WO2016074340A1 - 背光单元及其驱动方法、液晶显示装置 - Google Patents

背光单元及其驱动方法、液晶显示装置 Download PDF

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Publication number
WO2016074340A1
WO2016074340A1 PCT/CN2015/070306 CN2015070306W WO2016074340A1 WO 2016074340 A1 WO2016074340 A1 WO 2016074340A1 CN 2015070306 W CN2015070306 W CN 2015070306W WO 2016074340 A1 WO2016074340 A1 WO 2016074340A1
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Prior art keywords
period
backlight
signal
frame frequency
frequency signal
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PCT/CN2015/070306
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English (en)
French (fr)
Inventor
陈辛洪
陈宥烨
张裕桦
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深圳市华星光电技术有限公司
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Application filed by 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to DE112015005096.5T priority Critical patent/DE112015005096T5/de
Priority to RU2017116635A priority patent/RU2675047C2/ru
Priority to US14/422,663 priority patent/US20160358561A1/en
Priority to JP2017525021A priority patent/JP6419334B2/ja
Priority to KR1020177015692A priority patent/KR101980028B1/ko
Priority to GB1707382.6A priority patent/GB2546700B/en
Publication of WO2016074340A1 publication Critical patent/WO2016074340A1/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
    • G09G3/36—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
    • 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
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0237—Switching ON and OFF the backlight within one frame
    • 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

Definitions

  • the present invention relates to the field of liquid crystal display technologies, and in particular, to a backlight unit and a driving method thereof, and to a liquid crystal display device including the backlight unit.
  • the liquid crystal display is a flat ultra-thin display device consisting of a certain number of color or black-and-white pixels placed in front of a light source or a reflective surface. LCD monitors have low power consumption and are characterized by high image quality, small size, and light weight. Therefore, they are favored by everyone and become the mainstream of displays.
  • the liquid crystal display generally includes a liquid crystal panel and a backlight unit. The liquid crystal panel is disposed opposite to the backlight unit, and the backlight unit provides a display light source to the liquid crystal panel to display the image on the liquid crystal panel.
  • Some existing liquid crystal displays use a driving signal synchronized with a frame frequency signal (Vsync) to drive the backlight unit.
  • the frame signal signal (Vsync) takes a frequency of 100 hz and a period of 10 ms as an example.
  • the duty ratio (Duty) for controlling the backlight unit on time on is the same.
  • the above control method is to set a fixed duty ratio in advance when the frequency of the frame frequency signal does not change.
  • the frequency of the frame frequency signal changes. For example, as shown in the driving signal waveform diagram shown in FIG.
  • the frame frequency signal is normal in the first frame F1, and its frequency is 100 hz, and the period is 10 ms; when the second frame F2 changes, the frequency is 137 hz, and the period is It is 7.3ms; the frequency of F3 in the third frame is 116hz, the period is 8.6ms; the frequency of F4 and F5 in the 4th and 5th frames is 137hz, the period is 7.3ms; the 6th and 7th frames F6 and F7 become normal, and The frequency is 100hz and the period is 10ms.
  • the backlight unit is turned on.
  • the frame frequency signal is not changed when the driving signal PWM of the backlight unit is set, one cycle of the driving signal PWM continues until after F3 starts, for F2, The backlight unit has an overflow condition, and for F3, the backlight unit provides insufficient light source. The same situation occurs between F4 and F5 until F6 and F7 return to normal.
  • the existing backlight When the frame driving signal is abruptly changed, the duty ratio of the backlight unit on-time is inconsistent with the preset duty ratio in the corresponding frame picture, which affects the display quality of the liquid crystal panel. .
  • the present invention provides a backlight unit and a driving method thereof, the driving signal of the backlight unit and a frame frequency signal, and when the frame frequency signal is abrupt, the driving signal of the backlight unit also corresponds to In the corresponding frame picture, the duty ratio of the backlight unit on time is consistent with the preset duty ratio, which ensures the display quality of the liquid crystal panel.
  • a backlight unit comprising:
  • a backlight module including a light source for emitting light
  • a voltage generating unit configured to provide a driving voltage to the backlight module
  • a backlight control unit receives a frame frequency signal and generates a period control signal according to the frame frequency signal, the period control signal having the same period as the frame frequency signal;
  • a backlight driving chip according to the periodic control signal and a preset duty ratio D, generating a pulse width modulated PWM signal, the PWM signal having the same period as the periodic control signal, and in each cycle,
  • the duty ratio of the PWM signal is D; the PWM signal is used to control the voltage generating unit to supply or cut off a driving voltage to the backlight module.
