The DX07 has a number of interesting properties related to its small size and high resolution. The following are true for someone with "normal" vision using this screen as a hand held device:

• Smallest pixel size to comfortably view a hand held device without loss of detail
• Smallest hand held screen without loss of detail for NTSC DVB content (720x480 pixels)
• Smallest hand held screen without loss of detail for NTSC DVD content (720x480 pixels)

Notes:

• "Normal" vision is when someone can distinguish detail at 1/60 of a degree (an arcminute)
• The closest a hand held screen can comfortably be viewed is 250mm (approx. 10 inches)

The smallest visible pixel size (p) for a hand held device can be calculated assuming the screen is held at a comfortable distance (250mm) for someone with "normal" vision (able to see detail at a 1/60 degree angle):

${\displaystyle p=250\cdot sin{\tfrac {1}{60}}\approx 0.0727mm=72.7\mu m}$ 

It can therefore be concluded that the pixel size for the Hitachi DX07 screen is only 5% greater than the smallest possible for practical use.

Note: Smaller pixel sizes would dither in much the same way as printed dots (72.7µm is approximately 350dpi)

If other hand held devices were manufactured for the latest high-definition video screen, then their smallest sizes without loss of detail (i.e. 72.7µm pixels) would be as follows:

• Hitachi DX07 press release (English)
• Hitachi DX07 press release (Japanese)
• BeHardware's Test: the influence of electronic components on LCD colors