WO2013166756A1 - 液晶显示屏背光模组及其控制方法 - Google Patents

液晶显示屏背光模组及其控制方法 Download PDF

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Publication number
WO2013166756A1
WO2013166756A1 PCT/CN2012/076055 CN2012076055W WO2013166756A1 WO 2013166756 A1 WO2013166756 A1 WO 2013166756A1 CN 2012076055 W CN2012076055 W CN 2012076055W WO 2013166756 A1 WO2013166756 A1 WO 2013166756A1
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WO
WIPO (PCT)
Prior art keywords
backlight
module
control
liquid crystal
crystal display
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PCT/CN2012/076055
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English (en)
French (fr)
Inventor
黎飞
高新明
杨翔
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深圳市华星光电技术有限公司
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Priority to US13/522,962 priority Critical patent/US9072129B2/en
Publication of WO2013166756A1 publication Critical patent/WO2013166756A1/zh

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/38—Switched mode power supply [SMPS] using boost topology
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • 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
    • G09G2320/0653—Controlling or limiting the speed of brightness adjustment 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
    • 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
    • G09G2330/026—Arrangements or methods related to booting a display
    • 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
    • G09G2330/027—Arrangements or methods related to powering off a display
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the invention relates to the technical field of liquid crystal displays, in particular to a liquid crystal display backlight module and a control method thereof.
  • the conventional liquid crystal display includes a backlight module, a thin film transistor panel and the like.
  • the backlight module is an important component for providing a stable light source to the thin film transistor panel, so that the image provided by the thin film transistor panel can be stably display.
  • the conventional liquid crystal display backlight module includes a backlight and a backlight control device, and the backlight control device is configured to control the backlight to be turned on and off, that is, to control the liquid crystal display backlight module to be turned on and off. After the traditional LCD backlight module is turned off, the boost output to the backlight will also stop. At this time, the internal circuit of the LCD backlight module retains the charge for a certain period of time.
  • the user sometimes turns off the LCD screen and then turns it on quickly.
  • the conventional LCD backlight module is turned on quickly after being turned off, although the LCD backlight module has been turned off, the electrolytic capacitor in the internal circuit still stores a charge, and these charges cannot be quickly released in a short time.
  • the presence of electric charge causes an abnormal phenomenon when the liquid crystal display backlight module is turned on quickly after being turned off, that is, a flicker phenomenon occurs, and the flickering phenomenon makes the backlight source module provide unstable light source to the thin film transistor panel, and also reduces the light source.
  • the service life of the LCD backlight module affects the normal display of the LCD image, which is not conducive to the improvement of the LCD display quality.
  • An object of the present invention is to provide a liquid crystal display backlight module, which can avoid the phenomenon that the liquid crystal display backlight module flickers when the switch is quickly turned on and off, which is beneficial to the improvement of the display quality of the liquid crystal display.
  • Another object of the present invention is to provide a control method for a liquid crystal display backlight module, which can avoid the phenomenon that the liquid crystal display backlight module flickers when the switch is quickly turned on and off, which is beneficial to the improvement of the display quality of the liquid crystal display.
  • the present invention provides a liquid crystal display backlight module, comprising: a backlight source; a backlight source control device; the backlight source control device includes: a first switch for controlling the backlight to be turned on and off a boosting module for outputting a voltage to the backlight; a control module electrically connected to the first switch and the boosting module, for controlling the first switch, such that the backlight a source is turned on and off under control of the control module, and is configured to control the boost module such that the boost module maintains outputting a voltage to the backlight after the first switch turns off the backlight;
  • the control module is further configured to receive a backlight lighting signal, and control the boosting module according to a level of the backlight lighting signal; the control module is further configured to: when the backlight lighting signal is low Normally controlling the boosting module to output a voltage to the backlight; the control module is further configured to control the boosting module to remain toward the backlight within a predetermined time after the first switch turns off the backlight Source loss Voltage.
  • control module is further configured to determine a difference between a current time and the backlight off time after the backlight is turned off.
  • control module is further configured to control the boosting module to reduce a voltage outputted to the backlight.
  • the voltage value is linear or non-linear with respect to a time of the process.
  • control module is further configured to control the boosting module to maintain a voltage output to the backlight.
