diff -r b3cce7791326 -r 9543e1703afb MiniDisplay/minidisplay.cpp
--- a/MiniDisplay/minidisplay.cpp	Wed May 28 10:20:32 2014 +0200
+++ b/MiniDisplay/minidisplay.cpp	Wed May 28 11:42:49 2014 +0200
@@ -108,8 +108,29 @@
             }
         }
 
-    iDisplay.Clear();
-    iDisplay.BitBlit(bits,w,h,0,0);
-    iDisplay.SwapBuffers();
+    if (iDisplay.IsOpen())
+    {
+        iDisplay.Clear();
+        iDisplay.BitBlit(bits,w,h,0,0);
+        iDisplay.SwapBuffers();
+    }
     //
 }
+
+
+QString MiniDisplay::vendor()
+{
+    return QString::fromWCharArray(iDisplay.Vendor());
+}
+
+QString MiniDisplay::product()
+{
+    return QString::fromWCharArray(iDisplay.Product());
+}
+
+QString MiniDisplay::serialNumber()
+{
+    return QString::fromWCharArray(iDisplay.SerialNumber());
+}
+
+