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i am using an electrolite 162A lcd interfaced on an arm7 lpc2148 board . For the lcd to work do we require any drivers to be loaded or just a firmware programming is enough similar to 8051
With smaller embedded platforms, you normally don't need a driver, since you normally don't have an operating system that hides the hardware.
In this case, you need to write the code that communicates with the display, or google for suitable code to incorporate into your program.
The LCD neither knows nor cares how you choose to structure your software - all that matters is that it provides the correct signals, with the correct timing.
Similarly, the ARM7 CPU neither knows nor cares anything about your source code: all it does is execute instructions in sequence.
So, if you want to structure your code into "layers" with a "driver" below and an "application" above - that's entirely up to you!