  • Another object of the present invention is to provide a liquid crystal display backlight module, which can avoid the phenomenon that the liquid crystal display backlight module flickers when the switch is quickly turned on and off, which is beneficial to the improvement of the display quality of the liquid crystal display.
  • the present invention provides a liquid crystal display backlight module, including a backlight and a backlight control device, the backlight control device comprising: a first switch for controlling the opening of the backlight and a boosting module, configured to output a voltage to the backlight; a control module electrically connected to the first switch and the boosting module, configured to control the first switch, such that the backlight Turning on and off under the control of the control module, and for controlling the boosting module such that the boosting module maintains outputting a voltage to the backlight after the first switch turns off the backlight.
  • control module is further configured to receive a backlight lighting signal, and control the boosting module according to a level of the backlight lighting signal.
  • control module is further configured to control the boosting module to output a voltage to the backlight when the backlight lighting signal is low.
  • control module is further configured to control the boosting module to maintain a voltage output to the backlight source within a predetermined time after the first switch turns off the backlight.
  • control module is further configured to determine a difference between a current time and a backlight closing time after the backlight is turned off, and if the difference is greater than a predetermined value, control the The boosting module reduces a voltage output to the backlight; if the difference is less than the predetermined value, maintaining a voltage output to the backlight.
  • Another object of the present invention is to provide a control method for a liquid crystal display backlight module, which can avoid the phenomenon that the liquid crystal display backlight module flickers when the switch is quickly turned on and off, which is beneficial to the improvement of the display quality of the liquid crystal display.
  • the present invention provides a control method for a liquid crystal display backlight module, the liquid crystal display backlight module includes a backlight and a backlight control device, and the liquid crystal display backlight module further includes a switch, a boosting module, and a control module, the control module being electrically connected to the first switch and the boosting module, the method comprising the following steps: (A), the first switch controls the backlight Turning on and off the source; (B), the boosting module outputs a voltage to the backlight; (C), the control module controls the first switch, so that the backlight is controlled by the control module Turning on and off, and controlling the boosting module such that the boosting module maintains outputting a voltage to the backlight after the first switch turns off the backlight.
  • step (C) further includes the following steps: (c1), the control module is further configured to receive a backlight lighting signal, and according to the backlight lighting signal The level of the level controls the boost module.
  • the step (c1) further includes the following steps: (c12), the control module is further configured to control the rising when the backlight lighting signal is low level
  • the voltage module outputs a voltage to the backlight.
  • step (C) further includes the following steps: (c2), the control module is further configured to: after the first switch turns off the backlight, a predetermined time Controlling the boost module to maintain a voltage output to the backlight.
  • the step (c2) further includes the following steps: (c21), the control module is further configured to determine the current time and the backlight after the backlight is turned off. The difference of the off time, if the difference is greater than the predetermined value, controlling the boosting module to reduce the voltage output to the backlight; if the difference is less than the predetermined value, maintaining a voltage output to the backlight.
  • control module of the present invention still controls the boost module to output a voltage to the backlight when the backlight is in the off state, when the backlight module of the liquid crystal display is turned on again, the backlight does not flicker, which is beneficial to the backlight of the liquid crystal display.
  • the module display quality is improved.
  • FIG. 1 is a block diagram of a liquid crystal display backlight module of the present invention
  • FIG. 2 is a schematic diagram of a circuit of a liquid crystal display backlight module of the present invention.
  • FIG. 3 is a flow chart of a method for controlling a backlight module of a liquid crystal display according to the present invention.
  • FIG. 1 is a block diagram of a backlight module of a liquid crystal display according to the present invention.
  • the liquid crystal display backlight module of the present invention comprises a backlight 101 and a backlight control device 100, and the backlight 101 can be an LED (Light) Emitting Diode, Light Bulb) Light or CCFL (Cold Cathode Fluorescent) Lamp, cold cathode fluorescent lamp), wherein the backlight control device 100 includes a boost module 103, a first switch 102, and a control module 104.
  • the first switch 102 and the boosting module 103 are both electrically connected to the backlight 101.
  • the control module 104 is electrically connected to the first switch 102 and the boost module 103.
