Interactive Display Board Product

Overview

An interactive display board (interactive flat panel, IFP) replaces the projector-and-whiteboard combination in classrooms and meeting rooms with a single wall-mounted device: a large 4K LCD television panel with a multi-touch layer over the glass and an embedded computer behind it. Users write on the screen with a finger or Passive Stylus Pen, cast laptop and phone screens wirelessly, and run conferencing software directly on the panel. Typical diagonal sizes are 65, 75, and 86 inches, with the 75-inch class dominating classroom installations.

The device is built around four layers: the Display Module that forms the image, the Touch System system that senses input, the Compute Module module that runs the software, and the Enclosure and Wall Mount Kit that hold a 35–65 kg panel safely on a wall.

Display module

The image comes from a standard large-format LCD open cell — the same LCD Panel class used in commercial signage — lit by an LED Backlight Unit of white LED strips behind diffuser films. Brightness is 350–450 cd/m², roughly double a home TV, because classrooms are lit and the panel competes with windows. An Timing Controller Board timing controller converts the video stream into row/column drive signals, and the Backlight Driver Board regulates LED current with PWM dimming.

The outermost layer is the Tempered Cover Glass: 4 mm of anti-glare tempered glass bonded over the cell. The etched anti-glare surface scatters reflections and gives the pen tip a slight drag that feels closer to a marker on a board. Hardness around Mohs 7 lets the glass survive years of pen taps and the occasional ring or key.

Touch sensing

Most IFPs use an infrared grid. The IR Emitter Array — rows of 850 nm IR LEDs hidden in two edges of the bezel — fire beams across the glass surface to the IR Receiver Array on the opposite edges. A finger or pen touching the glass blocks a set of horizontal and vertical beams; the Touch Controller PCB board scans the arrays at over 100 Hz, reconstructs touch positions from the shadow pattern, and reports them to the active computer as a standard USB-HID multi-touch device. IR frames distinguish a fine pen tip from a finger by blocked-beam diameter, which lets software assign ink to the pen and erase to the palm.

Premium models instead bond a projected-capacitive Touch Digitizer to the glass, the same technology as a tablet, which gives lower hover height and better rejection of sleeves and water but costs more at this size. Either way the panel supports 20–40 simultaneous touch points so several students can write at once.

Compute and I/O

The built-in computer is an ARM Compute SoC Module (quad- or octa-core, 4–8 GB RAM) on the Android Carrier Board, booting Android from eMMC Storage flash. It runs the whiteboarding app, screen-share receivers (Miracast, AirPlay, Google Cast) over the Wi-Fi/Bluetooth Module module, and a browser. For organizations that need Windows, the OPS Module Slot accepts an Intel OPS module — a slide-in PC measuring 180 × 119 × 30 mm that draws power and exchanges HDMI and USB through a single 80-pin connector, so the PC can be swapped without tools.

External sources connect through the I/O Board board: HDMI 2.0 inputs handled by the HDMI Receiver IC, a USB-C port that carries video, data, and 65–100 W laptop charging on one cable, and front USB-A ports. The USB Switching Hub performs "touch follow": it routes the touch controller's USB stream to whichever source is on screen, so touching the panel controls the laptop when the laptop is displayed.

Audio, power, and mounting

Conferencing drove audio upward: panels carry two 15–20 W Speaker drivers behind the lower bezel, powered by the Class-D Audio Amplifier Class-D board, plus an Microphone Array of 4–8 MEMS microphones whose beamforming DSP picks up voices 6–8 m into the room.

The internal Power Supply converts mains into the 12, 18, and 24 V rails for the backlight, logic, OPS slot, and audio; total draw runs 150–400 W with the backlight at full brightness. A fused Mains Inlet Module with line filter and a Thermal Fuse protect the supply.

Mechanically, the Front Bezel Frame clamps the glass and hides the IR arrays while the Rear Cover Pan closes the chassis and carries the VESA 800×400 boss pattern. The Wall Mount Kit kit hangs the panel from a Wall Mounting Plate lagged into studs or masonry; hooked Panel Hanging Rails on the panel drop over the plate and lock with safety screws so the panel cannot be lifted off accidentally — a load case standards treat seriously, since the largest models approach the weight of an adult.