US 6,184,853 B2Granted

Method of driving display device

AssigneeAlps Electric Co., Ltd.

InventorsHiroyuki Hebiguchi, Tatsumi Fujiyoshi

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Abstract

A driving method is provided in which power consumption is reduced in a driving circuit system and which does not cause a decrease in the image quality in a display device in which pixels which display one color by combining a plurality of basic colors are arrayed and matrix-driven. This method is used to drive a display device in which a large number of pixels which display a color by combining a plurality of basic colors are arrayed, the large number of pixels are matrix-driven by a large number of scanning lines and a large number of signal lines, the combination of the plurality of basic colors is repeatedly arrayed along the direction of each signal line, and the number of scanning lines is determined at a number such that the number of corresponding pixels arrayed along one signal line is multiplied by the number of basic colors, the method including the steps of: dividing one frame of pixel display information into fields of a number equal to or greater than the number of basic colors, and scanning a reduced number of the scanning lines and displaying the basic colors at the same rate within each field.

Claims6

Dependent claims

A method of driving a thin-film transistor liquid crystal display (TFT-LCD) device comprising pixels arranged in a matrix and containing dots of one of a plurality of basic colors such that each basic color is contained in each pixel, the basic colors being red (R), green (G), and blue (B), said dots being matrix-driven by scanning lines and signal lines, said dots arranged along each signal line and said pixels arranged repeatedly along said signal and scanning lines, each pixel having color filters covering each dot and forming an arrangement with a first sequence of R-G-B along each signal line and a second sequence of the same color along each scanning line, the arrangement of said color filters being the same in all said pixels, wherein the number of scanning lines is the number of pixels repeatedly arrayed along the signal lines multiplied by the number of basic colors, and the number of dots arrayed along each of the signal lines is the number of pixels arrayed along each of the signal lines multiplied by the number of basic colors, and the number of dots arrayed along each of the scanning lines is the number of pixels arranged along each of the scanning lines, wherein the TFT-LCD device has at least one gate driver with a plurality of gate outputs corresponding to the amount of scanning lines and at least one source driver with a plurality of source outputs corresponding to the amount of signal lines,

said method comprising:
dividing a frame of display information into a first field, a second field, and a third field, wherein the pixels in each field are classified in the signal line direction according to the progression of n, n+1, n+2, n+3, n+4, . . . , and n+m, where m is any integer greater than or equal to 5, where n is the first pixel in the scanning and signal lines;
and
sequentially driving the first, second, and third fields by scanning a reduced number of said scanning lines to display the frame according to the display information, wherein,
in the first field,
red scanning lines are scanned in pixels n and n+3,
green scanning lines are scanned in pixels n+1 and n+4,
blue scanning lines are scanned in pixels n+2 and n+5,
in the second field,
green scanning lines are scanned in pixels n and n+3,
blue scanning lines are scanned in pixels n+1 and n+4,
red scanning lines are scanned in pixels n+2 and n+5,
in the third field
blue scanning lines are scanned in pixels n and n+3,
red scanning lines are scanned in pixels n+1 and n+4,
green scanning lines are scanned in pixels n+2 and n+5, and
voltage polarity is reversed from one pixel to the next pixel along the signal lines and from one dot to the next dot along the scanning lines, wherein pixel n has positive voltage polarity.

14 more elements

A method of driving a thin-film transistor liquid crystal display (TFT-LCD) device comprising pixels arranged in a matrix and containing dots of one of a plurality of basic colors such that each basic color is contained in each pixel, the basic colors being red (R), green (G), and blue (B), said dots being matrix-driven by scanning lines and signal lines, said dots arranged along each signal line and said pixels arranged repeatedly along said signal and scanning lines, each pixel having color filters covering each dot and forming an arrangement having a first sequence of R-G-B along each signal line and a second sequence of the same color along each scanning line, the arrangement of said color filters being the same in all said pixels, wherein the number of scanning lines is the number of pixels repeatedly arrayed along the signal lines multiplied by the number of basic colors, and the number of dots arrayed along each of the signal lines is the number of pixels arrayed along each of the signal lines multiplied by the number of basic colors, and the number of dots arrayed along each of the scanning lines is the number of pixels arranged along each of the scanning lines, wherein the TFT-LCD device has at least one gate driver with a plurality of gate outputs corresponding to the amount of scanning lines and at least one source driver with a plurality of source outputs corresponding to the amount of signal lines,

