US 2002/0154104 A1 · Method for driving electrooptical device, driving circuit, and electrooptical device, and electronic apparatus

Abstract

In order to provide an electro-optical device capable of a high-quality and high-definition tone display, a driving method thereof, a driving circuit thereof, and electronic equipment using the electro-optical device, a driving method of an electro-optical device according to the present invention is characterized in that one field is divided into a plurality of sub-fields, such that each pixel is turned on or off in each of the sub-fields so that the proportion of the period during which each pixel is turned on to the period during which the associated pixel is turned off within the one field corresponds to the proportion according to the tone data, and when each pixel is turned on, either a first voltage which is higher than a constant reference voltage applied to a counter electrode or a second voltage which is lower than the reference voltage is applied to a pixel electrode of the associated pixel, and when the pixel is turned off, a voltage equal to the reference voltage is applied to the pixel electrode of the pixel.

Claims11

Dependent claims

A driving method of an electro-optical device for driving a plurality of pixels having pixel electrodes so as to be turned on or off according to tone data, the pixels being disposed at intersections between a plurality of data lines and a plurality of scanning lines, said driving method comprising:

applying a constant reference voltage to counter electrodes which oppose the pixels;
dividing one field into a plurality of sub-fields, such that a given pixel is turned on or off in each of the sub-fields so that the proportion of the period during which the pixel is turned on to the period during which the pixel is turned off within the one field corresponds to the proportion according to the tone data;
and
when the pixel is turned on, switching any one of a first voltage which is higher than the reference voltage and a second voltage which is lower than the reference voltage at a predetermined time interval to apply it to the pixel electrode of the pixel.

1 more element

A driving circuit of an electro-optical device for driving a plurality of pixels, having pixel electrodes and counter electrodes opposing the pixel electrodes and to which a constant reference voltage is applied, so as to be turned on or off according to tone data, the pixels being disposed at intersections between a plurality of data lines and a plurality of scanning lines, said driving circuit comprising:

a data converting circuit for generating a binary signal indicating that a given pixel is turned on or off in each of a plurality of sub-fields divided from each field, said data converting circuit generating the binary signal from the tone data in each sub-field per pixel so that the proportion of the period during which the pixel is turned on to the period during which the pixel is turned off within one field corresponds to the proportion according to the tone data;
and
a data line driving circuit for applying a voltage to turn on or off the pixel to the data lines according to the binary signal from said data converting circuit, and, when the pixel is turned on, for switching any one of a first voltage which is higher than the reference voltage and a second voltage which is lower than the reference voltage at a predetermined time interval to apply it to the data line to which the pixel is connected.

An electro-optical device comprising:

a plurality of pixels having pixel electrodes, which are disposed at intersections between a plurality of data lines and a plurality of scanning lines;
counter electrodes opposing the pixel electrodes and to which a constant reference voltage is applied;
a data converting circuit for generating a binary signal indicating to apply either voltage to turn on or off a given pixel in each of a plurality of sub-fields divided from each field, said data converting circuit generating the binary signal from tone data in each sub-field per pixel so that the proportion of the period during which the pixel is turned on to the period during which the pixel is turned off within one field corresponds to the proportion according to the tone data;
and
a data line driving circuit for applying a voltage to turn on or off the pixel to the data lines according to the binary signal from said data converting circuit, and, when a pixel is turned on, for switching any one of a first voltage which is higher than the reference voltage and a second voltage which is lower than the reference voltage at a predetermined time interval to apply it to the data line to which the pixel is connected.

2 more elements

Dependencies are inferred from the claim text.

Method for driving electrooptical device, driving circuit, and electrooptical device, and electronic apparatus

Life of this patent

Method for driving electrooptical device, driving circuit, and electrooptical device, and electronic apparatus

Life of this patent

Abstract

Claims11