Reading in Multimodal Environments: Assessing Legibility and Accessibility of Typography for Television
Penelope Allen, Judith Garman, Ian Calvert, Jane Murison · 2011 · The Proceedings of the 13th International ACM SIGACCESS Conference on Computers and Accessibility (ASSETS) · doi:10.1145/2049536.2049604
Summary
This demonstration paper from BBC Research & Development explores the legibility and accessibility of typography on television, an area that had received surprisingly little research attention despite the increasing complexity of text-based content on TV. Modern television presents text far beyond traditional subtitles and teletext — including navigation menus, ticker bars, tabulated results, infographics, and interactive service overlays. The researchers built a customisation prototype that allowed users to adjust typographic settings (font type, size, letter spacing, text colour, background colour, opacity, brightness) while viewing text in different multimodal contexts on an actual television screen. User testing included participants with cognitive and sensory access needs, older users, and users with no stated access needs, providing a broad view of typographic preferences across diverse audiences.
Key findings
The first study revealed that participants across all groups preferred a larger font size than the current television standard, with this preference becoming particularly strong when text appeared alongside other content elements demanding attentional focus — such as video playing simultaneously with overlaid text. The font Helvetica Neue was especially favoured by participants with access needs, suggesting that clean sans-serif typefaces aid legibility on screen. The research references earlier work by the Royal National Institute of the Blind (RNIB) which developed the Tiresias font in 1998 specifically for TV subtitling, chosen for its clarity and reading ease, and which recommended a minimum font size of 24pt for television use. The prototype demonstrated that customisable font settings could yield a 75% enhancement in legibility when users tailored typography to their needs, echoing findings from prior print-based research. A second study was planned to further investigate optimal font sizes across different interactive TV environments.
Relevance
This research is highly relevant as television continues to evolve into an increasingly text-rich, interactive medium with streaming services, smart TVs, and second-screen experiences. The finding that users — particularly those with access needs — require larger text than industry standards provide has direct implications for broadcast guidelines and interactive TV design. For accessibility practitioners working on media platforms, the study reinforces that typographic choices made for desktop or print contexts do not transfer directly to the television viewing environment, where viewing distances, screen sizes, and competing visual content create distinct legibility challenges. The customisation approach also demonstrates the value of allowing users to personalise their viewing experience rather than relying on one-size-fits-all typography standards.
Tags: typography · readability · multimedia accessibility · low vision · cognitive accessibility · aging · television accessibility · visual design