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Samsung Syncmaster 191T 19 inch TFT LCD Display
Samsung Syncmaster 191T 19 inch TFT LCD Display - PCSTATS
Abstract: We often take for granted the standard LCD display, looking first for the ultra thin dimensions primarily, and then investigating other areas.
 88% Rating:   
Filed under: Monitors Published:  Author: 
External Mfg. Website: Samsung Apr 29 2002   Max Page  
Home > Reviews > Monitors > Samsung 191T

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

    Excellent picture geometry at the 191T's native 1280x1024 resolution. The image is very sharp, but curved lines are not exceptionally blocky as you might first expect.

    Brightness and Contrast: Pass

    Good clean shading but difficult to see the first few percentiles (from 1%-3%). There is no ghosting or unevenness in black background. Screen contrast is very high, and the blacks are very black, not greenish as with some lower-end displays.

    HV Test: Pass

    This test is more applicable to CRT displays than it is to an LCD. How ever since it forces the display to show a full screen of black or white, while maintaining a solid white line around the outside it is a good indicator of refresh rates on both the display and pixel levels.

    Colour: Pass

    The brightness of this display is very good, even though it is only listed at 250cd/m2. When showing white screens the 191T appears brighter than our comparison CRT. The red, blue and green test screens were all very bright and very consistent over the full area. There was no visible dark patches, banding, or broken pixels.

    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 the native 1280x1024 resolution. Image dithering at lower resolutions is also very good as with other Samsung LCD's we have reviewed recently.

    Moire: Pass

    Excellent, all test patterns were displayed properly and without interference or 'walking lines'. Properly adjusting the image sharpness is critical in this area, as the auto adjust does not always update this setting.

    Other Evaluation Notes:


    Like the 181B, the pixel refresh rate for the 191T is 25ms. With a set of viewing angles at 85/85/85/85 it is currently at the highest standard available. The stand was very stable, although rotating left to right was not smooth or easy - there was too much friction. The vertical height adjustments with this stand are nice, and the tilting is easy to adjust.

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    Contents of Article: Samsung 191T
     Pg 1.  Samsung Syncmaster 191T 19 inch TFT LCD Display
     Pg 2.  The 191T from the front and back
     Pg 3.  — TFT Display Evaluation Notes
     Pg 4.  Final LCD Conclusions

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