LG Electronics Inc. on Thursday accused Samsung Display Co. and Samsung Electronics Co. of illegally using its technology and demanded the two companies pay for the patents, the latest development in the Samsung-LG display feud. Samsung Display and LG Display Co., the world\'s two biggest display makers, have been embroiled in a patent tussle over organic light-emitting diode (OLED) and liquid crystal display (LCD) technologies that later expanded to their TV-making affiliates Samsung Electronics and LG Electronics.