The AV Center's jack pack is fairly generous, with three HDMI ports, two component-video inputs, an antenna port for over-the-air or cable, two composite video inputs, an optical digital audio output, and, of course, an HDMI output to connect to the monitor. There's also a USB port but it's for service only.
Overall, the Hitachi UT37X902 performed relatively well, although we did encounter a few hiccups. Its black levels were deep enough compared with other 1080p 37-inch LCDs we tested, and we appreciated the calibration controls that helped hone its color. On the downside it became quite blue in dark areas, and we encountered a few issues with its dejudder and 120Hz processing.
The Hitachi's numerous picture controls allowed us to improve the already fairly accurate Cinema preset to a fine degree. Prior to our calibration, Cinema delivered a relatively linear grayscale, although it did dip into blue territory near black, becoming extremely blue at 5 percent and lower. Afterward it was still fairly blue down there, but the majority of the picture came extremely close to the D65 target, but we would have preferred mid-dark areas, which tended toward red, to be a bit better. Gamma was a superb 2.23 afterward. For our complete picture settings, check out the bottom of this blog post.
Our comparison included a couple of less-expensive 37-inch competitors, the Panasonic TC-37LZ85 and the Vizio VOJ370F, along with the 32-inch Sony KDL-32M4000. Our reference set for color was the Pioneer PRO-111FD, and we used the Sony KDL-46W4100 to compare Smooth processing (no, we don't consider either one competition to the Hitachi). For our image quality tests we watched the Blu-ray version of Iron Man on the PlayStation 3.
Black level: Matched against the other LCDs in our lineup the Hitachi reproduced a comparable shade of black, appearing slightly deeper than the Vizio and about equal to the Panasonic and the 32-inch Sony. In fact the difference between all but the Vizio was really hard to discern, even side by side, and the Vizio itself wasn't too far behind. If we had to choose, watching an extended sequence of dark scenes such as the ones where Stark is confined to a cave in Chapter 3, we'd give the slightest of edges to the Panasonic, followed by the Sony and then the Hitachi, but all three were very close.
Details in shadows on the Panasonic appeared a bit more distinct than on the others, but again the Hitachi wasn't bad, resolving the dark uniforms of the guards in the cave, for example, quite naturally.
Color accuracy: The UT37X902 held its own in brighter scenes, soundly beating the red-tinted Panasonic and also proving a bit better than the other two. When Stark talks to the Air Force guys in Chapter 7, for example, his skin tone an the colors in the background appeared natural enough, albeit a tiny bit greenish compared with the reference. Accuracy suffered in shadows, on the other hand, as evinced by the overly blue fighter in the background and the extremely blue tinge--worse than any of the other displays, in black areas and the letterbox bars. Primary colors, including the green grass outside Stark HQ and the red stripes of the American flag and the blur of the sky, all appeared quite close to the reference.
Video processing: As we mentioned above the Hitachi does include dejudder processing, which can be activated by selecting Smooth 1 in the Film Mode section of the menu. We compared this effect, which was fairly aggressive as dejudder modes go, to the Sony W4100's Standard setting, one of the better dejudder modes in our experience. The Hitachi fared well in most scenes, smoothing out the judder in the slow pan around Stark's lab in Chapter 7, for example, as well as we expected. As always we saw some artifacts in Smooth mode, such as the characteristic breakup effect (where a part of an object seems to detach) behind the wing of the landing fighter at the beginning of the chapter, for example, or the bottles in Stark's fridge a bit later. Neither artifact was visible on the Sony, so we'd definitely give the dejudder edge to the Sony in this case.
According to the manual, Smooth 2 mode is designed for 60Hz sources, so we checked out some fast-moving action--a hockey game and a football game--but couldn't see any difference between the Hitachi's and the other displays' handling of motion. We're not surprised; we've found it hard to see differences in smoothing processing with non-film material on many displays.
We also fed the Hitachi 1080p/24 sources to see how well its 120Hz processing preserved the native cadence of film. Compared with the Sony W4100 (with its dejudder turned off) and the Pioneer (set at its ideal Advance mode for this comparison) the Hitachi lagged behind. During a pan over Stark's workbench around the 28-minute mark, for example, the UT37X902 seemed to evince the same sort of hitching motion we saw on the non-120Hz displays, as opposed to the smoother judder of the Pioneer and the Sony. We double-checked on of our favorite tests for judder, the flyover of the aircraft carrier in Chapter 7 of I Am Legend and once again the Hitachi showed more hitching than the reference displays, but not as much as the Vizio, for example. To our eyes the differences were tough to discern, however.
According to resolution test patterns, the Hitachi failed to properly de-interlace video-based material but succeeded with film, regardless of the picture mode we chose. As we expect from a 1080p display, it resolved every detail of 1080i and 1080p sources. In our motion resolution test, the UT37X902 delivered 300 to 400 lines, which is more along the lines of results we got from 60Hz displays, not 120Hz models. We suspect the difference has to do with Hitachi's 120Hz processing methods, which differ from those of Sony and Samsung, for example. Regardless of the results of test patterns, we found it nearly impossible to distinguish between the resolutions of any of these displays, motion or otherwise, with program material.
Uniformity: The UT37X902 fared well in this department. Its screen maintained even brightness and color across its area, and when seen from off-angle its black levels and color didn't fade as quickly as many LCDs we've seen.
Bright lighting: Hitachi uses a matte screen, which evinced the usual stellar performance under bright lighting conditions. The screen attenuated ambient reflections as well as the other matte LCDs in the lineup and better than the glass-screen plasma.
Standard-definition: The UT37X902 is a mixed bag when it comes to SD processing. The set resolved every line of the DVD format, and details in the stone bridge and grass looked relatively sharp. On the other hand it was as bad as we've ever seen at removing jaggies from moving lines; both a spinning diagonal wedge and the stripes of a waving American flag showed significant jagged edges. The numerous noise reduction options outperformed the other comparable displays in our test, squelching dancing motes and moving lines quite affectively in the strongest settings. Finally, film mode processing kicked in quickly and effectively to remove moiré from the grandstands behind the race car.
PC: The monitor itself has a VGA-style analog input on the back panel, and as the manual indicates, the highest resolution it can accept is 1,366x768. This resolution looked OK on the Hitachi, but we really would have liked to see the analog input go all the way up to 1,920x1,080.
Via HDMI (which we tested via the AV Center, not directly connected to the monitor) the Hitachi performed very well, resolving every line of a 1,920x1,080 source. We did see some edge enhancement we couldn't eliminate however, which made text somewhat less legible, especially at small font sizes.
|Hitachi UT37X902||Picture settings|
|Picture on (watts)||183.73||106.87||N/A|
|Picture on (watts/sq. inch)||0.31||0.18||N/A|
|Cost per year||$56.87||$33.08||N/A|
|Score (considering size)||Poor|
|Before color temp (20/80)||7006/6987||Average|
|After color temp||6511/6507||Good|
|Before grayscale variation||+/- 473||Average|
|After grayscale variation||+/- 170||Average|
|Color of red (x/y)||0.634/0.341||Average|
|Color of green||0.299/0.618||Good|
|Color of blue||0.151/0.062||Good|
|Defeatable edge enhancement||No||Poor|
|480i 2:3 pull-down, 24 fps||Pass||Good|
|1080i video resolution||Fail||Poor|
|1080i film resolution||Pass||Good|
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