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CompTIA A+ 1101 (Core 1)_ > 1.2 Compare & contrast the display components of mobile devices > Flashcards

1.2 Compare & contrast the display components of mobile devices Flashcards

1
Q

2 common types of displays used in mobile devices?

A
  • LCD
  • OLED
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2
Q

Meaning of LCD?

A

Liquid Crystal Display

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3
Q

Meaning of IPS?

A

In-Plane Switching

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4
Q

Meaning of TN?

A

Twisted Nematic

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5
Q

Meaning of VA?

A

Vertical Alignment

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6
Q

Meaning of OLED?

A

Organic Light-Emitting Diode

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7
Q

What do LCD pixels consist of?

A

Subpixels with their own transistor to control its intensity

This creates the display’s color range

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8
Q

Meaning of TFT?

A

Thin Film Transistor

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9
Q

3 main types of LCD TFT technology?

TFT technology is a type of LCD technology that uses thin-film transistors to improve image quality and performance

A
  • TN
  • IPS
  • VA
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10
Q

How do TN TFTs work?

A

Uses crystals that twist or untwist

It twists/untwists in response to the voltage level

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11
Q

Advantage of TN TFTs?

A

Faster response times

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12
Q

What does fast response times help reduce?

A

Ghosting & motions trails in high frame rate input

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13
Q

What is refresh rate?

A

Speed at which the whole image is redrawn

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14
Q

What is refresh rate measured in?

A

Hertz (Hz)

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15
Q

What should the refresh rate be a multiple of?

A

Video frame rate

i.e. if a vid has a framerate of 30fps, its ideal for the display to have a refresh rate of 60Hz (30fps * 2 = 60Hz). This synchronization helps ensure smoother & more consistent motion on the screen, reducing issues like stuttering or tearing

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16
Q

What is response time?

A

The time taken for a pixel to change color

17
Q

what is response time measured in?

A

Milliseconds (ms)

18
Q

How do IPS TFTs work?

A

Using crystals that rotate

19
Q

Main benefit of IPS TFTs?

A

Better color reproduction at wider viewing angles

20
Q

What type of LCD is best for gaming & graphics/design work?

A

IPS

21
Q

How do VA TFTs work?

A

Using crystals that tilt

22
Q

Main benefits of VA TFTs?

A

Has a wide color gamut & best contrast-ratio performance

i.e. where a high-end IPS panel might support a 1200:1 contrast ratio, a VA panel would be 2000:1 or 3000:1

23
Q

What is contrast ratio?

A

Difference in shade between black & white pixels

24
Q

Main drawback of VA LCDs?

A

Viewing angles are worse than IPS & response times are worse than TN

This makes a VA panel more prone to motion blur & ghosting

25
Q

What are modern TFT LCDs illuminated by?

A

LED backlight

26
Q

What type of LED arrangement is used on most phone/tablet screens?

A

Edge lighting arrangement

The LEDs are positioned at the screen’s edges, with a diffuser ensuring uniform brightness.

27
Q

What backlight did older laptops use?

A

CCFL

28
Q

Meaning of CCFL?

A

Cold Cathode Fluorescent

29
Q

What power do CCFL bulbs require?

A

AC power

30
Q

Why do CCFL-backlit laptops need an inverter?

Inverter
A

To convert DC power to AC power

31
Q

How do OLEDs work?

A

Each pixel has its own LED, requiring no backlight

32
Q

4 benefits of OLED displays?

A
  • Better contrast ratios
  • Thinner
  • Lighter
  • Consumes less power
33
Q

Which display type can be curved to different shapes?

A

OLED

34
Q

2 main drawbacks for OLEDs?

A
  • Lower brightness than LCDs
  • More susceptible to burn-in
35
Q

What is a burn-in?

A

When LEDs retain an image due to displaying a static image for many hours

36
Q

Purpose of digitizers/touchscreens?

A

Converts analog input to digital instructions

37
Q

What kind of digitizers do modern mobile devices use?

A

Capacitive digitizers

38
Q

What do capacitive digitizers support?

A

Multitouch

gestures like “pinching” the screen can be interpreted as events & responded to by software in a particular way

39
Q

What does airplane mode do?

A

Disables some/all wireless features

Cellular data, Wi-Fi, GPS, Bluetooth, & NFC

On some devices, some services can be selectively re-enabled while still in airplane mode

CompTIA A+ 1101 (Core 1)_ (28 decks)

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