CN101149548B - Vertical orientation mode liquid crystal display device pixel circuit - Google Patents
Vertical orientation mode liquid crystal display device pixel circuit Download PDFInfo
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- CN101149548B CN101149548B CN200710047855A CN200710047855A CN101149548B CN 101149548 B CN101149548 B CN 101149548B CN 200710047855 A CN200710047855 A CN 200710047855A CN 200710047855 A CN200710047855 A CN 200710047855A CN 101149548 B CN101149548 B CN 101149548B
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Abstract
This invention discloses a sort of picture element circuit of the plumb type liquid crystal device, and it consists of the grating line which is fixed in the reciprocal chiasmata manner, the data wire, the thin film transistor, the liquid crystal capacitance, and the storage capacitance. This liquid crystal capacitance and the storage capacitance connect with the data wire by the thin film transistor. This liquid crystal capacitance is fixed to the different signal voltage in the different time slice of the one frame, and it makes the liquid crystal molecule in the two different inclined states at least in the one frame period in order to realize the multi-domain display effect.
Description
Technical field
The present invention relates to a kind of image element circuit, particularly relate to a kind of image element circuit of vertical alignment mode thin-film transistor LCD device.
Background technology
Liquid crystal in the liquid crystal indicator itself is not luminous, and liquid crystal display is to reverse the light transmission rate of controlling liquid crystal cells by the electric field controls liquid crystal molecule, thereby reaches the purpose of demonstration.Generally, among the TFT-LCD (thin-film transistor LCD device) liquid crystal is enclosed between the upper and lower base plate.In the TFT-LCD of vertical alignment mode, liquid crystal molecule generally is made of for negative and anisotropic liquid crystal material specific inductive capacity.With reference to United States Patent (USP) 6661488B1, the upper and lower base plate of liquid crystal indicator is not applying under the voltage condition, and liquid crystal molecule 106 is arranged perpendicular to first substrate 101 and second substrate 104, as Figure 1A; Voltage signal can be by being attached to first substrate 101 respectively and the public electrode above second substrate 104 102 applies with pixel electrode 103.Applying under the voltage condition, liquid crystal molecule 106 trends towards arranging perpendicular to direction of an electric field, thereby departs from the direction perpendicular to first, second substrate 101,104.Concrete deflection angle is relevant with institute's bias voltage size that applies, as Figure 1B.So, change the light transmission characteristic of liquid crystal pixel, realize the demonstration of image by the modulation of voltage signal realization to liquid crystal molecule.
In the time of the liquid crystal molecules tilt certain angle, the observer will observe different display effects from different perspectives, the visual angle problem of Here it is liquid crystal indicator.For solving the visual angle problem, the multiple technologies scheme has been proposed.Wherein, the liquid crystal indicator of vertical alignment mode is by designing the different subregion in angle of inclination (farmland) in pixel, as MVA (Multi-domain Vertical Alignment, multi-domain vertical alignment), PVA (Patterned Vertical Alignment, image is vertical orientated) technology, the display characteristic of pixel is wherein each the farmland effect of integral mean spatially.Like this, the difference of seeing when observing liquid crystal display device from different perspectives reduces, and the visual angle is improved.With reference to Fig. 1, the MVA liquid crystal indicator makes in the pixel region 100 that is defined by gate line 108 and data line 109 intersections and forms different four sub regions (farmland) A in angle of inclination, B by forming projection 105 on the public electrode 102 or form slit 107 on pixel electrode 103, C, D.Pixel electrode 103 forms the voltage signal that electric capacity is used to keep writing pixel electrode 103 with the overlapping region of public electrode wire 110.
For further improving the visual angle, lower the phenomenon of colour cast, the transparency electrode that connects with TFT in the liquid crystal pixel zone further is divided into different zones, as United States Patent (USP) 7113233B2.Transparency electrode can be but be not limited to tin indium oxide (Indium Tin Oxide, be called for short ITO) or zinc paste (Zinc Oxide is called for short ZnO) and wait and have concurrently transparent and material conductive features.Illustrate as Fig. 2, pass through certain method, make the voltage on the zones of different that is divided in the pixel have certain difference according to design, liquid crystal molecules tilt degree varies sample, be in 201 and 202 two kind of heeling condition respectively, eight farmlands so just on the basis on original four farmlands, have been increased to, with the further viewing angle characteristic that improves.
