Between the C5 OLED 55 and C5 OLED 77, the C5 OLED 55 comes out ahead in several specs, while the C5 OLED 77 wins on screen size. Overall, the C5 OLED 55 scores 60.5 and the C5 OLED 77 scores 66.9 on our Mars Score.
Which should you buy?
The C5 OLED 77 edges ahead on the Mars Score (60.5 vs 66.9), but the 6.4-point gap is small enough that the right pick comes down to which spec advantages matter to you.
The C5 OLED 55 doesn't pull ahead on any single popular-comparison spec — its strengths sit in the spec table groups rather than the headline advantages.
Pick the C5 OLED 77 if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. Its strongest claims are screen size.
Both ship with comparable panel type, refresh rate, peak brightness, so those specs don't separate the two — focus on the differences below.
Bottom line: the C5 OLED 77 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why LG - C5 OLED 55 wins
- No decisive advantages.
Why LG - C5 OLED 77 wins
- ▲Screen size — 40.00% more. 77 " vs 55 ".
Spec comparison
Display
| Spec | LG - C5 OLED 55 | LG - C5 OLED 77 |
|---|---|---|
| Screen sizeⓘ | 55 " | 77 "lead |
| Panel typeⓘ | OLED | OLED |
| Resolutionⓘ | 4K | 4K |
| Refresh rateⓘ | 144 Hz | 144 Hz |
| Peak brightnessⓘ | 1300 nits | 1300 nits |
HDR & Smart
| Spec | LG - C5 OLED 55 | LG - C5 OLED 77 |
|---|---|---|
| Dolby Visionⓘ | true | true |
| HDR10+ⓘ | false | false |
| Smart OS | webOS | webOS |
| Dolby Atmosⓘ | true | true |
Gaming
| Spec | LG - C5 OLED 55 | LG - C5 OLED 77 |
|---|---|---|
| HDMI 2.1 portsⓘ | 4 | 4 |
| VRRⓘ | true | true |
| ALLM | true | true |
Frequently asked
Which is brighter, C5 OLED 55 or C5 OLED 77?+
C5 OLED 77 peaks at 1300 nits vs 1300 nits.
Which is better for gaming, C5 OLED 55 or C5 OLED 77?+
C5 OLED 55 offers 144Hz refresh and 4 HDMI 2.1 ports.
Does C5 OLED 55 or C5 OLED 77 support Dolby Vision?+
Both support Dolby Vision.
Spec-level deep dives
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