Advantech IPPC-9151G User Manual page 59

3. Select "Display" as shown below:
4. Drag the slider with the mouse or click Up/Down button to adjust the brightness
of LVDS display.

Note! For IPPC-9151G, the lower the slider is, the brighter LVDS display
will be.

For IPPC-9171G, the lower the slider is, the darker LVDS display
will be.
51 IPPC-9151G/9171G User Manual