Why Diagonal Screen Size Numbers Can Be Misleading
If you have ever shopped for screens, whether for a smartphone, desktop monitor, or even glanced at gaming machines from places like MrQ Casino, you’ve probably noticed the obsession with diagonal measurements. A screen’s size is almost always given as a diagonal length in inches, but this single number can be deceptive if you don’t understand the context behind it.
In this post, we’ll unpack how mechanical constraints historically shaped cabinet and screen sizes, why the physical footprint matters more than just viewing the diagonal, and how modern devices—from video slots to your smartphone—challenge illusions created by diagonal inches and aspect ratios. We'll also drop in some surprising connections with historic design decisions that even the California Office of Historic Preservation can appreciate.
Understanding the Roots: Mechanical Constraints and Screen Size
The tale of display sizes starts long before smartphones and LED monitors. For decades, the size of display screens—especially in video slots found in casinos like MrQ Casino—was influenced less by the desire for large images and more by mechanical and ergonomic constraints.
Old-School Cabinet Design Dictated Screen Size
In early slot machines, screens weren't just glass and pixels; they were housed inside elaborate cabinets. These cabinets had to include reels, coin slots, payout sections, website and sometimes speakers. The size of the screen was limited by the space available for the rest of these components.
- The coin hopper and payout tray demanded a certain amount of depth.
- Mechanical reels required space behind or around the screen.
- User ergonomics: Players needed screens positioned at comfortable viewing angles and heights.
As a result, while the diagonal screen size might have been only about 15 or 17 inches for many video slots, the entire cabinet footprint could be several times larger. The visible screen window was just a part of the story.
Cabinet Footprint vs. Reel Window
The computer-like animations and videos slots show today might make you wonder why older machines look so bulky. This is because the cabinet footprint includes more than just the screen window. For example:
Component Approximate Space Required Purpose Screen/Reel window 15-21 inch diagonal area Display game visuals Cabinet control section Large panel below or beside screen Button panel, bill acceptor, coin slot Mechanical backing Several inches deep Houses reels, internal components
If you imagine the screen as the “window,” the cabinet is the entire room. Focusing only on diagonal screen inches hides how much room the device requires.
Video Slots Grew Bigger, Then Mobile Made Screens Smaller Again
In the evolution diagonal screen measurement of video gaming—both casino and otherwise—screen size trends show some interesting back-and-forth movement.
Why Were Video Slot Screens Increasing in Size?
When video slots shifted from mechanical reels to fully digital displays, operators and manufacturers saw the benefit of larger, more immersive screens:
- Improved visual effects could attract players’ attention from a distance on crowded casino floors.
- Larger screens allowed more creative slot themes and animations.
- Brands like those seen at MrQ Casino leveraged bigger displays to improve storytelling.
This growth mirrored what happened with computer monitors and TVs for decades—bigger was better, up to a point.
Mobile Changed the Game
Then smartphones entered the picture as the ultimate space-conscious gaming platform. They emphasized portability, and their screen sizes reflect trade-offs between display area and device size.
Though some phones tout diagonals of 6.7 inches or more, their aspect ratios have elongated, affecting how much usable screen area is available. Comparison tables often confuse buyers because diagonal size alone glosses over these nuances.
Diagonal Inches and Aspect Ratio Can Mislead
Diagonal Measurement: What It Tells You and What It Doesn't
Diagonal size numbers measure the distance from one corner of the display to the opposite corner. However, these don't indicate:
- Actual screen area, which is the total visible surface.
- Usable space for UI elements like buttons or slot controls, especially when touch interactions depend on comfortable hit targets.
- Screen shape or aspect ratio, which dramatically changes perceived size and layout.
For example, a 21-inch monitor with a 16:9 aspect ratio has far more screen area than a 21-inch 4:3 display.
Aspect Ratio Makes a Huge Difference
Aspect ratio is the relationship of width to height expressed as two numbers separated by a colon (like 16:9). Here are some common ratios and how they affect area for the same diagonal:
Aspect Ratio Example Device Type Relative Usable Width & Height 4:3 Old monitors, vintage slot screens More square, less wide 16:9 Modern monitors, HDTVs Wider, less tall 19.5:9 (approx.) Many modern smartphones Very tall and narrow screens
This means if you have two devices with the same diagonal measurement but different aspect ratios, the way you use them changes significantly. On a slot machine in a casino environment, the difference can affect how easily a player sees symbols or interacts with buttons.

Screen Area vs Diagonal: Everyday Object Comparisons
Let’s put this into perspective with some tangible comparisons:
- A typical smartphone screen of 6.7 inches diagonal is roughly the size of a large candy bar or a standard pencil lying flat.
- A desktop monitor of 24 inches diagonal measures about the width of two pencils lined end-to-end.
- Older video slot screens, measuring around 15-17 inches diagonal, are comparable in height to a sheet of letter-size paper and not much wider.
When the gaming industry talks about screen sizes, especially in marketing copy, it’s essential to remember this: diagonal measurement alone does not capture the true user experience or how much actual space a screen occupies.
Why This Matters: From Design to Accessibility
Whether designing or assessing interfaces for historic slot machines, modern gaming apps, or everyday devices, being aware of these nuances is critical.
Accessibility and Readability
For casino operators or game developers, like those at MrQ Casino, ensuring that visual elements fit comfortably within the available screen and are appropriately sized for touch is key. Confusing marketing claims around “bigger” screens that rely solely on diagonal dimensions can mislead about real usability.

Preservation and Historic Context
Organizations such as the California Office of Historic Preservation are interested in preserving gaming cabinets not only for their aesthetic but for their mechanical and ergonomic design significance. The cabinet size reflects technology and cultural habits of their era—not just the screen size.
Conclusion: Look Beyond the Diagonal
When it comes to measuring screens, the diagonal inch number is just one piece of the puzzle. Understanding:
- The physical footprint of the device (cabinet or chassis)
- The aspect ratio and how it shapes usable display area
- The real estate needed for touch targets and UI controls
will result in smarter decisions whether you’re comparing a classic slot machine display, a new casino gaming app on your smartphone, or a desktop monitor for work and play.
As fans of both technology and gaming history, we encourage you to think critically about screen size claims. Remember that a 21-inch diagonal doesn’t tell you how much you will actually see or touch comfortably—context matters.
Next time you marvel at the flashy displays on a casino floor https://enyenimp3indir.net/what-is-a-slot-machine-top-box-and-what-is-it-for/ or your pocket touchscreen, ask: are those diagonal inches telling the whole story?