iPhone 或 iPad 上的显示屏是否会随机变暗？我们将向您展示发生这种情况的原因以及您可以采取哪些措施来解决 iOS 和 iPadOS 设备上的屏幕变暗问题。

iPhone 上的显示屏会因多种原因而持续变暗。例如，这可能是由于 iOS 中内置的自动亮度功能或自动锁定^(Auto-Lock)和低功耗模式^{(Low Power Mode)}等电源管理设置。以下是 iPhone 显示屏变暗的所有可能方式以及如何阻止这种情况发生。

关闭自动亮度

默认情况下，您的 iPhone 使用称为自动亮度^{(Auto-Brightness)}的辅助功能，根据设备环境光传感器的输入自动调整屏幕亮度。但是，它并不总是在所有环境中都做得很好。

如果您的 iPhone 显示屏太暗，您可以选择禁用自动亮度^{(Auto-Brightness)}并手动管理亮度级别。要做到这一点：

1. 打开 iPhone 上的设置^(Settings)应用程序。
2. 向下滚动并点击辅助功能。
3. 点击显示和文字大小。
4. 向下滚动^(Scroll)并关闭Auto-Brightness旁边的开关。

1. 打开 iPhone 的控制中心^{(Control Center)}（从屏幕右上角向下滑动或双击主页^(Home)按钮）并使用亮度^(Brightness)滑块手动增加或减少亮度级别。

延长自动锁定持续时间

如果您的 iPhone 处于 30 秒的自动锁定^(Auto-Lock)持续时间，那么在看似令人讨厌的短时间之后，屏幕可能会变暗。要增加它：

1. 打开设置。
2. 向下滚动^(Scroll)并点击显示^(Display)和亮度^(Brightness)。
3. 点击自动锁定^{(Tap Auto-Lock)}并选择至少 1 分钟或更长时间的持续时间。

注意：避免较长的时间范围，因为它们会对 iPhone 的电池寿命产生不利影响。

禁用低功耗模式

低功耗模式^{(Low Power Mode)}是一项可选的电源管理功能，您可以在 iPhone 的电池电量低于 20% 时激活。它减少了电子邮件获取和后台刷新等活动，使 iPhone 的屏幕变暗，并将自动锁定^(Auto-Lock)持续时间恢复为 30 秒。

一旦你的 iPhone 充电到至少 80%，^{(once your iPhone recharges to at least 80 percent)} iOS 会自动禁用低功耗模式^{(Power Mode)} 。但是，您可以随时将其关闭。

1. 打开 iPhone 上的设置^(Settings)应用程序。
2. 向下滚动并点击电池。
3. 关闭低功耗模式^{(Low Power Mode)}旁边的开关。

禁用注意力意识

如果您使用 iPhone X 或任何其他支持Face ID的 iOS 设备，当您不看 iPhone 时，一个名为Attention Aware的功能会自动使您的 iPhone 屏幕变暗。^{(Attention Aware)}如果这让您烦恼：

1. 打开 iPhone 上的设置^(Settings)应用程序。
2. 向下滚动^(Scroll)并点按面容 ID^{(Face ID)}和密码^(Passcode)。
3. 使用 iPhone 的设备密码进行身份验证^{(Authenticate)}，然后关闭Attention Aware Features旁边的开关。

注意：关闭^(Turning)注意力感知^{(Attention Aware)}还会禁用其他一些有用的功能，例如自动扩展通知和低音量警报 。

关闭原音

如果您使用 iPhone 8 或更新的 iOS 设备，名为True Tone的功能将自动调整显示颜色和强度以匹配环境照明条件。但是，它会发出奇怪的调光或闪烁效果，让一些人感到困扰。如果要禁用True Tone：

1. 打开 iPhone 上的设置^(Settings)应用程序。
2. 向下滚动^(Scroll)并点击显示^(Display)和亮度^(Brightness)。
3. 关闭True Tone旁边的开关。

禁用夜班功能

iPhone 的另一个内置功能Night Shift通过加热 iPhone 的色温来减少蓝光。然而，它以降低屏幕亮度为代价实现了这一点。要禁用夜班^{(Night Shift)}：

1. 打开 iPhone 的控制中心。
2. 长按亮度滑块。
3. 禁用夜班图标。

如果要配置Night Shift的工作方式：

1. 打开 iPhone 上的设置^(Settings)应用程序，然后点击显示^(Display)和亮度^(Brightness)。
2. 点击夜班。
3. 更改夜班^{(Night Shift)}时间表或调整色温。它设置的温度越低，尽管启用了该功能，你的 iPhone 会显得越亮。

