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Output unit
A display unit is a device used to display results or information that has been processed. It converts the output from electrical signals of a computer into a form that humans understand, such as letters, numbers, special symbols, images, animations, and sounds, etc. The display devices that are currently used are.
1. Display the results on the screen (Monitor) is a device that can be used to display results in letters, numbers, still images and movies while the computer is turned on only But when the computer is shut down, results cannot be seen. The screen may be called a temporary display unit. There are many types of screen used today.
1.1 CRT (Cathode Ray Tube Monitor) is a screen with a shape. And the same technology as television, which is to say that the technology is based on a beam of light through a glass tube Large display effect called Cathode ray tube Which causes quite a lot of light to the user's eyes.
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1.2 LCD (Liquid Crystal Display Display Monitor) is a flat screen. And uses the technology of liquid crystal or liquid crystal, thus saving electricity and light that shines to the user's eyes. Which helps preserve the eye more than CRT screen LCDs are divided into 2 types as follows
1) TFT (Thin film Transistor) or Interactive matrix Is a screen that is responsive to the display that is quite sensitive Fast processing Make the display resolution Bright and very sharp Often used in notebooks PDA, digital camera, etc.
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2) The passive matrix screen is a screen that provides less brightness and contrast than a TTT screen. Often used as a general mobile phone screen Or the screen of the computer screen, Palm computer, white and black.
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1.3 LED screen (Light Emitting Diode) is a screen that uses a small light bulb projection system. Which has led the technology of LED lamp to be used to make the rear light of the famous car Honda as well. The origin of the use of this type of projection is that the LED lamp will act as a light source And there are 3 colors of crystals that are solid, semi liquid, red, blue and green Twisting together in degrees, and for the light from the LED to pass through so that it projected into a beautiful, colorful image on the screen.
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1.4 Plasma monitor is a screen with technology that provides a viewing angle of 160 degrees, brighter and clearer than LCD. Can display fast moving images well, which is very suitable for watching movies and sports.
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Buying screen
1. should choose the type of screen suitable for use If having to use the computer continuously for about 4-8 hours, should choose LCD images.
2. Should choose a monitor that is suitable size for use. There are currently 2 standard sizes that are popular, 15 inch and 17 inch. The 17 inch screen advantage is suitable for graphic design. Because there is more space but is more expensive than the 15 inch screen
3. The screen should have a service center with warranty.
Monitor maintenance
1. Turning on the computer The screen should be turned on before opening the computer case and should not be opened. Turn off the machine next to each other. Should leave the machine for 5-10 minutes before turning on the new machine. Because turning on and off the machine in succession can cause the machine to malfunction and the machine may freeze.
2. The brightness of the screen should be adjusted to suit the lighting of the working room and working conditions. Because if the screen brightness is adjusted too much Will make the screen last longer.
3. The screen preservation program should be set to extend the screen lifetime.
2. Show results via printer
A printer is a device that displays results in the form of report data, images on paper, which can be touched and preserved for a long time. The printer may be called Permanent display unit Currently, there are many types of printers as follows
2.1 Inkjet printer This type of printer is commonly used with personal computers. Because it is not very expensive The printing principle uses the method of spraying small drops of ink onto the paper. The advantage is that the ink droplets do not spread or seep together. Color printing ink requires a color cartridge that is contained in a tri-color cartridge. Normally, each color usage will run out at the same time. If one of the colors runs out, it will cause the printer to not work. Therefore, some companies have separated the inks for each color. In order to be free to change colors for economy Some models may separate the black ink separately for black printing only. In most cases, injectable inks are expensive when compared to the average number of sheets printed. But the work is more beautiful, clear, more suitable for the work that needs exquisite beauty.
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2.2 Laser printer works like a photocopier By using a laser to create a positive charge on a sheet of paper that passes through The toner with a negative charge is absorbed with a positive charge. From then, the hot rollers help the ink stick to the paper. Laser printers have a high print speed and have an average printing cost per sheet cheaper than ink injection printers. Suitable for jobs that require large amounts of print, such as offices, educational institutions, photocopies etc.
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Buying a printer
1. Should choose a printer that is suitable for the type of work desired If it is a lot of document printing Should choose a laser printer And if it is a small print job and needs a quality print job Should choose to use the printer to inject ink
2. The printer should have a service center and warranty.
Printer maintenance
1. Should use quality paper and the size should not be thicker than 90 grams.
2. The cartridge should be stored in a dust-free area and at a low temperature.
3. The printer should be turned on at least once a week. Especially the printer injecting ink To prevent the printer nozzles clogging
1.3 speakers
Speaker is a device that displays audio format results Most of which will be provided with a computer with 2 types of speakers as follows
1.3.1 Built-in speaker There are buttons for adjusting the volume, such as the volume button for adjusting the volume, the base button for adjusting the bass volume, and the treble button for adjusting the treble volume.
1.3.2 Speakers without audio amplifiers There will be a cone of the speaker used within the speaker (small), approximately 2 inches. This type of speaker must use a sound card with an amplifier circuit for amplifying the sound of the speaker.
Buying a speaker
1. Should listen to the test first The test should be turned on the loudest and lowest level to hear the clarity of the sound.
2. Should choose speakers that have a service center and warranty.
Speaker maintenance
1. The front of the speaker should be cleaned By using a duster or a small vacuum cleaner
2. Should be turned on at a moderate level or 80 percent will help extend the lifespan. Because if the opening is too loud May damage the speaker |
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