The TCL 6 Series/R646 2021 QLED is a mid-range 4k TV with Mini LED backlighting released in 2021. It sits alongside the TCL 6 Series/R655 2022 QLED as part of the 6 Series lineup, with one of the differences being that the R646 has Google TV while the R655 uses Roku TV. It's a feature-rich TV with advanced gaming features like variable refresh rate (VRR) support and two HDMI 2.1 bandwidth inputs, and it's designed to take full advantage of the Xbox Series X and PS5.
Our Verdict
The TCL R646 is excellent for most uses. It's impressive for watching movies in a dark room thanks to its fantastic contrast ratio, and it has a Mini LED local dimming feature to improve dynamic range. It's great for watching TV shows or sports in a bright room because it has fantastic peak brightness and excellent reflection handling, but it has narrow viewing angles. It's also an impressive TV for gaming thanks its variable refresh rate support, HDMI 2.1 bandwidth for 4k @ 120Hz gaming, and low input lag. Lastly, it's impressive for watching HDR content because it displays a wide color gamut and gets bright enough to make highlights pop.
- Fantastic contrast for deep blacks.
- Good black uniformity with minimal blooming.
- Automatically removes 24p judder from any source.
- High peak brightness in SDR and HDR.
- Excellent reflection handling, so glare isn't distracting.
- HDMI 2.1 bandwidth on two inputs.
- Some black smearing with fast-moving content.
The TCL R646 is great for watching TV shows in bright rooms. It gets bright enough to fight glare and has excellent reflection handling, so glare isn't distracting even if you're in a bright room. The Google TV smart interface has a ton of apps available to download. Sadly, it has a narrow viewing angle, so it's not ideal for a wide seating arrangement, or if you like to move around with the TV on, as the image degrades from the sides.
- Good black uniformity with minimal blooming.
- Automatically removes 24p judder from any source.
- No problem displaying 720p, 1080, or 4k content.
- High peak brightness in SDR and HDR.
- Excellent reflection handling, so glare isn't distracting.
- Narrow viewing angle.
The TCL R646 is great for watching sports in a well-lit environment. Thanks to its excellent reflection handling and fantastic peak brightness, visibility isn't an issue even in the brightest of rooms. It has a great response time, so fast action scenes are clear and it's easy to see what's going on. Unfortunately, it's not a good choice for watching sports with a large group of friends because it has a narrow viewing angle, so only the people sitting directly in front of the TV will enjoy the best image.
- Good black uniformity with minimal blooming.
- Automatically removes 24p judder from any source.
- No problem displaying 720p, 1080, or 4k content.
- High peak brightness in SDR and HDR.
- Excellent reflection handling, so glare isn't distracting.
- Narrow viewing angle.
- Some black smearing with fast-moving content.
The TCL R646 is excellent for gaming. It has a 120Hz panel with HDMI 2.1 bandwidth, so you can take full advantage of the PS5 and Xbox Series X. It has variable refresh rate support to reduce screen tearing, and the input lag is incredibly low, so your actions are in-sync with the action on the screen. It has a quick overall response time, but there's black smearing with fast-moving objects in dark scenes. It's excellent for dark room gaming because it has high contrast
- Fantastic contrast for deep blacks.
- Good black uniformity with minimal blooming.
- Automatically removes 24p judder from any source.
- HDMI 2.1 bandwidth on two inputs.
- Low input lag for responsive gaming.
- Variable refresh rate support.
- Some black smearing with fast-moving content.
The TCL R646 is impressive for watching HDR movies. It has a high native contrast ratio and a Mini LED backlight feature to improve the dynamic range in HDR content. It displays a wide color gamut, and it gets bright enough to make highlights pop. It supports Dolby Vision and HDR10+, so you'll enjoy the best HDR experience possible regardless of the source.
- Fantastic contrast for deep blacks.
- Good black uniformity with minimal blooming.
- Automatically removes 24p judder from any source.
- High peak brightness in SDR and HDR.
- Displays wide color gamut.
The TCL R646 is excellent for HDR gaming. It has a bunch of gaming features like HDMI 2.1 bandwidth and variable refresh rate support to reduce screen tearing. It has low input lag and a quick response time, but there's some smearing behind dark areas of the screen. HDR content looks great because it gets bright enough to make highlights pop, displays a wide color gamut, and has high contrast.
- Fantastic contrast for deep blacks.
- Good black uniformity with minimal blooming.
- Automatically removes 24p judder from any source.
- High peak brightness in SDR and HDR.
- HDMI 2.1 bandwidth on two inputs.
- Variable refresh rate support.
