As described above, there were various opinions about the quality of images on the Pure Mat screen with different coatings, N2.0 and N4.0. Backcoatings were originally meant to prevent the impact of light coming from the window when the screen is placed in front of the window, by applying a coating at the back of the screen because light coming from the window will be in conflict with light projected onto the screen, and will affect the contrast of light. Though it was preferable to use white paint to reflect light, and black paint to absorb light, we finally decided to proceed with a neutral color, N4.0, for a backcoating, and aimed to achieve both effects.
Last but not least, the following are the characteristics of the Pure Mat II
1) Screen adaptable to high-output projectors
In 2000, the quantity of light from a projector exceeded 500 ANSI lumens. Around 1990, projectors generated only dim light, so projection screens needed to cover up their lack of light. Projection screen manufacturers were asked to offer projections screens with a gain of 2.0 or more. Projection screens were required to compensate for the lack of light from projectors. Because projectors generate more light now, high gain screens will be effective when old projectors are used, or when light from the outside cannot be eliminated. The Pure Mat avoids *color shifts and *hot spots. A gain chart also shows that projection screens except for diffusion-type projection screens are characterized by significant peaks, which make images and colors look unnatural.
*color shifts:The phenomenon in which a color tone shifts with the degree of incidence angle of light.
*hot spots:The phenomenon in which the center of a screen becomes bright.
2) User-friendly screen
The Pure Mat enables perfect light diffusion even with wrinkles (though both glass bead and pearl fabric screens have high gain, settings are limited for them to deliver their performance, so it is difficult to use the screens). Ordinary matte screens do not diffuse light sufficiently. The Pure Mat offers higher diffusivity.
3) Screen in view of the moire patterns (interference patterns) caused by digitized images
Liquid crystal projectors produce *moire patterns (interference patterns) that are caused by interfering pixel lines and structural ridgelines in screens. Cloths with indistinct ridgelines were selected for the Pure Mat. In addition, the Pure Mat is made with a weft and warp that were randomly woven in order to make special structures. The Pure Mat succeeded in controlling moire patterns (interference patterns) as less as possible.
*moire patterns:The noise which the unevenness of a screen side and the pixel of a liquid crystal projector interfere in the fine hole of embossing on the surface of a screen, or a sound screen etc., and is generated
4) Materials with less environmental burdens
OS Co., Ltd. has been actively working on global environmental issues, and obtained ISO14001. As part of our efforts for global environmental conservation activities, we have been working hard on the development of products that will replace polyvinyl chloride products. Because the Pure Mat is made of fiber and free from polyvinyl chloride, it is expected to join the mainstream of new materials in the future.
