Patent ID: 7180521

Claim:
An accessing method of a frame memory integrated within a display panel driver driving a display panel driven by a sub-field addressing method in which one frame of video data is divided into P sub-fields each consisting of N pixel lines and each of said of N pixel lines having a pixel data set, said accessing method comprising: performing a plurality of write operations for sequentially writing a plurality of pixel data sets into said frame memory such that pixel data sets on m-th line (1≦m≦N−1) are sequentially written in order of said P sub-fields from a first sub-field to a last sub-field, and then when a pixel data set at said last sub-field has been written, pixel data sets on (m+1)-th line are sequentially written in order of said P sub-fields from a first sub-field to a last sub-field; and performing a plurality of read operations for sequentially reading a plurality of pixel data sets from said frame memory such that pixel data sets on q-th sub-field (1≦q≦P−1) are sequentially read in order of said N pixel lines from a first pixel line to a last pixel line, and then when a pixel data set at said last pixel line has been read, pixel data sets on (p+1)-th sub-field are sequentially read in order of said N pixel lines from a first pixel line to a last pixel line, wherein at least two of said write operations are allowed to be performed between adjacent two of said read operations.