- Some black smearing with fast-moving content.
The TCL R646 is great to use as a PC monitor. It has a low input lag for a responsive desktop experience, and it has a quick response time, but there's some blur behind dark areas of the screen in fast motion. Glare isn't an issue in well-lit rooms because it gets bright enough to combat glare and has excellent reflection handling. It displays chroma 4:4:4 properly with 1080p and 4k signals at 60Hz, which is essential for clear text from a PC. Sadly, it has a narrow viewing angle, so the sides of the screen appear non-uniform if you're sitting up close.
- Good black uniformity with minimal blooming.
- Automatically removes 24p judder from any source.
- No problem displaying 720p, 1080, or 4k content.
- High peak brightness in SDR and HDR.
- Excellent reflection handling, so glare isn't distracting.
- HDMI 2.1 bandwidth on two inputs.
- Chroma 4:4:4 signals are displayed properly for clear text from a PC.
- Narrow viewing angle.
- Some black smearing with fast-moving content.
Changelog
- Updated Sep 26, 2025: We uploaded the latest brightness measurements and uniformity photos for the Accelerated Longevity Test.
- Updated Jul 08, 2025: We uploaded the latest brightness measurements and uniformity photos for the Accelerated Longevity Test.
- Updated Apr 17, 2025: We uploaded the latest brightness measurements and uniformity photos for the Accelerated Longevity Test.
- Updated Feb 11, 2025: We uploaded the latest brightness measurements and uniformity photos for the Accelerated Longevity Test.
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Differences Between Sizes And Variants
We bought and tested the 55-inch TCL R646, and these results are also valid for the 65-inch and 75-inch models. This model is a 4k TV with Google as its smart platform, and it's part of the 6 Series lineup that includes the TCL 6 Series/R648 2021 8k QLED and the TCL 6 Series/R635 2020 QLED both of which include Roku TV.
| Size | US Model | Canada Model |
|---|---|---|
| 55" | 55R646 | 55R646-CA |
| 65" | 65R646 | 65R646-CA |
| 75" | 75R646 | 75R646-CA |
The unit we bought was manufactured in July 2021. You can see the full label for our unit here.
Popular TV Comparisons
The TCL R646 is a great 4k TV with quantum dot technology and Mini LED backlighting that doesn't cost as much as Samsung TVs with those features. The inclusion of Google TV is a nice addition for those who aren't a fan of Roku, and it has a great selection of gaming features.
Also see our recommendations for the best smart TVs, the best TVs for Xbox Series X, and the best TVs for movies.
The TCL R635 and the TCL 6 Series/R646 2021 QLED sit alongside each other in the TCL 6 Series lineup. The R646 was released a year after the R635, so it improves in a few areas. The main difference is that the R646 has much better local dimming as there's less blooming around bright objects, but it doesn't deliver as deep blacks with local dimming enabled. The R646 also has two HDMI 2.1 inputs, which the R635 doesn't have, meaning you can use it for 4k gaming up to 120 fps. They each have different smart systems, with the R646 using Google TV and the R635 using Roku.
The LG C1 OLED is much better than the TCL 6 Series/R646 2021 QLED. The LG has a near-infinite contrast ratio, resulting in deep inky blacks in a dark room with no distracting blooming around bright objects. The LG also has much better motion handling than the TCL because it has a near-instantaneous response time. The TCL gets a lot brighter in SDR, meaning it can handle more glare. However, it has worse picture quality overall.
The TCL 6 Series/R646 2021 QLED and the Hisense U9DG each have their own strengths and weaknesses, so the best one for you depends on your usage. The TCL has much better motion handling and lower input lag, so it's better for gaming or watching sports. The Hisense has much better contrast and better local dimming, so it's a better choice for watching movies in a dark room.
The TCL 6 Series/R646 2021 QLED is much better than the LG QNED80 2022. The TCL delivers significantly better picture quality thanks to its higher contrast, better local dimming, and improved black uniformity. It also gets brighter than the LG, meaning it's the better choice for watching content in well-lit rooms and makes highlights pop more in HDR.
We buy and test dozens of TVs yearly, taking an objective, data-driven approach to deliver results you can trust. Our testing process is complex, with hundreds of individual tests that take over a week to complete. Most of our tests use specially designed test patterns that mimic real content, but we also use the same sources you have at home to ensure our results match the real-world experience. We use two main tools for our testing: a Colorimetry Research CR-100 colorimeter and a CR-250 spectroradiometer.
Test Results
Older Test Bench: This product has been tested using an older TV test methodology, before a major update. Some of the test results below aren't directly comparable with other TVs. Learn more
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