Patent ID: 7623091

Claim:
A driving method of a display device for expressing gray scales with n bits (n is an integer) by dividing one frame into a plurality of subframes, comprising the steps of: classifying bits which represent the binary digits of gray scales into at least three kinds of bit groups comprising a first bit group, a second bit group, and a third bit group; dividing the one frame into two subframe groups; dividing a (a is an integer, where 0<a<n) subframes corresponding to the bits belonging to the first bit group into three or more; arranging the divided a subframes in the two subframe groups in roughly equal ratio; dividing b (b is an integer, where 0<b<n) subframes corresponding to the bits belonging to the second bit group into two; arranging the divided b subframes in the respective subframe groups one by one; and arranging c (c is an integer, where 0=c<n, and a+b+c=n) subframes corresponding to the bits belonging to the third bit group in at least one of the two subframe groups in one frame, wherein the arranging order of a plurality of subframes corresponding to the bits belonging to the first bit group, and the arranging order of a plurality of subframes corresponding to the bits belonging to the second bit group are about equal between the two subframe groups in one frame; wherein an overlapped time gray scale method is used for expressing gray scales in a part or all of the plurality of subframes corresponding to the bits belonging to the first bit group and the plurality of subframes corresponding to the bits belonging to the second bit group, in each of the two subframe groups in one frame; and wherein one gate selection period is divided into m (m is an integer, where m>1) periods or more, so that gate lines are independently scanned in each of the m divided gate selection periods.