WO2015074293A1 - 背光源调节电路及液晶显示装置 - Google Patents

背光源调节电路及液晶显示装置 Download PDF

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Publication number
WO2015074293A1
WO2015074293A1 PCT/CN2013/088426 CN2013088426W WO2015074293A1 WO 2015074293 A1 WO2015074293 A1 WO 2015074293A1 CN 2013088426 W CN2013088426 W CN 2013088426W WO 2015074293 A1 WO2015074293 A1 WO 2015074293A1
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WIPO (PCT)
Prior art keywords
backlight
module
width modulation
pulse width
modulation signal
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PCT/CN2013/088426
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English (en)
French (fr)
Inventor
陈辛洪
杨翔
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US14/130,322 priority Critical patent/US9232585B2/en
Publication of WO2015074293A1 publication Critical patent/WO2015074293A1/zh
Anticipated expiration legal-status Critical
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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
    • 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
    • H05B47/16—Controlling the light source by timing means
    • 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
    • G09G2354/00—Aspects of interface with display user
    • 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
    • G09G3/36—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 using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix

Definitions

  • the present invention relates to the field of liquid crystal display technology, and in particular, to a backlight adjustment circuit and a liquid crystal display device.
  • the current multi-string LED driver usually uses MCU with dedicated LED driver.
  • IC which implements functions such as current balance and dimming.
  • different LEDs are usually required.
  • the driver is debugging, and there are many peripheral circuits in the driver architecture, which makes the development cycle longer.
  • the main object of the present invention is to provide a backlight adjustment circuit, which aims to achieve integration and convergence of various LED backlight schemes, improve the range of circuit applications, and shorten the development cycle.
  • the present invention provides a backlight adjustment circuit including a pulse width modulation signal generation module, a digital to analog conversion module, and a current driving module;
  • a pulse width modulation signal generating module for generating a pulse width modulation signal to the current driving module
  • the digital-to-analog conversion module receives an operation instruction input by a user, and outputs a preset voltage to the current driving module according to an operation instruction input by the user;
  • the current driving module receives the pulse width modulation signal, and amplifies the pulse width modulation signal according to the preset voltage, and outputs the signal to an electronic switch for controlling backlight on/off to control the backlight On/off.
  • the backlight adjustment circuit further includes a receiving module, a storage module, and a control module, where
  • the receiving module is configured to receive backlight enable data and backlight shutdown data
  • the storage module is configured to store the backlight open data and the backlight close data
  • the control module controls a time when the pulse width modulation signal generating module outputs a high level according to the backlight opening data, and controls a time when the pulse width modulation signal generating module outputs a low level according to the backlight closing data.
  • the storage module includes a first storage unit for storing the backlight shutdown data and a second storage unit for storing the backlight activation data.
  • control module includes a first counter and a second counter
  • the first counter reads the backlight off data stored by the first storage unit, and displays a trigger point of the synchronization signal on the screen, the first counter outputs a first control signal to the pulse width modulation signal generating module;
  • the pulse width modulation signal generating module outputs a low level according to the first control signal; when the count value of the first counter is equal to a value of the backlight off data, outputting a second control signal to the pulse width And modulating a signal generating module and the second counter to control the second counter to start timing, controlling the pulse width modulation signal generating module to output a high level; when the second counter is equal to the backlight
  • the value of the data outputs a third control signal to the pulse width modulation signal generating module, and the pulse width modulation signal generating module outputs a low level according to the third control signal.
  • the receiving module is a serial interface circuit.
  • the electronic switch is a triode;
  • the current driving module is an operational amplifier, and a forward input end of the operational amplifier is respectively connected to an output end of the pulse width modulation signal generating module and an output end of the digital to analog conversion module.
  • the inverting input is coupled to the emitter of the transistor, and the output is coupled to the base of the transistor.
  • the backlight adjustment circuit further includes an analog-to-digital conversion module, an input end of the analog-to-digital conversion module is connected to a collector of the triode, and is controlled according to a voltage output control signal detected at an input end of the analog-to-digital conversion module. The working state of the backlight.
  • the backlight adjustment circuit is an integrated circuit.