  • control module 104 can also be electrically connected to the backlight 101 to determine whether the backlight 101 has been extinguished by detecting the voltage of the connection end of the control module 104 and the backlight 101.
  • the control module 104 is configured to receive backlight illumination (BLON, Back Light The ON) signal determines the operation to be performed by the current LCD backlight module according to the backlight illumination signal, and the control module 104 is further configured to control the boost module 103 according to the determination result, so that the boost module 103 continues to output the voltage to the backlight 101 or Stop the output voltage.
  • backlight illumination BLON, Back Light The ON
  • the control module 104 controls the first switch 102 to turn on the backlight 101. If the current LCD backlight module is to perform the operation of turning off the backlight 101 (the backlight lighting signal is a low level signal), the control module 104 controls the first switch 102 to turn off the backlight 101. At this time, the control module 104
  • the boosting module 103 sends a driving signal to enable the boosting module 103 to maintain the output of the normal voltage, that is, the boosting module 103 keeps outputting the normal voltage to the backlight 101.
  • the boosting module 103 can also output the backlight 101 to the backlight 101. Floating within 30% of the voltage of the normal voltage value.
  • the technical solution provided by the present invention solves the problem that the liquid crystal display backlight module blinks when it is turned off first and then quickly turns on.
  • the control module 104 of the liquid crystal display receives the low-level backlight lighting signal, it also passes through the boosting module 103.
  • a voltage is output to maintain the normal operation of the backlight 101, and the problem that the backlight of the liquid crystal display backlight is turned off and then turned on quickly causes a flicker.
  • the control module 104 of the liquid crystal display backlight module of the present invention controls the boosting module 103 to remain back for a predetermined time after the first switch 102 turns off the backlight 101.
  • the light source 101 outputs a voltage.
  • the control module 103 calculates a difference between the current time and the time when the backlight 101 is last turned off. If the difference is greater than a predetermined value (eg, 10 seconds), the control module 103 controls the boosting module 103 not to continue to the backlight. 101 outputs a normal voltage, or the control module 103 controls the boosting module 103 to lower the voltage outputted to the backlight 101 until it is zero; if the difference is less than the predetermined value, the output of the voltage to the backlight 101 is maintained.
  • the voltage value that the boosting module 103 reduces to the backlight 101 is linear with respect to the time of the process of reducing the operation, may be non-linear, may be reduced step by step, or may be reduced to zero at one time. Since the boosting module 103 keeps outputting the voltage to the backlight 101 while the backlight 101 is in the off state, the backlight 101 does not suddenly flash when the liquid crystal display backlight module is turned off and suddenly turned on.
  • control module 104 is electrically connected to the backlight 101, and determines whether the backlight 101 has been turned off by detecting the voltage of the connection end between the control module 104 and the backlight 101.
  • FIG. 2 is a circuit block diagram of a backlight module of a liquid crystal display according to the present invention.
  • backlight 101 includes a plurality of LED lights 209.
  • Control module 104 is chip 207.
  • the first switch 102 is a first field effect transistor 208.
  • the boost module 103 includes an inductor 201, a diode 202, and a second field effect transistor 203.
  • the chip 207 receives the backlight lighting signal. When the backlight lighting signal received by the chip 207 is a low level signal (assuming the low level signal represents the LED string 206 is turned off), the chip 207 controls the first field effect transistor 208 such that the LED The string 206 is extinguished.
  • the chip 207 will receive the LED lamp current detection signal, that is, the chip 207 knows that the LED string 206 has been extinguished, and the chip 207 switches the feedback to the voltage feedback, that is, the chip 207 opens and opens the first resistor 204 and the second resistor 205.
  • the connected port through the partial pressure of the first resistor 204 and the second resistor 205, causes the chip 207 to output a driving signal, which will be sent to the second field effect transistor 203, so that the second field effect transistor 203 is turned on (turned on)
  • the inductor 201 is caused to output a voltage to the diode 202, and the diode 202 is turned on in a direction from the inductor 201 to the backlight 101.
  • Inductor 201 and diode 202 maintain a normal voltage output to LED string 206.
  • FIG. 3 is a flowchart of a method for controlling a backlight module of a liquid crystal display according to the present invention.
  • the control module 104 receives the backlight lighting signal.
