Issue 36 – March 2012
At this year's Consumer Electronics Show (CES) in Las Vegas, a display technology that drew particular attention was organic light emitting diode (OLED). It currently represents only a tiny proportion of flat panels, used mainly in smartphones and tablet computers, but this is set to change dramatically, as it is now ready to compete in the computer and TV markets. A new International Electrotechnical Commission (IEC) Standard specifies measuring methods of visual quality and ambient performance for OLED display modules and panels.
Bright and wide
OLED displays can provide high-contrast ratio, fast-response time, wide-colour gamut, and a wide viewing angle while operating with low-power consumption. In addition, OLED technology enables the production of thin devices that can be both flexible and transparent. This makes OLED displays ideal for mobile devices. Large-scale production of active matrix OLED (AMOLED) displays helped drive high-volume sales of certain models of smartphones.
OLED technology, initially limited to small screens, made great progress in 2011 and is now expected to be introduced in computer monitors and TV sets. The first large (55 inch) market-ready TVs were unveiled at the 2012 CES.
OLED display revenues are estimated to be around USD $4 billion in 2011 (about 4% of flat panel display revenues) and are forecast to exceed USD $20 billion (approximately 16% of the total display sector) by 2018.
Expansion made possible by Standards
This expansion of the OLED industry is made possible in no small part by the work of technical committee (TC) 110, 'Electronic display devices'. TC 110 recently published a new Standard, IEC 62341-6-2, OLED displays – Measuring methods of visual quality and ambient performance. This Standard, the fifth in the 62341 series, applies mainly to colour display modules.
The document 'specifies the standard measurement conditions and methods for determining the visual quality and ambient performance of OLED display modules and panels'. It describes the environmental and lighting conditions (dark-room and ambient-illumination). It also lists the requirements for human visual inspection of static images for different types of visible defects, stressing that 'human visual inspection and comparison against limit samples remains the most universal system for grading and classification of visual defects'.
To illustrate the various issues, this Standard gives sample images of visible defects and various diagrams and figures, such as an example of visual inspection room setup for control of ambient room lighting and reflections.
This Standard, like others in the same series, will help manufacturers of OLED modules and displays produce high-quality products and will represent a guarantee for consumers of devices with OLED displays.
Summarised from the International Electrotechnical Commission's e-tech, January/February 2012.
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