The project consist two configurations: "Debug TLS8204 Display" and "Debug PCD8544 Display". They are made due to release of a new revision of the display. Old one (PCD8544) is much brighter so with it you need higher contrast value. This is the only difference between the two configurations - the initial contrast:
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#if   defined  (TLS8204)
#define CONTRAST        0x5A
#elif defined  (PCD8544)
#define CONTRAST        0x7F
#endif
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If the pixels on your display are too dark you have TLS8204 display and high contrast value. Switch to "Debug TLS8204 Display" configuration.
If the pixels on your display are too bright or you can't even see the pixels you have PCD8544 display and low contrast value. Switch to "Debug PCD8544 Display" configuration.
