Patent Publication Number: US-9905146-B2

Title: RGBW TFT LCD having reduced horizontal crosstalk

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to Chinese Patent Application No. 201510544424.9 filed on Aug. 31, 2015, the contents of which are incorporated by reference herein. 
     FIELD 
     The subject matter herein generally relates to a TFT LCD (thin film transistor liquid crystal display), and particularly to a TFT LCD having an RGBW (red, green, blue, white) TFT array substrate with a reduced horizontal crosstalk. 
     BACKGROUND 
     TFT LCDs have become the most popular flat displays since they have advantages of compactness, low heat generation, long life and visual comfort. In general a TFT LCD includes a backlight module, a first polarizer, a TFT array substrate, a liquid crystal layer, a color filter and a second polarizer. The TFT array substrate forms a plurality of pixels thereon. The liquid crystal layer contains a plurality liquid crystals therein. Originally, each pixel includes three sub-pixels, i.e., a red sub-pixel, a green sub-pixel, and a blue sub-pixel. 
     An RGBW ITT LCD is configured to have each pixel include a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel. A transparent area corresponding to the white sub-pixel is defined in the color filter, whereby a light transmittance of the color filter is improved, and the power consumption required by the backlight module can be reduced. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Many aspects of the disclosure can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being: placed upon clearly illustrating the principles of the disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views. 
         FIG. 1  is a diagram of a TFT array substrate of an RGBW TFT LCD in accordance with a first embodiment of the present disclosure. 
         FIG. 2  is a diagram showing a control sequence of scan lines of the TFT array substrate of  FIG. 1 . 
         FIG. 3  is a diagram of a TFT array substrate of an RGBW TFT LCD in accordance with a second embodiment of the present disclosure. 
         FIG. 4  is a diagram showing: a control sequence of scan lines of the TFT array substrate of  FIG. 3 . 
         FIG. 5  is a diagram of a TFT array substrate of an RGBW TFT LCD in accordance with a third embodiment of the present disclosure. 
         FIG. 6  is a diagram showing a control sequence of scan lines of the TFT array substrate of  FIG. 5 . 
     
    
    
     DETAILED DESCRIPTION 
     It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among the different figures to indicate corresponding or analogous elements. In addition, numerous specific details are set forth in order to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein can be practiced without these specific details. In other instances, methods, procedures, and components have not been described in detail so as not to obscure the related relevant feature being described. The drawings are not necessarily to scale and the proportions of certain parts may be exaggerated to better illustrate details and features. The description is not to be considered as limiting the scope of the embodiments described herein. 
     Several definitions that apply throughout this disclosure will now be presented. 
     The term “coupled” is defined as connected, whether directly or indirectly through intervening components, and is not necessarily limited to physical connections. The connection can be such that the objects are permanently connected or releasably connected. The term “substantially” is defined to be essentially conforming to the particular dimension, shape or other word that substantially modifies, such that the component need not be exact. For example, substantially cylindrical means that the object resembles a cylinder, but can have one or more deviations from a true cylinder. The term “comprising” means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in a so-described combination, group, series and the like. 
     Referring to  FIG. 1 , a circuit  31  of a TFT array substrate  30  of an RGBW TFT LCD in accordance with a first embodiment of the present disclosure is shown. The TFT substrate  30  of the RGBW TFT LCD can be used in a screen of a mobile phone for example a smart phone, a monitor of a computer, a screen of a laptop, a screen of a television set, or a screen of a tablet computer. The circuit  31  is arranged in a manner that it is driven by column inversion and includes a plurality of pixels  311  arranged in a matrix. Although  FIG. 1  shows that the pixels are arranged in three columns and four rows, it can be understood that the actual matrix number of the pixels  311  is far larger than 3×4, which can be, for example, 4096×2160 for a display of a 4K2K television, a kind of high definition (HD) television. Each pixel  311  consists of a red sub-pixel  312 , a green sub-pixel  314 , a blue sub-pixel  316  and a white sub-pixel  318 . The four sub-pixels  312 ,  314 ,  316 ,  318  are arranged in a substantially square matrix (i.e., 2×2 matrix) with the red and green sub-pixels  312 ,  314  arranged in a same row and the blue and white sub-pixels  316 ,  318  arranged in a neighboring same row, while the red and white sub-pixels  312 ,  318  arranged in a same column and the green and blue sub-pixels  314 ,  316  arranged in a neighboring same column. In their respective same row, the red and green sub-pixels  312 ,  314  are alternated, and the blue and white sub-pixels  316 ,  318  are alternated. In their respective same column, the red and white sub-pixels  312 ,  318  are alternated, and the green and blue sub-pixels  314 ,  316  are alternated. 