  • the backlight control unit includes an MCU chip, and the MCU chip receives a frame frequency signal and generates the periodic control signal.
  • the MCU chip captures a rising edge of the current frame frequency signal, determines a period of the current frame frequency signal, and generates a real-time periodic control signal according to a period of the current frame frequency signal, the period of the real-time periodic control signal and the current frame The period of the frequency signal is the same.
  • the backlight module further includes a laminated reflector, a light guide plate, and an optical film set.
  • the light source is disposed opposite to the light guide plate, and light emitted by the light source is transmitted into the light guide plate.
  • the light source comprises an LED light string having a plurality of LED lights.
  • Another aspect of the present invention is to provide a driving method of a backlight unit, the backlight unit including a backlight module having a light source and a voltage generating unit for supplying a driving voltage to the backlight module, wherein the method comprises the steps of:
  • Driving by the backlight, a pulse width modulated PWM signal according to the periodic control signal and a preset duty ratio D, the PWM signal having the same period as the periodic control signal, and in each period
  • the duty ratio of the PWM signal is D; the PWM signal is used to control the voltage generating unit to supply or cut off a driving voltage to the backlight module.
  • the backlight control unit includes an MCU chip, and the MCU chip receives a frame frequency signal and generates the periodic control signal.
  • the MCU chip captures a rising edge of the current frame frequency signal, determines a period of the current frame frequency signal, and generates a real-time periodic control signal according to a period of the current frame frequency signal, the period of the real-time periodic control signal and the current frame The period of the frequency signal is the same.
  • the backlight module further includes a laminated reflector, a light guide plate, and an optical film set.
  • the light source is disposed opposite to the light guide plate, and light emitted by the light source is transmitted into the light guide plate.
  • the present invention also provides a liquid crystal display device, comprising:
  • liquid crystal panel including a plurality of pixel units
  • a source driver for providing a data signal to the pixel unit
  • a gate driver for providing a scan signal to the pixel unit
  • a backlight unit as described above, for providing a display light source to the liquid crystal panel
  • timing controller that receives image data and generates control signals for controlling the source driver and the gate driver; the timing controller also generates a frame frequency signal for providing to a backlight control unit in the backlight unit.
  • the backlight unit and the driving method thereof are provided by the embodiment of the present invention, the driving signal of the backlight unit and the frame frequency signal, and when the frame frequency signal is abrupt, the driving signal of the backlight unit also changes correspondingly, in the corresponding frame picture,
  • the duty ratio of the backlight unit on-time is the same as the preset duty ratio, which ensures the display quality of the liquid crystal panel.
  • FIG. 1 is a waveform diagram of a backlight unit driving signal when a frame frequency signal is normal in the prior art.
  • FIG. 2 is a waveform diagram of a backlight unit driving signal when a frame frequency signal is abnormal in the prior art.
  • FIG. 3 is a schematic structural diagram of a liquid crystal display device according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a backlight unit according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a backlight module according to an embodiment of the present invention.
  • FIG. 6 is a waveform diagram of a backlight unit driving signal when a frame frequency signal is abnormal in the embodiment of the present invention.
  • the liquid crystal display device includes a liquid crystal panel 1, a gate driver 2, a source driver 3, a backlight unit 4, and a timing controller 5 having a plurality of pixel units 11.
  • the timing controller 5 receives image data and generates control signals for controlling the source driver 3 and the gate driver 2.
  • the timing controller 5 controls the source driver 3 to supply a data signal to the pixel unit 11, and the timing controller 5 controls the gate driver 2 to supply a scan signal to the pixel unit 11.
  • the timing controller further generates a frame frequency signal Vsync to be supplied to the backlight unit 4, and the backlight unit 4 drives according to the frame frequency signal Vsync to generate a display light source to be supplied to the liquid crystal panel 1 to cause the liquid crystal panel 1 to display an image.
  • the backlight unit 4 provided in this embodiment includes a backlight module 41 , a backlight control unit 42 , a backlight driving chip 43 , and a voltage generating unit 44 .
