H - Electricity – 01 – J
Patent
H - Electricity
01
J
313/35.151
H01J 29/10 (2006.01) H01J 29/18 (2006.01) H01J 29/28 (2006.01)
Patent
CA 1125347
ABSTRACT OF THE DISCLOSURE A low-cost, deeply filtered television image display is depicted. A viewing screen includes a patterned layer of phosphor particles disposed contiguous to the inner surface of the display. The layer when excited emits light of a predetermined color. The display includes means for exciting selected areas of the layer to produce a luminescent informational image. The image is subject to loss of contrast caused by reflection of ambient light from the layer. The improvement comprises a shallow, random, clumped, discontinuous, open dispersion of contrast-enhancing particles of pigment having a body color corresponding generally to the predetermined color disposed directly on the viewing screen beneath the layer and not significantly admixed with the phosphor particles. The percentage of open area of the dispersion of pigment particles and the absorption characteristics thereof are such that the dispersion efficiently filters ambient light at its interface with the layer. This filtering is accomplished first by absorption of directly incident ambient light, and secondly by absorption of ambient light passing through the open dispersion and scattering back off the phosphor particles to the dispersion. The dispersion represents a tolerable impediment to image light emitted by the phosphor particles due to the shallowness and openness of the dispersion and its non-absorption of light of said predetermined color. The dispersion negligibly absorbs electron beam energy due to its location beneath the layer. As a result, deep filtration of ambient light and thus high picture contrast is made practicable without a disproportionately countervailing loss in picture brightness. -2-
338741
Macrae & Co.
Zenith Radio Corporation
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