     Along the column direction (horizontal direction), two data lines  334 ,  336  are located between every two adjacent columns of the sub-pixels  312 ,  314 ,  316 ,  318  of a respective column of the pixels  311  and two other data lines  338 ,  332  are located between every two adjacent columns of the pixels  311 . A first scan line  320  is located between every two adjacent rows of the sub-pixels  312 ,  314 ,  316 ,  318  of a respective row of the pixel  311 . A second scan line  322  is located between every two adjacent rows of the pixels  311 . The first and second scan lines  320 ,  322  are orthogonal to and intersecting with the data lines  332 ,  334 ,  336 ,  338 . The data lines  332 ,  334 ,  336 ,  338  and the scan lines  320 ,  322  are electrically coupled to the sub-pixels  312 ,  314 ,  316 ,  318 . In the frame of  FIG. 1 , the data lines  332 ,  334 ,  336 ,  338  are applied with voltages having polarities of +, −, −, +, then −, +, +, −, and then a repeated pattern of the aforesaid polarities along a left to right direction of  FIG. 1 . 
     The red sub-pixel  312  of a first pixel  311 , for example, the pixel at a leftmost and topmost corner of the circuit  31  is electrically connected with the first scan line  320  immediately therebelow and the data line  336  adjacent thereto by a thin film transistor  313 . The thin film transistor  313  has a source electrode  3132  (for clarity labeled in another thin film transistor  313 ) in electrical coupling with the data line  336 , a gate electrode  3134  in electrical coupling with the first scan line  320  and a drain electrode  3136  in electrical coupling with a pixel electrode  3122  of the red sub-pixel  312 . The red sub-pixel  312  of a second pixel neighboring the first pixel and in the same row therewith is electrically connected with the first scan line  320  immediately therebelow and the data line  336  adjacent thereto by a corresponding thin film transistor. The red sub-pixels of the other pixels in the same row sequentially repeat the electrical connections of the red sub-pixels of the first and second pixels with the first scan line  320  and the data lines  336 . The red sub-pixel  312  of a third pixel neighboring the first pixel and in the same column therewith is electrically connected with the first scan line  320  immediately therebelow and the data line  336  adjacent thereto by a corresponding thin film transistor. The red sub-pixels of the other pixels in the same column sequentially repeat the electrical connections of the red sub-pixels of the first and third pixels with the first scan lines  320  and the data line  336 . 
     The green sub-pixel  314  of the first pixel  311  is electrically connected with the first scan line  320  immediately therebelow and the data line  332  adjacent thereto by a thin film transistor  315 . The thin film transistor  315  has a source electrode  3152  (for clarity labeled in another thin film transistor  315 ) in electrical coupling with the data line  332 , a gate electrode  3154  in electrical coupling with the first scan line  320  and a drain electrode  3156  in electrical coupling with a pixel electrode  3142  of the green sub-pixel  314 . The green sub-pixel  314  of the second pixel neighboring the first pixel and in the same row therewith is electrically connected with the first scan line  320  immediately therebelow and the data line  332  adjacent thereto by a corresponding thin film transistor. The green sub-pixels of the other pixels in the same row sequentially repeat the electrical connections of the green sub-pixels of the first and second pixels with the first scan line  320  and the data lines  332 . The green sub-pixel  314  of the third pixel neighboring the first pixel and in the same column therewith is electrically connected with the first scan line  320  immediately therebelow and the data line  332  adjacent thereto by a corresponding thin film transistor. The green sub-pixels of the other pixels in the same column sequentially repeat the electrical connections of the green sub-pixels of the first and third pixels with the first scan lines  320  and the data line  332 . 
