diff --git a/sound_picture_app/Display_ST7789.cpp b/sound_picture_app/Display_ST7789.cpp
index 6f5c246..4e31c23 100644
--- a/sound_picture_app/Display_ST7789.cpp
+++ b/sound_picture_app/Display_ST7789.cpp
@@ -208,15 +208,15 @@ void LCD_addWindow(uint16_t Xstart, uint16_t Ystart, uint16_t Xend, uint16_t Yen
 void Backlight_Init(void)
 {
   pinMode(EXAMPLE_PIN_NUM_BK_LIGHT, OUTPUT);
-  digitalWrite(EXAMPLE_PIN_NUM_BK_LIGHT, HIGH); // Set backlight to full brightness
+  digitalWrite(EXAMPLE_PIN_NUM_BK_LIGHT, LOW); // Set backlight to full brightness (LOW for active-low)
 }
 
 void Set_Backlight(uint8_t Light)
 {
   pinMode(EXAMPLE_PIN_NUM_BK_LIGHT, OUTPUT);
   if (Light > 0) {
-    digitalWrite(EXAMPLE_PIN_NUM_BK_LIGHT, HIGH);
+    digitalWrite(EXAMPLE_PIN_NUM_BK_LIGHT, LOW); // ON (active-low)
   } else {
-    digitalWrite(EXAMPLE_PIN_NUM_BK_LIGHT, LOW);
+    digitalWrite(EXAMPLE_PIN_NUM_BK_LIGHT, HIGH); // OFF
   }
 }