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My Comptia A+ Studyguide > Display Devices > Flashcards

Display Devices Flashcards

1
Q

What are some of the specifications used by display devices?

A

-Resolution
-aspect ratio
-response time
-viewing angles
-refresh rate
-brightness
-contrast ratio
-color depth

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2
Q

What are the benefits of a higher resolution?

A

Higher resolutions mean that there more pixels per inch (PPI), resulting in more pixel information and creating a high-quality, crisp image.

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3
Q

What is the refresh rate?

A

refers to how many times per second the display is able to draw a new image.

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4
Q

The number of bits used for each color component of a single pixel

A

Color depth

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5
Q

A measurement of an image’s sharpness and clarity. The more pixels that make up an image, the higher its resolution

A

Resolution

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6
Q

use a variety of technologies to produce visual information

A

Display devices

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7
Q

-display visual information.
-are the most common type of display device and range in size from less than an inch to over 10 feet.
-backlight the screen.

A

LCDs (liquid-crystal displays)

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8
Q

-displays use white LEDs along one edge (usually the top) of the LCD and a light diffuser to backlight the screen.
-least expensive, thinnest, and most widely used type of LCD.

A

Edge-Lit White LED

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9
Q

-have an array of white LEDs behind the screen.
-are able to dim specific regions of the screen, resulting in a much higher contrast ratio than LCDs that use EL-WLED technology.

A

Full-array WLED displays

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10
Q

-have an array of special LEDs that are able to emit red, green, and blue light, resulting in superior color accuracy.
-are the most expensive type of backlighting technology.

A

RGB-LED displays

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11
Q

Older LCD monitors and some LCD HDTVs use cold cathode fluorescent lamps (CCFLs) for backlighting. CCFLs are able to produce better colors than EL-WLED and full-array WLED technologies, but consume a lot more energy and require an internal inverter.
True or False

A

True

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12
Q

-are the most common technology used by LCDs.
-have very good response times (1–5 ms) and refresh rates (60–144 Hz), so are great for PC gaming.

A

TN (twisted nematic) panels

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13
Q

TN panels have imperfect color reproduction because only six bits per color can be displayed. They mimic true 24-bit color using dithering and other techniques.
TN panels have poor viewing angles and contrast ratios.
True or False

A

True

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14
Q

-have the best color reproduction quality and viewing angles among LCDs, making them well suited for graphic artists, designers, and photographers.

A

IPS (In-plane switching) panels

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15
Q

IPS panels have relatively slow response times (5–16 ms) and refresh rates (60 Hz) and have a slight purple tint when viewed from a wide angle.
High-end IPS LCDs are very expensive (over $1000).
True or False

A

True

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16
Q

Because of how they draw frames, LCDs suffer from motion blur when fast movements occur on the display. While motion blur can be reduced with higher refresh rates and lower response times, it can’t be eliminated entirely.
True or False

A

True

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17
Q

which devices use LCD screens

A

HDTVs
Computer displays
Tablets
Smart phones
Mobile devices
Wearable technology

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18
Q

Display devices that are called LED monitors or LED TVs are simply LCDs that use LED backlighting.
True or False

A

True

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19
Q

-use millions of small cells that contain electrically charged ionized gases.
-When electrical current is applied to a plasma cell, the gas within the cell forms a plasma and emits a photon of light.
-Each pixel in a plasma display is made up of a red, green, and blue cell.
-As with OLED monitors, plasma monitors don’t require a backlight.

A

Plasma

20
Q

disadvantages:
-Plasma displays consume two to three times as much power as LCDs.
-They generate much more heat than other display types.
-The gasses inside the cells are sensitive to air pressure fluctuations.
-Plasma displays also suffer from a problem known as image retention (IR).
-Static images that are displayed for a long time cause the phosphors to overheat, which creates a temporary shadow of the image that is visible even when the display is turned off.
-If the static image was displayed for too long, screen burn-in can occur, and the shadow image will be permanent.
True or False

A

True

21
Q

Plasma displays smaller than 32 inches are not sold because manufacturing them is not profitable.
True or False

A

True

22
Q

use a thin layer of an organic compound (called an OLED) that lights up in response to an electrical current.

