponding duty ratio;
  • PWM Pulse Width Modulation
  • the on/off of the backlight of the display device is controlled according to the PWM wave having the corresponding duty ratio.
  • the step of adjusting the gray scale brightness of the display device to display the gray level of the content to output the PWM wave having the corresponding duty ratio is specifically: setting a content analyzer circuit, the content analyzer circuit adjusting the gray scale of the display device pre-display content Brightness to output a PWM wave with a corresponding duty cycle.
  • the content analyzer circuit adjusts the grayscale brightness of the display device to display the grayscale brightness of the content to output the PWM wave having the corresponding duty ratio, specifically: the content analyzer circuit adjusts the grayscale brightness of the predisplayed content of the display device, according to The adjustment result determines the reduction of the backlight power consumption, and controls the output of the PWM wave having the corresponding duty ratio according to the reduction amplitude of the backlight power consumption.
  • the step of controlling the backlight of the display device according to the PWM wave having the corresponding duty ratio is specifically: setting a backlight control circuit, and when the PWM wave is at a high level, the backlight control circuit controls the backlight of the display device The source is turned on, and when the PWM wave is at a low level, the backlight control circuit controls the display device backlight to be turned off.
  • An apparatus for reducing power consumption of a backlight of a display device comprising: a content analyzer circuit and a backlight control circuit, wherein the content analyzer circuit is configured to adjust a grayscale brightness of the pre-displayed content of the display device, and according to the adjusted pre- a gray scale brightness of the display content outputs a PWM wave having a corresponding duty ratio to the backlight control circuit; the backlight control circuit is configured to control a backlight of the display device according to the PWM wave having a corresponding duty ratio Broken.
  • the backlight control circuit controls the display device backlight to be turned on when the PWM wave is at a high level, and controls the display device backlight to be turned off when the PWM wave is at a low level.
  • the backlight control circuit comprises: an N+P dual MOS transistor and a pull-up resistor, the PWM wave input terminal is connected to the gate of the N-channel MOS, the source of the N-channel MOS is grounded, the drain and the P The gate of the channel MOS is connected and connected to the power supply through a pull-up resistor.
  • the drain of the P-channel MOS is connected to the backlight, and the source is connected to the power source.
  • the N-channel MOS transistor When the PWM wave is at a high level, the N-channel MOS transistor is in an on state, the P-channel MOS transistor is turned on, the backlight is in an on state; when the PWM wave is at a low level, The N-channel MOS transistor is in an off state, the P-channel MOS transistor is turned off, and the backlight is in an off state.
  • the N+P dual MOS transistor is an enhanced MOS transistor.
  • the pull-up resistor is 10K ohms.
  • the present invention provides a method and apparatus for reducing backlight power consumption of a display device, by adjusting a gray scale brightness of a display device pre-displayed content, to output a PWM wave having a corresponding duty ratio, according to the PWM wave having a corresponding duty ratio Controlling the on/off of the backlight of the display device; the invention controls the gray-scale brightness of the pre-displayed content of the display device to control the intermittent on-off of the backlight, and solves the problem that the backlight of the prior art is stably supplied by the backlight in the prior art.
  • the technical problem of wasting waste, and at the same time, the adjustment of the gray scale brightness of the pre-displayed content causes the display device to finally display a small distortion.
  • FIG. 1 is a schematic flowchart of a method for reducing backlight power consumption of a display device according to an embodiment of the present invention
  • FIG. 2 is a circuit diagram of a backlight control circuit for reducing backlight power consumption of a display device according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of waveforms of voltages of backlight control circuits A, B, and C according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a device for reducing backlight power consumption of a display device according to an embodiment of the present invention. detailed description
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • FIG. 1 is a schematic flowchart of a method for reducing backlight power consumption of a display device according to an embodiment of the present invention, please refer to FIG. 1 :
  • the PWM wave with the corresponding duty ratio outputted according to the step SOI controls the on and off of the backlight of the display device.
