Buying a commercial display usually starts with the wrong question. Most people ask "how big can I go?" when the question that actually matters is "how far away will people be standing?" Get that backwards and you end up with one of two costly problems: a screen so small that customers squint and miss the message, or a panel so large it overwhelms a tight lobby and inflates the budget for no real benefit. Screen size is the first decision you make and the hardest one to undo once a display is on the wall. This guide lays out a simple, repeatable way to choose the right size, based on viewing distance, the job the screen needs to do, and the room it lives in. We will cover the sizes that suit common applications, the specs that matter once you have narrowed it down, and the exact Samsung and LG models available at each size.
Start With Viewing Distance, Not Screen Size
The most useful number in display sizing is not the screen diagonal. It is how far your audience sits or stands from the screen. A display that looks enormous in an empty showroom can be unreadable from across a busy lobby, and a screen that fills a wall in a product photo may be far larger than a 12-foot drive-thru lane needs.
A practical rule of thumb: the farthest a typical viewer can comfortably read mixed signage content (a blend of images and normal-sized text) is roughly the screen's diagonal in inches, converted to feet and divided by 2.5. A 55-inch display stays legible out to about 22 feet; a 75-inch panel reaches roughly 30 feet. Get closer than about one-eighth of the diagonal in feet and a large screen starts to feel overwhelming, because you cannot take in the whole picture at once. The table below turns that into quick guidance.
| Screen size | Comfortable minimum distance | Maximum legible distance |
|---|---|---|
| 32" | ~4 ft | ~13 ft |
| 43" | ~5 ft | ~17 ft |
| 55" | ~7 ft | ~22 ft |
| 65" | ~8 ft | ~26 ft |
| 75" | ~9 ft | ~30 ft |
| 85" | ~11 ft | ~34 ft |
| 98" | ~12 ft | ~39 ft |
Two things shift these numbers. Bold, headline-only content, like a single promo line or a price, reads from noticeably farther than the table suggests, while dense layouts with small text need viewers closer. And because every panel in this guide is 4K, people can stand near a large screen without seeing individual pixels, so you rarely need to worry about anyone being "too close."
Match the Size to the Job
Once you know your viewing distances, the application usually points straight to a size range.
- Menu boards (QSR, cafes, car washes): Most counters put customers 6 to 12 feet away, which makes 43 to 55 inches the sweet spot for a single-panel menu. Multi-panel menus often run two or three 49 to 55-inch screens side by side.
- Lobbies and reception: Viewers approach from across the room, so 55 to 75 inches gives presence without crowding. A welcome screen read from 20 feet or more wants 65 inches and up.
- Retail and window displays: Storefront glass is read from the sidewalk, often 15 to 25 feet out, so 55 to 75 inches in a high-brightness, sunlight-readable panel earns its keep.
- Wayfinding and directories: People stand close and read detailed text, so 43 to 55 inches works well, frequently mounted in portrait orientation.
- Meeting and huddle rooms: Size to the back of the table. A small huddle room is happy with 55 inches; a mid-size conference room wants 75 to 85 inches.
- Video walls and large venues: When one screen cannot cover the distance, multiple panels tile together, or you step up to 85 and 98-inch displays for auditoriums, large lobbies, and big-box retail.
A Size-by-Size Breakdown (32" to 98")
32 and 43 inches are your close-range workhorses: shelf-edge screens, wayfinding kiosks, drive-thru confirmation displays, and compact menu panels. The Samsung QMC and QET both start at 32 inches, the smallest in the commercial lineup.
55 inches is the most popular single size in digital signage, and for good reason. It is large enough for lobbies and menus yet light enough for straightforward mounting, and it is the standard building block for tiled video walls.
65 and 75 inches dominate lobbies, larger menus, and conference rooms where you need to be seen from across the room. Nearly every series here, including the Samsung QBC, QBR, QHC, and QMC plus the LG UM5J and UH5J, offers both sizes.
85 inches and up is about impact: large lobbies, auditoriums, and showrooms. The Samsung QBR and QET reach 85 inches, the LG UM5J goes to 86 inches, and the Samsung QMC tops out at a wall-filling 98 inches.
The Specs That Matter Once You've Picked a Size
Size narrows the field, but three specs decide whether a display actually survives its environment.
