WO2016187925A1 - 一种液晶驱动电路及液晶显示装置 - Google Patents

一种液晶驱动电路及液晶显示装置 Download PDF

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Publication number
WO2016187925A1
WO2016187925A1 PCT/CN2015/082739 CN2015082739W WO2016187925A1 WO 2016187925 A1 WO2016187925 A1 WO 2016187925A1 CN 2015082739 W CN2015082739 W CN 2015082739W WO 2016187925 A1 WO2016187925 A1 WO 2016187925A1
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Prior art keywords
electrical switch
liquid crystal
capacitors
capacitor
electrical
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Ceased
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PCT/CN2015/082739
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English (en)
French (fr)
Inventor
田勇
张鑫
赵莽
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Wuhan China Star Optoelectronics Technology Co Ltd
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Wuhan China Star Optoelectronics Technology Co Ltd
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Priority to US14/893,519 priority Critical patent/US20160351143A1/en
Publication of WO2016187925A1 publication Critical patent/WO2016187925A1/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
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • 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
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • 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
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/1365—Active matrix addressed cells in which the switching element is a two-electrode device
    • 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
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0443—Pixel structures with several sub-pixels for the same colour in a pixel, not specifically used to display gradations
    • G09G2300/0447—Pixel structures with several sub-pixels for the same colour in a pixel, not specifically used to display gradations for multi-domain technique to improve the viewing angle in a liquid crystal display, such as multi-vertical alignment [MVA]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0823—Several active elements per pixel in active matrix panels used to establish symmetry in driving, e.g. with polarity inversion
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0852—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor being a dynamic memory with more than one capacitor
    • 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
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
    • 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

Definitions

  • the present invention relates to the field of electronics, and in particular to a liquid crystal driving circuit and a liquid crystal display device.
  • a large-size liquid crystal display using a VA (Vertical Alignment Liquid Crystal) liquid crystal mode there is a problem that a large-view character is biased.
  • VA Very Alignment Liquid Crystal
  • the way to improve the low color shift in this way has the following problems: the primary partition and the secondary partition respectively have a common terminal voltage with different voltage values, so the common terminal voltages of the primary partition and the secondary partition cannot be consistent, resulting in liquid crystal display. The device appears to be flickering, which seriously affects the quality of the liquid crystal display device.
  • the technical problem to be solved by the present invention is to provide a liquid crystal driving circuit and a liquid crystal display circuit to maintain a common common terminal voltage of the main partition and the sub-area, thereby solving the situation in which the liquid crystal display flickers, thereby improving the quality of the liquid crystal display device.
  • the present invention provides a liquid crystal driving circuit for supplying power to a pixel unit of a liquid crystal display device.
  • the pixel unit includes a main partition and a sub-area, and the liquid crystal driving circuit includes a first electric switch, a second electric switch, and a second a three-electric switch, a fourth electrical switch, a fifth electrical switch, a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor, wherein the first and second capacitors are located in the primary partition, the third and the third Four a capacitor is located in the sub-zone, and control ends of the first to fourth electrical switches are both connected to the gate to receive a control signal, and the first end of the first switch is connected to the first and second a first end of the capacitor, a second end of the first electrical switch being coupled to the first end of the second electrical switch, and coupled to the data terminal for receiving a charging voltage, the second end of the second electrical switch Connected to a first end of the third electrical switch and connected to a first end of the third and fourth
  • the first to fourth electrical switches are transistors, and the control terminals, the first ends and the second ends of the first to fourth electrical switches are respectively a gate, a source and a drain of the transistor.
  • the fifth electrical switch is a transistor, the first end of the fifth electrical switch is a source of the transistor, and the second end of the fifth electrical switch is a drain of the transistor, the transistor The gate is connected to the source of the transistor.
  • the transistors are all NPN type transistors.
  • the fifth electrical switch is a diode, the first end of the fifth electrical switch is an anode of the diode, and the second end of the fifth electrical switch is a cathode of the diode.