  • a CABC Content Adaptive Brightness Control
  • the mobile phone processor transmits a pre-display picture.
  • the data is sent to the driver IC, and the content analyzer circuit calculates and counts the data of the picture and automatically adjusts the grayscale brightness according to the set algorithm, and accordingly determines the reduction of the backlight power consumption, that is, the backlight power saving range, such as content analysis.
  • the circuit increases the grayscale brightness of the pre-displayed picture by 30%. At this time, the picture becomes brighter and a new picture data is obtained.
  • the backlight brightness is reduced by 30% accordingly, and the PWM signal is dynamically adjusted according to the value, and the output is controlled.
  • the PWM wave having the corresponding duty ratio inputs the PWM wave having the corresponding duty ratio to a backlight control circuit, and the backlight control circuit controls the on and off of the backlight according to the PWM wave. Since the grayscale brightness of the picture has been adjusted by the content analyzer circuit in advance, the user can get the display effect that is similar to the original picture, but reduce the backlight power consumption by 30%, minimize the distortion of the display picture, and reduce the backlight current. Consumption.
  • FIG. 2 is a circuit diagram of a backlight control circuit in a device for reducing backlight power consumption of a display device according to an embodiment of the present invention. Please refer to FIG. 2:
  • the backlight control circuit mainly comprises an N+P dual MOS transistor and a pull-up resistor R.
  • the PWM wave outputted by the content analyzer circuit is connected to the gate of the N-channel MOS transistor, and the source of the N-channel MOS transistor is grounded.
  • the drain is connected to the gate of the P-channel MOS transistor and connected to the power supply through a pull-up resistor.
  • the drain of the P-channel MOS is connected to the backlight, and the source is connected to the power source; the backlight power of the mobile phone is usually 5V,
  • the pull-up resistor R acts as a voltage pull-up
  • the N+P dual MOS transistor is preferably an enhancement type MOS transistor
  • the PWM wave output from the LCD IC is 2V high, the ⁇ level is 0, and the PWM wave output from the LCD IC is high.
  • the N-channel MOS transistor When the N-channel MOS transistor is in the on state, the voltage at B is 0, the P-channel MOS transistor is turned on, and the voltage at C is high; when the PWM wave output from the LCD IC is low, the N-channel The MOS transistor is in the off state, the voltage at B is 5V, the P-channel MOS transistor is turned off, and C is at a low level.
  • the PWM wave outputted by the content analyzer circuit in the LCD IC can control the intermittent supply of the 5V backlight, thereby achieving the purpose of reducing power consumption.
  • FIG. 3 is a waveform diagram of three voltages of the backlight control circuits A, B, and C according to an embodiment of the present invention. Please refer to FIG. 3:
  • the waveform at A is a waveform output by the LCD driver IC, and the high level is 2V, low level.
  • the waveform at B is the waveform after the first N-channel MOS transistor, the high level is 5V, and the low level is 0V;
  • the waveform at C is the waveform directly supplying power to the LCD backlight, the high level is 5V, where C is the anode of the diode, the diode has a 2V voltage drop, so the low level at C is 2V, so the effect of power saving is based on the duty cycle of 2V and 5V output at C.
  • the duty ratio of the P+N dual MOS transistor output to the LCD backlight is related to the product of the pull-up resistor R and the input capacitance C iss of the P-channel MOS transistor, and is also related to the delay.
  • the main parameter to be selected for the P+N double MOS transistor is the input capacitance C iss of the P-channel MOS transistor. The smaller the value, the better.
  • the product of R and C is ⁇ can be reduced by reducing R, but a new problem arises by subtracting d and R, that is, when the N-channel MOS transistor is turned on,
  • the current flowing through R becomes larger, although the current supplied to the backlight is lowered, but the overall current is increased, so it is necessary to find a balance point, and the pull-up resistor of this embodiment is preferably 10K ohm.
  • the embodiment further includes a device for reducing the backlight power consumption of the display device.
