(19)
(11) EP 1 724 752 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
08.08.2007 Bulletin 2007/32

(43) Date of publication A2:
22.11.2006 Bulletin 2006/47

(21) Application number: 06113510.9

(22) Date of filing: 04.05.2006
(51) International Patent Classification (IPC): 
G09G 3/36(2006.01)
G09G 3/22(2006.01)
 G09G 3/32(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK YU

(30) Priority: 17.05.2005 CN 200510070906

(71) Applicant: Harvatek Corporation
Hsin Chu City (TW)

(72) Inventors:
  • Wang, Bily
    Hsin Chu City (TW)
  • Lin, John
    Chia I Hsien (TW)

(74) Representative: Viering, Jentschura & Partner 
Postfach 22 14 43
80504 München
80504 München (DE)

   


(54) Pixel circuit for LCD and method of driving the same


(57) A pixel circuit (30) for an active matrix display (3) and the corresponding driving method are disclosed. The pixel circuit comprises a selection transistor (Q1), a first storage capacitor (C1), a synchronization unit (202), a second storage capacitor (C2) and a light emitting element (D). During a scan period, image data is written to the first capacitor (C1) where it is stored temporarily. Upon reception of a synchronization signal (CN1), the image data is transferred to the second capacitor (C2) and drives the light emitting element (D). Thus all tight emitting elements (D) are illuminated simultaneously. An additional transistor (Q2) may be provided for discharging the second capacitor (C2) and thereby erasing image data of the previous frame before starting a new light emission phase.










Search report