LCD module back light brightness

Other Hardware Displays
1

Hello,

I got a 20x4 LCD module for the arduino. The issue I am currently having is that all the pixels have a degree of brightness to them when they aren't even turned on.

Is this because my LCD module is cheap?

I used the example code:

#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Set the LCD address to 0x27 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup()
{
// initialize the LCD
lcd.begin();
lcd.clear();

// Turn on the blacklight and print a message.
//lcd.backlight();
lcd.print("Hello World");
}

void loop()
{
// Do nothing here...
}

I have attached an image also.

Thanks,

Gaz

IMG_3044.jpg
IMG_3044.jpg3024×4032 1.09 MB

2

IMG_3044.jpg

gazitron:
Is this because my LCD module is cheap?

Errrr - no!

Now, with only that photo we can't quite see what you have, but it clearly includes an I2C "backpack" on the back of the display (as the code defines). The cable tells me you have an Arduino UNO.

On the backpack is a contrast adjusting potentiometer. Adjust it! :grinning: