EP 2628150 A1 20130821 - ACTIVE-MATRIX LIGHT-EMITTING DIODE DISPLAY SCREEN PROVIDED WITH ATTENUATION MEANS
Title (en)
ACTIVE-MATRIX LIGHT-EMITTING DIODE DISPLAY SCREEN PROVIDED WITH ATTENUATION MEANS
Title (de)
AKTIVMATRIX-LED-ANZEIGESCHIRM MIT DÄMPFUNGSVORRICHTUNGEN
Title (fr)
ECRAN D'AFFICHAGE A DIODES ELECTROLUMINESCENTES A MATRICE ACTIVE POURVU DE MOYENS D'ATTENUATION
Publication
Application
Priority
- FR 1004065 A 20101015
- EP 2011066523 W 20110922
Abstract (en)
[origin: WO2012049000A1] The application relates to active-matrix display screens with light-emitting diodes, and in particular with organic diodes (AM-OLED). The display screen comprises an active matrix of pixels, each pixel comprising a light-emitting diode, a control MOS transistor for applying a variable voltage or current to the anode of the diode, a selection transistor for applying to the gate of the transistor, during a phase of writing of this pixel, a variable analogue voltage (Vdat) representing a relative level of luminance of the pixel in the image, a storage capacitor for maintaining this voltage on the gate of the transistor outside of the writing phase. A circuit for attenuating mean luminance comprising a switch (SW) for periodically linking one of the electrodes, preferably the cathode, of the diode to one or the other of two fixed potentials (VkM, Vkoff), and a circuit (CTRL) for controlling the switch so as to perform the switching with a duty ratio which varies as a function of the desired attenuation, the switching occurring during the blanking times.
IPC 8 full level
G09G 3/32 (2006.01); G09G 3/20 (2006.01); H05B 44/00 (2022.01)
CPC (source: EP KR US)
G09G 3/20 (2013.01 - KR); G09G 3/2081 (2013.01 - EP US); G09G 3/32 (2013.01 - KR); G09G 3/3208 (2013.01 - EP US); G09G 3/3233 (2013.01 - US); G09G 2300/0866 (2013.01 - EP US); G09G 2320/0242 (2013.01 - EP US); G09G 2320/0626 (2013.01 - EP US)
Citation (search report)
See references of WO 2012049000A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
WO 2012049000 A1 20120419; EP 2628150 A1 20130821; EP 2628150 B1 20170419; FR 2966276 A1 20120420; FR 2966276 B1 20130308; JP 2013545126 A 20131219; JP 6214396 B2 20171018; KR 101958030 B1 20190313; KR 20130108581 A 20131004; US 2013208030 A1 20130815; US 9984618 B2 20180529
DOCDB simple family (application)
EP 2011066523 W 20110922; EP 11761344 A 20110922; FR 1004065 A 20101015; JP 2013533142 A 20110922; KR 20137009335 A 20110922; US 201113879405 A 20110922