Display types

From Helpful
Jump to: navigation, search

Backlit flat-panel displays

There are roughly two parts of such monitors you can care about: How the backlight works, and how the pixels work.


CCFL or LED backlight

LCD/TFT/similar

Self-lit

OLED

QLED

On image persistence / burn-in

VFD

VFD.jpg

Vacuum Fluorescent Displays (VFDs) are vacuum tubes applied in a specific way


Lighting

Nixie tubes

Nixie2.gif


Mechanical

Mechanical counter

https://en.wikipedia.org/wiki/Mechanical_counter

Split-flap

Split-flap diagram.png

https://en.wikipedia.org/wiki/Split-flap_display

DIY

LCD character dislays

The idea is the same, the interface different - character displays are basically those with predefined (and occasionally rewritable) fonts.


Classical interface

The more barebones interface is often a 16 pin line with a pinout like

  • Ground
  • Vcc
  • Contrast
usually there's a (trim)pot from Vcc, or a resistor if it's fixed


  • RS: Register Select (character or instruction)
in instruction mode, it receives commands like 'clear display', 'move cursor',
in character mode,
  • RW: Read/Write
tied to ground is write, which is usually the only thing you do
  • ENable / clk (for writing)
  • 8 data lines, but you can do most things over 4 of them


  • backlight Vcc
  • Backlight gnd


So minimal setup is:

  • tie RW to ground
  • tie RS, EN, D7, D6, D5, and D4 to digital outs


I2C and other

Matrix dislays

Small LCDs

These are sometimes called OLED, for reasons I don't yet understand.