  • the control module 104 determines, according to the backlight lighting signal, an operation to be performed by the current liquid crystal display backlight module, such as turning on the backlight 101 or turning off the backlight 101.
  • the control module 104 determines whether the backlight illumination signal is a high level signal or a low level signal. If the current operation of the LCD backlight module is to turn on the backlight 101, in step 303, the control module 104 controls the first switch 102 to turn on the backlight 101.
  • the control module 104 waits for the backlight to be lit. signal. If the current backlight operation of the liquid crystal display backlight module is to turn off the backlight 101, the control module 104 controls the first switch 102 to turn off the backlight 101, and the control module 104 can be electrically connected to the backlight 101. Whether the backlight 101 has been extinguished is determined by detecting the voltage of the connection end of the control module 104 and the backlight 101.
  • the control module 104 sends a drive signal to the boost module 103 for controlling the boost module 103 to continue to output a voltage to the backlight 101 or to stop the output voltage.
  • the boost module 103 maintains a normal voltage output to the backlight 101.
  • the technical solution provided by the present invention is that after the control module 104 controls the first switch 102 to turn off the backlight 104, the voltage is still output to the backlight 101 through the boosting module 103.
  • the control module 104 of the liquid crystal display backlight module of the present invention controls the boosting module 103 to remain back for a predetermined time after the first switch 102 turns off the backlight 101.
  • the light source 101 outputs a voltage.
