HP LP2475W
Simon Baker, 9 September 2008

 

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It's not often that you see this in the 24" sector, but HP have broken from the current trend of producing cheaper TN Film based displays, and have introduced a rare IPS based model into the market. At the time of writing, there are really only two IPS based screens in the 24" sector, one being available predominantly in the US, the NEC LCD2490WUXi, and one being available predominantly in the UK, the Hazro HZ24W (now updated to the HZ24Wi). IPS based screens are proving popular amongst enthusiasts out there, and have long been the choice of photography professionals and those looking for a screen for colour critical work.

HP have kindly sent us their new LP2475W screen, using the latest H-IPS panel from LG.Display, the LM240WU4. On a quick note, HP list this screen as being S-IPS based on their website, but close inspection of the pixel structure reveals the pixel orientation to be vertical, and characteristic of the latest H-IPS generation. Ultimately they are IPS matrices, just with different naming schemes depending on structure and generation. Being one of the few IPS 24" screens in the market, the LP2475W is obviously picking up a fair amount of attention. Let's take a look at the listed specs first:

Size

24"WS

Colour Depth

16.7M (8-bit), 92% NTSC colour gamut

Resolution

1920 x 1200

Viewing Angles

178 / 178

Response Time

6ms G2G (12ms ISO)

Panel Technology

H-IPS

Contrast Ratio

1000:1

Interfaces

DVI-I (x2), HDMI, DisplayPort, Component, S-Video and Composite Video. 6 port USB hub

Brightness

400 cd/m2

Colour

Black bezel with silver stand

Special Features

Tilt, height, pivot and rotate ergonomic adjustment. Full range of aspect ratio control options, 92% colour gamut, PiP and PoP support, integrated USB hub

 


Above: Front and back views of the LP2475W. Click for larger versions

The HP LP2475W comes in an attractive black design, with a nice thin bezel and matte finish to the screen surrounds. The panel is also of the traditional matte Anti-Reflective (AR) finish, as opposed to any glossy screen coating. The stand is finished in a silver colour, and offers a large rectangular footprint on the desk. Some people may find the stand a little bulky and unattractive, and in my opinion it was perhaps a little too large. It did however offer a very sturdy base for the screen and all in all, the LP2475W looked professional sat on the desk.

The screen features a small unobtrusive HP logo at the top in the centre, and the OSD operational buttons are situated in the lower right hand corner. These are tucked nicely out of the way and are flush against the bezel. The power LED glows a bright green colour when the screen is turned on, and glows amber when in standby. I felt the power LED was a little overly bright in fact, and was a bit distracting in practice. The OSD does feature an option to disable this however should you find the same thing.


Above: Tilt range of LP2475W. Click for larger versions

The screen offers an impressive array of ergonomic adjustments. There is a decent tilt range (as shown above), along with a large  height adjustment range, 90 degree pivot and full landscape / portrait rotation (all shown below). All these mechanisms are very smooth to operate and the screen feels sturdy and well supported no matter how you adjust it.


Above: Pivot function of screen shown
Below: height and rotation adjustments shown. Click for larger versions

Materials are all of a very high standard and the build quality feels excellent. It's a professional looking piece of kit in my opinion, and would look particularly good wall or arm mounted I think. The screen features an integrated power supply, so no need for any external bricks here. There is no noise or buzzing detectable, and the screen gives off minimal heat, even after long hours of use.


Above: USB ports shown (left) along with range of interface options (right). Click for larger versions

The LP2475W features an integrated 6 port USB hub, with 2 located for easy access on the left hand side of the screen, and the other 4 located next to the wide range of interface options. The back of the screen shows you the interface options available, with DisplayPort, HDMI, 2x DVI, S-video, Composite, component and the USB ports being visible in the above image. The screen is oddly lacking a D-sub VGA interface, but a DVI > VGA cable is supplied for those who need it. It might have been nice for HP to include VGA for connection of some devices and for some older Graphics card support.


Above: OSD operational buttons. Click for larger version

The operational buttons are located along the bottom right hand edge. There is  quick access to 'scan' (for inputs), 'quick select' (to switch between interface), menu (the main menu), auto adjust (for analogue inputs), reset (factory reset quick access) and PiP / POP.


Above: Various OSD menu screen shots

The OSD menu itself is very thorough and easy to navigate. There are many options to choose from, and the buttons are easy to press and select. I've shown a few pictures of the menu above to give you an idea of what is available in some sections. I turned a couple of options off when I first plugged in the screen as I personally found them annoying. The auto-scan for inputs and interface choice confirmation boxes were disabled, but that is down to taste really. The color section includes preset modes for 9300k, 6500k (default), Custom Color (RGB access) and sRGB (simulation).


