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AMOLED: Display market's next 'big thing'

Posted: 31 May 2010 ?? ?Print Version ?Bookmark and Share

Keywords:OLED? AMOLED? display market? LCD?

A Samsung keynoter at the Society for Information Display (SID) hailed amorphous OLED (AMOLED) as the next "big thing" in displays, powering smart TVs and smart mobile devices.

AMOLEDs will be the technology that will enable smart TVs and smart phones because of the natural advantages they exhibit for both markets, according to Sang-Soo Kim, executive VP, Samsung Fellow and SID Fellow, Samsung Mobile Display.

"The AMOLED has two strengths: it is fundamentally simpler than and LCD, and exhibits better display performance," said Kim. "By 2015 AMOLEDs will be a mainstream technology for large-size TVs."

What's more, Kim said that flexible the AMOLED will drive the mobile market. Its superior strength, flexibility and endurance make it ideal for mobile devices. Kim's vision is to have 600 mobile AMOLED devices by 2015 and "even 1.5 billion are possible."

Kim said that OLED commercialization took only 10 years as opposed to LCD's 35 years from concept to volume production.

But for "the TV market to grow, 3D LED TV needs to be accepted by the consumer." Kim said that for large AMOLED TVs to appear Samsung needs to make them in a Gen 8 fab. Today panels are made in Gen 4.5 and soon in a new Gen 5.5 fab.

"It is very a 'very green' technology with response time in microseconds, it is self-emissive, and stereo images can be separated perfectly using SEAV driving," said Kim. The crosstalk free operation (between image information served to the right eye and left eye without interference) can be solved by frame-by-frame driving scheme as opposed to the usual by line-by-line.

In a separate paper, co-authored by Kim and delivered at SID, Samsung researchers detail their development of a driving scheme for AMOLED TVs that could lead to auto-stereoscopic viewing experiences. Watching 3D TV programs without glasses may not be here yet, but the new driving scheme provides for a better stereoscopic experience, according to the researchers.

The new scheme, called SEAV (Simultaneous Emission with Active Voltage control), differs from the conventional method in that all of the panel's organic light emitting diodes are turned on simultaneously, rather than progressively. This allows a longer time for the active shutter glasses to switch, and therefore, the left and the right images are completely separated, resulting in crosstalk-free solid depth perception. Many 3D displays fail to reproduce the feeling of solidity of a 3D object because some of the information of the image intended for the left eye gets to the right eye and that for the right eye reaches the left eye.

Researchers have been tackling this undesirable effect called left-right crosstalk with different schemes.

Samsung's driving method SEAV has the following advantages: longer life time from higher aperture ratio; improved yield from the simplified circuit; simpler peripheral circuits from the reduced number of scan lines, greater driving margin from the reduced capacitive load of the scan lines, and less performance demands on the TFT backplane.

- Nicolas Mokhoff
EE Times

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