  • the present invention also provides a liquid crystal display device including a backlight adjustment circuit, the backlight adjustment circuit including a pulse width modulation signal generation module, a digital to analog conversion module, and a current driving module;
  • a pulse width modulation signal generating module for generating a pulse width modulation signal to the current driving module
  • the digital-to-analog conversion module receives an operation instruction input by a user, and outputs a preset voltage to the current driving module according to an operation instruction input by the user;
  • the current driving module receives the pulse width modulation signal, and amplifies the pulse width modulation signal according to the preset voltage, and outputs the signal to an electronic switch for controlling backlight on/off to control the backlight On/off.
  • the backlight adjustment circuit further includes a receiving module, a storage module, and a control module, where
  • the receiving module is configured to receive backlight enable data and backlight shutdown data
  • the storage module is configured to store the backlight open data and the backlight close data
  • the control module controls a time when the pulse width modulation signal generating module outputs a high level according to the backlight opening data, and controls a time when the pulse width modulation signal generating module outputs a low level according to the backlight closing data.
  • the storage module includes a first storage unit for storing the backlight shutdown data and a second storage unit for storing the backlight activation data.
  • control module includes a first counter and a second counter
  • the first counter reads the backlight off data stored by the first storage unit, and displays a trigger point of the synchronization signal on the screen, the first counter outputs a first control signal to the pulse width modulation signal generating module;
  • the pulse width modulation signal generating module outputs a low level according to the first control signal; when the count value of the first counter is equal to a value of the backlight off data, outputting a second control signal to the pulse width And modulating a signal generating module and the second counter to control the second counter to start timing, controlling the pulse width modulation signal generating module to output a high level; when the second counter is equal to the backlight
  • the value of the data outputs a third control signal to the pulse width modulation signal generating module, and the pulse width modulation signal generating module outputs a low level according to the third control signal.
  • the receiving module is a serial interface circuit.
  • the electronic switch is a triode;
  • the current driving module is an operational amplifier, and a forward input end of the operational amplifier is respectively connected to an output end of the pulse width modulation signal generating module and an output end of the digital to analog conversion module.
  • the inverting input is coupled to the emitter of the transistor, and the output is coupled to the base of the transistor.
  • the backlight adjustment circuit further includes an analog-to-digital conversion module, an input end of the analog-to-digital conversion module is connected to a collector of the triode, and is controlled according to a voltage output control signal detected at an input end of the analog-to-digital conversion module. The working state of the backlight.
  • the backlight adjustment circuit is an integrated circuit.
  • the invention adjusts the input voltage input to the current driving module by setting the digital-to-analog conversion module, thereby adjusting the driving current of the input backlight. Since the backlight adjustment circuit provided by the present invention can be applied to backlights with different driving currents, thereby achieving integration and convergence of various LED backlight schemes, the backlight adjustment circuit provided by the present invention improves the range of circuit applications and shortens The cycle of research and development.
  • FIG. 1 is a schematic diagram showing the circuit structure of a first embodiment of a backlight adjustment circuit according to the present invention
  • FIG. 2 is a schematic view showing the circuit structure of a second embodiment of the backlight adjustment circuit of the present invention.
  • the invention provides a backlight adjustment circuit.
  • FIG. 1 is a schematic diagram of a circuit structure of a first embodiment of a backlight adjustment circuit according to the present invention
  • FIG. 2 is a schematic diagram of a circuit structure of a second embodiment of a backlight adjustment circuit according to the present invention.
  • the backlight adjustment circuit provided in this embodiment includes a pulse width modulation signal generating module 10, a digital-to-analog conversion module 20, and a current driving module 30;
  • the pulse width modulation signal generating module 10 is configured to generate a pulse width modulation signal to the current driving module 30;
  • the digital-to-analog conversion module 20 receives an operation command input by a user, and outputs a preset voltage to the current drive module 30 according to an operation command input by the user;
  • the current driving module 30 receives the pulse width modulation signal, and amplifies the pulse width modulation signal according to the preset voltage, and outputs the signal to an electronic switch K for controlling backlight on/off to control the The backlight is turned on/off.
  • the pulse width modulation signal generating module 10 can be configured as an integrated circuit, and the digital-to-analog conversion module 20 and the current driving module 30 are peripheral circuits of the integrated circuit, as shown in FIG. 2, and the B region in FIG.
  • the integrated circuit area; the digital-to-analog conversion module 20 and the current driving module 30 can also be integrated into the MCU to form an integrated circuit.