Above: Factory OSD menu

You can access the factory menu of the LP2475W by holding the menu button down while you turn the screen on. Release 'menu' after about 5 seconds and when you go into the main menu you will see an option for 'service'. Entering this section confirms the panel being used is the LG.Display (LPL) LM240WU4.

 


Colour Accuracy, Black Depth and Contrast

The HP LP2475W utilises an 8-bit H-IPS panel, capable of producing a true 16.7 million colours. The screen uses enhanced W-CCFL backlighting and so it's colour gamut covers 92% of the NTSC colour space.

An important thing to consider for most users is how a screen will perform out of the box and with some basic manual adjustments. Since most users won't have access to hardware colorimeter tools, it is important to understand how the screen is going to perform in terms of colour accuracy for the average user. I restored my graphics card to default settings and set it to its standard profile. The LP2475W was tested at default factory settings out of the box using the LaCie Blue Eye Pro and their accompanying software suite.

Default settings of the screen were as follows:

Monitor OSD Option

Default Setting

Brightness

90

Contrast

80

RGB

n/a

Colour Temperature Mode

6500k


HP LP2475W - Default Settings (Default 6500k Colour Mode)


 

Default Settings

luminance (cd/m2)

357

Black Point (cd/m2)

0.45

Contrast Ratio

793:1

The screens default settings were considerably over-bright, and you could immediately feel this when you started to work with it. Our colorimeter revealed the default luminance to be a pretty high 357 cd/m2, not far off the specified maximum brightness of 400 cd/m2 even! You could tell that you would need to adjust the brightness of the screen straight away. Considering the OSD brightness control was defaulted at 90%, this should be easy enough to adjust later on anyway. With this high luminance value, we recorded the default black depth at 0.45 cd/m2, giving a static contrast ratio of 793:1. This was a little out from the specified 1000:1, which is perhaps a little hopeful for an IPS matrix, but very close to 800:1 which is a decent performance for an IPS screen.

As you can see from the measurements on the left of the image above, the default gamma was actually very good, being only 2% out, and rounded to 2.2 overall; this being the default for computer monitors and for the Windows operating system and sRGB colour space. Despite the default preset colour mode of ''6500k' being selected, the recorded colour temperature was actually only 5553k, quite a way out from the desired value (by 15%), that being the colour temperature of daylight.

In a new test, I wanted to see how much variance there was in the screens contrast as we adjusted the monitor setting for brightness. In theory, brightness and contrast are two independent parameters, and good contrast is a requirement regardless of the brightness adjustment. Unfortunately, such is not the case in practice. We recorded the screens luminance and black depth at various OSD brightness settings, and calculated the contrast ratio from there. All other monitor and graphics card settings were left at default. It should be noted that we used the BasICColor calibration software here to record these, and so luminance at default settings varies a little from the LaCie Blue Eye Pro report.

OSD Brightness

Luminance
(cd/m2)

Black Point (cd/m2)

Contrast Ratio ( x:1)

100

356

0.45

790

90

355

0.45

789

80

315

0.40

788

70

282

0.36

783

60

255

0.33

774

50

231

0.29

797

40

207

0.27

765

30

181

0.23

786

20

155

0.20

777

10

129

0.16

807

0

103

0.13

793

As you can see from the above results, the control of the screens luminance via the OSD menu was very good. The default 90% OSD setting gave a luminance value of around 355 cd/m2 as we have discussed already. As you lower the brightness control in the menu, the voltage sent to the CCFL backlighting is reduced, and therefore the backlight intensity is reduced as well. The luminance ranges down to 103 cd/m2 when brightness is set to 0%. Even if proper calibration is not possible, you can get a comfortable luminance of the screen at around 10% brightness setting, which is re-assuring.

While brightness is reduced, the black depth improves quite nicely as well, reaching a very impressive 0.13 cd/m2 at 0% brightness. This is very respectable for an IPS matrix, and the best black depth we have recorded on such technology so far in our reviews. During these brightness changes, the contrast remains pretty static and within the range of 774:1 to 807:1. Very good performance in this regard, showing that with proper backlight adjustments you can achieve not only comfortable settings for every day use, but retain a decent contrast and black point throughout the range.

