FlatpanelsHD will review both monitor. I start with the LP2275W in this review. The LP2275W has a S-PVA panel. The LP2475W has a S-IPS panel.
|Response time:||8 ms (g2g)|
|Colour gamut:||72 % af NTSC|
|Signal processing:||8 bit for each colour|
|Viewing angles (H/V):||178°/178° (contrast 10:1)|
|Dot pitch:||0.282 mm|
|Panel (Type):||S-PVA (Samsung)|
|Power consumption:||56 W|
|Dimensions (HxWxD):||32.8cm x 50.6cm x 25.3cm (with stand)|
|Other||2-port USB Hub|
Price and retailer:
|US retailer||UK retailer|
The stand offers a number of very convenient ergonomic features. First and foremost, it lets you rotate the frame from side to side. On my desk this is a plus, since I often use a multiple monitor setup.
In addition the LP2275W offers height adjustment, tilt adjustment and pivot. The screen can be increased a lot in height and lowered to about 7-8 centimeters above the table.
The framework on LP2275W is solid as well and slightly better than on the LP2475W. The LP2475W bounces when hitting the keys on the keyboard.
All inputs are located on back of the monitor. LP2275W does not have as extensive inputs as its big brother, but it is well suited for a though market with its D-SUB (VGA), DVI and Display Port.
The monitor has been measured and calibrated with a LaCie Blue Eye Pro. We also examine the monitor with the help of our monitorTest. And finally we test the monitor in games, movies etc.
The graph says:
The number on the left is the delta value. Delta is a difference between two factors, here it’s the difference between the measured colour on the panel and the actual colour that we want; the target colour.
LP2275W have some minor and some moderate deviations in the color reproduction. In practice, however, most colours looks to be reproduced nicely and the picture balance is fine mainly due to a precise gamma (the progression of light in grey tones from white to black).
The color temperature is slightly below our target of 6500 Kelvin and is measured at 5737 Kelvin. It is unusual to see that manufacturer set the color temperature below 6500K. Most of the time the colour temperature is far over 6500 Kelvin, which gives a very bluish picture. A colour temperature of 5737 K results in a slightly warmer image with a red push.
Blacks and deep grey tones are reproduced fairly and the shading - in dark grey tones - is fair even before calibration.
I took our advanced test equipment and performed a calibration; primarily to improve color accuracy. The brightness is about right at 133 cd/m2 (I lowered it before the “out-of-box” measurement). I also made some changes to the RGB (red, green, blue) settings. To see the new results after calibration look at the graph below.
These are the settings after calibration:
I have reduced the brightness to get a screen that is more convenient to work at for example in an ordinary office space environment (it was done before the first measurement). I then calibrated the RGB settings - in other words, colour calibration of red, green and blue which are used to create all other colours on the panel.
Color calibration is easy on HP LP2275W because the monitor provides the user with fair opportunities to precisely calibrate with very small"steps”.
A preliminary problem is, however, that red, green and blue are all set at 255 which is the maximum value. We must therefore take a new starting point and reduce all three primary colours in order to get a starting level where the basic colors can be either raised _or_ lowered. I used 240 for this. The menu lets you, as mentioned above, operate with very small steps in the colors settings, and this is a big plus when you want to do a comprehensive calibration with accurate colour results.
I started with the green setting and lowered it somewhat. I always start with the green colour because this one also controls red and blue; at least that’s very common on LCD screens. When green is reduced, the red and blue will typically balance themselves. Of course the green colour needs to be “off”: There’s no point in changing a correctly set green colour to balance blue and red.
In addition I also lowered blue to remove the light over-saturation of blue in the picture on LP2275W.
After calibration - before calibration as well - the panel reproduces a lot of detail, because of the good colour reproduction. Different colours are distinguished from each other very well.
I usually tests to see if colours are reproduced correctly on gradients, for example a black to red gradient or a black to blue gradient. The gradient needs to be smooth and you should be able to distinguish all the colours from each other. Please download monitorTest software to find our highly praised test tools.
LP2275W excels with almost perfect and very beautiful color reproduction, which makes the screen very well suited for graphic work.
We have measured contrast; the ratio between brightness and the black levels: NB: This is the static contrast and no dynamic contrast has been measured.
|Sortniveau||0,14 cd/m2||0,15 cd/m2|
|Brightness||133 cd/m2||160 cd/m2|
The LP2275W is able to reproduce fairly deep blacks but not as deep as the Eizo S2231W that uses the same panel. The black reproduction is good though and amongst the lowest we have measured on a LCD monitor. It’s also better than on the LP2475W that we will be reviewing soon.
The shadow details (grey colour tones) are reproduced beautifully and dark images are full of details. Even the darkest shades of grey are distinguished from black - just as it is intended. Most PC monitors and LCD-TVs today still struggle to reproduce shadow details .
Black reproduction is not perfect if the light homogeneity (backlight bleeding) is not perfect as well. We have therefore examined the homogeneity of the panel. You can see from the picture below (click to enlarge) that the homogeneity is fine.
The light is distributed correctly and no light is getting through.
Personally I have no problem with using the LP2275W for sporadic gaming but I certainly would not use the monitor for FPS games and racing games. The response time is too slow and even though I don’t see heavy trailing or Overdrive trailing (the halo effect) the image get’s blurry in high paced action sequences with fast moving pictures. For gaming I recommend users to use the faster TN panels. TN panels do not have as nice colour characteristics, though, so that's a trade-off situation.
But even though the viewing angles are not perfect on the LP2275W I think they’ll satisfy most users’ needs. The colour tones change a little and contrast is reduced from the +30-35 degrees but it’s not critical.
I have taken a picture of the viewing angles below
But this also says something about the picture quality on the LP2275W. Eizo is generally considered one of the best monitor companies today because of their dedicated effort to reproduce correct pictures and HP is not far behind. The monitor needs a calibration in order to achieve optimal image quality but even before calibration colours are accurate and with a thorough colour calibration the user can obtain great results with the LP2275W.
Ergonomics are great, too. You can height, swivel, tilt adjust and put the monitor in pivot. Inputs include an analogous D-SUB (VGA) and a digital DVI and Display Port.
Compared to its big brother, LP2475W - that we’ll be reviewing soon - LP2275W reproduces a deeper black level and therefore contrast, but the viewing angles are not quite as wide – but not bad.
To round off this review let me compile some of my findings. I think the LP2275W is an incredibly well performing monitor, which delivers stunning picture quality. In spite of some minor things I have no doubt that deserves a Top-Recommendation Award from FlatpanelsHD.
It is not 100 % on par with the Eizo S2231W but LP2275W has a lower price tag and is an obvious choice for graphic designers, photographers or other demanding users. It’s not ideal for gaming or multimedia, though.
|Nice picture quality||Response time||Graphic designers and photgraphers|
|Blacks and contrast||Narrower viewing angles than LP2475W||Movie editing|
|Ergonomics and functionality||Minor deviations in out-of-box settings||Office / All-round|
Price and retailer:
|US retailer||UK retailer|
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