Monitor Glossary

    Monitor Glossary

    Actual Image Size (also Viewable Screen size)
    Diagonal measurement of screen from corner to corner. This is dependent on the timing signal provided by the video card.

    Aperture Grill Pitch
    Measures the horizontal distance between two stripes of the same color. The smaller the aperture the sharper and clearer the image.

    Richness of the colors a monitor can display is related to the level of brightness.

    Contrast Ratio
    The ratio between the peak white level and the black level of a display.

    Cathode Ray Tube picture tube or screen.

    Dot Pitch
    Distance between two dots of the same color on screen. Larger the dot pitch the fuzzier, grainier the image. Smaller the dot pitch, i.e. .26mm as opposed to .28mm, the clearer and sharper the image.

    Mismatch of phosphor and Vertical refresh giving appearance of flashing. CTL monitors support normal & Vesa flicker free modes.

    Overall sharpness of the display.

    Horizontal Frequency
    An indication of how long it takes to scan Horizontal lines that make up display, measured in kilohertz (kHz)

    Interlaced/Non Interlaced
    Interlaced involves two passes when painting an on-screen image, painting every other line on the first pass and filling in the rest on second pass, causing flicker on display. Non Interlaced paints all of the lines in one pass and then paints an entirely new frame. Non interlace monitors deliver flicker free images, making them more preferable over less expensive interlaced monitors.

    Standard recognized worldwide for electrostatic, and magnetic emissions. This standard was developed by the Swedish National Board for Measurement and Testing.

    Refresh rate
    How many times per second the entire screen is redrawn, or how the monitor paints a complete monitor screen. For example a refresh rate of 160 Hz means the screen is drawn 160 times per second. Higher refresh rates produce less flicker.

    Response Time
    Response time is the amount of time that it takes the display to change a specific pixel from one (display) state to another. Response Time is of particular importance in LCD Screens. In LCD Screens with slower response times, a fast moving screen image can appear blured if it moves faster than the screen can update the pixels.

    Inward bowing of the image, all monitors have a slight amount of pincushion distortion.

    Number of pixels or dots per inch (DP or DPI)

    Vertical Frequency
    The number of lines on an entire screen. The higher the Vertical frequency (Refresh Rate) the less flicker is produced. A higher vertical refresh requires higher Horizontal Frequency.

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