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 that was switched off keeps a row of its own at the top of the panel — that row is how it comes back, and it is why switching a screen off can never lose it. 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。被熄掉的那块屏会在面板顶部留下自己的一行 —— 那一行就是它回来的入口，也是为什么「熄屏」不可能把一块屏弄丢。 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
Apple displays ignore DDC
Apple 自家屏不响应 DDC
A Studio Display speaks Apple's own protocol, not DDC/CI. Brightness works through the Apple path; contrast and input switching are shown as unavailable, because they are.
Studio Display 用的是 Apple 自有协议，不是 DDC/CI。亮度走 Apple 的通道； 对比度和输入源会显示为不可用 —— 因为事实如此。
Two operations cannot be undone
两个操作软件撤不回来
On some monitors, a DDC power-off or an input switch takes the display out of the system entirely — the physical button is the only way back. Both ask first, and both say so.
在有些显示器上，DDC 断电或切换输入会让显示器整个离开系统 —— 只能按物理按键回来。两者都会先确认，也都会说明清楚。
Apple Silicon only
只支持 Apple Silicon
DDC/CI here runs over IOAVService, which does not exist on Intel
Macs. Rather than ship a build that half-works, the Intel paths were removed.
这里的 DDC/CI 走 IOAVService，Intel 机器上根本没有这个接口。
与其发一个半能用的版本，不如把 Intel 路径整个移除。
Nothing leaves your Mac
没有任何东西离开你的 Mac
There is no network code in the app. No account, no sync, no analytics, and the licence is verified offline on your own machine.
应用里没有网络代码。无账号、不同步、不收集分析数据， 授权在你自己的机器上离线校验。
Pro unlocks one thing
Pro 只解锁一件事
Forced HiDPI. Your monitor has the pixels; what it lacks are the modes macOS will render at 2× into. Pro writes them into the system, and after a restart you get options like "looks like 2560×1440" — rendered the way a Retina screen is, instead of a stretched approximation. Everything else in the app is free.
强制开启 HiDPI。你的显示器像素足够多，缺的只是 macOS 愿意用 2 倍渲染的 那几档模式。Pro 把它们补进系统，重启后就多出「看起来像 2560×1440」这样的选项 —— 和 Retina 屏同一种渲染方式，而不是被拉伸过的近似值。应用里其余功能都是免费的。
It needs an administrator password, which macOS asks for directly — the app never sees it — and the override can be removed from the same menu it was installed from.
它需要管理员密码，由 macOS 自己弹窗索取 —— 应用不接触这个密码 —— 覆盖也可以从安装它的同一个菜单里移除。
Free
免费
Everything else. Per-display brightness, contrast, warmth, volume, resolution, orientation, input source, power, screenshots, presets, global shortcuts, the media keys, the command line. No trial period, no nag, no feature held back except the one below.
其余全部功能。按屏亮度、对比度、色温、音量、分辨率、方向、输入源、开关、 截图、场景、全局快捷键、媒体键、命令行。没有试用期，没有催促弹窗，除了下面那一项之外 不扣任何功能。
Pro — A$9.99, once
Pro —— A$9.99，一次性
Forced HiDPI, on every Mac you personally work on. The licence is registered to your email address and verified offline; there is no subscription and nothing to renew.
强制开启 HiDPI，你自己用的每一台 Mac 都能激活。授权登记在你的邮箱名下、 离线校验；没有订阅，没有需要续的东西。
Licences are issued by hand, usually the same day: you get the key, a one-click activation link, and an invoice from PWE Group Pty Ltd.
授权是人工签发的，通常当天发出：你会收到密钥、一个一键激活链接， 以及 PWE Group Pty Ltd 开具的发票。
Requirements
运行要求
Any M-series Mac, macOS 26 or later. Every M chip drives displays through the same Apple Silicon stack, and the app resolves what it needs at run time rather than checking a model name — so the answer for your machine is a five-second self-check in Settings, not a compatibility list. It has been run end to end on an M1 and on an M4 Max, across macOS 26.6.2 and 27, with all sixteen checks green on both.
全部 M 系列机型，macOS 26 或更新版本。每一代 M 芯片驱动显示器走的都是同一套 Apple Silicon 栈，而这个应用是在运行时解析它需要的接口，不是去比对机型名 —— 所以你那台机器的 答案是设置里五秒钟的自检，不是一张兼容列表。M1 与 M4 Max 上都完整跑过，横跨 macOS 26.6.2 与 27，两台机器 16 项自检全绿。
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。