Method of driving an image display device by driving display materials with alternating current

A method of driving a display device, the display device comprising plural picture-element electrodes disposed in a matrix form so as to define plural rows and columns, plural thin film transistors having drain, source and gate electrodes each connected to said picture-element electrodes, video signal wires and scanning signal wires, respectively, said video signal wires respectively connected to said columns of picture element electrodes through said plural thin film transistors and said scanning signal wires respectively connected to said rows of picture element electrodes through said plural thin film transistors, plural first wires which are commonly coupled with said picture-element electrodes of each row through a capacitance and running in parallel with said scanning signal wires, and counter electrodes disposed at a position counter to said picture-element electrodes across a display material, said display material being AC-driven, said method comprising:

• applying a scanning voltage to said scanning signal wires in succession to turn ON said thin-film transistors connected to each row of said picture element electrodes while said scanning voltage is applied to a corresponding scanning signal wire;
• applying a video signal voltage to said video signal wires for each column of said picture-element electrodes during a respective ON-period of each corresponding row of said thin film transistors;
• applying a first modulation signal having a polarity which is reversed every fixed period to said plural first wires at the same time;
• applying a second modulation signal having a polarity which is reversed every fixed period to said counter electrodes in synchronism with said first modulation signal to modulate potentials of said picture-element electrodes and to thereby apply an AC voltage to said display material.

A method of driving a display device, the display device comprising plural picture-element electrodes disposed in a matrix form so as to define plural rows and columns, plural thin film transistors having drain, source and gate electrodes each connected to said picture-element electrodes, video signal wires and scanning signal wires, respectively, said video signal wires respectively connected to said columns of picture element electrodes through said plural thin film transistors and said scanning signal wires respectively connected to said rows of picture element electrodes through said plural thin film transistors, said picture-element electrodes of a first row coupled through a capacitance with a first wire, said picture-element electrodes after said first row coupled through a capacitance with a scanning signal wire of a previous row of picture elements, and a counter electrode disposed at a position counter to said picture-element electrodes across a display material, said display material being AC-driven, said method comprising:

• applying a scanning voltage to said scanning signal wires in succession to turn ON said thin-film transistors connected to each row of said picture element electrodes while said scanning voltage is applied to a corresponding scanning signal wire;
• transmitting video signal voltages to said video signal wires for each column of said picture-element electrodes during a respective ON-period of each corresponding row of said thin film transistors;
• applying a second modulation signal having a polarity which is reversed every fixed period to said counter electrodes;
• applying a first modulation signal to said first wires and in duplication to said scanning signal wires during an OFF-period of said thin film transistors to modulate a potential of said picture-element electrode and to thereby apply a voltage to said display material.

A method of driving a display device, the display device including (a) a plurality of liquid crystal picture elements disposed in a matrix form so as to define plural rows and columns, each picture element having a picture element electrode and a counter common electrode, (b) a plurality of thin film transistors having drain, source and gate electrodes each connected to said picture element electrode, a video signal wire and a scanning signal wire respectively, said each video signal wire being connected to said picture element electrodes of each column through said thin film transistors, said each scanning signal wire being connected to said picture element electrodes of each row through said thin film transistors, (c) a plurality of capacitors respectively associated with each said picture element, one electrode of each said capacitor being coupled to said each picture element electrode of said associated picture element, the other electrodes of said capacitors of each row being commonly connected to said scanning signal wires of a previous row, said display device being AC-driven, said method comprising:

• applying a scanning voltage to said scanning signal wire to turn ON said thin film transistors connected to said picture element electrodes of each row;
• transmitting video signal voltages applied to said video signal wires of each column to said picture element electrodes of each row during a respective ON-period of each corresponding row of said thin film transistors;
• applying a first modulation signal to said scanning signal wires of a previous row in duplication, applying a second modulation signal having a polarity which is reversed every fixed period to said counter common electrodes of said picture elements to modulate a voltage applied to said picture elements.

A method of driving a display device, the display device including (a) a plurality of liquid crystal picture elements disposed in a matrix form so as to define plural rows and columns, each picture element having a picture element electrode and a counter common electrode, (b) a plurality of thin film transistors having drain, source and gate electrodes each connected to said picture element electrode, a video signal wire and a scanning signal wire respectively, said each video signal wire being connected to said picture element electrodes of each column through said thin film transistors, said each scanning signal wire being connected to said picture element electrodes of each row through said thin film transistors, (c) a plurality of capacitors respectively associated with each said picture element, one electrode of each said capacitor being coupled to said each picture element electrode of said associated picture element, the other electrodes of said capacitors of the first row being commonly connected to a first signal wire, the other electrodes of said capacitors after the first row being commonly connected with said scanning signal wires of a previous row, said display device being AC-driven, said method comprising:

• applying a scanning voltage to said scanning signal wire to turn ON the thin film transistors connected to said picture element electrodes of each row;
• transmitting video signal voltages applied to said video signal wires of each column to said picture element electrodes of each row during a respective ON-period of each corresponding row of said thin film transistors;
• applying a first modulation signal to said first signal wire and said scanning signal wires of a previous row in duplication, and applying a second modulation signal having a polarity which is reversed every fixed period to said counter common electrodes of said picture elements to modulate a voltage applied to said picture elements.