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CRT Monitor refresh checking and warning Disclosure Number: IPCOM000015044D
Original Publication Date: 2001-Dec-16
Included in the Prior Art Database: 2003-Jun-20
Document File: 1 page(s) / 40K

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CRT Monitor refresh checking and warning


When setting up a PC or other computer equipment with a CRT type display, most IT proffesionals does not fine tune the setup of the graphics card. As a result most CRT monitors today flicker at the default refresh rate, typically 60 Hz.

    Most workplace regulations prescribe 'flicker free' or 70 Hz+ refresh rates. So far, the only way of checking the refresh rate was to see it in the windows driver, find it in the OSD menu, or use an external measuring device.

    The industry have deviced new technologies (PnP, DDC) to remove these problems, but they persist in end user environments.


    The solution is to add a program to the CRT monitor, that checks the refresh rate when the monitor changes mode.

    If the refresh rate in the new mode is below 70 Hz, the program displays a warning on the screen (OSD), e.g. "Your display is not running at optimum refresh rate. Consult your graphics card documentation to get a flicker free image."

As such the solution adds no cost to monitor manufacturing. Note that all externally driven CRT monitors can utilize this technology.