The results were plotted on the above graph, showing the contrast stability of the screen. You can adjust the brightness setting to anywhere within the 0 - 100% range without really impacting contrast ratio. As you reduce the brightness setting, luminance is adjusted nicely, and black depth improves as one would hope.
 

Testing with the colorimeter revealed the graph on the right hand side above, showing DeltaE (dE 94) values across 16 shades. As a reminder, the lower these bars down the Y-axis, the better, in terms of colour accuracy. For reference, LaCie describe the DeltaE readings as:

  • If DeltaE >3, the color displayed is significantly different from the theoretical one, meaning that the difference will be perceptible to the viewer.

  • If DeltaE <2, LaCie considers the calibration a success; there remains a slight difference, but it is barely undetectable.

  • If DeltaE < 1, the color fidelity is excellent.

As you can see from the graph, the default results were not that great. DeltaE on average was 4.5, meaning the colours displayed were considerably out from the requested colours overall. Maximum dE even ranged up to 11.1, so you are definitely going to need to calibrate this screen if you intend to do any colour critical work. This is quite a common situation in todays market, especially where extended gamut backlighting is used. In contrast, the IPS based Hazro HZ26Wi we recently tested showed much better colour accuracy out of the box, showing that perhaps the HP was not particularly well configured in the factory. This of course need not matter if you have access to a hardware colorimeter device, but for those without, it might be a consideration to take into account.

The graph on the left hand side (recreated here as well) shows the CIE diagram which represents the colour space which the monitor is capable of displaying. The LP2475W uses enhanced  wide colour CCFL (W-CCFL) backlighting which offers a colour space (gamut) covering 92% of the reference NTSC space. On the above diagram, the black triangle represents the monitors colour gamut, and it stretches considerably beyond the reference triangle of the sRGB colour space. The sRGB colour space covers about 72% of the NTSC colour space for those interested.


HP LP2475W - Default Settings (Custom Colour Mode)


 

Default Settings

luminance (cd/m2)

394

Black Point (cd/m2)

0.45

Contrast Ratio

875:1

We tested the screen again after simply switching to the "custom colour" mode in the OSD. This allows access to the RGB controls for calibration and moves the screen away from the preset 6500k mode. To the naked eye, the image looked a little more blue, and a little less yellow, and testing with the colorimeter actually revealed a slight positive change on the most part. Luminance was actually increased to 394 cd/m2 resulting in an even better contrast ratio of 875:1, but being a little less comfortable for prolonged use. Colour temperature was actually nearer to the desired 6500k than it was using the 6500k preset mode (!!) and gamma still remained very accurate at 2.2 (1% out now). Colour accuracy was also improved a little, with maximum dE reduced from 11.1 down to 9.5, and average dE was now 4.3 instead of 4.5. Not a massive change overall, but even if it's just for the sake of a better colour temperature, it's worth switching to the 'custom colour' mode from the off-set.


HP LP2475W - Default Settings (sRGB Simulation Mode)


 

Default Settings

luminance (cd/m2)

232

Black Point (cd/m2)

0.45

Contrast Ratio

875:1

The LP2475W offers a supposed sRGB simulation mode via the OSD menu as well, so we wanted to test how this performed, again with everything else left at default. The screen immediately looked darker and slightly more 'murky' to the eye, and the colorimeter revealed luminance was reduced down to 232 cd/m2 now. Colour temperarture moved further away from the desired 6500k (being 16% out now) and colour accuracy didn't really change. The main thing this mode is supposed to do is simulate the sRGB colour space, which is important for those not wanting to work with extended colour spaces. Strangely, this mode did nothing for the screens gamut, and the CIE diagram on the left shows the colour space remains considerably larger than the sRGB reference triangle! I am left to assume that all this mode really does is darken the image! Very odd...

 


HP LP2475W - Calibrated Settings

Monitor OSD Option

Adjusted Setting

Brightness

17

Contrast

65

RGB

251 / 235 / 242

 

Calibrated Settings

luminance (cd/m2)

118

Black Point (cd/m2)

0.17

Contrast Ratio

694:1

I calibrated the screen using the LaCie Blue Eye Pro software package and hardware colorimeter. During the process, the OSD settings were adjusted, forming a small part of the overall calibration proceedings. Brightness was adjusted down to a value of 17, contrast was reduced to 65, and RGB values were changed to 251, 235 and 242 respectively. The calibration process then automatically makes adjustments at a graphics card Look Up Table (LUT) level, before creating and activating an ICC profile. There is no hardware level LUT correction with the LP2475W, which some premium colour critical screens in this sector do offer. Immediately to the naked eye you could feel the difference, with the main obvious adjustment being the far more comfortable and sensible luminance setting. Colours also looked more even to the naked eye.