  • FIG. 4 is a schematic structural diagram of a device for reducing the backlight power consumption of the display device according to an embodiment of the present invention. Please refer to FIG. 4: the device includes a content analyzer circuit 1 And a backlight control circuit 2, the content analyzer circuit 1 is set to tune The display device displays the grayscale brightness of the content of the pre-displayed content, and outputs a PWM wave having a corresponding duty ratio to the backlight control circuit 2 according to the grayscale brightness of the adjusted pre-display content; the backlight control circuit 2 is set according to the corresponding The PWM signal of the duty cycle controls the on and off of the backlight of the device.
  • the backlight control circuit 2 controls the backlight to be turned on when the PWM wave output from the content analyzer circuit 1 is at a high level; and controls the backlight to be turned off when the PWM wave output from the content analyzer circuit 1 is at a low level.
  • the backlight control circuit 2 includes an N+P dual MOS transistor and a pull-up resistor. When the PWM wave outputted by the content analyzer circuit 1 is at a high level, the N-channel MOS transistor is in an on state, and the P-channel MOS transistor is turned on.
  • the backlight is in an on state; when the PWM wave outputted by the content analyzer circuit 1 is at a low level, the N-channel MOS transistor is in an off state, the P-channel MOS transistor is turned off, and the backlight is in an off state.
  • the content analyzer circuit in the IC statistically analyzes the data of the content to be displayed, obtains a Histogram, and recalculates the compensation according to the statistical graph of each image and the CABC-related settings to obtain a new content.
