Fix image problem with 1Bit images

lib/obp60task/OBP60Extensions.h

@@ -147,6 +147,34 @@ LGFX & getdisplay();
 #define PAGE_UPDATE 1      // page wants display to update
 #define PAGE_HIBERNATE 2   // page wants displey to hibernate
 
+// Draw monochrome bitmap on both E-Ink and TFT displays
+// Konvertiert 1-Bit Bilder automatisch zu RGB565 für Farbdisplays
+inline void drawMonochromeBitmap(
+    int16_t x, int16_t y, 
+    const uint8_t *bitmap,
+    int16_t w, int16_t h,
+    uint16_t color) {
+    
+    #ifdef DISPLAY_ST7796
+    // Für RGB565 TFT: Konvertierung von 1-Bit zu Pixel-Zeichnung
+    for (int row = 0; row < h; row++) {
+        for (int col = 0; col < w; col++) {
+            int byteIdx = (row * ((w + 7) / 8)) + (col / 8);
+            int bitIdx = col % 8;
+            uint8_t byte = bitmap[byteIdx];
+            
+            // LSB-first format (Adafruit standard)
+            if (byte & (1 << bitIdx)) {
+                getdisplay().drawPixel(x + col, y + row, color);
+            }
+        }
+    }
+    #else
+    // Für E-Ink Displays: direkt drawBitmap verwenden
+    getdisplay().drawBitmap(x, y, bitmap, w, h, color);
+    #endif
+}
+
 // Display wrapper functions for E-Ink/TFT compatibility
 inline void displayFirstPage() {
     #ifdef DISPLAY_ST7796

lib/obp60task/obp60task.cpp

@@ -397,7 +397,7 @@ void OBP60Task(GwApi *api){
     displayNextPage();                            // Fast Refresh
     if(String(displaymode) == "Logo + QR Code" || String(displaymode) == "Logo"){
         getdisplay().fillScreen(commonData.bgcolor);
-        getdisplay().drawBitmap(0, 0, gImage_Logo_OBP_400x300_sw, getdisplay().width(), getdisplay().height(), commonData.fgcolor); // Draw start logo
+        drawMonochromeBitmap(0, 0, gImage_Logo_OBP_400x300_sw, getdisplay().width(), getdisplay().height(), commonData.fgcolor); // Draw start logo
         displayNextPage();                 // Fast Refresh
         displayNextPage();                 // Fast Refresh
         delay(SHOW_TIME);                        // Logo show time