  • the present invention also provides a liquid crystal display device including a pixel unit and a liquid crystal driving circuit for supplying power to the pixel unit, the pixel unit including a main partition and a sub-partition, the liquid crystal driving circuit including a first electric switch and a second An electrical switch, a third electrical switch, a fourth electrical switch, a fifth electrical switch, a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor, wherein the first and second capacitors are located in the primary partition, The third and fourth capacitors are located in the secondary partition, and the control ends of the first to fourth electrical switches are both connected to the gate to receive a control signal, and the first end of the first electrical switch is connected to the a first end of the first and second capacitors, a second end of the first electrical switch being coupled to the first end of the second electrical switch, and coupled to the data terminal for receiving a charging voltage, the second electrical a second end of the switch is connected to the third power a first end of the switch connected to the first ends of the third and fourth capacitor
  • the first to fourth electrical switches are transistors, and the control terminals, the first ends and the second ends of the first to fourth electrical switches are respectively a gate, a source and a drain of the transistor.
  • the fifth electrical switch is a transistor, the first end of the fifth electrical switch is a source of the transistor, and the second end of the fifth electrical switch is a drain of the transistor, the transistor The gate is connected to the source of the transistor.
  • the transistors are all NPN type transistors.
  • the fifth electrical switch is a diode, the first end of the fifth electrical switch is an anode of the diode, and the second end of the fifth electrical switch is a cathode of the diode.
  • a liquid crystal driving circuit for supplying power to a pixel unit of a liquid crystal display device, wherein the pixel unit includes a main partition and a sub-area, and the liquid crystal driving circuit includes a first electric switch, a second electric switch, and a third electric a switch, a fourth electrical switch, a fifth electrical switch, a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor, wherein the first and second capacitors are located in the primary partition, and the third and fourth capacitors Located in the secondary partition, the control ends of the first to fourth electrical switches are both connected to the gate terminal to receive a control signal, and the first end of the first electrical switch is connected to the first and second capacitors The first end of the first electrical switch is connected to the first end of the second electrical switch, and is connected to the data end to receive the charging voltage, and the second end of the second electrical switch is connected To the first end of the third electrical switch, and to the first ends of the third and fourth capacitors, the second end of the third electrical switch is connected to the common voltage
  • the second electrical switch and the fourth electrical switch are connected in parallel.
  • the fifth electrical switch is activated, and the charging voltage passes through the second electrical switch.
  • the fourth electrical switch and the fifth electrical switch simultaneously charge the third and fourth capacitors, and the charging capability is enhanced in the positive half cycle to increase the relative discharge capacity; and in the negative half cycle, the fifth electrical switch is turned off, only The second electrical switch charges the third and fourth capacitors, and the charge and discharge capability is unchanged.
  • the potential of the pixel unit increases in the positive half cycle of the charging voltage, and the negative half-cycle potential does not change, and the common terminal voltage in the middle of the positive period and the negative period rises, thereby the common terminal voltage of the pixel unit of the main partition. Achieving consistency, solving the situation that the liquid crystal display is flickering, thereby improving the quality of the liquid crystal display device.
  • FIG. 1 is a circuit diagram of a liquid crystal driving circuit according to a first preferred embodiment of the first aspect of the present invention
  • FIG. 2 is a circuit diagram of a liquid crystal driving circuit according to a second preferred embodiment of the first aspect of the present invention.
  • a first preferred embodiment of the first aspect of the present invention provides a liquid crystal driving circuit 100.
  • the liquid crystal driving circuit 100 is configured to supply power to a pixel unit of a liquid crystal display device.
  • Said The pixel unit includes a primary partition and a secondary partition.
  • the liquid crystal driving circuit 100 includes a first electrical switch T1, a second electrical switch T2, a third electrical switch T3, a fourth electrical switch T4, a fifth electrical switch T5, a first capacitor C1, a second capacitor C2, and a third capacitor.
  • the first and second capacitors C1 and C2 are located in the primary partition.
  • the third and fourth capacitors C3 and C4 are located in the secondary partition.
  • the control terminals of the first to fourth electrical switches T1-T4 are both connected to the gate terminal G to receive a control signal.
  • the first end of the first electrical switch T1 is coupled to the first ends of the first and second capacitors C1 and C2.
  • the second end of the first electrical switch T1 is connected to the first end of the second electrical switch T2 and is connected to the data terminal D to receive the charging voltage.
  • the second end of the second electrical switch T2 is coupled to the first end of the third electrical switch T3 and to the first ends of the third and fourth capacitors C3 and C4.
  • the second end of the third electrical switch T3 is connected to the common voltage terminal COM.
  • the second ends of the first to fourth capacitors C1-C4 are both connected to the common voltage terminal COM to receive the common terminal voltage.
  • the first end of the fourth electrical switch T4 is coupled to the data terminal D to receive the charging voltage.
