Subelement D: Display & Control Systems - 10 Key Topics – 10 Exam Questions— Topic 29: Displays
Question 8-29D4
Element 8 (RADAR)LCD patterns are formed when:
Explanation
LCDs (Liquid Crystal Displays) operate by harnessing the unique properties of liquid crystals. When an electric field, created by applying voltage (and thus current) across specific segments or pixels, is introduced, the rod-shaped liquid crystal molecules align themselves. This alignment changes how light passes through the crystal and polarizing filters, either blocking it or allowing it through. By selectively controlling these fields across an array of pixels, visible patterns, images, and text are formed.
Option B describes raster scan displays, which are characteristic of older Cathode Ray Tube (CRT) technology, not LCDs. Reducing voltage generally dims a display rather than forming patterns. Option C, involving deflection coils and resonance, also pertains to CRTs, where coils steer an electron beam. Option D, concerning an antenna's bearing, is completely unrelated to display technology.
Related Questions
8-29D2 Voltages used in CRT anode circuits are in what range of value?8-29D3 The purpose of the aquadag coating on the CRT is:8-29D5 In a raster-type display, the electron beam is scanned:8-29D6 Select the statement, which is most correct regarding a raster scan display.8-2A1 A radio wave will travel a distance of three nautical miles in: