HDMI Widescreen LCD Monitor HDMI Widescreen HDTV MonitorHDMI Widescreen Full HD LCD Monitor
Generally, HDTV monitor was a term used to describe now-defunct HDTVs with no digital tuner; that is, they had higher resolution than the typical 480i, but they only had an analog TV tuner and could only make use of that higher resolution when connecting an external source with HD resolution (Blu-Ray, HD cable, etc.), using the component, RGB, DVI, or HDMI input. Now, HDTV monitor can mean a HDTV that is also designed for ease of use as a computer monitor, usually referring to certain HDTVs in the 19 to 24 range. Such a display will have a TV tuner built in as well as VGA and HDMI inputs for use with a PC, all in a form factor similar to LCD monitors. The Full HD designation only means that the monitor has a resolution of at least 1920x1080, which is the digital resolution of 1080p, the highest current HDTV standard. (As an aside, technically almost all PC monitors for the last decade or two have been HD, but many could not do 1,080 lines of vertical resolution). And just because a monitor has HDMI input does NOT mean that it is full HD, or at least 1920x1080.
HDTV would mean that it has a TV tuner built in. Full HD means that it would have a 1080p resolution (but is mostly just marketting)
On paper, they look similar. Just very slight differences (viewing angle, for instance, and response time). One possibility: They're calibrated differently. If the difference you're noting is that the first is vivid and bright, recognize that there are adjustments you can make to the second to increase brightness, contrast, and color saturation. Beyond that, there may be specs that aren't listed that are affecting performance. I assume you're viewing both under the same lighting conditions, and they're both connected with the same quality connection (HDMI, for instance). Hope that helps.
