Liquid vapour displays (LVDs) are the latest in economical display technology.They operate on the principle of a new reflective passive display and depend on the presence of ambient lights for their working.
structure of a typical LVD cell is shown in figure.In its simplest form,it consists of roughened glass surface wetted with a transparent volatile of some refractive index as that of glass.The rear surface is blackened.A voltage drive is used for heating the transparent electrode.
In the "off" condition of display (i.e.,with no voltage applied to the transparent electrode),the black background is seen through the front transparent glass electrode and the liquid.In "on" condition(i.e.,with voltage applied to the transparent electrode),electrode gets heated causing the evaporation of liquid in contact with it,and,therefore,a combination of vapour film and vapour bubbles is formed around the roughened glass surface.Since the refractive index of vapour is roughly unity,there is a discontinuity established between the front glass plate and the liquid,which results in light scattering.This makes it a simple display devices.This has a better constrast ratio as compared to LCD,but its speed of operation is low.
structure of a typical LVD cell is shown in figure.In its simplest form,it consists of roughened glass surface wetted with a transparent volatile of some refractive index as that of glass.The rear surface is blackened.A voltage drive is used for heating the transparent electrode.
In the "off" condition of display (i.e.,with no voltage applied to the transparent electrode),the black background is seen through the front transparent glass electrode and the liquid.In "on" condition(i.e.,with voltage applied to the transparent electrode),electrode gets heated causing the evaporation of liquid in contact with it,and,therefore,a combination of vapour film and vapour bubbles is formed around the roughened glass surface.Since the refractive index of vapour is roughly unity,there is a discontinuity established between the front glass plate and the liquid,which results in light scattering.This makes it a simple display devices.This has a better constrast ratio as compared to LCD,but its speed of operation is low.
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