光学原理
 
    dnp高对比度过滤屏幕（CFS）是一款双层光学屏幕，将提高亮度的透镜系统与具有高对比度的崭新技术滤光镜融为一体。CFS屏幕的光学透镜由7层光学设计而组成，每一层都具有独特的光学特性。
 
    菲涅耳元件上的两个活动透镜系统可折射背投光线，并以准确的角度直接投射向观众。在透镜元件的背面，配备超密间距透镜的薄膜将光线均匀分布到扩散层。在下一层中，背投光线需穿过间距仅为0.065毫米的高对比度滤光镜，防止入射光线破坏图像质量。覆盖60％屏幕表面的黑色凹槽可以有效吸收环境光，阻挡窗户和室内照明的反射。屏幕表面的防眩层不仅能够进一步削减环境光的不良影响，而且还可以防静电、抗划痕。
 
光学规格 
    新型CFS屏幕可提供4.5的高增益度和40˚水平半增益角，宽阔的视角可提供卓越的图像质量。8˚垂直半增益角确保在多层屏幕排列的显示墙上提供均匀亮度的图像质量。
 
更多信息
    dnp对比度滤镜屏幕TM由世界上最大的光学背投屏幕制造商——丹麦dnp公司生产。如需了解更多信息，请访问dnp公司的网站： www.dnp.dk 

dnp sets new standards for control room displays
 
At Integrated Systems in Shanghai, April 27-29 2005, dnp denmark launches a new generation of high contrast screens with dramatically improved contrast, brightness and viewing angles.
 
The new dnp Contrast Filter Screen™ (CFS) from the world’s leading manufacturer of optical rear projection screens is the successor to the dnp Ultra Contrast Screen, which is used in many of China´s most sophisticated control room display walls.
 
- Normally, higher contrast means lower brightness or vice versa. But this new lens architecture provides contrast ratios which are twice as high as those of the dnp Ultra Contrast Screen – and at the same time a much brighter image. The vertical viewing angles have also been increased by more than 10% to improve brightness uniformity in high display walls with several rows of screens, says dnp´s R&D Manager, Søren Weis Lindegaard. 
 
Another major improvement is the screen definition. With an ultra-fine pitch of 0.065 mm, a 50” version of the screen provides a horizontal resolution of 15,000 lines and infinite vertical resolution. This eliminates any form of moiré problems with LCD and DLP screens.
 
The CFS Screen, which is available in sizes up to 70”, will be on display at Integrated Systems in Shanghai from 27-29 April. For further information, please visit dnp denmark at booth no. 208 – or contact dnp Sales & Marketing Assistant, Birgitte Shakira Thorsøe at +45 46 16 51 00 or bt@dnp.dk.
 
Optical principles
The dnp Contrast Filter Screen (CFS) is an optical double element screen that combines brightness enhancing lens systems with a new high contrast filter. The optical lens design of the CFS Screen comprises 7 layers, each with its own optical property: 
 
Two active lens systems on the fresnel element redirects the rear projected light and sends it forward at right angles towards the viewers. At the back side of the lenticular element, a film with ultra-fine pitch lenses spreads the light evenly to a diffuser layer. The next layer allows the rear projected light to pass through a high contrast filter with a pitch of 0.065 mm that blocks incident light from damaging the image. The black grooves, which cover 60% of the screen surface, effectively absorb ambient light and eliminate reflections from windows and room lighting. The impact of the ambient light is further reduced by the matt layer on the screen surface, which also features an anti-static, scratch coating. 
 
Optical specifications
 
The new CFS Screen delivers a peak gain of 4.5 and horizontal 1/2 gain angles of 40˚ and superior image quality from wide viewing angles. The vertical 1/2 gain is 8˚ to ensure brightness uniformity in tall display walls with several rows of screens. 
 
Further information
The dnp Contrast Filter Screen™ is produced by dnp denmark - the world’s largest manufacturer of optical rear projection screens. For more details, please visit dnp’s website at www.dnp.dk