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1. US20170025064 - Active matrix organic light emitting diode display

Office États-Unis d'Amérique
Numéro de la demande 15283620
Date de la demande 03.10.2016
Numéro de publication 20170025064
Date de publication 26.01.2017
Numéro de délivrance 10089927
Date de délivrance 02.10.2018
Type de publication B2
CIB
G09G 3/30
GPHYSIQUE
09ENSEIGNEMENT; CRYPTOGRAPHIE; PRÉSENTATION; PUBLICITÉ; SCEAUX
GDISPOSITIONS OU CIRCUITS POUR LA COMMANDE DE L'AFFICHAGE UTILISANT DES MOYENS STATIQUES POUR PRÉSENTER UNE INFORMATION VARIABLE
3Dispositions ou circuits de commande présentant un intérêt uniquement pour l'affichage utilisant des moyens de visualisation autres que les tubes à rayons cathodiques
20pour la présentation d'un ensemble de plusieurs caractères, p.ex. d'une page, en composant l'ensemble par combinaison d'éléments individuels disposés en matrice
22utilisant des sources lumineuses commandées
30utilisant des panneaux électroluminescents
G09G 3/3233
GPHYSIQUE
09ENSEIGNEMENT; CRYPTOGRAPHIE; PRÉSENTATION; PUBLICITÉ; SCEAUX
GDISPOSITIONS OU CIRCUITS POUR LA COMMANDE DE L'AFFICHAGE UTILISANT DES MOYENS STATIQUES POUR PRÉSENTER UNE INFORMATION VARIABLE
3Dispositions ou circuits de commande présentant un intérêt uniquement pour l'affichage utilisant des moyens de visualisation autres que les tubes à rayons cathodiques
20pour la présentation d'un ensemble de plusieurs caractères, p.ex. d'une page, en composant l'ensemble par combinaison d'éléments individuels disposés en matrice
22utilisant des sources lumineuses commandées
30utilisant des panneaux électroluminescents
32semi-conducteurs, p.ex. utilisant des diodes électroluminescentes
3208organiques, p.ex. utilisant des diodes électroluminescentes organiques
3225utilisant une matrice active
3233avec un circuit de pixel pour commander le courant à travers l'élément électroluminescent
CPC
G09G 2300/0842
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2300Aspects of the constitution of display devices
08Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
0809Several active elements per pixel in active matrix panels
0842forming a memory circuit, e.g. a dynamic memory with one capacitor
G09G 2300/0861
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2300Aspects of the constitution of display devices
08Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
0809Several active elements per pixel in active matrix panels
0842forming a memory circuit, e.g. a dynamic memory with one capacitor
0861with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
G09G 2310/06
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2310Command of the display device
06Details of flat display driving waveforms
G09G 2320/0233
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2320Control of display operating conditions
02Improving the quality of display appearance
0233Improving the luminance or brightness uniformity across the screen
G09G 2320/0606
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2320Control of display operating conditions
06Adjustment of display parameters
0606Manual adjustment
G09G 2320/0626
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2320Control of display operating conditions
06Adjustment of display parameters
0626for control of overall brightness
Déposants HONEYWELL INTERNATIONAL INC.
Inventeurs Kalluri R. Sarma
Jerry A. Roush
John Schmidt
Mandataires Lorenz & Kopf, LLP
Titre
(EN) Active matrix organic light emitting diode display
Abrégé
(EN)

An improved AM OLED pixel circuit and method of wide dynamic range dimming for AM OLED displays are disclosed that maintain color balance throughout the dimming range, and also maintain the uniformity of the luminance and chromaticity of the display at low gray-levels as the display is dimmed to lower luminance values. As such, AM OLED displays can meet the stringent color/dimming specifications required for existing and future avionics, cockpit, and hand-held military device display applications. Essentially, the OLED pixel circuit and method of dimming that are disclosed use Pulse Width Modulation (PWM) of the OLED pixel current to achieve the desired display luminance. Two example circuits are disclosed that externally PW modulate the common cathode voltage or common power supply voltage to modulate the OLED current in order to achieve the desired display luminance. Three example circuits are disclosed that incorporate additional transistor switches in the pixel circuit to modulate the OLED current during the frame time. By PWM of the OLED current, in combination with data voltage (or current) modulation, wide dynamic range dimming can be achieved while maintaining the color balance and the luminance and chromaticity uniformity required over the surface of the display involved.