diff --git a/components/dwin/dwin_screen.cpp b/components/dwin/dwin_screen.cpp
index 5450674..bb42273 100644
--- a/components/dwin/dwin_screen.cpp
+++ b/components/dwin/dwin_screen.cpp
@@ -359,8 +359,8 @@ bool DwinScreen::ping() {
 
 bool DwinScreen::set_brightness(uint16_t brightness) {
   // 5A A5 04 82 0082 0A
-  uint8_t data[3] = {0, 0x82, (uint8_t)brightness};
-  return write_varspace(0x82, data, 3, 10);
+  uint8_t data[2] = {(uint8_t)brightness, (uint8_t)brightness};
+  return write_varspace(0x82, data, 2, 10);
 }
 bool DwinScreen::set_rtc(uint16_t year, uint16_t month, uint16_t day, uint16_t hour, uint16_t minute, uint16_t second) {
   year = year - 2000;