Display device

A display shows us information.

Some use light to show pictures. These are electronic displays. You see them on a computer. You see them on a TV.

Other displays use small parts. These parts turn on and off. They can show numbers. They can even show letters. Some are used in watches. Some are used in calculators. Some displays use bumps. People who cannot see use them. They feel the shapes with fingers. These displays help us see and feel.

A display device shows information to people.

Most displays use light to show pictures or words. These are called electronic displays. You can find them on a computer or a TV.

Some displays only show numbers or letters. These are called segment displays. They use small parts called segments. These segments turn on and off to make a shape. A seven-segment display only shows numbers. A fourteen-segment display can show numbers and letters. Some displays cover a full area like a rectangle. We often call these video displays. They are used in smartphones and VR headsets.

There are many ways to make these screens. Some use liquid crystals, which are called LCDs. Others use small lights called LEDs. Some use organic lights called OLEDs. There are also tactile displays. These use parts that move. They help blind people feel images with their fingers. This lets them feel text or shapes.

A display device is a tool used to show information.

Most of these tools show things in a visual way. Some can even show things in a tactile way. Tactile means you can feel it with your touch. This is very helpful for blind people. They can use tactile electronic displays to feel images. One example is called Optacon. It uses metal rods instead of light. This helps people feel text with their fingers.

Many displays work using an electrical signal. We call these electronic displays. Some displays only show certain shapes. These are called segment displays. They are made of small parts called segments. These segments turn on and off to make a shape. A seven-segment display shows only numbers.

A fourteen-segment display can show numbers and Roman alphabet letters. A sixteen-segment display can also show letters. You might see these in a digital watch. You might also see them on a pocket calculator.

Some displays cover a whole area like a rectangle. These are often called video displays. They are used to show moving pictures. You can find them on a television set. They are also in computer monitors. Some people use them in virtual reality headsets.

Other uses include medical monitors and smartphones. Even video walls use these types of displays. Many of these use a way of working called multiplexed display technique. This helps drive the different parts of the screen.

There are many different ways to make a screen.

One way is using liquid-crystal displays, or LCDs. Another way uses light-emitting diodes, or LEDs. Some screens use organic light-emitting diodes, known as OLEDs. There are also quantum dot displays, called QLEDs. Other technologies include plasma display panels, or PDPs. Some newer ideas are still being tested. These include using carbon nanotubes. There is also a type called microLED that is in development.

Display technology is all around us every day. You see it when you look at a smartphone. You see it when you watch a TV. Some older displays used cathode-ray tubes, or CRTs. Other mechanical types have been used in the past. A split-flap display is one example. Ticker tape is another historical type. These tools help us see and feel the world. They turn electrical signals into things we can understand.

A display device is an output device used to present information.

This information can be presented in a visual form or a tactile form. Tactile displays are used to provide information through touch. This is often used in electronic displays for blind people. For example, a device called Optacon uses metal rods instead of light. These rods convey images to people through tactile sensation. Most displays that use electrical signals are called electronic displays. They turn these signals into something a person can see or feel.

Many electronic displays are segment displays. These devices do not show full images. Instead, they show specific digits or alphanumeric characters. They are called segment displays because they use several segments to create a shape. These segments switch on and off to form a specific glyph, or symbol. The segments are usually made of liquid crystals or single light-emitting diodes (LEDs).

Common types include seven-segment displays, which only show numerals. There are also fourteen-segment and sixteen-segment displays. These can show both numerals and Roman alphabet letters. You often find these in pocket calculators or digital watches.

Another major category is full-area 2-dimensional displays. These cover a large, usually rectangular, area. They are often called video displays because they are the main way to show video.

These displays are used in many different ways. You can find them in television sets and computer monitors. They are also used in smartphones and mobile devices. Some specialized versions include head-mounted displays, heads-up displays, and virtual reality headsets. They are also used in medical monitors and large video walls.

To make these full-area displays work, engineers use different underlying technologies. One common method is the liquid-crystal display, or LCD. Another is the light-emitting diode, or LED. Many modern screens use a backlit LCD or a thin-film transistor (TFT) LCD. There are also quantum dot displays, known as QLED. Some advanced screens use organic light-emitting diodes, or OLED. These can be further categorized into AMOLED and Super AMOLED displays.

Other technologies include plasma display panels (PDP) and electroluminescent displays (ELD). Most of these devices are driven by a method called the multiplexed display technique.

Scientists and engineers are always developing new ways to show information. Some technologies are still being tested in labs. For example, surface-conduction electron-emitter displays (SED) and field-emission displays (FED) are experimental. Carbon nanotubes are also being studied as an experimental technology. There is also microLED technology currently in development. Other specialized methods include digital light processing (DLP) and interferometric modulator displays (IMOD). Even laser-powered phosphor displays exist. These different technologies allow for different levels of brightness and color.

Display technology can also move into three dimensions. Three-dimensional displays go beyond a flat surface. These include swept-volume displays and laser displays. Holographic displays and light field displays are also ways to create 3D images.

While these are more complex than 2D screens, they represent the next step in how we interact with digital information. They aim to provide a sense of depth that a flat monitor cannot provide.

Before modern electronic screens, people used mechanical types of displays. These did not rely on light-emitting parts. One historical type was ticker tape. Another was the split-flap display, which is also called a flap display.

There are also flip-disc displays, also known as flip-dot displays. Other mechanical versions include vane displays and rollsigns. These mechanical systems moved physical parts to show information to people. This shows how display technology has evolved from moving parts to complex electronic signals.