  • the second end of the fourth electrical switch T4 is connected to the first end of the fifth electrical switch T5, and the second end of the fifth electrical switch T5 is connected to the third and fourth capacitors C3 and C4 First end.
  • the control signal turns on the first to fourth electrical switches T1-T4 to charge the first to fourth capacitors C1-C4, the positive half-cycle voltage signal of the voltage signal output by the data terminal D
  • the fifth electrical switch T5 is used to perform supplementary charging on the third and fourth capacitors C3 and C4, and the negative half-cycle voltage signal of the voltage signal outputted by the data terminal D is turned off to the fifth electrical switch T5 to stop the pair.
  • the third and fourth capacitors C3 and C4 are supplementally charged.
  • the positive half cycle and the negative half cycle of the charging voltage are alternately driven. If the charging voltage is greater than the common terminal voltage for a positive half cycle, the charging voltage is less than the common terminal voltage, which is a negative half cycle, and the common terminal voltage is set at the center of the positive and negative half cycles.
  • the pixel unit of the primary partition has the same charging capacity and discharging capacity in the positive period, and the pixel unit of the primary partition has the same charging capacity and discharging capacity in the negative period, and the common terminal voltage is set at the center of the positive and negative half cycles.
  • the pixel unit has a relatively weaker ability to discharge in the positive cycle and a relatively stronger charging capability in the negative cycle.
  • This asymmetry in charging capability causes the common terminal voltage of the pixel unit in the sub-partition to be lower than the common terminal voltage of the pixel unit in the main partition, and cannot be kept consistent, resulting in image flicker of the liquid crystal display device.
  • the second electrical switch T2 and the fourth electrical switch T4 are connected in parallel.
  • the fifth electrical switch T5 is activated when the charging voltage is in the positive half cycle, and the charging voltage is simultaneously passed through the second electrical switch T2, the fourth electrical switch T4, and the fifth electrical switch T5.
  • the third and fourth capacitors C3 and C4 are charged, and the charging capability is enhanced in the positive half cycle to increase the relative discharge capacity; and in the negative half cycle, the fifth electrical switch T5 is turned off, and only the second electrical switch is in the third and the third The four capacitors C3 and C4 are charged, and the charge and discharge capability is unchanged. That is, in the sub-partition, the potential of the pixel unit increases in the positive half cycle of the charging voltage, and the negative half-cycle potential does not change, and the common terminal voltage in the middle of the positive period and the negative period rises, thereby the common terminal voltage of the pixel unit of the main partition. Achieving consistency, solving the situation that the liquid crystal display is flickering, thereby improving the quality of the liquid crystal display device.
  • the first to fourth electrical switches T1-T4 are transistors.
  • the control terminal, the first terminal and the second terminal of the first to fourth electrical switches T1-T4 are respectively a gate, a source and a drain of the transistor.
  • the fifth electrical switch T5 is a transistor.
  • the first end of the fifth electrical switch T5 is the source of the transistor.
  • the second end of the fifth electrical switch T5 is the drain of the transistor, and the gate of the transistor is connected to the source of the transistor.
  • the transistors are all NPN type transistors. In other embodiments, the type of the transistor can also be adjusted according to actual needs.
  • a second preferred embodiment of the first aspect of the present invention provides a liquid crystal driving circuit 200.
  • the liquid crystal driving circuit 200 provided by the second preferred embodiment is similar to the liquid crystal driving circuit 100 provided by the first preferred embodiment, and the difference is that in the second preferred embodiment, the fifth The electric switch T51 is a diode.
  • the first end of the fifth electrical switch T51 is the anode of the diode.
  • the second end of the fifth electrical switch T51 is the cathode of the diode.
  • the fifth electrical switch T51 can also be adjusted according to actual conditions, as long as the device with the unidirectional conduction function is satisfied.
  • a second embodiment of the present invention provides a liquid crystal display device.
  • the liquid crystal display device includes a pixel unit and a liquid crystal driving circuit that supplies power to the pixel unit.
  • the pixel unit includes a primary partition and a secondary partition.
  • the liquid crystal driving circuit may be the liquid crystal driving circuit 100 provided in the first preferred embodiment of the first aspect. In other embodiments, the liquid crystal driving circuit may also be the liquid crystal driving circuit 200 provided in the second preferred embodiment of the first aspect.
