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03-26-2008, 06:30 PM   #1
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Measured resolution of K20D back screen

The question kept coming. What is the real resolution of the K20D back screen LCD?


Is it 230k dots, pixels, and what the hell are dots?

So I decided to measure it once and forever. This is my final verdict:
312 x 234 pixels, each being a true RGB pixel
or 219000 visible "dots".
Therefore, the 230k dots are not 230k pixels. Sorry, folks.
The screen is 4:3 but never used in more than 3:2, except in zoom mode where it uses full 4:3. Removing the upper and lower black bars in 3:2 we get:

312 x 208 RGB or 195000 "dots" (as shown in the image below).


Assuming that the 312 x 234 above are actually meant to be QVGA (3-4 pixels black borders) , we get:

320 x 240 RGB or 230400 "dots".

Each pixel is a group of 3 "dots" sitting together in an hexagon able of displaying the full RGB color spectrum.

The hexagons are aranged in a 0 degree by 45 degree lattice as found in an apple box.


The perceived sharpness comes from the fact that individual RGB dots are invisible and that the lattice isn't rectangular.


Here come my proofs:

First is an image of the back screen of a K20D in PLAY mode, taken with a *istDS and cropped & reduced to 33% size, the second is a crop showing the individual hexagons (or pixels).


Last edited by falconeye; 06-15-2011 at 05:27 AM.
03-26-2008, 06:34 PM   #2
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Impressive finding! Thanks for the info. I still find the preview a little jaggy, maybe Pentax should have used a 3" LCD.
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