# US 6,294,885 B1 · Beam index type color cathode ray tube

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- Number: US 6,294,885 B1
- Document ID: US6294885B1
- Status: Granted
- Kind: B1
- Application number: 09/500,605
- Filed: 2000-02-09
- Granted: 2001-09-25
- Earliest claimed: 1999-04-06
- Assignees: Samsung SDI Co., Ltd.
- Inventors: Sung-Soo Lee; Jae-Ho Lee
- Web page: https://patentgrep.com/patent/US6294885B1

## CPC

- H04N 9/24: using means, integral with, or external to, the tube, for producing signal indicating instantaneous beam position
- H01J 31/20: for displaying images or patterns in two or more colours {(circuits for colour television H04N9/16 - H04N9/28)}
- H01J 2231/121: Means for indicating the position of the beam, e.g. beam indexing
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)

## Abstract

Disclosed is a display device having a beam index type color CRT that includes an index signal controller for controlling input and output of index signals, an index memory for temporally saving the index signals in units corresponding to of a screened image of a scene on a screen panel, and a switch for switching the index signals that is under the control of the index signal controller.

## Claims

### Claim 1

A beam index type color CRT comprising;
a photo sensor for outputting an index signal;
an RGB switch for outputting a color signal;
an index signal controller for controlling and coupling the index signal and color signal;
an index memory for temporally saving the coupled signals corresponding to a screened image of a scene on a screen panel for re-use by the CRT; and
a second switch for controlling the flow of signals from the RGB switch and the index memory to the screen panel under the control of the index signal controller.

### Claim 2 (depends on 1)

A beam index type color CRT of claim 1 wherein the index signal controller can receive more than one set of index signals corresponding to a screened image of a scene.

### Claim 3 (depends on 1)

A beam index type color CRT of claim 1 wherein the index signal controller controls an electron beam to scan the screen panel on the basis of the previous index signals saved corresponding to a screened image of a scene.

### Claim 4

A beam index type color CRT comprising:
a means for receiving an index beam; and
a means for controlling generation of an electron beam in response to an output signal from said means for receiving an index beam, said controlling means having a switch means and a memory.

### Claim 5

A beam index circuit for a color CRT having a screen panel, comprising;
an index signal controller;
an index memory configured to temporally save an index signal corresponding to a screened image of a scene on the screen panel under control of the index signal controller;
an RGB switch configured to output a color signal; and
a second switch configured to couple the color signal from the RGB switch to the screen panel under the control of the index signal controller.

### Claim 6 (depends on 5)

The beam index circuit of claim 5 wherein the index signal controller can receive a plurality of index signals each corresponding to a screened image of a scene.

### Claim 7 (depends on 5)

The beam index circuit of claim 5 wherein the index signal controller is adapted to control an electron beam to scan the screen panel on the basis of the saved index signal corresponding to the screened image of the scene.

### Claim 8

A beam index type color CRT, comprising
a screen panel;
an electron gun configured to scan the screen panel with an electron beam;
an index stripe configured to generate an index beam from the electron beam;
a photo sensor configured to convert the index beam to an index signal;
an index memory configured to store the index signal for a screen image;
an index controller configured to control the electron gun as a function of the stored index beam;
an RGB switch configured to output a color signal; and
a switch configured to couple the color signal from the RGB switch to the screen panel under control of the index controller.