Brightness (measured in nits) has to match the ambient light. A 250-nit panel like the Samsung QBC is fine for a controlled indoor lobby, but a sunlit storefront window needs far more, such as the 700 nits of a Samsung QHC or QHR, or a dedicated high-brightness window display. For spaces with some ambient light, the 300-nit Samsung QET and LG UM5J cope well, while 500-nit panels like the Samsung QMC and LG UH5J give you more headroom.
Rated operating hours matter more than most buyers expect. A consumer TV is not built to run all day. Panels rated 16/7, including the Samsung QBC, QBR, and QET and the LG UM5J, are designed for up to 16 hours a day, which is fine for a shop that closes at night. Screens that run around the clock, like those in airports, hospitals, and 24-hour gyms, need a 24/7-rated display such as the Samsung QHC, Samsung QMC, or LG UH5J.
Resolution is the easy part at these sizes: every model in this guide is 4K, so even an 85 or 98-inch screen stays sharp from a few feet away. The bigger the panel, the more that 4K resolution pays off, because viewers tend to stand closer to large displays.
Available Sizes by Model
Here is how the most popular commercial series compare on size range and the specs that ride along with it.
| Model | Available sizes | Brightness | Rated hours | Resolution | Platform |
|---|---|---|---|---|---|
| Samsung QBC | 43–75" | 250 nits | 16/7 | 4K | Tizen |
| Samsung QBR | 43–85" | 250 nits | 16/7 | 4K | Tizen (latest) |
| Samsung QHC | 43–75" | 700 nits | 24/7 | 4K | Tizen |
| Samsung QHR | 43–75" | 700 nits | 24/7 | 4K | Tizen (latest) |
| Samsung QMC | 32–98" | 500 nits | 24/7 | 4K | Tizen |
| Samsung QET | 32–85" | 300 nits | 16/7 | 4K | Tizen |
| LG UM5J | 43–86" | 300 nits | 16/7 | 4K | webOS (IP5x) |
| LG UH5J | 43–75" | 500 nits | 24/7 | 4K | webOS (IP5x) |
If you want the widest size flexibility from a single series, the Samsung QMC spans 32 to 98 inches and covers almost every scenario on its own. For standard indoor signage on a tighter budget, the Samsung QBC and LG UM5J are the value picks, while the QHC and QHR step up to 700 nits for bright rooms and storefronts. Browse the full Samsung QBC series, the Samsung QMC series, or the LG commercial display lineup to compare sizes side by side.
Frequently Asked Questions
What size display do I need for a menu board?
For a single-screen menu where customers order 6 to 12 feet from the counter, 43 to 55 inches is ideal. Mount it in landscape for wide menus or portrait for tall, category-style boards. If you are running several menu panels in a row, 49 to 55-inch screens tile cleanly. Keep the text large; a good guideline is about one inch of letter height for every 10 feet of viewing distance, so prices and item names read clearly from the back of the line.
How far away can people read my screen?
As a rule of thumb, take the screen's diagonal in inches and divide by 2.5 to get the maximum comfortable reading distance in feet for detailed content. A 55-inch display works to about 22 feet; a 75-inch reaches roughly 30 feet. Bold, simple messages read from farther, while dense text needs viewers closer.
Is a 75-inch display too big for a small room?
It can be. In a room where viewers sit within about 8 feet, a 75-inch screen makes them turn their heads to take in the whole picture, and small text can feel uncomfortable. For tight huddle rooms and compact lobbies, 55 to 65 inches is usually the better call. Save 75 inches and up for spaces where the back row sits 9 feet or more from the screen.
Should I use one large display or several smaller ones?
It depends on the message and the space. One large screen is simpler to install and manage and makes the strongest single statement, which is best for a hero welcome message or a feature menu. Multiple screens, or a tiled video wall, let you show different content in different zones, wrap around corners, or cover viewing distances a single panel cannot. If your content is one message, go big; if it is several messages or a very wide space, go multiple.
Get the Size Right the First Time
Still weighing sizes? That is the conversation our team has every day. DisplayDetails is an authorized reseller of Samsung and LG commercial displays, so every panel ships brand-new with the full manufacturer warranty, and shipping is free. Browse the Samsung QBC series for value-priced indoor signage, the LG commercial displays for dust-resistant webOS panels, or the full Samsung lineup for every size from 32 to 98 inches. Not sure which size fits your space? Contact our team with your viewing distances and we will spec the right display for you.