The eight farmland display modes that United States Patent (USP) 7113233B2 proposes are that the effect by the capacitances in series dividing potential drop forms the first sub-pixel A, the second sub-pixel B with different magnitudes of voltage and realizes that there is a unsettled electrode in this implementation method.As Fig. 3 signal, this image element circuit includes liquid crystal capacitance C
LCA, C
LCB, memory capacitance C
STA, C
STB, the second sub-pixel B goes up the additional capacitor C of series connection
SINWith liquid crystal capacitance C
LCBPublic unsettled electrode 300.Accumulation that unsettled electrode 300 can bring static charge by coupling and electric leakage, and the electric charge of accumulation is difficult to discharge, and can cause remnant DC voltages cause problems such as the performance of image error GTG and image retention.
For solving the problem that electric charge accumulation that above-mentioned unsettled electrode brings brings, there is multiple scheme to be suggested.But these improved plans make pixel become complicated, and pixel aperture ratio descends, and has also introduced new problem, comprise that discharge TFT offsets the dividing potential drop effect of additional capacitor, and liquid crystal pixel writes level value and is subjected to previous frame to write the influence etc. of numerical value.And pixel design has been determined the division of zones of different in the pixel, and the scale between the zone is the fixing value that can not change flexibly, and the adjustment of gamma characteristic realizes underaction.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of image element circuit that is used for LCD device in vertical orientation mode, from the time domain division of view, increases the number on farmland in the pixel, improve LCD device in vertical orientation mode the visual angle, weaken its colour cast.
For achieving the above object, the invention provides a kind of image element circuit of LCD device in vertical orientation mode, comprise gate line, data line arranged in a crossed manner mutually; Thin film transistor (TFT), liquid crystal capacitance, memory capacitance; Described liquid crystal capacitance and memory capacitance are connected to data line by thin film transistor (TFT); Wherein said thin film transistor (TFT) comprises the first film transistor, second thin film transistor (TFT), its gate electrode is electrically connected mutually with first grid polar curve, second grid line respectively, the source electrode is electrically connected with first data line, second data line respectively, described first grid polar curve, the different time points of second grid line in a frame time are opened respectively, make the different time sections of liquid crystal capacitance in a frame time be set at unlike signal voltage.
Based on above-mentioned design, the image element circuit of LCD device in vertical orientation mode of the present invention is set at unlike signal voltage by making the different time sections of liquid crystal capacitance in a frame time, make liquid crystal molecule in a frame time, be in two kinds of different heeling conditions, realize the multidomain display effect.Compared with prior art, have following advantage: 1, adjustable ratio between two states of pixel, for the performance of pixel optimized image provides dirigibility, be easy to regulate gamma characteristic, help improving contrast, improve display quality; 2, pixel need not further to be divided into different zones, can further increase the number on farmland on the basis of the number on existing farmland, avoided since sub-pixel cut apart bring such as the problems such as static charge accumulation on the suspended electrode; 3, have broad applicability, go for any need spatially division, also be applicable to the liquid crystal indicator of the vertical alignment mode of PVA or other application similar principles so that the orientation technology of visual angle equalization both had been applicable to MVA.
In order further to understand feature of the present invention and technology contents, see also following about detailed description of the present invention and accompanying drawing.Yet accompanying drawing is only for reference and aid illustration usefulness, is not construed as limiting the invention.
Description of drawings
Figure 1A is not applying the situation of the arranging synoptic diagram of liquid crystal molecule under the voltage condition for the multi-domain vertical orientation mode liquid crystal indicator;
Figure 1B is applying the situation of the arranging synoptic diagram of liquid crystal molecule under the voltage condition for the multi-domain vertical orientation mode liquid crystal indicator;
Fig. 1 C is the planar structure synoptic diagram of the pixel region of multi-domain vertical orientation mode liquid crystal indicator;
Fig. 2 is the different heeling condition synoptic diagram of liquid crystal molecule in the different subpixel zone in the multi-domain vertical orientation mode liquid crystal indicator in the prior art;
Fig. 3 is a kind of image element circuit structure synoptic diagram that is used for the multi-domain vertical orientation mode liquid crystal indicator in the prior art;
Fig. 4 is the two kind different heeling condition synoptic diagram of liquid crystal molecule in a frame time of the LCD device in vertical orientation mode of use image element circuit of the present invention;
Fig. 5 is image element circuit structure in the embodiment of the invention one (a) and corresponding signal waveform synoptic diagram (b);
Fig. 6 is image element circuit structure in the embodiment of the invention two (a) and corresponding signal waveform synoptic diagram (b);
Fig. 7 is image element circuit structure in the embodiment of the invention three (a) and corresponding signal waveform synoptic diagram (b), and the driving circuit structure synoptic diagram (c) of LCD.