  • Data and synchronously determine the backlight power saving amplitude, and then output a PWM wave having a corresponding duty ratio according to the value, and input the PWM wave to a backlight control circuit to control the on/off of the backlight to minimize distortion of the display image. Reduce the consumption of backlight current.

Description

一种降低显示设备背光功耗的方法及装置 技术领域
本发明通信技术领域， 尤其涉及一种降低显示设备背光功耗的方法及 装置。 背景技术
随着电子技术的发展， 被广泛应用的移动终端、 电视、 MID (移动互 联网设备）等电子设备的功能越来越多样化， 如手机， 目前的手机集通话、 短信、摄像、 音乐播放、 蓝牙、 GPS、 游戏、 网页浏览功能、 收发电子邮件、 曰程管理、 网上购物、 下载各种丰富软件等功能于一体。 电子设备的功能 越来越丰富， 一方面满足了用户的应用需求， 另一方面也增加了显示设备 的背光功耗。
目前， 大多数显示设备背光源的控制都是釆用常供的方式， 比如手机， 手机上 LCD的背光源控制普遍釆用直流常供的方式， 或者是 5V电源给并 联的常供方式， 或者是通过升压芯片将电压升至 20V给串联的常供方式， 也就是说， 不论显示设备显示屏上预显示图片的亮暗程度， 显示设备的背 光源都是稳定常供的， 这样浪费了显示设备的背光功耗。 发明内容
有鉴于此， 本发明提供一种降低显示设备背光功耗的方法及装置， 解 决现有技术中背光源稳定常供的方式造成显示设备背光功耗浪费的技术问 题。
为解决上述技术问题， 本发明釆用以下技术方案：
一种降低显示设备背光功耗的方法， 包括： 调节显示设备预显示内容的及阶亮度， 以输出具有相应占空比的 PWM (脉冲宽度调制） 波；
根据所述具有相应占空比的 PWM波控制显示设备背光源的通断。 所述调节显示设备预显示内容的灰阶亮度， 以输出具有相应占空比的 PWM波的步骤具体为： 设置一内容分析器电路， 所述内容分析器电路调节 显示设备预显示内容的灰阶亮度， 以输出具有相应占空比的 PWM波。
所述内容分析器电路调节显示设备预显示内容的灰阶亮度， 以输出具 有相应占空比的 PWM波的步骤具体为：所述内容分析器电路调节显示设备 预显示内容的灰阶亮度， 根据调节结果确定背光功耗的降低幅度， 根据所 述背光功耗的降低幅度控制输出具有相应占空比的 PWM波。
所述根据具有相应占空比的 PWM 波控制显示设备背光源通断的步骤 具体为： 设置一背光源控制电路， 当所述 PWM波在高电平时， 所述背光源 控制电路控制显示设备背光源接通， 当所述 PWM波在低电平时，所述背光 源控制电路控制显示设备背光源断开。
一种降低显示设备背光功耗的装置， 包括一内容分析器电路和一背光 源控制电路， 所述内容分析器电路， 设置为调节显示设备预显示内容的灰 阶亮度， 并根据调节后的预显示内容的灰阶亮度向所述背光源控制电路输 出具有相应占空比的 PWM波； 所述背光源控制电路，设置为根据所述具有 相应占空比的 PWM波控制显示设备背光源的通断。
所述背光源控制电路：在所述 PWM波为高电平时，控制显示设备背光 源接通； 在所述 PWM波为低电平时， 控制显示设备背光源断开。
所述背光源控制电路包括： N+P双 MOS管和上拉电阻， 所述 PWM波 输入端接至 N沟道 MOS的栅极， 所述 N沟道 MOS的源极接地， 漏极与 P 沟道 MOS的栅极相连， 并通过一上拉电阻连接至电源， 所述 P沟道 MOS 的漏极接背光源， 源极接至所述电源。 在所述 PWM波为高电平时， 所迷 N 道 MOS管处于导通状态 , 所述 P沟道 MOS管导通， 所述背光源处于接通状态； 在所述 PWM波为低电平 时， 所述 N沟道 MOS管处于断开状态， 所述 P沟道 MOS管截止， 所述背 光源处于断开状态。
所述 N+P双 MOS管为增强型 MOS管。
所述上拉电阻为 10K欧姆。
本发明提供一种降低显示设备背光功耗的方法及装置， 通过调节显示 设备预显示内容的灰阶亮度， 以输出具有相应占空比的 PWM波，根据所述 具有相应占空比的 PWM波控制显示设备背光源的通断；本发明通过调节显 示设备预显示内容的灰阶亮度， 控制背光源的间隔性通断， 解决了现有技 术中背光源稳定常供的方式造成显示设备背光功耗浪费的技术问题， 同时， 因对预显示内容的灰阶亮度的调节， 使得显示设备最终显示的画面失真小。 附图说明
图 1为本发明实施例一种降低显示设备背光功耗方法的流程示意图； 图 2为本发明实施例一种降低显示设备背光功耗装置中背光源控制电 路的电路图；
