Thin film transistor-liquid crystal display device and its driving method

Abstract

The invention discloses a TFT-LCD and its driving method, TFT-LCD comprises an array substrate and a color filter substrate, a common electrode on said color filter substrate being divided into multiple columns, each of which corresponding to one column of pixels; on color filter substrate, odd number columns are first common electrodes, even number columns are second common electrodes; difference between voltages input to said first common electrodes and said second common electrodes is larger than zero and less than dynamic range of driving voltage of liquid crystal driving voltage-transmittance curve. By setting two common electrode voltages, TFT-LCD and its driving method provided by the invention can make dynamic range of input voltage required for driving liquid crystal display device be smaller than dynamic range of driving voltage of liquid crystal driving voltage-transmittance curve, thus reducing power consumption during driving the liquid crystal.

1 . A thin film transistor-liquid crystal display device comprising an array substrate and a color filter substrate, wherein common electrodes on said color filter substrate form an array corresponding to pixels;
 on said color filter substrate, each of the common electrodes in an intersection of an odd number column and an odd number row of the array and each of the common electrodes in an intersection of an even number column and an even number row of the array are set as first common electrodes;   each of the common electrodes in an intersection of the odd number column and the even number row of the array and each of the common electrodes in an intersection of the even number column and the odd number row of the array are set as second common electrodes;   absolute difference between voltages input to said first common electrodes and said second common electrodes is larger than zero and less than a dynamic range of a driving voltage of a liquid crystal driving voltage-transmittance curve.   
     
     
         2 . A driving method for the thin film transistor-liquid crystal display device according to  claim 1 , wherein the driving method comprises:
 during the thin film transistor-liquid crystal display device displaying a frame, first common electrode voltage signal is input to said first common electrodes while second common electrode voltage signal is input to said second common electrodes; and a positive directional driving voltage signal of a first driving voltage-transmittance curve corresponding to said first common electrode voltage is input to odd number columns of data lines for the odd number rows and even number columns of data lines for the even number rows on said array substrate of said thin film transistor-liquid crystal display device, while a negative directional driving voltage signal of a second driving voltage-transmittance curve corresponding to said second common electrode voltage is input to even number columns of data lines for the odd number rows and odd number columns of data lines for the even number rows on said array substrate of said thin film transistor-liquid crystal display device;   during the thin film transistor-liquid crystal display device displaying a next adjacent frame, said second common electrode voltage signal is input to said first common electrodes while said first common electrode voltage signal is input to said second common electrodes; and said negative directional driving voltage signal of said second driving voltage-transmittance curve corresponding to said second common electrode voltage is input to the odd number columns of data lines for the odd number rows and the even number columns of data lines for the even number rows on said array substrate of said thin film transistor-liquid crystal display device, while said positive directional driving voltage signal of said first driving voltage-transmittance curve corresponding to said first common electrode voltage is input to the even number columns of data lines for the odd number rows and the odd number columns of data lines for the even number rows on said array substrate of said thin film transistor-liquid crystal display device.