There are two LCD shutter adapters, which carry or generate the control signal for the LCD shutter glasses. There is the RF modulator, which modulates the NTSC video onto a television channel, and finally the VGA converter, which converts the NTSC video format to VGA format for display on a VGA monitor.
TV adapter
This adapter consists of a DB-25 female connector, two short pieces of stranded wire, a DC power connector (same as the one used on AC-DC adapters – see the parts list below) and optional DB-25 backshell.
These are devices that use vertical sync (or generate a signal like it) to create the alternating left/right signal to turn each LCD shutter panel on and off. Shutter glasses such as the ones used in this project have a small circuit that generates an AC signal that powers the LCD panels in the glasses. This circuit resides in a small adapter, which has three connectors: power jack, stereo audio jack, and a DB-25 parallel port connector. The stereo audio connector carries the AC signal to each panel. The DB-25 connector usually mates to the DB-25 female connector on the rear of a PC or laptop. The shutter adapters described here will present a signal to a DB-25 connector on pin 4, which is where the shutter circuit expects to find it.
wiring diagram for LM-JC53-22NTM laptop LCD digital
The VGA adapter circuit board provides three functions: vertical sync extraction from composite video, vertical sync source selection, and shutter control circuit.
The two RCA jacks make the normal connection between the radio receiver and the RF modulator, as well as make the video signal available so the vertical sync can be extracted. Likewise, the two DB-15 connectors provide a place to tap into the VGA signal path so the vertical sync can be available for the shutter control. Without these pairs of connectors, it would be necessary to fabricate special breakout cables with tiny surface mount printed circuit boards mounted inside the connector housings. I tried it, and it was messy.
These are devices that use vertical sync (or generate a signal like it) to create the alternating left/right signal to turn each LCD shutter panel on and off. Shutter glasses such as the ones used in this project have a small circuit that generates an AC signal that powers the LCD panels in the glasses.
VGA Adapter Module
The VGA adapter generates the LCD shutter control signal directly from the video signal for those applications where the camera module is somewhere at the end of a radio link.
When the video is going to be displayed on a television set, the output of the radio receiver is connected to one of the RCA jacks on the VGA adapter. The video is sampled as it then travels to the RF modulator to be modulated onto channel 3 or 4, and used to generate vertical sync.
When the video is being displayed on a VGA monitor, the radio receiver output is first sent to a VGA converter. This device converts the composite video signal from the cameras into separate red, green and blue signals, and horizontal and vertical sync. The output of the VGA converter is sent to the VGA adapter by one of the 15-pin connectors, where the vertical sync is sampled as the VGA signals continue on to the monitor.
wiring diagram for LM-JC53-22NTM laptop LCD