  • the area of the integrated circuit in FIG. 1 is A area;
  • the pulse width modulation signal generating module 10, the digital to analog conversion module 20, and the current driving module 30 are disposed on the printed circuit board in a separate circuit configuration.
  • the output voltage of the digital-to-analog conversion module 20 can be selected according to actual needs. For example, an operation interface can be provided for the user to set parameters.
  • the digital-to-analog conversion module 20 first analyzes the input according to the user's input. The preset voltage is output to the current driving module 30, and then the voltage output from the digital-to-analog conversion module 20 to the current driving module 30 is adjusted according to the preset voltage.
  • the present invention adjusts the input voltage input to the current driving module 30 by setting the digital-to-analog conversion module 20, thereby adjusting the driving current of the input backlight. Since the backlight adjustment circuit provided by the present invention can be applied to backlights with different driving currents, thereby achieving integration and convergence of various LED backlight schemes, the backlight adjustment circuit provided by the present invention improves the range of circuit applications and shortens The cycle of research and development.
  • the backlight adjustment circuit further includes a receiving module 40, a storage module 50, and a control module 60, where
  • the receiving module 40 is configured to receive backlight enable data and backlight shutdown data
  • the storage module 50 is configured to store the backlight enable data and the backlight shutdown data
  • the control module 60 controls a time when the pulse width modulation signal generating module outputs a high level according to the backlight opening data, and controls a time when the pulse width modulation signal generating module outputs a low level according to the backlight closing data.
  • the manner in which the backlight source data and the backlight source data are stored may be set according to actual needs.
  • the backlight source data and the backlight source data may be separately stored separately.
  • the storage module 50 includes a first storage unit 51 for storing the backlight shutdown data and a second storage unit 52 for storing the backlight activation data.
  • the circuit structure of the receiving module 40 can be set according to actual needs, as long as it can receive the TFT-LCD master IC (Timing The backlight output data (Duty Data) and the backlight data (Delay Data) may be output.
  • the receiving module 40 is preferably a serial interface circuit.
  • the control module 60 reads the backlight shutdown data stored in the first storage unit 51 and the backlight activation data stored in the second storage unit 52, and converts the data into time. Specifically, the control module 60 converts the backlight off data into a time when the backlight is turned off (the backlight off time should be described as an extended time from the screen input to the display in one display period), and the backlight is turned on. The time that the backlight is turned on.
  • the control module 60 controls the pulse width modulation signal generating module 10 to output a low level of time for which the backlight is off. Then, the control pulse width modulation signal generating module 10 outputs a low level after the high level of the output time length is the time when the backlight is turned on. Thereby, the display of one cycle is completed, and when the trigger point of the next cycle comes, the above operation is repeatedly performed.
  • control module 60 includes a first counter 61 and a second counter 62;
  • the first counter 61 reads the backlight shutdown data stored by the first storage unit 51, and displays a trigger point of the synchronization signal Vsync on the screen, and the first counter 61 outputs a first control signal to the pulse width modulation.
  • a signal generating module 10 the pulse width modulation signal generating module 10 outputs a low level according to the first control signal; when the count value of the first counter 61 is equal to the value of the backlight off data, the second output Controlling signals to the pulse width modulation signal generating module 10 and the second counter 62 to control the second counter 62 to start timing, and controlling the pulse width modulation signal generating module 10 to output a high level;
  • the third control signal is output to the pulse width modulation signal generating module 10, and the pulse width modulation signal generating module 10 outputs according to the third control signal. Low level.
  • the value of the backlight off data and the value of the backlight on data are set by Timing. Control is calculated by an internal preset algorithm. For example, when the value of the backlight-off data is 50 and the value of the backlight-on data is 100, the screen display synchronization signal Vsync is received by the first counter 61, and the first counter 61 is reached when the trigger point of the screen display synchronization signal Vsync arrives.
  • the first counter 61 starts counting, and the first counter 61 outputs a first control signal to control the pulse width modulation signal generating module 10 to output a low level; when the first counter 61 has a count value of 50, the second control signal is output to the control pulse width modulation
  • the signal generating module 10 outputs a high level, and controls the second counter 62 to start counting; and when the count value of the second counter 62 is 100, the second counter 62 outputs a third control signal to control the output of the pulse width modulation signal generating module 10. Low level.
  • the electronic switch K is a triode;
  • the current driving module 30 is an operational amplifier, and the forward input end of the operational amplifier and the pulse width modulation signal generating module 10 are respectively
  • the output terminal is connected to the output of the digital-to-analog conversion module 20, the inverting input terminal is connected to the emitter of the triode, and the output terminal is connected to the base of the triode.
  • the triode is an NPN transistor, the emitter thereof is grounded through a resistor R, and the collector is connected to the backlight.
  • the backlight adjustment circuit further includes an analog-to-digital conversion module 70, and the input end of the analog-to-digital conversion module 70 is connected to the collector of the triode and converted according to analog to digital The voltage detected at the input of module 70 analyzes the state of operation of the backlight.
  • the backlight can be analyzed according to the voltage of the collector of the triode, and the backlight is open.
  • the lamp protect (LED open circuit) and LED short protect (LED short circuit) phenomenon the corresponding control signal is output to the protection circuit to realize the LED Open circuit protection and LED short circuit protection.
  • the backlight adjustment circuit may be preferably configured as an integrated circuit.
  • the integration degree of the chip is improved relative to the MCU for outputting the pulse width modulation signal in the prior art.
  • the present invention also provides a liquid crystal display device, which includes a backlight adjustment circuit.
  • the structure of the backlight adjustment circuit can be referred to the above embodiment, and details are not described herein.
  • the liquid crystal display device of the present embodiment adopts the above-described technical solution of the backlight adjusting circuit, the liquid crystal display device has all the advantageous effects of the above-described backlight adjusting circuit.

