The maximum display resolution is limited by the LCD controller, the CPU bandwidth, the buffers, and the external bus speeds, as well as the panel size, the color depth and the refresh rates. Use the LCD Controller Bandwidth calculator on LPCware.com to determine your LCD parameters.
LPC247x bus bandwidth calculator:
http://www.lpcware.com/content/nxpfile/lpc247x-lcd-bus-load-calculator
LPC178x and LPC40xx bus bandwidth calculator:
http://www.lpcware.com/content/nxpfile/lcd-bus-bandwidth-calculator-lpc1...
LPC18xx and LPC43xx bus bandwidth calculator:
http://www.lpcware.com/content/nxpfile/lcd-bandwidth-calculator-lpc18xx-...
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