diff --git a/lib/led.js b/lib/led.js
index c778597..a03debf 100644
--- a/lib/led.js
+++ b/lib/led.js
@@ -46,6 +46,9 @@ function vfdTitleNormalize(raw) {
     .padEnd(4, ' ');
 }
 
+// O_WRONLY | O_NONBLOCK：FIFO 无读端时立即抛 ENXIO 而非永久阻塞事件循环
+const VFD_OPEN_FLAGS = fs.constants.O_WRONLY | fs.constants.O_NONBLOCK;
+
 function writeVfdPipeTitle(text4) {
   if (!vfdPipePresent()) return;
   const seg = vfdTitleNormalize(text4);
@@ -58,7 +61,7 @@ function writeVfdPipeTitle(text4) {
     return;
   }
   try {
-    const fd = fs.openSync(VFD_PIPE, 'w');
+    const fd = fs.openSync(VFD_PIPE, VFD_OPEN_FLAGS);
     fs.writeSync(fd, data);
     fs.closeSync(fd);
   } catch (e) {
@@ -71,7 +74,7 @@ function writeVfdPipeClock() {
   const data = Buffer.alloc(VFD_BUF_SIZE);
   data.writeUInt16LE(VFD_MODE_CLOCK, 0);
   try {
-    const fd = fs.openSync(VFD_PIPE, 'w');
+    const fd = fs.openSync(VFD_PIPE, VFD_OPEN_FLAGS);
     fs.writeSync(fd, data);
     fs.closeSync(fd);
   } catch (e) {
@@ -256,13 +259,6 @@ class Display {
     this._stopBlink();
     writeVfdPipeClock();
     log.info('display', '显示屏 → 时间');
-    // 每 30s 刷新一次，保持 vfdservice 持续从管道读取，
-    // 防止长时间无写入后管道"冷却"，导致后续 showPin 写入阻塞
-    const refresh = () => {
-      writeVfdPipeClock();
-      this._blinkTimer = setTimeout(refresh, 30_000);
-    };
-    this._blinkTimer = setTimeout(refresh, 30_000);
   }
 
   showPin(pin) {