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C library for driving a T6963C-based LCD screen from a Raspberry Pi

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Rasp-T6963C

C library for driving a T6963C-based LCD screen from a Raspberry Pi.

I successfully run it to control a DG-24128-01 Datavision LCD display, and control it from my Raspberry.

flow diagram

Flow diagram

As you can see, the T6963C need 3 separate power supplies :

  • +5V for logic
  • -15V for LCD (this power can easily be achieved from a +5V with the aid of a TL497 chip)
  • a 75V AC for the backlight. You'll need a CCFL for this, which cannot be powered from a +5V. In my case, I found you that could be driven with a +12V tension)

The T6963C needs at least 10 control data lines (12 is better, however, FNT and REV are optional and may be hard-wired)

To spare several GPIO outputs on the raspberry, I chose to use an HC595 shift register, which can generate 8 data lines from 3 coming from the raspberry :

HC595 wiring

Finally, here is the wiring schema for the T6963C.

T6963C wiring

Some inputs are hard-wired :

Pin Value Explanation
/RD (Read) 1 (=5V) We never set the display in READ mode
/WR (Write) 0 (=0V) For the same reason, the display is always in WRITE mode
RST (Reset) 1 (=5V) Attached to +5V through a capacitor/resistor network (100nF/10kΩ). See T6963C data sheet.

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C library for driving a T6963C-based LCD screen from a Raspberry Pi

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