VID-03

Display Viewing Angle

ANSI/AVIXA V202.01 · ANSI/AVIXA V201.01 · ANSI/AVIXA D401.01

01 · Image

Image width

Aspect ratio

Height to bottom of image

02 · Angle limits

Maximum horizontal offsetⓘ

° from centreline

Display rated viewing angleⓘ

° total (H)

03 · Seating

Closest viewer distance

Farthest viewer distance

Worst-case lateral seat offsetⓘ

Seated eye height

Awaiting input9 fields left: Image width · Aspect ratio · Height to bottom of image · Maximum horizontal offset · Display rated viewing angle · Closest viewer distance · Farthest viewer distance · Worst-case lateral seat offset · Seated eye height

Drawing

The drawing appears when the inputs are complete

01
Map the usable seating zone from the DISCAS maximum horizontal offset and the display’s own off-axis performance, and check vertical comfort at the front row.
02
Tip. A panel rated 178° off-axis does not give a 178° viewing zone. That figure is the angle at which contrast has fallen to a defined fraction, not the angle at which content is still worth watching — the DISCAS ±45° usually binds first, and this tool takes whichever is tighter.
03
±45° — DISCAS horizontal limit
04
30° — Vertical comfort ceiling
05
178° — Typical panel off-axis spec

Industry viewing angle standards

Two different angles govern a seating layout, and both must be satisfied. The horizontal angle subtended by the image at the viewer decides how immersive and legible the picture is; the off-axis angle from the screen centreline decides whether the panel still holds its contrast and colour at that seat.

Subtended horizontal angle

How wide the image appears from a given seat. Too narrow and detail is lost; the recognised thresholds come from cinema and broadcast practice rather than from AVIXA.

Use cases

≥ 36° — THX reference, cinema and immersive
≥ 30° — SMPTE EG-18, professional and detailed work
≥ 26° — THX minimum, general presentation
≥ 20° — basic viewing, video and digital signage

Formula

Angle = 2 × arctan(image width ÷ (2 × viewing distance))

SMPTE EG-18 · THX

Off-axis position

How far a seat sits from the screen centreline. DISCAS caps the usable horizontal offset; the display’s own off-axis rating caps it again, and the tighter of the two governs.

Use cases

DISCAS maximum horizontal offset — typically ±45°
Panel off-axis rating — often quoted as 178°
Vertical comfort ceiling — 30° above eye line
The tighter limit defines the usable seating zone

Formula

Usable half-width = distance × tan(governing half-angle)

ANSI/AVIXA V202.01

A panel’s quoted off-axis figure is the angle at which contrast has fallen to a defined fraction of its on-axis value — not the angle at which content is still worth watching. Treat it as an outer bound, never as the design target.