Light Emitting Diode Displays

• Single
• Matrix
  • TIL305
• Lasers +

Pulsing LEDs for effeciency, brighter appearance and multiplexed display

Thermal issues with high power LEDs

Driving 8 or 9 7 segment displays with 8 or 9 io pins (and no extra circuitry)

Driving 12 LEDs with 4 uController pins

Driving 20 LEDs with 4 uController pins

Driving multiple bicolor LEDs in a matrix from and embedded controller

I see surface mount LEDs (Panasonic LNJ208R8ARA in DigiKey) that are 0.8 mm wide, and could end-stack on about 1 mm centers. (.04 inches?) Harold

PIC - LED interfacing

SX - LED interfacing

A discussion on wearable, head mounted LED displays

Area lighting with LED lightbulbs

Interfacing to people@

See also:

• https://www.youtube.com/watch?v=Th-u84OkpeQ A 38 segment display with abilities to display some Asian characters.+
• https://hackaday.io/page/21308-the-7-segment-decoder-done-wrong 4 bit to 7 segment decoder (digits only) with fewer components bynot using binary. E.g. the 4 bit values are selected to reduce complexity. Using diodes for OR and transistor inverters makes for a very tiny circuit. Input bits are w, x, y, z.

  wxyz digit
  ---- -----
  1101 0
  0000 1
  1011 2
  1010 3
  0100 4
  0110 5
  0111 6
  1000 7
  1111 8
  1110 9
  

  And the outputs are described by this logic:

  a = x | z
  b = x | ~z
  c = y | ~w
  d = z | w
  e = w
  f = y
  g = ~(x | ~y) | z
  

  +
• https://cpldcpu.wordpress.com/2015/05/24/plexingplus/ Charlieplexing plus... 6 LEDs from 2 io pins? !! Wow.+
• http://avtanski.net/projects/timer Using 7-segment LED indicators for a PIC-microcontroller-based countdown timer.+
• http://avtanski.net/projects/led/ Gallery of 7-segment LED images - for project documentation/description purposes, website design, etc.+
• http://www.rubicon-es2.com/ Rubicon Technology Inc is a company to watch for advances in LED technology
• John Paysons PICList post on Moving message displays
• HP-GLT Plot files of the layout and a picture of a 7-seg LED Digits Module developed and produced for a digital clock with the digit on one side and a 74HC164 SMD shift register on the other side. It's very small and has 6 contacts.
  • 2 for power supply.
  • 1 for data input of the shift register
  • 1 for data output of the shift register
  • 1 clock
  • and 1 for the common pole of the LED digit.
• http://www.allegromicro.com/control/prodsel1.htm
• http://www.ti.com/dlp
• http://www.dse.co.nz
• http://www.dse.com.au
• http://www.jaycar.com.au

PICList post "How to matrix bicolor LEDs?"

Archive:

• List post ": White LED lifetime issues." Also interesting info about color from "White" LEDs +
• PICList post "LED Matrix" Matrix 5x7 fonts with a 3to8 decoder and 8 byte tables +
• PICList post "loads of flashing LEDs" +
• PICList post "loads of flashing LEDs" +
• PICList post "different approach to keyboard scanning?" +

LCD Front Panel Set: 2x16 LCD w/HD44780 controller, 4 push buttons, 3 LEDs and a 2x12 pin header. +

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