Patent ID: 10600378

Abstract:
A liquid-crystal driving device is formed by integrating: an external output terminal to which a source line of an LCD panel is exteriorly connected; a first driver which generates a first source signal having three or more gradations (for example, 256 gradations) and outputs the first source signal to the external output terminal; an abnormality detection unit (a logic unit and an output monitor unit) which detects an abnormality in the first source signal; and a second driver which, when an abnormality in the first source signal is detected, generates a second source signa) having two gradations and outputs the second source signal to the external output terminal. The LCD panel is driven in a predetermined polarity inversion drive system, and the abnormality detection unit, for example, monitors polarity inversion of the first source signal in a fly-back period and detects an abnormality in the first source signal.