diff --git a/server/backend/internal/httpapi/manage/display.go b/server/backend/internal/httpapi/manage/display.go
new file mode 100644
index 0000000..8c101ef
--- /dev/null
+++ b/server/backend/internal/httpapi/manage/display.go
@@ -0,0 +1,53 @@
+package manage
+
+import (
+	"encoding/json"
+	"log/slog"
+	"net/http"
+
+	"git.az-it.net/az/morz-infoboard/server/backend/internal/mqttnotifier"
+	"git.az-it.net/az/morz-infoboard/server/backend/internal/store"
+)
+
+// HandleDisplayCommand nimmt {"state":"on"} oder {"state":"off"} entgegen und
+// schickt den entsprechenden MQTT-Befehl an den Agent.
+func HandleDisplayCommand(screens *store.ScreenStore, notifier *mqttnotifier.Notifier) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		screenSlug := r.PathValue("screenSlug")
+		screen, err := screens.GetBySlug(r.Context(), screenSlug)
+		if err != nil {
+			http.Error(w, "screen not found", http.StatusNotFound)
+			return
+		}
+		if !requireScreenAccess(w, r, screen) {
+			return
+		}
+
+		var body struct {
+			State string `json:"state"`
+		}
+		if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+			http.Error(w, "invalid JSON", http.StatusBadRequest)
+			return
+		}
+
+		var action string
+		switch body.State {
+		case "on":
+			action = "display_on"
+		case "off":
+			action = "display_off"
+		default:
+			http.Error(w, `state must be "on" or "off"`, http.StatusBadRequest)
+			return
+		}
+
+		if err := notifier.SendDisplayCommand(screenSlug, action); err != nil {
+			slog.Error("send display command", "err", err)
+			http.Error(w, "failed to send command", http.StatusBadGateway)
+			return
+		}
+
+		w.WriteHeader(http.StatusNoContent)
+	}
+}
diff --git a/server/backend/internal/httpapi/router.go b/server/backend/internal/httpapi/router.go
index 3a33b78..bbbfbe4 100644
--- a/server/backend/internal/httpapi/router.go
+++ b/server/backend/internal/httpapi/router.go
@@ -67,7 +67,7 @@ func NewRouter(deps RouterDeps) http.Handler {
 	mux.HandleFunc("GET /api/v1/meta", handleMeta)
 
 	// ── Player status (existing) ──────────────────────────────────────────
-	mux.HandleFunc("POST /api/v1/player/status", handlePlayerStatus(deps.StatusStore, deps.Config.MQTTBroker, deps.Config.MQTTUsername, deps.Config.MQTTPassword))
+	mux.HandleFunc("POST /api/v1/player/status", handlePlayerStatus(deps.StatusStore, deps.ScreenStore, deps.Config.MQTTBroker, deps.Config.MQTTUsername, deps.Config.MQTTPassword))
 	mux.HandleFunc("POST /api/v1/player/screenshot", handlePlayerScreenshot(deps.ScreenshotStore))
 	mux.HandleFunc("GET /api/v1/screens/status", handleListLatestPlayerStatuses(deps.StatusStore))
 	mux.HandleFunc("GET /api/v1/screens/{screenId}/status", handleGetLatestPlayerStatus(deps.StatusStore))
@@ -183,6 +183,10 @@ func registerManageRoutes(mux *http.ServeMux, d RouterDeps) {
 	mux.Handle("GET /api/v1/screens/{screenId}/screenshot",
 		authOnly(http.HandlerFunc(handleGetScreenshot(d.ScreenshotStore))))
 
+	// ── Display control ───────────────────────────────────────────────────
+	mux.Handle("POST /api/v1/screens/{screenSlug}/display",
+		authOnly(http.HandlerFunc(manage.HandleDisplayCommand(d.ScreenStore, notifier))))
+
 	// ── JSON API — screens ────────────────────────────────────────────────
 	// Self-registration: no auth (player calls this on startup).
 	mux.HandleFunc("POST /api/v1/screens/register",