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LG Flatron L1710B

The design of LG Flatron L1710B is the same as have just seen by the previous model, only the connectors set has been enhanced. The base (the same bulky base with unadjustable height) carries a two-port USB hub, while the monitor itself has a DVI input and comes together with a corresponding cable. The menu was also the same, except the lack of the LightView feature.

Judging by my visual impressions, I arrived at a conclusion that this monitor had a different matrix. My eyes told me that the response time was somewhat higher, with noticeable ghosting behind moving objects. At the same time, the viewing angles are no better than those of the faster model: white becomes yellowish when you look at the screen sideways, the top of the screen gets dark when viewed from below, and the colors get inverted when viewed from above (black looks like gray). Colors were overall average: the onscreen image faded, although there were no visible stripes in a smooth gradient.

LG’s default brightness and contrast settings sit on 100%. Screen brightness of 100nit is achieved when you set 55% brightness and 80% contrast. The screen brightness is adjusted by modulation of the backlight lamp power with 220Hz frequency.

The menu offers a selection of three color temperatures: 6500K (in reality, it corresponds to 5890K for white and 8250K for gray), 9300K (6780K and 11100K), and user-defined setting which by default coincides with the “6500K” option.

I think you’ve guessed the results of my color calibration: the color curves are very similar to those of the previous monitor:

I can’t say this is ideal (blue is evidently too high), but the curves are smooth enough, and I should acknowledge this monitor to be well calibrated. This also holds true for 100nit screen brightness:

My measuring the response time of this monitor confirmed the supposition that this one is based on an older matrix than the previous model. The total response time was no less than 29msec, which is far from the 16msec declared on the manufacturer’s website. Well, this striking difference occurs on black-white transitions only. When doing black-gray transitions, the monitor showed no more than 36msec, that’s quite close to what the previous model showed.

The brightness and contrast ratio measurements once again proved the point that LG Flatron L1710B has a different matrix: the maximum brightness is a little below the specification (250nit), but the level of black is much higher than that of L1710S. So we’ve got a contrast ratio of 120:1.

Regrettably, this monitor is yet another proof to my suspicions that the manufacturer can use different matrixes in monitors with one model name. I guess the particular specimen belonged to an older batch as it has an older matrix (it is older, not just different, as there are no obvious advantages over the matrix of the above-described L1710S), but also lacks the LightView feature. I also suppose that fresh batches use another matrix, and the monitor is an analog of the L1710S with a USB hub and a DVI input. Unfortunately, I can’t yet confirm my suppositions, and I only advise you to be careful when shopping for an LCD monitor from LG – the models that use the older matrix are much worse than those with the newer one across a number of parameters like response time, viewing angles, color reproduction, contrast ratio.

There is one more interesting thing I’d like to point out to you. The L1710B (with an old matrix) loses greatly to L1710S (with a new matrix) in the nominal response time (i.e. measured on black-to-white pixel transitions), but closes the gap on black-to-gray transitions. That’s why we don’t see the effect those 16msec should have provided: they are not much faster than older matrixes as far as average response time is concerned. So the ghosting effect – those trails behind moving objects – is still here. The manufacturers have to develop new matrixes that surpass the older ones on black-gray transitions, too, to eliminate ghosting altogether.

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