The PSP has no button labeled "Display." You likely need one of these:
| Button | Location | Common Function |
|---|---|---|
| HOME | Center, below screen (PS logo) | Exit game → XMB menu |
| START | Right of screen, lower | Pause / confirm in menus |
| SELECT | Left of screen, lower | Secondary menu / map / scoreboard |
| D-Pad | Left face | Menu navigation, movement |
| △ ○ × □ | Right face | Action / cancel / jump / attack |
| L / R | Top shoulders | Camera, aim, shoulder buttons |
| VOL +/- | Left side (1000/2000) / Top (3000/Go) | Volume |
| BRIGHTNESS | Left side (1000/2000) / Top (3000/Go) | Screen brightness (hold + vol) |
| HOLD | Right side (switch) | Lock controls (power saver) |
If you're trying to screenshot: HOME → Photo → Save Screenshot (CFW/plugins enable NOTE+START).