部分 1
部分 1 的 3:使用亮度调节滑块（仅适用于笔记本）
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1
点击系统托盘里的“电源选项”按钮。它的图标看起来像是一块电池。只有在笔记本电脑上，才能看到这个图标。
如果你使用的笔记本电脑上没有显示“电源选项”按钮，请从“开始”菜单中打开“控制面板”，然后选择“电源选项”。
考虑到亮度调节是一种节省笔记本电量的选项，因此台式电脑没有亮度调节滑块。点击此处了解调节台式电脑屏幕亮度的具体细节。
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2
点击“调节屏幕亮度”链接。这会打开“电源选项”窗口。
当你点击“电源选项”按钮时没有找到这个选项，请点击此处。
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3
在屏幕底部调节亮度滑块。这会调整整个屏幕的亮度。调暗屏幕能节省电池电量，延长电池的寿命。
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部分 2
部分 2 的 3:恢复不见的亮度调节滑块（仅适用于笔记本电脑）
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1
点击“开始” 菜单，输入 .devmgmt.msc。 按下回车键打开设备管理器。这个程序控制着安装在电脑上的所有设备。当你的亮度调节滑块突然不见时，应该是因为控制显示器的某个软件或“驱动器”出现了某个问题。
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展开“监视器”类别。程序里列有不同的类别选项，包括“磁盘驱动器”、“显示适配器”和“键盘”等等。点击“监视器”左边的箭头按钮来展开它。
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3
右键点击列表中显示的显示器，选择“属性”。你只能更改列表中列出的显示器属性。如果你有两个或多个显示器，请先断开其它显示器和电脑的连接，然后选择你要调节的显示器。
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4
点击 .驱动程序 选项卡。
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点击 .卸载 按钮。 在出现的新窗口里，勾选“删除此设备的驱动程序软件”选项，并点击确定按钮来确认操作。
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等待系统卸载驱动程序。卸载过程不会花费太长时间。卸载驱动程序后，设备管理器列表会立刻刷新，你会注意到此时“监视器”选项不见了。
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7
点击“设备管理器”窗口顶部的“扫描检测硬件改动”按钮。它是一个小的正方形按钮，图标是一台前面有放大镜的计算机。点击这个按钮，程序会自动扫描系统中新安装的硬件（在这里并没有新安装的硬件）。
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确认监视器设备重新出现在列表中。当设备管理器扫描硬件更改时，它会自动为显示器重新安装基本的微软驱动器。这样应该能重新启用亮度调节滑块功能。
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9
重启电脑。这一步可能不是应用更改的必需步骤，但是重启电脑也没什么坏处，可能能帮你省去后面的麻烦。
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尝试调整屏幕亮度。重启电脑后，点击系统托盘里的“电源选项”按钮，找到恢复出的屏幕亮度调节选项。
如果还是没有亮度调节滑块，那么可能是因为你的显示适配器不支持它。你可以尝试更新显卡的驱动程序或使用其它方法来解决这个问题。
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部分 3
部分 3 的 3:使用“f.lux”程序调整显示器（适用于笔记本和台式机）
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1
下载f.lux 软件。 “f.lux”是一款根据时间变化和房间亮度而自动改变屏幕色温的免费软件。当你在深夜使用电脑时，它能将屏幕调成柔和护眼的偏黄光，让双眼更舒适。
我们不推荐设计师或其它依赖于精准色彩的工作人员使用“f.lux”程序。
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下载程序的安装包后，双击安装文件。这会按基本的配置设置运行安装进程。
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选择你的位置。“f.lux”程序使用你的定位来读取当地的日出日落数据，并按此来自动过渡调节屏幕色温。
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选择你房间的照明灯。告诉“f.lux”你使用的是哪款照明灯，能让它将屏幕的色温匹配、模拟成房间照明的亮度。这能将晚上的屏幕调暗，白天时的屏幕亮度依旧保持正常。
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如果f.lux 不能正常工作， 请更新显卡驱动程序。程序遇到问题时，这是最简单的修复错误的方式，它能修复大部分问题。
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