Between the C5 OLED 77 and QM751 Mini LED 65, the C5 OLED 77 comes out ahead in refresh rate and screen size, while the QM751 Mini LED 65 wins on peak brightness and smart os. Overall, the C5 OLED 77 scores 66.9 and the QM751 Mini LED 65 scores 69.5 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (66.9 vs 69.5). The decision isn't about overall quality — both clear the bar — it's about which specific trade-offs fit your use.
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. The biggest gaps in its favor are refresh rate, screen size, hdmi 2.1 ports, among others.
Pick the QM751 Mini LED 65 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 peak brightness, smart os.
Both ship with comparable dolby vision, vrr, so those specs don't separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity tells you both are well-rounded; the differences are about trade-offs, not quality.
Why LG - C5 OLED 77 wins
- ▲Refresh rate — 20.00% more. 144 Hz vs 120 Hz.
- ▲Screen size — 18.46% more. 77 " vs 65 ".
- ▲HDMI 2.1 ports — 2.00 more. 4 vs 2.
- ▲Panel type: OLED (vs Mini-LED).
Why TCL - QM751 Mini LED 65 wins
- ▲Peak brightness — 130.77% more. 3000 nits vs 1300 nits.
- ▲Smart OS: Google TV (vs webOS).
Spec comparison
Display
| Spec | LG - C5 OLED 77 | TCL - QM751 Mini LED 65 |
|---|---|---|
| Screen sizeⓘ | 77 "lead | 65 " |
| Panel typeⓘ | OLEDlead | Mini-LED |
| Resolutionⓘ | 4K | 4K |
| Refresh rateⓘ | 144 Hzlead | 120 Hz |
| Peak brightnessⓘ | 1300 nits | 3000 nitslead |
HDR & Smart
| Spec | LG - C5 OLED 77 | TCL - QM751 Mini LED 65 |
|---|---|---|
| Dolby Visionⓘ | true | true |
| HDR10+ⓘ | false | truelead |
| Smart OS | webOS | Google TVlead |
| Dolby Atmosⓘ | true | true |
Gaming
| Spec | LG - C5 OLED 77 | TCL - QM751 Mini LED 65 |
|---|---|---|
| HDMI 2.1 portsⓘ | 4lead | 2 |
| VRRⓘ | true | true |
| ALLM | true | true |
Frequently asked
Which is brighter, C5 OLED 77 or QM751 Mini LED 65?+
QM751 Mini LED 65 peaks at 3000 nits vs 1300 nits.
Which is better for gaming, C5 OLED 77 or QM751 Mini LED 65?+
C5 OLED 77 offers 144Hz refresh and 4 HDMI 2.1 ports.
Does C5 OLED 77 or QM751 Mini LED 65 support Dolby Vision?+
Both support Dolby Vision.
Spec-level deep dives
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