  • the backlight module 41 includes a light source 411 for emitting light; the voltage generating unit 44 is configured to supply a driving voltage to the backlight module 41; the backlight control unit 42 receives the frame frequency signal Vsync and generates a period control signal St according to the frame frequency signal Vsync.
  • the period control signal St has the same period as the frame frequency signal Vsync; the backlight driving chip 43 generates a pulse width modulated PWM signal according to the period control signal St and the preset duty ratio D, the PWM signal Having the same period as the period control signal St, and the duty ratio of the PWM signal is D in each period; the PWM signal is used to control the voltage generating unit 44 to provide the backlight module 41 Or cut off the drive voltage Vd.
  • the backlight control unit 42 includes an MCU (Micro Controller Unit) chip 421, and the frame frequency signal Vsync is received by the MCU chip 421 and the period control signal St is generated.
  • the MCU chip 421 captures a rising edge of the current frame frequency signal Vsync, determines a period of the current frame frequency signal Vsync, and generates a real-time periodic control signal St according to a period of the current frame frequency signal Vsync, the real-time periodic control signal The period of St is the same as the period of the current frame frequency signal Vsync.
  • the backlight module 41 further includes a reflective reflector 412 , a light guide plate 413 , and an optical film set 414 .
  • the light source 411 is disposed opposite to the light guide plate 412, and the light emitted by the light source 411 is transmitted to the light guide plate 413.
  • the light source 411 may be an LED light string including a plurality of LED lamps.
  • the driving method of the backlight unit 4 as described above is performed in the following manner:
  • the frame frequency signal Vsync from the timing controller 5 is received by the backlight control unit 42, and the cycle control signal St is generated based on the frame frequency signal Vsync.
  • the driving voltage is supplied to the backlight module 41 by the voltage generating unit 44 by the PWM signal, so that the duty ratio of the backlight module 41 is controlled to be a preset duty ratio D by the user.
  • the period Tm of the corresponding real-time period control signal St also changes correspondingly, corresponding to the PWM signal of the current frame.
  • the duty ratio is the duty ratio D preset by the user.
  • the frame frequency signal Vsync is normal in the first frame F1, the frequency is 100hz, the period is 10ms; in the second frame F2 The frequency is 137hz, the period is 7.3ms; the frequency of F3 in the third frame is 116hz, the period is 8.6ms; the frequency of F4 and F5 in the 4th and 5th frames is 137hz, the period is 7.3ms; the 6th and 7th frames F6 and F7 become normal, with a frequency of 100hz and a period of 10ms.
  • the frame frequency signal Vsync is abnormal at the 2nd-5th frame, and its period Ti is 7.3ms, 8.6ms, 7.3ms, and 7.3ms, respectively, and the period Tm of the corresponding period control signal St and the period Tn of the PWM signal also change accordingly.
  • the on-time of the backlight module 41 is controlled according to the preset duty ratio D of the user, so that the backlight module 41 is turned on in the frame screen in which the frame frequency signal Vsync is abnormal.
  • the duty cycle of time is always kept at D.
  • the backlight unit and the driving method thereof are provided by the embodiment of the present invention, the driving signal of the backlight unit and the frame frequency signal, and when the frame frequency signal is abrupt, the driving signal of the backlight unit also changes correspondingly.
