Subsection 11 Electronic Displays Flashcards
‘Submarining’ is caused by the inability of some LCD screens to?
Respond to fast moving images on screen
A ‘Starburst’ LED has a minimum of?
14 segments
Beam deflection on EFIS displays are?
Electromagnetic
A circular waveform is produced by?
2 AC voltages out of phase by 90 degrees
A colour LCD which is backlit has?
3 colours
A colour LCD which is back lit is constructed of pixels, each of which has?
3 subpixels
A CRT display has the advantage oover an LCD display of a?
Large viewing angle
A digital meter LCD display has?
One segment at a time
A dot matrix/LED construction is
5x9 or a 4x7 rolling end display
A liquid crystal display has?
The advantage over a CRT
A segment type LED display usually comprises of?
Seven individual LED’s
A segmented configuration for the display of alphanumerical data requires?
16 segments to display the full range of capital letters and numerals
A seven segment display is used to display?
Octal and decimal numbers only
A shadow masks CRT works by one layer of RED,GREEN and BLUE dot matrix excited by?
Their own electrode guns
An LCD display has?
Three colours
An LCD display uses what type of power supply?
Continuous AC
An LED central warning panel on an aircraft has the advantage over a conventional filament bulb type central warning panel in that they are?
Lower maintenance and lower power consumption
An LED display is?
Monochrome only
An LED will emit light when it is?
Forward biased
At low ambient temperatures an LCD screen is?
Slower to update as data changes
Colour CRT shadow mask screen resolution is?
84 triads
CRT horizontal beam control is achieved by a?
Sawtooth Wave
EADI sky and ground display is provided by?
Raster scan
Electronic CRT beam display is used typically in?
Weather radar indicators
How are alphanumerical displays produced on a CRT?
By stroke pulse
How are colours produced on an active matrix LCD (AMLCD)?
By controlling the intensity of the tri-colour emitters in each pixel
If a magnetic field is parallel to the X plates in a CRT, which way will the beam move?
Horizontally
If the magnetic deflection coils produce a magnetic field which is parallel to the horizontal then the trace is deflected in the?
Vertical Axis
In a colour cathode ray tube, how is the phospher arranged arranged in the tube?
A single phospher layer containing Red, Green and Blue
In a CRT if the magnetic field is parallel to the Y plates, what will be the direction of the electron beam movement?
Vertical
In an ES CRT the focus is controlled by an?
Electrostatic field between the Anodes
Intensity of a CRT is controlled by varying the grid voltage with respect to the?
Cathode voltage
LED’s can give?
Monochrome displays only
LCD screens are driven by?
AC volage
Magnetic deflection in a CRT is achieved by a?
Trapezoidal waveform
Primary colours of a CRT are?
RED,GREEN and BLUE
Regarding CRT monitors the brilliance of a colour CRT compared to a Monochrome CRT is?
LOWER
The deflecting waveform supplied to the plates of an electrostatic display is a?
Ramp wave
The inside of a CRT consists of a?
Phospher coating and rare mercury gas
The most common CRT control for an EFIS system screen is a?
Combined system
The release of a photon by another photon is the principle of?
An LED
The shorter lead near the flat portion of an LED is?
The cathode
The supply to an LCD is?
AC
The sweep waveform used on a electromagnetic CRT is?
Trapezoidal
The timebase in a CRT consists of ?
An amplifier and an oscillator
The trace of an oscilloscope begins when the input level is approximately 10 volts but the peak values indicate 20 volts. What can be done to cause the trace to begin at zero volts?
Adjust the trigger level to zero volts trigger
To deflect the beam of a CRT horizontally, coils are placed on the neck of the tube?
Top and bottom
To display a circle on a CRT you use 2 sine waves?
90 degrees out of phase
What are the advantages of an LCD display over an LED?
Uses less current
What are the effects of the X and Y plates on a CRT?
Y plates move the beam vertically, X plates move the beam horizontally
What controls the image on the screen of a cathode ray tube?
Symbol generators
What creates the raster effect on a CRT?
Sawtooth frequency
What frequency creates the raster effect on a CRT?
50/60 Hz
What shape does the waveform take to counter the impedance effect of the coils in an electromagnetic controlled CRT?
Trapezoid
Which of the following electronic displays are commonly used in aircraft?
Cathode ray tube and light emitting diodes
