This question already has an answer here:
I was ripping off a Center 352 Infrared Thermometer. The basic functionality is to sense the temperature and display it on an LCD. The LCD turned out to have no interface to the controller. The PCB had 3 LEDs which were focused onto the LCD to provide backlight. Other than that there was no other active component(/connector) that can transmit the data to the LCD. How is this interface done?
I tried googling and tried searching for connectors/interfaces without electrical contact. But, I got no idea how it works.