Lesson_7_-_Display_Devices (1)

Lesson_7_-_Display_Devices (1) - Lesson 7 Display Devices...

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Unformatted text preview: Lesson 7 Display Devices Can you Answer these Q’S 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. What is a peripheral? Give examples of input and output peripherals What devices use USB ports Discuss the different USB connections: version and types Discuss IEEE 1394 - What does IEEE stand for and the different versions Discuss PS/2 and Bluetooth What is expansion and how do we expand on a computer’s capabilities? Dscuss common categories of expansion cards Discuss the different video card connector types Discuss colour coded audio connectors Understanding Display Types Regardless of what type of video card (or cards) is in a computer, it means nothing if the computer doesn’t have an output device. That’s where the display comes in! Video Display Types LCD,LED Monitors, OLED, Plasma, Projectors LCD - Liquid Crystal Display ❏ ❏ ❏ ❏ Flat panel display that consists of two sheets of polarizing material surrounding a layer of liquid crystal solution. Most common video output device in a computer HOW IT WORKS: ? v=0B79dGR19Tg Most of today’s LCD screens are thin film transistor (TFT) active matrix displays. *Technology used to improve image quality* LCD Cont’d 2 types of important active matrix LCD technologies: 1. 2. ❏ ❏ ❏ Twisted nematic (TN) - Uses liquid crystals that actually twist and untwist at different angles, letting certain amounts of light through. Less expensive LCD monitors will used TN technology. In-plane switching (IPS) - Aligns the liquid crystals on a plane that is parallel to the glass Uses an additional transistor for each picture element. Uses more power than TN and produces better colour production and wider viewing angles. LCD Displays use CCFL - Cold Cathode Fluorescent Lamp as the lighting source Measurements of LCD: Resolution (definition native resolution is best!) and Contrast Ratio (Comparison of brightest and darkest colour) The higher the resolution + contrast ratio the better! Quick Challenge: How to clean lcd monitors With a partner research the safest ways to clean an LCD Monitor 5 minutes ❏ ❏ ❏ 1. 2. ❏ ❏ ❏ LED Monitors use “light-emitting diodes” to display images LED technology is used in computer monitors, televisions, billboards, and storefront signs. Can use 2 different types of technologies: Surface-mounted device (SMD) technology - More common for LED monitors; it uses red, green, and blue diodes that are mounted as individual triads Discrete LED technology - Clusters the triades together into pixels LED monitors work in the same way as LCD except they use a different backlight LED monitors use light-emitting diodes, which release photons. Process known as electroluminescence. OLED - Organic light-emitting diodes - Main advantage of OLED is cost. Cheaper than LED. Common in mobile devices,digital cameras, and media players. LED MONITORS Plasma ❏ ❏ ❏ ❏ Rarely found in computer monitors but often found in televisions Computers can use plasma television screens as their monitors so long as the computer has the correct type of video port HOW THEY WORK: Use small cells that contain electrically charged ionized gases; Basically they are fluorescent lamps Known for brightness but consume more energy than LCD. Projectors ❏ ❏ ❏ ❏ Video projectors can be plugged into a computer external video port to project the computer’s video display An extremely light bulb is used to project the image on the screen Light output is measured in Lumens Projectors are available in LCD, LED, and DLP (Digital Light Processing) versions Colour DEPTH Known as bit depth or colour quality is the term used to describe the number of bits that represent colour What is 1 bit colour? 1-bit colour in the binary numbering system means a binary number with one digit. 16-bit, 24-bit, and 32-bit colour are the most common colour depths used in Windows. RESOLUTION ❏ ❏ ❏ ❏ ❏ ❏ Display resolution is described as the number of pixels (picture elements) on a screen It is measured horizontally and vertically Aspect ratio is an image’s width divided by its height The ratio, I.e. 4:3 means that for every 4 pixels running horizontally, there are 3 pixels running vertically. Wider resolutions = higher first number. I.e. 16:9 Most current laptops + desktops have widescreen format default (16:9, 8:5, 16:10) Resolution Type Full Name Pixel Dimensions Aspect Ratio VGA Video Graphics Array XGA Extended Graphics Array 1024x768 4:3 (1.333:1) SXGA Super Extended Graphics Array 1280 x 1024 5:1 (1.25:1) UXGA Ultra Extended Graphics Array 1600 x 1200 4:3 (1.333:1) WXGA min (720P) Widescreen eXtended Graphics Array minimum 1280x720 16:9 (1.78:1) WXGA Widescreen eXtended Graphics Array 1280x800 16:10 (1.6:1) HD Ready High Definition similar to WXGA (used for laptops) 1366x768 16:9 (1.78:1) REFRESH RATE Resolution Type Full Name Pixel Dimension Aspect Ratio WSXGA+ Widescreen Super eXtended Graphics Array Plus 1680x1050 16:10 (1.6:1) WSXGA+ (HD) Widescreen Super eXtended Graphics Array Plus (High Definition) 1680x945 16:9(1.78:1) WUXGA Widescreen Ultra eXtended Graphics Array 1920x1200 8:5 (1.6:1) HD 1080p & 1080i Full High Definition 1920x1080 16:9 (1.78:1) QHD (WQHD) 1440p Quad High Definition 2560x1440 16:9(1.78:1) UHD 4K Ultra High Definition 3820x2160 16:9 (1.78:1) Refresh Rate and osd ❏ ❏ ❏ ❏ Refresh rate refers to the number of times a display is “painted” per second OSD or the “On Screen Display” can help configure picture quality Can help fix problems like: distortion, picture size, centering, contrast and brightness You can access the OSD by pressing a button below the display or on one of the sides. From there use arrows to make modifications. Socrative Challenge Displays Troubleshooting Video Issues 20 mins 1. With a partner research potential video issues. 2. Focus on the symptoms and what you, as a technician, can do to check/troubleshoot 3. Use the next slide to guide your research. WHAT TO CHECK IF YOU’RE HAVING ISSUES *** 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. Connections Power cycle the computer, display, and any power protection equipment Check for an onboard video setting in the UEFI/BIOS Resolution settings Check the driver Check the version of DirectX Check the temperature threshold of the video card Use software to check and repair stuck or dead pixels Calibrate the monitor Use a filter on the monitor Check for newly installed applications Check inside the computer ...
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