Course 1 Week 2 Mobile Device Repair, Display Types

Question 1

What is RMA?

Answer 1

Return Merchandise Authorization

warranty (service agreement) between your org/company with device manufacturer on how to replace devices

Question 2

What should you do before sending out a device for repair?

Answer 2

Factory reset

Question 3

What are the top 2 technologies used in mobile displays?

Answer 3

1. LCD (Liquid crystal display)
2. LED (Light Emitting Diodes)

Question 4

What 2 things do LCD displays require? What is this called?

Answer 4

1. Backlighting (often by LEDs)
2. Polarizers to control path of backlight

Backlighting required = non-emissive/passive displays

Question 5

What is BLU? What does it require?

Answer 5

Backlighting Unit

requires extra space (makes LCD thicker)

Question 6

What are 3 common LCD display types for mobile devices?

Answer 6

1. In-Plane Switching (IPS)
2. Twisted Nematic (TN)
3. Vertical Alignment (VA)

Question 7

How do LCD displays work?

Answer 7

Crystals are aligned in a variety of patterns and manipulated with electricity

Question 8

What LCD display type is used for touch screens and high-end monitors?

Answer 8

In-Plane Switching (IPS)

Question 9

What is IPS glow?

Answer 9

Backlight is visible from side viewing angles

Question 10

What is IPS LCD display types used in? 2 things

Answer 10

touch screens
high-end monitors

Question 11

What is the most expensive LCD display type? Least expensive?

Answer 11

Most expensive = In-Plane Switching

Least Expensive = Twisted Nematic

Question 12

What is the best general purpose, mid-range performance LCD display type?

Answer 12

Vertical Alignment

Question 13

What are 3 common OLED display types?

Answer 13

1. Active Matrix Organic Light emitting diode (AMOLED)
2. Inorganic mini-LEDs (mLEDs)
3. Inorganic micro-LEDs

Question 14

How do OLED displays work?

Answer 14

electricity passed through diodes, diodes emit light using organic carbon based materials

Question 15

What are displays that convert electricity into light called?

Answer 15

emissive/active displays

Question 16

What does a cathode do?

Answer 16

Injects electrons

Question 17

What does an anode do?

Answer 17

Removes electrons

Question 18

How is an AMOLED display different from an OLED 2 things? What is it used in?

Answer 18

1. AMOLED uses active matrix tech with active capacitors arranged in a matrix with thin film transistors (TFTs)
2. Controls each individual pixel for rapid state changes like brightness, color
3. for higher end phones, monitors, touchscreen

(Active Matrix Organic Light Emitting Diode)

Question 19

What are TFTs?

Answer 19

Thin film transistors

Question 20

3 negatives for OLED and AMOLED?

Answer 20

1. prone to image retention and burn in
2. sensitive to light and moisture
3. blue LEDs degrade faster than other colors = color distortion

Question 21

What are 6 ways mLEDs are used? (Inorganic mini-LEDs)

Answer 21

1. LCD backlight in smartphones (limited by LCD tech in these devices)
2. public info displays
3. signage
4. vehicle displays (uLEDs also)
5. electronics
6. readable in sunlight

Question 22

How are uLEDs and OLEDs the same? Differ?

Answer 22

work the same way but individual uLED size is extremely small 15 micrometers

Question 23

How do mLEDs and OLEDs differ?

Answer 23

Work the same but individual LED size is smaller 60-60 micrometers

Question 24

What is an OLED?

Answer 24

Organic Light Emitting Diodes (OLED)