LG C4 (OLED65C4) 4K OLED TV Review

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The LG C4 stands out as the pinnacle of the OLED TV series, positioned above the B4 and below the Gallery Series G4. In prior iterations, the C and G series shared similarities in panel and processing, differing mainly in aesthetics. However, recent developments have distinguished the G-series with an advanced MLA OLED panel, ushering in a new era of differentiation between the two product lines.

The C4 closely resembles its predecessor, the C3 model from last year, with only minor specification adjustments and a subtle alteration in the panel’s rear surface material. While there’s no significant leap in performance, the C4 represents an evolutionary step for the mid-level OLED model.

Available in screen sizes ranging from 42 to 83 inches, the C4 maintains consistent features across its range. While the smaller 42 and 48-inch variants exhibit slightly dimmer brightness due to pixel pitch, reports suggest improved brightness compared to last year’s C3 models in the same size range, a detail we’ll scrutinize thoroughly in our forthcoming review.


Improvements in OLED technology, particularly with Micro Lens Array (MLA) and META Technology, promise enhanced brightness, color gamut, and energy efficiency in displays, offering consumers a superior viewing experience.


  • OLED panel energy efficiency is traditionally poor, with only 20% of the emitted light reaching the viewer.
  • Micro Lens Array (MLA) technology improves light outcoupling efficiency by introducing tiny lenses per pixel, redirecting light towards the viewer, and enhancing brightness and efficiency.
  • META Technology’s META Booster algorithm optimizes brightness adjustments in each scene, improves image quality, reduces image retention, and enhances energy efficiency by intelligently distributing power to pixel groups.
  • Improvements from MLA and META technology result in better specular highlights, a wider color gamut, and potentially better energy ratings for OLED displays.

The C4 is almost identical to last year’s C3 model, with just a few specification tweaks and a slightly different surface material to the rear of the panel. There is no significant step up in performance; it is an evolution of the mid-level OLED model.

The C4 is available in 42, 48, 55, 65, 77, and 83-inch screen sizes, with similar features throughout the range. Brightness is slightly dimmer on the small 42 and 48-inch screen sizes due to pixel pitch, but they are reported to be brighter this year compared to the C3 small sizes. We will test this fully when we get one in for review.

The C4 features all relevant HDR formats, including HDR10, HLG (Hybrid Log-Gamma), Dolby Vision, and Dolby Vision IQ with Precision Detail technology. There is no support for HDR10+, but given the lack of content that is available in that format, I don’t see that as an issue.

Also new for 2024 is the ability to use Filmmaker Mode with Dolby Vision content, which means you get a picture preset that plays back Dolby Vision without any unnecessary processing being applied and see the content as it was intended.

New for 2024 is the ability to use Filmmaker Mode with Dolby Vision content

The updates to the α9 AI Processor 4K Gen 7 chip promise to push more peak brightness from the C4 up to 1000 nits in Filmmaker Mode and getting close to 200 nits full screen. You can check our measured results below in that regard. Plus, there have been slight tweaks to colour brightness and improvements in reducing gradation and posterization.

Plus, Filmmaker HDR has Dynamic Tone Mapping switched off as default, which is welcome for those looking for image purity to the creator’s intent. We also see the Professional setting from the recently tested G4 available here within the Dynamic Tone Mapping menu, which allows the setting of clip points for 1000, 4000 and 10,000 nit HDR masters, allowing a hard clip or roll-off to be dialled in directly within the menus.

We also have full calibration controls on offer with advanced auto-calibration available through CalMAN software, and LG is still the only manufacturer that allows such advanced use of 1D and 3D LUT uploading directly to the TV, which makes them very popular as client monitors within Hollywood for professional studios, and the C4 continues to provide that accuracy and flexibility.

The C4 is equipped with four full-bandwidth HDMI 2.1 (48Gbps) connections with support for HDR 4K/144Hz and 4K/120Hz, including Dolby Vision HDR, NVIDIA G-Sync, AMD FreeSync Premium, and VRR, as well as the Game Optimizer and dashboard, giving gamers complete control of their gaming experience with the C4. We measured the input lag at an incredibly low 9.2ms with 4K/60 signals and 4.7ms with a 120 signal.

As the C4 is a 2024 model, it gets the WebOS 24 OS and Smart TV system, which is now part of the LG Re:New system, which will see the company offer OS upgrades for its new smart TVs for the next five years.

WebOS 24 has had some small updates to the design of the two main home pages. The Quick Cards are redesigned to be much smaller boxes, but with nice pastel colours and readable typeface that make them stand out.

Like the G4, the new accessibility card houses many of the features that first-time users or those requiring better accessibility options can explore. The one that stands out for me here is the Chatbot. This neat solution walks users through picture quality and other settings, making it simple to understand how to use the menu and setting systems, which many mass-market consumers struggle with. I’d like to see LG move this feature further forward and make it more visible on the main home page.

Also, like the recently reviewed LG G4, an item I don’t like is the waste of space in the top third of the WebOS 24 homepage that is used for advertising. You can switch this off in the main menu system or opt out during the initial setup, but it does leave an uninteresting image in the top area of the page that serves no real use. My suggested solution is to replace this image with an active real-time video window with suggested content or something similar, as you highlight apps and features. This, to me, would solve the problem of wasted real estate. I also want to encourage LG to change the advertising opt-out to an opt-in approach. Why should someone who has paid a large sum of money for their OLED TV then have to disable and opt out of advertisements on that TV?

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