The amount of apps in the Windows Phone Marketplace
Microsoft's Windows Phone Marketplace has now reported to have passed 25,000 apps by one site tracking comings and goings within it. (source: WindowsPhoneAppslist, July 2011)
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What doo you mean by "stole Sonys idea of the OLED"? The OLEd wasn't invented by Sony. It is over 50 years old now and goes back somewaht to A. Bernanose and co-workers at Université de Nancy in France when they first produced electroluminescence in organic materials in the early 1950's.
The hurdles are that the organic molecules to produce the color blue arent verry stable. They only had a lifetime of 14000 hours (running 8 hours a day), where current LCD's and Plsama-TV's had approx arround 60000. Different ideas and ways for solving sprung up like coating with fish-oil (substract made form the oil of salmon that stabelized the degradation of the molecules by some rate) and others.
Some of them produce now lifespans past that ones of LCD's (current experimental fifespans for color red >9000000 hours, green 198000 hours, blue 62000 hours). Also the lifespan here isn't the actual lifespan of operation till a diod dies off completely, it's more a calculated lifespan till to the point where the diod only produces 50% of her initial light output, quite noticeable. It also is depending on the operation temperature and the light output you draw (a well cooled OLEd with a short lifespan is still better off than the same run on higher temperatures and one run on 80% lightoutput lasts in average longer than one on 100%). So if your read somewhere, that the red OLED's last in average 10Mio hours, ~1100 year, it is only a statistic average. There might still die a few within the next 5 years. And statistically a few in short time for blue is noticeable in pixel failures.
The lifespan is important for high end consumer electronics such as TV's and computer displays, as you can imagine. It's far less importend fpor portable devices withe smaller displays such as cell phones, mp3-players and car radios for they usually get replaced befor the displays decays and also dead pixels arent't that relevant where as on a screen your work with or you watch movies it's quite enoying.
Add:
because of the decaying of the organic molecules, especially the less stable blue ones (they are all verry sensitive to oxigen because organic material is oxidized easily), it is one off the first logic necessities to seal the display off airtight.
Sealing off a small panel is quite easy but the bigger ones... You need a whole anoxic production-lines for compley large displays with complex active matrix backplanes in which the whole panel is produced. And the bigger the surface, the greater the margin for errors and the more severe the consequences on a failure = a whole 40" panel might be rubbish, time and money down the drain, where you can produce with ease 1000 small displays and only loose a few.
Add2:
As I mentioned, the hurdles lay mainly in the life expectancy of the blue coloured units. They had a seriously decreased lifespan compared to the other colours in the display. However this has been improved on recently.
Other problems included the organic LED’s distaste for water. Any water that is introduced to the display would destroy the unit. So you also need to make the diplays waterproove and no water must be introduced or even present in the slightest during the production process.
Due to the high output of the green element in OLED displays, OLED screens are often green biased unless appropriate limiting actions are taken.