diff --git a/esp32s3/balance/main/gc9a01.c b/esp32s3/balance/main/gc9a01.c
index 8bbd4f9..5b7734e 100644
--- a/esp32s3/balance/main/gc9a01.c
+++ b/esp32s3/balance/main/gc9a01.c
@@ -192,7 +192,13 @@ void gc9a01_init(void)
 
     /* Backlight on */
     gpio_set_level(DISP_BL_GPIO, 1);
-    ESP_LOGI(TAG, "GC9A01 init OK");
+
+    /* Clear screen to black */
+    display_fill_rect(0, 0, 240, 240, 0x0000);
+
+    ESP_LOGI(TAG, "GC9A01 init OK: DC=%d CS=%d SCK=%d MOSI=%d RST=%d BL=%d",
+             DISP_DC_GPIO, DISP_CS_GPIO, DISP_SCK_GPIO, DISP_MOSI_GPIO,
+             DISP_RST_GPIO, DISP_BL_GPIO);
 }
 
 /* ── display_fill_rect ── */