LCD-High Definition designed for outdoor close to medium proximity digital display advertising.
LED is designed for Large format digital HD display advertising.
In outdoor advertising, LED technology is successfully used for large format Static site displays (i.e. long range viewing). An LED screen features fewer, larger and, often brighter, pixels. Some examples of large format LED are the large digital billboards now replacing the traditional paper print roadside bill boards, and the large format displays around football pitches that are seen on TV.
Because LED technology features fewer larger pixels, small low resolution displays of this type are limited to simple images or ticker tape text.