Reflective projection screen and projection system
A projection screen, reflective technology, applied in the field of projection systems, can solve problems such as reducing brightness and contrast
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example 1
[0099] The projection screen was prepared in the following manner. First, 60% by weight of MEK, 23.48% by weight of vinyl chloride / vinyl acetate / vinyl alcohol copolymer, 8.52% by weight of carbon black, and 8.0% by weight of dioctyl phthalate were mixed to prepare a solution. Next, the solution was applied to a DBEF film manufactured by 3M Company, followed by drying to form a light absorbing layer having a dry thickness of 15 µm.
[0100] Another solution was made by mixing 70% by weight acetone, 22.5% by weight butyl acetate / acrylic acid, and 9.5% by weight polystyrene beads. Next, this solution was applied to the other surface of the DBEF film, followed by drying to form a light-diffusing layer having a dry thickness of 56 µm, thereby producing a screen. Comparative Example A
example 2
[0114] A front projection screen was fabricated from a multilayer reflective polarizing material sold by 3M Company as DBEF film.
[0115] A diffuser layer was applied to the front surface of the DBEF film to form the DBEF / diffuser composition. This diffuser layer contains many beads with a refractive index of 1.54 in a resin with a refractive index of 1.47. The beads had a nominal diameter of 5 microns and were present in the resin at a loading rate of 33% by weight. The thickness of the diffuser layer is about 50 microns. Figure 11 The reflective performance measurements of the front projection screen were plotted as a gain curve 832 to illustrate the screen's performance relative to other configurations in Examples 3 and 4 described below. Example 3
example 3
[0116] A front projection screen was constructed as in Example 2 above. Additionally, a black absorber layer was applied to the back of the DBEF film, opposite the diffuser layer, thereby forming an absorber / DBEF / diffuser combination. The absorber layer used was a flat black spray paint used to obtain an opaque layer on the back of the DBEF film. Figure 11 The reflective performance of the front projection screen is plotted as a gain curve 833 .
[0117] Figure 12 The performance of the front projection screen is also shown with a gain curve 843 for illustrating the performance of the present front projection screen in comparison to other screens with thicker diffuser layers of Examples 6 and 7 described below. Example 4
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