     The blue sub-pixel  316  of the first pixel  311  is electrically connected with the second scan line  322  immediately therebelow and the data line  334  adjacent thereto by a thin film transistor  317 . The thin film transistor  317  has a source electrode  3172  (for clarity labeled in another thin film transistor  317 ) in electrical coupling with the data line  334 , a gate electrode  3174  in electrical coupling with the second scan line  322  and a drain electrode  3176  in electrical coupling with a pixel electrode  3162  of the blue sub-pixel  316 . The blue sub-pixel  316  of the second pixel neighboring the first pixel and in the same row therewith is electrically connected with the second scan line  322  immediately therebelow and the data line  334  adjacent thereto by a corresponding thin film transistor. The blue sub-pixels of the other pixels in the same row sequentially repeat the electrical connections of the blue sub-pixels of the first and second pixels with the second scan line  322  and the data lines  334 . The blue sub-pixel  316  of the third pixel neighboring the first pixel and in the same column therewith is electrically connected with the second scan line  322  immediately therebelow and the data line  334  adjacent thereto by a corresponding thin film transistor. The blue sub-pixels of the other pixels in the same column sequentially repeat the electrical connections of the blue sub-pixels of the first and third pixels with the second scan lines  322  and the data line  334 . 
     The white sub-pixel  318  of the first pixel  311  is electrically connected with the second scan line  322  immediately therebelow and the data line  338  adjacent thereto by a thin film transistor  319 . The thin film transistor  319  has a source electrode  3192  (for clarity labeled in another thin film transistor  319 ) in electrical coupling with the data line  338 , a gate electrode  3194  in electrical coupling with the second scan line  322  and a drain electrode  3196  in electrical coupling with a pixel electrode  3182  of the white sub-pixel  318 . The white sub-pixel  318  of the second pixel neighboring the first pixel and in the same row therewith is electrically connected with the second scan line  322  immediately therebelow and the data line  338  adjacent thereto by a corresponding thin film transistor. The white sub-pixels of the other pixels in the same row sequentially repeat the electrical connections of the white sub-pixels of the first and second pixels with the second scan line  322  and the data lines  338 . The white sub-pixel of the third pixel neighboring the first pixel and in the same column therewith is electrically connected with the second scan line  322  immediately therebelow and the data line  338  adjacent thereto by a corresponding thin film transistor. The white sub-pixels of the other pixels in the same column sequentially repeat the electrical connections of the white sub-pixels of the first and third pixels with the second scan lines  322  and the data line  338 . Since in this embodiment, the sub-pixels are driven by column inversion, along each of the data lines  332 ,  334 ,  336 ,  338 , the sub-pixels in electrical connection therewith have the same polarity. 
     In operation, in the frame shown in  FIG. 2 , the data lines  332 ,  334 ,  336 ,  338  for the sub-pixels in a pixel are supplied with voltages which have polarities opposite to the polarities of the voltages supplied to the sub-pixels of an immediately neighboring pixel in the same row, i.e., positive for the data lines  332 ,  338  and negative for the data lines  334 ,  336  for the first pixel and negative for the data lines  332 ,  338  and positive for the data lines  334 ,  336  for the second pixel. Thus, the red (green, blue, white) sub-pixel  312  ( 314 ,  316 ,  318 ) and a neighboring red (green, blue, white) sub-pixel in the same row have opposite polarities. The first and second scan lines  320 ,  322  are successively turned on along a top to bottom direction, wherein each time two respective first and second scan lines  320 ,  322  are turned on. In other words, the gates G 1 , G 2  of the thin film transistors in connection with the upmost first and second scan lines  320 ,  322  are firstly turned on; then the gates G 3 , G 4  are turned on, and so on. Accordingly when the RGBW TFT LCD having the TFT array substrate  30  is required to show a single color of one of the red, green, blue and white colors, the pixels  311  in two neighboring columns of a same row have opposite polarities, i.e., one being positive and the other being negative. By such arrangement, the coupling effects caused by capacitors (Cscs) of each two neighboring columns of the pixels  311  on the waveform of a common electrode (Com) can offset from each other to obviate the horizontal crosstalk, wherein the capacitor (Csc) is a capacitor interconnecting a corresponding data line and the common electrode (Com) for supplying a bias across a liquid crystal layer. 
