WO2012171234A1 - 液晶显示装置及其驱动方法 - Google Patents

液晶显示装置及其驱动方法 Download PDF

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Publication number
WO2012171234A1
WO2012171234A1 PCT/CN2011/076584 CN2011076584W WO2012171234A1 WO 2012171234 A1 WO2012171234 A1 WO 2012171234A1 CN 2011076584 W CN2011076584 W CN 2011076584W WO 2012171234 A1 WO2012171234 A1 WO 2012171234A1
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WO
WIPO (PCT)
Prior art keywords
liquid crystal
thin film
film transistor
display device
scan
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2011/076584
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English (en)
French (fr)
Inventor
侯鸿龙
贺成明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TCL China Star Optoelectronics Technology Co Ltd
Original Assignee
Shenzhen China Star Optoelectronics Technology Co Ltd
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Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US13/380,852 priority Critical patent/US9105253B2/en
Publication of WO2012171234A1 publication Critical patent/WO2012171234A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D89/00—Aspects of integrated devices not covered by groups H10D84/00 - H10D88/00
    • 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
    • G02F1/13624—Active matrix addressed cells having more than one switching element per pixel
    • 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
    • G09G2300/0814—Several active elements per pixel in active matrix panels used for selection purposes, e.g. logical AND for partial update
    • 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
    • G09G2300/0876—Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes

Definitions

  • Liquid crystal display device and driving method thereof Liquid crystal display device and driving method thereof
  • the present invention relates to the field of liquid crystal display technology, and in particular to a liquid crystal display device and a driving method thereof.
  • liquid crystal display devices have been widely used in various electronic products such as computer display devices, televisions, notebook computers, mobile phones, digital cameras, etc. due to their advantages of lightness, power saving, and low radiation.
  • FIG. 1 is a schematic diagram showing the circuit structure of a liquid crystal display device of the prior art.
  • the conventional liquid crystal display device 10 includes a liquid crystal panel 100.
  • the liquid crystal panel 100 includes a plurality of scanning lines 111 parallel to each other and a plurality of parallel data lines 112.
  • the scanning line 111 and the data line 112 are alternately disposed in an insulated manner to define a plurality of pixel units 101.
  • Each of the pixel units 101 includes a thin film transistor 102, a storage capacitor 103, and a liquid crystal capacitor 104 disposed near the intersection of the scan line 111 and the data line 112.
  • the gate of the thin film transistor 102 is connected to the scan line 111, the source is connected to the data line 112, the drain is connected to one end of the storage capacitor 103, and the liquid crystal capacitor 104 is connected in parallel with the storage capacitor 103.
  • the liquid crystal display device 10 further includes a backlight (not shown) disposed under the liquid crystal panel 100 to provide a desired backlight for the liquid crystal panel 100.
  • a backlight (not shown) disposed under the liquid crystal panel 100 to provide a desired backlight for the liquid crystal panel 100.
  • the white continuous spectrum light source is a commonly used backlight, but in order to save energy and reduce cost, the industry has proposed a Field-sequential-color (FSC) method, that is, designing three-color separated RGB-LED array colors.
  • the sequential scanning backlight replaces the traditional white continuous spectrum light source, and the RGB LED light is used as the backlight instead of the color filter to eliminate the color filter, thereby saving the manufacturing cost of the liquid crystal display device and reducing the cost. Light loss rate, improve luminous efficiency and reduce power consumption.
  • a scan signal is first input to the scan line 111 to sequentially scan the gate of the thin transistor 102 of each pixel unit 101, thereby turning on the thin film transistor 102 and Loading the data signal through the data line 112 to the storage capacitor 103 and the liquid crystal The capacitor 104, wherein the liquid crystal capacitor 104 provides a rotating voltage for the liquid crystal. Then, after waiting for the LCD to go to position, turn on the backlight.
  • Each of the partitions includes a plurality of scanning lines 111, and the gates of the thin film transistors 102 connected to the scanning lines 111 are sequentially turned on in one frame. When the liquid crystal is turned on, the liquid crystal will rotate, resulting in optical changes.
  • the technical problem to be solved by the present invention is to provide a liquid crystal display device and a driving method thereof, which can reduce the number of LEDs and reduce the cost.
  • a liquid crystal display device comprising: a plurality of pixel units arranged in a matrix, each pixel unit comprising: a scan line; a data line; a storage capacitor; a liquid crystal capacitor; a second storage capacitor connected in parallel with the liquid crystal capacitor; and a first thin film transistor, a source of the first thin film transistor is connected to the data line, and a gate of the first thin film transistor is connected to the scan line, first The drain of the thin film transistor is connected to the first storage capacitor, and each pixel unit further includes: a second thin film transistor, a source of the second thin film transistor is connected to a drain of the first thin film transistor, and a drain and a liquid crystal of the second thin film transistor Capacitor connection, and gates of the plurality of second thin film transistors are connected to each other to control the plurality of second thin film transistors to be simultaneously turned on; the first storage capacitor includes a first common electrode and a first storage electrode, and the second
  • the scan line includes a plurality of first scan lines and a second scan line, each of the first scan lines is respectively connected to the gate of the first thin film transistor, and the second scan line is connected to the plurality of second thin lines.
  • the gate of the membrane transistor is connected to the plurality of first thin film transistor.
  • the liquid crystal display device further includes: a data driver connected to the data line, and applying a pixel voltage to the data line, and sequentially applying the pixel voltage to the sources of the plurality of first thin film transistors.
  • the liquid crystal display device further includes:
  • a scan driver is connected to the first scan line and the second scan line, and the scan driver applies a scan voltage to the first scan line one by one, and sequentially applies a scan voltage to the gates of the plurality of first thin film transistors to store the pixel voltage to First storage capacitor;
  • the scan driver scans the plurality of first scan lines and scans the second scan lines, and simultaneously turns on the gates of the plurality of second thin film transistors to transfer the pixel voltage from the first storage electrode of the first storage capacitor to the liquid crystal capacitor and the second The pixel electrode of the storage capacitor.
  • the liquid crystal display device further includes: a common voltage generator that supplies a common voltage to the first common electrode, the second common electrode, and the third common electrode.
