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Hitachi CML151XW 15" TFT Flatscreen Display Review

Hitachi CML151XW 15
Abstract: The CML151XW is a 15" TFT display with the distinction of having one of the highest contrast ratios of any 15" flat screen we've looked at so far.
 75% Rating:   
Filed under: Monitors Published:  Author: 
External Mfg. Website: Hitachi May 15 2001   Max Page  
Home > Reviews > Monitors > Hitachi CML151XW

The Full Specs:

Specifications CML151XW
Size & Type 15" active matrix TFT
Pixel Pitch .297mm
Contrast ratio 350:1 (typical)
Brightness 200 nit (typical)
Display colours 16.7 million
Prime and Max. resolution 1024 x 768 @ 75 Hz.
Display size 304.1mm x 228.1mm
Viewing angle 45/55/60/60 (up/down/left/right)
Frequency range 31.5 - 60 kHz
56 - 75 Hz
Input Terminal Analog RGB Interface 15-pin D-sub
Input Signal Video 0.7 Vp-p 75 ohm. Synchronized TTL level separate composite sync.
Video clock frequency 79 MHz
Standard settings 14
User programmable 14
Power Consumption Approx 35W, 5W in standby
Weight 5.2kg
Dimensions 374x377x220 mm

Flatpanel displays differ from their CRT relatives on many fundamental levels. When comparing the two, there are a few pointers that are important to consider. Where CRT displays are typically judged by their dot pitch, LCD panels have several alternate points which relate to the quality of a display. The points to watch out for are contrast ratio, luminance (brightness), and viewing angle.

Looking at contrast ratio first, the larger the ratio, the better the display panel. The measurement is generally taken on the differences between black and white levels. For example, a ratio of 1:1 contrast would conceptually equate to a solid gray screen. From our experiences anything at, or above a 200:1 contrast ratio is quite good. The CML151XW has a contrast ratio of 350:1 which puts it at the top of its class.

Brightness is measured in cd/m2 or nits and is important when comparing TFT display's. If the display is not very bright, the white background colours can often seem pinkish, or dull when compared side to side with a CRT or other LCD panel. The panel used in the CML151XW has a brightness of 200 cd/m2 which is pretty much the norm from what we have been seeing lately. To give that value some scale, the highest brightness rating typically sits around 250cd/m2, and the lowest around 150cd/m2. Overall there is a lot less variance in brightness then there is with contrast.

Lastly, there are the viewing angles. Viewing angles are measured perpendicular to the face of the display. The larger the viewing angles in the up, down, left, and right direction, the better the display. For example the Hitachi CML151XW has a viewing angle of 45 degrees up, and 55 degrees down. That means we can view the display from an angle of around 45 degrees (say if we're standing up and looking down at the display) before the quality of the picture will be effected. Generally the effect can be described as the display 'grey's over' - colours are muted, and the entire display takes on a grayish/opaque appearance. The best viewing angles are typically 80/80/80/80 (up/down/left/right).

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Contents of Article: Hitachi CML151XW
 Pg 1.  Hitachi CML151XW 15" TFT Flatscreen Display Review
 Pg 2.  — The Full Specs:
 Pg 3.  External Aspects to consider
 Pg 4.  On Screen Controls
 Pg 5.  TFT Display Evaluation Criteria:
 Pg 6.  Conclusions

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