Current driver for active matrix organic light emitting diode

• US 20030090445A1
• Filed: 06/18/2002
• Published: 05/15/2003
• Est. Priority Date: 11/14/2001
• Status: Abandoned Application

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Chen, Chien-Chih, Chen, Shang-Li
• Application Number:
  US10/173,153
• Publication Number:
  US 20030090445A1
• Time in Patent Office: Days
• US Class Current: 345/76
• CPC Class Codes: G09G 2300/0417 Special arrangements specific to the use of low carrier mobility technology
• CPC Class Codes: G09G 2310/02 Addressing, scanning or driving the display screen or processing steps related thereto
• CPC Class Codes: G09G 2310/0251 Precharge or discharge of pixel before applying new pixel voltage
• CPC Class Codes: G09G 2310/0297 Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 3/3225 using an active matrix
• CPC Class Codes: G09G 3/3283 in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements

Abstract

The present invention provides an integrated current driver structure for an active matrix organic light emitting diode, in which a current driver alternately inputs current from a main current source to a plurality of data lines, thereby reducing the current consumption and the number of ICs.

Claims

1. An integrated current driver structure for an active matrix OLED, comprising:

a panel;

a pixel matrix consisting of a plurality of pixels arranged in matrix on the panel;

a current driver having a plurality of driver units arranged in a row on the panel, wherein an output of the driver unit is connected to a column of pixels by a data line;

a plurality of current controllers in charge of refreshing sequence of current data of the current driver;

a plurality of current input lines, each of which is connected to an input of one driver unit; and

a scan driver connected to the pixels in charge of refreshing sequence of current data of the pixels in a row. The scan driver may be integrated on the panel or impleamented outside the panel with driver ICs.

2. The structure of claim 1, wherein the active pixel matrix includes a plurality of pixels arranged in matrix on the panel, each of the pixels having an OLED or polymer-based light emitting diode or any other luminescence devices in which the brightness is controlled by current and the refresh of display data is controlled by a scan line.

3. The structure of claim 1, wherein the driver unit of the current driver samples the current from the input and regenerates a current in a predetermined ratio at it'"'"'s output.

4. An integrated current driver structure of an active matrix OLED, comprising:

a panel;

a pixel matrix consisting of a plurality of pixels arranged in matrix on the panel;

a first current driver having a plurality of first driver units arranged in a first row on the panel;

a second current driver having a plurality of second driver units arranged in a second row on the panel;

a plurality of current controllers in charge of refreshing sequence of current data of the first and second current drivers;

a plurality of current input lines, each of which is connected to an input of one first driver unit, while an output of each first driver unit in the first row is connected to an input of each second driver unit in the second row, and an output of each second driver unit is connected to a column of pixels by a data line;

a scan driver connected to the pixels in charge of refreshing sequence of current data of the pixels in a row. The scan driver can be integrated on the panel or impleamented outside the panel with driver ICs.

5. The structure of claim 4, wherein the active pixel matrix include a plurality of pixels arranged in matrix on the panel, each of the pixels having an OLED or polymer-based light emitting diode or any other luminescence device in which the brightness is controlled by current and the refresh of display data is controlled by a scan line.

6. The structure of claim 4, wherein the driver unit of the first and second current drivers samples the current from the input and regenerates a current in a predetermined ratio at it'"'"'s output, respectively.