     Referring to  FIG. 3 , a circuit  34  of the TFT array substrate  30  of the RGBW TFT LCD in accordance with a second embodiment of the present disclosure is shown. The circuit  34  is arranged in a manner that it is driven by column inversion and includes a plurality of pixels  341  arranged in a matrix. Although  FIG. 3  shows that the pixels  341  are arranged in three columns and four rows, it can be understood that the actual matrix number of the pixels  341  is far larger than 3×4, which can be, for example, 4096×2160 for a display of a 4K2K television which is a kind of high definition (HD) television. Each pixel  341  consists of a red sub-pixel  342 , a green sub-pixel  344 , a blue sub-pixel  346  and a white sub-pixel  348 . The four sub-pixels  342 ,  344 ,  346 ,  348  are arranged in a substantially square matrix (for example, 2×2 matrix) with the red and green sub-pixels  342 ,  344  arranged in a same row and the blue and white sub-pixels  346 ,  348  arranged in a neighboring same row, while the red and white sub-pixels  342 ,  348  arranged in a same column and the green and blue sub-pixels  344 ,  346  arranged in a neighboring same column. In their respective same row, the red and green sub-pixels  342 ,  344  are alternated, and the blue and white sub-pixels  346 ,  348  are alternated. In their respective same column, the red and white sub-pixels  342 ,  348  are alternated, and the green and blue sub-pixels  344 ,  346  are alternated. 
     Along the column direction (horizontal direction), two data lines  364 ,  366  are located between every two adjacent columns of the sub-pixels  342 ,  344 ,  346 ,  348  of a respective column of the pixels  341  and two other data lines  368 ,  362  are located between every two adjacent columns of the pixels  341 . A first scan line  350  is located between every two adjacent rows of the sub-pixels  342 ,  344 ,  346 ,  348  of a respective row of the pixels  341 . A second scan line  352  is located between every two adjacent rows of the pixels  341 . The first and second scan lines  350 ,  352  are orthogonal to and intersecting with the data lines  362 ,  364 ,  366 ,  368 . The data lines  362 ,  364 ,  366 ,  368  and the scan lines  350 ,  352  are electrically coupled to the sub-pixels  342 ,  344 ,  346 ,  348 . In the frame of  FIG. 3 , the data lines  362 ,  364 ,  366 ,  368  are applied with voltages having polarities of +, −, +, −. 
     The red sub-pixel  342  of a first pixel  341 , i.e., the pixel at a leftmost and topmost corner of the circuit  34  is electrically connected with the first scan line  350  immediately therebelow and the data line  368  adjacent thereto by a thin film transistor  343 . The thin film transistor  343  has a source electrode in electrical coupling with the data line  368 , a gate electrode in electrical coupling with the first scan line  350  and a drain electrode in electrical coupling with a pixel electrode of the red sub-pixel  342 . The red sub-pixel  342  of a second pixel neighboring the first pixel and in the same row therewith is electrically connected with the first scan line  350  immediately therebelow and the data line  366  adjacent thereto by a corresponding thin film transistor. The red sub-pixels of the other pixels in the same row sequentially repeat the electrical connections of the red sub-pixels of the first and second pixels with the first scan line  350  and the data lines  368 ,  366 , respectively. The red sub-pixel of a third pixel neighboring the first pixel and in the same column therewith is electrically connected with the first scan line  350  immediately therebelow and the data line  366  adjacent thereto by a corresponding thin film transistor. The red sub-pixels of the other pixels in the same column sequentially repeat the electrical connections of the red sub-pixels of the first and third pixels with the first scan lines  350  and the data line  366 . 
     The green sub-pixel  344  of the first pixel  341  is electrically connected with the first scan line  350  immediately therebelow and the data line  362  adjacent thereto by a thin film transistor  345 . The thin film transistor  345  has a source electrode in electrical coupling with the data line  362 , a gate electrode in electrical coupling with the first scan line  350  and a drain electrode in electrical coupling with a pixel electrode of the green sub-pixel  344 . The green sub-pixel  344  of the second pixel neighboring the first pixel and in the same row therewith is electrically connected with the first scan line  350  immediately therebelow and the data line  364  adjacent thereto by a corresponding thin film transistor. The green sub-pixels of the other pixels in the same row sequentially repeat the electrical connections of the green sub-pixels of the first and second pixels with the first scan line  350  and the data lines  362 ,  364 , respectively. The green sub-pixel of the third pixel neighboring the first pixel and in the same column therewith is electrically connected with the first scan line  350  immediately therebelow and the data line  362  adjacent thereto by a corresponding thin film transistor. The green sub-pixels of the other pixels in the same column sequentially repeat the electrical connections of the green sub-pixels of the first and third pixels with the first scan lines  350  and the data line  362 . 
