(19)
(11) EP 1 496 495 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION

(48) Corrigendum issued on:
16.03.2005 Bulletin 2005/11

(43) Date of publication:
12.01.2005 Bulletin 2005/02

(21) Application number: 04090270.2

(22) Date of filing: 05.07.2004
(51) International Patent Classification (IPC)7: G09G 3/32
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL HR LT LV MK

(30) Priority: 07.07.2003 KR 2003045610

(71) Applicant: Samsung SDI Co., Ltd.
Suwon-si, Gyeonggi-do (KR)

(72) Inventors:
  • Chung, Ho-Kyoon, c/o Samsung SDI Co., Ltd.
    Suwon-Si Gyeonggi-do (KR)
  • Kim, Yang-Wan, c/o Samsung SDI Co., Ltd.
    Suwon-Si Gyeonggi-do (KR)
  • Oh, Choon-Yul, c/o Samsung SDI Co., Ltd.
    Suwon-Si Gyeonggi-do (KR)
  • Kwon, Oh-Kyong, c/o Samsung SDI Co., Ltd.
    Suwon-Si Gyeonggi-do (KR)
  • Choi, Sang-Moo, c/o Samsung SDI Co., Ltd.
    Suwon-Si Gyeonggi-do (KR)

(74) Representative: Hengelhaupt, Jürgen, Dipl.-Ing. et al
Anwaltskanzlei Gulde Hengelhaupt Ziebig & Schneider Wallstrasse 58/59
10179 Berlin
10179 Berlin (DE)

   


(54) Organic light emitting device pixel circuit with self-compensation of threshold voltage and driving method therefor


(57) A pixel circuit in an organic light emitting device capable of realizing high gradation representation by self-compensating a threshold voltage, and a method for driving the same. The pixel drcuit includes an electroluminescent element for emitting light in response to an applied driving current. A first transistor delivers a data signal voltage in response to a current scan line signal. A second transistor generates a driving current to drive the electroluminescent element in response to the data signal voltage. A third transistor connects the second transistor in the form of a diode in response to a current scan signal to self-compensate the threshold voltage of the second transistor. A capacitor stores the data signal voltage delivered to the second transistor. A fourth transistor delivers a power supply voltage to the second transistor in response to a current light-emitting signal. A fifth transistor provides the driving current, provided from the second transistor, for the electroluminescent element in response to the current light-emitting signal.