  • the duty ratio of the backlight unit on time is consistent with the preset duty ratio, which ensures the display quality of the liquid crystal panel.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Planar Illumination Modules (AREA)

Abstract

一种背光单元（4）及其驱动方法、液晶显示装置。背光单元（4）包括：背光模块（41），包括用于发光的光源（411）；电压生成单元（44），用于向背光模块（4）提供驱动电压；背光控制单元（42），接收帧频率信号（Vsync）并根据帧频率信号（Vsync）产生周期控制信号（St），周期控制信号（St）具有与帧频率信号（Vsync）相同的周期；背光驱动芯片（43），根据周期控制信号（St）以及预先设定的占空比D，产生脉宽调制PWM信号，PWM信号具有与周期控制信号相同的周期，并且在每一周期内PWM信号的占空比均为D；PWM信号用于控制电压生成单元（44）向背光模块（4）提供或切断驱动电压（Vd）。

Description

背光单元及其驱动方法、液晶显示装置 技术领域
本发明涉及液晶显示器技术领域,尤其涉及一种背光单元及其驱动方法，还涉及包含该背光单元的液晶显示装置。
背景技术
液晶显示器(Liquid Crystal Display，LCD)，为平面超薄的显示设备，它由一定数量的彩色或黑白像素组成，放置于光源或者反射面前方。液晶显示器功耗很低，并且具有高画质、体积小、重量轻的特点，因此倍受大家青睐，成为显示器的主流。液晶显示器一般包括液晶面板及背光单元，液晶面板与背光单元相对设置，由背光单元提供显示光源给液晶面板，以使液晶面板显示影像。
现有的一些液晶显示器，采用与帧频率信号(Vsync)同步的驱动信号开驱动背光单元。如图1所示的驱动信号波形图，帧频率信号(Vsync)以频率为100hz、周期为10ms为例，当背光单元的驱动信号PWM同步到该帧频率信号之后，在每一帧画面内，控制背光单元开启时间on的占空比(Duty)相同。通过优化背光单元开启时间的占空比,控制液晶面板的亮度，达到提高显示品质以及节能的目的。
以上的控制方式是基于帧频率信号的频率不发生变化的情况下预先设置固定的占空比。但是，在一些特殊的情况下，例如，在切换频道、切换2D/3D模式或切换讯号源时，帧频率信号的频率会发生变化。例如，如图2所示的驱动信号波形图，帧频率信号在第1帧F1时为正常情况，其频率为100hz、周期为10ms；在第2帧F2时发生变化，其频率为137hz、周期为7.3ms；第3帧F3的频率为116hz、周期为8.6ms；第4、5帧F4和F5的频率为137hz、周期为7.3ms；第6、7帧F6和F7变为正常情况，其频率为100hz、周期为10ms。在F2开始时，背光单元开启，由于在设置背光单元的驱动信号PWM时并未考虑帧频率信号发生变化的情况，驱动信号PWM的一个周期一直持续到在F3开始之后，对于F2来说，该背光单元出现了溢满(Overflow)的情况，而对于F3来说，背光单元提供的光源又不足。同样的情形出现在F4和F5之间，直到F6和F7才恢复正常。如上所述，现有的背光单 元驱动信号与帧频率信号同步的方式，在帧频率信号发生突变时，在相应帧画面内，背光单元开启时间的占空比与预先设定的占空比不一致，影响了液晶面板的显示品质。
发明内容
鉴于现有技术存在的不足，本发明提供了一种背光单元及其驱动方法，该背光单元的驱动信号与帧频率信号，并且在帧频率信号发生突变时，背光单元的驱动信号也发生相应的变化，在相应帧画面内，背光单元开启时间的占空比与预先设定的占空比一致，保证了液晶面板的显示品质。
为了实现上述目的，本发明采用了如下的技术方案：
一种背光单元，其中，包括：
背光模块，包括用于发光的光源；
电压生成单元，用于向所述背光模块提供驱动电压；
背光控制单元，接收帧频率信号并根据该帧频率信号产生一周期控制信号，所述周期控制信号具有与所述帧频率信号相同的周期；
背光驱动芯片，根据所述周期控制信号以及预先设定的占空比D，产生一脉宽调制PWM信号，所述PWM信号具有与所述周期控制信号相同的周期，并且在每一周期内，该PWM信号的占空比均为D；所述PWM信号用于控制所述电压生成单元向所述背光模块提供或切断驱动电压。
