Abnormality detection circuit
AssigneeRohm Co., Ltd.
InventorsAkira HASHIMOTO, Takateru YAMAMOTO, Sukenori ITO, Yasunobu Inoue
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Abstract
An abnormality detection circuit includes: 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; and a first detector configured to detect an abnormality based on an output of the first comparator, wherein the selection of the first selector is switched in synchronization with a vertical synchronization signal or a horizontal synchronization signal of a liquid crystal display device.
Claims11
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;
- and
- a first detector configured to detect an abnormality based on an output of the first comparator,
- wherein the selection of the first selector is switched in synchronization with a vertical synchronization signal or a horizontal synchronization signal of a liquid crystal display device.
An abnormality detection circuit comprising:
- a selector configured to select one source channel of a plurality of source channels of a liquid crystal display panel;
- a comparator configured to compare a voltage output from the one source channel selected by the selector with a threshold voltage set according to a display gradation of the one source channel selected by the selector;
- and
- a detector configured to detect an abnormality based on an output of the comparator,
- wherein the selection of the selector is switched in synchronization with a horizontal synchronization signal or a vertical synchronization signal of a liquid crystal display device.
An abnormality detection circuit comprising:
- 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 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 an abnormality based on a result of the determination.
Dependencies are inferred from the claim text.