I found out you can enlarge the default displays from ISIS. Most displays in the lib are based on the T6963C chip so they can drive larger resolutions. By decomposing a default display of the lib. you dont have to start from scratch but can use all pinning and and simulation options from the T6963C. All you have to do now is create 2 new active symbols with the larger area. One for an active screen and one for an inactive screen.
Again easyest way is to pick the symbols used by the standard display f.i. LCD_128x128_0 and LCD_128x128_1 and decompose them aswell, make them the size you want and and make a new symbol. (mind the origin to be top left!).
You can also make the colours for ON and OFF state to your liking aswell
Obviously LCD_XXXXX_0 is for OFF..
In the properties of the component u can now set height and width to the new size and make a device.
I have tried this on the standard hitachi LM type display from the lib optoelectronics in ISIS.
Good luck piloteers...