PMOLED Passive Matrix Organic Light Emitting Diode

- details about the PMOLED, passive matrix organic light emitting diode, its technology, operation and use.

The PMOLED, passive matrix organic light emitting diode, is a form of organic light emitting diode, OLED that is starting to be used within a number of products including cellphones, automobile applications, and even some audio equipment.

The PMOLED is one of around six different types of organic LED display that have been developed and are starting to be used.

The PMOLED displays are suited to applications where text and icons are displayed.

PMOLED basics

The PMOLED structure is arranged in a format that has rows and columns. There are columns of organic cathodes superimposed on rows of anode material.

With this type of format, the row and column lines can be turned on to activate the individual pixels at the intersection points.

PMOLED Structure
PMOLED Structure

The organic material is set down between the anode and cathode - with both the organic material and cathode metal regions being deposited using relatively standard processes. This enables large scale manufacturing to be achieved in a relatively cheap manner.

In terms of their structure, the layers of organic material are set down in a form of ribbed structure with columns and rows obviously running in different directions.

Although the concept of the PMOLED structure is relatively straightforward to design and fabricate, they require relatively complicated drive arrangements because each line needs to have the current limited for each diode - this will change according to the number of diodes in a given row that are activated.

In addition to this, the PMOLEDs require a significantly higher power consumption level than their active AMOLED counterparts. As a result PMOLEDs are normally most suited to display applications where the display size is less than about 50 mm to 80 mm across the diagonal or where there are less than about 100 rows.

By Ian Poole

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