Here are the last displays I've heard about in this range, but they are all LCD :
- LG - 5" - 1920x1080 (441 ppi) : http://www.engadget.com/2012/06/05/lg-d ... e-display/
- Toshiba - 6,1" - 2560x1600 (495 ppi) : http://www.engadget.com/2011/10/20/tosh ... esolution/
- Sharp - 6.1" - 2560x1600 (495 ppi) : http://www.engadget.com/2012/06/01/shar ... -sid-2012/
- Ortustech - 4.8" - 1920x1080 (459 pi) : http://www.ortustech.co.jp/english/news/20101026.html
As a comparison, the display used in the Oculus Rift is 5.6" 1280x800 (270 ppi).
SMD (the creator of the ST1080) say on their website that 8k4k LCoS panels are in development but they don't give any timeframe. They said they showed 4k2k 0.82" panels at CES 2012 but I don't know if this size can be used in a large FOV HMD.