Patent ID: 7015882
Filing Date: 2006-03-21
Classification: G09G

Abstract:
1. An active-matrix display device comprising: a display section including a matrix of pixel circuits to which image information is given in the form of current, a plurality of scanning lines for selecting each pixel circuit, and a plurality of data lines for supplying each pixel circuit with the image information; and a driving circuit which holds the image information, and then writes the image information onto each pixel circuit by feeding the image information in the form of current to each of the plurality of data lines, wherein the driving circuit, arranged for every plural number of data lines, comprises a holding unit for holding the image information in the form of voltage, and a driving unit for supplying the image information in the form of current to each of the plurality of data lines after converting the voltage stored in the holding unit into the current, wherein the driving circuit comprises a converting unit which converts the image information supplied in the form of current into a voltage, and which holds the voltage converted by the converting unit in the holding unit, wherein the converting unit comprises a first field-effect transistor which generates a voltage between the gate and the source thereof by supplying the image information in the form of current when the drain and the gate thereof are electrically shorted, wherein the holding unit comprises a capacitor which holds the voltage generated between the gate and the source of the first field-effect transistor, and wherein the driving unit comprises a second field-effect transistor which drives each of the plurality of data lines based on the voltage held in the capacitor, wherein the driving circuit comprises a first switching element which connects and cuts a connection between a signal input line for receiving the image information and the first field-effect transistor, and a second switching element which connects and cuts a connection between the drain and the gate of the first field-effect transistor, and wherein when the image information is input, the first and second switching elements connect the respective connections thereof, and when the inputting of the image information ends, the second switching element cuts the connection thereof, followed by a connection cutting by the first switching element, wherein the driving circuit comprises a third field-effect transistor connected between the first switching element and the first field-effect transistor, a third switching element which connects and cuts a connection between the drain and the gate of the third field-effect transistor, and a second capacitor connected to the gate of the third field-effect transistor, and wherein when the drain and the gate of the first field-effect transistor are connected to each other by the second switch, and when the drain and the gate of the third field-effect transistor are connected to each other by the third switching element, the image information is fed in the form of current between the drain and the source of each of the first field-effect transistor and the third field-effect transistor via the first switching element.