Testing with the colorimeter confirmed our initial impressions. Luminance was now a far more comfortable 118 cd/m2, gamma was corrected perfectly to 2.2 and colour temperature was now less than 0.5% out at 6503k. Since we altered the OSD brightness control during the manual calibration stages to 17%, the automated LUT adjustments didn't need to alter the luminance much. We already knew from our contrast stability tests that a brightness level of around 10% was optimum for 120 cd/m2. With this adjustment, black depth was improved quite nicely from the default 0.45 cd/m2 to a very impressive 0.17 cd/m2. This is the best result we have tested from an IPS based screen, and a static contrast raito of 694:1 is very admirable. It looks like finally IPS panels might have overcome their main traditional weakness and can now offer decent black depth. Subjectively, it was impossible to detect only the first 2 shades of grey on the scale from 0 - 255 (255 being pure white). I followed the useful tests here, where the first square you could distinguish on the LP2475W was number 3 (just).

Impressively, the calibration also improved colour accuracy no end. Average dE was now only 0.3, and maximum was  down to 0.5. This was a massive improvement, and actually the best colour accuracy results we have obtained in our reviews! This even beats the Hazro HZ30W which recently became our champion in this regard with average dE of 0.3 and maximum of 0.8.

Testing the screen with various colour gradients showed smooth transitions both horizontally and vertically, and no real sign of even slight gradation. There was certainly no banding issue here.

 

If I compare the colour accuracy results of the LP2475W with the other 24"+ sized screens we have tested, I see the above graph. As you can see, while the default colour accuracy overall was not that good, the calibrated results were excellent. The average dE results before and after were actually identical to the Hazro HZ30W, but the HP LP2475W had the slight edge after calibration as we have discussed above. All in all, calibraiton was a great success. You can be confident of some very good colour rendering capabilities from this screen, but you are going to have to invest in a hardware colorimeter if you want the best from it.

If we compare the calibrated black depth of all the 24"+ models we have tested, you can see the LP2475W performs very well here. The results here are perhaps not what one might expect in the battle of TN Film vs IPS vs PVA vs MVA however! The best black depth after calibration we have here is from the TN Film based (and very cheap) Samsung SM245B (0.16), only just ahead of the H-IPS based LP2475W (0.17)! Who would have thought that TN Film and IPS technology would beat VA matrices in this regard?! True, VA panels, particularly PVA panels, are more consistently impressive in terms of black depth, but with advances like this in H-IPS, and particularly TN Film, it seems PVA panels could be getting a run for their money very soon. The best performing PVA panel here was that used in the Dell 2408WFP (0.18), with the ViewSonic VX2435WM representing the S-MVA generation (0.22). I was suitably impressed with the LP2475W in black depth, an area where I previously felt IPS was lacking.

 

 


Viewing Angles



Above: Viewing angles shown from front and side, and  from above and below. Click for larger images

The viewing angles of the LP2475W were very good, as one would expect from an H-IPS based matrix. The field of vision was wide in all directions, and the technology was free of the obvious contrast shifts vertically of TN Film, and the off-centre contrast shift of VA panels. IPS is widely regarded as the choice for colour critical work because of its wide viewing angles, and the LP2475W did not disappoint in this regard. The panel does not feature an Advanced True Wide (A-TW) polarizer, and so you can spot the characteristic white glow of H-IPS on dark backgrounds, when viewed from extreme angles. In practice, I doubt you'd ever even spot this since you would be very unlikely to view the screen from such an odd position.

 


Panel Uniformity

Measurements of the screens luminance were taken at 35 points across the panel on a pure white background. The measurements were taken using BasICColor's calibration software package, combined with the LaCie Blue Eye Pro colorimeter. The above uniformity diagram shows the difference, as a percentage, between the luminance recorded at each point on the screen, as compared with the reference point of a calibrated 120 cd/m2. This is the desired level of luminance for an LCD screen in normal lighting conditions, and  the above shows the variance in the luminance across the screen compared with this point. It is worth noting that panel uniformity can vary from one screen to another, and can depend on manufacturing lines, screen transport and other local factors. This is only a guide of the uniformity of the sample screen we have for review.

