VX1828B
Preliminary Datasheet
Video Processor for Middle Size LCD Panel
P.17/P.64
V1.0 050420
5.7 BLACK-LEVEL EXTENSION (BLE)
Basic idea of black level extension is to enhance the contrast of the luminance in the dark potion of the
picture. The advantage of this function is to make the object more solid, apparent, and noticeable to
the viewers. The BLE function works adaptively, depending on the average luminance of the picture.
The Luminance transform function for BLE is controlled by three parameters, BKXLVL, BKXMAX, and
BKXSLP (
Figure 5.2
).
Input
Luminance
Output Luminance
BKXMAX - The Maximum
Location for Adaptive
Turnaround Point
BKXSLP - The Slope of The
Transform Function in BLE
Section
Linear Section
Black Section
BLE
Section
Adaptive
Turnaround Point
Depending on
Video Content
Figure 5.2 BLE Transform Function