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

Abstract

一种背光源调节电路及具有该背光源调节电路的液晶显示装置，背光源调节电路包括脉宽调制信号产生模块（10）、数模转换模块（20）和电流驱动模块（30）；脉宽调制信号产生模块（10）用于产生脉宽调制信号至电流驱动模块（30）；数模转换模块（20）接收用户输入的操作指令，并根据用户输入的操作指令输出预置电压至电流驱动模块（30）；电流驱动模块（30）接收脉宽调制信号，并根据预置电压对脉宽调制信号进行放大后输出至用于控制背光源开启/关闭的电子开关，以控制背光源的开启/关闭。实现了对多种LED背光方案进行整合收敛，提高了电路应用的范围，缩短了研发周期。

Description

背光源调节电路及液晶显示装置
技术领域
本发明涉及液晶显示技术领域，特别涉及一种背光源调节电路及液晶显示装置。
背景技术
众所周知，目前多串LED驱动通常采用MCU搭配专用LED driver IC，实现电流平衡和调光等功能。在选用这些专用LED driver时，根据背光架构的不同，通常需要选用不同的LED driver进行调试，而且种驱动架构外围电路较多，因此使得研发周期较长。
发明内容
本发明的主要目的在于提供一种背光源调节电路，旨在实现对多种LED背光方案进行整合收敛，提高电路应用的范围，缩短研发周期。
为了实现上述目的，本发明提供一种背光源调节电路，所述背光源调节电路包括脉宽调制信号产生模块、数模转换模块和电流驱动模块；
脉宽调制信号产生模块用于产生脉宽调制信号至所述电流驱动模块；
所述数模转换模块接收用户输入的操作指令，并根据用户输入的操作指令输出预置电压至所述电流驱动模块；
所述电流驱动模块接收所述脉宽调制信号，并根据所述预置电压对所述脉宽调制信号进行放大后输出至用于控制背光源开启/关闭的电子开关，以控制所述背光源的开启/关闭。
优选地，所述背光源调节电路还包括接收模块、储存模块和控制模块，其中，
所述接收模块用于接收背光源开启数据和背光源关闭数据；
所述储存模块用于储存所述背光源开启数据和背光源关闭数据；
所述控制模块根据所述背光源开启数据控制所述脉宽调制信号产生模块输出高电平的时间，根据背光源关闭数据控制所述脉宽调制信号产生模块输出低电平的时间。
优选地，所述储存模块包括用于储存所述背光源关闭数据的第一储存单元和用于储存所述背光源开启数据的第二储存单元。
优选地，所述控制模块包括第一计数器和第二计数器；
所述第一计数器读取所述第一储存单元存储的背光源关闭数据，并在画面显示同步信号的触发点，所述第一计数器输出第一控制信号至所述脉宽调制信号产生模块；所述脉宽调制信号产生模块根据所述第一控制信号输出低电平；当所述第一计数器的计数值等于所述背光源关闭数据的数值时，输出第二控制信号至所述脉宽调制信号产生模块和所述第二计数器，以控制所述第二计数器开始计时，控制所述脉宽调制信号产生模块输出高电平；当所述第二计数器的计数值等于所述背光源开启数据的数值时，输出第三控制信号至所述脉宽调制信号产生模块，所述脉宽调制信号产生模块根据所述第三控制信号输出低电平。
优选地，所述接收模块为串行接口电路。
优选地，所述电子开关为三极管；所述电流驱动模块为运算放大器，所述运算放大器的正向输入端分别与所述脉宽调制信号产生模块的输出端和数模转换模块的输出端连接，反向输入端与所述三极管的发射极连接，输出端与所述三极管的基极连接。
优选地，所述背光源调节电路还包括模数转换模块，所述模数转换模块的输入端与所述三极管的集电极连接，并根据模数转换模块的输入端检测的电压输出控制信号控制背光源的工作状态。
优选地，所述背光源调节电路为集成电路。
本发明还提供一种液晶显示装置，所述液晶显示装置包括背光源调节电路，所述背光源调节电路包括脉宽调制信号产生模块、数模转换模块和电流驱动模块；
脉宽调制信号产生模块用于产生脉宽调制信号至所述电流驱动模块；
所述数模转换模块接收用户输入的操作指令，并根据用户输入的操作指令输出预置电压至所述电流驱动模块；
所述电流驱动模块接收所述脉宽调制信号，并根据所述预置电压对所述脉宽调制信号进行放大后输出至用于控制背光源开启/关闭的电子开关，以控制所述背光源的开启/关闭。
优选地，所述背光源调节电路还包括接收模块、储存模块和控制模块，其中，
所述接收模块用于接收背光源开启数据和背光源关闭数据；
所述储存模块用于储存所述背光源开启数据和背光源关闭数据；
所述控制模块根据所述背光源开启数据控制所述脉宽调制信号产生模块输出高电平的时间，根据背光源关闭数据控制所述脉宽调制信号产生模块输出低电平的时间。
优选地，所述储存模块包括用于储存所述背光源关闭数据的第一储存单元和用于储存所述背光源开启数据的第二储存单元。
优选地，所述控制模块包括第一计数器和第二计数器；
