Apparatus for driving electroluminescence panel

Details Apparatus for driving electroluminescence panel Apparatus for driving electroluminescence panel

1988-12-21

1990-12-04

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

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

340716, 350345, G09G 330

Patent

active

049756923

ABSTRACT:
There is provided an apparatus for driving an electroluminescence (EL) panel which is arranged on the back side of the display surface of an LCD and used as a back light thereof. This apparatus comprises: a driver to drive the EL panel of the LCD; a signal generator to generate a plurality of signals having frequencies which are difficult from at least a frequency of a drive signal of the LCD and harmonics of the drive signal; a selector to select one of the signals generated by the generator; a supply circuit to supply an AC voltage having the frequency of the selected signal to the driver as the drive signal of the EL panel; a detector to detect whether the drive signal frequency to the EL panel lies within a frequency range where an interference is exerted on the display surface of the LCD or not; and an adjusting circuit to adjust so that the drive signal frequency is deviated out of the frequency range to exert an influence when the detector detects that the drive signal frequency lies within the frequency range. The driver consists of a self-excited or separately excited inverter. Thus, the luminence deterioration can be minimized and the generation of an interference fringe pattern with the LCD can be suppressed and the EL panel can be driven at a high reliability.

REFERENCES:
patent: 4253097 (1981-02-01), Hochstrate
patent: 4443741 (1984-04-01), Tanaka et al.
patent: 4500173 (1985-02-01), Leibowitz et al.
patent: 4562433 (1985-12-01), Biferno
patent: 4580877 (1986-04-01), Washo

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