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How a Conventional Flat, Square Monitor Works (page3)

Technical Tour

Why no other monitor comes closer to reality

Imagine we are inside your monitor looking at the backside of your computer screen. If you look at the magnifying glass to the right the small dots you see are called phosphors - the technology that creates the images on your monitor screen.

What makes our monitors produce better images?

One of the differences that make Hitachi monitors so unique is the way we arrange our phosphors. If you look carefully at the screen of a Hitachi monitor, you will see clearer, crisper images - even at the edges and corners where other monitors tend to become fuzzy. In addition, the color will look more vivid with superior focus and clarity. We do this by using Shadow Mask technology. If you look to the right, you will see the layout of a Shadow Mask and Aperture Grill.

The drawing on the left shows the aperture grill, which is how some other monitor manufacturers achieve color images. The picture on the right is Hitachi’s shadow mask technology with our famous dot trio rounded phosphor dots. We at Hitachi feel that the Invar shadow mask technology we utilize provides better color purity that is more stable and dependable than aperture grill. Furthermore, aperture grill monitors contain two support wires (called damper wires) that hold the vertical lines together. These two damper wires are frequently visible as lines running across your screen and images, providing a distracting image distortion. With Hitachi’s Invar shadow mask - you will never see these lines distorting your screen images.

By using Invar shadow mask technology, a high precision element that keeps the electrons from hitting the wrong phosphor dots, Hitachi monitors provide greater color purity than other monitors. By using a special metal with a very low expansion rate called Invar, Hitachi eliminates the displacement distortions that some monitors (usually the lower quality, less expensive ones) face when their shadow masks heat up and warp slightly.

Why our dot pitch produces better pictures

The thing that makes our images so crisp and our colors so real is our Enhanced Dot Pitch (EDP), which we use on all our latest monitors. In the drawings to the right, you see magnified images of the dot phosphors that compose the images on your Hitachi monitor. The dot pitch is the distance between the adjacent red/green/blue phosphor groups. To simplify things, with any monitor, the smaller the dot pitch, the sharper the images will be. When looking at Hitachi’s EDP dot configurations, at the right, please notice that the horizontal and vertical resolutions are more uniform and the dots are larger. This combination provides several important advantages. First, this creates a larger phosphor area, which creates higher maximum brightness and better control of brightness and contrast. Second, the uniformity of resolution makes small text more legible. Finally, the larger dots give you an increased color purity margin, which is why images and text are clearer on a Hitachi monitor.

Superior Focus

Hitachi monitors use either our proprietary A-EDF (Advanced Elliptical Aperture, Dynamic Focus) or our proprietary PrecisionFocusTM electron gun technology. These guns automatically adjust the focal length while the beam is scanning. In addition, it also controls the cross sectional shape of the beam. This ensure crisp, clear images both mid-screen and in the corners. In addition, Hitachi’s PrecisionFocusTM technology is 10% sharper than the previous state-of-the art. By inserting two additional focus lenses and improving the beam size, the PrecisionFocusTM technology available on many of Hitachi’s monitors provides an even higher level of brightness and clarity.


Every Hitachi monitor is carefully designed to meet or exceed rigid safety and ergonomic standards. So, you can be confident that the one you buy will fully comply with important electrical and mechanical safety standards, low radiation, and flicker-free images. In fact you’ll find that the way we eliminate flicker is a big reason why user comfort is a major Hitachi advantage. If you look at the specifications on Hitachi’s monitors, you will notice that the refresh rates are all VESA standard (75 Hz) and above - even at high resolutions. This means that you will have a rock solid image without annoying flicker - which is frequently linked to eyestrain and headaches. In the final analysis, Hitachi monitors combine the quality and comfort critical for the long hours people spend viewing their monitors. You don’t have to take our word for it. We encourage you to visit the "Reviews" section of this site that features awards and reviews that Hitachi monitors have received. Thank you for taking the time to get to know Hitachi monitors and we hope this technical tour has been helpful in understanding our products. For further information we encourage you to call or email our Customer Relations department (information available in the "Contact" portion of our site) and one of our representatives will be happy to provide additional information and assistance.

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