禁用减少白点

iPhone 的辅助功能设置包括一个能够降低白色强度的选项。如果您的 iPhone 屏幕亮度显得太暗​​，请检查该功能是否处于活动状态并将其禁用。要做到这一点：

1. 打开 iPhone 上的设置^(Settings)应用程序。
2. 转到Accessibility > Display和文本大小^{(Text Size)}。
3. 向下滚动^(Scroll)并关闭减少白点^{(Reduce White Point)}旁边的开关。

iPhone屏幕一直变暗^{(Screen Keeps Dimming)}？继续^(Continue)这些修复

如果您的 iPhone 的显示屏亮度在执行上述建议后仍意外变暗，则您可能正在处理与软件相关的问题，需要进一步排除故障。

停止让你的 iPhone 过热

您^(Did)是否知道，如果您的 iPhone 过热，操作系统往往会调暗或关闭显示屏以冷却设备？您可以采取以下措施来避免温度升高：

• 避免^(Avoid)让智能手机紧张的持续活动，例如视频游戏。
• 为非必要应用 禁用后台应用刷新。^{(Background App Refresh)}
• 使用更薄的手机壳。
• 尽量减少^(Minimize)在炎热环境中的使用。

了解iPhone 过热的其他原因^{(other reasons why your iPhone overheats)}。

重启你的 iPhone

快速重启您的 iPhone^{(restarting your iPhone)}或iPad可以消除许多导致 iPhone 自动变暗和过热问题的错误和故障。

因此，请转到Settings > General > Shutdown”，然后关闭 iPhone，然后按住电源^(Power)按钮 30 秒，直到设备重新启动。

更新你的 iPhone

主要系统软件版本的早期迭代（例如 iOS 16.0）往往存在大量导致 iPhone 出现问题的错误。

除了降级 iOS^{(downgrading iOS)}之外，修复它们的唯一方法是在更新的 iOS 版本可用时立即安装它们。Visit Settings > General > Software Update，然后点击下载^(Download)并安装^(Install)以更新您的 iPhone。

将 iPhone 设置恢复为默认值

iPhone 上的亮度设置冲突或损坏是各种与显示相关的异常现象背后的另一个（尽管很少见）原因。转到Settings > General > Transfer或重置^(Reset)iPhone > Reset > Reset All Settings以执行设置重置并检查是否有区别。

重新安装 iPhone 的系统软件^{(System Software)}

如果上述修复均无济于事，则该清洁安装 iPhone 的系统软件了^{(clean-install the iPhone’s system software)}。为此，请执行离线或 iCloud 备份^{(perform an offline or iCloud backup)}，然后前往Settings > General > Transfer或重置^(Reset)iPhone > Erase All Content和设置^(Settings)。

把你的 iPhone 带到 Apple

如果您的 iPhone 显示屏仍然变暗，则问题可能是硬件问题。预订 Genius Bar 天才吧^{(Make a Genius Bar reservation)}，让 Apple Genius 天才^(Genius)试一试。但是，在您这样做之前，您可能会通过在DFU（设备固件更新）模式下^{(DFU (Device Firmware Update) Mode)}安装 iPhone 的设备固件和软件来自己解决问题。

Why Your iPhone Display Keeps Dimming (And How to Fix)

Does the display on your iPhone or iPad dіm randomlу? We’ll show you why that happens and what you сan do to fix screen dimming issues on iOS and iPadOS devіces.

The display on an iPhone can keep dimming for several reasons. For example, it could be due to the built-in Auto-Brightness feature in iOS or a power management setting like Auto-Lock and Low Power Mode. Here are all possible ways why the iPhone display dims and how to stop that from happening.

Turn Off Auto-Brightness

By default, your iPhone uses an accessibility feature called Auto-Brightness to automatically adjust screen brightness based on input from the device’s ambient light sensor. However, it doesn’t always do a great job in all surroundings.

If your iPhone’s display dims too much, you can choose to disable Auto-Brightness and manage brightness levels manually. To do that:

1. Open the Settings app on your iPhone.
2. Scroll down and tap Accessibility.
3. Tap Display & Text Size.
4. Scroll down and turn off the switch next to Auto-Brightness.

1. Open your iPhone’s Control Center (swipe down from the top-right of the screen or double-click the Home button) and use the Brightness slider to increase or decrease brightness levels manually.

Extend Auto-Lock Duration

If your iPhone is on a 30-second Auto-Lock duration, the screen may appear to dim after what seems to be an annoyingly short time. To increase it:

1. Open Settings.
2. Scroll down and tap Display & Brightness.
3. Tap Auto-Lock and pick a duration of at least 1 minute or more.