  • the positive half cycle and the negative half cycle of the charging voltage are a basic requirement for driving. If the charging voltage is greater than the common terminal voltage for a positive half cycle, the charging voltage is less than the common terminal voltage, which is a negative half cycle, and the common terminal voltage is set at the center of the positive and negative half cycles.
  • the pixel unit of the primary partition has the same charging capacity and discharging capacity in the positive period, and the pixel unit of the primary partition has the same charging capacity and discharging capacity in the negative period, and the common terminal voltage is set at the center of the positive and negative half cycles.
  • the pixel unit has a relatively weaker ability to discharge in the positive cycle and a relatively stronger charging capability in the negative cycle.
  • This asymmetry in charging capability causes the common terminal voltage of the pixel unit in the sub-partition to be lower than the common terminal voltage of the pixel unit in the main partition, and cannot be kept consistent, resulting in image flicker of the liquid crystal display device.
  • the second electrical switch T2 and the fourth electrical switch T4 are connected in parallel.
  • the fifth electrical switch T5 is activated, and the charging voltage passes through the second The electric switch T2, the fourth electric switch T4 and the fifth electric switch T5 simultaneously charge the third and fourth capacitors C3 and C4, and the charging capability is enhanced in the positive half cycle to increase the relative discharge capacity; and in the negative half cycle
  • the fifth electrical switch T5 is turned off, and only the second electrical switch charges the third and fourth capacitors C3 and C4, and the charge and discharge capability does not change.
