12-8) Display Driving Circuit - Samsung RB215BSSB Service Manual

OPERATION PRINCIPLES BY PARTS OF CIRCUIT

12-8) DISPLAY DRIVING CIRCUIT

1) KEY SCAN &DISPLAY DRIVING PRINCIPLE
As shown in the wave diagram below,Micom sends out "high "signals through the MICOM 6
terminals of NO #1→2→3→4→5→6 for 2ms each every 12ms.This signal goes to output terminal
via input terminal of IC51 (TD62783AP or KID65783AP). Here, the peak to peak voltage of the
square wave is 11~12V DC and each output wave is as follows.
V
GRID #1
GRID #2
GRID #3
GRID #4
GRID #5
GRID #6
10msec
2msec
51
T