As you can see from the above report, the screen was, on the whole, pretty uniform, being between 5% either side of the target luminance of 120 cd/m2 across most of the screen. The luminance did drop a little towards the right and left hand edges, and particularly towards the very bottom of the screen. The readings reached as low as 98 cd/m2 in the lower left hand corner, but this minor difference was nothing to be particularly worried about.


Above: All black screen in darkened room. Click for larger version

Setting the screen to an all black background and dimming the lights resulted in the above. There was very little difference across the screen that you could detect with the naked eye, and only a very slight leakage of the backlight towards the top right hand corner of the screen. In practice this was almost impossible to detect, and thankfully the screen was free from any leakage along the top and bottom edges, where it can be particularly problematic and off-putting in movies, where black borders are present.

 


Office and Windows Use

The LP2475W offers a nice big 1920 x 1200 resolution to work with, along with a tight pixel pitch of 0.270 mm. This is a tighter pitch than 22"WS, 26"WS and 19"WS format screens, and so text is a little smaller and sharper. There are no preset modes for "office" or "text" which can be handy in varying lighting conditions, and you will definitely want to calibrate the screen, or turn OSD brightness down a lot to get the luminance to a comfortable level for use. There is no analogue interface so I cannot compare that to the digital option. The DVI offered a very crisp and clear image, with sharp text and very good picture quality.

The screen resolution is ideal for side by side split screen working, and the wide range of ergonomic adjustments means the screen can be easily positioned to a comfortable level. The rotate functionality might be handy for some people, but at this screen size I feel it is perhaps a little gimmicky. Height and tilt adjustments are invaluable however.

 


Responsiveness and Gaming

The HP LP2475W was tested using the chase test in PixPerAn, a good bit of software for trying to quantify differences in real terms responsiveness between monitors. As a reminder, a series of pictures are taken on the highest shutter speed and compared. The images below show the best case example on the left hand side, and the worst case example on the right hand side. This should only be used as a rough guide to comparative responsiveness but is handy as a way of keeping a constant test of each screen.


6ms G2G LG.Display H-IPS panel


5ms G2G LG.Display H-IPS panel
 

The LP2475W uses LG.Display's latest 24" H-IPS panel, the LM240WU4. The panel only went intro production in Q1 of 2008 and is so new that it is not even listed on their main module page. Details of the panel are instead available in their latest product catalogue, and in our panel parts database (of course). The module is their latest generation of IPS matrix, and sports a specified response time of 5ms G2G. The LP2475W actually has a specified response time of 6ms G2G, and there's not really much explanation as to why there is a discrepency here. The LP2475W is the first model we have seen which uses this new panel, and perhaps HP have re-measured the response time themselves to provide a figure for their spec list? Regardless, the LM240WU4 is LG.Display's latest generation of H-IPS and so users might expect some top performance as a result.

The H-IPS panel used features Response Time Compensation (RTC) technology, widely used nowadays to boost the response time of transitions across the grey range. These transitions are far more common in practice than a full black > white change, which was previously the fastest response time of an LCD display before these technologies were introduced. As such, a G2G response time is far more suitable for understanding the potential responsiveness of the panel in practice than an ISO black > white response time is.

In the above tests, the LP2475W performed very well. It remained very close to the Hazro HZ24W in these tests and we've already touched on the fact that the panel is 5ms G2G rated, so there is no real reason to separate the Hazro and HP models here, despite their quoted spec. The Hazro HZ24W actually showed a slight white halo-ing behind the moving car, indicating a slight over-shoot of the RTC impulse. This can be fairly common on heavily overdriven displays, and is down to the RTC control being slightly off. It was hardly noticeable in practice, but our tests capture this a little bit in the best case (left) image.

In contrast, the LP2475W didn't show any of this, but did show a slight dark trail behind the moving car. This was evident if you looked closely at the moving image, even without capturing it with the camera. You can see this dark trail behind the speech bubble and the yellow man's head in the above images. This reminded us of an issue we looked at a little while ago with the Dell 2407WFP-HC where an 'overshoot' of the RTC impulse was causing some very obvious inverse ghosting artefacts. I tested the screen in a similar way to how we tested the 2407WFP-HC and saw some slight black trailing behind a white mouse cursor, as it moved across a dark grey background. I don't want to make too big a fuss of this, since I don't feel that it is nearly as obvious or distracting as it was with the 2407WFP-HC - which was effectively discontinued because of this issue. It is worth noting in this review since you can spot the dark trailing image in the PixPerAn tests. Whether this is more of less distracting than a white trailing on other screens is down to the user, but in practice it was pretty hard to spot really.


