Projection Screen

The projection screen according to claim 20, wherein, in case of direct projection of images with reflection of projector light flow, a rear side of the screen has a light-reflecting coating with a reflection coefficient of 0.1 to 0.999, and a value of roughness on the reflecting surface is no more than ¼ of the violet light wavelength in the transparent matrix material.

(canceled)

The projection screen according to claim 20, wherein the outer surfaces of the composite matrix have an anti-reflective coating.

The projection screen according to claim 20, wherein the frontal or frontal and rear outer surfaces of the matrix are satined with microlens, raster, prism or multi-spike structures having random distribution of sizes and/or directions of the structures extended in the surface plane and having a typical size of roughness cross-sections of no more than ¼ of the violet light wavelength in the transparent matrix material.

The projection screen according to claim 20, wherein a fine-dispersed light-scattering component in the form of aerogel, micro-spherules, micro-crystallites, powder and similar components or mixtures thereof of oxides of titanium, calcium carbonates or other white pigments with a typical size of not more than ⅕ of the width of gaps between discrete image elements at the screen is introduced into the volume of the matrix uniformly across the screen, and a total amount of these composite components in the matrix is selected so that they would cumulatively overlap at least 15% of the image area.

The projection screen according to claim 20, wherein a microdispersed luminescent additive having a typical time of afterglow from 0.02 to 0.3 seconds is introduced into the matrix, and a total amount of this additive is selected based on organoleptic criterion of image flicker invisibility at a projector projection frame rate.

The projection screen according to claim 20, wherein a fine-dispersed light-absorbing component in the form of fibers, powder, needle- or sphere-shaped nanostructures is introduced into the matrix to provide contrast and playback of black color, the total amount of said component per area of light flow overlapping being determined by the condition of preserving at least one third of a total useful light flow from the projector.

The projection screen according to claim 20, wherein the matrix is made of high-molecular polymeric materials in which polymer macromolecules are predominantly oriented along the course of light beams of the projector.

The projection screen according to claim 20, wherein the screen has a cylindrical or ellipsoidal shape with radii in the horizontal and vertical cross-section planes being from the minimum viewing distance to infinity.

The projection screen according to claim 20, wherein the front surface of the screen is covered with light-absorbing fibers oriented perpendicularly to the plane of the screen surface.

The projection screen according to claim 20, wherein the frontal surface of the screen is covered with light-absorbing fibers oriented predominantly along the course of projector light beams in case of a rear projection screen or along the median of the courses of projector direct and inverse beams in case of a retroreflective screen of front projection.

The projection screen according to claim 20, wherein the functional irregularities are distributed across the matrix thickness layer-wise and/or with a continuously varying concentration within the layer or throughout the whole matrix thickness.

The projection screen according to claim 20, wherein the screen is provided with a light valve layer of controlled light flow transmittance.

The projection screen according to claim 20, wherein the screen is provided with a system for automatic adjustment of light transmission depending on brightness of an external illumination.

A projection screen for forming an image by converting light pixel pulses from a digital projector, the screen including a three-dimensional sheet matrix made of a transparent composite, the matrix being defined by a frontal and a rear surfaces thereof, wherein functional inclusions for light-scattering, light-absorbing and luminescence of the light from the projector are distributed through the matrix thickness to thereby enable the conversion of the light pulses into the image for direct perception by eyesight to be performed throughout the volume of the matrix, the matrix thickness between the frontal and rear surfaces being for digital image sources selected between an inter-pixel grid width and tenfold diagonal size of a pixel of a digitized image on the screen.