diff --git a/examples/lvgl_ssd1306/lv_conf.h b/examples/lvgl_ssd1306/lv_conf.h
index b19875a..48235dd 100644
--- a/examples/lvgl_ssd1306/lv_conf.h
+++ b/examples/lvgl_ssd1306/lv_conf.h
@@ -38,8 +38,8 @@
  * Required for buffered drawing, opacity and anti-aliasing
  * VDB makes the double buffering, you don't need to deal with it!
  * Typical size: ~1/10 screen */
-#define LV_VDB_SIZE         (0 * LV_HOR_RES)  /*Size of VDB in pixel count (1/10 screen size is good for first)*/
-#define LV_VDB_PX_BPP       LV_COLOR_SIZE     /*Bit-per-pixel of VDB. Useful for monochrome or non-standard color format displays. (Set `disp_drv->vdb_wr` and `disp_drv->vdb_rd` too)*/
+#define LV_VDB_SIZE         (LV_VER_RES * LV_HOR_RES / 2)  /*Size of VDB in pixel count (1/10 screen size is good for first)*/
+#define LV_VDB_PX_BPP       1     /*Bit-per-pixel of VDB. Useful for monochrome or non-standard color format displays. (Set `disp_drv->vdb_wr` and `disp_drv->vdb_rd` too)*/
 #define LV_VDB_ADR          0                 /*Place VDB to a specific address (e.g. in external RAM) (0: allocate automatically into RAM; LV_VDB_ADR_INV: to replace it later with `lv_vdb_set_adr()`)*/
 
 /* Use two Virtual Display buffers (VDB) parallelize rendering and flushing (optional)
@@ -67,7 +67,7 @@
 #define LV_INDEV_LONG_PRESS_REP_TIME    100                    /*Repeated trigger period in long press [ms] */
 
 /*Color settings*/
-#define LV_COLOR_DEPTH     16                     /*Color depth: 1/8/16/32*/
+#define LV_COLOR_DEPTH     1                     /*Color depth: 1/8/16/32*/
 #define LV_COLOR_16_SWAP   0                      /*Swap the 2 bytes of RGB565 color. Useful if the display has a 8 bit interface (e.g. SPI)*/
 #define LV_COLOR_SCREEN_TRANSP        0           /*1: Enable screen transparency. Useful for OSD or other overlapping GUIs. Requires ARGB8888 colors*/
 #define LV_COLOR_TRANSP    LV_COLOR_LIME          /*Images pixels with this color will not be drawn (with chroma keying)*/
diff --git a/examples/lvgl_ssd1306/main.c b/examples/lvgl_ssd1306/main.c
index d2e655b..8ebd57e 100644
--- a/examples/lvgl_ssd1306/main.c
+++ b/examples/lvgl_ssd1306/main.c
@@ -63,30 +63,45 @@ static void ssd1306_task(void *pvParameters)
     vTaskDelay(SECOND);
     ssd1306_set_whole_display_lighting(&dev, false);
 
+    //Set a style for the obj
+    lv_style_copy(&style, &lv_style_transp);
+    style.text.font = &lv_font_dejavu_10;   /*Unicode and symbol fonts already assigned by the library*/
+    style.text.color.full = 1;
+    style.text.opa = 255;
+
+    style.body.main_color.full = 0;
+    style.body.grad_color.full = 0;
+    style.body.shadow.color.full = 0;
+    style.body.border.color.full = 0;
+    style.body.empty = 1;
+
+    style.image.color.full = 1;
+    style.image.intense = 255;
+    style.image.opa = 255;
+
+    style.line.color.full = 1;
+    style.line.opa = 255;
+    style.line.width = 1;
+    style.line.rounded = false;
+
     //Create main screen obj
     lv_obj_t * scr = lv_obj_create(NULL, NULL);
     lv_scr_load(scr);
+    lv_obj_set_style(scr, &style);
 
     //Create a simple label
     label = lv_label_create(lv_scr_act(), NULL);
+    lv_obj_set_style(label, &style);
+
     lv_obj_align(label, lv_scr_act(), LV_ALIGN_IN_TOP_LEFT, 0, 0);
     lv_label_set_long_mode(label, LV_LABEL_LONG_BREAK);
     lv_label_set_align(label, LV_LABEL_ALIGN_CENTER);
     lv_label_set_text(label, "lvgl work with esp-open-rtos");
     lv_obj_set_width(label, LV_HOR_RES);
 
-    //Set a style for the obj
-    lv_style_copy(&style, &lv_style_plain);
-    style.text.font = &lv_font_dejavu_10;   /*Unicode and symbol fonts already assigned by the library*/
-    lv_label_set_style(label, &style);
-
     while (1) {
         /*draw system call */
         lv_task_handler();
-        if(ssd1306_need_redraw())
-        {
-            ssd1306_load_frame_buffer(&dev);
-        }
         vTaskDelay(1);
     }
 }
@@ -174,6 +189,7 @@ void user_init(void)
         printf("%s: failed to init SSD1306 lcd\n", __func__);
         vTaskDelay(SECOND);
     }
+
     ssd1306_set_whole_display_lighting(&dev, true);
 
     /*inverse screen (180°) */
@@ -186,12 +202,13 @@ void user_init(void)
     lv_disp_drv_init(&disp_drv);
     /*Set up the functions to access to your display*/
     disp_drv.disp_flush = ssd1306_flush; /*Used in buffered mode (LV_VDB_SIZE != 0  in lv_conf.h)*/
-    disp_drv.disp_fill = ssd1306_fill;//ex_disp_fill;   /*Used in unbuffered mode (LV_VDB_SIZE == 0  in lv_conf.h)*/
-    disp_drv.disp_map = ssd1306_map;//ex_disp_map;    /*Used in unbuffered mode (LV_VDB_SIZE == 0  in lv_conf.h)*/
+    disp_drv.disp_fill = NULL;//ex_disp_fill;   /*Used in unbuffered mode (LV_VDB_SIZE == 0  in lv_conf.h)*/
+    disp_drv.disp_map = NULL;//ex_disp_map;    /*Used in unbuffered mode (LV_VDB_SIZE == 0  in lv_conf.h)*/
+    disp_drv.vdb_wr = ssd1306_vdb_wr;
     lv_disp_drv_register(&disp_drv);
 
     /* Create user interface task */
-    xTaskCreate(ssd1306_task, "ssd1306_task", 256, NULL, 2, NULL);
+    xTaskCreate(ssd1306_task, "ssd1306_task", 512, NULL, 2, NULL);
 
     font_timer_handle = xTimerCreate("font_timer", 5 * SECOND, pdTRUE, NULL, font_timer);
     xTimerStart(font_timer_handle, 0);
diff --git a/lvgl/lv_drivers b/lvgl/lv_drivers
index eafd24d..8fe0804 160000
--- a/lvgl/lv_drivers
+++ b/lvgl/lv_drivers
@@ -1 +1 @@
-Subproject commit eafd24d14e3c914b870e9575e5ec33d06280d313
+Subproject commit 8fe0804ceb875193a37106a2e25d07c106650a86