100: pixel
103: 104: the second substrates of pixel electrode
105: projection 106: liquid crystal molecule
107: slit 108: controlling grid scan line
109: data line
110: public electrode wire
Liquid crystal molecule state among 201: the first sub-pixel A
Liquid crystal molecule state among 202: the second sub-pixel B
300: unsettled electrode
301,302: the two kind heeling conditions of liquid crystal molecule in a frame time
DL: data line DL1: the first data line DL2: second data line
GL: gate lines G L1: first grid polar curve GL2: second grid line
T: thin film transistor (TFT)
T1: 2: the second thin film transistor (TFT) T3 of the first film transistor T: the 3rd thin film transistor (TFT)
C
LC, C
LCA, C
LCB: liquid crystal capacitance
C
ST, C
STA, C
STB: memory capacitance
C
SIN, C
CS: additional capacitor
Vcom: public electrode
V
GL: the voltage signal on the gate line
V
GL1: the voltage signal V on the first grid polar curve
GL2: the voltage signal on the second grid line
V
DL: the voltage signal on the data line
V
DL1: the voltage signal on first data line
V
DL2: the voltage signal on second data line
V1, V2: voltage signal
601: selector switch
602: output buffer
Embodiment
The invention will be further described below in conjunction with accompanying drawing and exemplary embodiments.
Core concept of the present invention is by the time domain modulation, make liquid crystal molecule be in the heeling condition of setting as required more than a kind of in a modulation period, thereby color offset phenomenon is weakened at the visual angle of improving vertically aligned liquid crystal display on the effect of time integral.
In the following examples all to equal sweep time of a frame modulation period:
Embodiment one
With reference to Fig. 5 (a), the image element circuit of LCD device in vertical orientation mode includes first grid polar curve GL1, the second grid line GL2 that first direction extends, the first data line DL1, the second data line DL2 that second direction is extended, the first film transistor T 1, the second thin film transistor (TFT) T2, memory capacitance C
ST, liquid crystal capacitance C
LCFirst grid polar curve GL1 and second grid line GL2 that the first film transistor T 1, the second thin film transistor (TFT) T2 are transmitted sweep signal respectively control memory capacitance C
ST, liquid crystal capacitance C
LCBe connected with the first data line DL1, the second data line DL2 respectively by the first film transistor T 1, the second thin film transistor (TFT) T2; The gate electrode that is the first film transistor T 1, the second thin film transistor (TFT) T2 is electrically connected mutually with first grid polar curve GL1, second grid line GL2 respectively, and the source electrode is electrically connected with the first data line DL1, the second data line DL2 respectively.
With reference to Fig. 5 (b), coordinate transverse axis t express time, longitudinal axis V
DL1Voltage signal on the expression data line DL1, V
DL2Voltage signal, V on the expression data line DL2
GL1Voltage signal on the expression gate lines G L1, V
GL2Voltage signal on the expression gate lines G L2 is a modulation period, just in the frame time, the process that has twice data-signal to write, arrive tc in the time 0, first grid polar curve GL1 controls first thin film transistor (TFT) T1 and opens, the voltage signal V above the first data line DL1
DL1Write the pixel liquid crystal capacitor C
LC, and these data will remain to tm.At time tm, second thin film transistor (TFT) T2 of second grid line GL2 control opens the voltage signal V above the second data line DL2
DL2Write the pixel liquid crystal capacitor C
LC, and these data will remain to tf modulation period.The process that writes and keep by above-mentioned two secondary data, in a modulation period, the pixel liquid crystal capacitor C
LCBe in two kinds of voltage statuss above in the time in two stages respectively, the heeling condition of liquid crystal molecule also correspondingly is in two states in the same area.So, realized on the time domain in the modulation period, just in the frame time, two kinds of heeling conditions of liquid crystal molecule.If this pixel was the MVA or the PVA pixel on one four farmland originally, through the modulation on the time domain, this pixel can present the display effect on eight farmlands.
