It's possible to adjust the contrast and brightness of the TD-15 or TD-11's display.
1. Press MENU.
2. Press the cursor up or down button to choose "Options."
3. Press the function 3 button (ENTER).
4. Press cursor up or down buttons to select the Contrast or the Brightness.
5. Turn the dial to adjust the value as desired.
6. Press EXIT when you're finished. The new setting is saved automatically.