Pace IT - Display Devices
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The document provided outlines various display devices, categorizing them into analog and digital types while discussing their characteristics, performance, and technological differences such as resolution and light output. It emphasizes the significance of pixels and lumens in determining image quality, with a brief overview of CRT, LCD, LED, plasma, and OLED technologies. Additionally, it includes information about education and qualifications related to IT and a note about the funding sources for the program.
Pace IT - Display Devices
- 2. Page 2 Instructor, PACE-IT Program – Edmonds Community College Areas of Expertise Industry Certifications PC Hardware Network Administration IT Project Management Network Design User Training IT Troubleshooting Qualifications Summary Education M.B.A., IT Management, Western Governor’s University B.S., IT Security, Western Governor’s University Entrepreneur, executive leader, and proven manger with 10+ years of experience turning complex issues into efficient and effective solutions. Strengths include developing and mentoring diverse workforces, improving processes, analyzing business needs and creating the solutions required— with a focus on technology.
- 3. Page 3 PACE-IT. – Pixels and lumens. – Analog vs. digital displays. – Types of display devices.
- 5. Page 5 Display devices. – Pixels. » It is a word that was made up out of “picture elements” and represents a basic programmable unit of color on a display device or computer image. » In modern display devices, the pixel is a 24-bit block composed of 1-byte units of red, blue, green (RGB). » All colors are composed of combining various intensities (byte values) of the color components. The pixels are combined and the image is formed. The more pixels that are present, the sharper the resolution. • Resolution is a method of establishing how many pixels wide and tall an image is, which has an effect on the sharpness of the image. » Pixels are logical in nature, which means their size is not a set standard. The user gets to determine the resolution of the display.
- 6. Page 6 Lumens are one measurement of light output or brightness. The more lumens that are present, the more light that is output. Some display devices are rated for more lumens than others, which can have an impact on where they are deployed. For instance, a display device that doesn’t have a high lumen count will not work very well in a situation where there is bright ambient lighting. Display devices.
- 8. Page 8 Display devices. – Analog. » An image is created (digitally) and delivered to the graphics device. » The graphics device converts the image from its native digital format into a modulated electrical current format (analog) that is delivered to the display. » The display uses the analog format to represent the image on the screen. » Analog screens tend to be slower in processing images on the screen. » Many digital displays can receive an analog signal, which they then convert back to a digital format. – Digital. » A digital image is created and delivered to the graphics device. » The graphics device transmits the image to the display device. » The display device receives the digital image format and represents it on the screen. » It is the newer standard and tends to be faster than analog.
- 10. Page 10 Display devices. – CRT (cathode ray tube). » A CRT monitor uses a combination of a vacuum tube, an electron gun, and a fluorescent screen. » It is analog in nature. » The electron gun excites the individual pixels on the fluorescent screen, which light up and present the image. » Each line needs to be refreshed as the screen doesn’t hold an electrical charge. The rate at which it does this is called the refresh rate (too low of a rate will cause eye fatigue). » These monitors tend to have very good color representations and it is easy to adjust the resolution and get a good image. – Projector. » Output from the PC is sent to the projector, which transmits the image to a screen or wall. » It can be either analog or digital. » The amount of lumens that the projector is rated for is important, as it will affect the amount of ambient light that can be present and still allow the projected image to be seen.
- 11. Page 11 Display devices. – LCD (liquid-crystal display). » It is a type of flat panel monitor that uses an arrangement of liquid crystals and a fluorescent backlight to place an image on the screen. » The liquid crystals are sandwiched between layers of glass and make up the screen. An electrical current is used to change the alignment of the crystals, which then refract the fluorescent backlight, giving us the colored image. » The liquid crystals do not emit any light by themselves; the light we see is actually coming from the fluorescent backlight. Because of this, LCD monitors do not do well in very bright environments. » This is a digital technology. » It does have a native resolution for the screen (a pixel count that produces the best images) and the whole screen gets refreshed simultaneously. » It is faster and consumes less electricity than the CRT, but the color representation is not as good as that of the CRT.
- 12. Page 12 Display devices. – LED (light-emitting diode). » LED displays operate the same as LCD displays, except for one item—the LCD’s fluorescent backlight is replaced with an LED backlight. – Plasma. » It is a flat panel display technology that uses fluorescent cells contained in the screen (millions of them). An electrical charge is used to excite the cells and cause them to fluoresce in different colors, which causes the image to appear. This technology does not require the use of a backlight. » It is a digital technology. » Each screen has a native resolution. » It requires higher voltages than LCD or LED monitors. It tends to be more expensive than LCD or LED monitors, but it also produces better colors.
- 13. Page 13 Organic light-emitting diode (OLED) is an emerging display monitor technology. OLED is closer to LCD/LED technology than to plasma technology. The screen is composed of diodes that are sandwiched between thin layers of glass. An electrical charge is used to light up the diodes, which places the image on the screen. OLED displays are thinner, lighter, and consume less energy than all other display types. Except for the cell phone market, OLED technology has not spread very far because of the cost of creating the monitors. Display devices.
- 14. Page 14 Display devices. Pixel is a word derived from the term “picture element” and is usually composed of a 24-bit block of data. There is no standard size to the pixel; it is logical in nature. The higher the pixel count, the better the resolution. Light intensity is measured in lumens. The more lumens, the brighter the image. Topic Pixels and lumens. Summary An analog display needs to receive an analog signal from the graphics device. These tend to be slower than digital displays. Digital displays are faster and tend to consume less power than analog displays. Analog vs. digital. CRT use a vacuum tube, an electron gun, and a fluorescent screen to paint the image on the screen. It is an analog technology. LCD and LED use the same basic technology; the only difference is in the type of backlight. Plasma displays have better color representation, but are more expensive and use more power. OLED displays are very expensive, but are also the best performers in the flat monitor market. Types of displays.
- 16. This workforce solution was 100 percent funded by a $3 million grant awarded by the U.S. Department of Labor's Employment and Training Administration. The solution was created by the grantee and does not necessarily reflect the official position of the U.S. Department of Labor. The Department of Labor makes no guarantees, warranties, or assurances of any kind, express or implied, with respect to such information, including any information on linked sites and including, but not limited to, accuracy of the information or its completeness, timeliness, usefulness, adequacy, continued availability or ownership. Funded by the Department of Labor, Employment and Training Administration, Grant #TC-23745-12-60-A-53. PACE-IT is an equal opportunity employer/program and auxiliary aids and services are available upon request to individuals with disabilities. For those that are hearing impaired, a video phone is available at the Services for Students with Disabilities (SSD) office in Mountlake Terrace Hall 159. Check www.edcc.edu/ssd for office hours. Call 425.354.3113 on a video phone for more information about the PACE-IT program. For any additional special accommodations needed, call the SSD office at 425.640.1814. Edmonds Community College does not discriminate on the basis of race; color; religion; national origin; sex; disability; sexual orientation; age; citizenship, marital, or veteran status; or genetic information in its programs and activities.