其中，所述背光控制单元包括MCU芯片，由所述MCU芯片接收帧频率信号并产生所述周期控制信号。
其中，所述MCU芯片捕捉当前帧频率信号的上升沿，确定当前帧频率信号的周期，并根据当前帧频率信号的周期产生一实时周期控制信号，所述实时周期控制信号的周期与据当前帧频率信号的周期相同。
其中，所述背光模块还包括叠层设置的反光板、导光板以及光学膜片组，所述光源与所述导光板相对设置，光源发出的光传输到所述导光板中。
其中，所述光源包括具有多个LED灯的LED灯串。
本发明的另一方面是提供一种背光单元的驱动方法，所述背光单元包括具 有光源的背光模块以及向所述背光模块提供驱动电压的电压生成单元，其中，该方法包括步骤：
由背光控制单元接收帧频率信号并根据该帧频率信号产生一周期控制信号，所述周期控制信号具有与所述帧频率信号相同的周期；
由背光驱动芯片，根据所述周期控制信号以及预先设定的占空比D，产生一脉宽调制PWM信号，所述PWM信号具有与所述周期控制信号相同的周期，并且在每一周期内，该PWM信号的占空比均为D；所述PWM信号用于控制所述电压生成单元向所述背光模块提供或切断驱动电压。
其中，所述背光控制单元包括MCU芯片，由所述MCU芯片接收帧频率信号并产生所述周期控制信号。
其中，所述MCU芯片捕捉当前帧频率信号的上升沿，确定当前帧频率信号的周期，并根据当前帧频率信号的周期产生一实时周期控制信号，所述实时周期控制信号的周期与据当前帧频率信号的周期相同。
其中，所述背光模块还包括叠层设置的反光板、导光板以及光学膜片组，所述光源与所述导光板相对设置，光源发出的光传输到所述导光板中。
本发明还提供了一种液晶显示装置，其中，包括：
包括多个像素单元的液晶面板；
源驱动器，用于向所述像素单元提供数据信号；
栅驱动器，用于向所述像素单元提供扫描信号；
如上所述的背光单元，用于向所述液晶面板提供显示光源；
时序控制器，接收图像数据并产生用于控制所述源驱动器和栅驱动器的控制信号；所述时序控制器还产生帧频率信号提供给所述背光单元中的背光控制单元。
本发明实施例提供的背光单元及其驱动方法，该背光单元的驱动信号与帧频率信号，并且在帧频率信号发生突变时，背光单元的驱动信号也发生相应的变化，在相应帧画面内，背光单元开启时间的占空比与预先设定的占空比一致，保证了液晶面板的显示品质。
附图说明
图1是现有技术中帧频率信号正常时背光单元驱动信号的波形图。
图2是现有技术中帧频率信号异常时背光单元驱动信号的波形图。
图3是本发明实施例提供的液晶显示装置的结构示意图。
图4是本发明实施例提供的背光单元的结构示意图。
图5是本发明实施例提供的背光模块的结构示意图。
图6是本发明实施例中帧频率信号异常时背光单元驱动信号的波形图。
具体实施方式
为了使本发明的目的、技术方案以及优点更加清楚明白，下面将结合附图用实施例对本发明做进一步说明。
如图3所示，本实施例提供的液晶显示装置包括具有多个像素单元11的液晶面板1、栅驱动器2、源驱动器3、背光单元4以及时序控制器5。
其中，时序控制器5接收图像数据并产生用于控制所述源驱动器3和栅驱动器2的控制信号。时序控制器5控制所述源驱动器3向所述像素单元11提供数据信号，时序控制器5控制所述栅驱动器2向所述像素单元11提供扫描信号。进一步地，时序控制器还产生帧频率信号Vsync提供给背光单元4，背光单元4根据该帧频率信号Vsync进行驱动，产生显示光源提供给液晶面板1，以使液晶面板1显示图像。
其中，参阅图4和图5，本实施例中提供的背光单元4包括背光模块41、背光控制单元42、背光驱动芯片43以及电压生成单元44。背光模块41包括有用于发光的光源411；电压生成单元44用于向所述背光模块41提供驱动电压；背光控制单元42接收帧频率信号Vsync并根据该帧频率信号Vsync产生周期控制信号St，所述周期控制信号St具有与所述帧频率信号Vsync相同的周期；背光驱动芯片43根据所述周期控制信号St以及预先设定的占空比D，产生一脉宽调制PWM信号，所述PWM信号具有与所述周期控制信号St相同的周期，并且在每一周期内，该PWM信号的占空比均为D；所述PWM信号用于控制所述电压生成单元44向所述背光模块41提供或切断驱动电压Vd。