  • control module 104 further determines the difference between the current time and the time when the backlight 101 is turned off most recently after controlling the first switch 102 to turn off the backlight 101. If the difference is greater than a predetermined value, the control circuit 103 is controlled. The voltage is not continuously output to the backlight 101, or the control boosting circuit 103 gradually reduces the voltage outputted to the backlight 101 until it is zero; if the difference is smaller than the predetermined value, the output of the voltage to the backlight 101 is maintained.
  • the voltage value that the boosting module 103 reduces to the backlight 101 is linear with respect to the time of the process of reducing the operation, may be non-linear, may be reduced step by step, or may be reduced to zero at one time.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

一种液晶显示屏背光模组，包括背光源（101）和背光源控制装置（100），背光源控制装置（100）包括：第一开关（102）；升压模块（103）；控制模块（104），用于控制第一开关（102），使得背光源（101）在控制模块（104）的控制下开启和关闭，以及用于控制升压模块（103），使得升压模块（103）在第一开关（102）关闭背光源（101）后保持向背光源（101）输出电压。

Description

液晶显示屏背光模组及其控制方法 技术领域
本发明涉及液晶显示屏的技术领域，特别涉及一种液晶显示屏背光模组及其控制方法。
 背景技术
传统的液晶显示屏包括背光模组、薄膜晶体管面板等器件，其中，背光模组是一个重要的组成部分，用于向薄膜晶体管面板提供稳定的光源，使得薄膜晶体管面板所提供的图像能够稳定地显示。传统的液晶显示屏背光模组包括背光源和背光源控制装置，该背光源控制装置用于控制该背光源的开启和关闭，即，控制液晶显示屏背光模组开机和关机。传统的液晶显示屏背光模组在关机后，向背光源的升压（Boost）驱动输出也会停止，此时，液晶显示屏背光模组的内部电路中在一定时间内仍保留有电荷。
用户在使用液晶显示屏的过程中，有时会将液晶显示屏关机后又迅速开机。当传统的液晶显示屏背光模组在关机后又迅速开机时，虽然该液晶显示屏背光模组已经关机，但是内部电路中电解电容仍然储有电荷，这些电荷不能在短时间内迅速释放，这些电荷的存在会使液晶显示屏背光模组在关机后又迅速开机时会出现异常现象，即出现闪烁现象，该闪烁现象使得该背光模组向薄膜晶体管面板提供的光源不稳定，同时也会降低液晶显示屏背光模组的使用寿命，影响了液晶显示屏的图像的正常显示，不利于液晶显示屏显示品质的提升。
 技术问题
本发明的一个目的在于提供一种液晶显示屏背光模组，其能避免液晶显示屏背光模组在迅速开关机时出现闪烁的现象，有利于液晶显示屏显示品质的提升。
本发明的另一个目的在于提供一种液晶显示屏背光模组的控制方法，其能避免液晶显示屏背光模组在迅速开关机时出现闪烁的现象，有利于液晶显示屏显示品质的提升。
 技术解决方案
本发明提供了一种液晶显示屏背光模组，其包括：一背光源；一背光源控制装置；所述背光源控制装置包括：一第一开关，用于控制所述背光源的开启和关闭；一升压模块，用于向所述背光源输出电压；一控制模块，其与所述第一开关和所述升压模块电性连接，用于控制所述第一开关，使得所述背光源在所述控制模块的控制下开启和关闭，以及用于控制所述升压模块，使得所述升压模块在所述第一开关关闭所述背光源后保持向所述背光源输出电压；所述控制模块还用于接收背光点亮信号，并根据所述背光点亮信号的电平的高低控制所述升压模块；所述控制模块还用于在所述背光点亮信号为低电平时控制所述升压模块向所述背光源输出电压；所述控制模块还用于在所述第一开关关闭所述背光源后的预定时间内，控制所述升压模块保持向所述背光源输出电压。
在上述液晶显示屏背光模组中，所述控制模块还用于在所述背光源关闭后判断当前时间与所述背光源关闭时间的差值。
在上述液晶显示屏背光模组中，若所述差值大于所述预定时间，所述控制模块还用于控制所述升压模块降低向所述背光源输出的电压。
在上述液晶显示屏背光模组中，在所述升压模块降低向所述背光源输出的电压值的过程中，所述电压值相对于所述过程的时间是线性的或非线性的。
在上述液晶显示屏背光模组中，若所述差值小于所述预定时间，所述控制模块还用于控制所述升压模块保持向背光源输出电压。
本发明的另一个目的在于提供一种液晶显示屏背光模组，其能避免液晶显示屏背光模组在迅速开关机时出现闪烁的现象，有利于液晶显示屏显示品质的提升。
