The difference between the touchscreen and the LCD screen

A touch screen is an electronic input device that users can control with single - or multi-touch gestures.  The touch screen enables the user to interact directly with the displayed content, rather than using a mouse, touchpad, or any other intermediate device.  

 
Some touch screens can be controlled with a finger;  Others may require the use of specially coated gloves or a special stylus.  
 
In 1977, Ben Stumpe, a Danish electronics engineer, developed a prototype touchscreen.  The development of multi-touch technology began in 1982, when the input Research group at the University of Toronto introduced the first multi-touch system for personal computer input.  It uses a glass panel with a camera behind the glass.  Then, in 1985, a team at the University of Toronto, including Bill Buxton, developed a multitouch tablet computer that used capacitors instead of a cumbersome camera-based optical sensing system.  
 
Touch-screen devices are now the industry standard on most smartphones, tablets and most laptops.  Most homes will have at least one touchscreen device, and our customers are no exception.  
 
Because of their popularity, these screens brake from time to time.  What many users don't consider is that the touch screen and the actual LCD screen are two separate parts.  
 
So:  
 
A touch screen (aka a digitizer) is a thin, transparent layer of plastic that reads signals from touch and transmits them to a processing unit.  It is the part that can be touched without disassembling the device.  
 
An LCD screen is the panel inside the device that displays images.  You can't get to the LCD screen without taking it apart first.  
 
When only the touch screen is broken, you can still see what's happening on the screen and the screen still works.  
 
When only the LCD is broken, you can still use the touch screen, but the panel will have black spots or cobweb-like cracks (or both).  
 
When both the LCD and touch screen are damaged, you may still be able to use part of the touch screen, and part of the LCD may display images, but there are significant difficulties with normal use of the device.