The LCD uses the Philips PCD8544 chip, it is compatible with the 3310 LCD. Here is a link of the PCD8544 datasheet -
http://www.nxp.com/acrobat/datasheets/PCD8544_1.pdf. Accessing individual pixel on the LCD is a bit tricky, because the LCD control chip is organized in 84 x 6 bytes (= 84 x 48 pixels). Therefore a local buffer is needed for pixel read/write, and updating the LCD. I am in a process of developing the graphic library (most of the code is working). Will publish the code as soon as I can ;D