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Output devices that create hard copies of computer files. Some printers specialize in particular applications, such as printing color photographs. All-in-one printers are designed to provide multiple services, such as printing, scanning, faxing, and copying.

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A Smart TV runs an operating system which allows it to receive input from the user and connect to many content sources over the Internet and from smartphones, tablets, and other connected devices. Using a Smart TV virtually eliminates the need for a set-top box. A set-top box is a device which connects a standard TV to content sources such as a cable, satellite, or streaming.

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Output devices for audio signals. Most computers have audio support either integrated into the motherboard or on an adapter card. Audio support includes ports that allow input and output of audio signals. The audio card has an amplifier to power headphones and external speakers.

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Digital Light Processing (DLP) is a projection technology. DLP projectors use a spinning color wheel with a microprocessor-controlled array of mirrors called a digital micromirror device (DMD). Each mirror corresponds to a specific pixel. Each mirror reflects light toward or away from the projector optics. This creates a monochromatic image of up to 1024 shades of gray in between white and black. The color wheel then adds the color data to complete the projected color image.

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Plasma displays are another type of flat panel monitor that can achieve high levels of brightness, deep black levels, and a very wide range of colors. Plasma displays can be created in sizes of up to 150 inches (381 cm) or more. Plasma displays get their name from the use of tiny cells of ionized gas that light up when stimulated by electricity.

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An organic LED display uses a layer of organic material that responds to electrical stimulus to emit light. This process allows each pixel to light individually, resulting in much deeper black levels than LED. OLED displays are also thinner and lighter than LED displays.

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A light-emitting diode (LED) display is an LCD display that uses LED backlighting to light the display. LED has lower power consumption than standard LCD backlighting, allows the panel to be thinner, lighter, brighter, and display better contrast.

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Liquid crystal display (LCD) is commonly used in flat panel monitors and laptops. It consists of two polarizing filters with a liquid crystal solution between them. An electronic current aligns the crystals so that light can either pass through or not pass through. The effect of light passing through in certain areas and not in others is what creates the image. LCD comes in two forms, active matrix and passive matrix. Active matrix is sometimes called thin film transistor (TFT). TFT allows each pixel to be controlled, which creates very sharp color images. Passive matrix is less expensive than active matrix but does not provide the same level of image control. Passive matrix is not commonly used in laptops.

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These input devices are typically used on a computer to authenticate the user. A smart card may be the size of a credit card with an embedded microprocessor that is typically under a gold contact pad on one side of the card.

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Biometric Identification Devices Input Device

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Biometric Identification Devices Input Device

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These input devices identify a user based on a unique physical feature such as their fingerprints or voice. Many laptops now have fingerprint readers to automate logging in to the device.

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This device allows a designer or artist to create blueprints, images, or other artwork by using a pen-like tool called a stylus on a surface that senses where the stylus tip is touching it. Some digitizers have more than one surface, or sensor, and allow the user to create 3D models by performing actions with the stylus in mid-air.

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These devices digitize an image or document. The digitization of the image is stored as a file that can be displayed, printed, or altered. It is widely used for pricing and inventory information.

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Digital Camera and Digital Video Camera Input Device

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Digital Camera and Digital Video Camera Input Device

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These input devices capture images that can be stored, displayed, printed, or altered. Stand-alone or integrated webcams capture images in real time.

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These are input devices for playing games. Game pads allow the player to control movement and views with small sticks and multiple buttons. Many game pads also have triggers that register the amount of pressure the player puts on them. Joysticks are often used to play flight simulation-style games.

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These input devices have touch or pressure sensitive screens. The computer receives instructions specific to the place on the screen that the user touches.

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These are the two most commonly used input devices. The keyboard is used to enter text while the mouse is used to navigate the graphical user interface.