  • a liquid crystal display device comprising: a plurality of pixel units arranged in a matrix, each pixel unit comprising: a scan line; a data line; a storage capacitor; a liquid crystal capacitor; and a first thin film transistor, wherein a source of the first thin film transistor is connected to the data line, a gate of the first thin film transistor is connected to the scan line, and a drain of the first thin film transistor is connected to the first storage capacitor,
  • Each of the pixel units further includes: a second thin film transistor, a source of the second thin film transistor is connected to a drain of the first thin film transistor, a drain of the second thin film transistor is connected to the liquid crystal capacitor, and a gate of the plurality of second thin film transistors
  • the poles are connected to each other to control the simultaneous opening of the plurality of second thin film transistors.
  • the liquid crystal display device further includes: a data driver connected to the data line, and applying a pixel voltage to the data line, and sequentially applying the pixel voltage to the sources of the plurality of first thin film transistors.
  • the liquid crystal display device further includes: a scan driver connected to the scan line, and applying a scan voltage to the scan lines one by one, sequentially applying the scan voltage to the plurality of first The gate of the thin film transistor to store the pixel voltage to the first storage capacitor.
  • each of the pixel units further includes: a second storage capacitor connected in parallel with the liquid crystal capacitor.
  • the scan driver is connected to the gates of the plurality of second thin film transistors.
  • the scan driver scans the gates of the plurality of first thin film transistors
  • the scan driver simultaneously turns on the gates of the plurality of second thin film transistors. a pole to transfer the pixel voltage from the first storage capacitor to the liquid crystal capacitor and the second storage capacitor.
  • the first storage capacitor includes a first common electrode and a first storage electrode
  • the second storage capacitor includes a second common electrode and a pixel electrode
  • the liquid crystal capacitor includes a oppositely disposed pixel electrode and a third common electrode.
  • the pixel electrode is connected to the drain of the second thin film transistor, and the first common electrode, the second common electrode, and the third common electrode are connected to each other.
  • the liquid crystal display device further includes: a common voltage generator that supplies a common voltage to the first common electrode, the second common electrode, and the third common electrode.
  • another technical solution for the present invention is to provide a driving method for a liquid crystal display device, which includes the following steps: sequentially storing pixel voltages of respective pixel units in a liquid crystal panel to corresponding storage capacitors After each storage capacitor is fully charged, the pixel voltage stored in each storage capacitor is simultaneously applied to each corresponding pixel unit to simultaneously drive the liquid crystal in each pixel unit to generate rotation.
  • the method further includes: rotating the liquid crystal to the positioning to provide a backlight to the liquid crystal panel.
  • each storage capacitor is again charged while the backlight is being provided.
  • the beneficial effects of the present invention are: different from the prior art, the liquid crystal display device of the present invention and the driving method thereof, by disposing a second thin film transistor in each pixel unit, allowing the pixel voltage to be charged, first to the first storage capacitor , does not immediately enter each liquid crystal capacitor, so the liquid crystal molecules will not rotate.
  • the gates of the plurality of second thin film transistors are connected to each other, and the gate of the last scan line is also fully charged.
  • the plurality of second thin film transistors are controlled to be turned on at the same time, and the voltage of the first storage capacitor is introduced into each liquid crystal capacitor, so that the liquid crystal is simultaneously rotated, and after the liquid crystal is rotated to the position, the backlight is turned on.
  • the invention reduces the waiting time for the gate scanning, increases the illumination time of the backlight, achieves the purpose of reducing the number of LEDs, and reduces the cost; meanwhile, since the backlight is provided on the whole surface without partitioning, the original is improved. There is a problem of uneven brightness and poor backlight coupling when there is a partition display, which improves the quality of the picture.
  • FIG. 1 is a schematic circuit diagram of a prior art liquid crystal display device
  • FIG. 2 is a schematic view showing the circuit structure of a preferred embodiment of the liquid crystal display device of the present invention.
  • FIG. 3 is a schematic diagram showing the circuit structure of each pixel unit in FIG. 2;
  • Figure 4 is a partial cross-sectional view of the pixel unit shown in Figure 3;
  • Figure 5 is a timing chart showing the operation of the liquid crystal display device of the present invention.
  • Figure 6 is a flow chart showing a driving method of a preferred embodiment of the liquid crystal display device of the present invention. ⁇ detailed description ⁇
  • FIG. 2 is a schematic diagram showing the circuit structure of a preferred embodiment of the liquid crystal display device of the present invention
  • FIG. 3 is a schematic diagram showing the circuit structure of the pixel unit of FIG.
  • the liquid crystal display device 20 of the present invention comprises: a liquid crystal panel 21, a scanning voltage generator 22, a scan driver 23, a data driver 24, and a common voltage generator 25.
  • the liquid crystal panel 21 includes a plurality of scan lines 231 and a plurality of data lines 241.
  • the plurality of scan lines 231 are respectively connected to the scan driver 23, and the scan driver 23 is further connected to the scan voltage generator 22; the plurality of data lines 241 are respectively connected to the data driver. twenty four.
  • the scan line 231 and the data line 241 are absolutely
  • the edge mode cross setting further defines a plurality of pixel units 210 arranged in a matrix.
  • each pixel unit 210 includes: a scan line 231, a data line 241, a first thin film transistor 211, a first storage capacitor 212, a second thin film transistor 213, a liquid crystal capacitor 214, and a second storage capacitor 215.
  • FIG. 3 is a schematic structural diagram of each pixel unit 210 in FIG.
  • the first storage capacitor 212 includes a first storage electrode 2121 and a first common electrode 2122.
  • the second storage capacitor 215 includes a pixel electrode 2151 and a second common electrode 2152.
  • the liquid crystal capacitor 214 includes a pixel electrode 2151 and a third common Electrode 2142. Also, the first common electrode 2122, the second common electrode 2152, and the third common electrode 2142 are connected to the common voltage generator 25, respectively.
  • the gate 2111 of the first thin film transistor 211 is connected to the scan line 231, the source 2112 of the first thin film transistor 211 is connected to the data line 241, the drain 2113 of the first thin film transistor 211 and the first storage electrode of the first storage capacitor 212. 2121 connection.
  • the drain 2113 of the first thin film transistor 211 is further connected to the source 2132 of the second thin film transistor 213, and the drain 2133 of the second thin film transistor 213 is connected to the pixel electrode 2151 of the liquid crystal capacitor 214.
  • the gates 2131 of the plurality of second thin film transistors 213 in the liquid crystal display panel 21 are connected to each other and connected to the scan driver 23 through the scan line 232 to control the plurality of second thin film transistors 213 to be simultaneously turned on.
