diff --git a/gfxlcd/abstract/chip.py b/gfxlcd/abstract/chip.py
index 6e1eb64..8bbca39 100644
--- a/gfxlcd/abstract/chip.py
+++ b/gfxlcd/abstract/chip.py
@@ -85,7 +85,7 @@ class Chip(metaclass=abc.ABCMeta):
         pass
 
     @abc.abstractmethod
-    def draw_pixel(self, pos_x, pos_y):
+    def draw_pixel(self, pos_x, pos_y, color=None):
         """draw a pixel at x,y"""
         pass
 
diff --git a/gfxlcd/demos/nju_hd44780.py b/gfxlcd/demos/nju_hd44780.py
new file mode 100644
index 0000000..afb0b36
--- /dev/null
+++ b/gfxlcd/demos/nju_hd44780.py
@@ -0,0 +1,28 @@
+import sys
+sys.path.append("../../")
+import RPi.GPIO # NOQA pylint: disable=I0011,F0401
+from charlcd.buffered import CharLCD # NOQA
+from gfxlcd.driver.nju6450.gpio import GPIO
+from gfxlcd.driver.nju6450.nju6450 import NJU6450
+from gfxlcd.driver.hd44780 import HD44780
+RPi.GPIO.setmode(RPi.GPIO.BCM)
+
+
+def test1():
+    """demo """
+    lcd = NJU6450(122, 32, GPIO())
+
+    drv = HD44780(lcd, True)
+    print(drv.width, drv.height)
+    lcd = CharLCD(drv.width, drv.height, drv, 0, 0)
+    lcd.init()
+    lcd.write('First')
+
+    lcd.write('HD44780', 6, 3)
+    lcd.flush()
+    lcd.write('/* ', 12, 0)
+    lcd.write('|*|', 12, 1)
+    lcd.write(' */', 12, 2)
+    lcd.flush()
+
+test1()
diff --git a/gfxlcd/demos/ssd_hd44780.py b/gfxlcd/demos/ssd_hd44780.py
new file mode 100644
index 0000000..d64d365
--- /dev/null
+++ b/gfxlcd/demos/ssd_hd44780.py
@@ -0,0 +1,28 @@
+import sys
+sys.path.append("../../")
+import RPi.GPIO # NOQA pylint: disable=I0011,F0401
+from charlcd.buffered import CharLCD # NOQA
+from gfxlcd.driver.ssd1306.spi import SPI
+from gfxlcd.driver.ssd1306.ssd1306 import SSD1306
+from gfxlcd.driver.hd44780 import HD44780
+RPi.GPIO.setmode(RPi.GPIO.BCM)
+
+
+def test1():
+    """demo """
+    lcd = SSD1306(128, 64, SPI())
+
+    drv = HD44780(lcd, True)
+    print(drv.width, drv.height)
+    lcd = CharLCD(drv.width, drv.height, drv, 0, 0)
+    lcd.init()
+    lcd.write('First')
+
+    lcd.write('HD44780', 6, 3)
+    lcd.flush()
+    lcd.write('/* ', 12, 0)
+    lcd.write('|*|', 12, 1)
+    lcd.write(' */', 12, 2)
+    lcd.flush()
+
+test1()
diff --git a/gfxlcd/driver/hd44780.py b/gfxlcd/driver/hd44780.py
index 3386c1e..8f74075 100644
--- a/gfxlcd/driver/hd44780.py
+++ b/gfxlcd/driver/hd44780.py
@@ -2,15 +2,16 @@
 allows graphical LCD to work as character LCD
 """
 from charlcd.drivers.base import BaseDriver
-from charlcd.abstract import lcd as char_lcd
+from charlcd.abstract.flush_event_interface import FlushEvent
 
 
-class HD44780(BaseDriver):
-    def __init__(self, gfxlcd):
+class HD44780(BaseDriver, FlushEvent):
+    def __init__(self, gfxlcd, lcd_flush=False):
         """Class init"""
         self.gfxlcd = gfxlcd
         self.mode = 0
         self.initialized = False
+        self.lcd_flush = lcd_flush
         self.font = self.gfxlcd.options['font']
         self.width = self.gfxlcd.width // self.font.size[0]
         self.height = self.gfxlcd.height // self.font.size[1]
@@ -73,3 +74,11 @@ class HD44780(BaseDriver):
 
     def get_line_address(self, idx):
         return self.address[idx]
+
+    def pre_flush(self, buffer):
+        pass
+
+    def post_flush(self, buffer):
+        """called after flush()"""
+        if self.lcd_flush:
+            self.gfxlcd.flush(True)
diff --git a/gfxlcd/driver/nju6450/nju6450.py b/gfxlcd/driver/nju6450/nju6450.py
index 682f8ae..673e123 100644
--- a/gfxlcd/driver/nju6450/nju6450.py
+++ b/gfxlcd/driver/nju6450/nju6450.py
@@ -6,7 +6,7 @@ from gfxlcd.abstract.chip import Chip
 
 class NJU6450(Page, Chip):
     """Class for an LCD with NJU6450 chip"""
-    def __init__(self, width, height, driver, auto_flush=True):
+    def __init__(self, width, height, driver, auto_flush=False):
         Chip.__init__(self, width, height, driver, auto_flush)
         Page.__init__(self, driver)
         self.rotation = 0
@@ -62,7 +62,7 @@ class NJU6450(Page, Chip):
                     else:
                         self.driver.data(self.get_page_value(i, j), 1)
 
-    def draw_pixel(self, pos_x, pos_y):
+    def draw_pixel(self, pos_x, pos_y, color=None):
         """draw a pixel at x,y"""
         if self.rotation == 90:
             pos_x, pos_y = self.height - pos_y - 1, pos_x
@@ -70,7 +70,7 @@ class NJU6450(Page, Chip):
             pos_x, pos_y = self.width - pos_x - 1, self.height - pos_y - 1
         if self.rotation == 270:
             pos_x, pos_y = pos_y, self.width - pos_x - 1
-        Page.draw_pixel(self, pos_x, pos_y)
+        Page.draw_pixel(self, pos_x, pos_y, color)
 
     def fill_rect(self, pos_x1, pos_y1, pos_x2, pos_y2):
         """draw a filled rectangle"""
diff --git a/gfxlcd/driver/ssd1306/ssd1306.py b/gfxlcd/driver/ssd1306/ssd1306.py
index 2f3b8c4..fd5ffa8 100644
--- a/gfxlcd/driver/ssd1306/ssd1306.py
+++ b/gfxlcd/driver/ssd1306/ssd1306.py
@@ -24,7 +24,7 @@ class SSD1306(Page, Chip):
         }
     }
 
-    def __init__(self, width, height, driver, auto_flush=True):
+    def __init__(self, width, height, driver, auto_flush=False):
         Chip.__init__(self, width, height, driver, auto_flush)
         Page.__init__(self, driver)
         self.rotation = 0
@@ -107,8 +107,8 @@ class SSD1306(Page, Chip):
         self.driver.cmd(pos_x1)
         self.driver.cmd(pos_x2)
 
-    def draw_pixel(self, pos_x, pos_y):
+    def draw_pixel(self, pos_x, pos_y, color=None):
         """draw a pixel at x,y"""
         if self.rotation == 90 or self.rotation == 270:
             pos_x, pos_y = pos_y, pos_x
-        Page.draw_pixel(self, pos_x, pos_y)
+        Page.draw_pixel(self, pos_x, pos_y, color)