  • the potential of the pixel unit increases in the positive half cycle of the charging voltage, and the negative half-cycle potential does not change, and the common terminal voltage in the middle of the positive period and the negative period rises, thereby the common terminal voltage of the pixel unit of the main partition. Achieving consistency, solving the situation that the liquid crystal display is flickering, thereby improving the quality of the liquid crystal display device.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

一种液晶驱动电路（100）包括第一至第五电开关（T1至T5）及第一至第四电容（C1至C4），第一及第二电容（C1及C2）位于主分区，第三及第四电容(C3,C4)位于副分区，第一至第三电容(C1至C3)串联连接，第一及第二电容(C1及C2)、第三及第四电容（C3及C4）分别并联在第一及第二电开关（T1及T2）与公共电压端（COM）之间，第四及第五电开关(T4及T5)串联在数据端(D)与第二电开关(T2)之间，第一至第四电开关(T1至T4)受控于栅控端(G)，数据端(D)分别连接至第一、第二及第四电开关(T1、T2及T4)，当控制信号开启第一至第四电开关(T1至T4)时，数据端(D)输出的电压信号的正半周电压信号导通第五电开关(T5)，以对第三及第四电容(C3及C4)进行补充充电，数据端(D)输出的电压信号的负半周电压信号截止第五电开关(T5)，以停止对第三及第四电容(C3及C4)进行补充充电。本发明实现了提高了液晶显示装置的品质。本发明还提供了液晶显示装置。

Description

一种液晶驱动电路及液晶显示装置
本发明要求2015年5月28日递交的发明名称为“一种液晶驱动电路及液晶显示装置”的申请号201510281879.6的在先申请优先权，上述在先申请的内容以引入的方式并入本文本中。
技术领域
本发明涉及电子领域，尤其涉及一种液晶驱动电路及液晶显示装置。
背景技术
目前在薄膜场效应晶体管显示装置中，特别是采用VA(Vertical Alignment liquid crystal，垂直排列液晶)液晶模式的大尺寸液晶显示器，普遍存在大视角色偏的问题。为改善此问题，目前普遍做法是将一个像素单元区域分成主分区及副分区两个分区，在同一视频信号灰阶下，使主分区及副分区的电压不同。因此在主分区及副分区呈现不同的Gamma曲线。其中，所述主分区及副分区合成的Gamma曲线在大视角下与正视角差异减小，明显改善低色偏的问题。但是，采用这样方式来改善低色偏的方式存在以下问题：主分区及副分区的分别具有一个压值不同的公共端电压，因此主分区及副分区的公共端电压无法达到一致，导致液晶显示装置出现闪烁的状况，严重影响液晶显示装置的品质。
发明内容
本发明所要解决的技术问题在于提供一种液晶驱动电路及液晶显示电路，以维持主分区及副分区具有一致的公共端电压，从而解决液晶显示器出现闪烁的状况，进而提高液晶显示装置的品质。
为了实现上述目的，本发明实施方式提供如下技术方案：
本发明供了一种液晶驱动电路，用于对液晶显示装置的像素单元进行供电，所述像素单元包括主分区及副分区，所述液晶驱动电路包括第一电开关、第二电开关、第三电开关、第四电开关、第五电开关、第一电容、第二电容、第三电容及第四电容，所述第一及第二电容位于所述主分区，所述第三及第四 电容位于所述副分区，所述第一至第四电开关的控制端均连接至栅控端，以接收控制信号，所述第一电开关的第一端连接至所述第一及第二电容的第一端，所述第一电开关的第二端连接至所述第二电开关的第一端，并连接至数据端，以接收充电电压，所述第二电开关的第二端连接至所述第三电开关的第一端，并连接至所述第三及第四电容的第一端，所述第三电开关的第二端连接至公共电压端，所述第一至第四电容的第二端均连接至所述公共电压端，以接收公共端电压，所述第四电开关的第一端连接至所述数据端，以接收所述充电电压，所述第四电开关的第二端连接至所述第五电开关的第一端，所述第五电开关的第二端连接至所述第三及第四电容的第一端，当所述控制信号开启所述第一至第四电开关，来对所述第一至第四电容进行充电时，所述数据端输出的电压信号的正半周电压信号导通所述第五电开关，以对所述第三及第四电容进行补充充电，所述数据端输出的电压信号的负半周电压信号截止第五电开关，以停止对所述第三及第四电容进行补充充电。
其中，所述第一至第四电开关为晶体管，所述第一至第四电开关的控制端、第一端及第二端分别为所述晶体管的栅极、源极及漏极。
其中，所述第五电开关为晶体管，所述第五电开关的第一端为所述晶体管的源极，所述第五电开关的第二端为所述晶体管的漏极，所述晶体管的栅极连接至所述晶体管的源极。
其中，所述晶体管均为NPN型晶体管。
其中，所述第五电开关为二极管，所述第五电开关的第一端为所述二极管的阳极，所述第五电开关的第二端为所述二极管的阴极。
