HDTV

Toshiba 55WX800U 55" LED Edge Lit LCD 3D HDTV

ARTICLE INDEX

On The Bench

Equipment used: EyeOne Pro spectrophotometer, CalMAN Professional 3.7 analysis software, Accupel HDG-3000 signal generator, Oppo BDP-83 Blu-ray player in Source Direct mode, Spears & Munsil Benchmark Blu-ray disc.

All the picture modes have the same measured color gamut. As you can see below, red is undersaturated and the secondaries are off, most notably magenta. The red luminance is too high which I suspect is intentional to prevent those tones from appearing washed out. The charts below represent the Movie 2 mode.

The gray scale in Movie 2 is quite cool with an average color temp of 8296 Kelvins. Gamma is also well off the mark at 1.51 average. This is affected by the DynaLight and Dynamic Contrast settings which further damage the gamma curve.

After calibration color is improved in the positions of secondary colors and the luminance measurement. Since the gamut is under-saturated, the CMS can’t help the primaries. You can only move color points in to the triangle, not out of it. Luminances are much better however. When the gamut is fairly close to spec like this one, getting the color brightness correct makes a more visible difference than moving the x and y values. I was also able to get the secondaries lined up thanks to the CMS and white balance adjustments.

Post-calibration grayscale is well below the threshold of visibility. I couldn’t get all the points below 1 Delta E, but this is very good performance for an LCD. I tried both the 2-point and 10-point grayscale control sets and found no difference in the final result. Gamma is flatter but even at the lowest setting; the best average number I could achieve was 2.03. The tracking is reasonably flat and the image looked quite contrasty despite the low number.

Video processing showed below-average results in my tests. The TV failed all video-mode source adaptive tests. Film-based material was a little better but it took over a second to lock on to any form of 3:2 cadence. To be fair, I consider video processing in a display to be largely irrelevant. With a good source device, you won’t need it. Motion-adaptive performance was OK with average rendering of the jaggies clips. Line twitter in the moving ship was minimal. The WX800 will process 24Hz signals in 10:10 pulldown mode when Film Stabilization is set to Standard. Using the higher settings for Film Stabilization caused very obvious artifacts in moving wedge patterns and real content no matter what the input signal. I recommend turning on the 240Hz ClearFrame option for all content. Leaving the TV in straight 60 Hz mode causes obvious judder and motion blur.

Contrast performance was excellent with a minimum black measurement of .01 foot-Lambert and a peak of 36.84 foot-Lamberts in the Movie 2 mode yielding an on/off contrast ratio of 3684:1. When DynaLight was turned on, the black level was immeasurable. DynaLight alone had a positive effect on image quality increasing dynamic range without crushing detail. Using the Dynamic Contrast did crush detail on any setting above zero. The highest measured light output was over 96 fL in the Sports mode. Like any LCD, you can really crank up the lumens when using the TV in a brightly-lit room. White field uniformity was excellent with no visible color shifts anywhere on the screen. Darker full-field patterns revealed hot spots in the upper half of the panel. It was especially noticeable in the corners. With a small amount of room light, this flaw became almost invisible. I recommend this TV not be watched in total darkness. A backlight of around 4 foot-Lamberts would be best.