4 Surprising Features of HDMI Ports You Might Not Know

If you’ve invested in a mid-tier or high-end 4K television in the recent past, it’s likely that your HDMI ports offer capabilities that extend beyond simple image display. Modern televisions come equipped with a variety of hidden features tailored to enhance gaming, sports viewing, and movie presentation. However, many of these features are not easily accessible, embedded within settings menus or activated only under specific HDMI configurations. If you’re unaware of these functionalities, you might be missing out on benefits for which you’ve already paid. Your HDMI system can elevate your TV’s visual performance and deliver seamless motion alongside cinematic audio quality.

The type of HDMI cables used also plays a significant role. Should you have adjusted all your settings and still find performance lacking, it may be worthwhile to assess your cables. Most televisions do not come with cables included, and older ones could restrict advanced features. If your HDMI cable predates your television, consider upgrading to a “Premium High Speed” cable for standard 4K displays or “Ultra High Speed” for utilizing newer features, such as 4K at 120Hz, advanced HDR, or next-gen gaming consoles.

While this article focuses primarily on television setups, many of these HDMI attributes are also applicable to PCs, gaming consoles, and streaming devices. For instance, HDMI ports on computers can support elevated refresh rates, HDR, and multi-channel audio just like televisions, provided that all components—the port, cable, and display—are compatible with the specific features.

When streaming content from devices like gaming consoles, streaming boxes, and Blu-ray players, they connect through HDMI ports, and the quality is influenced by the specific port and its settings. To ensure optimal picture quality, many televisions require users to modify HDMI settings. Most brands feature enhanced settings, which are frequently turned off by default. By enabling these settings, you unlock the HDMI port’s full potential, allowing your television to receive higher-quality signals. These optional enhanced settings exist to maintain compatibility with older devices, yet if your source device supports them, enabling them is recommended.

Different brands have distinct names for these enhanced settings. For instance, Sony TVs provide enhanced format options such as Enhanced Format (Dolby Vision) and Enhanced Format (8K), accessible under the HDMI signal format in Settings. If you have an LG television, navigate to the general menu and select HDMI Ultra HD Deep Color. For Hisense TVs, go to Channels & Inputs in the settings and pick Enhanced Format for your HDMI preference. If you own another brand, consult the menu for similar options or check the user manual for guidance.

If you engage in gaming on a console or PC, you may have encountered “Game Mode.” This setting minimizes input lag—the delay between a button press and on-screen action. However, many are unaware that modern HDMI ports can enable this mode automatically.

This function, known as Auto Low Latency Mode (ALLM), was introduced with HDMI version 2.1. When connected to a compatible console, such as a PlayStation or Xbox, the television detects the signal and automatically transitions to low-latency picture settings. Upon stopping gaming and switching to other media, like a movie or streaming service, the TV reverts to its standard settings automatically.

This feature significantly enhances the gaming experience, making controls feel more responsive and allowing for smoother gameplay. Therefore, it’s recommended to connect your console to the HDMI 2.1 port on your TV. Many contemporary TVs have ALLM enabled by default when a gaming console is connected. If manual activation is required during initial setup, look for options like “Instant Game Response” or “Game Optimizer” in the settings.

One of the often-overlooked advantages of contemporary HDMI ports is their capability to support higher refresh rates and dynamic frame syncing, which are integral to the HDMI 2.1 specifications. Features like 4K at 120Hz and Variable Refresh Rate (VRR), allow for a more fluid visual experience. A higher refresh rate results in more frames rendered per second, delivering smoother transitions that are particularly evident during fast-paced action. Whether you’re watching sports or playing games, this can reduce motion blur and enhance clarity when the camera pans.

VRR enhances this experience further by aligning the TV’s refresh rate with the output of the gaming console or PC, effectively minimizing screen tearing and stuttering for a more stable viewing experience. This ensures that fast-moving images are clear and seamless rather than jarring. Many modern gaming consoles and PCs are already compatible with these advancements, but your TV’s HDMI port must support them as well. Thus, using the HDMI 2.1 port for your console is essential for maximizing these features.

While HDMI is primarily recognized for transmitting video to a television, specific HDMI ports can also transmit high-fidelity audio back out, known as eARC or enhanced Audio Return Channel. This functionality enables your TV to send full-quality audio from built-in applications or external devices directly to a soundbar or AV receiver through a single HDMI cable.

Without eARC, you may be constrained to using compressed audio formats or may require additional cables to achieve superior sound quality. The earlier incarnation, ARC, was limited to basic surround sound capabilities. In contrast, eARC eliminates these restrictions, allowing for the uncompressed passage of full-quality audio formats like Dolby TrueHD. While many TVs and soundbars support eARC, users often overlook the importance of connecting their devices to the designated HDMI eARC port on the TV. Connecting to an incorrect input can hinder the audio quality you could otherwise enjoy from your equipment.