Note: Avoid the larger time frames since they can adversely impact the iPhone’s battery life.

Disable Low Power Mode

Low Power Mode is an optional power management feature you can activate once your iPhone’s battery levels go below 20 percent. It curtails activities like email fetch and background refresh, dims the iPhone’s screen, and reverts the Auto-Lock duration to 30 seconds.

iOS automatically disables Low Power Mode once your iPhone recharges to at least 80 percent. However, you can turn it off whenever you want.

1. Open the Settings app on your iPhone.
2. Scroll down and tap Battery.
3. Turn off the switch next to Low Power Mode.

Disable Attention Awareness

If you use an iPhone X or any other Face ID-supported iOS device, a functionality called Attention Aware automatically dims your iPhone’s screen when you aren’t looking at it. If that annoys you:

1. Open the Settings app on your iPhone.
2. Scroll down and tap Face ID & Passcode.
3. Authenticate yourself with your iPhone’s device passcode and turn off the switch next to Attention Aware Features.

Note: Turning off Attention Aware will also disable several other useful features like auto-expanding notifications and low-volume alerts.

Turn Off True Tone

If you use an iPhone 8 or a newer iOS device, a feature called True Tone will auto-adjust the display color and intensity to match the environmental lighting conditions. However, it can give off an odd dimming or shimmering effect that bothers some people. If you want to disable True Tone:

1. Open the Settings app on your iPhone.
2. Scroll down and tap Display & Brightness.
3. Turn off the switch next to True Tone.

Disable Night Shift Feature

Another built-in iPhone feature, Night Shift, reduces blue light by warming the iPhone’s color temperature. However, it achieves that at the cost of reduced screen brightness. To disable Night Shift:

1. Open your iPhone’s Control Center.
2. Long-press the Brightness slider.
3. Disable the Night Shift icon.

If you want to configure how Night Shift works:

1. Open the Settings app on your iPhone and tap Display & Brightness.
2. Tap Night Shift.
3. Change the Night Shift schedule or adjust the color temperature. The less warm it’s set to, the brighter your iPhone will appear despite having the feature active.

Disable Reduce White Point

Your iPhone’s accessibility settings include an option capable of reducing the intensity of white colors. If your iPhone screen brightness appears too dim, check if the feature is active and disable it. To do that:

1. Open the Settings app on your iPhone.
2. Go to Accessibility > Display & Text Size.
3. Scroll down and turn off the switch next to Reduce White Point.

iPhone Screen Keeps Dimming? Continue With These Fixes

If your iPhone’s display brightness keeps dimming unexpectedly despite going through the suggestions above, you might be dealing with a software-related problem that warrants further troubleshooting.

Stop Overheating Your iPhone

Did you know that if your iPhone overheats, the operating system tends to dim or shut down the display to cool down the device? Here’s what you can do to avoid ramping up the temperature:

• Avoid continuous activity that strains the smartphone—e.g., video games.
• Disable Background App Refresh for non-essential apps.
• Use a slimmer phone case.
• Minimize usage in hot environments.

Learn about other reasons why your iPhone overheats.

Restart Your iPhone

Quickly restarting your iPhone or iPad eliminates lots of bugs and glitches causing auto-dimming and overheating issues on the iPhone.

So, go to Settings > General > Shutdown, turn off your iPhone next, and hold the Power button for 30 seconds until the device reboots.

Update Your iPhone

Early iterations of major system software releases—e.g., iOS 16.0—tend to have loads of bugs that cause problems on the iPhone.

The only way to fix them—aside from downgrading iOS—is to install newer iOS releases as soon as they become available. Visit Settings > General > Software Update and tap Download and Install to update your iPhone.

Restore iPhone Settings to Defaults

Conflicting or broken brightness settings on your iPhone is another—albeit rare—reason behind various display-related anomalies. Head over to Settings > General > Transfer or Reset iPhone > Reset > Reset All Settings to perform a settings reset and check if that makes a difference.

Reinstall Your iPhone’s System Software

If none of the fixes above help, it’s time to clean-install the iPhone’s system software. To do that, perform an offline or iCloud backup and go to Settings > General > Transfer or Reset iPhone > Erase All Content and Settings.

Take Your iPhone to Apple

If your iPhone’s display still dims, the problem could likely be a hardware issue. Make a Genius Bar reservation and have an Apple Genius take a crack at it. However, before you do that, you might have a shot at fixing the problem yourself by installing the iPhone’s device firmware and software in DFU (Device Firmware Update) Mode.

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