diff --git a/main/boards/atoms3r-echo-base/atoms3r_echo_base.cc b/main/boards/atoms3r-echo-base/atoms3r_echo_base.cc
index cb771cd..ff2b79a 100644
--- a/main/boards/atoms3r-echo-base/atoms3r_echo_base.cc
+++ b/main/boards/atoms3r-echo-base/atoms3r_echo_base.cc
@@ -277,7 +277,7 @@ private:
     void InitializeIot() {
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
+        thing_manager.AddThing(iot::CreateThing("Screen"));
     }
 
 public:
diff --git a/main/boards/bread-compact-esp32-lcd/esp32_bread_board_lcd.cc b/main/boards/bread-compact-esp32-lcd/esp32_bread_board_lcd.cc
index 108d681..b6a7186 100644
--- a/main/boards/bread-compact-esp32-lcd/esp32_bread_board_lcd.cc
+++ b/main/boards/bread-compact-esp32-lcd/esp32_bread_board_lcd.cc
@@ -178,7 +178,7 @@ private:
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
         if (DISPLAY_BACKLIGHT_PIN != GPIO_NUM_NC) {
-            thing_manager.AddThing(iot::CreateThing("Backlight"));
+            thing_manager.AddThing(iot::CreateThing("Screen"));
         }
     }
 
diff --git a/main/boards/bread-compact-wifi-lcd/compact_wifi_board_lcd.cc b/main/boards/bread-compact-wifi-lcd/compact_wifi_board_lcd.cc
index 5699de2..43a8615 100644
--- a/main/boards/bread-compact-wifi-lcd/compact_wifi_board_lcd.cc
+++ b/main/boards/bread-compact-wifi-lcd/compact_wifi_board_lcd.cc
@@ -151,11 +151,8 @@ private:
     void InitializeIot() {
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Lamp"));
-        if (DISPLAY_BACKLIGHT_PIN != GPIO_NUM_NC) {
-            thing_manager.AddThing(iot::CreateThing("Backlight"));
-        }
         thing_manager.AddThing(iot::CreateThing("Screen"));
+        thing_manager.AddThing(iot::CreateThing("Lamp"));
     }
 
 public:
diff --git a/main/boards/du-chatx/du-chatx-wifi.cc b/main/boards/du-chatx/du-chatx-wifi.cc
index 6d495de..58ccdf5 100644
--- a/main/boards/du-chatx/du-chatx-wifi.cc
+++ b/main/boards/du-chatx/du-chatx-wifi.cc
@@ -128,7 +128,7 @@ private:
     void InitializeIot() {
         auto &thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
+        thing_manager.AddThing(iot::CreateThing("Screen"));
         thing_manager.AddThing(iot::CreateThing("Battery"));
     }
 
diff --git a/main/boards/esp-box-3/esp_box3_board.cc b/main/boards/esp-box-3/esp_box3_board.cc
index d744f58..67c5853 100644
--- a/main/boards/esp-box-3/esp_box3_board.cc
+++ b/main/boards/esp-box-3/esp_box3_board.cc
@@ -134,7 +134,7 @@ private:
     void InitializeIot() {
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
+        thing_manager.AddThing(iot::CreateThing("Screen"));
     }
 
 public:
diff --git a/main/boards/esp-box-lite/esp_box_lite_board.cc b/main/boards/esp-box-lite/esp_box_lite_board.cc
index e7b8a05..c53533c 100644
--- a/main/boards/esp-box-lite/esp_box_lite_board.cc
+++ b/main/boards/esp-box-lite/esp_box_lite_board.cc
@@ -203,7 +203,7 @@ private:
     void InitializeIot() {
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
+        thing_manager.AddThing(iot::CreateThing("Screen"));
     }
 
 public:
diff --git a/main/boards/esp-box/esp_box_board.cc b/main/boards/esp-box/esp_box_board.cc
index 31876a0..eb16f19 100644
--- a/main/boards/esp-box/esp_box_board.cc
+++ b/main/boards/esp-box/esp_box_board.cc
@@ -134,7 +134,7 @@ private:
     void InitializeIot() {
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
+        thing_manager.AddThing(iot::CreateThing("Screen"));
     }
 
