Patent ID: 8944550
Filing Date: 2015-02-03
Classification: B41J,H03K

Abstract:
1. An element substrate including a plurality of printing elements to which a first voltage is applied, a plurality of driving elements provided in correspondence with the plurality of printing elements and configured to drive the plurality of printing elements, a plurality of logic circuits configured to generate, based on an externally input signal, a selection signal used to select and drive the plurality of printing elements, and a plurality of first level converters provided in correspondence with the plurality of logic circuits and configured to boost a logic voltage having a second voltage lower than the first voltage of the selection signal, comprising: a pad configured to externally receive a detection signal indicating detection of drop of the logic voltage; a second level converter configured to receive the detection signal via said pad and boost the detection signal; and a plurality of high voltage logic circuits provided in correspondence with the plurality of driving elements and the plurality of first level converters and configured to receive the boosted selection signals respectively output from the plurality of first level converters and the detection signal boosted by said second level converter, perform a logical operation of the boosted selection signals and the boosted detection signal and, output a result of the logical operation, and drive the plurality of driving elements, wherein when the detection signal is input, said plurality of high voltage logic circuits inhibit driving of the plurality of driving elements regardless of the boosted selection signals.