Patent ID: 11869397
Assignee: ROHM CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. An abnormality detection circuit comprising:
a plurality of voltage dividing circuits;
a first selector configured to select and output one of a plurality of outputs of the plurality of voltage dividing circuits;
a first comparator configured to compare an output of the first selector with a reference voltage;
a first detector configured to detect an abnormality based on an output of the first comparator;
a recognizer configured to recognize a timing at which a combined value of a plurality of voltages output from a plurality of source channels of a liquid crystal display panel is changed by a predetermined amount or more in a period in which the plurality of source channels do not affect display of a liquid crystal display device including the liquid crystal display panel; and
a second detector configured to determine whether or not a pulse of a predetermined magnitude or more appears in a common voltage applied to a common electrode of the liquid crystal display panel at the timing recognized by the recognizer, and detect the abnormality based on a result of the determination,
wherein the selection of the first selector is switched in synchronization with a vertical synchronization signal or a horizontal synchronization signal of the liquid crystal display device.