图 3为本发明实施例背光源控制电路 A、 B、 C三处电压的波形示意图； 图 4为本发明实施例一种降低显示设备背光功耗装置的结构示意图。 具体实施方式
下面通过具体实施方式结合附图对本发明作进一步详细说明。
实施例一：
图 1 为本发明实施例一种降低显示设备背光功耗方法的流程示意图， 请参考图 1 :
S01、 调节显示设备预显示内容的灰阶亮度， 以输出具有相应占空比的 PWM波；
S02、 根据步骤 SOI输出的具有相应占空比的 PWM波控制显示设备背 光源的通断。
下面以手机上 LCD的背光源为例， 对本实施例作进一步详细说明。 本实施例可以釆用 CABC ( Content Adaptive Brightness Control,根据图 片内容进行自适应的亮度调节）技术， 在 LCD驱动 IC (集成电路） 内设置 一个内容分析器电路， 手机处理器传送一张预显示图片的数据到驱动 IC, 内容分析器电路计算并统计图片的数据后依据设定的算法自动的调节其灰 阶亮度， 相应地确定背光功耗的降低幅度， 也就是背光省电幅度， 比如内 容分析器电路将预显示图片的灰阶亮度提高了 30%, 此时图片变亮， 得到 一个新的图片数据， 那么， 相应地确定背光亮度降低 30%, 再依据此数值 动态调节 PWM信号，控制输出具有相应占空比的 PWM波，将该具有相应 占空比的 PWM波输入至一背光源控制电路， 背光源控制电路根据该 PWM 波控制背光源的通断。 由于事先已经通过内容分析器电路调整过图片的灰 阶亮度， 因此用户可以得到与原先图片相差无几的显示效果， 但却减少了 30%的背光功耗， 使显示画面失真最小却可减少背光电流的消耗。
图 2为本发明实施例一种降低显示设备背光功耗装置中背光源控制电 路的电路图， 请参考图 2:
背光源控制电路主要包含一个 N+P双 MOS管和一个上拉电阻 R, 内容分 析器电路输出的 PWM波接至 N沟道 MOS管的栅极， 该 N沟道 MOS管的源极 接地， 漏极与 P沟道 MOS管的栅极相连， 并通过一上拉电阻连接至电源， 该 P沟道 MOS的漏极接背光源， 源极接至该电源； 手机背光电源通常为 5V, 上拉电阻 R起到电压上拉的作用， N+P双 MOS管优选的为增强型 MOS管， N 沟道 MOS管的开启电压 VGS= IV, P沟道 MOS管的开启电压 VGS= -1V。 LCD IC输出的 PWM波高电平为 2V, 氐电平为 0, LCD IC输出的 PWM波为高电平 时， N沟道 MOS管处于导通状态， B处的电压为 0, P沟道 MOS管导通， C处 的电压为高电平； LCD IC输出的 PWM波为低电平时， N沟道 MOS管处于断 开状态， B处的电压为 5V, P沟道 MOS管截止， C处为低电平。 通过该背光 源控制电路， LCD IC内的内容分析器电路输出的 PWM波就可以控制 5V背光 的间断性供给， 从而达到降低功耗的目的。
图 3为本发明实施例背光源控制电路 A、 B、 C三处电压的波形示意图， 请参考图 3: A处的波形是由 LCD 驱动 IC输出的波形， 高电平为 2V, 低 电平为 0V; B处的波形是过第一个 N沟道 MOS管之后的波形， 高电平为 5V, 低电平为 0V; C处的波形是直接给 LCD背光供电的波形， 高电平为 5V, 图中 C处为二极管的正极， 二极管有一个 2V的压降， 因此 C处低电 平为 2V, 因此， 节电的效果是才艮据 C处输出的 2V和 5V电压的占空比来 控制的， C处输出电压的正占空比越小， 即 5V供电的时间越小， 那么节电 效率就越高， C处输出电压的正占空比越大， 即 5V供电的时间越大， 那么 节电效率就越低。
P+N双 MOS管输出给 LCD背光的占空比跟上拉电阻 R和 P沟道 MOS 管的输入电容 Ciss的乘积有关， 也即时延有关， R和 Ciss的乘积越小， 输出 的占空比越小， 平均电流就越小， 节电效率就越高， 选用 P+N双 MOS管 主要关注的参数为 P沟道 MOS管的输入电容 Ciss, 该值越小越好， 当 P沟 道 MOS管的输入电容无法改变时，可以通过减小 R来减小 R和 Cis 々乘积， 但减 d、 R也会出现新的问题， 即当 N沟道 MOS管导通时， 流过 R的电流 就变大， 虽然给背光供电的电流会降低， 但总体的电流会增大， 因此需要 找到一个平衡点 , 本实施例上拉电阻优选的为 10K欧姆。
