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- 4K400STx vs LS751HD
Optoma 4K400STx vs ViewSonic LS751HD
What 4K400STx does better (4) and where LS751HD wins (5) — every spec side by side.
Dimensions
Size comparison
4K400STxLS751HD
| 4K400STx | LS751HD | Difference | |
|---|---|---|---|
| Height | 118 mm | 132 mm | −14 mm |
| Width | 315 mm | 337 mm | −22 mm |
| Depth | 270 mm | 265 mm | +5 mm |
| Weight | 3.9 kg | 4.5 kg | −0.6 kg |
Drawn to the same scale from the official dimensions (front and side).
Why is 4K400STx better than LS751HD?
- Resolution (on screen)3840 × 2160 (4K UHD) vs 1920 × 1080 (Full HD)
- Contrast ratio (dynamic / claimed)1,000,000:1 vs 300,000:13.3×
- Fan noise28 dB vs 32 dB+14%
- Weight3.9 kg vs 4.5 kg+15%
Why is LS751HD better than 4K400STx?
- Light source life4,000 h vs 20,000 h5×
- Brightness (ANSI / ISO lumens)4,000 lm vs 5,000 lm+25%
- Lens shiftNone vs Vertical
- Ethernet (LAN)No · 4K400STx: Yes
- Power consumption320 W vs 245 W+31%
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) | 4,000 lm | 5,000 lm |
| Contrast ratio (dynamic / claimed) | 1,000,000:1 | 300,000:1 |
| HDR support | Yes | Yes |
| Motion interpolation (MEMC) | Yes | — |
| 3D playback | Yes | Yes |
| Gaming | ||
| Maximum refresh rate | 120 Hz | 120 Hz |
| Game / low-latency mode | Yes | — |
| Lens & placement | ||
| Throw ratio | 0.5:1 | 1.4:1 |
| Throw ratio (zoomed in) | — | 2.24:1 |
| Throw type | Short throw (0.4–1.0:1) | Standard throw (1.0:1 and longer) |
| Distance for a 100″ 16:9 image | 1.11 m | 3.1 m |
| Smallest image size | 33″ | 30″ |
| Largest image size | 300″ | 300″ |
| Optical zoom | — | 2× |
| Lens shift | None | Vertical |
| Keystone correction | Yes | Yes |
| Automatic keystone correction | No | 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) | No | Yes |
| VGA input | No | No |
| Audio output | Yes | Yes |
| Battery, power & lifetime | ||
| Power consumption | 320 W | 245 W |
| Light source life | 4,000 h | 20,000 h |
| Light source life (eco mode) | 15,000 h | 30,000 h |
| Design & noise | ||
| Fan noise | 28 dB | 32 dB |
| Fan noise (eco mode) | 24 dB | 29 dB |
| Weight | 3.9 kg | 4.5 kg |
| Width | 315 mm | 337 mm |
| Height | 118 mm | 132 mm |
| Depth | 270 mm | 265 mm |
| Colours | White | White |
