Video

Display designer

Size, brightness, and viewing angle — pick the right screen for the room.

Three calculations in one tool. Size: DISCAS image-height rule (4× passive, 6× basic decision making, 8× analytical) for the farthest viewer, plus THX 36°/40° presets. Brightness: required nits from ambient lux, screen reflectance and target contrast ratio (7:1 to 80:1). Viewing angle: the cone where flat-panel colour holds together.

inputs

Distance unit

Farthest viewer distanceft

Screen to the back row. The image-height rules are set by the farthest viewer, not the average.

Display aspect ratio

Basic decision making (6× height)

6.80ft diagonal

82" diagonal · 5.93 × 3.33 ft (w × h)

DISCAS BDM — reading slides, spreadsheets, video calls. The default for meeting rooms.

Analytical decision making (8× height)

5.10ft diagonal

61" diagonal · 4.44 × 2.50 ft (w × h)

DISCAS ADM — CAD, medical imaging, fine text. Farthest viewer no more than 8 image heights away.

Passive viewing (4× height)

10.20ft diagonal

122" diagonal · 8.89 × 5.00 ft (w × h)

General video, digital signage, presentations without fine detail.

cinema presets (field of view)

▸ THX recommended 36° wide: 14.91 ft (179")
▸ THX maximum 40° wide: 16.70 ft (200")