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Optoelectronics/Displays  

Sony's OLED TV not up to par

Posted: 13 May 2008     Print Version  Bookmark and Share

Keywords:OLED  organic electroluminescence  RGB architecture 

DisplaySearch, a display-market research firm, has released a report on the characterisation of the active-matrix OLED (AMOLED) technology in Sony's OLED TV and the said news is not encouraging.

It turns out that the Sony XEL-1 TV—a first of its kind using organic electroluminescence technology—might not live long enough for anyone to see, even after it's been hyped, analysed and taken apart.

According to the report, the RGB architecture is sensitive to the image, and it has a 5,000hr lifetime for white and a 17,000hr lifetime for the typical video image—well below the Sony Corp.'s published specifications.

Moreover, the panel suffers from differential ageing. After 1,000hrs, the blue luminance degraded by 12 per cent, the red by 7 per cent, and the green by 8 per cent, said the report.

Other key findings include:

The sub-pixel architecture includes two TFTs and two capacitors. The pixel architecture does not use a common support layer, as the materials and thickness are different. The micro cavity structure results in multiple reflection interference. The brightness is severely reduced in high-ambient conditions. The black levels are less than 0.01cd/m, lower than any other display (PDP or LCD) currently on the market. The top emission design includes a colour filter and a circular polariser. The cathode is semi transparent. The design includes a unique approach to cooling the OLED.

DisplaySearch analysts claim that the Sony display is significantly inferior in many ways to other current AMOLED designs.

- Nicolas Mokhoff
EE Times Europe





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