  • the liquid crystal display device 20 provided by the embodiment of the present invention sets the second thin film transistor 213 in each pixel unit 210 so that the pixel voltage is charged to the first storage capacitor 212, and does not immediately enter each liquid crystal capacitor 214, so the liquid crystal molecules It will not turn.
  • the gates 2131 of the plurality of second thin film transistors 213 are connected to each other.
  • the plurality of second thin film transistors 213 are controlled to be simultaneously turned on, and the first storage capacitor 212 is turned on. The voltage is introduced into each liquid crystal capacitor 214 to cause the liquid crystal to rotate at the same time.
  • the backlight After the liquid crystal is rotated to the position, the backlight is turned on, the illumination time of the backlight is increased, the number of LEDs is reduced, and the cost is reduced. Meanwhile, since the backlight is provided in the whole surface , no partitioning is required, so the problem of uneven brightness and poor backlight coupling existing in the original partition display is improved, and the quality of the picture is improved.
  • FIG. 4 is a partial cross-sectional view of the pixel unit of FIG.
  • the first thin film transistor 211, the second thin film transistor 213, the first storage capacitor 212, and the second storage capacitor 215 Both are provided on the drive substrate 28 of the liquid crystal display panel 21.
  • the source 2112 and the drain 2113 of the first thin film transistor 211 and the source 2132 and the drain 2133 of the second thin film transistor 212 are disposed in the same layer, and the drain 2113 of the first thin film transistor 211 and the source of the second thin film transistor 213 2132 is connected to form a first storage electrode 2121 of the first storage capacitor 212.
  • the common electrode 2122 of the first storage capacitor 212 and the first storage electrode 2121 are separated by an insulating layer 26, and the pixel electrode 2151 of the second storage capacitor 215 and the second common electrode 2152 are separated by an insulating layer 27, wherein the first common The electrode 2122 and the pixel electrode 2151 are both transparent electrode layers.
  • the scan voltage generator 22 supplies the first scan voltage VGL and the second scan voltage VGH.
  • the first scan voltage VGL is used to control the turn-off of the first thin film transistor 211 and the second thin film transistor 213;
  • the second scan voltage VGH is used to control the conduction of the first thin film transistor 211 and the second thin film transistor 213.
  • the scan driver 23 receives the first scan voltage VGL and the second scan voltage VGH and sequentially outputs a plurality of scan signals to each of the scan lines 231 according to the two scan voltages VGL and VGH, and sequentially scans the plurality of scan lines 231 through the plurality of scan lines 231.
  • the gate 2111 of the first thin film transistor 211 When the scan driver 23 outputs a scan signal to each of the scan lines 231, the plurality of first thin film transistors 231 connected to the row of scan lines 231 are turned on.
  • the scan driver 23 is further provided with a scan line 232 and a gate 2131 of the plurality of second thin film transistors 213.
  • the scan driver 23 After the scan driver 23 scans the gates 2111 of the plurality of first thin film transistors 211, the scan driver 23 passes through the scan lines 232. At the same time, a scan signal is supplied to the gates 2131 of the plurality of second thin film transistors 213 such that the plurality of second thin film transistors 231 are simultaneously turned on.
  • the data driver 24 is connected to the source 2112 of the plurality of first thin film transistors 211 through a plurality of data lines 241 to provide a plurality of pixel voltages to the plurality of data lines 241 to pass the pixel voltages through the turned-on first thin film transistors 211
  • the source 2112 and the drain 2113 and the source 2132 and the drain 2133 of the turned-on second thin film transistor 213 are loaded to the pixel electrode 2151.
  • the common voltage generator 25 is connected to the first common electrode 2122, the second common electrode 2152, and the third common electrode 2142 to supply a common voltage to the first common electrode 2122, the second common electrode 2152, and the third common electrode 2142, respectively.
  • a source of the first thin film transistor 211 that is turned on at a pixel voltage After the pole 2112 and the drain 2113 and the source 2132 and the drain 2133 of the turned-on second thin film transistor 213 are loaded to the pixel electrode 2151, since there is a voltage difference between the common voltage and the pixel voltage on the liquid crystal capacitor 214, the liquid crystal therebetween is The figure is not shown) deflection occurs.
  • the present invention is realized by reducing the waiting time of the waiting gate.
  • the voltage enters the corresponding pixel unit.
  • the LCD will start to turn.
  • the storage capacitor is not immediately entered into the pixel unit, so the liquid crystal molecules are not rotated, and when the last gate of the liquid crystal display panel is also fully charged, the entire panel is again
  • the second scanning line 232 is turned on together, and the voltage of the storage capacitor is introduced into each pixel unit. At this time, the liquid crystal starts to rotate, and after the liquid crystal is rotated to the position, the backlight can be turned on.
  • FIG. 5 is a timing diagram showing the operation of the liquid crystal display device 20 of the present invention.
  • the liquid crystal display device 20 includes 1080 scanning lines as an example. Specifically, when the liquid crystal display device 20 of the present invention is in operation, the scanning signal is first sequentially supplied from the first strip G1 to each of the scanning signals.
  • the scan line 231 is electrically connected to the plurality of first thin film transistors 231 connected to the scan lines 231 to supply pixel voltages to the first storage electrodes 2121 of the respective first storage capacitors 212.
  • the scanning driver 23 scans the 1080th G1080, as shown by Gun in the figure, all the gates 2131 of the second thin film transistor 213 are turned on at the same time.
  • the scan driver 23 scans through the scan line 232 while providing a scan signal to the gates 2131 of the plurality of second thin film transistors 213 to control the plurality of second thin film transistors 213 to be simultaneously turned on, so that the pixel voltage is from the first storage capacitor 212.
  • a storage electrode 2121 is transferred to the liquid crystal capacitor 214 and the pixel electrode 2151 of the second storage capacitor 215.
  • the common voltage generator 25 generates a common voltage to be supplied to the first common electrode 2122, the second common electrode 2152, and the third common electrode 2142, respectively, such that a voltage difference between the common voltage and the pixel voltage exists on the liquid crystal capacitor 214, so that the liquid crystal capacitors are interposed.
  • the liquid crystal is rotated to achieve simultaneous rotation of the liquid crystal.
  • the backlight is supplied to the liquid crystal panel 21, and at the same time, the gates 2111 of the plurality of first thin film transistors 211 are scanned again by the scan driver 23, and the pixel voltage is continuously supplied to the first storage capacitor 212 for charging.
