Patent ID: 7576731

Claim:
An information processing apparatus comprising: a resistance film touch panel generating position coordinate data at a sampling interval; a liquid crystal display panel driven by a liquid crystal drive voltage; a first control circuit having a first generating circuit generating a horizontal synchronizing signal; a second generating circuit generating an alternating current signal that reverses polarity of said liquid crystal drive voltage based on said horizontal synchronizing signal, and a third generating circuit generating a noise warning signal based on said horizontal synchronizing signal, said noise warning signal indicating a time when the polarity of said liquid crystal drive voltage reverses; and a second control circuit changing said sampling interval based on said noise warning signal and detecting a position coordinate input from said resistance film touch panel at said changed sampling interval, wherein said second control circuit delays detecting the position coordinate input from said resistance film touch panel until said noise warning signal is deactivated from an active state that coincides with a timing for detecting the position coordinate.