Horizontal scan rate is the number of horizontal line cycles a video signal or display repeats each second, usually expressed in kilohertz (kHz). On a CRT, each cycle includes the beam sweeping across a line and returning for the next one. It is a different measurement from vertical refresh or frame rate.
What horizontal scan rate measures
Horizontal scan rate is a frequency: it counts how often the signal completes a horizontal line cycle each second. A rate of 15.75 kHz, for example, means 15,750 cycles per second—not 15,750 visible picture lines. A cycle includes timing for blanking and retrace, so the frequency alone does not reveal how many lines of the picture are visible. Extron’s technical explanation describes the number of lines drawn each second as the horizontal scan rate; the BICSI AV design reference likewise defines it as a frequency measured in kHz.
As an Amazon Associate I earn from qualifying purchases.
How the term applies to a CRT
In a cathode-ray tube (CRT), an electron beam sweeps horizontally across the screen to draw a line, then returns to begin the next line. The repeated sweep-and-return timing is the horizontal cycle. This physical beam movement is specific to CRTs.
Quick wins for a faster PC:
Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →How it differs from vertical scan rate
Horizontal scan rate counts line cycles per second; vertical scan rate describes how often a field or frame is completed. These figures are related by the video timing, but they are not interchangeable. In interlaced video, two fields—each containing a pass of lines—combine to form one frame, so field rate and frame rate can differ. BICSI’s AV reference discusses this distinction in its treatment of interlaced formats.
#1 Best Overall
- CRISP CLARITY: This 23.8″ Philips V line monitor delivers crisp Full HD 1920x1080 visuals. Enjoy movies, shows and videos with remarkable detail
- INCREDIBLE CONTRAST: The VA panel produces brighter whites and deeper blacks. You get true-to-life images and more gradients with 16.7 million colors
- THE PERFECT VIEW: The 178/178 degree extra wide viewing angle prevents the shifting of colors when viewed from an offset angle, so you always get consistent colors
- WORK SEAMLESSLY: This sleek monitor is virtually bezel-free on three sides, so the screen looks even bigger for the viewer. This minimalistic design also allows for seamless multi-monitor setups that enhance your workflow and boost productivity
- A BETTER READING EXPERIENCE: For busy office workers, EasyRead mode provides a more paper-like experience for when viewing lengthy documents
- Horizontal scan rate: line-cycle frequency, typically stated in kHz.
- Field rate: the number of interlaced line passes per second, stated in Hz.
- Frame rate: the number of complete pictures per second, stated in Hz.
Historical standard-definition examples
A 2006 BICSI/InfoComm International AV design reference gives these figures for historical standard-definition systems. They describe signal formats, not universal specifications for modern displays.
| Signal system | Horizontal frequency | Interlaced timing in the reference |
|---|---|---|
| NTSC | 15.75 kHz | 60 fields per second; 262.5 scan lines per field; 525 per frame |
| PAL and SECAM | 15.625 kHz | 50 fields per second; 312.5 scan lines per field; 625 per frame |
The line totals include the signal’s scanning structure; they should not be read as counts of active visible picture lines. The cited reference is a 2006 edition, and these figures are included as format examples rather than current product limits.
Rank #2
- CRISP CLARITY: This 22 inch class (21.5″ viewable) Philips V line monitor delivers crisp Full HD 1920x1080 visuals. Enjoy movies, shows and videos with remarkable detail
- 100HZ FAST REFRESH RATE: 100Hz brings your favorite movies and video games to life. Stream, binge, and play effortlessly
- SMOOTH ACTION WITH ADAPTIVE-SYNC: Adaptive-Sync technology ensures fluid action sequences and rapid response time. Every frame will be rendered smoothly with crystal clarity and without stutter
- INCREDIBLE CONTRAST: The VA panel produces brighter whites and deeper blacks. You get true-to-life images and more gradients with 16.7 million colors
- THE PERFECT VIEW: The 178/178 degree extra wide viewing angle prevents the shifting of colors when viewed from an offset angle, so you always get consistent colors
Why the term appears in non-CRT display specifications
Horizontal scan rate remains useful when discussing whether a display can accept a signal, even when the device has no CRT beam. Extron notes that computer-to-video conversion changes the computer’s horizontal scan rate to match a television format, and that presentation devices such as LCD or DLP projectors must support the input signal’s timing. For these displays, the term concerns signal compatibility, not an internal electron-beam sweep.
Free tools Windows power users keep installed
One-click scans. No signup required.
Quick Recap
Best Value
- 【INTEGRATED SPEAKERS】Whether you're at work or in the midst of an intense gaming session, our built-in speakers provide rich and seamless audio, all while keeping your desk clutter-free.
- 【EASY ON THE EYES】 Protect your eyes and enhance your comfort with Blue-Light Shift technology. This feature reduces harmful blue light emissions from your screen, helping to alleviate eye strain during long hours of use and promoting healthier viewing habits.
- 【WIDEN YOUR PERSPECTIVE】Our sleek minimal bezel design ensures undivided attention. The nearly bezel-free display seamlessly connects in a dual monitor arrangement, delivering an unobstructed view that lets you focus on more at once, completely distraction-free.
Rank #4
- CURVED FOR ENHANCED ENGAGEMENT: An immersive viewing experience with a curved monitor that wraps more closely around your field of vision; It creates a wider view, enhancing depth perception and minimizing peripheral distraction
- SMOOTH PERFORMANCE FOR SEAMLESS CONTENT: Stay in the action when playing games, watching videos, or working on creative projects; The 100Hz refresh rate reduces lag and motion blur so you don't miss a thing in fast-paced moments¹
- MORE GAMING POWER: Gain the edge with optimizable game settings; Color and image contrast can be adjusted to see scenes more vividly and spot enemies hiding in the dark; Game Mode adjusts any game to fill the screen so you can view every detail²
- KEEP IT EASY ON THE EYES: Care for your eyes and stay comfortable, even during long sessions; Advanced eye comfort technology certified by TÜV reduces eye strain by minimizing blue light and reducing irritating screen flicker²
- INCREASED VERSATILITY: Connect to more; Plug devices straight into your monitor for increased flexibility, making your computing environment even more convenient
Rank #3
- Clear visuals. Fluid motion: A 144Hz refresh rate and 1ms MPRT deliver smooth, tear‑free motion across work, gaming, and streaming for clearer, more fluid viewing.
- Eye comfort: TÜV Rheinland 3‑star* certification reduces harmful blue light while preserving stunning color quality without compromise. *TÜV Rheinland 3-star eye comfort certification.
- Wide viewing angle: Get consistent views across a wide 178° /178° viewing angle.
- In-Plane Switching (IPS): See excellent color accuracy and consistency across wide viewing angles with In-plane Switching (IPS) technology.
- Ultra-thin bezels: Maximize your viewing experience with thin bezels.
What to check when reading a specification
- Check horizontal frequency in kHz separately from vertical field or frame rate in Hz.
- Confirm whether the signal is progressive or interlaced; a field rate is not automatically the same as a frame rate.
- Distinguish total scan lines from active visible lines.
- For compatibility, verify that the display accepts the complete signal timing rather than relying on horizontal frequency alone.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