所述第一计数器读取所述第一储存单元存储的背光源关闭数据，并在画面显示同步信号的触发点，所述第一计数器输出第一控制信号至所述脉宽调制信号产生模块；所述脉宽调制信号产生模块根据所述第一控制信号输出低电平；当所述第一计数器的计数值等于所述背光源关闭数据的数值时，输出第二控制信号至所述脉宽调制信号产生模块和所述第二计数器，以控制所述第二计数器开始计时，控制所述脉宽调制信号产生模块输出高电平；当所述第二计数器的计数值等于所述背光源开启数据的数值时，输出第三控制信号至所述脉宽调制信号产生模块，所述脉宽调制信号产生模块根据所述第三控制信号输出低电平。
优选地，所述接收模块为串行接口电路。
优选地，所述电子开关为三极管；所述电流驱动模块为运算放大器，所述运算放大器的正向输入端分别与所述脉宽调制信号产生模块的输出端和数模转换模块的输出端连接，反向输入端与所述三极管的发射极连接，输出端与所述三极管的基极连接。
优选地，所述背光源调节电路还包括模数转换模块，所述模数转换模块的输入端与所述三极管的集电极连接，并根据模数转换模块的输入端检测的电压输出控制信号控制背光源的工作状态。
优选地，所述背光源调节电路为集成电路。
本发明通过设置数模转换模块改变输入至电流驱动模块的输入电压，从而调整输入背光源的驱动电流。由于本发明提供的背光源调节电路可适用与不同驱动电流的背光源，从而实现对多种LED背光方案进行整合收敛，因此，本发明提供的背光源调节电路，提高了电路应用的范围，缩短了研发的周期。
附图说明
图1为本发明背光源调节电路第一实施例的电路结构示意图；
图2为本发明背光源调节电路第二实施例的电路结构示意图。
本发明目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
本发明提供一种背光源调节电路。
参照图1，图1为本发明背光源调节电路第一实施例的电路结构示意图；图2为本发明背光源调节电路第二实施例的电路结构示意图。本实施例中提供的背光源调节电路包括脉宽调制信号产生模块10、数模转换模块20和电流驱动模块30；
脉宽调制信号产生模块10用于产生脉宽调制信号至所述电流驱动模块30；
所述数模转换模块20接收用户输入的操作指令，并根据用户输入的操作指令输出预置电压至所述电流驱动模块30；
所述电流驱动模块30接收所述脉宽调制信号，并根据所述预置电压对所述脉宽调制信号进行放大后输出至用于控制背光源开启/关闭的电子开关K，以控制所述背光源的开启/关闭。
本实施例中，上述脉宽调制信号产生模块10可以设置为集成电路，上述数模转换模块20和电流驱动模块30为该集成电路的外围电路，如图2所示，图2中的B区域为集成电路区域；也可将数模转换模块20和电流驱动模块30同时集成到MCU当中，形成一集成电路，如图1所示，图1中的集成电路的区域为A区域；同时还可将脉宽调制信号产生模块10、数模转换模块20和电流驱动模块30以单独的电路结构形式设置在印制电路板上。
上述数模转换模块20输出电压的大小可根据实际需要进行选择，例如可提供一操作界面供用户进行参数设置，当用户输入一电流数据后，首先由数模转换模块20根据用户的输入分析需要输出至电流驱动模块30的预置电压，然后根据该预置电压调整数模转换模块20输出至电流驱动模块30的电压。
本发明通过设置数模转换模块20改变输入至电流驱动模块30的输入电压，从而调整输入背光源的驱动电流。由于本发明提供的背光源调节电路可适用与不同驱动电流的背光源，从而实现对多种LED背光方案进行整合收敛，因此，本发明提供的背光源调节电路，提高了电路应用的范围，缩短了研发的周期。
进一步地，基于上述实施例，本实施例中，所述背光源调节电路还包括接收模块40、储存模块50和控制模块60，其中，
所述接收模块40用于接收背光源开启数据和背光源关闭数据；
所述储存模块50用于储存所述背光源开启数据和背光源关闭数据；
所述控制模块60根据所述背光源开启数据控制所述脉宽调制信号产生模块输出高电平的时间，根据背光源关闭数据控制所述脉宽调制信号产生模块输出低电平的时间。
具体地，上述背光源开启数据和背光源关闭数据储存的方式可根据实际需要进行设置，本实施例中，优选地可对背光源开启数据和背光源关闭数据分开单独储存。在本实施例中，上述储存模块50包括用于储存所述背光源关闭数据的第一储存单元51和用于储存所述背光源开启数据的第二储存单元52。上述接收模块40的电路结构可根据实际需要进行设置，只要能够接收TFT-LCD的主控IC（Timing control）输出的背光源开启数据（Duty Data）和背光源关闭数据（Delay Data）即可，本实施例中该接收模块40优选为串行接口电路。