  • the liquid crystal display device 20 of the present invention Compared with the liquid crystal display device 10 of the prior art shown in FIG. 1, the liquid crystal display device 20 of the present invention, The plurality of second thin film transistors 213 are controlled to be simultaneously turned on by the scan driver 23 so that the liquid crystals are simultaneously rotated.
  • the backlight is divided into 8 regions, and each region has 135 scanning lines, 180 Hz as an example.
  • the prior art liquid crystal display device 10 is sequentially opened from the first to the 135 scanning lines 111, and the gates are sequentially arranged. After charging, the liquid crystals in the respective pixel units 101 are sequentially rotated. At this time, the backlight turn-on time must wait until the scanning of the 135th scanning line 111 is completed and the liquid crystal is turned to the positioning.
  • the backlight turn-on time of the liquid crystal display device 10 of the prior art is: a complete sub-frame is deducted for 1 to 135 scan times, and then the waiting time for the liquid crystal reaction is deducted.
  • the liquid crystal molecules are rotated to the position after waiting for 4.5 ms as described above. The backlight can be turned on.
  • the ms is much higher than the illuminating time of 0.385 ms in the prior art. Therefore, in order to achieve the same brightness, the number of LEDs required by the invention is less, and the cost is reduced;
  • the backlight is provided to avoid problems such as poor backlight coupling and uneven brightness, which improves the quality of the picture.
  • the gates 2131 of the plurality of second thin film transistors 213 are controlled to be simultaneously turned on by the scan driver 23. In other embodiments, the gates of the plurality of second thin film transistors 213 may be controlled by other means. 2131 is turned on at the same time.
  • FIG. 6 is a flow chart showing a driving method of a preferred embodiment of the liquid crystal display device of the present invention.
  • the driving method of the liquid crystal display device 20 of the present invention comprises the following steps:
  • Step 501 sequentially store the pixel voltages of the pixel units in the liquid crystal panel 21 into the corresponding first storage capacitors 212;
  • Step 502 After each of the first storage capacitors 212 is fully charged, simultaneously apply a pixel voltage stored in each of the first storage capacitors 212 to each corresponding pixel unit to simultaneously drive liquid crystal generation in each pixel unit. Rotate.
  • step 502 the pixel voltages stored in each of the first storage capacitors 212 are simultaneously applied to the pair.
  • Each pixel unit is configured to rotate the liquid crystal in the pixel unit at the same time; further comprising: providing a backlight to the liquid crystal panel 21 when the liquid crystal is rotated to the positioning, and simultaneously starting to charge the first storage capacitor 212 simultaneously A light source is supplied to the liquid crystal panel 21.