为解决上述技术问题，本发明提供了一种液晶显示屏背光模组，包括背光源和背光源控制装置，所述背光源控制装置包括：第一开关，用于控制所述背光源的开启和关闭；升压模块，用于向所述背光源输出电压；控制模块，其与所述第一开关和所述升压模块电性连接，用于控制所述第一开关，使得所述背光源在所述控制模块的控制下开启和关闭，以及用于控制所述升压模块，使得所述升压模块在所述第一开关关闭所述背光源后保持向所述背光源输出电压。
在上述液晶显示屏背光模组中，所述控制模块还用于接收背光点亮信号，并根据所述背光点亮信号的电平的高低控制所述升压模块。
在上述液晶显示屏背光模组中，所述控制模块还用于在所述背光点亮信号为低电平时控制所述升压模块向所述背光源输出电压。
在上述液晶显示屏背光模组中，所述控制模块还用于在所述第一开关关闭所述背光源后的预定时间内，控制所述升压模块保持向所述背光源输出电压。
在上述液晶显示屏背光模组中，所述控制模块还用于在所述背光源关闭后判断当前时间与所述背光源关闭时间的差值，若该差值大于预定值，则控制所述升压模块降低向所述背光源输出的电压；若所述差值小于所述预定值，则保持向背光源输出电压。
本发明的另一个目的在于提供一种液晶显示屏背光模组的控制方法，其能避免液晶显示屏背光模组在迅速开关机时出现闪烁的现象，有利于液晶显示屏显示品质的提升。
为解决上述技术问题，本发明提供了一种液晶显示屏背光模组的控制方法，所述液晶显示屏背光模组包括背光源和背光源控制装置，所述液晶显示屏背光模组还包括第一开关、升压模块和控制模块，所述控制模块与所述第一开关和所述升压模块电性连接，所述方法包括以下步骤：（A）、所述第一开关控制所述背光源的开启和关闭；（B）、所述升压模块向所述背光源输出电压；（C）、所述控制模块控制所述第一开关，使得所述背光源在所述控制模块的控制下开启和关闭，以及控制所述升压模块，使得所述升压模块在所述第一开关关闭所述背光源后保持向所述背光源输出电压。
在上述液晶显示屏背光模组的控制方法中，所述步骤（C）还包括以下步骤：（c1）、所述控制模块还用于接收背光点亮信号，并根据所述背光点亮信号的电平的高低控制所述升压模块。
在上述液晶显示屏背光模组的控制方法中，所述步骤（c1）还包括以下步骤：（c12）、所述控制模块还用于在所述背光点亮信号为低电平时控制所述升压模块向所述背光源输出电压。
在上述液晶显示屏背光模组的控制方法中，所述步骤（C）还包括以下步骤：（c2）、所述控制模块还用于在所述第一开关关闭所述背光源后的预定时间内，控制所述升压模块保持向所述背光源输出电压。
在上述液晶显示屏背光模组的控制方法中，所述步骤（c2）还包括以下步骤：（c21）、所述控制模块还用于在所述背光源关闭后判断当前时间与所述背光源关闭时间的差值，若该差值大于预定值，则控制所述升压模块降低向所述背光源输出的电压；若所述差值小于所述预定值，则保持向背光源输出电压。
 有益效果
由于本发明的控制模块在背光源处于关闭状态时仍然控制升压模块向背光源输出电压，因此在液晶显示屏背光模组再次开机时，背光源不会出现闪烁的现象，有利于液晶显示屏背光模组显示品质的提升。
 附图说明
图1为本发明的液晶显示屏背光模组的框图；
图2为本发明的液晶显示屏背光模组的电路的示意图；
图3为本发明的液晶显示屏背光模组控制方法的流程图。
 本发明的最佳实施方式
以下各实施例的说明是参考附加的图式，用以例示本发明可用以实施的特定实施例。
参考图1，图1为本发明的液晶显示屏背光模组的框图。本发明的液晶显示屏背光模组包括背光源101和背光源控制装置100，背光源101可以是LED（Light Emitting Diode，发光二极管）灯或CCFL（Cold Cathode Fluorescent Lamp，冷阴极萤光灯），其中背光源控制装置100包括升压（Boost）模块103、第一开关102和控制模块104。该第一开关102和升压模块103均与背光源101电性连接。控制模块104电性连接第一开关102和升压模块103。当然，控制模块104还可以与背光源101电性连接，通过侦测控制模块104与背光源101的连接端的电压来判断背光源101是否已经熄灭。控制模块104用于接收背光点亮（BLON，Back Light ON）信号并根据该背光点亮信号判断当前液晶显示屏背光模组要执行的操作，控制模块104还用于根据判断结果控制升压模块103，使升压模块103继续向背光源101输出电压或停止输出电压。若当前液晶显示屏背光模组要执行的操作为开启背光源101（背光点亮信号为高电平信号），则控制模块104控制第一开关102开启背光源101。若当前液晶显示屏背光模组要执行的操作为关闭背光源101（背光点亮信号为低电平信号），则控制模块104控制第一开关102关闭背光源101，此时，控制模块104向升压模块103发送驱动信号以使升压模块103维持正常电压的输出，即升压模块103保持向背光源101输出正常电压，具体实现时，升压模块103也可以向背光源101输出约等于（上下浮动30%以内）正常电压值的电压。