Embodiment two:
With reference to Fig. 6 (a), the image element circuit of LCD device in vertical orientation mode also is provided with and is used for the additional capacitor that electric charge is shared, described thin film transistor (TFT) comprises the first film transistor T 1, the second thin film transistor (TFT) T2, the 3rd thin film transistor (TFT) T3, described first, the 3rd thin film transistor (TFT) T1, the gate electrode of T3 and first grid polar curve GL1 are electrically connected, the source electrode and the data line DL of the first film transistor T 1 are electrically connected, the gate electrode of the second thin film transistor (TFT) T2 and second grid line GL2 are electrically connected, be that the first grid polar curve GL1 that the first film transistor T 1 and the 3rd thin film transistor (TFT) T3 are transmitted sweep signal controls, the second grid line GL2 that the second thin film transistor (TFT) T2 is transmitted sweep signal controls, described liquid crystal capacitance C
LCBy the second thin film transistor (TFT) T2 and additional capacitor C
CSConnect additional capacitor C
CSElectrode be electrically connected mutually with source, the drain electrode of the 3rd thin film transistor (TFT) T3 respectively, described first grid polar curve GL1, the different time points of second grid line GL2 in a frame time are opened respectively, make liquid crystal capacitance C
LCDifferent time sections input in a frame time has unlike signal voltage.Only need a data line in the image element circuit structure of present embodiment, reduced by a data line with respect to embodiment one.
With reference to Fig. 6 (b), coordinate transverse axis t express time, longitudinal axis V
DLVoltage signal on the expression data line DL, longitudinal axis V
GL1Voltage signal on the expression first grid polar curve GL1, longitudinal axis V
GL2Voltage signal on the expression second grid line GL2.A modulation period, just in the frame time, once the process that writes of data-signal is shared the process of startup with an electric charge.Arrive tc in the time 0, first grid polar curve GL1 control the first film transistor T 1 and the 3rd thin film transistor (TFT) T3 open the voltage signal V above the data line DL
DLWrite the pixel liquid crystal capacitor C by the first film transistor T 1
LC, and these data will remain to tm.Simultaneously, additional capacitor C
CSOwing to opening, the 3rd thin film transistor (TFT) T3 discharges.At time tm, second grid line GL2 controls the second thin film transistor (TFT) T2 and opens, liquid crystal capacitance C
LCWith memory capacitance C
STTop electric charge will be by the second thin film transistor (TFT) T2 and additional capacitor C
CSShare.Suppose that it is respectively V that electric charge is shared the voltage of relative public electrode Vcom on the pixel electrode of front and back
LCWith V
LC_SH, memory capacitance C
STSize be C
ST, liquid crystal capacitance C
LCSize be C
LC, additional capacitor C
CSSize be C
CS, then following relation is set up:
V
LC_SH＝V
LC*(C
LC+C
ST)/(C
LC+C
ST+C
CS)
Obviously, in a modulation period, the pixel liquid crystal capacitor C
LCThe voltage that is born is in two kinds of value V respectively in the time in two stages
LCWith V
LC_SH, and V
LC_SHBe V
LCFunction, become certain proportionate relationship.Therefore, the heeling condition of liquid crystal molecule also correspondingly is in two states in the same area.So, realized on the time domain in the modulation period, just in the frame time, two kinds of heeling conditions of liquid crystal molecule.If this pixel was the MVA or the PVA pixel on one four farmland originally, through the modulation on the time domain, this pixel can present the display effect on eight farmlands.
Embodiment three:
With reference to Fig. 7 (a), the image element circuit of LCD device in vertical orientation mode is provided with a thin film transistor (TFT) T, and the gate lines G L that is transmitted sweep signal controls.Be provided with memory capacitance C in the image element circuit
ST, liquid crystal capacitance C
LCWherein, liquid crystal capacitance C
LCLink to each other with data line DL by thin film transistor (TFT) T.
