CN201203738Y - Liquid crystal display device - Google Patents

Abstract

The utility model discloses a liquid crystal display device comprising: a plurality of first gate lines; a plurality of second gate lines; a plurality of data lines; and a plurality of pixels in matrix distribution in areas intersected with these data lines. Each pixel comprises a first thin film transistor, a second thin film transistor, a third thin film transistor, a fourth thin film transistor, a first subpixel electrode, a second subpixel electrode, and a charge shared capacitance. The utility model enables two subpixels to form various voltages through the voltage on the charge shared capacitance, so that it uses a data driver with fewer bits to represent color with greater bits, to improve color reproducibility and save cost.

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 that improves colorrendering quality.

Background technology

Liquid crystal indicator is one of the most widely used type in the current panel display apparatus.Liquid crystal indicator generally includes array base palte and colored optical filtering substrates and the liquid crystal layer between two substrates, and described two substrates have pixel electrode and the public electrode that is used to produce electric field.Liquid crystal indicator is by putting on voltage at electrode to produce electric field and display image in liquid crystal layer.

As shown in Figure 1, liquid crystal indicator comprises: display panels 10, and it has picture element matrix; Gate drivers 20 is used for the gate lines G L of display panels 10 is driven gating; Data driver 30 is used for the data line DL of display panels 10 is driven; Wherein, gate drivers 20 and data driver 30 are by timing controller 40 controls.

Have liquid crystal in each zone that intersects between gate lines G L and data line DL on the display panels 10, liquid crystal cells Clc forms matrix distribution in display panels 10; In the zone of this intersection, there is a thin film transistor (TFT) TFT, as the residing gate lines G L of TFT during by gating, the data-signal of data line DL charges into liquid crystal cells Clc, and keeps this data-signal by memory capacitance Cst; The other end of Cst 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.

The view data that receives from the outside such as R, G and B etc. are input to liquid crystal indicator, after the signal controller of liquid crystal indicator carries out suitable processing to view data, view data after handling is offered data driver 30, and data driver 30 concentrates selection and the corresponding gray scale voltage of view data to be applied on the pixel electrode of liquid crystal indicator from one group of gray scale voltage.

The bit number of data driver processing at present generally is no more than 8, because can handle the data driver price comparison costliness of 10 bits, be under the situation of 10 bits so work as received image signal, can be by it being processed into data such as 8 bits, reduce cost with realization

In order to realize realizing the color of bigger bit number with the data driver of fewer bit number, existent method is to come the several frame units of occasional combination and represent that the method for its central point realizes by the method for several pixels of combination on the space or the situation of increasing number at present, but this method causes problems such as resolution reduction or flicker easily.

The utility model content

Technical problem to be solved in the utility model provides a kind of liquid crystal indicator that improves colorrendering quality.

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:

Many first grid polar curves;

Many second grid lines;

Many data lines;

And a plurality of pixels that in the zone of those first grid polar curves and those data lines intersection, are matrix distribution, each pixel comprises the first film transistor respectively, second thin film transistor (TFT), the 3rd thin film transistor (TFT), the 4th thin film transistor (TFT), first pixel electrode, second pixel electrode, electric charge is shared electric capacity;

Wherein, the first grid polar curve of transistorized grid of described the first film and current line links to each other, and source electrode links to each other with data line, and drain electrode links to each other with first pixel electrode; The first grid polar curve of the grid of described second thin film transistor (TFT) and current line links to each other, and source electrode links to each other with data line, and drain electrode links to each other with second pixel electrode; The second grid line of the grid of described the 3rd thin film transistor (TFT) and current line links to each other, and source electrode links to each other with data line, and drain electrode is shared electric capacity with electric charge and linked to each other; The first grid polar curve of the grid of described the 4th thin film transistor (TFT) and next line links to each other, and source electrode links to each other with second pixel electrode and the shared electric capacity of electric charge respectively with drain electrode.

Above-mentioned liquid crystal indicator, wherein, the area of the area of described first sub-pixel and described second sub-pixel differs from one another.

The utility model contrast prior art has following beneficial effect: the utility model changes into the view data of higher bit first output image signal and second output image signal of less bit number, the elder generation's conducting the first film transistor and second thin film transistor (TFT), apply the pairing gray scale voltage of first output image signal to first sub-pixel and second sub-pixel, conducting the 3rd thin film transistor (TFT) applies the pairing gray scale voltage of second output image signal to the shared electric capacity of electric charge then, superpose second pixel electrode and electric charge of last conducting the 4th thin film transistor (TFT) shared voltage on the electric capacity, make two sub-pixels form different voltage, thereby the color of representing to have big bit number with the data driver of less bit number, improve colorrendering quality, saved cost.

Description of drawings

Fig. 1 is existing liquid crystal indicator structural representation.