     The blue sub-pixel  346  of the first pixel  341  is electrically connected with the second scan line  352  immediately therebelow and the data lines  364  adjacent thereto by a thin film transistor  347 . The thin film transistor  347  has a source electrode in electrical coupling with the data line  364 , a gate electrode in electrical coupling with the second scan line  352  and a drain electrode in electrical coupling with a pixel electrode of the blue sub-pixel  346 . The blue sub-pixel of the second pixel neighboring the first pixel and in the same row therewith is electrically connected with the second scan line  352  immediately therebelow and the data line  362  adjacent thereto by a corresponding thin film transistor. The blue sub-pixels of the other pixels in the same row sequentially repeat the electrical connections of the blue sub-pixels of the first and second pixels with the second scan line  352  and the data lines  364 ,  362 , respectively. The blue sub-pixel of the third pixel neighboring the first pixel and in the same column therewith is electrically connected with the second scan line  352  immediately therebelow and the data line  364  adjacent thereto by a corresponding thin film transistor. The blue sub-pixels of the other pixels in the same column sequentially repeat the electrical connections of the blue sub-pixels of the first and third pixels with the second scan lines  352  and the data line  364 . 
     The white sub-pixel  348  of the first pixel  341  is electrically connected with the second scan line  352  immediately therebelow and the data line  366  adjacent thereto by a thin film transistor  349 . The thin film transistor  349  has a source electrode in electrical coupling with the data line  366 , a gate electrode in electrical coupling with the second scan line  352  and a drain electrode in electrical coupling with a pixel electrode of the white sub-pixel  348 . The white sub-pixel of the second pixel neighboring the first pixel and in the same row therewith is electrically connected with the second scan line  352  immediately therebelow and the data line  368  adjacent thereto by a corresponding thin film transistor. The white sub-pixels of the other pixels in the same row sequentially repeat the electrical connections of the white sub-pixels of the first and second pixels with the second scan line  352  and the data lines  366 ,  368 , respectively. The white sub-pixel of the third pixel neighboring the first pixel and in the same column therewith is electrically connected with the second scan line  352  immediately therebelow and the data line  366  adjacent thereto by a corresponding thin film transistor. The white sub-pixels of the other pixels in the same column sequentially repeat the electrical connections of the white sub-pixels of the first and third pixels with the second scan lines  352  and the data line  366 . Since in this embodiment, the sub-pixels are driven by column inversion, along each of the data lines  362 ,  364 ,  366 ,  368  the sub-pixels in electrical connection therewith have the same polarity. 
     In operation, in the frame shown in  FIG. 4 , the data lines  362 ,  364 ,  366 ,  368  are alternately supplied with positive voltage (for data lines  362 ,  366 ) and negative voltage (for data lines  364 ,  368 ), whereby the red (green, blue, white) sub-pixel  342  ( 344 ,  346 ,  348 ) and a neighboring red (green, blue, white) sub-pixel in the same row have opposite polarities. The first and second scan lines  350 ,  352  are successively turned on along a top to bottom direction, wherein each time two respective first and second scan lines  350 ,  352  are turned on. In other words, the gates G 1 , G 2  of the thin film transistors in connection with the upmost first and second scan lines  350 ,  352  are firstly turned on; then the gates G 3 , G 4  are turned on, and so on. Accordingly when the RGBW TFT LCD having the TFT substrate  30  is required to show a single color of one of the red, green, blue and white colors, the pixels  341  in two neighboring columns have opposite polarities, i.e., one being positive and the other being negative. By such arrangement, the coupling effects caused by capacitors (Cscs, not shown) of each two neighboring columns of the pixels  341  on the waveform of a common electrode (Com, not shown) can offset from each other to obviate the horizontal crosstalk, wherein the capacitor (Csc) is a capacitor interconnecting a corresponding data line and the common electrode (Com) for supplying a bias across a liquid crystal layer (not shown). The common electrode (Com) and the capacitors (Cscs) are well known by those skilled in the art; detailed descriptions thereof are omitted here. 
