Method of driving an active matrix electro-luminescent display

• US 20020089474A1
• Filed: 12/27/2001
• Published: 07/11/2002
• Est. Priority Date: 01/08/2001
• Status: Active Grant

• Current Assignee: InnoLux Corporation
• Original Assignee: Chi Mei Optoelectronics (InnoLux Corporation), Kyocera Corporation
• Inventors: Wu, Biing-Seng
• Granted Patent: US 6,710,757 B2
• Time in Patent Office: Days
• US Class Current: 345/76
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2310/0251 Precharge or discharge of pixel before applying new pixel voltage
• CPC Class Codes: G09G 2310/061 for resetting or blanking
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element

Abstract

A method of driving an AMEL display. The AMEL display includes a pixel having a first transistor, a second transistor, a capacitor, and an organic light emitting diode (O-LED). A frame time interval for the invention includes at least a first sub-interval and a second sub-interval. The method includes the following steps. First, during the first sub-interval, apply a first pulse to the scan lines sequentially and apply corresponding data signals to the data lines. Next, during the second sub-interval, apply a second pulse to the scan lines sequentially so as to turn on the first transistors and apply a prevention signal to the data lines so as to turn off the corresponding second transistors.

Claims

1. A method of driving an active matrix electro-luminescent (AMEL) display, wherein the AMEL display comprises M scan lines, N data lines, and M×

N pixels, the M×

N pixels are capable of displaying a video signal comprising a plurality of consecutive frames, a frame time interval is required for displaying one frame, the frame time interval comprises at least a first sub-interval and a second sub-interval, and the M×

N pixels comprise a pixel (p, q), wherein p is a positive integer not greater than M and q is a positive integer not greater than N, and the pixel (p, q) comprises;

a first transistor, having a source/drain terminal coupled to the q-th data line and a gate terminal coupled to the p-th scan line;

a second transistor, coupled to the first transistor, wherein when a first pulse is applied to the p-th scan line, the first transistor turns on and transmits a data signal on the q-th data line to the gate of the second transistor, wherein the data signal determines the operating of the second transistor;

a capacitor coupled to the gate terminal of the second transistor;

an organic light emitting diode (O-LED), coupled to the source/drain terminal of the second transistor, wherein the O-LED emits light when the second transistor operates, and the brightness of the O-LED corresponds to a signal level of the data signal;

the method comprising;

during the first sub-interval, applying a first pulse to the scan lines sequentially and applying corresponding data signals to the data lines; and

during the second sub-interval, applying a second pulse to the scan lines sequentially so as to turn on the first transistors and applying a prevention signal to the data lines so as to turn off the corresponding second transistors.

2. The method of claim 1, wherein the first transistor is a thin film transistor.

3. The method of claim 1, wherein the second transistor is a thin film transistor.

4. The method of claim 1, wherein the second transistor is an N-type transistor.

5. The method of claim 1, wherein the second transistor is a P-type transistor.

6. The method of claim 1, wherein the prevention signal has a fixed signal level.