本实施例中，当接收模块40接收到Timing control输出的背光源开启数据和背光源关闭数据时，将背光源关闭数据输出至第一储存单元51进行储存，将背光源开启数据输出至第二储存单元52进行储存。然后由控制模块60读取第一储存单元51内储存的背光源关闭数据和第二储存单元52内储存的背光源开启数据，并将该数据转换成的时间。具体地，控制模块60将背光源关闭数据转换为背光源关闭的时间（应当说明的该背光源关闭时间为在一个显示周期内从画面输入到显示需要延长的时间），将背光源开启数据转换为背光源开启的时间。首先在画面显示同步信号Vsync的触发点时（该触发点为一上升沿触发信号），由控制模块60控制脉宽调制信号产生模块10输出一时间长度为背光源关闭的时间的低电平，然后翻转输出时间长度为背光源开启的时间的高电平后控制脉宽调制信号产生模块10输出低电平。从而完成一个周期的显示，当下一周期的触发点到来时，反复执行上述操作。
进一步地，基于上述实施例，本实施例中，所述控制模块60包括第一计数器61和第二计数器62；
所述第一计数器61读取所述第一储存单元51存储的背光源关闭数据，并在画面显示同步信号Vsync的触发点，所述第一计数器61输出第一控制信号至所述脉宽调制信号产生模块10；所述脉宽调制信号产生模块10根据所述第一控制信号输出低电平；当所述第一计数器61的计数值等于所述背光源关闭数据的数值时，输出第二控制信号至所述脉宽调制信号产生模块10和所述第二计数器62，以控制所述第二计数器62开始计时，控制所述脉宽调制信号产生模块10输出高电平；当所述第二计数器62的计数值等于所述背光源开启数据的数值时，输出第三控制信号至所述脉宽调制信号产生模块10，所述脉宽调制信号产生模块10根据所述第三控制信号输出低电平。
本实施例中，上述背光源关闭数据的数值和背光源开启数据的数值由Timing control通过内部预置的算法计算得到的。例如背光源关闭数据的数值为50、背光源开启数据的数值为100时，则通过第一计数器61接收画面显示同步信号Vsync，并在画面显示同步信号Vsync的触发点到达时，第一计数器61开始计数，且第一计数器61输出第一控制信号控制脉宽调制信号产生模块10输出一低电平；当第一计数器61的计数值为50时，则输出第二控制信号至控制脉宽调制信号产生模块10输出高电平，控制第二计数器62开始计数；并当第二计数器62的计数值为100时，则由第二计数器62输出第三控制信号控制脉宽调制信号产生模块10输出低电平。从而完成一个周期的显示，当下一周期的触发点到来时，反复执行上述操作。
具体地，基于上述实施例，本实施例中，上述电子开关K为三极管；上述电流驱动模块30为运算放大器，所述运算放大器的正向输入端分别与所述脉宽调制信号产生模块10的输出端和数模转换模块20的输出端连接，反向输入端与所述三极管的发射极连接，输出端与所述三极管的基极连接。
本实施例中，上述三极管为NPN三极管，其发射极通过一电阻R接地，集电极与背光源连接。
进一步地，基于上述实施例，本实施例中，上述背光源调节电路还包括模数转换模块70，所述模数转换模块70的输入端与所述三极管的集电极连接，并根据模数转换模块70的输入端检测的电压分析背光源工作的状态。
本实施例中，通过设置一模数转换模块70对三极管的集电极的电压进行检测，从而可根据三极管的集电极的电压分析背光源是否正常工作，当背光源出现Open lamp protect（LED 开路）和LED short protect（LED短路）现象时，输出相应的控制信号至保护电路，从而实现LED 开路保护和LED短路保护。
应当说明的是，本实施例中，为了缩短开发周期和降低电路设计的难度，本实施例中，优选地可将上述背光源调节电路设置为集成电路。本实施例中，相对与现有技术中用于输出脉宽调制信号的MCU而言，提高了芯片的集成度。
本发明还提供一种液晶显示装置，该液晶显示装置包括背光源调节电路，该背光源调节电路的结构可参照上述实施例，在此不再赘述。理所应当地，由于本实施例的液晶显示装置采用了上述背光源调节电路的技术方案，因此该液晶显示装置具有上述背光源调节电路所有的有益效果。
以上仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (16)

  1. 一种背光源调节电路，其中包括脉宽调制信号产生模块、数模转换模块和电流驱动模块；
    　　　脉宽调制信号产生模块用于产生脉宽调制信号至所述电流驱动模块；
    　　　所述数模转换模块接收用户输入的操作指令，并根据用户输入的操作指令输出预置电压至所述电流驱动模块；
    　　　所述电流驱动模块接收所述脉宽调制信号，并根据所述预置电压对所述脉宽调制信号进行放大后输出至用于控制背光源开启/关闭的电子开关，以控制所述背光源的开启/关闭。
  2. 如权利要求1所述的背光源调节电路，其中所述背光源调节电路还包括接收模块、储存模块和控制模块，其中，
    　　　所述接收模块用于接收背光源开启数据和背光源关闭数据；
