diff --git a/main/APP/app_task_display/app_task_display.c b/main/APP/app_task_display/app_task_display.c
index 72d3ca6..00cb5b0 100644
--- a/main/APP/app_task_display/app_task_display.c
+++ b/main/APP/app_task_display/app_task_display.c
@@ -28,6 +28,8 @@
 #include "CST816T.h"
 #include "lv_conf.h"
 #include "lvgl.h"
+#include "driver/gpio.h"
+#include <stdio.h>
 
 #define LV_TICK_PERIOD_MS 1
 
@@ -76,7 +78,7 @@ static void cst_scan_gesture()
         if (index++ == 500) {
             index = 0;
             if (app_display_handle.back_light_auto_off) {
-                if (!app_display_handle.back_light_state) {
+                if (app_display_handle.back_light_state) {
                     lcdBacklightOff(&lcd_disp_dev);
                     app_display_handle.back_light_state = 0;
                 }
@@ -84,6 +86,7 @@ static void cst_scan_gesture()
         }
 
         if (cst816t_available()) {
+            index = 0;
             release_timeout = 5;
             /*printf("gesture.id %u \n", data.gestureID);
             printf("points %u \n", data.points);
@@ -143,6 +146,93 @@ static void _display_thread_entry()
     }
 }
 
+
+static void scroll_event_cb(lv_event_t * e)
+{
+    lv_obj_t * cont = lv_event_get_target(e);
+
+    lv_area_t cont_a;
+    lv_obj_get_coords(cont, &cont_a);
+    lv_coord_t cont_y_center = cont_a.y1 + lv_area_get_height(&cont_a) / 2;
+
+    lv_coord_t r = lv_obj_get_height(cont) * 7 / 10;
+    uint32_t i;
+    uint32_t child_cnt = lv_obj_get_child_cnt(cont);
+    for(i = 0; i < child_cnt; i++) {
+        lv_obj_t * child = lv_obj_get_child(cont, i);
+        lv_area_t child_a;
+        lv_obj_get_coords(child, &child_a);
+
+        lv_coord_t child_y_center = child_a.y1 + lv_area_get_height(&child_a) / 2;
+
+        lv_coord_t diff_y = child_y_center - cont_y_center;
+        diff_y = LV_ABS(diff_y);
+
+        /*Get the x of diff_y on a circle.*/
+        lv_coord_t x;
+        /*If diff_y is out of the circle use the last point of the circle (the radius)*/
+        if(diff_y >= r) {
+            x = r;
+        } else {
+            /*Use Pythagoras theorem to get x from radius and y*/
+            uint32_t x_sqr = r * r - diff_y * diff_y;
+            lv_sqrt_res_t res;
+            lv_sqrt(x_sqr, &res, 0x8000);   /*Use lvgl's built in sqrt root function*/
+            x = r - res.i;
+        }
+
+        /*Translate the item by the calculated X coordinate*/
+        lv_obj_set_style_translate_x(child, x, 0);
+        if (x <= 4) {
+            lv_obj_set_style_bg_color(child, lv_color_hex(0xff0000), LV_PART_MAIN);
+        }else {
+            lv_obj_set_style_bg_color(child, lv_color_hex(0x0000ff), LV_PART_MAIN);
+            // lv_obj_set_height(child, 10);
+        }
+        printf("x = %d\r\n", x);
+
+        /*Use some opacity with larger translations*/
+        lv_opa_t opa = lv_map(x, 0, r, LV_OPA_TRANSP, LV_OPA_COVER);
+        // lv_obj_set_style_opa(child, LV_OPA_COVER - opa, 0);
+    }
+}
+
+/**
+ * Translate the object as they scroll
+ */
+void lv_example_scroll_233(void)
+{
+    lv_obj_t * cont = lv_obj_create(lv_scr_act());
+    lv_obj_set_size(cont, 240, 280);
+    lv_obj_center(cont);
+    lv_obj_set_flex_flow(cont, LV_FLEX_FLOW_COLUMN);
+    lv_obj_add_event_cb(cont, scroll_event_cb, LV_EVENT_SCROLL, NULL);
+    lv_obj_set_style_radius(cont, 10, 0);
+    lv_obj_set_style_clip_corner(cont, true, 0);
+    lv_obj_set_scroll_dir(cont, LV_DIR_VER);
+    lv_obj_set_scroll_snap_y(cont, LV_SCROLL_SNAP_CENTER);
+    lv_obj_set_scrollbar_mode(cont, LV_SCROLLBAR_MODE_OFF);
+
+    uint32_t i;
+    for(i = 0; i < 20; i++) {
+        lv_obj_t * btn = lv_btn_create(cont);
+        lv_obj_set_width(btn, lv_pct(100));
+        lv_obj_set_height(btn, 50);
+        lv_obj_set_style_radius(btn, 25, LV_PART_MAIN);
+
+        lv_obj_t * label = lv_label_create(btn);
+        lv_label_set_text_fmt(label, "Button %"LV_PRIu32, i);
+    }
+
+    /*Update the buttons position manually for first*/
+    lv_event_send(cont, LV_EVENT_SCROLL, NULL);
+
+    /*Be sure the fist button is in the middle*/
+    lv_obj_scroll_to_view(lv_obj_get_child(cont, 0), LV_ANIM_OFF);
+}
+
+
+
 static void event_handler(lv_event_t* e)
 {
     lv_event_code_t code = lv_event_get_code(e);
@@ -227,11 +317,25 @@ static void _lvgl_thread_entry()
     lv_port_indev_init();
     lcdFillScreen(&lcd_disp_dev, WHITE);
 
-    lv_example_btn_1233();
+    lv_example_scroll_233();
+
+    gpio_set_direction(GPIO_NUM_0, GPIO_MODE_INPUT);
 
     while (1) {
         lv_task_handler();
         vTaskDelay(pdMS_TO_TICKS(10));
+        if (!gpio_get_level(GPIO_NUM_0)) {
+            vTaskDelay(pdMS_TO_TICKS(100));
+            if (!gpio_get_level(GPIO_NUM_0)) {
+                if (app_display_handle.back_light_state) {
+                    lcdBacklightOff(&lcd_disp_dev);
+                    vTaskDelay(pdMS_TO_TICKS(100));
+                }else {
+                    lcdBacklightOn(&lcd_disp_dev);
+                }
+                app_display_handle.back_light_state = !app_display_handle.back_light_state;
+            }
+        }
     }
 }
 
diff --git a/main/APP/app_task_display/app_task_lvgl_port.c b/main/APP/app_task_display/app_task_lvgl_port.c
index e460f93..64753d0 100644
--- a/main/APP/app_task_display/app_task_lvgl_port.c
+++ b/main/APP/app_task_display/app_task_lvgl_port.c
@@ -27,7 +27,7 @@ static lv_disp_draw_buf_t disp_buf;
 static lv_disp_drv_t disp_drv; /*Descriptor of a display driver*/
 lv_indev_t*          touch_indev;
 
-#define DISP_BUF_SIZE (LV_HOR_RES_MAX * LV_VER_RES_MAX / 4)
+#define DISP_BUF_SIZE (LV_HOR_RES_MAX * LV_VER_RES_MAX / 8)
 
 static lv_disp_drv_t g_disp_drv;