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- TH685i vs PX748-4K
BenQ TH685i vs ViewSonic PX748-4K
What TH685i does better (2) and where PX748-4K wins (6) — every spec side by side.
Dimensions
Size comparison
TH685iPX748-4K
| TH685i | PX748-4K | Difference | |
|---|---|---|---|
| Height | 110 mm | 108 mm | +2 mm |
| Width | 312 mm | 312 mm | = |
| Depth | 225 mm | 222 mm | +3 mm |
| Weight | 2.8 kg | 2.8 kg | = |
Drawn to the same scale from the official dimensions (front and side).
Why is TH685i better than PX748-4K?
- Automatic keystone correctionYes · PX748-4K: No
- Power consumption297 W vs 310 W+4%
Why is PX748-4K better than TH685i?
- Resolution (on screen)1920 × 1080 (Full HD) vs 3840 × 2160 (4K UHD)
- Built-in speakers (total output)5 W vs 10 W2×
- Brightness (ANSI / ISO lumens)3,500 lm vs 4,000 lm+14%
- HDMI inputs1 vs 22×
- Fan noise35 dB vs 32 dB+9%
- Optical zoom1.3× vs 2×+54%
Specifications
Side by side
| Picture | ||
| Resolution (on screen) | 1920 × 1080 (Full HD) | 3840 × 2160 (4K UHD) |
| Native panel resolution | 1920 × 1080 (Full HD) | 1920 × 1080 (Full HD) |
| 4K method | — | 4K by pixel shifting |
| Display technology | DLP | DLP |
| Light source | Lamp | — |
| Brightness (ANSI / ISO lumens) | 3,500 lm | 4,000 lm |
| Native contrast ratio | 10,000:1 | — |
| Contrast ratio (dynamic / claimed) | — | 12,000:1 |
| HDR support | Yes | Yes |
| HDR formats | HLG | — |
| Colour gamut (Rec.709) | 95% | — |
| 3D playback | Yes | — |
| Gaming | ||
| Input lag | 8.3 ms | — |
| Maximum refresh rate | — | 240 Hz |
| Game / low-latency mode | — | Yes |
| Lens & placement | ||
| Throw ratio | 1.13:1 | 1.13:1 |
| Throw ratio (zoomed in) | 1.46:1 | 1.47:1 |
| Throw type | Standard throw (1.0:1 and longer) | Standard throw (1.0:1 and longer) |
| Distance for a 100″ 16:9 image | 2.5 m | 2.5 m |
| Smallest image size | — | 30″ |
| Largest image size | — | 300″ |
| Optical zoom | 1.3× | 2× |
| Lens shift | None | None |
| Autofocus | No | — |
| Keystone correction | Yes | Yes |
| Automatic keystone correction | Yes | No |
| Sound | ||
| Built-in speakers (total output) | 5 W | 10 W |
| Smart & streaming | ||
| Smart platform | Android TV | — |
| Built-in smart platform | Yes | — |
| Chromecast built-in | Yes | — |
| Connectivity | ||
| HDMI inputs | 1 | 2 |
| HDMI version | 2 | — |
| USB port | Yes | Yes |
| Ethernet (LAN) | No | No |
| VGA input | Yes | No |
| Audio output | Yes | Yes |
| Battery, power & lifetime | ||
| Power consumption | 297 W | 310 W |
| Light source life | 4,000 h | 4,000 h |
| Light source life (eco mode) | 10,000 h | 20,000 h |
| Design & noise | ||
| Fan noise | 35 dB | 32 dB |
| Fan noise (eco mode) | — | 27 dB |
| Weight | 2.8 kg | 2.8 kg |
| Width | 312 mm | 312 mm |
| Height | 110 mm | 108 mm |
| Depth | 225 mm | 222 mm |
| Colours | White | White |
