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CompTIA A+ 1101 (Core 1) (In Progress) > 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 is a liquid crystal?

A

Compound whose properties change with the application of voltage

Color LCD pixels consist of subpixels with RGB filters, each addressed by a transistor to control intensity, creating the display’s color range.

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8
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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9
Q

What are liquid crystal elements & transistors placed in a flat panel display?

A

TFT

Such LCD panels are often referred to as “TFTs”

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10
Q

Meaning of TFT?

A

Thin Film Transistor

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11
Q

3 main types of LCD TFT technology?

A
  • TN
  • IPS
  • VA
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12
Q

How do TN TFTs work?

A

Using crystals that twist or untwist in response to the voltage level

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13
Q

Advantage of TN TFTs?

A

Faster response times that other TFT technologies

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14
Q

What does fast response times help reduce?

A

Ghosting & motion trails with high frame rate input

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15
Q

What is refresh rate?

A

Speed at which the whole image is redrawn

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16
Q

What is refresh rate measured in?

A

Hertz (Hz)

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17
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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18
Q

What is response time?

A

The time taken for a pixel to change color

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19
Q

what is response time measured in?

A

Milliseconds (ms)

20
Q

How do IPS TFTs work?

A

Using crystals that rotate

21
Q

Main benefit of IPS TFTs?

A

Better color reproduction at a wider range of viewing angles

22
Q

What viewing angles do most IPS panels support

A

178/178° horizontal & vertical viewing angles

23
Q

Main drawback of early/cheaper IPS displays?

A

Worse response times than TN displays

24
Q

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

A

High-quality IPS display

25
Q

How do VA TFTs work?

A

Using crystals that tilt

26
Q

Main benefits of VA TFTs?

A

Supports a wide color gamut & the 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

27
Q

What is contrast ratio?

A

Difference in shade between black & white pixels

28
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

29
Q

What are modern TFT LCDs illuminated by?

A

LED backlight

30
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.

31
Q

What backlight did older laptops use?

A

CCFL

32
Q

Meaning of CCFL?

A

Cold Cathode Fluorescent

33
Q

What power do CCFL bulbs require?

A

AC power

34
Q

Why do CCFL-backlit laptops need an inverter?

Inverter
A

To convert MOBO DC power to AC power

MOBO = Motherboard

35
Q

How do OLEDs work?

A

Each pixel has its own LED, so no backlight is required

36
Q

4 benefits of OLED displays?

A
  • Better contrast ratios
  • Thinner
  • Lighter
  • Consumes less power
37
Q

Which display type can be curved to different shapes?

A

OLED

38
Q

2 main drawbacks for OLEDs?

A
  • Lower brightness than LCDs
  • More susceptible to burn-in
39
Q

What is a burn-in?

A

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

40
Q

Purpose of digitizers/touchscreens?

A

Converts analog input to digital instructions

41
Q

What are digitizers sandwiched between?

A

Protected glass & display panel

42
Q

What kind of digitizers do modern mobile devices use?

A

Capacitive digitizers

43
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

44
Q

What do accelerometers & gyroscopes in mobile devices do?

A

Detects device movement & adjusts screen orientation

This also serves as a control mechanism (e.g., tablet as steering wheel in driving games).

45
Q

What does airplane mode do?

A

Disables some or 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

46
Q

Where are the Wi-Fi & cellular antennas placed on mobile devices?

A

Around the display screen

CompTIA A+ 1101 (Core 1) (In Progress) (20 decks)

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