    　　　所述储存模块用于储存所述背光源开启数据和背光源关闭数据；
    　　　所述控制模块根据所述背光源开启数据控制所述脉宽调制信号产生模块输出高电平的时间，根据背光源关闭数据控制所述脉宽调制信号产生模块输出低电平的时间。
  3. 如权利要求2所述的背光源调节电路，其中所述储存模块包括用于储存所述背光源关闭数据的第一储存单元和用于储存所述背光源开启数据的第二储存单元。
  4. 如权利要求3所述的背光源调节电路，其中所述控制模块包括第一计数器和第二计数器；
    　　　所述第一计数器读取所述第一储存单元存储的背光源关闭数据，并在画面显示同步信号的触发点，所述第一计数器输出第一控制信号至所述脉宽调制信号产生模块；所述脉宽调制信号产生模块根据所述第一控制信号输出低电平；当所述第一计数器的计数值等于所述背光源关闭数据的数值时，输出第二控制信号至所述脉宽调制信号产生模块和所述第二计数器，以控制所述第二计数器开始计时，控制所述脉宽调制信号产生模块输出高电平；当所述第二计数器的计数值等于所述背光源开启数据的数值时，输出第三控制信号至所述脉宽调制信号产生模块，所述脉宽调制信号产生模块根据所述第三控制信号输出低电平。
  5. 如权利要求2所述的背光源调节电路，其中所述接收模块为串行接口电路。
  6. 如权利要求1所述的背光源调节电路，其中所述电子开关为三极管；所述电流驱动模块为运算放大器，所述运算放大器的正向输入端分别与所述脉宽调制信号产生模块的输出端和数模转换模块的输出端连接，反向输入端与所述三极管的发射极连接，输出端与所述三极管的基极连接。
  7. 如权利要求6所述的背光源调节电路，其中所述背光源调节电路还包括模数转换模块，所述模数转换模块的输入端与所述三极管的集电极连接，并根据模数转换模块的输入端检测的电压输出控制信号控制背光源的工作状态。
  8. 如权利要求1所述的背光源调节电路，其中所述背光源调节电路为集成电路。
  9. 一种液晶显示装置，其中所述液晶显示装置包括背光源调节电路，所述背光源调节电路包括脉宽调制信号产生模块、数模转换模块和电流驱动模块；
    　　　脉宽调制信号产生模块用于产生脉宽调制信号至所述电流驱动模块；
    　　　所述数模转换模块接收用户输入的操作指令，并根据用户输入的操作指令输出预置电压至所述电流驱动模块；
    　　　所述电流驱动模块接收所述脉宽调制信号，并根据所述预置电压对所述脉宽调制信号进行放大后输出至用于控制背光源开启/关闭的电子开关，以控制所述背光源的开启/关闭。
  10. 如权利要求9所述的液晶显示装置，其中所述背光源调节电路还包括接收模块、储存模块和控制模块，其中，
    　　　所述接收模块用于接收背光源开启数据和背光源关闭数据；
    　　　所述储存模块用于储存所述背光源开启数据和背光源关闭数据；
    　　　所述控制模块根据所述背光源开启数据控制所述脉宽调制信号产生模块输出高电平的时间，根据背光源关闭数据控制所述脉宽调制信号产生模块输出低电平的时间。
  11. 如权利要求10所述的液晶显示装置，其中所述储存模块包括用于储存所述背光源关闭数据的第一储存单元和用于储存所述背光源开启数据的第二储存单元。
  12. 如权利要求11所述的液晶显示装置，其中所述控制模块包括第一计数器和第二计数器；
    　　　所述第一计数器读取所述第一储存单元存储的背光源关闭数据，并在画面显示同步信号的触发点，所述第一计数器输出第一控制信号至所述脉宽调制信号产生模块；所述脉宽调制信号产生模块根据所述第一控制信号输出低电平；当所述第一计数器的计数值等于所述背光源关闭数据的数值时，输出第二控制信号至所述脉宽调制信号产生模块和所述第二计数器，以控制所述第二计数器开始计时，控制所述脉宽调制信号产生模块输出高电平；当所述第二计数器的计数值等于所述背光源开启数据的数值时，输出第三控制信号至所述脉宽调制信号产生模块，所述脉宽调制信号产生模块根据所述第三控制信号输出低电平。
  13. 如权利要求10所述的液晶显示装置，其中所述接收模块为串行接口电路。
  14. 如权利要求9所述的液晶显示装置，其中所述电子开关为三极管；所述电流驱动模块为运算放大器，所述运算放大器的正向输入端分别与所述脉宽调制信号产生模块的输出端和数模转换模块的输出端连接，反向输入端与所述三极管的发射极连接，输出端与所述三极管的基极连接。
  15. 如权利要求14所述的液晶显示装置，其中所述背光源调节电路还包括模数转换模块，所述模数转换模块的输入端与所述三极管的集电极连接，并根据模数转换模块的输入端检测的电压输出控制信号控制背光源的工作状态。
  16. 如权利要求9所述的液晶显示装置，其中所述背光源调节电路为集成电路。
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