|Display Test System
||ATI Radeon 64 DDR |
||Windows 98 SE |
Colour: 32 Bit
Excellent geometry, the CM828 showed no visible distortion of any of
the test grids.
Contrast: Brightness was excellent under 32bit colour. Under 16-bit
colour the range of black shades was not represented as well as the previous
setting was able to. Contrast was excellent, the whites were displayed brightly
and the blacks were vividly absent of luminosity.
The horizontal trace lines remained stable during the three-bar test
while the vertical trace lines flexed ever so slightly. Overall the dampening
control is quite good.
Colours: For some reason, the colour red always
seems to me to be a bit under represented by Hitachi displays, while green and
blue are always very vibrant. Perhaps it is the dark tint on
the display that seems to mute red ever so slightly. Anyhow, it is by
no means a handicap. Also, the glass of the display causes the outer edges of
the display to be a bit darker than the center, so brightness distribution is not completely
Convergence: The convergence test displays a
range of coloured grids (white, purple, yellow, aqua and RGB) to test the
convergence of the three component colours which form the basis for all displays
- red, green and blue. We noticed a slight loss of convergence at the bottom
edge of the screen, but to a very minor degree. Overall the display showed
excellent characteristics in this regard.
Focus: Very good focus, especially in the
horizontal axis. The closely spaced parallel vertical lines showed slight
blending, which is more pronounced at the outside corners where they almost seem
to blend into one line at the 1600x1200 resolution. Still, the CM828 exhibited
much focus than the CM810 did.
Very good - horizontal lines were all sharp and distortion free.
Vertical lines were also very good, though once again the closely spaced single
pixel separated lines appear to blend in together some what, especially at the
Moire: Solid grey -excellent. Light
Grey - excellent. Vertical 1 pixel lines - very good, only slight herring bone
pattern on the outside 1/4 edge of screen. Horizontal 1 pixel lines - excellent.
Two pixel square pattern - excellent. One pixel square pattern -
Readability is just about as good at the center as it is at the outside
edges, ranking overall as very good.
None visible at
The Hitachi CM828 supports a very broad range
of resolutions. The full list of manufacture supported resolutions and frequencies are
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