CRT Monitor Resolution and Refresh Rates (VSF)

The most important aspect of a monitor is that it should give a stable display at the chosen resolution and colour palette. A screen that shimmers or flickers, particularly when most of the picture is showing white (as in Windows), can cause itchy or painful eyes, headaches and migraines. It is also important that the performance characteristics of a monitor be carefully matched with those of the graphics card driving it. It’s no good having an extremely high performance graphics accelerator, capable of ultra high resolutions at high flicker-free refresh rates, if the monitor cannot lock onto the signal.

Monitor Resolution

Resolution is the number of pixels the graphics card is describing the desktop with, expressed as a horizontal by vertical figure. Standard VGA resolution is 640×480 pixels. This was pretty much obsolete by the beginning of the new millennium, when the commonest CRT monitor resolutions were SVGA and XGA – 800×600 and 1024×768 pixels respectively.

Monitor Refresh Rate

Refresh rate, or vertical scanning frequency, is measured in Hertz (Hz) and represents the number of frames displayed on the screen per second. Too few, and the eye will notice the intervals in between and perceive a flickering display. It is generally accepted – including by standards bodies such as VESA – that a monitor requires a refresh rate of 75Hz or above for a flicker-free display. A computer’s graphics circuitry creates a signal based on the Windows desktop resolution and refresh rate. This signal is known as the horizontal scanning frequency, (HSF) and is measured in KHz. A multi-scanning or autoscan monitor is capable of locking on to any signal which lies between a minimum and maximum HSF. If the signal falls out of the monitor’s range, it will not be displayed.

Calculating Maximum Refresh Rate

Where VSF = vertical scanning frequency (refresh rate) and HSF = horizontal scanning frequency the formula for calculating a CRT monitor’s maximum refresh rate is:

VSF = HSF / number of horizontal lines x 0.95

So, a monitor with a horizontal scanning frequency of 96kHz at a resolution of 1280×1024 would have a maximum refresh rate of:

VSF = 96,000 / 1024 x 0.95 = 89Hz.

If the same monitor were set to a resolution of 1600×1200, its maximum refresh rate would be:

VSF = 96,000 / 1200 x 0.95 = 76Hz.

GD Star Rating
loading...
GD Star Rating
loading...
CRT Monitor Resolution and Refresh Rates (VSF), 7.3 out of 10 based on 3 ratings

Latest Articles

2002 Site Updates

Date Details of updates 1Dec '02 Processors: Section added on Intel's Hyper-Threading technology, designed to improve processor performance by exploiting the multi-threaded nature of contemporary operating systems and applications, and introduced at the same time as the Pentium 4 CPU … [Read more...]

042315_0136_GoodDealsAd1.jpg

GoodDeals Ads Removal Tips and Tool

GoodDeals Ads is an adware application that displays pop up ads. It is very pervasive and shows ads on just about every page that you visit. This PUP (potentially unwanted program will display ads, popups, coupons. It will also underline words in the text you read and insert banners into the web … [Read more...]

Win 7 Security 2012

Remove Win 7 Security 2012

Win 7 Security 2012 Win 7 Security 2012 is part of a multi rogue malware set. It goes by several different names. The purpose of this kind of malware client is to trick or force the user into making a purchase of the program. It does this by blocking normal programs from running and not letting … [Read more...]

Virus Guides

052515_0445_PicExaViewe1.png

PicExa Viewer Removal Guide

Picexa Viewer is a program that can be downloaded from its own website or some of the free download sites found online. It is touted as being an image viewer that delivers fast results. But, the company behind this, Taiwan Shui Mu Chih Ching Technology Limited has a reputation for delivering suspect … [Read more...]

052215_1340_MSTechSuppo1.gif

MSTechSupport.info Scam Removal

You may be getting random popups in your browser from a company claiming to be MSTechSupport.info. These can happen inside any browser like Internet Explorer, Chrome or Firefox. This is a scam trying to trick you into thinking there is a company on the other end ready to help you. It is caused by … [Read more...]

Leave a Reply

Your email address will not be published. Required fields are marked *