Pace IT - Display Devices

Display devices.

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.

PACE-IT.

– Pixels and lumens.

– Analog vs. digital displays.

– Types of display devices.

Display devices.

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.

Lumens are one measurement of lightoutput 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.

Display devices.

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.

Display devices.

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.

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.

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.

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.

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.

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Pace IT - Display Devices

Education

Transcript of Pace IT - Display Devices