Panasonic TC-L42D30, Technical Manual, Page: 42 / 80

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TC-L37DT30 Eyewear Control Signal
The circuit that handles 3D processing of the LCD TV is located inside the LCD panel. Neither a
block diagram nor a schematic diagram is available for the basic understanding of the 3D
operation. The one thing that is known is that the eyewear sync signal, developed inside the LCD
panel, is output to the A board via pin 42 of the LVDS connector (A15). On the A-Board, it enters
IC5901 where it is used as a reference to create the signal needed to synchronize the 3D
glasses. The output signal of IC5901 is provided to the LEDs of the V-Board for infrared
transmission to the eyewear.
To turn on the IR transmitter, IC8000 outputs the 3D_LED_ON command to trigger the DC/DC
converter IC5900 into outputting LED_DVR5V.