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Active matrix displays

An active matrix and display technology, applied in the field of active matrix displays, can solve the problems of small leakage of pixel "programming" current, excessive data line capacitance, etc.

Inactive Publication Date: 2011-05-18
CAMBRIDGE DISPLAY TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0010] A problem common to current-driven active-matrix pixel circuits is that, as is often the case especially in large displays, there is small leakage of the pixel "programming" current and / or data line capacitance exceeds

Method used

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Examples

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Embodiment Construction

[0030] refer to image 3 , a schematic diagram of a row or column display layout according to an embodiment of the present invention includes an active matrix OLED display 200 . The display 200 includes a programmable boost circuit, shown as a driver chip circuit 201 , a data line 202 , a pixel circuit 203 and a programmable drive boost circuit 204 .

[0031] Due to the active matrix arrangement of the pixel circuits 203, the programming of the display 200 has two phases. In the first stage, the driving circuit 201 identifies a desired current or current range to be supplied to the pixel circuit 203 from digital signal information, and supplies the current to a plurality of pixel circuits 203 storing the current in a storage unit (not shown) . Additionally, programmable boost circuit 204 operates during the first phase of this programming. In the second stage, the driving circuit 201 stops supplying current and the pixel circuit 203 drives an OLED (not shown) in the pixel c...

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Abstract

An active matrix OLED display (200) comprises a data line (202), a plurality of pixel circuits (203) connected to the data line (202), a drive circuit (201) connected towards one end of the data line (202) for writing display data to the pixel circuits (203), and a programmable drive boost circuit (204) connected towards another end of the data line (202) from the drive circuit (201).

Description

technical field [0001] The present invention relates generally to active matrix displays and to associated display driving methods. More particularly, the present invention relates to additional drive circuits for active matrix driven organic light emitting diode (OLED) displays for improving the operating characteristics of the device. Background technique [0002] Displays made using OLEDs can have many advantages over LCD and other flat panel technologies. They are bright, rich in color, fast switching (compared to LCDs), offer wide viewing angles and are easy and cheap to construct on a variety of substrates. Organic (here including organometallic) LEDs can be fabricated using materials including polymers, small molecules and dendrimers, with a range of colors depending on the materials used. Examples of polymer-based organic LEDs are described in WO90 / 13148, WO95 / 06400 and WO99 / 48160; examples of dendrimer-based materials are described in WO99 / 21935 and WO02 / 067343; a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32
CPCG09G2310/0262G09G2300/0408G09G3/3233G09G3/3283G09G2320/0223G09G2310/0248G09G3/3208H10K59/00H10K59/12H10K50/11
Inventor E·史密斯B·汤普森
Owner CAMBRIDGE DISPLAY TECH LTD
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