A typical pc

Output devices: display screens

Display screens are essential output devices used to present visual information from electronic devices to users. They come in various types and sizes, each with specific characteristics and applications. Here are some common types of display screens:

1. 
   Liquid Crystal Display (LCD): LCD screens consist of a panel of liquid crystals that manipulate light to create images. They are commonly used in computer monitors, laptops, televisions, and smartphones. LCDs offer good image quality, color reproduction, and wide viewing angles.
   
2. 
   Light Emitting Diode (LED) Display: LED displays are a type of LCD screen that use light-emitting diodes as a backlight source. They provide enhanced brightness, contrast ratios, and energy efficiency compared to traditional LCDs. LED displays are commonly found in large outdoor advertising billboards, digital signage, and high-definition televisions.
   
3. 
   Organic Light Emitting Diode (OLED) Display: OLED screens use organic compounds that emit light when an electric current passes through them. They offer better contrast ratios, wider viewing angles, and faster response times compared to LCDs. OLEDs are widely used in smartphones, tablets, and high-end televisions.
   
4. 
   Plasma Display Panel (PDP): PDP screens use small cells of ionized gas to emit ultraviolet light, which then illuminates phosphors to create images. While PDPs were popular in the past, they have been largely replaced by LCD and LED technology due to their higher power consumption and heavier weight. PDPs were commonly used in large-sized televisions.
   
5. 
   E-paper Display: E-paper displays, also known as electronic paper or e-ink displays, are designed to mimic the appearance of ink on paper. They use microscopic capsules containing charged particles that respond to electric fields to display text and images. E-paper displays are commonly found in e-readers, such as Amazon Kindle devices.
   

These are just a few examples of display screens commonly used as output devices. Each type has its own advantages and disadvantages, making them suitable for different applications based on factors such as size, power consumption, image quality, and viewing angles.