April 30, 2012

The Kindle Fire is not part of the Android Market Tablet. Remove the Kindle Fire from the Android tablet market shares from ComScore and you can see it has no impact : all the market stays the same for the various models. There isn’t even an impact on tablets with the same size that are in direct competition.

Like the iPad, the Kindle Fire is not a tablet-competing-with-other-tablets on features and price. It is the entry point to a platform and an ecosystem. People don’t compare tablets and choose the iPad or the Kindle Fire. They intend to buy specifically this model and don’t compare it to others.

March 28, 2012
Pay The Rant: Panasonic 2012 Plasma - 2500Hz FFD Explanation Attempt

I should have posted this here.


Panasonic now have a new “marketing number” : 2000Hz and 2500Hz Focused Field Drive. I’m trying to understand what that mean and here is the result of my investigation.

Let’s get back to Plasma 101.

To display a frame, Plasma do temporal dithering, also call sub-fields. We’ll simplify to a gray…

March 16, 2012
iPad WiFi-only battery life

Since the annonce of the iPad (3rd gen), everyone have been talking about LTE as the reason for the need of a fatter/heavier iPad to accommodate a bigger battery (indeed, the new battery packs a whooping 70% more power).

But when looking at Apple advertised battery life, turning on LTE only reduces the battery life by 1h.

The iPad 2 can hold 10h with WiFi only on its 25Whr battery. That’s 2.5W of power required for the logic board, WiFi and the display.

The iPad (3rd gen) can also hold 10h with WiFi only on its 43Whr battery. That’s 4.3W of power required for the logic board, WiFi and the display.

The difference between those 2 iPads running WiFi only are:

  • a new quad-core GPU instead of a a dual-core GPU
  • the Retina display: twice the LED backlight, 4 times the pixels
  • 1 GB or RAM instead of 512MB

So, the Retina display and the GPU+RAM to drive it are drawing an additional 1.8W, that’s a 72% increase in power consumption.

If you check my previous post, LTE is drawing only 0.21W more than 3G. So it means that the new Retina display is drawing 9 times more power than the LTE chip. And so THIS is the reason the iPad battery is so HUGE. Adding LTE only would have required only 1.8Whr, hence battery upgraded from 25Whr to 26.8Whr.

7:12am  |   URL: http://tmblr.co/ZLFDjvI3xGSE
Filed under: apple ipad 
March 16, 2012
3G vs LTE in iPad and iPhone battery life

For both iPad 2 and iPad (3rd gen), using cellular data (respectively 3G and LTE) reduces the battery life from 10h to 9h. So cellular connection uses 10% of battery capacity for 9h. Battery is 25Whr on the iPad 2 and 43Whr on the iPad (3rd gen).

Now, on iPhone 4S, 3G reduces battery life from 9h to 6h for internet use. 3G uses 33% of battery capacity for 6h. Battery is 5.3Whr on the iPhone 4S

So 1h of cellular connection uses:

  • 0.27Whr for 3G on iPad 2
  • 0.29Whr for 3G on iPhone 4S
  • 0.48Whr for LTE on iPad (3rd gen)

Number are rather consistent for 3G between iPad 2 and iPhone.

So, if Apple keeps the same battery from the iPhone 4/4S and adds the same LTE chip from the iPad (3rd gen), battery life for internet over LTE will be 5h, down from 6h with 3G. Apple would need to add 1Whr to keep the same 6h over LTE, which is a 18% increase (and would increase battery over WiFi to over 10h).

Between the 3GS and the 4, Apple managed to increase the battery by 17%. But they did so by putting the antenna on the outside. They cannot remove a lot from the inside anymore.

4:27am  |   URL: http://tmblr.co/ZLFDjvI3nokM
Filed under: apple iphone ipad lte 3g 4g 
March 16, 2012
LTE uses 25% of iPad (3rd gen) added battery capacity

So, let me explain.


  • LTE lowers iPad (3rd gen) from 10h to 9h
  • iPad battery was upgrade to 42.5Wh from 25Wh

New battery is 170% of previous battery. Added capacity is 70% of previous battery. LTE uses 10% of new battery so 17% of old battery.

So LTE is using 17/70=24.28% of added capacity.

3:51am  |   URL: http://tmblr.co/ZLFDjvI3lVnM
Filed under: apple ipad