PLT ALLEGES LACK OF SIGNAGE FOR RWY 13 HOLD LINE AT OSH.

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I WAS AT THE N T HANGARS AT OSH. I LISTENED TO ATIS AND EXPECTED TO TAXI TO RWY 18 FOR DEP (AS ADVISED BY THE ATIS). HOWEVER; GND TOLD ME TO TAXI TO RWY 13 INSTEAD (APPARENTLY THE WINDS HAD CHANGED). I HAVE NEVER USED RWY 13 FOR DEP AND I WAS NOT SURE WHERE THE HOLD SHORT LINE WAS. I TAXIED S ON TXWY B1 TO RWY 09-27. RWY 13 INTERSECTS 09-27 AT THAT POINT SO I EXPECTED TO SEE A RWY SIGN AND A HOLD SHORT LINE. I SAW A SIGN FOR RWY 09-27 BUT THERE WAS NO SIGN FOR RWY 13-31. I CROSSED RWY 09-27 TO THE END OF RWY 13 AND STOPPED. WHEN I CALLED THE TWR; THE CTLR INFORMED ME THAT I SHOULD HAVE HELD AT THE HOLD SHORT LINE PRIOR TO CROSSING RWY 09-27. I ACKNOWLEDGED THE MISTAKE AND DEPARTED. AFTER LNDG I TAXIED PAST THE HOLD SHORT POINT ON TXWY B1 AND AGAIN NOTICED THE SIGN FOR RWY 09-27. ON THE OTHER SIDE OF THE TXWY THERE WAS ANOTHER SIGN; BUT THERE WERE NO LETTERS OR NUMBERS ON IT. I PRESUME THAT SIGN SHOULD HAVE SAID RWY 13-31 IN RED NUMBERS; BUT THERE WERE NO NUMBERS ON THE SIGN. I REALIZED THAT I MADE A MISTAKE; BUT I FEEL THE MISSING RWY SIGN CONTRIBUTED TO MY CONFUSION REGARDING WHERE TO HOLD SHORT OF RWY 13. THERE WERE NO CONFLICTS WITH OTHER ACFT; JUST A VERBAL REPRIMAND FROM THE CTLR.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR WAS GIVEN A CLRNC TO TAXI TO RWY 13 VIA TXWY B1. AFTER CROSSING RWY 09-27 HE FOUND HIMSELF ON RWY 13. THE RPTR STATED THAT A SIGN AT THE RWY 09-27 HOLD LINE INDICATING THAT IT SHOULD BE USED ALSO AS THE RWY 13 HOLD LINE WOULD BE HELPFUL.