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HP LP2275W review - FlatpanelsHD

HP LP2275W review


By Rasmus Larsen (@flatpanels)
17 Feb 2009




Introduction


HP is a major global player and although monitors is not one of their main businesses they have released some interesting models. Especially their new 75 series is of interest because of the two monitors called LP2275W and LP2475W at 22 and 24 inches, respectively.

The 75 series is targeted at photographers, graphic work or simply the more demanding users who wants something extra in terms of image quality.



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.



Size: 22"
Resolution: 1680x1050
Response time: 8 ms (g2g)
Overdrive:
Contrast ratio: 1000:1
Brightness: 300 cd/m²
Colours: 16.7 millions
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
Wall mounting:
Dimensions (HxWxD): 32.8cm x 50.6cm x 25.3cm (with stand)
Weight: 8,5 kg
Ergonimcs

Tilt
Swivel
Height
Pivot
Built-in speakers:
Inputs
VGA
DVI
DisplayPort
Audio (type)
SCART
S-video
Composite
Conponent
HDMI
Other 2-port USB Hub
Guarantee: -
Pixel guarantee: -
Etc:


Price and retailer:

US retailerUK retailer


Out first impressions


HP has used a black plastic frame which is supported by a rectangular grey stand. The stand is strong and steady.



Highslide JS


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.



Highslide JS


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.



Highslide JS


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.



Highslide JS


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.



Test tools


We use the DVI input for testing. The graphic card is Geforce 7900GTO.



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.



Picture Quality


I have taken an “out-of-box” measurement with our LaCie blue eye pro calibrator below.



Highslide JS



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.



  • A delta value lower than 2 results in a visible deviation from the actual colour.
  • A delta value over 4 or 5 results in wrong colours.
  • A delta value between 1 and 2 results in precise but not perfect colours.
  • A delta value lower than one results in almost perfect colours. The target is 0.
  • Everything between 0 and 1 is barely visible to the human eye.



    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.



    Highslide JS



    These are the settings after calibration:




    After calibration
    Brightness: 50
    Contrast: 50
    RGB: Manual
    • R: 241
    • G: 211
    • B: 232



    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.



    Out-of-Box After calibration
    Sortniveau 0,14 cd/m2 0,15 cd/m2
    Brightness 133 cd/m2 160 cd/m2
    Contrast ratio950:11067:1
    Contrast ratio +/- 50



    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.



    Highslide JS


    The light is distributed correctly and no light is getting through.



    Response time and games


    Neither the LP2275W or the LP2475W is intended for gaming. It’s not a problem to play for example traditional real time strategy games on LP2275W but the performance and response time is not as good as on a genuine gamer screen.



    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.



    Movies and viewing angles


    The viewing angles on the LP2275W are not as wide as on the bigger LP2475W but this was expected because of the two different panels; S-PVA in LP2275W and S-IPS in LP2475W. Viewing angles are not bad on S-PVA panels and they are superior to TN panel viewing angles but the S-IPS panel technology is still the best LCD panel technology when examining viewing angles.



    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


    Highslide JS


    Highslide JS



    Conclusion


    HP LP2275W impresses us in almost every aspect and it challenges the much acclaimed Eizo S2231W, which also has a 22 inch S-PVA panel – but is selling at a higher price. HP LP2275W does not have quite as extensive setting options and not as deep blacks but besides that the two monitors have a lot of similar picture characteristics and many common features.



    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.




    Press the award logo to learn more.



    Pros Cons Target group
    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 retailerUK retailer


    ---


    For questions and comments please visits this thread in our forums: http://www.flatpanelshd.com/flatforums/viewtopic.php?f=5&t=21




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