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Cornea Systems MP704 17inch TFT LCD Display

Cornea Systems MP704 17inch TFT LCD Display - PCSTATS
Abstract: Differences do exist which separate the high-end from the more value oriented products, but the visual results are less dramatically affected.
 75% Rating:   
Filed under: Monitors Published:  Author: 
External Mfg. Website: Cornea Jun 20 2002   Max Page  
Home > Reviews > Monitors > Cornea MP704

TFT Display Evaluation Notes

PCstats TFT Display Evaluation Criteria:

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.

  • 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

    LCD Display Test Overall Test Notes and Observations
    Geometry: Pass

    Geometry remains excellent as we tend to expect from an LCD display.

    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.

    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.

    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.

    Focus: Pass

    Excellent, all patterns are clearly visible and defined in both the horizontal and vertical axis.

    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.

    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.

    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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    Contents of Article: Cornea MP704
     Pg 1.  Cornea Systems MP704 17inch TFT LCD Display
     Pg 2.  Cornea MP704 from the front and back
     Pg 3.  — TFT Display Evaluation Notes
     Pg 4.  Final Conclusions

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