US 11,869,397 B2
Abnormality detection circuit
Akira Hashimoto, Kyoto (JP); Takateru Yamamoto, Kyoto (JP); Sukenori Ito, Kyoto (JP); and Yasunobu Inoue, Kyoto (JP)
Assigned to Rohm Co., Ltd., Kyoto (JP)
Filed by Rohm Co., Ltd., Kyoto (JP)
Filed on Dec. 16, 2022, as Appl. No. 18/083,028.
Application 17/370,301 is a division of application No. 16/517,923, filed on Jul. 22, 2019, granted, now 11,087,652, issued on Aug. 10, 2021.
Application 18/083,028 is a continuation of application No. 17/875,793, filed on Jul. 28, 2022, granted, now 11,620,926.
Application 17/875,793 is a continuation of application No. 17/370,301, filed on Jul. 8, 2021, granted, now 11,436,957, issued on Sep. 6, 2022.
Claims priority of application No. 2018-137846 (JP), filed on Jul. 23, 2018.
Prior Publication US 2023/0121542 A1, Apr. 20, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G09G 3/36 (2006.01); G02F 1/133 (2006.01); G09G 3/00 (2006.01)
CPC G09G 3/006 (2013.01) [G09G 3/3696 (2013.01); G09G 2330/12 (2013.01); G09G 2380/10 (2013.01)] 6 Claims
OG exemplary drawing
 
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.