diff --git a/lv_core/lv_disp.c b/lv_core/lv_disp.c
index 5c108cd1f..6017ba27c 100644
--- a/lv_core/lv_disp.c
+++ b/lv_core/lv_disp.c
@@ -52,6 +52,18 @@ void lv_disp_pop_from_inv_buf(lv_disp_t * disp, uint16_t num)
     else disp->inv_p -= num;
 }
 
+void lv_disp_assign_screen(lv_disp_t * disp, lv_obj_t * scr)
+{
+    lv_disp_t * old_disp = lv_scr_get_disp(scr);
+
+    if(old_disp == disp) {
+        LV_LOG_WARN("lv_disp_assign_screen: tried to assign to the same screen")
+        return;
+    }
+
+    lv_ll_chg_list(&old_disp->scr_ll, &disp->scr_ll, scr);
+}
+
 /**********************
  *   STATIC FUNCTIONS
  **********************/
diff --git a/lv_core/lv_disp.h b/lv_core/lv_disp.h
index aff3ce110..62690f551 100644
--- a/lv_core/lv_disp.h
+++ b/lv_core/lv_disp.h
@@ -14,6 +14,7 @@ extern "C" {
  *      INCLUDES
  *********************/
 #include "../lv_hal/lv_hal.h"
+#include "lv_obj.h"
 
 /*********************
  *      DEFINES
@@ -26,6 +27,7 @@ extern "C" {
 /**********************
  * GLOBAL PROTOTYPES
  **********************/
+void lv_disp_assign_screen(lv_disp_t * disp, lv_obj_t * scr);
 
 /**
  * Get the number of areas in the buffer
diff --git a/lv_core/lv_vdb.c b/lv_core/lv_vdb.c
index 6ab6a9243..12523b2a2 100644
--- a/lv_core/lv_vdb.c
+++ b/lv_core/lv_vdb.c
@@ -111,7 +111,7 @@ void lv_vdb_flush(void)
 
     /*Flush the rendered content to the display*/
     lv_disp_t * disp = lv_refr_get_disp_refreshing();
-    if(disp->driver.disp_flush) disp->driver.disp_flush(vdb_act->area.x1, vdb_act->area.y1, vdb_act->area.x2, vdb_act->area.y2, vdb_act->buf);
+    if(disp->driver.disp_flush) disp->driver.disp_flush(disp, &vdb_act->area, vdb_act->buf);
 
 
 #if LV_VDB_DOUBLE
diff --git a/lv_hal/lv_hal_disp.h b/lv_hal/lv_hal_disp.h
index dd1060640..6480824a2 100644
--- a/lv_hal/lv_hal_disp.h
+++ b/lv_hal/lv_hal_disp.h
@@ -33,6 +33,8 @@ extern "C" {
  *      TYPEDEFS
  **********************/
 
+struct _disp_t;
+
 /**
  * Display Driver structure to be registered by HAL
  */
@@ -42,7 +44,7 @@ typedef struct _disp_drv_t {
     lv_coord_t ver_res;
 
     /*Write the internal buffer (VDB) to the display. 'lv_flush_ready()' has to be called when finished*/
-    void (*disp_flush)(int32_t x1, int32_t y1, int32_t x2, int32_t y2, const lv_color_t * color_p);
+    void (*disp_flush)(struct _disp_t * disp, const lv_area_t * area, lv_color_t * color_p);
 
     /*Fill an area with a color on the display*/
     void (*disp_fill)(int32_t x1, int32_t y1, int32_t x2, int32_t y2, lv_color_t color);
@@ -68,15 +70,16 @@ typedef struct _disp_drv_t {
 struct _lv_obj_t;
 
 typedef struct _disp_t {
+    void * user_data;
     lv_disp_drv_t driver;
-    lv_area_t inv_areas[LV_INV_BUF_SIZE];
-    uint8_t inv_area_joined[LV_INV_BUF_SIZE];
-    uint16_t inv_p;
     lv_ll_t scr_ll;
     struct _lv_obj_t * act_scr;
     struct _lv_obj_t * top_layer;
     struct _lv_obj_t * sys_layer;
-    uint8_t orientation:2;
+    lv_area_t inv_areas[LV_INV_BUF_SIZE];
+    uint8_t inv_area_joined[LV_INV_BUF_SIZE];
+    uint16_t inv_p        :10;
+    uint16_t orientation  :2;
 } lv_disp_t;
 
 /**********************