     Referring to  FIG. 5 , a circuit  37  of the TFT array substrate  30  of the RGBW TFT LCD in accordance with a third embodiment of the present disclosure is shown. The circuit  37  is arranged in a manner that it is driven by column inversion and includes a plurality of pixels  371  arranged in a matrix. Although  FIG. 5  shows that the pixels  371  are arranged in three columns and four rows, it can be understood that the actual matrix number of the pixels  371  is far larger than 3×4, which can be, for example, 4096×2160 for a display of a 4K2K television, a kind of high definition (HD) television. Each pixel  371  consists of a red sub-pixel  372 , a green sub-pixel  374 , a blue sub-pixel  376  and a white sub-pixel  378 . The four sub-pixels  372 ,  374 ,  376 ,  378  are arranged in a substantially square matrix (i.e., 2×2 matrix) with the red and green sub-pixels  372 ,  374  arranged in a same row and the blue and white sub-pixels  376 ,  378  arranged in a neighboring same row, while the red and white sub-pixels  372 ,  378  arranged in a same column and the green and blue sub-pixels  374 ,  376  arranged in a neighboring same column. In their respective same row, the red and green sub-pixels  372 ,  374  are alternated, and the blue and white sub-pixels  376 ,  378  are alternated. In their respective same column, the red and white sub-pixels  372 ,  378  are alternated, and the green and blue sub-pixels  374 ,  376  are alternated. 
     Along the column direction (horizontal direction), two data lines  394 ,  396  are located between every two adjacent columns of the sub-pixels  372 ,  374 ,  376 ,  378  of a respective column of the pixels  371  and two other data lines  398 ,  392  are located between every two adjacent columns of the pixels  371 . A first scan line  380  is located between every two adjacent rows of the sub-pixels  372 ,  374 ,  376 ,  378  of a respective row of the pixels  371 . A second scan line  382  is located between every two adjacent rows of the pixels  371 . The first and second scan lines  380 ,  382  are orthogonal to and intersecting with the data lines  392 ,  394 ,  396 ,  398 . The data lines  392 ,  394 ,  396 ,  398  and the scan lines  380 ,  382  are electrically coupled to the sub-pixels  372 ,  374 ,  376 ,  378 . In the frame of  FIG. 5 , the data lines  392 ,  394 ,  396 ,  398  are applied with voltages having polarities of +, −, −, +. 
     The red sub-pixel  372  of a first pixel  371 , i.e., the pixel at a leftmost and topmost corner of the circuit  37  is electrically connected with the first scan line  380  immediately therebelow and the data line  396  adjacent thereto by a thin film transistor  373 . The thin film transistor  373  has a source electrode in electrical coupling with the data line  396 , a gate electrode in electrical coupling with the first scan line  380  and a drain electrode in electrical coupling with a pixel electrode of the red sub-pixel  372 . The red sub-pixel  372  of a second pixel neighboring the first pixel and in the same row therewith is electrically connected with the first scan line  380  immediately therebelow and the data line  398  adjacent thereto by a corresponding thin film transistor. Then the red sub-pixels of the other pixels in the same row sequentially repeat the electrical connections of the red sub-pixels of the first and second pixels with the first scan line  380  and the data lines  396 ,  398 , respectively. The red sub-pixel of a third pixel neighboring the first pixel and in the same column therewith is electrically connected with the first scan line  380  immediately therebelow and the data line  396  adjacent thereto by a corresponding thin film transistor. Then the red sub-pixels of the other pixels in the same column sequentially repeat the electrical connections of the red sub-pixels of the first and third pixels with the first scan lines  380  and the data line  396 . 
     The green sub-pixel  374  of the first pixel  371  is electrically connected with the first scan line  380  immediately therebelow and the data line  392  adjacent thereto by a thin film transistor  375 . The thin film transistor  375  has a source electrode in electrical coupling with the data line  392 , a gate electrode in electrical coupling with the first scan line  380  and a drain electrode in electrical coupling with a pixel electrode of the green sub-pixel  374 . The green sub-pixel  374  of the second pixel neighboring the first pixel and in the same row therewith is electrically connected with the first scan line  380  immediately therebelow and the data line  394  adjacent thereto by a corresponding thin film transistor. Then the green sub-pixels of the other pixels in the same row sequentially repeat the electrical connections of the green sub-pixels of the first and second pixels with the first scan line  380  and the data lines  392 ,  394 , respectively. The green sub-pixel of the third pixel neighboring the first pixel and in the same column therewith is electrically connected with the first scan line  380  immediately therebelow and the data line  392  adjacent thereto by a corresponding thin film transistor. Then the green sub-pixels of the other pixels in the same column sequentially repeat the electrical connections of the green sub-pixels of the first and third pixels with the first scan lines  380  and the data line  392 . 
