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Why your 4K display looks softer than the laptop

为什么你的 4K 显示器不如笔记本屏清楚

Almost everyone notices it, and almost nobody is told why. macOS renders at 1× or 2× — there is no arbitrary scaling. A 27-inch 4K display sits right in the gap: at 2× everything is too big, so macOS falls back to 1× and the text loses its edge.

大多数人接上外接显示器的第一感受，而且几乎没人被告知原因。 macOS 只有 1 倍和 2 倍两种渲染方式，没有任意比例缩放。27 吋 4K 恰好卡在中间： 2 倍下什么都太大，于是 macOS 退回 1 倍，文字就失去了锐度。

The keys follow the sound, not the pointer

音量键跟着声音走，不跟着光标走

Brightness belongs to a display; volume belongs to an output device. Treating the volume keys like the brightness keys means that when you are on AirPods, the keys move a monitor's speakers you cannot hear — the HUD moves, the sound does not. So the volume keys are taken over in exactly one case: when the system output is an external display's own speakers, which is the case where DisplayPort audio often exposes no volume control at all and DDC does. Everything else is handed back to macOS, native HUD and all.

亮度是显示器的属性，音量是输出设备的属性。把音量键当亮度键处理，结果是你戴着 AirPods 时，按键去调了一台你根本听不到的显示器扬声器 —— HUD 动了，声音没变。所以音量键只在一种情况下被接管：系统输出正是某台外接显示器自己的音频端点 —— 这恰好是 DisplayPort 音频常常不暴露任何音量控制、而 DDC 可用的那一档。其余一切原样交还 macOS，连原生 HUD 和反馈音都保留。

Switch a screen off without closing the lid

不合盖子，也能关掉一块屏

A MacBook living on a stand still drives its own panel — backlight on, pixels rendered, for a screen nobody is looking at. The usual way to stop that is to shut the lid, which also closes off one of the surfaces the machine sheds heat through.

挂在支架上的 MacBook 仍然在驱动自己那块屏 —— 背光亮着、画面照渲染，而没有人在看它。要它停下来，常规做法是合盖，可那同时也封掉了机器散热的一个面。

Turn off takes a display out of the desktop in software instead. Windows move off it, the panel goes dark, and it comes back the moment you ask — no cable, no lid, nothing physical to undo. So the lid stays open for the airflow while the panel stops being driven, and you are no longer choosing between clamshell and a screen you do not use. There is a switch for doing it automatically whenever an external display connects.

「熄屏」是用软件把一块屏移出桌面：窗口挪走，面板熄灭，随时一句话就能回来 —— 不用拔线、不用合盖、没有任何物理动作要撤销。于是盖子开着保持风道，同时那块屏不再被驱动，你不必再在「合盖」和「留着一块用不上的屏」之间二选一。设置里还有一个开关：接上外接屏时自动把内建屏收起来。

It is a software disconnect and always reversible. The display's card folds, in place, into a row that brings it back. Quit the app and every display it switched off comes back on first; if the app is ever stopped abruptly, the row is still there the next time it starts. Switch off the screen you are looking at, and the other one gives you fifteen seconds to keep it — do nothing and it comes back by itself. Cutting a monitor's power over DDC is a different, irreversible thing, and it lives behind its own confirmation.

它走的是软件断开，永远可逆。那块屏的卡片原地收起成一行，点它就回来。退出应用时，被它熄掉的屏会先亮回来；应用万一被意外中止，下次启动时那一行还在。熄掉的是你正看着的那块屏时，另一块屏会给你 15 秒决定是否保持 —— 不操作，它就自己亮回来。通过 DDC 给显示器断电是另一回事，不可逆，藏在它自己的确认弹窗后面。

What it will not pretend to do

它不会假装能做的事

Your data

你的数据

No account, no sync, no analytics. The one request it can make is a daily update check, off until you turn it on, and it sends three things: the app, its version and your macOS version.

无账号、不同步、不收集分析数据。它唯一可能发出的请求是每天一次的更新检查，默认关闭，打开了才会发，而且只发三样：这是哪个应用、哪个版本、哪个 macOS。

Two permissions are optional and off until you ask: Accessibility, only if you want F1/F2 to act on an external display; Screen Recording, only for per-display screenshots.

两个权限都是可选的、默认关闭：「辅助功能」只在你想让 F1/F2 作用于外接屏时需要；「屏幕录制」只在使用按屏截图时需要。

Every feature, for everyone: no trial, no key, no nag. That includes the hard one — forced HiDPI, which gives a monitor that never advertised them the "looks like 2560×1440" modes a Retina screen renders at, instead of a stretched approximation.

所有功能，所有人都能用：没有试用期，没有密钥，没有催促。最难的那一项也在里面 —— 强制开启 HiDPI：给从不报告这些模式的显示器补上「看起来像 2560×1440」这样的档位，和 Retina 屏同一种渲染方式，而不是被拉伸过的近似值。

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