Fig. 2 is a liquid crystal indicator structural representation of the present utility model.

Fig. 3 is dot structure figure of the present utility model.

Fig. 4 is the equivalent circuit diagram of the utility model pixel.

Fig. 5 is the utility model view data processing flow chart.

Fig. 6 is duty Fig. 1 of the utility model pixel.

Fig. 7 is duty Fig. 2 of the utility model pixel.

Fig. 8 is duty Fig. 3 of the utility model pixel.

Fig. 9 is a driving sequential chart of the present utility model.

Figure 10 is the utility model pixel intensity composition principle figure.

Embodiment

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

Fig. 2 is a liquid crystal indicator structural representation of the present utility model; Fig. 3 is dot structure figure of the present utility model; Fig. 4 is the equivalent circuit diagram of the utility model pixel.

See also Fig. 2, liquid crystal indicator of the present utility model comprises: display panels 10, and it has picture element matrix, and each pixel of the present utility model is controlled by four thin film transistor (TFT)s; Gate drivers 20 is used for the first grid polar curve Gate_n of display panels 10 is driven gating; Data driver 30 is used for the data line Source Line_m of display panels is driven; Liquid crystal indicator of the present utility model also comprises second grid driver 50, be used for the second grid line TFT3_Gate_k of display panels 10 is driven gating, wherein, gate drivers 20, second grid driver 50 and data driver 30 are by timing controller 10 controls.

Please continue referring to Fig. 3, liquid crystal indicator of the present utility model comprises many first grid polar curve Gate_n, many second grid line TFT3_Gate_k, many data line Source_Line_m (n, k and m are natural number), be arranged essentially parallel to the storage electrode line VCom of gate line, and a plurality of pixels that in the zone of those first grid polar curves and those data lines intersection, are matrix distribution, each pixel comprises the first pixel electrode Pa respectively, the second pixel electrode Pb, and electric charge is shared capacitor C 3, comprise the first film transistor T FT1, the second thin film transistor (TFT) TFT2, the 3rd thin film transistor (TFT) TFT3, the 4th thin film transistor (TFT) TFT4.

Please continue referring to Fig. 4, wherein, the first grid polar curve Gate_n of the grid of described the first film transistor T FT1 and current line links to each other, and source electrode links to each other with data line Source_Line_m, and drain electrode links to each other with the first sub-pixel capacitor C s1; The first grid polar curve Gate_n of the grid of the described second thin film transistor (TFT) TFT2 and current line links to each other, and source electrode links to each other with data line Source_Line_m, and drain electrode links to each other with the second sub-pixel capacitor C s2; The second grid line TFT3_Gate_k of the grid of described the 3rd thin film transistor (TFT) TFT3 and current line links to each other, and source electrode links to each other with data line Source_Line_m, and drain electrode is shared capacitor C 3 with electric charge and linked to each other; The first grid polar curve Gate_n+1 of the grid of described the 4th thin film transistor (TFT) TFT4 and next line links to each other, and source electrode links to each other with the second sub-pixel capacitor C s2 and the shared capacitor C 3 of electric charge respectively with drain electrode.

As mentioned above, each pixel electrode of liquid crystal indicator of the present utility model comprises the first pixel electrode Pa and the second pixel electrode Pb, and corresponding electric capacity is respectively the first sub-pixel capacitor C s1 and the second sub-pixel capacitor C s2; At first (be included in the timing controller by image signal processing unit, figure does not show) received image signal that will have first bit number is converted into first output image signal and second output image signal with second bit number littler than first bit number, and these picture signals are outputed to data driver 30, and data driver 30 concentrates selection and the corresponding gray scale voltage of view data to be applied on first and second pixel electrodes of liquid crystal indicator from one group of gray scale voltage.The area of first sub-pixel and second sub-pixel differs from one another, for display quality and the visual angle of taking into account image, area as the sub-pixel of main display pixel will be more greatly, and correspondingly the area of less important display pixel is smaller, and ratio between two is good in the scope of 1:1.8 to 1:2.

Fig. 5 is the utility model view data processing flow chart, and the received image signal that has provided first bit number is converted into first output image signal and second output image signal with second bit number.

See also Fig. 5, image processor comprises the look-up table LUX that produces first output image signal and second output image signal, is used for storing respectively first and second corrected values; Also comprise totalizer, respectively and the first and second corrected value additions that obtain of the back of tabling look-up with the data of received image signal most-significant byte.For example when received image signal is " 1001001101 ", at first input image data is divided into two parts: minimum dibit " 01 ", data with high 8 bits: " 10010011 ", go first and second table of corrections to obtain first and second corrected values according to minimum dibit " 01 " then such as being respectively " 0 " and " 1 ", first output image signal just becomes " 10010011+0 " so, second output image signal just becomes " 10010011+1 ", therefore the input image data of 10 bits just is converted into the viewdata signal of two 8 bits, and is transferred to data driver.

