(19)
(11) EP 0 907 159 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
09.06.1999 Bulletin 1999/23

(43) Date of publication A2:
07.04.1999 Bulletin 1999/14

(21) Application number: 98110819.4

(22) Date of filing: 12.06.1998
(51) International Patent Classification (IPC)6: G09G 3/36
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 13.06.1997 JP 156900/97

(71) Applicant: MATSUSHITA ELECTRONIC COMPONENTS CO., LTD.
Kadoma-shi, Osaka (JP)

(72) Inventor:
  • Otani, Teruya
    Kanazawa-shi, Ishikawa 921-8034 (JP)

(74) Representative: Pellmann, Hans-Bernd, Dipl.-Ing. et al
Patentanwaltsbüro Tiedtke-Bühling-Kinne & Partner Bavariaring 4
80336 München
80336 München (DE)

   


(54) Active matrix liquid crystal display panel and method of driving the same


(57) Conventionally, a modulating voltage for modulating the potential of a pixel electrode through an auxiliary capacitance is superimposed on a scanning signal and applied to a scanning electrode. On the contrary, a modulating electrode for applying a modulating voltage is provided separately from the scanning electrode. Consequently, the amplitude of the scanning signal output from the output IC so as to be applied to the scanning electrode is greatly reduced and the level output is binary, so that the area of the IC chip is greatly reduced. As a result, the cost of the IC is greatly reduced. Moreover, since the modulating electrode is provided below the pixel electrode and no auxiliary capacitance is formed between the pixel electrode and the scanning electrode, the load capacitance of the scanning electrode is reduced, so that the width of the scanning electrode can be reduced to significantly improve the numerical aperture.






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