With reference to Fig. 7 (b), coordinate transverse axis t express time, longitudinal axis V
GLVoltage signal on the expression gate lines G L, V
DLVoltage signal on the expression data line DL.A modulation period, just in the frame time, the process that has twice data-signal to write, promptly the different time points control TFT T of gate lines G L in a frame time opens, and input voltage signal makes liquid crystal capacitance C respectively
LCDifferent time sections input in a frame time has unlike signal voltage, arrives tc in the time 0, and gate lines G L control TFT T opens, and the voltage signal above the data line DL writes the pixel liquid crystal capacitor C by thin film transistor (TFT) T
LCWith memory capacitance C
ST, and these data will remain to tm.At time tm, gate lines G L control TFT T once more opens, and carries out the process that data write once more, and the new voltage signal above the data line DL writes the pixel liquid crystal capacitor C once more by thin film transistor (TFT) T
LCWith memory capacitance C
ST, and these data will remain to tf.Since in a modulation period, the pixel liquid crystal capacitor C
LCThe voltage that is born is in two kinds of magnitudes of voltage of being sent into by data line DL respectively in the time in two stages, the heeling condition of liquid crystal molecule also correspondingly is in two states in the same area.So, realized on the time domain in the modulation period, just in the frame time, two kinds of heeling conditions of liquid crystal molecule.If this pixel was the MVA or the PVA pixel on one four farmland originally, through the modulation on the time domain, this pixel can present the display effect on eight farmlands.
With reference to Fig. 7 (c), in a modulation period, described liquid crystal capacitance C
LCTwo varying voltage signals of last input can be realized by LCD drive circuits, described driving circuit comprises output buffer 602 and selector switch 601, described two voltage signals are electrically connected with output buffer 602 mutually by selector switch 601, described output buffer 602 is electrically connected with data line DL, described selector switch 601 and gate lines G L synchronization action.Respectively by driving circuit produce and be output in node V1 and node V2 with two kinds of signals of the latter half previous stage in modulation period, and these two signal V1, V2 pass through selector switch 601 and are connected with output buffer 602.In each modulation period, selector switch 601 is synchronously moved with gate lines G L, and selection is connected to node V1 or node V2 the input end of output buffer 602.The output of output buffer 602 is connected on the data line DL above the display panels, cooperates gate lines G L suitable voltage signal to be write the liquid crystal capacitance C of respective pixel
LC
Claims (1)
1. the image element circuit of a LCD device in vertical orientation mode comprises
Mutual gate line, data line arranged in a crossed manner;
Thin film transistor (TFT), liquid crystal capacitance, memory capacitance;
Described liquid crystal capacitance and memory capacitance are connected to data line by thin film transistor (TFT);
It is characterized in that described thin film transistor (TFT) comprises the first film transistor, second thin film transistor (TFT), its gate electrode is electrically connected mutually with first grid polar curve, second grid line respectively, the source electrode is electrically connected with first data line, second data line respectively, described first grid polar curve, the different time points of second grid line in a frame time are opened respectively, make the different time sections of liquid crystal capacitance in a frame time be set at unlike signal voltage.
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| CN200710047855A CN101149548B (en) | 2007-11-06 | 2007-11-06 | Vertical orientation mode liquid crystal display device pixel circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710047855A CN101149548B (en) | 2007-11-06 | 2007-11-06 | Vertical orientation mode liquid crystal display device pixel circuit |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009101180388A Division CN101493623B (en) | 2007-11-06 | 2007-11-06 | Pixel circuit of LCD device in vertical orientation mode |
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| CN101149548A CN101149548A (en) | 2008-03-26 |
| CN101149548B true CN101149548B (en) | 2010-05-19 |
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| CN101581858B (en) | 2008-05-16 | 2012-02-08 | 群康科技(深圳)有限公司 | Vertical alignment liquid crystal display device and driving method thereof |
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Owner name: NANJING CEC-PANDA LCD TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: SVA (GROUP) CO., LTD. Effective date: 20110714 |
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Free format text: CORRECT: ADDRESS; FROM: 200233 BUILDING 3, NO. 757, YISHAN ROAD, XUHUI DISTRICT, SHANGHAI TO: 210038 NO. 9, HENGYI ROAD, NANJING ECONOMIC AND TECHNOLOGICAL DEVELOPMENT ZONE, NANJING CITY, JIANGSU PROVINCE |
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Effective date of registration: 20110714 Address after: 210038 Nanjing economic and Technological Development Zone, Jiangsu Province, Hengyi Road, No. 9, No. Patentee after: Nanjing CEC Panda LCD Technology Co., Ltd. Address before: 200233, Shanghai, Yishan Road, No. 757, third floor, Xuhui District Patentee before: SVA (Group) Co., Ltd. |