Is there an eBook reader compatible Tripitaka? I would like to know if there exist a PDF version of Tripitaka which is compatible with an eBook reader(Kindle, Kobo alike)?
I am presuming you are looking for translations. There is the Buddha Jayanthi edition which has both Sinhala and Pali.

English


http://dharmafarer.org/ - does not have all the Tripitaka but there is a growing number of Suttas in PDF form
http://www.accesstoinsight.org/ - this has traslation by many and can be downladed in multiple formats in mulitple languages


Multi languages


https://suttacentral.net/ - no PDF but mobile friendly. But has translations in multiple languages


Pali


http://www.tipitaka.org/ - Pali text is many different scripts with PDF downloads


Sinhala (Since you name sounds like a Sinhalese name including including some in Singhala script)


http://www.aathaapi.org/Thripitaka.html - Buddha Jayanthi in PDF
http://metta.lk/tipitaka/, http://pitaka.lk/ -  A.P. de Soyza's translations (https://www.facebook.com/pitaka.lk has links to PDFs)
http://www.thripitakaya.org/ - Unicode mobile friendly format.