  • the liquid crystal display device and the driving method thereof provide a second thin film transistor in each pixel unit, so that the pixel voltage is first charged to the first storage capacitor after charging, and the liquid crystal capacitor is not immediately entered. Liquid crystal molecules also do not rotate.
  • the gates of the plurality of second thin film transistors are connected to each other.
  • the plurality of second thin film transistors are controlled to be simultaneously turned on, and the voltage of the first storage capacitor is introduced into the respective liquid crystal capacitors.
  • the liquid crystal is simultaneously rotated, and after the liquid crystal is rotated to the position, the backlight is turned on.
  • the invention reduces the waiting time for the gate scanning, increases the illumination time of the backlight, achieves the purpose of reducing the number of LEDs, and reduces the cost; meanwhile, since the backlight is provided on the whole surface without partitioning, the original is improved. There is a problem of uneven brightness and poor backlight coupling when there is a partition display, which improves the quality of the picture.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

一种液晶显示装置（20），其包括：按矩阵方式排列的多个像素单元（210）。每一像素单元（210）包括：扫描线（231），数据线（241），第一存储电容（212），液晶电容（214）以及第一薄膜晶体管（211）。第一薄膜晶体管（211）源极（2112）与数据线（241），栅极（2111）与扫描线（231）连接，漏极（2113）与第一存储电容（212）连接。每一像素单元（210）进一步包括第二薄膜晶体管（213）。第二薄膜晶体管（213）源极（2132）与第一薄膜晶体管（211）的漏极（2113），漏极（2133）与液晶电容（214）连接。多个第二薄膜晶体管（213）的栅极（2131）相互连接以控制这些第二薄膜晶体管（213）同时开启。第二薄膜晶体管（213）的这种设置使得液晶同时旋转。因此该液晶显示装置（20）可减少等待栅极扫描的时间，增加背光的发光时间，减少LED颗数，降低成本。

Description

液晶显示装置及其驱动方法
【技术领域】
本发明涉及液晶显示技术领域， 特别是涉及一种液晶显示装置及其驱动方 法。
【背景技术】
目前， 液晶显示装置凭借轻薄、 省电、 低辐射等优点， 已广泛应用于电脑 显示装置、 电视机、 笔记本电脑、 移动电话、 数码相机等各种电子产品。
请参阅图 1 , 图 1是一种现有技术的液晶显示装置的电路结构示意图。如图 1所示， 现有液晶显示装置 10包括液晶面板 100。 其中， 液晶面板 100包括多 条相互平行的扫描线 111、多条相互平行的数据线 112。扫描线 111和数据线 112 以绝缘方式交叉设置， 定义出多个像素单元 101。
每一像素单元 101包括设置于扫描线 111与数据线 112相交处附近的薄膜晶 体管 102、 存储电容 103以及液晶电容 104。
其中， 薄膜晶体管 102的栅极连接至扫描线 111 , 源极连接至数据线 112, 漏极连接至存储电容 103的一端， 且液晶电容 104与存储电容 103并联连接。
液晶显示装置 10进一步包括设置于液晶面板 100下方的背光源（图未示）， 为液晶面板 100提供所需的背光。 实际中， 白色连续光谱光源是一种常用的背 光源， 但为了节能和降低成本， 业界提出了色序法 (Field-sequential-color, FSC), 即：设计以三色分离 RGB-LED阵列色序法扫描背光源取代传统白色连续光谱光 源， 以 RGB的 LED发光作为背光并取代彩色滤光片的显色， 以省去彩色滤光 片， 由此可节省液晶显示装置的制造成本， 同时降低光损耗率、 提升发光效率 并降低耗电量。
具体而言， 在驱动现有技术的液晶显示装置 10时， 首先输入扫描信号至扫 描线 111 , 以依序扫描每一像素单元 101的薄晶体管 102的栅极， 进而使得薄膜 晶体管 102导通并且将数据信号通过数据线 112加载至存储电容 103以及液晶 电容 104, 其中， 液晶电容 104为液晶提供转动电压。 然后， 等待液晶转至定位 后， 打开背光。
更详细而言，由于色序法是以 RGB的 LED发光来产生色彩，所以 RGB 的 LED 须分区依序打开。 每一分区包含若干条扫描线 111 , 与扫描线 111连接的 薄膜晶体管 102 的栅极在一个帧 (frame)内会依序打开。 而液晶在栅极打开后， 即会转动， 产生光学变化。
现有技术在每一区内的所有栅极都打开， 且液晶分子转动到位后， 才能打 开背光， 影响了背光可开启的时间， 造成须增加 LED的颗数去达到亮度规格， 由此增加了成本。
【发明内容】
本发明主要解决的技术问题是提供一种液晶显示装置及其驱动方法， 以减 少 LED颗数， 降低成本的问题。
为解决上述技术问题， 本发明釆用的一个技术方案是： 提供一种液晶显示 装置， 其包括： 按矩阵方式排列的多个像素单元， 每一像素单元包括： 扫描线； 数据线； 第一存储电容； 液晶电容； 第二存储电容， 其与液晶电容并联连接； 以及第一薄膜晶体管， 第一薄膜晶体管的源极与数据线连接， 第一薄膜晶体管 的栅极与扫描线连接， 第一薄膜晶体管的漏极与第一存储电容连接， 每一像素 单元进一步包括： 第二薄膜晶体管， 第二薄膜晶体管的源极与第一薄膜晶体管 的漏极连接， 第二薄膜晶体管的漏极与液晶电容连接， 且多个第二薄膜晶体管 的栅极相互连接， 以控制多个第二薄膜晶体管同时开启； 第一存储电容包括第 一公共电极以及第一存储电极， 第二存储电容包括第二公共电极以及像素电极， 液晶电容包括相对设置的像素电极以及第三公共电极， 像素电极与第二薄膜晶 体管的漏极连接， 第一公共电极、 第二公共电极以及第三公共电极相互连接。
