Philips 272P4APJKEB 해외 리뷰 - Adam Simmons

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Reviews

Philips 272P4APJKHB (272P4APJKEB)

Author: Adam Simmons
Date published: September 19th 2015

Introduction

The 2560 x 1440 (WQHD) resolution and IPS-type panels are both popular choices amongst consumers at the moment who demand strong colour reproduction characteristics. Usually such models come with an enhanced phosphor WLED backlight, providing excellent coverage of the sRGB colour gamut and some extension beyond this. But a few models provide even more, with comprehensive coverage of both the sRGB and Adobe RGB colour space. The not-so-catchily named Philips 272P4APJKHB (referred to as the P272P4APJKEB in North America) uses an RB-LED with red diodes in addition to the usual blue diodes, plus a green phosphor coating, to provide such capability. We take this monitor for a spin using our usual testing suite. This includes a range of game and movie titles – ones which aren’t really designed with extended colour spaces in mind and that provide some interesting food for thought if you’re considering this monitor in a ‘non-professional’ (or ‘non colour-critical’) capacity.

Specifications

This model features a 60Hz 27” AHVA (Advanced Hyper-Viewing Angle) panel from AUO, with a 2560 x 1440 resolution. This uses 8-bit plus 2-bit FRC colour reproduction, providing an effective 10-bits in total. A 5ms grey to grey response time is specified, although this should of course be approached with scepticism. Key ‘talking points’ of the specification have been highlighted in blue below.

Screen size: 27 inches

Panel type: AUO M270DAN02.1 AHVA (Advanced Hyper-Viewing Angle) LCD

Native resolution: 2560 x 1440

Typical maximum brightness: 350 cd/m²

Colour support: 1.07 billion (8-bits per subpixel plus dithering)

Response time (G2G): 5ms

Refresh rate: 60Hz

Weight: 7.5kg

Contrast ratio: 1,000:1 (50m:1 Dynamic Contrast’)

Viewing angle: 178º horizontal, 178º vertical

Power consumption: 36.95W typical

Backlight: RB-LED (Red Blue Light Emitting Diode)

Typical price as reviewed: £560 ($499.99 USD)

Features and aesthetics

From the front we see a sensible and functional design shared by some older Philips models, such as the 272P4QPJKEB. The bezels are chunky black plastic with a brushed metal texture – 20mm (0.79 inches) at the sides, 26mm (1.02 inches) at the top and 40mm (1.57 inches) at the bottom. This gives the included self-assembly monitor hood, which is designed to reduce glare, something to grip onto. This hood also has a small hatch at the top to feed through a calibration device such as a colorimeter. The screen surface on this model is very light matte anti-glare (‘semi-glossy’, some would call it).

Other features to note from the front include a microphone and 2.0 megapixel webcam in the centre of the top bezels. These are covered by the monitor hood if you’re using it, so you can’t use them with the hood on (it’s easy to detach and re-attach). The webcam has a small white activation LED when it is in use. Note that a USB upstream cable has to be connected for the webcam to function. On the left side of the bottom bezel there is a 3.5mm headphone jack, pointing downwards. In the central region there are 2 infrared sensors. These so-called ‘Power Sensors’ detect if somebody is close to the monitor and therefore considered to be using it. If not the screen dims considerably until the user returns. Note that the camera picks up a small LED light here, but this is at a wavelength invisible to the naked human eye. At the bottom right of the bottom bezel there are touch-sensitive OSD (On Screen Display) controls, a touch-sensitive power button and a very small white power indicator (flashes when on standby). These controls proved reasonably responsive, more so than some touch-sensitive solutions. The following video runs through the features of the OSD.

Testing the presets

Philips have included their usual ‘SmartImage’ presets. There are also plenty of other options that can be manually tweaked in the OSD. Rather than running through all of the ‘SmartImage’ presets, some of which are quite similar to one another and don’t really add much positive to the image, we’ll look at various other setting combinations. The table below shows our observations and some readings (gamma and white point) taken using a Datacolor Spyder5ELITE colorimeter. The monitor was left in its ‘plug and play’ state, connected to a Windows 10 PC. It was connected to an Nvidia GTX 970 via DP 1.2, but our observations using other digital connections and with a modern AMD GPU were similar.

