Make sure that your slider Wrapping Container allows you to go fullwidth and fullheight, and there is no limitation in width / maxwidth.In case your container is Boxed, and you want to force the Slider to go Fullscreen, than simple use the forceFullWidth:"on" parameter !
If you wish to have an Offset top and bottom, since you have some header or Footer, or both, please take a look on the example 03B here: 03B.Sample-FullScreen-Offsets
<script type="text/javascript">
var revapi;
jQuery(document).ready(function() {
revapi = jQuery('.tp-banner').revolution(
{
delay:15000,
startwidth:1170,
startheight:500,
hideThumbs:10,
fullWidth:"off",
fullScreen:"on",
fullScreenOffsetContainer: ""
});
}); //ready
</script>