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Phosphor for Single-Gun Full Color CRT

IP.com Disclosure Number: IPCOM000040470D
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 3 page(s) / 30K

Publishing Venue

IBM

Related People

Ohtaki, T: AUTHOR [+2]

Abstract

This article describes two types of phosphors for achieving full color capability by switching anode voltage and anode current. 1. Advantages CRTs using these phosphors have the following advantages: (a) compared with the shadow mask color CRT, -excellent picture resolution, -high-brightness, and -cheap peripheral circuit; (b) compared with the current sensitive color CRT and the penetration color CRT, -large color gamuts (full color capability). 2. Structure TYPE(1) The phosphor comprises an uniform mixture of a double-layered particle PAB and of a particle PC . (Fig. 1) (Image Omitted) Particle PAB comprises Phosphor A with coating of Phosphor B. Particle PC comprises Phosphor C.

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Phosphor for Single-Gun Full Color CRT

This article describes two types of phosphors for achieving full color capability by switching anode voltage and anode current.
1. Advantages CRTs using these phosphors have the following advantages: (a) compared with the shadow mask color CRT, -excellent picture resolution,

-high-brightness, and

-cheap peripheral circuit; (b) compared with the current sensitive color CRT and the penetration color CRT,

-large color gamuts (full color capability). 2. Structure TYPE(1)

The phosphor comprises an uniform mixture of a

double-layered

particle PAB and of a particle PC . (Fig. 1)

(Image Omitted)

Particle PAB comprises

Phosphor A with coating of Phosphor B.

Particle PC comprises Phosphor C. TYPE(2)

The phosphor comprises an uniform mixture of a

double-layered particle PDE and of a particle PF .

(Fig. 2)

Particle PDE comprises Phosphor D with coating of Phosphor


E.

Particle PF comprises Phosphor F. Phosphor A - F have the following characteristics:

Phosphor A : Sublinear brightness - anode current

characteristics

(Image Omitted)

Phosphor B : Sublinear brightness - anode current

characteristics

Phosphor C : Superlinear brightness - anode current

characteristics Phosphor A, B, C have different emission colors.

Phosphor D : Superlinear brightness - anode current

characteristics

Phosphor E : Superlinear brightness - anode current

characteristics

Phosphor F : Sublinear brightness - anode current

characteristics Phosphor D, E, F have different emission colors. 3. Characteristic

The characteristic of the phosphors of TYPE(1) will be explained with reference to Figs. 3 and 4.

(1) Low anode current (Fig. 3(a)) When the anode current is low, the emissions of phosphor A and B are large than that of phosphor C. As anode voltage is changed, the emission color changes as follows:

1

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-when the node voltage is low, the emission color is (i) in

Fig. 4;

-when the node voltage is medium,...