根据本发明一优选实施例， 扫描线包括多条第一扫描线和一条第二扫描线， 每一第一扫描线分别连接第一薄膜晶体管的栅极， 第二扫描线连接多个第二薄 膜晶体管的栅极。
根据本发明一优选实施例， 液晶显示装置进一步包括： 数据驱动器， 其与 数据线连接， 且向数据线施加像素电压， 依序将像素电压施加在多个第一薄膜 晶体管的源极。
根据本发明一优选实施例， 液晶显示装置进一步包括：
扫描驱动器， 与第一扫描线和第二扫描线连接， 扫描驱动器向第一扫描线 逐一施加扫描电压， 依序将扫描电压施加在多个第一薄膜晶体管的栅极， 以将 像素电压存储到第一存储电容；
扫描驱动器扫描完多条第一扫描线再扫描第二扫描线， 同时开启多个第二 薄膜晶体管的栅极， 以将像素电压从第一存储电容的第一存储电极转移至液晶 电容及第二存储电容的像素电极。
根据本发明一优选实施例， 液晶显示装置进一步包括： 公共电压产生器， 其为第一公共电极、 第二公共电极以及第三公共电极提供公共电压。
为解决上述技术问题， 本发明釆用的另一个技术方案是： 一种液晶显示装 置， 其包括： 按矩阵方式排列的多个像素单元， 每一像素单元包括： 扫描线； 数据线； 第一存储电容； 液晶电容； 以及第一薄膜晶体管， 第一薄膜晶体管的 源极与数据线连接， 第一薄膜晶体管的栅极与扫描线连接， 第一薄膜晶体管的 漏极与第一存储电容连接， 每一像素单元进一步包括： 第二薄膜晶体管， 第二 薄膜晶体管的源极与第一薄膜晶体管的漏极连接， 第二薄膜晶体管的漏极与液 晶电容连接， 且多个第二薄膜晶体管的栅极相互连接， 以控制多个第二薄膜晶 体管同时开启。
根据本发明一优选实施例， 液晶显示装置进一步包括： 数据驱动器， 其与 数据线连接， 且向数据线施加像素电压， 依序将像素电压施加在多个第一薄膜 晶体管的源极。
根据本发明一优选实施例， 液晶显示装置进一步包括： 扫描驱动器， 其与 扫描线连接， 且向扫描线逐一施加扫描电压， 依序将扫描电压施加在多个第一 薄膜晶体管的栅极， 以将像素电压存储到第一存储电容。
根据本发明一优选实施例， 每一像素单元进一步包括： 第二存储电容， 其 与液晶电容并联连接。
根据本发明一优选实施例， 扫描驱动器与多个第二薄膜晶体管的栅极连接， 在扫描驱动器扫描完多个第一薄膜晶体管的栅极时， 扫描驱动器同时开启多个 第二薄膜晶体管的栅极， 以将像素电压从第一存储电容转移至液晶电容及第二 存储电容。
根据本发明一优选实施例， 第一存储电容包括第一公共电极以及第一存储 电极， 第二存储电容包括第二公共电极以及像素电极， 液晶电容包括相对设置 的像素电极以及第三公共电极， 像素电极与第二薄膜晶体管的漏极连接， 第一 公共电极、 第二公共电极以及第三公共电极相互连接。
根据本发明一优选实施例， 液晶显示装置进一步包括： 公共电压产生器， 其为第一公共电极、 第二公共电极以及第三公共电极提供公共电压。
为解决上述技术问题， 本发明釆用的另一个技术方案是： 提供一种液晶显 示装置的驱动方法， 其包括以下步骤： 将液晶面板中各像素单元的像素电压依 序存储至对应的存储电容中； 待每一存储电容均充满电后， 同时将每一存储电 容中存储的像素电压施加于对应的每一像素单元， 以同时驱动每一像素单元中 的液晶产生旋转。
根据本发明一优选实施例， 还包括： 待液晶旋转至定位， 向液晶面板提供 背光。
根据本发明一优选实施例， 在提供背光的同时， 再度开始对每一存储电容 进行充电。
本发明的有益效果是： 区别于现有技术的情况， 本发明的液晶显示装置及 其驱动方法通过在每一像素单元设置第二薄膜晶体管， 让像素电压在充电后， 先到第一存储电容， 不立刻进入各液晶电容， 因此液晶分子也不会转动。 同时， 多个第二薄膜晶体管的栅极相互连接， 当最后一条扫描线的栅极也打开充满电 后， 控制多个第二薄膜晶体管同时开启， 将第一存储电容的电压导入各液晶电 容， 使液晶同时产生旋转， 待液晶转动至定位后， 打开背光。 由此， 本发明减 少了等待栅极扫描的时间， 增加了背光的发光时间， 达到减少 LED颗数， 降低 成本的目的； 同时， 因为背光是整面一齐提供， 不须分区， 所以改善了原有分 区显示时存在的亮度不均匀及背光耦合不良的问题， 提高画面的品质。
【附图说明】
为了更清楚地说明本发明实施例中的技术方案， 下面将对实施例描述中所 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 的一些实施例， 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， 还可以根据这些附图获得其他的附图。 其中：
图 1是一种现有技术的液晶显示装置的电路结构示意图；
图 2是本发明液晶显示装置的一优选实施例的电路结构示意图；
图 3是图 2中每一像素单元的电路结构示意图；
图 4是图 3所示的像素单元的部分剖面示意图；
图 5是本发明液晶显示装置工作的时序图；
图 6是本发明液晶显示装置的一优选实施例的驱动方法的流程图。 【具体实施方式】
请参见图 2-3 ,图 2是本发明液晶显示装置的优选实施例的电路结构示意图， 图 3是图 2中像素单元的电路结构示意图。 如图 2所示， 本发明的液晶显示装 置 20包括： 液晶面板 21、 扫描电压产生器 22、 扫描驱动器 23、 数据驱动器 24 以及公共电压产生器 25。
液晶面板 21包括多条扫描线 231 以及多条数据线 241 , 多条扫描线 231分 别连接至扫描驱动器 23 , 扫描驱动器 23进一步连接于扫描电压产生器 22; 多 条数据线 241分别连接至数据驱动器 24。 其中， 扫描线 231与数据线 241以绝 缘方式交叉设置， 进而定义出按矩阵方式排列的多个像素单元 210。在本实施例 中， 每一像素单元 210包括： 扫描线 231、 数据线 241、 第一薄膜晶体管 211、 第一存储电容 212、 第二薄膜晶体管 213、 液晶电容 214以及第二存储电容 215。
请结合图 3所示， 图 3是图 2中每一像素单元 210的结构示意图。 其中， 第一存储电容 212包括第一存储电极 2121以及第一公共电极 2122,第二存储电 容 215包括像素电极 2151以及第二公共电极 2152,液晶电容 214包括相对设置 的像素电极 2151 以及第三公共电极 2142。 并且， 第一公共电极 2122、 第二公 共电极 2152以及第三公共电极 2142分别连接于公共电压产生器 25。 第一薄膜 晶体管 211的栅极 2111与扫描线 231连接， 第一薄膜晶体管 211的源极 2112 与数据线 241连接， 第一薄膜晶体管 211的漏极 2113与第一存储电容 212的第 一存储电极 2121连接。 第一薄膜晶体管 211的漏极 2113进一步与第二薄膜晶 体管 213的源极 2132连接， 第二薄膜晶体管 213的漏极 2133与液晶电容 214 的像素电极 2151连接。 液晶显示面板 21 中的多个第二薄膜晶体管 213的栅极 2131相互连通并通过扫描线 232连接至扫描驱动器 23 , 以控制多个第二薄膜晶 体管 213同时开启。