said method comprising:
dividing a frame of display information into a first field, a second field, a third field, and a fourth field, wherein the scanning lines are divided into units along the signal line direction, each unit having four scanning lines, the units classified according to the progression of r, r+1, r+2, r+3, r+4, . . . , and r+m, where m is any integer greater than or equal to 5, where r is the first unit;
and
sequentially driving the first, second, third, and fourth fields by scanning a reduced number of said scanning lines to display the frame according to the display information, wherein,
in the first field,
red scanning lines are scanned in units r and r+3,
green scanning lines are scanned in units r+1 and r+4,
blue scanning lines are scanned in units r+2 and r+5,
in the second field,
green scanning lines are scanned in units r and r+3,
blue scanning lines are scanned in units r+1 and r+4,
red scanning lines are scanned in units r+2 and r+5,
in the third field,
blue scanning lines are scanned in units r and r+3,
red scanning lines are scanned in units r+1 and r+4,
green scanning lines are scanned in units r+2 and r+5, and
in the fourth field,
red scanning lines are scanned in units r and r+3,
green scanning lines are scanned in units r+1 and r+4,
blue scanning lines are scanned in units r+2 and r+5.

17 more elements

A method of driving a thin-film transistor liquid crystal display (TFT-LCD) device comprising pixels arranged in a matrix and containing dots of one of a plurality of basic colors such that each basic color is contained in each pixel, the basic colors being red (R), green (G), and blue (B), said dots being matrix-driven by scanning lines and signal lines, said dots arranged along each signal line and said pixels arranged repeatedly along said signal and scanning lines, each pixel having color filters covering each dot and forming an arrangement having a first sequence of R-G-B along each signal line and a second sequence of the same color along each scanning line, the arrangement of said color filters being the same in all said pixels, wherein the number of scanning lines is the number of pixels repeatedly arrayed along the signal lines multiplied by the number of basic colors, and the number of dots arrayed along each of the signal lines is the number of pixels arrayed along each of the signal lines multiplied by the number of basic colors, and the number of dots arrayed along each of the scanning lines is the number of pixels arranged along each of the scanning lines, wherein the TFT-LCD device has at least one gate driver with a plurality of gate outputs corresponding to the amount of scanning lines and at least one source driver with a plurality of source outputs corresponding to the amount of signal lines,

said method comprising:
dividing a frame of display information into a first field, a second field, a third field, a fourth field, and a fifth field, wherein the scanning lines are divided into units along the signal line direction, each unit having five scanning lines, the units classified according to the progression of s, s+1, s+2, s+3, . . . , s+m, where m is any integer greater than or equal to 4 where s is the first unit;
and
sequentially driving the first, second, third, fourth, and fifth fields by scanning a reduced number of said scanning lines to display the frame according to the display information, wherein,
in the first field,
red scanning lines are scanned in units s and s+3,
blue scanning lines are scanned in units s+1 and s+4,
green scanning lines are scanned in unit s+2,
in the second field,
green scanning lines are scanned in units s and s+3,
red scanning lines are scanned in units s+1 and s+4,
blue scanning lines are scanned in unit s+2,
in the third field,
blue scanning lines are scanned in units s and s+3,
green scanning lines are scanned in units s+1 and s+4,
red scanning lines are scanned in unit s+2,
in the fourth field,
red scanning lines are scanned in units s and s+3,
blue scanning lines are scanned in units s+1 and s+4,
green scanning lines are scanned in unit s+2, and
in the fifth field,
green scanning lines are scanned in units s and s+3,
red scanning lines are scanned in unit s+1,
blue scanning lines are scanned in unit s+2.

21 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/023,230Filed 12 Feb 1998
Priority: JP 9-02937713 Feb 1997
Granted: 6 Feb 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

G09G 3/3607
Using liquid crystals: for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
G09G 3/2003
For presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged…:…
G09G 3/3614
Control of matrices with row and column drivers: control of polarity reversal in general
G09G 3/3648
Control of matrices with row and column drivers: using an active matrix