What the Numbers on Your TV's Spec Sheet Actually Mean

Resolution: pixels are only part of the story

Resolution is the count of individual pixels on the screen, written as width by height. A 4K display has approximately 3,840 by 2,160 pixels, which is four times the count of a 1080p screen. More pixels allow finer detail, but the actual benefit depends on screen size and how far you sit from the TV.

At a typical couch distance of eight to ten feet, a 55-inch 4K screen and a 55-inch 1080p screen look nearly identical unless you are watching 4K source material. Streaming services compress video heavily, and a lot of cable and broadcast content still transmits at 1080i or 720p. The panel's image processing, which handles upscaling lower-resolution content to fill 4K pixels, often has more impact on daily picture quality than resolution alone.

See the full electronics glossary for definitions of other display terms that appear on spec sheets.

Refresh rate and what the marketed numbers hide

Refresh rate is how many times per second the screen redraws the image, measured in hertz (Hz). A 60Hz panel refreshes 60 times per second; a 120Hz panel refreshes 120 times. The difference is visible during fast-moving content: sports, action sequences, and gaming show less motion blur on a 120Hz panel.

The problem is that manufacturers routinely advertise rates of 240Hz, 480Hz, or higher using names like Motion Rate, Clear Motion, or TruMotion. These figures describe a processing effect called motion interpolation, which inserts artificially generated frames between real ones to create a smoother look. Many viewers find this effect unnatural on film content, a phenomenon sometimes called the soap opera effect. The native panel refresh rate is the number that reflects actual hardware.

When comparing TVs in a store, fast-moving content like a sports broadcast will reveal motion handling differences more clearly than a static image or a slow pan.

Brightness, nits, and HDR formats

Brightness is measured in nits. The higher the nit count, the brighter the screen can get, which matters most in two situations: watching in a very bright room and watching HDR (High Dynamic Range) content.

HDR content is mastered at specific brightness levels, and a TV that cannot reach those levels will not display the full intended contrast between the darkest shadows and the brightest highlights. A TV with 400 to 600 sustained nits handles most HDR content reasonably well. Very high-end HDR material is mastered at 1,000 to 4,000 nits, though few consumer TVs sustain those levels across the whole screen.

HDR is also a format family, not a single standard. HDR10 is the baseline open format found on nearly every compatible TV. Dolby Vision adds scene-by-scene metadata adjustments and generally requires a license fee, so it appears on mid-range and above models. HDR10+ works similarly to Dolby Vision but is used by a smaller group of content providers. A TV that supports only HDR10 will still play Dolby Vision content, but it will fall back to the HDR10 layer, which may look slightly less precise.

Color gamut and why percentages can mislead

Color gamut describes the range of colors a display can produce. Spec sheets typically express this as a percentage of a named color space, such as sRGB, DCI-P3, or Rec. 2020. DCI-P3 is the standard for cinema and most streaming HDR content, so that percentage is the most practical one to pay attention to.

A TV covering 90% of DCI-P3 produces noticeably richer, more saturated colors than one covering 72%. However, the benefit only appears when the source content is color graded to take advantage of the wider range. Standard dynamic range TV shows and older movies are delivered in sRGB or the older Rec. 709 standard, which is narrower. For those, a wide color gamut TV simply maps the content to the display's range without producing extra color.

Manufacturers sometimes advertise color using less recognized or internally defined color spaces. When comparing gamut specs, confirm that both percentages refer to the same color space.

Contrast ratio and the spec that is hardest to compare

Contrast ratio is the difference between the brightest white and the darkest black a TV can display. A higher ratio means the picture looks more three-dimensional and detail in dark scenes is more visible.

The challenge is that there is no industry-wide standard for how manufacturers measure this. Some report native contrast, measured with the backlight in a fixed state. Others report dynamic contrast, which is measured by dimming the backlight for dark scenes and brightening it for bright ones. Dynamic contrast numbers can reach 1,000,000:1 or higher, which sounds impressive but rarely reflects what you see on screen during normal content.

OLED panels produce true black by turning off individual pixels entirely, which produces a theoretically infinite contrast ratio. LED/LCD panels use a backlight that can never be fully extinguished, so they rely on local dimming zones to approximate deep black. The number of dimming zones directly affects how well an LCD TV handles dark scenes with bright elements, but this figure is often omitted from spec sheets entirely.

For a broader look at how streaming hardware connects to your TV, see how streaming sticks, smart TVs, and set-top boxes differ.