更进一步地，所述背光控制单元42包括MCU(Micro Controller Unit)芯片421，由所述MCU芯片421接收帧频率信号Vsync并产生所述周期控制信号St。 具体地，所述MCU芯片421捕捉当前帧频率信号Vsync的上升沿，确定当前帧频率信号Vsync的周期，并根据当前帧频率信号Vsync的周期产生一实时周期控制信号St，所述实时周期控制信号St的周期与据当前帧频率信号Vsync的周期相同。
如图5所述的，本实施例中，所述背光模块41还包括叠层设置的反光板412、导光板413以及光学膜片组414。其中，所述光源411与所述导光板412相对设置，光源411发出的光传输到所述导光板413中。具体地，所述光源411可以是包括具有多个LED灯的LED灯串。
如上所述的背光单元4的驱动方法按照以下的方式进行：
首先由背光控制单元42接收时序控制器5发出的帧频率信号Vsync，根据该帧频率信号Vsync产生周期控制信号St。主要是由背光控制单元42中的MCU芯片421接收该帧频率信号Vsync并产生所述周期控制信号St。更具体地，MCU芯片421捕捉当前帧频率信号Vsync的上升沿，确定当前帧频率信号Vsync的周期Ti，并根据当前帧频率信号Vsync的周期Ti产生一实时周期控制信号St，所述实时周期控制信号St的周期为Tm。其中Tm＝Ti。
然后由背光驱动芯片43根据所述周期控制信号St以及用户预先设定的占空比D，产生一脉宽调制PWM信号，所述PWM信号的周期为Tn。其中Tn＝Tm。并且该PWM信号在每一周期内，其占空比均为D。
最后在由所述PWM信号控制所述电压生成单元44向所述背光模块41提供或切断驱动电压，从而控制背光模块41开启时间的占空比为用户预先设定的占空比D。
在如上的驱动方式中，若当前帧频率信号Vsync的周期Ti相对于前一帧的周期发生变化时，对应的实时周期控制信号St的周期Tm也相应地发生变化，对应当前帧的PWM信号的周期Tn也相应地发生变化。即，对于任意一帧画面，总是保持Tn＝Tm＝Ti。由于PWM信号是直接同步到周期控制信号St，周期控制信号St又是随着频率信号Vsync的变化而变化，因此，在帧频率信号Vsync发生突变时，PWM信号还是可以控制背光模块41开启时间的占空比为用户预先设定的占空比D。
最为一个具体的例子，如图6所示的驱动信号波形图，帧频率信号Vsync在第1帧F1时为正常情况，其频率为100hz、周期为10ms；在第2帧F2时发 生变化，其频率为137hz、周期为7.3ms；第3帧F3的频率为116hz、周期为8.6ms；第4、5帧F4和F5的频率为137hz、周期为7.3ms；第6、7帧F6和F7变为正常情况，其频率为100hz、周期为10ms。帧频率信号Vsync在第2-5帧时发生异常，其周期Ti分别为7.3ms、8.6ms、7.3ms和7.3ms，相对应的周期控制信号St的周期Tm和PWM信号的周期Tn也相应变化为7.3ms、8.6ms、7.3ms和7.3ms，根据用户预先设定的占空比D，控制背光模块41的开启on时间,使得帧频率信号Vsync发生异常的帧画面内，背光模块41的开启时间的占空比总是保持为D。
综上所述，本发明实施例提供的背光单元及其驱动方法，该背光单元的驱动信号与帧频率信号，并且在帧频率信号发生突变时，背光单元的驱动信号也发生相应的变化，在相应帧画面内，背光单元开启时间的占空比与预先设定的占空比一致，保证了液晶面板的显示品质。
以上所述仅是本申请的具体实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本申请原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本申请的保护范围。

Claims (18)

  1. 一种背光单元，其中，包括：
    背光模块，包括用于发光的光源；
    电压生成单元，用于向所述背光模块提供驱动电压；
    背光控制单元，接收帧频率信号并根据该帧频率信号产生一周期控制信号，所述周期控制信号具有与所述帧频率信号相同的周期；
    背光驱动芯片，根据所述周期控制信号以及预先设定的占空比D，产生一脉宽调制PWM信号，所述PWM信号具有与所述周期控制信号相同的周期，并且在每一周期内，该PWM信号的占空比均为D；所述PWM信号用于控制所述电压生成单元向所述背光模块提供或切断驱动电压。
  2. 根据权利要求1所述的背光单元，其中，所述背光控制单元包括MCU芯片，由所述MCU芯片接收帧频率信号并产生所述周期控制信号。
