When connecting a computer or laptop to a monitor or TV via HDMI, you may encounter that the image quality has deteriorated in one way or another - as if faded colors, fuzzy fonts and general blurry images, strange twitches, lack of smoothness of the OS interface and others.
This manual details what can cause a bad HDMI image and what actions can be taken in each case. The situation where the fault is the video card driver is not considered, I assume that you downloaded and installed the latest official driver manually (note that the message from the device manager that the driver does not need to be updated does not mean that you have the correct driver installed) . See also: How to connect a laptop to a TV , No sound via HDMI .
Faded, faded colors when connected via HDMI
The first, very common and easily corrected situation: after connecting the monitor to a computer or laptop using an HDMI cable, all colors become pale and unsaturated.
The reason for this is that most video cards set a limited sampling range (dynamic range) when a new HDMI screen is connected. In order to change this, follow these steps:
- Right-click in an empty area of the desktop and select the utility item of your video card to adjust the image, for example: “NVIDIA Control Panel”, “Intel Graphics Settings”, “Radeon Settings”.
- In the properties of the connected displays, find the items responsible for the color settings. For example, in the NVIDIA control panel, this item will be in Display - Change resolution - Apply the following settings - Use the NVIDIA color settings. In the item "Output dynamic range" should be set to "Full".
- In the Intel HD Graphics control panel, the same thing is in the "Basic Settings" section in the "Sample Range".
- In the AMD Radeon settings, the setting is in the display properties, where you need to select "Advanced settings" - "Pixel format" - RGB 4: 4: 4 format (Full RGB).
Also pay attention to the following points:
- If you use a TV connected via HDMI instead of a monitor, then turning on the YCbCr 4: 4: 4 color format can give a better result.
- If any adapter or converter is used, i.e. If the connection is not HDMI-HDMI, then such a setting may not appear in the list.
Fuzzy fonts, blurry image
There are several possible causes for blurry images when outputting via HDMI and other interfaces.
The main reason for the fuzzy image on the monitor, regardless of the type of connection, is not the resolution that the screen has physically installed. Often, when acquiring a monitor or laptop with a high-resolution screen, users, so that everything does not seem small, change the resolution: everything becomes larger, but blurry. The solution for this situation:
- Choose the screen resolution that your monitor or TV has physically. Usually, it is automatically determined and indicated in the Recommended item, otherwise you can familiarize yourself with the monitor specifications on the Internet. See How to change the screen resolution in Windows 10 .
- If you installed an old OS without scaling support on a laptop with a high screen resolution and the only way to achieve an acceptable size of the system elements is to reduce the resolution, I can’t help here. Fonts will be blurry. The solution is to use Windows 10, in the latest versions with scaling, everything is relatively good.
- Keep in mind that even when the resolution changes multiple times: for example, you install Full HD on a 4k monitor, blur will also be present (though not so noticeably).
If the resolution is set correctly, not a monitor is used, but a TV, but the fonts are still blurry, check out the separate instruction How to fix blurry Windows 10 fonts (some solutions apply to previous versions of the OS).
In a situation where you encounter blurriness after connecting a PC or laptop to the TV as a monitor, while not sitting close to it, carefully study the TV settings: often the included “image enhancement” functions implemented on the TV turn out to be the reason.
Twitching mouse pointer, jerky image when connected via HDMI
If, after connecting a monitor or TV via HDMI, you notice that the system interface does not behave as smoothly as before, the matter is usually the update frequency, which can be changed in the settings.
However, it should be borne in mind that an acceptable refresh rate may not be available and this often depends not on the screen:
- For example, when connecting a laptop or PC with integrated Intel graphics to a 4k UHD display, you usually will not be able to get an update frequency of more than 30 Hz (for those adapters that are relevant at the time of writing).
- If both the video card and the monitor support a high refresh rate for HDMI, but you took the cable from the “box with wires” or bought it without paying attention to the version of HDMI (and it happens that on cheap Chinese cables for 100-200 rubles the information is incorrect) The cable bandwidth may not be enough for the desired refresh rate.
Details on how to change the refresh rate of the monitor screen , there are other reasons why it is not possible to set the desired frequency.
Other Causes of Poor HDMI Image
In conclusion, a few more points that can affect the image quality when connected using an HDMI cable (I will repeat some of those that have already been indicated so that you pay attention to them):
- Using adapters / converters, especially when outputting images from an analog output (e.g. VGA).
- Hardware features: for example, for some integrated graphics adapters still present on laptops, there are restrictions on the resolution of HDMI. Moreover, some monitors may also have resolution restrictions for individual inputs (for example, with DisplayPort everything works in full resolution, and with HDMI only in FullHD). Carefully read the specifications of both the video card and the monitor. In some cases, creating custom permissions in an application from the manufacturer of the video card works.
- Various image enhancement features. Usually, they cause distortion on the TV (especially when working with the OS and texts), but they are also present on some monitors: look at the settings.
- Bad or “wrong” standard HDMI cable. For verification, you can temporarily take such a cable from another device (usually in apartments today there are more than 1).
- “Overclocking the matrix” - setting the refresh rate of the screen is higher than that stated in the specifications of the device. Sometimes it leads to the appearance of various stripes, dots and artifacts of the image.
- It’s rare, but sometimes it makes sense to install a monitor driver, if one is available on the manufacturer’s official website (for many monitor models, these are absent and are not necessary).
- An even less common case is the need to update the monitor firmware: it is available only for some expensive models of monitors. The update process is usually started using special software from the manufacturer when the monitor is connected via USB. Before you perform, I strongly recommend that you carefully read the manufacturer's instructions on this topic.
I hope one of the proposed options will work in your situation. If you can share other cases where it was possible to fix the image quality via HDMI, I will be glad to your comment.