What advantages does and external LCD Controller have over and embedded LCD Controller?
Embedded / internal LCD Controllers can be quite limiting with respect to display resolution, power down modes, color depths, available bandwidth and specialized features. They are typically included in a processor design as simply one of many peripherals and therefore no special care is taken in the design or feature set. Using an external LCD Controller is usually required to alleviate one of the above mentioned limitations. Higher resolutions are supported, overall system power can be reduced by allowing the processor to ‘sleep’ while the external LCD Controller maintains display refresh. Extensive display orientated features can be realized such as acceleration, windowing, higher color depths, simultaneous displays, etc.