 public:
diff --git a/main/boards/esp-sparkbot/esp_sparkbot_board.cc b/main/boards/esp-sparkbot/esp_sparkbot_board.cc
index 7b1cd8d..ad780ed 100644
--- a/main/boards/esp-sparkbot/esp_sparkbot_board.cc
+++ b/main/boards/esp-sparkbot/esp_sparkbot_board.cc
@@ -126,7 +126,7 @@ private:
     void InitializeIot() {
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
+        thing_manager.AddThing(iot::CreateThing("Screen"));
         thing_manager.AddThing(iot::CreateThing("Chassis"));
     }
 
diff --git a/main/boards/esp32-cgc/esp32_cgc_board.cc b/main/boards/esp32-cgc/esp32_cgc_board.cc
index 536a145..6e45328 100644
--- a/main/boards/esp32-cgc/esp32_cgc_board.cc
+++ b/main/boards/esp32-cgc/esp32_cgc_board.cc
@@ -154,7 +154,7 @@ private:
     void InitializeIot() {
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
+        thing_manager.AddThing(iot::CreateThing("Screen"));
     }
 
 public:
diff --git a/main/boards/esp32-s3-touch-amoled-1.8/esp32-s3-touch-amoled-1.8.cc b/main/boards/esp32-s3-touch-amoled-1.8/esp32-s3-touch-amoled-1.8.cc
index 29fe05e..458dcc8 100644
--- a/main/boards/esp32-s3-touch-amoled-1.8/esp32-s3-touch-amoled-1.8.cc
+++ b/main/boards/esp32-s3-touch-amoled-1.8/esp32-s3-touch-amoled-1.8.cc
@@ -230,9 +230,9 @@ private:
     void InitializeIot() {
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("BoardControl"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
+        thing_manager.AddThing(iot::CreateThing("Screen"));
         thing_manager.AddThing(iot::CreateThing("Battery"));
+        thing_manager.AddThing(iot::CreateThing("BoardControl"));
     }
 
 public:
diff --git a/main/boards/esp32-s3-touch-lcd-1.46/esp32-s3-touch-lcd-1.46.cc b/main/boards/esp32-s3-touch-lcd-1.46/esp32-s3-touch-lcd-1.46.cc
index ab08fd2..f5e3430 100644
--- a/main/boards/esp32-s3-touch-lcd-1.46/esp32-s3-touch-lcd-1.46.cc
+++ b/main/boards/esp32-s3-touch-lcd-1.46/esp32-s3-touch-lcd-1.46.cc
@@ -216,7 +216,7 @@ private:
     void InitializeIot() {
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
+        thing_manager.AddThing(iot::CreateThing("Screen"));
     }
 
 public:
diff --git a/main/boards/esp32-s3-touch-lcd-1.85/esp32-s3-touch-lcd-1.85.cc b/main/boards/esp32-s3-touch-lcd-1.85/esp32-s3-touch-lcd-1.85.cc
index 2019a14..4be53f9 100644
--- a/main/boards/esp32-s3-touch-lcd-1.85/esp32-s3-touch-lcd-1.85.cc
+++ b/main/boards/esp32-s3-touch-lcd-1.85/esp32-s3-touch-lcd-1.85.cc
@@ -433,7 +433,7 @@ private:
     void InitializeIot() {
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
+        thing_manager.AddThing(iot::CreateThing("Screen"));
     }
 
 public:
diff --git a/main/boards/esp32-s3-touch-lcd-1.85c/esp32-s3-touch-lcd-1.85c.cc b/main/boards/esp32-s3-touch-lcd-1.85c/esp32-s3-touch-lcd-1.85c.cc
index 37e0956..35625e9 100644
--- a/main/boards/esp32-s3-touch-lcd-1.85c/esp32-s3-touch-lcd-1.85c.cc
+++ b/main/boards/esp32-s3-touch-lcd-1.85c/esp32-s3-touch-lcd-1.85c.cc
@@ -378,7 +378,7 @@ private:
     void InitializeIot() {
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
+        thing_manager.AddThing(iot::CreateThing("Screen"));
     }
 
