A protective cover safeguards delicate LCD screens and flips up for screen access. 保护面能够维护液晶显示屏的灵敏性和触摸效果。
They require little current, need no backlighting and can be produced for little more than half of the cost of a liquid crystal display screen. 它们需要的电流很小，不需要背光，并能以液晶显示屏一半多一点的成本生产。
