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- UHD55 vs LS751HD
Optoma UHD55 vs ViewSonic LS751HD
What UHD55 does better (3) and where LS751HD wins (3) — every spec side by side.
Why is UHD55 better than LS751HD?
- Resolution (on screen)3840 × 2160 (4K UHD) vs 1920 × 1080 (Full HD)
- Contrast ratio (dynamic / claimed)1,200,000:1 vs 300,000:14×
- Fan noise28 dB vs 32 dB+14%
Why is LS751HD better than UHD55?
- Light source life4,000 h vs 20,000 h5×
- Brightness (ANSI / ISO lumens)3,600 lm vs 5,000 lm+39%
- Power consumption317 W vs 245 W+29%
Specifications
Side by side
| Picture | ||
| Resolution (on screen) | 3840 × 2160 (4K UHD) | 1920 × 1080 (Full HD) |
| Native panel resolution | 1920 × 1080 (Full HD) | 1920 × 1080 (Full HD) |
| 4K method | 4K by pixel shifting | — |
| Display technology | DLP | DLP |
| Light source | — | Laser |
| Brightness (ANSI / ISO lumens) | 3,600 lm | 5,000 lm |
| Contrast ratio (dynamic / claimed) | 1,200,000:1 | 300,000:1 |
| HDR support | Yes | Yes |
| HDR formats | HLG | — |
| 3D playback | Yes | Yes |
| Gaming | ||
| Maximum refresh rate | — | 120 Hz |
| Lens & placement | ||
| Throw ratio | 1.21:1 | 1.4:1 |
| Throw ratio (zoomed in) | 1.59:1 | 2.24:1 |
| Throw type | Standard throw (1.0:1 and longer) | Standard throw (1.0:1 and longer) |
| Distance for a 100″ 16:9 image | 2.68 m | 3.1 m |
| Smallest image size | — | 30″ |
| Largest image size | 300″ | 300″ |
| Optical zoom | — | 2× |
| Lens shift | Vertical | Vertical |
| Keystone correction | — | Yes |
| Automatic keystone correction | — | No |
| Sound | ||
| Built-in speakers (total output) | 10 W | 10 W |
| Smart & streaming | ||
| Wi-Fi | — | Yes |
| Connectivity | ||
| HDMI inputs | 2 | 2 |
| HDMI version | 2 | 2 |
| USB port | Yes | Yes |
| Ethernet (LAN) | Yes | Yes |
| VGA input | Yes | No |
| Audio output | Yes | Yes |
| Battery, power & lifetime | ||
| Power consumption | 317 W | 245 W |
| Light source life | 4,000 h | 20,000 h |
| Light source life (eco mode) | 10,000 h | 30,000 h |
| Design & noise | ||
| Fan noise | 28 dB | 32 dB |
| Fan noise (eco mode) | 25 dB | 29 dB |
| Weight | — | 4.5 kg |
| Width | — | 337 mm |
| Height | — | 132 mm |
| Depth | — | 265 mm |
| Colours | White | White |