 public:
diff --git a/main/boards/kevin-sp-v3-dev/kevin-sp-v3_board.cc b/main/boards/kevin-sp-v3-dev/kevin-sp-v3_board.cc
index 9935f5d..184f9c1 100644
--- a/main/boards/kevin-sp-v3-dev/kevin-sp-v3_board.cc
+++ b/main/boards/kevin-sp-v3-dev/kevin-sp-v3_board.cc
@@ -95,8 +95,8 @@ private:
     void InitializeIot() {
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
+        thing_manager.AddThing(iot::CreateThing("Screen"));
         thing_manager.AddThing(iot::CreateThing("Lamp"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
     }
 
 public:
diff --git a/main/boards/kevin-sp-v4-dev/kevin-sp-v4_board.cc b/main/boards/kevin-sp-v4-dev/kevin-sp-v4_board.cc
index 323ebd3..a6e280b 100644
--- a/main/boards/kevin-sp-v4-dev/kevin-sp-v4_board.cc
+++ b/main/boards/kevin-sp-v4-dev/kevin-sp-v4_board.cc
@@ -108,8 +108,8 @@ private:
     void InitializeIot() {
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
+        thing_manager.AddThing(iot::CreateThing("Screen"));
         thing_manager.AddThing(iot::CreateThing("Lamp"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
     }
 
 public:
diff --git a/main/boards/kevin-yuying-313lcd/kevin_yuying_313lcd.cc b/main/boards/kevin-yuying-313lcd/kevin_yuying_313lcd.cc
index 4c8d48f..24eadca 100644
--- a/main/boards/kevin-yuying-313lcd/kevin_yuying_313lcd.cc
+++ b/main/boards/kevin-yuying-313lcd/kevin_yuying_313lcd.cc
@@ -147,7 +147,7 @@ private:
     void InitializeIot() {
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
+        thing_manager.AddThing(iot::CreateThing("Screen"));
     }
 
 public:
diff --git a/main/boards/lichuang-c3-dev/lichuang_c3_dev_board.cc b/main/boards/lichuang-c3-dev/lichuang_c3_dev_board.cc
index 9841378..0725a23 100644
--- a/main/boards/lichuang-c3-dev/lichuang_c3_dev_board.cc
+++ b/main/boards/lichuang-c3-dev/lichuang_c3_dev_board.cc
@@ -104,7 +104,7 @@ private:
     void InitializeIot() {
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
+        thing_manager.AddThing(iot::CreateThing("Screen"));
     }
 
 public:
diff --git a/main/boards/lichuang-dev/lichuang_dev_board.cc b/main/boards/lichuang-dev/lichuang_dev_board.cc
index fe71bf7..7a69fde 100644
--- a/main/boards/lichuang-dev/lichuang_dev_board.cc
+++ b/main/boards/lichuang-dev/lichuang_dev_board.cc
@@ -134,7 +134,6 @@ private:
     void InitializeIot() {
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
         thing_manager.AddThing(iot::CreateThing("Screen"));
     }
 
diff --git a/main/boards/lilygo-t-cameraplus-s3/lilygo-t-cameraplus-s3.cc b/main/boards/lilygo-t-cameraplus-s3/lilygo-t-cameraplus-s3.cc
index 25d7a38..8f58b6c 100644
--- a/main/boards/lilygo-t-cameraplus-s3/lilygo-t-cameraplus-s3.cc
+++ b/main/boards/lilygo-t-cameraplus-s3/lilygo-t-cameraplus-s3.cc
@@ -208,7 +208,7 @@ private:
     void InitializeIot() {
         auto &thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
+        thing_manager.AddThing(iot::CreateThing("Screen"));
     }
 
 public:
diff --git a/main/boards/lilygo-t-circle-s3/lilygo-t-circle-s3.cc b/main/boards/lilygo-t-circle-s3/lilygo-t-circle-s3.cc
index 99ab83a..d624dc8 100644
--- a/main/boards/lilygo-t-circle-s3/lilygo-t-circle-s3.cc
+++ b/main/boards/lilygo-t-circle-s3/lilygo-t-circle-s3.cc
@@ -226,7 +226,7 @@ private:
     void InitializeIot() {
         auto &thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
+        thing_manager.AddThing(iot::CreateThing("Screen"));
     }
 
 public:
diff --git a/main/boards/m5stack-core-s3/m5stack_core_s3.cc b/main/boards/m5stack-core-s3/m5stack_core_s3.cc
index 6e7a5a5..c74a952 100644
--- a/main/boards/m5stack-core-s3/m5stack_core_s3.cc
+++ b/main/boards/m5stack-core-s3/m5stack_core_s3.cc
@@ -309,7 +309,7 @@ private:
     void InitializeIot() {
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
+        thing_manager.AddThing(iot::CreateThing("Screen"));
         thing_manager.AddThing(iot::CreateThing("Battery"));
     }
 
diff --git a/main/boards/magiclick-2p4/magiclick_2p4_board.cc b/main/boards/magiclick-2p4/magiclick_2p4_board.cc
index 4676888..8f4181d 100644
--- a/main/boards/magiclick-2p4/magiclick_2p4_board.cc
+++ b/main/boards/magiclick-2p4/magiclick_2p4_board.cc
@@ -180,7 +180,7 @@ private:
     void InitializeIot() {
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
+        thing_manager.AddThing(iot::CreateThing("Screen"));
     }
 
 public:
diff --git a/main/boards/magiclick-2p5/magiclick_2p5_board.cc b/main/boards/magiclick-2p5/magiclick_2p5_board.cc
index 4e279b4..a1c0a00 100644
--- a/main/boards/magiclick-2p5/magiclick_2p5_board.cc
+++ b/main/boards/magiclick-2p5/magiclick_2p5_board.cc
@@ -224,7 +224,7 @@ private:
     void InitializeIot() {
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
+        thing_manager.AddThing(iot::CreateThing("Screen"));
     }
 
 public:
diff --git a/main/boards/magiclick-c3-v2/magiclick_c3_v2_board.cc b/main/boards/magiclick-c3-v2/magiclick_c3_v2_board.cc
index a754b35..8620b11 100644
--- a/main/boards/magiclick-c3-v2/magiclick_c3_v2_board.cc
+++ b/main/boards/magiclick-c3-v2/magiclick_c3_v2_board.cc
@@ -211,7 +211,7 @@ private:
     void InitializeIot() {
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
+        thing_manager.AddThing(iot::CreateThing("Screen"));
     }
 
 public:
diff --git a/main/boards/magiclick-c3/magiclick_c3_board.cc b/main/boards/magiclick-c3/magiclick_c3_board.cc
index b2c8a73..71a21f0 100644
--- a/main/boards/magiclick-c3/magiclick_c3_board.cc
+++ b/main/boards/magiclick-c3/magiclick_c3_board.cc
@@ -169,7 +169,7 @@ private:
     void InitializeIot() {
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
+        thing_manager.AddThing(iot::CreateThing("Screen"));
     }
 
 public:
diff --git a/main/boards/movecall-moji-esp32s3/movecall_moji_esp32s3.cc b/main/boards/movecall-moji-esp32s3/movecall_moji_esp32s3.cc
index c5ddf22..301b928 100644
--- a/main/boards/movecall-moji-esp32s3/movecall_moji_esp32s3.cc
+++ b/main/boards/movecall-moji-esp32s3/movecall_moji_esp32s3.cc
@@ -128,7 +128,7 @@ private:
     void InitializeIot() {
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker")); 
-        thing_manager.AddThing(iot::CreateThing("Backlight"));   
+        thing_manager.AddThing(iot::CreateThing("Screen"));   
     }
 
