How to Use 1.9 Inch IPS Full Angle TFT Display: Examples, Pinouts, and Specs

The 1.9 Inch IPS Full Angle TFT Display is a compact display module with a 1.9-inch diagonal screen. It features In-Plane Switching (IPS) technology, which ensures wide viewing angles and vibrant color reproduction. This display is ideal for embedded applications, portable devices, and projects requiring a high-quality visual interface in a small form factor. Its compact size and excellent performance make it suitable for use in smart devices, handheld instruments, and DIY electronics projects.

Below are the key technical details of the 1.9 Inch IPS Full Angle TFT Display:

The display module typically has the following pinout:

1. Power Supply: Connect the VCC pin to a 3.3V power source and the GND pin to ground.
2. SPI Interface: Connect the SCL (clock) and SDA (data) pins to the corresponding SPI pins on your microcontroller.
3. Control Pins:
   • Connect the RES pin to a GPIO pin on your microcontroller for resetting the display.
   • Use the DC pin to differentiate between data and command signals.
   • Connect the CS pin to a GPIO pin to enable or disable the display module.
4. Backlight: The BLK pin can be connected to a PWM-capable GPIO pin for brightness control or directly to 3.3V for constant backlight.

• Voltage Levels: Ensure all logic signals are at 3.3V. If using a 5V microcontroller (e.g., Arduino UNO), use level shifters to avoid damaging the display.
• SPI Speed: Configure the SPI clock speed to a value supported by the display (typically up to 10 MHz).
• Initialization: The display requires proper initialization commands to function. Use libraries like Adafruit_GFX and Adafruit_ST7789 for easier setup.
• Backlight Control: Use PWM to adjust the brightness of the backlight for power efficiency.

Below is an example of how to use the 1.9 Inch IPS Full Angle TFT Display with an Arduino UNO. This code uses the Adafruit_ST7789 library.

#include <Adafruit_GFX.h>      // Core graphics library
#include <Adafruit_ST7789.h>   // ST7789 driver library
#include <SPI.h>               // SPI library

// Define pin connections
#define TFT_CS    10  // Chip Select pin
#define TFT_RST   9   // Reset pin
#define TFT_DC    8   // Data/Command pin

// Create an instance of the display
Adafruit_ST7789 tft = Adafruit_ST7789(TFT_CS, TFT_DC, TFT_RST);

void setup() {
  // Initialize serial communication for debugging
  Serial.begin(9600);
  Serial.println("Initializing display...");

  // Initialize the display with a 3.3V power supply
  tft.init(170, 320);  // Initialize with resolution 170x320
  tft.setRotation(1);  // Set display orientation

  // Fill the screen with a solid color
  tft.fillScreen(ST77XX_BLUE);
  Serial.println("Display initialized!");
}

void loop() {
  // Example: Draw a red rectangle
  tft.fillRect(10, 10, 100, 50, ST77XX_RED);
  delay(2000);

  // Example: Display text
  tft.setTextColor(ST77XX_WHITE);
  tft.setTextSize(2);
  tft.setCursor(10, 70);
  tft.print("Hello, World!");
  delay(2000);
}

1. Display Not Turning On:

   • Ensure the VCC and GND pins are properly connected.
   • Verify that the power supply provides a stable 3.3V.

2. No Image or Incorrect Colors:

   • Check the SPI connections (SCL, SDA, CS, DC, RES) for loose or incorrect wiring.
   • Ensure the initialization code matches the display's driver IC (ST7789).

3. Flickering or Dim Backlight:

   • Verify the BLK pin is connected to 3.3V or a PWM signal.
   • Check for sufficient current supply to the backlight (~20mA).

4. Text or Graphics Not Displaying Properly:

   • Confirm the SPI clock speed is within the supported range.
   • Ensure the correct resolution (170x320) is set in the initialization code.

Q: Can I use this display with a 5V microcontroller?
A: Yes, but you must use level shifters to convert 5V logic signals to 3.3V to avoid damaging the display.

Q: Is the backlight brightness adjustable?
A: Yes, you can control the brightness using a PWM signal on the BLK pin.

Q: What is the maximum SPI clock speed supported?
A: The display typically supports SPI clock speeds up to 10 MHz. Check the datasheet for exact details.

Q: Can I use this display in outdoor applications?
A: While the display has a wide operating temperature range, it is not sunlight-readable and may require additional protection from environmental factors.