1. ErgoFlat Technical Overview CM771 & CM772
Hitachi’s 19” ErgoFlat monitors were among the first Flat-faced Invar Shadow Mask monitors in the world.
Now users can experience the combined benefits of Flat-faced shadow masked technology and Hitachi’s ErgoFlat Design. Flat-faced technology delivers vibrant, realistic, distortion-free images, with significantly reduced glare. Hitachi’s ErgoFlat technology enhances this performance with a Super High Contrast tube that delivers 10% improvements in brightness and clarity. And what’s more, Hitachi’s CM771 and CM772 ErgoFlat monitors accomplish this while saving space, with reduced depth of only 17.7-inches – the same as many 17” models.
Advantages of Hitachi ErgoFlat technology
ErgoFlat is Hitachi’s brand name for its flat-faced monitors – equivalent to what many call “perfectly flat”
or “pure flat”. Flat-faced monitors differ from traditional, slightly curved, “flat, square” (FS) monitors
and require more complex engineering to achieve the high quality, consistent image that customers prefer.
Hitachi has invested significant resources to ensure that its tube design leads the industry in brightness, quality and power conservation.
New rectangular Cone Deflection Yoke (RC DY) design
This newly designed gun provides higher efficiency and better images because it deflects images more efficiently. In the conventional circular yoke, the screen image occupies a smaller portion of the yoke (A) than than would a comparable image in Hitachi’s square-yoke design (B). As shown in illustration A the Electron Beam sweeps only in the rectangular area inside circular cone, requiring extra steps to properly deflect the beam at each corner. In illustration B, however, Hitachi’s new RCDY yoke, the Electron Beam sweeps the rectangular area inside the rectangular cone with amazing efficiency and accuracy, without requiring the additional steps. This increases accuracy and efficiency. In addition, the new yoke increases corner accuracy and focus significantly because the new, more accurate, beam sweeping pattern requires less compensation.
Recognizing the importance of energy conservation, Hitachi has designed its tube for the lowest possible
power consumption still consistent with normal use. While most monitors typically consume 125 – 135 W,
Hitachi’s 19” ErgoFlat models typically consume only 98 W– at least a 20% savings! With reduced power
consumption and significantly less thermal dissipation (heat emission) – this monitor is more environmentally
and economically friendly. A 20% saving for large corporate installations quickly cost-justifies these products.
A company with 5,000 monitors can potentially save 4,000 KW/h per month!
(Based upon a saving of: 25W/h x 8hrs x 20 days)
Conventional DY Hitachi RCDY a b

2. Dark inner filter coating
In addition, Hitachi’s ErgoFlat technology has many benefits over competitive products:
Many flat-faced monitors have difficulty achieving uniform light transmission. Hitachi has
designed the most advanced new graded transmission coating for consistent brightness and higher quality
images. In the illustration below, Hitachi achieves the following:
Brightness uniformity 80% min
Low surface reflection; 1.0% visual reflectance
This improves the performance
of Hitachi ErgoFlat monitors by
providing consistent brightness
and improves color accuracy.
Finally, by varying the
thickness of the inner glass,
combined with the new coating,
Hitachi achieves one of the
highest levels of brightness
consistency available on the market.
2) Other flat-faced monitors have difficulty achieving high brightness with the flat-faced design.
The average – low to mid-level aperture grill flat-faced monitors have a 38% light transmission (SHC level). Even most of the high-end aperture grill flat models have an average of only 41% light transmission
(SHC level). Hitachi’s ErgoFlat 19” models achieve a 44% light transmission (SHC level) due to
the improved phosphors and increased brightness – all while reducing energy consumption! In the illustration below, you can see how Hitachi’s Super High contrast tube and phosphor change – utilizing highly pigmented red & blue phosphors. This yields the highest light transmission for brighter, more vibrant colors. In addition, the dark inner filter coating in the illustration below enables Hitachi to achieve TCO ’99
compliance without the additional circuit compensation that most other monitors require. This enables a
more accurate, cost-effective product with reduced failure potential.
New TCO dark coating
High Contrast Color }
Flat face panel
78% low clear Glass
(Material can be recycled)
44% Transmission
Dark inner filter coating
Green
Red
Blue
Green
Highly pigmented phosphor(Red & Blue)

3. Dark inner filter coating
3) Superior color purity & low screen reflection.
Hitachi’s Super High Contrast image combines the highly pigmented phosphor for high brightness, the new TCO dark coating with its crisp, dark black colors and the dark inner filter coating, with a new stippled surface.This results in one of the crispest, best front-of-screen images available on the market. In the illustration below, Hitachi’s 78% low-clear glass allows colors to appear bright and vibrant while it reduces the visual reflection to an incredibly low 1.0%.
4) Tube design
Since Hitachi uses Invar Shadow Mask technology, its tubes do not face the heat expansion and doming problems that cause the Aperture Grill (AG) models to experience grill spreading and degraded image. Hitachi's inventive Invar Shadow Mask design achieves superior color uniformity without the additional circuitry correction that Aperture Grill (AG) flat-faced models require. Hitachi’s new, stronger shadow mask has a strength rating of 25G minimum. In addition, Hitachi’s specially designed inner curvature panel allows its tubes to maintain smooth diagonal lines while geometry may vary widely on other monitors. Hitachi’s ErgoFlat technology also features a super-fine dot pitch of 0.22 mm horizontal – which is much finer than the same horizontal measurement for most aperture grill models that average .25 or .27 horizontal.
We hope this overview is helpful. Please contact Hitachi’s computer monitor sales group with any additional questions.
Hitachi America, Ltd. Monitor Sales Group
200 Lowder Brook Drive
Westwood, MA 02090
44% Transmission }
Green
Red
Blue
New TCO dark coating
Flat face panel
78% low clear Glass
(Material can be recycled)
Dark inner filter coating
Ambient light
Reflected light