Control Systems Displays

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Extras Non Exam Control Systems

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There are two classes of display ...

Dot matrix:
These can display any shape you like at a resolution that only depends on the number of dots in the display.
Segmented:
These tend to be cheaper but can only show or hide the segments.
This restricts the shapes that can be displayed.
The commonest is the seven segment display for digits and a very few letter shapes.

There are three main types of display ...

Old school displays based on neon gas discharge tubes or conventional light bulbs are falling into disuse.

Display Type	LED Segments	LED Matrix	LCD Segments	LCD Matrix	OLED Segments	OLED Matrix
Current	10mA per LED.	10mA per LED. Up to 640 mA for one 8x8 matrix. A 15 letter display could drain 10 up to Amps!	Microamps	Microamps	Milliamps	Milliamps
Visibility	Poor in bright sunlight	Poor in bright sunlight	Need a backlight in the dark	Need a backlight in the dark	Poor in bright sunlight	Poor in bright sunlight
Response	Fast	Fast	Slow	Slow	Fast	Fast
Robustness	Good	Good	Delicate	Delicate	Delicate	Delicate
Cost	Cheap	More Expensive	Cheap	Cheap	More expensive	More expensive
Driver Needed	Binary to 7 Segment Decoder	Microcontroller and Driver Chip/s needed	Binary to 7 Segment Decoder or similar technology	Microcontroller and Driver Chip/s needed	Never seen these	Microcontroller and Driver Chip/s needed

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