diff --git a/Makefile b/Makefile
index 05ede9e..7ba3c5d 100644
--- a/Makefile
+++ b/Makefile
@@ -10,7 +10,7 @@ OBJS +=
 OBJS += basic/basic.o
 OBJS += eeprom/eeprom.o
 OBJS += reinvoke_isp.o
-LIBS += core/libcore.a lcd/libfont.a modules/libmodules.a
+LIBS += core/libcore.a lcd/liblcd.a modules/libmodules.a
 
 ##########################################################################
 # GNU GCC compiler flags
@@ -29,7 +29,7 @@ OBJS += $(TARGET)_handlers.o LPC1xxx_startup.o
 LDLIBS  = -lm
 LDLIBS += -Lmodules -lmodules
 LDLIBS += -Lcore -lcore
-LDLIBS += -Llcd -lfont
+LDLIBS += -Llcd -llcd
 OCFLAGS = --strip-unneeded
 
 LD_PATH = lpc1xxx
@@ -44,7 +44,7 @@ all: firmware
 core/libcore.a: core/projectconfig.h
 	cd core && $(MAKE) ROOT_PATH=../$(ROOT_PATH)
 
-lcd/libfont.a lcd/render.o lcd/display.o:
+lcd/liblcd.a lcd/render.o lcd/display.o:
 	cd lcd && $(MAKE) ROOT_PATH=../$(ROOT_PATH)
 
 modules/libmodules.a:
@@ -76,5 +76,5 @@ clean:
 	@cd modules && $(MAKE) clean
 
 
-.PHONY: lcd/libfont.a modules/libmodules.a
+.PHONY: lcd/liblcd.a modules/libmodules.a
 
diff --git a/lcd/display.c b/lcd/display.c
index 75b2a36..0328dc5 100644
--- a/lcd/display.c
+++ b/lcd/display.c
@@ -30,6 +30,7 @@ void delayms(uint32_t ms)
 /**************************************************************************/
 
 uint8_t lcdBuffer[RESX*RESY_B];
+int inverted = 0;
 
 /*
 //TODO FIXME why doenst that work ?
@@ -160,7 +161,16 @@ void lcdDisplay(uint32_t shift)
     uint16_t i,page;
     for(page=0; page<RESY_B;page++) {
         for(i=0; i<RESX; i++) {
-            lcdWrite(1,lcdBuffer[page*RESX+((i+shift)%RESX)]);
+            if (inverted) {
+                lcdWrite(1,~lcdBuffer[page*RESX+((i+shift)%RESX)]);
+            } else {
+                lcdWrite(1,lcdBuffer[page*RESX+((i+shift)%RESX)]);
+            }
         }
     }
 }
+
+void lcdInvert(void) {
+    inverted = ~inverted;
+}
+
diff --git a/lcd/display.h b/lcd/display.h
index a76c733..9d98e15 100644
--- a/lcd/display.h
+++ b/lcd/display.h
@@ -22,5 +22,6 @@ void lcdRead(uint8_t data);
 void lcdInit(void);
 void lcdFill(char f);
 void lcdDisplay(uint32_t shift);
+void lcdInvert(void);
 
 #endif
diff --git a/modules/bsx.c b/modules/bsx.c
index afaf097..bcd4488 100644
--- a/modules/bsx.c
+++ b/modules/bsx.c
@@ -32,20 +32,25 @@ void module_bsx(void) {
             brightness++;
             if (brightness > 100) brightness = 100;
             backlightSetBrightness(brightness);
-        };
+        }
 
         if(gpioGetValue(RB_BTN0)==0){
             brightness--;
             if (brightness > 100) brightness = 0;
             backlightSetBrightness(brightness);
-        };
+        }
+
+        if (gpioGetValue(RB_BTN3) == 0) {
+            while(gpioGetValue(RB_BTN3)==0);
+            lcdInvert();
+        }
 
         if (gpioGetValue(RB_BTN4)==0) {
             while(gpioGetValue(RB_BTN4)==0);
             DoString(0,8,"Enter ISP!");
             lcdDisplay(0);
             ReinvokeISP();
-        };
+        }
 
         dx = DoString(0, yctr, "Bright:");
         dx = DoInt(dx, yctr, brightness);
@@ -72,3 +77,4 @@ void module_bsx(void) {
 
     return;
 }
+