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Differences do exist which separate the high-end from the more value oriented products, but the visual results are less dramatically affected.
75% Rating: 
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Cornea MP704 |
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TFT Display Evaluation Notes
| PCstats TFT Display Evaluation
Criteria: |
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We
evaluate the quality of TFT displays with the help of a program called
Nokia Monitor Test. The software application displays a range of colours
and test patterns that can help diagnose just about any visual problems or
defects a TFT display may contain.
It can also be a very useful tool for
properly adjusting a display to the optimal settings. The software
consists of eleven tests which can be run in steps as adjustments are made
to the OSD. As the tests are run we look for the following problems, only
one of which should be inoperable (broken pixel).
Broken Pixels: What we class as a 'broken pixel' can
fall under any one of the following circumstances: Pixel always on (any
colour), pixel always off, pixel unable to display a shade (red, green,
blue, black, white), pixel shown colour gradient.
Pixel Clock: If the number of dot clocks within one
horizontal synch are not properly configured the screen will appear to
drift or vertical stripes may be generated. This should be correctable by
the on screen menu.
Phase: If the phase of the display data and dot clock
are not correctly tuned the screen can flicker, or text be displayed
blurry. For example text may appear dithered, or when looking at a test
pattern of a one-pixel black, one-pixel white checkerboard pattern the
pattern may be distorted. This should be correctable by the on screen
menu.
Response Time: We look for any streaking associated
with moving a full page of text up or down quickly. Displays with slower
refresh rates tend to show some degree of image streaking or text
discoloration which can be distracting.
Stand Stability: TFT displays are fragile components and the
stand should offer adequately stable support as well as be easily
adjustable.
We deduct marks for quality control if there are any predominant
broken pixels in a display. While many manufacturers may consider a
few broken pixels acceptable, we believe the high cost of TFT displays
should translate into a clear and unblemished image. |
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| Display Test System
Configuration: |
| Video Card: |
ATI Radeon 8500 |
| Operating System: |
MS
Windows 2000 |
| Display Settings: |
Color Temp: 6500 Kelvin
Resolution: 1280x1024
pixels
Frequency: 60Hz
Colour: 32
Bit | |
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| LCD Display Test |
Overall |
Test Notes and Observations |
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| Geometry: |
Pass |
Geometry remains excellent as we tend to expect from an LCD display.
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| Brightness and Contrast: |
Pass |
Good shading for
the most part. Controls had to be adjusted a few times
to get brightness and contrast levels within order. Pure blacks are good, but
screen has slight greenish hue when powered off.
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| Colour: |
Pass |
The brightness of the MP704 at 250cd/m2 is very good, and comparable to higher end units. Solid
colour test screens were acceptable, but at least one dull pixel was visible.
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| Convergence: |
Pass |
The test grids in RGB illustrate the
worst case situations when different coloured pixels must work closely
together, and since they comprise different parts of a pixel they do not line
up exactly.
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| Focus: |
Pass |
Excellent, all patterns are clearly visible and defined in both the
horizontal and vertical axis.
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| Resolution: |
Pass |
Resolution was also excellent at 1280x1024 pixels.
The auto adjust key didn't seem to include adjustments to brightness or contrast
with was interesting to see.
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| Moire: |
Pass |
Moire was excellent at 60Hz, with
no visible walking lines or other distortion on the
vertical 1 pixel test patterns. At higher frequencies the monitor was more sensitive
to how it was configured.
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Other Evaluation Notes: |
Excellent |
With
a 25ms pixel refresh rate and viewing angles of 40/65/65/65 the MP704 is
not especially astounding. The current line of top-level LCD displays use viewing angles
of at least 80 or 85 degrees. A removable base and VESA mounting points would have
improved the usefulness of this display, but they were
absent.
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