Patent ID: 8264470

Claim:
An information display device comprising: a display section; a touchscreen panel, which forms an integral part of the display section and which has an input area that is associated with the display area of the display section; an area locating section for determining, in response to a user's action on the input area, what partial area of the input area has been operated on as a result of the user's action, thereby generating a signal specifying that partial area; and a control section for instructing the display section to display a semitransparent pattern with some degree of transparency, wherein in a cleaning mode for cleaning the input area, the display section superimposes the pattern on an image that is presented on the display area thereof so that the image can still be seen to the user through the pattern, and the control section increases the degree of transparency of that pattern on the partial area in accordance with the signal specifying the partial area.