# My OLED TV screen suddenly gets brighter or darker

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**IMPORTANT: This article applies only to specific products and/or operating systems. Check _Applicable Products and Categories_ for details.**

If your TV screen brightness suddenly changes, check the following:

- Check the **Auto luminance level**, **Ambient light sensor**, **Light and Color sensor,** or **Light sensor** settings. If the sensor setting is **On**, the brightness of the TV screen changes to match the ambient lighting.

Check the following:

1. Open the **Settings** screen.

- If the remote control has a **Quick Settings** button, press the **Quick Settings** button and select **Settings**.
    - If the remote control does not have a **Quick Settings** button, press the **HOME** button and select **Settings**.
    - This step will depend on your TV menu options:
      - Select **Display & Sound** → **Ambient Optimisation Pro** → **Auto adjust according to ambient light** → **Advanced settings** → **Auto luminance level**.
      - Select **Display & Sound** → **Picture** → **Ambient light sensor or Light sensor** → **Auto luminance level**.
      - Select **Display & Sound** → **Picture** → **Light and Color sensor** → **Brightness**.
      - Select **Display & Sound** → **Picture** → **Light sensor**.
      - Select **Display** → **Picture** → **Light sensor**.

**Notes:** **Light sensor** or **Ambient light sensor** is located around the center of the bottom part of the TV screen.
- Change the channel or the input source to see if the brightness returns to normal. When an image is displayed on the screen that may easily cause [image retention](/content/electronics/support/televisions-projectors-oled-tvs-android-/articles/00173479?category=televisions-projectors-oled-tvs-android-/index.html), the brightness gradually reduces to protect the TV from image retention. The brightness returns to normal if you change the screen or perform another action that eliminates the risks of image retention.

**Note:** This function activates frequently because the HOME screen and the top screen apps contain bright still images.

1. Open the **Settings** screen.

- If the remote control has a **Quick Settings** button, press the **Quick Settings** button and select **Settings**.
    - If the remote control does not have a **Quick Settings** button, press the **HOME** button and select **Settings**.
2. This step will depend on your TV menu options:
    - Select **Display & Sound** → **Picture & Sound** → **Picture** → **Brightness** → **Peak luminance** → **Medium or Low**.
    - Select **Display & Sound** → **Picture** → **Brightness** → **Peak luminance** → **Medium or Low**.
    - Select **Display & Sound** → **Picture** → **Advanced settings** → **Brightness** → **Peak luminance** → **Medium or Low.**
    - Select **Display** → **Picture** → **Advanced settings** → **Brightness** → **Peak Luminance** → **Medium or Low**.
- **Notes:** With screens such as the **HOME** screen and the app's top screen that contain many bright still images, this function will especially frequently operate.