本发明提供的技术方案为解决液晶显示屏背光模组在先关机然后迅速开机时闪烁的问题，在液晶显示屏的控制模块104接收到低电平的背光点亮信号后还通过升压模块103输出一个电压，以维持背光源101正常运行，避免液晶显示屏背光模组在先关机然后迅速开机时导致闪烁的问题。在具体实现时，出于安全性及稳定性的考虑，本发明的液晶显示屏背光模组的控制模块104在第一开关102关闭背光源101后的预定时间内，控制升压模块103保持向背光源101输出电压。
具体地，控制模块103计算当前的时间与背光源101最近一次关闭的时间的差值，若该差值大于一预定值（如10秒），则控制模块103控制升压模块103不继续向背光源101输出正常电压，或者，控制模块103控制升压模块103降低向背光源101输出的电压，直至为零；若该差值小于该预定值，则保持向背光源101输出电压。升压模块103所降低向背光源101输出的电压值相对于此降低操作的过程的时间是线性的，也可以是非线性的，还可以逐级降低的，或者一次性降低为零。由于升压模块103在背光源101处于关闭状态下仍保持向背光源101输出电压，因此在液晶显示屏背光模组关机后又突然开机时，背光源101不会出现突然闪烁的现象。
具体实现本发明技术方案时，控制模块104与背光源101电性连接，通过侦测控制模块104与背光源101的连接端的电压来判断背光源101是否已经关闭。
参考图2，图2为本发明的液晶显示屏背光模组的电路方块示意图。在本示意图中，背光源101包括多个LED灯209。控制模块104为芯片207。第一开关102为第一场效应晶体管208。升压模块103包括电感201、二极管202和第二场效应晶体管203。芯片207接收背光点亮信号，当芯片207接收到的背光点亮信号为低电平信号（假设低电平信号代表关闭LED灯串206）时，芯片207控制第一场效应晶体管208，使得LED灯串206熄灭。此时芯片207将会接收到LED灯电流侦测信号，即芯片207获知LED灯串206已经熄灭，芯片207将反馈切换到电压反馈，即芯片207打开与打开第一电阻204和第二电阻205连接的端口，通过第一电阻204和第二电阻205的分压使芯片207输出驱动信号，该驱动信号将会被发送到第二场效应晶体管203，使得第二场效应晶体管203打开（导通），然后使得电感201向二极管202输出电压，二极管202导通的方向为从电感201指向背光源101的方向。电感201和二极管202保持向LED灯串206输出正常电压。
参考图3，图3为本发明的液晶显示屏背光模组控制方法的流程图。在步骤301，控制模块104接收背光点亮信号；在步骤302，控制模块104根据该背光点亮信号判断当前液晶显示屏背光模组要执行的操作，如开启背光源101或关闭背光源101，控制模块104是根据该背光点亮信号是高电平信号还是低电平信号来判断的。若当前液晶显示屏背光模组要执行的操作为开启背光源101时，在步骤303，控制模块104控制第一开关102以开启背光源101，在步骤303后，控制模块104等待接收背光点亮信号。若当前液晶显示屏背光模组要执行的操作为关闭背光源101时，在步骤304，控制模块104控制第一开关102以关闭背光源101，控制模块104还可以与背光源101电性连接，通过侦测控制模块104与背光源101的连接端的电压来判断背光源101是否已经熄灭。在步骤305，控制模块104向升压模块103发送驱动信号，该驱动信号用于控制升压模块103继续向背光源101输出电压或停止输出电压。在步骤306，升压模块103保持向背光源101输出正常电压。
本发明提供的技术方案为在控制模块104控制第一开关102关闭背光源104后还通过升压模块103仍然向背光源101输出电压。在具体实现时，出于安全性及稳定性的考虑，本发明的液晶显示屏背光模组的控制模块104在第一开关102关闭背光源101后的预定时间内，控制升压模块103保持向背光源101输出电压。
具体地，控制模块104在控制第一开关102关闭背光源101后进一步判断当前的时间与最近一次关闭背光源101的时间的差值，若该差值大于一预定值，则控制升压电路103不继续向背光源101输出电压，或者，控制升压电路103逐渐降低向背光源101输出的电压，直至为零；若该差值小于该预定值，则保持向背光源101输出电压。升压模块103所降低向背光源101输出的电压值相对于此降低操作的过程的时间是线性的，也可以是非线性的，还可以逐级降低的，或者一次性降低为零。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。
 本发明的实施方式
工业实用性
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Claims (15)

  1. 一种液晶显示屏背光模组，其包括：
    一背光源；
    一背光源控制装置；
    所述背光源控制装置包括：
    一第一开关，用于控制所述背光源的开启和关闭；
