US3753032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crt with built-in display registration test
Assignee: RTX Corp
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Filing: 1971-07-27
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Granted: 1973-08-14
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Expires: 1991-07-27
Abstract
Abstract The face of a cathode ray tube is treated so as to provide inactive areas thereon, either by having the face of the CRT opaqued before the deposition of phosphor thereon, or by having the phospor selectively removed, such as by etching or scribing, in any desired configuration. The inactive areas are in the form of simple check symbols which may be continuously generated, said symbols being invisible so long as complete registration occurs, and become visible so as to indicate fault, whenever the registration or symbol generation apparatus driving the CRT fails to operate within tolerance. Flashing symbols may be utilized to direct attention to the loss of registration, and a purposeful misregistration may be introduced in the system to test for the generation of the normally invisible check symbols. The inactive areas may be sufficiently fine so as not to detract from other displayed information during normal system operation.
Inventors
- 👤 H Naidich
- 👤 J Boncer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:10
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/04; G01S7/06; G09; G09G; G09G1/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
100 words
A system for the selective displaying of symbolic information on the face of a CRT comprising: A CRT at least one inactive area on the face of said CRT, said inactive area being inoperative to generate a light image as the result of the impingement thereon of the beam of the CRT; symbol generating circuitry for presenting to said CRT control signals generating a check mark symbol which will, in normal operation, register with said inactive area and thereby be invisible, said check mark symbol becoming visible in the event that the generation or registration thereof falls outside of tolerance.
Claim 2
Independent Claim
100 words
A system for the selective displaying of symbolic information on the face of a CRT comprising: A CRT at least one inactive area on the face of said CRT, said inactive area being inoperative to generate a light image as the result of the impingement thereon of the beam of the CRT; symbol generating circuitry for presenting to said CRT control signals generating a check mark symbol which will, in normal operation, register with said inactive area and thereby be invisible, said check mark symbol becoming visible in the event that the generation or registration thereof falls outside of tolerance.
Claim 3
Dependent Claim
101 words
In the method of monitoring operation of a CRT raster swept display symbol presentation system, the steps of: providing a CRT having an area of the display face thereof rendered inactive so as to be incapable of generating a light image in response to the beam of the CRT impinging thereon; providing signals for controlling said CRT so as to generate patterns of light images at the face of the CRT, said signals including signals generating a check mark symbol which under normal operating conditions is registered at the inactive area on the face of said CRT and is therefore invisible.
Claim 4
Dependent Claim
101 words
In the method of monitoring operation of a CRT raster swept display symbol presentation system, the steps of: providing a CRT having an area of the display face thereof rendered inactive so as to be incapable of generating a light image in response to the beam of the CRT impinging thereon; providing signals for controlling said CRT so as to generate patterns of light images at the face of the CRT, said signals including signals generating a check mark symbol which under normal operating conditions is registered at the inactive area on the face of said CRT and is therefore invisible.
Claim 5
Dependent Claim
41 words
The method according to claim 2 including the additional step of temporarily altering said signals so as to cause registration of said check mark symbol at least partially on areas of said surface of the CRT exclusive of said inactive area.
Claim 6
Dependent Claim
45 words
The method according to claim 2 wherein said step of providing signals includes providing signals generating said check mark signal as a time varying function which when displayed at other than said inactive area would readily attract the attention of a viewer of said CRT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |