EP 1614091 A1 20060111 - CONTROL SYSTEM AND CONTROL METHOD FOR CHECKING THE FUNCTION OF LIQUID CRYSTAL DISPLAYS
Title (en)
CONTROL SYSTEM AND CONTROL METHOD FOR CHECKING THE FUNCTION OF LIQUID CRYSTAL DISPLAYS
Title (de)
KONTROLLSYSTEM UND KONTROLLVERFAHREN ZUM BERPR FEN DER FUNKTION VON LCD-ANZEIGEN
Title (fr)
SYSTEME DE VERIFICATION ET PROCEDE DE VERIFICATION POUR VERIFIER LE FONCTIONNEMENT D'AFFICHAGES A CRISTAUX LIQUIDES
Publication
Application
Priority
- EP 2004003277 W 20040327
- DE 10316901 A 20030412
Abstract (en)
[origin: WO2004090852A1] The invention relates to a method and a measuring system for checking the function of liquid crystal displays comprising individual display segments, on the basis of the difference in the electrical capacitance Cseg of defective and intact display segments. The invention is based on the fact that the capacitance of the display segments is directly determined by measuring the stored electrical charge using a capacitance measuring method. According to the preferred measuring method, a charge transfer is carried out by a reference capacitor Cref, and the segment capacitance Cseg is determined as a result of a charge balance, preferably by means of a DeltaSigma conversion.
IPC 1-7
IPC 8 full level
G01R 27/26 (2006.01); G01R 31/02 (2006.01); G01R 31/26 (2006.01); G01R 31/28 (2006.01); G02F 1/13 (2006.01); G09G 3/00 (2006.01); G09G 3/36 (2006.01); G09G 3/18 (2006.01)
CPC (source: EP US)
G09G 3/006 (2013.01 - EP US); G09G 3/3622 (2013.01 - EP US); G09G 3/18 (2013.01 - EP US); G09G 2320/029 (2013.01 - EP US)
Citation (search report)
See references of WO 2004090852A1
Citation (examination)
- US 2001030634 A1 20011018 - MORIWAKI HIROYUKI [JP]
- JORDAN J R ET AL: "A capacitance ratio to frequency ratio converter using switched-capacitor techniques", SENSORS AND ACTUATORS A, ELSEVIER SEQUOIA S.A., LAUSANNE, CH, vol. 29, no. 2, 1 November 1991 (1991-11-01), pages 133 - 139, XP026556613, ISSN: 0924-4247, [retrieved on 19911101], DOI: DOI:10.1016/0924-4247(91)87115-J
Designated contracting state (EPC)
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
DOCDB simple family (publication)
WO 2004090852 A1 20041021; CA 2521737 A1 20041021; DE 10316901 A1 20041028; EP 1614091 A1 20060111; JP 2006526164 A 20061116; US 2006279321 A1 20061214
DOCDB simple family (application)
EP 2004003277 W 20040327; CA 2521737 A 20040327; DE 10316901 A 20030412; EP 04723901 A 20040327; JP 2006504893 A 20040327; US 55254405 A 20051012