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1. (WO2004023444) ELECTROLUMINESCENT DISPLAY DEVICES
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2004/023444 International Application No.: PCT/IB2003/003804
Publication Date: 18.03.2004 International Filing Date: 22.08.2003
IPC:
G09G 3/30 (2006.01) ,G09G 3/32 (2006.01)
G PHYSICS
09
EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
G
ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
3
Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
20
for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix
22
using controlled light sources
30
using electroluminescent panels
G PHYSICS
09
EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
G
ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
3
Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
20
for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix
22
using controlled light sources
30
using electroluminescent panels
32
semiconductive, e.g. diodes
Applicants:
KONINKLIJKE PHILIPS ELECTRONICS N.V. [NL/NL]; Groenewoudseweg 1 NL-5621 BA Eindhoven, NL (AllExceptUS)
FISH, David, A. [GB/GB]; GB (UsOnly)
CHILDS, Mark, J. [GB/GB]; GB (UsOnly)
Inventors:
FISH, David, A.; GB
CHILDS, Mark, J.; GB
Agent:
WILLIAMSON, Paul, L.; Philips Intellectual Property & Standards Cross Oak Lane Redhill, Surrey RH1 5HA, GB
Priority Data:
0220614.205.09.2002GB
Title (EN) ELECTROLUMINESCENT DISPLAY DEVICES
(FR) ECRANS ELECTROLUMINESCENTS
Abstract:
(EN) In an active matrix electroluminescent display device, a storage capacitor (24) is provided for storing a voltage to be used for addressing a drive transistor (22). A discharge photodiode (27) is provided for discharging the storage capacitor in dependence on the light output of the display element, and an input data voltage applied to the pixel is changed by an amount corresponding to the threshold voltage of the drive transistor. The changed data voltage is applied between the gate and source of the drive transistor. In this device the initial voltage on the gate of the drive transistor is modified so as to remove the dependency of the light output on the threshold voltage, so that threshold voltage variations can be tolerated.
(FR) Dans l'écran électroluminescent à matrice active selon l'invention, un condensateur de stockage (24) permet de stocker une tension destinée à être utilisée pour l'adressage d'un transistor d'attaque (22). Une photodiode de décharge (27) est utilisée pour décharger le condensateur de stockage en fonction de la lumière émise par l'élément d'affichage, et une tension de données de sortie appliquée sur le pixel est modifiée selon une quantité correspondant à la tension de seuil du transistor d'attaque. La tension de données modifiée est appliquée entre la grille et la source du transistor d'attaque. Dans ledit dispositif, la tension initiale sur la grille du transistor d'attaque est modifiée de manière à supprimer la dépendance de la lumière émise vis-à-vis de la tension de seuil, de sorte que des variations de tension de seuil peuvent être tolérées.
front page image
Designated States: AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, BZ, CA, CH, CN, CO, CR, CU, CZ, DE, DK, DM, DZ, EC, EE, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MA, MD, MG, MK, MN, MW, MX, MZ, NI, NO, NZ, OM, PG, PH, PL, PT, RO, RU, SC, SD, SE, SG, SK, SL, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, YU, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (GH, GM, KE, LS, MW, MZ, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HU, IE, IT, LU, MC, NL, PT, SE, SI, SK, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
KR1020050057100EP1537555JP2005538403US20050243031CN1679073AU2003255996