Title:
INTENSITY CONTROLLER OF VIDEO
Document Type and Number:
Japanese Patent JPS605693
Kind Code:
A
Abstract:
A video signal is pre-conditioned by signal conditioning means (22, 32, 24, 34) to establish a prescribed reference level during image blanking intervals (TB). The prescribed reference level is afterwards further modified by means (36) adding a black-going pulse component (D) to the video signal during the blanking intervals. The magnitude of the added pulse component is adjusted in accordance with the setting of an adjustable brightness control (38) to control the brightness of images displayed by an image display device included in the system. Controlled video signals are AC coupled (65) to an intensity control electrode (CATHODE) of the display device KlNESCOPE by means (70) including a DC restoration circuit which responds to the magnitude of the added blanking interval pulse component, for establishing the DC bias of an intensity control electrode and thereby image brightness.
Inventors:
ROBAATO RII ROJIYAASU ZA SAADO
Application Number:
JP11215484A
Publication Date:
January 12, 1985
Filing Date:
May 30, 1984
Export Citation:
Assignee:
RCA CORP
International Classes:
H04N5/57; H04N9/72; H04N9/73; (IPC1-7): H04N9/72; H04N5/57
Domestic Patent References:
| JPS463308A | ||||
| JPS49131539A | 1974-12-17 | |||
| JP45020402A | ||||
| JPS5126835U | 1976-02-27 | |||
| JPS5512791A | 1980-01-29 | |||
| JPS586689A | 1983-01-14 |
Attorney, Agent or Firm:
Satoshi Shimizu (2 outside)
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