 public:
diff --git a/main/boards/sensecap-watcher/sensecap_watcher.cc b/main/boards/sensecap-watcher/sensecap_watcher.cc
index 98de17e..cdac914 100644
--- a/main/boards/sensecap-watcher/sensecap_watcher.cc
+++ b/main/boards/sensecap-watcher/sensecap_watcher.cc
@@ -239,7 +239,7 @@ private:
     void InitializeIot() {
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
+        thing_manager.AddThing(iot::CreateThing("Screen"));
     }
 
 public:
diff --git a/main/boards/taiji-pi-s3/taiji_pi_s3.cc b/main/boards/taiji-pi-s3/taiji_pi_s3.cc
index 1f1c98f..ca4c2d1 100644
--- a/main/boards/taiji-pi-s3/taiji_pi_s3.cc
+++ b/main/boards/taiji-pi-s3/taiji_pi_s3.cc
@@ -198,7 +198,7 @@ private:
     void InitializeIot() {
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
+        thing_manager.AddThing(iot::CreateThing("Screen"));
     }
     void InitializeMute() {
         gpio_reset_pin(AUDIO_MUTE_PIN);
diff --git a/main/boards/xingzhi-cube-1.54tft-ml307/xingzhi-cube-1.54tft-ml307.cc b/main/boards/xingzhi-cube-1.54tft-ml307/xingzhi-cube-1.54tft-ml307.cc
index 7f42c49..53dd362 100644
--- a/main/boards/xingzhi-cube-1.54tft-ml307/xingzhi-cube-1.54tft-ml307.cc
+++ b/main/boards/xingzhi-cube-1.54tft-ml307/xingzhi-cube-1.54tft-ml307.cc
@@ -162,7 +162,7 @@ private:
     void InitializeIot() {
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
+        thing_manager.AddThing(iot::CreateThing("Screen"));
         thing_manager.AddThing(iot::CreateThing("Battery"));
     }
 
diff --git a/main/boards/xingzhi-cube-1.54tft-wifi/xingzhi-cube-1.54tft-wifi.cc b/main/boards/xingzhi-cube-1.54tft-wifi/xingzhi-cube-1.54tft-wifi.cc
index a85b7a6..ac530f0 100644
--- a/main/boards/xingzhi-cube-1.54tft-wifi/xingzhi-cube-1.54tft-wifi.cc
+++ b/main/boards/xingzhi-cube-1.54tft-wifi/xingzhi-cube-1.54tft-wifi.cc
@@ -166,7 +166,7 @@ private:
     void InitializeIot() {
         auto& thing_manager = iot::ThingManager::GetInstance();
         thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Backlight"));
+        thing_manager.AddThing(iot::CreateThing("Screen"));
         thing_manager.AddThing(iot::CreateThing("Battery"));
     }
 
diff --git a/main/display/display.cc b/main/display/display.cc
index 7575fc5..2744bc0 100644
--- a/main/display/display.cc
+++ b/main/display/display.cc
@@ -15,6 +15,10 @@
 #define TAG "Display"
 
 Display::Display() {
+    // Load theme from settings
+    Settings settings("display", false);
+    current_theme_name_ = settings.GetString("theme", "light");
+
     // Notification timer
     esp_timer_create_args_t notification_timer_args = {
         .callback = [](void *arg) {
@@ -249,3 +253,9 @@ void Display::SetChatMessage(const char* role, const char* content) {
     }
     lv_label_set_text(chat_message_label_, content);
 }
+
+void Display::SetTheme(const std::string& theme_name) {
+    current_theme_name_ = theme_name;
+    Settings settings("display", true);
+    settings.SetString("theme", theme_name);
+}
diff --git a/main/display/display.h b/main/display/display.h
index eef02b0..a510240 100644
--- a/main/display/display.h
+++ b/main/display/display.h
@@ -25,8 +25,8 @@ public:
     virtual void SetEmotion(const char* emotion);
     virtual void SetChatMessage(const char* role, const char* content);
     virtual void SetIcon(const char* icon);
-    virtual void SetTheme(const std::string& theme_name){}
-    virtual std::string GetTheme() { return "light"; }
+    virtual void SetTheme(const std::string& theme_name);
+    virtual std::string GetTheme() { return current_theme_name_; }
 
