Liquid Crystal Displays MCQ’s

Digital Circuits Electronics & Communication Engineering

This set of Digital Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Liquid Crystal Displays”.

1. LCDs operate from a voltage ranges from ___________
a) 3 to 15V
b) 10 to 15V
c) 10V
d) 5V

2. By which properties, the orientation of molecules in a layer of liquid crystals can be changed?
a) Magnetic field
b) Electric field
c) Electromagnetic field
d) Gallois field

3. What is the backplane in LCD?
a) The ac voltage applied between segment and a common element
b) The dc voltage applied between segment and a common element
c) The amount of power consumed
d) For adjusting the intensity of the LCD

4. LCDs operate from a frequency ranges from ___________
a) 10Hz to 60Hz
b) 50Hz to 70Hz
c) 30Hz to 60Hz
d) None of the Mentioned

5. The first LCDs became commercially available in ___________
a) 1950s
b) 1980s
c) 1960s
d) 1970s

6. The full form of LCD is ____________
a) Liquid Crystal Display
b) Liquid Crystalline Display
c) Logical Crystal Display
d) Logical Crystalline Display

7. Electro-optical effect is produced in ___________
a) LED
b) LCD
c) OFC
d) OLED

8. In 7 segment display, how many LEDs are used?
a) 8
b) 7
c) 10
d) 9

9. The direction of electric field in an LCD is determined by ___________
a) the molecule’s chemical structure
b) Crystalline surface structure
c) Molecular Orbital Theory
d) Quantum Cellular Automata

10. The optical properties of liquid crystals depend on the direction of ___________
a) Air
b) Solid
c) Light
d) Water

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