LCDDEN controls the timing of data transfer to the LCD panel, while LCDDISP controls the activation of the entire display.
LCDDEN is typically used to enable the data transfer from the LCD controller to the LCD panel. It indicates to the LCD panel that valid data is present on the data lines and should be latched or sampled. LCDDEN is often used to synchronize the transfer of pixel data to the display.
LCDDISP is used to enable the entire display. When LCDDISP is active, the LCD panel is turned on, and pixels can be displayed. This signal controls the overall activation of the display, allowing it to show content.