Jump to content

Hitachi DX07

From Wikipedia, the free encyclopedia

TheHitachi DX07is a 2.9 inch (73 mm)liquid crystal displayscreen which went into mass production in December 2006:

Each pixel is therefore 78μm x 77μm (1μm= 1/1000mm).

Note: It's also safe to assume that this is an 8-bit per channel display (a 6-bit per channel display can onlydither1.62 million colours)

Optical Properties of the DX07

[edit]

The DX07 has a number of interesting properties related to its small size and high resolution. The following are true for someone with"normal" visionusing 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 forNTSCDVBcontent (720x480 pixels)
  • Smallest hand held screen without loss of detail for NTSCDVDcontent (720x480 pixels)

Notes:

Smallest Visible Pixel Size for a Hand Held Device

[edit]

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

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 wouldditherin much the same way as printed dots (72.7μm is approximately 350dpi)

Other Hand Held Screen Sizes

[edit]

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

Format Pixels Screen Size Diagonal
DV NTSC 480x720 35mm x 52mm 63mm (2.5 inches)
PAL 576x720 42mm x 52mm 67mm (2.6 inches)
720p 720x1280 52mm x 93mm 107mm (4.2 inches)
1080p 1080x1920 79mm x 140mm 160mm (6.3 inches)
[edit]