This is what i have seen on http://www.powertip.com.tw
- Your display does not have the original T6963 chip but a (hopefully) compatible SAP1024B
- There seems to be no negative power converter
For testing i suggest to use an external power source. Batteries could be fine also. I have used a power supply with variable voltage output for my display during testing phase:
On the picture the battery drives the backlight. The external power supply provides the negative voltage. The red and black "Clamping hooks" provide the -15V for the contrast of my display. Note, that the red (+15V) cable of the power supply is connected to GND of the display. The black clamp (white cable) is connected to the contrast input. The Arduino is powered by a laptop which runs on battery power. To avoid conflicts with your 220/110 AC powered devices, do use only one device powered from 220/110 AC.
Meanwhile i have replaced the power supply by a negative converting module (AM2D-0515DZ)
Please note that your display might require less then 15 volt.