    一升压模块，用于向所述背光源输出电压；
    一控制模块，其与所述第一开关和所述升压模块电性连接，用于控制所述第一开关，使得所述背光源在所述控制模块的控制下开启和关闭，以及用于控制所述升压模块，使得所述升压模块在所述第一开关关闭所述背光源后保持向所述背光源输出电压；
    所述控制模块还用于接收背光点亮信号，并根据所述背光点亮信号的电平的高低控制所述升压模块；
    所述控制模块还用于在所述背光点亮信号为低电平时控制所述升压模块向所述背光源输出电压；
    所述控制模块还用于在所述第一开关关闭所述背光源后的预定时间内，控制所述升压模块保持向所述背光源输出电压。
  2. 根据权利要求1所述的液晶显示屏背光模组，其中
    所述控制模块还用于在所述背光源关闭后判断当前时间与所述背光源关闭时间的差值。
  3. 根据权利要求2所述的液晶显示屏背光模组，其中
    若所述差值大于所述预定时间，所述控制模块还用于控制所述升压模块降低向所述背光源输出的电压。
  4. 根据权利要求3所述的液晶显示屏背光模组，其中
    在所述升压模块降低向所述背光源输出的电压值的过程中，所述电压值相对于所述过程的时间是线性的或非线性的。
  5. 根据权利要求2所述的液晶显示屏背光模组，其中
    若所述差值小于所述预定时间，所述控制模块还用于控制所述升压模块保持向背光源输出电压。
  6. 一种液晶显示屏背光模组，包括背光源和背光源控制装置，其中
    所述背光源控制装置包括：
    第一开关，用于控制所述背光源的开启和关闭；
    升压模块，用于向所述背光源输出电压；
    控制模块，其与所述第一开关和所述升压模块电性连接，用于控制所述第一开关，使得所述背光源在所述控制模块的控制下开启和关闭，以及用于控制所述升压模块，使得所述升压模块在所述第一开关关闭所述背光源后保持向所述背光源输出电压。
  7. 根据权利要求6所述的液晶显示屏背光模组，其中
    所述控制模块还用于接收背光点亮信号，并根据所述背光点亮信号的电平的高低控制所述升压模块。
  8. 根据权利要求7所述的液晶显示屏背光模组，其中
    所述控制模块还用于在所述背光点亮信号为低电平时控制所述升压模块向所述背光源输出电压。
  9. 根据权利要求6所述的液晶显示屏背光模组，其中
    所述控制模块还用于在所述第一开关关闭所述背光源后的预定时间内，控制所述升压模块保持向所述背光源输出电压。
  10. 根据权利要求9所述的液晶显示屏背光模组，其中
    所述控制模块还用于在所述背光源关闭后判断当前时间与所述背光源关闭时间的差值，若该差值大于预定值，则控制所述升压模块降低向所述背光源输出的电压；若所述差值小于所述预定值，则保持向背光源输出电压。
  11. 一种液晶显示屏背光模组的控制方法，所述液晶显示屏背光模组包括背光源和背光源控制装置，其中
    所述液晶显示屏背光模组还包括第一开关、升压模块和控制模块，所述控制模块与所述第一开关和所述升压模块电性连接，所述方法包括以下步骤：
    （A）、所述第一开关控制所述背光源的开启和关闭；
    （B）、所述升压模块向所述背光源输出电压；
    （C）、所述控制模块控制所述第一开关，使得所述背光源在所述控制模块的控制下开启和关闭，以及控制所述升压模块，使得所述升压模块在所述第一开关关闭所述背光源后保持向所述背光源输出电压。
  12. 根据权利要求11所述的液晶显示屏背光模组的控制方法，其中
    所述步骤（C）还包括以下步骤：
    （c1）、所述控制模块还用于接收背光点亮信号，并根据所述背光点亮信号的电平的高低控制所述升压模块。
  13. 根据权利要求12所述的液晶显示屏背光模组的控制方法，其中
    所述步骤（c1）还包括以下步骤：
    （c12）、所述控制模块还用于在所述背光点亮信号为低电平时控制所述升压模块向所述背光源输出电压。
  14. 根据权利要求11所述的液晶显示屏背光模组的控制方法，其中
    所述步骤（C）还包括以下步骤：
    （c2）、所述控制模块还用于在所述第一开关关闭所述背光源后的预定时间内，控制所述升压模块保持向所述背光源输出电压。
  15. 根据权利要求14所述的液晶显示屏背光模组的控制方法，其中
    所述步骤（c2）还包括以下步骤：
    （c21）、所述控制模块还用于在所述背光源关闭后判断当前时间与所述背光源关闭时间的差值，若该差值大于预定值，则控制所述升压模块降低向所述背光源输出的电压；若所述差值小于所述预定值，则保持向背光源输出电压。
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CN103927993B (zh) * 2013-12-18 2016-04-27 上海中航光电子有限公司 显示屏背光控制电路、方法及显示设备
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