Hi Gi Choi,
By checking on your TV's specifications, it seems like the Intel(R) WiDi feature comes with it, and you would not need an extra adapter to connect, however, we would suggest getting in contact with LG* support line to verify the information.
Here's the information I was able to see directly from LG* support site:
LM6700 Series Product Information
NOTE: This links is being offered for your convenience and should not be viewed as an endorsement by Intel of the content, products, or services offered there.
Now, just make sure that the following system requirements are met on the laptop side:
Intel® Wireless Display
System requirements for the Intel® Wireless Display
I have a Dell Vostro Laptop that meets all the hardware and software requirements for WiDi and I have been trying for the past 2 days to connect it to an LG 55LM7600 TV. They find each other but can never connect successfully.
Each time I try to connect, I see the 'Connecting' message on the laptop as well as the TV and after a minute, they both just display the not connected message.
After the connection fails, Intel WiDi on the laptop still displays the TV as an available adapter but when I try again to connect, I see a message stating: 'This application has an issue. Please close and restart application'. When I restart the application, it still doesn't work. Power cycling all devices including the router has not helped either.
I would truly appreciate any suggestions to get my WiDi working successfully.