US 7,256,758 B2Granted

Apparatus and method of AC driving OLED

AssigneeAu Optronics Corporation

InventorsShuo-Hsiu Hu, Li-Wei Shih, Chiao-Ju Lin, Wen-Kuen Chen

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Abstract

An apparatus and method for providing switched power to an AMOLED is disclosed. During certain time intervals, voltage and/or polarity provided to active devices such as thin film transistors (TFT) driving the AMOLEDs may be changed to reverse polarity or differ in absolute magnitude of voltage. During a subsequent time interval, the changed power may be changed again and/or reverted to an original state. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.

Claims4

Dependent claims

A method of controlling an active matrix organic light emitting diode (AMOLED) display, comprising:

a. providing, by a power controller, of a first power source and a second power source, each power source adapted to power at least one of (i) an anode/cathode pair of a component of the AMOLED display or (ii) a source/drain pair of a transistor;
b. providing a first voltage having a predetermined polarity by the first power source;
c. providing a second voltage having a predetermined polarity by the second power source;
d. providing a start signal of a frame to a controller circuit operatively in communication with the power controller;
e. beginning a timer upon receipt of the start signal;
f. sending a first control signal by the controller circuit to the power controller upon lapse of a first predetermined time interval, the lapse being determined using the timer;
g. changing by the power controller, upon receipt of the control signal, of at least one of (i) the polarity of voltage of the first power source, (ii) the polarity of voltage of the second power source, (iii) the polarity of the voltage of both the first power source and the second power source, (iv) a magnitude of the first voltage, or (v) a magnitude of the second voltage.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/452,442Filed 2 Jun 2003
Published: US 2004/0239664 A12 Dec 2004
Granted: 14 Aug 2007
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

G09G 3/3208
Semiconductive, e.g. using light-emitting diodes [LED]: organic, e.g. using organic light-emitting diodes [OLED]
G09G 2310/0245
Details of the generation of driving signals: clearing or presetting the whole screen independently of waveforms, e.g. on power-on
G09G 2310/0254
Details of the generation of driving signals: control of polarity reversal in general, other than for liquid crystal displays
G09G 2310/0256
Control of polarity reversal in general, other than for liquid crystal displays: with the purpose of reversing the voltage across a light emitting…