There are two fundamental categories of electronic functions that affect the quality of the projected image from the Marquee, or any CRT projector.

The most obvious category is the quality of the video circuitry from the input through to the CRT grid. In the Marquee projector, the video circuitry is contained on the Video Input Module (VIM) and the three individual neck boards. Improving the rise times and the, often overlooked, settling times of the individual video stages can remove any vestige of blurring on sharp edges within the picture; especially at high scan rates. Lower noise amplifiers, improved power supply decoupling and filtering and, in a few cases, extra shielding can reduce visible picture noise. Improved DC stability can better hold the black level, which is visibly much more important than the peak white level.

In the other category are the many functions that affect the size of the electron-beam spot that scans the picture onto the phosphor-coated face of the CRT. First among these are the adjustable static focus that makes the spot size as small as possible at the center of the screen and the astigmatism adjustment that helps minimize the spot size by making the spot as round as possible. Second are the dynamic signals that adjust both the focus and astigmatism, in order to maintain the small size of the spot as it flies around the face of the tube, plus the zone adjustments for both. Third are the deflection voltages that actually drive the beam and spot around the screen. Extraneous noise in any of these circuits can put jitter into the size, shape, or position of the spot, thus creating a visible blurring of the spot or the scan lines that it draws.

This series of modified Marquee modules described below completely address all of these issues throughout the entire projector, using the latest in components and drawing on our many years of experience with the Marquee Platform.