Active 3D glasses
There are several 3D technologies on the market. Some TVs require active glasses (which require battery special electronic-ware), some TVs have passive, simpler glasses. Active glasses are capable of displaying full hd (1080p) resolution to both eye where passive glasses split up the resolution and provide 540p to single eye.
30% lighter design
More HDMI ports
LG 42LM669S has 1.0000 more extra HDMI ports. HDMI cables are used to transfer both image and sound data to the TV. More ports are useful for external devices such as DVD/Blu-ray players, game consoles, sattelite receivers etc.
Much less power consumption
Around 43% less power consumption per hour (40 Watt difference). It is better for your pocket and environment.
Approximately 10% bigger screen
You can watch a second channel in a little popup at the corner of the screen
Built in wifi
You can surf the internet with your tv by connecting the network wirelessly
Wired internet connection
You can plug and surf the internet with a ethernet cable
With DLNA supported mobile phones, computers and tablets, you can show your pictures and videos on the screen
Very high refresh rate
Local dimming is the process of switching off appropriate lights at the back of the screen which is managed smartly by the TV itself regarding to the brightness and contrast of the scene. For example, with local dimming you can see the burning section of a lit candle (on a black background) sharper because black areas will not be backlit.