本发明实施例提供的液晶显示装置 20通过在每一像素单元 210设置第二薄 膜晶体管 213 , 让像素电压在充电后， 先到第一存储电容 212, 不立刻进入各液 晶电容 214, 因此液晶分子也不会转动。 同时， 多个第二薄膜晶体管 213的栅极 2131相互连接， 当最后一条扫描线 231的栅极 2111也打开充满电后， 控制多个 第二薄膜晶体管 213同时开启，将第一存储电容 212的电压导入各液晶电容 214 , 使液晶同时产生旋转， 待液晶转动至定位后， 打开背光， 增加了背光的发光时 间， 达到减少 LED颗数， 降低成本的目的； 同时， 因为背光是整面一齐提供， 不须分区， 所以改善了原有分区显示时存在的亮度不均勾及背光耦合不良的问 题， 提高画面的品质。
请参见图 4, 图 4是图 3所述像素单元的部分剖面示意图。 如图 4所示， 第 一薄膜晶体管 211、第二薄膜晶体管 213、第一存储电容 212、第二存储电容 215 均设置在液晶显示面板 21的驱动基板 28上。 第一薄膜晶体管 211的源极 2112 和漏极 2113以及第二薄膜晶体管 212的源极 2132和漏极 2133设置为同一层， 第一薄膜晶体管 211的漏极 2113与第二薄膜晶体管 213的源极 2132连接形成 第一存储电容 212的第一存储电极 2121。第一存储电容 212的公共电极 2122与 第一存储电极 2121之间以绝缘层 26相隔， 第二存储电容 215的像素电极 2151 与第二公共电极 2152之间以绝缘层 27相隔， 其中第一公共电极 2122和像素电 极 2151均为透明电极层。
本实施方式中， 扫描电压产生器 22提供第一扫描电压 VGL和第二扫描电 压 VGH。 其中， 第一扫描电压 VGL用于控制第一薄膜晶体管 211和第二薄膜 晶体管 213的截止； 第二扫描电压 VGH用于控制第一薄膜晶体管 211和第二薄 膜晶体管 213的导通。
扫描驱动器 23接收第一扫描电压 VGL以及第二扫描电压 VGH并根据两个 扫描电压 VGL和 VGH依序输出多个扫描信号到每一扫描线 231 , 并且通过多 个扫描线 231依序扫描多个第一薄膜晶体管 211的栅极 2111。 当扫描驱动器 23 输出扫描信号到每一扫描线 231 时， 该行扫描线 231连接的多个第一薄膜晶体 管 231导通。扫描驱动器 23进一步设置有扫描线 232与多个第二薄膜晶体管 213 的栅极 2131相互连接， 在扫描驱动器 23扫描完多个第一薄膜晶体管 211的栅 极 2111后， 扫描驱动器 23通过扫描线 232同时提供扫描信号至多个第二薄膜 晶体管 213的栅极 2131 , 使得多个第二薄膜晶体管 231同时导通。
数据驱动器 24通过多个数据线 241与多个第一薄膜晶体管 211的源极 2112 连接， 以提供多个像素电压到多个数据线 241 , 以使像素电压经由导通的第一薄 膜晶体管 211的源极 2112和漏极 2113以及导通的第二薄膜晶体管 213的源极 2132和漏极 2133加载到像素电极 2151。
公共电压产生器 25与第一公共电极 2122、 第二公共电极 2152以及第三公 共电极 2142连接， 以将公共电压分别提供至第一公共电极 2122、 第二公共电极 2152以及第三公共电极 2142。 在像素电压经由导通的第一薄膜晶体管 211的源 极 2112和漏极 2113以及导通的第二薄膜晶体管 213的源极 2132和漏极 2133 加载到像素电极 2151后， 由于液晶电容 214上存在公共电压和像素电压的电压 差， 使得其间的液晶 （图未示）发生偏转。
为了增加背光可开启的时间， 本发明通过减少等待栅极的等待时间来实现。 现有技术中， 一旦栅极打开， 电压即会进入对应的像素单元。 液晶也就开始转 动。 然而， 本发明中， 让电压在充电后， 先到存储电容， 不立刻进入像素单元， 所以液晶分子也不会转动， 而当液晶显示面板的最后一条栅极也打开充满电后， 整个面板再一起打开第二条扫描线 232 , 将存储电容的电压导入各像素单元。 此 时液晶便开始转动， 待液晶转动至定位后， 背光便可打开。
请参阅图 5 , 图 5是本发明液晶显示装置 20工作的时序原理图。 以液晶显 示装置 20包括 1080条扫描线为例进行说明， 具体而言， 在本发明液晶显示装 置 20在工作时，首先通过扫描驱动器 23将扫描信号从第 1条 G1开始依序提供 至每一扫描线 231 , 该行扫描线 231连接的多个第一薄膜晶体管 231导通， 以将 像素电压分别提供至各个第一存储电容 212的第一存储电极 2121上。 在扫描驱 动器 23扫描完第 1080条 G1080时， 如图中 Gun所示， 再将所有的第二薄膜晶 体管 213的栅极 2131在同一时间一起开通。 即： 扫描驱动器 23通过扫描线 232 扫描同时提供扫描信号至多个第二薄膜晶体管 213的栅极 2131 , 以控制多个第 二薄膜晶体管 213 同时开启， 使得将像素电压从第一存储电容 212的第一存储 电极 2121转移至液晶电容 214和第二存储电容 215的像素电极 2151。 随后，公 共电压产生器 25 产生公共电压分别提供至第一公共电极 2122、 第二公共电极 2152以及第三公共电极 2142 , 使得液晶电容 214上存在公共电压与像素电压的 电压差， 使得液晶电容间的液晶产生旋转， 以实现液晶同时旋转。 在液晶转动 至定位之后， 向液晶面板 21提供背光， 同时， 再度通过扫描驱动器 23扫描多 个第一薄膜晶体管 211 的栅极 2111 , 继续将像素电压提供至第一存储电容 212 进行充电。
与图 1所示的现有技术的液晶显示装置 10相比，本发明的液晶显示装置 20, 通过扫描驱动器 23控制多个第二薄膜晶体管 213同时开启 ,使得液晶同时旋转。 以背光分为 8区，每一区内有 135条扫描线， 180Hz为例， 现有技术的液晶显示 装置 10开启顺序由第 1条依序开至 135条扫描线 111 , 各栅极依序充电， 各像 素单元 101中的液晶依序转动。 此时， 背光开启时间须等到第 135条扫描线 111 扫描完成且液晶转至定位， 才可以打开。 因此， 现有技术的液晶显示装置 10的 背光开启时间为： 一个完整的子帧（subframe )扣掉等待 1~135条扫描时间， 再 扣掉等待液晶反应时间。 其中每一个子帧为 l/180s, 即 5.56ms; 每条栅极的充 电时间为 5us, 即 0.005ms; 135条共花 0.005*135=0.675ms。 假设给液晶 4.5ms 的转动时间， 则现有技术的液晶显示装置 10 的背光可开启时间为： 5.56-0.675-4.5=0.385ms„假设液晶分子如前述需等待 4.5ms后转动至定位， 此时 背光便可开启。 由于节省了等待 1~1080条的扫瞄时间， 因此背光可开启的时间 即为： 一个完整的子帧扣掉等待液晶的反应时间， 即： 5.56-4.5=1.16ms。 1.16ms 与现有技术中 0.385ms的可发光时间相比， 增加不少。 因此， 如要达到同样的亮 度下， 本发明所需的 LED的颗数更少， 降低了成本； 同时因不须分区提供背光， 能够避免出现背光耦合不佳和亮度不均的问题， 提高了画面的品质。
