Communications: electrical – Continuously variable indicating – With meter reading
Patent
1984-11-30
1987-11-17
Caldwell, Sr., John W.
Communications: electrical
Continuously variable indicating
With meter reading
340781, 340811, 34082581, 3151693, G09G 330
Patent
active
047076925
ABSTRACT:
A resonant mode energy recovery circuit is disclosed for supplying drive pulses to an electroluminescent (EL) display arranged as a matrix of pixels addressed by a plurality of column and row electrodes. An external inductor is used to alternately store and supply energy from the column electrodes of the EL display which has an impedance equivalent to an array of capacitors and resistors. Switching transistors and diodes are used to start and stop the resonant current flow at 1/4 wavelength intervals of the resonant frequency of the resonant tank formed by the external inductor and the array capacitors coupled to the column electrodes in order to form the pulses required to address the columns of the matrix. Switched current sources are used to start and stop nonresonant current flow to form the refresh and write pulses used to form the pulses required to address the rows of the matrix. Together, the pulses applied to the columns and rows of the matrix provide the high voltage necessary to light the EL pixels while minimizing the address time and power required to operate the EL display.
REFERENCES:
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patent: 3991416 (1976-11-01), Byles et al.
patent: 4070663 (1978-01-01), Kanatani et al.
patent: 4238793 (1980-12-01), Hochstrate
patent: 4253097 (1981-02-01), Hochstrate
patent: 4254362 (1981-03-01), Tulleners
patent: 4349816 (1982-09-01), Miller et al.
patent: 4485379 (1984-11-01), Kinoshita et al.
M. R. Miller & R. P. Tuttle, "A High-Efficiency Drive Method for Electroluminescent Matrix Displays" Proceedings of the SID, vol. 23/2, 1982, pp. 85-89.
"The AC Thin Film Electroluminescent Display" taken from Display Driver Handbook, 1983, Texas Instruments, pp. 2-33, 2-39.
Cooper Eugene A.
Cordy, Jr. Clifford B.
Eaton Bill
Higgins Marvin L.
Brier Jeffery A.
Caldwell Sr. John W.
Fromm Jeffery B.
Hewlett--Packard Company
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