本实施例还包括一种降低显示设备背光功耗的装置， 图 4为本发明实 施例一种降低显示设备背光功耗装置的结构示意图，请参考图 4: 该装置包 括一内容分析器电路 1和一背光源控制电路 2,内容分析器电路 1设置为调 节显示设备预显示内容的灰阶亮度， 升很据调节后的预显示内容的灰阶亮 度向背光源控制电路 2输出具有相应占空比的 PWM波； 背光源控制电路 2 设置为根据该具有相应占空比的 PWM波控制显示设备背光源的通断。
背光源控制电路 2具体在内容分析器电路 1输出的 PWM波为高电平 时，控制背光源接通； 在内容分析器电路 1输出的 PWM波为低电平时，控 制背光源断开。 背光源控制电路 2包括 N+P双 MOS管和上拉电阻， 当内 容分析器电路 1输出的 PWM波在高电平时， N沟道 MOS管处于导通状态， P沟道 MOS管导通，背光源处于接通状态；当内容分析器电路 1输出的 PWM 波在低电平时， N沟道 MOS管处于断开状态， P沟道 MOS管截止， 背光 源处于断开状态。
本实施例通过 IC内的内容分析器电路统计分析欲显示内容的数据， 取 得灰阶分布图 （Histogram ), 根据每个影像的统计图以及 CABC相关的设 定重新计算补偿之后得到一个新的内容数据， 并同步决定背光省电幅度， 再依此数值输出具有相应占空比的 PWM波，将该 PWM波输入至一背光源 控制电路， 控制背光源的通断， 使显示画面失真最小却可减少背光电流的 消耗。
以上内容是结合具体的实施方式对本发明所作的进一步详细说明， 不 能认定本发明的具体实施只局限于这些说明。 对于本发明所属技术领域的 普通技术人员来说， 在不脱离本发明构思的前提下， 还可以做出若干简单 推演或替换， 都应当视为属于本发明的保护范围。

Claims

权利要求书
1、 一种降低显示设备背光功耗的方法， 包括：
调节显示设备预显示内容的灰阶亮度， 以输出具有相应占空比的脉冲 宽度调制 （PWM ) 波；
根据所述具有相应占空比的 PWM波控制显示设备背光源的通断。
2、 如权利要求 1所述的方法， 其中， 所述调节显示设备预显示内容的 灰阶亮度， 以输出具有相应占空比的 PWM波的步骤具体为：设置一内容分 析器电路， 所述内容分析器电路调节显示设备预显示内容的灰阶亮度， 以 输出具有相应占空比的 PWM波。
3、 如权利要求 2所述的方法， 其中， 所述内容分析器电路调节显示设 备预显示内容的灰阶亮度， 以输出具有相应占空比的 PWM 波的步骤具体 为： 所述内容分析器电路调节显示设备预显示内容的灰阶亮度， 根据调节 结果确定背光功耗的降低幅度， 根据所述背光功耗的降低幅度控制输出具 有相应占空比的 PWM波。
4、 如权利要求 1至 3任一项所述的方法， 其中， 所述根据具有相应占 空比的 PWM波控制显示设备背光源通断的步骤具体为：设置一背光源控制 电路， 当所述 PWM波在高电平时，所述背光源控制电路控制显示设备背光 源接通， 当所述 PWM波在低电平时，所述背光源控制电路控制显示设备背 光源断开。
5、 一种降低显示设备背光功耗的装置， 包括一内容分析器电路和一背 光源控制电路，
所述内容分析器电路， 设置为调节显示设备预显示内容的灰阶亮度， 并根据调节后的预显示内容的灰阶亮度向所述背光源控制电路输出具有相 应占空比的 PWM波；
所述背光源控制电路,设置为根据所述具有相应占空比的 PWM波控制 显示设备背光源的通断。
6、如权利要求 5所述的装置，其中，所述背光源控制电路：在所述 PWM 波为高电平时，控制显示设备背光源接通； 在所述 PWM波为低电平时， 控 制显示设备背光源断开。
7、 如权利要求 5或 6所述的装置， 其中， 所述背光源控制电路包括： N+P双 MOS管和上拉电阻，所述 PWM波输入端接至 N沟道 MOS的栅极， 所述 N沟道 MOS的源极接地， 漏极与 P沟道 MOS的栅极相连， 并通 过一上拉电阻连接至电源；
所述 P沟道 MOS的漏极接背光源， 源极接至所述电源。
8、 如权利要求 7所述的装置， 其中，
在所述 PWM波为高电平时， 所述 N沟道 MOS管处于导通状态， 所述 P沟道 MOS管导通， 所述背光源处于接通状态；
在所述 PWM波为低电平时， 所述 N沟道 MOS管处于断开状态， 所述 P沟道 MOS管截止， 所述背光源处于断开状态。
9、 如权利要求 7所述的装置， 其中， 所述 N+P双 MOS管为增强型 MOS管。
10、 如权利要求 7所述的装置， 其中， 所述上拉电阻为 10K欧姆。
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109360530A (zh) * 2018-10-30 2019-02-19 武汉华星光电技术有限公司 液晶显示装置及其背光控制方法

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105047152A (zh) * 2015-08-05 2015-11-11 昆山龙腾光电有限公司 显示模组
CN105047144B (zh) * 2015-09-08 2018-01-12 武汉华星光电技术有限公司 液晶显示装置及其背光控制方法
CN105575341A (zh) 2016-03-15 2016-05-11 武汉华星光电技术有限公司 液晶显示装置及其背光控制方法
JP6383391B2 (ja) * 2016-09-12 2018-08-29 シャープ株式会社 制御装置及び当該制御装置を備えた液晶表示装置
CN106775549B (zh) * 2016-12-14 2019-03-26 维沃移动通信有限公司 一种cabc模块控制方法及电子设备
CN107481673B (zh) * 2017-08-14 2019-11-08 上海天马有机发光显示技术有限公司 一种有机发光显示面板及其驱动方法和驱动装置
CN108182916A (zh) * 2018-01-02 2018-06-19 昆山龙腾光电有限公司 驱动电路和驱动方法
CN109166541B (zh) * 2018-09-25 2021-03-02 深圳市爱协生科技有限公司 一种节电且图像不失真的cabc方法
CN111831096B (zh) * 2019-04-18 2022-04-01 Oppo广东移动通信有限公司 图片内容自适应背光控制的设置方法、电子装置及可读存储介质

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101105920A (zh) * 2006-07-10 2008-01-16 Nec液晶技术株式会社 液晶显示装置、该装置中使用的驱动控制电路以及驱动方法
KR20080078210A (ko) * 2007-02-22 2008-08-27 엘지디스플레이 주식회사 영상보상회로와, 이를 포함하는 액정표시장치 및 이의구동방법
CN101414438A (zh) * 2007-10-15 2009-04-22 联咏科技股份有限公司 动态控制背光源的装置以及方法
CN101438622A (zh) * 2006-05-05 2009-05-20 凌力尔特公司 用于对发光二极管之类的负载提供脉冲电流的电路和方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4247269B2 (ja) * 2006-11-21 2009-04-02 株式会社ルネサステクノロジ 表示装置用駆動回路
CN201674212U (zh) * 2010-04-30 2010-12-15 深圳市博源电子有限公司 一种开关电源的过压保护电路及相应开关电源
CN201757975U (zh) * 2010-05-11 2011-03-09 福建捷联电子有限公司 一种液晶显示器单串led灯管推挽式直流高压驱动电路

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101438622A (zh) * 2006-05-05 2009-05-20 凌力尔特公司 用于对发光二极管之类的负载提供脉冲电流的电路和方法
CN101105920A (zh) * 2006-07-10 2008-01-16 Nec液晶技术株式会社 液晶显示装置、该装置中使用的驱动控制电路以及驱动方法
KR20080078210A (ko) * 2007-02-22 2008-08-27 엘지디스플레이 주식회사 영상보상회로와, 이를 포함하는 액정표시장치 및 이의구동방법
CN101414438A (zh) * 2007-10-15 2009-04-22 联咏科技股份有限公司 动态控制背光源的装置以及方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109360530A (zh) * 2018-10-30 2019-02-19 武汉华星光电技术有限公司 液晶显示装置及其背光控制方法
WO2020087870A1 (zh) * 2018-10-30 2020-05-07 武汉华星光电技术有限公司 液晶显示装置及其背光控制方法
CN109360530B (zh) * 2018-10-30 2023-06-27 武汉华星光电技术有限公司 液晶显示装置及其背光控制方法

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