Partial response of 1.8inch TFT screen with arduino
The LCD you are using is a 3.3V part. The Tiva Launchpad is also a 3.3V part. However, the Arduino Uno is a 5V part.

You are supplying the LCD with too high a voltage -- quite frankly, you're lucky it is working at all. Use a level shifter, or use a 5V compatible LCD.