值得注意的是， 在本发明中通过扫描驱动器 23进行控制多个第二薄膜晶体 管 213的栅极 2131 同时开启， 在其他实施例中， 可以通过其他方式控制多个第 二薄膜晶体管 213的栅极 2131 同时开启。
请参见图 6, 图 6是本发明液晶显示装置的优选实施例的驱动方法流程图。 如图 6所示， 本发明液晶显示装置 20的驱动方法包括以下步骤：
步骤 501 : 将液晶面板 21中各像素单元的像素电压依序存储至对应的第一 存储电容 212中；
步骤 502: 待每一第一存储电容 212均充满电后， 同时将每一第一存储电容 212中存储的像素电压施加于对应的每一像素单元，以同时驱动每一像素单元中 的液晶产生旋转。
在步骤 502中， 同时将每一第一存储电容 212中存储的像素电压施加于对 应的每一像素单元， 以使像素单元中的液晶同时旋转； 进一步包括： 待液晶旋 转至定位时， 向液晶面板 21提供背光， 与此同时再度开始对第一存储电容 212 进行充电， 以同时向液晶面板 21提供光源。
通过上述方式， 本发明实施例的液晶显示装置及其驱动方法通过在每一像 素单元设置第二薄膜晶体管， 让像素电压在充电后， 先到第一存储电容， 不立 刻进入各液晶电容， 因此液晶分子也不会转动。 同时， 多个第二薄膜晶体管的 栅极相互连接， 当最后一条扫描线的栅极也打开充满电后， 控制多个第二薄膜 晶体管同时开启， 将第一存储电容的电压导入各液晶电容， 使液晶同时产生旋 转， 待液晶转动至定位后， 打开背光。 由此， 本发明减少了等待栅极扫描的时 间， 增加了背光的发光时间， 达到减少 LED颗数， 降低成本的目的； 同时， 因 为背光是整面一齐提供， 不须分区， 所以改善了原有分区显示时存在的亮度不 均匀及背光耦合不良的问题， 提高画面的品质。
以上所述仅为本发明的实施例， 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

权 利 要求
1、 一种液晶显示装置， 所述液晶显示装置包括： 按矩阵方式排列的多个像 素单元， 每一所述像素单元包括：
扫描线；
数据线；
第一存储电容；
液晶电容；
第二存储电容， 所述第二存储电容与所述液晶电容并联连接； 以及 第一薄膜晶体管， 所述第一薄膜晶体管的源极与所述数据线连接， 所述第 一薄膜晶体管的栅极与所述扫描线连接， 所述第一薄膜晶体管的漏极与所述第 一存储电容连接， 其中：
每一所述像素单元进一步包括： 第二薄膜晶体管， 所述第二薄膜晶体管的 源极与所述第一薄膜晶体管的漏极连接， 所述第二薄膜晶体管的漏极与所述液 晶电容连接， 且多个所述第二薄膜晶体管的栅极相互连接， 以控制多个所述第 二薄膜晶体管同时开启；
所述第一存储电容包括第一公共电极以及第一存储电极， 所述第二存储电 容包括第二公共电极以及像素电极， 所述液晶电容包括相对设置的所述像素电 极以及第三公共电极， 所述像素电极与所述第二薄膜晶体管的漏极连接， 所述 第一公共电极、 所述第二公共电极以及所述第三公共电极相互连接。
2、 根据权利要求 1所述的液晶显示装置， 其中， 所述扫描线包括多条第一 扫描线和一条第二扫描线， 每一所述第一扫描线分别连接所述第一薄膜晶体管 的栅极， 所述第二扫描线连接多个所述第二薄膜晶体管的栅极。
3、 根据权利要求 2所述的液晶显示装置， 其中， 所述液晶显示装置进一步 包括：
数据驱动器， 所述数据驱动器与所述数据线连接， 且向所述数据线施加像 素电压， 依序将所述像素电压施加在多个所述第一薄膜晶体管的源极。
4、 根据权利要求 3所述的液晶显示装置， 其中， 所述液晶显示装置进一步 包括：
扫描驱动器， 与所述第一扫描线和所述第二扫描线连接， 所述扫描驱动器 向所述第一扫描线逐一施加扫描电压， 依序将所述扫描电压施加在多个所述第 一薄膜晶体管的栅极， 以将所述像素电压存储到所述第一存储电容；
所述扫描驱动器扫描完多条所述第一扫描线再扫描所述第二扫描线， 同时 开启多个所述第二薄膜晶体管的栅极， 以将所述像素电压从所述第一存储电容 的第一存储电极转移至所述液晶电容及所述第二存储电容的像素电极。
5、 根据权利要求 1所述的液晶显示装置， 其中， 所述液晶显示装置进一步 包括： 公共电压产生器， 所述公共电压产生器为所述第一公共电极、 所述第二 公共电极以及所述第三公共电极提供公共电压。
6、 一种液晶显示装置， 所述液晶显示装置包括： 按矩阵方式排列的多个像 素单元， 每一所述像素单元包括：
扫描线；
数据线；
第一存储电容；
液晶电容； 以及
第一薄膜晶体管， 所述第一薄膜晶体管的源极与所述数据线连接， 所述第 一薄膜晶体管的栅极与所述扫描线连接， 所述第一薄膜晶体管的漏极与所述第 一存储电容连接， 其中：
每一所述像素单元进一步包括： 第二薄膜晶体管， 所述第二薄膜晶体管的 源极与所述第一薄膜晶体管的漏极连接， 所述第二薄膜晶体管的漏极与所述液 晶电容连接， 且多个所述第二薄膜晶体管的栅极相互连接， 以控制多个所述第 二薄膜晶体管同时开启。
7、 根据权利要求 6所述的液晶显示装置， 其中， 所述液晶显示装置进一步 包括：
数据驱动器， 所述数据驱动器与所述数据线连接， 且向所述数据线施加像 素电压， 依序将所述像素电压施加在多个所述第一薄膜晶体管的源极。
8、 根据权利要求 7所述的液晶显示装置， 其中， 所述液晶显示装置进一步 包括：
扫描驱动器， 所述扫描驱动器与所述扫描线连接， 且向所述扫描线逐一施 加扫描电压， 依序将所述扫描电压施加在多个所述第一薄膜晶体管的栅极， 以 将所述像素电压存储到所述第一存储电容。
9、 根据权利要求 8所述的液晶显示装置， 其中， 每一所述像素单元进一步 包括：
第二存储电容， 所述第二存储电容与所述液晶电容并联连接。
10、 根据权利要求 9 所述的液晶显示装置， 其中， 所述扫描驱动器与多个 所述第二薄膜晶体管的栅极连接， 在所述扫描驱动器扫描完多个所述第一薄膜 晶体管的栅极时， 所述扫描驱动器同时开启多个所述第二薄膜晶体管的栅极， 以将所述像素电压从所述第一存储电容转移至所述液晶电容及所述第二存储电 容。
11、 根据权利要求 9 所述的液晶显示装置， 其中， 所述第一存储电容包括 第一公共电极以及第一存储电极， 所述第二存储电容包括第二公共电极以及像 素电极， 所述液晶电容包括相对设置的所述像素电极以及第三公共电极， 所述 像素电极与所述第二薄膜晶体管的漏极连接， 所述第一公共电极、 所述第二公 共电极以及所述第三公共电极相互连接。
12、 根据权利要求 11所述的液晶显示装置， 其中， 所述液晶显示装置进一 步包括： 公共电压产生器， 所述公共电压产生器为所述第一公共电极、 所述第 二公共电极以及所述第三公共电极提供公共电压。
13、 一种液晶显示装置的驱动方法， 其中， 所述驱动方法包括以下步骤： 将所述液晶面板中各像素单元的像素电压依序存储至对应的存储电容中； 待每一所述存储电容均充满电后， 同时将每一所述存储电容中存储的所述 像素电压施加于对应的每一所述像素单元， 以同时驱动每一所述像素单元中的 液晶产生旋转。
14、 根据权利要求 13所述的驱动方法， 其中， 还包括：
待所述液晶旋转至定位， 向所述液晶面板提供背光。
15、 根据权利要求 14所述的驱动方法， 其中， 在提供所述背光的同时， 再 度开始对每一所述存储电容进行充电。
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