diff --git a/waveshare2in13v2/controller.go b/waveshare2in13v2/controller.go
index f7827e7..2af1568 100644
--- a/waveshare2in13v2/controller.go
+++ b/waveshare2in13v2/controller.go
@@ -78,8 +78,15 @@ func configDisplayMode(ctrl controller, mode PartialUpdate, lut LUT) {
 }
 
 func updateDisplay(ctrl controller, mode PartialUpdate) {
+	var displayUpdateFlags byte
+
+	if mode == Partial {
+		// Make use of red buffer
+		displayUpdateFlags = 0b1000_0000
+	}
+
 	ctrl.sendCommand(displayUpdateControl1)
-	ctrl.sendData([]byte{0})
+	ctrl.sendData([]byte{displayUpdateFlags})
 
 	ctrl.sendCommand(displayUpdateControl2)
 	ctrl.sendData([]byte{0xC7})
diff --git a/waveshare2in13v2/controller_test.go b/waveshare2in13v2/controller_test.go
index 45d8ede..c536ea7 100644
--- a/waveshare2in13v2/controller_test.go
+++ b/waveshare2in13v2/controller_test.go
@@ -138,7 +138,7 @@ func TestUpdateDisplay(t *testing.T) {
 			name: "partial",
 			mode: Partial,
 			want: []record{
-				{cmd: displayUpdateControl1, data: []byte{0}},
+				{cmd: displayUpdateControl1, data: []byte{0x80}},
 				{cmd: displayUpdateControl2, data: []byte{0xc7}},
 				{cmd: masterActivation},
 			},
diff --git a/waveshare2in13v2/waveshare213v2.go b/waveshare2in13v2/waveshare213v2.go
index d119960..c3d68a1 100644
--- a/waveshare2in13v2/waveshare213v2.go
+++ b/waveshare2in13v2/waveshare213v2.go
@@ -239,30 +239,10 @@ func (d *Dev) Bounds() image.Rectangle {
 	return image.Rect(0, 0, d.opts.Width, d.opts.Height)
 }
 
-// Draw draws the given image to the display.
+// Draw draws the given image to the display. Only the destination area is
+// uploaded. Depending on the update mode the whole display or the destination
+// area is refreshed.
 func (d *Dev) Draw(dstRect image.Rectangle, src image.Image, srcPts image.Point) error {
-	opts := drawOpts{
-		cmd:     writeRAMBW,
-		devSize: image.Pt(d.opts.Width, d.opts.Height),
-		buffer:  d.buffer,
-		dstRect: dstRect,
-		src:     src,
-		srcPts:  srcPts,
-	}
-
-	eh := errorHandler{d: *d}
-
-	drawImage(&eh, &opts)
-
-	if eh.err == nil {
-		updateDisplay(&eh, d.mode)
-	}
-
-	return eh.err
-}
-
-// DrawPartial draws the given image to the display. Display will update only changed pixel.
-func (d *Dev) DrawPartial(dstRect image.Rectangle, src image.Image, srcPts image.Point) error {
 	opts := drawOpts{
 		devSize: image.Pt(d.opts.Width, d.opts.Height),
 		buffer:  d.buffer,
@@ -273,6 +253,7 @@ func (d *Dev) DrawPartial(dstRect image.Rectangle, src image.Image, srcPts image
 
 	eh := errorHandler{d: *d}
 
+	// Keep the two buffers in sync.
 	for _, cmd := range []byte{writeRAMBW, writeRAMRed} {
 		opts.cmd = cmd
 
@@ -290,6 +271,13 @@ func (d *Dev) DrawPartial(dstRect image.Rectangle, src image.Image, srcPts image
 	return eh.err
 }
 
+// DrawPartial draws the given image to the display.
+//
+// Deprecated: Use Draw instead. DrawPartial merely forwards all calls.
+func (d *Dev) DrawPartial(dstRect image.Rectangle, src image.Image, srcPts image.Point) error {
+	return d.Draw(dstRect, src, srcPts)
+}
+
 // Halt clears the display.
 func (d *Dev) Halt() error {
 	return d.Clear(image1bit.On)