  3. 根据权利要求2所述的背光单元，其中，所述MCU芯片捕捉当前帧频率信号的上升沿，确定当前帧频率信号的周期，并根据当前帧频率信号的周期产生一实时周期控制信号，所述实时周期控制信号的周期与据当前帧频率信号的周期相同。
  4. 根据权利要求1所述的背光单元，其中，所述背光模块还包括叠层设置的反光板、导光板以及光学膜片组，所述光源与所述导光板相对设置，光源发出的光传输到所述导光板中。
  5. 根据权利要求4所述的背光单元，其中，所述光源包括具有多个LED灯的LED灯串。
  6. 根据权利要求3所述的背光单元，其中，所述背光模块还包括叠层设置的反光板、导光板以及光学膜片组，所述光源与所述导光板相对设置，光源发出的光传输到所述导光板中。
  7. 一种背光单元的驱动方法，所述背光单元包括具有光源的背光模块以及向所述背光模块提供驱动电压的电压生成单元，其中，该方法包括步骤：
    由背光控制单元接收帧频率信号并根据该帧频率信号产生一周期控制信 号，所述周期控制信号具有与所述帧频率信号相同的周期；
    由背光驱动芯片，根据所述周期控制信号以及预先设定的占空比D，产生一脉宽调制PWM信号，所述PWM信号具有与所述周期控制信号相同的周期，并且在每一周期内，该PWM信号的占空比均为D；所述PWM信号用于控制所述电压生成单元向所述背光模块提供或切断驱动电压。
  8. 根据权利要求7所述的驱动方法，其中，所述背光控制单元包括MCU芯片，由所述MCU芯片接收帧频率信号并产生所述周期控制信号。
  9. 根据权利要求8所述的驱动方法，其中，所述MCU芯片捕捉当前帧频率信号的上升沿，确定当前帧频率信号的周期，并根据当前帧频率信号的周期产生一实时周期控制信号，所述实时周期控制信号的周期与据当前帧频率信号的周期相同。
  10. 根据权利要求7所述的驱动方法，其中，所述背光模块还包括叠层设置的反光板、导光板以及光学膜片组，所述光源与所述导光板相对设置，光源发出的光传输到所述导光板中。
  11. 根据权利要求10所述的背光单元，其中，所述光源包括具有多个LED灯的LED灯串。
  12. 根据权利要求9所述的背光单元，其中，所述背光模块还包括叠层设置的反光板、导光板以及光学膜片组，所述光源与所述导光板相对设置，光源发出的光传输到所述导光板中。
  13. 一种液晶显示装置，其中，包括：
    包括多个像素单元的液晶面板；
    源驱动器，用于向所述像素单元提供数据信号；
    栅驱动器，用于向所述像素单元提供扫描信号；
    背光单元，用于向所述液晶面板提供显示光源；
    时序控制器，接收图像数据并产生用于控制所述源驱动器和栅驱动器的控制信号；所述时序控制器还产生帧频率信号提供给所述背光单元中的背光控制单元；其中，所述背光单元包括：
    背光模块，包括用于发光的光源；
    电压生成单元，用于向所述背光模块提供驱动电压；
    背光控制单元，接收帧频率信号并根据该帧频率信号产生一周期控制信号，所述周期控制信号具有与所述帧频率信号相同的周期；
    背光驱动芯片，根据所述周期控制信号以及预先设定的占空比D，产生一脉宽调制PWM信号，所述PWM信号具有与所述周期控制信号相同的周期，并且在每一周期内，该PWM信号的占空比均为D；所述PWM信号用于控制所述电压生成单元向所述背光模块提供或切断驱动电压。
  14. 根据权利要求13所述的液晶显示装置，其中，所述背光控制单元包括MCU芯片，由所述MCU芯片接收帧频率信号并产生所述周期控制信号。
  15. 根据权利要求14所述的液晶显示装置，其中，所述MCU芯片捕捉当前帧频率信号的上升沿，确定当前帧频率信号的周期，并根据当前帧频率信号的周期产生一实时周期控制信号，所述实时周期控制信号的周期与据当前帧频率信号的周期相同。
  16. 根据权利要求13所述的液晶显示装置，其中，所述背光模块还包括叠层设置的反光板、导光板以及光学膜片组，所述光源与所述导光板相对设置，光源发出的光传输到所述导光板中。
  17. 根据权利要求16所述的液晶显示装置，其中，所述光源包括具有多个LED灯的LED灯串。
  18. 根据权利要求15所述的液晶显示装置，其中，所述背光模块还包括叠层设置的反光板、导光板以及光学膜片组，所述光源与所述导光板相对设置，光源发出的光传输到所述导光板中。
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