Electroluminescent panel driving system for driving the panel's

Details Electroluminescent panel driving system for driving the panel's Electroluminescent panel driving system for driving the panel's

1986-10-15

1989-04-18

Caldwell, Sr., John W.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340805, 34082581, 3151693, G09G 330

Patent

active

048231215

ABSTRACT:
An EL (electroluminescent) panel driving system includes a display control circuit for producing, line by line, an image data. The image data of each line is defined by a combination of a HIGH level signal representing a spot illumination of the EL panel and a LOW level signal representing a non-illumination of a spot on the EL panel. The system further includes a pre-charge circuit and a pull-up charge circuit for providing a first range voltage to the EL panel at the beginning of each line scan operation to make the EL panel ready to illuminate, and a write-in circuit and a source level switching circuit for providing a second range voltage to the EL panel to permit the spot illumination of the EL panel in accordance with the HIGH level signals contained in the image data. These four circuits are turned on by four signals. The driving system also includes a detector that detects when no HIGH level signal are present in the image data of a line, an AND gate array for cutting off the four signals from the pre-charge circuit, pull-up circuit, write-in circuit, and source circuit, the four circuits are prevented from being actuated, thereby cutting off the power normally supplied during the blank line scanning to save power.

REFERENCES:
patent: 3885196 (1975-05-01), Fischer
patent: 4032818 (1977-06-01), Chan
patent: 4187505 (1980-02-01), Morley et al.
patent: 4247855 (1981-01-01), Uede et al.
patent: 4338598 (1982-07-01), Ohba et al.
patent: 4485379 (1984-11-01), Kinoshita et al.
Nikkei Electronics, Apr. 2, 1979, "Practical Applications of Thin-Film Electroluminescent (EL) Character Display".

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