Then describe signal driving of the present utility model and the variation of pixel data gray scale voltage in detail according to Fig. 6～Fig. 8.

As shown in Figure 6, data voltage is being put in the time durations of a pixel column, at first apply the grid cut-in voltage to gate lines G ate_n, apply grid to gate lines G ate_n+1 and second grid line TFT3_Gate_k and close voltage, TFT1 and TFT2 are opened simultaneously, and making TFT3 and TFT4 be in closed condition, the corresponding gray scale voltage V1 of first output image signal that at this moment the GTG collecting voltage neutralized is applied to the first sub-pixel capacitor C s1 and the second sub-pixel capacitor C s2 simultaneously.

As shown in Figure 7, then apply grid and close voltage to gate lines G ate_n and Gate_n+1, and apply the grid cut-in voltage to second grid line TFT3_Gate_k, TFT3 is opened, and making TFT1, TFT2 and TFT4 be in closed condition, the corresponding gray scale voltage V2 of second output image signal that at this moment the GTG collecting voltage neutralized is applied to electric charge and shares capacitor C 3.Pairing gray scale voltage V1 of described first output image signal and the pairing gray scale voltage V2 of described second output image signal are unequal, in the present embodiment, first sub-pixel is made main display pixel, second sub-pixel is made less important display pixel, wherein said gray scale voltage V2 is less than described gray scale voltage V1, and the duration that correspondingly puts on second grid line TFT3_Gate_k cut-in voltage can be shorter than the duration that puts on gate lines G ate_n cut-in voltage.

As shown in Figure 8, apply the grid cut-in voltage to gate lines G ate_n+1 at last, close voltage and apply grid to gate lines G ate_n and second grid line TFT3_Gate_k, TFT4 is opened, and make TFT1, TFT2 and TFT3 be in closed condition, the electric charge of the shared capacitor C 3 of electric charge this moment and the second sub-pixel capacitor C s2 and liquid crystal capacitance is redistributed, voltage on the second sub-pixel capacitor C s2 is reduced to V1-△ V1 by V1, and the voltage on the first sub-pixel capacitor C s1 still is V1, thereby makes two sub-pixels have different voltage.

Fig. 9 is a driving sequential chart of the present utility model.See also Fig. 9, the 3rd thin film transistor (TFT) is later than first and second thin film transistor (TFT)s and opens, and is later than first and second thin film transistor (TFT)s and closes.When first and second thin film transistor (TFT)s are opened, the GTG collecting voltage corresponding gray scale voltage of first output image signal that neutralizes is applied to the first pixel electrode Pa and the second pixel electrode Pb, and the corresponding voltage of second output image signal that when the 3rd thin film transistor (TFT) is opened the GTG collecting voltage neutralized is applied to electric charge and shares capacitor C 3.

Figure 10 is the utility model pixel intensity composition principle figure.

See also Figure 10, show principle with the required brightness of gray scale voltage of synthetic 10 bits of the pairing brightness of the gray scale voltage of two 8 bits, the GTG of the GTG of 8 bits and 10 bits relatively in, the GTG label of 8 bits is respectively n-1, n, n+1 and n+2; The GTG that has in 10 bits and the GTG that can not represent in 8 bits is respectively na, nb and nc, the GTG na of 10 bits can be synthesized by n and n+1, and the like, therefore can show the color of greater number by the voltage of suitable synthetic two sub-pixels.

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 (2)

1, a kind of liquid crystal indicator comprises:

Many first grid polar curves;

Many second grid lines;

Many data lines;

And a plurality of pixels that in the zone of those first grid polar curves and those data lines intersection, are matrix distribution, each pixel comprises the first film transistor respectively, second thin film transistor (TFT), the 3rd thin film transistor (TFT), the 4th thin film transistor (TFT), first pixel electrode, second pixel electrode, electric charge is shared electric capacity;

Wherein, the first grid polar curve of transistorized grid of described the first film and current line links to each other, and source electrode links to each other with data line, and drain electrode links to each other with first pixel electrode; The first grid polar curve of the grid of described second thin film transistor (TFT) and current line links to each other, and source electrode links to each other with data line, and drain electrode links to each other with second pixel electrode; The second grid line of the grid of described the 3rd thin film transistor (TFT) and current line links to each other, and source electrode links to each other with data line, and drain electrode is shared electric capacity with electric charge and linked to each other; The first grid polar curve of the grid of described the 4th thin film transistor (TFT) and next line links to each other, and source electrode links to each other with second pixel electrode and the shared electric capacity of electric charge respectively with drain electrode.

2, liquid crystal indicator according to claim 1 is characterized in that, in each pixel, the area of the area of described first sub-pixel and described second sub-pixel differs from one another.

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