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 POSITION: Home >> Technical Data >> Other Technologys >> The optics principle of back project screen
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The optics principle of back project screen

1. The definition of optics screen
  Contains one or many optics lens system screen is called optics screen, inside the lens, the light is refracted, the direction has had the change, is only back project large screen to be able to control the light the direction, therefore is only in back project large screen only then to have the optics screen;
  The light direction is decided by: Screen material refraction coefficient and lens section plane shape.
 
2. Optics Fresnel Lens
  You can find the difference between the ordinary lens and fresnel lens from this picture bellow:
The difference between the ordinary lens and fresnel lens
  In the fresnel lens only has the curved surface is in the lens the function part, if removed other parts and level the effective lens are partial (like the picture) obtained fresnel lens. The lens use the diamond by the CAD/CAM processing center to cut, on the screen, reaches 10,000 kinds of different lens section planes together, the back project screen mold investment to be huge, DNP corporation is only has own mold factory the back project large screen manufacturer. Therefore the DNP each kind of series product all has the different focal distance; Each section plane size is equal to the screen the dot pitch (Resolution Ratio).

3. The principle sketch map of the fresnel lens & columnar lens and their coalition.
The principle sketch map of the fresnel lens & columnar lens and their coalition
    The coalition of fresnel and columnar lens can achieves 180° level visual angle, the DNP large screen wide-angle series therefore obtains the giant market share in the whole world, becomes large screen which in the for many years market most has received welcome, is suitable for each kind of application situation. The screen which unite by fresnel lens and fog shape lens also is one of nine kinds of screens series in the DNP corporation. It is specially, several years ago which develops for certain special applications on have put in the market. But because the angle of view was inferior to the wide-angle screen series, the surface is too narrow, DNP corporation only takes it as one kind of supplement product.

4. The difference between the double-decked screen and single-layer screen
The difference between the double-decked screen and single-layer screen
Some characteristics about the double-decked screen:
It has brightness uniformity which center to the corner more better than single-layer screen;
Extremely is suitable for the short distance projection;
Extremely is suitable for multi-screens splicing.

5. Two kinds of filter system work schematic diagram of the DNP corporation double-decked screen contrast.
Two kinds of filter system work schematic diagram of the DNP corporation double-decked screen contrast
The first kind: High-contrast columnar lens optics principle: (UCS/RUCS Screen)
  Have covered a melanin level between two lens optics lens surfaces, may absorb the environment light, the columnar lens can collect the projector the light, and transmits to view regarding, but the front environment light can absorb.
The second kind: High-contrast vitreous-ball optics principle: (BB Screen)
  This kind of technology is the use tiny vitreous-ball, and spurts in a side spreads a melanin level. The vitreous-ball can collect the projector the light, and transmission to view regarding. According to directly is absorbed on the large screen environment light.

 

  

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