Like all UST projectors, the DH765Z has upper and lower limits on image size beyond which it cannot focus clearly. Though it is designed for large screen use and can go up to 150" diagonal, it can also go down as small as 80" as per specs. Actually, our test unit produced sharply focused images about 5% smaller and larger than those official specifications.
Digital signage is another good use for the DH765Z. Because it can be placed so close to a screen, large signage can be displayed in a small enclosure. To increase functionality for signage use, Vivitek offers an option called the NovoDS ($499) which stores up to 6GB of video, photo, and/or data files.
Picture Quality
Data images on the DH765Z showed a lot of pop and contrast. The projector delivers excellent image sharpness from edge to edge within the window of its image size specs. Accordingly, the resolution and alphanumeric characters and graphical elements are exceptionally readable while using small fonts, even with full keystone correction applied if that should become necessary. Photos looked especially good in Presentation mode where color accuracy was a bit better than Bright mode.
Like most DLP projectors, the DH765Z has a Brilliant Color feature which enables you to find the right trade-off between image brightness and color saturation/fidelity for your particular use. The control allows settings from 1 to 10, with 10 being maximum brightness for full ambient light use. In low to medium ambient light conditions, color quality was enhanced by reducing the Brilliant Color setting. At 6, contrast was excellent and, while highlights were a bit subdued, black levels were very good and overall picture quality was optimized for lower light viewing. There was a slight greenish tinge in the factory default video modes, but it was easily suppressed in the color adjustment menu without materially affecting brightness levels.
Technically, the best video quality in terms of contrast and saturation is achieved by turning Brilliant Color off. However, this drops the lumen output by over 50%. From a practical perspective, users might want to experiment with a trade-off that sets Brilliant Color in a medium setting that boost brightness somewhat without compromising color saturation all that much.
Though it is always true that projected video looks best in a dark viewing room, it is particularly true of this projector since lumen output in it optimized video modes will tend to be quite a bit lower than what you might expect from the 3500 lumen rating. On the other hand, when viewed in a dark room in its optimum video configurations, contrast and black levels are solid and the video quality overall is thoroughly engaging.
Performance
Brightness. At this writing Vivitek's US and EU websites rate the DH765Z at 4000 lumens, but their widely circulated pdf promotion sheet lists it as 3500 lumens. Immediately after power-on our test sample delivered about 3,250 lumens. However, we take lumen measurements after ten minutes of warm up, and this projector loses about 20% of its initial brightness during the first minute or two of warmup. The measured ANSI lumens for each color mode were made after a ten minute initial warmup for Normal and Eco illumination settings:Vivitek DH765Z-UST ANSI Lumens
| MODE | ||
| Bright | ||
| Presentation | ||
| Movie |