本发明还提供一种液晶显示装置，包括像素单元及为所述像素单元进行供电的液晶驱动电路，所述像素单元包括主分区及副分区，所述液晶驱动电路包括第一电开关、第二电开关、第三电开关、第四电开关、第五电开关、第一电容、第二电容、第三电容及第四电容，所述第一及第二电容位于所述主分区，所述第三及第四电容位于所述副分区，所述第一至第四电开关的控制端均连接至栅控端，以接收控制信号，所述第一电开关的第一端连接至所述第一及第二电容的第一端，所述第一电开关的第二端连接至所述第二电开关的第一端，并连接至数据端，以接收充电电压，所述第二电开关的第二端连接至所述第三电 开关的第一端，并连接至所述第三及第四电容的第一端，所述第三电开关的第二端连接至公共电压端，所述第一至第四电容的第二端均连接至所述公共电压端，以接收公共端电压，所述第四电开关的第一端连接至所述数据端，以接收所述充电电压，所述第四电开关的第二端连接至所述第五电开关的第一端，所述第五电开关的第二端连接至所述第三电容及所述第四电容的第一端，当所述控制信号开启所述第一至第四电开关，来对所述第一至第四电容进行充电时，所述数据端输出的电压信号的正半周电压信号导通所述第五电开关，以对所述第三及第四电容进行补充充电，所述数据端输出的电压信号的负半周电压信号截止第五电开关，以停止对所述第三及第四电容进行补充充电。
其中，所述第一至第四电开关为晶体管，所述第一至第四电开关的控制端、第一端及第二端分别为所述晶体管的栅极、源极及漏极。
其中，所述第五电开关为晶体管，所述第五电开关的第一端为所述晶体管的源极，所述第五电开关的第二端为所述晶体管的漏极，所述晶体管的栅极连接至所述晶体管的源极。
其中，所述晶体管均为NPN型晶体管。
其中，所述第五电开关为二极管，所述第五电开关的第一端为所述二极管的阳极，所述第五电开关的第二端为所述二极管的阴极。
本发明一种液晶驱动电路，用于对液晶显示装置的像素单元进行供电，所述像素单元包括主分区及副分区，所述液晶驱动电路包括第一电开关、第二电开关、第三电开关、第四电开关、第五电开关、第一电容、第二电容、第三电容及第四电容，所述第一及第二电容位于所述主分区，所述第三及第四电容位于所述副分区，所述第一至第四电开关的控制端均连接至栅控端，以接收控制信号，所述第一电开关的第一端连接至所述第一及第二电容的第一端，所述第一电开关的第二端连接至所述第二电开关的第一端，并连接至数据端，以接收充电电压，所述第二电开关的第二端连接至所述第三电开关的第一端，并连接至所述第三及第四电容的第一端，所述第三电开关的第二端连接至公共电压端，所述第一至第四电容的第二端均连接至所述公共电压端，以接收公共端电压，所述第四电开关的第一端连接至所述数据端，以接收所述充电电压，所述第四电开关的第二端连接至所述第五电开关的第一端，所述第五电开关的第二 端连接至所述第三及第四电容的第一端，当所述控制信号开启所述第一至第四电开关，来对所述第一至第四电容进行充电时，所述数据端输出的电压信号的正半周电压信号导通所述第五电开关，以对所述第三及第四电容进行补充充电，所述数据端输出的电压信号的负半周电压信号截止第五电开关，以停止对所述第三及第四电容进行补充充电。其中，所述第二电开关及所述第四电开关并联。对于副分区的像素单元，当所述第二至第四电开关均被启动，在充电电压处于正半周时，所述第五电开关启动，所述充电电压通过所述第二电开关、所述第四电开关及所述第五电开关同时对第三及第四电容进行充电，在正半周的充电能力增强相对放电能力增强；而在负半周时，所述第五电开关截止，只有第二电开关对所述第三及第四电容进行充电，充放电能力不变。即在副分区，像素单元在充电电压正半周的电位会提高，负半周电位不变，则位于所述正周期与负周期中间的公共端电压上升，从而与主分区的像素单元的公共端电压达到一致，解决了液晶显示器出现闪烁的状况，从而提高液晶显示装置的品质。
附图说明
为了更清楚地说明本发明的技术方案，下面将对实施方式中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施方式，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以如这些附图获得其他的附图。
图1是本发明第一方案第一较佳实施方式提供的一种液晶驱动电路的电路图；
图2是本发明第一方案第二较佳实施方式提供的一种液晶驱动电路的电路图。
具体实施方式
下面将结合本发明实施方式中的附图，对本发明实施方式中的技术方案进行清楚、完整地描述。
