W x y z – Philips 109B75-27B User Manual
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Tilt function
See rotation function.
Trapezoid distortion
See Geometrical distortion.
TTL signal
A TTL (Transistor-transistor-logic) signal is a digital signal level for controlling the screen colors.
With TTL driving, the red, green and blue signals can only be switched on or off or provided with
an intensity signal. A TTL-driven monitor can thus display a maximum of 64 colors. Video
standards such as MDA, CGA and EGA are based on TTL level.
V
Vertical dot pitch
See Dot pitch.
Vertical scanning frequency
Expressed in Hz, this is the number of fields written to the screen every second in interlaced
mode. In non-interlaced mode vertical scanning frequency is the number of frames (complete
pictures) written to the screen every second (also known as refresh rate).
Vertical sync pulses
A train of square shaped waveforms that define the start of a new frame.
VESA
Video Electronic Standards Association, a consortium of manufacturers formed to establish and
maintain industry-wide standards for video cards and monitors. VESA was instrumental in the
introduction of the Super VGA and Extended VGA video graphics standards (see Video graphics
adapters) with a refresh rate of 70 Hz, minimizing flicker and helping to reduce operator eyes
fatigue and stress.