Preset Mode	Gamma (central average)	White point (kelvins)	Notes
Gamma = 1.8	1.8	7323K	Very bright with a washed out look, overall, and an obvious ‘cool green’ tint (i.e. green and blue channel too strong relative to red). In amongst the washed out look there are some obviously oversaturated shades as well that stand out like a sore thumb due to their bright neon brilliance.
Gamma = 2.0	2.0	7311K	As above but improved depth. A much richer look overall and definite oversaturation of shades in non-colour managed applications (i.e. those designed to be viewed by displays with sRGB colour spaces).
Gamma = 2.2 (Factory Defaults)	2.2	7491K	As above but some more depth. An unmistakably vibrant look to the image, oversaturation with respect to sRGB content.
Gamma = 2.4	2.4	7279K	Now the depth has been cranked up even more. Some shades now appear a fair bit too deep.
Gamma = 2.6	2.6	7252K	As above but considerable extra depth – far too much in places. This makes for some stunning vibrant shades, but this isn’t useful unless you’re specifically targeting such high gamma.
Color Temperature = 5000K	2.2	5761K	This is cooler than the ‘5000K’ target by quite some margin. However; it does give the image a warm look and hugely cuts down the blue colour channel and hence blue light output from the monitor. It’s essentially a ‘Low Blue Light’ setting.
Color = Adobe RGB	2.2	7892K	As factory defaults, but slightly dimmer and some of the ‘sRGB oversaturation’ is cut down. The green tint is also reduced significantly, although the image is noticeably cool with a strong blue-bias. This is an emulation mode is useful for work within the Adobe RGB colour space, but it will require rebalancing with a colorimeter to try to correct the colour channel imbalances.
Color = sRGB	2.2	7891K	This is an sRGB emulation mode, significantly cutting back on the colour gamut and hence saturation. Some colours actually appear weaker (less saturated) than they should and overall the image looks quite washed out. This isn’t just with respect to this monitor running its native colour gamut, but also most ‘standard gamut’ models we’ve looked at recently.
Color = User Define	2.2	8059K	As per factory defaults, but even brighter and with a fairly overpowering blue tint.
SmartImage = SmartUniformity	2.2	7711K	As per factory defaults in terms of saturation levels, but the green tint is increased such that it appears almost ‘sickly’. This is readily noticeable by eye even if this is the only screen you’re looking at, although your eyes do adapt to this somewhat over time. The image is also a fair bit dimmer. You would ideally adjust brightness and colour balance, but that could potentially nullify the uniformity corrections made here which are only really valid as per the brightness and other parameters used by default with this mode.
Test Settings (as below)	2.2	6503K	The brightness is now much more comfortable and overall colour balance and white point improved by manual colour channel correction. There remains oversaturation of non-colour-managed sRGB content. This is very different to oversaturation you can achieve by using a ‘saturation’ slider (Nvidia Digital Vibrance or a similar setting on the monitor OSD) as we explore later.

Out of the box the image on the P272P4APJKHB (P272P4APJKEB) was highly bright and saturated, with excellent gamma handling but quite an ‘off’ white point. Across all of the settings we tested, in fact, the gamma handling remained excellent or right where it should be – the gamma shown on the OSD was the gamma you got, with good tracking against the reference curves. The white point, on the other hand, was some way off the mark. The image looked either very cool and green, or simply extremely cool – this was clear by eye, not just from what the colorimeter was saying. Each individual unit is factory calibrated to provide strong gamma tracking and high levels of colour accuracy, with a unique calibration report accompanying each unit. This is shown for our review sample below – note that no promises are made with regard to white point, only absolute colour accuracy and gamma tracking.

There are also two emulation modes included, designed for users doing colour-critical work within a given colour space; ‘sRGB’ and ‘Adobe RGB’. The white point remained way off target in both emulation mode, but the colour gamut (explored later) was restricted as intended. For our test settings we made use of the full native gamut of the monitor, lowering brightness and manually adjusting colour channels as explored below. As below the gamma tracking was spot, so no need to adjust the gamma setting or tweak anything else for our uses.

Gamma test settings

Test settings

As mentioned previously, the white point required some correction and the brightness lowering. Other than that, things were right where we wanted them for our testing. Any setting not mentioned below was left at default.

Brightness= 34 (according to preferences and lighting)

SmartResponse= Fast

Color= User Define

R= 100

G= 95

B= 90

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