请参阅图1，本发明第一方案第一较佳实施方式提供一种液晶驱动电路100。所述液晶驱动电路100用于对液晶显示装置的像素单元进行供电。所述 像素单元包括主分区及副分区。所述液晶驱动电路100包括第一电开关T1、第二电开关T2、第三电开关T3、第四电开关T4、第五电开关T5、第一电容C1、第二电容C2、第三电容C3及第四电容C4。所述第一及第二电容C1及C2位于所述主分区。所述第三及第四电容C3及C4位于所述副分区。所述第一至第四电开关T1-T4的控制端均连接至栅控端G，以接收控制信号。所述第一电开关T1的第一端连接至所述第一及第二电容C1及C2的第一端。所述第一电开关T1的第二端连接至所述第二电开关T2的第一端，并连接至数据端D，以接收充电电压。所述第二电开关T2的第二端连接至所述第三电开关T3的第一端，并连接至所述第三及第四电容C3及C4的第一端。所述第三电开关T3的第二端连接至公共电压端COM。所述第一至第四电容C1-C4的第二端均连接至所述公共电压端COM，以接收公共端电压。所述第四电开关T4的第一端连接至所述数据端D，以接收所述充电电压。所述第四电开关T4的第二端连接至所述第五电开关T5的第一端，所述第五电开关T5的第二端连接至所述第三及第四电容C3及C4的第一端。当所述控制信号开启所述第一至第四电开关T1-T4来对所述第一至第四电容C1-C4进行充电时，所述数据端D输出的电压信号的正半周电压信号导通所述第五电开关T5，以对所述第三及第四电容C3及C4进行补充充电，所述数据端D输出的电压信号的负半周电压信号截止第五电开关T5，以停止对所述第三及第四电容C3及C4进行补充充电。
需要说明的是，对于每个像素单元，通常为了防止液晶被极化采用充电电压的正半周和负半周交替是驱动是的一个基本要求。如果充电电压大于公共端电压为正半周，充电电压小于公共端电压则为负半周，公共端电压设在正负半周的中心。其中，主分区的像素单元在正周期充电能力与放电能力相同，主分区的像素单元在负周期充电能力与放电能力相同，则公共端电压设在正负半周的中心。而在副分区，像素单元在正周期充电能力相对放电能力较弱，在负周期充电能力相对较强。这种充电能力不对称使得在副分区的像素单元的公共端电压低于在主分区的像素单元的公共端电压，无法保持一致，从而导致液晶显示装置的图像闪烁。而在本实施方式中，所述第二电开关T2及所述第四电开关T4并联。对于副分区的像素单元，当所述第二至第四电开关T2-T4均被启 动，在充电电压处于正半周时，所述第五电开关T5启动，所述充电电压通过所述第二电开关T2、所述第四电开关T4及所述第五电开关T5同时对第三及第四电容C3及C4进行充电，在正半周的充电能力增强相对放电能力增强；而在负半周时，所述第五电开关T5截止，只有第二电开关对所述第三及第四电容C3及C4进行充电，充放电能力不变。即在副分区，像素单元在充电电压正半周的电位会提高，负半周电位不变，则位于所述正周期与负周期中间的公共端电压上升，从而与主分区的像素单元的公共端电压达到一致，解决了液晶显示器出现闪烁的状况，从而提高液晶显示装置的品质。
在本实施方式中，所述第一至第四电开关T1-T4为晶体管。所述第一至第四电开关T1-T4的控制端、第一端及第二端分别为所述晶体管的栅极、源极及漏极。
可选地，所述第五电开关T5为晶体管。所述第五电开关T5的第一端为所述晶体管的源极。所述第五电开关T5的第二端为所述晶体管的漏极，所述晶体管的栅极连接至所述晶体管的源极。
在本实施方式中，所述晶体管均为NPN型晶体管。在其他的实施方式中，所述晶体管的类型也可以根据实际需要进行调整。
请参阅图2，本发明第一方案第二较佳实施方式提供一种液晶驱动电路200。所述第二较佳实施方案提供的液晶驱动电路200与所述第一较佳实施方式提供的液晶驱动电路100相似，两者的区别在于：在第二较佳实施方式中，所述第五电开关T51为二极管。所述第五电开关T51的第一端为所述二极管的阳极。所述第五电开关T51的第二端为所述二极管的阴极。
在其他的实施方式中，所述第五电开关T51也可以根据实际进行调整，只要满足单向导通功能的器件即可。
本发明第二方案较佳实施方式提供一种液晶显示装置。所述液晶显示装置包括像素单元及为所述像素单元进行供电的液晶驱动电路。所述像素单元包括主分区及副分区。在本实施方式中，所述液晶驱动电路可以为所述第一方案的第一较佳实施方式提供的液晶驱动电路100。在其他的实施方式中，所述液晶驱动电路也可以为所述第一方案的第二较佳实施方式提供的液晶驱动电路200。
其中，所述液晶驱动电路100的结构功能已在第一方案中进行了详细的阐述，在此不再赘述。
对于每个像素单元，通常为了防止液晶被极化采用充电电压的正半周和负半周交替是驱动是的一个基本要求。如果充电电压大于公共端电压为正半周，充电电压小于公共端电压则为负半周，公共端电压设在正负半周的中心。其中，主分区的像素单元在正周期充电能力与放电能力相同，主分区的像素单元在负周期充电能力与放电能力相同，则公共端电压设在正负半周的中心。而在副分区，像素单元在正周期充电能力相对放电能力较弱，在负周期充电能力相对较强。这种充电能力不对称使得在副分区的像素单元的公共端电压低于在主分区的像素单元的公共端电压，无法保持一致，从而导致液晶显示装置的图像闪烁。而在本实施方式中，所述第二电开关T2及所述第四电开关T4并联。对于副分区的像素单元，当所述第二至第四电开关T2-T4均被启动，在充电电压处于正半周时，所述第五电开关T5启动，所述充电电压通过所述第二电开关T2、所述第四电开关T4及所述第五电开关T5同时对第三及第四电容C3及C4进行充电，在正半周的充电能力增强相对放电能力增强；而在负半周时，所述第五电开关T5截止，只有第二电开关对所述第三及第四电容C3及C4进行充电，充放电能力不变。即在副分区，像素单元在充电电压正半周的电位会提高，负半周电位不变，则位于所述正周期与负周期中间的公共端电压上升，从而与主分区的像素单元的公共端电压达到一致，解决了液晶显示器出现闪烁的状况，从而提高液晶显示装置的品质。
