US Patent 7256777 LCD driver power saving during evaluation

This invention provides a method and an apparatus for saving power dissipation during the testing and evaluation of liquid crystal display LCD panels. In addition, this invention provides a method and apparatus of the changing of the order of backplane and segment addressing to reduce the power consumed by LCD panels. The method includes the step of interlacing the access of common or backplane addresses to an LCD. The LCD power saving method also includes the interlacing the access of the RAM data driving the LCD segment drivers. The segment address signals are developed from data read out of a random access memory, RAM. The segment address signals are activated such that alternating LCD panel locations are written with ones and zeros in a checkerboard pattern so as to stress the LCD panel in the worst case. This method provides for the saving of power dissipation during testing and evaluation by reducing the amount of segment switching from once every backplane cycle to once every frame.