Patent ID: 8184084

Claim:
An information system comprising: a central processing unit configured to output a video signal; a display panel; a memory configured to input and store said video signal as a digital video signal; a processing circuit configured to convert the resolution of said video signal to the resolution of said display panel, when the resolution of said video signal and the resolution of said display panel are different from each other; and a memory control circuit configured to synchronize outputs of a horizontal synchronous signal and a vertical synchronous signal of said digital video signal from said memory, respectively, with inputs of a horizontal synchronous signal and a vertical synchronous signal of said digital video signal into said memory, wherein frequencies of said horizontal synchronous signal of said digital video signal that is outputted from said memory are different from frequencies of said horizontal synchronous signal of said digital video signal that is inputted into said memory, when the resolution of said display panel is different from the resolution of said video signal.