BenQ TH685P Projector
- In UK stock, ships from the UK
- UK manufacturer warranty
- UK-based engineers
- No import duty or customs charges
- GBP pricing, UK VAT invoices
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Description
The BenQ TH685P pairs Full HD DLP imaging with 3,500 ANSI lumens of brightness, giving a bright, high-contrast picture that holds up in daylight-lit living rooms. Projector-optimised HDR10 and HLG support let it downscale 4K HDR Blu-ray and streaming sources for richer contrast and colour on a big screen. Gaming is a strong focus: input lag drops as low as 8.3ms at 1080p/120Hz and 4.2ms at 240Hz, giving fast-paced titles the responsiveness they need. Dual HDMI inputs, 1.3x zoom and auto vertical keystone correction make it easy to connect consoles, streaming boxes and a laptop simultaneously and get an aligned image quickly. A lamp light source rated up to 15,000 hours in LampSave mode, a 5W built-in speaker and support for 3D content round out a versatile all-purpose projector for family movie nights and competitive gaming alike.
Key features
Bright DLP image quality suitable for daylight and ambient-light rooms.
As fast as 4.2ms at 1080p/240Hz for competitive, responsive gaming.
Downscales 4K HDR content from Blu-ray and streaming for richer contrast and colour.
Dual HDMI inputs plus 1.3x zoom and auto keystone for quick multi-device setup.
Technical specifications
Throw distance guide
With its 1.127–1.46:1 throw ratio, here's how far the projector needs to sit from the screen for common 16:9 image sizes. Try our throw distance calculator for your exact room.
| Image size | Image dimensions | Lens distance range |
|---|---|---|
| 60" | 1.33 m × 0.75 m | 1.5 m – 1.9 m |
| 80" | 1.77 m × 1.00 m | 2.0 m – 2.6 m |
| 100" | 2.21 m × 1.25 m | 2.5 m – 3.2 m |
| 120" | 2.66 m × 1.49 m | 3.0 m – 3.9 m |
| 150" | 3.32 m × 1.87 m | 3.7 m – 4.8 m |
Planning from a real wall? Use the projector room planner to upload a photo, preview the image to scale and find projectors that fit within your maximum available space.
Distances are lens-to-screen, calculated from the manufacturer's stated throw ratio; allow for lens shift and mounting hardware. Always confirm against the manufacturer's installation guide before fixing mounts.
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Choose a picture size, then upload a wall photo—or scan the QR code and take it on your phone. We'll show the projected picture at its real size.
Documents
Frequently asked questions
How bright is the TH685P and what's it best suited to?
It delivers 3,500 ANSI lumens at Full HD (1080p) resolution, giving a bright, high-contrast picture that holds up well in daylight-lit living rooms rather than needing full blackout.
How far from the screen should the TH685P sit?
With a 1.127-1.46 throw ratio and 1.3x zoom, for a 100-inch 16:9 screen it needs to sit roughly 2.49m to 3.23m back, with automatic vertical keystone correction (±40°) to help square up the image.
Is it suitable for gaming as well as movies?
Yes - it supports up to 240Hz with an input lag as low as 4.2ms at 1080p/240Hz, and includes a dedicated Game picture mode alongside Cinema, HDR, HLG, Sports and other presets.
Does it support HDR content?
Yes, it supports HDR10 and HLG, letting it downscale 4K HDR Blu-ray and streaming sources for richer contrast and colour on the big screen.
How long does the lamp last?
The lamp is rated for up to 15,000 hours in LampSave mode.
What warranty and delivery apply?
The TH685P comes with a 3-year (36-month) warranty. It's in stock at TopAV, so orders dispatch within 2 working days, with free UK delivery on orders over £100 (£9.95 below that).
Delivery & returns
Estimated delivery 29 Aug - 2 Sept. UK mainland delivery only — some large or made-to-order items may carry longer lead times.
Unused items in original packaging can be returned within 14 days of delivery. Faulty items are covered under manufacturer warranty.
Bought in the UK, backed in the UK
This item is in UK stock and ships to you from within the UK, so the order never crosses a customs border on its way to you.
The manufacturer warranty is honoured here in the UK. If something fails, you deal with us — not with an overseas seller in another time zone.
Our own UK-based engineers install, commission and support what we sell, and can attend site when a system needs hands on it.
Delivered within the UK mainland, so there is no import duty, customs charge or courier handling fee waiting for you on delivery.
Prices are in pounds sterling with proper UK VAT invoices, and purchase orders are accepted from approved education accounts — no currency conversion and no surprises at the door.
Payment & security
Pay securely by card. Education customers can apply for a 30-day purchase order account.
Schools, colleges, sixth forms, universities and multi-academy trusts can order on invoice — no card payment required. Purchase orders and credit terms are for education customers only.
All transactions are processed over an encrypted, secure checkout.
Need help specifying this for your space?
Ask Andrew — he knows the full catalogue and can advise on installation, mounting and compatible AV systems.