Is 50Hz Refresh Rate Good for TV?

With the rapid evolution of display technologies in televisions over the past decade, refresh rate has become an important specification to consider when shopping for a new TV. In this comprehensive guide, we‘ll break down the technical differences between common refresh rates and analyze whether 50Hz is sufficient for delivering a great viewing experience on modern TVs.

Defining Refresh Rate

The refresh rate refers to how many times per second a display updates the image on screen. It is measured in Hertz (Hz), with a higher number indicating more frequent image refreshes per second. A 50Hz TV refreshes the image 50 times per second, while 60Hz does so 60 times per second.

This refresh process includes drawing each new frame of video content and illuminating the TV‘s pixels accordingly. A higher refresh rate thereby allows more fluid motion and reduces perceived blurring.

Technical Impact of Refresh Rate

From a technical perspective, a higher refresh rate enables the TV to display fast motion more sharply. This is because each frame persists for a shorter duration before being updated. With 60Hz for example, each frame remains on screen for approximately 16.7 milliseconds before the next one is drawn. At 50Hz, each frame persists for 20 milliseconds.

This quicker cycling between frames provides a smoother viewing experience. Slow refresh rates can result in a flickering effect, where individual frames are more noticeable to the human eye. Higher refresh rates also allow the TV‘s pixels to respond faster to changes in content, further reducing motion blur.

50Hz vs 60Hz – Pros and Cons

While 60Hz is the standard for TVs today, 50Hz is still commonly found in regions that use a 50Hz alternating current power grid, including Europe, parts of Asia, and Australia. What are the tradeoffs between 50Hz and 60Hz displays?

Benefits of 50Hz

• Slightly higher power transmission efficiency on AC grids using 50Hz
• Adequate for most movie/TV show viewing applications
• Allows 50fps content to display at native frame rate without interpolation

Drawbacks of 50Hz

• Not as smooth as 60Hz displays, especially for fast motion
• Can cause uneven frame delivery for 60fps content like sports and modern games
• More prone to flicker and blurring in high motion scenes

The 50Hz vs 60Hz dilemma has persisted due to historic decisions in the early AC electric grid, before consideration of video applications. Adoption of 50Hz vs 60Hz is split approximately 45% to 55% globally. The map below shows regions that primarily use 50Hz or 60Hz power standards.

Insert global map showing 50Hz and 60Hz countries

With the transition to digital video, format conversions are simple to support both 50Hz and 60Hz film and video content. However, the fluidity of motion rendering remains a key factor in display quality.

50Hz for 4K TVs – The Verdict

4K televisions with HDR have pushed picture quality to new heights. But does a 50Hz refresh rate hold back the viewing experience on such displays? Let‘s examine some use cases.

4K Movies and TV Shows

Most cinema content is filmed at 24 frames per second. Modern TV shows are typically shot at 30fps or 60fps. On a 4K television, a 50Hz refresh rate is sufficient for streaming and playing back such media smoothly. The minor delay between frames is not noticeable at such frame rates.

Live Sports and Action Scenes

Fast panning shots and quick subject movement can expose the limitations of a 50Hz panel. At 50fps, rapidly changing imagery will exhibit more motion blur compared to 60Hz or higher. The difference is most apparent in live sports, especially soccer, hockey, basketball, and more. Slow-motion playback also highlights the jerky motion at 50Hz.

Similarly, intense action sequences and car chases demonstrate the fast response required during dramatic on-screen motions. Frame rates up to 60fps are vital for crystallizing such moments. At 50Hz, the panel cannot keep up with the pace resulting in a softer blurred picture.

Console Gaming

Modern game consoles like the PlayStation 5 and Xbox Series X render frames much faster than legacy systems. Support for up to 4K 120fps enables unprecedented fluidity. At 50Hz, details in fast gameplay become lost, with significant input lag. Response times suffer compared to 60Hz or better panels. Competitive online multiplayer gaming demands 60Hz or preferably 120Hz displays.

PC Gaming

PC gamers using high-end graphics cards enjoy frame rates exceeding 100fps in many titles. Display refresh rates of 100Hz, 144Hz, or even 240Hz help fully realize the output potential of such systems. For precision response and maximum detail during fast in-game motions, a 50Hz display would be unplayable for serious PC gamers.

Subjective Perception of Refresh Rate

The impact of refresh rate depends considerably on the type of content being displayed. Slower paced movies and cinematic games aren‘t affected as negatively by 50Hz compared to competitive fast-action gameplay.

Nonetheless, empirical data and user studies have shown average detection thresholds for flicker and motion blur persist well beyond 50Hz for most viewers.

In the table below, we can see that across various pieces of research, distinguishable improvements to motion clarity continue up to and beyond 100Hz depending on experimental factors. So there remains value in choosing higher refresh rates even if the extent of perceived gains diminishes eventually.

Based on both the technical and perceptual evidence, 60Hz or higher is recommended especially for larger screen sizes. While even expert viewers cannot always distinguish small refresh rate differences, higher specifications ultimately provide headroom as content frame rates continue to evolve.

Blur Reduction Backlight Strobing

Televisions and monitors are employing advanced features to improve motion clarity by strobing the backlight in coordination with pixel response. Effectively operating at 300Hz+ dimmed states, this reduces perceived blur substantially for high motion content. It demonstrates that increasing refresh rate capabilities beyond 60Hz does result in tangible gains for fast-action material.

Future-Proofing Display Refresh Rate

Broadcast standards like UHDTV are ushering in new high frame rate formats, expanding beyond 24/30fps video. On the content creation side, techniques like high frame rate filming produce remarkable clarity for action sequences at up to 120fps. Displays with higher refresh potential are best positioned to keep up with these industry changes.

Ideal Refresh Rate Recommendations

Considering the factors outlined in this guide, here are my recommendations for ideal TV refresh rates based on usage:

• Movies/TV shows: 50/60Hz is sufficient
• Live sports: 60Hz viable, 120Hz+ preferable
• Casual console gaming: 60Hz minimum
• Hardcore console gaming: 120Hz
• PC gaming: 144Hz, 244Hz for cutting edge motion clarity

While every step up in refresh rate brings tangible improvements in motion resolution, also weighs factors like available content formats, display resolution, and budget. Aim for the best possible balance of resolution, size, and refresh rate to maximize enjoyment of your new TV.

In summary, while 50Hz refresh TVs still satisfy for movie watching and casual TV usage, a higher 60Hz+ refresh rate is recommended to fully realize the stunning picture potential of modern 4K and 8K sets.