• Output devices can be described as the devices that are used to show the information processed by a computer system in a human-readable form.
• The information shown by output devices can be in text, graphics, video, audio, etc.
2. 2D & 3D cutter
3. Headphones & speakers
5. Flat-panel display screens
• Inkjet printers are usually used in homes and small offices for printing less volume of papers.
• It has a moving head that prints characters by spraying droplets of liquid ink on the ribbon from the cartridge.
• These printers produce less noise and use thermal bubble technology for the spraying of droplets.
• It is an output device that cut holes or shapes on a 2D flat surface.
• It can be a paper cutter or an industrial metal cutter.
• The cutter uses a laser to cut through different materials and different thickness surfaces without the need to change the machine.
• It provides precision cutting cost-effectively.
• 3D laser cutters are like 2D laser cutters but they can cut at many different angles.
• There are different types of 3D cutters available and some do not use a laser to cut through the object.
• These cutters have the ability to cut beneath the object's surface without scratching or damaging.
• The surface beneath cutting is typically done in glass or crystals.
Speakers and Headphones
• Speakers and headphones are both used for producing sound as an output.
• Speakers produce the sound that can fill the room whereas, headphone keeps the sound to one wearing it.
• These output devices produce sound by converting the digital signals into analogous sound waves.
• These sound waves are audible to human ears.
• These output devices can be used to hear music as well as to communicate and listen to other people.
• Actuators are used in robotics and control systems.
• These are output devices often control the movement in the real world by taking a signal from the microprocessor.
• For example, automatic mall doors.
• These are the most common form of output devices.
• In LCD screens, the display is created by combining gree, blue and red light filters available in each pixel.
• In a single LCD screen, there are millions of pixels (tiny blocks) available.
• Showing display is possible in LCDs because each pixel has liquid crystals that can be manipulated to allow fluorescent tube backlight in controlled proportion via the RGB filters on the screen front.
• These are similar to LCD screens however, the light source in both is different.
• In LED screens, small LED bulbs are responsible for providing the light.
• In some screens, the entire display unit back is covered with these bulbs and in other models, only the edges have these bulbs.
• The screens with only edges bulbs are thinner.
• LED screens are power efficient in comparison to LCD screens.
• Projectors are output devices that show the display over the wall or large screen from a computer system.
• Projectors are best used during presentations or class lectures.
• Prices vary for different projectors; small projectors are reasonable but projectors capable of displaying movies in cinemas are expensive.
• In LCD projectors, a high-density light beam passes through the LCD to the screen or wall.
• In a projector, there is a LED/ bulb from which a powerful white light is generated.
• A group of chromatic coated mirrors is used to reflect this white light at different wavelengths.
• The reflected light has wavelengths equal to RGB.
• These three different light wavelengths, show the image to be displayed in greyscale and with the help of the colored light that passes through the LCD, a colored version emerges from the greyscale images.
• Using a special prism, these images are then combined and the projector lens displays the image on the wall/screen.
• Unlike an LCD projector, it uses a fast-spinning color wheel filter.
• The filter is responsible for splitting the lamp light into RGB light.
• A bank (chip) made up of thousands of microscopic mirrors (pixels) is used to project the image.
• The color wheel filter and mirrors are synchronized to turn away or towards the light as required.
• The image is then magnified and projected out of the sense on the screen/wall.