     inline int width() const { return width_; }
     inline int height() const { return height_; }
@@ -50,6 +50,7 @@ protected:
     const char* battery_icon_ = nullptr;
     const char* network_icon_ = nullptr;
     bool muted_ = false;
+    std::string current_theme_name_;
 
     esp_timer_handle_t notification_timer_ = nullptr;
     esp_timer_handle_t update_timer_ = nullptr;
diff --git a/main/display/lcd_display.cc b/main/display/lcd_display.cc
index 4ae9b93..02bfe16 100644
--- a/main/display/lcd_display.cc
+++ b/main/display/lcd_display.cc
@@ -76,8 +76,6 @@ static const ThemeColors LIGHT_THEME = {
 
 // Current theme - initialize based on default config
 static ThemeColors current_theme = LIGHT_THEME;
-// Add theme name variable to track current theme
-static std::string current_theme_name = "light";
 
 
 LV_FONT_DECLARE(font_awesome_30_4);
@@ -144,17 +142,11 @@ SpiLcdDisplay::SpiLcdDisplay(esp_lcd_panel_io_handle_t panel_io, esp_lcd_panel_h
         lv_display_set_offset(display_, offset_x, offset_y);
     }
 
-    // Load theme from settings
-    Settings settings("display", false);
-    std::string theme = settings.GetString("theme", "");
-    if (!theme.empty()) {
-        if (theme == "dark") {
-            current_theme = DARK_THEME;
-            current_theme_name = "dark";
-        } else if (theme == "light") {
-            current_theme = LIGHT_THEME;
-            current_theme_name = "light";
-        }
+    // Update the theme
+    if (current_theme_name_ == "dark") {
+        current_theme = DARK_THEME;
+    } else if (current_theme_name_ == "light") {
+        current_theme = LIGHT_THEME;
     }
 
     SetupUI();
@@ -221,17 +213,11 @@ RgbLcdDisplay::RgbLcdDisplay(esp_lcd_panel_io_handle_t panel_io, esp_lcd_panel_h
         lv_display_set_offset(display_, offset_x, offset_y);
     }
 
-    // Load theme from settings
-    Settings settings("display", false);
-    std::string theme = settings.GetString("theme", "");
-    if (!theme.empty()) {
-        if (theme == "dark") {
-            current_theme = DARK_THEME;
-            current_theme_name = "dark";
-        } else if (theme == "light") {
-            current_theme = LIGHT_THEME;
-            current_theme_name = "light";
-        }
+    // Update the theme
+    if (current_theme_name_ == "dark") {
+        current_theme = DARK_THEME;
+    } else if (current_theme_name_ == "light") {
+        current_theme = LIGHT_THEME;
     }
 
     SetupUI();
@@ -711,22 +697,16 @@ void LcdDisplay::SetIcon(const char* icon) {
 void LcdDisplay::SetTheme(const std::string& theme_name) {
     DisplayLockGuard lock(this);
     
-    // Update the current theme based on the theme name
     if (theme_name == "dark" || theme_name == "DARK") {
         current_theme = DARK_THEME;
-        current_theme_name = "dark";
     } else if (theme_name == "light" || theme_name == "LIGHT") {
         current_theme = LIGHT_THEME;
-        current_theme_name = "light";
     } else {
         // Invalid theme name, return false
+        ESP_LOGE(TAG, "Invalid theme name: %s", theme_name.c_str());
         return;
     }
     
-    // Save theme to settings
-    Settings settings("display", true);
-    settings.SetString("theme", current_theme_name);
-    
     // Get the active screen
     lv_obj_t* screen = lv_screen_active();
     
@@ -902,17 +882,7 @@ void LcdDisplay::SetTheme(const std::string& theme_name) {
     if (low_battery_popup_ != nullptr) {
         lv_obj_set_style_bg_color(low_battery_popup_, current_theme.low_battery, 0);
     }
-}
 
