US 2019/0295486 A1 · LIQUID CRYSTAL CONTROL CIRCUIT, ELECTRONIC TIMEPIECE, AND LIQUID CRYSTAL CONTROL METHOD

Abstract

A liquid crystal control circuit includes: a first terminal that outputs a rewriting signal for rewriting a plurality of pixels; a second terminal that periodically designates a start timing of the rewriting signal; a third terminal that outputs a polarity signal for designating polarity of AC voltage; a first circuit that identifies a next second inversion timing of any first inversion timing at which the polarity is inverted; a calculator that calculates a first start timing after the first inversion timing based on the start timing; a second circuit that determines whether the second inversion timing is within a period from a predetermined time before the first start timing to the first start timing; and an inversion unit that inverts polarity of the polarity signal after the rewriting signal starting from the first start timing is stopped, when the second inversion timing is within the period.

Claims8

Dependent claims

A liquid crystal control circuit connected between a liquid crystal display panel configured to apply AC voltage to a plurality of pixels and a controller, the liquid crystal control circuit comprising:

a rewriting signal output terminal that outputs a rewriting signal for rewriting the plurality of pixels to the liquid crystal display panel;
a timing input terminal that periodically designates a start timing of the rewriting signal;
a polarity signal output terminal that outputs a polarity signal for designating polarity of the AC voltage to the liquid crystal display panel;
a time measurement circuit that identifies a next second inversion timing of any first inversion timing at which the polarity is inverted;
a calculator that calculates a first start timing after the first inversion timing based on the start timing;
a determination circuit that determines whether the second inversion timing is within an inversion prohibition period from a predetermined time before the first start timing to the first start timing;
and
an inversion unit that inverts polarity of the polarity signal after the rewriting signal starting from the first start timing is stopped, when the determination circuit determines that the second inversion timing is within the inversion prohibition period.

5 more elements

Dependencies are inferred from the claim text.

Liquid crystal control circuit, electronic timepiece, and liquid crystal control method

Life of this patent

Liquid crystal control circuit, electronic timepiece, and liquid crystal control method

Life of this patent

Abstract

Claims8