diff --git a/os/board/rtl8730e/src/rtl8730e_mipi_lcdc.c b/os/board/rtl8730e/src/rtl8730e_mipi_lcdc.c
index a21a5110bc..65c473cd1a 100644
--- a/os/board/rtl8730e/src/rtl8730e_mipi_lcdc.c
+++ b/os/board/rtl8730e/src/rtl8730e_mipi_lcdc.c
@@ -46,7 +46,7 @@
 #define GPIO_PIN_BACKLIGHT
 #define MIPI_GPIO_RESET_PIN 	PA_14
 #endif
-
+static volatile bool pm_lock_status = 0;
 struct rtl8730e_lcdc_info_s {
 	struct mipi_lcd_config_s lcd_config;
 	pwmout_t pwm_led;
@@ -81,6 +81,7 @@ struct irq {
 	u32 num;
 	u32 data;
 	u32 priority;
+	bool disable_isr;
 };
 
 LCDC_TypeDef *pLCDC = LCDC;
@@ -93,6 +94,7 @@ struct irq lcdc_irq_info = {
 	.num = LCDC_IRQ,
 	.data = (u32) LCDC,
 	.priority = INT_PRI_HIGH,
+	.disable_isr = 0,
 };
 
 extern struct irq mipi_irq_info;
@@ -203,9 +205,25 @@ static void rtl8730e_gpio_init(void)
 static void rtl8730e_control_backlight(uint8_t level)
 {
 	float pwm_level = level/100.0;
-	lcdvdbg("level :%d , pwm level:%f\n", level, pwm_level);
+	lldbg("level :%d , pwm level:%f\n", level, pwm_level);
 #if defined(CONFIG_LCD_ST7785) || defined(CONFIG_LCD_ST7701SN)
+#ifdef CONFIG_PM
+	if (level != 0 && !pm_lock_status) {	/* backlight ON, we should lock domain */
+		bsp_pm_domain_control(BSP_MIPI_DRV, 1);
+		pm_lock_status = 1;
+	} else if (level == 0 && pm_lock_status) { /* backlight OFF, we should release lock*/
+		bsp_pm_domain_control(BSP_MIPI_DRV, 0);
+		pm_lock_status = 0;
+	}
+#endif
 	pwmout_write(&g_rtl8730e_config_dev_s.pwm_led, 1.0-pwm_level);
+	if (level == 0 && !(lcdc_irq_info.disable_isr)) {
+		InterruptDis(lcdc_irq_info.num);
+		lcdc_irq_info.disable_isr = 1;
+	} else if (level != 0 && lcdc_irq_info.disable_isr) {
+		InterruptEn(lcdc_irq_info.num, lcdc_irq_info.priority);
+		lcdc_irq_info.disable_isr = 0;
+	}
 #endif
 }