以上所述是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也视为本发明的保护范围。

Claims (10)

  1. 一种液晶驱动电路，用于对液晶显示装置的像素单元进行供电，所述像素单元包括主分区及副分区，其特征在于：所述液晶驱动电路包括第一电开关、第二电开关、第三电开关、第四电开关、第五电开关、第一电容、第二电容、第三电容及第四电容，所述第一及第二电容位于所述主分区，所述第三及第四电容位于所述副分区，所述第一至第四电开关的控制端均连接至栅控端，以接收控制信号，所述第一电开关的第一端连接至所述第一及第二电容的第一端，所述第一电开关的第二端连接至所述第二电开关的第一端，并连接至数据端，以接收充电电压，所述第二电开关的第二端连接至所述第三电开关的第一端，并连接至所述第三及第四电容的第一端，所述第三电开关的第二端连接至公共电压端，所述第一至第四电容的第二端均连接至所述公共电压端，以接收公共端电压，所述第四电开关的第一端连接至所述数据端，以接收所述充电电压，所述第四电开关的第二端连接至所述第五电开关的第一端，所述第五电开关的第二端连接至所述第三及第四电容的第一端，当所述控制信号开启所述第一至第四电开关，来对所述第一至第四电容进行充电时，所述数据端输出的电压信号的正半周电压信号导通所述第五电开关，以对所述第三及第四电容进行补充充电，所述数据端输出的电压信号的负半周电压信号截止第五电开关，以停止对所述第三及第四电容进行补充充电。
  2. 如权利要求1所述的液晶驱动电路，其特征在于，所述第一至第四电开关为晶体管，所述第一至第四电开关的控制端、第一端及第二端分别为所述晶体管的栅极、源极及漏极。
  3. 如权利要求2所述的液晶驱动电路，其特征在于，所述第五电开关为晶体管，所述第五电开关的第一端为所述晶体管的源极，所述第五电开关的第二端为所述晶体管的漏极，所述晶体管的栅极连接至所述晶体管的源极。
  4. 如权利要求3所述的液晶驱动电路，其特征在于，所述晶体管均为NPN型晶体管。
  5. 如权利要求2所述的液晶驱动电路，其特征在于，所述第五电开关为二极管，所述第五电开关的第一端为所述二极管的阳极，所述第五电开关的第二 端为所述二极管的阴极。
  6. 一种液晶显示装置，包括像素单元及为所述像素单元进行供电的液晶驱动电路，所述像素单元包括主分区及副分区，所述液晶驱动电路包括第一电开关、第二电开关、第三电开关、第四电开关、第五电开关、第一电容、第二电容、第三电容及第四电容，所述第一及第二电容位于所述主分区，所述第三及第四电容位于所述副分区，所述第一至第四电开关的控制端均连接至栅控端，以接收控制信号，所述第一电开关的第一端连接至所述第一及第二电容的第一端，所述第一电开关的第二端连接至所述第二电开关的第一端，并连接至数据端，以接收充电电压，所述第二电开关的第二端连接至所述第三电开关的第一端，并连接至所述第三及第四电容的第一端，所述第三电开关的第二端连接至公共电压端，所述第一至第四电容的第二端均连接至所述公共电压端，以接收公共端电压，所述第四电开关的第一端连接至所述数据端，以接收所述充电电压，所述第四电开关的第二端连接至所述第五电开关的第一端，所述第五电开关的第二端连接至所述第三电容及所述第四电容的第一端，当所述控制信号开启所述第一至第四电开关，来对所述第一至第四电容进行充电时，所述数据端输出的电压信号的正半周电压信号导通所述第五电开关，以对所述第三及第四电容进行补充充电，所述数据端输出的电压信号的负半周电压信号截止第五电开关，以停止对所述第三及第四电容进行补充充电。
  7. 如权利要求6所述的液晶显示装置，其特征在于，所述第一至第四电开关为晶体管，所述第一至第四电开关的控制端、第一端及第二端分别为所述晶体管的栅极、源极及漏极。
  8. 如权利要求7所述的液晶显示装置，其特征在于，所述第五电开关为晶体管，所述第五电开关的第一端为所述晶体管的源极，所述第五电开关的第二端为所述晶体管的漏极，所述晶体管的栅极连接至所述晶体管的源极。
  9. 如权利要求8所述的驱动控制电路，其特征在于，所述晶体管均为NPN型晶体管。
  10. 如权利要求7所述的液晶显示装置，其特征在于，所述第五电开关为二极管，所述第五电开关的第一端为所述二极管的阳极，所述第五电开关的第二端为所述二极管的阴极。
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