diff --git a/core/embed/trezorhal/stm32f4/display/stm32f429i-disc1/display_driver.c b/core/embed/trezorhal/stm32f4/display/stm32f429i-disc1/display_driver.c
index b488d2dba..5c6c84f70 100644
--- a/core/embed/trezorhal/stm32f4/display/stm32f429i-disc1/display_driver.c
+++ b/core/embed/trezorhal/stm32f4/display/stm32f429i-disc1/display_driver.c
@@ -133,6 +133,16 @@ void display_copy_rgb565(const gl_bitblt_t *bb) {
   gl_rgb565_copy_rgb565(&bb_new);
 }
 
+void display_copy_mono1p(const gl_bitblt_t *bb) {
+  display_driver_t *drv = &g_display_driver;
+
+  gl_bitblt_t bb_new = *bb;
+  bb_new.dst_row = drv->framebuf + (DISPLAY_RESX * bb_new.dst_y);
+  bb_new.dst_stride = DISPLAY_RESX * sizeof(uint16_t);
+
+  gl_rgba8565_copy_mono1p(&bb_new);
+}
+
 void display_copy_mono4(const gl_bitblt_t *bb) {
   display_driver_t *drv = &g_display_driver;
 
diff --git a/core/embed/trezorhal/xdisplay.h b/core/embed/trezorhal/xdisplay.h
index f1619b0e9..53cfb54e4 100644
--- a/core/embed/trezorhal/xdisplay.h
+++ b/core/embed/trezorhal/xdisplay.h
@@ -129,13 +129,17 @@ void display_set_compatible_settings(void);
 //
 // bb->dst_row and bb->dst_stride must be 0
 
-// Fills a rectangle with a solid color
+// Fills a rectangle with a solid color.
+// This function is supported by all types of displays.
 void display_fill(const gl_bitblt_t *bb);
-// Copies an RGB565 bitmap
+// Copies an RGB565 bitmap.
+// This function is supported by RGB displays only.
 void display_copy_rgb565(const gl_bitblt_t *bb);
-// Copies a MONO4 bitmap
+// Copies a MONO4 bitmap (supported only with RGB displays).
+// This function is supported by RGB displays only.
 void display_copy_mono4(const gl_bitblt_t *bb);
-// Copies a MONO1P bitmap
+// Copies a MONO1P bitmap.
+// This function is supported by all types of displays.
 void display_copy_mono1p(const gl_bitblt_t *bb);
 
 #ifdef TREZOR_EMULATOR