CN201177957Y - Liquid crystal display device - Google Patents

Abstract

The utility model discloses a liquid crystal display device. A second thin film transistor is added on the Cs electrode of each liquid crystal unit on the framework of a prior liquid crystal display device, a pixel electrode is respectively controlled to be charged by image data and constant strobe voltage through a first thin film transistor and the second thin film transistor, not only the motion blur phenomena caused by the residual image of the last frame can be effectively eliminated, but also the time of the image data for charging into the pixel electrode can not be shortened, and meanwhile, the device is applicable to the normally white LCD or the normally block LCD.

Description

Liquid crystal indicator

Technical field

The utility model relates to a kind of liquid crystal indicator, relates in particular to a kind of liquid crystal indicator of eliminating the motion blur phenomenon that afterimage produced of previous frame.

Background technology

LCD (LCD) is to utilize the variation that is clipped in electric field intensity on the liquid crystal molecule, and the power that changes the orientation control printing opacity of liquid crystal molecule is come display image.At present, LCD since its have in light weight, volume is little, thin thickness, be used in widely in the various big-and-middle undersized terminal presentation facilities.In general, LCD comprises LCD panel with picture element matrix and the driving circuit that is used to drive this LCD panel.

As shown in Figure 1, LCD comprises: display panels 11, and it has picture element matrix; Gate drivers 12 is used for the gate lines G L of display panels 11 is driven gating; Source electrode driver 13 is used for the data line DL of display panels 11 is driven; Wherein, gate drivers 12 and source electrode driver 13 are by time schedule controller 14 controls.

At display panels 11, there is liquid crystal in each zone that between gate lines G L and data line DL, intersects, liquid crystal cells Clc forms matrix distribution in display panels 11; In the zone of this intersection, there is a n type thin film transistor (TFT) nTFT, as the residing gate lines G L of nTFT during by gating, the data-signal of data line DL charges into liquid crystal cells Clc, and keeps this data-signal by memory capacitance Cs; The other end of Cs electric capacity is communicated with by a CS electrode wires parallel with gate lines G L; Liquid crystal cells Clc changes the state of liquid crystal according to signal, shows to realize GTG thereby control transmittance.When not applying electric field, when display panels 11 is shown as white picture, claim that this LCD is normally white LCD in liquid crystal; When not applying electric field, when display panels 11 is shown as the black picture, claim that this LCD is common-black type LCD in liquid crystal.

LCD is a sampling maintenance display device, and the afterimage of previous frame is easy to generate the dynamic fuzzy phenomenon of motion picture.In order to eliminate the motion blur phenomenon, the LCD of prior art has been used the driving method that inserts black data.Use black insertion technology that different implementations is arranged, a kind of mode is by improving frame rate black frame data to be inserted between the frame, but this will shorten the duration of charging of view data; Another kind of mode is to cut apart horizontal cycle to make less realization of pressure reduction of interior liquid crystal cells in a certain period deceive picture, and shortcoming is that this mode is only applicable to common-black type LCD.Existing disclosed utility model patent CN1892787A is in the following way: for each liquid crystal cells increases a thin film transistor (TFT) TFT, by the switch of this thin film transistor (TFT) of second grid driver control TFT, thereby insert black data.But this mode need increase the second grid line, and aperture opening ratio descends to some extent.

The utility model content

Technical problem to be solved in the utility model provides a kind of liquid crystal indicator that can eliminate the motion blur phenomenon, guarantees the time that view data charges into, and can be applicable to normally white or common-black type LCD simultaneously, and does not influence aperture opening ratio.

The utility model is to solve the problems of the technologies described above the technical scheme that adopts to provide a kind of liquid crystal indicator, comprising:

Display panels, comprise many CS electrode wires, many gate lines, many data lines and the liquid crystal cells that in the zone of those gate lines and those data lines intersection, is matrix distribution, corresponding each liquid crystal cells exists a first film transistor and one second thin film transistor (TFT) in the zone of this intersection;

Time schedule controller produces timing control signal;

Source electrode driver drives the data line of described display panels;

Gate drivers drives described the first film transistor by gate line;

The Cs electrode driver drives described second thin film transistor (TFT) by the CS electrode wires;

Wherein, the grid of described second thin film transistor (TFT) links to each other with described CS electrode wires with source electrode, the drain electrode of described second thin film transistor (TFT) links to each other with described the first film transistor drain, to each frame display cycle, in first scan period, gate drivers gating the first film transistor, liquid crystal cells charges into the data-signal on the data line; In second scan period, Cs electrode driver gating second thin film transistor (TFT), liquid crystal cells charge into gate voltage fixing on the CS electrode wires.

Above-mentioned liquid crystal indicator, wherein, described gate drivers and described Cs electrode driver are integrated into the bigrid driver.

Above-mentioned liquid crystal indicator, wherein, described second thin film transistor (TFT) is pTFT or nTFT.

Liquid crystal indicator of the present utility model, on the framework of available liquid crystal display device, Cs electrode to each liquid crystal cells increases by one second thin film transistor (TFT), by the first film transistor and second thin film transistor (TFT), control pixel electrode respectively and charge into view data and fixing gate voltage, can effectively eliminate the motion blur phenomenon that afterimage produced of previous frame, can not shorten the time that pixel electrode charges into view data again, be applicable to normally white or common-black type LCD simultaneously.The contrast prior art, the utility model is controlled second thin film transistor (TFT) by the CS electrode wires and is realized black plug or Plug Grey, does not increase metal wire, therefore can not reduce aperture opening ratio.The Cs electrode driver is similar with the gate driver drive mode, is easy to realize that both can be integrated into the bigrid driver.

Description of drawings

Fig. 1 is the liquid crystal display device structure synoptic diagram of prior art.

Fig. 2 is the liquid crystal display device structure synoptic diagram of the utility model embodiment 1.

Fig. 3 is the drive principle figure of corresponding diagram 2.

Fig. 4 is the liquid crystal display device structure synoptic diagram of the utility model embodiment 2.

Fig. 5 is drive principle figure embodiment illustrated in fig. 4.

Fig. 6 is the liquid crystal display device structure synoptic diagram of the utility model embodiment 3.

Among the figure:

11 display panels, 12 gate drivers, 13 source electrode drivers

14 time schedule controllers, 21 Cs electrode drivers, 22 bigrid drivers

Embodiment

The utility model will be further described below in conjunction with drawings and Examples.

Embodiment 1

Fig. 2 shows the liquid crystal display device structure synoptic diagram of the utility model embodiment 1; Fig. 3 is the drive principle figure of corresponding diagram 2.

See also Fig. 2 and Fig. 3, on available liquid crystal display device structure basis, increase a pTFT as the 2nd TFT at liquid crystal cells partial C s electrode, the grid of described the 2nd TFT links to each other with the CS electrode wires with source electrode, and drain electrode links to each other with Cs electric capacity.Its drive principle as shown in Figure 3, in the time T of a frame, the VGH pulse gate that GL in this liquid crystal cells is exported by gate drivers 12 constantly at t1, at this moment, data-signal on the DL charges to Clc, when the voltage transition on the GL was VGL, the TFT on the GL closed, and the pressure reduction at Clc two ends is kept by Cs electric capacity; Therefore, from the t1 moment to t2 constantly, the GTG that the liquid crystal cells display image is required.At t2 constantly, the pTFT in this liquid crystal cells on the Cs electrode is by the VC2 pulse gate of Cs electrode driver 21 outputs, and at this moment, Clc is charged to VC2, and liquid crystal cells is shown as black grey scale.When the voltage transition on the Cs electrode was VC1, the pTFT on this Cs electrode was closed, and the voltage that charges into is kept by Cs electric capacity equally.From this embodiment as seen, liquid crystal cells in the time cycle of a frame, from t1 constantly t2 constantly, the GTG that the liquid crystal cells display image is required, other are shown as black constantly, thereby realize the purpose of black plug.

Embodiment 2

Fig. 4 shows the liquid crystal display device structure synoptic diagram of the utility model embodiment 2; Fig. 5 is drive principle figure embodiment illustrated in fig. 4.

