diff --git a/main/APP/app_task_display/app_task_display.c b/main/APP/app_task_display/app_task_display.c
index b495797..7af3725 100644
--- a/main/APP/app_task_display/app_task_display.c
+++ b/main/APP/app_task_display/app_task_display.c
@@ -29,14 +29,29 @@ TFT_t dev;
 
 TickType_t FillTest(TFT_t* dev, int width, int height)
 {
+    lcdBacklightOn(dev);
     TickType_t startTick, endTick, diffTick;
     startTick = xTaskGetTickCount();
 
-    lcdFillScreen(dev, RED);
+    // lcdFillScreen(dev, RED);
+    uint16_t data[1024] = {0};
+    int i = 0;
+    for ( i = 0; i < 1024; i++) {
+        data[i] = RED;
+    }
+    lcdDrawFillRectData(dev, 11, 11, 220, 220, data);
     vTaskDelay(50);
-    lcdFillScreen(dev, GREEN);
+    // lcdFillScreen(dev, GREEN);
+    for ( i = 0; i < 1024; i++) {
+        data[i] = GREEN;
+    }
+    lcdDrawFillRectData(dev, 11, 11, 220, 220, data);
     vTaskDelay(50);
-    lcdFillScreen(dev, BLUE);
+    // lcdFillScreen(dev, BLUE);
+    for ( i = 0; i < 1024; i++) {
+        data[i] = BLUE;
+    }
+    lcdDrawFillRectData(dev, 11, 11, 220, 220, data);
     vTaskDelay(50);
 
     endTick  = xTaskGetTickCount();
@@ -106,13 +121,15 @@ static void _display_thread_entry()
 uint8_t app_task_display_start()
 {
     cst816t_begin(34, 33, 35, 36);
-    xTaskCreatePinnedToCore(cst_scan_gesture, "sct test", 4096, NULL, 4, NULL, tskNO_AFFINITY);
+    // xTaskCreatePinnedToCore(cst_scan_gesture, "sct test", 4096, NULL, 4, NULL, tskNO_AFFINITY);
     spi_master_init(&dev, CONFIG_MOSI_GPIO, CONFIG_SCLK_GPIO, CONFIG_CS_GPIO, CONFIG_DC_GPIO, CONFIG_RESET_GPIO,
                     CONFIG_BL_GPIO);
     // lcdBacklightOn(&dev);
-    // vTaskDelay(1000);
     lcdInit(&dev, CONFIG_WIDTH, CONFIG_HEIGHT, CONFIG_OFFSETX, CONFIG_OFFSETY);
-    // lcdBacklightOn(&dev);
+    lcdBacklightOff(&dev);
+    vTaskDelay(100);
+    lcdFillScreen(&dev, BLACK);
+    vTaskDelay(100);
     xTaskCreatePinnedToCore(_display_thread_entry, "dsp test", 4096, NULL, 4, NULL, tskNO_AFFINITY);
 
 #if CONFIG_INVERSION
diff --git a/main/drivers/st7789/st7789.c b/main/drivers/st7789/st7789.c
index b400750..da7bb2e 100644
--- a/main/drivers/st7789/st7789.c
+++ b/main/drivers/st7789/st7789.c
@@ -234,6 +234,7 @@ bool spi_master_write_color(TFT_t * dev, uint16_t color, uint16_t size)
 // Add 202001
 bool spi_master_write_colors(TFT_t * dev, uint16_t * colors, uint16_t size)
 {
+#if LCD_FLIP_16BIT
 	static uint8_t Byte[1024];
 	int index = 0;
 	for(int i=0;i<size;i++) {
@@ -241,7 +242,11 @@ bool spi_master_write_colors(TFT_t * dev, uint16_t * colors, uint16_t size)
 		Byte[index++] = colors[i] & 0xFF;
 	}
 	gpio_set_level( dev->_dc, SPI_Data_Mode );
-	return spi_master_write_byte( dev->_SPIHandle, Byte, size*2);
+	return spi_master_write_byte( dev->_SPIHandle, Byte, size);
+#else
+    gpio_set_level( dev->_dc, SPI_Data_Mode );
+	return spi_master_write_byte( dev->_SPIHandle, colors, size);
+#endif
 }
 
 void delayMS(int ms) {
@@ -263,6 +268,7 @@ void lcdInit(TFT_t * dev, int width, int height, int offsetx, int offsety)
 	dev->_font_underline = false;
 
 #if 1
+    lcdBacklightOff(dev);
 	spi_master_write_command(dev, 0x01);	//Software Reset
 	delayMS(150);
 
@@ -416,9 +422,6 @@ void lcdInit(TFT_t * dev, int width, int height, int offsetx, int offsety)
 	spi_master_write_command(dev, 0x2C);
 #endif
 
-	if(dev->_bl >= 0) {
-		gpio_set_level( dev->_bl, 0 );
-	}
 }
 
 
@@ -1110,3 +1113,35 @@ void lcdInversionOff(TFT_t * dev) {
 void lcdInversionOn(TFT_t * dev) {
 	spi_master_write_command(dev, 0x21);	//Display Inversion On
 }
+
+
+void lcdDrawFillRectData(TFT_t * dev, uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint16_t *data)
+{
+    if (x1 >= dev->_width) return;
+	if (x2 >= dev->_width) x2=dev->_width-1;
+	if (y1 >= dev->_height) return;
+	if (y2 >= dev->_height) y2=dev->_height-1;
+
+	ESP_LOGD(TAG,"offset(x)=%d offset(y)=%d",dev->_offsetx,dev->_offsety);
+	uint16_t _x1 = x1 + dev->_offsetx;
+	uint16_t _x2 = x2 + dev->_offsetx;
+	uint16_t _y1 = y1 + dev->_offsety;
+	uint16_t _y2 = y2 + dev->_offsety;
+
+	bool ret = spi_master_write_command(dev, 0x2A);	// set column(x) address
+	printf("ret = %d\r\n", ret);
+	spi_master_write_addr(dev, _x1, _x2);
+	spi_master_write_command(dev, 0x2B);	// set Page(y) address
+	spi_master_write_addr(dev, _y1, _y2);
+	spi_master_write_command(dev, 0x2C);	//	Memory Write
+	for(int i=_x1;i<=_x2;i++){
+		uint16_t size = _y2-_y1+1;
+		spi_master_write_colors(dev, data, size * 2);
+#if 0
+		for(j=y1;j<=y2;j++){
+			//ESP_LOGD(TAG,"i=%d j=%d",i,j);
+			spi_master_write_data_word(dev, color);
+		}
+#endif
+	}
+}
\ No newline at end of file
diff --git a/main/drivers/st7789/st7789.h b/main/drivers/st7789/st7789.h
index c2c5c1a..8253ade 100644
--- a/main/drivers/st7789/st7789.h
+++ b/main/drivers/st7789/st7789.h
@@ -20,6 +20,7 @@
 #define DIRECTION180		2
 #define DIRECTION270		3
 
+#define LCD_FLIP_16BIT 1
 
 typedef struct {
 	uint16_t _width;
@@ -77,5 +78,7 @@ void lcdBacklightOff(TFT_t * dev);
 void lcdBacklightOn(TFT_t * dev);
 void lcdInversionOff(TFT_t * dev);
 void lcdInversionOn(TFT_t * dev);
+
+void lcdDrawFillRectData(TFT_t * dev, uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint16_t *data);
 #endif /* MAIN_ST7789_H_ */