-std::string LcdDisplay::GetTheme() {
-    // First try to read from settings
-    Settings settings("display", false);
-    std::string theme = settings.GetString("theme", "light");
-    
-    // If theme is not set in settings, return the current theme
-    if (theme.empty()) {
-        return current_theme_name;
-    }
-    
-    return theme;
+    // No errors occurred. Save theme to settings
+    Display::SetTheme(theme_name);
 }
diff --git a/main/display/lcd_display.h b/main/display/lcd_display.h
index 7ee0be9..a12c893 100644
--- a/main/display/lcd_display.h
+++ b/main/display/lcd_display.h
@@ -41,7 +41,6 @@ public:
 
     // Add theme switching function
     virtual void SetTheme(const std::string& theme_name) override;
-    virtual std::string GetTheme() override;
 };
 
 // RGB LCD显示器
diff --git a/main/iot/things/backlight.cc b/main/iot/things/backlight.cc
deleted file mode 100644
index 1e7ae81..0000000
--- a/main/iot/things/backlight.cc
+++ /dev/null
@@ -1,38 +0,0 @@
-#include "iot/thing.h"
-#include "board.h"
-#include "display/lcd_display.h"
-#include "settings.h"
-
-#include <esp_log.h>
-
-#define TAG "Backlight"
-
-namespace iot {
-
-// 这里仅定义 Backlight 的属性和方法，不包含具体的实现
-class Backlight : public Thing {
-public:
-    Backlight() : Thing("Backlight", "屏幕背光") {
-        // 定义设备的属性
-        properties_.AddNumberProperty("brightness", "当前亮度百分比", [this]() -> int {
-            // 这里可以添加获取当前亮度的逻辑
-            auto backlight = Board::GetInstance().GetBacklight();
-            return backlight ? backlight->brightness() : 0;
-        });
-
-        // 定义设备可以被远程执行的指令
-        methods_.AddMethod("SetBrightness", "设置亮度", ParameterList({
-            Parameter("brightness", "0到100之间的整数", kValueTypeNumber, true)
-        }), [this](const ParameterList& parameters) {
-            uint8_t brightness = static_cast<uint8_t>(parameters["brightness"].number());
-            auto backlight = Board::GetInstance().GetBacklight();
-            if (backlight) {
-                backlight->SetBrightness(brightness, true);
-            }
-        });
-    }
-};
-
-} // namespace iot
-
-DECLARE_THING(Backlight);
diff --git a/main/iot/things/screen.cc b/main/iot/things/screen.cc
index 67fcee9..eea1606 100644
--- a/main/iot/things/screen.cc
+++ b/main/iot/things/screen.cc
@@ -13,13 +13,19 @@ namespace iot {
 // 这里仅定义 Screen 的属性和方法，不包含具体的实现
 class Screen : public Thing {
 public:
-    Screen() : Thing("Screen", "这是一个屏幕，可设置主题") {
+    Screen() : Thing("Screen", "这是一个屏幕，可设置主题和亮度") {
         // 定义设备的属性
         properties_.AddStringProperty("theme", "主题", [this]() -> std::string {
             auto theme = Board::GetInstance().GetDisplay()->GetTheme();
             return theme;
         });
 
+        properties_.AddNumberProperty("brightness", "当前亮度百分比", [this]() -> int {
+            // 这里可以添加获取当前亮度的逻辑
+            auto backlight = Board::GetInstance().GetBacklight();
+            return backlight ? backlight->brightness() : 100;
+        });
+
         // 定义设备可以被远程执行的指令
         methods_.AddMethod("SetTheme", "设置屏幕主题", ParameterList({
             Parameter("theme_name", "主题模式, light 或 dark", kValueTypeString, true)
@@ -30,6 +36,16 @@ public:
                 display->SetTheme(theme_name);
             }
         });
+        
+        methods_.AddMethod("SetBrightness", "设置亮度", ParameterList({
+            Parameter("brightness", "0到100之间的整数", kValueTypeNumber, true)
+        }), [this](const ParameterList& parameters) {
+            uint8_t brightness = static_cast<uint8_t>(parameters["brightness"].number());
+            auto backlight = Board::GetInstance().GetBacklight();
+            if (backlight) {
+                backlight->SetBrightness(brightness, true);
+            }
+        });
     }
 };