     The blue sub-pixel  376  of the first pixel  371  is electrically connected with the second scan line  382  immediately therebelow and the data lines  394  adjacent thereto by a thin film transistor  377 . The thin film transistor  377  has a source electrode in electrical coupling with the data line  394 , a gate electrode in electrical coupling with the second scan line  382  and a drain electrode in electrical coupling with a pixel electrode of the blue sub-pixel  376 . The blue sub-pixel of the second pixel neighboring the first pixel and in the same row therewith is electrically connected with the second scan line  382  immediately therebelow and the data line  392  adjacent thereto by a corresponding thin film transistor. Then the blue sub-pixels of the other pixels in the same row sequentially repeat the electrical connections of the blue sub-pixels of the first and second pixels with the second scan line  382  and the data lines  394 ,  392 , respectively. The blue sub-pixel of the third pixel neighboring the first pixel and in the same column therewith is electrically connected with the second scan line  382  immediately therebelow and the data line  394  adjacent thereto by a corresponding thin film transistor. Then the blue sub-pixels of the other pixels in the same column sequentially repeat the electrical connections of the blue sub-pixels of the first and third pixels with the second scan lines  382  and the data line  394 . 
     The white sub-pixel  378  of the first pixel  371  is electrically connected with the second scan line  382  immediately therebelow and the data line  398  adjacent thereto by a thin film transistor  379 . The thin film transistor  379  has a source electrode in electrical coupling with the data line  398 , a gate electrode in electrical coupling with the second scan line  382  and a drain electrode in electrical coupling with a pixel electrode of the white sub-pixel  378 . The white sub-pixel of the second pixel neighboring the first pixel and in the same row therewith is electrically connected with the second scan line  382  immediately therebelow and the data line  396  adjacent thereto by a corresponding thin film transistor. Then the white sub-pixels of the other pixels in the same row sequentially repeat the electrical connections of the white sub-pixels of the first and second pixels with the second scan line  382  and the data lines  398 ,  396 , respectively. The white sub-pixel of the third pixel neighboring the first pixel and in the same column therewith is electrically connected with the second scan line  382  immediately therebelow and the data line  398  adjacent thereto by a corresponding thin film transistor. Then the white sub-pixels of the other pixels in the same column sequentially repeat the electrical connections of the white sub-pixels of the first and third pixels with the second scan lines  382  and the data line  398 . Since in this embodiment, the sub-pixels are driven by column inversion, along each of the data lines  392 ,  394 ,  396 ,  398  the sub-pixels in electrical connection therewith have the same polarity. 
     In operation, in the frame shown in  FIG. 6 , the data lines  392 ,  398  each are supplied with a positive voltage while the data lines  394 ,  396  each are supplied with a negative voltage, whereby the red (green, blue, white) sub-pixel  372  ( 374 ,  376 ,  378 ) and a neighboring red (green, blue, white) sub-pixel in the same row have opposite polarities. The first and second scan lines  380 ,  382  are successively turned on along a top to bottom direction, wherein each time two respective first and second scan lines  380 ,  382  are turned on. In other words, the gates G 1 , G 2  of the thin film transistors in connection with the upmost first and second scan lines  380 ,  382  are firstly turned on; then the gates G 3 , G 4  are turned on, and so on. Accordingly when the RGBW TFT LCD having the TFT substrate  30  is required to show a single color of one of the red, green, blue and white colors, the pixels  371  in two neighboring columns have opposite polarities, i.e., one being positive and the other being negative. By such arrangement, the coupling effects caused by capacitors (Cscs, not shown) of each two neighboring columns of the pixels  371  on the waveform of a common electrode (Com, not shown) can offset from each other to obviate the horizontal crosstalk, wherein the capacitor (Csc) is a capacitor interconnecting a corresponding data line and the common electrode (Com) for supplying a bias across a liquid crystal layer (not shown). The common electrode (Com) and the capacitors (Cscs) are well known by those skilled in the art; detailed descriptions thereof are omitted here. 
     The embodiments shown and described above are only examples. Even though numerous characteristics and advantages of the present technology have been set forth in the foregoing description, together with details of the structure and function of the present disclosure, the disclosure is illustrative only, and changes may be made in the detail, including in particular the matters of shape, size and arrangement of parts within the principles of the present disclosure, up to and including the full extent established by the broad general meaning of the terms used in the claims.