For example, the labels on a package-delivery tracking tool don't need to be backlit like those on a cell phone or TV remote control. 比如，包裹快递追踪使用的手持机一般来说就不需要有背光的按键标签，而手机和电视机遥控器往往是需要的。
Such signs would not have to be backlit in the way that a screen is, and they would probably be cheaper to make than liquid-crystal displays. 这样的标志不以屏幕背光的方式，它们可能比液晶屏便宜。
