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BenQ XL2420T review: BenQ XL2420T

Review Sections

Performance LCD tests

After calibrating to a target brightness of 140cd/m² with an X-Rite i1Display 2, Eye-One Match 3 and tweaking with HCFR, the XL2420T was run through the LCD tests.

Image tests
Contrast Sharpness Gamma Black level White saturation Gradient
Pass Pass Pass Pass Pass Very slight banding, purple discolouration at dark end of the gradient.

The XL2420T did reasonably well with the basic tests, only showing slight problems with the gradient test.

Inversion pixel walk tests
Test 1 Test 2a Test 2b Test 3 Test 4a Test 4b Test 5 Test 6a Test 6b Test 7a Test 7b
Turns green Turns green Pass Turns purple Turns purple, slight flicker Turns purple Pass Pass Pass Turns purple Turns purple

While we're usually looking for flickering in these tests, the XL2420T had a bizarre property of turning images that are meant to be greyscale either purple or green. We've only seen this once before, with the Asus PA246, an IPS screen.

Input lag

Measured against a Samsung SyncMaster 975p CRT, and using a Canon 40D set to a shutter speed of 1/320, an average of over 60 photographs were taken using StoppUhr. Lag time was completely negligible — the XL2420T is definitely good for gaming.

HDMI performance

While a monitor might have an HDMI port, there's no guarantee that it'll display images as expected. We hooked up a PlayStation 3 and checked for 24p capability and judder, as well as running the HQV Blu-ray test to see how well it coped with an interlaced source and noise.

24p capable Understands YUV Mission Impossible III
scene 11 judder test
Mission Impossible III
scene 14 judder test
Yes Yes Judder Judder
HQV noise
HQV video
resolution loss
HQV jaggies
HQV film
resolution loss
HQV film
resolution loss —
stadium score
Total score
out of 100
0 0 0 0 0 0

The XL2420T copes best with progressive input, and is probably best suited for gaming consoles. For movie watching, it doesn't provide the best experience from a dedicated device over HDMI.

Viewing angles

Viewing angles were taken with a Canon 40D in spot-metering mode, with only shutter time adjusted to obtain a good exposure.

View full gallery

As you can see, images quickly become washed out as we turn to the side, common for TN panels. Interestingly, the colours invert sooner on the bottom vertical than usual, then flipping back to normal when you go past this point.
(Credit: Craig Simms/CNET)

Light bleed

The XL2420T isn't the best when it comes to light bleed — on a pure black screen, obvious bleed entered from all sides on our review sample.

It's important to note that the effects of light bleed will likely change from monitor to monitor, regardless of make.

Power consumption

We measured power consumption using a Jaycar mains digital power meter. It's important to note here that, due to limitations of the meter, measurements are limited to values of 1W and greater, and are reported in 1W increments.

All measurements, screen brightness and contrast were set to 100 per cent, and a test image was displayed.

Juice Box
Maximum power draw 24W
Power-saving mode

BenQ has focused highly on power efficiency in the last few years, and it shows again with the XL2420T.


The XL2420T is covered by BenQ's fantastic four-year, zero-dead pixel, on-site pickup warranty.


Despite the extra frills, the XL2420T isn't a massive jump, performance wise, above the XL2410T. Just like its predecessor, it suffers from light bleed, as TN panels are wont to do due to lower manufacturing tolerances, and the colour shifting on the inversion tests is a little worrying. Despite the screen's issues, the 120Hz mode is still gorgeous, and the panel is highly responsive for gaming. If seriously smooth gaming performance is your only concern, take a look.

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