Three display technologies cover almost every commercial deployment. Choosing between them — and reading their spec sheets honestly — is most of the hardware decision.
Commercial display work comes down to three panel families. LCD (with LED backlighting — the marketing term "LED TV" still means an LCD panel) is the workhorse: cost-effective, available in every size up to large formats, bright enough for most indoor settings, and the default for menu boards, wayfinding, corporate and retail screens. Direct-view LED — where the LEDs are the image, not a backlight — is the technology for very large surfaces, high brightness and video walls without bezels, at a higher cost and coarser close-up resolution. OLED, where each pixel emits its own light, offers the deepest blacks and thinnest, sometimes flexible form factors, but commands a premium and carries a real risk of burn-in from static content, which makes it a poor fit for the fixed logos and layouts typical of commercial signage. Most deployments are LCD; the reason to leave it is a specific need for scale (LED) or a showcase aesthetic (OLED) that justifies the cost and caveats.
| LCD (LED-backlit) | Cost-effective, all sizes, good indoor brightness. Default for most signage. Limited at very large scale and in bright sun. |
|---|---|
| Direct-view LED | Very large surfaces, high brightness, no bezels. Higher cost, coarser at close range. For video walls and big formats. |
| OLED | Deepest blacks, thin/flexible. Premium price and burn-in risk with static content — usually wrong for fixed signage layouts. |
Brightness, measured in nits (candela per square metre), is the specification most often underestimated and most responsible for disappointing installations. A screen comfortable in a dim room — a few hundred nits — washes out completely behind a shop window or near large glazing, where you need high-brightness commercial panels of a thousand-plus nits, and window-facing displays may need several times that to stay legible against daylight behind and beside them. The mistake is buying for the brightness of the showroom rather than the brightness of the destination. Before any panel is chosen, the honest question is how much ambient light the screen will actually fight, all day, in its real position — and that single answer eliminates more wrong products than any other.
Resolution only means anything in relation to size and viewing distance. "4K" on a small display viewed from across a room is invisible resolution you paid for; the same 4K on a large display people stand near is genuinely sharper. Judge resolution as pixel density at the real viewing distance, not as a headline. Contrast ratio is worth attention for image depth but is quoted on incompatible bases between manufacturers, so it compares poorly across brands and should be sanity-checked by eye, not trusted as a number. Refresh rate, a battleground in gaming and consumer TV, is largely irrelevant for the static and slow-moving content of most signage. Reading a spec sheet well is mostly knowing which numbers change the outcome — brightness, real resolution density, duty-cycle rating — and which are there to make one product look better than another on paper.
REF·02 — Mounting & environment →