Symmetric drive for an electroluminscent display panel

DETAILED DESCRIPTION An object of the present invention is to provide an improved symmetric drive for an electroluminescent (EL) display panel which reduces latent images on the display panel.
Another object of the present invention is to reduce latent images on an EL display panel which employs gray scaling.
Yet another object of the present invention is to provide an improved symmetric drive with reduced circuit cost and complexity capable of supporting gray scaling for an EL panel.
According to the present invention, an improved symmetric drive for an electroluminescent display panel includes a single power supply which provides two voltage signal values of opposite polarity V.
sub.
pos,V.
sub.
neg, and corrects the difference between the two voltage signal values V.
sub.
pos,V.
sub.
neg as a function of the difference between the maximum column driver voltage value V.
sub.
col and its nominal value.
The present invention utilizes a single power supply having a single switching regulator to generate the opposite polarity row voltages which significantly reduces the circuit complexity and cost associated with providing a symmetric drive for an EL panel.
These and other objects, features and advantages of the present invention will become more apparent in light of the following detailed description of a best mode embodiment thereof as illustrated in the accompanying drawings.