T6963

[olikraus]

Originally reported on Google Code with ID 328

Hi,

I´m usin a WG240128B lcd with T6963 chip. I connect de lcd to an arduino mega2560 and
arduino soft 1.6.1 like in the proyect.

when power on de lcd flash once and nothing more.
The proyect compile wheel. 

The lcd don´t have pins A0 and CS, have C/D(comand/data read/write) and CE (chip enable).
I conect A0 like CE and CS like C/D.

Please help.

Reported by goosze on 2015-03-12 17:05:37

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• Attachment: wg240128b.pdf

[olikraus]

You have to connect A0 to the C/D line.
Will this help?

Reported by olikraus on 2015-03-15 11:07:41

[olikraus]

Hi,

I try it but it doesn´t work. I think the problem is negated signals such as reset.
I think in your library are not negated.

If you can take a look to this pdf, you'll probably find a clue.

Thank you for all.

Reported by goosze on 2015-04-02 14:01:30

[olikraus]

A0 must be connected to c/d
CS must be connected to chip enable

What exactly is your u8glib constructor? What are the arguments to this constructor?
Who did you connect the pins, which are given on the constructor?

Reported by olikraus on 2015-04-03 07:38:02

[pivo88]

Hi guys, I'd like to reanimate this issue somehow. I'm playing around now with Arduino Leonardo and my old-one JM12864B (128x64) LCD display with T6963C controller. I've opened "Hello World" example, configured pinout and u8glib constructor, compiled and upload and nothing just happened.

I made a connection by wireing like this:

You can find My LCD display Spec here: http://www.jm.pl/karty/JM12864BSPEC.pdf or here: https://kentec.net/pdf/lcd/12864b.pdf

u8glib constructor: //U8GLIB_T6963_128X64 u8g(D0, D1, D2, D3, D4, D5, D6, D7, cs, a0, wr, rd, reset); U8GLIB_T6963_128X64 u8g( 6, 7, 8, 9, 10, 11, 12, 13, 3, 4, 1, 2, 5);

FS pin is connected to GND. I'm not sure what should I do with pin 4 Vee...

Compilation goes fine, upload aswell but the display stays blank.

Do you have any idea what goes wrong?

Edit: D7 signal is connected to pin13 on Arduino so I can see the "L" diode on Arduino PCB and it is blinking. When I disconnected Reset from pin 5 and put directly to GND, then L-diode stops blinking and stays off and also display shows one horizontal line in random row.

[pivo88]

Ok, sorry I didn't notice u8g is not supported any more and there is new u8g2. But I've made also a try and it still doesn't work :(

[olikraus]

The U8g2 constructor is different. You must connect Rd to 5v, if I remember correctly. See also the U8g2 FAQ.

Vee usually requires -10v but this depends on your board also.

[pivo88]

The U8g2 constructor is different. You must connect Rd to 5v, if I remember correctly. See also the U8g2 FAQ.

Yes, I noticed that :) I've adapted constructor to U8g2 version and connected RD to +5V, but this is not the case this time. later in the evening I will try to use another Breadboard and will make connection again.

[jakubtrzpiot]

Were you able to make it work? I have the same problem. I know you posted 5 years ago but if you could share your solution I'd be grateful.

[olikraus]

U8g2 supports the T6963 without problems

[jakubtrzpiot]

My display is POWERTIP PG-12864F I'm new to electronics and I wasn't able to make it work though I wired everything according to my displays documentation I found online and used this constructor: U8G2_T6963_128X64_1_8080 u8g2(U8G2_R0, 8, 9, 10, 11, 4, 5, 6, 7, /enable=/ 17, /cs=/ 14, /dc=/ 15, /reset=/ 16); // Connect RD with +5V, FS0 and FS1 with GND. I'd appreciate if you could just point me in the right direction. Thanks!

[pivo88]

Hi there, I didn't develop my project any more after that and didn't solve the problem. Maybe I'll come back to this as I'm still having both Arduino and LCD ;)

All the best in your development!

[olikraus]

Did you add some negative voltage to v0?

[jakubtrzpiot]

@pivo88 Hi and thanks for replying! Too bad you had to abandon your project :( but I hope you'll be able to make it work some day.

[jakubtrzpiot]

@olikraus No, I didn't was I supposed to? I thought I only had to use negative voltage for the backlight. Should I use the inverter output to change the contrast with a pot?

[jakubtrzpiot]

Excuse my lack of competence in electronics. I have V0 connected to the potentiometer with +5V and GND. I've also used the wrong term in the previous comment (I thought an inverter inverts voltage from +5 to -5 but in actuality, it goes DC to AC which is used for the EL backlight in my display). I'll try to get my hands on a charge pump to produce negative voltage for the V0 pin and see how it goes. Thanks for your help and for creating this awesome library!

[olikraus]

... the negative voltage is required for the LCD itself

[jakubtrzpiot]

I used some old printer power supply that has -12V rail and now I can actually adjust the contrast. I still have the same problem as op where the text isn't displayed on the screen but when I connect the reset pin to the ground I get a single horizontal line that moves down each time I put the pin to ground. (I suspect it has something to do with the refresh rate?)

[jakubtrzpiot]

Nothing I tried made any difference so I switched to a display with KS0108 controller and everything worked right away with u8g2 lib!

[olikraus]

hmmm