U.S. Philips Corporation

Thomas A Welker

Rifat A Hikmet

Albert A Comberg

Wolfram Czarnojan

Thomas Zaengel

Ralf Raue

Klaus Friedrich Carl

Light source having a luminescent layer (,) whose light is guided through an optical filter (,) comprising at least one cholesteric crystal layer (cholesteric filter).

Light source having a luminescent layer

The invention relates to a color television projection device having three planar monochromatic light sources for the background illumination of a viewing screen, in which a matrix-shaped electro-optical light valve is associated with each light source characterized in that the light sources are cathodo luminescent.

Color television projection device with cathodoluminescent light sources

An electron beam recording medium with a coating, which is applied to a substrate, is sensitive to electron beam radiation and has an organic rare earth metal type phosphor, is suitable for the irreversible writing of information with low-intensity electron beams.

Electron-beam recording medium

A green emitting phosphor for heavily loaded cathode-ray tubes comprises a mixture of a deep-green and a yellowish-green emitting phosphor. Mixtures of Zn.sub.2 SiO.sub.4 :Mn and at least one phosphor from the group comprising Y.sub.2 SiO.sub.5 :Tb; X.sub.2 O.sub.2 S:Tb; ES:Ce and XOZ:Tb, where X=Y, La, Gd, Lu; E=Ca, Sr, Ba; and Z=Cl, Br, I, F; satisfy, as FIG. 1 illustrates for a few examples, the EBU specification.

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Roetgen, Germany

Thomas A Welker