JHCTech ALAD-K2120T(P) User Manual page 49

 LCD Panel Type
Select the LCD panel type.
 LCD Panel Color Depth
Select the LCD panel color depth: 18 bit, 24 bit, 36 bit, and 48 bit.

Dimming Control
Select Dimming Type PWM/DC mode for LCD.
Figure 3.6 Boot display
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User's Manual