A

OLED displays

23
Q

OLED displays are more efficient, offer a wider viewing angle, and provide faster response times (< 0.01 ms). However, they are costly to manufacture; OLEDs are the most expensive type of display device. In addition, the pixels in OLEDs (the organic compound) wears out faster than the pixels in LED or plasma displays.
OLEDs can be used in any device that uses a flat-panel display. And because of their size, OLEDs can even be used in textiles (clothing and upholstery).
Flexible materials can be used to create OLED screens, resulting in a bendable—sometimes even foldable—screen. These types of OLEDs are called FOLEDs (flexible OLEDs).

A

Facts

24
Q

use a powerful light source (either an LED or laser diode) and a lens to project visual content onto a surface, which is typically a specialized screen.

A

Projectors

25
Q

use a small internal LCD screen to control light and create images.

A

LCD projectors

26
Q

are inexpensive and can be very compact; some can fit inside a pocket.

A

LCD projectors

27
Q

suffer from what is called the screen door effect. This is when each RGB pixel of the display is easily seen.

A

LCD projectors

28
Q

LCD projectors also suffer from motion blur due to the way liquid crystal technology functions.
True or False

A

True

29
Q

use a spinning color wheel to create RGB color and a DMD (digital micromirror device) to control light.

A

DLP projectors

30
Q

-DLP projectors are capable of very high-resolution output at even large projection sizes.
-DLP projectors are much more expensive than LCD projectors.
-DLP projectors are not as compact as LCD projectors and also use more energy and generate more heat.
True or False

A

True

31
Q

Projectors are affected by environmental factors, such as physical obstructions, ambient light, and the surface being projected onto. As such, projectors are only practical in controlled environments.
True or False

A

True

32
Q

shiny screen reflects light and reduces visibility

A

glare

33
Q

Display devices that use glass panels (such as plasma displays, OLED displays, and some LCDs) can suffer from a problem known as glare, where the shiny screen reflects light and reduces visibility. This is mostly a problem for mobile devices that are used outdoors. To reduce this effect, you can use anti-glare filters, which are made of a special non-reflective surface.

A

Facts

34
Q

which two display technologies require backlighting?

A

-LED
-LCD

35
Q

displays use white LEDs along one edge (usually the top) of the LCD and a light diffuser to backlight the screen.

A

Edge-lit white LED

36
Q

use an array of LEDs (light-emitting diodes) to backlight the screen.

A

Modern LCDs

37
Q

OLED monitors and plasma monitors do not require a backlight.

A

Facts

38
Q

displays use millions of small cells that contain electrically charged ionized gasses. The cells light up when electrically charged and do not need any backlighting

A

plasma

39
Q

small chip that contains millions of tiny mirrors that can redirect light inside of DLP projectors.

A

DMD

40
Q

what display setting allows the same content on your laptop monitor and the projection screen?

A

Duplicate these displays option

41
Q

what display setting allows you to have different content on the laptop monitor than that shown on the projection screen?

A

Extend these displays option

42
Q

what display setting allows user to limit the output to either the laptop monitor (1) or the projection screen (2), but not?

A

Show only on 1 and Show only on 2

43
Q

have the best color reproduction quality and viewing angles among LCDs.

A

LCD displays with IPS panels

44
Q

have imperfect color reproduction due to the fact that only 6 bits per color can be displayed.

A

TN panels

45
Q

use far less power and run much cooler than plasma displays.
They are more expensive than LCDs with TN panels, but are still more affordable than OLED displays.

A

LCDs with IPS panels

46
Q

LCD display with TN panel are more affordable and have faster response times than LCDs with IPS panels, use far less power than a plasma display, and are far more affordable than OLED displays.
True or False

A

True

47
Q

Plasma displays do have several advantages, including the fact that:
Plasma displays usually show colors more accurately than LCD displays.
Because no backlighting is used, plasma displays have high contrast and can produce true black (displays that use backlighting can only display very dark grey).
Plasma displays have almost no motion blur due to the speed of the gas reaction and the way they draw frames. Because of this, most plasma displays do not specify response times.

A

Facts

My Comptia A+ Studyguide (19 decks)

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