Real time active addressing display device and method utilizing fast walsh transform circuit

摘要

The device and method provide active-addressing drive signals foran LCD by utilizing an efficient implementation of Walsh functions. By implementation of a technique for determining fast Walsh transformations, real time active-addressing of the drive signals are provided by determining random access memory (RAM) addresses for sending preselected portions of the digital image data (PPDIDs) to a plurality of RAMs (106, 108, 110), and controlling simultaneous parallel input/output of data to/from the RAMs and a fast Walsh transform circuit (FWTC 102) such that fast Walsh transforms (FWTs) are performed on input digital image data. For example, active-addressing drive signals for one-half of a 240 by 640 column sized LCD may be determined in real time. Thus, two of the devices of the present invention may be utilized to provide a system for real time active-addressing for a typical visual graphics array (VGA) LCD.