T6963C with Arduino Mega 2560 Interfacing Issue.

Hi all,

Am trying to interface 240 x 128 Graphical display which have T6963C controller.
Am using u8glib library for interfacing. this is first time am interfacing with T6963c. so am trying to display
"Hello world " program from example program of u8glib librbary.

un commanded following lines and did connection as mentioned.

U8GLIB_T6963_240X128 u8g(8, 9, 10, 11, 4, 5, 6, 7, 14, 15, 17, 18, 16); // 8Bit Com: D0…D7: 8,9,10,11,4,5,6,7, cs=14, a0=15, wr=17, rd=18, reset=16

Unfortunately nothing is displaying on screen. i have adjusted Trimpot but then also there is no effect.

my connections as follows.

LCD PIN ------LCD NAME------U8glib------ Arduino2560
1 FG GND GND
2 GND GND GND
3 VDD 5V 5V
4 VO 10k POT
5 /WR wr 17
6 /RD rd 18
7 /CE cs 14
8 C/D a0 15
9 RST reset 16
10 D0 D0 8
11 D1 D1 9
12 D2 D2 10
13 D3 D3 11
14 D4 D4 4
15 D5 D5 5
16 D6 D6 6
17 D7 D7 7
18 FS GND GND
19 LEDA 5V ( Getting 4.9v from Display Module)
20 VEE 10k POT

10K pot connection
VEE ---- V0-----+5V

from vee am getting -23.8V
Attaching here the datasheet of GLCD.

What should i do next?

Kindly help…

RD240128A240.pdf (842 KB)

Wiring seems to be ok. By changing the trimpot wiper, are you able to make all pixel black? I mean, it should go from fully transparent to fully black. If this does not work, you will not be able to see something (even if the other parts work correctly )

Not really a problem, but your 10K pot connection could be also this:
VEE ---- V0----- GND

Oliver

thanks for reply.

As you said i adjusted trimpot wiper but screen back led brightness is not effecting.

Ok. i will re-wire as per ur suggestion. VEE---V0__GND

Should i increase pot value from 10k to 20k or 50k?

Manufacture of Display suggest that
a). Take care of VEE which generate -ve voltage (Around -15 v to -25v) am getting -23.8v. Means Display is Healthy.
b). Trimpot use 20k to avoid accidental low voltage to VEE pin which cause damage of Display.
c). Time delay should be match with controllers time delay at time of initialization. ( how to check and confirm this point)?

Anyway i will change the connection and try first. If it not works i will increase the trimpot value.

AT LEDA pin am getting 4.9V even if i not connected anywhere. So should i connect to 5v or leave the connection as free.?

--Nikhil

As you said i adjusted trimpot wiper but screen back led brightness is not effecting.

This is not related to the LED brightness, but instead the contrast of the LCD itself. In fact you should see the transparent/black change without background LED active, ambient light should do the job also.

Should i increase pot value from 10k to 20k or 50k?

10k is fine, 20k should be also ok, 50k might be a little bit too high.

Take care of VEE which generate -ve voltage (Around -15 v to -25v) am getting -23.8v. Means Display is Healthy.

It just means, that the voltage converter is ok.

AT LEDA pin am getting 4.9V even if i not connected anywhere. So should i connect to 5v or leave the connection as free.?

You should be able to see something on the LCD without backlight, so I suggest to postpone the backloght LED problem.

Oliver

Hi...

sorry for delay...

i tried this after long time. Now i changed wiring as per your suggestion. (VEE-----VO----GND).

And it Started Working :slight_smile: :slight_smile: :slight_smile:

now i can do as i want ......

Thanks alot for your support olikraus.....

Expecting your support in future also for Touch TFT Display.

Thanks again...

  • Nikhil