See also Fig. 4 and Fig. 5, on available liquid crystal display device structure basis, increase a nTFT as the 2nd TFT at liquid crystal cells partial C s electrode, the grid of described the 2nd TFT links to each other with the CS electrode wires with source electrode, and drain electrode links to each other with Cs electric capacity.Its drive principle as shown in Figure 5, in the time T of a frame, the VGH pulse gate that GL in this liquid crystal cells is exported by gate drivers 12 constantly at t1, at this moment, data-signal on the DL charges to Clc, when the voltage transition on the GL was VGL, the TFT on the GL closed, and the pressure reduction at Clc two ends is kept by Cs electric capacity; Therefore, from the t1 moment to t2 constantly, the GTG that the liquid crystal cells display image is required.At t2 constantly, the nTFT in this liquid crystal cells on the Cs electrode is by the VC2 pulse gate of Cs electrode driver 21 outputs, and at this moment, Clc is charged to VC2, and liquid crystal cells is shown as black grey scale.In this embodiment, the level of VC2 is higher than the level of VC1, with shown in Figure 3 just in time opposite.When the voltage transition on the Cs electrode was VC1, the nTFT on this Cs electrode was closed, and the voltage that charges into is kept by Cs electric capacity equally.From this embodiment as seen, liquid crystal cells in the time cycle of a frame, from t1 constantly t2 constantly, the GTG that the liquid crystal cells display image is required, other are shown as black constantly, thereby realize the purpose of black plug.

Embodiment 3

Fig. 6 is the liquid crystal display device structure synoptic diagram of the utility model embodiment 3.

See also Fig. 6, on available liquid crystal display device structure basis, increase a nTFT as the 2nd TFT at liquid crystal cells partial C s electrode, the grid of described the 2nd TFT links to each other with the CS electrode wires with source electrode, drain electrode links to each other with Cs electric capacity, and gate lines G L and CS electrode wires are driven by bigrid driver 22.In embodiment 2, gate lines G L is by gate driver drive, and the CS electrode wires is driven by the CS electrode driver; By the drive principle of the gate line of Fig. 5 and CS electrode wires as seen, the driving of gate line and CS electrode wires being similarly second order drives; Therefore, in the present embodiment, gate drivers and the Cs electrode driver further integrated among the embodiment 2 are bigrid driver 22, and promptly the type of drive of gate line shown in Fig. 5 and CS electrode wires realizes by bigrid driver 22.In the time T of a frame, the VGH pulse gate that the GL in this liquid crystal cells is exported by bigrid driver 22 constantly at t1, at this moment, data-signal on the DL charges to Clc, when the voltage transition on the GL was VGL, the TFT on the GL closed, and the pressure reduction at Clc two ends is kept by Cs electric capacity; Therefore, from the t1 moment to t2 constantly, the GTG that the liquid crystal cells display image is required.At t2 constantly, the nTFT in this liquid crystal cells on the Cs electrode is by the VC2 pulse gate of Cs electrode driver 21 outputs, and at this moment, C1c is charged to VC2, and liquid crystal cells is shown as black grey scale.When the voltage transition on the Cs electrode was VC1, the nTFT on this Cs electrode was closed, and the voltage that charges into is kept by Cs electric capacity equally.In the present embodiment, liquid crystal cells in the time cycle of a frame, from t1 constantly t2 constantly, the GTG that the liquid crystal cells display image is required, other are shown as black constantly, thereby realize the purpose of black plug.Same is bigrid driver 22 to gate drivers among the embodiment 1 and Cs electrode driver, is not giving unnecessary details at this.

Though the utility model discloses as above with preferred embodiment; right its is not in order to limit the utility model; any those skilled in the art; in not breaking away from spirit and scope of the present utility model; when doing a little modification and perfect, therefore protection domain of the present utility model is worked as with being as the criterion that claims were defined.

Claims (3)

1, a kind of liquid crystal indicator comprises:

Display panels, comprise many CS electrode wires, many gate lines, many data lines and the liquid crystal cells that in the zone of those gate lines and those data lines intersection, is matrix distribution, corresponding each liquid crystal cells exists a first film transistor and one second thin film transistor (TFT) in the zone of this intersection;

Time schedule controller produces timing control signal;

Source electrode driver drives the data line of described display panels;

Gate drivers drives described the first film transistor by gate line;

The Cs electrode driver drives described second thin film transistor (TFT) by the CS electrode wires;

Wherein, the grid of described second thin film transistor (TFT) links to each other with described CS electrode wires with source electrode, the drain electrode of described second thin film transistor (TFT) links to each other with described the first film transistor drain, to each frame display cycle, in first scan period, gate drivers gating the first film transistor, liquid crystal cells charges into the data-signal on the data line; In second scan period, Cs electrode driver gating second thin film transistor (TFT), liquid crystal cells charge into gate voltage fixing on the CS electrode wires.

2, liquid crystal indicator according to claim 1 is characterized in that, described gate drivers and described Cs electrode driver are integrated into the bigrid driver.

3, liquid crystal indicator according to claim 1 is characterized in that, described second thin film transistor (TFT) is pTFT or nTFT.

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