Before you start: the source rule
Every route in this guide makes the device connected to the TV touchable — a PC, an Android box, a media player. No overlay can reach inside a television's own smart-TV software. So step zero is deciding what will drive the screen: Windows for whiteboard and kiosk software, Android for app-based teaching, a signage player for interactive catalogues. Decide that first; the frame is the easy part.
Route 1 — Infrared overlay frame (the standard answer)
- Measure the cabinet, not the brochure: overall width, height, and bezel flatness. The frame is built to these numbers.
- Order the frame for your diagonal and cabinet — 20 touch points is the standard build above 43 inches; see the TV overlay product page for the specification pattern.
- Mount the frame on the bezel (brackets or the profile's fixing points), route the USB lead to the source device.
- Connect and calibrate: the source sees a USB HID touch device; run the supplied calibration for corner accuracy.
- Set the software to a touch-first UI: large targets, no hover-dependent menus.
Route 2 — Touch foil behind glass
If the television sits behind a protective glass pane — a storefront, a framed installation — a capacitive touch foil laminated on that glass can sense through it. This route is elegant and permanent; the foil stays with the glass, not with the TV. Read the foil vs frame comparison before committing, because the permanence cuts both ways.
Route 3 — Replace the set with an interactive panel
If the television is due for replacement anyway, price an interactive flat panel in the same size before ordering a retrofit. Panels win on brightness, warranty simplicity and zero alignment; overlays win whenever the existing set has years of life left — which, in most classrooms we hear from, it does.
Costs and time, honestly framed
The overlay route costs the frame plus under an hour of installation labour per room; the panel route costs a display plus disposal of the old one. For a school converting ten rooms, the overlay programme typically funds all ten rooms for the panel programme's cost of three — with the remaining budget better spent on the source devices and software. The DIY depth is real but modest: our DIY infrared touch screen article documents a full build, mistakes included.
The checklist version
- Source device chosen and its OS confirmed for your software
- Cabinet width × height measured; bezel landing zone photographed
- Frame ordered against the drawing, not the diagonal
- USB routing planned (frame to source, no hubs in between for first power-up)
- Calibration run, edges tested, touch UI font sizes increased