Safe driving auxiliary device and method

The invention discloses a safe driving auxiliary device and method not only capable of realizing personalization but also capable of protecting privacy to the maximum extent. The safe driving auxiliary device is characterized in that all liquid crystal display glass installed on vehicle windows is mutually connected with a central controller; pattern display of liquid crystal on the glass of the vehicle windows is controlled through personalization setting; the light transmittance and the ambiguity of the liquid crystal glass of the vehicle windows are controlled through privacy protection setting; and road condition information all around a vehicle is displayed in real time through a driving auxiliary system so as to aid driving under a privacy protection mode that a visual field is blocked or under a privacy protection mode of ultimate all black. A vehicle speed signal and an ultimate all black authorization signal are used for controlling maximum privacy protection and maximum personalization under the condition that a front window is reasonable and legal. The safe driving auxiliary device disclosed by the invention can be used for ensuring the driving safety while protecting the privacy of passengers in the vehicle, meanwhile, also is capable of manifesting the personalization and meets ultimate pursuits of modern men on the personalization and the privacy protection.