6ms G2G LG.Display AS-IPS


5ms Samsung TN Film


6ms G2G Samsung S-PVA

I've included the same PixPerAn tests for the Samsung SM245B, Dell 2408WFP and NEC 20WGX2 (our reference monitor for these tests) so you can compare. As you can see, the HP LP2475W was not far behind the performance of the NEC, providing you discount the RTC overshoot artefacts we have discussed above. The Samsung SM245B uses a non-overdriven TN Film panel and the difference is quite obvious. The 6ms G2G Dell 2408WFP is a fair bit slower than some other S-PVA panels from the same generation, but I have included it here since it is a very popular screen right now.

The screen thankfully features a wide range of hardware level aspect ratio control, accessible via the OSD menu. There were options for "fill to screen", "fill to aspect ratio" and "one to one". I tested all of these using various gaming resolutions and they seemed to work nicely without issue. Testing the 1:1 aspect ratio mode with external devices using the main HD resolutions (720 and 1080) showed they were scaled properly and with no stretching vertically or horizontally.

As usual I tested the screen in clone mode with a CRT to determine the level of input lag. This is something which can put off some gamers and is a delay between graphics card and monitor output. By hooking up a CRT you can show that  the LCD lags behind somewhat, which can affect users in some situations where they rely on the screen image being as fast as their inputs (e.g. fast FPS shooting games). Often, input lag is very low and probably wouldn't represent too much of a problem in real terms.

The HP LP2475W performed pretty well in this test, with an average input lag of 25ms being recorded. The input lag ranged from 10 - 40ms but never got above or below this. The 25ms on average is pretty good and represents very little problem in practice, especially if you compare it to the results of other 24"+ models. It's not quite as good as the Samsung SM245B, Hazro HZ30W or Hazro HZ26Wi (all at 7.5ms average), but remains a long way ahead of some very popular 24" screens such as the Dell 2408WFP A00 (64.1ms) and Samsung SM245T (52.5ms).

 


Movies and Video

The following summarises the HP LP2475W's performance in video applications:

  • Large 24" screen size and widescreen aspect ratio make it great for watching movies

  • Large 1920 x 1200 resolution support for high definition content (supporting 1080p)

  • The resolution can be a problem however since any SD content needs to be scaled up, and the resolution means any imperfections and pixelation are accentuated even further. Not necessarily a good screen for watching anything from close up

  • Wide viewing angles thanks to the H-IPS panel, good for several viewers watching at once

  • Very good black depth mean detail in darker scenes is not lost. Very good in this regard for an IPS matrix

  • Decent panel responsiveness ensures no ghosting and minimal blurring in fast moving scenes. Any slight inverse RTC overshoot not apparent in video applications

  • Panel uniformity is good overall. No obvious leakage and no problems along top or bottom edges where it is most apparent in movies with black borders

  • HDCP is strangely not listed in HP's specification for the LP2475W which could cause problems for people wanting to watch encrypted content. I tested the screen however with a Blu-Ray source which played fine over both DVI and HDMI. I don't have other sources to test, but it looks like HDCP is included after all

  • HDMI, DisplayPort, component, composite and S-video interfaces provided for connecting external devices

  • Noise is noticeable due to the screen size and resolution, and particularly apparent with low definition content. You need to sit a fair distance away to get away from this

  


Conclusion

Overall I was very impressed by the performance of the LP2475W. While default colour accuracy was pretty poor, once calibrated the screen offered the best colour results we have seen in our reviews. Black depth was excellent for an IPS matrix, and even out-did many PVA matrices we have tested! These were very positive improvements for IPS technology, and hopefully this is a sign of things to come. The screens massive range of ergonomic adjustments and interfaces was also nice to see, and the HP had a very "Dell feel" in terms of finish, functionality and features. Responsiveness was very good, but there was some slight RTC overshoot which caused some dark artefacts in practice. However, the decent pixel responsivenss, combined with pretty good input lag, could make this a good screen for gamers, as well as those wanting an excellent all round performer. If you want a 24" monitor, this is a hard one to beat in my opinion. Given the extreme lack of IPS in this sector, HP are probably on to a winner here.
 

Pros

Cons

Excellent colour accuracy once calibration

Poor default colour accuracy

Excellent black depth, especially for an IPS panel

Some RTC overshoot causing some slight inverse trailing

Very wide range of interface and ergonomic options

Couple of missing features such as D-sub interface and A-TW polarizer

 

 

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